JP2010001899A - Synthetic resin hose and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of continuously, automatically and efficiently manufacturing a flexible hose having a hard or soft mouth part with an inner peripheral surface on which a joining part such as a seal part is formed. <P>SOLUTION: Every time when forming a hose body 1 having a predetermined length by spirally winding a soft synthetic resin belt-like material 11 in a semi-melting state at a specific pitch on a molded rotary shaft 20, a preformed hard synthetic resin or soft synthetic resin short cylindrical mouth member 2' with an inner peripheral surface on which a joining part 3 such as a seal part or a screw part is formed, is put on the molded rotary shaft 20, and a soft synthetic resin covering layer 1b fused on the mouth member 2' is formed by spirally winding the soft synthetic resin belt-like material 11 of the semi-molten state on the mouth member 2'. The mouth member 2'is divided into two parts, and thereby, the flexible hose is obtained which has, on both ends of the soft synthetic resin hose body 1, hard or soft mouth parts 2 and 2 each having the joining part 3 on the inner peripheral surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a synthetic resin hose formed by integrally forming a joint portion such as a seal portion and a screw portion on an inner peripheral surface of a mouth portion serving as a connection port, and a method for manufacturing the same.

  Conventionally, it is used for connecting or connecting a flexible fixed length for connecting a drain outlet of a sink or a drain of a basin to a drain pipe, or connecting a drain pipe to a drain outlet of an air conditioner. As a synthetic resin tube for use, or a soft synthetic resin hose used for supply, drainage hose, sprinkling hose, etc., for example, as shown in Patent Document 1, the inner peripheral surface has the same diameter over the entire length. A flexible hose in which a spiral protrusion having a synthetic resin reinforcing core wire disposed therein is integrally provided on the outer peripheral surface of a tube wall formed on a flat surface. Synthetic resin hoses have been developed in which a diameter-expanded mouth portion that is a joint portion made of the same soft synthetic resin material as that of the flexible hose is integrally provided.

  In order to manufacture such a soft synthetic resin hose having a diameter-expanded mouth part at both ends, a soft synthetic resin strip-like material in a semi-molten state is polymerized and welded on the molding rotating shaft and wound first. The inner surface is the same over the entire length by spirally winding at a constant pitch while interposing a synthetic resin reinforcing core between the soft synthetic resin strip and the next soft synthetic resin strip. The hose main molding process in which spiral ridges are integrally provided on the outer peripheral surface of the pipe wall having a diameter, and following this hose main molding process, the molding rotary shaft is covered with a cylindrical diameter-expanded mouth part molding material. The above-mentioned hose-based molding step and expansion step are formed by spirally winding the above-mentioned semi-molten soft synthetic resin belt-like material on a mold part of the diameter-portion mold while being spirally wound. Alternates between the diameter part molding process However, the soft synthetic resin expanded diameter part on the expanded diameter mold part is divided into two to obtain a hose main body having a fixed length having the expanded diameter parts at both ends, and from the expanded diameter part, the expanded area mold part The method of extracting is adopted.

  Further, in Patent Document 2, a spiral protrusion in which a synthetic resin reinforcing core wire is disposed on the outer peripheral surface of a tube wall whose inner peripheral surface is formed as a flat surface having the same diameter over the entire length. Is a flexible hose that is integrally provided with an enlarged-diameter mouth portion described in Patent Document 1 at one end thereof, while the other end has an inner diameter that is the same as the inner diameter of the hose. A flexible hose is described in which a thick mouth portion having the same diameter is integrally provided. And as a manufacturing method of this flexible hose, in the manufacturing method of the said patent document 1, whenever the hose main body of fixed length is formed on a shaping | molding rotating shaft, it is based on the said enlarged diameter opening part shaping | molding die material. The thickened soft synthetic resin is formed by increasing the thickness of the semi-molten soft synthetic resin strip that forms the hose body on the rotating shaft without using this mold material By directly spirally winding the belt-shaped material, the step of forming a thick cylindrical portion made of a soft synthetic resin having a certain length is alternately performed, and the diameter of the soft synthetic resin on the mold member is increased. A method of sequentially dividing the portion and the soft synthetic resin thick cylindrical portion into two parts is adopted.

JP 2002-286172 A JP 2003-154572 A

  However, in the synthetic resin hose, since the inner peripheral surface of the mouth part is formed on a smooth surface having the same diameter over the entire length, the hose is connected to a drain port or other pipes in a watertight manner. In addition, it is necessary to attach a sealing material such as packing that matches the above-mentioned mouth part. In addition to the sealing material, for example, when screw connection is desired, a screw member that fits the mouth part is fitted. Furthermore, if such a member is attached to the inner peripheral surface of the mouth portion, the opening ratio of the mouth portion may be reduced and smooth circulation may be hindered.

  Further, in the above method of manufacturing a synthetic resin hose, when forming the mouth portion on the molding rotary shaft, the molding rotary shaft is covered with a cylindrical diameter-expanded mouth portion molding material on the diameter-expanded mouth portion molding die material. By continuously spirally winding a flexible synthetic resin strip forming a tube wall mainly composed of a hose, an enlarged diameter mouth portion having a constant thickness is formed, and this enlarged diameter mouth portion is divided into two and from the divided mouth portion. Since the diameter-enlarged mouth portion forming member is extracted, the inner peripheral surface thereof becomes a smooth surface having the same diameter over the entire length, and an annular seal portion and a screw portion cannot be formed.

  Such a problem arises even if a soft synthetic resin strip-like material that forms a tube wall mainly composed of a hose is continuously spirally wound directly on the molding rotating shaft, as described in Patent Document 2 above. In addition, since the mouth portion is made of a soft synthetic resin belt-shaped material that forms the hose main body, only the mouth portion made of soft synthetic resin can be obtained. A synthetic resin hose in which a hard synthetic resin mouth portion is integrally provided on the hose main body cannot be manufactured.

  Furthermore, these mouth portions are thickened by increasing the thickness of the soft synthetic resin strip forming the hose main body and spirally winding it directly on the molding rotating shaft or on the molding member. Since the soft synthetic resin strip is extruded from the molding nozzle, the soft synthetic resin strip is spirally wound on the molding rotating shaft, and a hose main body having a predetermined length is molded. When the mouth portion is continuously formed from the end portion of the hose main body, the continuous portion of the hose main body and the mouth portion formed while gradually increasing the thickness of the soft synthetic resin strip is lengthened. Not only is it unclear, but when the mouth part is bent from its continuous part with respect to the hose body, the wall part on the mouth part side is thicker and the wall part on the hose body side is thinner. In the whole with rigidity Rising becomes gentle, there is a problem such as that be greatly bent there is a possibility that an obstacle at the time of construction is difficult.

