From the scientific name we do not necessarily know what plastic bottle embryo is. In fact, in life, we see the probability of pet disposable plastic soup spoon is still quite large, let's take a look at PETdisposable plastic soup spoon. PET disposable plastic soup spoon is a typical injection molding product, easy to transport, mostly plastic raw materials, uniform texture, good insulation, is an intermediate product of plastic bottles and oil drums. In general, PETdisposable plastic soup spoon injection molding should pay attention to the following aspects:

1, plastic treatment: Because PET macromolecules contain lipids, with a certain hydrophilicity, the particle is more sensitive to water at high temperatures, when the water content exceeds the limit, the molecular weight of PET decreases in processing, and the products are colored and brittle. Therefore, the material must be boring before processing, and the boring temperature is 150 ° C for more than 4 hours, generally 170 ° C for 3-4 hours. The material can be checked by air fire to see if it is completely boring. The share of recovered material should generally not exceed 25%, and the recovered material should be boring.

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

3, mold and gate planning: PET bottles are generally formed with hot runner mold, mold and injection molding machine template Z should have a heat insulation board, the thickness of about 12mm, and the heat insulation board must be able to accept high pressure. The exhaust should be sufficient to avoid partial overheating or fragmentation, but the depth of the exhaust port should generally not exceed 0.03mm, otherwise a flash will simply occur.

4, melt temperature: can be measured by air injection method. 270-295℃ range, enhanced grade GF-PET can be set to 290-315℃.

5, injection speed: the general injection speed should be fast, which can avoid premature coagulation during injection. But too fast, high shear rate makes the material fragile. The shot is usually completed within 4 seconds. 6, back pressure: the lower the better, so as not to wear. Generally not more than 100bar. Generally do not need to use.

7, residence time: do not use too long residence time to avoid molecular weight decline. Try to avoid temperatures above 300 ° C. If the shutdown is less than 15 minutes. Only air fire processing is required; If it exceeds 15 minutes, it should be cleaned with viscosity PE, and the barrel temperature should be lowered to PE temperature until it is turned on again.

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