Selection of Adhesives for Food and Drug Packaging (5)

5 The quality is unstable. It is understood that many units newly put into production to sell adhesives have provided good quality and can be recognized when they provide samples to users. However, due to weak technical strength and low sales, it is often the case that raw materials are purchased in consideration of cheaper products. As a result, the quality of adhesives is variability, coupled with irrational process control and insufficient experience of production workers. However, off, there will be a difference in the appearance of the color of each batch of products, the viscosity of the glue, especially the internal quality, will cause the use of plastic units every time after entering a batch of goods are worried, afraid to go after the problem The well-made composite bags go out and are afraid of user complaints and claims. The ideological burden and pressure are great. In addition, there are individual manufacturers blending their own production of ordinary plastic and imported high-grade rubber, and then claiming to be their own production of high-end products, with a low price to occupy the market, which is very sad! Therefore, the use of plastic units to be selected through the investigation of long-term stable and reliable adhesive.
6 Misleading marketing. At present, some units that produce adhesives often use false components to mislead users in their product introductions. Two years ago, I read a partial article and said that his adhesive can make cook bags that are resistant to cooking at 180°C! Recently, I have seen some information on the properties of pressure sensitive adhesives that have been introduced into two-component polyurethane adhesives. Therefore, the adhesives exhibit strong one-component pressure-sensitive adhesive properties when composites are used. The surface tension requirement is not very strict, and it can be adhered at a slightly lower level. It also has a good effect on the composite of vacuum aluminum coating. Generally, no aluminum layer transfer occurs, and the peel force is still high. However, the adhesive film is not cross-linked and cured at all times, and exhibits stickiness at all times. Like the pressure-sensitive adhesive, the peeling force is reduced after two or three months and the resistance is poor. There is also some information in the promotion of non-benzene ink and alcohol-soluble adhesive, inappropriately put ethyl acetate is also included in the category of harmful toxic substances, over-exaggerated the advantages of alcohol-soluble adhesive, which is worth exploring. There have been recent reports that ethanol is oxidized to acetaldehyde by the enzyme after it is absorbed by the body. Acetaldehyde, like formaldehyde, is a carcinogen. Therefore, it is not absolutely safe to dissolve alcohol.
7 Hygiene and safety test items have not been fully discussed. Health and safety issues are very important, but they have not attracted enough attention from everyone. On the one hand, the glue unit has not yet regarded it as equally important as price, adhesive fastness, and patience. It was deemed dispensable. No one would check it, no trouble would occur, and it would be fine to pass it. On the other hand, the manufacturers and suppliers of adhesives did not use it as the main technical indicator. They think that everyone is producing and selling, and of course I can.
Many of China's adhesive producers and distributors and suppliers of imported adhesives have only conducted single tests of LD50, and have not conducted more comprehensive and strict "toxicological safety evaluation" tests. Strictly speaking, doing only one project of LD50 is not enough, because it is only a superficial phenomenon of acute toxicity. It does not know the potential, hidden and cumulative degree of harm, but only knows how many doses will receive 50% of the dose. Test animals should die, and then determine the degree of toxicity by referring to the acute toxicity dose classification according to the LD50 number. The degree of toxicity to substances in China is divided into six levels: To be more comprehensive and more rigorous, if you want to know whether it has potential harm, you need to do the second phase of toxicological safety tests, from genetics and variation. , Biochemistry, Histology, Hematology, Organ Dirty, Food Intake, Food Conversion, Growth Curve, etc. Checked, all have no problems, can be more assured to use, can be called a safety glue, rest assured glue ! In the seven problems mentioned above, the low solids content and the unsatisfactory packaging weight will only increase the cost of using adhesives. If the health and safety are not qualified, it will hurt the health of the consumers. This is very serious problem.
When selecting food packaging materials, food factories and drug manufacturers must strictly examine whether the raw and auxiliary materials (that is, the materials provided by your suppliers) of the packaging materials meet the safety and health requirements. This is the attitude towards the people and the society. .
IV. Suggestions 1. It is recommended that all units that manufacture and sell adhesives be responsible for the consumers and strictly abide by the provisions concerning the hygienic safety of packaging materials, and strictly control the purchase of raw materials, product formulas, and process control in order to achieve Production assured adhesive, sales assured plastic, so that everyone can use the adhesive.
2. The unit that manufactures and sells adhesives should focus on improving product quality, developing new varieties, and adapting to new requirements. Do not engage in plagiarism or duplication. Do not use brains in shoddy, use confusion, and do not sell at reduced prices. To engage in competition, we should work hard on quality, service, and technical support so that the overall level of the industry can be improved.
3, all plastic units, to establish raw materials into the library testing methods, the purchased adhesive according to the content of its product specification index analysis and inspection, qualified before entering the library, before allowing the use, do not wait until after the problem goes Test to avoid unnecessary losses.
4, to the right medicine, according to the use of the substrate, the final packaging of goods, packaging process conditions to be passed after the decision to determine which brand to choose, which model, what characteristics of the glue. Ordinary plastic / plastic compound on the use of cheap ordinary glue, aluminum / plastic or aluminum composite film on the use of special aluminum foil glue, acid and hot medium on the use of functional plastic, resistant to high temperatures above 121 °C on the use of cooking plastic Pesticide packaging will use pesticides. Do not blindly pursue the pursuit of cheaper procurement, or to adhere to the criteria of a one-price goods. Of course, high-grade rubber can be used in medium and low-grade products, but there are problems with oversizing and low cost. Low-grade adhesives, although they cost less, cannot be used in medium-to-high-end products. Therefore, we must use the principle of cost-effectiveness, choose to use the right medicine. (Finish)