  The present invention has been made in view of such problems. The object of the present invention is to integrally form a joint portion such as a seal portion and a screw portion on the inner peripheral surface at the end portion of the soft synthetic resin hose main body. A synthetic resin hose having a mouth portion made of a hard synthetic resin or soft synthetic resin mouth member, and having good flexibility from a continuous portion of the mouth portion and the hose main body, It is in providing the manufacturing method of the synthetic resin hose which can manufacture a synthetic resin hose efficiently.

  In order to achieve the above object, the synthetic resin hose according to the present invention is a soft resin having a predetermined length in which the inner peripheral surface is formed on a flat surface of the same diameter over the entire length, as described in claim 1. At least one end portion of the synthetic resin hose main body has a structure in which a synthetic resin mouth portion having a joint portion such as a seal portion and a screw portion on the inner peripheral surface is integrally provided.

  In the synthetic resin hose configured as described above, the invention according to claim 2 is such that the mouth portion forming a joint portion such as a seal portion on the inner peripheral surface is a short tube made of a soft synthetic resin or a hard synthetic resin. The structure according to claim 3 has a structure in which a soft synthetic resin coating layer connected to an end portion of a tube wall mainly composed of a soft synthetic resin hose is integrally formed on the outer peripheral surface of the shaped mouth member. Is provided at both ends of the hose main body. According to a fourth aspect of the present invention, a mouth portion is provided at one end of the soft synthetic resin hose main body, while an inner diameter is the same as the inner diameter of the soft synthetic resin hose main body and the outer diameter at the other end portion. It is characterized in that a soft synthetic resin thick end portion having a diameter larger than the outer diameter of the soft synthetic resin hose main body is provided.

  The invention according to claim 5 is a method of manufacturing the synthetic resin hose, wherein a semi-molten soft synthetic resin strip is polymerized and welded on a molding rotating shaft and spirally wound at a constant pitch. To form a soft synthetic resin hose main body whose inner surface has the same diameter over the entire length, and a hose main molding step, the hose main molding step followed by the molding rotary shaft, the inner peripheral surface of the seal portion, and the screw portion While slidably covering a ready-made short cylindrical synthetic resin mouth member forming a joint portion such as the above, the above-mentioned semi-molten soft synthetic resin belt-like material is polymerized and fused on the mouth member It consists of a mouth part molding step in which a soft synthetic resin coating layer having a constant thickness is provided by spiral winding, and the mouth member is integrally connected to the end of the hose main body by this soft synthetic resin coating layer. Followed by hose By cutting the body into fixed lengths, a soft synthetic resin coating layer is applied to the outer peripheral surface of the mouth member that forms a joint portion such as a seal portion and a screw portion on the inner peripheral surface at least at one end. It is characterized by obtaining a soft synthetic resin hose provided with a mouth portion.

  In the synthetic resin hose manufacturing method, the invention according to claim 6 includes the hose-based molding step made of a soft synthetic resin and the mouth portion molding step in which a soft synthetic resin coating layer is provided on the surface of the synthetic resin mouth member. The lip member having the soft synthetic resin coating layer layered thereon is sequentially cut from the central portion in the length direction, and the lip portion is provided with a lip portion at both ends. A synthetic resin hose is manufactured.

  Furthermore, the invention according to claim 7 is a semi-molten state soft synthetic material that is spirally wound on the molding rotary shaft each time the fixed synthetic resin hose main body is formed on the molding rotary shaft. Synthetic resin provided with a soft synthetic resin coating layer formed in the mouth part molding step while alternately performing the step of molding the thick cylindrical portion made of soft synthetic resin by increasing the thickness of the resin strip. By combining the mouthpiece member and the above-mentioned soft synthetic resin thick cylindrical part from the central part in the length direction, a synthetic part in which a joint part such as a seal part and a screw part is formed on the inner peripheral surface at one end part. To manufacture a soft synthetic resin hose provided with a mouth portion made of a thick synthetic plastic synthetic cylinder with an inner peripheral surface formed on the other end at the same diameter on the other end. Features.

  The invention according to claim 8 is another method for producing the soft synthetic resin hose of the present invention, in which a semi-molten soft synthetic resin strip is polymerized and welded onto a molding rotating shaft at a constant pitch. Thus, by spirally winding, a hose main molding process in which the inner surface forms a soft synthetic resin hose main body having the same diameter over the entire length, and the inner peripheral surface on the molding rotary shaft following this hose main molding process A semi-molten soft synthetic resin belt-shaped material in the above-mentioned semi-molten state is slidably covered with a synthetic resin-made base member made of a short cylindrical tube forming a joint portion such as a seal portion and a screw portion. A soft synthetic resin coating layer having a constant thickness is formed by spiral winding while polymerizing and fusing, and this soft synthetic resin coating layer alternates with a mouth portion molding step in which a mouth member is integrally connected to the end portion of the hose main body. After going to the hose A constant length soft synthetic resin hose having a synthetic resin mouth portion at one end is manufactured by sequentially cutting the connecting portion between the body and the mouth member layering the soft synthetic resin coating layer. It is characterized by.

  In this method of manufacturing a synthetic resin hose, the invention according to claim 9 is a semi-molten soft material that spirally winds at a constant pitch on a molding rotating shaft between the hose main body molding step and the mouth portion molding step. By increasing the thickness of the synthetic resin strip, a thick cylindrical portion made of soft synthetic resin with a certain length is formed, and the connecting portion between the thick cylindrical portion made of soft synthetic resin and the mouth member is sequentially cut. Thus, one end portion has a mouth portion made of a mouth member having a soft synthetic resin coating layer on the outer peripheral surface and a mouth portion made of a soft synthetic resin thick cylindrical portion on the other end portion. A soft synthetic resin hose is manufactured.

  According to the invention according to claim 1, since the joint portion such as the seal portion and the screw portion is formed on the inner peripheral surface of the synthetic resin mouth portion provided at the end portion of the soft synthetic resin hose main body, for example, , When this soft synthetic resin hose is connected to a drain outlet or other pipes in a watertight manner, a sealing part is not provided on the inner peripheral surface without attaching a sealing material such as a packing suitable for the mouth part. This synthetic resin hose having the formed mouth part can be connected to the watertight state easily and reliably, and in the case of screw connection, similarly, a screw part is provided on the inner peripheral surface of the mouth part. If the formed synthetic resin hose of the present invention is used, it can be easily and reliably connected. In addition, connection is possible without greatly reducing the opening area of the mouth portion, and drainage and the like can be circulated smoothly.

  Furthermore, according to the invention which concerns on Claim 2, the said edge part is the edge of the pipe wall of a soft synthetic resin hose main body on the outer peripheral surface of the ready-made short cylindrical mouth member which forms the junction part in the inner peripheral surface. When the short cylindrical lip member is made of hard synthetic resin, a flexible hose having a rigid hard lip portion is used. In the case where the short cylindrical lip member is made of a soft synthetic resin, it is possible to provide a synthetic resin hose having flexibility over the entire length together with the hose main body. However, as described above, a joint portion such as a seal portion or a screw portion can be formed on the inner peripheral surface of the mouth portion.

