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Nylon Standard

Flexible Packaging Industry In China Will Work With International Standards

Food can be roughly grouped into packaged food and non-packaged food categories. Non-packaged food is relatively safe, at least not add preservatives like substances.

In the absence of the refrigerator age, food is basically unable to spend the night, particularly in the Guangdong region, did not eat the horse down, this phenomenon of food terminology to describe the use of packaging is the "short shelf life."

In addition to use of its packaged food packaging blocking the entry of oxygen, the food still in the packaging sterilization. Minimal amount of harmful bacteria, coupled with no biological need an atmosphere of packaged foods can be extended shelf life. As for how long to maintain the period, based on the packaging of the oxygen barrier property, and whether to add preservatives to decide. Such as packaging cakes generally use nylon composite film, do not add preservatives moon shelf life will not exceed 15 days, if stored for one year with preservatives are not degenerate. But now the food industry on the use of preservatives, there are strict requirements.

Speaking of food to be sterilized in the packaging, sealed sterilization can prevent bacteria from re-entering, but the bags are cooked along with them, it is necessary to take into account the dissolution of materials in packaging. Packaged food materials composite membrane dissolution testing, including evaporation residue, the amount of potassium permanganate, water pumps, heavy metals, such as 2-amino toluene content. In fact, all the utensils and food contact materials have to do the dissolution test, such as for food processing, cooking spoons, chopping block, as well as chopsticks, spoons, knives and forks and other cutlery, various types of full bloom of food utensils, packaging bags naturally also includes the included.

Evaporation residue was packaged by 4% acetic acid solution, 65% ethanol, n-hexane heat soak, dissolution of the solid material after drying, evaporation residue are complicated, only the calculation of the total dissolved material. Heavy metals also used a 4% acetic acid solution immersion, inspection Diaminotoluene use of 100 ℃ water content is actually boil 1 hour.

Evaporation residues and potassium permanganate consumption of the chemical composition and film-related; heavy metals, 2-amino toluene content and inks, adhesives have a certain relationship. The earlier children's toys, food had been packed colorful, but later found the heavy metals contained in paint on children's development, especially the intellectual development of an impact on Europe and the United States first made a provision of heavy metals. China's management of export commodities, food, business-to-ink, paint also made a similar request. For example: New Oriental brand of super-strength polyurethane composite Fu, milk membrane sheet printing inks are in SGS and other world-famous company to do the inspection.

Adhere to environmental protection needs of self-concept, corporate social responsibility has gone beyond the purpose of the enterprise. Diaminotoluene where they come from? Polyurethane Adhesives are used in domestic aromatic diisocyanate, the cause of the benzene ring of the urethane bond hydrolysis will produce 2-amino toluene, so it's testing method is 100 ℃ boiling water.

This material, according to Americans that there is suspicion of cancer, of course, the suspect was not sure, or already are not allowed to use. China's August 1, 1994 implementation of GB/T14937-94 "composite food packaging bag diaminotoluene determination", the provisions of diaminotoluene minimum detectable concentration of 0.002mg / L. To reduce the hydrolyzate diamino toluene, 2-for-use aliphatic isocyanates on the line, unfortunately not produced domestically, imported high price. To promote food safety, must pay the cost, only the downstream co-operation enterprise capacity to work.

Described above the contents of the many small color printing factories do not know, because they do not even solve the problem of residual solvents in production of inks, adhesives company has introduced environmentally-friendly products for color printing plant to choose between natural prices but also with the traditional varieties have gained a fight. Introduction of alcohol-soluble adhesive in plastic (undetected diamino toluene), water-based glue; ink introduction of benzene in a ketone, benzene-free ketone species.

Basically, the direction of development of domestic and foreign simultaneously, but to achieve food security purposes, color printing plant to improve their technological level is still the key. If you can not control the residual solvents, residual benzene there is no alcohol, there is residual water-based ink used in water, bags of quality are not guaranteed to talk about what environmental protection. Unfortunately a lot of color printing plant that used benzene ink, water-based glue to resolve the issue of residual excessive, process without changing the equipment do not improve. Domestic food packaging standards though not complete, there is still a gap between the indicators and Europe and the United States, but if the strict implementation can greatly enhance the packaging industry level.

AQSIQ through the plastic for food packaging, containers, tools and other products in the market access for review of issuance of production licenses, so as to enhance the importance of SMEs to enter the industry as a review of the national standard based on these standards to improve the authority and the implementation of the scope. Access to review highlights the residual solvents requirements: that the total amount of ≤ 10 mg, also stressed the residual ≤ 2 mg of toluene. This standard is both transitional (and eventually prohibit the use of toluene), another to ensure food safety because the toluene residue had been contained in a safe range.

At the same time the standard more in line with the status of the domestic packaging industry: domestic use the largest and only chlorinated polypropylene BOPP printing ink, the so-called "universal type" less than ideal performance of the total, while the oxidation of polypropylene ink is the main solvent toluene; the current PU printing ink, or use more varieties of benzene. So now a ban on the packaging gravure ink solvent benzene is not realistic.

But the packaging materials to the direction of environmental protection is to determine the trend, the New Oriental Ink Group has launched the ultra-Li Fu-3300NT benzene-containing ketone polyurethane ink, also introduced in Europe (resin) system, super-strength fu 303FD-F benzene-free ketone composite ink, these species are synchronized with the international fashion products.

BOPP Ink R & D of alternative varieties of relatively large degree of difficulty, but the New Oriental Ink Group has also made efforts to market a high as 421 alcohol-water-type white ink to see if the name does not know benzene is suitable for printing BOPP film. Taking into account the product transition, alcohol and water-based white ink trapping in the current commonly used in color ink on the effects of chlorinated polypropylene is also good. The next step will be available alcohol-water-based color ink goal is to completely replace the oxidation of benzene in polypropylene ink.

Adhesives industry is no industry standard and no national standard, only the implementation of corporate standards. Gravure printing ink standards do not take into account environmental protection requirements. China Daily Chemical Industry Association of Printing Ink Branch in cooperation with the State Environmental Protection Administration, organized the compilation of national environmental protection industry standards - "offset printing ink, gravure ink, and flexible printing ink environmental labeling product technology requirements", and in November 2007 promulgated in February 2008 formally ink the implementation of environmentally friendly products in this industry-standard preparation, collected the views of representative enterprises, concentrated the wisdom of professionals embodies all of the development of the industry's expectations. This standard ink toward environmental protection in China play an instructive role, but also marks the beginning of China's food packaging standards into a new period of integration and internationalization.
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