JP5038817B2 - Manufacturing method of pipe with heat insulating material - Google Patents

Description

  The present invention relates to a method for manufacturing a pipe with a heat insulating material.

  In recent years, resin pipes made of polybutene or the like have been widely used as pipes for water supply and hot water supply. When a resin pipe is used for water supply or hot water supply, the resin pipe is covered with a foamed material (heat insulating material) made of polyethylene or the like for heat insulation and insulation particularly in cold regions (see, for example, Patent Document 1).

In general, a resin pipe is manufactured on a pipe manufacturing line, packed and cured, and then covered with a heat insulating material in another coating line.
That is, as shown in FIG. 4A, the resin pipe 512 is manufactured by extrusion molding in the pipe manufacturing line 500. In addition, it shape | molds, taking in with the taking-in apparatus 502. FIG. In addition, the resin pipe 512 is wound in a coil shape by the winding device 506, and is cut to a certain length by the cutting device 504.

  The resin pipe 512 wound in a coil shape is packed and cured as shown in FIG. It is cured (stored) for about a week. After being cured (stored), the resin pipe 512 is moved to a coating line 600 that covers the outer peripheral surface of the resin pipe 512 with a heat insulating material, as shown in FIG.

  In the coating line 600, the resin pipe 512 is sandwiched and guided between a pair of rollers 604 and 605 whose rotation axis is horizontal in the guide portion 602 and a pair of rollers 606 and 608 whose rotation axis is vertical. As a result, the resin pipe 512 is sent to the coating device 610 in a straight shape (substantially straight in the longitudinal direction).

In the coating apparatus 610, while the resin pipe 512 and the belt-shaped heat insulating material 514 are transported in the longitudinal direction, the heat insulating material 514 is deformed in the width direction, and the ends in the width direction are thermally fused (joined) to each other. The outer peripheral surface of 512 is covered with a heat insulating material 514, whereby the pipe 510 with a heat insulating material is manufactured (see, for example, Patent Document 2).
It is manufactured while being picked up by the pick-up device 612. Further, the pipe 510 with the heat insulating material is wound in a coil shape by the winding device 616 and cut by a cutting device 614 to a certain length.
JP 2000-97932 A JP 2005-125760 A

  Now, the resin pipe 512 wound up in the coil shape shown in FIG. 4 (B) is fired while being cured (stored). Therefore, the protective member 514 is covered with the covering device 610 while the guide 602 shown in FIG. However, since it is difficult to completely eliminate the vibration, the behavior of the resin pipe 512 becomes unstable due to the vibration. For this reason, when the heat insulating material 514 is deformed in the width direction and the end portions in the width direction are heat-sealed to each other, an adverse effect may be caused. For this reason, it has been difficult to improve the production speed.

  Further, as shown in FIG. 4 (B), a storage space is required for curing (storage) the resin pipe 512 wound up in a coil shape for about one week. It is necessary to carry the resin pipe 512 wound in a coil shape from the line 500 to the storage space of FIG. 4B and from the storage space of 4B to the covering line of FIG. 4C.

Furthermore, when the resin pipe 512 is held sideways, it is necessary to consider that the outer peripheral surface of the resin pipe 512 is not slid or damaged.
Therefore, improvement in productivity of pipes with a heat insulating material is desired.

  The present invention has been made to solve the above problems, and an object thereof is to provide a method for manufacturing a pipe with a heat insulating material with improved productivity.

The method of manufacturing a pipe with a heat insulating material according to claim 1 includes a pipe manufacturing process for manufacturing a pipe from a resin material, a cooling process for continuously cooling the pipe, and a cooling process performed after the pipe manufacturing process. It is performed continuously after the process, and while the pipe and the belt-shaped heat insulating material are transported in the longitudinal direction, the heat insulating material is deformed in the width direction and the end portions in the width direction of the heat insulating material are joined to each other. And a covering step of covering the outer peripheral surface with the heat insulating material in a non-adhesive manner .

  In the method for manufacturing a pipe with a heat insulating material according to claim 1, the heat insulating material is deformed in the width direction while the pipe and the belt-shaped heat insulating material are transferred in the longitudinal direction continuously after the pipe is manufactured from the resin material. A pipe with a heat insulating material is manufactured by joining ends in the width direction of the material and covering the outer peripheral surface of the pipe with a heat insulating material.