  The mouth portion as described above may be provided at both ends of the main body of the soft synthetic resin hose as described in claim 3, or alternatively, the soft synthetic resin hose as described in claim 4 One end of the main body is provided with a mouth portion made of the above-mentioned hard synthetic resin or soft synthetic resin mouth member having a soft synthetic resin coating layer on the outer peripheral surface, while the other end portion has a soft synthetic resin hose main body A soft synthetic resin thick end portion having the same diameter as the inner diameter of the soft synthetic resin hose and larger than the outer diameter of the main body of the soft synthetic resin hose may be provided.

  Claim 5 relates to a method for manufacturing the synthetic resin hose, wherein a semi-molten soft synthetic resin strip is polymerized and welded onto a molding rotating shaft while being spirally wound at a constant pitch so that the inner surface is formed. A hose-main molding step for forming a soft synthetic resin hose main body having the same diameter over the entire length, and a joint portion such as a seal portion and a screw portion on the inner peripheral surface after the hose main-molding step and the molding rotating shaft. A semi-molten soft synthetic resin belt-like material is polymerized and fused on the mouth member while being slidably covered with a ready-made short cylindrical synthetic resin mouth member forming A soft synthetic resin coating layer having a constant thickness and a mouth portion molding step in which a mouth member is integrally connected to the end portion of the hose main body by the soft synthetic resin coating layer, and the hose following the mouth portion molding step. main Is cut at a certain length to obtain a soft synthetic resin hose having at least one end portion and a mouth portion forming a joint portion such as a seal portion and a screw portion on the inner peripheral surface. Therefore, if a hard synthetic resin lip member is used as a ready-made lip member, a hard synthetic resin hose whose outer surface is covered with a soft synthetic resin coating layer on the end of a soft synthetic resin hose main body of a certain length A hard mouth part made of a synthetic resin mouth part can be provided. If a soft synthetic resin mouth part is used, a soft synthetic resin hose main body with a fixed length is softened on the outer peripheral surface of this mouth part member. A soft mouth part formed by layering a synthetic resin coating layer can be provided, and since a joint part such as a seal part or a screw part is formed in advance on the inner peripheral surface of these mouth members, it is constant. Long soft synthetic resin hose Manufacture and at the same time, the end of the hose main, the mouth portion having a desired junction of the seal portion or the like to the inner circumferential surface may be provided integrally.

  Furthermore, by changing the feeding interval of the ready-made short cylindrical synthetic resin mouth member for the soft synthetic resin hose main body manufactured by spirally winding a soft synthetic resin strip on the molding rotating shaft Of course, the length of the synthetic resin hose obtained can be set freely and accurately, and the soft synthetic resin in the semi-molten state is formed on the mouth member without changing the thickness of the soft synthetic resin strip. A soft synthetic resin coating layer of a certain thickness is provided by spirally winding a resin band material while polymerizing and fusing, and the mouth member is integrally connected to the end of the hose main body by this soft synthetic resin coating layer. Therefore, there is no need to adjust the thickness of the soft synthetic resin strip extruded from the molding nozzle, and a semi-molten soft synthetic resin strip having a constant thickness is always formed on the molding rotating shaft with a constant pitch. Thus, by spirally winding, it is possible to smoothly and accurately manufacture the soft synthetic resin hose main body integrally provided with the ready-made mouth member at the end, and spirally wind on the ready-made mouth member. The mouth member can be connected to the end portion of the hose main body easily and firmly integrally with the strip material made of soft synthetic resin in a semi-molten state.

  In addition, the hose main body that is continuously manufactured on the molding rotating shaft is cut at constant lengths, so that a constant portion having a mouth portion formed by providing a soft synthetic resin coating layer on the outer peripheral surface of the mouth member at one end portion. Since the length of the soft synthetic resin hose is to be manufactured, the connecting portion between the tube end and the mouth member mainly composed of the soft synthetic resin hose is formed on the outer wall of the tube wall or the mouth member mainly composed of the hose. Since it is formed with the same thickness as the soft synthetic resin coating layer that is layered, the mouth part can be bent large and smoothly from the end of the thin wall of the hose main body that is connected to the base end part. It is possible to improve the performance.

  In the synthetic resin manufacturing method, the invention according to claim 6 includes a hose-based molding step made of a soft synthetic resin and a mouth portion molding step in which a soft synthetic resin coating layer is provided on the surface of the synthetic resin mouth member. Since the synthetic resin mouth member covered with the above-mentioned soft synthetic resin coating layer is sequentially cut from the central portion in the length direction while performing alternately and continuously, the seal portion and screw on the inner peripheral surface are formed at both ends. It is possible to efficiently produce a fixed-length soft synthetic resin hose in which the mouth portion having a joint portion such as a portion is integrally provided. At this time, if a hard synthetic resin mouth member is used as the mouth member to be put on the molding rotating shaft, a fixed mouth portion having a hard mouth portion formed by laminating a soft synthetic resin coating layer on the outer peripheral surface at both ends. A long soft synthetic resin hose can be obtained, and if a soft synthetic resin lip member is used, both ends have a soft lip portion formed by laminating a soft synthetic resin coating layer on the outer peripheral surface. A long soft synthetic resin hose can be obtained. Further, if a hard synthetic resin mouth member and a soft synthetic resin mouth member are alternately covered on the molding rotating shaft, one end is hard. Thus, a soft synthetic resin hose having a certain length having a soft mouth portion at the other end portion can be obtained.

  Therefore, for example, when connecting a hard drain port made of metal or the like and a drain pipe made of a soft synthetic resin, a hard base portion connected to the hard drain port is connected to one end portion and the hard mouth portion is connected to the other end portion. Uses a soft synthetic resin hose with a soft mouth part connected to a drain pipe made of soft synthetic resin, and seals formed on the inner peripheral surface of the mouth part without using a separate sealant It can be connected in such a way that smooth distribution is possible.

  On the other hand, according to the invention according to claim 7, each time the main body of the soft synthetic resin hose having a predetermined length is formed on the molding rotating shaft, the mouth portion molding step and the semi-molten state spirally wound on the molding rotating shaft are formed. A soft synthetic resin coating layer formed in the mouth portion molding step is provided while alternately performing the step of molding the thick cylindrical portion made of soft synthetic resin by increasing the thickness of the strip material made of soft synthetic resin. Since the synthetic resin base member and the above-mentioned soft synthetic resin thick cylindrical portion are each divided from the central portion in the length direction, a joint portion such as a seal portion and a screw portion is provided on the inner peripheral surface at one end portion. The formed synthetic resin mouth part is provided with a smooth inner and outer peripheral surface made of a soft synthetic resin thick cylindrical part whose inner peripheral surface is formed with the same diameter over the entire length at the other end. A flexible synthetic resin hose can be produced efficiently.

