Bags, as the name suggests, are bags that are used to hold items and are easy to carry. The function it carries determines its material and form. Based on the materials used, we can roughly divide it into: paper tote bags, plastic bags, cloth bags, small baskets and small baskets in a wide sense. The most common ones are the most frequently used paper composite bags and plastic bags, followed by cloth bags; the small baskets and small baskets are the least seen in metropolitan areas, and they are characterized by the fact that they are generally handicrafts, are expensive, and are not portable.
Paper bag
Most are heavy kraft paper, white cardboard, gray-white cardboard, white-white cardboard, and copper cardboard. After being printed by an offset printing press, they are die-cut, re-sticked, and formed. Due to the modernization of printing technology and equipment, the printing patterns are exquisite, exquisite, and rich in expression forms. All the techniques in modern printing can be represented on a small handbag, such as bronzing, bumps, UVs , die-cuts, and the like.
Because of the difference in materials, the stiffness and toughness of the kraft paper are good, the surface is rough, and the background color is generally not suitable for four- color printing, and only some single-color printing is not required, and the production cost is roughly the same. About 1.5 yuan (on the side). Kraft paper bag should pay attention to the use of better quality glue in adhesive molding, otherwise there will be the phenomenon of bottoming and bursting. Meanwhile, kraft paper bags hand-held place for too long the phenomenon will appear unglued.
White cardboard, gray white cardboard, white white cardboard and copper cardboard all have a common feature. The surface is delicate and white. It is suitable for four- color printing and can print very fine patterns, due to the paper itself. The characteristics of toughness and water resistance, usually we have to carry out film coating on the surface after printing ( BOPP film, also called biaxially oriented polypropylene film, we also call this kind of paper bag is a paper-plastic composite bag ), increasing its toughness and Water resistance, after the film-coated handbags generally do not appear degumming phenomenon, the production cost is roughly 1.3 - 2.0 yuan (following four colors), copper cardboard handbags the highest cost, followed by white cardboard handbags, gray White cardboard handbag, white cardboard handbag on white.
Plastic bags
According to the materials used, ordinary plastics and degradable plastics
Ordinary plastic bags we can be divided into BOPP (polypropylene), PE ( polyethylene) , LDPE (polyethylene), PET (polyester), PA (nylon), CPP (polypropylene), HDPE / LDPE (high ( low-density polyethylene) , PVC ( polyvinyl chloride), polyvinyl chloride bags are toxic, at present, there are many PVC color printed handbags on the market, please use the items to be eaten (PVC molecular formula is ( CH-CH ) n is the most important class of vinyl polymers. Since plasticizers, stabilizers, etc. must be added during the film making process, it contains lead, cadmium, and other harmful substances that may cause teratogenicity and Human poisoning; vinyl chloride monomer itself is also carcinogenic; at the same time do not use colored bags.
The thickness of plastic shopping bags provided by the general farmers' markets is about 0.005 mm. The thickness of plastic shopping bags provided by large supermarkets and shopping malls is generally between 0.015 mm and 0.020 mm. Currently, over 80% of the plastic shopping bags on the market cannot reach 0.025 mm thick. National limit plastic standards. After limited plastics, large supermarkets and shopping malls have paid for plastic shopping bags, and malls use biodegradable plastic bags.
Degradable plastics refer to plastic bags that add a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biodegradants, etc.) during the production process, and have a decreased stability and are more easily degraded in the natural environment.
Tests have shown that most of the degradable plastics begin to thin, lose weight, and decrease in strength after being exposed to the general environment for 3 months, and gradually crack into pieces. If these fragments are buried in waste or soil, the degradation effect is not obvious.
Photodegradable plastic  Photosensitizers are incorporated into plastics to gradually degrade the plastic under sunlight. It belongs to the earlier generation of degradable plastics, and its disadvantage is that the degradation time is difficult to predict due to sunshine and climate change, so it is impossible to control the degradation time.
Biodegradable plastics can be completely decomposed into low molecular compound plastics under the action of microorganisms. Its characteristics are convenient storage and transportation, as long as it is kept dry, no light is needed, and it has a wide range of applications. It can be used not only in agricultural mulch, packaging bags, but also in medicine.
Light / biodegradation  A class of plastics that combine photodegradation with microbes, and it has the characteristics of both light and microbially degradable plastics.
Water degradable plastic  Adding water-absorbing substances in plastic can be dissolved after being used in water. It is mainly used for medical and health appliances (such as medical gloves) and is easy to destroy and disinfect. With the development of modern biotechnology, biodegradable plastics have received more and more attention and have become a new generation of research and development hotspots.
