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Multi-layer co-extrusion blow molding process characteristics of composite membrane and application of


Subkey resin itself has many good properties,[link widoczny dla zalogowanych], such as good optical properties, oil resistance, solvent resistance, heat sealing, gas barrier, water blocking and so on. 3. Barrier materials, barrier materials is to determine the quality of co-extrusion composite film critical materials. It has to take into account the requirements of the packaging put, we must consider the material thickness and the economy. The material commonly used in the following categories: PA or PA copolymer, the transparency of the material better. Gas barrier is very good, but in the three-tier structure, co-extruded composite films, due to the structure and the polyolefin materials quite different subjects (such as LDPE / ionic bonding resin / PAe). To produce the film produced curling phenomenon. But the PA. In the five co-extruded with the structure, the effect is very good, but also more economical. EVOH: This is a newly developed polymer. Can not be produced in China now, as the materials and PVDC gas barrier with a strong performance, than the PA 30 to 50 times higher, but the material can easily absorb moisture, mechanical properties are poor, but also very sensitive to heat, it is generally only put in the middle to use, and the layer of mold should be designed to flow well streamlined to avoid extrusion processing residue in the flow channel in Table 2 is the penetration of some of the common coefficient of resin. Multi-layer co-extrusion blow molding process as shown below: Head of a country, one head of a Kids in Kids in one country, one steam table 2OzC0 material g · mmm · 24h · barm · 24h · barm · 24h · barEV0H0.040.120PVDC0.04O . 120PANO. 441.22.4PA2.34.72.4PET4.48.01.6HDPE44】 200.2PP901800.2PC1902904.7 the whole process does not seem complicated, and often used in China now is similar to extrusion blown film process. It is for these reasons, so the technology has developed rapidly in foreign countries, with information on. Japan between 1987 to 1990, co-extrusion composite membrane at a rate of 8 per year, which is packed with plastic film is the fastest growing one. And this technology and processing methods can also be easily accepted. Film generally used for quality control center console control, including: through the extruder screw speed and the actual melting material into the extrusion die to be thin the amount of control and the total thickness of each layer thickness control; by the traction speed traction device back to the center console to control the total thickness; produced by the co-extrusion composite membrane thickness monitor back to the center console, to achieve pre-set film thickness control. In addition, the width of the body of a control film. Out of the film through the width of the monitor. To control the addition of compressed air. So as to achieve the purpose of automatic control of film width. In addition to these uses, co-extrusion blow molding composite metal membrane can also be used in some bags. Can be made to agriculture, big films, big films stronger than ordinary single-layer high, but also add some additives later. Longevity made great films, no film drops a large gate, absorbing infrared greenhouse film, especially for covering a longer growing season, late maturity, such as plant herbs,[link widoczny dla zalogowanych], ginseng, very good. In short, multi-layer co-extrusion composite film a wide range of applications, some application areas needing development. That the product due to its simple process, easy to grasp, low-cost finished products, combined with good performance and wide range of applications and many other advantages, prospects in the country will look very impressive. * Multi-layer co-extrusion film Huan plastic composite structure and the application of several characteristics of the main uses of the table structure can be color LDE door DPE, porous seal milk,[link widoczny dla zalogowanych], parcels, general packaging LDPE / EvA easy to heat sealing, the aseptic heavy packaging, medical supplies HDPE / EVA can be sterile, easy sealing serum, plasma, bread, food HDPE / LDPE High Intensity bear boxes, poultry products, not so clean hoop fruit Pei A ... LDPE / HDPE / LDPE both sides of the seal is good, not curling, high strength,[link widoczny dla zalogowanych], EVA / PP / EVA Ibid colleagues. EVA / HDPE / EVA ditto the products, sausages, dairy products, frozen meat, pressure packing, LDPE / adhesive resin / PA blocks or gas barrier, high strength, military maple packaging, food and so on. EVA / Resin fools Hop / PAe ditto LDPE / ~ combined resin / PAs / sticky structural balance, do not curl good barrier, closing above table refers to the tree / LDPE mouth strength LDPE / ~ co-tree refers to the / PA / bullock barrier good sealing, high strength, mechanical units above the tree fl ~ / LLDpE (HDPE) good 56/I992Vo1.72N0.3CHINAPACKAGING

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