Blow molding products processing plant multi-layer blow molding processing

2023/04/25

Author: MULAN -Plastic Molding Manufacturer

Blow molding products processing plant Multi-layer blow molding is a blow molding method for manufacturing hollow products from multi-layer parisons produced by injection molding or extrusion. The resulting products have the characteristics of blocking load, carbon dioxide and moisture, and are resistant to chemicals, and can be used as beverages. bottles, fuel cans, and containers for chemicals, but at a higher cost. Blow molding products processing plant Multi-layer blow molding generally adopts the co-extrusion method to obtain the parison and then blows it to obtain the product. Like the extrusion blow molding described in the previous article, the multi-layer parison molding of co-extrusion blow molding also has two methods: continuous and intermittent, but the continuous method is mostly used. The main difference between co-extrusion blow molding machinery and single-layer extrusion blow molding machinery is the extrusion system and co-extrusion parison head. Various polymers are melted and kneaded by their respective extruders into a uniform melt, and then pumped into the co-extrusion head for compounding. Melts with different humidity and rheological properties should be well compounded together in the machine head. Therefore, the blow molding products processing plant Using a coextrusion head is the key to coextrusion blow molding. The inflation and cooling process of the multi-layer parison is similar to that of the single-layer parison. The blow mold used for co-extrusion is very similar to the single-layer extrusion blow mold, except that the edge of the clamping blank needs to be specially designed, because when the edge of the clamping blank is designed like a single-layer blow molding mold, the stickiness of the joint on the product The joint strength will be lowered, resulting in delamination. For this reason, blow molding products processing plants It is necessary to adopt an enhanced clamping opening design to maximize the contact area on both sides of the inner layer of the product, seal the outer layer from one side to the other, and clamp the middle layers to improve the adhesion and adhesion of each layer in the blanking area. Seam strength, which is especially important for multi-layer containers such as packaging chemicals. .

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