JPS5810318A - 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 used as a base paper roll (1@200-150 (1#I)) before slitting, or as a slit tape in the middle of winding with a paper winding machine. This relates to a method for connecting in this state.

This composite insulating tape (hereinafter simply referred to as composite tape) is, for example, a tape in which kraft paper is entirely placed on both sides of a melt-extruded plastic film made of polypropylene (P'P), polymethylpentene (PMP), polyethylene (PE), etc. , or one in which a plastic film such as fluorinated ethylene propylene (FEP) and kraft paper on both sides are completely heat-pressed.

Conventionally, these composite tapes have been connected together by a method as shown in FIG. 1. In the figure, 2] and 2+ are composite tapes to be connected, which are made by laminating kraft paper 23 on both sides of a plastic film 22. To make the connection, match the ends of the composite tape 21 and 21, and apply a thin film (20 to 100μ) on both sides of the butt.
m) All 24 pieces of kraft paper are pasted together using adhesive. Note that thin kraft paper 24 may be pasted only on one side of the mating portion.

However, in this method, since the connecting kraft paper 24 is pasted on the outside of the connecting portion, local discontinuities are likely to occur in this area. In addition, if it becomes locally thick, that part becomes locally hard, and when it passes through various rollers just before it is wound on the conductor, it cannot follow the radius of curvature of the roller, and the kraft paper for connection at the connection part becomes hard. There is a drawback that 24 is easily cut and the tape is easily cut.

In addition, when contacting I4 [; with the base paper roll as described above,
Since the thin kraft paper 24 is bonded to the outside of the connection part, generally using a natural water-soluble adhesive, the adhesive smudges through the entire connection kraft paper 24, causing either the immediate outer layer or the inner layer to bleed. Craft paper for composite tape and kraft paper for connection 2
4 can get stuck and be lazy. In particular, when the kraft paper of the composite tape is moistened and used as described in Japanese Patent Publication No. 52-38237 to prevent swelling of the composite tape in oil, even if the adhesive is initially Even if it is dry, it absorbs moisture over time and becomes soft, and eventually oozes through the entire kraft paper 24 into the outer layer or the inner layer, and as mentioned above, the composite tape has the connecting kraft paper as either the outer layer or the inner layer. It may stick to the kraft paper.

As mentioned above, when the conductor is started to be wound with a paper winding machine, the kraft paper of the composite tape on the outer layer or the inner layer is peeled off starting from the stuck point, and it no longer looks like a composite tape. There is a risk of losing it.

The present invention was made in order to solve the above-mentioned problems, and the present invention peels off and removes the other layers, leaving at least one piece of kraft paper at the end portions of the composite insulating tape on both sides to be connected. By overlapping all the kraft paper sheets and gluing the inner surfaces of the overlapped sheets, there is little local increase in thickness at the joint, the connection is strong, and the adhesive oozes out to the outside of the joint if necessary. The present invention aims to provide a complete method for connecting composite insulating tapes that can prevent this from occurring.

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 off and removing the other layers, leaving at least one sheet of kraft paper at each end of the above-mentioned tape on both sides to be connected, completely overlap the kraft papers at the above-mentioned 5-end ends on both sides, and then overlap the inner surfaces of the overlapping layers. A method for connecting composite insulating tapes, characterized in that at least one point is bonded with an adhesive.

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

Hereinafter, the present invention will be explained by examples using the drawings. FIGS. 2(A) to 2(E) are longitudinal cross-sectional views of a connecting portion for explaining an embodiment of the method of the present invention. (B) ~ (C)
In the figure, reference numerals 1 and 1' denote composite tapes to be connected, which are made by laminating kraft papers 3 and 3' on both sides of plastic films 2 and 2', respectively.

These composite tapes 1 and 1' are first connected to terminal portions 4.4' and 4.4' according to the form of each connection shown in Figures (A) to (C).
The other layers are peeled off, leaving the kraft paper 3 (or 3') on one side, or the kraft paper 3, 3 (or 3', 3') on both sides. In this case, since the adhesive strength between the kraft paper 3 (or 3') of the composite tape and the plastic film 2 (or 2') is such that it can be peeled off manually, this operation is easy.

(a) The method shown in the figure is to leave one piece of kraft paper 3.3'Q on each terminal part 4, 4' of the composite tapes 1, 1' on both sides. All the members are superimposed on each other, and the inner surfaces of the overlapped parts are all bonded together using an adhesive 5. At the time of this bonding, if heat is applied, for example, with an iron or the like, from above the kraft paper 3, the moisture in the adhesive 5 will pass through the entire kraft paper 3 and easily come out, so that the adhesive dries and hardens quickly after being applied.

As the adhesive 5, for example, natural water-soluble rubber glue, starch glue, etc. are preferable because they do not deteriorate the electrical properties after oil immersion, are inexpensive, and are easy to handle.

According to this method, there is no increase in the thickness of the joint, and since the kraft papers 3 and 3' are bonded together with the adhesive 5, the adhesive 5 penetrates into the fibers, resulting in good and strong adhesion.

(b) The method shown in the figure leaves two pieces of kraft paper 3, 3' at each end 4, 4' of the composite tapes l, 1' on both sides, and alternates these kraft papers 3, 3'i. The three overlapping inner surfaces formed by overlapping the two are pasted together with an adhesive 5.

In the case of this method as well, there is little increase in the thickness of the connection part, and since there are only three adhesive parts between the kraft papers, the connection becomes stronger.

