JP3210534B2 - Plastic artificial wood, method of manufacturing plastic artificial wood, and coupled joiner used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic artificial tree used for a sidewalk fence or a vehicle protective fence installed along a sidewalk, a method of manufacturing a plastic artificial tree, and a connecting joiner used in the method. It is.

[0002]

2. Description of the Related Art Conventionally, a sidewalk fence and an anti-vehicle fence are shown in FIG.
As shown in FIG. 1, a beam B is stretched over a support S, and a plastic pseudo-wood is adopted for the support S and the beam B from the viewpoint of weather resistance and lightness. This plastic artificial wood is obtained by forming a plastic coating layer on the surface of a core material such as a steel pipe, and forming a tree-like uneven pattern on the surface of the plastic coating layer, which is described in Japanese Utility Model Publication No. 3-39229. like,
Manufactured by casting. That is, it is manufactured by arranging a metal tube, a metal rod, or the like as a reinforcing core material in a mold, and filling the mold with a molten resin to be a plastic coating layer.

[0003]

However, in the above-described method of manufacturing a plastic artificial wood by the casting method, the plastic artificial wood must be manufactured one by one, which results in low productivity and products having different outer diameters and lengths. Expensive molding dies are required for each size, so that there is a problem that the cost is increased and it is difficult to manufacture a long plastic artificial wood. In addition, the plastic artificial wood manufactured by such a casting method has a drawback that the appearance is inferior because a linear streak is formed in the longitudinal direction corresponding to the joint of the mold.

The present invention has been made in view of the above problems, and provides a plastic artificial wood having an excellent appearance, and can continuously produce a plastic artificial wood having an excellent appearance irrespective of its size. An object of the present invention is to provide a method of manufacturing a plastic artificial wood and a connecting joiner used in the method.

[0005]

The plastic artificial wood according to the present invention comprises a tubular body, a coating resin coated on the surface of the tubular body to form a textured texture, and annual rings attached to both ends of the tubular body. The coating resin is formed of a cap, and the coating resin is engaged with the inner peripheral surface near both ends thereof in the form of a ring-shaped reinforcing rib which is engaged with the end surface of the tubular body over the entire circumference, or is engaged at intervals in the circumferential direction of the end surface of the tubular body. A reinforcing rib is formed.

Further, in the method of manufacturing a plastic artificial wood according to the present invention, after connecting a pair of front and rear tubular bodies via a connecting joiner, the tubular body and the connecting joiner are heated while being fed, and are extruded on the surfaces thereof by extrusion molding. After coating the resin, a tree-like uneven pattern is formed on the coating resin, and then, after cooling the coating resin, the coating resin is cut off at the connecting joiner portion to remove the connecting joiner. Is mounted and subjected to an end surface treatment.

Further, the connecting joiner used in the method of manufacturing a plastic artificial wood according to the present invention has a first outer diameter portion having the same outer diameter as the outer diameter of the tubular body, and is fitted to the inner diameter of the tubular body at both ends. A second outer diameter portion having a fittable outer diameter, and located between the first outer diameter portion and the second outer diameter portion, smaller than the outer diameter of the first outer diameter portion, and a second outer diameter. A third outer diameter portion having an outer diameter larger than the outer diameter of the portion, and when the outer surface is coated with the coating resin in a state where the second outer diameter portion is fitted into the tubular body, the third outer diameter portion is formed. It is characterized in that a reinforcing rib that engages with the end face of the tubular body is formed by a coating resin coated on the diameter portion.

[0008]

According to the plastic pseudo wood of the present invention, an unnatural straight streak is not formed in the longitudinal direction of the peripheral surface of the pseudo wood, and it has an excellent appearance of a cut-out wood-like material. Since the coating resin that covers the surface has the reinforcing ribs that engage with the end surface of the tubular body, the resin shrinkage is suppressed, and even if the hole is drilled after molding, the displacement between the covering resin and the tubular body does not occur.

