JPS61123527A - Plastic pipe with reinforcing line therein - Google Patents

Abstract

PURPOSE:To obtain the title pipe that is freed from a longitudinal crack to be generated due to the flection, by embedding several or several ten axial reinforcing lines in the circumference part of a pipe in such a manner that they are juxtaposed and extended longitudinally on the pipe, and embedding one or several circumferential reinforcing lines in the form of a coil or coils around the axial reinforcing lines. CONSTITUTION:Several or several ten axial reinforcing lines are embedded in the circumferentail part of a plastic pipe in such a manner that they are juxtaposed and extend logitudinally of the pipe, and one or several circumferential reinforcing lines in the form of a coil or coils are embedded around the axial reinforcing line. Flexion of the pipe is improved due to the axial reinforcing lines, and since the circumferential reinforcing lines 2 are coiled and paced over the axial reinforcing lines 1, there is no possibility of logitudinal cracking in the pipe due to flection, and the water pressure resistance can be improved. Thermal expansion of the pipe is restricted remarkably by the axial reinforcing lines 1.

Description

[Detailed Description of the Invention] Plastic pipes have excellent corrosion resistance and are of high quality as water pipes. However, there is insufficient strength against external forces after piping, and insufficient rigidity due to large deflections in horizontal piping.
Insufficient pressure resistance during freezing.

Due to drawbacks such as excessive shrinkage or expansion due to the two-dimensional difference between piping and use, this has hindered its widespread use as water supply pipes for building construction. Therefore, the present invention aims to improve the above-mentioned drawbacks by reinforcing this plastic pipe.
Several or dozens of axial reinforcing wires are buried in one direction on the circumference inside the pipe wall, and one or several circumferential reinforcing wires are placed on the outer circumference! The purpose is to obtain a reinforced wire-filled plastic tube embedded in a coil shape in the 2'.

The plastic used is polyethylene.

Examples include PP, hard PVC, grease-resistant, etc., but impact-resistant hard PVC resin is most suitable in terms of reinforcing effect, and metal wire, glass fiber wire, etc. can be used as reinforcing wire, but if the surface is uneven or Adhesive treated iron wire and stainless steel wire are highly effective in reinforcing and are economical.

Even if ordinary iron wire is used as the axial reinforcing wire, since the cross-sectional area of the wire is small, it will take many years for corrosion to progress, and this will not pose a problem in practical use. As the circumferential reinforcing wire 2, a thin stainless steel wire is preferable, and a glass fiber wire is advantageous in terms of cutting strength.

In the present invention, a large number of axial reinforcing wires 1 parallel to the tube axis provide
Deflection is significantly improved, and since the circumferential reinforcing wire 2 is layered around the outer periphery in a coiled manner, there is no fear of vertical cracking of the pipe due to deflection, and of course, the water pressure resistance is significantly improved by the circumferential reinforcing wire 7 and 2.

In addition, thermal expansion is significantly restricted by the axial reinforcing wire 1, and can be reduced to several times that of a tube made of hard vinyl chloride resin alone.

In order to manufacture such a tube with high quality and high efficiency, the O1 punching mold 8 and the rotary reel receiver 4 that houses the reel 5 are rotated in the same direction and at the same speed while being wound around the reel 5. The several or tens of axial reinforcing wires 1 are drawn into the l extrusion mold 8 through the same number of axial reinforcing wire introduction holes 9, while the axial reinforcing wires 1
The axial reinforcing wires 1 are wrapped in molten plastic pushed through the inlet 10 of the punching die 8 and extruded to form an inner tube in which a large number of oil reinforcing wires 1 are arranged around the inner circumference of the meat. 3
form.

Next is the fixed reel receiver! 6 reels! The circumferential reinforcing layer 7 is wound into a coil by the rotation and axial movement of the inner tube 3, and is drawn into the second extrusion mold 211 as it is. On the other hand, the inner tube 3 and the circumferential reinforcing wire 2 are wrapped and integrated into a single piece by molten plastic pushed through the inlet 22 of the second extrusion mold 21, thereby producing a reinforcing plastic tube. .

