JP5070526B2 - Multilayer pressure hose - Google Patents

Description

The present invention relates to a multi-layer pressure-resistant hose excellent in shape retention used for multiple purposes such as a high-pressure air hose.
Specifically, the present invention relates to a multilayer pressure-resistant hose in which monofilaments (monofilaments) or the like are intersected with each other as a plurality of reinforcing yarns between an inner layer and an outer layer and wound spirally.

  Conventionally, as a multilayer pressure-resistant hose of this type, a monofilament is wound around the outer periphery of an inner resin layer produced by an extrusion device as a reinforcing thread in a mesh, and then the outer resin layer is used in the same extrusion device. As a result, the monofilament is interposed between the resin layer on the inner layer side and the resin layer on the outer layer side, and the portions where the resin layer on the inner layer side and the resin layer on the outer layer side are in contact with each other. Since it melt | dissolves and adhere | attaches, there exists what fixed the mesh-like monofilament so that it became immovable and was not displaced (for example, refer patent document 1).

JP 2006-194347 A (page 3-4, FIG. 2)

However, in such a conventional multi-layer pressure-resistant hose, the monofilaments overlap each other at the mesh intersections and the monofilaments have high rigidity, so they hardly collapse and deform even if they overlap. The thickness of the hose is thicker than that of the other parts, and the protrusions are partially protruded, thereby causing unevenness on the entire surface of the hose.
In order to connect the end of such a hose, when the outer periphery thereof is tightened with a hose band or the like, it cannot be tightened evenly over the entire circumference in the circumferential direction due to the unevenness of the hose surface. There has been a problem that fluid leakage in the pipe is likely to occur.
Furthermore, since the outer surface of a monofilament is generally formed smoothly in the axial direction by extrusion, when the other monofilament is overlapped and wound on one monofilament, the surfaces of these monofilaments slip when wound. There is also a problem that the portion where the pitch is easily misaligned and the pitch is widened by this misalignment is low in pressure resistance as a hose and easily ruptures.
In addition, since the intersecting portions of the monofilaments are in point contact with each other without being deformed, when the outer layer 2 is laminated, air easily gets caught in these intersecting portions, and bubbles remain in the reinforcing layer, thereby Not only is the adhesive strength of the outer layer weakened and it becomes easy to peel, but when both the inner layer and the outer layer are made of a transparent or translucent material, irregularly remaining bubbles noticeably reduce the commercial value significantly. There was also.

The first invention of the present invention aims to provide a multilayer pressure-resistant hose that can prevent positional displacement at the time of winding a reinforcing yarn while making the hose surface substantially smooth and that is excellent in shape retention. .
In addition to the object of the first invention, the second invention aims to prevent bubbles from remaining in the reinforcing layer.

In order to achieve the object described above, a first invention of the present invention is a multilayer pressure-resistant hose in which a plurality of reinforcing yarns are wound between each other between an inner layer and an outer layer in a spiral shape, and the reinforcing yarns The multifilament is spirally wound along the outer peripheral surface of the inner layer, and the monofilament is spirally wound around the outer side of the multifilament so as to intersect in a mesh shape . At these intersecting portions, the multifilament has a recess due to the tension of the monofilament. The monofilament is engaged with the concave portion, and a reinforcing layer made of the multifilament and the monofilament is formed between the inner layer and the outer layer .
According to a second aspect of the present invention, a configuration in which the multifilament is deformed at the intersecting portion so as to bite into the outer peripheral surface of the inner layer is added to the configuration of the first aspect.
According to a third aspect of the invention, the multifilament is wound in a spiral shape with appropriate tension along the outer peripheral surface of the inner layer in the configuration of the first invention or the second invention, and the multifilament is wound on the outer periphery of the inner layer. It is characterized in that a configuration in which it is arranged so as to bite into the outer peripheral surface while being deformed along the surface is added.