Further, in the method of manufacturing a plastic pseudo-wood of the present invention, a plastic pseudo-wood having an annual ring cap at both ends can be continuously produced irrespective of the size, so that the production efficiency is remarkably improved.

Further, in the connecting joiner used in the method of manufacturing a plastic artificial wood according to the present invention, a pair of front and rear tubular bodies can be connected to cope with continuous production of the plastic artificial wood, and the outer peripheral surface thereof is covered. Reinforcing ribs that engage with both end surfaces of the tubular body can be reliably formed on the coating resin.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a plastic artificial wood 1 according to the present invention. This plastic artificial wood 1
It comprises a tubular body 2, a coating resin 3 for uniformly covering the outer surface of the tubular body 2, and annual ring caps 4 attached to both ends of the tubular body 2. In addition to being formed, the annual ring cap 4 is formed with an annual ring pattern and has a wood-like appearance cut out as a whole.

As the tubular body 2 constituting the plastic artificial wood 1, a steel pipe is usually used, but a metal pipe such as an aluminum pipe or a stainless steel pipe or an FRP pipe may be used.

As the coating resin 3, a plastic such as polyethylene, polypropylene, polystyrene, polyvinyl chloride or ABS resin, or a foamed plastic thereof is used. And the coating resin 3
A ring-shaped reinforcing rib 3x is formed on an inner peripheral surface near both ends of the tubular member 2. The reinforcing rib 3x is engaged with the end surface of the tubular body 2 over the entire circumference. As a result, it is possible to reliably prevent the displacement between the tubular body 2 and the coating resin 3 due to resin shrinkage caused by molding distortion. That is, when the coating resin 3 coated on the surface of the tubular body 2 contracts after the subsequent drilling or end face treatment, a displacement occurs between the tubular body 2 and the coating resin 3, and the above-described support S When connecting as a beam or beam B, a trouble such as closing of a hole formed in the tubular body 2 will occur, but as a result, resin shrinkage is suppressed by the reinforcing rib 3x,
There is no displacement between the tubular body 2 and the coating resin 3. Therefore, it is not necessary to adhere the tubular body 2 and the coating resin 3 so as not to be displaced, and the coating resin 3 can be easily separated from the tubular body 2. It is possible to make the thickness of the coating resin 3 smaller.

On the other hand, the annual ring cap 4 is formed of a fitting portion 41 having an outer diameter capable of fitting into the inner diameter portion of the tubular body 2 and a head portion 42 having the same outer diameter as the outer diameter of the tubular body 2. It is formed of a plastic such as polyethylene, polypropylene, ABS resin, acrylic, or polyamide. Then, an annual ring cap 4 is attached to the inner diameter of the tubular body 2.
When the fitting portion 41 is fitted, the head 42 of the fitting portion 41
And further sandwiches the reinforcing rib 3x of the coating resin 3 described above with the end face of the tubular body 2.

The shape of the tubular body 2 can be any shape such as a square, an ellipse, and a triangle in addition to a circle. On the other hand, as the coating resin 3, foamed polyethylene is most suitable from the viewpoint of physical properties. . Although the reinforcing ribs 3x formed on the coating resin 3 are formed in a ring shape, they need not necessarily be engaged over the entire circumference of the end face of the tubular body 2, but are partially engaged at intervals in the circumferential direction. The reinforcing ribs 3x may be used.

In this embodiment, the tubular body 2 has a steel pipe,
Foamed polyethylene is used for the coating resin 3 and linear low-density polyethylene (LLDPE) is used for the annual ring cap 4. Next, the manufacturing apparatus 10 for such a plastic artificial wood 1 will be described.
As shown in the figure, a feeding device 11 for the tubular body 2, a heating device 12 for heating the tubular body 2 supplied by the feeding device 11, and a plastic coated on the surface of the tubular body 2 heated by the heating device 12. Extruder 13, a patterning device 14 for forming a textured texture on the coating resin 3 coated on the tubular body 2, a cooling device 15 for the patterned coating resin 3, and a device for taking off the plastic artificial wood 1 16.

