JP4457610B2 - De-PVC flexible hose and manufacturing method thereof - Google Patents

Description

  The present invention can be used as various hoses that require flexibility, hose that guides particles and powders, and hose that guides muddy water and food liquids. The present invention relates to a flexible hose used for guiding a body (de-PVC) and a method for manufacturing the same.

The flexible hose is not only lightweight and requires shape retention, but also preferably has flexibility. As an example, a soft resin strip made of soft vinyl chloride having a cross section with a hard reinforcing portion made of hard vinyl chloride inside, and a polysulfide rubber having an inner side and 40 to 80% sulfur. A flexible hose is formed by winding each of the rubber-made (made of EPDM) belt-like bodies in a molten state spirally around the rotating body (see, for example, Patent Document 1).
Japanese Examined Patent Publication No.59-52317

In the above Patent Document 1, since the outer peripheral wall portion is made of soft vinyl chloride having a specific gravity between 1.2 and 1.4, not only has the disadvantage that the weight increases, but also during the incineration process, There is also a disadvantage that toxic gases such as dioxins are generated.
Further, since a rubber band that is not compatible with a soft resin band made of soft vinyl chloride is melt-bonded, its adhesive force is not so strong (large). Therefore, troubles such as peeling of the outer peripheral wall portion and the inner peripheral wall portion with use occur, and there is room for improvement.

  In view of the above-mentioned situation, the present invention intends to solve the problem in that it is excellent in both flexibility and shape retention, is friendly to the environment, and further avoids troubles such as peeling well over a long period of time. It is in providing a flexible hose that can.

In order to solve the above-mentioned problem, the present invention covers a reinforcing portion that is sent out in a spiral shape and is composed mainly of a hard olefin-based resin, and an outer surface side of the reinforcing portion in close contact with the reinforcing portion. And a covering portion which is fed out in a spiral shape to bond both ends in the hose axis direction to form the outer surface of the hose, and covers the inner surface side of the reinforcing portion and the reinforcement of the inner surface of the covering portion A lining part that is in close contact with the inner surface that is not in close contact with the part, the covering part is composed mainly of a soft olefin resin, and the lining part is a soft olefin that is compatible with the covering part. A flexible hose composed mainly of a base resin or a soft olefin-based resin compatible with the coating portion and rubber, and sends out the melted lining in a strip shape, The width direction of the strip-shaped lining The melted reinforcing part is fed out over the central part to integrate both, and the end parts in the width direction of the lining part are fed out in the state of overlapping with the hose axis direction. The belt-shaped melted covering portion having a width corresponding to one pitch across two adjacent reinforcing portions is fed out, and then the covering portion positioned between the reinforcing portions adjacent in the hose axial direction is provided. By pressing with a pressing roller having an arcuate pressing surface toward the overlapping portion side of the lining portion, both ends of the lining portion in the hose axial direction are fused and bonded, and the inner surface of the lining portion is A de-PVC flexible hose having a substantially flat cross-sectional shape is formed . You may comprise the said lining part as a main component by the styrene resin compatible with the said coating | coated part.
Moreover, you may comprise the said reinforcement part with what mixed hard polyethylene and talc.
Further, the soft olefin resin may be a transparent EVA resin, and the rubber may be EPM.
In addition, the covering portion is made of a transparent EVA resin in a strip shape with a thickness of 1 mm or less, the rubber is EPM, and is formed by bridging the covering portion between the reinforcing portions adjacent in the hose axial direction. The thickness of the lining portion that is in close contact with the lowest portion of the substantially arc-shaped valley portion is set to 0.2 to 2.5 mm, and the transparent portion that can visually recognize the inside through the covering portion and the lining portion or You may comprise a translucent part.
Further, the blending ratio of the EPM and the EVA resin may be set to a weight ratio of 90:10 to 60:40 or a weight ratio of 10:90 to 40:60. As raw materials which are well mixed with the EVA resin (olefin resin) and have transparency, HSBR (hydrogenated styrene butadiene rubber), SEBC (styrene / ethylene butylene / olefin crystal block copolymer), CEBC (olefin crystal / Synthetic rubber such as ethylene butylene / olefin crystal block copolymer) may be mentioned, but natural rubber may be used in some cases .
Also, the drawing height of the extruder with respect to the winding portion is set so that the winding width when being wound down from the extruder for sending out the melted lining is smaller than the discharge width of the extruder. May be.
Moreover, you may comprise so that the hose axial direction both ends of the said reinforcement part may be wrapped around and covered with the said lining part .
In addition, the hose that is driven and rotated has a reinforcing part having a substantially circular or substantially elliptical cross section composed of hard polyethylene as a main component and a width wider than the reinforcing part, and a flat hose A belt-like lining composed mainly of transparent EVA resin and EPM, which constitutes the inner surface, is fed out in an integrated state while the reinforcing portion is fused and bonded to the substantially central portion in the width direction of the lining. The end portions of the lining portions adjacent to each other in the hose axis direction are partly overlapped with each other, and are adjacent to each other at least in the hose axis direction from above the reinforcing portion and the lining portion. It has a length in the width across between the reinforcing portion, and, tape-like covering portion having a width of transparent EVA resin at an Ri length of one pitch across two reinforcing portions adjacent in the hose axis direction In a spiral with both ends overlapped After applying come to form a substantially trough portion of the arc-shaped between reinforcing portion is pressed between the reinforcing portion adjacent hose axis direction by rollers, and, both end portions of the lining of the hose axial direction Is formed by making the thickness of the lining portion that is melt-bonded and closely adheres to the lowest portion of the valley portion smaller than the thickness of any other portion, and the transparent portion or the inside visible through the covering portion and the lining portion or A translucent part may be constructed to produce a de-PVC flexible hose.

