You may not have heard of PET injection molding, but you must have used its products: mineral water bottles, cosmetic packaging, medical devices... These daily necessities are inseparable from it. PET (polyethylene terephthalate) is a kind of high-performance plastic, with high transparency, good strength, recyclability and other advantages, become the "star material" of the plastic processing industry.
Industry data:
By 2023, the global PET market is expected to exceed $40 billion, with an annual growth rate of 5.2%.
China is a big producer and consumer of PET, accounting for more than 35% of the global market share.
Two, the four core links of PET injection molding processing
1. Material selection: food grade, medical grade, ordinary grade, you use the right?
Food-grade PET must be approved by the FDA to ensure that it is safe and non-toxic.
Medical grade PET is more demanding, requiring biocompatibility and high temperature resistance.
2. Mold design: A good mold is half the battle
Mold design directly affects product appearance and performance.
Shape - dependent cooling technology can shorten cooling time and improve production efficiency.
3. Process parameters: "golden triangle" of temperature, pressure and time
Temperature control: The melting temperature of PET is usually between 260 ° C and 280 ° C.
Pressure adjustment: holding pressure too high will lead to internal stress, too low may produce shrinkage.
4. Post-processing: Make the product more perfect
Dehumidification and drying: the moisture content of PET materials should be controlled below 0.02%.
Annealing treatment: eliminate internal stress, improve product stability.
3. Common problems and solutions
Problem: The product has bubbles or silver stripes
Cause: The material is not sufficiently dry or the temperature is too high.
Solution: Use dehumidification dryer, control the heating temperature.
Problem: Product deformation or shrinkage
Cause: uneven cooling or insufficient holding time.
Solution: optimize the mold cooling system to extend the holding time.
Problem: The surface is not smooth
Reason: mold surface rough or injection speed too fast.
Solution: Polish the mold, reduce the injection speed.
Fourth, the future of the industry: intelligent and green
Intelligent upgrade
The intelligent injection molding machine can monitor the temperature, pressure and other parameters in real time through sensors, and automatically adjust the process to reduce human error.
Case: After an enterprise introduced the intelligent system, the yield increased by 15% and the production cost decreased by 10%.
Green Trends
Regenerative PET (rPET) technology is mature and can reduce carbon emissions by 30%.
Policy support: The European Union requires that the proportion of recycled material in PET bottles be no less than 30% by 2030.
Development of high-end applications
Automotive: PET composites are used to make lightweight parts.
Electronics industry: High flame retardant PET is used to make mobile phone cases and chargers.
PET injection molding processing is not only an important part of the manufacturing industry, but also a key force to promote the development of environmental protection and science and technology. In the future, with the continuous progress of technology, PET injection molding processing will bring more innovations and breakthroughs.
HUIWEN Plastic, more than 20 years of high-end brand precision injection molding customization service provider, and has won the transformation and upgrading demonstration enterprise, the title of national high-tech enterprise, not only has 5 injection molding factories, injection molding mold factories in Vietnam, in the domestic Dongguan, Guangzhou and other places also has 7 factories, to provide a full range of one-stop plastic mold processing, metal processing customization services. Welcome to visit us.
ZIBO HUIWEN Plastics offers a full range of plastic molding capabilities to efficiently mass-produce parts specializing in injection molding and have served customers in variety of industries such as medical, automotive, packaging, construction, home appliances , and agriculture. The company has two factories which occupy a total area of more than 18,000 square meters, and a total of 102 sets of injection molding machines .
COmpetitive products:
3.500+ Material Choices Custom Injection Molding