  According to the method for manufacturing a synthetic resin hose according to claim 8, the inner surface is formed by spirally winding a semi-molten soft synthetic resin strip on a molding rotating shaft at a constant pitch while polymerizing and welding the strip. Hose main molding process that forms a soft synthetic resin hose main body of the same diameter over the entire length, and subsequent to this hose main molding process, the molding rotating shaft is joined to the inner peripheral surface such as a seal part and a screw part. A semi-molten soft synthetic resin belt-like material is spirally wound while polymerizing and fusing the above-mentioned semi-molten soft synthetic resin belt-like material on a slidable covering of a ready-made short cylindrical synthetic resin mouth member forming a portion. After forming a soft synthetic resin coating layer of a certain thickness, and alternately performing a mouth portion molding step in which a mouth member is integrally connected to the end portion of the hose body by the soft synthetic resin coating layer, Soft synthetic resin coating layer Since the connecting portion with the mouth member is sequentially cut, a synthetic resin mouth portion provided with a soft synthetic resin coating layer on the outer peripheral surface of the mouth member at one end portion and a soft portion at the other end portion is soft. It is possible to efficiently produce a soft synthetic resin hose having a fixed length having an open end portion formed of a tube wall formed by spiral winding of a synthetic resin strip.

  Further, in this method of manufacturing a synthetic resin hose, the invention according to claim 9 is a semi-molten state in which a spiral winding is performed on the molding rotating shaft at a constant pitch between the hose main body molding step and the mouth portion molding step. By increasing the thickness of the soft synthetic resin strip, a constant length of the soft synthetic resin thick cylindrical portion is formed, and the connecting portion of the soft synthetic resin thick cylindrical portion and the mouth member are sequentially formed. Therefore, it is possible to efficiently produce a fixed length soft synthetic resin hose having a synthetic resin mouth part at one end and a mouth part made of a soft synthetic resin thick cylindrical part at the other end part. Can do.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 has flexibility made of an olefin resin such as EVA resin, polyethylene, polypropylene resin, or a soft synthetic resin such as vinyl chloride resin. One or more annular seal portions 3a made of the same or different synthetic resin materials that can be fused to the soft synthetic resin at both ends of the synthetic resin hose main body 1 and having a convex arcuate cross section on the inner peripheral surface This shows a synthetic resin hose A in which a plurality of short cylindrical synthetic resin mouth portions 2 and 2 are integrally formed, and the soft synthetic resin hose main body 1 has an inner peripheral surface extending over the entire length. The reinforcing spiral ridges 4 are provided on the outer peripheral surface of the tube wall 1a having a constant thickness formed on a smooth surface having the same diameter, while the synthetic resin mouth portions 2, 2 are formed on the inner peripheral surface of the annular ring. A mouth of a short cylinder shape of a certain length forming the seal portion 3a The outer peripheral surface of the material 2 'is formed by layering a soft synthetic resin coating layer 1b continuous with the end of the tube wall 1a of the soft synthetic resin hose main body 1 and having the same thickness as the tube wall 1a. A mouth end member 2 'is integrally connected to the end of the soft synthetic resin hose main body 1 by the soft synthetic resin coating layer 1b.

  The lip member 2 'may be made of a hard synthetic resin or a soft synthetic resin. Furthermore, one lip portion 2 is coated on the outer peripheral surface of the hard synthetic resin lip member 2' with a soft synthetic resin. Layer 1b is a hard mouth part formed by layering, and the other mouth part is a soft mouth part formed by layering soft synthetic resin coating layer 1b on the outer peripheral surface of soft synthetic resin mouth member 2 '. Also good. Further, in the synthetic resin hose A, the sealing portion 3a is formed on the inner peripheral surface of the synthetic resin mouth member 2 '. However, as shown in FIG. 2, the mouth member 2' in which the screw portion 3b is formed. 3 may be used as the mouth portion 2 having a hook portion 3c having a claw-shaped cross section on the inner peripheral surface of the opening end as shown in FIG. It is only necessary to form a joint 3 that can be connected to the opening end of the drainage pipe through the joint member or without the joint member. The inner diameter of the joint portion 3 such as the seal portion 3a and the screw portion 3b is formed to be substantially the same as the inner diameter of the soft synthetic resin hose main body 1 but larger than the inner diameter of the hose main body 1. Alternatively, joints having different shapes may be formed on the inner peripheral surfaces of the mouth portions 2 and 2 at both ends.

  In addition, in the synthetic resin hose A having the synthetic resin mouth portion 2 forming the hook portion 3c as the joint portion 3, when the mouth member 2 'of the mouth portion 2 is made of a hard synthetic resin, As shown in FIG. 4, the hook portion 3c is divided into a plurality of portions in the circumferential direction so as to be radially expandable and contractable, and the hook portion 3c is provided at the opening end of the drainage hose shown in FIG. It is configured to be inserted into the conical joint portion 5 and to be engaged with the engagement end surface 5 a of the joint portion 5.

  In any of the above synthetic resin hoses A, a synthetic resin mouth member 2 'in which joint portions 3 such as a seal portion 3a and a screw portion 3b are formed on the inner peripheral surface at both ends of the soft synthetic resin hose main body 1 is formed. The synthetic resin hose A ′ shown in FIG. 5 is provided at one end of the soft synthetic resin hose main body 1 and has a seal portion 3a on the inner peripheral surface. The mouth portion 2 having the synthetic resin mouth portion 2 'forming the joint portion 3 is provided, while the other end portion has the same inner diameter as that of the soft synthetic resin hose main body 1 and the outer diameter is soft. A synthetic synthetic resin hose main body 1 is provided with a soft synthetic resin thick mouth portion 2A having a large diameter larger than the thickness of the tube wall 1a of the synthetic resin hose main body 1. In this case, in the synthetic resin mouth portion 2 in which the joint portion 3 is formed on the inner peripheral surface, as described above, the soft synthetic resin coating layer 1b layered on the outer peripheral surface of the mouth member 2 ′. Is connected to the end of the soft synthetic resin hose main body 1 integrally. However, the thick wall portion 2A of the soft synthetic resin hose main body 1 increases the thickness of the tube wall 1b of the soft synthetic resin hose main body 1. Is formed by.

  Further, the synthetic resin hose A ″ shown in FIG. 6 is made of a soft synthetic resin continuously connected to the other end of the soft synthetic resin hose main body 1 in the synthetic resin hose A ′ shown in FIG. Instead of the thick mouth portion 2A, a soft synthetic resin thin mouth portion 2B having substantially the same thickness as the tube wall 1a of the soft synthetic resin strip-like material hose main body 1 is provided. Since the other structure is the same as that of the synthetic resin hose A ′, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  In any of the above synthetic resin hoses, the reinforcing spiral protrusion 4 provided integrally on the outer peripheral surface of the tube wall of the soft synthetic resin hose main body 1 is a hollow made of the same synthetic resin as the hose main body 1. Synthetic resin reinforcing core wire 4b having moderate elasticity and hardness such as polypropylene, polyethylene, hard vinyl chloride and the like in the spiral ridge 4a is provided in a continuous spiral shape, and this synthetic resin reinforcing core wire 4b is On the mouth portions 2, 2A, 2B, they are formed with a small diameter 4b 'and are wound around the outer peripheral surfaces of these mouth portions 2, 2A, 2B in an embedded state.