By using olefin-based resin (including olefin-based elastomer) as the material of the hose, not only ash content is generated at the time of incineration, toxic gas is not generated, it can be easily incinerated, and materials that are conventionally used PVC (polyvinyl chloride resin) has a specific gravity of about 1.3. Compared with that, the specific gravity of olefin-based resins such as EVA resin and polyethylene is about 0.9, making it approximately 30% lighter than PVC. It is possible to provide a hose excellent in both environmental and usage aspects. In addition, by using EPM (ethylene-propylene copolymer rubber) as the rubber, as in the case of the olefin resin, the ash content is small at the time of incineration, and no toxic gas is generated, and the incineration treatment can be easily performed. In addition, compared to the case where the hose is constructed of PVC, the results of the water pressure test described later show that it is good against elongation (has an advantage that it is difficult to stretch), and is particularly advantageous in terms of durability when used for those that require water pressure. Become.
In addition, the lining portion is mainly composed of a soft olefin resin (including olefin elastomer) compatible with the coating portion, or a soft olefin resin (including olefin elastomer) compatible with the coating portion. ) And rubber as the main component, the adhesive performance with the covering part can be improved and the peeling is difficult to be made compared to the conventional one in which the lining part is made of rubber alone. This is advantageous in terms of durability. Among olefin resins, the use of EVA resin has an advantage that flexibility can be exhibited as compared with polypropylene and polyethylene.
In addition, when the lining part is composed mainly of a styrene resin (including styrene elastomer) that is compatible with the coating part, the heat resistance is improved and cracking is possible even if the hose is bent at a temperature exceeding room temperature. Not only does not enter, but also has an advantage that the transparency is high, the inner surface can be made very smooth, and a connecting tool such as a nipple can be easily inserted and the fluid can be guided smoothly.
Moreover, by comprising the said coating | coated part with a soft resin, it is easy to become familiar with a hand compared with what was comprised with hard resin, can be handled easily, and can make it a commercial value high.
Also, by integrating the lining portion and the reinforcing portion and extruding them together, the manufacturing device can be simplified and miniaturized as compared with a configuration in which the lining portion and the reinforcing portion are separately fed out to constitute a hose. In addition, there is no misalignment between the lining part and the reinforcement part, and there is no trouble such as poor adhesion due to air entrapment between the adhesive surfaces of the two parts, and more stable molding can be performed. It becomes advantageous in terms. In addition, the reinforcing portion and the lining portion are integrated and fed to the rotating body, and the tape-like covering portion is overlapped thereon to make the surface of the covering portion into a predetermined arc-shaped curved shape, thereby being flexible. However, the covering portion can be securely bonded to the reinforcing portion and the lining portion, which is advantageous in terms of manufacturing with few defective products. In addition, by forming the surface of the covering portion into a predetermined arcuate curved shape with a pressing roller, it is possible to form a flexible hose, but the thickness of the lining portion is set to a set thickness. In addition, the covering portion can be securely bonded to the lining portion without a gap. In addition, since the feeding speed of the said lining part and the feeding speed of the said reinforcement part cannot be made to correspond completely, as shown in FIG. 2, both-ends lower surfaces 4C and 4C were excluded among the lower surfaces of a lining part. The lower surface, that is, the lower surface 4B affected by the speed difference between the lining portion and the reinforcing portion becomes a rough surface as shown in FIG. However, since both ends of the lining located far from the reinforcing portion are not easily affected by the speed difference, the lower surfaces 4C and 4C at both ends become flat surfaces without unevenness and press the overlapping ends. Even if it is formed into an overlapping portion having a predetermined thickness, the lower surface 4C, 4C is a flat surface, so that the light transmittance does not decrease unlike a portion having an uneven surface. Therefore, the overlapping part can be a transparent part or a semi-transparent part, and the inside of the hose can be visually observed through the transparent part or the semi-transparent part.

