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Anti-fogging agent
Anti-fogging agent, also known as anti-fog drops or drops. PVC agricultural film can be prevented to reduce the occurrence of water droplets in the transparent material. Mainly surfactants, esters such as xylitol, sorbitol monopalmitate, or lauric acid monoglycerides hard resin and the like. Plastic packaging materials, plastic packaging material permeability properties
Factors affecting the barrier properties of plastic packaging materials, molecular polarity 1. 2. 3. molecular crystalline molecular hydrophilic molecular orientation 4. 5. Ambient temperature
Improve the barrier properties of plastic packaging materials composite modification method
2. Add the modified additives
3. Surface Coating Modification
(1) vacuum aluminum
(2) vacuum plating oxide (3) coated with amorphous carbon (4) 4. The coated barrier resin modified chemical treatment
Health plastic packet transfer material hygienic hygiene 2. 1. plasticizer stabilizer
3. The health of colorants and inks hygiene 4. Other plastic additives other properties
1. Plastic transparency printability 2. 3. 4. antistatic heat sealability
Flexible packaging and plastic molding
Category 1. singlemode plastic flexible packaging materials 2. Composite material is extruded
In the processing of plastic packaging products, usually the first solid plastic resin into a melt by a suitable method, then it will melt molding such a certain way, to the required manufacturing plastic packaging products. This process can be accomplished in many devices, one of which is an extrusion process, the extrusion process is mainly used to produce films, sheets, and extrusion blow molding bottles and plastic packaging products, equipment used is a plastic extruder.

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Polyethylene pre toughness, dielectric properties and excellent resistance to chemical corrosion, molding process is good, but poor rigidity, less smoke when burning, low-pressure polyethylene temperature up to 100 ℃.
As a white waxy translucent polyethylene material, soft and tough, is lighter than water, non-toxic, it has excellent dielectric properties. Flammable and away from the fire continues to burn. Polyethylene low permeability, organic vapor transmission rate is larger. The transparency of the polyethylene increases with the degree of crystallinity decreased in a certain degree of crystallinity, transparency and increase with increasing molecular weight. High density polyethylene melting point in the range of 132-135 ℃, low density polyethylene low melting point (112 ℃) and wide range.
At room temperature, not soluble in any known solvent, a small amount of more than 70 ℃ dissolved in toluene, amyl acetate, trichlorethylene and other solvents.

Polyethylene has excellent chemical stability, resistance to room temperature, hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, potassium hydroxide and other chemicals, sulfuric acid and nitric acid has a strong role in the destruction of polyethylene . Polyethylene easy photo-oxidation, thermal oxidation, ozone decomposition, prone to degradation under the action of ultraviolet light, carbon black polyethylene has excellent light shielding effect. That can occur after radiation crosslinking, chain scission, form an unsaturated group and so reflect. Polyethylene Classification and Application.

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Classification of polymer materials
1. 2. The thermoplastic polymer material thermosetting polymer materials
Plastic packaging materials commonly used resin and additives
It refers to the plastic polymer material composition and various additives, and malleable material quality, which is composed of two kinds of resin additives and chemical composition of the main component.
Common resin
Polyethylene
PE (polyethylene, referred to as PE) is a thermoplastic resin polymerized ethylene obtained. In the industry, but also copolymers of ethylene with minor amounts of α- olefins. Polyethylene odorless, non-toxic, feel like wax, has excellent low temperature properties (lowest temperature up to -70 ~ -100 ℃), good chemical stability, resistance to most acid-base erosion (intolerance with oxidation properties acid), at room temperature, not soluble in common solvents, water absorption, excellent electrical insulation properties.
Polyethylene odorless, non-toxic, feel like wax, has excellent low temperature properties (lowest temperature up to -70 ~ -100 ℃), good chemical stability, resistance to most acid-base erosion (intolerance with oxidation properties acid), at room temperature, not soluble in common solvents, water absorption, but because of its linear molecules slowly dissolve in some organic solvents, and does not swell, excellent electrical insulation properties; but polyethylene for environmental stress (chemical and mechanical effect) is very sensitive, and poor heat aging.
Polyethylene nature because of different varieties, depending on the molecular structure and density.

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Including packing tape, tear tape, adhesive tape and ropes. Plastic packing tape is made of polypropylene, high density polyethylene or polyvinyl chloride do with the embryo, oriented by uniaxial stretching, embossing from 13 ~ 16mm wide-band, single tensile strength 1300N more than metal or paper packaging strapping convenient and strong.

Structure and properties of the polymer chain basics of polymer materials

Polymer is a long chain molecules made up of atoms covalently bonded phase, it is not necessarily stretched straight, but have a variety of different shapes.

