JP4162339B2 - Inner core for cold shrink tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner core for a cold-shrinkable tube that is used when a conductor exposed portion or the like of a connection portion of an insulation-coated wire is covered with a cold-shrinkable tube.
[0002]
[Prior art]
The room temperature shrinkable tube is a rubber tube, and is covered for insulation, protection, and waterproofing of the connection part of the insulation coated wire in the distribution line, etc., but before covering the wire connection part, The inner core which is a cylindrical body is inserted to keep the diameter expanded. In this type of conventional inner core, a hard plastic such as polypropylene or polyethylene is used as a material.
FIGS. 1 to 3 are views of an inner core for a general cold-shrinkable tube as an outer shape, (A) is a side view of the inner cores 1, 2, and 3, and (B) is an inner core 1, 2, 3 is a side view of a state in which 3 is fitted to the cold shrink tube 4. FIG.
The inner core 1 of FIG. 1 that is common to the present invention and the conventional example has a configuration in which a plastic tape 5 is hermetically wound in a spiral shape and adjacent portions are partially welded. Reference numeral 6 denotes a welded portion as a conventional example. The inner core 1 is fitted into the cold shrink tube 4 as shown in FIG. 1 (b) and held in an expanded state. After covering the electric wire connecting portion with the cold shrink tube 4 expanded in diameter by the inner core 1, when the end portion 5a of the tape 5 of the inner core 1 is pulled, the welded portion is sequentially broken from the left end side of the figure and the tape 5 is wound. As a result, the entire inner core 1 is pulled out from the cold shrink tube 4, and the cold shrink tube 4 tightly covers the wire connection portion.
[0003]
The inner core 2 in FIG. 2 has a configuration in which a spiral groove 7 is formed on the outer peripheral surface (or inner peripheral surface) of a plastic cylindrical body, and is molded using a mold having a spiral groove. When the end of the spiral cut piece 8 that is torn along the groove 7 is pulled at the end face of the cylindrical body (the left end side in FIG. 2), the inner core 2 is sequentially broken along the spiral. The entire core 2 is extracted from the cold shrink tube 4, and the cold shrink tube 4 tightly covers the wire connection portion.
[0004]
The inner core 3 in FIG. 3 is a simple plastic cylinder. The inner core 3 is simply pulled and removed from the cold shrink tube 4.
[0005]
[Problems to be solved by the invention]
Since each of the inner cores 1, 2, and 3 is made of plastic, it becomes industrial waste after use. Considering environmental problems in recent years, those that do not become industrial waste are desired.
This invention is made | formed in view of the said situation, and it aims at providing the inner core for normal temperature shrinkable tubes which do not become industrial waste after use.
[0006]
[Means for Solving the Problems]
The present invention that solves the above problems is an inner core for a cold shrink tube that is used by fitting it into a cold shrink tube having a cylindrical shape,
The tape of paper made of a plant fiber and a sealed spirally wound, characterized in that by joining the adjacent tape edges to each other with an adhesive or pressure-sensitive adhesive is formed into a cylindrical shape.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG . FIGS. 1 to 3 show the inner cores 1, 2, and 3 for a cold-shrinkable tube that are cylindrically fitted and used in the cold-shrinkable tube. As described above, the outer shape is general. And (b) is a side view of the inner cores 1, 2, and 3, and (b) is a side view of the state in which the inner cores 1, 2, and 3 are fitted to the room temperature shrinkable tube 4.
[0010]
Referring to FIG. 1 as an embodiment of the present invention, the inner core 1 of FIG. 1 has a configuration in which a paper tape 5 made of vegetable fibers is hermetically wound and the adjacent tape edges are partially joined with an adhesive. is there. Reference numeral 6 denotes an adhesive portion in the present invention. Moreover, joining using an adhesive instead of an adhesive is also considered. In the illustrated example, the tape is bonded along the spiral at the edge of the tape. However, when an adhesive or an adhesive having a weak adhesive force is used, continuous bonding may be considered. The paper material to be used is not particularly limited as long as it is a vegetable fiber. The thickness of the paper is set so as to have an appropriate strength according to the inner core diameter, the shrinkage force of the target normal temperature shrinkable tube, and the like.