  By constructing the reinforcement part with a mixture of hard (high density) polyethylene and talc, it can be made into a highly rigid hose, and even if it is stepped on by mistake, it is difficult to be crushed and has a high reliability. It can be. In addition, a pigment can be mixed with these to give a desired color. Depending on the amount of talc mixed, the ash content during incineration increases.

  When transparent EVA resin (olefin elastomer) is used as the soft olefin resin and EPM is used as the rubber, there is little ash during incineration, no toxic gas is generated, and it can be easily incinerated. In addition, the flow of fluid such as air, particles, and powder can be confirmed, and a hose with high added value that can be used conveniently can be obtained. For example, in the EVA of Shore D 40-50, it has been thought that it is unsuitable for forming a hose by winding it around a homer or the like, but a hose excellent in flexibility is manufactured by the structure of the present invention of the present application. I was able to.

  By configuring a transparent or semi-transparent part that allows the inside to be visually recognized through the covering part and the lining part, the flow of fluid such as air, particles, and powder can be confirmed through the transparent part or the semi-transparent part. It can be a hose with high added value that can be used conveniently.

  By setting the blending ratio of EPM and EVA resin (olefin elastomer) to a weight ratio of 90:10 to 60:40 or a weight ratio of 10:90 to 40:60, internal air, granules and powder The transparency of the fluid can be confirmed so that the flow of the fluid can be confirmed, and the transparency can be adjusted according to the purpose.

  Transparency is improved by setting the drawing height of the extruder with respect to the wrapping part so that the winding width when wrapping from the extruder for sending out the melted lining is smaller than the discharge width of the extruder It is possible to make the hose easy to visually recognize the inside while using the same material.

  By covering the both ends of the reinforcing portion in the hose axis direction with the lining portion and covering the lining portion so that the inner surface of the lining portion is substantially flat, the bonding area between the lining portion and the reinforcing portion In addition to increasing the adhesion between the two, the hose can be made into a hose with low flow resistance, and it can reliably prevent troubles such as peeling due to poor adhesion while guiding the fluid. It can be optimized as a hose.

  1 (a) and 1 (b) show a flexible hose (hereinafter simply referred to as a hose) 1 for guiding a liquid for food such as muddy water or juice, a granule or powder, and the like. The arc-shaped convex portion 1A and the arc-shaped concave portion 1B are alternately formed in a spiral shape, but the shape of the convex portion 1A and the concave portion 1B is limited to the shape shown in the figure. It is not a thing. The hose 1 is a hose that can be used particularly effectively when it is lightweight and requires shape retention and flexibility.

