5 Comments

  1. Elvira says:

    The ingredients of plastic bags

    1, synthetic resin

    The synthetic resin is the most important component of plastic, and its content in plastic is generally 40%to 100%. Because the content of large and the nature of the resin often determines the nature of plastic, people often regard resin as synonymous words of plastic. For example, polyvinyl chloride resin mixes with polyvinyl chloride plastic, phenolic resin and phenolic plastic. In fact, resin and plastic are two different concepts. Resin is an unprocessed primitive polymer. It is not only used to make plastic, but also coatings, adhesives and synthetic fiber raw materials. In addition to a small part of the plastic containing 100%resin, most of the plastic needs to be added in addition to the main component resin.

    2, filler

    The fillers are also called filling, which can improve the strength and thermal resistance of the plastic and reduce costs. For example, adding wood powder to the phenolic resin can greatly reduce costs, making phenolic plastic one of the cheapest plastics, and at the same time, it can also significantly improve the mechanical strength. The filler can be divided into two types: organic fillers and inorganic fillers. The former such as wood powder, fragmented cloth, paper and various fabric fibers, etc., latter, such as glass fiber, diatomite, asbestos, charcoal black, etc.

    3, plasticizer

    M plasticizer can increase the plasticity and softness of the plastic, reduce brittleness, and make plastic easy to process. The plasticizer is generally mixed with the resin, non -toxic, odorless, and the most commonly used organic compounds for high -boiling points for light and heat stability. The most commonly used is phthalate. For example, when producing polyvinyl chloride plastic, if more plasticizers are added, a soft polyvinyl chloride plastic can be obtained. Essence

    This provided by the registered user "Rising Sun East Raiders West Mountain", copyright statement feedback

    4, stabilizer

    During the use of light and heat, it is decomposed and destroyed, and the service life is extended. The stabilizer should be added to the plastic. Commonly used are hard fat acid salts, epoxy resin, etc.

    5, coloring agent

    It coloring agents can make plastic have a variety of bright and beautiful colors. Common organic dyes and inorganic pigments are used as color.

    6, lubricant

    The role of lubricant is to prevent plastic from not sticking to the metal mold when molding, and at the same time, the surface of the plastic can be smooth and beautiful. Common lubricants include hard fat acid and its calcium magnesium salt.

    In addition to the above -mentioned additives, flame retardants, foaming agents, antistatic agents, etc. can be added to the plastic to meet different requirements.

    What are the harm of plastic bags to the environment of human beings >>

    M plastic bag quality identification

    The harm of plastic bags is very great, so if it really needs it, If you use it, you should also pay attention to the quality of the plastic bag. When identifying the quality of the plastic bag, pay attention to the seven points below:

    1. First of all, it is necessary to see if the appearance of the plastic bag has a "food" logo. Usually this sign should be on the front of the packaging bag, which is more eye -catching. The second is to look at the color. Generally speaking, most of the plastic bags with color use the waste plastic recycling material, which cannot be used to load food. For example, some vegetable markets are used to load fish, shrimp and other aquatic products or black plastic bags. It was originally used for garbage, and consumers should avoid using it. Finally, it depends on whether the plastic bag has impurities. Put the plastic bag under the sun or light to see if there are black spots and whether there is a mouth. Plastic bags with impurities must be used as raw materials.

    2, smelling the smell of plastic bags, whether it makes people feel disgusting. Qualified plastic bags should be odorless, and unqualified plastic bags will have various flavors because of additives.

    3, the qualified plastic bag has a certain strength, and it will not break it as soon as it is torn; but the unqualified plastic bag is often poor and easy to rupture because the impurities are added.

    4, the qualified plastic bag will make a crisp sound when it shakes; the unqualified plastic bag is often a "buzz" stuffy.

    5. Put the plastic bag in the water and press it to the bottom of the water. For a moment, the water surface is non -toxic plastic bag, and the toxic plastic bag sinks at the bottom of the water.

    6, touch the surface of the plastic bag with your hands, it is smooth and non -toxic. If the color is hazy, the hair is sticky and astringent, it is toxic.

    7. Burning: Cut the plastic bag with a corner, put it on the fire, burns non -toxic, continue to burn after leaving the fire, and the yellow flame appears, and the melting statue appears. Drops of candles fall down, and the smell of paraffin is emitted; the poisonous, not flammable, green flames after burning, and a nose odor.

