The preparation before compounding determines the smoothness of the whole compounding process, and its importance can be imagined. But the operator may often ignore this process. This article summarizes the key points of the two links that affect quality in the compounding process, for the industry's reference.
Compound quality control process: preparation before the restoration-confirmation of the first article-inspection during production-self-checking off the machine-curing
1. Preparation before resuming
Before compounding, glue, solvent, qualified rollers, common tools, production instruction sheets, process cards, screen rollers, and composite materials should be prepared. After all materials are fully prepared and the equipment is operating correctly, production begins.
1. Problems that may occur in the preparation process
â‘ The glue ratio is wrong;
â‘¡Use the wrong glue model;
â‘¢ The amount of glue is not enough;
â‘£The pressure roller is eccentric or the bearing is not flexible enough;
⑤ Material breakage occurs after receiving the material;
â‘¥ Abnormal oven temperature;
⑦The tension of each tension section is unstable.
2. Suggestions before preparation
The captain must arrange the work, especially check the important preparations before starting the machine, such as the proportion of glue, whether the glue is filtered, whether the compound scraper and glue pump can work normally, etc. These must be personally supervised and executed And keep an eye on the preparation process.
2. Mid-natal inspection
This link mainly checks the compound knife line, the amount of glue on the glue, the viscosity of the glue, re-deflection, wrinkles, etc.
1. Suggestions for the production process
Workshop supervisors and on-duty captains should earnestly implement the workshop management system, especially on-duty captains should do a good job of management and control on all kinds of potential problems in the first article and self-inspection, problems found, rapid development, timely resolution, and move Observe the operation of equipment and materials, check the product quality more often, and measure whether the product quality is qualified. It is recommended to place a constant temperature drying box in the workshop, and put the composite film off the machine into the set drying oven to bake, and simulate the curing function, which can effectively help us judge whether the composite quality after curing meets the quality requirements. Compound quality control points: less glue, knife line, white point, crystal point, peel strength, performance, process execution.
3. Self-checking
Some compound quality problems are not manifested during the compounding process, and they do not show up until the machine is off. This requires someone to be responsible for the quality inspection of the product after getting off the machine.
1. The method and items of self-checking off the machine
Sampling inspection is carried out immediately after the product is off the machine. Observe the appearance quality of the composite product, and check for bubbles, wrinkles, orange peel, etc. The specific inspection items are as follows.
â‘ Compound tunnels and wrinkles;
â‘¡Compound peel strength;
â‘¢ Spots, bubbles and ink between the composite layers;
â‘£The elasticity of both sides of the composite film roll;
⑤ Glue amount;
â‘¥Whether the bug reenters the membrane:
⑦Curl situation;
⑧Squeeze thickness;
⑨ Pattern deformation and unit size change.
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