  The hose 1 is manufactured by a hose forming apparatus shown in FIG. 3, and the hose forming apparatus has a homer 2 that is a driving rotating body that is driven to rotate in the direction of an arrow A in the figure, and the homer 2 has a substantially cross-sectional shape. A state in which the reinforcing portion 3 having an elliptical shape (which may be a circle, a triangle, or a rectangle) is integrated with the lining portion 4 that is wider than the reinforcing portion 3 and is thinner toward both ends in the hose axial direction. Extruder 5 that extrudes in the former, and a reinforcing portion that is wound around the homer 2 in a spiral shape and that is adjacent to each other in the hose axis direction and welded to each other in a cylindrical shape. And an extruder 7 for extruding a tape-shaped covering portion 6 having a length (width) extending between three and three. The lower portion of the reinforcing portion 3 is embedded from the upper surface side in the substantially central portion of the lining portion 4 in the hose axis direction. In other words, a part of the lining portion 4 is formed at the corner portions 3B and 3B on both end sides of the reinforcing portion 3. By being configured to wrap around and filled, it is possible to increase the adhesion area between the two compared to the configuration in which only the bottom surface 3C of the reinforcing portion 3 is covered with the lining portion 4. ing. Therefore, the hose body in which the reinforcing portion 3 and the lining portion 4 are integrated with the homer 2 is pushed out in a direction intersecting the hose axis direction by the extruder 5 so as to be spirally wound around the homer 2 and indicated by an arrow B in the figure. The outer surface of the reinforcing portion 3 and the lining portion 4 are moved in the direction, and the outer surface of the reinforcing portion 3 and the lining portion 4 has a predetermined width (here, the length corresponding to one pitch over two reinforcing portions 3 and 3 adjacent in the hose axial direction). A surface that presses the covering portion 6 that is located between the reinforcing portions 3 and 3 and constitutes the outer surface of the hose from above. By pressing with a substantially circular arc-shaped pressing roller 8, the cross-sectional shape is a hose shaft core while melting and bonding both ends in the hose shaft direction as shown in FIGS. Cover portion 6 projecting in a substantially arc shape toward the hose center) Form, the substantially flat inner surface of the lining 4, and so that it is possible to cross-sectional shape constitutes a generally circular hose.

  The reinforcing part 3 is mainly composed of hard polyethylene (or other material such as hard polypropylene as long as it is a hard olefin resin), and talc (not required) for increasing the shape retention strength. And a coloring pigment (which may be omitted), and is adhered to the inner surface of the covering portion 6 and the upper surface 3A has an arcuate upper surface 3A and the hose shaft side is moderately positioned. A curved bottom surface (surface on the side constituting the inner surface of the hose) 3C, and a curved corner portion 3B, 3B of less than 90 degrees connecting the upper surface 3A and the bottom surface 3C at both ends in the hose axial direction. Although it has an elliptical shape, as shown in FIG. 8, the top surface (top) 3A has a circular shape only in an arc shape, or the top surface 3A and the bottom surface 3C are flat as shown in FIG. The bottom surface 3C is wider than the top surface 3A. Or it may be that trapezoidal. The reinforcing part 3 may be circular, and the shape of the reinforcing part 3 can be freely changed. 8 and 9, the corner portions 3B and 3B are the same as those in FIGS. 1A and 1B except that the corner portions 3B and 3B are configured with pointed tips. The reinforcing part 3 is 100% by weight as a whole, 82.0% by weight of hard polyethylene, 17.5% by weight of talc, and 0.5% by weight of pigment (optional). The blending ratio of hard polyethylene and talc may be set to a weight ratio of 90:10 to 70:30, and the blending ratio of hard polyethylene and talc can be freely changed.

  The covering portion 6 is formed of only a transparent EVA resin (ethylene-vinyl acetate copolymer) which is a strip-like and soft resin with a wall thickness of 0.2 mm or more and 1 mm or less. By using this EVA resin, Although it is preferable in terms of flexibility, any resin may be used as long as it is a soft resin of an olefin resin such as polypropylene or polyethylene. Here, there is an advantage that troubles such as poor adhesion due to the adhesive do not occur by melting and bonding to the covering portion 6, the reinforcing portion 3 and the lining portion 4.

  The lining 4 is prepared by mixing an EVA resin and an EPM (ethylene-propylene copolymer rubber) compatible with the EVA resin in a composition described later and actually using a mixture of a weathering agent. Not only does the transparency not decrease, but also the adhesion performance between the two can be improved. The lining portion 4 is configured to cover the inner surface side of the reinforcing portion 3 and to be in close contact with the inner surface of the inner surface of the covering portion 6 that is not in close contact with the reinforcing portion 3. It does not occur. In the specific blending, 3% by weight of a weathering agent is mixed with 70% by weight of EPM and 30% by weight of EVA resin. In other words, the total is 100% by weight, for example, EPM is 68% by weight, EVA resin is 29.1% by weight, and weathering agent is 2.9% by weight, but other blends may be used. Moreover, it is preferable to make the lining portion 4 as thin as possible. For example, as shown in FIG. 1B, the maximum thickness portion D3 is 0.6 mm to 2.0 mm, and the minimum thickness portion D2 is, for example. Is preferably set to 0.2 mm to 0.8 mm. It is preferable to use a soft material having a hardness of about 55 to 65 as defined by JIS K 6253A.

