JPH07214664A - 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 capable of preventing appearance defects such as wrinkles and air inclusions. [Structure] Conveying means for conveying the skin sheet body 2 while adsorbing it by a vacuum forming belt 6 having a large number of suction holes, and bending the skin sheet body 2 so that the skin sheet body 2 covers the heat insulating tubular body 1. Bending forming means comprises a vacuum forming die 5 having a large number of suction holes on the contact surface of the vacuum forming belt 6, and the vacuum forming belt 6 is placed on the vacuum forming die 5. With a skin, characterized in that a groove or ridge is provided in the width direction of the vacuum forming belt 6 on the surface of the vacuum forming belt 6 that abuts on the skin sheet 2 in the longitudinal direction. Apparatus and method for manufacturing a heat insulating tubular body.

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 bent into a cylindrical shape, and when it is bent, the projection A method of fusing both ends of the combined sheet width direction is adopted.

Further, in such a method, since the tube thickness is determined by the thickness of the heat insulating sheet body, when the thickness is insufficient, the formed heat insulating tubular body is set as the inner side and the heat insulating sheet body having a predetermined thickness is further formed on the outer side. Are stacked.

The cylindrical tubular body molded as described above has a skin sheet attached from the viewpoint of water resistance and appearance of the outer surface, and then cut into a suitable length and cut into a heat insulating tubular body. A heat-insulated tube such as a copper tube having a predetermined length is inserted into the mouth of the body.

However, in such a conventional technique, the bending step, the heat-insulated 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 previously extended the insulating heat-insulating tubular body made of a foamed resin in the pipe length direction while lengthening a heat-insulating sheet body with a skin-made foam sheet having a skin sheet attached to one sheet surface. And a plurality of through holes penetrating in the thickness direction are formed in either one of the heat insulating tubular body or the heat insulating sheet body so that the heat insulating tubular body faces the other sheet surface of the heat insulating sheet body. So that the heat insulating sheet body is heated by blowing hot air so that the heat insulating sheet 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. Then, at least one of the butted opposite ends is heated to fuse the opposite ends, and the laminated heat insulating tubular body obtained by the fusion is cut into a predetermined pipe length, and thereafter, the laminated heat insulation having the predetermined pipe length. The tubular body By inserting a temperature pipe, a method of manufacturing the skin sheet laminated coating insulated pipe to improve the productivity and the production apparatus, has filed a patent application (Japanese Patent Application No. 4-1219
82).

[0006]

However, in the above means, the heat insulating sheet body is curved so that the heat insulating sheet body covers the heat insulating tubular body and both ends of the heat insulating sheet body in the sheet width direction abut each other. The curve forming means to
As shown in FIG. 8, a trumpet tubular molding die 41 having an opening whose diameter is gradually reduced from the upstream side to the downstream side has been used. Then, the appearance defects such as wrinkles that are easily caused by the wrapper tubular forming die 41 are used as the forming die 41, and the conveying forming belt passing on the forming die is provided with a large number of suction holes. Further, as a vacuum forming belt, a skin sheet member such as a heat insulating sheet member is adsorbed to improve the appearance. However, since the vacuum forming belt is a flat vacuum forming belt, the vacuum forming belt shown in FIGS.
As shown in Fig. 5, a coated heat insulation tube with a manufactured skin sheet 5
On the surface of No. 1, appearance defects such as wrinkles 52 and air 53 were likely to occur, which impeded productivity.

The method of the present invention as set forth in claim 1 has been made in view of the above problems, and it is possible to prevent appearance defects such as wrinkles and air inclusions, and to improve productivity. It aims at providing the manufacturing method of.

An object of the apparatus of the present invention is to provide an apparatus for producing a heat insulating tubular body with a skin capable of preventing appearance defects such as wrinkles and air entering.

An object of the apparatus of the present invention is to provide an apparatus for manufacturing a heat insulating tubular body with a skin that can more stably prevent the appearance defect.

[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 is provided with a large number of suction holes, and a concave groove is formed on a contact surface with the skin sheet. Or, while adsorbing to a vacuum forming belt provided with a convex shape and conveying it, the skin sheet body is gradually curved so that the skin sheet body covers the heat insulating tubular body made of foam resin that is being transferred synchronously, and the heat insulating tubular body is formed. It is characterized in that it covers 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, and a carrying means for carrying a skin sheet body while sucking the skin sheet body by a vacuum forming belt provided with a large number of suction holes.
The skin sheet body is provided with a bending molding means for bending the skin sheet body so as to cover the heat insulating tubular body made of foamed resin,
The bending forming means is composed of a vacuum forming die in which a large number of suction holes are provided on the contact surface of the vacuum forming belt, and the vacuum forming belt is configured to pass on the vacuum forming die in the longitudinal direction.
A concave groove or a convex strip is provided in the width direction of the vacuum forming belt on the surface of the vacuum forming belt that contacts the skin sheet body. An apparatus for producing a heat insulating tubular body with a skin according to a third aspect of the present invention is the apparatus for producing a heat insulating tubular body with a skin according to the second aspect of the present invention, wherein a groove is provided on the skin sheet body contact surface of the vacuum forming belt. Alternatively, the ridge is provided obliquely with respect to the traveling direction of the vacuum forming belt.