The feeding device 11 is composed of a pair of feeding rolls 111, 111. The feeding rolls 111, 111 are arranged at a position for holding the tubular body 2 and rotated, so that the tubular body 2 is moved downstream. Can be sent to

The heating device 12 is provided with a heater 121 for heating the tubular body 2 prior to molding to reduce the temperature difference between the molten resin and the tubular body 2 to prevent the occurrence of resin distortion. It is.

On the other hand, the extrusion molding machine 13 is composed of a raw material input hopper 131 and a metal mold 132, and heats and pressurizes the resin input from the raw material input hopper 131 to make it flow, and continuously extrudes the resin from the metal mold 132. Thus, the resin is uniformly coated on the surface of the tubular body 2.

Further, the patterning device 14 is provided with a pair of patterning rolls 141 and 1 each of which is formed with an uneven pattern corresponding to a tree-like uneven pattern and is arranged at intervals.
42 and 5 to 1 on the wood-like uneven pattern formed on the coating resin 3 by the patterning rolls 141 and 142.
It is composed of a cold air pipe 143 for blowing cold air at 5 ° C., preferably 7 to 10 ° C., and each pair of patterning rolls 1
41 and 142 are arranged out of phase by 90 degrees, and the cold air pipe 143 is connected to a cooling device (not shown). Therefore, the upper and lower surfaces and the left and right sides which face the wood-like uneven pattern on the entire peripheral surface of the coating resin 3 coated on the surface of the tubular body 2 using the patterning rolls 141 and 142 arranged at intervals of 90 degrees, respectively. It can be formed in the order of both side surfaces. At this time, the patterning rolls 141 and 142 are cooled together with the coating resin 3 by the cool air blown out from the cool air pipe 143. In the case where a foamed plastic is used for the coating resin 3, the secondary foaming is suppressed.

The cooling device 15 is constituted by a water cooling tank 151, and water-cools the coated resin 3 on which the wood-like uneven pattern is formed.

Further, the take-off device 16 includes a pair of take-up rolls 16 similarly to the feed device 11 described above.
1, 161 and these take-up rolls 16
By disposing and rotating 1,161 at a position for holding the semi-finished plastic artificial wood, the semi-finished plastic artificial wood can be picked up. The speed of the take-off device 16 and the speed of the above-described feeding device 11 are synchronized, and the extruder 13 forms the coating resin 3 having a uniform thickness without being influenced by the propulsion pressure for extruding the resin. Like that.

When the tubular body 2 is coated with the coating resin 3 by the manufacturing apparatus 10, a pair of front and rear tubular bodies 2,
By connecting 2 using the connection joiner 5,
The plastic body 1 can be manufactured by continuously coating the tubular body 2 with the coating resin 3. As shown in FIG. 4, the connection joiner 5 can be fitted to a first outer diameter portion 51 having the same outer diameter as the outer diameter of the tubular body 2 and to the inner diameter portion of the tubular body 2 at both ends. A second outer diameter portion 52 having an outer diameter, located between the first outer diameter portion 51 and the second outer diameter portion 52, smaller than the outer diameter of the first outer diameter portion 51, and , A third outer diameter portion 53 having an outer diameter larger than the outer diameter of the second outer diameter portion 52.
3, the reinforcing ribs 3x described above are formed. That is, the third outer diameter portion 5 of the connecting joiner 5
3x reinforcement ribs 3x
And the inner diameter thereof are determined.

The inner diameter and the thickness of the reinforcing ribs 3x are set to necessary numerical values according to the outer diameter and the length of the plastic artificial wood 1, and correspond to the outer diameter and the length of the plastic artificial wood 1. It is necessary to prepare the connection joiner 5 having the third outer diameter portion 53.

