JPS5810316A - Method of connecting composite insulating tape - 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 is used by being wound on the conductor of an electric cable.
A composite insulating tape made by laminating and integrating kraft paper on both sides of a plastic film is connected in the state of a base paper roll (width 200 to 1500 πm) before slitting, or in the state of a slit tape in the middle of winding with a paper winding machine. It is about the method.

This composite insulating tape (hereinafter simply referred to as composite tape) is, for example, a tape in which kraft paper is placed on both sides of a melt-extruded plastic film such as polypropylene (PP), polymethylpentene (PMP), or polyethylene (PE), or There are also products in which a plastic film such as fluorinated ethylene propylene (FEP) is bonded with kraft paper on both sides under heat.

Conventionally, these composite tapes have been connected to each other by a method as shown in FIG. In the figure, 1. 1 is a composite tape to be connected, which is made by laminating kraft paper 3 on both sides of a plastic film 2. Connect J:, Composite tape 1.1.
) Clan I/Paper 4 are all pasted together using adhesive. Note that thin kraft paper 4 may be pasted on only one side of the mating portion.

However, in this method, since the connection kraft paper 4 is pasted on the outside of the connection part, this part becomes locally thick and tends to create local discontinuities in the power cable after the conductor is wound.

As the father thickens locally, that area becomes locally hard.
When the conductor passes through various rollers immediately before being wound around the conductor, it cannot follow the radius of curvature of the rollers, and the connecting kraft paper 4 is likely to break at the contact point, causing the tape to break.

In addition, when connecting the above-mentioned base paper rolls, the thin kraft paper 4 is generally adhered to the outside of the connection part using a natural water-soluble adhesive, so the adhesive does not cover the connecting kraft paper. 4 may bleed through the entire tape, and the kraft paper of the composite tape on the outer layer or the inner layer may stick to the kraft paper 4 for connection. In particular, in order to prevent the composite tape from swelling in oil, if the kraft paper for the composite tape is moistened and used as known in Japanese Patent Publication No. 52-38237, even if the adhesive dries initially, Even if the kraft paper used for connecting
The connecting kraft paper may ooze out into the outer layer or the inner layer through the bonding layer, and the connecting kraft paper may stick to the kraft a of the composite tape in the outer layer or the inner layer, as described above.

There is a danger that it will be peeled off as a starting point and will no longer resemble a composite tape.

The present invention has been made to solve the above-mentioned problems, and by overlapping and bonding the plastic films at the end portions of composite insulating tapes to be connected, the thickness at the connecting portion is locally increased. It is an object of the present invention to provide a method for connecting a composite insulating tape that has a strong connection without causing adhesive to ooze out and adversely affecting the composite tape in the outer layer or the inner layer.

The present invention provides a method for connecting a composite insulating tape formed by laminating kraft paper on both sides of a plastic film.
After peeling and removing the kraft paper on at least one side of the end portions of each of the tapes on both sides to be connected, the exposed plastic film ends of the tapes on both sides are stacked so that they are in full contact with each other, and the inner surfaces of the overlapped layers are coated with adhesive. This is a method of connecting composite insulating tape that is characterized by adhesive bonding.

The composite insulating tape to which the method of the present invention is applied is a tape made by laminating kraft paper on both sides of a plastic film such as PP, PMP, PE, FEP, etc., as described above.

Hereinafter, the present invention will be explained by examples using all drawings 5- do.

FIGS. 2(a), 2(b), 2(c), and 2(b) are longitudinal sectional views of a connecting portion for explaining an embodiment of the method of the present invention, respectively.

In the figure, reference numeral 1.1 denotes a composite tape to be connected, which is made by laminating kraft paper 3 on both sides of a plastic film 2.

(a) The method shown in the figure is to peel off the Clann I paper 3, 3 on both sides of each end portion 5.5 of the composite tape 1.1, and overlap the exposed plastic films 2', 2' together. , the overlapping inner surfaces are all bonded together with an adhesive 6. When first peeling off the kraft paper 3 of the composite tape 1, the adhesive strength between the kraft paper 3 and the plastic film 2 is such that it can be peeled off manually (b). Peel off and cut off only the kraft paper 3, 3 on one side of the overlapping surfaces of . It is something. According to this method, it is only necessary to peel off the kraft paper 3.3 from the composite tape 1.1, so the workability is improved, but the thickness of the kraft paper 3.3 is only 1.
Increases by the number of sheets.