The hose 1 of the present invention shown in FIG. 1 and the hose 11 of the comparative example shown in FIG. 14 are each prototyped in four types having different diameters, and the hose is based on a water pressure test of products classified as industrial products. The measurement of the elongation rate was performed, and the measurement results are shown as graphs in FIGS. The hose 11 shown in FIG. 14 is a state in which a reinforcing portion 31 having a circular cross-sectional shape made of hard polyvinyl chloride resin (PVC) is embedded in a hose body 41 made of soft polyvinyl chloride resin (PVC). is there. In the water pressure test, the hose length is set to 1300 mm to 1500 mm, the central 800 mm is set between ratings (measurement interval), and the pressure of water supplied into the hose is gradually increased using a pressure pump. After holding for about 1 minute, the length of the hose between the scores was measured, the elongation was calculated by the following formula, and a graph was created.
Elongation rate (%) = (between scores when pressed-between original scores) / between original scores x 100
The EVA resin used for the hose 1 has a hardness of D46 defined by JIS K 6253D, and the soft polyvinyl chloride resin used for the hose 11 of the comparative example is defined by JIS K 6253A. The hardness is 60 ± 5A.

In FIG. 4, the outer diameter of the hose of the present invention is 48.3 mm to 48.4 mm, the inner diameter is 39.0 mm to 39.3 mm, the pitch P1 between the reinforcing portions 3 and 3 is 11 mm, and the lining portion 4 The thickness D2 is 0.36 mm, the thickness D1 of the covering portion 6 is 0.52 mm, the height H1 of the reinforcing portion 3 is 3.1 mm, and the width W1 of the reinforcing portion 3 is 5.65 mm to 5.75 mm per 1 m. The weight of the hose is 372 to 377 g.
14, the outer diameter is 44.6 mm, the inner diameter is 38.0 mm, the pitch P2 between the reinforcing portions 31 and 31 is 9.0 mm, the thickness D4 of the hose body 41 is 1.2 mm, The height H2 and the width W2 of the reinforcing part 31 are 3.1 mm, and the weight of the hose per 1 m is 370 g.

5, in the hose of the present invention, the outer diameter is 60.3 mm to 60.4 mm, the inner diameter is 50.2 mm to 50.3 mm, the pitch P1 between the reinforcing portions 3 and 3 is 11 mm, and the lining portion 4 is The thickness D2 is 0.28 mm, the thickness D1 of the covering portion 6 is 0.55 mm, the height H1 of the reinforcing portion 3 is 3.35 mm, the width W1 of the reinforcing portion 3 is 5.8 mm, and the hose weight per meter is 519 to 524 g.
14, the outer diameter dimension is 58.0 mm, the inner diameter dimension is 50.8 mm, the pitch P2 between the reinforcing portions 31 and 31 is 10.0 mm, the thickness D4 of the hose body 41 is 1.4 mm, The height H2 and the width W2 of the reinforcing part 31 are 3.3 mm, and the weight of the hose per meter is 520 g.

In FIG. 6, the hose of the present invention has an outer diameter of 90.3 mm to 90.6 mm, an inner diameter of 76.0 mm to 76.4 mm, a pitch P1 between the reinforcing portions 3 and 3 of 17.5 mm, and a lining portion. 4 is 0.58 mm, the thickness D1 of the covering portion 6 is 0.80 mm, the height H1 of the reinforcing portion 3 is 5.2 mm, the width W1 of the reinforcing portion 3 is 7.05 mm, and the hose per 1 m The weight is 1040.0 g.
14, the outer diameter is 86.5 mm, the inner diameter is 76.2 mm, the pitch P2 between the reinforcing portions 31 and 31 is 15.1 mm, the wall thickness D4 of the hose body 41 is 2.0 mm, The height H2 and width W2 of the reinforcing part 31 are 4.7 mm, and the weight of the hose per 1 m is 1120 g.

