Guide to Buy Pvc Fabric Tent in Linyang

News:
The color paste for printing all polyvinyl chloride films is not the same, and the proportion of color paste can only be determined after testing.
Under special circumstances, the following requirements should be put forward for printing color paste used for polyvinyl chloride film:
① printing color paste should not contain plasticizer that will soften hard film;
The printing paste used for soft films shall not contain binder that will be dissolved by plasticizer contained in the film.
If the printing pigment becomes soft, it will lose its own friction strength.

② the solvent in the printing paste should not produce too strong expansion effect on the film.
If the expansion effect is too large, the film will shrink and the solvent will be difficult to volatilize.

Selection of polyvinyl chloride film printing paste and its method
③ the boiling point of solvent contained in printing paste should not be too high, otherwise, the printing paste itself requires a long drying time.
If there is residual solvent inside the film, it will cause adverse consequences.

④ the pigment in the printing paste should have no migration.

In addition to these special requirements, it is also required to have general light resistance and water resistance, and to have stability to grease and other foods, in some cases, good welding performance is required.
Sometimes special requirements are put forward for the extensibility of the printing pigment itself.
This requirement is raised when the printed film still needs to be molded.
The desired printed pattern is printed on a formed object, and then it is heated above 72℃ until it shrinks and returns to the plane shape of the original film. In the lead version (That is, printing mold)
The pattern left after the film shrinks is engraved on it.
If the film is printed with this lead plate and then the film is formed, the original desired pattern will be correctly displayed on the forming body.

in order to ensure that the printed pattern will not be worn, a layer of cover finish paint is often applied, or a layer of cover film (Also known as sealed printing)
This can be used for packaging purposes, such as chocolate packaging.
When choosing the most technically reasonable and economical printing method, it is necessary to consider the size of the printing volume, the color of the printed color, the shape of the product and the quality requirements for the pattern (That is, the requirements for the fineness and accuracy of the pattern)
, There are fashion needs to choose according to a number of specific circumstances.

News:
PVC plastic wrap is also polyvinyl chloride. Due to the need of production process, a large amount of plasticizer will be added to pvc plastic wrap during the production process, that is, the plasticizer we usually say.
It is understood that CCTV exposed that a variety of PVC plastic wrap is toxic.
But how to identify toxic plastic wrap, many people are really not very clear, see, touch, fire.
Now I'll teach you three ways to identify:
How to identify whether PVC plastic wrap is toxic
1. On the description of the outer packaging product of plastic wrap, if it is marked with'PE”
The words, or clearly marked material is polyethylene, can be used with confidence;
If it is written in pvc material or not marked, do not buy it.

2. Take out a roll of PE plastic wrap and rub it with your hand. The viscosity is poor and it is easy to open;
However, PVC plastic wrap has good viscosity and is not easy to unfold after rubbing by hand.

3. Ignite PE plastic wrap. If the flame is yellow after burning, it will not go out without the fire source. The plastic wrap drips down like wax oil, giving off a candle smell, is non-toxic polyethylene film.
However, PVC plastic wrap is not easy to ignite and will go out after leaving the fire source, with an unpleasant pungent smell after burning.

