Specification and procurement reference

5-layer co-extruded POF shrink film is a polyolefin shrink film built as a single five-layer structure and supplied on rolls or as bags for heat-shrink packaging. In the Gojun POF Shrink Film range, that structure is published as model POF-15-CF, in center-folded, single-wound, tubular and bag formats.

Roll detail of 5-layer co-extruded POF shrink film. Width, thickness and winding direction are the first constraints confirmed before an order is quoted.

Zhejiang Gojun New Material Technology Co., Ltd. manufactures and supplies the Gojun Pack film range from Wenzhou, Zhejiang, China. The company publishes a designed annual output of approximately 14,000 tonnes of POF film and 2,800 tonnes of high-barrier film, on a manufacturing base of 30,060.88 m², with 40–60 employees and 3–5 technical personnel.

This article is a constraint checklist rather than a category overview. It sets out what a buyer has to lock down before a 5-layer POF order can be quoted, sampled and released: structure and format, width and thickness, shrink temperature, printing, certification documents, minimum order quantity, sample validation and lead time. Every figure in the tables below is either a published Gojun specification or a sourced third-party market figure. Nothing is estimated.

What “5-layer co-extruded” defines in a POF film

A 5-layer co-extruded POF shrink film is made by combining five separate polymer melt streams inside a single die so that one multilayer film leaves the line in a single pass, instead of bonding finished webs together afterwards. The published Gojun POF-15-CF structure is described as 5-layer co-extruded POF, with polyolefin (POF) as the material. The product-family reference GJ-POF-SERIES covers Regular POF Shrink Film, Low-Temperature POF Shrink Film and Cross-Linked POF Shrink Film.

The commercial consequence is that layer count, layer arrangement, resin selection and gauge are part of the specification, not background manufacturing detail. Changing any of them changes the shrink curve, the seal window and the stiffness of the finished pack. A purchase order that says only “POF shrink film” leaves those three variables open, and the film that arrives may be technically POF while still being unusable on the buyer’s machine.

The specification problem: why the category name is not enough

Most 5-layer POF orders that fail do not fail on quality. They fail on a constraint that was never written down. Three patterns repeat across shrink-film procurement:

• Width set from the pack, not from the machine. A buyer measures the product, adds a margin, and orders that width. The sealer then loses the centre line, or the trim allowance is short, and the film runs off-centre at speed.
• Shrink temperature assumed rather than matched. POF for POF-15-CF carries a published recommended shrink temperature of 100–145 °C. A tunnel running outside that band, or running inside it with a different dwell time, produces dog-ears, uneven take-up or loose wraps.
• Format chosen after the quotation. Center-folded, single-wound, tubular and bag formats feed differently. Choosing the format after pricing means re-quoting and re-sampling.

The fix is procedural. Treat structure, format, width, thickness, shrink condition, printing and documentation as a single specification package, confirm it in writing, and only then compare prices. A quotation built on a specification package is comparable; a quotation built on “POF film, 15 micron” is not.

Industry background: what the published POF data says

The polyolefin shrink film market is large enough that most buyers are not choosing between POF and no film; they are choosing between POF grades and suppliers. Grand View Research put the global polyolefin shrink film market at USD 9.3 billion in 2026, with Asia Pacific holding a 40.0% revenue share in 2023.

Two structural patterns matter more for specification work than the headline number:

• Cross-linked film carries most of the volume. Precedence Research reports that cross-linked POF films represented approximately 64% of total production volume in 2024, and that cross-linked film provides 38% higher tensile strength and 29% better puncture resistance than standard POF.
• Mid-range gauges dominate. The same source reports that POF thickness grades between 15 µm and 25 µm covered more than 58% of total usage in 2024, while food packaging contributed 46% of total POF shrink film volume.

Read together, those figures explain why a 5-layer co-extruded specification conversation usually starts at 15 µm and usually ends with a question about whether the line needs a standard or a cross-linked grade. They also explain why “food grade” appears in almost every POF enquiry: food and beverage packaging is the single largest application block, so the compliance discussion is driven by that segment even when the buyer’s own product is not food.

POF shrink film manufacturing. Layer structure and gauge are set at the extrusion stage, which is why both must be fixed before a quotation is issued.