  Next, the manufacturing method of the synthetic resin hose A formed as described above will be described. First, as shown in FIG. 7, a strip made of a soft synthetic resin such as a semi-molten soft vinyl chloride resin having a certain width is used. As is well known, while extruding the material 11 from the first molding nozzle 21, the opposite side portion of the subsequent strip-shaped material portion 11 b is superimposed on one side portion of the preceding strip-shaped material portion 11 a on the metal molding rotating shaft 20. The tube wall 1a having a constant thickness is formed by spirally winding at a constant pitch while being integrally welded, and has a constant diameter from the second forming nozzle 22 during the formation of the tube wall 1a. A synthetic resin reinforcing core wire 4b made of semi-molten polyethylene, polypropylene, hard vinyl chloride or the like is spirally wound on the above-mentioned synthetic resin belt-shaped material portion 11a while being extruded, and next on this reinforcing core wire 4b The above synthetic tree to wind By covering the oil strip 11b, a hollow spiral ridge 4a having a reinforcing core wire 4b is formed on the outer peripheral surface of the tube wall 1a.

  In this way, by winding the semi-molten soft synthetic resin strip 11 in a semi-molten state on the molding rotary shaft 20 in a spiral manner, a synthetic resin reinforcing core wire 4b and a hollow spiral in which the reinforcing core wire 4b is provided on the outer peripheral surface of the tube wall 1a The flexible synthetic resin hose main body 1 having flexibility is formed by forming the reinforcing spiral protrusion 4 composed of the protrusion 4a, and the soft synthetic resin hose main body 1 is formed at the tip along the rotating shaft 20 while the flexible synthetic resin hose main body 1 is manufactured. Make a continuous transition towards Then, every time the synthetic resin hose main body 1 having a predetermined length is formed, as shown in FIG. 8, on the inner peripheral surface on the base end portion of the molding rotating shaft 20 behind the molding portion of the hose main body 1. This lip member 2 is slidably covered with a ready-made short cylindrical hard synthetic resin or soft synthetic resin lip member 2 'forming a joint 3 (a plurality of annular seal portions 3a in the figure). 'Is fed into the molded part of the hose body so as to follow the synthetic resin hose body 1 and the tube wall 1a is formed on the outer peripheral surface of the mouth member 2' in a semi-molten soft synthetic resin strip 11 A soft synthetic resin coating layer 1b having the same thickness as the tube wall 1a is provided on the mouth member 2 'by continuously spirally winding and polymerizing the resin, and the end of the hose body 1 is formed by the soft synthetic resin coating layer 1b. The mouth member 2 'is continuously connected to the portion.

  In order to ensure that the semi-molten soft synthetic resin strip 11 is fused to the mouth member 2 ', the outer circumference of the mouth member 2' is fed by the heating means 23 while the mouth member 2 'is being fed into the forming part of the hose main body 1. After the surface is heated and softened to a semi-molten state, it is configured to be fed into the molding part. The outer peripheral surface of the mouth member 2 'is formed as a smooth surface having a constant diameter, and the inner diameter of the joint portion 3 is formed so as to contact the molding rotary shaft 20 so as to be slidable in the length direction. Has a length twice that of the mouth portion 2 provided at both ends of the synthetic resin hose A to be manufactured, and the outer peripheral surface of the opening at both ends is formed into a tapered surface that gradually becomes smaller in diameter toward the opening end. is doing.

  Further, when the mouth member 2 'is made of a soft synthetic resin, a part of the mouth member 2' is cut over the entire length, and by this cutting, an opposing end face that can be expanded and expanded is formed. In the case of being made of hard synthetic resin, it is divided into two half-cylindrical shapes, and the divided surfaces are joined and connected to each other as shown in FIG. 9 to form a cylindrical mouth member 2 ′. Yes.

  As described above, the synthetic resin mouth member 2 ′ thus configured is put on the molding rotary shaft 1 and sent to the molding portion of the hose main body 1, and the soft synthetic resin hose manufactured to a predetermined length. A semi-molten soft synthetic resin strip 11 is joined to the rear end of the main body 1 in the same manner as at the time of manufacturing the pipe wall of the hose main body 1 without forming the hollow spiral protrusion 4a on the outer peripheral surface. The opposite side portion of the following belt-like material portion is superposed on one side portion of the belt-like material portion to be welded together and wound spirally at a constant pitch and extruded from the second molding nozzle 21 The resin reinforcing core wire 4b has a small diameter and is spirally wound in an embedded state in the soft synthetic resin coating layer 1b, and the outer peripheral surface of the soft synthetic resin coating layer 1b is pressed by a pressing roller 24 as necessary over the entire length. And molded into a smooth surface with a constant diameter.

  Thus, the coating layer 1b is formed by spirally winding the semi-molten soft synthetic resin strip 11 on the outer peripheral surface of the synthetic resin base member 2 ', and then this coating is fed forward as shown in FIG. As described above, the semi-molten soft synthetic resin belt-like material 11 in which the coating layer 1b is formed is continuously supplied from the synthetic resin mouth member 2 ′ provided with the layer 1b onto the molding rotary shaft 20. A tube wall 1a having a constant thickness is obtained by spirally winding it at a constant pitch while superposing the opposite side portions of the subsequent strip-shaped member portion 11b on one side of the preceding strip-shaped member portion 11a and welding them together. In the course of forming the tube wall 1a, the diameter of the semi-molten synthetic resin reinforcing core wire 4b extruded from the second molding nozzle 22 is changed to the original large-diameter core wire to This is wound around the above-mentioned synthetic resin strip member 11a in a spiral shape, Continue to form a hollow spiral ridge 4a which is furnished with reinforcing wire-like material 4b on the outer peripheral surface of the tube wall 1a by overlaying the synthetic resin strip material 11b to be next wound on the core wire 4b.

  Thus, a molding process of the soft synthetic resin hose main body 1 having a fixed length on the molding rotating shaft 20, and a mouth part molding process in which the soft synthetic resin coating layer 1b is provided on the synthetic resin mouth member 2 '. While alternately performing the above, the molding rotating shaft 20 is moved forward, cooled and cooled by the cooling water sprayed from the cooling device 25 disposed on the outer side of the movement, and further, The center in the length direction of the synthetic resin mouthpiece member 2 'covered with the soft synthetic resin coating layer 1b by the cutting blade 26 disposed on the outer periphery while being advanced and pulled out from the tip of the molding rotary shaft 20. The synthetic resin mouth portion 2 in which the joint portions 3 such as the seal portion and the screw portion are formed on the inner peripheral surface at both ends of the soft synthetic resin hose main body 1 by sequentially cutting the portion into two parts. 1 is a fixed length as shown in FIG. It is intended to obtain a synthetic resin hose A.