The first invention of the present invention is a monofilament and a multifilament in which a multifilament is wound spirally along the outer peripheral surface of the inner layer as a reinforcing yarn, and the monofilament is wound spirally around the outer periphery and crossed in a mesh shape. Since the multifilament, which is a single thread gathering many thin fibers at the intersection, becomes flat and forms a recess in the axial direction, the thickness dimension of each intersection decreases accordingly. At the same time, the monofilament is engaged with the concave portion of the multifilament.
Therefore, it is possible to provide a multi-layer pressure-resistant hose that can prevent the positional deviation at the time of winding the reinforcing yarn while making the hose surface substantially smooth, and has excellent shape retention.
As a result, compared to the conventional one in which the monofilaments are point-contacted with each other at the crossing portion of the mesh and the ends of the hose are connected, even if the outer periphery is tightened with a hose band, etc. It can be tightened evenly, and fluid leakage in the pipe can be completely prevented.
Furthermore, when the other monofilament is overlapped on one monofilament and wound, the surfaces can slip and the pitch can be made even compared to the conventional one where the pitch tends to shift, and the pressure resistance is partially Can be prevented from decreasing.

In the second invention, in addition to the effects of the first invention, the multifilament is deformed at the crossing portion and bites into the outer peripheral surface of the inner layer and closely adheres to it, and the upper thread is attached to the flat portion of the multifilament. Therefore, when the outer layer is laminated on the monofilament, it is difficult for air to be caught at the intersection of the multifilament and the monofilament.
Therefore, it is possible to prevent bubbles from remaining in the reinforcing layer.
As a result, it is possible to reliably prevent the inner layer and the outer layer from peeling due to bubbles remaining in the reinforcing layer, and the inner layer and the outer layer are both transparent or semi-solid, compared to the conventional one in which the intersections of the monofilaments are in point contact without deformation. Even if it is made of a transparent material, bubbles are not noticeable and the commercial value can be maintained high.

  As shown in FIGS. 1 to 3, an embodiment of the multilayer pressure-resistant hose A of the present invention includes a monofilament 3 a as a reinforcing yarn 3 between an inner layer 1 and an outer layer 2 made of a flexible material such as synthetic resin or rubber. A reinforcing layer 3 ′ is formed between the inner layer 1 and the outer layer 2 by winding the multifilament 3 b spirally and intersecting in a mesh shape.

The monofilament 3a is a single fiber in which synthetic fibers such as PET (polyethylen terephthalate) and natural fibers are thick and continuous. The monofilament 3a extends along the outer peripheral surface 1a of the inner layer 1 from the outside of the multifilament 3b described later. Alternatively, the hose A is hardly crushed by its rigidity by appropriately spiraling inside with appropriate tension, and the shape retention performance is improved.
The monofilament 3a includes a stretched monofilament.

  The multifilament 3b is made of, for example, polyester such as PET, nylon, aramid fiber, or a thin monofilament, which is twisted into a single thread, and is appropriately tensioned between the outer peripheral surface 1a of the inner layer 1 and the monofilament 3a. It is preferable to wind.

  In the arrangement example of these monofilaments 3a and multifilaments 3b, only one of them is used as a lower thread, a plurality of them are wound spirally around the outer peripheral surface 1a of the inner layer 1 at an appropriate pitch, and the other thread is wound on the outside. Are wound in a spiral in the opposite direction at an appropriate pitch.

  Further, while making the winding angles of the monofilament 3a and the multifilament 3b substantially equal, the crossing angle is set to a theoretical static angle (109.5 degrees) at which the axial strength and the circumferential strength are equal, or an angle close thereto. Therefore, it is preferable that the pressure resistance is most excellent.

  As other examples, both monofilaments 3a and multifilaments 3b are alternately wound in the spiral direction along the outer peripheral surface 1a of the inner layer 1 alternately in the same spiral direction, respectively, at appropriate pitches, respectively, Furthermore, it is also possible to wind the same combination on the outside or only the multifilament 3b as an upper thread in different spiral directions at an appropriate pitch.

  As an example of winding the monofilament 3a and the multifilament 3b, the lower yarn and the upper yarn may be wound in any manner as long as the lower yarn and the upper yarn intersect. However, both the lower yarn and the upper yarn are arranged at equal intervals in the circumferential direction. Is preferably wound so as to be inclined at a predetermined angle with respect to the axis.

Further, after the monofilament 3a and the multifilament 3b are wound, the intersection 3c can be bonded.
As a specific example, an outer peripheral surface of one or both of the monofilament 3a and the multifilament 3b is coated with an adhesive layer having a melting point lower than that of the core material, and the adhesive layer is thermally melted. The intersection 3c may be fused.

