FAQs

Because the B. H. Bunn Company has been operating since 1907, and has produced over 1500 different variations after the first model, If you know the serial number, BUNN will be happy to look up the serial number and give out the information you need. The older cast-iron units the serial number is on the machines right side frame. Newer units are on the front frame. Call Bunn for more serial number information.

Benjamin was 19 years old.

Benjamin was born in Des Smet, South Dakota, when it was still a territory. He was born in an eight sided house in the year 1887.

Benjamin H. Bunn, founder

It all started from a notion back in 1906, when a Postal clerk in Chicago came home to his son and stated, we cannot keep up tying mail bundles by hand, since I am putting you thru engineering school, why not a mechanical machine, you need to built it!

No. Standard plastic strapping systems rely entirely on friction-welding or heat-melting synthetic polymers to join a flat band together. They do not possess the mechanical geometry required to loop and tie a knot. To switch to a 100% Eco-safe string format, a facility must utilize a dedicated rotary-arm twine tyer. Fortunately, because these string tying machines are engineered out of solid cast-iron, high-quality refurbished Bunn machines are widely available, cost-effective, and built to run flawlessly for decades in heavy industrial environment

Yes, BUNN was one of the first to import Polytape back in the late 1960’s. Today, why would you want to use single use plastic? Bunn offers great solutions with 100% Environment Safe materials for tying machines.

No, when fed through an industrial machine, high-tensile natural fibers are incredibly rugged. While cheap, manual single-ply garden twine snaps easily under human tension, a Bunn machine uses uniform, mechanically calibrated tensioning arm paired with industrial multi-ply twine (often boasting breaking strengths from 43 lbs up to 120+ lbs). Furthermore, Canada Post’s extensive 90-day mail stream stress testing using automated string-tying systems resulted in a 0% failure rate, proving it matches the structural integrity of synthetic plastic straps.

When the BUNN Tying Machine was invented at the turn of the century, BUNN pioneered the industry by using 100% cotton long before environmental awareness became mainstream. Throughout the 1900s, “green” was simply a color, not a marketing term. Decades ahead of its time, BUNN has always provided eco-safe automatic packaging solutions. Building on this legacy, BUNN introduced a new, 100% environmentally safe twine in 2025 called “Enviro Cellulo.” Unlike weak standard cotton twines, Enviro Cellulo is significantly stronger and performs better in BUNN Tying Machines, proving that modern sustainability does not mean sacrificing strength.

It goes back to where it came from—nature.

BUNN Enviro Cellulo Twine is made from regenerated plant-based cellulose fibers. Unlike synthetic plastic twine, it is designed to return to the natural carbon cycle rather than persist as plastic waste.

When discarded, cellulose can be broken down by naturally occurring microorganisms and fungi. Under suitable environmental conditions, the fibers decompose into naturally occurring components such as water, carbon dioxide and biomass.

Most importantly, BUNN Enviro Cellulo Twine does not contain conventional plastic fibers, so it does not leave behind the persistent microplastic residue associated with synthetic plastic materials.

That means when you choose BUNN Enviro Cellulo Twine, you’re not just securing your product—you’re choosing a tying material designed with the environment in mind.

BUNN was Green When Green Was Just a Color.

ZERO PLASTIC. BUNN KNOT. BUNN SOLUTION.

Plastic doesn’t simply disappear when you throw it away.

Polypropylene (PP) strapping is a synthetic plastic made from fossil-fuel-derived materials. Unlike cellulose-based BUNN Enviro Cellulo Twine, polypropylene does not readily biodegrade through natural biological processes.

When discarded, PP strapping can persist in the environment for a very long time. Exposure to sunlight, weather and physical forces can cause the plastic to break into progressively smaller pieces, including microplastic particles, rather than returning naturally to organic matter.

Loose plastic strapping can also create recycling and waste-handling problems because long, flexible bands can become tangled in processing and sorting equipment. While some polypropylene strapping may be recyclable through specialized programs, recycling depends on local facilities and proper collection.