Further, protrusions (not shown) having the same outer diameter as the outer diameter of the first outer diameter portion 51 are formed on the outer peripheral surface of the third outer diameter portion 53 of the connecting joiner 5 at intervals. Thus, the coating resin that has entered between the projections serves as a reinforcing rib that engages with the end face of the tubular body 2 at intervals. Thus, the above-described ring-shaped reinforcing rib 3
Instead of x, a reinforcing rib that engages at an interval in the circumferential direction of the end face of the tubular body 2 may be used.

Next, the process of manufacturing the plastic artificial wood 1 by the manufacturing apparatus 10 will be described. First, the second connecting jointer 5 is connected to the inner diameter of the pair of front and rear tubular bodies 2 and 2.
The outer diameter portions 52, 52 are fitted, and the two tubular bodies 2, 2 are connected via the connection joiner 5 (see FIG. 5).

Thereafter, the tubular body 2 is set on a transport device (not shown), and the feed rollers 111 and
Supply to 111. Hereinafter, the tubular body 2 is sent to the downstream side via the feeding device 11. The tubular body 2 sent to the downstream side is heated by the heater 121 of the heating device 12 before forming. Then, in the extruder 13, the resin in a fluid state continuously extruded from the mold 132 uniformly covers the outer surfaces of the tubular body 2 and the connecting joiner 5. Thereafter, a wood-like uneven pattern is formed on the entire peripheral surface of the coating resin 3 via the patterning rollers 141 and 142 of the patterning device 14. Next, the coating resin 3 is cooled by passing through the water cooling tank 151 of the cooling device 15. The semi-finished plastic artificial wood in which the tubular body 2 is covered with the coating resin 3 having a tree-like uneven pattern is drawn out by the drawer rolls 161 and 161 of the drawer 16 synchronized with the feeder 11.

In the semi-finished product of the plastic artificial wood that has passed through the drawing device 16, the outer surface of the tubular body 2 is coated with the coating resin 3, and the first outer diameter portion 51 and the third outer diameter portion 53 of the connecting joiner 5 are provided. Is also coated with a coating resin 3 (see FIG. 6). Then, when the semi-finished product of the plastic artificial wood passes through the drawing device 16, the covering resin 3 is connected to the connecting joiner 5 via a cutter (not shown).
, And the connecting joiner 5 is pulled out of the tubular body 2 (see FIG. 7). The connecting joiner 5 pulled out from the tubular body 2 is used repeatedly in the production of the next plastic pseudo wood 1. Next, annual ring cap 4
Is attached to both ends of the semi-finished plastic pseudo-wood (see FIG. 8). That is, the fitting portion 41 is fitted into the inner diameter portion of the tubular body 2 while the head 42 of the annual ring cap 4 is attached to the inner diameter portion of the coating resin 3, and the reinforcing ribs 3 x of the coating resin 3 are placed between the end surface of the tubular body 2. Insert so that it is clamped. After this,
An end surface treatment for cutting off unnecessary portions of the coating resin 3 protruding from the end surface of the annual ring cap 4 is performed to manufacture the plastic artificial wood 1 (see FIG. 9).

The plastic artificial wood 1 thus manufactured has a wood-skinned uneven pattern formed on the peripheral surface thereof and an annual ring pattern formed on the end surface thereof, and has an excellent appearance of a cut-out wood as a whole. . Furthermore, on the inner peripheral surface near both ends of the coating resin 3 that covers the tubular body 2, the ring-shaped reinforcing ribs 3x are engaged with both end surfaces of the tubular body 2 over the entire circumference, so that resin shrinkage is suppressed, Even after drilling, the gap between the tubular body 2 and the coating resin 3 does not occur, and when the plastic artificial wood 1 is constructed as a sidewalk fence or a vehicle protection fence, the hole position does not shift and the work on site is ensured. It can be performed.

