JP4918286B2 - Resin coated pipe - Google Patents

Description

  The present invention relates to a resin-coated pipe coated with a synthetic resin, such as a support used as an agricultural material or a gardening material.

  In general, a resin-coated pipe obtained by coating the outer peripheral side surface of a pipe with a synthetic resin is widely used as a column used as an agricultural material or a gardening material.

  Since such a resin-coated pipe is applied so that the coating resin is not easily peeled off during use, it is not easy to peel the coating resin from the pipe material after use. Therefore, after use, it is discarded as industrial waste as it is, or using a large facility such as a separator or pulverizer, the coating resin is peeled off from the pipe material, and each is used as a separate disposal or recycling material. Has been made. In this latter treatment method, it is necessary to collect the resin-coated pipe, and it takes time to collect, and there is a problem in that it is difficult to process the bent resin-coated pipe.

  Therefore, in order to easily separate the coating resin from the pipe material, a resin-coated pipe in which a linear body is included in the longitudinal direction of the coating resin portion has been proposed. As a result, when the end of the linear body is pulled back and pulled, the coating resin is cut by the linear body, so that the coating resin is peeled off from the pipe material even without a large facility such as a separator or a pulverizer. It is something that can be done. (For example, refer to Patent Document 1).

JP 2001-79968 A

  However, the resin-coated pipe has the following problems. That is, when pulling out the end of the linear body to pull the linear body, it is necessary to make a cut with a blade such as a cutter in the vicinity and pick up the part, so the work is complicated, and There was a problem that it was difficult to pull it strongly even when the linear body was picked. In particular, when the number of resin-coated pipes is large, this operation is very time-consuming.

  The present invention aims to provide a coated resin pipe that solves the above-described problems, can easily cut the coated resin, and facilitates the work of peeling the coated resin from the pipe material.

In order to achieve the above object, the present invention is configured as follows.
That is, the coated resin pipe according to the present invention is a synthetic resin in which an insertion portion smaller in size than the inner shape of the pipe material is formed on at least one end of a pipe material having an appropriate length and on one end of a flange portion substantially equal to the outer shape of the pipe material. The insertion part of the resin plug is inserted, a synthetic resin coating layer is formed from the outer peripheral side surface of the pipe material to the outer peripheral side surface of the flange, and a linear shape is formed between the outer peripheral side surface of the pipe material and the coating layer. The body is provided, and the end of the linear body is located between the outer peripheral side surface of the collar and the covering layer.

  According to the present invention, since the linear body is provided between the outer peripheral side surface of the pipe material and the covering layer, if the end of the linear body is pulled and pulled, the covering layer can be torn and peeled off. The operation is easy and the pipe material and the coating layer can be separated.

  Also, when the plug body is removed from the pipe material, since the pipe material and the plug body are connected via the linear body, a cut is made near the end of the linear body and the end is pulled up. Even if a troublesome operation is not performed, if the linear body is pulled back with this stopper, the coating layer is torn by the linear body, so that the operation of peeling the coating layer from the pipe material becomes easy.

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

  That is, FIG. 1 is a perspective view showing an embodiment of a coated resin pipe according to the present invention. The coated resin pipe P includes a pipe material 1, a plug body 2 attached to the end of the pipe material 1, a coating layer 3 covering the pipe material 1 and the plug body 2, a pipe material 1 and a plug body 2, It is mainly composed of linear bodies 4 provided between the layers 3.

  As the pipe material 1, generally, a steel pipe having high strength and low cost is preferably used, but other metals such as aluminum alloy and stainless steel, or polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polycarbonate Tubular bodies made of synthetic resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide, polyurethane, polyacrylonitrile, ABS, AAS, phenol resin, unsaturated polyester resin, epoxy resin, and FRP may be used. Furthermore, although the cross-sectional shape of the pipe material 1 is not particularly limited, such as a circle, an ellipse, or a polygon, a cross-sectional shape having a perfect circle shape is preferably used.

  The plug body 2 is formed of a synthetic resin, and includes a flange portion 21 and a fitting insertion portion 22 as shown in FIG. 2, and the flange portion 21 has a shape substantially equal to the cross-sectional outer shape of the pipe material 1. The insertion insertion part 22 projects from the one end surface of the collar part 21 in the longitudinal direction. In this embodiment, the fitting insertion portion 22 has substantially the same outer shape as the inner shape of the pipe material 1 and is reduced in diameter toward the tip to be small. Thereby, when inserting the insertion part 22 in the pipe material 1, it can insert smoothly, and since the edge part of the pipe material 1 is sealed from the plug body 2, it is preferable.