The result is a fundamental difference:

PP strapping remains plastic. BUNN Enviro Cellulo Twine is made from regenerated plant-based cellulose fibers.

When your application allows you to replace plastic strapping with BUNN Enviro Cellulo Twine, you can secure your products while reducing your dependence on synthetic plastic packaging materials.

BUNN was Green When Green Was Just a Color.

ZERO PLASTIC. BUNN KNOT. BUNN SOLUTION.

The best 100% plastic-free alternative to automatic box strapping is a mechanical string tying machine, such as a classic Bunn Tying Machine. Instead of melting synthetic polypropylene or polyester ribbons, these industrial-speed machines utilize heavy-duty, 100% biodegradable twine. A string tyer matches the high-volume speed of automated strapping tools while remaining completely zero-waste, non-toxic, and free of single-use plastics.

The best 100% plastic-free alternative to automatic bundle strapping is a mechanical string tying machine, such as a classic Bunn Tying Machine. Instead of melting synthetic polypropylene or polyester bands around products, these high-speed machines utilize heavy-duty, 100% biodegradable BUNN Enviro Cellulo Twine. A mechanical string tyer matches the high-volume speed of automated strapping tools while remaining completely zero-waste and free of single-use plastics.

Plastic strapping poses a severe, long-term entanglement threat to wildlife because it retains its high tensile strength for decades when left outdoors. Animals can easily become trapped in discarded loops, leading to severe injury. Conversely, BUNN Enviro Cellulo Twine loses over 50% of its structural tensile strength within 7 to 14 days of exposure to environmental moisture and outdoor soil, entirely eliminating any long-term strangulation or entanglement risk to local ecosystems.

BUNN Twines do not melt, emit chemicals, or degrade when exposed to the extreme heat or steam coming from fresh food containers.

BUNN Model 1691 will tie bundle sizes ranging from 15.5″ Wide X 20″ length X 9.5″ Height or narrower and taller, example 12″ X 12″ X 12″ will also fit. We are bundling a square or rectangle in a circle. The 1691 will automatically adjust to the bundle size when bundling different sizes. The tension will also automatically maintain it’s setting on the different size bundles.  

     

They discover that while moisture causes adhesive tape to peel off immediately and cardboard boxes to lose structural integrity, a Bunn machine using synthetic twines like nylon, polyester type materials creates a purely mechanical knot that holds tight even when completely submerged or frozen. BUNN Tying Machines can be adapted to all sorts of twines available to special markets. Call BUNN Tech support to see if you twine could work.

The simple answer is yes!

When employees manually tie bundles all day using rubber bands, string, or other hand-applied materials, the job can require repeated gripping, stretching, twisting, and pulling with the hands and wrists.

A BUNN tying machine can automate the tying process using a foot pedal or sensor activation, reducing the amount of repetitive hand and wrist motion required from the operator.

How does BUNN help?

Instead of repeatedly hand-tying each bundle, the operator positions the bundle in the machine and activates the tying cycle.

This can help:

• Reduce repetitive gripping, twisting, and pulling
• Reduce hand and wrist fatigue
• Reduce the tedious motion associated with manual tying
• Provide a more consistent tying process
• Allow employees to use their hands for positioning and handling rather than repeatedly tying bundles

For operations that tie hundreds or thousands of bundles, eliminating repetitive hand-tying can make a significant difference in the way the work is performed.

What about carpal tunnel syndrome?

BUNN machines are not a medical treatment or a guarantee against carpal tunnel syndrome. However, replacing repetitive manual tying with machine-assisted tying can reduce the amount of repetitive hand and wrist activity involved in the job.

Every workplace is different, so employers should evaluate their specific operation with an appropriate ergonomic or safety professional.

Knottia’s tip: If your employees tie bundles by hand all day, ask yourself: Why are we still making their hands do what a machine can do?    

Yes. Bakeries, have used a Bunn Tying Machine since 1923. Because the machine relies on an adjustable slip-clutch, the tension arm applies a firm, consistent seal without compressing or denting lightweight, die-cut pastry boxes. The tensions are adjustable for the style box being used.

