Precautions for Pet Bottle Preform

Update:12 Nov 2018

In the external literal meaning, maybe everyone still d […]

In the external literal meaning, maybe everyone still does not understand exactly what the pet bottle preform is. In fact, this thing is very common in our life, and then follow the Jilian mold together to understand What is the bottle of preforms around us?  Pet Bottle Preform are usually made by injection molding. They are durable, easy to transport, light and cheap, and are generally used to hold liquid items. As a professional pet prefabricator manufacturer, Jilian Mould is here to explain the following issues that need to be paid attention to:
1. Processing of plastic raw materials: Because pet materials contain hydrophilic lipid groups, they are sensitive to water at higher temperatures, so when the water content of the material exceeds the limit, the processed products will be products. Discoloration, brittleness, etc., so the raw materials must be dried before processing. Generally, the drying temperature is 150 ° C, and the drying time is more than four hours. It must be thoroughly dried.
2, the choice of injection molding machine: pet this material is stable at the point of time after reaching the melting point, while the melting point is relatively high, so in the choice of injection molding machine, must choose more temperature control section, their own The machine with less heat, and the actual weight of the water mouth Liao can not be less than 2/3 of the injection volume.
3, mold design: generally use hot runner mold forming technology to make  Pet Bottle Preform, and between the mold and the machine should preferably have insulation panels, the thickness is generally around 12mm, and to withstand high pressure. The depth should not exceed 0.03mm, otherwise the produced product is prone to flash.
4, the speed of injection: In general, the speed of injection molding must be fast, this can effectively prevent premature solidification at the time of injection, the general time is controlled within four seconds, too fast, it is easy to make boredom broken.
5, residence time: can not stay for too long, otherwise the molecular weight of the material drops, must avoid staying at temperatures above 300 °C. If the residence time is less than 15 minutes, it needs to be air-blasted; if it is more than 15 minutes, it needs to be lowered and cleaned with viscosity pe until it is turned on again.
Although it is not complicated to use a machine to make a Pet Bottle Preform, the process of molding the product is closely related to the manufacturing process. If you can understand the above precautions, it will definitely help you to make Pet Bottle Preform better.

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