JPH06143527A - Method and apparatus for manufacturing tubular coating material - Google Patents

Abstract

PURPOSE:To provide a method and an apparatus for manufacturing a tubular coating material which can continuously manufacture without damage at a fin part and without disturbing a thermal fusion-bonding of end faces of foamed sheet with a high productivity. CONSTITUTION:One side edge of a laminated sheet 1 is matched to a vertical roller 21, a fin part 15 of the other side edge is bent to a skin sheet 12 side, passed between rear horizontal rollers 3 and 3 while bringing a surface of a peeling sheet 14 into contact with an oblique roller 22 to fold the part 15 to the sheet 12 side. The sheet 1 is sent to a primary molding guide 41 as remained in this state, and deformed to a tubular state. When both ends faces of the sheet 11 are butted, it is melted through a heat-sealing cutter 46, passed, a melted part is pressed by next secondary molding guide 42 to be thermally fusion-bonded to form a tubular unit 1a. The unit 1a passed through the guide 42 is fed while being taken OFF in a nipped state between molding belts 51 and 52 to form a tubular coating material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tubular covering material with a skin sheet, which is used as a heat retaining member for coating an outer peripheral portion of a heat-insulated pipe such as a heat medium feeding pipe for air conditioning. The present invention relates to the manufacturing apparatus.

[0002]

2. Description of the Related Art A tubular covering material of this type has a release paper 14 at one end of a skin sheet 12 attached to the outer peripheral surface of a tubular body having slits 17 formed in the pipe length direction as shown in FIG. Since the fin portion 15 is formed and the pipe diameter of the tubular body can be freely expanded and contracted, if the pipe diameter of the pipe to be insulated is within a predetermined range, the pipes to be insulated of various sizes can be easily inserted. Moreover, if the release paper is peeled off and attached so as to cover the slit portion, the tubular body can be easily integrated.

Conventionally, in the production of this kind of tubular covering material, a long synthetic resin foam sheet and a skin sheet having a width larger than the width of the foam sheet and having an adhesive applied on one side thereof are used. Is laminated so that one end edge of each is aligned, and a release paper is laminated on the adhesive layer surface of the skin sheet exposed from the other end edge of the foamed sheet to form a fin portion. The laminated sheet is introduced into a molding guide, both end faces of the foamed sheet are butted and joined by heat fusion with a heat seal blade, and then opened by forming a slit portion in the pipe length direction at or near the heat fusion portion. It was manufactured as something that could be split. This fin portion is for finishing the coating by coating the tube for keeping the coated tube body warm, and then sticking it on the skin sheet excluding the release paper.

As shown in FIG. 5, the molding guide has a trumpet-shaped shape as a whole, and spreads in a hem-splitting manner from the middle part toward the upstream end, that is, the direction in which the laminated sheet 1 is fed. And a guide hole portion 44 having a circular cross section from the middle portion to the downstream end portion, that is, the end portion in the direction in which the tubular body 1a made of the laminated sheet 1 is discharged. A slit 45 is formed in the longitudinal direction substantially at the center of the upper surface of the above, and a seal blade 46 is inserted into the slit 45 and abutted against the end portion of the laminated sheet 1 by heat conduction so as to be heat-sealed. The end face of the foam sheet 11 is heat-sealed while the tubular body 1a is transferred with the fin portion 15 out from the slit 45.

[0005]

According to the conventional manufacturing method and apparatus described above, the fin portion 15 provided on one side edge of the foamed sheet 11 is a soft synthetic resin sheet, and therefore, the fin portion 15 is introduced into the molding guide 40. As the foamed sheet 11 and the skin sheet 12 are curved, the foamed sheet 11 is bent by its own weight toward the end surface of the foamed sheet 11, and the foamed sheet 11 is rolled up when it is heat-sealed, or even if it is not rolled up, the fins 15 seal the sealing blade 46.
There were a lot of accidents where it touched and melted.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, does not damage the fins, and does not hinder the heat fusion of the end surface of the foamed sheet, and is continuous and highly productive. An object of the present invention is to provide a method and an apparatus for manufacturing a tubular covering material that can be manufactured.