Yes. While people often associate string with light packaging, industrial rotary-arm twine tyers are regularly used to secure rugged loads like metal rods, tubing, and wire bundles weighing up to 50 lbs. By running a heavy-duty multi-ply BUNN Twine designed for heavy bundles or Bunn Enviro Cellulo 12ply twine, the machine achieves an immense breaking strength that easily locks heavy metal bundles into a rigid, non-slip unit.

The machine can be integrated into conveyor layouts using automated photo-eye sensor triggers instead of foot activated.

With over 1500 different variations we have built, it is best to call us at 800-222-BUNN with your serial number (s) to ensure proper parts are ordered for your machine.

Yes, BUNN still carries part for machine built over 80 years ago! BUNN designed their machines to last and have interchangeability for great customer service. BUNN also offers repairs to older parts when available.

All BUNN Tying Machines are use 110V, single phase power requirements. You can order 220-230V, single phase or 3phase depending on your needs.

BUNN first developed a Rolled Roast Tyer (Meat Tyer) in 1955 for the butcher shop. Today, our new model STM’S can tie Rolled Meats, Rolled/stuffed Meats, Rolled/Stuffed Fish, Rotisserie Chicken. At 58 cycles per minute, no human can keep up!  

Yes, we can go a deep as 24″ from the line of twine.

BUNN has been shipping international since the 1920’s following the standard international rules for crating. BUNN Twines unlike wooden crates or pallets which require certified ISPM-15 heat treatments to travel globally, cotton-twine bundling via a Bunn machine requires zero international customs certifications or agricultural heat processing.

BUNN has exported since 1923 to companies all over the world.

A mechanical string tyer easily matches or exceeds the cycle times of semi-automatic plastic strapping machines. A standard Bunn Package Tying Machine can automatically wrap a bundle, pull calibrated tension, tie an unslipable double-loop knot, and cut the line in less than 1.5 seconds. This high-speed mechanical cycle allows operators to process thousands of commercial print stacks, mail bundles, or shipping boxes per hour without the operator slowdowns associated with manual hand-tying.

There are approximately 15 basic models to choose from. Although, BUNN has built over 1500 different variations to meet customers needs. BUNN is still developing new models today for new applications. Call and tell us your application today, we should have one that fits your needs.

Q: How should I measure my products for a bundling quote?
A: Please measure your packages and enter the dimensions using the format: Width x Length x Height. To help us find the perfect match, list your bundle sizes in order from the smallest to the largest.

In many high-volume applications, tying can be an exceptionally economical way to secure a bundle.

When you compare packaging costs, don’t look only at the price of the material. Look at how much material you actually use per bundle, labor, equipment, maintenance, and waste.

BUNN tying machines use a relatively small amount of twine to securely bundle products. Depending on the application and twine configuration, high-volume tying can use less than 0.1¢ of twine per linear foot.

Compared with plastic wrap, plastic strapping, or heavy banding materials, the amount of material required for a BUNN tie can be significantly lower.

BUNN Twine is available in many sizes and strengths

Not every application requires the same twine.

BUNN offers different twine sizes and strengths to match the product being tied, from lightweight bundles to demanding industrial applications.

The objective is simple: use the right twine for the job without using more material than necessary.

And there’s another advantage: no plastic

BUNN Twine provides an alternative to many plastic-based bundling methods.

BUNN Twine is 100% Environment Safe, providing businesses with an opportunity to reduce their reliance on single-use plastic packaging.

Want to know what your operation could save?

The best way to find out is to compare your current cost per bundle against the cost of tying with a BUNN machine.

Consider:

• Packaging material
• Labor
• Equipment
• Maintenance
• Waste
• Production speed
• Plastic reduction

Knottia’s tip: Don’t ask only, “What does the material cost?” Ask, “What does it cost me to tie every bundle?” Call BUNN and let us help you compare the numbers.