(C) The method shown in figure is a modification of the method shown in (B) figure.
Cut the entire tip of the plastic film 21.27 so that the kraft paper 3', 3' on the opposite side of the overlapping surface of the connection part is slightly longer than the length of the plastic film 2/, 2/, respectively, (b) Same as the figure. Attach 1 to 1, glue 6
It is pasted together. According to this method, the boundary between the plastic film 2' and the kraft paper 3 at the connection part is covered from the outside with a long kraft paper 3', so even if the adhesive oozes out from the edge of the plastic film 2', Because of the presence of the kraft paper 3', it does not directly affect the composite tape on the outer layer or the inner layer. In this case, the increase in the thickness of the bonded portion is slightly greater than that shown in FIG. 1, but less than that of the conventional method shown in FIG.

The overlapping length of the plastic films 2' and 2'i in figures (a), (b), and (c) varies depending on the thickness of the composite tape, but is generally about 5 to 20 mm.
He is often chosen as a friend.

Further, in order to prevent the adhesive 6 from overflowing from the glass films 2', 2', it is preferable to apply the adhesive 6 only to the central portion of the length of the overlapping surfaces, leaving a small amount at both ends. As the adhesive 6, for example, it does not deteriorate the electrical properties after immersion in oil,
In addition, natural water-soluble rubber glue, starch glue, etc., which are inexpensive and easy to handle, are used.

The methods shown in Figures (a), (b), and (c) above can be applied to both the above-mentioned base paper roll state and the state of slit tape in the middle of winding by a paper winding machine. applicable.

In addition, if there is no risk of the adhesive oozing through the kraft paper 3, that is, if the composite tape is not subjected to humidity control treatment, if the kraft paper 3 is thick compared to the amount of adhesive, if the kraft paper 3 is thin However, if you have enough time to dry after adhesion and there is no risk of bleeding, or if you do not have enough time to dry with humidity control treatment or thin paper, damage may occur to the composite tape other than the connection points. For example, when connecting composite tapes fed from one tape pad in a paper roll of a paper winding machine, etc., as shown in Figure 2),
(c) As shown in the figure, apply adhesive 7 to the excess portion of the kraft paper 3' and paste the kraft paper 3.3' together. According to this method, the increase in thickness is smaller than the conventional method shown in Fig. 1, and since one end of the pasted kraft paper 3' is continuous with the kraft paper 3 of the composite tape, the connection is complete. .

The method for connecting composite insulating tapes according to the present invention configured as described above has the following effects.

l) After peeling and removing the kraft paper on at least one side of the end portions of each of the composite insulating tapes on both sides to be connected, overlap the exposed plastic film end portions of the tapes on both sides so that they are in contact with each other, and then Since the tape is bonded with adhesive, the local increase in thickness at the continuation point is reduced, and the continuation is strong. It won't do any harm.

2) Furthermore, since the adhesive is applied to the inside of the plastic film, the adhesive does not ooze out to the outside of the joint of the tape, so it does not adversely affect the composite tape in the outer layer or the inner layer.

3) In the case shown in Figure 2), make the end of the composite tape longer than the length of the kraft paper-all-plastic film on one side, cover the overlapping border with excess, and then attach the adhesive 7 to - You can also paste pieces of paper together,
In this case, since one end of the pasted kraft paper is continuous with the kraft paper of the composite tape, the connection is stronger and more complete.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a connecting portion for explaining the side effects of a conventional method for connecting composite insulating tapes. FIGS. 2(a), 2(b), 2(c), and 2) are longitudinal cross-sectional views of a connecting portion for explaining the entire embodiment of the method of the present invention. l...Composite insulation tape, 2,2'...Plastic film, 3.3' 4...Kraft paper, 5
...i end, lO- 6.7...adhesive. -11- Valve 1 Diagram 2

Claims (4)

[Claims] (1) In a method of connecting a composite insulating tape made by laminating kraft paper on both sides of a plastic film,
After peeling and removing the kraft paper on at least one side of the end portions of each of the tapes on both sides to be connected, the exposed end portions of the plastic films of the tapes on both sides are overlapped so that they are in contact with each other, and the inner surfaces of the overlapping are coated with adhesive. A method of connecting composite insulating tape that is characterized by its adhesion. (2) The method for connecting composite insulating tapes according to claim 1, wherein the peeling and removal of the kraft paper is performed on the kraft paper on both sides of the end portions of the composite insulating tapes on both sides. (3) The method for connecting composite insulating tapes according to claim 1, wherein the peeling and removal of the kraft paper is performed only on the kraft paper on the overlapping surface side of the end portion of the composite insulating tape. (4) Make the kraft paper on the opposite side of the overlapping surface of the terminal part of the adhesive insulating tape slightly longer than the length of the glass film, and connect the long part by overlapping it with the kraft paper part of the above-mentioned tape on the other side. A method for connecting a composite insulating tape according to claim (3).