JPS59128286A - Manufacture of coated pipe - 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 The present invention relates to a method for manufacturing synthetic resin pipes having a fire-resistant coating.

Specifically, a water-kneaded material mainly composed of a hydraulic inorganic material is applied to the outer circumferential surface of a synthetic resin pipe or other winding core onto a woven fabric that has been partially heat-fused between the vertical and horizontal fibers. The present invention relates to a method of manufacturing a fire-resistant cladding tube to be cured.

In high-rise buildings, etc., which have many compartments vertically and horizontally, supply/exhaust pipes, supply/drainage pipes, and other electrical conduits that connect each compartment are often installed and centrally managed. Synthetic resin pipes have come to be used in place of metal pipes due to their flexibility, processability, and dew-proofing properties on their outer surfaces.

However, synthetic resin pipes, like hard vinyl chloride pipes, are usually flammable and often generate gases, which can cause damage in the event of a fire. Furthermore, it is well known that since the compartments are interconnected, if a fire breaks out in one room, the fire spreads to each room and the poisonous gas spreads, resulting in greater damage.

Recently, as a countermeasure against this problem, a method has been adopted which has been quite effective in preventing direct contact with fire by installing a covering material mainly composed of a fire-resistant inorganic material such as Portland cement on the outer peripheral surface of the synthetic resin pipe.

In the manufacturing method for the above-mentioned coated synthetic resin pipes, attempts have been made to incorporate inorganic or organic fibers to reinforce the coating material, but it is difficult to mix the fibers uniformly, resulting in uneven distribution or fiber breakage. The current situation is that it is not easy to avoid such problems.

In order to solve this problem of mixing fibers, measures were taken to reinforce the cladding material using woven fabric, especially coarse woven cheesecloth, which dramatically increased the strength of the cladding. He has been successful in this and has received awards.

A method for manufacturing a cladding tube using the above-mentioned woven fabric will be explained in more detail.

To adjust the flow condition of the woven fabric d-1 extracted from the unwinding machine, that is, to stabilize the tension in the flow direction and the width direction, and to prevent the woven fabric from sagging, wrinkling, stretching deformation, etc. by balancing it. It is preferable that the compound wood, which can be finely adjusted in the axial direction, be extracted freely or while still in contact with the surface of the drive roller and sent to the next process. A paste of a water-thermal kneaded material mainly composed of a hydraulic inorganic substance is flowed down from above on a flat plate, and is spread onto the woven fabric and adjusted to a constant thickness using a roller or a plate-shaped cloth 1/- It is normal for it to be held at par.

Paste-coated woven fabric d created in this way: Cut into a certain length with the woven fabric side or the paste side inside, and cut into synthetic resin pipes for final products such as vinyl chloride or limbs in the subsequent process. It is wound around a replaceable metal or synthetic resin winding core. After this winding, the uncured paste cladding tube is placed on two rollers of the same diameter that are positioned in 3 V of water and rotate in the same direction, in order to adjust the overall shape to a perfect circle. Thereafter, the shaped cladding tube is subjected to curing, curing, etc., and if it is not a wound core or a synthetic resin tube for the final product, it is replaced with a synthetic resin tube for the final product. .

[mentioned above] During the second process, for example, the process of cutting the woven fabric to a certain length, the process of winding it around a winding core, the process of making it into a perfect circle, and if necessary, after the above-mentioned cutting, In the process of scraping off as much cement as possible near the edges to facilitate winding and rounding, the tensile force applied to the last end of winding, and the frictional force applied to the surface of the woven fabric in the direction of the cut end. As a result, the weft threads at the cut end of the woven fabric may partially or completely fray from the warp threads.
This weft is not removed! j. remains as foreign matter on the surface of the cladding tube product, deteriorating the surface smoothness and appearance of the cladding tube.

Therefore, an object of the present invention is to prevent the weft threads of the woven fabric from fraying and to smoothen the surface of the cladding tube in the method for manufacturing the cladding tube.

As a result of intensive study on these issues, the inventors of the present invention have found that the fibers of the woven fabric used are at least partially heat-fusible fibers, and the longitudinal and lateral fibers are partially welded to achieve 4- The present invention has been completed by successfully preventing p-tearing.

That is, the gist of the present invention is to provide a method for manufacturing a coated pipe body by applying a water-thermal kneaded material containing a hydraulic inorganic material as a main component onto a woven fabric and then wrapping the mixture around the outer peripheral surface of a winding core. The woven fabric contains at least heat-meltable synthetic fibers, and the fibers are used at least scattered within the woven fabric, and the woven fabric is partially and scattered over the entire surface of the woven fabric before the application. Specifically, there is a method for producing a cladding body in which the longitudinal and lateral fibers are heated and welded.

The contents of the present invention will be explained in detail below.