A: We select your model based on your package material, your required wrap type, and your exact bundle dimensions. BUNN offers diverse configurations—from the compact BUNN 1091 up to large industrial Pass Through String Tying Machines. Please provide your dimensions in a Width x Length x Height format, ordered from smallest to largest, so our team can recommend the right throat depth and arm size.

BUNN Spring Kits are designed to keep your machine running at it’s peak performance by including all tying head springs, running tension spring, trip springs and a tube of 10 blades. We will need your serial number and twine size to provide the proper kit when you call. Each kit is individually packaged and labeled with parts numbers and quantity required. We recommend you to print a copy of the manual to layout the appropriate spring for locations if you are not familiar with each spring location.

Line of Twine is the spacing between the inner table and front table on a BUNN Tying Machine. This is where the twine is wrapped around the bundle and tightly tied. From the line of twine to the inner back wall of the back table is the Depth-of-Throat.

Where do we begin, Let’s see, it all started with mailing, printing, newspapers, candy boxes, bakery boxes, bundles of foam, textiles like laundry, cut goods for clothing such as shoe and boot soles, sleeves, pockets, pant legs, dresses, coats, hats, gaskets, oil filters, hydraulic filters, pen pencils, picture frames, cardboard boxes, foam, rolled meats, rotisserie chicken, electrical cords, metal products. The list keeps growing what do you need tied? Give us a call, most likely we have tied something similar or even the same.

Users ask this to understand sizing limitations. They learn that throat depth dictates the maximum distance a package can slide into the machine table before hitting back table. Standard unit have a 7″ depth -of-throat. Large units have a 12″ depth-of-throat for larger bundles.

Line supervisors search for factory cycle metrics. While standard Bunn machines can cycle up to 42 times per minute, real-world data across mailrooms and factories shows that the average operational speed is around 25 to 30 bundles per minute, as the machine generally ties faster than a human operator can feed it. Bunn’s STM Meat Tyer can cycle at 58 per minute. Depending on the operator, one can actually tie a pork lion in under 10 seconds with 10 individual ties. check out Bunn’s STM video, it’s amazing.

Standard units have a 35.5″ ergonomically correct height. The BUNN 3091 is slight lower to make it easier to handle larger bundles being tied.

Depending on the specific model, options include a single wrap one-way, double or triple wraps one-way, and double or triple cross-ties are available. BUNN just developed the new QUAD Wrap for those products that require stronger tension and weigh more than the average bundle. The Quad Wrap give that extra holding power for those harder bundles.

If it can be bundled, there’s a good chance BUNN has tied it!

BUNN tying machines are used to securely fasten an incredible range of products—from soft foam to hard metal, and from food products to mail and textiles.

BUNN machines have been used for:

• Mail & printed materials — mail bundles, newspapers, magazines, flyers and printed materials
• Boxes & packaging — corrugated boxes, bakery boxes and other packaging
• Textiles & laundry — commercial laundry, linens, towels and textile products
• Food products — rolled beef and pork, rotisserie chicken and other food products
• Produce — carrots, kale, Napa cabbage, parsley, cilantro, asparagus and more
• Industrial products — metal pieces, filters, foam products and other manufactured components
• Currency — bundles of bank notes
• Specialty products — including Madagascar vanilla beans

And that’s just the beginning.

BUNN machines can be configured with different tying patterns, machine designs and twine strengths to meet the requirements of different products and industries.

Have something unusual to bundle?

Don’t assume BUNN can’t do it. Ask us.

Send us a sample of your product and our technical team can help determine the right BUNN machine, tying configuration and twine for your application.

Knottia’s tip: You name it, We’ve Tied It!

BUNN — More than a tying machine. It’s a solution built around your product.

BUNN developed a high temperature twine for the BUNN Tying machine to withstand over 900 degrees for 20-30 minutes without melting, breaking under the stress of heat treating. Ask about our Video High Temperature Twine.

Authentic components remain available for older machines, call BUNN today.

BUNN has all the parts you need! Call BUNN or a local dealer, ask for 021009 tube of 10 blades.

