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4 production processes of TPU film
​Extrusion method: add tpu raw materials into the barrel of the extruder, heat and melt, extrude the sheet-shaped TPU film, cut the edge, and wind. ​Blow molding: The forming feature of blow molding is that the extruded TPU film is made into a tube blank with the help of an annular gap mold, and compressed air is introduced axially from the mandrel, and the TPU film is clamped with a pair of clamping rods to keep it Constant internal pressure, expanding to the required outer diameter. After cooling and shaping, traction and coiling.
2023-04-07
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4 production processes of TPU film

    Extrusion method: add tpu raw materials into the barrel of the extruder, heat and melt, extrude the sheet-shaped TPU film, cut the edge, and wind.

    Blow molding: The forming feature of blow molding is that the extruded TPU film is made into a tube blank with the help of an annular gap mold, and compressed air is introduced axially from the mandrel, and the TPU film is clamped with a pair of clamping rods to keep it Constant internal pressure, expanding to the required outer diameter. After cooling and shaping, traction and coiling.

    Calendering method: It is a method of continuously forming TPU film by means of several shafts, which are heated inside and rotate next to each other, and the thickness of TPU film depends on the gap of the last shaft.

    Casting method: first melt, filter, and defoam the TPU raw material, and then send it to the casting machine, and use the casting nozzle to cast the solution into a TPU film of corresponding thickness.

    Stretching method: It is a film-forming method that stretches the TPU film longitudinally and transversely between the softening temperature and the melting temperature. Mainly two-way stretching. Biaxial stretching can improve the performance of TPU film.

    The TPU film has good water resistance under sewage, and it is not easy to undergo obvious hydrolysis reaction within 1 to 2 years, especially the polyether series products are stronger. Polyester series products will be completely decomposed after soaking in water at 50°C for half a year, 3 weeks at 70°C or 3 to 4 days at 100°C. This is one of the reasons why TPU film is suitable as an environmentally friendly material. For products in contact with water, it is recommended to use polyether series products.

    粉色透明TPU薄膜 - 副本.jpg

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TPU hot melt adhesive film vs anaerobic adhesive: "Scene flexibility" difference in automotive interior bonding
2025-09-11
​From the perspective of curing conditions, TPU hot melt adhesive film does not need to rely on special environments, while anaerobic adhesives are severely restricted by "auerobicity". The curing principle of anaerobic glue is to undergo polymerization under conditions of lack of oxygen and catalyzed by metal ions (such as iron and copper). If it is in an environment where air circulation or metal substrates are not available, the curing speed will be greatly slowed down or even unable to cure. In automotive interiors, most bonding scenarios are "open" (such as bonding the door panel skin to PP substrate, and the ceiling fabric to the sponge), the air can freely contact the bonding surface, and the substrate is mostly non-metallic (PP, ABS, fabric, etc.), lacking metal ion catalysis, and additional catalyst is required when using anaerobic glue, and the curing time is as long as several hours, which is difficult to meet the needs of industrial production. The TPU hot melt adhesive film only needs to be melted by heating (120-160℃) and can be cured after pressurization and cooling. It does not need to rely on the ambient oxygen concentration or the base material. It can be cured stably in open or closed bonding scenarios, and the curing time only takes a few dozen seconds to a few minutes, adapting to the fast-paced needs of the interior production line.
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