First, Production Technology
The biggest difference between three-side-seal fold corner stand up bags and ordinary flat bags lies in that the oval-shaped bottom bag requires secondary heat seal. Core of the entire production technology and equipment requirements are embodied in the bag strength, tightness and heat seal the end of symmetry. To produce high quality stand up pouch bags requires attention to the punch, dropping bag end, heat sealing, and other aspects. Particularly its four-storey and two-storey parts of the heat are extreme due to low heat seal strength and rupture. Thus heat seal cutter should be assembled to strengthen the local heat sealing.
1. Requirements for Materials
Because stand up pouch bags have high mechanical performance requirements for materials, they generally use composite membrane with more than three layers, with the following requirements to external, middle and inner material:
External layer of printed materials, currently used, stand up pouch bag among general BOPP film, printing materials, BOPET, BOPA, high mechanical strength, high barrier properties of thin films. To select material based on usage, such as selection of BOPP, Matt BOPP film, are used to wrap solid products choice of BOPET or BOPA film used for packaging liquid products.
Middle managers generally opt for high strength, high barrier materials, BOPET, BOPA, VMBOPET, aluminum foil, etc. Inner material
Inner seal material, generally use the CPE or OPE, CPP has low heat seal performance of thin film and want to have good health and antistatic properties.
2. Requirements for Devices
Stand up pouch bags have special requirements on the structure of bag making machines. In addition to the roll device, double pendulum, sealing device, cutting unit, tension device, sensor devices of the three-side-seal bag making machine, there is an auxiliary device providing basic materials for stand up pouch bags.
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