JPH07214663A - Method and apparatus for manufacturing heat-insulating tubular body with skin - Google Patents

Abstract

(57) [Summary] [Object] To provide a manufacturing apparatus and a manufacturing method of a heat insulating tubular body with a skin that does not cause a defective appearance and can improve productivity. [Structure] Conveying means for conveying the skin sheet body 2 and the heat insulating tubular body 1 made of foamed resin, and bending forming means for bending the skin sheet body 2 so that the skin sheet body 2 covers the heat insulating tubular body 1. The curved molding means comprises a molding die 5 whose surface is gradually curved from the upstream side to the downstream side from a flat shape to the shape of the heat insulating tubular body 1 in an arc shape, and constitutes a conveying means. An apparatus and a method for manufacturing a heat-insulating tubular body with a skin, in which 6 passes through the molding die 5 in the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat-insulating tubular body with a skin covering the outer peripheral portion of a heat-insulated pipe such as a copper pipe constituting a heating medium feeding pipe for air conditioning, and the production thereof. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, in the case of manufacturing a heat insulating tubular body of this type, in order to increase the manufacturing efficiency, a heat insulating sheet body made of a foamed resin having a predetermined thickness is heated to be curved and formed into a cylindrical shape, and when it is bent, it is projected. A means such as fusing both ends of the combined sheet in the width direction is used.

Further, in the above means, since the tube thickness of the heat insulating tubular body is determined by the thickness of the heat insulating sheet body, when the tube thickness is insufficient, the formed heat insulating tubular body is set to the inner side and further to the outside by a predetermined thickness. The heat insulating sheet bodies are laminated.

Then, a skin sheet is attached to the heat insulating tubular body formed as described above from the viewpoint of water resistance and appearance of the outer surface, cut into appropriate lengths, and then cut into the heat insulating tubular body. A heat-insulated tube such as a copper tube having a predetermined length is inserted into the tube opening of the.

However, in the conventional means as described above, the bending step, the heat insulation tube inserting step, the skin sheet attaching step and the like are performed independently of each other, and there is a limit to the improvement in productivity. For this reason, the present applicant has previously extended the insulating heat-insulating tubular body made of foamed resin in the pipe length direction, while lengthening the heat-insulating sheet body with the skin sheet made of foamed resin in which the skin sheet is pasted on one sheet surface. So as to face the other sheet surface of the heat insulating tubular body by forming a large number of through holes penetrating in the thickness direction in either the heat insulating tubular body or the heat insulating sheet body. The heat insulating sheet body is heated by blowing hot air, and the heat insulating sheet body is curved so that the heat insulating tubular body covers the heat insulating tubular body and both ends of the heat insulating sheet body in the sheet width direction abut against each other. At least one of both ends is heated to fuse the both ends, the laminated heat-insulating tubular body obtained by the fusion is cut into a predetermined tube length, and then the heat-insulated tube is placed in the laminated heat-insulating tubular body having the predetermined tube length. Through The manufacturing method and manufacturing apparatus of the surface sheet with coating insulated pipe to improve the productivity of the skin sheet with coating insulated pipe, and patent application (Japanese Patent Application No. 4-1
21982).

[0006]

However, in the above-described manufacturing method and apparatus, the heat insulating sheet is so arranged that the heat insulating sheet body covers the heat insulating tubular body and that both ends of the heat insulating sheet body in the sheet width direction abut each other. As the bending forming means for bending the body, as shown in FIG. 5, a trumpet tubular forming die 41 having an opening whose diameter is gradually reduced from the upstream side to the downstream side has been used. In such a trumpet tubular molding die 41, since the inlet portion 42 of the molding die 41 is formed in an arc shape, the heat insulating sheet body is rolled into an arc shape and enters the molding die 41. , For this reason, FIG.
As shown in (a) and FIG. 6 (b), vertical wrinkles 52, bottom wrinkles 53, etc. are likely to occur on the surface of the obtained coated sheet heat retaining tube 51 with a skin sheet, resulting in poor appearance and impeding productivity. There was an occasion.

The present invention according to claim 1 has been made in view of the above problems, and an object thereof is to provide a method for producing a heat insulating tubular body with a skin, which does not cause a defective appearance and can improve productivity. And

It is an object of the present invention to provide an apparatus for manufacturing a heat insulating tubular body with a skin, which can improve productivity without causing a defective appearance.

According to the third aspect of the present invention, a heat insulating tubular body with a skin can better prevent the appearance defect from occurring when a fin or the like is provided at an end portion of the skin sheet in the sheet width direction. It is an object of the present invention to provide a manufacturing apparatus of.

[0010]

According to a first aspect of the present invention, there is provided a method for manufacturing a heat insulating tubular body with a skin, wherein the skin sheet body is a heat insulating tubular body while the skin sheet body and the foamed resin heat insulating tubular body are conveyed. So that the skin sheet body is gradually curved from a planar shape to the shape of a heat insulating tubular body, and the heat insulating tubular body is covered with the skin sheet body.

