JPS60502012A - Method of gluing a layer of permeable material onto a support consisting of a plurality of interconnected threads and papermaking felts and filter fabrics produced by this method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Method of gluing a permeable forest material layer onto a support consisting of a plurality of interconnected threads Paper machine felt and P city manufactured by this method Water invention adheres a layer of permeable material onto a support consisting of multiple interconnected threads It pertains to the method for

A method of this kind is disclosed in document GB-A No. 994914.

In this method, the support is made of special thermoplastic threads, and these threads are removed before the permeation layer is applied. Heat to melt.

In this method, a part of the special thread is completely dissolved, so the structure of the support is 8L has the disadvantage of being destroyed. Furthermore, when the thread is completely melted, the melting heat This will cause the plastic material to spread unevenly between the remaining threads of the support and the permeable material layer. There may be imperfections in the adhesion.

The method of the present invention does not have these drawbacks, and the method of the present invention does not have these disadvantages and does not require the use of a core and other threads during the formation of the support. One side is equipped with a special thread consisting of a thermoplastic outer part with a low melting point. , heat this side until the outer part of said special thread melts, and then apply a layer of permeable material. It is characterized by being placed on this surface.

When the special threads are heated, only the outer part melts and the core of these threads and the permeable material layer are separated. combine. Therefore, the support is not partially damaged, and the support and the permeation layer are are joined extremely reliably.

The present invention is characterized in that the permeable layer avoids marking of the paper especially due to the effect of pressure and It is extremely suitable for the production of papermaking felt, which plays a role in transporting the water extracted from paper. are doing.

Papermaking felt typically consists of a layer of permeable material made of multiple fibers bonded together by threads. Planting on woven supports is produced by mechanical fixation. This is document DT- The same applies when the support and the permeable layer are further bonded as described in Δ1807329@. It is the same.

The fer 1 manufactured in this manner has various drawbacks.

First, the permeability was reduced due to the introduction of fibers into the support.

Second, the permeable material layer becomes denser, forming many small funnel-shaped areas at the point where the sword is inserted. be done.

Thirdly, I, where the support is damaged by the sword: the life to Mefel 1 is shortened. Moreover, it becomes easy to deform.

In addition, before planting, connect means (the felt forms an endless belt) to the support. This may include loops, spirals, etc. connected by retaining members. The connecting means is damaged by the needle. Furthermore, after planting, fibers are inserted into the connecting means. Because of the presence of fibers, it is difficult to insert the holding member during connection.

If the method of the present invention is adopted, for example, threads that are resistant to chemical deterioration can be used. The desired support can be selected, even if the toughness of these yarns is quite low. There is no risk that this toughness will further deteriorate as a result of attachment and fall below permissible limits.

Another application is to prevent deformation of the felt during rotation or wear when rollers come into contact with each other. Extremely resistant supports can be selected without risk of partial damage during implantation .

In papermaking felts the weft threads preferably constitute the weft threads of said heating surface and therefore these The threads are perpendicular to the felt feeding direction.

In this way, the support and the permeation layer will be in close contact with each other, which will help the felt move. Stresses between the permeable layer and the support due to sag are maintained at low levels.

As a variant, the special threads can also be arranged in the warp direction, ie in the felt feeding direction.

If the felt is scorched, the contact points between these warp yarns and the permeable layer will cause damage to the felt as it moves. Stresses between the permeable layer and the support due to sag are maintained at low levels.

The method of the invention is particularly advantageous when the support imparting mechanical properties is provided with connection means. is a J1 type in which the permeation layer functions to retain impurities through the liquid or gas. In the production of 1j, 2 is also used with great advantage.

Furthermore, if the present invention is used, there is no need to use a relatively expensive implantation machine. Please note.

The invention will now be described in more detail with reference to specific embodiments illustrated in the accompanying drawings. I will clarify.

Figures 1 and 2 represent the support and layers used in the method of the invention.

FIG. 3 schematically shows an apparatus for carrying out the method of the invention.

The support body 20 is woven with 8 threads per cycle (p6riode h1 warp threads 1', 2 ’, 3’, 4’, 5°, 6’, 7° 18” and weft 1.2.3.4.5.6.7 ．． 8.9.10. N.

12... (see Figure 1).

On the front side of the support 200, on the upper surface 21 of the barrel, as shown in the ■-■ cross-sectional view (Fig. 2). The weft threads 1, 3, 4, 6, 7, 9, 10.12 (i.e. 3 underwater 2 threads) stand out as if Ru.

Conversely, the lower surface 22, which is the back side of the support 20, has the remaining weft threads 2, 5, 8°11 (immediately (1 in 3) are placed under the warp threads.