In the present invention, while rotating the first extrusion die 8, the axial reinforcing wire 1 is
By extruding the person's inner tube 3 and using this rotation to wrap around the circumferential reinforcing wire 2 and slowing down or stopping the rotation of the second extrusion & die 21, leaked plastic that is about to flow out along the inner tube 3 is removed. By applying a shearing force to the inner tube 3 and kneading it, and remelting the plastic on the surface of the inner tube 3, a completely magnetic outer tube layer 26 is created.

In the present invention, instead of rotating the reel holder 5 for the axial reinforcing wire 1, the reel holder 16 for the circumferential reinforcing wire 2 is fixed and hung, so the equipment is simple, and the installation area is small, so that this manufacturing equipment can be installed in large numbers. It has the advantage of being able to operate in parallel. In addition, when a metal wire is used as the reinforcing wire 1 in the moving direction, by heating it with a preheating device 7 using high frequency heating or the like, the molten plastic in the extrusion mold 8 is completely removed;
Furthermore, by providing fine irregularities on the surface of the metal wire, the cohesive force can be further increased.

The rotary relay receiver 4 has a structure in which it can rotate in the same direction and the same direction as the first punching mold 8 by a gear 6 etc., and a large number of axial reinforcing wires 1 are wound on the reel 5 at the same time. In this case, the reel 5 may be divided and provided by the number of axial reinforcing wires I. The first extrusion die 8 is provided with a large number of introduction holes 9, through which the axial reinforcing wire 1 is drawn in while rotating. The extrusion die 8 is driven by the first extrusion screen 12, and the plasticized plastic is forced into the rotating extrusion die through the annular chamber 13° and the inlet 10.
It is extruded while rotating, enveloping a large number of axial reinforcing wires l. And base 14. After passing through the cooling device 15, it is molded into the inner tube 3.

Next, one or several circumferential reinforcing wires 2 wound around the reel 16 of the fixed reel receiver 17 are connected to the preheating device 1 by the rotation of the inner tube 3.
8 and comb teeth 19 and is wound around the outer circumference of the inner tube 3.

The lead of the coil is determined by the axial movement speed and rotational speed of the inner tube 3. Therefore, in order to reduce the distance between the circumferential reinforcing wires 2, the number of circumferential reinforcing wires 2 must be increased, or the first
The rotation speed of the extrusion die 8 is increased.

By preheating the circumferential reinforcing wire 2, it slightly bites into the surface of the inner tube 3 and its position is determined. Furthermore, it is possible to make it contact the axial reinforcing line supervisor by biting it further.

The inner tube 3 with the circumferential reinforcing wire 2 wound into a coil is drawn into the second extrusion die 21. At this time, shearing force is applied to the leaked plastic that is about to flow out along the outer surface of the inner tube 3 by rotating, decelerating, or stopping the mold. Therefore, the outer surface layer of the inner tube 3 is plasticized again, and the leaked plastic and melt are combined and drawn into the extrusion 72 521, so that the plastic forming the outer tube layer 26 is completely fused to the inner tube 3. To further enhance this fusion, the heated friction ring 20 may be rotated at high speed.

Second extrusion JJI in Figure 3! In 2+, the annular chamber 25. Although an inlet 22 and a gear 23 are provided to enable an arbitrary speed, these structures can be simplified if the mold is used stationary.

The tube coated with the tube outer layer 26 by the ``A''2 press mold 21 is extruded while rotating.Therefore, the outer diameter can be easily cut slightly by the cutting device 28,
Therefore, it is possible to obtain a reinforcing wire-filled plastic tube with extremely high outer diameter accuracy. This improvement in outer diameter accuracy strengthens the joints and adhesive bonding, which is an important requirement for high water pressure resistant pipes, as well as improving the strength of the pipe.