[0031]

As described above, according to the plastic artificial wood of the present invention, the cut resin has an excellent appearance in the shape of a cut wood, and at the same time, the coating resin coating the surface of the tubular body is engaged with the end face of the tubular body. Since the reinforcing ribs are provided, resin shrinkage is suppressed, and even if a hole is formed after molding, no displacement occurs between the coating resin and the tubular body.

Further, according to the method of manufacturing a plastic pseudo-wood of the present invention, a plastic pseudo-wood having an annual ring cap at both ends can be continuously produced irrespective of the size, so that the production efficiency is remarkably improved.

Further, according to the connecting joiner used in the method of manufacturing a plastic pseudo-wood of the present invention, by connecting a pair of front and rear tubular bodies, it is possible to cope with continuous production of the plastic pseudo-wood and to cover the outer peripheral surface thereof. Reinforcing ribs that engage the end surfaces of the tubular body can be reliably formed on the coated resin.

[Brief description of the drawings]

FIG. 1 is a front view of a plastic artificial tree of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a schematic view showing an apparatus for producing a plastic artificial wood.

FIG. 4 is an explanatory view showing a step of partially omitting a process of manufacturing a plastic artificial wood according to the present invention.

FIG. 5 is an explanatory view showing a process of manufacturing a plastic artificial wood according to the present invention with a part thereof omitted.

FIG. 6 is an explanatory view showing a step of partially omitting a manufacturing process of a plastic artificial wood according to the present invention.

FIG. 7 is an explanatory view showing a step of partially omitting a manufacturing step of the plastic artificial wood of the present invention.

FIG. 8 is an explanatory view showing a step of partially omitting a process of manufacturing a plastic artificial wood according to the present invention.

FIG. 9 is an explanatory view showing a step of partially omitting a step of producing a plastic artificial wood according to the present invention.

FIG. 10 is a perspective view of a protective fence assembled by plastic artificial wood.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic artificial wood 2 Tubular body 3 Coating resin 3x Reinforcement rib 4 Annual ring cap 5 Connecting joiner 10 Manufacturing device 11 Feeding device 12 Heating device 13 Extrusion molding machine 14 Patterning device 15 Cooling device 16 Drawer device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI E02D 5/24 E02D 5/24 // B29K 105: 20 B29K 105: 20 B29L 9:00 B29L 9:00 23:00 23:00 31:10 31:10 (58) Fields investigated (Int.Cl. ⁷ , DB name) B29D 31/00 B29C 47/02 B29C 47/08 B29C 69/00 E01F 13/00 E02D 5/24

Claims (3)

(57) [Claims] 1. A tubular body, a covering resin coated on the surface of the tubular body to form a tree-like uneven pattern, and an annual ring cap attached to both ends of the tubular body. Ring-shaped reinforcing ribs that engage the entire end surface of the tubular body on the inner peripheral surface near both ends or reinforcing ribs that engage at circumferentially spaced intervals on the end surface of the tubular body are formed. Plastic false wood. 2. A pair of front and rear tubular bodies are connected via a connecting joiner, the tubular body and the connecting joiner are heated while being fed, and the surfaces thereof are coated with a resin by extrusion molding. After the coating resin is cooled, the coating resin is cooled, then the coating resin is cut off at the connection joiner portion, the connection joiner is pulled out, and further, an annual ring cap is attached to both ends of the tubular body to perform an end face treatment. A method of manufacturing plastic artificial wood. 3. A first member having the same outer diameter as the outer diameter of the tubular body.
An outer diameter portion, a second outer diameter portion located at both ends and having an outer diameter capable of fitting to the inner diameter of the tubular body, and a first outer diameter portion located between the first outer diameter portion and the second outer diameter portion; A third outer diameter portion having an outer diameter smaller than the outer diameter of the outer diameter portion and larger than the outer diameter of the second outer diameter portion, wherein the second outer diameter portion is fitted into the tubular body. When the outer surface is coated with the coating resin, a reinforcing rib that engages with the end surface of the tubular body is formed by the coating resin coated on the third outer diameter portion. Connected joiner.