Q: Which Bunn Tying Machine model do I need?
A: Bunn offers several models and variations tailored to your specific bundling needs. Our machines can secure a wide variety of items, ranging from soft foam materials to hard metal products. Please ask this question next; How should I measure my products for choosing the best machine?  

Food industry delivery managers look this up online. They learn that the unique “Bunn Knot” cannot be duplicated by hand, providing a tamper-evident security seal while simultaneously creating a convenient carrying handle. Ever try to carry several pizza boxes in the rain or slippery weather? Things kinda slide around, right? BUNN Tied pizza boxes will help keep the integrity of goodness intact.

The answer is yes; as long as the largest box fits within the throat depth and maximum height capacity, the mechanical twine arm automatically tightens and scales its grip to fit smaller items in the same line without needing any adjustments.

In Aerospace and automotive bundle applications while steel strapping or wire ties scratch or bite deeply into high-finish surfaces, Bunn’s specialized in strong but soft high strength twines to tightly secure polished or threaded metal parts without leaving a single surface scratch.

Factory BUNN Service Manuals explicitly warn against this: “Never file the face of the stringholder casting!” The groove is a precise factory design, not wear and tear, and filing it permanently ruins the machine’s tension. BUNN has replacement faces for the new modern Stringholders.

Yes, specialized conversion kits are available to modify your internal component assemblies if your packaging requirements change. We also have kits to go from Polytape to 100% Environment Safe Twines.

We can show you in the Bunn Virtual Repairman Video system area, or it is in our manuals.

We recommend basic weekly maintenance. You should clear out stray debris using compressed air, place two drops of specialized oil into the designated lubrication ports, pivot and slide areas and inspect the integrity of all springs. We can provide a basic tune-up with our Spring Kits specifically designed for best preventative maintenance for your model.

If you use the machine on average 4-5 hours per day, 5 days a week or approximately 30 hours a week, you should replace the knife blade weekly.

The Bunn Knot requires no knives or scissors, just pull both the long and short ends to remove.

Yes, catch the trailing tail before it completely exits the tension container and tie it securely to the beginning of your new cone using a tight square knot. BUNN Twine has a red pigtail as a notice you have reached the end of the cone. You can watch our treading procedure video too!

Several things will cause mis-ties.

• Poor quality twine- weak break strength, inconsistent strength
• Dual Tension adjusted too tight, pinching twine.
• Button or dual tension not compatible causing pinch point
• Button could be bent
• Running tension issue
• Missing twine cone pad causing a pinch at bottom of cone
• Needs oil
• Break out of adjustment causing twine are to pull twine out of button due to the bounce

Call BUNN for Tech support.

Check your manual, Online troubleshooting guides point users directly to the safety guards. Modern Bunn units feature an electrical disconnect switch that completely prohibits the machine from running if the mechanical safety guarding is open or missing. Call BUNN Tech support to assistance.

Bunn Manuals state that you should use standard SAE 10 non-detergent motor oil on all oil holes, cups, and pivot joints, and a light coat of multi-purpose lithium grease on the heavy main gear cam surfaces.

The answer usually points to,

• Excessive twine running tension, pulls out of Button
• Knifetrap not activating
• Dull knife blade
• Worn knifetrap pivot hole area due to dull knife
• Lack of lubrication
• Knotter Stop Stud mis-adjusted

Before replacing parts, let’s check three things: the twine path, the running tension, and the button. Most problems can be narrowed down by checking these areas in order.

1. Is the twine threaded correctly?

Start by checking the complete twine path.

Make sure the twine is going through each guide, tension point, roller, and the stringholder/button in the correct sequence. Even one missed guide or an incorrectly routed twine can change the way the machine pulls and holds the twine.

If you are unsure about the threading, check your machine’s specific threading instructions or contact BUNN with your machine serial number.

2. Is the running tension balanced with the button pressure?

The running tension and the button pressure work together to control the twine.

You don’t want one fighting the other.

If the running tension is too strong, the twine can pull excessively against the button.

If the button pressure is too strong, the twine may not release properly.

The objective is a smooth, controlled movement of the twine through the machine, with the running tension and button pressure working together.

