A kind of stand-up pouch and its composite film
A composite film and stand-up pouch technology, applied in the direction of synthetic resin layered products, laminated, layered products, etc., can solve the problem of "PE melting out, etc., and achieve good stiffness, good mechanical properties, and excellent heat-sealing performance Effect
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Embodiment 1
[0029] Example 1, preparing PE film.
[0030] Add composite layer resin raw materials, intermediate layer resin raw materials and heat-sealing layer resin raw materials to the three barrels of the co-extrusion machine respectively. The formula of each resin raw material is as follows:
[0031] Composite layer: 70wt% m-LLDPE and 30wt% LDPE.
[0032] Middle layer: 35wt% HDPE, 30wt% LLDPE, 34.7wt% LDPE and 0.3wt% fluoride additive.
[0033] Heat-sealing layer: 33wt% of LDPE, 65wt% of reinforced polyethylene resin, 0.7wt% of slippery agent and 1.3wt% of opening agent.
[0034] The polymer particles in the above three barrels are melted by the extruder to form a tube blank. After the tube blank is stretched, compressed air is blown out from the center of the die head of the extruder to blow the tube blank into a bubble-like film. The shaped film is cooled and shaped by the air ring cooling air to obtain a PE film.
Embodiment 2
[0035] Example 2, preparing PE film.
[0036] The formula of each resin raw material is as follows: Composite layer: 60wt% m-LLDPE and 40wt% LDPE.
[0037] Middle layer: 30wt% HDPE, 34.8wt% LLDPE, 35wt% LDPE and 0.2wt% fluoride additive.
[0038] Heat-sealing layer: 34.2wt% of LDPE, 63wt% of reinforced polyethylene resin, 0.8wt% of slippery agent and 2.0wt% of opening agent. All the other are with embodiment 1.
Embodiment 3
[0039] Example 3, preparing PE film.
[0040] The formula of each resin raw material is as follows: Composite layer: 66.7wt% m-LLDPE and 33.3wt% LDPE.
[0041] Middle layer: 33.24wt% HDPE, 33.24wt% LLDPE, 33.24wt% LDPE and 0.28wt% fluoride additive.
[0042] Heat-sealing layer: 32.43wt% LDPE, 64.85wt% reinforced polyethylene resin, 0.78wt% slip agent and 1.94wt% anti-opening agent. All the other are with embodiment 1.
[0043] The PE films prepared in Examples 1-3 were tested for their heat-sealing properties and mechanical properties, and the test results are shown in Table 1.
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