In the method for producing a heat insulating tubular body with a skin according to the first aspect of the present invention and the apparatus for producing a heat insulating tubular body with a 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.

In the apparatus for manufacturing a heat insulating tubular body with skin according to the second and third aspects of the present invention, the depth of the concave groove is 0.3 to 1.0 mm, the width is 1 to 5 mm, and the interval is 5 to 30.
It is desirable to set it to about mm. The height of the ridge is 0.5 to 1
mm, the width is 1 to 5 mm, and the interval is preferably 5 to 30 mm.

In the apparatus for producing a heat insulating tubular body with a skin according to the present invention as defined in claim 3, the groove or ridge provided on the surface of the vacuum forming belt that contacts the skin sheet member is 30 in the traveling direction of the vacuum forming belt. It is desirable to provide the inclination angle of 60 to 60 degrees because it is possible to better prevent appearance defects such as wrinkles and air inclusions.

[0015]

Since the method for producing a heat insulating tubular body with a skin according to the present invention as set forth in claim 1 is configured as described above, the skin is formed by the concave groove or the convex shape provided on the contact surface with the skin sheet body. The sheet body is smoothly stretched in the circumferential direction to cover the heat insulating tubular body with the skin sheet body. As a result, wrinkles or the like do not occur on the skin sheet body and the appearance 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 vacuum forming belt is configured to pass in the longitudinal direction on the vacuum forming die, and the skin sheet contacting surface of the vacuum forming belt. In the width direction of the vacuum forming belt,
Since the groove or ridge is provided, the skin sheet body is adsorbed to the vacuum forming belt and conveyed, and is curved along the vacuum forming die surface, and the skin sheet body is formed by the groove or ridge. It is smoothly stretched in the circumferential direction. As a result, wrinkles or the like do not occur on the skin sheet body, and the appearance is improved.

In the apparatus for producing a heat insulating tubular body with a skin according to a third aspect of the present invention, since the groove or ridge is provided obliquely with respect to the traveling direction of the vacuum forming belt, the skin sheet body is a skin. As the sheet progresses, it is smoothly stretched in the circumferential direction.

[0018]

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 curve forming means for bending the skin sheet body 2 so that the skin sheet body 2 covers the heat insulating tubular body 1, which is a vacuum forming die having a large number of suction holes on the contact surface of the vacuum forming belt 6. Reference numeral 6 denotes a vacuum forming belt which constitutes a conveying means, and the vacuum forming belt 6 passes over the vacuum forming die 5. 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 conveying 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 plan view of the vacuum forming belt shown in FIG. 1, and FIG. 3 is a perspective view thereof. 2 and 3,
Reference numeral 11 is a suction hole provided in the vacuum forming belt 6, 12 is a concave groove provided in the surface of the vacuum forming belt 6 that contacts the skin sheet body 2, and θ is a concave groove 12 in the traveling direction of the vacuum forming belt 6.
And the concave groove 12 is provided at an angle of inclination θ = 45 degrees, and the concave groove 12 has a depth of 0.5 mm and a width of 3 mm.
The gaps are formed at 20 mm, and the suction holes 11 are provided between the concave grooves 12 and the concave grooves 12.

FIG. 4 is a sectional view taken along the line YY of FIG. Since the vacuum forming belt 6 passes over the vacuum forming die 5 in the longitudinal direction, the skin sheet body 2 conveyed on the vacuum forming belt 6 is attracted to the vacuum forming belt 6 and is vacuum formed. The heat-insulating tubular body 1 which is sequentially transferred in synchronization according to the curve of 5 is covered.

