The production of flexible packaging can be divided into printing, compounding, tape-only3a main process. The printing process is the leading process in the production of flexible packaging. No matter in terms of equipment investment or production difficulty, the printing process is the most concerned production link. However, in view of the common problems and preventive measures in the printing process, there is a lot of talk. This is mainly aimed at the causes of the sword problem in the flexible packaging composite bag process and the measures on the demand side.Analysis of common problems in compound processAs the throat process in the production of flexible packaging, the compounding process plays a linking role in the entire flexible packaging production process. This process is also the place where the cost of direct raw materials is most concentrated. Therefore, the stability of the quality of the compounding process is directly related to the yield and production cost. high and low. Although the quality problems in the composite process are not as many as those in the printing process, once a quality problem occurs, it will cause greater losses. According to the author’s experience, the larger 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 some common problems in compound production. 1, glueThe glue thread problem is mainly caused by the following reasons: ① Too much dirt and impurities in the adhesive; ② The quality of the adhesive is poor, and the viscosity is not easy to control; ③ The amount of glue is too small; ④ The glue scraper is not cleaned up Wait. The corresponding solutions are: ① Use filter cloth to filter the adhesive;②Choose the appropriate adhesive according to the production needs; ③Choose the appropriate glue roller; ④Clean the squeegee frequently. 2, dry glueThe so-called dry glue means that during the compounding process, the glued surface is partially or completely not glued. In fact, this problem (especially the case where no glue is applied) is very easy to solve, as long as you always pay attention to the glue in the glue tank. The remaining amount and timely addition can be completely avoided. 3, white dots, bubblesThe main reasons for the white spots and bubbles are as follows: ①The amount of glue is too high or too low; ②The temperature setting of the oven is unreasonable; ③The temperature setting of the composite roller is unreasonable. In response to such problems, it should be controlled from two aspects: awareness to ensure a reasonable amount of glue, and the second is to set a reasonable oven and composite roller temperature. 4, poor peel strengthThe reasons for this problem are mainly in the following aspects: 1. The processing of raw materials cannot meet the requirements. ②The content of additives in the raw materials does not meet the standard; ③The amount of glue is not enough; ④The temperature of the composite roller is too low; ⑤The machine speed is too fast; ⑥The temperature of the curing room is too low. It can be seen from the reasons for the appeal: the quality of raw materials, the amount of glue applied, the temperature of the composite roller and the curing conditions will all have an impact on the peel strength. Therefore toiboliThe intensity control should also be adjusted from the above aspects. 5, unit size deviationIn the compounding process, if the unit size of the product is not properly controlled, it will bring a lot of trouble to the subsequent paper bag and slitting process. The reasons for the deviation of the unit size of the product are usually as follows: ①The tension setting is unreasonable; ②Machine failure, such as the speed of the coating roller is slower than the machine speed; ③The oven temperature is too high. Reasonable control of tension and oven temperature is the key to solving this problem. 6,tunnelThe tunnel problem is mainly caused by the mismatch of tension between the two composite substrates, so in the actual production process, different tensions should be set according to different composite substrates to match their tensions, so as to avoid this problem. problem arises. In conclusion, for the lamination process, material, temperature, tension and adhesive are the keys to guarantee lamination quality4Big critical control point. Therefore, in order to produce a good composite product, it is necessary to revolve around4work on each aspect.