TPU (Thermoplastic Polyurethane) hot melt adhesive membrane production device

Abstract

The invention discloses a TPU (Thermoplastic Polyurethane) hot melt adhesive membrane production device. A release water tank for releasing a TPU hot melt adhesive membrane is arranged on a forming mechanism. The release water tank is provided with a pair of forming rolls for extruding a TPU molten mass to the TPU hot melt adhesive membrane, wherein a forming gap is formed between the forming rolls, and the forming gap is located right below an extruding die. The forming rolls are soaked in the release water tank. The TPU molten mass is extruded by the forming rolls to form the TPU hot melt adhesive membrane. Water in the release water tank can effectively prevent the TPU hot melt adhesive membrane from being adhered to the forming rolls. Just one release paper is required in production. Meanwhile, the release water tank further has the cooling effect of the forming rolls, so that the production efficiency is improved. The device provided by the invention is simple in structure, and the production cost is effectively lowered and the product quality is improved at the same time.

Description

【Technical Field】 [0001] The invention relates to film production equipment, in particular to a TPU hot melt adhesive film production equipment. 【Background technique】 [0002] TPU is thermoplastic polyurethane. It is an environmentally friendly high molecular polymer. It is non-toxic, abrasion-resistant, oil-resistant, transparent, and elastic, and it also meets environmental protection requirements. It overcomes many defects of PVC and PU. It not only possesses most of the characteristics of rubber and ordinary plastics, but also has excellent comprehensive physical and chemical properties. Therefore, it is also called the future material. TPU hot melt adhesive film is a TPU hot melt adhesive film made of TPU hot melt adhesive pellets through a special process. TPU hot-melt adhesive film is widely used in daily necessities, sporting goods, toys, decorative materials and other fields. Halogen-free flame retardant TPU can also replace soft PVC to meet environmental protection re...

AI Technical Summary

Problems solved by technology

The crystallization speed of TPU hot-melt adhesive pellets is very slow after heating and melting, and TPU hot-melt adhesive cannot be added with anti-adhesive agent. Adding anti-adhesive agent will seriously reduce the adhesion fastness of subsequent customers, so TPU hot-melt adhesive film is very sticky , it will stick to the forming roller after contacting with the forming roller, resulting in the failure of normal traction

There are two methods for the production of commonly used TPU hot melt adhesive film: the first method is to use two layers of release paper to sandwich the TPU melt in the middle after the extrusion die is extruded into a TPU hot melt adhesive film by forming rollers. , The release paper plays a protective role, and this method wastes a layer of release paper; the second method is to use a layer of release paper, and the forming roller on the side of the TPU melt is coated with Teflon, but during production , the Teflon on the forming roller still occasionally adheres to the TPU melt, causing defects such as air bubbles between the release paper and the TPU hot-melt adhesive film, resulting in an increase in the defect rate, and the Teflon will gradually wear out after a period of production. And disappear, for this reason, have to re-plate Teflon again, its cost is higher

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