JPH05118493A - Sheathed heat insulating tubular body with skin sheet and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a sheathed heat insulating tubular body having a skin sheet, and a method for the manufacture thereof whereby features such as availability of circularity at all times and the sufficient covering of hot insulated pipes of various sizes can be obtained. CONSTITUTION:A slit section 2a having an oblique slit with a radial direction is formed in a thick-wall tubular body 2 of foamed resin and, therefore, a contact area becomes large at a section with adjacent slit edges, thereby absorbing a difference between the inner diameter of the tubular body 2 and the outer diameter of a hot insulated pipe 4. Also, pressure acting in a radial direction can be dispersed in a peripheral direction. During a manufacture process, for example, the tubular body 2 is not easily strained, due to a force acting toward the center thereof in relation to such a work for applying a skin sheet 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a heat insulating member for covering the outer peripheral portion of a heat-insulated pipe such as a heat medium feeding pipe for air conditioning, and a slit portion is formed in the pipe length direction. The present invention relates to a coated heat insulating tubular body with a skin sheet and a method for producing the same.

[0002]

2. Description of the Related Art A coated heat insulating tubular body of this type is based on a thin resin film-like body on the outer peripheral surface of a thick-walled tubular body made of foamed resin and having a portion slit in the pipe length direction and having a C-shaped cross section. A skin sheet as a material is attached, and a fin-shaped portion having an unpeeled separator (separator remaining portion) is formed at one end of the skin sheet in the sheet width direction.

Therefore, since the tube diameter of the thick-walled tubular body can be freely expanded and contracted, if the tube diameter size of the heat-insulated tube is within a predetermined range, the heat-insulated tubes of various sizes can be easily inserted. Moreover, if the remaining portion of the separator is peeled off and attached so as to cover the slit portion, the heat-insulated pipe and the coated heat insulating tubular body can be easily integrated.

In this case, the slitted portion is formed so as to be along the inner side of the root of the fin-shaped portion and cut in the diametrical direction passing through the axial center of the thick-walled tubular body. There is.

[0005]

However, according to the above-mentioned conventional structure, since the slit portion is formed by being cut in the diametrical direction passing through the axial center of the thick-walled cylindrical pipe body, for example, a skin sheet is provided on the outer peripheral surface. When affixed to the, when a strong force toward the center of the thick tubular body acts strongly, especially the slit portion is easily deformed and roundness of the thick tubular body is likely to be lost, and the abutting of the slit portion The condition is not sufficient and the heat-insulated pipe cannot be sufficiently covered. The defect due to the insufficient butted state of the slit portions is particularly remarkable when the difference between the outer diameter of the heat-insulated pipe and the inner diameter of the thick-walled tubular body is relatively large.

[0006] It is an object of the present invention to provide a coated heat insulating tubular body with a skin sheet and a method for producing the same, which is capable of sufficiently coating a heat-insulated tube.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 is affixed to the outer peripheral surface of a thick-walled tubular body made of a foamed resin, which is slit in the lengthwise direction of the tube for inserting a heat-insulated tube. A coated heat insulating tubular body with a skin sheet having a skin sheet formed so that a fin-shaped portion for covering the slit portion extends along the pipe length direction from the vicinity of the slit portion, The formed portion is formed so as to have an oblique slit direction with respect to the diametrical direction of the thick-walled tubular body.

According to the second aspect of the present invention, a cylindrical tubular body made of foamed resin is drawn out in the tube length direction, a skin sheet having a separator attached to one sheet surface is drawn out in the sheet length direction, and a part of the separator is a sheet. Peeling along the sheet length direction so as to remain at one end in the width direction, the applied portion of the adhesive exposed by the peeling is opposed to the cylindrical tubular body, the skin sheet is a separator remaining at the one end. Except that the sheet is bent and deformed so that both ends thereof in the width direction are substantially abutted, and the cylindrical sheet having the outer skin sheet attached to the outer peripheral surface is inside the base of the separator left at one end of the outer skin sheet. It is characterized in that it is cut along the vicinity thereof so as to have a slit direction oblique to the diameter direction of the cylindrical tubular body.

