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The Classification and Development of Laminated Products

time:2018-01-17 09:08:52 Author:

Introduction: Laminated products are composed of two or more layers of resin-impregnated fibers or fabrics that are combined with hot pressure. It can be board,

Introduction: Laminated products are composed of two or more layers of resin-impregnated fibers or fabrics that are combined with hot pressure. It can be board, tube, stick or other shape. Laminated products can be processed into various insulation and structural parts, widely used in electric motors, transformers, high and low voltage electrical appliances, electrical instruments and electronic equipment.


Laminated products are lamellar electrical insulation materials made of fiber paper, cloth, impregnated or coated with different adhesives. The organic fiber-based substrates are wood fiber paper, cotton fiber paper, cotton cloth, polyester and aromatic polyamide synthetic fiber etc. The substrate of inorganic fiber has alkali glass cloth, asbestos and so on. The commonly used adhesives are phenolic resin, epoxy resin, melamine resin, organic silicone resin, diphenyl ether and polyimide.


Category: The properties of a laminate depend on the substrate and the binder as well as the molding process. According to its composition, properties and heat resistance, laminated products can be divided into the following two kinds.


(1)Organic substrate laminated products-wood pulp insulation paper, cotton fiber paper, cotton are used as reinforcing materials. Its long-term use temperature can reach 120 ℃, and it also developed synthetic fiber products to be the reinforcing material.


(2)Inorganic Substrate Laminated products-inorganic glass fiber cloth, E-glass fiber mat are used as reinforcing materials. Its long-term use temperature can reach 130 ~ 180 ℃, even up to higher temperatures, with the adhesive resin varies.


Laminated plastic products are divided into laminated board, laminated tube, laminated rod and molded laminated products by shape and purpose. Copper foil board used for printed circuit and the adhesive paper capacitor sleeve core for high voltage electrical appliances are two kinds of special laminated plastic products.


Laminated board: including laminated paper board, cloth board, glass cloth board and copper foil board.


① Laminated paper board: insulating paper impregnated with synthetic resin adhesive.With good dielectric properties and mechanical properties, it is suitable for all kinds of insulating structure parts for electrical equipment.


② Laminated cloth board: cotton cloth soaked with synthetic resin. It has good mechanical processing performance, and its hardness, anti-splitting and impact strength are better than paperboard, but the electrical performance is not as good as laminated paperboard. Its purpose is the same as laminated paperboard.


③ Laminated glass cloth board: non-alkali glass cloth impregnated with different synthetic resins. Its mechanical properties, heat resistance and water resistance are higher than laminated paperboard and cloth board, but the adhesive strength is slightly worse. Its purpose is the same as laminated paperboard.


④ Copper clad laminates: phenolic resin or epoxy phenolic resin impregnated with alkali-free glass cloth or cotton fiber paper as substrate, and then electrolyzed copper foil deposited on one or both sides of the substrate, then hot pressed. It has good mechanical properties and dielectric properties as well as high peel strength. They are mainly used as printed circuit board for electronic equipment.

Laminated paper boardDiphenyl Ether Glass Cloth Laminated TubePhenolic Cotton Cloth Laminated Rod

Rolled laminated products: including paper, cloth rolled products and adhesive paper capacitor sleeve core.


① Paper cloth rolled products: insulating winding paper, cotton cloth, glass cloth impregnated or coated with synthetic resin, after being rolled, dipped and dried. Commonly used resins are phenolic resin, epoxy phenolic resin, modified silicone resin. Paper cloth products can be made into a rod, tube or tubular. Its dielectric properties and mechanical strength are higher than the average plastic products, but lower than the laminated board and cloth board. They are mainly used as insulation components.


② Capacitive adhesive paper sleeve core: after the paper is coated with synthetic resin, it is dried, hot coiled and heat-treated. In the rolling process, a layer of aluminum foil is sandwiched into every a certain thickness. It is a series capacitor with adhesive paper as medium. It can be used for high voltage transformer and switch.


③ Molded laminates: with insulating paper, cotton cloth, glass cloth impregnated with synthetic resin, then formed by hot pressing mold. It has rod-shaped molded products, V-rings and other special shaped molded products. It has high mechanical properties, dielectric properties and resistance to moisture. It is mainly used as electrical insulation components of motors, appliances and other equipment.


Development: With the development of electrical industry, laminated plastic products with high insulation, high strength, high temperature resistance and suitability for various environments have appeared one after another. Copper clad laminates for printed circuit board also developed rapidly due to the needs of the electronics industry. China's electrical and electronic laminated products are gradually developed after the liberation. China's thermoset laminates have formed a more complete series.


In recent years, with the rapid development of solar cell industry, solar cell laminate is more and more produced, and applied to many aspects of life, and its production technology is also rising continuously. Huang Hao and other people found that the solar cell laminate under the mechanical load, even if it deforms of varying degrees, it does not necessarily have a greater impact on the performance of the battery. Under the given component size data, withstand the mechanical static load of 5,400 Pa stipulated in IEC61215, component deformation will not lead to performance problems such as cracking and splitting of the cell inside the module.


Li Yinbo and others found that different bonding methods have obvious influence on the stress and deformation of the solar cell laminate and the aluminum alloy frame adhesive joint, in which the elastic modulus of the adhesive layer has a greater influence on the stress between the solar laminate and the aluminum alloy frame. When choosing the connection mode between the solar cell laminate and the aluminum alloy, understanding the stress and deformation rules can guide the long-term normal operation of the module under the action of complicated climatic conditions of wind, snow and icing.