In the field of flexible packaging, the heat sealing process of films plays an important role. It not only affects the formula structure of film products, but also affects the production process before and after production. Generally speaking, there are several important factors that affect heat sealing. Heat seal temperature, heat seal strength and heat seal layer thickness are interrelated. Heat seal temperature affects heat seal strength. The thickness of the heat-sealing film in the heat-sealing layer plays an important role in the heat-sealing effect.
Heat sealing performance is an important performance of plastic packaging film. The GBB-A1 electronic heat seal Tester can accurately determine the suitable heat sealing temperature range, heat sealing speed, heat sealing pressure, plastic film substrate, flexible packaging composite film, coated paper, aluminum foil and other heat sealing compounds, etc.
Film heat sealability test:
(1) In GB/T10003-2008 the heat seal strength index of heat sealable BOPP film is ≥ 2.0N/15mm wide.
The test method is as follows: cut 5 samples evenly along the width direction of the film roll, the sample width is (15 ± 0.1) mm, and the length is 150 mm. During the test, the sample is folded in half, and the two are aligned and placed on the welding surface of the heat sealing machine for heat sealing. The heat sealing conditions are temperature 135 ℃, time 18, pressure 1.810 °Pa, aluminum-gold-gold. Place the sample straight with the heat-sealed part as the center line, and clamp the two ends of the sample on the two fixtures of the testing machine . The longitudinal axis of the sample should coincide with the centerline of the upper and lower grips and should be tight enough to prevent the sample from slipping and breaking in the grips. The distance between the clamps is 100mm, the test speed of the tensile machine is (100 ± 10) mm/min, and the maximum load when the sample breaks at the heat seal is read. If the sample is not broken at the heat seal, the sample is invalid and another sample should be taken for replacement. The result is the arithmetic mean of 5 samples, expressed in N/15mm.
(2) The heat-sealing strength index of B/T000-2008 heat-sealing pearlescent film is ≥ 1.8N/15mm wide, the heat-sealing condition is 130~140℃, the time is 1, the pressure is 0.18MPa, and the tensile speed is ( 100 ± 20) m/min.
(3) The heat seal strength index of polyolefin heat shrinkable film of CB/T19787-2008 packaging material is ≥ 9.0N/15mm wide.
The test method is as follows: longitudinal and transverse samples are heat-sealed. The heat sealing conditions are temperature (140 ± 5) ℃, pressure 0.18MPa, time 19. According to the QB/T2358 standard, the heat seal strength test adopts a long strip sample. The sample width is (15 ± 0m), and the tensile speed is (25050) mm/min. The results are averaged with one decimal place.
(4) Heat sealability test of PE and PP inner layer heat seal materials.