  The synthetic resin hose A is provided with the synthetic resin mouth portions 2 and 2 forming the joint portion 3 on the upper inner peripheral surface at both ends thereof. 5 without providing such mouth portions 2 and 2 at both ends, as shown in FIG. 5, the mouth portion 2 is provided at one end portion, while the other end portion has an inner diameter of the soft synthetic resin hose main body 1. A method of manufacturing a synthetic resin hose A 'having a soft synthetic resin thick-walled base 2A having the same diameter and an outer diameter larger than the thickness of the tube wall 1a of the soft synthetic resin hose main body 1 is as follows. Next, a description will be given.

  First, as in the method for manufacturing the synthetic resin hose A, a semi-molten soft synthetic resin strip 11 having a certain width is extruded from the first molding nozzle 21 on the molding rotary shaft 20 as shown in FIG. Winding spirally at a constant pitch while superimposing the opposite side part of the following band-like material part 11b on one side part of the preceding belt-like material part 11a on the molding rotating shaft 20 and welding them together. The tube wall 1a having a constant thickness is formed by the above, and while the tube wall 1a is being formed, the semi-molten hard synthetic resin reinforcing core wire 4b having a constant diameter is extruded from the second molding nozzle 22 while being wound first. The wound synthetic resin strip 11a is spirally wound on the outer periphery of the tube wall 1a by covering the reinforcing core 4b with the synthetic resin strip 11b to be wound next. The internal hollow spiral ridge 4a is formed.

  Thus, while manufacturing the flexible synthetic resin hose main body 1 having flexibility by forming the reinforcing spiral ridges 4 on the outer peripheral surface of the tube wall 1a, the flexible synthetic resin hose main body 1 is formed on the rotating shaft 20. When the hose main body 1 having a certain length is formed, as shown in FIG. 8 above, on the base end portion of the molding rotating shaft 20 behind the molding portion of the hose main body 1, A synthetic short tube-shaped hard synthetic resin or soft synthetic resin mouth member 2 'having a joint 3 formed on the inner peripheral surface thereof is slidably covered, and this mouth member 2' is mainly composed of the synthetic resin hose. 1 is sent to the molded part of the hose main body so as to follow 1, and the semi-molten soft synthetic resin strip 11 having the tube wall 1a formed on the outer peripheral surface of the mouth member 2 'is continuously polymerized and fused. By soft spiral winding, a soft synthetic resin coating having the same thickness as the tube wall 1a is formed on the mouth member 2 '. After the layer 1b is provided and the mouth member 2 'is integrally connected to the end of the hose main body 1 by the soft synthetic resin coating layer 1b, the above-mentioned semi-molten soft synthetic resin strip is formed on the rotating shaft 20. 11 and the reinforcing core wire 4b are continuously spirally wound at a constant pitch in the same manner as described above to form the soft synthetic resin hose main body 1 having a predetermined length again.

  At this time, when the reinforcing core wire 4b is spirally wound on the soft synthetic resin coating layer 1b, the reinforcing core wire 4b has a small diameter as described above. A method of manufacturing the synthetic resin hose A 'for the soft synthetic resin hose main body 1 having a predetermined length formed continuously with the step of covering the mouth member 2' with the soft synthetic resin coating layer 1b. In this case, the next mouth member 2 'is not followed again, but the thickness of the semi-molten soft synthetic resin strip extruded from the first molding nozzle 21 is increased as shown in FIG. Thick soft synthetic resin strip 11 'is molded on the rotating shaft, and the opposite side of the strip to be wound next is overlapped on one side of the strip to be wound first. The thick cylindrical portion 6 made of a soft synthetic resin, which is substantially the same length as the above-mentioned mouth member 2 'and thicker than the tube wall 1a, is formed by spirally winding at a constant pitch.

  Thus, every time the soft synthetic resin hose main body 1 having a predetermined length is formed on the molding rotating shaft 20, as shown in FIG. 8, the synthetic resin mouth member 2 is formed at the end of the soft synthetic resin hose main body 1. And a step of forming a soft synthetic resin thickened cylindrical portion 6 at the end of the soft synthetic resin hose main body 1 as shown in FIGS. As shown in FIG. 13, it is cooled by cooling water sprayed from a cooling device 25 arranged on the outer side while moving, as shown in FIG. After being hardened, the synthetic resin mouthpiece 2 ′ covered with the soft synthetic resin coating layer 1b by the cutting blade 26 disposed on the outer periphery while being further advanced and pulled out from the tip of the molding rotary shaft 20. The length of the central part of the length direction of the soft synthetic resin thick cylindrical part 6 A synthetic resin in which a joint portion 3 such as a seal portion or a screw portion is formed on an inner peripheral surface at one end portion of a soft synthetic resin hose main body 1 by sequentially cutting and dividing the central portion in the direction into two. The mouth-making part 2 is provided with a mouth part 2A consisting of a thick cylindrical part made of a soft synthetic resin whose inner peripheral surface is formed with the same diameter (the same inner diameter as the pipe wall 1a) at the other end. A long soft synthetic resin hose A ′ is produced.

  Next, in the synthetic resin hose manufacturing method, the synthetic resin mouth member 2 ′ and the soft synthetic resin thick cylindrical portion 6 covered with the soft synthetic resin coating layer 1b are divided into two parts. Without splitting, the synthetic resin mouth portion 2 in which the joint portion 3 such as a seal portion and a screw portion is formed on the inner peripheral surface at one end portion of the soft synthetic resin hose main body 1 and the inner periphery at the other end portion. A method for producing a constant length synthetic resin hose A1 'provided with a mouth portion 2A composed of a thick cylindrical portion made of a soft synthetic resin, the surface of which has the same diameter (the same inner diameter as the tube wall 1a) over the entire length. Next, a description will be given.

  First, a semi-molten soft synthetic resin strip 11 having a certain width and a hard synthetic resin reinforcing core wire 4b are formed on the molding rotary shaft 20 by the same method as the method for manufacturing the synthetic resin hoses A and A '. Are wound at a constant pitch in a spiral shape, thereby forming a flexible synthetic resin having flexibility by forming a reinforcing spiral protrusion 4 on the outer peripheral surface of a tube wall 1a made of a soft synthetic resin having a constant thickness. When the soft synthetic resin hose main body 1 having a certain length is formed while the hose main body 1 is manufactured, as shown in FIG. 14 on the base end portion of the molding rotating shaft 20 behind the molded portion of the hose main body 1. An already-made short cylindrical hard synthetic resin or soft synthetic resin mouth member in which the joint portion 3 is formed on the inner peripheral surface formed to a half length of the synthetic resin mouth member 2 '. 2 '' is slidably covered and this mouth piece 2 '' follows the synthetic resin hose main body 1 above. The semi-molten soft synthetic resin strip 11 having the tube wall 1a of the hose body 1 formed on the outer peripheral surface of the mouth member 2 '' is polymerized and fused. However, by continuously spirally winding, a soft synthetic resin coating layer 1b having the same thickness as the tube wall 1a is provided, and a mouth member 2 '' is integrally connected to the end of the hose main body 1 by this soft synthetic resin coating layer 1b. Then, as shown in FIG. 15, the semi-molten soft synthetic resin strip 11 and the reinforcing core wire 4b are continuously spiraled on the molding rotating shaft 20 at a constant pitch in the same manner as described above. By winding, the soft synthetic resin hose main body 1 having a certain length is formed.

