RU2364505C1 - Device for web material impregnation - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention is attributed to equipment for impregnation of elongated web material, predominantly of fabric type, with thermoplastic binding substance in molten condition. Technical result is achieved in the device for web material impregnation. The device contains release unit for web material, bonding substance feed facility, preheater and impregnation facility. Impregnation facility includes top and bottom located horizontally heated plates with wave-shaped projections and mating cavities on facing surfaces. Also device for impregnation contains material transport and take-off mechanism including mandrel mounted on drive-shaft. In addition in projections of top plate, through channels are made, and at the exit from impregnation facility, accumulating chamber for molten boding substance is created.

EFFECT: providing reliable bonding for winds of prepreg being spooled on take-up drum and thereby forming tube-shaped product in single process with web material impregnation.

2 cl, 2 dwg

Description

The invention relates to equipment for the impregnation of long tape material, mainly woven, with a thermoplastic binder in the molten state.

A device for the impregnation of a tape fibrous material, including the dispensing mechanism of the material, a means for supplying a binder, a means of impregnation and a mechanism for drawing and selecting material, SU 1217864.

This device does not provide sufficient strength of the impregnated material due to uneven and unreliable adhesion of the binder to the filler. Under the action of the stationary rolls of the impregnating device, the binder in the bulk is squeezed out onto the outer surface of the layers in places with the least resistance to bursting, as a result of which the layers are impregnated unequally in area, areas of the filler are not wetted by the binder, air bubbles form and then remain upon solidification. In addition, it is difficult to impregnate the fibers from the outer sides of the filler, which also leads to a decrease in the strength of the resulting product - prepreg.

A device is known that includes a tempering mechanism of tape material, forced means for supplying a molten binder, impregnation means — extruder heads, heaters, smoothing rolls, RU 2051033.

The disadvantage of the device described in RU 2051033 is the fact that the impregnation is carried out only on one curved surface, namely on the surface of the extruder head. This causes, especially in the case of a woven material, the presence of sections of the material that are not wetted by the molten binder, which sharply worsens its quality and, accordingly, the quality of the products obtained from it.

This disadvantage is eliminated in the device for impregnating the tape material containing the tempering mechanism of the tape material, means for supplying a binder, an impregnating means including upper and lower horizontally located heated plates with wave-shaped protrusions and their corresponding depressions on the surfaces facing each other, as well as a pulling mechanism and material selection, RU 2054355.

The specified technical solution is made as a prototype of the present invention.

Due to the forcing of the material through several pairs of "protrusion-trough" and, accordingly, the repeated introduction of the molten binder provides a more uniform impregnation of the material, repeated extraction and removal of air inclusions. This greatly improves the quality of the prepreg.

However, this device does not provide a sufficient amount of binder on the surface of the prepreg, as a result of which there is no connection of the prepreg turns wound on the drum (mandrel); these turns are practically not interconnected, as a result of which the prepreg wound on the drum does not form a tubular product in a single process with the impregnation of tape material.

The objective of the present invention is to provide reliable bonding of the turns of the prepreg wound on the receiving drum (mandrel), and thereby forming a tubular product in a single process with the impregnation of the tape material.

According to the invention, in a device for impregnating a tape material containing a tempering mechanism of the tape material, a binder supply means, a pre-heater, an impregnation means comprising upper and lower horizontally arranged heated plates with wave-like protrusions and corresponding cavities on facing surfaces, a pulling mechanism and material selection, including a mandrel mounted on the drive shaft, through channels are made in the protrusions of the upper plate, and at the output impregnating means is formed in the upper collection chamber plate molten binder; under the mandrel is placed a clamping heater equipped with a reciprocating drive.

The applicant has not identified sources containing information about technical solutions identical to the present invention, which allows us to conclude that it meets the criterion of "novelty."

The invention is illustrated by drawings, which depict:

figure 1 - diagram of the device;

figure 2 - means of impregnation in longitudinal section.

