Food packaging safety, food sack odor to solve the problem

The peculiar smell of the plastic bags can lead to food odoour, even will affect food quality, harm people's health. Especially strict food packaging of peculiar smell, chocolate, milk powder, wafer, cookies, chips, etc of these requirements are especially sensitive to smell. Countries are now the smell of food packaging is also very seriously, the related standard step by step, not only need to conform to the requirements of the country, food itself also requires packaging material from raw material to finished product must meet the international requirements. Influence the residual solvent in the production of packaging and printing process corresponding measures often used in a variety of diluted solvent for printing ink, is in order to improve the printing ink printing adaptability, improve the printing ink transfer intensity, make print products more color is rich, full, image is clear. Ink transfer printing to a variety of thin film, printing ink solvent will gradually evaporate, ink and then curing, if take the lead to curing ink surface, will hinder the internal solvent volatilization, effective, the phenomenon of the solvent will be released completely, namely we belong solvent residue levels of a residual solvent smell, affect the packaging material. Ink drying time is directly related to the length and the boot speed. Boot speed if beyond the right technical requirements, it will cause the ink curing in the thin film surface, and can't get a full internal solvent volatilization, especially if the final is a set of color color piece, you need to keep the last set of full color dry, otherwise it will cause too short distance between the winding unit, have not been volatile solvent residue in the film roll of internal problems. Printing process, according to the base material to select different kinds of printing ink, printing choose to use different kinds of ink will be at the same time using different solvents. Due to the diversity of printing design, design can be monochrome blocks, can also be composed of many colors, or even more than ten kinds of color, the design of packaging printing factory now mainly in the majority with six, eight kinds of color, each color of ranging from 1% to 100%, so they asked for the amount of solvent evaporation are significantly different. If in the production speed and air volume, temperature match not appropriate, just early will appear all sorts of different solvent residual problem. And in dry weight load, because of the different amount of glue, from 3 grams per square meter to 6 g has different requirements, the production of adhesive viscosity also have different requirements, the evaporation of the solvent effect also have very big distinction, if the process parameters set is not reasonable, it is easy to excess solvent residue problem, in production and complex processes, and residual solvents closely linked factors are: the production speed and drying oven, drying oven temperature, ventilation rate, adhesives Ink) The concentration and solvent content, glue ( The ink) Dry, environment temperature and humidity conditions. So we must strictly control the process conditions and continuous tracking record to find the best process conditions. Composite process and measures to solve the influence of dry composite processing if the operation error, temperature control, also can make plastic packaging produce peculiar smell, we can take the following measures to control, to ensure our products to reduce or eliminate peculiar smell. 1. Choose and ink that meet the needs of a two-component glue, solvent smell also need compound requirements, do it after finished product without irritating smell. 2. For the gluing quantity control to must be strictly implemented, large amount of glue or glue line is too thick, will make solvent evaporation is not sufficient, lead to excessive residual solvents. 3. Dry compound machine speed, matching of viscosity and adhesives to make adhesive is fully dissolved in the solvent, and cleanliness of adhesive must guarantee, there can be no impurities, otherwise uneven coating, affect the volatile solvent, make each solvent evaporation. 4. Set of dry compound machine temperature oven paragraphs, tracking speed, setting temperature, good paragraphs usually at about 70 ℃, 80 ℃, 90 ℃ advisable, tracking the exhaust air volume adjustment paragraphs oven at the same time, set the exhaust air of accurate, fully effectively ruled out film. 5. After the composite curing, curing time and temperature should be controlled well, curing time is 24 - commonly 28 hours, temperature at about 45 ℃, the curing incomplete will not only produce peculiar smell, will seriously affect the peel strength. At the same time, to ensure that the curing chamber intake and exhaust flow. Inner heat sealing materials produced by thermal decomposition and oxidation of peculiar smell and solutions while the raw material of inner heat sealing materials itself without other peculiar smell, but in the process of machining, he added a variety of modified materials, additives and its thermal degradation will produce unpleasant smell, including ink, paper board, caramel flavor, sweet taste, and even disgusting odor, etc. One of the most prominent is the smell of the PE membrane degradation, in modern packaging, inner heat sealing layer most use polyethylene materials, and also be direct contact with the content of polyethylene. It when it is heated in the process of machining will be broken down into various saturated or unsaturated polymer compounds, including many short branched chain compounds produced a great influence on the content of the packing materials smell. After extrusion die head and polyethylene will oxidizing reaction with oxygen in the air, produce material also has a great smell. Must, therefore, before the product structure design to smell out all kinds of raw material choice, choose to product smell affect small material combination and matching.
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