Just saw a diplomatic storm news, poisonous dumplings triggered seven years of poison dumpling case affects the reputation of Chinese exports, but also a diplomatic storm, so that people raise questions on Chinese food, do not trust to a certain level. Subsequently, the strong focus on domestic government to eliminate these negative phenomena. After processing has been worlds apart, a lesson that we can not be repeated, as PINEZONE abrasive sanding belt the Wheel "> resin wheel production enterprises, the use of raw materials is doubly concerned.
Phenolic resin (phenolic resin) referred to PE. Phenolic resin is yellow, transparent, amorphous bulk material, due to the presence of free molecules reddish, the proportion of 1.25 to 1.30, soluble in alcohol, insoluble in water, water, weak acid, weak base solution stable. From phenol and formaldehyde in the catalyst conditions, condensation, and the resin was washed with water and made. Due to use of different catalysts can be divided into two types of thermoset and thermoplastic. Phenolic resin has good acid PINEZONE PSA sanding disc resistance, mechanical properties, heat resistance, widely used in anticorrosion, adhesives, flame-retardant materials, resin grinding wheel manufacturing and other industries. The thermosetting phenolic resin is also an important raw material for adhesives, a single brittle phenolic resin is mainly used for bonding plywood and sand casting. Other polymer-modified phenolic resin-based adhesive material, plays an important role in the structure of the gel. Which phenolic - nitrile phenolic - acetal, phenolic - epoxy, phenolic - epoxy - acetal, phenolic - nylon and other adhesive has good heat resistance, high bond strength characteristics. Phenolic - nitrile and phenolic - acetal adhesive also has tensile, impact resistance, heat aging performance, structural PINEZONE abrasive cloth belt adhesives varieties. After phenol and formaldehyde synthesis of similar chemical structure as ethyl acetate, methyl merely replaced the ring, so that this structure relative to urea-formaldehyde, melamine is considerably more stable, which is difficult to decompose, not easily produce formaldehyde, so environmental protection higher. And ester (fat) class has a feature that is not soluble in water, so with phenolic resin has some moisture function, and a small amount of water vapor and will not cause a drop of glue floor!
For all sorts we are strictly similar unpleasant event does not occur, to avoid the consequences of rebirth.
2014年1月14日星期二
Brief Description: The single particle diamond or diamond pen
Thread grinding wheel dressing method
Methods: Turning trimming France / hand repair, by template type, shrink imitation rituals, automatic trimming
Brief Description: The single particle diamond or diamond pen, follow the turning mode, the car repair a tooth required. Diamond should be sharp angle 70 ° -80 °. Diamond Pen Specifications non woven abrasive Optional F100-4, F80-4, F60-4, F46-4, F36-4, etc.
Comparative advantages and disadvantages: ① dressing for a long time, low efficiency, diamond knife life is not long, you need anytime grinding. ② modification of accuracy depends on the mother plate and the moving components of the manufacturing and mounting accuracy and motion uniformity. In mass production is difficult to maintain the consistency of tooth. ③ lower production costs
Scope: The most widely used for zirconia flap disc single-line and multi-line wheel dressing for ball screws, ball nut, acme screw, a small batch
Methods: metal roller extrusion trim
Brief Description: Wheel Material CrWMn, hardness 65HRC, on the rollers to openseveral flutes. Rolling wheel to slow down when repair, wheel driven synchronously rotating rollers, roller by squeezing the wheel surface grit crushed or make it fall off.
Comparative advantages and disadvantages: metal roller is easy to manufacture, low cost, requires a thread grinding wheel deceleration devices. After dressing the grinding of the workpiece surface abrasive fibre disc
quick change disc roughness higher accuracy than diamond toothed wheel. Metal roller easy to wear, lower life.
Scope: For single-piece, small-batch production, low-precision or high-precision screw thread trimming coarse modification. Requirements threaded grinding wheel spindle has sufficient rigidity.
Methods: Turning trimming France / hand repair, by template type, shrink imitation rituals, automatic trimming
Brief Description: The single particle diamond or diamond pen, follow the turning mode, the car repair a tooth required. Diamond should be sharp angle 70 ° -80 °. Diamond Pen Specifications non woven abrasive Optional F100-4, F80-4, F60-4, F46-4, F36-4, etc.