In FIG. 7, the outer diameter of the hose of the present invention is 117.6 mm to 118.6 mm, the inner diameter is 101.0 mm to 101.7 mm, the pitch P1 between the reinforcing portions 3 and 3 is 16.8 mm, and the lining portion 4 is 0.56 mm, the thickness D1 of the covering portion 6 is 0.86 mm, the height H1 of the reinforcing portion 3 is 6.35 mm, the width W1 of the reinforcing portion 3 is 8.8 mm, and the hose per 1 m The weight is 1850.0 g. Note that D5 shown in FIG. 1B is the thickness of the lining portion 4 between the bottom surface 3C of the reinforcing portion 3 and the hose inner surface 1C, and is substantially the same as the thickness D2 of the lining portion 4. I am doing so.
14, the outer diameter is 115.0 mm, the inner diameter is 101.6 mm, the pitch P2 between the reinforcing portions 31 and 31 is 16.4 mm, the wall thickness D4 of the hose body 41 is 2.7 mm, The height H2 and the width W2 of the reinforcement part 31 are 6.2 mm, and the weight of the hose per meter is 1800.0 g.

  4 to 7, all the graphs have the same result. That is, the result of the hose 1 of the present invention is S1, and the result of the hose 11 of the comparative example of FIG. 14 is S2. In each case, the difference in the elongation increases as the maximum water pressure is applied. The results show that the hose of the present invention is not easily stretched, and the hose 1 having the configuration of the present invention is better in terms of elongation than the hose 11 of the comparative example of FIG.

  Table 1 shows the results of visual evaluation of the transparency of the tape material produced by changing the blending of EPM and EVA constituting the lining portion 4 and producing a single tape material. The evaluation of transparency is a five-step evaluation of ◎, ○, ▲, Δ, and ×, and ◎ clearly shows the other side and is very transparent. ○ is transparent enough to see the other side. ▲ is a little cloudy and semi-transparent with the other side half visible. Δ is in a cloudy state and the other side is not visible but difficult to see. X is white and the other side is not visible. Further, EPM having a surface hardness of HDA57 is used, and EVA having a surface hardness of HDD46 and a vinyl acetate content of 15% is used. The hardness in Table 1 is the surface hardness of the finished tape material.

  As is apparent from Table 1, when EPM and EVA were blended as described above, the tape was removed in a blend excluding a 50:50 weight ratio, that is, a 90:10 to 60:40 weight ratio. When the thickness is set to 0.5 to 2.5 mm, it is not completely invisible and can maintain transparency so that the internal fluid or powder can be visually observed, but 1.5 mm or less. When the thickness is made 2.5 mm, the transparency is improved as compared with the case where the thickness is 2.5 mm, and when the thickness is 1.0 mm or less, the transparency is further improved. In the experiment, the experiment was not performed when the blending ratio of EPM and EVA was set to a weight ratio of 10: 9 to 40:60. However, when two kinds of resins were mixed, the same results as in Table 1 were obtained. Since this is presumed, the experiment was omitted.

  FIG. 1B shows a case where the maximum thickness D3 of the lining portion 4 is 2.5 mm or less. Although the inside of the hose can be visually recognized through the recess 1B of the hose 1, the lining portion 4 and the feeding speed of the reinforcing portion 3 cannot be made to coincide completely. Therefore, as shown in FIG. 2, the lower surface of the lining portion 4 except the lower end surfaces 4C and 4C, that is, the inner surface The lower surface 4B affected by the speed difference between the tension part 4 and the reinforcing part 3 becomes a rough uneven surface as shown in FIG. For this reason, the light incident on the uneven surface 4B is diffusely reflected, and the inside of the hose cannot be visually recognized. However, since both end portions of the lining portion 4 located far from the reinforcing portion 3 are not easily affected by the speed difference, the lower surfaces 4C and 4C at both ends become flat surfaces without unevenness, and the overlapping end portions 3 is pressed by the pressing roller 8 shown in FIG. 3 to form the overlapping portion 4H having a predetermined thickness as shown in FIG. 1B, the lower surfaces 4C and 4C are flat surfaces. The light transmittance does not decrease unlike the portion provided with the surface 4B. Therefore, the overlapping portion 4H can be a transparent portion (or a translucent portion), and the inside of the hose can be visually observed through the transparent portion. When the reinforced portion 3 is placed on the upper surface of the lining portion 4 after the lining portion 4 is wound around the homer 2, the covering portion 6 positioned between the reinforcing portions 3 and 3 and The inside of the hose can be visually recognized over the entire area of the lining portion 4.