In the method for producing a tubular covering material of the present invention, a long synthetic resin foam sheet and a skin sheet having a width larger than the width of the foam sheet and having one side coated with an adhesive are respectively provided. One side edge of the foamed sheet is laminated and the release sheet is laminated on the adhesive surface of the skin sheet exposed from the other side edge of the foamed sheet to form a fin portion, and the fin portion of the laminated sheet is folded back to the skin sheet side. , The outer sheet is curved so that it is on the outside, and both end faces of the foam sheet are butted against each other and heat-sealed,
It is characterized in that it is formed into a tubular shape, and after cooling, a slit portion is formed in the tubular body in the vicinity of the fin portion.

Further, the tubular coating material producing apparatus of the present invention includes a pair of rotatable guides, one of which is a vertical roller provided almost vertically and the other of which is an inclined roller which is inclined outward from the lower end to the upper end. It comprises a roller, two upper and lower horizontal rollers provided behind the guide roller, a forming guide provided behind the horizontal roller, and a forming belt provided subsequently to the forming guide.

The details of the manufacturing method of the present invention will be described below.
Examples of the foamed sheet used in the method of the present invention include foamable materials such as heat-fusible polyethylene, polypropylene and the like, a mixture thereof, and a mixture of other polyolefin resins.

The skin sheet laminated on the foamed sheet is typically a soft sheet of polyvinyl chloride or the like. Usually, a pressure-sensitive adhesive is applied to one surface of a skin sheet having a width larger than the width of the foam sheet, and the foam sheet and the skin sheet are bonded together with one side edge aligned,
The release paper is attached to the adhesive surface of the skin sheet left on the other side edge of the foam sheet to form the fin portion.

In the method of the present invention, first, the entire fin portion is folded back toward the skin sheet at the edge of the foam sheet. The purpose of this folding back is to bend the foam sheet so that the skin sheet is on the outside, and when the end surfaces of the foam sheet are butted against each other, the fins are folded into the butted surface, or the end surfaces of the foam sheet are heat-sealed together. This is to prevent the fin from sometimes touching the seal blade and melting.

Next, the laminated sheet in which the foamed sheet and the skin sheet are laminated is introduced into the molding guide while being curved in a circular or elliptical shape with the skin sheet facing outside. Then, both end faces of the foamed sheet are butted against each other, but in order to prevent the fin portion folded back to the other side from returning to the opposite side again, it is preferable that the butted portion is made to be an upper portion and sent to the molding guide.

Heat sealing can be performed by passing a heat seal blade between both end faces of the abutted foamed sheets and pressing both end faces. Then, it is formed into a tubular shape, and after cooling, a slit portion is formed in the tubular body in the vicinity of the fin portion.

[0014]

In the manufacturing method of the present invention, the fin portion formed on one edge of the foam sheet is folded back to the skin sheet side and curved so that the skin sheet is on the outside, so that there is a fin portion between both end surfaces of the foam sheet. The end face of the foamed sheet can be heat-sealed without being folded. Also, the fins do not melt by touching the heat seal blade. According to the manufacturing apparatus of the present invention, one side edge of the laminated sheet is positioned by the vertical roller to stabilize the traveling position of the laminated sheet. The fins are folded back toward the skin sheet by the inclined roller. The fins are securely folded by the horizontal roller. It is formed into a tubular shape by the forming guide with the skin sheet outside, and heat-sealed. The heat-bonded portion is cooled by the forming belt, and the product is taken off.

[0015]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an example of a laminated sheet 1 used in the present invention. A polyethylene crosslinked foamed sheet 11 having a thickness of 15 mm and a width of 470 mm and a polyvinyl chloride resin sheet having a thickness of 15 μm and a width of 500 mm are provided with a pressure sensitive adhesive 13 on one side. And a skin sheet 12 formed by coating the same with one side edge aligned, and a release paper 14 is laminated on the adhesive 13 surface of the skin sheet 12 exposed on the other side edge of the foam sheet 11 to form a fin. This is the part 15.

