Discussion on Soft Stand Up Pouch Bags

In recent years, along with the deepening of plastic industry and the technological innovation degree of packaging machinery industry, soft packaging technology has been rapidly developed. Soft packaging forms develop from flat shaped bags to special shaped bags and stand up pouch bags; the sealing methods are also diversified, such as heat sealing, zipper closure. Stand up pouch bags and special shaped bags gain the popularity among with end consumers and many downstream customers in the market by excellent shelf appeal, which have been widely used in the cosmetic industry and food packaging, becoming new highlights in soft packaging area, and reflecting a trend of replacing the traditional plastic bottles and glass bottles. There are many types of stand up pouch bags currently on the market, such as helical seal square bottom bags, and fold corner bags. Here normal three-side-seal fold corner stand up pouch bags will be taken as an example to discuss production technology and common quality problems solution of stand up pouch bags.

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 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-level materials

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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