According to a second aspect of the present invention, there is provided an apparatus for producing a heat insulating tubular body with a skin, wherein a transporting means for transporting the skin sheet body and the foaming resin heat insulating tubular body, and the skin sheet body covering the heat insulating tubular body. And a curve forming means for bending the skin sheet body, wherein the curve forming means is a molding die whose surface is gradually curved in an arc shape from a flat surface toward a downstream side in a shape of a heat insulating tubular body. In addition, the forming belt constituting the conveying means is configured to pass on the forming die in the longitudinal direction.

According to a third aspect of the present invention, there is provided an apparatus for producing a heat insulating tubular body with a skin according to the second aspect of the apparatus for producing a heat insulating tubular body with a skin, wherein the end of the skin sheet body in the sheet width direction is located at a midpoint of the curve forming means. It is characterized in that a pressing roll for pressing the portion is provided.

In the method for producing the heat insulating tubular body with the skin according to the first aspect of the present invention and the apparatus for producing the heat insulating tubular body with the skin according to the second and third aspects, one sheet is used as the skin sheet body. Examples thereof include a skin sheet having an adhesive applied to its surface, and a foamed resin-made heat insulating sheet having a skin sheet attached to one sheet surface.

[0014]

Since the method for producing a heat insulating tubular body with a skin according to the first aspect of the present invention is configured as described above, the skin sheet body covered with the heat insulating tubular body is changed from a flat state by the curve forming means. The heat insulating tubular body is gradually curved into the shape of the heat insulating tubular body and is sequentially coated on the heat insulating tubular body. As a result, wrinkles do not enter the skin sheet body, vertical wrinkles, bottom wrinkles, etc. of the heat-insulating tubular body with skin are prevented, appearance defects are eliminated, and productivity is improved.

In the apparatus for manufacturing a heat insulating tubular body with a skin according to a second aspect of the present invention, the curve forming means is such that the surface gradually curves from an upstream side to a downstream side into a shape of a heat insulating tubular body in an arc shape. Since the molding belt of the conveying means is configured to pass through the molding die in the longitudinal direction, the heat insulating tubular body and the skin sheet body are conveyed while the skin sheet body is flattened. The shape can be gradually curved from the shape to the shape of a heat insulating tubular body, and appearance defects such as wrinkles can be eliminated.

In the apparatus for manufacturing a heat insulating tubular body with a skin according to a third aspect of the present invention, since the press roll for pressing the end portion of the skin sheet body in the sheet width direction is provided in the middle of the curve forming means, the skin sheet. When a fin or the like is provided at the end of the body, for example, in the heat insulating sheet with a skin made of a foamed resin in which the skin sheet is pasted on one of the sheet surfaces, the sheet width of the skin sheet is set to the heat insulating sheet body. Compared to the case where a wider part is formed and an unattached part protruding by this wide part, a so-called fin-shaped part is provided, the fin part is pressed by the pressing roll,
No wrinkles on the fins.

[0017]

EXAMPLE A method and apparatus for manufacturing a heat insulating tubular body with skin according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view showing an example of an apparatus for manufacturing a heat insulating tubular body with a skin of the present invention. In FIG. 1, 1 is a heat insulating tubular body made of expanded polyethylene resin, 2 is a skin sheet body made of PVC tape,
3 is a heat insulating tubular body with a skin, 4 is a guide type of the heat insulating tubular body 1,
Reference numeral 5 is a molding die that is a bending molding unit that curves the skin sheet body 2 so that the skin sheet body 2 covers the heat insulating tubular body 1.
Is a forming belt which constitutes a conveying means. The skin sheet body 2 may be a heat insulating sheet with a skin made of foamed resin, in which the skin sheet is attached to one sheet surface. In this case, a heating device such as hot air heating is used to abut and fuse the ends of the heat insulating sheet.

Reference numeral 7 is a feed belt for transporting the heat insulating tubular body 1 and the skin sheet body 2, and 8 is a release paper separated from the PVC tape of the skin sheet body 2.

FIG. 2 is a schematic perspective view of the molding die shown in FIG. In FIG. 2, reference numeral 11 denotes an upstream end portion of the molding die 5, the surface of which is formed in a flat shape. Reference numeral 12 denotes the downstream end of the molding die 5, and the surface between the upstream end 11 and the downstream end 12 faces from the upstream side to the downstream side from a flat surface to a heat insulating tubular shape. The body 1 is gradually curved in an arc shape. It is also possible to provide a large number of suction holes on the surface of the molding die 5 that contacts the molding belt 6 to form a vacuum molding die, and to form a large number of suction holes on the molding belt 6 to form a vacuum molding belt. In this way, the skin sheet body 2 is adsorbed by the vacuum forming belt, so that wrinkles are less likely to occur.