3. Could the button be bent?

A bent button can be difficult to identify just by looking at it.

Here’s a simple way to check it:

• Remove the twine from behind the button.
• Slowly rotate the button clockwise, simulating the direction the twine pulls through the button.
• Apply light pressure first, then gradually increase the pressure.
• Pay attention to whether the button rotates smoothly.

If the button feels smooth in one part of its rotation but becomes noticeably harder or changes resistance as it rotates, the button may be bent.

4. How can I confirm that the button is bent?

Knottia’s Marker Test can help confirm the problem.

1. Properly re-string the machine.
2. Put a small reference mark on the top of the button with a marker.
3. Cycle the machine several times.
4. Watch the position of the mark after each cycle.
5. If the machine drops the twine or produces a mis-tie, note where the mark stopped.
6. Re-string the machine and repeat the test several times.

The purpose is to see whether the button consistently returns to approximately the same position during normal operation.

If the button repeatedly stops in significantly different positions, especially when the twine drops or a mis-tie occurs, the button may be bent and should be replaced.

Still having trouble?

Don’t start replacing parts by guessing.

Call BUNN with your machine’s serial number. BUNN has manufactured thousands of machine configurations and variations over the years, so the serial number helps us identify the correct replacement button and other parts for your specific machine.

Remember: Check the twine path first. Check the tension second. Test the button third.

If your BUNN machine is jamming while the knife is cutting the twine, start by checking the Knife Trap Pivot Screw.

1. Check the Knife Trap Pivot Screw

The Knife Trap Pivot Screw (100646) must be properly secured for the knife mechanism to operate correctly.

If the pivot screw is loose, the knife trap can move out of its proper operating position and cause the machine to jam during the cutting cycle.

2. If the pivot screw is loose

The Stringholder Assembly must be removed from the machine to properly secure the pivot screw.

The Knife Trap Pivot Screw uses 100144 jam nuts to hold the pivot screw securely in position during normal operation.

Important: Do not substitute Nyloc-style nuts for the 100144 jam nuts in this application. Nyloc-style nuts can loosen during operation and are not the proper hardware for this location.

3. Don’t overlook lubrication

Proper lubrication is also important.

The knife must be able to move freely through its complete operating cycle. Insufficient or improper lubrication can increase friction and interfere with the knife’s movement.

Keeping the knife mechanism properly lubricated is an important part of maintaining reliable cutting performance.

Still jamming?

If you’ve checked the Knife Trap Pivot Screw, the proper 100144 jam nuts, and lubrication, but the machine continues to jam, stop and contact BUNN Technical Support before making additional adjustments or replacing parts.

Have your machine serial number available. BUNN can help identify the correct parts and guide you through the proper procedure for your specific machine.

Knottia’s tip: The knife has one job—cut cleanly and get out of the way. If it’s jamming, check the pivot first!

Need help? Contact BUNN Technical Support.

If your BUNN machine locks up during the tying cycle, one thing to check is whether the Knotter has jumped time.

Check the Knotter Jaws

With the machine in the proper position, look at the Knotter Jaws.

The Knotter Jaws should be pointing toward the rear of the machine.

If the Knotter Jaws are not pointing toward the rear, the Knotter has most likely jumped time.

What should I do if the Knotter has jumped time?

Don’t force the machine or try to continue cycling it.

The Knotter timing needs to be reset correctly for the machine to operate properly. This is a mechanical timing adjustment, and the correct procedure can vary depending on actual location in the machine.

Please call BUNN Technical Support for instructions on how to properly reset the Knotter timing.

Have your machine serial number available when you call. This allows BUNN to identify your specific machine and provide the correct instructions. Photos are always helpful if you can provide.

Knottia’s tip: If the Knotter Jaws aren’t pointing toward the rear, don’t force it—call BUNN before you turn another cycle.

If your BUNN machine ties properly sometimes but produces occasional mis-ties, check the Knotter for leftover twine.

Check for Twine Wrapped Around the Knotter

After a mis-tie, carefully inspect the Knotter for any twine that may have wrapped around or become caught in the Knotter mechanism.

