Extrusion coating composite bonding device
DATE：2019/10/21 9:01:11 / READ： / SOURCE：This station
Extrusion coating composite bonding device
Generally speaking, the pressure roller for extrusion coating is a rubber roller with a diameter of 100 to 200 mm. If the width of the substrate film is smaller than that of the T-die of the melted resin, it can be adjusted by the amplitude modulation rod. The width is larger than the width of the T-die to prevent the melt from sticking to the rubber roller. The hardness of the pressure rubber roller is generally 80 to 85 in terms of hardness, and the soft pressure rubber roller of less than 70 is prone to wrinkles, curling, filming, and delamination. For low-strength and high-elongation film processing such as cellophane and plastic film, it is not suitable to use a rubber press roll that is too soft. A hard press roll of hardness of 85 or more is not able to obtain a uniform film, and it is easy to cause wrinkles of the pinch roll. When not producing a sandwich composite, but only producing a substrate on one side of the melt extrusion coating film, in order to prevent the adhesion of the melt to the pressure roller rubber, generally the surface of the pressurized rubber roller is made of non-stick fluoroplastic or silicone. rubber. In order to prevent the pressure roller from being deteriorated by heat, shrinkage, deformation, etc., the surface temperature of the pressure rubber roller should be kept below 0 ° C, and the inner cooling groove is passed through the cooling water. Both the cooling roll and the cooling idler are used to provide a uniform pressure and a cooled surface on the surface of the pressurized rubber roll. The maximum pressurizing pressure is 15 kg/cm2, and both the cooling idler and the cooling roll are metal rolls.
The large cooling roll is a roll for cooling the extrusion-coated composite film, and the melt-extruded composite resin film can be peeled off from the smooth surface of the cooling roll, and the optimum peeling temperature is 30 ° C or less. The cooling roll should be rotated for one week to cool the composite film to below 30 ° C for easy peeling. The lower limit of the surface temperature of the cooling roll is that water droplets which cannot be condensed on the surface of the cooling roll are generated, that is, cannot be below the condensation temperature of the ambient humidity. Allowable temperature errors at both ends of the chill roll
Around 1 °C. The diameter of the cooling drum used in the soft plastic packaging is 300-600 mm, and the position between it and the die of the extruder is controlled by the air gap distance. The length of the air gap is related to the performance of the melt-coated film: when the sandwich is produced When the sandwich is extruded into the melt-flowing composite film, the two substrate films should be corona treated and the AC agent should be applied under the primer. In order to improve the composite fastness, the air gap should be larger and the oxidation degree should be higher, so that the molten extruded film is the same. The bonding fastness between the two substrate films is good. If the heat seal layer is only extrusion coated on the surface of the substrate film, it should be squeezed twice. One extrusion at 315 ° C, and the air gap is large, in order to increase the degree of PE oxidation, thereby improving its composite fastness to the substrate. Another time, the heat-sealed PE layer is squeezed at 160 ° C, the air gap is smaller, the oxidation degree is reduced as much as possible, and the heat seal strength is improved.
Generally speaking, the pressure roller for extrusion coating is a rubber roller with a diameter of 100 to 200 mm. If the width of the substrate film is smaller than that of the T-die of the melted resin, it can be adjusted by the amplitude modulation rod. The width is larger than the width of the T-die to prevent the melt from sticking to the rubber roller. The hardness of the pressure rubber roller is generally 80 to 85 in terms of hardness, and the soft pressure rubber roller of less than 70 is prone to wrinkles, curling, filming, and delamination. For low-strength and high-elongation film processing such as cellophane and plastic film, it is not suitable to use a rubber press roll that is too soft. A hard press roll of hardness of 85 or more is not able to obtain a uniform film, and it is easy to cause wrinkles of the pinch roll. When not producing a sandwich composite, but only producing a substrate on one side of the melt extrusion coating film, in order to prevent the adhesion of the melt to the pressure roller rubber, generally the surface of the pressurized rubber roller is made of non-stick fluoroplastic or silicone. rubber. In order to prevent the pressure roller from being deteriorated by heat, shrinkage, deformation, etc., the surface temperature of the pressure rubber roller should be kept below 0 ° C, and the inner cooling groove is passed through the cooling water. Both the cooling roll and the cooling idler are used to provide a uniform pressure and a cooled surface on the surface of the pressurized rubber roll. The maximum pressurizing pressure is 15 kg/cm2, and both the cooling idler and the cooling roll are metal rolls.
The large cooling roll is a roll for cooling the extrusion-coated composite film, and the melt-extruded composite resin film can be peeled off from the smooth surface of the cooling roll, and the optimum peeling temperature is 30 ° C or less. The cooling roll should be rotated for one week to cool the composite film to below 30 ° C for easy peeling. The lower limit of the surface temperature of the cooling roll is that water droplets which cannot be condensed on the surface of the cooling roll are generated, that is, cannot be below the condensation temperature of the ambient humidity. Allowable temperature errors at both ends of the chill roll
Around 1 °C. The diameter of the cooling drum used in the soft plastic packaging is 300-600 mm, and the position between it and the die of the extruder is controlled by the air gap distance. The length of the air gap is related to the performance of the melt-coated film: when the sandwich is produced When the sandwich is extruded into the melt-flowing composite film, the two substrate films should be corona treated and the AC agent should be applied under the primer. In order to improve the composite fastness, the air gap should be larger and the oxidation degree should be higher, so that the molten extruded film is the same. The bonding fastness between the two substrate films is good. If the heat seal layer is only extrusion coated on the surface of the substrate film, it should be squeezed twice. One extrusion at 315 ° C, and the air gap is large, in order to increase the degree of PE oxidation, thereby improving its composite fastness to the substrate. Another time, the heat-sealed PE layer is squeezed at 160 ° C, the air gap is smaller, the oxidation degree is reduced as much as possible, and the heat seal strength is improved.
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