Because the amount of glue applied in the production of high temperature resistant cooking bags is much greater than that of ordinary bags, the glue coating should be uniform. According to the characteristics of different manufacturers and different types of glue, the amount of dry glue that can withstand 121 ℃ temperature is ≧ 4.5 ～ 5.0g / ㎡, the peeling strength of half-high temperature cooking bag before cooking should be ≧ 3.5 ～ 4.0N / 15mm, in order to meet the requirements of national standard GB / T10004--2008 standard.
Different equipment and different post-processing and content, composite technology and various parameters are also different. If the heating and ventilation performance of the compound machine drying tunnel is not ideal, the speed should be slower to facilitate the maximum evaporation of the solvent, reduce the solvent residue, and ensure product quality.
Determine the appropriate machine processing parameters, especially the oven temperature is 5 to 10 ℃ higher than the production of ordinary products , the temperature of the composite heating laminating roller can be controlled at 70 to 80 ℃, so that the initial adhesion and final strength of the composite film are both Good. The compound pressure is increased by 0.1 ～ 0.2MPa compared with common products of the same specifications.
The selection of the initial tension and taper of the rewinding is determined according to the type and specifications of the material, subject to moderate rewinding tightness and no wrinkle of the film. During production, the glue in the glue tank is best circulated and filtered with a pump , and the viscosity is often measured with a 3 # Zahn cup to ensure that the glue concentration is basically the same, and finally to ensure the stability of the product coating quality.
The thickness of each layer of the high-temperature cooking bag must be uniform, and the thickness deviation should not exceed 7%. In addition to the mechanical performance parameters of AL foil products, the AL surface should be dry, and the cleanliness must reach the A and B standards. The storage time before use should not exceed three months. In order to enhance the compound fastness, the BOPA compounded in the middle should be a double-sided corona , and the corona value should not be less than 52-54 dynes, and the RCPP should be 40-42 dynes.
Generally, the texture of the glue roller should be softer, because the depth of the mesh of the glue roller pressed into the net is larger than that of the hard roller, so the amount of glue extruded from the mesh is large, so the final transfer amount is many. The high pressure will deform the roller body, the glue is squeezed out from both ends, the amount of glue on both ends is small, and the amount of glue on the middle is large. The concentricity of the anilox roller and the parallelism of the doctor blade should be consistent, otherwise it will cause uneven glue application.
According to the characteristics of glue, some adhesives require layered and segmented composite curing, and then complete the final curing according to the required curing time. However, there are also many adhesives that can be put into the curing room after the multilayer multilayer compounding is completed, and the final curing is completed according to the curing time required by the glue.
The advantages of layered aging are stable quality, reducing the effect of compound wrinkling of high-temperature resistant cooking bags, and you can also check whether the appearance of compound products has white spots; the benefits of one-time completion are high production efficiency and easy management, but there are Hidden quality wrinkles. It is recommended that the aging process is compounded after compounding, and the quality will be guaranteed relatively high.
Author: Chen Mengjie
Shenzhen Guang Disen Furniture co.,ltd , https://www.gdisenfurniture.com