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 Wysłany: Sob 2:36, 01 Sty 2011 Temat postu: moncler jackets sale The composite extrusion compo |
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The composite extrusion composite mechanism and process control
Of. Improve the crystallinity of PE, not only can prevent the collection of modern plastics processing application of section 42, No. 3 l0 reduction, and improved PE and other materials, the peel strength adhesive. Compound in the extrusion, generally used in the curing temperature of 40 ~ 55 ℃, when the same 24 hours. 4 out of composite materials used 41PE PE melt flow rate (MFI: I】 industrial use MFR to indicate the size of PE molecular weight directly affects the size of the force between polymer molecules, and molecular material also decided to ask the cohesive force energy level. So PE either as hot melt material or as a coating material, the MFR are affecting the peel strength. generally used in the MFR is 4 ~ 8g/10min the coating level PE. PE of the PE melt can also explain MFR When the MFR the higher liquidity,[link widoczny dla zalogowanych], PE melt flow better,[link widoczny dla zalogowanych], to be stuck in the permeability of the surface film, spreading the better, to improve the adhesive strength, it should be flexible according to the requirements of different structures, selection of appropriate The MFR42PE non-polar molecule PE drying, moisture absorption rate is very low, less than 0.05%, but because of its aggregates in the storage and transportation process, easy to produce static electricity, the water adsorption in the air,[link widoczny dla zalogowanych], often resulting in excessive moisture content When the water content of more than 0.05%, the hand although do not feel the presence of water, but often result in PE and other materials, peel strength decreased significantly, or even result in decreased strength of PE's seal, sealing the state was poor . when the water content is large, there will be out of the PE melt mesh, and issued a \composite production, should take pre-drying. drying temperature of 5O ~ 80 ℃. drying time for the l-hour. 4E antioxidant material used in the PE grades, be sure to use free of antioxidants. because the thermal oxidation , antioxidant free radical elimination of the thermal oxidation, and these free radicals is the thermal oxidation process are necessary. 5 Conclusion The mechanism of the extrusion composite, process control and PE materials used in the discussion, the following conclusions can be drawn . a high-temperature melt extrusion to the surface of thermal oxidation of PE, resulting in polarity, while the PE melt has sufficient liquidity, permeability and diffusion. b in the control PE extrusion temperature, the time should be made out of PE film surface to take a small amount of smoke, necking is not obvious and more difficult to smell the paraffin smell and settings. e quench increases the PE amorphous regions can be improved adhesion of PE. should be based on PE melt body for different purposes, select the appropriate cooling temperature d. composite pressure is reduced and sticky adhesive surface of the molecular film to ask the distance to improve their peel strength. to be glued under the films with different adhesive properties, select a different composite pressure . e in the complex out of Taichung,[link widoczny dla zalogowanych], to avoid excessive film tension by f, aging increases the crystallinity of PE, eliminating stress, promoting the curing chamber revolves agent to control the MFR g.PE materials within a certain range, It can improve the peel strength composite film. and should be used without antioxidants PE. h when the water content of raw materials, large PE. to take pre-drying. LAMINAT10NTHEORYANDTECHN0L0GI (LCONTR0LINEXTRUSl0NLAMlNAT10NTangJiangunang (WenahounouSoftPackagingFactory) ABSTRACTTheextrusionlaminationtheoryandthermaloxidizationtheoryofpolyethylenesurfacewereintroduced, ac-cordingtoexampleofextrusionlaminationofpolyethylenemelt.Theseleclionofpolyethylenematerial , thecon-trolofextrusiontemperature, laminatingp ~ essure, ccolingtemperature, tension, curingtemperatureandtime, ectwered1scussedindetailKeb-, vords: extrusionlamination; adhesion; thermaloxidization; PE
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