Comparative advantages and disadvantages: ① dressing for a long time, low efficiency, diamond knife life is not long, you need anytime grinding. ② modification of accuracy depends on the mother plate and the moving components of the manufacturing and mounting accuracy and motion uniformity. In mass production is difficult to maintain the consistency of tooth. ③ lower production costs
Scope: The most widely used for zirconia flap disc single-line and multi-line wheel dressing for ball screws, ball nut, acme screw, a small batch
Methods: metal roller extrusion trim
Brief Description: Wheel Material CrWMn, hardness 65HRC, on the rollers to openseveral flutes. Rolling wheel to slow down when repair, wheel driven synchronously rotating rollers, roller by squeezing the wheel surface grit crushed or make it fall off.
Comparative advantages and disadvantages: metal roller is easy to manufacture, low cost, requires a thread grinding wheel deceleration devices. After dressing the grinding of the workpiece surface abrasive fibre disc
quick change disc roughness higher accuracy than diamond toothed wheel. Metal roller easy to wear, lower life.
Scope: For single-piece, small-batch production, low-precision or high-precision screw thread trimming coarse modification. Requirements threaded grinding wheel spindle has sufficient rigidity.
2014年1月6日星期一
Coated Abrasives substrate type and production deal
Belt as a substrate composed of three elements, one is abrasive and adhesive belt carrier, while many aspects of belt characteristic also reflected by the substrate, such as a flexible belt is transferred from the substrate from, sizes also depends on the size of the substrate, the joint is mainly in the form of the substrate is. Visible substrate belt will directly affect the processing characteristics and life. The process again from the watch belt, the transmitted power required substrate to withstand abrasive sanding belt the mechanical forces in the processing of high temperature and neither stretching nor broken. This requires not only a substrate having a certain tensile strength, shear strength, burst strength, thermal stability, and have a certain toughness, dimensional accuracy of the operation to reduce belt fatigue damage, shock and vibration, and also Because the quality of the substrate will be reflected through the abrasive and the workpiece surface up. Different substrates, woven substrates of different manufacturing process will determine the manner and nature of the substrate and the Sanding Sheets different applications, the research and development of the coated abrasive substrate is also an extremely important aspect. Application of a substrate types and
Common base with the following categories: paper, film, cloth, vulcanized fiber, polyester fiber and composite substrates and so on. Each substrate and in accordance with the required flexibility, strength and material removal can be divided into different intensity levels.
1 base paper substrate and film
Paper used as the substrate has a long history, low cost, and its smooth surface, low surface roughness material, but poor strength and toughness, load capacity is better cloth material. Film is used as the base country also rare, existing applications and the development direction of high-precision grinding as one in a foreign country (such as the UK), but it is subject to the same paper and light load roughing pass power, to withstand high pressure restrictions commonly used in light-load manual polishing and wood processing.
With advances in manufacturing technology, it has been able to produce high-intensity heavy-duty paper, heavy paper production process by adding a polymer to further enhance its strength. A conventional paper substrate sheet is laminated to three or four or more layers together to obtain the desired strength, the strength of the paper only reload one or more further layers are obtained, and Thermal sensitivity is small. Paper substrate in terms of length or width are relatively easy to obtain, and therefore more and more popular paper substrate. The original trial of a ring of paper only for low-load belt grinding or polishing, but since the introduction of two coated abrasive sand production line can produce different specifications and uses existing paper-based belt for selection, and the intensity higher, but the lack of development of heavy-duty paper. However, heavy paper substrate is an important direction of development. To improve the strength of a paper substrate and a flexible wet grinding often added or coated with the rubber, resin, or other materials in the paper base.
