Stick Pack Film & Machine Compatibility

Treat stick pack film as part of the process

PET/PE and PET/AL/PE are examples of heat-sealable laminates in the powder equipment information. Those names identify the broad structure. Layer thickness, coatings, sealant chemistry and surface behavior can still differ between grades and suppliers. Ask for the exact material code and specification, then have the film supplier and equipment team review it against your product and finished pack drawing.

Further reading: Find related purchasing guides

• 1. Film grade: material code, revision, full structure and grade-specific evidence.
• 2. Roll specification: width, core, diameter and winding direction.
• 3. Web layout: lane strips, back seal, artwork and registration marks.
• 4. Trial record: product, film, settings and observed defects by lane.

Common stick pack laminate structures and how they differ

The powder reference page lists PET/PE, PET/AL/PE, NY/AL/PE and paper/PE as candidate heat-sealable structures. These names describe layer families, not a material grade or a measured barrier rating. Use the list to request specifications from the film supplier, not to rank moisture, oxygen or puncture performance.

Ask for the material code, layer thicknesses, coatings and sealant specification behind each candidate. Barrier and puncture conclusions need evidence for that exact grade and its intended conditions. A change of supplier or grade can change the forming and sealing behavior even if the layer names remain identical.

Further reading: Source of the four candidate film structures

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Choosing film for powder, liquid and granule stick packs

For powders, describe moisture, oxygen and aroma sensitivity to the film supplier and request grade-specific evidence for the proposed structure. Include dust observed near the seal in the trial brief. Do not assume that a foil layer or a named sealant solves product contamination; retain samples from every lane for the agreed closure checks.

For liquids and gels, record the filling conditions and any drip or tail near the end seal. Ask the supplier to assess the exact laminate and sealant against those conditions and the intended squeezing or opening action. The liquid reference page supplies the equipment context; the proposed roll and web drawing still need review before printing.

For granules, describe particle shape and any damage observed at folds or seals. Evaluate a nylon-containing candidate using the exact film grade’s puncture data and filled samples under the agreed handling conditions. Inspect the folds and seals where coarse particles contact the film.

Related reading: Powder Stick Pack Machine: Auger Dosing; Liquid Stick Pack Machine for Gels; Granule Stick Pack Machine: Drink Mixes; Nutraceutical Stick Pack Machine; Protein Powder Stick Pack Machine

What should a stick pack film specification include?

A complete specification covers the material and the physical roll. Ask your film supplier for the full layer structure, total thickness, roll width, core dimensions, maximum roll diameter and winding direction. Add the print repeat, registration-mark position and artwork orientation. Where available, include dimensional tolerances and the supplier's recommended sealing conditions. Keep a material code and revision on the specification so that the trial roll can be matched to the later production order.

Physical roll details are easy to overlook when the discussion concentrates on barrier properties. A roll must fit the unwind arrangement and present the film in the correct direction. The print orientation must also agree with how the web is slit and formed into lanes. Send a simple roll-unwinding illustration if the supplier's terminology is ambiguous. Fixing this before printing is far easier than finding the artwork facing the wrong way when the roll reaches the machine.

Complete the four inputs listed at the start of this guide using this specification table. Keep the completed version with the trial record and compare any changed field before ordering replacement film.

Further reading: Check the published candidate laminate list

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How does lane layout affect roll width?

Lane layout sets the roll width. A multi-lane machine may divide one wide web into several strips before forming the packages, so the required width depends on the machine arrangement, finished pack geometry and allowances for seals, slitting and edge trim. No universal rule converts finished pack width into a roll order for every machine; use the selected supplier's approved web-layout drawing as the purchasing reference.

Distinguish three quantities: the unfolded strip width for one lane, the finished external pack width, and the number of active lanes. The strip wraps the tube and also supplies the back-seal material. Its developed width is therefore not the finished flat width. The roll layout combines all lane strips with the specified trim and slitting allowances; use the approved drawing rather than treating finished width multiplied by lane count as a roll order.

That drawing should show the lane arrangement and the relationship between repeated artwork, registration marks and cut positions. Check whether each lane uses identical artwork and whether any inspection or coding equipment needs a reserved area. If more than one pack width is planned, ask which parts and roll widths change. A machine's advertised package range does not mean that one roll specification or one forming set covers the entire range without adjustment.

Related reading: Single vs Multi-Lane Stick Pack Machines

Further reading: Distinguish external dimensions from usable tube width

Check forming and web movement with the real material

Web movement can only be judged with the real material, because curl, stiffness, friction and roll quality all influence how the film travels from the roll through the guides and forming parts. During a trial, watch whether the film tracks steadily across all active lanes and whether the formed pack stays aligned with the sealing and cutting positions. Record recurring wrinkles or sideways movement instead of judging only the first acceptable pack.

Compare startup, sustained running and restart samples. Problems may appear as roll tension or operating conditions change, even if the first packs look acceptable. Record adjustments with the roll identification and keep samples that show wrinkles or sideways movement. That gives the film supplier and equipment team evidence to investigate whether the cause lies in the material, forming parts or machine settings.