FIG. 2 is an explanatory view for explaining the manufacturing method and manufacturing apparatus of the present invention. First, the device will be described. Reference numeral 2 is a guide roller provided on both sides of the long laminated sheet 1, 3 and 3 are upper and lower horizontal rollers provided continuously behind the guide roller 2, and 40 is a horizontal roller. The forming guide 5 provided on the rear side is a forming belt provided subsequent to the forming guide.

FIG. 3 is a perspective view for explaining the guide roller 2 and its vicinity.
The details of the horizontal roller 3 will be described. Guide roller 2
Is a rotatable vertical roller 21 provided almost vertically to the laminated sheet 1, and a rotatable inclination provided on the opposite side of the laminated sheet 1 from the lower end to the upper end so as to incline toward the outside of the laminated sheet 1. And a roller 22. Although the inclination angle of the inclination roller 22 can be changed, it is about 25 ° with respect to the vertical line in this embodiment.

The vertical roller 21 and the inclined roller 22 are erected on support bases 25 and 25 via core rods 23 and 24, respectively, and a support rod 26 is slidably inserted into the support bases 25 and 25. Screw rods 27 fixed to the pedestals 28, 28 at both ends and provided with reverse screws from the center to both ends below the support rods 26 are screwed to the pedestals 25, 25, and further attached to the pedestals 28, 28. It has been inserted. By rotating the handle 29 at one end of the screw rod 27, the support base 2
The members 5 and 25 can be moved toward and away from each other along the support rod 26.

Following the guide roller 2, two upper and lower rotatable horizontal rollers 3 and 3 are axially supported by a column (not shown) by a core rod, and the distance between the two horizontal rollers 3 and 3 is large. Is about 1 mm wider than the thickness of the laminated sheet 1.

In FIG. 2, behind the horizontal rollers 3 and 3, a forming guide 40 as a curve forming means, a seal blade 46 as a heat-sealing means, and a forming belt 5 as a take-off forming means are sequentially arranged. .

The molding guide 40 comprises a primary molding guide 41 and a secondary molding guide 42. Since the structure of the primary molding guide is the same as that of the molding guide described in the above-mentioned prior art, description thereof will be omitted. A guide hole 47 having a semicircular cross section is formed in the secondary molding guide 42 provided subsequent to the primary molding guide 41.
Is formed, and the radius of the guide hole 47 is reduced from the upstream side to the downstream side in the traveling direction of the laminated sheet, and the curved surface of the guide hole 47 is directed downward.

As shown in FIG. 2, the molding belt 5 comprises an upper molding belt 51 and a lower molding belt 52. The upper molding belt 51 is pulleys 53 and 53, and the lower molding belt 52 is pulleys 54 and 54. It is wound around. Forming grooves having a semicircular cross section are formed in the forming belts 51 and 52 so as to face each other, and guide holes having a substantially circular cross section are formed by both forming grooves.

Next, a method for producing a tubular covering material using the above apparatus will be described. As shown in FIG. 4, one side edge of the laminated sheet 1 described above is aligned with the vertical roller 21, and the fin portion 15 of the other side edge is bent toward the skin sheet 12 side to release paper 14.
When the surface is applied to the inclined roller 22 and is passed between the horizontal rollers 3 and 3 at the rear, the fin portion 15 is formed into the skin sheet 12
It is surely folded back to the side.

When the laminated sheet 1 is fed to the primary molding guide 41 as shown in FIG. 5 in this state, both ends of the laminated sheet 1 are lifted with the skin sheet 12 facing outward and gradually deformed into a tubular shape. Then, when both end surfaces of the foamed sheet 11 are butted, the heat seal blade 46 is sandwiched between them to be melted and passed, and the melted portion is pressed and heat-sealed by the next secondary molding guide 42 to form the tubular body 1a. . Even when the fins 15 are melted and heat-sealed, the fins 15 are folded back to the skin sheet 12 side, so the fins 15 fold into the abutting surface of the foam sheet 11 or touch the heat seal blade 46. Never.

