Single-layer plastic film due to the limitations in performance , can not meet the requirements of the development of packaging technology , now widely used on the market a variety of composite films , ie first by a substrate , such as "BOPP, NYLON, POPET, cellophane , etc. " After printing again after the composite layer and multi-layer film made ??of composite films entire process is done by plastic color printing plant. Existing complex process, process more loss, and more investment in equipment , environmental pollution, poor health indicators shortcomings . The experts of the world's developed countries, the ongoing revolution against these situations composite film processing technology , and has made ??gratifying achievements . The so-called pre- composite composite film that itself has completed processing the composite color printing plant as long as the printing and coating, slitting it.Now make some explanation on several pre- composite packaging materials on the market.First, start from the first sealing materialComposite film is basically a composite inner polyolefin materials with heat sealing properties. However, many of the packaging of the product does not require such a large seal strength , there is a need in the foreign market composite film on the inside of the seal , " print" a layer of hot melt adhesive . Example , 40u BOPP / print + hot melt adhesive sealing of the painted ;Second, another method is to produce a composite material can be heatFor example : BOPP / pre- coated with glue or heat sealing layers. Printed on the printing BOPP or PET, through heated rollers can not require curing compound , can be directly processed .Third, after sealing transformed by the " cold seal "Due clamshell packaging to the small packaging requirements of certain commodities great speed , and can not be heated , such as chocolate packaging. Overseas development of a composite film can be cold seal . It is understood that the printing process is also completed . Inner sealing layer is similar to one kind of stickers, general stickers but not sticky .Finished in plastic trays high-speed packaging machines , add some pressure in the seal can be sealed , can greatly improve the packaging speed.Fourth, pre- coating process composite filmsIn order to reduce the plastic composite plant investment recently issued a plant substrate with a film coating of the film composite preform , I estimated that in the near future , can be mass produced .These composite membranes in general in the production of pre-coated substrate production factory is completed. Finally, the composite film in color processing factory, and does not require complex equipment , as long as the printing packaging design press will be able to complete the final work of the composite film , the key is to increase the printing brightener according to the user's requirements on the press plastic packaging , anti-friction agent, temperature , antistatic agents , matte like. Some places have been some tests. For example , commonly used products PET12 u / printing / foil / modified polyolefin can be used for fruit milk covering film . Aluminum foil / foil surface coating material in print and then printed layer temperature brightener, cost savings improve product stability.V. Finally, a large seal strength composite film is started from the sealing material.Currently , the inner sealing film having a high heat seal strength tends to develop thin , high-strength special materials. In this regard , many reports on manufacturers , such as high plastic box temperature resistance, cooking polypropylene , metallocene polyolefin particles , modified acrylic polymers, ionic resins and the like , are not repeated here . Has been developed abroad , in the country has just started , if you want to develop , you need color printing factory , film base plant , inks, adhesives and other raw materials plant concerted efforts to communicate with each other to be successful . At present, the production has been co-extruded multi-layer film manufacturers to provide a good seat , especially in some narrow film production factories, because they can not be compared with those of high-speed , wide large enterprises , research and development production of various multifunctional pre plastic case composite film is a good project .Sixth, the development of some foreign factories can give some domestic film factory reference.I found during inspection in Chicago , formerly known as American technology company is a manufacturer of narrow QPF BOPP film professional factory specially developed in order to survive the attack can be one of the most prominent films plastic package of Ping is a high seal strength aluminum vacuum BOPP film .EVA film which is made ??of blown film machine , the EVA film BOPP film production process after extrusion through longitudinal tensile parts fit up, then pull the device into horizontal cross made ??of high tensile strength BOPP sealing film , and then vacuum aluminum finalize aluminum vacuum heat sealable BOPP film , I think this is a typical pre- composite films .VII SummaryThe total of the pre- composite film has a broad development prospects, especially in China's energy shortage , the current composite plastic packaging film printing production processes in the plastics processing scrap two big losses , environmental pollution and health performance packaging materials are has a great influence . Recommendations for vendors discussion about this issue associations , so that our pre- composite films have a larger development.

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