FIG. 5 is an explanatory view showing an example of the covering process of the skin sheet body, and FIG. 5 (a), FIG. 5 (b) and FIG.
(C) is explanatory drawing which showed each progress. The skin sheet body 2 is gradually curved and covered with 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 vacuum forming belt 6. Since the vacuum forming belt 6 passes over the vacuum forming die 5, it is curved along the surface shape of the vacuum forming die 5. The skin sheet body 2 on the vacuum forming belt 6 is adsorbed to the vacuum forming belt 6 through the suction holes 11 and conveyed, and is sequentially coated on the heat insulating tubular body 1. At this time, since the concave groove 12 is provided on the surface of the vacuum forming belt 6 that contacts the skin sheet body 2, the skin sheet body 2
Is smoothly stretched in the circumferential direction. As a result, the heat-insulating tubular body with the skin is manufactured without the occurrence of wrinkles on the skin sheet body 2.

FIG. 6 is a plan view showing another example of the vacuum forming belt which can be used in the method and apparatus of the present invention, and FIG. 7 is a perspective view thereof. In FIG. 6 and FIG. 7, 15 is a vacuum forming belt, 16 is a suction hole provided in the vacuum forming belt 15, 17 is a ridge provided on the surface of the vacuum forming belt 15 that contacts the skin sheet body 2, and β is a suction line. It is an inclination angle of the ridge 17 with respect to the traveling direction of the molding belt 15, the ridge 17 is provided at an angle of inclination β = 45 degrees, and the ridge 17 has a height of 0.
5mm, width 3mm, spacing 20mm, suction hole 1
6 is provided between the ridges 17 and 17.

[0025]

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, so that the skin sheet body is smoothly stretched in the circumferential direction to cover the heat insulating tubular body. It is possible to improve the appearance by preventing wrinkles and the like of the skin sheet body.

In the apparatus for manufacturing a heat insulating tubular body with a skin according to a second aspect of the present invention, since a groove or a convex strip is provided on the surface of the vacuum forming belt that abuts the skin sheet, the groove or the convex is formed. By the strip, the skin sheet body can be smoothly stretched in the circumferential direction, and the appearance can be improved without causing wrinkles or the like on the skin sheet body.

In the apparatus for manufacturing a heat insulating tubular body with a skin according to a third aspect of the present invention, since the concave groove or the ridge is provided obliquely with respect to the traveling direction of the suction molding belt, the skin sheet body is covered with the skin. As the sheet body advances, it can be smoothly stretched in the circumferential direction, and wrinkles and the like can be better prevented.

[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.

2 is a plan view of the vacuum forming belt shown in FIG. 1. FIG.

FIG. 3 is a perspective view of the vacuum forming belt shown in FIG.

FIG. 4 is a cross-sectional view as seen from the direction of the YY line in FIG.

FIG. 5 is an explanatory view showing an example of a covering process of a skin sheet body.

FIG. 6 is a plan view showing another example of the vacuum forming belt.

7 is a perspective view of the vacuum forming belt shown in FIG.

FIG. 8 is a perspective view showing a molding die of a conventional apparatus for manufacturing a heat insulating tubular body with a skin.

FIG. 9 is a perspective view showing a defective state of a conventional heat insulating tubular body with a skin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-insulating tubular body 2 Skin sheet body 3 Heat-insulating tubular body with skin 4 Guide type 5 Vacuum forming die 6, 15 Vacuum forming belt (conveying means) 7 Feed belt 8 Release paper 11, 16 Suction hole 12 Recessed groove 17 Convex ridge θ Inclination angle of concave groove β Inclination angle of ridge

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Claims (3)

[Claims] 1. A skin sheet body while adsorbing and transporting the skin sheet body to a vacuum forming belt having a large number of suction holes and a groove or a convex shape provided on a contact surface with the skin sheet body. A method for producing a heat-insulating tubular body with a skin, wherein the skin sheet body is gradually curved so as to cover the heat-insulating tubular body made of foamed resin which is transferred in a synchronized manner, and the heat-insulating tubular body is covered with the skin sheet body. 2. Conveying means for conveying the skin sheet body while adsorbing it on a vacuum forming belt provided with a large number of suction holes,
The skin sheet body is provided with a bending molding means for bending the skin sheet body so as to cover the heat insulating tubular body made of foamed resin,
The bending forming means is composed of a vacuum forming die in which a large number of suction holes are provided on the contact surface of the vacuum forming belt, and the vacuum forming belt is configured to pass on the vacuum forming die in the longitudinal direction.
An apparatus for manufacturing a heat insulating tubular body with a skin, wherein a groove or a ridge is provided in a width direction of the vacuum forming belt on a surface of the vacuum forming belt that abuts on the skin sheet. 3. The vacuum groove according to claim 2, wherein the groove or ridge provided on the surface of the vacuum forming belt that contacts the skin sheet member is provided obliquely with respect to the traveling direction of the vacuum forming belt. Manufacturing device for heat insulation tubular body with skin.