Application of PET bottle in hot filling beverage
1. The special quality requirements of hot filling process for PET bottles
The heat resistance of the bottle is better. To overcome the influence of hydrothermal (high temperature) on the shape of the bottle: high temperature softens the bottle, high temperature and hot liquid create high pressure inside the bottle. It is better to control the volume shrinkage rate between 1% and 1.5% at high temperature (85℃～90℃).
The bottle must be able to withstand negative pressure. It is necessary to overcome the negative pressure generated in the bottle after the liquid is cooled; the bottle wall shrinks (the side wall of the bottle is deformed when it becomes flat and the negative pressure shrinks, and it is elliptical).
2. Blowing method of hot filling PET bottle
One-step method: After the produced preform is crystallized on the bottle mouth by the crystallization furnace, it is directly blown with a high-temperature mold. Advantages: high yield, easy for mass production. Disadvantages: The high temperature resistance is poor, and the high temperature resistance decreases significantly with the extension of time, and the storage time cannot be too long.
Two-step method: After the produced preforms are crystallized on the bottle mouth by the crystallization furnace, two sets of molds are used to complete the hot-filling bottle blowing. First, use the first set of larger-volume molds (low-temperature molds) to stretch and blow the preforms into super-large-volume bottles; then send the bottles to a heating furnace for heat treatment (eliminate the internal stress caused by stretching); heat treatment After it is finished, it is sent to the hot mold (the mold with the final required volume), and the bottle is further heat-treated (increasing the crystallinity of the bottle body), shaped, and finally blown into a bottle of the desired shape and size. Advantages: The bottle has good high temperature resistance and long storage time. Disadvantages: low output is not suitable for large-scale production.
LONES Plastic Machinery Co., Ltd. is located in Huangyan Zone, Taizhou City, focusing on PET bottle design, semi-automatic and full-automatic bottle blowing machines, bottle mold manufacturing, pet preform, bottle cap molds etc as well as a series of product solutions; products are widely used In: mineral water, beverages, food, medicine, chemistry, reagents and other fields;
As always, the factory adheres to the concept of "Reputation priority, Service priority, Reliable quality", and manufactures bottle blowing machine with stable performance, low energy consumption, simple operation and durability to benefit every customer and provide customers with comprehensive technical support and services;
In more than ten years of business, manual PET blowing bottle machine Manufacturers' equipment has been exported to Southeast Asia, the Middle East, Europe, South America, North America, Australia, Africa and other countries, and at the same time, received customer satisfaction reviews.