CN103527863A - Fiber guide pipe with far-infrared heating function - Google Patents

Abstract

A kind of fiber guiding pipe with far-infrared heating function provided by the present invention, the pipe wall is from outside to inside by 1-skin; 2-insulating layer; 3-reflecting layer; 4-heating layer; Layer composition, in which 4-heating layer contains 5-carbon fiber heating wire. The insulation layer is a 100% closed-cell polymethacrylimide (PMI) rigid foam, with a heat distortion temperature of 180-240°C, high specific strength and specific stiffness, and plays a role in heat insulation, heat preservation, and support for fiber guide pipes The heating layer is an electrothermal conversion layer containing carbon fiber heating wire made of pure black body material; the inner lining layer is a polymer layer with self-lubricating effect, which mainly plays the role of reducing the friction between the conveying fiber and the guide tube. The far-infrared heating functional fiber guide tube of the present invention has the characteristics of rapid temperature rise, uniform heat generation, and long service life. It can heat up to 135°C within 3 minutes, and meets the needs of rapid heating of light-weight and high-strength composite materials for online forming and continuous feeding of fibers.

Description

A fiber guide tube with far-infrared heating function

technical field

The invention relates to a fiber guide tube with far-infrared heating function, which belongs to the field of composite material forming.

Background technique

The direct online forming technology of lightweight high-strength composite materials refers to blending, impregnating, and effectively compounding long fibers, resins, and functional fillers in twin-screw equipment, and then directly compounding them through processes such as accurate weighing, heat preservation and transportation, and rapid molding. Material products, this process has the advantages of high production efficiency, high degree of automation, flexible process adjustment, high product strength, strong designability, and low cost. Compared with the traditional composite material manufacturing technology, the direct online forming technology of lightweight high-strength composite materials saves intermediate process links, and can directly purchase basic raw materials for one-time processing and molding without the need for semi-finished product processing. The fiber length and fiber distribution of the formed parts are controllable Uniform, can provide more excellent strength, hardness, impact resistance, fatigue resistance, and can replace existing steel structural components in the fields of automobiles, construction machinery, ships, and construction.

In order to ensure controllable fiber length and fiber distribution in lightweight high-strength composite products, heating treatment is required before the fibers are continuously fed into the twin-screw equipment during the mixing process. The heating temperature range for fibers is 80~150°C according to the different resin matrix. . Foreign equipment uses heating rollers to heat the continuous feeding fiber, which has problems such as fast heat dissipation and high energy consumption. At present, there are relatively few domestic researches on fiber continuous feeding heating equipment.

Contents of the invention

Aiming at the requirements of the direct online forming process of lightweight and high-strength composite materials on the rapid heating of feeding fibers, the present invention provides a fiber guide tube with far-infrared heating function, which can realize rapid heating while continuously conveying fibers, thereby meeting the requirements of light weight and high-strength composite materials. The on-line forming process of high-strength composite materials is required to achieve the purpose of improving the mechanical and mechanical properties of formed parts.

A kind of fiber guiding pipe with far-infrared heating function provided by the present invention, the pipe wall is from outside to inside by 1-skin; 2-insulating layer; 3-reflecting layer; 4-heating layer; Layer composition, in which 4-heating layer contains 5-carbon fiber heating wire.

The insulation layer is a 100% closed-cell polymethacrylimide (PMI) rigid foam with a heat distortion temperature of 180-240°C, high specific strength and specific stiffness, and plays a role in heat insulation, heat preservation and support The role of the fiber guide tube;

The heating layer is an electrothermal conversion layer containing carbon fiber heating wire made of pure black body material, with a temperature resistance of ≥ 280°C and an electrothermal conversion efficiency of ≥ 95%;

The inner lining layer is a polymer layer with self-lubricating effect, including one or more of polyphenylene sulfide PPS, epoxy resin, polyimide PI, polytetrafluoroethylene PTFE, polyetheretherketone PEEK The film-like material composed mainly plays the role of reducing the friction between the conveying fiber and the guide tube;

The skin is formed by coating one or more materials of polypropylene, polyvinyl chloride, polyphenylene ether, and polystyrene on the outside of the insulation layer;

The reflective layer is a film-like material with bright surface formed by aluminum or its oxide.