  As shown in FIG. 3, the winding width F <b> 2 when being wound down from the lining portion extruder 5 for feeding out the molten lining portion 4 is the discharge width of the extruder 5 (the discharge port of the mold). Transparency is improved by setting the withdrawal height of the extruder 5 with respect to the homer 2 which is the winding portion so as to be smaller than (width) F1. Further, the lining portion 4 and the reinforcing portion 3 are integrally extruded, and a winding width F4 when being wound by being pulled down from the covering portion extruder 5 for feeding the molten covering portion 6 from above is provided. The state in which a tensile force is applied by setting the pull-out height of the extruder 5 with respect to the homer 2 as the winding portion so as to be smaller than the discharge width (lateral width of the discharge port of the mold) F3 of the extruder 5 Therefore, the hose can be pressed against the upper surface of the reinforcing portion 3 (bite in), so that the melt adhesive strength of the both can be increased and the both can hardly be peeled off.

10-13, the hose of the same shape as the four types of hose of the present invention shown in FIGS. 4-7, and the lining 4 of the hose is made of a transparent styrene-based elastomer (specifically, , S.E.B.S (Hydrogenated SBS) type elastomer), and the other part is made of the same material as the above-mentioned material, and the same measurement as described above is performed. The result is graphed as S1 and the result of the hose 11 of the comparative example of FIG. 14 is shown as a graph together with S2. In the case where the lining portion 4 is made of the styrene-based elastomer, since the transparency is higher than that of the EPM and EVA, the inside of the hose can be visually recognized at any part of the hose. It can be configured as possible.
Also in this case, as described above, in each case, the difference in elongation between the two increases as the maximum water pressure is applied, indicating that the hose of the present invention is difficult to stretch. Compared with the hose 11 of the comparative example of FIG. 14, it can be said that it is good in elongation and advantageous in durability. Since the styrene elastomer has high transparency, it is easy to check the flow of fluid and is suitable for use in the medical and food fields. In addition, the inner surface is very smooth, and it is easy to insert a connection tool such as a nipple, and there is an advantage that the fluid can be guided smoothly.

  The flexible hose of the present invention is effective when confirming internal fluids such as medical treatments and foods, as well as for guiding drainage such as granules, powder or muddy water, and also when guiding gas. Can also be applied. As the material of the covering portion 6, in addition to EVA resin (also referred to as olefin elastomer), soft polyethylene, soft polypropylene, styrene elastomer, and the like can be used. Further, as the material of the lining portion 4, in addition to EVA resin (also referred to as olefin elastomer) and styrene elastomer, soft polyethylene, soft polypropylene, synthetic rubber and the like can be used.

(A) is the side view which made a part of hose the cross section, (b) is the end view which shows the upper part of a hose. It is sectional drawing of the principal part which shows the state by which the lining part and the reinforcement part were integrated and extruded. It is the side view which made the cross section the part which shows the state which manufactures the hose with a hose shaping | molding apparatus. It is a graph which shows the expansion | extension rate with respect to the water pressure of two types of hoses with an internal diameter dimension of about 38 mm. It is a graph which shows the expansion | extension rate with respect to the water pressure of two types of hoses with an internal diameter dimension of about 50 mm. It is a graph which shows the expansion | extension rate with respect to the water pressure of two types of hoses with an internal diameter dimension of about 75 mm. It is a graph which shows the expansion | extension rate with respect to the water pressure of two types of hoses with an internal diameter dimension of about 100 mm. It is an end view which shows the upper part of the 1st hose from which the cross-sectional shape of a reinforcement part differs. It is an end view which shows the upper part of the 2nd hose from which the cross-sectional shape of a reinforcement part differs. It is a graph which shows the expansion | extension rate with respect to the water pressure of the hose of this invention which made the inner diameter dimension into about 38 mm, and made the lining part into the styrene-type elastomer, and the hose of a comparative example. It is a graph which shows the expansion | extension rate with respect to the water pressure of the hose of this invention which made inner diameter dimension about 50 mm, and made the lining part into the styrene-type elastomer and the hose of a comparative example. It is a graph which shows the expansion | extension rate with respect to the water pressure of the hose of this invention which made the internal diameter dimension into about 75 mm, and made the lining part into the styrene-type elastomer and the hose of a comparative example. It is a graph which shows the expansion | extension rate with respect to the water pressure of the hose of this invention which made the inner diameter dimension about 100 mm, and made the lining part into the styrene-type elastomer and the hose of a comparative example. It is an end view which shows the upper part of the hose of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hose 1A Convex part 1C Hose inner surface 1B Recessed part 2 Homer 3 Reinforcement part 3A Upper surface 3B Corner part 3C Bottom face 4 Lining part 4B Uneven surface 4C Lower surface 4H Overlapping part 5 Extruder 6 Covering part 7 Extruder 8 Pressing roller 11 Hose 31 Reinforcement Portion 41 Hose body D1, D2 Thickness D3 Maximum portion D4 Thickness F2, F4 Width H1, H2 Height P1, P2 Pitch W1, W2 Width