  At this time, a semi-molten soft synthetic resin strip 11 having a soft synthetic resin coating layer 1b formed on the lip member 2 '' is spirally wound from the tip of the lip member 2 '' onto the molding rotary shaft 20 and the tube The synthetic resin is formed while increasing the thickness of the semi-molten soft synthetic resin strip 11 spirally wound on the molding rotating shaft 20 after forming the short discard margin 1c having the same thickness as the wall 1a. A soft synthetic resin thick-walled base portion 2A ′ having the same length as the mouthpiece member 2 '' is formed, and then the thickness of the soft synthetic resin strip 11 is returned to the original thickness to obtain the above-mentioned constant length. After the soft synthetic resin hose main body 1 is formed, the lip member 2 '' covered with the soft synthetic resin coating layer 1b is connected again after the soft synthetic resin hose main body 1.

  The synthetic resin reinforcing core wire 4b for forming the reinforcing spiral protrusion 4 on the outer peripheral surface of the tube wall 1a of the soft synthetic resin hose main body 1 is spirally wound with a large diameter on the tube wall 1a in the same manner as described above. Then, from the soft synthetic resin coating layer 1b formed on the lip member 2 ″, it is spirally wound with a small diameter (thin diameter) on the soft synthetic resin thick lip portion 2A ′ through the discard margin 1c. .

  Thus, every time the soft synthetic resin hose main body 1 having a certain length is formed on the molding rotating shaft 20, the synthetic resin mouth member 2 ″ covered with the soft synthetic resin coating layer 1b is continued and this mouth member is formed. While repeating the step of forming the soft synthetic resin thick mouth portion 2A 'from the soft synthetic resin coating layer 1b coated with 2' 'through the discard margin 1c, while feeding from the tip of the molding rotary shaft 20, An opening made of a synthetic resin mouth member 2 '' coated with a soft synthetic resin coating layer 1b at one end of a soft synthetic resin hose main body 1 by cutting both ends of the disposal allowance 1c with cutting blades 26A and 26B. A constant-length synthetic resin hose A1 ′ having a clean end portion 2 and a soft synthetic resin thick end portion 2A ′ having a clean open end surface at the other end portion is obtained.

  In this method of manufacturing the synthetic resin hose A ′, the other end portion of the hose main body 1 is provided with the soft synthetic resin thick mouth portion 2A ′. The mouth portion may have the same thickness and the same structure as the tube wall 1a.

  FIG. 16 is a simplified diagram showing a method for manufacturing the synthetic resin hose A '', and in the same manner as the method for manufacturing the synthetic resin hose A ′, a semi-molten state having a certain width on the molding rotary shaft 20 The flexible synthetic resin strip 11 and the hard synthetic resin reinforcing core wire 4b are spirally wound at a constant pitch to form a reinforcing spiral on the outer peripheral surface of the soft synthetic resin tube wall 1a having a constant thickness. When the soft synthetic resin hose main body 1 having a certain length is formed while producing the flexible soft synthetic resin hose main body 1 formed by forming the protrusions 4, the rear portion of the hose main body 1 is formed. An off-the-shelf short tube-like hard member having a joint portion 3 formed on the inner peripheral surface of the base end portion of the molding rotary shaft 20 having a length that is half the length of the synthetic resin base member 2 ′. A lip member 2 '' made of synthetic resin or soft synthetic resin is slidably covered, and this lip member 2 '' is covered with the above synthetic resin. The semi-molten soft synthetic resin belt-shaped material in which the tube wall 1a of the hose main body 1 is formed on the outer peripheral surface of the mouth member 2 '' after being fed into the molded part of the hose main body 1 so as to follow the hose main body 1 11 is polymerized and fused continuously and spirally wound to provide a soft synthetic resin coating layer 1b having the same thickness as the tube wall 1a. The soft synthetic resin coating layer 1b provides a mouth at the end of the hose main body 1 at the mouth. The members 2 '' are connected together.

  Further, following the formation of the soft synthetic resin coating layer 1b by the soft synthetic resin strip 11, the semi-molten soft synthetic resin strip 11 is spirally wound from the tip of the mouth member 2 '' onto the molding rotary shaft 20. Thus, the soft synthetic resin mouth portion 2A '' having the same thickness as the tube wall 1a is formed. At this time, it is preferable to form the soft synthetic resin mouth portion 2A ″ after forming the discard margin portion 1c as described above. Then, the hose main body 1 is continuously formed again from the soft synthetic resin mouth portion 2A ″.

  Thus, every time the soft synthetic resin hose main body 1 having a certain length is formed on the molding rotating shaft 20, the synthetic resin mouth member 2 ″ covered with the soft synthetic resin coating layer 1b is continued and this mouth member is formed. While repeatedly performing the process of forming the soft synthetic resin mouth portion 2A '' from the soft synthetic resin coating layer 1b coated with 2 '' through the discard margin 1c, By opening both ends of the sleeve 1c, as shown in FIG. 6, one end of the soft synthetic resin hose main body 1 is an open end face made of a synthetic resin mouth member 2 ″ covered with a soft synthetic resin coating layer 1b. A synthetic resin hose A ″ having a certain length is provided, and the soft synthetic resin mouth portion 2A ″ having a clean opening end face is provided at the other end.

  In any of the above synthetic resin hose manufacturing methods, the inner diameter (the inner diameter of the joint 3) of the hard synthetic resin or soft synthetic resin mouth member 2 ', 2' 'is slid onto the molding rotary shaft 20. The inner diameter that can be movably covered, that is, the diameter substantially equal to the inner diameter of the tube wall 1a of the hose main body 1, is made of, for example, a soft synthetic resin that forms the inner diameter at the other end of the hose main body 1 Using a mouth member formed to have a diameter equal to the outer diameter of the thick mouth portion 2A ', a semi-molten soft synthetic resin strip 11 forming a tube wall 1a of the hose main body 1 is spirally wound on the mouth member. Thus, the soft synthetic resin coating layer 1b may be provided.