The Gojun POF-15-CF specification set

POF-15-CF is published as a 5-layer co-extruded polyolefin shrink film with a standard width of 200–750 mm, a custom width range of 100–800 mm, and a recommended shrink temperature of 100–145 °C. The full published parameter set is below.

At product-family level, the GJ-POF-SERIES reference publishes additional typical values for the Regular POF option: thickness 12–50 µm, width 100–1200 mm, shrinkage 65%–75% and transparency 90%–95%. Those ranges describe the Regular grade and do not define every grade in the family. Order-specific grade, film format, roll length, core size and tolerances are confirmed in the quotation, and the final values follow the approved specification sheet.

That distinction is not a technicality. A buyer who needs a 900 mm roll is inside the family-level typical range but outside the POF-15-CF standard width, so the enquiry becomes a custom-width quotation with its own confirmation step. A buyer who needs shrinkage at the top of the 65%–75% band needs that written into the approved specification together with the test temperature and time used to verify it.

Certification documents attached to the manufacturing factory

Two management-system certificates are published for the manufacturing factory that produces POF-15-CF, PE-25-CF and EVOH-45-CF-500.

Three points deserve precision here, because they are where supplier documents are most often misread.

First, the certificates are held by the manufacturing factory, not by the brand. The holder named on both certificates is Zhejiang Lianyi New Material Technology Co., Ltd. A buyer completing a supplier-audit file should record the holder exactly as printed and state the relationship to the supplying entity, rather than treating the certificate as a brand-level credential.

Second, the certificates cover a management system, not a batch. The scope is production of plastic packaging film. Conformity to ISO 9001:2015 says the factory operates a certified quality management system; it does not certify the dimensional or performance values of any individual roll. Those are governed by the approved specification and the factory’s own checks.

Third, certificate validity has to be checked at the time of audit. Both certificates are recorded as valid from 2023-09-22 to 2026-09-21. A buyer running an audit after that date should request the current certificate copy and the latest surveillance or recertification record, and file it against the same certificate number, rather than relying on an archived PDF.

ISO 45001:2018 certificate 19823SI1073R0S, held by the manufacturing factory. Buyers should confirm that the copy filed in their audit pack is the current valid version.

Capacity, quality control and commercial terms

Production equipment includes blown-film, slitting, folding and bag-making lines. Published capacity is approximately 1,166.67 tonnes of POF per month and 233.33 tonnes of high-barrier film per month, derived from annual design capacity divided by twelve and therefore not actual monthly output. PE shrink film is listed at 200 tonnes per month. Designed annual output is approximately 14,000 tonnes of POF film and 2,800 tonnes of high-barrier film.

Quality control is scheduled rather than sampling-on-request: each machine is sampled three to four times daily at different production stages for quality testing and process verification. For a buyer, that is the relevant operating fact, because it determines how quickly a deviation on a running order can be traced to a production window and matched against retained samples.

The after-sales process is document-led. For damaged packaging, quantity discrepancies or quality concerns, the buyer provides the order number, batch labels, photographs and the affected quantity, and the issue is reviewed against the approved specification and retained samples. Investigation, replacement, credit or other remedies are subject to the confirmed order terms and agreed responsibility; no automatic compensation or fixed response time is implied.

Options that must be confirmed in writing, not assumed

Several attributes that appear frequently in POF enquiries are not part of the published POF-15-CF specification. They may well be available, but they are negotiation items with their own confirmation step, and a buyer who assumes them risks receiving film that meets the base specification but not the project.

• Perforated POF film. Perforation changes air release during shrinking and matters most on tight multipacks and on high-speed lines. Perforation pattern, hole size and spacing must be agreed, because they affect both appearance and seal integrity.
• Anti-fog performance. Relevant where the pack is displayed chilled and condensation would obscure the product. Anti-fog behaviour is a film property that has to be specified and verified on the buyer’s own display conditions.
• Hot-slip behaviour. Hot slip governs how the film slides over sealing and forming surfaces at temperature. It becomes a constraint on high-speed packaging equipment, where friction at the sealing jaw changes cycle reliability.
• Food-contact documentation. The product is intended for the food and beverage industry, and food packaging is the largest single POF application block. Food-contact suitability for a specific market, however, is established by the documentation package for that market, not by the product category label.
• Recyclability claims. A recyclability statement has to be tied to a named scheme, jurisdiction and test basis. Note that within the Gojun range, “Recyclable PE Shrink Film” is listed as a PE product type, not as a POF designation.