  The plug body 2 is attached to the pipe material 1 with the insertion portion 22 inserted into the pipe material 1. The plug body 2 only needs to be attached to at least one end of the pipe material 1. However, if the plug body 2 is attached to both ends of the pipe material 1, the intrusion of moisture from both ends of the pipe material 1 is prevented, and rusting due to this moisture occurs. Is preferable.

  The synthetic resin forming the plug 2 may be an α-olefin polymer such as polyethylene, polypropylene, or polybutene, or may be an ethylene-copolymerized α-olefin. Synthetic resins such as polyethylene terephthalate, polybutylene terephthalate, ABS resin, AAS resin, urethane resin, polyamide resin, phenol resin, etc. These resins may be used in appropriate combination.

  The covering layer 3 is formed from the outer peripheral side surface of the pipe material 1 to the outer peripheral side surface 23 of the flange portion 21 of the plug body 2. In this embodiment, ridges are intermittently formed in the longitudinal direction. When the coated resin pipe P according to this embodiment is used as a prop used as an agricultural material or a horticultural material, plants and the like are easily wrapped around. Although it is preferable, a form without protrusions may be used.

  The synthetic resin for the coating layer 3 may be an α-olefin polymer such as polyethylene, polypropylene, or polybutene, or may be a copolymer obtained by copolymerizing an α-olefin with ethylene. It may be copolymerized with vinyl, methacrylic acid or an ester thereof, acrylic acid or an ester thereof, or a synthetic resin such as polyethylene terephthalate, polybutylene terephthalate, ABS resin, AAS resin, urethane resin, polyamide resin or phenol resin. Well, these resins may be used in appropriate combination, but if a resin compatible with the plug body 2 is used, the synthetic resin is applied to the outer peripheral side surface 23 of the flange portion 21 of the plug body 2 by a synthetic resin extruder. When covered, the covering layer 3 and the flange portion 21 of the plug body 2 are preferably welded and integrated, and the plug body 2 is formed. If it is the same as a synthetic resin, since it becomes easy to weld-integrate with the collar part 21 of the plug body 2, it is more preferable.

  3A is a cross-sectional view taken along the line AA of FIG. 1 showing the arrangement of the linear bodies 4 according to the present embodiment, and FIG. 3B is a partially enlarged view of FIG. The linear body 4 is provided between the outer peripheral side surface of the pipe material 1 and the coating layer 3.

  4, (a) is a BB cross-sectional view of FIG. 1 showing a state of arrangement of the linear bodies 4 according to the present embodiment, and (b) is a partially enlarged view of (a). In the linear body 4, the end of the linear body 4 is located between the outer peripheral side surface 23 of the flange portion 21 of the plug body 2 and the coating layer 3.

  As a method of providing the linear body 4 as shown in FIG. 3 described above, the linear body 4 can be obtained by arranging the linear body 4 on the pipe material 1 and forming the coating layer 3 with a synthetic resin extruder. Is preferable because it is easily provided between the pipe material 1 and the coating layer 3. At this time, if the end portion of the linear body 4 is arranged on the outer peripheral side surface 23 of the flange portion 21 of the plug body 2, the linear body 4 is covered with the outer peripheral side surface 23 as shown in FIG. It is more preferable because it can be easily positioned between the layers 3.

  Next, in the resin-coated pipe P according to this embodiment, a method of cutting the coating layer 3 and peeling the coating layer 3 from the pipe material 1 will be described.

  FIG. 5 is an explanatory view showing an embodiment of a method for peeling the coating layer 3 from the pipe material 1.

  First, as shown to (a), the cylindrical body 5 is engage | inserted in the location of the plug body 12 of the edge part of the resin coating pipe P. FIG. At this time, the linear body 4 is arranged so as to be positioned above the resin-coated pipe P. Next, the tubular body 5 is rotated so as to be bent upward with the vicinity of the proximal end portion of the fitting insertion portion 22 of the plug body 2 where the linear body 4 is located as a fulcrum. If the outer shape of the insertion part 22 of the plug body 2 is made toward the tip so as to have an arc shape in the longitudinal section with the end part of the insertion part 22 serving as a fulcrum at the time of rotation, The plug body 2 is easily pulled out of the pipe material 1 by the above-described rotation operation.

