Linear Low-Density Polyethylene (LLDPE) Private-Label Film Requests: Compliance and Labelling Steps

Linear low-density polyethylene (LLDPE) in private-label film requests occupies a specific interface between resin certification and finished article labelling. LLDPE is an ethylene/α-olefin copolymer with density from 0.916 g/cm³ to 0.940 g/cm³ and blown-film melt index values normally from 0.5 g/10 min to 2.0 g/10 min at 190 °C and 2.16 kg under ASTM D1238-20 or ISO 1133-1:2022. A private-label request transfers visible branding to a retailer, but the converter remains responsible for polymer identity, additive package, migration status, and batch traceability. The compliance and labelling steps for private-label LLDPE film therefore begin with raw resin identity and end with the lot-specific commercial label and Declaration of Compliance.

How Do Private-Label LLDPE Film Requests Change the Regulatory Verification Sequence?

Under a private-label arrangement, the film carries a retailer’s mark, but the regulatory file must identify the converter as the manufacturer. In the United States, the base olefin polymer must be authorised under 21 CFR 177.1520; the final blended film must satisfy the density, melt index, and extractables specifications of that section, and any colorant used in the private-label film must meet 21 CFR 178.3297 or be covered by a suitable Food Contact Notification. In the European Union, the finished LLDPE film is a plastic material and article under Regulation (EC) No 1935/2004, and the converter must obtain a written Declaration of Compliance under Regulation (EU) No 10/2011, Annex IV. Overall migration for food-contact plastic articles must not exceed 10 mg/dm² of food-contact surface area, or 60 mg/kg when the article is intended for infants and small children; the applicable limit must be selected using the actual package geometry, fill volume, and contact ratio. The private-label buyer should state whether the film will contact aqueous, acidic, alcoholic, or fatty foods because the simulant assignment under Regulation (EU) No 10/2011, Annex III, changes from ethanol 10 % (v/v) to ethanol 50 % (v/v) or vegetable oil depending on worst-case intended use. Where the film enters the EU as an article, REACH Article 33 requires communication of substances of very high concern above 0.1 % w/w; the converter should obtain and file SVHC statements from the resin, masterbatch, and ink suppliers.

Before a private-label label proof is approved, the converter should compare the requested LLDPE grade with the actual extrusion record. A monolayer blown-film line with a barrier screw of L/D ratio 24:1 to 30:1, a die gap of 1.4–2.0 mm, and a blow-up ratio of 2.2:1 to 3.0:1 will run a 25 µm hexene-copolymer LLDPE of 0.918 g/cm³ and 1.0 g/10 min melt index at a melt temperature of 195–215 °C and a frost-line height of 250–500 mm. Under ISO 527-3, machine-direction tensile stress at break generally falls between 35 MPa and 55 MPa, with machine-direction elongation at break between 500 % and 700 %; dart impact measured under ASTM D1709A can range from 80 g to 220 g for a 25 µm monolayer depending on comonomer type and draw ratio. Gauge uniformity should be checked with a non-contacting capacitance gauge; a deviation beyond ±5 % alters the surface-area basis for overall migration calculation and can cause creasing, blocking, or ink registration loss on downstream packaging lines. If the private-label request permits gauge reduction from 50 µm to 25 µm, seal strength, tear resistance, and puncture energy must be revalidated because the dominant failure mode shifts from tear propagation to puncture under retail handling.

Seal initiation temperature and coefficient of friction are further batch-level variables for private-label LLDPE film used on form-fill-seal equipment. A butene-based LLDPE of 0.918 g/cm³ may show a seal initiation temperature between 95 °C and 110 °C when measured on a laboratory hot-tack apparatus at 0.5 N/mm² seal pressure and 0.5 s dwell under ASTM F1921; hexene- or octene-based grades can shift onset lower by 5–12 °C under equivalent conditions. Kinetic coefficient of friction film-to-film, measured under ISO 8295, commonly falls between 0.2 and 0.6 for slip-modified LLDPE. Slip-agent overdose can reduce the value below 0.2 and create roll instability, while insufficient slip can produce values above 0.6 and cause jamming in vertical form-fill-seal equipment. Corona-treated LLDPE exposed to ambient humidity above 70 % RH may lose surface energy faster because of water uptake and additive bloom; private-label specifications should therefore state storage in sealed polyethylene outer wrap between 10 °C and 40 °C.