According to a third aspect of the present invention, a foamed resin sheet is unrolled in the sheet length direction, and a skin sheet having a separator attached to one sheet surface is unrolled in the sheet length direction.
The separator is peeled off along the sheet length direction so that a part of the separator remains at one end in the sheet width direction, and the adhesive-applied part exposed by the peeling is opposed to the inner surface of the rolled-out sheet body. After that, a laminated body is formed by laminating the skin sheet on the sheet body, and the laminated body is arranged so that the skin sheet side is the outer side, and both end portions of the sheet body in the sheet width direction substantially abut each other. The sheet is bent and deformed to heat-bond both ends of the sheet body in the sheet width direction to each other, and the cylindrical tube formed by the heat-sealing has a base of the separator left at one end of the skin sheet. It is characterized in that it is cut along the vicinity of the inside of the portion so as to have a slit direction oblique to the diameter direction of the cylindrical tubular body.

[0010]

Since the slit portion formed in the thick-walled tubular body made of foamed resin is formed obliquely with respect to the diametrical direction, the abutted portions forming the slit portion have a large contact area and the tubular body It is possible to absorb the difference between the inner diameter of the tube and the outer diameter of the tube to be kept warm. In addition, the pressure applied in the pipe radial direction can be dispersed in the pipe circumferential direction, and the pipe body is not easily distorted by a force toward the center during, for example, the attachment of the skin sheet during the manufacturing process.

[0011]

EXAMPLE FIG. 1 shows a coated heat insulating tubular body 1 with a skin sheet according to the present invention, which is roughly composed of a thick tubular body 2 and a skin sheet 3 attached to the outer peripheral surface of the tubular body 2. Has been done.

The thick-walled tubular body 2 is made of foamed resin, for example, foamed polyethylene having a foaming ratio of 5 to 40 times, an outermost diameter of 20 to 200 mm, and a tube thickness of 5 to 30 mm, and has a slit portion along the tube length direction. 2a is formed and the slit portion 2a is formed.
Has a slit direction oblique to the diametrical direction passing through the axis of the tubular body 2.

The skin sheet 3 is made of a thin resin film material such as polyvinyl chloride having a thickness of 40 to 300 μm as a base material, and an acrylic adhesive 3a is provided on the inner surface side. It has been applied.

Further, a fin-shaped portion 3b is formed at the end of the skin sheet 3 along the pipe length direction of the tubular body 2. In the fin-shaped portion 3b, the adhesive 3a is exposed when the separator (separator remaining portion 4a) attached to the fin-shaped portion 3b is peeled off during use.

The tubular body 2 covers the heat-insulated pipe 4, but since the slit portion 2a is formed obliquely, the contact area of the abutted portion of the slit portion 2a is diametrical. It becomes larger than that formed on P. The heat-insulated pipe 4 is typically a copper pipe for feeding a heat medium, for example.

FIG. 2 shows a first embodiment of the manufacturing apparatus for the above-mentioned heat-insulating tubular body 1, in which a tubular body supply reel 5 constituting the tubular body feeding means and a skin sheet constituting the epidermal sheet delivering means. Supply reel 6, peeling roll 7 constituting peeling means, primary molding guide 8 constituting guide means, secondary molding guide 9 constituting curving and deforming means, molding belt 10 constituting take-up molding means, oblique slit portion forming means. It is roughly composed of a barrel diagonal slanting mechanism 20.

On the supply reel 5, a foamed resin having a C-shaped cross section with slits formed in the pipe length direction (for example, foaming ratio is 5 to 40 times, outermost diameter is 20 to 200 mm, and pipe thickness is 5 to 3).
A cylindrical tube body 11A made of 0 mm foamed polyethylene) is mounted, and the cylindrical tube body 11A fed from the supply reel 5 is introduced into the primary molding guide 8 through a guide conduit 13. There is.

Here, the cylindrical tube body 11A is generally molded by an ordinary method using an extruder. It is to be noted that a conventionally known tubular molding device, that is, a device configured to bend and deform a sheet body made of the foamed polyethylene in a sheet length direction while causing both ends in a sheet width direction to abut each other. You may make it shape | mold using.

