Discussion on solving the problem of no wrinkle in packaging bag glue In solvent-free compound production

 Discussion on solving the problem of no wrinkle in packaging bag glue In solvent-free #compound production, the #glue of #packaging bag is not used and wrinkle is a common and difficult problem affecting product quality. Through practical observation and analysis, this kind of problem involves multi-link factors, which need to be solved from the dimensions of process, equipment, environment and other dimensions, and the following combined with the actual production situation are discussed. First, glue does not wrinkle the cause of analysis (1) unstable glue ratio and supply Solvent free glue is prepared by a and b components according to a specific proportion, and the production is unstable, uneven coating and uneven mixing, which will make the proportion imbalance. For example, the fluctuation of glue supply, the output quantity of a and b components is often more and less, and the initial viscosity and curing characteristics of glue after mixing are changed. In addition, the consumption change and parameter fluctuation of glue on the composite layer in production will also interfere with the ratio, weaken the peel strength of the product, and directly cause the glue to do not work when serious. (ii) the glue mixing and the transportation system jam The parts of the mixing pipe, cylinder, adhesive head, static mixing pipe and filter mesh are easily blocked due to glue residue and impurity accumulation. Blockage will destroy the stability of glue flow, so that the glue is insufficient, the glue coating is not uniform. Like static mixing pipe, glue cannot be effectively mixed in it, and components a and b cannot blend evenly. Coating them on the packaging bag. (3) influence of environmental temperature and humidity The temperature and humidity of the workshop have a significant effect on glue curing. When the humidity is high, nylon absorbs moisture, the curing agent in the glue meets the water consumption, the curing is not sufficient, and the non-problem is frequent; Low temperature or uneven distribution, such as the composite film core, side, bottom temperature difference is large, local heat is insufficient, glue solidifies slowly or even does not, the packaging bag will wrinkle when heated. (4) lack of curing conditions and operating specifications Low curing temperature and insufficient time are the key. Generally, the curing temperature of solvent free glue needs to be adapted, the temperature is not enough, and the molecular crosslinking reaction is difficult to fully; The curing time is short, such as the curing time of boiling bag and aluminum foil cooking bag is not up to standard (no less than 48h and 72h respectively), and the glue is not dry and easy to do so. At the same time, workers are not standardized to operate, such as casually changing glue, mixing proportion control poor, will also artificially aggravate the problem. Ii. Targeted solutions (1) stabilize the supply and proportion of glue Select high quality solvent free glue and use it fixed to avoid frequent changes to trigger characteristic fluctuations. Optimize the glue mixing equipment, ensure the glue mixing machine to stabilize the glue supply, accurate glue mixing, with the help of advanced control system, real-time monitoring a and b component flow and proportion, dynamic adjustment, to ensure the uniformity of the glue. In production, we pay close attention to the changes of glue consumption and parameters, fine-tuning in time, maintaining stable proportion, and reducing the incentive of non-interference from the source. (ii) optimize the mixing and conveying system Regularly comprehensively clean the first key parts of the mixing pipe, rubber cylinder and glue, formulate cleaning cycle and specifications, thoroughly remove residual glue and impurities with special cleaning agent, and prevent blockage. For static mixing pipe and other easy parts, timely replace according to the frequency of use, ensure the efficiency and effect of glue mixing, let the glue mix fully before coating, improve the curing quality. (3) accurately control the temperature and humidity of the environment Install temperature and humidity monitoring and control equipment, and monitor workshop environment data in real time. When humidity is high, turn on the dehumidifier and control the humidity in a reasonable range (generally 40%~60%); When the temperature is low, the temperature can be raised by heating device (such as workshop heating, equipment preheating), and the temperature can be distributed with the help of temperature (such as circulating fan), so that the temperature of the workshop and composite equipment is uniform, for glue curing to create an appropriate environment. (4) specification of curing operation and process Strictly implement the curing process standard, according to the type of packaging bag (ordinary compound bag, cooking bag, etc.), accurately set the curing temperature and time, with the help of intelligent temperature control and timing equipment, to ensure the stability of curing conditions. Strengthen worker training, standardize operation process, clarify glue replacement, mixing ratio adjustment and other operation approval and implementation requirements, reduce human error. (5) optimization of special parts (such as sealing edges) In order to avoid wrinkles, the method of mixing and coating is improved. Auxiliary device can be installed at the glue head (such as small mixing cavity, buffer parts), so that glue can be fully mixed before reach the sealing edge, buffer again, avoid the glue head swing, residual pressure, etc., make the glue proportion imbalance after direct coating. It can also optimize the design of the mixing pipe, adjust its swing range and stop position, ensure that the glue is fully mixed and evenly coated in the sealing edge area, and improve the curing effect of this part. Iii. Summary and continuous improvement To solve the problem of packaging bag glue does not raise wrinkle, it is necessary to plan the process, equipment, environment, operation in many aspects, from the cause of accurate policy. In practice, the effect of continuous follow-up measures should be continuously followed, product quality data should be collected regularly, and the problem should be analyzed whether the problem is recurrent and improved. At the same time, encourage workers to feedback production abnormal, combine experience exchange, technical research, constantly optimize the scheme, form a standardized production process, long-term guarantee packaging compound quality, improve product market competitiveness.

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