The water kneaded product mainly composed of inorganic material used in the present invention, DL, Portland cement, etc., is mixed with sand or other bone particles, and if necessary, a fluidizing agent, a shape preservative, and a reinforcing agent are added. It is made by kneading inorganic or organic fiber nails (etc.) with 11 additives and an appropriate amount of water. The purpose of the cloth is to reinforce each layer of the coating and between each layer, so it is preferable that the cloth has a texture that allows the applied water-warm paste to pass through the surface to some extent. There is cheesecloth.

Suitable materials for the twisted fabric include polyester, polyamide, polyvinyl chloride, polyvinyritine chloride, and polyolefin.

Materials made of these materials include monofilament, spun yarn,
Although it is used in the form of split fibers, the spun yarn may also be a blended yarn of short fibers using these materials.

Although the monofilaments and the like mentioned above are roughly woven, they may also be mixed fiber fabrics using the various textile yarns mentioned above, but in order to achieve the object of the present invention, fibers made from the above-mentioned meltable materials are used.
It needs to be present in at least one of the warp and weft yarns, and it needs to be present at least partially and scattered over the entire surface of the woven fabric, and it is not good for it to be unevenly distributed at the edges or in the center of the woven fabric. This is an essential requirement for producing the effects of the present invention by dispersing the heat-sealed portions described below over the entire surface 1. As mentioned above, the reason why it is not necessary for both warp and weft yarns to include heat-fusible moon phases is that if one of them is heat-fused, they can stick to each other at the warp and weft intersection points.

As a means of heat fusing, it is preferable to heat the fibers in a short period of time, since fibers are usually produced by drawing, and if they are melted over a long period of time, the performance of the fibers will be lost. Cools down immediately. The heating method is the Salel Impulse Sealink method, which is commonly used for thermal adhesion of synthetic resin films, by instantaneously applying electricity to a chrome wire, etc. [method that heats the important parts]
In addition to the high-frequency sealing method suitable for vinyl chloride resin, etc., there are ultrasonic sealing methods. i
Perform dot-like shoes (n111).This heat fusion position i1.
/l must be distributed over the entire surface of the woven fabric so as not to be unevenly distributed and not to be too dense. If it becomes too dense, it will be wrapped around the cladding together with the cement paste, or the cut end of the woven fabric will not be completely adhered to the outer surface of the cladding tube.
It may bounce up and damage the appearance and functionality of the product. If it becomes too dense, it is thought to be used to check the stiffness of the woven fabric.

This will be explained below using examples.

FIG. 1 is a side view showing the process of impulse bonding cheesecloth using alternating polyethylene threads and vinylon threads for the warp threads and vinylon threads for the weft threads.

The raw fabric 2 extracted from the cheesecloth raw fabric roll 1 advances in the direction of the arrow, passes through a guide roller 3 that adjusts the tension in the traveling direction, and the tension in the d] direction, and then is woven by an impulse solar 5 on a water cooling roller 4. M”FC in the cloth is heat-sealed in a straight line and rolled up.

The above-mentioned specially pretreated woven fabric is used as a cheesecloth roll 11 in FIG. 2, and the extracted cheesecloth 12 is passed through a kite roller 13 having the same function as in FIG. Cement paste 16 is made to flow down from an upper hopper 15 while passing through, and the application area and thickness are adjusted by a scraper 17, and the cheesecloth 18 coated with the cement paste is wound around the outer surface of the winding core 19. The amount of wrapping can be changed arbitrarily by cutting the coated cheesecloth 18 at a desired position (not shown).

FIG. 3 is a plan view of the cladding tube with the end of winding facing upward according to the method of the present invention, and FIG. 4 is a corresponding plan view of the conventional method, that is, the case of cheesecloth without pretreatment Show the diagram.

In Figures 3 and 4, 3] and 4] indicate the winding core, and 32.4
2 indicates the cement-based coating layer, 3; 43 indicates the rear end of the coating, and Sd indicates the entangled weft threads. As shown in FIG. 3, no fraying of the weft threads is observed when the method of the present invention is practiced.

[Brief explanation of drawings]

Fig. 1 shows a side view of the woven fabric treatment process, Fig. 2 shows a side view of the process of manufacturing a cladding tube using the treated woven fabric and paste, and Fig. 3. , a plan view of a cladding body when carried out by the present invention and the conventional method, respectively. Applicant for permission: Showa Denko Co., Ltd. Agent Sei Kikuchi

Claims (1)

[Scope of Claims] A method of manufacturing a coated tube by applying or after applying a water-kneaded material containing a hydraulic inorganic material as a main component onto a woven fabric and wrapping it around the outer peripheral surface of a winding core, the woven fabric comprising: At least heat-meltable synthetic fibers are used, and the fibers are used at least dispersedly within the woven fabric, and before the application, the woven fabric is partially and scatteredly spread vertically and horizontally over the entire surface of the woven fabric. A method for manufacturing a cladding tube body, characterized by performing heat welding treatment between fibers.