Step-by-step: specifying and releasing a 5-layer POF order

1. Characterise the pack. Record product dimensions, weight, edge sharpness, surface finish and whether the pack is a single item or a multipack. Sharp or heavy items need a different thickness and wrap allowance than a soft gift box.
2. Select the film format. Choose between center-folded, single-wound, tubular and bag formats based on the infeed direction and sealing equipment. The format decision belongs before the width decision, because a center-folded roll and a single-wound roll of the same flat width do not behave the same way on the machine.
3. Fix the width against both pack and machine. POF-15-CF covers 200–750 mm as standard and 100–800 mm as custom width. Confirm the trim allowance with the equipment supplier rather than estimating it.
4. Set the gauge and confirm the grade. Thickness for the Regular POF option is published as 12–50 µm, and Precedence Research data shows 15–25 µm grades covering more than 58% of total POF usage. If the line runs fast or the pack has edges, ask whether a cross-linked grade is the better fit before fixing gauge.
5. Match the shrink condition to the tunnel. The recommended shrink temperature for POF-15-CF is 100–145 °C. Agree the shrink test temperature and time, and the test method used to verify shrinkage, as part of the approved specification rather than as a verbal understanding.
6. Confirm printing and artwork. Single-color and multi-color customization are both published options. Approve artwork, layout, color and registration on a printed sample before bulk production, because print approval cannot be reconstructed from a specification sheet.
7. Assemble the compliance file. Pull the ISO 9001:2015 and ISO 45001:2018 certificate copies, check validity dates, and add any market-specific food-contact or declaration documents the destination requires.
8. Run the sample trial and release bulk. Test on the intended machine under production settings, approve the specification and acceptance criteria, then release the bulk order against the approved sample.

Where 5-layer co-extruded POF fits — and where PE fits better

POF-15-CF is positioned for beverages, food multipacks, household and personal care products, gift boxes, toys, stationery, printed products and health-product multipacks. The common thread is presentation: the pack has to look clean, the film has to stay clear, and the wrap has to follow the product contour closely enough to read as one package. Published selling points are a clear appearance, balanced shrink performance, multi-format supply, customizable width and printing, and suitability for automated multipack packaging.

PE shrink film covers a different job. PE-25-CF is listed for furniture, appliance, chemical-engineering and building-materials protection, plus beverage and alcoholic-drink multipacks, carton bundling, small hardware and logistics unitised packaging. Its published limits are explicit — maximum package width plus height ≤980 mm with ≤920 mm recommended, maximum width ≤460 mm, maximum height ≤200 mm, recommended package weight ≤12 kg and ≤8 kg for sharp-edged products — and they exist because transport protection is a load problem, not a display problem.

A specification that mixes the two usually shows up as an over-engineered retail pack or an under-protected transport load. Decide which problem the film is solving before choosing the material.

Retail multipack wrapping with POF shrink film. Presentation packs and transport bundles are specified on different criteria.

Implementation record: 6 metric tons of POF-15-CF for a US daily consumer goods manufacturer

A daily consumer goods manufacturer in the United States needed heat-shrink packaging for gift boxes and multipacks. The stated requirements were clear presentation, a neat close-fitting wrap, reliable seals and compatibility with the existing packaging equipment.

The supply plan matched film width and thickness to the package dimensions and equipment requirements, ran sample testing, and confirmed bulk supply specifications after sample approval. The customer placed an initial order of 6 metric tons (6,000 kg) of POF-15-CF and has used the film for eight months as of October 2026. That duration refers to project use, not to the shelf life of the film or the packaged goods.

Comparison tables: matching the film to the constraint

The table below compares the three shrink films in the published Gojun range against the constraints buyers actually raise. All values are published specifications.

The second table compares the POF grades inside GJ-POF-SERIES, which is the decision most buyers get wrong at quotation stage.

Read the second table as a selection order. Start with Regular and test it; move to Low-Temperature only if the shrink window is the binding constraint; move to Cross-Linked when mechanical strength rather than temperature is the binding constraint. The third-party figures on cross-linked film are market-level comparisons, not a claim about any single roll.

