GB/T 41220-2021Laminated lidding film for food packaging (English PDF)

5.5.5 Other physical and mechanical properties

Tensile force, nominal strain at break, right-angle tear force, coefficient of friction, resistance to pendulum impact energy, heat resistance, cold resistance, puncture strength, light transmittance and The properties such as haze are negotiated by both the supplier and the buyer.

6.1 Standard environment for sample conditioning and testing

According to GB/T 2918-2018, the temperature is 23°C±2°C, the relative humidity is 50%±10%, the state adjustment time is not less than 4h, and Experiments were carried out under these conditions.

6.2 Sampling

The samples should be intact, and the sampling quantity is sufficient to complete the test items. When sampling the film roll, the surface three layers should be removed, and then along the width of the film roll. Sample the cut.

6.3 Appearance quality

Visually inspect under natural light and measure with a measuring tool with an accuracy of not less than 0.5mm.

6.4 Printing Quality

6.4.1 Gravure printing quality

According to the provisions of GB/T 7707.

6.4.2 Flexographic printing quality

Carry out according to the provisions of GB/T 17497.1 or GB/T 17497.2.

6.4.3 Barcode Printing Quality

Carry out according to the provisions of GB/T 14258 and GB/T 18348.

6.4.4 Hanxin code printing quality

According to the provisions of GB/T 21049.

6.5 Dimensional deviation

6.5.1 Length and width deviations

According to the provisions of GB/T 6673.

6.5.2 Thickness deviation

According to the provisions of GB/T 6672.

6.5.3 Repeat length deviation

Measure with a measuring tool with an accuracy of not less than 0.5mm. For repeat lengths less than 80mm, take 10 consecutive repeat length measurements, Then take the arithmetic mean value for calculation; for the repeat length greater than or equal to 80mm, take 5 consecutive repeat length measurements, and then take the arithmetic mean value. mean calculation.

6.6 Physical and mechanical properties

6.6.1 Inner peel force

According to the provisions of GB/T 8808.

6.6.2 Heat Seal Strength

6.6.2.1 The heat sealing method and conditions of the film and the sheet material to simulate the food container shall be negotiated between the supplier and the buyer.

6.6.2.2 After the cover film and the sheet are sealed by the heat-sealing testing machine, take the heat-sealing part as the center and open at 180°. Clamp the cover film on the tester In the fixture, the sheet is clamped into the lower fixture, and the axis of the sample should coincide with the centerline of the upper and lower fixtures. The clamp spacing is 50mm, and the test speed is 300mm/min±20mm/min, read the maximum load when the sample is delaminated with the sheet or the sample is broken.

6.6.2.3 Other conditions shall be carried out with reference to the provisions of QB/T 2358.

6.6.3 Water vapor transmission

Carry out according to the provisions of GB/T 1037 or GB/T 26253. During the test, the contact surface of the contents shall face the low pressure side of the water vapor or the water vapor On the low concentration side, the test temperature is 38°C±0.6°C, and the relative humidity is 90%±2%.

GB/T 1037 is the arbitration method.

6.6.4 Oxygen transmission rate

Carry out according to the provisions of GB/T 1038 or GB/T 19789. During the test, the contact surface of the contents should face the low-pressure side of oxygen or the low-concentration oxygen degree side.

GB/T 1038 is the arbitration method.

6.6.5 Tensile force and nominal strain at break

Carry out according to the provisions of GB/T 1040.3-2006.

The sample adopts the type 2 strip, the length is greater than or equal to 150mm, the width is 15mm±1mm, and the distance between the sample clamps is 100mm±10mm 1mm, the tensile speed of the sample is 200mm/min±20mm/min.

6.6.6 Right-angle tearing force

Carry out according to the regulations of QB/T 1130.

6.6.7 Coefficient of friction

According to the provisions of GB/T 10006.

6.6.8 Anti-pendulum impact energy

According to the provisions of GB/T 8809.

6.6.9 Heat resistance

Put 1/2~2/3 of water into the heat-sealed container with the cover film and seal it. Put it in a heating container for heating (use temperature exceeds 100°C When the heating container needs to be equipped with a back pressure device). The boiling or steaming temperature is the highest temperature of the category of use of the sample or the temperature agreed between the supplier and the buyer, The holding time is 30min or the time agreed by both parties. After heating, let it cool to room temperature naturally, and check whether the cover film is obviously deformed, layered or not.

The phenomenon of peeling off between parts, peeling off of heat-sealed parts, etc.

6.6.10 Cold resistance

Put 1/2~2/3 of water into the heat-sealed container with the cover film and seal it, keep it at -18°C for 12h, and then dissolve it naturally at room temperature.

Freeze or warm to 10°C~20°C with warm water around 20°C. Check whether the cover film has obvious deformation, interlayer peeling, peeling of heat sealing parts, etc. Phenomenon.

6.6.11 Puncture strength

According to the provisions of GB/T 21302.

6.6.12 Transmittance and haze

According to the provisions of GB/T 2410.

6.7 Connectors

Visual inspection under natural light.

7.1 Inspection classification

Product inspection is divided into factory inspection and type inspection.

7.2 Factory inspection

7.2.1 Batch

A batch of products of the same category, the same material structure, and the same specification that are continuously produced with the same raw materials and the same process. maximum batch size More than 500000m².

7.2.2 Inspection items

The inspection items are appearance quality (5.1), printing quality (5.2), dimensional deviation (5.3), joint (5.4), inner peel force (5.5.1) and heat seal Strength (5.5.2).

7.3 Type inspection

7.3.1 Inspection items

The inspection items are all the items specified in Chapter 5.

7.3.2 Inspection frequency

In one of the following situations, type inspection shall be carried out.

a) When a new product is tested for type identification; […]

7.5.1.3 Dimensional deviation

If it meets the requirements of 5.3, it is judged that the size deviation is qualified.

7.5.1.4 Connectors

If the requirements in 5.4 are met, the joint is judged to be qualified.

7.5.1.5 Inner layer peel force and heat seal strength

If there are any unqualified items in the test results of inner layer peel force and heat sealing strength, double samples should be taken from the batch to re-examine the unqualified items and re-inspect.

If all the results are qualified, it will be judged as qualified.

7.5.1.6 Other physical and mechanical properties

If there are unqualified items in other physical and mechanical properties, double samples should be taken from the batch to re-examine the unqualified items, and the re-inspection results are all satisfactory. Qualified, it is considered qualified.

7.5.2 Determination of qualified batches

The results of all testing items are qualified, then the batch of products is judged to be in compliance with this document.

8.1 Logo

Each package of the product should be accompanied by a product certificate and marked with the product name, specification, quantity, quality, batch number, production date, inspector's representative number, the name of the manufacturer, the address of the manufacturer and the number of this document, etc.

8.2 Packaging

Use plastic film or paper that meets food packaging requirements as inner packaging.

8.3 Transport

When transporting, avoid collision or contact with sharp objects, light loading and unloading, and avoid sun and rain to ensure that the packaging is intact and the product is not contaminated dye. The marking method is carried out in accordance with the provisions of GB/T 191.

8.4 Storage

The product should be stored in a clean, dry and ventilated warehouse, avoid sunlight, not less than 1m from the heat source, and stack reasonably.