Even a small piece of leftover twine can interfere with the Knotter’s next cycle and cause another mis-tie.

What should I do after a mis-tie?

Remove ALL twine from the Knotter before running the machine again.

Don’t simply remove the loose portion you can see. Make sure there is no twine remaining around the Knotter or caught in the mechanism.

Once the Knotter is completely clear, re-string the machine properly and run another cycle.

If the machine continues to mis-tie after all leftover twine has been removed, there may be another issue with the twine path, tension, Knotter timing, or another component.

Knottia’s tip: One little piece of twine can cause the next tie to fail. After every mis-tie, clear the Knotter completely before trying again.

This issue usually points to a misaligned stripper point shearing against the knotter jaws, or a weakened knotter flat spring. Adjusting the stripper alignment or installing replacement springs will quickly restore a clean, tight tie.

Companies switching to stretchy bundling materials lookup tension errors. They find that elastic twines require far less tension than standard cotton varieties. Over-tightening the knurled brass tension nuts on older units or the newer modern units tension devise can causes elastic material to snap back violently, pulling entirely out of the knotter frame assembly mid-cycle. If using elastic twines, ensure the outer material cover the internal rubber at the stretching point or the rubber will break. Call BUNN Tech support for more information.

This is usually caused by

• Sharp burr on the knotter jaws.
• Stripper adjustment point is low causing cuts or splits.

Loud sound or vibrating sound prior to machine cycling on it’s own;

• Worn Clutch bearing needs replacing
• Recommend rebuilding the clutch, properly rebuilt will last another 7-10 years if not longer

Call BUNN Tech support for parts quote.

If the revolving arm keeps spinning continuously without stopping after one or two cycles.

• Take foot off pedal. Yes, holding down the pedal, you can speed tie thru cycles.
• broken trip spring
• worn kick-out pivot bold or holes
• worn clutch fork
• broken pin in the clutch

Call Bunn Tech support with your serial number.

With modern bans on single-use plastics, users frequently look up alternative materials like Bunn’s 100% biodegradable Environment Safe Enviro Cellulo Twine.

Feature [1, 2, 3, 4, 5] Feature                                 BUNN Machine Twine                                           Plastic Strapping (Polypropylene) Material Base                   100% natural Enviro Cellulo (plant Based).      Petroleum-based synthetic Polymers. Biodegradability             100% biodegradable and compostable               Degradation takes months. Non-biodegradable.                                                                                                                                        Microplastics remain for centuries. Recycling Profile            Can be composted directly with                           Highly problematic; small cut pieces clog                                                                organic plant waste                                                 recycling sorting sorters. Carbon Footprint           Extremely low; utilizes renewable                        High; relies heavily on global fossil fuel                                                                  agricultural resources                                             extraction and oil refining. Energy Input                   Requires basic mechanical                                      Requires high-heat chemical extrusion and                                                         spinning and weaving                                               polymer processing.  

With the new BUNN Quad Tyer, heavier bundles are now possible more than ever before.

The BUNN Quad Tyer is designed to give customers greater tying capability for heavier and more demanding applications, including certain metal bundles weighing more than 30 pounds.

But every product is different. Bundle size, shape, surface characteristics, the number of ties required, and the type of twine all affect the final result.

How do I know if BUNN can tie my product?

Don’t guess—let BUNN test it.

Call BUNN Technical Support and talk with our team about your application. Be ready to provide a sample of your actual product.

Our technical team may want to test your product firsthand to determine:

• Which BUNN machine is best suited for your application
• The appropriate BUNN twine
• How the bundle should be positioned and tied
• Whether the Quad Tyer is the right solution

Knottia’s tip: If it’s heavy, awkward, or difficult to bundle by hand, don’t assume it can’t be tied. Let BUNN test it first.

Call BUNN Technical Support and let us put your product to the test.

Due to the different styles of machines, types of twine, we do not offer online ordering, please call us at 800-222-BUNN with your serial number and current type of twine. We will double check your exact machine for proper parts for the best twine to be used.

