JPH0713124Y2 - Laminating tape forming roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a roll for forming a laminated tape of a laminated sheath type cable into a cylindrical shape, and more specifically, to the outer peripheral surface of a traveling cable core and traveling in the same direction. The present invention relates to a roll for forming a laminated tape into a tubular shape, which is provided in the step of attaching the laminated tape in the longitudinal direction thereof.

[Conventional technology and its problems]

The laminated sheath type cable is formed by molding a laminated tape, in which aluminum foil and polyethylene film (PE) are bonded together, on the outer circumference of the cable core into a cylindrical shape with the PE layer on the outside, and heat-sealing the overlapped part. Then, an outer cover made of high-density polyethylene (HDPE) or the like is extrusion-molded immediately above the inner cover and the PE layer of the laminating tape,
It is formed by fusing with heat and pressure during extrusion molding of the jacket.

The process of attaching the laminating tape to the cable core is
First, as shown in FIG. 2 and FIG. 3, a laminating tape forming roll 1, a forming gutter 2, a forming die 3, a heating blower 4, and a holding roller 5 are sequentially provided in the running direction of the cable core a. There is. As shown in FIG. 1, the forming roll 1 is composed of a drum-shaped male roll 1a and a drum-shaped female roll 1b, which are orthogonal to the running direction, and both rolls 1a and 1b have an uneven curved peripheral surface 1a ', When the laminating tape b is fed into the 1b ', the laminating tape b is formed into a widthwise band shape by the pressure contact between the concave and convex curved peripheral surfaces 1a' and 1b ', and the laminating tape b runs on the forming gutter 2. The core a is formed into a tubular shape, and the laminating tape b is formed into a pressure contact with the cable core a by the molding die 3, and the laminating tape b is heated by the heating blower 4 to heat the overlapping portion, and the pressing roller is pressed. 5, it is pressure-welded and heat-sealed (seamed).

In this step, whether or not the laminate tape b is smoothly and surely attached to the cable core a in the cylindrical shape is greatly affected by the degree of molding by the molding roll 1. That is, the key is caught.

However, in the conventional forming roll 1, in FIG. 1, the curved surface curvatures R ₂ and R ₂ ′ on which both sides of the laminate tape b of the male roll 1 a contact each other and the inner curved surface curvature that is continuous to both side portions thereof. : R ₄ is the same or the latter is set smaller than the former. For this reason, as shown in FIG. 5, in the tubular state where the molding die 3 is ejected, the edge b'is likely to be lifted up, and when heat fusion is performed in this state, the edge b'is It is difficult to cause fusion, and defective fusion is likely to occur, leading to defective products.

In consideration of the above points, the present invention aims to eliminate the lifting of the edge b '.

[Means for Solving the Problems]

In order to solve the above problem, in the present invention, in the forming roll described above, tune peripheral surface curvature laminate tape both sides of the male roll contact: R _2, R ₂ ', the inner continuous to both sides thereof The curvature of the curved surface: R ₄ and the curvature of the laminated tape after forming the cylinder: R ₀ satisfy the following conditions.

Note R ₂ , R ₂ ′, ≦ R ₀ ≦ R ₄ , R ₄ ≠ R ₂ , R ₂ ′ The above R ₄ is preferably twice or more than R ₀ .

[Action]

When the laminate tape is formed by the forming roll configured as described above, first, both edge portions in the length direction of the laminate tape are formed with a curvature smaller than the finished outer diameter of the tubular shape,
Since it is molded into a tubular shape in this state, both edges that are the overlapping portions of the tape are exactly overlapped (see FIG. 4).

If R ₄ is more than twice as large as R ₀ , the laminating tape in contact with the curved surface of the roll of R ₄ has less forming action, that is, the degree of curvature is small, so that both sides of it, R ₂ and R ₂ ′ curved surface can be supported The surface is effectively shaped.

〔Example〕

In the shape of the conventionally known forming roll 1 shown in FIG. 1,
Three types (Nos. 1 to 3) whose respective dimensions are shown in Table 1 were manufactured. Incidentally, each concave and convex curved peripheral surface 1a 'of the male / female rolls 1a, 1b,
1b 'is finished And a baking material was used.

When the above-mentioned laminated tape b was molded by each of the examples, as shown in FIG. 4, it was possible to obtain a tubular shape in which the overlapping portions of the edges b ′ were exactly overlapped.

Further, conventionally, since the roll 1 was made of metal, there was a problem that a metal residue was generated by the contact with the laminating tape b and the residue was seized.
In addition to eliminating this problem, due to the lightness and elasticity of the material, the laminate tape b can be smoothly molded without an excessive force being applied.

In the example, R ₁ and R ₁ ′ and R ₂ and R ₂ ′ have the same dimensions, but if either one is slightly larger or smaller,
In the molding process, it is possible to surely avoid the contact between the both edges b ′ of the laminated tape b. The avoidance effect can also be obtained by slightly shifting the male roll 1a and the female roll 1b in the axial direction. Furthermore, R ₁ ,
R ₁ ′ may also be smaller than R ₀ .

[Effect of the Invention] Since the present invention is configured as described above, it is possible to obtain a tubular type in which the edges of the laminated tape are exactly overlapped. Therefore, during manufacturing of the laminated sheath type cable, the defective thermal fusion of the edge portion of the laminated tape does not occur, and the defective thermal fusion with the outer jacket hardly occurs. Therefore, product defects are unlikely to occur.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of a laminated tape forming roll according to the present invention, FIG. 2 is a front view of main steps for explaining a production process of a laminated sheath type cable, and FIG. 3 is the same. Top view, 4th
FIG. 5 is a sectional view of the laminated tape according to this embodiment after molding, and FIG. 5 is a sectional view of the conventional example after molding. 1 ... Forming roll, 1a ... Male roll, 1b ... Female roll,
1a ', 1b' ... uneven curved peripheral surface, a ... cable core, b ...
… Laminated tape.

Front page continuation (72) Inventor Akira Umegaki 2-3-1, Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (56) Reference JP-A-59-191214 (JP, A)

Claims (2)

[Scope of utility model registration request] 1. A drum-shaped male roll, which is provided in a step of attaching a laminating tape traveling in the same direction in a tubular shape in the length direction to the outer peripheral surface of the traveling cable core, and having an axis orthogonal to the traveling direction. drum-shaped consists of a female roll, in laminating tape casting rolls uneven song circumferential surface of the rolls is pressed by interposing the laminate tape, songs peripheral surface curvature laminate tape both sides of the male roll contact: R ₂ , R ₂ ′, curvature of the inner curved peripheral surface continuous to both sides thereof: R ₄ , and curvature of the laminated tape after tubular molding: R ₀ satisfy the following conditions: roll. R ₂ , R ₂ ′, ≦ R ₀ ≦ R ₄ , R ₄ ≠ R ₂ , R ₂ ′ 2. The laminate tape forming roll according to claim 1, wherein R ₄ is set to be twice as large as R ₀ or more.