The reinforcing wire-containing plastic pipe is rolled and taken up by a take-up roll 30 driven by a speed reduction motor B. A tire 31 is provided on the outer frame so that the entire device can rotate in accordance with the rotation of the pipe, and rollers 32 The structure is supported by

[Brief explanation of drawings]

The figures show an example of the implementation of the present invention, in which Fig. 1 is a longitudinal cross-sectional view of a plastic tube with reinforcing wire, and Fig. 2 is a full view of the same. A vertical cross-sectional view of the equipment, AP4 is a plan view of the rotary reel receiver, Fig. 5 is a x-x parent view of Fig. 3, Fig. 6 is a Y-Y sectional view of Fig. 3, and an off view is a diagram of the inner pipe. The cross-sectional view of Figure 1-8 is a Z-Z sectional view of Figure 3. I... Oil direction reinforcement line 2... Circumferential direction reinforcement line 3...
・Inner tube 4 ・Rotating reel receiver 5 Reel 6 of the rotating reel receiver ・Gear 7 of the rotating reel receiver - Preheating device for axial reinforcing wire 8 - Extrusion mold 9 ... Axial reinforcing wire introduction hole 10
Talent! Inflow port 11 of extrusion mold Gear 12 of first extrusion mold First extrusion screw 13 ... Annular chamber of first extrusion mold 14 Mouth reel 15 Cooling device 16 ・Fixed≠p receiver 17
Reel 18 of fixed reel receiver - Preheating device 19 for circumferential reinforcing wire Comb teeth for circumferential reinforcing wire 20 Friction ring 21 Second extrusion mold 22 - Inflow port 23 of second extrusion mold Gear 24 of second extrusion mold 2nd ejecting screier 25 - 2nd iII+ annular chamber of the ejection mold 26 - tube outer layer 27 cooling device 28 cutting device 29
Reduction speed change motor 30 for taking off Taking-off roll 31 Tire for taking-off device 32 Roller guard for taking-off device 1 (2) Fig. 2

Claims (6)

[Claims] (1) Several or dozens of axial reinforcing wires 1 are buried in the pipe axial direction on the circumference inside the pipe wall, and one or several circumferential reinforcing wires 2 are coiled around the outer circumference. A plastic pipe with reinforced wire embedded in the shape. (2) While rotating the first extrusion mold 8 and the rotary reel receiver 4 that houses the reel 5 in the same direction and at the same speed, several or dozens of axial reinforcing wires 1 wound around the reel 5 are The reinforcing wire is drawn into the first extrusion mold 8 through the same number of axial reinforcing wire introduction holes 9,
On the other hand, by wrapping the axial reinforcing wires 1 with the molten plastic pushed through the inlet 10 of the first extrusion mold 8 and extruding them, a large number of axial reinforcing wires 1 are arranged around the inner circumference of the meat. Then, the inner tube 3 is formed. Next, the circumferential reinforcing wire 2 wound around the reel 17 of the fixed reel receiver 16 is wound into a coil by the rotation and axial movement of the inner tube 3, and is drawn into the second extrusion mold 21 as it is. On the other hand, the inner tube 3 and the circumferential reinforcing wire 2 are wrapped and integrated with the molten plastic pushed through the inlet 22 of the second extrusion mold 21. Method of manufacturing plastic pipes. (3) By decelerating or stopping the second extrusion die 21 with respect to the rotational speed of the inner tube 3, the molten plastic leaking from the gap between the inner surface of the second extrusion die 21 and the outer surface of the inner tube 3 is kneaded again. A method for manufacturing a reinforcing wire-containing plastic tube according to claim 2, wherein the tube outer layer 26 is fused to the surfaces of the circumferential reinforcing wire 2 and the inner tube 3. (4) The method for manufacturing a reinforcing wire-containing plastic tube according to claim 2, wherein the axial reinforcing wire 1 and the circumferential reinforcing wire 2 are preheated to strengthen the welding force with the plastic. (5) A method for producing a reinforcing wire-containing plastic tube according to claim 2, wherein fine irregularities are provided on the outer circumferential surface of the metal axial reinforcing wire 1 to strengthen the fusion bonding force with the plastic. (6) A method for manufacturing a reinforcing wire-containing plastic tube according to claim 2, wherein the rotation and axial movement of the tube are used to finish cutting the outer peripheral surface.