The methods shown in Figures (a) and (b) above are suitable for cases where there is time for the adhesive to dry without the risk of it bleeding through the 3.3" kraft paper, and there is no risk of bleeding, or
Even if there is not enough time for humidity control treatment or drying with thin paper, it is fed out from a tape band in a place where it will not cause damage to the composite tape other than the connection points, such as in the paper roll of a paper roll machine. It is very effective when applied to cases such as connecting composite tapes.

However, if the adhesive is not allowed to bleed through the kraft paper 3.3' f, for example in connection with the above-mentioned rolls of base paper, the adhesive may bleed outward onto the composite tape in the outer or inner layer. If sticking causes an adverse effect, (c), ii), and 8- as shown in Figure 09 are required.

(c) In the method shown in the figure, two sheets of kraft paper are left at the ends of the tapes L and 1', as in the (b) figure, but only one in the center is left out of the three overlapping inner surfaces. can be pasted with adhesive 5.

In this way, the outside of the adhesive kraft paper 3, 3' can be
Since they are each covered with kraft paper 3', 3, the adhesive is prevented from oozing out to the outside, and there is little increase in the thickness of the connecting portion, so that sufficient adhesive strength can be obtained.

) The method shown in Figures 1 and 09 is for composite tape I +,
] As 1', each one side of kraft paper 1'3.1
The kraft paper 3' is thin (for example, about 40 μm), and the kraft paper 14.14' on the other side is thick (for example, about 7071 m). This method is applied when it is thought that the adhesive 5 will not seep through.

2) The method shown in the figure is to leave only the thin kraft paper I3 on the end 9 part 15 of one composite tape 11, and to remove the thin kraft paper 13' on the end 15' of the other composite tape 11'.
Then, the thin kraft paper 13 is placed inside the thick kraft paper 14'', and the thin kraft paper 13 is overlapped, and the overlapping inner surfaces of the thin kraft paper 13 and the thick kraft paper 14' are bonded together with an adhesive 5.

In this way, the thick kraft paper 14' is attached to the adhesive 5.
There is a risk that it will bleed to the side of the thin kraft paper 13, but since the outside is covered with the thin kraft paper 13', it will not bleed and there will be no increase in the thickness of the connection area, ensuring a sufficient connection. Provides strength.

(E) Method d shown in the figure: Tape on both sides + 1.
II' each one thick craft gi 14. +4'
They are stacked together and attached with adhesive 5 on the entire stacked inner surface.

In this way, both sides of the adhesive 5 are covered with thick kraft paper 1.
4.14', there is no risk of the adhesive 5 oozing out, there is no increase in the thickness of the connection, and the connection strength is thicker than that shown in the figure.

-I〇- The method shown in Figures (C), (2) and (E) above is as follows:
This prevents the adhesive from seeping out to the outside of the joint, so it can be applied to both composite tape splices, both in the form of the base paper roll mentioned above and in the form of slit tape that is being wound by a paper winding machine. obtain.

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

l) After peeling off and removing the other layers, leaving at least one sheet of kraft paper at each end of the composite insulating tape on both sides to be connected, completely overlapping the kraft papers at the above-mentioned ends on both sides, and the inner surface of the overlapping. Since at least one point of the tape is bonded with an adhesive, the adhesive part is a piece of kraft paper extending from the tape itself, which reduces the local increase in thickness at the bonding point and provides a strong connection. and
Therefore, the tape does not break during winding with a paper winding machine, and its properties are not impaired.

2) When adhering kraft papers together, the adhesive can be dried and solidified in a short time by, for example, ironing over the kraft paper, so workability is good and the negative effects of oozing of the adhesive can be reduced.

3) If the outside of the kraft paper coated with adhesive is covered with continuous kraft paper from the composite tape, the adhesive will be prevented from oozing out. Therefore, there is no adverse effect on the composite tape in the outer layer or the right circular layer.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a connecting portion for explaining an example of a conventional method for connecting composite insulating tapes. FIGS. 2(A) to 2(E) are longitudinal cross-sectional views of a connecting portion for explaining all embodiments of the method of the present invention. 1, 1', 11.11', 2+... composite insulating tape, 2.2'. 12, 12', 22... plastic film, 3
．． 3'. 23, 24...Kraft paper, 4. , 4', 15.
15'...terminal part, 5...adhesive, 13.13'...
...Thin kraft paper, 14.14'...Thick kraft paper.

Claims (5)

[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 off and removing the other layers, leaving at least one sheet of kraft paper at each end of the tapes on both sides to be connected, the kraft papers at the ends on both sides are overlapped, and at least one of the overlapping inner surfaces is A method for connecting composite insulating tape, which is characterized by bonding parts with adhesive. (2) The method for connecting a composite insulating tape according to claim 1, wherein only one piece of kraft paper is left on each end portion on both sides. (3) The composite according to claim 1, in which two sheets of kraft paper are left on each end portion on both sides, and three places on the overlapping inner surfaces or one place on the central overlapping inner surface are bonded with an adhesive. How to connect insulating tape. (4) The method for connecting a composite insulating tape according to claim 1, wherein the kraft paper on both sides of the composite insulating tape is thick paper. (5) The kraft paper on both sides of the composite insulating tape consists of thick and thin kraft paper, and the kraft paper left at each end on both sides is only thin kraft paper on one side and double-sided kraft paper on the other side, A method for connecting a composite insulating tape according to claim 1, wherein the overlapping inner surfaces of thick kraft paper and thin kraft paper are adhered with an adhesive, and the outside of the thin kraft paper is covered with another thin kraft paper.