[0011]
The inner core 1 is fitted into the cold shrink tube 4 as shown in FIG. 1 (b) and held in an expanded state. After covering the wire connecting portion with the cold shrinkable tube 4 expanded in diameter by the inner core 1, when the terminal portion 5a of the tape 5 of the inner core 1 is pulled, the joint portion by the adhesive or the adhesive is sequentially broken from the left end side of the figure. Then, the tape 5 is unwound, and the entire inner core 1 is pulled out from the room temperature shrinkable tube 4, and the room temperature shrinkable tube 4 adheres and coats the wire connection portion.
[0012]
The inner core 2 in FIG. 2 is a reference example, and has a configuration in which a spiral groove 7 is formed on the outer peripheral surface (or inner peripheral surface) of a paper cylinder. The groove 7 is formed by rotating the acute angle protrusion or cutter spirally with respect to the stationary paper cylinder or by linearly moving the paper cylinder relative to the stationary acute protrusion or cutter while rotating the paper cylinder. The outer peripheral surface can be recessed by pressure, or the outer peripheral surface can be formed by cutting halfway through the paper thickness.
When the end of the spiral cut piece 8 that is torn along the groove 7 is pulled at the end face of the cylindrical body (the left end side in FIG. 2), the inner core 2 is sequentially broken along the spiral. The entire core 2 is extracted from the cold shrink tube 4, and the cold shrink tube 4 tightly covers the wire connection portion.
[0013]
In addition, instead of forming the groove 7 as in the inner core 2 in FIG. 2, it is also a reference example, but a spiral perforation 11 may be provided in the paper cylinder as in the inner core 10 in FIG. it can. In addition, the illustrated perforations 11 are perforations having a short interval, but may be perforations having a dotted connection portion with respect to a sufficiently long slit.
[0014]
The inner core 3 in FIG. 3 is also a reference example, but is simply a paper cylinder. The inner core 3 is simply pulled and removed from the cold shrink tube 4.
Although FIG. 3 shows a cylindrical body having a smooth outer peripheral surface, it may be a cylindrical body bent so that the cross section becomes a circular saw or a gear shape, like the inner core 12 of FIG. 5 which is also a reference example . In this case, the contact area with the inner peripheral surface of the cold-shrinkable tube is sufficiently small, and the friction at the time of extraction is reduced, so that the extraction workability is improved.
[0015]
【The invention's effect】
According to the present invention, an inner core for a cold shrinkable tube is formed into a cylindrical shape by sealing a paper tape made of vegetable fiber in a sealed spiral shape and joining adjacent tape edges with an adhesive or an adhesive. since it is configured Te, after use, it is possible to incinerated without discharging harmful substances, without the industrial waste, such as conventional plastic inner core, environmental problems preferred.
[Brief description of the drawings]
FIG. 1 is a view of an inner core for a cold shrinkable tube common to the present invention and a conventional example as an outer shape, (A) is a side view, and (B) is a fitting of the inner core to a cold shrinkable tube. It is a side view of a state.
FIGS. 2A and 2B are diagrams of an inner core for a cold shrinkable tube as a reference example of the present invention and a conventional example . FIG. 2A is a side view of the inner core, and FIG. 2B is a fitting of the inner core to the cold shrinkable tube. It is a side view of the state made to do.
FIGS. 3A and 3B are diagrams of an inner core for another room temperature shrinkable tube as a reference example of the present invention and a conventional example . FIG. 3A is a side view of the inner core, and FIG. It is a side view of the state made to fit.
4 shows another reference example of the inner core of FIG. 2, and is a side view of the inner core. FIG.
5 shows another reference example of the inner core of FIG. 3, and is a cross-sectional view of the inner core. FIG.
[Explanation of symbols]
1 Inner core 4 Cold shrink tube 5 Tape
5a Tape end 6 Adhesive (joint)

Claims (1)

An inner core for a cold-shrinkable tube that has a cylindrical shape and is fitted in a cold-shrinkable tube,
The tape of paper made of a plant fiber and a sealed spirally wound, adjacent the inner core for cold shrink tube, characterized in that the tape edges to each other and formed into a cylindrical shape by joining with an adhesive or pressure-sensitive adhesive.

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