Further reading: Packaging Digest: a packer’s experience testing film and machinery together

Develop a usable sealing process

Sealing conditions have to be established with the actual film and product, not copied from another project. The sealant layer must work with the selected sealing arrangement, and temperature, pressure and contact time interact with the film construction and machine motion. Start from the material supplier's guidance and settle the conditions through an agreed trial. A temperature borrowed from another product is not a validated setting for your package, especially after a change of grade or thickness.

Look at the product as well as the film. Powder near the sealing area and liquid left by a nozzle can interfere with closure. Powder dosing and dust management, or liquid shutoff and nozzle timing, should be reviewed alongside the sealing settings. Record the agreed methods for evaluating finished seals and the conditions under which samples were made. Raising the temperature does not cure product contamination, poor alignment or a mechanical setup problem.

Related reading: Coffee Stick Pack Machine & Packaging; Energy Gel Stick Pack Machine

Align printing, registration and cutting

Print, seal and cut stay in step when the registration mark, the sensor and the web layout agree. The sensor lets the control system coordinate printed artwork with the packaging cycle, so the mark design and location must suit the proposed sensor. Send the artwork file for review before the print order is released. Include the code area, tear feature and intended cut position, since these details compete for the same limited space on a narrow package.

During testing, inspect packs from every lane. Check whether artwork remains consistently positioned and whether the cut avoids important text. Repeat the inspection after a stop and restart rather than relying on a single strip of samples. Ask the supplier to show how the operator recognizes and responds to lost registration. Keep the accepted artwork revision with the production recipe and film specification so nobody combines an old print file with a later pack drawing.

Record the sensor requirements supplied for the proposed machine: mark position, contrast, repeat and reserved artwork area. Compare those fields when film or artwork changes, and review the revised file with the equipment team before printing.

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Who supplies the film, and how it is approved

Film rolls are normally supplied by you or by your film supplier, and the equipment team reviews the specification against the proposed machine. Agree early who owns each part of the decision: your product team sets the barrier and shelf-life needs, the film supplier proposes and documents the structure, and the equipment team confirms that the roll fits and that it tracks, forms, seals and cuts on the configuration you are buying.

Approval comes from a trial, not a data sheet. Send the candidate specification first, then a trial roll of the exact grade together with a product sample, and judge forming, registration, sealing and cutting on every active lane. Keep the approved roll identification with the trial record. When a new supplier or grade is proposed later, repeat the affected checks before ordering printed production rolls.

Related reading: Stick Pack Machine Sample Testing

When machine-trial conclusions do not apply

A successful machine trial demonstrates that the tested material can be processed under the recorded conditions. It does not, by itself, establish a shelf life, a recycling route or suitability for every product-contact use. Keep the relevant supplier documents tied to the exact film grade and ask the people responsible for your product to define any additional evaluation required for its market and distribution conditions.

When changing film for cost, sourcing or sustainability reasons, compare the new specification with the approved grade and repeat the affected checks. Assign responsibility for reviewing material performance, machine compatibility and artwork. Keep both trial records. If a production problem follows the substitution, the team can see which material and settings changed instead of starting the investigation from memory.

Create a film trial record that can be reused

A useful record includes the supplier, grade, batch or roll identification, dimensions, drawing revision and product batch. Add the machine configuration, active lanes, operating settings, trial duration and accepted output. Note setup waste separately and retain examples of the acceptable package and any recurring defect. Photographs should show both the whole pack and the relevant seal or registration detail.

Send the record when asking for help with film compatibility. Say whether the problem appears on every lane, at a particular speed or only after a restart. If you are still choosing film, share candidate specifications before placing a large print order. Keep the approved trial record available for factory acceptance and operator training, and update it when a material change is tested.

Calculate strip width, reel length and film consumption

For a fin-seal drawing that defines cavity lay-flat width W and adds fin material S at each developed edge, strip width = 2W + 2S. A lap-seal drawing instead adds its specified overlap to the developed circumference. Obtain that convention from the approved drawing. Parent-web width = active lanes × strip pitch + left edge allowance + right edge allowance; identify whether gutters or seam material are already included in the pitch before adding them.

For an ideal tightly wound roll, length in meters = π(D_outer² − D_core²)/(4,000t), with diameters and film thickness t in mm. Measure the outside diameter of the core rather than its bore, and use the actual film thickness. Compare the geometric estimate with the converter’s stated roll length or the unwinder record, since winding condition affects the reel. Whole machine cycles available from that length = floor(1,000 × length / cut pitch in mm), before recorded threading and setup consumption.

For web width B and cut pitch p in meters, basis weight b in g/m², N active lanes and accepted fraction y, film use = B × p × b / (N × y) kg per 1,000 accepted packs. Use the full purchased web width to include outer trim. For an operating-period comparison, reconcile issued film against returned rolls and accepted packs; this captures setup material that a steady-running layout calculation leaves outside its boundary.

For a constant cam contact fraction f, estimated dwell in milliseconds = 60,000f / cycles per minute. Obtain f from the machine motion information or measure jaw contact time, and check the film at that contact condition. Servo profiles may change contact time independently of cycle rate. Keep temperature, pressure, dwell and film-grade identity together when comparing seal results.

Common Questions