The main influencing factors and molding methods of hot melt adhesive film

Hot melt adhesive films are now a good composite material that can be quickly bonded to both sides after high temperature stamping. Due to its strong laminating capacity, hot melt adhesive films have been accepted by more and more people as a press-fitting auxiliary material. The emergence of hot melt adhesive films is a revolutionary change for the press-fit process.

The hot melt adhesive film makes the hot melt adhesive into a film of a certain thickness, placed between the sticky objects, and the bonding is implemented by heating, which helps industrial production to achieve scale, improve production efficiency and save rubber materials. The hot melt adhesive into a film needs to consider the rheology, film formation and other properties of the raw material, and there are many film forming methods, such as coating method, blow molding method, casting method and calendering method.

The coating method is commonly used to produce release film, and the coating method can be divided into light roller coating, anilox coating, scraper coating, spray coating and curtain coating. Different coating methods are used according to different products and different coating characteristics. Key properties of release films produced using the coating method include coating uniformity, high residual adhesion, flatness and high cleanliness. The quality of the coating equipment, the dispensing of silicone oil, and the environment of the workshop are closely related to these characteristics.

The blow molding method is that the resin is melted and plasticized by the extruder, led vertically upward from the annular head, and then introduced into the traction roller by the herringbone after blowing, and then obtained the finished product through the guide roller and the winding device. The blow molding method causes the longitudinal and transverse molecules of the product to be stretched to varying degrees due to a blowing process. The temperature resistance and heat sealing performance of the product will be greatly affected.

The resin is melted and plasticized by the extruder, and extruded from the machine head through the slit mold mouth, so that the melt is tightly attached to the cooling roller, and then it is peeled, stretched, slitted and coiled to obtain the finished product. This is the casting method, the production efficiency of the casting method is very high, and the product quality stability is good. There is less waste in the production process, and it is easier to realize online recycling edges and waste, and the utilization rate of materials is high.

Calendering method, the resin is melted and plasticized by the extruder, extruded from the machine head through the slit mold opening, calendered and cooled by the three-roller calender, and then cooled by the cooling conveyor roller and the winding device to obtain the finished product. The calendering method is better than the blow molding method in all performance indicators, thickness and thinness uniformity of the product, and the heat shrinkage of the product; Calendering production in the product thickness range and raw material adaptability also has great advantages. However, in terms of investment, the calendering process is more than ten times higher than the blow molding process. Compared with the casting method, the same scale of the production line, because the casting method is to take vertical operation, its operation is more complex and more difficult, and the casting method can not produce products with a thickness of more than 1.5mm.

The above content is the hot melt adhesive film manufacturer M.F.B.S. small editor summary, I hope to help you. If necessary, please feel free to contact us.