Recently, Gansu Jinchang Jinchuan Wanfang Industrial Co., Ltd. used its own advantages and developed a number of new products for the quadruple-membrane and 3-7-layer composite heavy bag films at several universities and national research institutes within the United Nations.
This quadruple-membrane is composed of a plastic braided cloth, a PE film, a BOPP film, and a calendered film, which are compounded by a cast double film head coating process. The outer laminated film is printed on the front and then laminated with a pearlescent film, which can be used to make high-grade bags.
The 3-7 layer composite bag film is made of PE, PP, EVA, PVDC for each layer of material, using a co-extrusion blow process to make a multi-layer co-extruded film. In particular, the co-extrusion of PVDC resin as an intermediate layer with other types of resins overcomes the difficulty of PVDC alone in extrusion molding. The company's four-in-one high-grade bag film and 3--7-layer composite bag film have the following development results: First, the coating shed was chosen to achieve a solid composite with the plastic-bonded cloth requirements. The second is to obtain the optimal process parameters for temperature control in each zone of the single screw extruder and the T-die. The third is the accurate positioning of the front and back of the film during high speed compounding. Fourth, it is preferable that the specification and the ratio of the flat yarns used for the PP woven fabrics are the same. Both of these films also have a 30% lower production cost than conventional dry compound films, and they all achieve solvent-free residue and cleanliness.
Source: China Food News
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