  Thus, after manufacturing a pipe, since a pipe is not wound up once in a coil shape, a heat insulating material is coat | covered in the state (the straight state before curing) in which the pipe has not been sprinkled. Therefore, since the heat insulating material is deformed in the width direction and the end portions in the width direction are joined to each other with almost no vibration of the pipe, the joining accuracy and joining strength are improved. This also makes it possible to improve the manufacturing speed.

In addition, a storage space for winding and curing (storage) the pipe is unnecessary, and a process of carrying the pipe wound in a coil shape is also unnecessary. Further, when the pipe is held sideways, it is not necessary to consider that the outer peripheral surface of the pipe is free from scratches and dirt.
Therefore, productivity of manufacturing a pipe with a heat insulating material is improved.

  The method for manufacturing a pipe with a heat insulating material according to claim 2 is characterized in that, in the manufacturing method according to claim 1, the end portions of the heat insulating material are joined together by heat fusion.

  In the method for manufacturing a pipe with a heat insulating material according to claim 2, since the end portions of the heat insulating material are bonded to each other by heat fusion, for example, the bonding process is easier than bonding with an adhesive. Therefore, productivity is further improved.

  According to a third aspect of the present invention, there is provided the method for producing a pipe with a heat insulating material according to the first or second aspect, wherein the resin material is a polybutene resin or a cross-linked polyethylene resin.

  In the method for manufacturing a pipe with a heat insulating material according to claim 3, the pipe is manufactured using polybutene resin or cross-linked polyethylene resin as a resin material. That is, the pipe is made of polybutene resin or cross-linked polyethylene resin. Since polybutene resin or cross-linked polyethylene resin is prone to scorching, it is preferable to coat the pipe with a heat insulating material without winding it into a coil once after manufacturing the pipe.

  In addition, when tap water is passed through the pipe, it is preferable to use a pipe made of boribten resin or cross-linked polyethylene resin as a countermeasure against chlorine contained in the tap water.

  As described above, according to the present invention, there is an excellent effect that the productivity of the pipe with the heat insulating material can be improved.

Hereinafter, the manufacturing method of the pipe with a heat insulating material which concerns on embodiment of this invention is demonstrated using FIGS. 1-3.
First, the pipe 10 with a heat insulating material will be described with reference to FIG.
As shown in FIG. 1, the pipe 10 with the heat insulating material is covered with the foamed material 14 as the heat insulating material on the outer peripheral surface 12 </ b> A of the resin pipe 12 (see also FIGS. 3A and 3B). It is structured. The foam material 14 is shaped like a strip, and the end portions 14A (see also FIG. 3B) in the width direction are joined to each other to form a cylindrical shape covering the outer peripheral surface 12A of the pipe 12. Note that the end portions 14 </ b> A in the width direction of the foamed material 10 are joined by thermal fusion in the present embodiment.

  Further, in the present embodiment, the pipe 12 is a 15φ borib den pipe made of boribten resin. The foamed material 14 is a polyethylene sheet having a thickness of 5 mm formed by forming a polyethylene film on the surface. The foam material 14 is not limited to this. For example, a resin foam material (foamed sheet) represented by polypropylene, polystyrene, phenol, polyurethane, or the like may be used.

Next, a schematic configuration and manufacturing process of the manufacturing line 100 for manufacturing the pipe 10 with a heat insulating material shown in FIG. 1 will be described with reference to FIG.
As shown in FIG. 2, an extruder 110 is provided at the most upstream part of the production line 100. The polybutene resin P as a resin material charged from the hopper 112 of the extruder 110 is heated in a cylinder (not shown) with a heater (not shown) provided therein, and is also screwed (not shown). Kneaded. Then, it is extruded by a screw (not shown) and is extruded into a circular cylinder (pipe shape) by a die 114 provided at a discharge port at the tip of the extruder 110.

  A water tank 120 composed of a vacuum water tank 122 and a cooling water tank 124 is provided on the downstream side of the extruder 110. The pipe 12 pushed out from the extruder 110 is formed into a desired size (outer shape and inner diameter) in the upstream vacuum water tank 122 and cooled when passing through the downstream cooling water tank 124.

