All-weather pvdc multi-layer co-extrusion blown film unit
A multi-layer co-extrusion and blown film technology, applied in the field of machinery, can solve the problem of inability to apply PVDC film, and achieve the effect of shortening the heating time and uniform heating
Active Publication Date: 2018-05-04
丹东全德高科技包装有限公司
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Problems solved by technology
[0002] Existing co-extrusion blown film units, such as the structure disclosed in Chinese Patent Application No. 200910010378.9, cannot be applied to the production of PVDC films. This is because PVDC, whose scientific name is "polyvinylidene chloride", is a kind of Non-toxic, tasteless, safe and reliable high-barrier material, in addition to the general properties of plastics, it also has the characteristics of oil resistance and corrosion resistance, and can be widely used in food packaging and other industries
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[0013] The present invention is specifically described below in conjunction with accompanying drawing, as Figure 1-Figure 2 As shown, it includes multiple extruders 1, air ring 2, traction unit 3, counter roll 4, mold 5, winding device 6, etc.; Connected flow channel, the flow channel collects different materials to form a circular material layer with uniform thickness, which flows towards the heart, fits layer by layer in the shaft, moves from bottom to top, and finally forms a multi-layer structure, which is extruded from the upper lip. Then it is blown and cooled to form a film; the PVDC extruded layer 203 is provided with a plurality of flow channels 2031 connected to the extruder, and the plurality of flow channels 2031 form a spiral shape at the center.
[0014] like image 3 As shown, the flow channels of PE, EVA, PA, and PA binders adopt a labyrinth flow channel with no dead ends, divided into two, divided into four, and divided into eight.
[0015] like Figure 4 ...
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Abstract
The invention discloses an all-weather PVDC multi-layer co-extrusion blown film unit, which includes multiple extruders, air rings, traction units, moulds, winding devices, etc.; The flow channel connected to the exit of the extruder, the flow channel collects different materials to form a circular material layer with uniform thickness, which flows towards the heart, and is laminated layer by layer in the shaft, moving from bottom to top, and finally forms a multi-layer structure. The lips are extruded, and then blown and cooled to form a film; the PVDC extrusion layer is provided with multiple flow channels connected to the extruder, and the multiple flow channels form a spiral shape at the center. The advantages of the present invention are: adopting multiple PVDC extruders for plasticization, so that the PVDC is heated evenly, and the heating process is greatly shortened compared with a large-scale PVDC extruder, so that the PVDC can be formed through a large-diameter runner mold. This type of flow channel realizes the PVDC co-extrusion film with a diameter of 2000mm; in addition, a temperature adjustment layer is set to meet the processing temperature requirements of different materials.
Description
technical field [0001] The invention relates to the field of machinery, in particular to a co-extrusion blown film unit. Background technique [0002] Existing co-extrusion blown film units, such as the structure disclosed in Chinese Patent Application No. 200910010378.9, cannot be applied to the production of PVDC films. This is because PVDC, whose scientific name is "polyvinylidene chloride", is a kind of Non-toxic, tasteless, safe and reliable high-barrier material, in addition to the general properties of plastics, it also has the characteristics of oil resistance and corrosion resistance, and can be widely used in food packaging and other industries. [0003] Philip Kwok, Steve Jenkins of Dow Chemical Company, and Joseph Dooley of Brampton Engineering Company disclosed the following in their paper "New Process for Processing High Barrier PVDC": PVDC can withstand 6-8 minutes of heating in the range of 150-170 °C time, and at 210-220°C, the withstand time is less than 3...
Claims
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IPC IPC(8): B29C47/06B29C47/56B29C47/14B29C49/04B29C49/22B29C48/305
Inventor 须建
Owner 丹东全德高科技包装有限公司