JPS5979728A - Preparation of heat shrinkable sheet - Google Patents

Abstract

PURPOSE:To stabilize heat-shrinkable properties and to enhance production efficiency, by fusion bonding a heat shrinkable layer constituting material and a fusion bonded layer constituting material while sending a high temp. heating medium into a pipe in such a state that a pair of ribs are pressed to the surface of the pipe. CONSTITUTION:After a fusion bonding layer constituting material 13 is wound around a pipe 10 in a necessary thickness, the circumferences of ribs 6 are pressed to mutually closely adhere a plate like protruded part 11, the fusion bonded layer constituting material 13 and a heat shrinkable layer constituting material 14. Subsequently, a high temp. heating medium is sent into the fluid passage 12 of the pipe to fusion bond the fusion bonded layer constituting material 13 while heating the same to a fusion bonding temp. In the next step, a low temp. heating medium is passed through the fluid passage 12 of the pipe 10 to cool both constituting materials 13, 14 through the pipe 10 to solidify the fusion bonded part and, upon the detachement from the pipe 10, a heat shrinkable sheet 3 having a fusion bonded layer 3a and a heat shrinkable layer 3b and having a specific configuration in the vicinity of a pair of the ribs 6 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing heat-shrinkable fL sheets 1 to 1 used for covering connection parts of communication couples, etc.
There is. .

In general, cover connections such as communication couples. When sealing the communication cable 4, as shown in Figure 1, the communication cable 1. ′
A heat-shrinkable sheet 3 in the form of a longitudinally split sleeve is wrapped around the connecting portion 2 (=JG) to avoid heat shrinkage.

As shown in FIG. 2, the heat-shrinkable sheet 3 is composed of a heat-shrinkable layer 3a that can be heat-shrinkable in the circumferential direction, a heat-sealing layer 3b laminated inside the heat-shrinkable layer 3a, and the like. The heat-shrinkable layer 3a is made by, for example, uniaxially stretching a cross-linked polyurethane sheet, etc., so as to prevent heat shrinkage in the circumferential direction when formed into a sleeve shape. The thermal adhesive layer 3b is made of a material that has good thermal adhesive properties, such as uncrosslinked poly-1-dylene.

Further, the heat-shrinkable sheet 1-3 is wound around the connecting portion 2 with the inner surfaces of both side edges 3C, that is, the surface of the heat-sealing layer 3b facing each other and abutting each other, and The outer surface of 3G, 1 along the side edge of the surface of the straw heat-shrinkable layer 3a (vertical pressing rod) ~'4.4 is heat-shrinked while being held with a clamping tool such as a clip 5.5. A pair of protrusions 6, 6 for preventing loosening 11- are attached to the side edge 3C.

Conventional techniques i and j for manufacturing such heat-shrinkable 11 sheets 3
+More specifically, for example, the cross-linked poly blend 1~ and the uncrosslinked poly I blend 1- are bonded together, and then d3
(,/[There are six ways to apply tension in the right direction, stretch r -ffqll K, and make the chestnut (n poly I brency I- heat-shrinkable. If there is C, the second layer 4 will be stretched, so J', I Samura, contact 6 unevenness 41, etc. of uncrosslinked polyurethane resin 1.
Cross-linked polyurethane resin 1~ is likely to have partial stretching unevenness, and misalignment during stretching tends to cause a peeling phenomenon between both layers. In addition, there are some points in which the shape of the heat-shrinkable sheet is limited to a rectangle or the like that is drawn during the stretching process.

On the other hand, the uncrosslinked polyamide-1 was bonded to the pre-stretched cross-linked stretched polyurethane-1, which had been drawn in advance.
However, in the case of polyethylene, it is difficult to apply the adhesive, and the adhesive is heated at the opening 1. Due to the i effect, the J-method stability f'L deteriorates, which leads to a problem in which workability decreases.

This was done taking into consideration the above-mentioned circumstances, and proposed the IJ method for manufacturing heat-shrinkable sheets, which improves the susceptibility of the shape, stabilizes the heat-shrink performance, and improves manufacturing efficiency. Eye 1]
'J and J are things.

To explain the strategy of this defense, it is shown in Figure 3. The sea 1 has a protrusion 6 of −λ・j around the vibrator 10 as shown in FIG.
- Wrap the H4 structure (=JIJ, with the protrusion 6 pressed down) (・Avoid shrinking by heating (from this, perform heat fusion between the ribs to integrate, cool LllI, -<distortion of each layer) By removing the stress, a heat-shrinkable sheath corresponding to the outer diameter of the vibrator 1o can be formed.

Hereinafter, one embodiment will be described as shown in FIG.
11 I will explain C. The vibrator 10 used for manufacturing the heat-shrinkable sheets i to 3 is provided with a plate-shaped protrusion 11 that protrudes 21' radially outward/j along its length, and this plate-shaped protrusion The inside of 11 contains a fluid passage 12 along with a so-called pipe hole.

