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How to check if food packaging bags are qualified

How to check if food packaging bags are qualified

2024-05-09

Packaging bags, as we all know, are there packaging bags for everything we buy. Do you know if the quality of packaging bags is qualified? 1. The appearance must not have defects such as bubbles, perforations, water marks, bulging, poor plasticization, and fish eye stiffness that hinder use. The deviation of specification width, length, and thickness should be within the specified deviation range. 2. The physical and mechanical properties include tensile strength and elongation at break, which reflect the product's ability to withstand tension during use. If this item is not qualified, food packaging bags (films) are prone to cracking and damage during use. 3. The hygiene performance includes evaporation residue (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, and decolorization test. Evaporation residue reflects the possibility of food packaging bags precipitating residues and heavy metals when encountering liquids such as vinegar, wine, and oil during use. Residues and heavy metals can have adverse effects on human health. In addition, residues can directly affect the color, aroma, taste, and other edible quality of food. 4. The degradation performance can be divided into photodegradation type, biodegradation type, and environmental degradation type according to the different degradation types of the product. The degradation performance reflects the ability of a product to be accepted by the environment after being discarded. If the degradation performance is good, the bag (film) will break, differentiate, and degrade on its own under the joint action of light and microorganisms, ultimately becoming debris and accepted by the natural environment; If the biodegradability is poor, it will not be accepted by the environment, resulting in "white pollution".How to check if food packaging bags are qualified

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Three cases of portable package design of fruit and vegetable

Three cases of portable package design of fruit and vegetable

2017-08-08

Nowadays, the proportion of fruits and vegetables in people's daily diet structure is rising, but at present, the fruit and vegetable packaging is rather crude in China's market, regardless of appearance or structure, it is difficult to stimulate consumers' desire to buy. However, with the increase of consumers' demand for fruits and vegetables, their demand for fruit and vegetable packaging is also increasing. Miniaturization, quality, transparency, greening and other characteristics have become the trend of fruit and vegetable packaging in the future. Therefore, when designing packaging for fruits and vegetables, packaging enterprises should give full consideration to consumers' exact demand for fruit and vegetable packaging, and make fruit and vegetable packaging have the characteristics of easy portability, easy opening, beautiful appearance, and environmental protection.

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An omni-directional solution for the sticker label in summer

An omni-directional solution for the sticker label in summer

2017-08-08

Beijing recently strange cool, air conditioning at night do not need to open the degree, move on the 40 degrees of high temperature of the partners, are you all good? Since July, tag Jun has shared with you all notices in the process of production and use of summer sticky labels. Today, report summary is coming. In a nutshell, today's collection is enough.

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What is high-density polyethylene

What is high-density polyethylene

2017-08-08

High density polyethylene (HDPE) is a white powder or granular product. Non toxic, odorless, with a crystallinity of 80% to 90%, a softening point of 125-135 ℃, and a usage temperature of up to 100 ℃; Hardness, tensile strength, and creep resistance are superior to low-density polyethylene; Good wear resistance, electrical insulation, toughness, and cold resistance; Good chemical stability, insoluble in any organic solvent at room temperature, resistant to corrosion by acids, alkalis, and various salts; The film has low permeability to water vapor and air, and low water absorption; The aging resistance is poor, and the environmental stress cracking resistance is not as good as low-density polyethylene. Especially, thermal oxidation can cause its performance to decline. Therefore, antioxidants and UV absorbers need to be added to the resin to improve this deficiency. High density polyethylene film has a lower thermal deformation temperature under stress, so attention should be paid when applying it. Development History A revolutionary progress has occurred in the field of pipelines in this century, which is to replace steel with plastic. With the rapid progress of polymer materials science and technology, the deepening of the development and utilization of plastic pipes, and the continuous improvement of production processes, plastic pipes fully demonstrate their excellent performance. Today, plastic pipes are no longer mistaken by people as "cheap substitutes" for metal pipes. In this revolution, polyethylene pipelines were highly favored and increasingly shone brightly. They were widely used in gas transportation, water supply, sewage treatment, agricultural irrigation, fine particle solid transportation in mines, as well as in fields such as oil fields, chemical engineering, and postal and telecommunications. Especially in gas transportation, they were widely used. HDPE is a thermoplastic polyolefin produced by ethylene copolymerization. Although HDPE was introduced in 1956, this plastic has not yet reached a mature level. This universal material is still constantly developing new applications and markets. As of the end of 2006, there were four sets of high-density polyethylene units belonging to China National Petroleum Corporation (CNPC), including Lanzhou Petrochemical High Density Polyethylene Unit, Daqing Petrochemical High Density Polyethylene Unit, Liaoyang Petrochemical High Density Polyethylene Unit, and Jilin Petrochemical High Density Polyethylene Unit. High density polyethylene is usually manufactured using the Ziegler Natta polymerization method, which is characterized by the absence of branched chains on the molecular chains, resulting in a regular arrangement of molecular chains and high density. This process uses ethylene as the raw material and oxygen or organic peroxides as initiators to initiate polymerization reactions in tubular or kettle low-pressure reactors. High density ethylene is an environmentally friendly material that can be recycled and reused when heated to its melting point. Note that plastic raw materials can be divided into two categories: "Thermoplastic" and "Thermosetting". "Thermosetting plastic" becomes a solidified state after being heated to a certain temperature, and even further heating cannot change its state. Therefore, products with environmental issues are "thermosetting plastic" products (such as tires), not "thermoplastic" products (such as plastic pallets note: pallets are called "clamps" in Hong Kong and Macao), so not all "plastics" are not environmentally friendly.

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CHENGTAI PRINTING

specializes in producing food plastic composite packaging bags

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