Co-extruded composite film production example --5 layer co-extruded cast composite film
DATE：2019/11/14 8:45:27 / READ： / SOURCE：This station
Co-extruded composite film production example --5 layer co-extruded cast composite film
In this example, four extruders were used to produce a five-layer easily peelable composite film by co-extrusion casting, which was used as a cover film substrate for cup packaging such as jelly and yogurt.
1. Selection of raw materials
1) The heat-sealing layer (ie, the first layer) PE raw material is made of heat-sealing layer PE special materials, such as L-3388 of Japan Alizarin Co., Ltd., PEID625 and APPEEL1181 of DuPont of the United States.
2) Composite layer (ie, layer 5) PE raw material, considering the need for co-extrusion processing and post-processing, using a heat-sealable resin.
3) The second layer and the fourth layer of PE raw materials are selected to be compatible with the first layer and the fifth layer of PE raw materials, such as a resin having an MFR of 7 to 8 g/min.
4) The third layer is the recycled trimming material.
In this four extruders, the extruder A extrudes the first layer of the heat seal layer PE, the extruder B extrudes the second layer and the fourth layer of the PE material, and the extruder C extrudes the third layer to recover the cut. The edge material, extruder D, extruded the fifth layer of composite layer.
2. Art conditions
The main process conditions are: total film thickness, (55 ± 2) μm, heat seal layer thickness of 20μm, extruder processing temperature of 180 ~ 230 ~ 235 ° C, melt temperature of (235 ± 5) ° C, cooling water The temperature was (22 ± 1) ° C, the corona treatment current was 21 A, and the winding tension was 29 N.
3. Film properties
The film composite layer is corona treated and its surface tension is not less than 40 mN/m. When the heat seal layer and the cup are heat sealed, the heat seal strength is generally not less than 4.5 N/cm.
In this example, four extruders were used to produce a five-layer easily peelable composite film by co-extrusion casting, which was used as a cover film substrate for cup packaging such as jelly and yogurt.
1. Selection of raw materials
1) The heat-sealing layer (ie, the first layer) PE raw material is made of heat-sealing layer PE special materials, such as L-3388 of Japan Alizarin Co., Ltd., PEID625 and APPEEL1181 of DuPont of the United States.
2) Composite layer (ie, layer 5) PE raw material, considering the need for co-extrusion processing and post-processing, using a heat-sealable resin.
3) The second layer and the fourth layer of PE raw materials are selected to be compatible with the first layer and the fifth layer of PE raw materials, such as a resin having an MFR of 7 to 8 g/min.
4) The third layer is the recycled trimming material.
In this four extruders, the extruder A extrudes the first layer of the heat seal layer PE, the extruder B extrudes the second layer and the fourth layer of the PE material, and the extruder C extrudes the third layer to recover the cut. The edge material, extruder D, extruded the fifth layer of composite layer.
2. Art conditions
The main process conditions are: total film thickness, (55 ± 2) μm, heat seal layer thickness of 20μm, extruder processing temperature of 180 ~ 230 ~ 235 ° C, melt temperature of (235 ± 5) ° C, cooling water The temperature was (22 ± 1) ° C, the corona treatment current was 21 A, and the winding tension was 29 N.
3. Film properties
The film composite layer is corona treated and its surface tension is not less than 40 mN/m. When the heat seal layer and the cup are heat sealed, the heat seal strength is generally not less than 4.5 N/cm.
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