GB/T 21302-2007General rules of laminated films & pouches for packaging (English PDF)

3.1 Terms, definitions and symbols

3.1.1 Material

Here it refers to different types of resins, plastic films, coated films, paper, aluminum foil, etc.

3.1.2 Lamination method

Dry lamination, wet lamination, wet lamination, extrusion lamination, coextru-lamination, etc.

3.2 Abbreviations

4.1 Classification by structure

Products are divided into 4 categories, based on material structure, as shown in Table 1.

4.3 Classification by application

Products are divided into food packaging and non-food packaging based on application.

5.1 Appearance quality

Appearance quality of films and pouches shall comply with the provisions in Table 2.

5.2 Printing quality

5.2.1 Gravure-printing

Gravure-printing quality shall comply with the provisions of GB/T 7707-1987.

5.3 Specifications

5.3.1 Dimensional deviation of flat film

Dimensional deviation of flat film in length is determined by both supplying-demanding sides through negotiation; dimensional deviation in width is ±2 mm; average width deviation is ±10%.

6.1 Sample state adjustment and standard test environment

Follow the standard environment prescribed in GB/T 2918-1998 and normal deviation range; air temperature is (23±2)°C; relative humidity is (50±10)%; state adjustment time is not les than 4 h; and test is carried out under this condition.

6.2 Appearance quality

Visually test in natural light; and measure with the measuring tool of which the precision is not less than 0.5 mm.

6.3 Printing quality

6.4 Dimensional deviation

6.4.1 Dimensional deviation of films and pouches in length and width follows the provisions of GB/T 6673-2001.

6.4.2 Thickness deviation of films and pouches follow the provisions of GB/T 6672-2001.

6.5 Physical and mechanical properties

6.5.1 Pulling strength and elongation at break

Follow the provisions of GB/T 1040.3-2006. Use strip sample; the length is >= 150 mm; the width is >= 15 mm; gauge length is (100±1) mm; tensile speed (no load) of the sample is (250±25) mm/min.

Mount the test piece of which the diameter is 100 mm TO sample-film fixing ring; then puncture with a steel-needle, of which the diameter is 1.0 mm and the spherical top diameter is 0.5 mm, at speed of (50±5) mm/min; read the maximum load when the steel-needle penetrates the test piece. Test more than 5 pieces; take the arithmetic mean value. Puncture strength test device is shown in Figure 1.

6.5.12 Friction coefficient

Follow the provisions of GB/T 10006-1988.

6.5.13 Surface resistivity

Follow the provisions of GB/T 1410-2006.

6.5.14 High-temperature medium resistance

Respectively put 4% acetic acid (HAc), 1% sodium sulfide (Na2S), 5% sodium chloride (NaCl) aqueous solution, and refined vegetable oil into pouch; then exhaust the air and seal; carry out high-temperature pressurization treatment in autoclave with anti-pressure cooling device at 121°C for 40 min; cool to below 40°C under the condition that the temperature is maintained unchanged; take out and inspect the appearance one by one;

6.5.16 Hygienic property

Follow the provisions of GB/T 5009.60-2003; in which, detection of diaminotoluene follows the provisions of GB/T 5009.119-2003.

8.1 Marking

Inside and outside packaging of each product shall be accompanied by product qualification certificate, indicating product name, specifications, quantity, batch number, date of manufacture, code of inspector, name of manufacturing plant, plant address, executive standard number, etc.

8.2 Packaging

Films and pouches are generally packaged in paper-carton lined with Kraft paper or thin film; it may also be determined by both supplying-demanding sides through negotiation.

8.4 Storage

Products shall be stored in clean, dry, ventilated, suitable-temperature warehouse; avoid sunlight; the distance to heat source is not less than 1m; products shall be reasonably stacked. […]