PVC board is made of polyvinyl chloride, and PE board is made of polyethylene. Now we come to understand the difference between PVC and polyethylene.　
Polyvinyl chloride is abbreviated as PVC, its natural color is light yellow translucent and shiny. Transparency is better than polyethylene and polystyrene, but worse than polystyrene. Depending on the amount of additives, it can be divided into soft and hard polyvinyl chloride. Soft products are flexible and tough, and feel sticky. The hardness of hard products is higher than that of low-density polyethylene. , And lower than polypropylene, whitening will occur at the inflection.
Material properties　　
Density 1380 kg/m3 　　
Young's modulus of elasticity (E) 2900-3400 MPa 　　
Tensile strength (σt) 50-80 MPa 　　
Elongation @ break 20-40% 　　
Notch test 2-5 kJ/m2 　　
Glass transition temperature 87 °C 　　
Melting point 212 °C 　　
Vicat B1 85 °C 　　
Thermal conductivity (λ) 0.16 W/m.K 　　
Coefficient of thermal expansion (α) 8 10-5 /K 　　
Heat capacity (c) 0.9 kJ/(kg・K) 　　
The biggest feature of PVC is flame retardant, so it is widely used in fire protection applications. But polyvinyl chloride will release hydrogen chloride and other toxic gases such as dioxins during the combustion process.　　
The combustion of PVC is divided into two steps. First, the hydrogen chloride gas and the diolefin containing double bonds are decomposed by burning at 240℃-340℃, and then carbon combustion occurs at 400-470℃.　　
Stable physical and chemical properties; not easy to be corroded by acids and alkalis; relatively resistant to heat; polyvinyl chloride has flame retardant (flame retardant value above 40), high chemical resistance (resistant to concentrated hydrochloric acid, 90% sulfuric acid , 60% nitric acid and 20% sodium hydroxide), good mechanical strength and electrical insulation. But its heat resistance is poor, with a softening point of 80°C, it starts to decompose and change color at 130°C, and precipitate HCI.　　
Industrial polyvinyl chloride resin is mainly amorphous structure, but also contains some crystalline regions (about 5%), so polyvinyl chloride has no obvious melting point, and it starts to soften at about 80°C. The thermal distortion temperature (under 1.82MPa load) ) Is 70-71 ℃, it starts to flow under pressure at 150 ℃, and slowly releases hydrogen chloride, which causes discoloration of polyvinyl chloride (from yellow to red, brown, or even black). The weight-average relative molecular mass of industrial polyvinyl chloride is in the range of 4.8-48,000, and the corresponding number-average relative molecular mass is 2-19.5 million. The weight average molecular weight of most industrial resins is between 100,000 and 200,000, and the number average molecular weight is between 45 and 64,000. Rigid polyvinyl chloride (without plasticizer) has good mechanical strength, weather resistance and Flame resistance, can be used alone as a structural material, used in the chemical industry to make pipes, plates and injection molded products. Rigid polyvinyl chloride can use reinforcing materials.
Polyethylene, abbreviated as PE, is a thermoplastic resin made by polymerization of ethylene.
Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest use temperature can reach -70～-100℃), has good chemical stability, and can withstand most acids and alkalis (not resistant to oxidation) It is insoluble in general solvents at room temperature, has low water absorption, and has excellent electrical insulation properties; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects) and has poor heat aging resistance.　　
The properties of polyethylene vary from species to species, mainly depending on the molecular structure and density.
Specific gravity: 0.94-0.96 g/cm3
Molding shrinkage: 1.5-3.6%
Molding temperature: 140-220℃
Types of polyethylene:
　(1) LDPE: low density polyethylene (also known as high pressure polyethylene)
　 (2) LLDPE: linear low density polyethylene 　　
(3) MDPE: Medium density polyethylene 　　
(4) Modified polyethylene: chlorinated polyethylene (CPE), cross-linked polyethylene (PEX)

The tent is mainly composed of a canopy body and a bracket. Due to the high requirements of canvas on the disaster relief tent, it has the function of waterproof and breathable at the same time. Some special-purpose tents also have anti-radiation, anti-biochemical, and night reflection. , invisible function. The canvas must have a breathable function, because the moisture in the air in the tent cannot escape, which will have a greater impact on the people and objects in the tent. The bottom components of the disaster relief tent are composed of 4 long tubes with pins, 6 short tubes, 6 T-joints, 90°The three-pronged joint is composed of 4 parts, which provides a strong guarantee for the bottom of the hood to firmly grasp the ground. The components of the canopy are divided into: 12 long tubes with pins, 6 short tubes, 4 T-joints, 3 cross four-pronged joints, 2 eight-shaped three-pronged joints, 2 left angle forks, 2 right angle forks indivual. The canopy wall is composed of 10 straight pipes without pins. It forms a stable system for the tent, so that the disaster relief tent has enough stability to withstand the impact of strong winds when it is subjected to strong wind direction details. The brackets of disaster relief tents are generally made of metal pipes, which can be divided into: top rod type, folding type and frame type from the overall structure. The ejector type has the characteristics of light weight and quick installation, but the disadvantage is that the wind resistance is poor. Folding bracket is a new bracket structure in recent years, which is mostly used in small tents and has superior performance than top pole brackets. If it is a larger disaster relief tent or cotton tent, most of them use frame-type brackets, which have strong firmness and wind resistance. Therefore, it is widely adopted by tent manufacturers in various countries. Before installing the tent, we must first divide the tent tube into three parts according to the bottom of the tent, the wall and the top of the tent, so that our tent can be installed conveniently and quickly. In the 1950s and 1980s, most of the tents were made of pure cotton canvas. The waterproof and breathable ability was good, but the ability and strength were poor. Generally, a tent can only be used for about a year, and the weight and volume are relatively large. Difficulty in use and transportation. After 1990, polyester-cotton blended canvas appeared. The strength was increased, but the waterproof ability was reduced, and the weight and degree were similar to those of pure cotton. Around 2000, a pure polyester yarn-dyed canvas appeared in China, and its strength was greatly improved compared with the previous two generations of canvas. The weight is 20-30% lighter than that of pure cotton canvas.