Further, a separator 17 is attached on the pressure-sensitive adhesive coated surface 3a of the skin sheet 3 mounted on the supply reel 6, and when the separator 17 passes through the peeling roll 7, The fin-shaped portion 3b is peeled off while leaving a considerable width.

The skin sheet 3 which has passed through the peeling roll 7
Is introduced into the primary molding guide 8 via the relay roll 16, while the separator peeling portion 17b peeled off by the peeling roll 7 is mounted on the recovery reel 18. There is.

Further, the secondary molding guide 9 is provided on the downstream side of the primary molding guide 8, and the molding belt 10 is provided on the downstream side of the secondary molding guide 9. The forming belt 10 is a two-stage upper and lower running belt 10.
A running belt 10A in the upper stage is wound around pulleys 10a and 10b, and a running belt 10B in the lower stage is wound around pulleys 10c and 10d.

The primary molding guide 8 has a trumpet tubular shape as a whole, and is expanded in a hem-splitting manner from the midway portion toward the upstream end, while the range from the midway portion to the downstream end is It is formed in a guide hole having a circular cross section, and a slit hole is formed substantially in the center of the upper surface of the guide hole. The primary molding guide 8 constitutes a guide means, and the guide hole portion thereof constitutes a bending deformation means.

A guide hole having a semicircular cross section is formed in the secondary molding guide 9, and the curved surface of the guide hole faces the lower side.

The upper molding belt 10A and the lower molding belt 10B are formed with molding holes having a semicircular cross section so as to face each other, and both molding holes form a circular guide hole.

The slanting slidable mechanism 20 provided on the downstream side of the molding belt 10 is composed of a disk-shaped rotary blade 20a. As shown in FIG. 3, the rotary blade 20a is rotated around a support shaft 20b. It is movably attached. In addition,
The direction along the rotating surface of the rotary blade 20a, in other words, the oblique slit direction K, is the diametrical direction P passing through the axis of the cylindrical tubular body 11A.
It has a predetermined crossing angle α with respect to the direction.

A primary semi-finished product tube body 19 is obtained on the downstream side of the molding belt 10, and a secondary semi-finished product tube body 21 is obtained on the downstream side of the slanting slitting mechanism 20. The semi-finished product pipe 2 is provided downstream of the secondary semi-finished product pipe 21.
Cutting means (not shown) for cutting 1 into an appropriate pipe length
Is provided.

Next, the operation of the first embodiment constructed as above will be described. The cylindrical tube body 11A fed from the supply reel 5 is inserted into the primary molding guide 8, and at this time, the skin sheet 3 fed from the supply reel 6 is inserted into the molding guide 8. The skin sheet 3 in the molding guide 8 has an adhesive coated surface 9a corresponding to the peeling portion 12b of the separator 17 exposed, and a fin-shaped portion 9b is formed at one end of the skin sheet 3.

Therefore, in the primary molding guide 8, the adhesive coating surface 3a corresponding to the peeling portion 17a is exposed, and the cylindrical tube body 11 is opposed to the adhesive coating surface 3a. The pressure-sensitive adhesive application surface 3a is attached to the outer peripheral surface of the cylindrical tube body 11 while being guided by the inner surface of the molding guide 8. When the skin sheet 3 passes through the primary molding guide 8, the skin sheet 3 travels with the fin-shaped portion 3b inserted in the slit.

The cylindrical tube 11A having the outer skin sheet 3 attached to the outer peripheral surface thereof, after passing through the primary molding guide 8,
Although it travels toward the forming belt 10, it passes through the secondary forming guide 9, so that it is easy to enter the forming belt 10.

Further, the cylindrical tubular body 11A fed into the forming belt 10 and having the skin sheet attached thereto has the above-mentioned both belts 10
It passes between A and 6B, but at this time both belts 10A,
The pressure-sensitive adhesive applied surface 3 is formed by sandwiching between 10B.
a is uniformly attached to the outer peripheral surface of the cylindrical tubular body 11A, and the primary semi-finished product tubular body 19 is obtained.

