Second, the general characteristics of plastic
In many ways, plastics perform better than natural materials. Plastics are relatively stable, water-resistant, soft, and strong. These properties are very good for their use, but not for their manufacture and use. In printing, the disadvantages are the generation of static electricity, miscibility of softeners, poor performance in accepting ink, and too much elasticity.
The following briefly describes the characteristics and performance of the most commonly used plastics:
Cellulose derivative
Cellulose derivatives used for screen printing are mainly grown on the market, one is cellulose acetate (CA), and the other is cellulose acetate butyl acetate (CAB). Cellulose acetate is also commonly used as a matrix brush material, which is inexpensive and usually has a plasticizer or softening odor. Acetic acetate membrane is soluble in certain solvents such as acetone. Cellulose has good weatherability, but it is more expensive than cellulose acetate, it has long-lasting gloss and is not prone to static. Other cellulose T} organisms, such as ethyl cellulose and methyl cellulose, are not important for screen printing.
Telus for identifying cellulose acetate in the burning test are: burning fast, not self-extinguishing, not much ash, burning droplets, smell of softener or burning paper.
In the burning test, cellulose tert-butyl acetate was the same as cellulose acetate except for the odor of butyric acid.
2. Polyolefin resin
Polyethylene (PE) and polypropylene (PP) are the most important among polyolefin plastics. Polyethylene is used in large quantities in the packaging industry and is itself milky white. High-density, low-pressure polyethylene is hard, impact-resistant, and water-vapor-resistant, and is commonly used to make bottles, containers, and films (usually for frozen goods). Low-density high-pressure polyethylene feels slick, cold-resistant, and has good water vapor resistance. This material is particularly strong, mainly used as a packaging film, low-density polyethylene is also used to produce bottles and other containers, is also currently used as a composite film on paper, cardboard and aluminum surfaces. Before printing, the slick surface of polyethylene must be treated with spark or gas flame. There are specialized devices on the market for this type of pretreatment.
Polypropylene is a material that is itself somewhat transparent, or colorless to brown, and is particularly strong, with a slippery feel and a low specific gravity (0.9 to 0.911 kg/dm3). Polypropylene is more resistant to impact and water vapor, and is used in the production of films and containers. This plastic must also be pre-treated before printing.
Burning test to identify the characteristics of polyethylene is: burning acetylene will not self-extinguishing, no droplets, there is the smell of wax.
In the combustion test, the properties of polypropylene were similar to that of polyethylene, but the smell was somewhat like a mosquito coil and it was more irritating.
Ethylene copolymer
The most famous ethylene copolymer is polyvinyl chloride (PVC), a very versatile material that is easy to mold and screen-printing. Polyvinyl chloride can be divided into rigid polyvinyl chloride and soft polyvinyl chloride. Soft polyvinyl chloride is added with a considerable amount of plasticizer (10~60%), so it is also called plastic polyvinyl chloride. Hard PVC adds less plasticizer. Plasticizers or softeners are phthalic acid, adipic acid, chlorinated paraffin, and the addition of these substances to the plastic will make the plastic malleable. When printed on a plastic surface, these plasticizers cause "softeners to be miscible", that is, the printing ink spreads on the surface of the material. This phenomenon occurs not only during the screen printing of the PVC board but also in the quit. Plastic PVC film screen printing process. These soft PVC films on the market come in a variety of colors and thicknesses (0.05 to 0.2 mm), have a glossy surface, and are also matte. PVC film is used to produce labels, automotive license plates, signage, panels, industrial signboards, product trademarks, etc., but it must be understood that PVC will shrink at high temperatures, that is, during drying of the ink layer, and it will not be resistant to chemicals and solvents. .
Polyvinyl acetate vinegar (PVAC) and polyvinyl alcohol (PVAL) are both known derivatives of ethylene copolymers or copolymers. PVAL is a polyvinyl acetate acetic acid produced in the presence of a base, which is a water-soluble plastic material. PVAL is used together with PVAC as the main component for the production of silk screen stencils.
In the burning test, the characteristics of the identification of PVC are: fast burning, yellow-green flame, and smell of hydrochloric acid.
4. Polystyrene
Polystyrene (PS) is an ideal plastic material for producing advertising light boxes. It has good weatherability, glass-like transparency, brittleness, and high gloss. The brittleness of PS can be remedied by copolymerization with propylene nitrate, since this copolymerization produces a so-called "impact-resistant" polypropylene (SAN).
The more familiar styrene copolymer is ABS (derivative of styrene butadiene styrene copolymer). Expanded Polystyrene (XPS) is an impact-resistant, insulating, light-colored material that is widely used in the packaging industry.
In the combustion test, the characteristics of the identification polystyrene (copolymer) are: burning fast, not self-extinguishing, with many grime, yellow orange flames, and fruit odor.
