JPS6353939B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a composite insulating tube, and more particularly, to a method for manufacturing a composite insulating tube that allows long tubes to be continuously obtained. Conventionally, the method for manufacturing this type of insulating tube is to wrap a raw insulating tape cut to the desired width around a core rod with a predetermined outer diameter to the required thickness.
An insulating tube has been manufactured by fixing the last terminal with adhesive tape, for example, to form a tube, and then pulling out the core rod from the tube body. However, in this method, the length of the core rod used is This limits the length of the insulating tube. In addition, an insulating tape with a relatively small width adhesive is used around the core rod, and after it is rolled diagonally by a length L in a fryer, the core rod is heated and the wound tape is bonded to each other. In this manufacturing method, the core rod is pulled out from the formed tube body. Even with this method, the length of the insulating tube that can be manufactured is limited by the length of the core rod used as a practical matter from the point of view of pullability.
If the core rod is made too long, it will be very difficult to pull it out. In any case, this conventional method has many drawbacks, such as not being able to produce long objects and being not a continuous method, resulting in poor efficiency and high costs. The present invention aims to eliminate the above-mentioned drawbacks and provide a manufacturing method for continuously producing long products, and furthermore, so-called endless composite insulating tubes. A guide cap 4 is disposed coaxially with a core rod 2 having an outer diameter dimension and a substantially circular cross section, with a lower layer raw material insulating tape 3 vertically attached to the core rod 2 from the longitudinal direction thereof.
and the surface of the core rod 2 to form a tube-shaped body rolled up in the longitudinal direction along the surface of the core rod 2, and on top of the tube-shaped body 6, an upper layer raw material insulating tape 7 is drawn. a step of continuously winding the tape horizontally diagonally, a step of continuously applying an adhesive or a solvent that swells the raw material tapes 3 and 7 to the surface of the formed tube-like body, and then heating the tape in a heating furnace 8.
The method is characterized in that it consists of a process in which the insulating tube 1 is continuously passed through the core rod 2 and then heated to a desired temperature to harden the adhesive, and the formed insulating tube 1 is continuously extracted from the core rod 2 (see FIGS. 1 and 2). (See Figure 2). That is, as shown in FIGS. 1 and 2, a core rod 2 having the inner diameter of the intended insulating tube 1,
From the gap 5 between the core rod 2 and the base 4 of the guide 9 that guides the lower layer raw material insulating tape 3 fixed substantially coaxially with the core rod 2 into the heating furnace 8, The lower layer forming insulating tape 3 supplied vertically is pulled out, vertically applied to the core rod 2 and formed into a tube shape, and then the upper layer insulating tape 7 is wound horizontally thereon by a flyer 10. At this time, the tape 7 in the upper layer is wound horizontally around the tape 6 in the lower layer by taking off the longitudinally attached tape (that is, the tube-shaped tape 6 formed by rolling) at a predetermined speed.
Further, an adhesive such as a solvent or varnish is applied to the outer surface of the horizontally wound tape 7 before it enters the heating furnace 8, and then the tape 7 is passed through the heating furnace 8. As a result, the solvent (which usually swells the tape material) or varnish applied to the surface permeates between the tapes or through the tape and passes through the heating furnace 8, thereby forming the lower layer vertically spliced tape 3 and the upper layer horizontally wound tape 7. Glue and integrate. In the case of this method as described above, since the solvent or varnish does not permeate to the inner surface of the insulating tape 3 vertically attached to the core rod 2, that is, the surface of the core rod 2, the lower layer tape 3 is constantly applied to the surface of the core rod 2. Since it can be slid (that is, taken off), it can be continuously taken out as a tube 1 (see FIG. 2) by winding the tape 7 horizontally thereon. In this case, the coating device 11 is used to apply the solvent or adhesive such as varnish, and the solvent or adhesive is applied to the supply pipe 1.
2 to this coating device 11. In addition, if the above-mentioned vertical tape 3 is a normal type and the upper layer tape is an adhesive type tape or a so-called prepreg tape,
The adhesive or solvent applicator 11 in FIG. 1 is no longer necessary. Alternatively, a tape coated with an adhesive may be used on the outside of the lower layer vertically attached tape 3, and an ordinary type of tape may be used as the upper layer tape 7. In this case as well, the device 11 for applying an adhesive such as varnish or a solvent becomes unnecessary. Furthermore, if the core rod 2, the guide 9, and the base 4 are made to have rounded corners and are compatible,
It also becomes possible to manufacture insulating tubes with a rounded rectangular cross section. Next, the present invention will be further described with reference to examples. Example 1 As shown in FIGS. 1 and 2, a tube made of polyamide woven fabric was obtained by the method described above under the following conditions. That is, a polyamide nonwoven fabric tape (trade name Nomex) is used as the lower layer raw material tape 3, and while it is vertically attached to a core rod 2 having a circular cross section, the gap 5 between the guide cap 4 and the core rod 2 is
On the tube-like body 6 formed by taking it through,
As the upper layer tape 3, a polyamide nonwoven fabric (trade name Nomex) tape was continuously wound diagonally horizontally.
An epoxy adhesive was continuously applied to the surface of the formed continuous tube-like body using a coating device 11. Next, this was passed through a heating furnace 8 at a temperature of 200° C. and heated to harden the adhesive, and then the formed tube 1 was continuously extracted from the core rod 2, cooled, and then cut into a desired length. The main conditions for this production are shown in the table below. (1) Raw tape material (a) Raw material insulating tape for lower layer: Polyamide non-woven fabric (Nomex 410), 5 mil thick (b) Raw material insulating tape for upper layer: Polyamide non-woven fabric (Nomex 410), 2 mil thick (2) ) Adhesive Epoxy adhesive (3) Core rod diameter 10mmφ (4) Tube drawing speed 5 m/min (5) Furnace temperature 200°C Next, the properties of the composite insulation tube obtained are as shown in the table below. be.