1. Composition and morphology of the polymer chain

According to the geometry of the polymer chain can be divided into linear and integrated two structures. 2. The forces between the polymer (1) bond strength

(2) secondary valence forces

Room (3) intermolecular forces on polymer properties

① less polar hydrocarbons, small intermolecular force and have good flexibility.

② If there are no major side groups in the molecular chain, relatively free movement, showing good flexibility. ③ with polar groups are large intermolecular force, if there are a large side groups, affecting the movement of the chain, and therefore has a certain hardness and strength.

④ If the polar group with a strong intermolecular force larger (such as hydrogen group), together with the molecular structure more structured,

It makes such a polymer having a high strength and other mechanical properties. .

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Many plastic packaging material has good transparency, made the packaging container can clearly see the contents, play a good show, promotional effect. 5. good health
Pure polymer resin almost no toxicity and can be safely used in food packaging. 6. good processability and decorative
Plastic packaging products can use extrusion, injection, plastic molding and other methods, it can easily be infected with a beautiful color or printed decor pattern. Plastics are used in the packaging
1. Film
It comprises a single layer films, laminated films and sheets, made of materials such as flexible packaging, mainly used for packaging food, medicine and so on. 2. Container
(1) plastic bottles, barrels, cans and hose container (2) cups, boxes, plates, boxes and other containers
3. shockproof cushion packaging material
The main use of polystyrene foam, low-density polyethylene, polyvinyl chloride and polyurethane made.
4. The sealing material
Including sealants and cap liners, gaskets, etc., it is a class of adhesive and sealing paste or viscous liquid elastomer, polyurethane or ethylene - vinyl acetate resin as a main component used barrels, bottles, tank sealing material. 5. The strip of material.

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Plastics are referred to the plasticity of polymer materials, it synthetic rubber, synthetic polymer materials belong. Polymer materials mainly in plastics, rubber, fibers, adhesives, coatings, inks and other forms of use in the packaging industry, which is the most widely used plastic. Plastics can be prepared flexible, hollow containers (bottles, cans, buckets, etc.), turnover box, plastic container sheet, foam cushion packaging materials, bags, straps and the like.
Characteristics and plastic packaging products
1. Good light, mechanical properties
Light weight, high strength. Lightweight plastic, the density of plastic in general between 0.9 to 2.3 g / cm 3, only about 1/8 of steel to 1/4, 1/2 2. Suitable aluminum barrier and permeability
Choose a suitable plastic material can be made barrier suitable packaging, including a gas-barrier packaging, moisture-proof packaging, waterproof packaging, preserving flavor and packaging for packing easy because of oxygen, moisture and the role of oxidative deterioration, corruption moldy food and other packaging materials .
3. Good chemical stability
Plastic good resistance capability in general acid, alkali, salt and other media are resistant enough to be resistant to anti-water, oxygen, carbon dioxide and a variety of packaging materials (such as food acidic components, grease, etc.) and packaging from the external environment chemical corrosion medium, which is compared with the metal has a strong advantage. 4. excellent optical performance.

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3. long distance belt conveyor design
3.1 According to the design requirements for aggregate transport characteristics of the belt conveyor system design. Feed-line tape machine is insufficient, the wire can be simultaneously fed to the long distance belt conveyor. Then dried ▽ 308m concrete system B1-B6 tape machine gravel silo to store or through ▽ 360m concrete system A0-A4 to the tape machine gravel silo reserves, after entering the secondary screening aggregate adjustment hopper (once cooled feed warehouse), for the production of concrete mixing plant.
Way long distance running belt conveyor technology delivery system to flow in the central control room to achieve automatic operation by PLC and computer control system. The main control system with fault detection and protection functions, enabling unmanned operation machine side. To this end, long-distance belt conveyor system designed deviation, slipping, blocking, anti-tear and stop (rope) switch, in addition to water installations and other ancillary equipment. In the head with a blanking machine baffle to prevent material falling into the card or tape and tape drum damage. In the machine by the tail with two feed points, in front of the guide trough to enhance the guiding groove, behind the guide trough for the fixed guide trough, when the rear guide trough that is expected, the front guide trough rises. The tape is run by the friction between the tape drive roller and driven. Bypassing tape drive roller and a plurality of rollers to form a bend stepless endless belt, tape up and down respectively by the various branches of the upper and lower roller group supported by a tensioning device for tensioning the tape to the required transmission power roller from the drive means (motor and transmission CST controlled start means). Material through the guide trough constantly added to and subsequently operate together to complete the transportation task on tape.