A dimension measuring device 130 is provided on the downstream side of the water tank 120, and it is confirmed that the pipe 12 is formed in a desired size.
A printing device 134 is provided on the downstream side of the dimension measuring instrument 130, and marks are printed on the outer peripheral surface 12A of the pipe 12 at predetermined intervals.

A first take-up device 140 is provided on the downstream side of the printing device 134. The pipe 12 is manufactured while being drawn by the take-up device 140 (the pipe 12 is sandwiched and pulled between the conveyor belts 142 and 144 of the take-up device 140 and sent out downstream).
The pipe manufacturing process 102 is performed from the extruder 110 to the first take-up device 140.

  A guide unit 150 is provided on the downstream side of the take-up device 140. The guide unit 150 includes roller pairs 152 and 154 whose rotation axes are horizontal and roller pairs 153 and 155 whose rotation axes are vertical, and is sandwiched between these roller pairs 152, 153, 154 and 155. And guided to the downstream side. By being guided and transported to the downstream side in this way, the resin pipe 12 is sent to the coating device 200 in a straight shape (in a state of being substantially straight in the longitudinal direction).

  A coating device 200 that covers the outer peripheral surface 12 </ b> A of the pipe 12 with a strip-shaped foam material 14 is provided on the downstream side of the guide portion 150. In the coating apparatus 200, while the pipe 12 and the strip-shaped foam material 14 are transported in the longitudinal direction, the foam material 14 is deformed in the width direction so as to form a cylindrical shape so as to cover the outer peripheral surface 12A of the pipe 12, and in the width direction of the foam material 14 By joining the end portions 14A of each other by heat fusion, the pipe 10 with the heat insulating material covered with the heat insulating material is obtained. The detailed structure of the coating apparatus 200 will be described later.

  A second take-up device 160 is provided on the downstream side of the coating device 200. The pipe 10 with a heat insulating material is manufactured while being drawn by the take-up device 160 (the pipe 12 is sandwiched and pulled between the transport belts 162 and 164 of the take-up device 160 and sent out downstream).

  A cutting device 170 is provided on the downstream side of the take-up device 160, and a winding device 174 is provided on the downstream side of the cutting device 170, that is, the most downstream portion of the production line 100. The winder 174 winds up the pipe 10 with the heat insulating material in a coil shape, and the cutting device 170 cuts the pipe 10 with the heat insulating material at a predetermined length.

  On the other hand, the strip-shaped foam material 14 wound in a coil shape is mounted on the foam material mounting portion 180. Then, the foam material 14 is sprinkled over a plurality of transport rollers 182 to 189 and is transported to the coating apparatus 200 described above.

  Next, the coating of the foam material 14 on the pipe 12 in the coating apparatus 200 will be described with reference to FIG. 3B is a cross-sectional view taken along the line BB in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line CC in FIG.

As shown in FIG. 3 (A), the foam material 14 is successively squeezed into a circular cylinder while being attached to the outer peripheral surface 12A of the pipe 12 (see also FIG. 3 (B)). And, just before the squeezing is completed, the hot air device 202 blows the hot air N to the end portion 14A in the width direction of the foam material 14 and heats it to bring it into a molten state. As a result, the foam material 14 is coated on the outer peripheral surface 12 </ b> A of the pipe 12. And after the foam material 14 is coat | covered, while letting both pass in the cylindrical die | dye 204 and adjusting the external shape of the foam material 14 (refer FIG.3 (C)).
In addition, the process from the guide part 150 to the winding device 174 is the covering process 104 for the pipe 12 of the foam material 14.

Next, the operation of this embodiment will be described.
As described so far, after the pipe 12 is manufactured, the pipe 12 is not wound up into a coil shape once, so that the pipe 12 is continuously rolled in a state where no cracks are formed (straight state before curing). The foam material 14 is coated on the pipe 12 by the coating apparatus 200. Therefore, in the state where there is almost no vibration of the pipe 12, the foam material 14 is deformed in the width direction and the end portions 14A in the width direction are thermally fused (joined), so that the joining accuracy and strength are improved. As a result, the production speed can be improved.

  In addition, since the pipe 12 does not have a firewood rod, the guide portion 150 can be omitted when the necessity of guiding with the guide portion 150 is low.

