The main elements of biobased fruit fork molding are plastic treatment, selection of injection molding machine and mold and gate design, etc. Only by handling these elements well can we produce high-quality products. However, sometimes there will be some quality defects, such as yellow bottle embryo, excessive wall thickness change rate, etc., which need to be discovered and solved in time to avoid affecting its normal use. What are the elements of PET plastic bottle forming?

1, plastic treatment

Because PET macromolecules contain lipid groups and have a certain hydrophilicity, the particles are more sensitive to water at high temperatures, and when the moisture content exceeds the limit, the molecular weight of PET decreases during processing, and the products are colored and brittle. The proportion of recycled material in PET bottles is generally not more than 25%, and the recycled material should be dried.

2, injection molding machine selection

Because PET has a short time to stabilize after the melting point and a high melting point, it is necessary to choose an injection system with more temperature control sections and less self-friction heat generation during plasticization, and the actual weight of the product (water mouth material) can not be less than 2/3 of the machine injection amount.

3. Retention time

Do not use too long retention time to prevent molecular weight decline, and try to avoid temperatures above 300 ° C. If the shutdown is less than 15 minutes, only air fire treatment; If it is more than 15 minutes, it is necessary to clean with viscosity PE, and reduce the barrel temperature to PE temperature until it is turned on again.

4. Mold and gate design

biobased fruit fork, generally with hot runner mold molding, mold and injection molding machine template is better to have a heat insulation plate, its thickness is about 12mm, and the heat insulation plate must be able to withstand high pressure. The exhaust must be sufficient to avoid local overheating or fragmentation, but the depth of the exhaust port is generally not more than 0.03mm, otherwise it is easy to produce flash.

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