Primary semi-finished product tube body 1 manufactured as described above
9 is, as shown in FIG.
The rotary blade 20a is obliquely cut along the inside of the fin-shaped portion 3b to form the slit 2a. As shown in the figure, the fin-like portion 3b is in a standing state in order to avoid contact with the rotary blade 20a.

The secondary semi-finished product tubular body 21 in which the diagonal slits are formed by the slanting slitting mechanism 20 is cut into a length according to the specifications by an appropriate cutting means to form the coated heat insulating tubular body 1 as the product. Here, the production speed is, for example, 1 to 3 per minute.
It can be set to 0 m, which is suitable for mass production.

When the skin sheet 3 is made of a polyvinyl chloride base material, the polyvinyl chloride is
Since it has excellent heat resistance, weather resistance, workability, etc., it is useful when applied to the coated heat-insulating tubular body 1.

FIG. 4 shows the construction of the second embodiment of the present invention. In this embodiment, the supply reel 1 in the first embodiment is provided with a foamed resin sheet body 11B having a predetermined thickness. The point of wearing is very different.

The sheet body 12 is mounted on the supply reel 1, and the sheet body 1 unwound from the supply reel 1.
2 is opposed to the exposed pressure-sensitive adhesive application surface 3a of the skin sheet 3 on the running belt 23 on the upstream side of the hollow molding die 22 having a substantially semicircular cross section, whereby the laminate 12 is formed. The laminated body 12 is formed in the molding die 22 so as to be curved and formed into a cylindrical shape.

The traveling belt 23 has a perforated belt surface and is wound around pulleys 25, 26 and 27. A suction mechanism 24 is provided below the molding die 22 and below the perforated belt surface.

In this embodiment, a heater 28 is provided near the upstream end side of the molding die 22 in order to facilitate the curved molding of the sheet body 11A. In addition, a seal blade 29 serving as a heat-sealing means is provided near the downstream end of the molding die 22.
Is provided, and the seal blade 29 comes into contact with one end portion of the sheet body 11A constituting the curved body 12A, which is substantially abutted, in the sheet width direction in a heated state.

Further, in this embodiment, similarly to the first embodiment, the slanting mechanism 20 is provided to form the slant slit portion in the cylindrical primary semi-finished product tubular body 19.
Its configuration and operation are the same as above.

As described above, the sheet body 11 is used in the second embodiment.
Since A is used, the supply source of the material is closer to the raw material state as compared with the first embodiment, and the automation range of the work until the completion of the product is expanded, and the full automation is more realistic. Will be things.

[0040]

As described above, according to the invention of claim 1,
Affixed to the outer peripheral surface of a thick-walled tubular body made of foamed resin that is slit in the tube length direction to insert a heat-insulated tube, and a fin-like portion for covering the slitted portion is provided near the slitted portion. In a covered heat insulating tubular body with a skin sheet having a skin sheet formed so as to project along the pipe length direction, the slitted portion has a slit direction oblique to the diameter direction of the thick pipe body. Since the thick-walled tubular body is less likely to be deformed and the roundness can be maintained at all times, the outer diameter of the heat-insulated pipe can be maintained even if the slits are not sufficiently abutted. And the inner diameter of the coated tubular body can be absorbed, and thus the heat-insulated tube can be sufficiently coated.

According to the second aspect of the present invention, the cylindrical tubular body made of foamed resin is drawn out in the tube length direction, the skin sheet having the separator attached to one sheet surface is drawn out in the sheet length direction, and the separator is partially formed. Is peeled along the sheet length direction so as to remain at one end in the sheet width direction, the coated portion of the adhesive exposed by the peeling is made to face the cylindrical tubular body, and the skin sheet remains at the one end. Except for the separator, the sheet width direction both ends are curved and deformed so as to substantially abut, the cylindrical sheet having the skin sheet attached to the outer peripheral surface, the base of the separator left at one end of the skin sheet. It is characterized in that it is cut along the vicinity of the inner side of the cylindrical tubular body so as to have a slit direction oblique to the diameter direction of the cylindrical tubular body. The supply of the cylindrical tube until the completion of the product, eliminates manual work as much as possible, thereby improving the production efficiency. Therefore, even a specially trained worker can obtain a uniform product, which is suitable for mass production.