  2. Albert says:

    1. PE plastic packaging bag

    Clene (, PE), referred to as PE, is a polymer organic compound for ethylene, which is a good material for the world's recognized food in the world. Polyethylene moisture, antioxidant, acid resistance, alkali resistance, non -toxic, odorless, non -odor, meet the food packaging sanitary standards, known as the "flower of plastic".

    2, PO plastic packaging bags

    PO plastic (), referred to as PO, is a polyolefin cluster, a polymer obtained by an olefin single system. Opponents, crispy, non -toxic, often make PO flat pockets, PO vesting bags, especially PO plastic packaging bags.

    3, PP plastic packaging bags

    PP plastic packaging bag made of polypropylene as the material. Sexual polypropylene plastic is a type of thermoplastic plastic. Non -toxic, tasteless, smooth and transparent.

    4, OPP plastic packaging bags

    opp plastic packaging bags are polypropylene, two -way polypropylene, which are characterized by easy combustion, melting dripping, yellow down blue, leave After the fire, there is less smoke and continue to burn. It has the characteristics of high transparency, brittleness, good sealing, strong anti -counterfeiting.

    5, PPE plastic packaging bag

    PPE plastic packaging bag is a combined product produced by PP and PE. High temperature, low temperature resistance, oil -resistant, non -toxic and odorless, high transparency, strong mechanical performance, high explosion resistance, high resistance to puncture and tear resistance.

    6, EVA plastic packaging bags

    eva rubber bag (frosted bag), mainly based on polyethylene tensile materials and linear material, containing 10%EVA materials. Good transparency, oxygen, moisture -proof, bright printing, bright bag body, the characteristics of the product itself as much as possible, oxygen resistance, flame retardant and other characteristics.

    7, PVC plastic packaging bags

    PVC materials include frosted, ordinary transparent, ultra -transparent, environmentally friendly low toxic, environmentally friendly non -toxic materials Other standards), etc., as well as soft and hard glue. It has the characteristics of safety and hygiene, durable, beautiful and practical, exquisite appearance, diverse style, etc. It is very convenient to use. Many high -end product manufacturers generally choose PVC bags to pack them, and they have improved their products.

  3. Nicolas says:

    Pay content for time limit to check for freenAnswer high -temperature resistance includes refractory materials and heat -resistant materials, incompetent compounds, and polymer polymer materials. Fire resistance usually refers to inorganic materials with temperatures above 1580 ° C. They are building kiln, combustion rooms and other building materials that need high temperature resistance. Fire resistance usually refers to inorganic materials with temperatures above 1580 ° C. They are building kiln, combustion rooms and other building materials that need high temperature resistance. Generally made of quartz sand, clay, magnesium ore, white clouds, etc. as raw materials. High temperature and heating insulation coating Zhisheng is a component inorganic coatings. The temperature resistance is -80-1800 ° C. 0.03W/m.k can inhibit the heat radiation and conduction thermal heat of high -temperature objects and low -temperature objects. It can maintain 70%of the calories of high temperature objects without losses. The surface of Zhisheng coatings on the surface of 1100 ° C is applied to 8mm high temperature -resistant heat insulation coating, and the surface temperature of the object can be reduced from 1100 ° C to 100 ° C. In addition, the high -temperature heat insulation insulation coatings also have the characteristics of insulation, light weight, convenient construction, long service life, etc. It can also be used as an inorganic material to resist high temperature resistant acid -alkali tape, and the attachment objects are firm. Such as refractory cement, magnesium bricks, etc. In a broad sense, inorganic refractory and heat -resistant materials refer to the high hardness, good brittleness, good chemical corrosion properties of these compounds, and good chemical corrosion, and the melting point is above 1500, such as high -temperature glass, which is also a refractory material.nHope to help you, dear ~~