  In this case, a molding die material as shown in Patent Documents 1 and 2 having an outer diameter equal to the inner diameter of the lip member is used on the molding rotary shaft 20, and the lip member is covered on the molding rotary shaft 20 through the molding die material. After forming the mouth portion formed by coating the mouth member with the soft synthetic resin coating layer, the mold material may be extracted from the cut open end. Thus, according to the obtained synthetic resin hose, the synthetic resin hoses are fitted to the soft synthetic resin thick-walled mouth part with the mouth part formed by coating the soft synthetic resin coating layer on the mouth member. The hose with the same inner diameter can be formed over the entire length, and the mouth portion with the larger inner diameter can be formed at the end of a drain outlet or other piping without using a separate joint member. Can be directly connected.

The vertical side view which abbreviate | omitted a part of this invention synthetic resin hose. The partially omitted vertical side view showing the modification. The one part vertical side view which shows another Example. The perspective view of a mouth member. Furthermore, the partial omission vertical side view of this invention synthetic resin hose which has another structure. The partially omitted vertical side view showing the modification. The simplified side view which carried out the cross section of a part which shows the manufacturing method of a hose main body. The simplified side view which sectioned a part of state in which the mouth part is formed. The perspective view of the mouth member. The simplified side view which sectioned a part of the state which has divided the mouth member into two. The simplified side view which carried out the cross section of a part of the state which forms the thick cylindrical part. The simplified side view of the state which forms the hose main body continuously. The simplified side view which sectioned a part of the state which has divided the thick cylindrical part into two. The simplified side view which carried out the cross section of a part which shows another hose manufacturing method of this invention. The simplified side view which carried out the cross section of a part which shows another hose manufacturing method of this invention. The simplified side view which carried out the cross section of the part which shows the modification of the manufacturing method.

Explanation of symbols

A Synthetic resin hose 1 Soft synthetic resin hose
1a pipe wall
1b Soft synthetic resin coating layer 2 Synthetic resin mouth
2 'Mouth part 3 Joint part 6 Thick cylindrical part
11 Strips made of soft synthetic resin
20 Molding axis
21 First molding nozzle
22 Second molding nozzle
26 Cutting blade

Claims (9)

  At least one end of a soft synthetic resin hose main body having a predetermined length that forms a flat surface of the same diameter over the entire length of the inner peripheral surface, and a joint portion such as a seal portion and a screw portion on the inner peripheral surface A synthetic resin hose comprising a synthetic resin mouth portion formed integrally therewith.   The mouth part is connected to the tube wall end mainly of the soft synthetic resin hose on the outer peripheral surface of the short cylindrical mouth member made of the soft synthetic resin or the hard synthetic resin forming the joint part on the inner peripheral surface. The synthetic resin hose according to claim 1, wherein the soft synthetic resin coating layer is integrally layered.   The synthetic resin hose according to claim 1 or 2, wherein a mouth portion is provided at both ends of the soft synthetic resin hose main body.   One end of the soft synthetic resin hose main body has a mouth portion, while the other end has the same inner diameter as that of the soft synthetic resin hose main body and the outer diameter is larger than the outer diameter of the soft synthetic resin hose main body. The synthetic resin hose according to claim 1 or 2, further comprising a thick-walled base portion made of a soft synthetic resin having a large diameter.   A soft synthetic resin hose with the same inner diameter is formed over the entire length by spirally winding it at a constant pitch while polymerizing and welding a semi-molten soft synthetic resin strip on the molding rotating shaft. A hose main body forming step, and a prefabricated short cylindrical synthetic resin mouth member in which a joint portion such as a seal portion and a screw portion is formed on the inner peripheral surface of the forming rotating shaft following the hose main portion forming step. A soft synthetic resin coating layer of a certain thickness is provided on the mouth member by spirally winding the semi-molten soft synthetic resin strip material while polymerizing and fusing it. A lip portion forming step in which a lip member is integrally connected to the end portion of the hose main body by a coating layer, and the hose main body is cut at a predetermined length following the lip portion forming step so that at least one end portion Zhou Synthetic resin characterized by obtaining a soft synthetic resin hose having a mouth portion formed by laminating a soft synthetic resin coating layer on the outer peripheral surface of a mouth member forming a joint portion such as a seal portion and a screw portion A method for manufacturing a hose.   The soft synthetic resin coating layer was applied while the hose main molding step made of a soft synthetic resin and the mouth portion molding step in which a soft synthetic resin coating layer was provided on the surface of the synthetic resin mouth member were alternately and continuously performed. The synthetic resin hose according to claim 5, wherein a soft synthetic resin hose having a fixed length provided with a lip portion at both ends is produced by sequentially cutting the lip member from a central portion in the length direction. Hose manufacturing method.   Every time a soft synthetic resin hose main body of a certain length is formed on the molding rotating shaft, the thickness of the mouth portion molding step and the semi-molten soft synthetic resin strip wound spirally on the molding rotating shaft is increased. The synthetic resin lip member provided with the soft synthetic resin coating layer formed in the lip portion forming step and the above soft synthetic resin meat, while alternately performing the step of forming the thick cylindrical portion made of soft synthetic resin by By dividing the thick cylindrical part from the central part in the length direction, a synthetic resin mouth part forming a joint part such as a seal part and a screw part on the inner peripheral surface at one end part is provided at the other end part. 6. The synthetic synthetic resin hose according to claim 5, wherein a soft synthetic resin hose having a mouth portion composed of a thick cylindrical portion made of a soft synthetic resin having an inner peripheral surface formed to have the same diameter over the entire length is manufactured. Manufacturing method of resin hose.   A soft synthetic resin hose with the same inner diameter is formed over the entire length by spirally winding it at a constant pitch while polymerizing and welding a semi-molten soft synthetic resin strip on the molding rotating shaft. A hose main body forming step, and a prefabricated short cylindrical synthetic resin mouth member in which a joint portion such as a seal portion and a screw portion is formed on the inner peripheral surface of the forming rotating shaft following the hose main portion forming step. A soft synthetic resin coating layer of a certain thickness is provided on the mouth member by spirally winding the semi-molten soft synthetic resin strip material while polymerizing and fusing it. After alternately performing the mouth portion molding step of integrally connecting the mouth member to the end portion of the hose main body by the coating layer, the hose main body and the mouth member having a soft synthetic resin coating layer on the outer peripheral surface Sequentially cut the connected parts And a method for producing a synthetic resin hose which is characterized by the production of soft synthetic resin hose having a constant length with a synthetic resin lip section at one end.   By increasing the thickness of the semi-molten soft synthetic resin strip that is spirally wound on the molding rotation shaft at a constant pitch between the hose main molding process and the mouth part molding process, A thick synthetic resin-made cylindrical part is formed, and the connecting part of the soft synthetic resin-made thick cylindrical part and the mouth member is sequentially cut, so that a soft synthetic resin coating layer is attached to the outer peripheral surface at one end. The synthetic resin hose according to claim 8, wherein a soft synthetic resin hose having a fixed length having a mouth portion made of a thick cylindrical portion made of soft synthetic resin at the other end is manufactured. Production method.

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