Claims (9)

A reinforcing part that is sent out in a spiral shape and is composed mainly of a hard olefin-based resin, and covers the outer surface side of this reinforcing part in close contact with it, and is sent out in a spiral shape in the hose axis direction. A covering portion that adheres both ends to form the outer surface of the hose, and a lining that covers the inner surface side of the reinforcing portion and adheres to the inner surface of the covering portion that is not in close contact with the reinforcing portion And the covering portion is composed mainly of a soft olefin resin, and the lining portion is composed mainly of a soft olefin resin compatible with the covering portion, or the covering portion. A flexible hose composed mainly of a compatible soft olefin resin and rubber, which sends out the melted lining in a strip shape, and is substantially in the center in the width direction of the strip lining The reinforcing part in the molten state on Sending out and integrating both, and sending out in the state where the widthwise ends of the lining overlap in the hose axis direction, and from that, one pitch part over two adjacent reinforcing parts in the hose axis direction The belt-shaped melted covering portion having a width of the length is fed out, and then the covering portion located between the reinforcing portions adjacent in the hose axial direction is formed in an arc shape toward the overlapping portion side of the lining portion. By pressing with a pressing roller having a pressing surface, both ends of the lining portion in the hose axial direction are melt bonded together, and the inner surface of the lining portion is substantially flat and the cross-sectional shape is formed in a substantially circular shape. de PVC flexible hose characterized by comprising. The de-PVC flexible hose according to claim 1, wherein the lining portion is composed mainly of a styrene resin compatible with the covering portion.   The de-PVC flexible hose according to claim 1 or 2, wherein the reinforcing portion is a mixture of hard polyethylene and talc.   The de-PVC flexible hose according to claim 1, wherein the soft olefin resin is a transparent EVA resin and the rubber is EPM.   The covering portion is made of a strip-like transparent EVA resin having a thickness of 1 mm or less, the rubber is EPM, and is formed by bridging the covering portion between the reinforcing portions adjacent in the hose axial direction. The thickness of the lining portion that is in close contact with the lowest portion of the substantially arc-shaped valley portion is set to 0.2 to 2.5 mm, and the transparent portion or the semi-transparent portion can be visually recognized through the covering portion and the lining portion. The de-PVC flexible hose according to claim 1, comprising a part.   The de-PVC flexible hose according to claim 5, wherein a blending ratio of the EPM and the EVA resin is set to a weight ratio of 90:10 to 60:40 or a weight ratio of 10:90 to 40:60. The drawing height of the extruder with respect to the winding portion is set so that the winding width when being wound down from the extruder for feeding out the melted lining is smaller than the discharge width of the extruder The de-PVC flexible hose according to any one of claims 1 to 6 . The de-PVC flexible hose according to any one of claims 1 to 7, wherein both ends of the reinforcing portion in the hose axis direction are covered by the lining portion and covered . A rotating body that is driven and rotated has a reinforcing part having a substantially circular or substantially elliptical cross section composed of hard polyethylene as a main component, a width wider than the reinforcing part, and a flat hose inner surface. A belt-shaped lining composed mainly of a transparent EVA resin and EPM is sent and spirally fed in a state where the reinforcing portion is integrated while being melt bonded to the substantially central portion in the width direction of the lining. The reinforcing portions adjacent to each other at least in the hose axial direction from above the reinforcing portion and the lining portion, which are fed in a state where the ends of the lining portions adjacent in the hose axial direction are partially overlapped. It has a length in the width across between and across the tape-shaped cover portion having a length in the width of one pitch across two reinforcing portions adjacent in Ri such a transparent EVA resin hose axis direction Wound spirally with the parts overlapping After digits, to form a substantially trough portion of the arc-shaped between reinforcing portion is pressed between the reinforcing portion adjacent hose axis direction by rollers, and, both end portions of the lining of the hose axial direction is melted bonding the thickness of the lining part in close contact with the lowest portion of the valley portion formed thinner than the other thickness of any site, transparent portions visible inside through the coating unit and lining unit or translucent The manufacturing method of the de-PVC flexible hose which comprises a part.

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