  4. Frankie says:

    Commonly used food plastic bags are mostly made of polyethylene film. The film is non -toxic, so it can be used for food. Another type of film is made of polyvinyl chloride, and polyvinyl chloride itself is also non -toxic, but the additives added according to the use of the film are often harmful to the human body and have certain toxicity. Therefore, this kind of film and plastic bags made by the film [1]
    are not suitable for installation of food. If you want to identify polyvinyl chloride plastic bags and polyethylene plastic bags, you can use the following simple method to identify [2]
    .
    The polyethylene film (non -toxic)
    This film is milky white, translucent (several layers of stacking observation), which is lubricating to the touch, as if the surface is painted with wax layer, shakes hard, the sound is crispy, the sound is crispy In the event of flammable fire, yellow flames, mucus dripping when burning, and the smell of candles when burning.
    The polyvinyl chloride film (generally toxic)
    If no pigment is added, it is transparent, and the surface is a little sticky, shake hard, the sound is low, and the fire is not flawed. The flame is green.
    The temperature of each plastic bag of the landlord is different

  5. Adrian says:

    Hello, original poster! Daily plastic bags are roughly divided into six categories!
    1. Polyethylene-PE. It is an organic compound of polymer for ethylene. Polyethylene is the best ingredient of food in the world. Non -toxic, odorless, odorless, meet food packaging sanitary standards. Polyethylene film, light and transparent, has a general performance such as moisture -proof, antioxidant, acid resistance, alkali resistance, qi density, and excellent thermal sealing. It is known as the "flower of plastic". It is the most important and most important material for plastic packaging.
    2.PVC-polyvinyl chloride
    The polyvinyl chloride is referred to as PVC, molecular formula is (CH2-CH2) n, which is the most important category of ethylene polymer. The second largest plastic variety of polyethylene. The domestic production is the first in plastic. In the printing industry, polyvinyl chloride color pressure -delay film and transparent upper -light film make books, folders, tickets and other enclosure packaging and decoration.
    . 3.-The shrinking film
    The contraction film () is a thermoplastic plastic film that is stretched by stretching during the production process, during which it is treated with hot air treatment or infrared irradiation. After thermal treatment, the film is wrapped tightly on the packaging material. The contraction force reaches the maximum value during the cooling stage and can be stored for a long time.
    4.LDPE-low-density polyethylene
    low-density polyethylene. For short, LDPE is the largest variety in the plastic packaging and printing industry of various countries. The gravity is 0.92 to 0.93, which can float in water. Low crystalline (60%), the ontology aggregation is performed at the pressure of 1000 ~ 3000kg/c㎡, so it is also called high -voltage polyethylene. At 23 ° C, the density is around 0.92. The pressure extension type is poor, and it is suitable for processing into a tubular film. Suitable for food packaging, fiber products packaging, daily necessities packaging.
    5.HDPE-High-density polyethylene
    High-density polyethylene, referred to as HDPE. The density is 0.941 ~ 0.965g/cubic centimeter. Formed by low -voltage aggregation, it is also called low -voltage ethylene. It is milky white, indicating that the gloss is poor. The processing film can be squeezed out of the molding method and T mold. Heat resistance and steaming, cold -resistant and freezing, moisture -proof, resistance, and isolation performance is not easy to damage. The strength is twice the strength of LDPE. Easy to speak. Paper is strong, known as "paper -based plastic film".
    6.bopp-two-way stretching polypropylene film
    bilateral stretching polypropylene film, also known as bidirectional stretch polypropylene film, English abbreviation code BOPP, which are characterized by stretch molecular orientation, Mechanical strength, folding strength, gas density, and moisture -proof resistance are better than ordinary plastic film. Compared with glass paper, the unit price is lower than the glass paper. Due to the excellent transparency of this film, the color is particularly bright and beautiful after the printing, which is an important substrate for plastic composite soft packaging.
    This:
    The toxic identification of plastic bags
    Mohtsu plastic bags commonly used are made of polyethylene film. The film is non -toxic, so it can be used for food food. Another type of film is made of polyvinyl chloride, and polyvinyl chloride itself is also non -toxic, but the additives added according to the use of the film are often harmful to the human body and have certain toxicity. Therefore, such thin films and plastic bags made by the film should not be used to make food. If you want to identify polyvinyl chloride plastic bags and polyethylene plastic bags, you can use the following simple method to identify.
    The polyethylene film (non -toxic)
    This film is milky white, translucent (several layers of stacking observation), which is lubricating to the touch, as if the surface is painted with wax layer, shakes hard, the sound is crispy, the sound is crispy In the event of flammable fire, yellow flames, mucus dripping when burning, and the smell of candles when burning.
    The polyvinyl chloride film (generally toxic)
    If no pigment is added, it is transparent, and the surface is a little sticky, shake hard, the sound is low, and the fire is not flawed. The flame is green.

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