PVC/PE,PS/PAN/PP, its process has co-extrusion blow molding and multi-layer injection blow molding two. Method of making plastic bags. 1. Co-extrusion and blowing maggots is a processing method in which the plasticized resin is simultaneously squeezed into the multi-layer machine head by a child extruder, and then the mandrel becomes a multi-layer blank, which is then blown. Multi - layer blow molding container has good air tightness. Mainly used in cosmetics, medicine and food packaging.

2. Stretching and Blowing technology is a processing method that uses the injected bottom billet to stretch under the softening degree and then blow into shape. Stretch blow molding products have good transparency, tensile strength, impact strength, surface hardness, rigidity and air tightness are improved, this method is especially suitable for PET, PP and other materials.

3. Extrusion stretching and blowing for the production period of the bottle, the process is to first use the extrusion method to melt the resin into tubular billet, and then the bottom of the billet is fused into a bottom billet, and then the billet is treated to the ideal stretching M degree longitudinal stretching, blowing hollow bottle. The method is mainly used for processing PP raw materials, and the products are mainly small thin-walled bottles. This process is used for processing. The impact toughness, quiet strength, transparency, surface gloss and rigidity of the products have been improved or increased. The process is shown in Figure 1-10. The popularization of plastic bags in Beijing.

4. The process is mainly used to produce PP, PET or PVC bottles. The process is to melt the resin first

5. Extrusion blow molding is mainly used to produce large hollow vessels (large hollow vessels generally refer to the volume > 501. Of poke, pile body, storage tip, box and other hollow products). When processing large containers, the billet is heavy. If only relying on the extruder level slow extrusion will lead to the billet sag and uneven wall thickness, and the long extrusion time will cause the billet surface to be cold. These factors will affect the quality of containers. Therefore, when extrusion blow molding production, in the front end of the extruder set up a dish storage device. The molten material is stored in it first, and then pressed out into shape.

4.1 Cupping molding

Calendering molding is the melt plasticized thermoplastic plastic squeezed into two or more parallel rollers, melted plastic through each pair of rod rotation and extrusion, the formation of a certain thickness, width and light selling products. Calendering molding can process PVC,PE,PP,ABS,EVA and other thermoplastics, so that the most month J is PVC. Calendering products to film, sheet, sheet - based.

A) Technological process

Calendering molding technology mountain batching, plasticizing, feeding, calendering four units. The use of plastic bags.