According to the third aspect of the present invention, the foamed resin sheet is drawn out in the sheet lengthwise direction, and the skin sheet having the separator attached to one of the sheet surfaces is drawn out in the sheet lengthwise direction. After peeling along the sheet length direction so that a part remains at one end in the sheet width direction, and facing the inner surface of the fed sheet body with the applied portion of the adhesive exposed by the peeling, A laminated body is formed by laminating an outer skin sheet on the sheet body, and the laminated body is curved and deformed so that the outer skin sheet side is the outer side and both ends of the sheet body in the sheet width direction substantially abut. , Heat-bonding both ends of the sheet body in the sheet width direction that are abutted to each other, and in the cylindrical tube body formed by the heat-sealing, the inside of the base of the separator left at one end of the skin sheet. It is characterized in that it is cut along the neighborhood so as to have an oblique slit direction with respect to the diameter direction of the cylindrical tubular body, so that the automation range up to the completion of the product compared to the invention of claim 2 is Expanding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a heat insulation coating tubular body with a skin sheet according to the present invention.

FIG. 2 is a schematic side view showing a first embodiment of an apparatus for carrying out the manufacturing method according to the present invention.

FIG. 3 is a side view showing a configuration of a sliding mechanism.

FIG. 4 is a schematic side view showing the configuration of the device according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover heat insulation tubular body, 2 Thick wall tubular body, 2a diagonal slit part, 3 skin sheet, 3b fin-shaped part, 4 heat insulation pipe, 20 diagonal slidable mechanism.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B29K 105: 04 B29L 23:00 4F

Claims (3)

[Claims] 1. An affixed to an outer peripheral surface of a thick-walled tubular body made of a foamed resin, which is slit in a longitudinal direction to insert a heat-insulated tube,
In a covered heat insulating tubular body with a skin sheet, the fin-shaped portion for covering the slit portion has a skin sheet formed so as to project along the pipe length direction from the vicinity of the slit portion, and the slit is formed. The covered portion is formed so as to have a slit direction oblique with respect to the diametrical direction of the thick-walled tubular body, the covered heat-insulating tubular body with a skin sheet. 2. A cylindrical tubular body made of foamed resin is delivered in the pipe length direction, a skin sheet having a separator attached to one sheet surface is delivered in the seat length direction, and a part of the separator has one end in the sheet width direction. Peeled along the sheet length direction so as to remain in the sheet, the coated portion of the pressure-sensitive adhesive exposed by the peeling is opposed to the cylindrical tubular body, the skin sheet except for the separator remaining at the one end, and the sheet width thereof. Curved deformation so that both ends in the direction substantially abut, the cylindrical sheet with the skin sheet attached to the outer peripheral surface, along the vicinity of the inside of the base of the separator left at one end of the skin sheet, and A method for producing a coated heat-insulating tubular body with a skin sheet, comprising cutting so as to have a slit direction oblique to the diameter direction of the cylindrical tubular body. 3. A foamed resin sheet is drawn out in the sheet lengthwise direction, a skin sheet having a separator attached to one of the sheet surfaces is drawn out in the sheet lengthwise direction, and a part of the separator is one end in the sheet width direction. Is peeled along the sheet length direction so as to remain, and the coated portion of the adhesive exposed by the peeling is made to face the inner surface of the rolled-out sheet body, and then the skin sheet is laminated on the sheet body. A laminated body is formed, and the laminated body is curved and deformed so that the skin sheet side is the outer side and both ends of the sheet body in the sheet width direction substantially abut, and the abutted sheets in the sheet body. Both ends in the width direction are heat-sealed, and the cylindrical tube formed by the heat-sealing is along the vicinity of the inner side of the base of the separator left at one end of the skin sheet, and the cylindrical tube is formed. The method for producing a coated heat-insulating tubular body with a skin sheet, comprising cutting so as to have a slit direction oblique to the diametrical direction.