Further, if necessary, an innermost layer (not shown) made of a material that has good compatibility with the material of the inner layer 1 and is suitable for the fluid passing through the inner layer 1 is laminated by coextrusion molding or the like. Alternatively, an outermost layer (not shown) made of a material having good compatibility with the material of the outer layer 3 and suitable for the arrangement environment can be laminated outside the outer layer 3 by coextrusion molding or the like.
Embodiments of the present invention will be described below with reference to the drawings.

  In the first embodiment, as shown in FIG. 1, a plurality of multifilaments 3b are respectively wound spirally between the inner layer 1 and the outer layer 2 as lower yarns, and a plurality of monofilaments 3a are used as upper yarns on the outside thereof. Each of them is wound in a reverse spiral shape, and shows a case where these are crossed in a mesh shape.

  In the case of the illustrated example, the inner layer 1 and the outer layer 2 are made of a flexible synthetic resin such as transparent or translucent vinyl chloride, polyolefin resin, styrene resin, fluororesin or the like whose main component is excellent in flexibility or silicone rubber. However, as another example, it may be formed of an opaque soft synthetic resin or rubber.

Next, the manufacturing method and effect of such a multilayer pressure | voltage resistant hose A are demonstrated.
First, after the inner layer 1 is extruded by an extrusion molding device (not shown), the lower filament multifilament 3b is spirally wound with appropriate tension along the outer peripheral surface 1a. While deforming along the outer peripheral surface 1a, it bites into the outer peripheral surface 1a.

  Subsequently, when the upper filament monofilament 3a is wound around the outer side of the multifilament 3b in an opposite spiral with appropriate tension, the lower filament multifilament 3b and the upper filament monofilament 3a intersect in a mesh pattern.

  At these intersecting portions 3c, due to the tension of the monofilament 3a of the upper thread, the multifilament 3b, which is a single thread gathered by a number of thin fibers, is crushed and flattened to form a recess in the axial direction. Accordingly, the thickness of each intersecting portion 3c is reduced, and the monofilament 3a is engaged with an axial recess formed by the flattened portion of the multifilament 3b.

  Thereby, the thickness dimension of each intersecting portion 3c does not become extremely thick compared with the thickness dimension of the portion where the other monofilament 3a is wound, and the thickness dimension of the entire reinforcing yarn 3 including each intersecting portion 3c is averaged. At the same time, it is possible to prevent positional displacement when the upper thread is wound.

  Then, when the outer layer 2 is extruded and laminated on the outer side of the multifilament 3b and the monofilament 3a intersecting in a net-like manner in this way, a reinforcing layer 3 'composed of the multifilament 3b and the monofilament 3a is formed between the inner layer 1 and the outer layer 2. And since the thickness dimension of this reinforcement layer 3 'whole is averaged, the hose surface can be made substantially smooth.

  Further, in the reticulated space portion of the multifilament 3b and the monofilament 3a, the inner layer 1 and the outer layer 2 are mutually mixed and bonded, so that the reticulated multifilament 3b and the monofilament 3a are immovable and fixed. No misalignment.

  The lower filament multifilament 3b is partially deformed into the outer circumferential surface 1a while being deformed along the outer circumferential surface 1a of the inner layer 1, and the upper filament monofilament 3a is in contact with the collapsed portion of the multifilament 3b. Therefore, when the outer layer 2 is laminated, it is difficult to entrain air in the intersection 3c between the multifilament 3b and the monofilament 3a, and no bubbles remain in the reinforcing layer 3 '.

  As shown in FIG. 2, in Example 2, both the monofilament 3a and the multifilament 3b are alternately wound as a lower thread of the reinforcing layer 3 'in the same spiral direction at an appropriate pitch, respectively. The configuration in which both the monofilament 3a and the multifilament 3b are alternately wound as an upper thread on the outside alternately in a different spiral direction with an appropriate pitch each at an appropriate pitch, and crossed like a mesh. Unlike the first embodiment shown in FIG. 1, the other configuration is the same as that of the first embodiment shown in FIG.

  In the case of the illustrated example, both the monofilament 3a and the multifilament 3b are alternately wound spirally at an appropriate pitch one by one as the lower thread, and both the monofilament 3a and the multifilament 3b are also wound on the outside as the upper thread. Alternately, one piece is wound in a reverse spiral shape at an appropriate pitch.

  As another example, it is also possible to arrange two or three or more multifilaments 3b between the monofilaments 3a on one or both of the upper yarn and the lower yarn.