A1:  Sort of….we have not seen a twine that allows the BUNN Tying Machine to perform with proper tension, consistency in the knotting process. These off-the-shelf/ catalog twines often generate excessive lint, cause frequent mis-ties, or fail during the high speed knotting process. Bundles are generally looser and use more twine costing in more material used, wasted in mis-ties and generally cost more than BUNN Twine. A2: Call us today, we will prove the difference by sending a sample to test in your BUNN machine. We will even walk you thru the proper tension adjustments allowing for a tighter bundle which will useless twine saving you material cost per bundle. BUNN Twines are Machine Grade American Made and American sourced raw materials. BUNN GREEN BROCHURE TWINE

Great Question, typically the answer would be yes, if this was 1960’s. Today’s twines in the open market are made to minimum specifications and not to BUNN Specifications. You see, the government used to have stronger specifications until the 1980’s and then relaxed to commercial strengths. BUNN created stronger twines that hold better, allow machines to perform better. Like most items cheaper doesn’t last as long or work as good. Don’t let poor quality twine ruin your production.

This is a highly frequent query from operators trying to save money. Problem with non Machine Grade Twines.

• Generic twine do not meet the BUNN parts dimensional specifications
• Generic twines are too thick, too thin, woven too loose or too tight.
• BUNN Twine is designed and manufactured for performance not for a one size fits all.
• Some twines could be too thick and break parts

Call BUNN Tech line, they will explain in depth on your specific unit. Please have serial number ready.

Yes, BUNN was one of the first to import Polytape back in the late 1960’s. Today, why would you want to use single use plastic? Bunn offers great solutions with 100% Environment Safe materials for tying machines.

No, when fed through an industrial machine, high-tensile natural fibers are incredibly rugged. While cheap, manual single-ply garden twine snaps easily under human tension, a Bunn machine uses uniform, mechanically calibrated tensioning arm paired with industrial multi-ply twine (often boasting breaking strengths from 43 lbs up to 120+ lbs). Furthermore, Canada Post’s extensive 90-day mail stream stress testing using automated string-tying systems resulted in a 0% failure rate, proving it matches the structural integrity of synthetic plastic straps.

Several situations can occur when the twine is not machine grade such as;

1. Improper BUNN Knot won’t hold properly
2. Improper Running Tension loose package
3. Improper Knotter Release early release or holding too tight
4. Excessive lint/ additional cleaning required
5. Knotting up material when pulled off cone into machine
6. Splitting at button
7. Inconsistent Knots
8. Knot pull apart/ not tight
9. Costly repairs

When the BUNN Tying Machine was invented at the turn of the century, BUNN pioneered the industry by using 100% cotton long before environmental awareness became mainstream. Throughout the 1900s, “green” was simply a color, not a marketing term. Decades ahead of its time, BUNN has always provided eco-safe automatic packaging solutions. Building on this legacy, BUNN introduced a new, 100% environmentally safe twine in 2025 called “Enviro Cellulo.” Unlike weak standard cotton twines, Enviro Cellulo is significantly stronger and performs better in BUNN Tying Machines, proving that modern sustainability does not mean sacrificing strength.

The best 100% plastic-free alternative to automatic bundle strapping is a mechanical string tying machine, such as a classic Bunn Tying Machine. Instead of melting synthetic polypropylene or polyester bands around products, these high-speed machines utilize heavy-duty, 100% biodegradable BUNN Enviro Cellulo Twine. A mechanical string tyer matches the high-volume speed of automated strapping tools while remaining completely zero-waste and free of single-use plastics.

Large mailing facilities look up alternatives to plastic strap bans. They find that Bunn’s 10-Ply Enviro Cellulo Twine achieved a zero-failure rate across millions of pieces of mail in postal testing, offering a 100% biodegradable solution.

Call BUNN today with your serial number to see what your machine was originally set to use when manufactured.

Not all twines are manufactured to a machine quality. Tying machines require superior breaking strength, knot strength and consistent outer diameter to create the best performance in the machines.