As a throat process in flexible packaging production, the compound process plays a role in the whole process of flexible packaging. This process is also the place where the direct raw material cost is the most concentrated. Therefore, the stability of the composite process quality is directly related to the yield and production cost. High and low. Although the quality problem in the compounding process is not as great as in the printing process, if there is a quality problem, it will cause a large loss.
According to the author's experience, the large quality loss is caused by the wrong use of raw materials. Therefore, the correct use of raw and auxiliary materials is a key factor in quality control in the composite process. Here are a few common questions in the production of composites (mainly dry and extrusion).
Rubber wire
The problem of glue is mainly caused by the following reasons:
Too much dirty impurities in the adhesive;
The quality of the adhesive is poor and the viscosity is not easy to control;
The amount of glue applied is too small;
The squeegee is not cleaned, etc.
The corresponding solution is:
Filter the adhesive with a filter cloth;
Choose the right adhesive according to the production needs;
Choose the right rubber roller;
Always clean the squeegee.
Dry glue
The so-called dry glue means that in the compounding process, the glued surface is not partially or completely glued. In fact, this problem (especially all cases where the glue is not applied) is very easy to solve, as long as the glue in the glue tank is always paid attention to. The remaining amount can be avoided by adding it at the right time.
White dots, bubbles
The causes of white spots and bubbles are mainly the following:
The amount of glue applied is too high or too low;
The oven temperature setting is unreasonable;
The temperature setting of the composite roll is unreasonable.
In response to such problems, we should control them from two aspects:
One is to ensure a reasonable amount of glue;
The second is to set a reasonable oven and composite roll temperature.
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Guangzhou Vantee Electronic Technology Co., Ltd. , https://www.finerroller.com