Cautions for the Manufacture and Use of Plastic Bags
Release date:2019-09-18 15:45
Generally speaking, there are no completely environmentally friendly plastic bags, only some plastic bags can be easily degraded by adding some ingredients. That's degradable plastics. A certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biodegradants, etc.) are added to the production process of plastic packaging products, which can reduce the stability of plastic packaging and make it easier to degrade in the natural environment. Experiments show that most degradable plastics begin to thinn, lose weight, decrease strength and gradually break into fragments after 3 months exposure in general environment. If the debris is buried in garbage or soil, the degradation effect is not obvious. There are four shortcomings in using degradable plastics: firstly, more food is consumed; secondly, the use of degradable plastics products can not be completely eliminated; thirdly, due to technical reasons, the use of degradable plastics products can not completely solve the "potential harm" to the environment; fourthly, degradable plastics are difficult to return because of the special additives. Collection and utilization.
Food plastic advertising bags sometimes produce odor, so manufacturers will be compensated and complained by customers. So we must strictly control the quality in production. These odors are mainly caused by ink solvents, so what should we pay attention to?
Therefore, we should pay attention to the following when making composite packaging:
1. The design of printing pattern should choose less color and monochrome elements so as to avoid full-page printing pattern with solid background as far as possible.
2. When choosing printing ink, do not use printing ink with larger odor. Do not use high boiling point solvents containing impurities, such as tar benzene, mixed benzene and recovered solvents.
3. Don't use PS composite adhesive with high odor.
4. When compounding, the inner film material should be checked whether it smells or not, and PE film with filler should not be used as the composite inner substrate.
5. Make every effort to improve the printing speed, reduce the viscosity of printing ink as much as possible, reduce the amount of ink, keep the drying oven and workshop ventilated smoothly, and reduce the residual ink and ink solvent to a low level.
What are the hazards of plastic bags? The recycling value of plastic bags is low. In addition to the "visual pollution" caused by scattered in urban streets, tourist areas, water bodies, highways and railways, it also has potential hazards. Plastics are stable in structure, not easy to be degraded by natural microorganisms, and do not separate in natural environment for a long time. This means that if waste plastic garbage is not recycled, it will become a pollutant in the environment and accumulate continuously, which will cause great harm to the environment.
First, it affects the development of agriculture. The continuous accumulation of waste plastic products in the soil will affect the absorption of nutrients and water by crops, leading to crop yield reduction.
Secondly, it poses a threat to the survival of animals. Waste plastic products discarded on land or in water are swallowed as food by animals, resulting in animal death. Sheep like to eat oily residues wrapped in plastic bags, but often eat with plastic bags. Because the plastic they eat stays in their stomach for a long time and is difficult to digest, their stomachs are packed, they can no longer eat, they can only starve to death. Such things are common in zoos, pastoral areas, rural areas and oceans.
Third, waste plastics with landfill will not only occupy a large amount of land, but also the occupied land can not be restored for a long time, affecting the sustainable use of land. Waste plastic products entering domestic waste will not be degraded for 200 years if they are landfilled. Moreover, plastic bags with petroleum as raw materials not only consume a lot of resources but also can not be decomposed and buried underground, which will pollute the land and rivers. In addition, plastic bags themselves release harmful gases. In particular, cooked food, packaged in plastic bags, often deteriorates. The effect of spoiled food on children's healthy development is particularly prominent.