PET bottle is one of the cosmetics are often used to packaging bottle type, the material of the bottle cost is not too high, so the PET bottle for so many cosmetic container material, or a high cost performance, also have been affected by a lot of cosmetics brand in the market customers.
So popular bottle in injection molding should pay attention to what?
Because PET macromolecular contains aliphatic, has must of hydrophilic, aggregate at high temperatures is sensitive to water contrast, when the moisture content is beyond the limit, in the processing of PET molecular weight decreased, finished product with color and crisp.
Therefore, it is necessary to carry out the material before processing dry, the temperature is 150 ℃, boring more than 4 hours, generally is 170 ℃, 3 -
Available air-launched inspection data is completely dry.
Recover the material share generally don't exceed 25%, and to recover the material completely dry.
PET for short time after the melting point, and melting point is higher, and therefore need to choose more temperature control section and plasticizing since the conflict less heating system of injection, and cosmetics packaging
bottle manufacturers of finished products (
Water cut materials)
Practice component is not less than two-thirds of machine injection quantity.
PET bottle embryo stream is commonly used in mold design, mold and injection molding machine templates have the insulation board, its thickness is about 12 mm, and the heat shield will be bound to accept high pressure.
Exhaust is necessary enough to prevent present in overheating or fracture, but its vent depth generally do not exceed 0.
3 mm, or simple flash.
Injection speed is faster, in order to prevent premature solidification in the process of injection.
However, rapid and high shear rate, make the material become fragile, usually in 4 seconds.
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