2 cloth material made from cotton or synthetic fibers made to increase the strength of the matrix polymer impregnated. Cotton cloth divided into two categories: one is a better light load flexible fabric - fine twill (J), the other is a heavy-duty fabric - denim fabric (X). Clearly, denim strength, poor flexibility for modifications on the machine grinding, but also for the disc grinder or belt grinder roughing. When the surface of the complex and just keep its shape, use of non-woven substrate is more suitable, but lower removal rate. Cloth material also often divided abrasive paper sheet into four models for selection: J type, X-, Y-, S-type. J-type fabric is lightly loaded, soft, coarse molding for polishing: powerful X-type cloth, durable, suitable for heavy duty grinding: Y-type fabric weight of 30% compared to X-type, the overloaded Bucky not only tensile strength, but also to pierce, cracked, wrinkled or split stack are more resistant. It turns out the wire, wide belt grinding plate is very suitable, S-type cotton cloth, used a combination of wide belt machine. Cloth material widest range of applications, adding polymers or fiber cotton cloth material of various coolants have better resistance. In high-speed belt grinding, after a reasonable choice of abrasive must match the base of high-intensity, then often considered cloth material. 3 vulcanized fiber base
This substrate is laminated by a vulcanized fibers. Vulcanized fiber is broken cotton as raw material and then chemically treated cotton fibers to make gelled together, which is characterized by hard, powerful, good toughness, but still retains its soft music performance and is not sensitive to the coolant. The several layers of paper overlap gelled together and ground smooth vulcanized fiber substrate produced and made available for the production of coated abrasive grinding can be used to roll grinder.
Common base with the following categories: paper, film, cloth, vulcanized fiber, polyester fiber and composite substrates and so on. Each substrate and in accordance with the required flexibility, strength and material removal can be divided into different intensity levels.
1 base paper substrate and film
Paper used as the substrate has a long history, low cost, and its smooth surface, low surface roughness material, but poor strength and toughness, load capacity is better cloth material. Film is used as the base country also rare, existing applications and the development direction of high-precision grinding as one in a foreign country (such as the UK), but it is subject to the same paper and light load roughing pass power, to withstand high pressure restrictions commonly used in light-load manual polishing and wood processing.
With advances in manufacturing technology, it has been able to produce high-intensity heavy-duty paper, heavy paper production process by adding a polymer to further enhance its strength. A conventional paper substrate sheet is laminated to three or four or more layers together to obtain the desired strength, the strength of the paper only reload one or more further layers are obtained, and Thermal sensitivity is small. Paper substrate in terms of length or width are relatively easy to obtain, and therefore more and more popular paper substrate. The original trial of a ring of paper only for low-load belt grinding or polishing, but since the introduction of two coated abrasive sand production line can produce different specifications and uses existing paper-based belt for selection, and the intensity higher, but the lack of development of heavy-duty paper. However, heavy paper substrate is an important direction of development. To improve the strength of a paper substrate and a flexible wet grinding often added or coated with the rubber, resin, or other materials in the paper base.
2 cloth material made from cotton or synthetic fibers made to increase the strength of the matrix polymer impregnated. Cotton cloth divided into two categories: one is a better light load flexible fabric - fine twill (J), the other is a heavy-duty fabric - denim fabric (X). Clearly, denim strength, poor flexibility for modifications on the machine grinding, but also for the disc grinder or belt grinder roughing. When the surface of the complex and just keep its shape, use of non-woven substrate is more suitable, but lower removal rate. Cloth material also often divided abrasive paper sheet into four models for selection: J type, X-, Y-, S-type. J-type fabric is lightly loaded, soft, coarse molding for polishing: powerful X-type cloth, durable, suitable for heavy duty grinding: Y-type fabric weight of 30% compared to X-type, the overloaded Bucky not only tensile strength, but also to pierce, cracked, wrinkled or split stack are more resistant. It turns out the wire, wide belt grinding plate is very suitable, S-type cotton cloth, used a combination of wide belt machine. Cloth material widest range of applications, adding polymers or fiber cotton cloth material of various coolants have better resistance. In high-speed belt grinding, after a reasonable choice of abrasive must match the base of high-intensity, then often considered cloth material. 3 vulcanized fiber base
This substrate is laminated by a vulcanized fibers. Vulcanized fiber is broken cotton as raw material and then chemically treated cotton fibers to make gelled together, which is characterized by hard, powerful, good toughness, but still retains its soft music performance and is not sensitive to the coolant. The several layers of paper overlap gelled together and ground smooth vulcanized fiber substrate produced and made available for the production of coated abrasive grinding can be used to roll grinder.
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