TPE/TPR injection molding temperature setting problem
Under the same hardness and mixed system, SEBS substrate IPE requires higher injection molding than TPR of SBS substrate (this IPE, TPR is called U method is just a customary name within TPE production enterprises, which may be different from the user's name) temperature.
(1), the material
1. Under the same hardness and mixed system, the IPE of SEBS substrate needs to be higher than the TPR of SBS substrate (this IPE, TPR called U method is just a customary name within TPE production enterprises, which may be different from the user's name) injection temperature.
2. For TPE of the same type of substrate (such as SEBS or SBS), the higher the hardness, the higher the injection temperature of the material. relatively obvious. For example, the super soft TPE with a hardness of 000^, the injection temperature can be set at 120150C to 0K, and the medium and low hardness TPE with a hardness of 10~30 degrees, the injection temperature generally needs to be 180^200C.
3. The molecular weight affects the fluidity of the material, which determines the selection of different injection temperatures. The TPE of the same base material (SBS), the higher the molecular weight of SEBS, the higher the injection temperature required for the material. The injection temperature of conventional TPE is 180~200℃, while the TPE based on SEBS in some polymers, The injection temperature is also normal at 230250^C. The theoretical explanation of macromolecular chemistry is: macromolecular heavy SEBS, the entanglement between molecular chains is more tightly, and the molecular chain has a greater effect, so that the molecular chains must be moved from relative sliding (high elastic state) to overall flow (viscous fluid state). , which requires higher performance (ie, higher injection temperature) than conventional SEBS.
(2) The county of injection molding equipment
1. The injection molding machine with large tonnage (large amount of plasticized and melted glue in the screw barrel) has stronger plasticizing capacity. The same TPE and TPR materials may require a relatively lower injection temperature.
2. If the mold inlet is relatively small, a higher injection temperature is required.
(3) The setting of the plasticizing temperature of each segment of the injection molding machine (refer to the screenshot above)
As mentioned above, different reference injection temperatures are selected for TPE and TPE materials of different compounding systems. Generally, the temperature from the barrel, the feeding section, the plasticizing section to the injection section, the barrel to the feeding section and then to the plasticizing section gradually increases to the highest temperature, but the temperature should be slightly lower at the position of the injection nozzle.
(4) The reference injection temperature setting of common TPE and TPR materials (nozzle injection temperature)
1. Super soft TPE (hardness 000^0), the recommended injection temperature is 120^150^C.
2. For general injection molding TPE (based on SEBS) and TPE/TPR with P, the recommended injection temperature is 180 "200C.
3. For TPE and TPR sticking to PS, the recommended injection temperature is 160^190C.
4. For TPE and TPE sticking to ABS, the recommended injection temperature is 170^200C.
5. For TPE and TPE sticking to FC, the recommended injection temperature is 190° 220^C.
6. For TPE and TPR sticking to PA, the recommended injection temperature is 230° 280C.
7. High strength and high elasticity TPE, TPR, the recommended injection temperature is 210250^C.
(5) Determination of suitable injection temperature
Look at the surface effect of the TPE strip coming out of the injection nozzle. If the surface is smooth and slightly bright, it means that the plasticization is OK and the temperature is appropriate. If the strip is very bright, the injection temperature can be appropriately lowered. On the premise of ensuring the plasticizing effect, the use of the lowest injection temperature can reduce the cooling time, thereby improving the production efficiency of customers.
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