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Multi-layer co-extrusion cast film production process and application

Temperature, requires a moisture-proof packaging aluminum compound paper. And during transport to ensure the integrity of packaging; conditions of the manufacturers to install CPP composite pellets class LDIE, LIDIE, metallocene LLDPE, MJ required range of values from 2 to 8. melt extrusion good performance, good sealing performance. (3) the size of the bond strength of adhesive materials co-extruded film directly affect the quality circle This,[link widoczny dla zalogowanych], according to the different barrier materials and complex sets of highly adhesive materials used sticky resin accounted for, the MI in the 2 to 6 words. 3, production process quality control in the amount of raw materials are guaranteed under the premise. production process is controlled the key to product quality, including temperature, line speed, thickness control. stratification diversion control surface treatment. (1) melt extrusion temperature control must select the appropriate temperature,[link widoczny dla zalogowanych], and he finished aggregate base plastics extrusion, or Film}: there will be crystal defects such as point stripe. plasticized for various materials at different temperatures, so the materials should be selected with the squeeze Ke Chuan temperature. but to pay attention to the feet. processing temperature is too high PA, EVOII or PVDC degradation occurs,[link widoczny dla zalogowanych], the product turn yellow. because the melt strength and melt viscosity are closely related, in the multi-layer co-extruded, it can melt away when adjusting the temperature, so close to the viscosity of various materials, easily layered for a more uniform layer preparation repeated. casting film casting temperature on the membrane mechanical properties, optical properties. sealing performance have an effect. The higher the temperature the better the physical and mechanical properties, optical properties and heat sealing the worse performance the lower the temperature, the worse the physical Sapporo mechanical properties, optical properties and heat seal the better the performance. (2) multi-layer hierarchical control structure split by a shunt layer implementation. 备 species after the melt through the shunt will be arranged in the necessary structure to make it balanced out. through - layers in shunt valve section of the opening and the degree of flow can Xinjiang prepared basically the same flow rate to ensure that the production of co-extruded film layer is good. If the regulator appropriate. 备 layer velocity is relatively large. may produce vortex k, Yan Bi of layering. China Packaging 2005/597 (3) production line speed, thickness control prepared by weighing worthy of extrusion speed and the calculated production rate. by controlling the extrusion speed and production rate to achieve the thickness of each layer as early as t cross-section of cliff f control of sentence by the thickness of the control system of online direct feedback to the die head, adjust the die lip opening adaptation, the film thickness of the formation. (4】 Surface Treatment Depending on the needs of multi-layer co-extruded cast film is also playing with the aluminum, polyester film composite require corona treatment the surface layer,[link widoczny dla zalogowanych], the surface tension to 38mN / m to I.. to ensure the rehabilitation units produced - a solid degree of 4, the product structure and classification of high barrier multi-layer co-extruded cast film from the structure can be divided into two categories, namely symmetrical structure A / B,[link widoczny dla zalogowanych], C / BA and non-account structure, said C / B / AA for the resumption of Taiwan Village material. Xun sticky} B share materials. C Goyang separated materials such as regular l1] of the symmetric structure of PE / Tie / PA / / EVOl1, Tie / PE, PE / | rie. PVDC / q'iePE so I used the I} symmetrical structure PA/T1e/PE, PA / Tie / PP, PA, EVO11/TiePE and so on. 5 products Majesty with ten more by the repeated application of co-extruded high barrier tape blocks kinds of materials by extrusion molding children, the collection of the advantages of the small variety of materials. so they have a very good performance, can be widely applied to various types of food packaging (1) high barrier and high barrier multi-layer co-extruded Paul fragrance cast film of oxygen, water vapor barrier effect through a good, special project is the choice of EVOH ~ I] PVDC as the barrier material, the oxygen transmission rate, water the amount of steam through the Ministry of H + months was lower than the requirements to play a barrier for both Hj, to prevent outside air, water entry, the fork can be a good packing material to maintain the original flavor and quality, can significantly extend the shelf life of goods. widely used in dry meat frozen products, cooking of meat food products (2) oil resistance, soluble organic high power multi-layer coextrusion cast every m there is a strong oil film resistance, organic soluble, can be widely used edible oil , fast food, anti-rust metal products, machinery parts packaging. (3) Good moisture barrier impermeable layers coextrusion cast watertight 』share good moisture resistance, can be used for wine, dairy products, soy sauce and other liquid food packaging. In addition. Mu Rong framed with high mechanical strength, puncture resistance properties, compound printing adaptability. and good sealing performance. very beneficial to stem production should】『_ lChina Packaging 2005; 5

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