【table】

[Table] Example 2 As shown in Figures 1 and 2, Example 1
A tube made of polyimide film was obtained in substantially the same manner as above under the following conditions. The main requirements for this production are as shown in the table below. (1) Material of raw tape (a) Raw material insulating tape for lower layer: Polyimide film (product name: Kapton)
300H) (b) Raw material insulating tape for upper layer: Polyimide tape with adhesive (product name: Kapton) (2) Core rod diameter: 10mmφ (3) Tube drawing speed: 5m/min (4) Furnace temperature: 350℃ Next The properties of the obtained polyimide tube are shown in the table below.

【table】

[Table] As is clear from the above examples, the present invention has the following effects. That is, (a) a continuous long insulating tube can be obtained. For example, it was previously impossible to make thick and long aramid tubes or polyimide tubes without a core, but now it is now possible. (b) Manufacturing speed can be increased and work efficiency is high. (c) A thick insulating tube can be easily obtained by using a relatively thick insulating tape for the lower layer and a thin insulating tape for the upper layer.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a manufacturing process in an embodiment of the present invention, and FIG. 2 is a schematic perspective view of a product tube during the manufacturing process. DESCRIPTION OF SYMBOLS 1... Insulating tube, 2... Core rod, 3... Lower layer raw material insulating tape, 4... Guide cap, 5... Guide cap 4 disposed coaxially with core rod 2, and the surface of core rod 2. Gap, 6... Tube-shaped body formed by rolling, 7... Upper layer raw material insulating tape, 8... Heating furnace, 9... Guide for vertically attaching the lower layer tape 3, 10
...Fryer, 11...Adhesive or solvent applicator, 12...Adhesive or solvent supply pipe.

Claims (1)

[Claims] 1. In a method of continuously manufacturing an insulating tube using a raw material insulating tape for a lower layer and a raw material insulating tape for an upper layer, the inner diameter dimension of the desired insulating tube is approximately the outer diameter dimension. A lower layer raw material insulating tape is placed vertically on a core rod having a substantially circular cross section from the longitudinal direction of the core rod, and is pulled out through the gap between a guide cap disposed coaxially with the core rod and the surface of the core rod. forming a tube-like body rounded along the surface of the core rod in the direction of the core rod, and continuously winding the upper layer raw material insulating tape diagonally horizontally on the tube-like body; The process of continuously applying an adhesive or a solvent that swells the raw tape itself to the surface as necessary, and then continuously passing it through a heating furnace and heating it to a desired temperature to harden the adhesive. A method for manufacturing a composite insulating tube, comprising the step of continuously extracting the insulating tube from the core rod.