The quality of food packaging bags in the flexible packaging industry, especially the quality of hygiene, is directly related to the safety of the packed foods. Therefore, it is necessary to ensure that the raw materials and additives used meet the quality management system.
The industry and national standards for packaging film bags must be improved and strictly enforced. Inspection and supervision of food packaging should be strengthened to prevent unqualified food packaging from entering the market and strengthening management so as to ensure the healthy development of the flexible packaging industry.
The inspection items for food packaging single-film bags are mainly divided into the following categories:
Appearance must not be adverse to the use of air bubbles, perforation, water lines, violent tendons, poor plasticization, fish eyes deadlock and other defects.
Specifications, width, length, and thickness deviations should all be within the specified range.
Physical and mechanical properties include tensile strength and elongation at break, which reflect the ability of the product to stretch during use. If this item is not qualified, the food packaging bag will be easily broken or damaged during use.
Hygienic properties include evaporation residues (acetic acid, ethanol, n-hexane), consumption of potassium permanganate, heavy metals, and decolorization tests. Evaporation residue is a reflection of the possibility that food packaging bags will precipitate residues and heavy metals when they are in the process of using vinegar, wine, oil and other liquids. Residues and heavy metals will have adverse effects on human health. In addition, residues will directly affect the color and fragrance of food. , taste and other food quality.
The degradation performance can be divided into photodegradation type, biodegradation type, and environmental degradation type depending on the degradation type of the product. Degradation performance reflects the ability of the product to be accepted by the environment after being discarded. If the degradation performance is good, the bag will break, differentiate and degrade spontaneously under the joint action of light and microbes, and eventually become debris, accepted by the natural environment; If the degradability is not good, it will not be accepted by the environment, resulting in "white pollution."
The inspection items for food packaging composite film bags are mainly divided into the following categories:
Appearance should be smooth, no scratches, burns, bubbles, oil breaks and wrinkles, heat seal formation, no false seal. The film must not have cracks, pores, and composite layers separated. No impurities, foreign matter, grease and other pollution.
Bags of soaking liquid shall not have odor, odor, turbidity and decolorization.
The physical and mechanical properties include tensile strength and elongation at break, which reflect the ability of the product to withstand stretching during use. If this item fails, the food packaging bag will be prone to cracking and damage during use.
In addition, it also includes gas barrier properties such as gas permeation, oil resistance, heat resistance, cold resistance, and medium resistance; the peel strength of bags, the pressure resistance and drop resistance of bags, etc. These indicators reflect the The reliability of the inner packaging protection.
Hygienic properties include evaporation residues (acetic acid, ethanol, n-hexane), consumption of potassium permanganate, heavy metals, and decolorization tests.
It should be pointed out that China's food packaging materials in addition to the above-mentioned corresponding health standards, there are two laws and regulations: First, "The People's Republic of China Food Hygiene Law", the second is "food plastic products and raw materials management approach."
The content of the Food Sanitation Law is more comprehensive than the management method. It is a comprehensive law, while the latter is professional. It refers only to plastic products and raw materials. The scope of management is limited to various plastic food utensils, containers, production pipes, and transportations that come into contact with food. Packaging materials made of strips and plastics and synthetic resins and auxiliaries used therein. The so-called plastic tableware refers to plastic products such as spoons, spoons, chopsticks, etc. that are used for a short period of time but are used repeatedly. The so-called window refers to barrels, bottles, pots, cups, and other plastic products containing food. The so-called production pipeline refers to the process of food processing, especially the liquid food or beverage flowing through the pipeline, it should also include storage and irrigation. The so-called conveyor belt refers to the carrier that transports the food raw materials to the processing equipment, and the packaging materials refer to the monolithic and composite bottles, barrels, trays, roll films and bags, wherein the roll film packaging cling film, the cover film and the Bag film. All manufacturers of food flexible packaging and composite packaging materials should strictly implement this management approach.
The processing of plastic film bags must go through the process of heating, and the plastics have problems of cracking, oxidation, degradation, and deterioration when they are heated. Therefore, when processing plastic films or bags with resins, add antioxidants to the resin. Heat stabilizers and other additives. Some packaging film bags also require antistatic, anti-condensation, and high-slip due to the packaging process and mechanical or content requirements. Therefore, additives such as antistatic agents, anti-fogging agents, lubricants, and opening agents must be added. All of these additives are first tested by GB15139 "Food Safety Toxicology Evaluation Procedure" to prove that they can be used without toxicity, but there is also a limit to the amount of added substances. Therefore, in the product, these low-molecular-weight substances that can be extracted, that is, evaporation residue, or something that can be oxidized and degraded, that is, the consumption of potassium permanganate cannot exceed the prescribed amount, and cannot be used if it exceeds the prescribed amount. . Therefore, there must be corresponding sanitary standards for molded products. The purpose is to prevent the abuse and abuse of additives. It is better to ensure that the materials that are directly packaged and contacted with food have a high degree of hygienic safety performance.
