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The definition and application of untwisted roving
Writer:admin    Released:2018-08-31 17:17:13    Type:【L】【M】【S
Roving is made from parallel primary or parallel single strands.According to the composition of glass, roving without twist can be divided into: glass roving without twist and glass roving without twist.The diameter of the glass fiber used in the production of the roving is from 12 to 23 mm. The number of the roving is from 150 to 9600 (Tex).Roving without twist can be directly used in some composite process molding methods, such as winding, pulling and extrusion processes, because of its uniform tension, can also be woven into roving without twist, in some USES will be further cut roving.(1) the roving without twist for injection molding of GFRP shall have the following properties: excellent cutting performance and less static electricity generated during continuous high-speed cutting;The efficiency of spinning untwisted roving to disperse into the original yarn is high, that is, the beam splitting rate is high, which usually requires more than 90%.The short cut filaments have excellent cladding properties and can cover all corners of the moulds.The resin permeates quickly and is easy to be flattened by roller and expelled air bubbles.With good demultiplexing performance and uniform density of roving yarn, the roving barrel is suitable for various spray guns and fiber conveying systems.Spray roving is made of many strands of raw silk, each containing 200 glass filament.(2) SMC is made of non-twisted roving SMC, namely sheet plastic, which is mainly used to press automobile parts, bathtub, water tank board, purification tank, various seats, etc.The length of Lin (25mm) should be cut by SMC roving in the manufacturing of SMC sheet and dispersed in the resin paste. Therefore, the requirement for SMC to use roving is good short cutting, less wool and good electrostatic resistance. Short cutting will not adhere to the cutter roller during cutting.For colored SMC, roving is impregnated with resin in a resin paste with high pigment content.SMC roving is generally 2400tex without twist, and in some cases 4800tex is also useful.(3) the roving winding method is used to manufacture glass steel pipe and storage tank of various caliber.The number of roving for winding is from 1200 to 9600. Large pipes and storage tanks tend to be directly roving, such as 4800tex direct roving.The requirements for roving without twisting are as follows.The untwisted roving has good demulsibility. It does not take off the loop when dissolving from the yarn barrel.The strain was uniform and no overhang was observed.Normal line density is uniform, generally less than + / - 7%;The roving without twist has good permeability, and it is easy to wet and soak the resin when passing through the resin groove.(4) pull-extruding roving is used to produce various profiles with the same section. It is characterized by high content of glass fiber and high one-way strength.Pull-extruder roving can be multi-ply roving or direct roving, with a line density range of 1100 to 4400.Various performance requirements and winding roving without twist roughly the same.(5) an important use of roving for weaving roving is to weave woven roving fabric of various thicknesses or one-way roving fabric, most of which are used in the process of hand pasting GFRP. Requirements for roving with no twist for strong manufacture are as follows:Good zonality;The roving with no twist is forced to be dried before weaving.The tension of roving without twist is uniform, and the drape should meet certain standard.Good demulsibility of roving without twist;The penetration of roving without twisting is good.(6) in the pre-molding process, the roving without twisting is cut short and sprayed onto the predetermined shape network. Meanwhile, a small amount of resin is sprayed to fix the fiber network into shape. Then, the formed fiber network sheet is transplanted into the metal mold, and the resin is injected into hot pressing to form the product.The performance requirements for this process are basically the same as for the spray roving.
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