The raised weft yarns 1.3.4.6, 7.9.10.12 are composite monofilament 1~Special It is a special thread. These threads are made of polyamide 6 around the core 24 of the polyester. 25. Other warp threads 1', 2', 3'.

4', 5', 6", 7', 8' and weft threads 2.5.8.11 are made of polyester be done.

To obtain these composite yarns, the process is carried out by extrusion, weaving or core coating. obtain.

Polynisder has a melting point of 230°C, and polyamide 6 has a melting point of 180°C.

The support may be formed by weaving, knitting, helical thread binding, and the like.

The composite special thread is composed of one or more monofilaments or a plurality of cut threads. It can be a core made of thin fibers and a ql-sheath or a plurality of threads wrapped around the core; It is composed of a pericardial outer portion having a lower melting point than the other supporting fibers.

Therefore, even if the outer part melts, the mechanical properties of these special threads are retained.

Since there are no restrictions due to implantation, the permeable material layer can be adapted to the desired properties of the final product. selected.

This layer 26 consists of a plurality of continuous or may be composed of discontinuous fibers.

This layer is also permeable or made permeable to fluids! , two extruded fills It can also be composed of multiple systems.

The support 20 may have a connecting means 23 (loop, spiral, etc.) at each tip. .

An apparatus for carrying out the invention (FIG. 3) includes heating means, such as infrared radiation 30; one roller 31, 32, a heated cylindrical roll 33 and two return rollers 34. ．． 35 and a tensioner 36.

The roller 31 has a fixed shaft, and the roller 32 contacts the tenth roller 31.

The permeable layer 26 is wrapped around a cylinder [coal 37].

The support is placed on the rollers 34, 35 and on the tensioner 36-1, and It passes between the rollers 31 and 32 and the periphery of the cylindrical roll 31 and covers it.

The cylindrical roll 31 is driven.

The support surface 21 (orthogonal to the feed direction) with the special thread melts the outer part of the special thread. passing under the heating means 30 that heats the surface of the Ru. The permeable layer 26 is pressed by rollers 32 against said surface 21 with molten threads. . After passing through the rollers 31.39, the layer 26 is now attached to the support 21; Layer 26. 'The support 21 assembly moves over the periphery of the cylindrical roll 33 (layer 26 contacts the roll 33). This roll 33 has a low temperature to make the surface condition 01-. Of course, at the beginning and end of the operation, the 1° Care must be taken to ensure that the tips of the transparent layers do not overlap.

If special threads are provided on both sides 21 and 22 of the support 20, the layers 26 can be bonded one on each side. 1. In the case of papermaking felt, special threads are shown in the accompanying drawings. It is preferable to arrange the weft direction (perpendicular to the felt feeding direction) as shown in FIG.

Special threads are warp 1', 2', 3', 4', 5°16°, 7", 8" It is also possible to arrange it in the direction of , that is, in the feeding direction of the felt 1.

No matter which direction it is placed, between the nonyl 1 and the permeation layer 26 and the support 21 during movement. Flexural stress decreases.

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Claims (1)

[Claims] 1. A plurality of yarns (1", 2', 3', 4", 5', 6°, 7' , 8'. 1, 2.3.4.5.6.7.8.9.10.11.12) A method for adhering a layer of permeable material (26) to a support (20), the method comprising: 20) When forming the core (24), the core (25) and other threads (1', 2', 3°, 4' , 5', 6', 7°8', 2,5. -8.11) Thermoplastic outer surface with lower melting point A special thread having part (25), (1, 3, 4, 6, 7, 9, 10, 12) The special threads (1, 3, 4, 6, 7, 9, 10 , 12) until said surface (21) is melted, and then Placing said layer (26) on said surface (21)? ◇Method for characterizing Hikoτ. 2. The special threads (1, 3, 4, 6, 7, 9, 10, 12) are the core of polynis pull (2 4) and an outer part (25) consisting of a polyamide sheath 6 and another thread (1, 12 ’, 3’, 4°, 5’, 6°, 7’, 8°, 2, 5, 8.11) are polyester (21) is heated at a temperature of approximately 200°C before placing the layer (26). The method described in scope 1 of the request. 3. Before fixing the layer (26), the support (20) is provided with a connecting means (23). The method according to claim 1 or 2←2, characterized in that: 4. Paper machine ferrule manufactured by the method according to any one of claims 1 to 3. Luto. 5. The special thread follows the weft thread on the surface (21) in a direction perpendicular to the felt feeding direction. 4. The felt according to claim 4, characterized in that the felt is arranged as follows. 6. The special yarn is arranged in the felt feeding direction according to the warp of the support (20). The felt according to claim 4, characterized by: 7. P cloth produced by the method according to any one of claims 1 to 3.