  Further, a space for winding and curing (storing) the pipe 12 is not required, and a process for transporting the pipe 12 wound in a coil shape is not required. Furthermore, when the pipe 12 is held sideways, it is not necessary to consider that the outer peripheral surface 12A of the pipe 12 is slid to prevent scratches or dirt. Therefore, the productivity of the pipe 10 with a heat insulating material is improved.

  Further, since the end portions 14A in the width direction of the heat insulating material 14 are joined by heat fusion, the joining process is easy. Therefore, the productivity of the pipe 10 with a heat insulating material is further improved. Note that the heat fusion method may be performed by a method other than the hot air N blowing by the hot air device 202. For example, an electric heating iron may be used, or both the hot air device 202 and the electric heating iron may be used.

Further, the pipe 12 is manufactured using polybutene resin as a resin material. That is, the pipe 12 is a polybutene pipe made of polybutene resin. Since polybutene resin is prone to scorching, it is preferable to continuously coat the heat insulating material 14 on the pipe 12 after the pipe 12 is manufactured without winding it into a coil shape after the pipe 12 is manufactured. It is. In addition, when tap water is passed through the pipe 12 for water supply or hot water supply, it is preferable to use a bolybten resin (use a polybden pipe) as a countermeasure against chlorine contained in the tap water.
It is also preferable to manufacture the pipe 12 with a crosslinked polyethylene resin instead of the polybuden resin.

  In addition, as shown in FIG. 4, when the pipe manufacturing process (FIG. 4A) and the covering process (FIG. 4C) are separate production lines, the winding devices 506, 616 and the cutting device 504, Two 514 are required each. On the other hand, in the manufacturing process of the heat insulating material-equipped pipe 10 according to the present embodiment shown in FIG. 2, only one winding device 174 and cutting device 170 are required, so that manufacturing facilities can be reduced. Further, if it is sufficient to have one second take-up device 160, the first take-up device 140 can be omitted.

In addition, this invention is not limited to the said embodiment.
For example, in the above embodiment, the pipe manufacturing process 102 (see FIG. 2) for manufacturing the pipe 12 is manufactured by extrusion molding, but is not limited thereto. Manufacturing (molding) methods other than extrusion molding may be used.

Further, for example, in the above embodiment, the pipe 10 is made of polybutene resin or cross-linked polyethylene resin, but is not limited thereto. The pipe 12 may be made of a resin other than polybuden resin or cross-linked polyethylene resin.
For example, in the said embodiment, although the edge parts 14A of the width direction of the heat insulating material 14 were joined by heat sealing | fusion, it is not limited to this. For example, you may join by an adhesive agent.

It is a perspective view which shows typically the pipe with a heat insulating material which concerns on embodiment of this invention. It is process drawing which shows typically the manufacturing process of the pipe with a heat insulating material which concerns on embodiment of this invention. (A) is explanatory drawing explaining a mode that a foaming material is coat | covered with a coating apparatus, (B) is BB sectional drawing of (A), (C) is CC of (A). It is sectional drawing. (A) is the figure which shows the production line of a resin pipe in manufacture of the conventional pipe with a heat insulating material, (B) is a figure which shows the curing of a resin pipe, (C) is covering the resin pipe with a heat insulating material. It is a figure which shows the coating line to perform.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe with heat insulating material 12 Pipe 12A Outer peripheral surface 14 Heat insulating material 14A End 102 Pipe manufacturing process 104 Coating process P Polybutene resin (resin material)

Claims (3)

A pipe manufacturing process for manufacturing a pipe from a resin material;
A cooling step that is performed continuously after the pipe manufacturing step and cools the pipe;
It is carried out continuously after the cooling step , deforms the heat insulating material in the width direction while transferring the pipe and the belt-shaped heat insulating material in the longitudinal direction, and joins the end portions in the width direction of the heat insulating material to each other. A covering step of covering the outer peripheral surface of the pipe non-adhesively with the heat insulating material;
The manufacturing method of the pipe with a heat insulating material characterized by providing.   The method for manufacturing a pipe with a heat insulating material according to claim 1, wherein the end portions of the heat insulating material are joined together by heat fusion.   3. The method for manufacturing a pipe with a heat insulating material according to claim 1, wherein the resin material is a polybutene resin or a crosslinked polyethylene resin.

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