When Recycled LLDPE Enters the Private-Label Formulation, What Additional Data Are Required?

Private-label specifications occasionally call for post-consumer recycled LLDPE in non-food collation film, refuse sacks, or padded mailers. For food-contact layers, recycled LLDPE is not automatically authorised under 21 CFR 177.1520 or Regulation (EU) No 10/2011; the converter must obtain the recycler’s process description, feedstock source, decontamination validation, and any applicable FDA no-objection letter or EU authorisation before approval. If the private-label product is non-food, the compliance file should still record the recycled-content claim using ISO 14021:2016 definitions, because an unqualified “contains recycled material” statement on retail packaging can be challenged when the precise pre-consumer or post-consumer proportion is not documented. Batch acceptance tests for recyclate-containing LLDPE should include melt filtration pressure rise through a 20 µm screen pack at 200 °C, optical gel count per 0.1 kg of film, and dart impact under ASTM D1709A; published data for specific private-label configurations is limited, so pass/fail ranges should be established from plant capability studies rather than generic resin datasheets. In the EU, REACH Article 33 communication and disposal guidance must follow the article, and the label or shipment document must not imply food-contact suitability if the recyclate stream is not food-grade.

Lot-level traceability for private-label LLDPE film begins with an alphanumeric batch code that links the finished roll to the resin lot, extruder line, shift, gauge-control record, corona treatment level, and released test report. Under ISO 9001:2015, clause 8.5.2, the identification and traceability records must allow recall of the lot; under Regulation (EC) No 1935/2004, Article 17, traceability must be ensured at all stages to facilitate withdrawal. A label proof for private-label LLDPE film should include the product name, nominal thickness and width, net weight, batch code, production date, recommended storage maximum, country of origin, and the responsible legal entity. For US shipments, the Fair Packaging and Labeling Act, 15 U.S.C. 1453, requires a statement of identity, net quantity in both SI and inch-pound units, and the name and place of business of the manufacturer, packer, or distributor. For EU food-contact film, Article 15 of Regulation (EC) No 1935/2004 requires that the material or article be labelled or accompanied by information identifying the business responsible; the glass-and-fork symbol may be required by national transposition, and the written Declaration of Compliance must be available to the customer and to competent authorities on request. A private-label LLDPE label should not contain the statement “complying with Regulation (EU) No 10/2011” unless the full supporting documentation package is complete for the lot.

Language of the label is controlled at member-state level in the EU. The converter must confirm whether the private-label LLDPE film is supplied as a material or article for further processing or as a finished consumer packaging article. Business-to-business transit labels may carry the information in the language agreed between the converter and the buyer, but the Declaration of Compliance must be available in the official language of the member state where the material is placed on the market when requested by authorities. In the US, 15 U.S.C. 1453 applies to consumer packages, not necessarily to industrial cores or pallet wraps; the private-label customer must define whether the labelled unit is a consumer package or a distribution package because the legal entity and net quantity statement change accordingly.

A Compliance Audit Framework for Private-Label LLDPE Film Documentation

The audit is not complete when the resin datasheet matches the purchase order; each lot must be traced from receiving to label release. The following control points are reviewed before private-label LLDPE film is released.

Where the private-label request involves a multi-layer structure with a tie layer or sealant layer, monolayer migration data should not be extrapolated to the finished film; published data for this specific configuration is limited and plant-specific migration testing should be commissioned under the intended food simulant. Each label proof and compliance letter should reference the exact lot number because private-label buyers commonly change packaging formats across stock-keeping units, and a document that describes the product only by trade name can create an inaccurate food-contact claim.