The hottest tea beverage drives the development of

Tea drinks drive the development of hot filled PET bottles

Pet (polyester) drink bottles have only developed in China for more than 10 years, while hot filled pet drink bottles have a shorter history in China, only about 4 years, but the momentum of development is stronger than most other packaging containers. This momentum is mainly due to the rapid development of tea drinks. As we all know, tea drinks and fruit juice drinks are the hot spots of beverage development. In China, the output of tea drinks in 2000 has exceeded 1.5 million tons, and most of the packaging containers are filled and bottled with pet, and the proportion has a growing trend

Lu Huancheng, deputy general manager of Zhuhai Zhongfu industrial group company, said that the production principle of pet hot filling and bottling is: PET beverage bottles (usually injection molded into bottle blanks) → after heating, the bottle blanks are stretched longitudinally → horizontally → blow molding. The final molding in this production process adopts mechanical cold setting. However, PMMA has the following main limitations: high hardness, difficulty in measuring intraocular pressure after implantation, and uncomfortable initial wear, which requires a long time to adapt; The adhesion of epidermal cells is poor, which can not form a continuous corneal long skin, and there is a risk of latent infection, leakage and corneal lysis after operation; Low oxygen permeability type. Therefore, once the temperature of PET bottle reaches the glass transition temperature (78 ℃), its molecular chain will relax and the bottle will shrink seriously. Therefore, this kind of bottle is only suitable for cold filled beverages

President Lu believes that the hot filling bottle is always at a high temperature (about 140 ℃) in the stretching and shaping process of the above process, and the PET molecular chain is shaped at high temperature in a loose state. Finally, a large number of neat and dense crystals are produced in the bottle body, with a crystallinity of 30% - 45%, which makes the bottle have high heat resistance and become a practical hot filling bottle

one blow mode. Expand the utilization of aluminum in new energy vehicles, special vehicles, transportation vehicles and other fields, that is, during the process of bottle from bottle blank to molding, only one blow molding process is carried out, and the method is to heat the mold to 100 ~ 180 ℃. When the bottle blank is stretched and blown to the shape of the bottle mold, the heat setting knot 1. Regularly check whether there is oil leakage at the host and oil source. The crystallization process will last for several seconds to more than 10 seconds. The characteristics of this method are: the equipment is relatively simple, the cost is low, and after replacing parts and components, ordinary PET bottles can be produced; Small floor area; Since the bottle will be heated directly on the mold, the heat energy consumption is small. The disadvantage is that the heating treatment temperature is lower than the secondary blowing method, the crystallization degree is slightly lower, and the heat resistance is also slightly poor, and the heat resistance temperature is 85 ℃ ~ 90 ℃; Bottles must be heated and cooled, which increases the time of production cycle. At present, the production equipment of one-time blowing mode in China is mainly the equipment of France Sidel company and Italy SIPA company

secondary blowing mode. The second blowing method is to blow the bottle blank to a larger volume (about twice the bottle capacity), Then heat to 20 "At present, it is about 0 ℃, and then let it shrink and blow molded into the final bottle shape again. The characteristics of the second blow are: the advantages are that due to the higher temperature of heating treatment, the crystallization rate is correspondingly improved, and the heat resistance can reach 90 ℃ ~ 95 ℃; because the heating treatment process can be carried out independently, it can achieve higher production efficiency. The disadvantages are that the machine is large and complex, the price is high, the floor area is large, and the energy consumption is high. The second blow At present, the equipment is mainly provided by Japan's Nissei ASB Machinery Co., Ltd

President Lu pointed out that in the past, for fruit and vegetable drinks and tea drinks, in order to achieve a longer storage time, first, add an appropriate amount of preservatives, but in the era of advocating green food, it is obviously becoming more and more inappropriate; The second is to use glass and metal containers to contain these drinks, and then use high-temperature cooking process to sterilize, so as to extend the storage period. However, due to the bottle shape design, safety, transportation and other problems of glass containers, and the shape design, opacity and other problems of metal containers, their promotion has been greatly limited. The emergence of pet hot filling and corresponding hot filling technology has solved these problems. Therefore, pet hot filling and bottling has been rapidly promoted and applied

source: Shanghai kelao mechanical equipment Co., Ltd