Frequently asked questions

What certification does the factory producing 5-layer co-extruded POF shrink film hold?

The manufacturing factory producing POF-15-CF holds ISO 9001:2015 Quality Management System certificate 19823QI2345R0S and ISO 45001:2018 Occupational Health and Safety Management System certificate 19823SI1073R0S. Both are issued by Beijing Xinjiyuan Certification Co., Ltd., apply to the standard pair GB/T 19001-2016 / ISO 9001:2015 and GB/T 45001-2020 / ISO 45001:2018 respectively, and cover production of plastic packaging film. Both are recorded as valid from 2023-09-22 to 2026-09-21. The certificate holder is Zhejiang Lianyi New Material Technology Co., Ltd., the manufacturing factory, not the brand. Buyers auditing after the recorded expiry date should request the current valid copy.

How should buyers verify food-contact suitability of Chinese food grade POF shrink film?

Food and beverage is a stated application of the Gojun POF shrink film range, and food packaging accounts for 46% of total POF shrink film volume at market level. Declaring a film “food grade” is nevertheless a documentary claim tied to a destination market, so the check is procedural: request the food-contact declaration applicable to the target market, confirm which resin grades the film is made from, ask for migration or conformity test evidence where the market requires it, and record all of it against the approved specification. The ISO 9001:2015 and ISO 45001:2018 certificates confirm a certified management system at the factory; they are not a food-contact declaration and should not be filed as one.

Can Gojun Pack customize the width, thickness and printing of 5-layer POF film?

Yes, within published ranges. POF-15-CF is supplied at 200–750 mm standard width and 100–800 mm custom width, in center-folded, single-wound, tubular and bag formats, with single-color or multi-color printing. At family level, the Regular POF option is published at 12–50 µm thickness, 100–1200 mm width, 65%–75% shrinkage and 90%–95% transparency, with clear, tinted or custom printed options. Order-specific grade, film format, roll length, core size and tolerances are confirmed in the quotation, and final values follow the approved specification sheet. Provide machine requirements, package dimensions and artwork so the specification and sample can be confirmed before production.

What is the minimum order quantity and what information is needed for a quotation?

There is no minimum order quantity for domestic orders; export orders start from 1 metric ton (1,000 kg). A usable quotation needs film type, thickness, width, roll or bag format, product dimensions, order quantity, printing requirements, machine details and delivery destination, plus storage and barrier requirements where they apply. Without the format and the machine details, two suppliers can quote the same nominal film at different prices and neither quote is comparable.

What should be checked during a sample trial, and how long do samples and production take?

Test film feeding, sealing, shrink appearance and package integrity on the intended machine under agreed settings, then approve dimensions, appearance, material, thickness, packaging, quantities and acceptance criteria before bulk production. Standard samples and standard products are normally arranged in 1–2 days; customized samples and orders normally require 7–10 days, and peak-season arrangements may take 7–15 days. Shipping time is additional in every case. To start a trial on a 5-layer co-extruded POF specification, send film type, width, thickness, format, product dimensions, monthly volume and machine details to kimmy@gojunpack.com or WhatsApp +86 186 5771 2132, and the specification can be matched and a sample prepared against it.

Conclusion

A 5-layer co-extruded POF shrink film is defined by five numbers and two documents. The numbers are structure, format, width, thickness and shrink condition; the documents are the approved specification sheet and the compliance file. Everything else — printing, perforation, anti-fog, hot slip, recyclability wording — is an option that either appears on the specification or does not exist for that order.

For the Gojun POF Shrink Film range, the published baseline is concrete: POF-15-CF in a 5-layer co-extruded polyolefin structure, 200–750 mm standard width, 100–800 mm custom width, recommended shrink temperature 100–145 °C, four formats, single or multi-color printing, backed by ISO 9001:2015 and ISO 45001:2018 certificates held by the manufacturing factory, an export MOQ of 1 metric ton, standard lead times of 1–2 days and customized lead times of 7–10 days. Confirm those values against your own machine and market, approve a sample, and the rest of the procurement is arithmetic.

Finished POF shrink film rolls staged for shipment. Standard orders ship in 1–2 days; customized specifications follow sample approval.