(to be continued)
In many ways, plastics perform better than natural materials. Plastics are relatively stable, water-resistant, soft, and strong. These properties are very good for their use, but not for their manufacture and use. In printing, the disadvantages are the generation of static electricity, miscibility of softeners, poor performance in accepting ink, and too much elasticity.
The following briefly describes the characteristics and performance of the most commonly used plastics:
Cellulose derivative
Cellulose derivatives used for screen printing are mainly grown on the market, one is cellulose acetate (CA), and the other is cellulose acetate butyl acetate (CAB). Cellulose acetate is also commonly used as a matrix brush material, which is inexpensive and usually has a plasticizer or softening odor. Acetic acetate membrane is soluble in certain solvents such as acetone. Cellulose has good weatherability, but it is more expensive than cellulose acetate, it has long-lasting gloss and is not prone to static. Other cellulose T} organisms, such as ethyl cellulose and methyl cellulose, are not important for screen printing.
Telus for identifying cellulose acetate in the burning test are: burning fast, not self-extinguishing, not much ash, burning droplets, smell of softener or burning paper.
In the burning test, cellulose tert-butyl acetate was the same as cellulose acetate except for the odor of butyric acid.
2. Polyolefin resin
Polyethylene (PE) and polypropylene (PP) are the most important among polyolefin plastics. Polyethylene is used in large quantities in the packaging industry and is itself milky white. High-density, low-pressure polyethylene is hard, impact-resistant, and water-vapor-resistant, and is commonly used to make bottles, containers, and films (usually for frozen goods). Low-density high-pressure polyethylene feels slick, cold-resistant, and has good water vapor resistance. This material is particularly strong, mainly used as a packaging film, low-density polyethylene is also used to produce bottles and other containers, is also currently used as a composite film on paper, cardboard and aluminum surfaces. Before printing, the slick surface of polyethylene must be treated with spark or gas flame. There are specialized devices on the market for this type of pretreatment.
Polypropylene is a material that is itself somewhat transparent, or colorless to brown, and is particularly strong, with a slippery feel and a low specific gravity (0.9 to 0.911 kg/dm3). Polypropylene is more resistant to impact and water vapor, and is used in the production of films and containers. This plastic must also be pre-treated before printing.
Burning test to identify the characteristics of polyethylene is: burning acetylene will not self-extinguishing, no droplets, there is the smell of wax.
In the combustion test, the properties of polypropylene were similar to that of polyethylene, but the smell was somewhat like a mosquito coil and it was more irritating.
Ethylene copolymer
The most famous ethylene copolymer is polyvinyl chloride (PVC), a very versatile material that is easy to mold and screen-printing. Polyvinyl chloride can be divided into rigid polyvinyl chloride and soft polyvinyl chloride. Soft polyvinyl chloride is added with a considerable amount of plasticizer (10~60%), so it is also called plastic polyvinyl chloride. Hard PVC adds less plasticizer. Plasticizers or softeners are phthalic acid, adipic acid, chlorinated paraffin, and the addition of these substances to the plastic will make the plastic malleable. When printed on a plastic surface, these plasticizers cause "softeners to be miscible", that is, the printing ink spreads on the surface of the material. This phenomenon occurs not only during the screen printing of the PVC board but also in the quit. Plastic PVC film screen printing process. These soft PVC films on the market come in a variety of colors and thicknesses (0.05 to 0.2 mm), have a glossy surface, and are also matte. PVC film is used to produce labels, automotive license plates, signage, panels, industrial signboards, product trademarks, etc., but it must be understood that PVC will shrink at high temperatures, that is, during drying of the ink layer, and it will not be resistant to chemicals and solvents. .
Polyvinyl acetate vinegar (PVAC) and polyvinyl alcohol (PVAL) are both known derivatives of ethylene copolymers or copolymers. PVAL is a polyvinyl acetate acetic acid produced in the presence of a base, which is a water-soluble plastic material. PVAL is used together with PVAC as the main component for the production of silk screen stencils.
In the burning test, the characteristics of the identification of PVC are: fast burning, yellow-green flame, and smell of hydrochloric acid.
4. Polystyrene
Polystyrene (PS) is an ideal plastic material for producing advertising light boxes. It has good weatherability, glass-like transparency, brittleness, and high gloss. The brittleness of PS can be remedied by copolymerization with propylene nitrate, since this copolymerization produces a so-called "impact-resistant" polypropylene (SAN).
The more familiar styrene copolymer is ABS (derivative of styrene butadiene styrene copolymer). Expanded Polystyrene (XPS) is an impact-resistant, insulating, light-colored material that is widely used in the packaging industry.
In the combustion test, the characteristics of the identification polystyrene (copolymer) are: burning fast, not self-extinguishing, with many grime, yellow orange flames, and fruit odor.
(to be continued)
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