  In addition, if a relatively soft synthetic resin mainly composed of α-olefin such as polyethylene is used as the covering layer 3, the covering layer 3 is formed between the pipe material 1 and the plug body 2 during the rotation operation. It is more preferable because the plug body 2 is easily broken and the plug body 2 is easily pulled out from the pipe material 1.

  Further, when the cylindrical body 5 is rotated upward, the fitting insertion portion 22 of the plug body 2 is completely pulled out from the pipe material 1 and detached from the pipe material 1, and the linear body 4 is The two locations and the location of the pipe material 1 are connected via the linear body 4. In addition, the same operation | work can be performed even if it pinches | interposes the location of the plug body 2 with tools, such as pliers, instead of the cylindrical body 5. FIG.

  Subsequently, as shown in (b), when the plug body 2 is held and pulled in the longitudinal direction of the resin-coated pipe P according to the present embodiment so as to be folded back, the linear body 4 is covered. Layer 3 is torn up. Thereby, the coating layer 3 can be easily peeled from the pipe material 1.

  The linear body 4 only needs to have a hardness capable of making a cut in the coating layer 3 and a tensile strength that does not easily break even when pulled, and the cross-sectional shape may be a general circle, an ellipse, a polygon, Other shapes such as a flat plate shape may be used, but an iron wire having strength and flexibility that does not break even when pulled back is preferably used. In addition, the material of the linear body 4 is not limited to iron, but from other metals such as stainless steel and aluminum alloy, or a resin that is not easily thermally welded to the coating layer 3 such as nylon fiber or aramid fiber. It is sufficient that it has necessary hardness and tensile strength, and can be appropriately selected according to the tear strength and thickness of the coating layer 3.

  The structure of the linear body 4 may be the same as that of the above-mentioned material, but if the linear body 4 is coated with a resin highly compatible with the coating layer 3, the coating layer 3 is extruded with a synthetic resin. By forming the coating layer 3 by a machine, the coating resin 3 of the coating layer 3 and the linear body 4 is easily welded. Therefore, even if the operator pulls the plug body 2, the linear body 4 is removed from the plug body 2. This is preferable because it is difficult to come off and the work of tearing the coating layer 3 is facilitated. The welding is not limited to the state in which the linear body 4 is easily pulled out from the plug body 2 and is not necessarily so tight that the coating resin 41 and the coating layer 3 of the linear body 4 are integrated. May be.

  Furthermore, if the same type of coating resin 41 as that of the coating resin 3 is used as the coating resin 41 of the linear body 4, the coating resin 41 and the coating layer 3 are easily welded, so that the coating layer 3 is cut by the linear body 4. At this time, since the linear body 4 tears the coating layer 3 and the coating resin 41 and is easily separated from the coating resin 41, the labor for separating the linear body 4 and the coating resin 41 is reduced. preferable.

  According to the present invention, when discarding these in the coated resin pipe, the coating resin can be easily peeled off from the pipe material, and can be separated and discarded, or each material can be reused as a recycled material. It can be suitably used not only for a pillar used as a gardening material but also for a pipe member used as a handle such as a clothespin or a mop and having a stopper attached to the end.

1 is a perspective view showing an embodiment of a resin-coated pipe according to the present invention. It is a perspective view of the stopper of FIG. It is AA sectional drawing of the principal part of FIG. It is BB sectional drawing of the principal part of FIG. It is explanatory drawing which shows the use condition of the resin-coated pipe which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe material 2 Plug body 3 Cover layer 4 Linear body 5 Cylindrical body 21 Gutter part 22 Insertion part 23 Outer peripheral side surface 41 Coating resin P Resin coating pipe

Claims (1)

  A fitting portion of a synthetic resin plug body in which a fitting insertion portion smaller than the inner shape of the pipe material is formed at one end of a flange portion substantially equal to the outer shape of the pipe material is fitted to at least one end of a pipe material having an appropriate length. And a synthetic resin coating layer is formed from the outer peripheral side surface of the pipe material to the outer peripheral side surface of the flange, and a linear body is provided between the outer peripheral side surface of the pipe material and the coating layer. An end portion is located between the outer peripheral side surface of the collar portion and the covering layer.

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