e Film 2--PA / aPE Three-layer Co-extruded Blow Molded Water-cooled or Air-cooled

日期:2020/1/17 10:00:36 / 阅读: / 来源:本站

.2 Production Example of Co-extruded Composite Film 2--PA / aPE Three-layer Co-extruded Blow Molded Water-cooled or Air-cooled Composite Film
Machine direction is 70.56 / 99.96N / mmo
1 outline the practical test,
The structure of PAPE co-extruded composite blown film currently commonly used is three layers of PA / ad / PE (ad is the adhesive layer) and
PE / ad / PA / ad / PE five-layer two forms. In addition to the common features of the above PAPE composite film,
In terms of performance and use, it is true that there are different high tools. Resistive owner
Degree PA / ad / PE three-layer composite sea film, because the melting points of nylon and polyolefin are very different (such as PA is 20 ℃. PE is
115 ° C), so it is especially suitable for heat sealing of sealing and welding packaging machines using the melting point difference.こ roro = 1E.0
PE / ad / PA / adPE composite film, with nylon layer sandwiched between it, can avoid the curling of different layers of materials.
At the same thickness, PE / ad / PA / ad / PE film has better mechanical properties and barrier properties than PA / a / PE.
Co-extruded composite blown film with PAPE, divided into two types of production methods: upper air blowing and lower water cooling
formula. Since nylon and polyethylene are crystalline polymers, the crystallinity, tensile strength, and elongation of the film vary with the cooling rate.
Elongation and turbidity are also different, and the effect on transparency is particularly significant. The turbidity of water-cooled films is generally about 3% to 6%.
Right, the air cooling method is about 13% to 30%, and both methods are currently used. Number of sound reinforcement (O) th
Ordinary graded screw can be used for nylon extrusion, but nylon resin generally has high viscosity, so it is better to use mixing effect
Abrupt screw with compression ratio of 4 to improve extrusion stability. Title of 3A King B
PAPE co-extruded composite blown film is mostly combined with center feeding in-mold compounding and center feeding or side feeding
In-mold compound head. Recording performance from the main district
PAPE composite film uses nylon 6, nylon 6, 66, 11, 12 and copolymers, nylon 6 is commonly used, and its grade is selected
Depends on use and processability. Both medium and high viscosities can be considered from the application point of view, but from the viewpoint of processability, nylon is a kind of easily decomposed
The crystalline polymer has a melting point close to the decomposition temperature, so the processing range is narrow.
Good, so the viscosity of the homopolymer is generally selected. The melting point of the copolymer is 20-30 ° C lower than that of the homopolymer. Generally, the copolymer is selected to have a high viscosity.
The copolymer is softer than the homopolymer. Film formation by air cooling can reduce the curling of the film.
Different types and quantities of additives are divided into several grades. Nucleating agents can prevent the growth of spherulites and reduce the crystallinity of nylon.
While improving the transparency and softness of the film, the slip agent is a hydrophobic organic compound, which can be reduced by adding it to the polymer.
Water absorption of the film. Table 7-520 shows the grades and main properties of nylon resins used in Mitsubishi Chemical Corporation's PAPE composite film.
Nylon is easy to absorb moisture. When the moisture content of the resin exceeds 0.1%, bubbles will appear in the film, and the gloss will decrease accordingly.


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