A heat-adhesive layer (for example, uncrosslinked polycordylene 1 to 1 with heat-adhesive properties) 13 is wrapped around such a vibrator 10 to the required thickness (as shown in FIG. 3 (Δ)). ()ru.

Part 1 (-A pair of protrusions 0.6 or 0.6 are integrally placed on both side edges (
; J ml In the direction perpendicular to the length direction (S /, ; : t J et al. 6 of the protrusion 6), the contraction Fi IM configuration) J (For example, if the stretched poly soil is
Place the outside of the bucket.
Vertical 't' as shown in the real IC from line 11'1 of 3)! l
\Eriru J, roll the sea urchin.

Next, press fJ iIi of C1 protrusion 6 and C plate-shaped protrusion 1
'), Part 1 'i It'! ? At the same time as the heat-shrinkable layer constituent phase 14 is placed in close contact with the IZ7, the fused stone layer 1 is drawn from line (A) to (A) in Figure 3 (C). (G) Cut the opening (413) from approximately the center position of the plate-like protrusion 11, and also, as shown by the solid line from the glue line 1 in FIG. 3(C), 'ff tool 15.15 Avoid moving the ridges 1 and 1 (U engaged with 3, hot bonding layer constituent phase 1
3. Heat to 11 degrees and shrink. A part of the structure shrine 14 is fixed on both sides of the plate-shaped protrusion 11 (push).

In this way, the heat-sealing layer constituent material 136 is paralyzed and the heat-shrinkable layer IM is formed.
Ai 4 is wrapped (= JU wrapped in the fluid passage 12 of the vibrator 10 in this state) Goods! ! ! Heat the heat 811 layer structure structure 13 to 1 temperature for hot melting by feeding 1 medium (e.g., heating steam) at a rate of 1/v.

Heat! (14) When the molten moon 13 is in the hot melt FJ!1 state, the outer heat-shrinkable layer 14 is also heated. Correct any loose parts such as those that are sagging, and push the surface of the vibrator 100 through the molten heat shield component 13. Shrine 13.
1/l is in a state of being shielded from the phase H, and since the heat shrinkage is hindered by the rigidity of the vibrator 10, uniform heat is generated. ．．
14 - I will be made into a tree.

Next, C, pass a low-temperature heat medium (for example, cold 7JI water) through the fluid passage 12 of the vibrator 10, and apply a cold IJ1 to both component parts 13 and 14 through the vibrator 10 to solidify the heat-fused portion. As shown in Figure 3 (0), the heat 1
It has an adhesive layer 3a and a heat-shrinkable layer 3b, and the pair of protrusions 6 are closed close to each other. Heat-shrinkable sheet]・
3 is completed.

', t iJ3, in these embodiments, the plate-shaped protrusion 1
I used a vibrator 10 that had been installed (), but I used a medium-pure round pipe and pressed the protrusion 6.6 to heat and cool Jl. It is possible to listen to 13.

However, according to the present invention, the heat-shrinkable sheet 1-
A made, 0) Vibrator made of heat-shrinkable sheet 1
Since the rice harvesting methods of ~ are in a constant relationship, the acceptability of the \1 method can be increased.

■By changing the outer diameter and shape of the pipe, heat shrinkage I1
Since the width and shape of each sheet can be set, the applicability of multi-product production can be increased.

■The SJ method is stable because it uses the outside diameter of the pipe, making it easy to use.
n effect ゛゛1. I can do hmer or c.

(Since heating is applied from within the pipe, uneven heating is less likely to occur, and the quality of the finished product is stabilized because it utilizes radially inward pressing force and heat fusion due to the contraction effect. I can do it.

It has the same 11 effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an example of a sealed structure of a connection part of a communication cable, Fig. 2 is a front view showing an example of heat-shrinkable seams 1 to 3;
Figures (△) to 1) are explanatory diagrams showing one embodiment of the thread manufacturing process. 1...Communication cable, 2...Connection part,
3... Heat 11 condensation - 1-13a...
Heat shrink layer, 3b... Heat shrinkage L3C...
・Edge, 10...Pipe, 11...(
Anti-one person protrusion, 12...Fluid passage, 13...
... 1 Heat fusion layer tM formation, 14 ... Heat absorption layer composition month, 15 ... Pressing jig. Applicant: Mutsukura Electric Wire Co., Ltd.

Claims (1)

[Claims] Wrapping a heat-adhesive layer structure around a pipe [No.-1
A heat-shrinkable layer structure having a pair of protrusions extending along the length of the pipe on the outer surface and extending in the circumferential direction of the pipe is wrapped around the pipe 1, and the pair of protrusions are attached to the surface of the pie 1. The material constituting the heat-shrinkable layer and the phase constituting the heat-sealing layer are heated and fused together by feeding a cooling medium into the compressed state (C, convex inside the pipe), and the pipe is cooled (characterized by the fact that they are integrated). A method of manufacturing a heat-shrinkable sheet.