FIG. 3 is a sectional view taken along the line YY of FIG. In FIG. 3, reference numeral 15 is a pressing roll that presses the end portion of the skin sheet body 2 in the sheet width direction and is provided in the middle of the molding die 5. There is no particular problem even if the pressing roll 15 is not provided, but it is particularly useful for preventing wrinkles when a fin portion or the like is provided at the end. Since the molding belt 6 passes over the molding die 5 in the longitudinal direction, the skin sheet body 2 conveyed on the molding belt 6 is sequentially transferred to the heat insulating tubular body 1 according to the curve of the molding die 5. To be covered.

FIG. 4 is an explanatory view showing the covering process of the skin sheet body, and FIG. 4 (a) shows the initial state of covering, FIG.
(B), FIG. 4 (c), and FIG. 4 (d) are explanatory views showing the progress in the middle. The skin sheet body 2 initially contacts the heat insulating tubular body 1 in a flat state, and is gradually curved and covered in the shape of the heat insulating tubular body 1 as the skin sheet body 2 advances.

Next, the method of the present invention will be described with reference to FIGS. The heat insulating tubular body 1 is fed by a feeding means (not shown) and guided by the guide die 4, while another feeding means is used so that the adhesive application surface faces the heat insulating tubular body 1.
And the heat insulating tubular body 1 and the skin sheet body 2 are conveyed onto the molding belt 6. Since the molding belt 6 is designed to pass over the molding die 5, it is curved along the surface shape of the molding die 5. As a result, the skin sheet body 2 is curved along the surface shape of the molding die 5 while being conveyed by the molding belt 6, and is sequentially covered with the heat insulating tubular body 1. At this time, the skin sheet body 2 is gradually covered with the heat-insulating tubular body 1 from the flat state, so that the skin sheet body 2 is not wrinkled.

[0023]

EFFECTS OF THE INVENTION Since the method for producing a heat-insulating tubular body with a skin according to the first aspect of the present invention is configured as described above, a wrinkle does not enter the skin sheet body, and a vertical wrinkle of the heat-insulating tubular body with a skin,
It is possible to prevent bottom wrinkles and the like, eliminate defective appearance, and improve productivity.

In the apparatus for producing a heat insulating tubular body with a skin according to a second aspect of the present invention, while the heat insulating tubular body and the skin sheet body are conveyed, the skin sheet body is gradually changed from a flat shape to a heat insulating tubular body in an arc shape. Since it can be curved to the right, it is possible to eliminate appearance defects such as wrinkles.

In the apparatus for manufacturing a heat insulating tubular body with a skin according to the third aspect of the present invention, when a fin or the like is provided at the end of the skin sheet body, the fin can be pressed by a pressing roll. It is possible to prevent wrinkles and the like from occurring.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of an apparatus for producing a heat insulating tubular body with a skin of the present invention.

FIG. 2 is a schematic perspective view of the molding die shown in FIG.

FIG. 3 is a cross-sectional view taken along the line YY of FIG.

FIG. 4 is an explanatory view showing an example of a covering process of a skin sheet body.

FIG. 5 is a perspective view showing a molding die of a conventional apparatus for manufacturing a heat insulating tubular body with a skin.

FIG. 6 is a perspective view showing a defective state of a conventional heat insulating tubular body with a skin.

[Explanation of symbols]

 1 Heat Insulation Tubular Body 2 Skin Sheet Body 3 Heat Insulation Tubular Body with Skin 4 Guide Mold 5 Mold (Curve Molding Means) 6 Molding Belt (Conveying Means) 7 Feeding Belt (Conveying Means) 8 Release Paper 11, 12 Ends 15 Presser roll

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Claims (3)

[Claims] 1. The skin sheet body is gradually curved from a planar shape to the shape of a heat insulating tubular body so that the skin sheet body covers the heat insulating tubular body while conveying the skin sheet body and the heat insulating tubular body made of foamed resin. A method for producing a heat insulating tubular body with a skin, which comprises coating the heat insulating tubular body with a skin sheet body. 2. A transporting means for transporting the skin sheet body and the heat insulating tubular body made of foamed resin, and a curve forming means for bending the skin sheet body so that the skin sheet body covers the heat insulating tubular body, The curve forming means comprises a forming die whose surface is gradually curved from a flat surface to a heat insulating tubular body in an arc shape from the upstream side to the downstream side, and the forming belt constituting the conveying means is formed on the forming die. An apparatus for manufacturing a heat-insulating tubular body with a skin, characterized in that it is configured to pass through in the longitudinal direction. 3. The apparatus for producing a heat-insulated tubular body with a skin according to claim 2, wherein a press roll for pressing the end of the skin sheet in the sheet width direction is provided in the middle of the curve forming means.