The advantages and disadvantages of various materials beverage bottles

Glass bottles can be reused and inconvenient to carry, but there are clear and unclear cross-contamination practices.
Plastic bottles, as opposed to glass, say that the permeability coefficient between oxygen and carbon monoxide is large, and it causes a chemical reaction between the packaged object and the package, and the packaged product is also oxidized and causes the taste to deteriorate, and the plastic The aging of products also affects the appearance quality, is not beautiful and practical, and pollutes the environment.
With the continuous application of new materials and new technologies, hybrid materials such as PC, PET, PEN, PET and PEN, and plastics represented by other new plastics such as PETG have appeared. What are their advantages and disadvantages?
PEN has good heat and gas barrier properties, can resist UV, can also withstand pasteurization and high temperature leaching temperature, its service life can be more than 6 months, light weight, but high cost, limiting the use of PEN .
The advantage of the PC is its ability to withstand high temperatures above 120°C, and its mechanical strength is large, but it is expensive and has poor gas barrier properties, and it has gradually withdrawn from the field of beer packaging. According to reports, there are now improved PCs that have been brought back to the market.
As a result, PET has emerged, but since it is not resistant to high temperatures, it is suitable for cold-sterilizing beer because the sterilizing beer uses a membrane filtration technology that is not pasteurized or flash-sterilized at high temperatures. However, the penetration of gas cannot be well hindered. Not only the carbon dioxide content is low, but also the cyanidation of beer is easily deteriorated. Therefore, its application is greatly limited. However, PET is the earliest developed, most productive, and most widely used polyester product.
PET can be easily obtained by rapid cooling method in the amorphous, highly transparent, easily stretched PET products, so as a packaging material, PET can be made into two-way stretch packaging film, but also non-performing preforms A high-strength, high-transparency stretch blow-molded bottle can be obtained, and can also be directly extruded or blown into a non-stretched hollow container.
PET film has the properties of transparency, oil resistance, fragrance protection, hygienic reliability and wide application temperature range (high temperature steaming and freezing packaging are all possible), especially stretched plastic bottle molding, among which the most widely used is tens of milliliters to 2 liters. Small bottles also have large bottles with a capacity of 30 liters.
In beverage packaging, its most successful applications were carbonated soft drinks (CSD) such as Coke, Sprite, etc. CSD bottles accounted for 1/3 of total PET bottles. In 1998 alone, PET bottles in China's CSD packaging accounted for 57.4%. As early as 1995, the amount of condiments used in Japan exceeded 30,000 tons, accounting for 13% of the total consumption of PET bottles. The data shows that the sales volume of PET bottles in Japan rose from 220 million to 250 million in 2000. In the five years from 1995 to 2000, PET bottles increased from 15% to 36%.
Germany generally adopts PET bottle blowing technology for beverages and beer products, with an instantaneous output of up to 1200 bottles/mold. Moreover, it has good environmental protection and energy saving features, and its production energy consumption is only 41% to 64% of the glass bottles. If it is further recycled, its energy consumption can be reduced by about 50%. If China's 2000 beer production exceeds 20 million tons as the base, approximately 25 billion to 30 billion beer bottles can be consumed (including recycling). Even if it is partially replaced, by 2005 China's PET bottle demand will reach 60. Up to 650,000 tons, unlimited business opportunities. Due to the poor heat resistance and gas barrier properties of PET, its application in hot canning and applications requiring high air tightness is limited.
To solve the problem of poor heat resistance, people have developed three types of practical heat-resistant polyester bottles through research; heat-setting new bottles can meet the requirements for 85°C filling; PET/PEN alloy bottles, PEN have high heat resistance, In the ordinary injection and blow blowing equipment can be made in accordance with the requirements of the hot tank above 80 °C bottle, if the heat setting treatment, hot filling temperature can reach 90 °C or more; with heat-resistant polyarylate and other multi-layer composite Bottles to improve heat resistance.
To solve the problem of poor gas barrier performance, the current methods mainly include three types: first, multi-layer composites, mainly PET, adding other airtight materials such as PEN to make 3-layer or 5-layer bottles, and second, special treatment Methods, such as coating epoxy barrier layer in PET bottle or outer layer, or plasma treatment; Third, using other barrier resin molding, using copolymer or blend of PEN or PEN and PET as raw material, both improved The chirality of the bottle also improves the heat resistance of the bottle, and it can also be alkali-sterilized and reused to reduce costs, because the first two methods have problems such as poor transparency, difficulty in recycling, complicated process, and special equipment requirements. Moreover, although the airtightness is improved, the heat resistance is poor, and it can only be applied to aseptic filling.
France's Sidel Packaging Co., Ltd. introduced the PEN blended material, which is a blend of 15% PEN and 85% PET, and after special processing, such as from the high temperature plasma to obtain amorphous carbon, and a trace of no Shaped carbon is incorporated into the materials used to make plastic vessels, which greatly increase the performance index, reaching almost the level of glassware and metalware, and its packaging performance is also better than glass bottles. The new process can increase the oxygen resistance of the bottle by 29 times and the barrier performance by 6 times.
At present, Zhuhai Zhongfu has developed a plastic that can replace glass bottles. It has light weight, high strength, good toughness, is not easily broken, and can easily be made into various specifications and shapes.