Publish Time: 2022-12-23 Origin: Site
PET preform mould requires high precision, the difficulty lies in the thin wall of the test tube, the concentricity of the mold is difficult, the output of the test tube is relatively large, 8 cavities, 16 cavities, 32 cavities are relatively common, so the steel material of the mold should be selected well .
What should I do if the surface of PET preform mould is not smooth enough?
What are the production precautions for PET preform mould?
What are the requirements for PET preform mould?
There are generally several situations for the sticking of PET preform mould. One is that the cooling water is not cold enough, the other is that the bottom mold and the bottom of the bottle form a vacuum, and the third is that the bottom of the bottle is surrounded by the bottom mold, so it cannot fall off. The bottom of the bottle is round enough, and you can check whether the thickness around the bottom is consistent, or if it is not consistent, it is uneven shrinkage. It can also be seen whether there is a phenomenon that the mold is opened a little when blowing, and this should be carefully observed. Check whether the water nozzle of the bottle embryo is in the middle of the bottom of the bottle. If one side is white and very thin, it may be that the heating is not transparent enough, and the temperature can be appropriately increased. Another point is to check the preforms of all cavity numbers to see if there is any eccentricity.
Gate design of PET preform mould PET preforms are generally formed by hot runner moulds. It is best to have a heat insulation board between the mold and the injection molding machine template, the thickness of which is about 12mm, and the heat insulation board 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 should generally not exceed 0.03mm, otherwise it is easy to produce flash.
1. The flow channel of PET preform mould should reduce the pressure drop of the melt as much as possible, avoid using a higher melt temperature, the flow channel should be short and thick, the ratio of surface area to cross-sectional area should be small, and circular flow channels should be used.
2. Under the premise of avoiding melt injection, the PET gate should be opened at the thickest part of the plastic part, which can avoid the shortcomings of large flow resistance and fast cooling, and ensure that it fills the mold cavity.
3. The opening direction of the PET preform mould gate should preferably face the cavity wall or the thick core, which can change the flow direction and reduce the flow rate, so that the molten material can evenly fill the cavity and avoid surface defects.
4. PET preform mould is fake plastic when it is melted.
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