PET process of air permeable film production line

日期:2021/5/6 9:04:02 / 阅读: / 来源:本站

PET process of air permeable film production line

Air permeable film production line www.handern.com


The new process and technology of PET are developed to improve the barrier property of pet and the heat-resistant temperature of PET bottle. They are mainly as follows: first, heat setting of PET bottle: PET bottle with biaxial orientation should be heat set at 6065 "C. heat setting can improve the heat resistance of PET bottle and reduce the shrinkage of PET bottle during hot filling; It can also be heat treated at 160 ~ 220 "C for 20s, so that the treated PET bottle can be hot filled without shrinkage; Second, the performance of PET bottles can be improved by modifying the resin for PET bottles. For example, a kind of "super copolyester" has appeared in the market. The crystallization rate of this copolymer PET resin is quite slow, its barrier property can be increased by 7 times, and its moisture resistance can be the same as that of eval. The bottles produced by this new type of PET resin are especially suitable for oxygen sensitive and hot filling food. At present, the processing temperature of one kind of pet on the market is 12 ~ 15 ℃ lower than that of ordinary pet ° This bottle can be used for packaging mineral water which is especially sensitive to acetaldehyde content; Thirdly, coating treatment of PET bottle: the barrier property of PET bottle can be greatly improved by using PVDC and ethylene vinyl alcohol copolymer with high barrier property to impregnate or spray the PET bottle. Coating can be carried out in the blank stage, after drying, biaxial stretch blow molding, or after bottle forming. Japanese Regulations: containers for cool drinks must be heated at 85C for 30min without deformation. At present, PVDC coating is the main coating for PET bottles; Fourth, multi-layer composite PET bottles: PET bottles with two, three, and five layers have been developed. This kind of multi-layer composite PET bottles can be made from multi-layer coextrusion parison and then stretch blow molding, or from multi-layer co injection parison and then stretch blow molding. Through high barrier thermoplastic resin Eval and pan, through adhesive resin (e.g   Core, etc.) and PET resin composite coextrusion parison, such as:   PET / adhesive resin / PAN / adhesive resin / pet or pet  / Adhesive resin / Eval / adhesive resin / pet or PC / adhesive resin / evac / adhesive resin / PET are loose. When the thickness of this kind of bottle is the same as that of single-layer pet stretching bottle, the thickness of this kind of bottle is the same as that of single-layer pet stretching bottle,   The oxygen resistance can be increased by 2 ~ 3 times. Air permeable film production line www.handern.com
A new type of MXD6 nylon pet co extrusion bottle with thickness of pet330 was used μ m,   Mxde nylon is 20 μ m. Can make 350 μ The CO2 retention time (85% CO2 saturation retention value) of PET bottles increased from 15 weeks to more than 35 weeks. When 1 / 4L volume of pet is coated for 10 min μ When the thickness of PVDC is 1.5 m, the CO content in the bottle is from 10% to 85%   The storage time can reach more than 90 days at the same time.
P / adhesive resin / Eval / PC can also be used   PP / adhesive resin / Eval / adhesive resin / PP is used as the material of multi-layer bottle. It should be noted that PET bottles have some changes at 71c. Air permeable film production line www.handern.com
Lingvas chemical company uses multiple molds to produce mold blanks and continuous production of ml bottles by biaxial stretch blow molding. In 1986, the annual output of ml bottles was 10 million. Part of the company's equipment is used to produce bottles with multi-layer structure of PET / nylon MXD6 / PET / Museum MXD6 / PET for filling wine. Some large-scale carbonated beverage manufacturers use 15L ml newspaper to package carbonated drinks and drinks containing ethyl alcohol. Air permeable film production line www.handern.com
Compared with the previous PET single-layer bottle, jiamingfu can roughly increase the resistance of 0 and 0 gas, and the product will not reduce its transparency and strength, only need to reduce the transmittance of (Ni) MXD6, O, and CO by percent
It's also what the bottle doesn't want. Air permeable film production line www.handern.com

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