The heat resistance of the wholesale biobased fruit fork used in our daily life is not very good, and this problem makes us feel headache. Here's how to improve the heat resistance of wholesale biobased fruit fork!
1. Control the injection cooling time of wholesale biobased fruit fork. Strictly control the injection cooling time of wholesale biobased fruit fork, so that wholesale biobased fruit fork can be demoulded as soon as possible. This can shorten the molding cycle and increase the yield, and spherical crystals can be induced due to the higher residual temperature. Spherical crystals have a small crystal diameter (only 0.3mm to 0.7mm) and do not affect transparency.
2, choose a reasonable wholesale biobased fruit fork and bottle design. The optimized wholesale biobased fruit fork shape design and bottle mold design help to improve the thickness distribution of bottle wall and avoid deformation or shrinkage deformation in different areas of bottle body.
3, strictly control the injection and blow molding process parameters and the temperature distribution of each area, to avoid releasing residual stress under the glass transition temperature of PET ( 75°C), resulting in bottle deformation.
4, circulation air supply technology. When using a hot blow mold, how to control the deformation of the bottle after stripping is very important. Before the blow mold is opened, air is blown in and circulated, and the bottle body is cooled and shaped to control the amount of deformation after the release. The intake of the recirculated cooling air passes through the same channels as the primary and secondary blowouts, but is discharged through the drawbar through a small hole in the head of the drawbar. Cycle blowing time is about 0.5 seconds to 2 seconds. Therefore, the high pressure air consumption of the heat-resistant bottle making machine is much higher than that of the ordinary bottle making machine.
5, the application of temperature regulation technology of blow molding mold. A hot oil circulation method is usually used to heat blow moulds. There are three types of cycles that regulate the temperature of the blow mold: the cooling water cycle at the bottom of the bottle. Keep the bottom of the bottle at a low temperature (10 ° C ~ 30 ° C) to avoid excessive crystallization and whitening of the bottom of the bottle without stretching. Bottleneck temperature adjustment (optional). After ejecting from the injection mold, the amorphous bottle mouth is completely cooled. Most amorphous caps use an enhanced cap design (increasing the wall thickness of the cap) to improve sealing performance and avoid cap deformation. Usually, the ellipticity of the bottle mouth after filling is controlled within 0.2mm, and the shrinkage of the outer diameter of the thread is less than 0.6%.
Bottle body heating oil circulation. Heat the blow mold to 120°C to 145°C. In this way, the temperature difference between the preformed billet and the blow mold cavity can be reduced, resulting in further crystallization. Extend the pressure holding time of the blowing bottle, so that the bottle wall and the cavity are in contact for a long time, and there is enough time to improve the crystallinity of the bottle, reaching about 35%, but not destroying the transparency. Mold temperatures below 100 ° C have little effect on the crystallinity of the bottle, because crystallization of the bottle occurs above 100 ° C.
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