The surface of the material used in the plastic bag is delicate and brilliance, soft, suitable for gravure printing, and strong in color expression. Since the gravure printing machine is a coil printing, the thick material is not suitable for printing. The stiffness of our common bag is not enough, and the thickness is general. Between 0.005 mm and 0.020 mm, the grade is not reflected.
Cloth bag
Depending on whether the material used requires textiles, we can divide it into textile fabrics and non-woven fabrics. Textile cloth is divided into plant fiber cloth, chemical fiber cloth and blended cloth; non-woven cloth is usually called non -woven cloth, and the English name is Non Woven , which is a kind of non-woven cloth, which directly uses high polymer chips, short fibers or filaments. The fiber is passed through air flow or mechanically networked, then hydroentangled, needle punched, or hot rolled to reinforce, and finally a non-woven fabric formed by finishing, a novel fiber product having a soft, air-permeable and planar structure, with the advantage of not producing fibers Chips, strong, durable, silky and soft, but also cottony, compared to cotton, non-woven bags easy to shape, and cheaper. Different raw materials used in production are divided into PP non-woven fabrics and polyester non-woven fabrics, PP refers to polypropylene, that is, polypropylene; PET refers to polyester, polyethylene terephthalate, polyester because of the raw material price ratio PP is expensive and is generally used for building waterproofing, while PP nonwovens are mostly due to clothing.
Textile fabric bags use cotton, canvas, polyester-cotton fabrics, Oxford fabrics and other materials. The surface of these fabrics is rough and can not be directly finely printed. Screen printing or transfer printing is often used. At the same time, the price of raw materials is high and the production of handbags is also relatively expensive. General companies will not adopt it.
Non-woven bags are multi-purpose polypropylene non-woven materials, with breathability, heat preservation, waterproofness, stretchability, no mess, feel good, soft, light, elastic, recoverable, no direction of fabric , and textile fabrics Compared with high productivity, fast production speed , low price, and mass production, the material is naturally decomposed on the outside, and its maximum life span is only 90 days. It is decomposed in the room within 8 years, and it is non-toxic and odorless when burned. , And without any legacy material, so as not to pollute the environment, so environmental protection comes from this. In the production process, adding a variety of color masterbatch, can produce a variety of rich colors, bright non-woven fabrics, and finally printed out of the bag fashion, beautiful, generous. Production costs are roughly around 0.7 - 1.8 yuan
With the immature printing process and the change of the way, non-woven bags have also developed from single-color to multi-color to 4- color flat screen printing, and the printing patterns have also reached the effect of paper printing.
Small baskets and baskets
It is made of bamboo, wood and rattan. The carrying articles are strong and durable. They are generally handicrafts, they are expensive, and they are not portable. Production and usage are not large.
From the comparison of paper tote bags, plastic bags, cloth bags, and baskets of small baskets and small baskets, it is not difficult to see that paper-made handbags mostly require BOPP film for surface protection, and they must meet the requirements for color reproduction and printing. cost reduction purposes, generally used is 0.012 - 0.015 mm film, is not consistent with the relevant provisions of the current state of the plastic limit 0.025 mm or less plastic limited use; the same time, for the surface BOPP film protection process handbag recovery is also troublesome to recover After that, it takes a lot of manpower to tear away the BOPP film before it can be recycled. Plastic bag? Since only thin materials can be printed, or composites are also required, thin bags can only produce biodegradable plastic bags due to the national regulations restricting the use of plastics under 0.025 mm , and the cost of repeated degradable thin bags is relatively high. The increase in the cost of composite plastic bags makes it difficult to meet the requirements for use. Small baskets and baskets? There is no comparison with everyone here. As for sacks, cotton, canvas and other materials are the most environmentally friendly, they are plant fibers and do not cause any harm to people. They are green bags, but the cost for single use is not low; polyester cotton cloth, oxford cloth, and blended cloth bags It does not hurt people, but it should also be an environmentally friendly product, and the cost is not low. Non-woven bag products use FDA food-grade raw materials— polypropylene production, free of other chemical components, stable performance, non-toxic, and no odor. Does not irritate the skin, the production cost is roughly 0.7 - 1.8 yuan, the cost of a single use is not high, it can be said that environmental protection products.
At present, the market has emerged as a non-woven composite bag that is as exquisite as the paper-plastic composite bag, with rich colors, beautiful appearance, and fine printing. In fact, it is also a kind of composite bag like a paper-plastic composite bag. Only one paper is composite, and one is a non-woven composite. It depends on consumers who you like. In fact, although the non-woven composite bag does not have the advantage of stiffness, it is water-resistant, tear-resistant, and has a much higher utilization rate for repeated use. It is also portable, and shopping and travel are everywhere.
Have you had a choice?
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