However, in the case of a primary molding guide whose cross section is symmetrical, since there is a fin portion 15 at one side edge of the foam sheets 11 to be abutted, a step is formed between two abutting end faces, but compared to this step. Since the thickness of the foamed sheet 11 is quite large, there is no practical problem.

The tubular body passing through the secondary forming guide 42 passes between the forming belts 51 and 52, and at this time, the tubular body travels while being drawn under a pressure between the forming holes formed by both belts. To form the tubular body 1a shown in FIG.
The roundness is also highly accurate.

The take-up speed of the forming belts 51 and 52 is preferably higher than the speed of passing through the guide roller 2, and is about 10% higher in the above embodiment. Due to this acceleration, the material is tensioned until it is molded, and a straight product can be obtained without wrinkling or bending of the product.

After the fusion-bonded portion of the tubular body 1a manufactured in this manner is cooled, the fusion-bonded portion 16 or its vicinity is cut off along the pipe length direction to form the slit portion 17. Although the release paper 14 is attached to the fin 15 when the tubular body 1a is molded, the slit 17 is opened to insert the heat-retaining tube and the release paper 14 is peeled off when the tubular body 1a is used.
By attaching the, the tube to be insulated can be easily fixed.

[0029]

According to the manufacturing method of the present invention, the fin portion formed at one edge of the foamed sheet is folded back to the skin sheet side,
Since the outer skin sheet is curved so as to be on the outer side, the fin portion is not folded between the both end surfaces of the foamed sheet, so that heat fusion is not hindered. Further, the fin portion does not touch the heat-sealing blade and melt, so that a high-quality tubular covering material can be continuously produced. According to the manufacturing apparatus of the present invention,
The vertical roller positions one side edge of the laminated sheet to stabilize the traveling position of the laminated sheet. The fins are folded back to the skin sheet side by the inclined rollers, and the fins are surely folded by the horizontal rollers. As a result, the fins are folded between both end faces of the foamed sheet to prevent heat fusion, and the fins do not melt by touching the heat seal blade. Moreover, the outer peripheral sheet is formed into a tubular shape by the forming guide and heat-sealed, and the heat-sealed portion is cooled by the forming belt, and the product is taken off. Can be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a laminated sheet used in the present invention.

FIG. 2 is an explanatory diagram for explaining an embodiment of the manufacturing method and the manufacturing apparatus of the present invention.

FIG. 3 is a perspective view showing details of the vicinity of the guide roller of FIG.

FIG. 4 is a partial cross-sectional view of a guide roller portion showing a part of the embodiment of the method of the present invention.

FIG. 5 is a plan view showing a configuration of a conventional manufacturing apparatus.

FIG. 6 is an end view of the tubular dressing.

[Explanation of symbols]

 1: Laminated sheet 1a: Tubular body 2: Guide roller 3: Horizontal roller 5: Forming belt 11: Foaming sheet 12: Skin sheet 13: Adhesive 14: Release paper 15: Fin 21: Vertical roller 22: Inclined roller 40: Molding guide

Claims (2)

[Claims] 1. A long synthetic resin foam sheet and a skin sheet having a width larger than the width of the foam sheet and having an adhesive applied on one surface thereof are laminated with one side edge thereof aligned. The fin portion of the laminated sheet formed by laminating release paper on the adhesive surface of the skin sheet exposed from the other side edge of the foamed sheet to form the fin portion is folded back to the skin sheet side so that the skin sheet is on the outside. A method for manufacturing a tubular covering material, which comprises bending and foaming a foamed sheet by abutting both end surfaces of the foamed sheet to form a tubular shape, cooling, and then forming a slit portion in the tubular body in the vicinity of the fin portion after cooling. 2. A pair of rotatable guide rollers, one of which is a vertical roller provided almost vertically, and the other of which is an inclined roller which is inclined outward from a lower end to an upper end,
An apparatus for producing a tubular covering material, comprising two upper and lower horizontal rollers provided behind the guide roller, a forming guide provided behind the horizontal roller, and a forming belt provided subsequently to the forming guide.