High quality PET beverage bottles from high quality preforms

Initially, consumers only paid attention to the quality of the beverage itself, and now it has gradually begun to pay attention to the packaging of beverages. The quality of PET bottles depends on the quality of the preforms that are supplied. There are two types of preforms when they are injection molded. One is a long rubber mouth and the other is a short rubber mouth. Manufacturers of domestic bottle embryos use more short plastic bottle embryos, and overseas use more long plastic ports. The rubber mouth of the long plastic mouth is cut off due to the rubber mouth at the bottom, so that the tension is evenly distributed during the blowing process, so that the quality of the blown bottle will be better, and the cut away part can be recycled, which is beneficial to save raw material cost. In today's increasingly scarce oil resources, domestic manufacturers will be more inclined to plastic preforms. The control of preform quality during production depends on the extent to which preforms are prevented from being scratched during transport.

The development of PET (polyester) beverage bottles in China has only been a decade or more. The history of hot-filled PET beverage bottles in China is even shorter. It is only about 6 years, but the development momentum is more than most other. Packaging container. As we all know, tea beverages, fruit juice drinks, etc. are the focus of beverage development. Most of the packaging containers are PET hot-filled bottles, and the proportion is increasing. PET beverage bottles are generally produced by injection molding into a preform, which is stretched longitudinally and stretched horizontally to form a blown bottle. If the final molding in this production process is mechanically cold set, then once the PET bottle reaches a PET glass transition temperature (78°C) in use, its molecular chain will relax and the bottle will have a severe shrinkage phenomenon. Bottles are only suitable for cold filling drinks. The hot-filling bottle is always at a relatively high temperature (about 140° C.) during the above-mentioned process of drawing and setting. The PET molecular chain is set at a high temperature in a relaxed state, and finally the bottle body produces a large amount of neat, dense products. The degree of finish can reach 30% to 45%, so that the bottle has a higher heat resistance, and has become a practical hot filling bottle.

Nowadays, most domestic manufacturers use belt conveyors for preform conveying. This is an older method of conveying technology. The disadvantages of this transport are as follows:

When the preform comes out of the injection molding machine, the temperature is between 45°C and 55°C. Dropping directly on the belt can cause bumps between the preforms.

In addition, the preforms are stacked disorderly on the belt and the preforms are not evenly cooled.

When the preforms come out of the injection molding machine, there may be quality problems in the embryos injected into one of the cavities. It is difficult to determine which cavity in the cavity has problems because the preforms are stacked in disorder.

When the injection molding machine is used to inject the preforms, a cavity may be formed in one cavity, which is disorderly and disorderly. If counting is still based on the number of injection molding cavities, the counting will be inaccurate.

The belt conveyor, the quality control of the preforms must be completed manually. The first is that the quality is difficult to control, and the second is that the excessive exposure of personnel causes pollution.

Nowadays, in Japan, South Korea, and China Taiwan, the bottle-feeding preforms are usually used in a certain sequence. Its production process is as follows:

The preform forming machine removes all the rubber mouthpieces from the front end of the preform and conveys the end of the bottle to the end of the delivery machine and conveys a detection machine and a counting and packing device.

The advantages of this delivery method are as follows:

1. The robot removes the preforms from the injection molding machine. Each preform has its own number. The preform is removed by the robot and does not drop directly to avoid scratches. Since the position of each preform is numbered, when the injection molding machine injects a problem, it is possible to accurately find out which cavity has a problem.

2. The preforms are transported by the plate chain gripping the neck of the preform, so that the preforms are transported in an orderly manner in a certain order. This allows the preforms to cool evenly for easy counting, and the counting error per 10,000 preforms is within ±5.

3. The entire production line is automated and equipped with fewer personnel.

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