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Introduction of two processing characteristics of plastic bottles

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Introduction of two processing characteristics of plastic bottles

2019-06-13
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Plastic bottles have certain processing and production methods, and the processing methods mainly include extrusion, injection molding, calendering, blow molding, molding, lamination, casting, and the like. The plastic bottle is blow-molded, which is to melt and melt the plastic and then press it into a special blow mold. At the same time, there is air pressure inside, and the plastic is pressed onto the mold to form the final product shape. Because the bottle is formed. When the pressure is outward, the internal stress of the bottle itself is inward. When the temperature of the heating reaches a certain level, the plastic softens and the resistance of the internal stress becomes small, so the bottle becomes smaller.


Plastic bottles have certain processing characteristics in processing and production, and are processed according to certain methods to ensure good quality and performance in production and processing. The following food plastic bottle manufacturers introduce the processing characteristics of plastic bottles in terms of shrinkage and fluidity:



1-shrinkage rate

Reinforced plastics shrink less than conventional compression plastics and consist primarily of heat shrinkage and chemical structural shrinkage. The factors that affect shrinkage are first of all plastics. Generally, phenolic is larger than epoxy, epoxy phenolic, unsaturated polyester, etc., and unsaturated polyester material has the smallest shrinkage. Other factors affecting shrinkage are the shape and thickness of the plastic part, the thick wall shrinks greatly, the plastic contains filler and the glass fiber has a large shrinkage, the large volatile content shrinks, the molding pressure is large, and the loading amount is large. The shrinkage is small, the hot mold release has a larger shrinkage than the cold mold release, and the curing is insufficient to shrink. The shrinkage rate of plastic bottles is one of the important factors affecting the use of plastic bottles. In use, the shrinkage rate of plastic bottles should be reduced to prevent important shrinkage during use and affect the actual use.


2-liquidity

The fluidity of the reinforcing material is worse than that of the general pressed plastic. When the fluidity is too large, the resin loss and the accumulation of the glass fiber are easily generated. If it is too small, the molding pressure and temperature will increase significantly. There are many factors affecting liquidity. To assess the fluidity of a certain material, it must be analyzed according to the composition. Factors affecting liquidity.

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