The present invention uses closed-cell polymethacrylimide (PMI) rigid foam as the insulation layer of the fiber guide pipe, which has the highest specific strength and specific stiffness in the same foam density, and can play a role in supporting the fiber conveying pipe. Function, to ensure that the fiber delivery pipe does not deform or bend; the thermal deformation temperature of the insulation layer is as high as 180-240°C, and its creep compression is less than 2% at 180°C and 0.7MPa pressure, which can meet the fiber heating temperature range of 80-150 The heat preservation and heat insulation needs in ℃.

In order to meet the needs of rapid heating of continuous feeding fibers, the invention adopts pure black body material carbon fiber heating element to form the heating layer of the conveying pipe, and the far infrared rays emitted by it are easily absorbed by fibers and water, so that the moisture in the fibers is completely removed during the conveying process , so as to effectively avoid product defects. In addition, the more important thing is that the carbon fiber heating element has the advantages of rapid heating, uniform heating, fast heat exchange, high temperature resistance, high heat capacity, long service life, and power can be adjusted at will, etc. It is suitable for lightweight and high-strength composite materials. The requirements of heating conditions ensure that the fiber enters the twin-screw barrel at a similar temperature to the molten resin, thereby controlling the temperature fluctuation of the melt in the barrel to the lowest range, which is conducive to satisfying the full infiltration and coating of the fiber by the resin and the fixed length of the fiber. Cutting, uniform distribution of fibers and other process requirements.

Description of drawings:

Fig.1 Schematic diagram of the cross-section of a fiber guide tube with far-infrared heating function

In the figure: 1-skin; 2-insulation layer; 3-reflection layer; 4-heating layer; 5-carbon fiber heating wire; 6-inner lining.

Detailed ways:

In order to better understand the present invention, the present invention will be further explained below in conjunction with the accompanying drawings and examples, but it should be clear that the protection scope of the present invention is not limited to the scope indicated by the examples.

As shown in the figure, the fiber guide tube with far-infrared heating function of the present invention, the tube wall from the outside to the inside is the skin formed by polyvinyl chloride film, 100% closed-cell polymethacrylimide (PMI) rigid foam Insulation layer composed of metal aluminum, reflective layer directly calendered into thin sheets, electrothermal conversion heating layer containing carbon fiber heating wire, inner lining layer formed of polytetrafluoroethylene with self-lubricating function, fiber guide tube outer diameter 3~ 8cm, inner diameter 2~5cm, after 3 minutes of electrification, the temperature inside the fiber guide tube is 135°C.

Claims (6)

1. a fiber guiding duct with Far-infrared Heating function, is characterized in that, the described fiber guiding duct with Far-infrared Heating function, and tube wall is from outside to inside by 1-covering; 2-thermal insulation layer; 3-reflecting layer; 4-zone of heating; 6-inside liner, totally five layers of composition, wherein comprise 5-carbon fiber heating silk in 4-zone of heating.

2. a fiber guiding duct with Far-infrared Heating function, is characterized in that, described zone of heating is the electric heating transfer floor that contains black body material carbon fiber heating silk, heat resistance >=280 ℃, electric conversion efficiency >=95%.

3. a fiber guiding duct with Far-infrared Heating function, it is characterized in that, described thermal insulation layer is a kind of 100% closed pore Polymethacrylimide (PMI) rigid foam, heat distortion temperature is 180-240 ℃, specific strength and specific stiffness are high, play effect heat insulation, that be incubated, support fiber guiding duct.

4. a fiber guiding duct with Far-infrared Heating function, it is characterized in that, described inside liner is the macromolecule layer with self-lubricating function, comprise polyphenylene thioether PPS, the film-form material of one or more compositions in epoxy resin, polyimide PI, polytetrafluoroethylene PTFE, polyether-ether-ketone PEEK, mainly plays the effect that reduces conveying fiber and guide pipe friction.

5. a fiber guiding duct with Far-infrared Heating function, is characterized in that, for one or more materials in polypropylene, PVC＝polyvinyl chloride, PPO＝ polyphenylene oxide, polystyrene are coated in, thermal insulation layer is outside to be formed described covering.

6. a fiber guiding duct with Far-infrared Heating function, is characterized in that, described reflecting layer is the surface-brightening film-form material that aluminium or its oxide form.

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