A device for impregnating a tape material comprises a tempering mechanism, which is a spool 1 with a roll of tape material 2, in a specific example, fiberglass. Through the bypass roller 3, the tape material is fed to the means of supplying the binder 5 in the solid state (granules, powder), which is a hopper 4. The binder 5 in a specific example is polyethylene terephthalate. A pre-heater 6 is located under the dispensing hopper 4. The material impregnation device includes upper 7 and lower 8 horizontally located heated plates with wave-shaped protrusions 9 and their corresponding depressions 10 on surfaces facing each other. The upper plate 7 contains a heating element 11, the lower plate 8 contains a heating element 12. The material drawing and selection mechanism comprises a mandrel 14 mounted on the drive shaft 13 (drive motor not shown). Through channels 15 are provided with through channels 15 having an inclination downward along the tape material 2. At the exit of the impregnation means, a storage chamber 16 of the molten binder is formed in the upper plate 7. Under the mandrel 14 below the place of entry of the tape material 2 there is a clamping heater 17 provided with a drive that allows the reciprocating movement of the clamping heater 17 (the drive is not shown in the drawings).

The device operates as follows.

The drive shaft 13 rotates the mandrel 14, while the tape material 2 is wound from the spool 1 and wound on the mandrel 14. After passing the bypass roller 3, the material 2 is heated by the preheater 6 to the melting temperature of the binder 5. The binder 5 is fed from the hopper 4 to the moving tape the material 2 sticks to it and melts before the entrance to the gap between the upper 7 and lower 8, the horizontally located heated by means of the heating elements 11 and 12. From this gap, the molten binder 5, together with the moving tape material 2, arrives at the first protrusion 9 of the plate 7 as it moves, and also fills the first of the channels 15. At the protrusion 9, the binder 5 is pressed and pressed through the material 2 into the first of the depressions 10 of the lower plate 8. The binder that has passed through the material 2 is carried away by the moving material 2 to the next protrusion 9, the binder 5 is again pressed and pressed through the material 2 into the next cavity 10, and this happens on each pair of "protrusion-cavity". In the depressions 10, a certain amount of molten binder 5 is accumulated, and due to the movement of the material 2, excess pressure arises in the depressions 10, which contributes to the effective comprehensive impregnation of the material.

The binder that fills the first channel 15 along the movement of the material 2 enters the corresponding cavity 10 of the upper plate 7, but does not push through the material 2, but enters the next channel 15, then into the next cavity 10 of the plate 7 and so on until it enters the storage chamber 16 and filling it. From the chamber 16, the binder 5 enters the surface of the impregnated material 2, which is wound on the mandrel 14. The thickness of the layer of the binder coming from the chamber 16 to the surface of the material 2 is controlled by the width of the exit slit of the chamber 16. Due to this layer, the coils of the tape impregnated with the binder are firmly connected to each other. material 2, this forms a tubular product 18 on the mandrel 14 in a single process with the impregnation of the material.

The pressing heater 17 is pressed against the material 2 on the mandrel 14 by means of a drive, while it maintains the set temperature of the binder 5 and also extrudes air bubbles from the formed tubular product 18. In addition, the excess binder 5 is removed due to the clamp during the formation of the tubular products 18. The thickness of the layer of the binder 5 between the turns of material on the mandrel 14 is regulated by changing the clamping force of the clamping heater 17.

A tubular product made in this way is removed from the mandrel 14 and can be immediately used for its intended purpose.

To implement the claimed device, conventional structural materials and factory equipment are used. These circumstances allow us to conclude that the invention meets the criterion of "industrial applicability".

Claims (2)

1. A device for the impregnation of tape material containing the dispensing mechanism of the tape material, a binder supply means, a pre-heater, an impregnation device comprising upper and lower horizontally arranged heated plates with wave-like protrusions and their corresponding depressions on surfaces facing each other, a pulling and selection mechanism material, including a mandrel mounted on the drive shaft, characterized in that through channels are made in the protrusions of the upper plate, and at the output impregnating means is formed in the top plate storage chamber of molten binder. 2. The device according to claim 1, characterized in that under the mandrel is placed a clamping heater equipped with a reciprocating drive.

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