  Therefore, in the second embodiment shown in FIG. 2, the cross-section 3c of the lower yarn monofilament 3a and the upper yarn monofilament 3a is not crushed and deformed even if the monofilaments 3a overlap with each other, so that the thickness dimension is increased. However, since the monofilaments 3a and the multifilaments 3b overlap each other or the multifilaments 3b overlap each other, the other intersections 3c are monofilaments at all intersections as described in JP-A-2006-194347. Compared with those that overlap each other, the number of intersecting portions 3c between thick monofilaments 3a can be reduced, and the hose surface can be made substantially smooth by that amount.

  Furthermore, since the lower thread and the upper thread of the reinforcing layer 3 'are balanced, the hose is excellent without twisting, and the shape retention is higher than that of the first embodiment, and it is difficult to be crushed or kinked. There are advantages.

  In Example 3, as shown in FIG. 3, the density (number of strikes), pitch or thickness of the lower thread and upper thread of the reinforcing layer 3 ′ is changed according to the desired pressure resistance. Unlike the first embodiment shown in FIG. 1 or the second embodiment shown in FIG. 2, the other configurations are the same as the first embodiment shown in FIG. 1 to FIG. 3 or the second embodiment shown in FIG. is there.

  In the case of the illustrated example, as in the first embodiment shown in FIG. 1, a plurality of multifilaments 3b are wound spirally at appropriate pitches as the lower thread of the reinforcing layer 3 ', and the upper thread is wound outside thereof. A plurality of monofilaments 3a are spirally wound at appropriate pitches so as to cross each other in a mesh shape. However, in contrast to Example 1 shown in FIG. 1, the winding directions of the lower thread and the upper thread are reversed. The density of the lower yarn and the upper yarn is changed so as to become coarse, and the thickness of each monofilament 3a and multifilament 3b is increased.

  As other examples, it is possible to change the density of the stitches of the lower yarn and the upper yarn to be dense, or to reduce the thickness of each monofilament 3a and multifilament 3b.

  Therefore, in Example 3 shown in FIG. 3, the same effects as those of Example 1 or Example 2 described above can be obtained, and in addition, monofilaments 3a and multifilaments 3b having different elongation and strength can be used as upper yarns and lower yarns. If used, there is a high possibility that the balance of strength will be lost and twisting will occur. To prevent this, it is desirable to prevent twisting of the hose by changing the winding angle, pitch and thickness of the monofilament 3a and multifilament 3b. There is an advantage that it can be designed in accordance with the withstand voltage of.

In Examples 1 and 3, the multifilament 3b is spirally wound as the lower thread and then the monofilament 3a is spirally wound as the upper thread on the outer side. However, the present invention is not limited to this. On the contrary, the monofilament 3a may be spirally wound as a lower thread, and then the multifilament 3b may be spirally wound as an upper thread on the outside thereof.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing an embodiment of a multilayer pressure-resistant hose according to the present invention, and shows an enlarged main portion. It is a partially notched perspective view which shows the other Example of the multilayer pressure | voltage resistant hose of this invention. It is a partially notched perspective view which shows other Examples of the multilayer pressure | voltage resistant hose of this invention, and has shown the principal part partially expanded.

Explanation of symbols

A Multilayer pressure resistant hose 1 Inner layer 1a Outer peripheral surface 2 Outer layer 3 Reinforcement yarn 3a Monofilament 3b Multifilament 3c Intersection 3 'Reinforcement layer

Claims (3)

A multi-layer pressure-resistant hose in which a plurality of reinforcing yarns cross each other and spirally wound between an inner layer and an outer layer,
The winding multifilament spirally along an outer peripheral surface of the inner layer as a reinforcing yarn, by winding a monofilament in a helical shape crossed in network form the outside, these intersections, the multifilament by the tension of the monofilament A multilayer pressure-resistant hose characterized in that a concave portion is formed in the concave portion, the monofilament is engaged with the concave portion, and a reinforcing layer composed of the multifilament and the monofilament is formed between the inner layer and the outer layer . 2. The multilayer pressure-resistant hose according to claim 1 , wherein the multifilament is arranged so that the multifilament deforms and bites into the outer peripheral surface of the inner layer at the intersection . The multifilament is spirally wound with appropriate tension along the outer peripheral surface of the inner layer, and the multifilament is arranged so as to bite into the outer peripheral surface while being deformed along the outer peripheral surface of the inner layer. The multilayer pressure | voltage resistant hose of Claim 1 or 2 characterized by these.

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