JP4853492B2 - Extrusion method and apparatus - Google Patents

Description

  The present invention relates to an extrusion method and an extrusion apparatus for covering a plurality of linear bodies in close contact with the outer periphery of a central linear member along the longitudinal direction thereof.

  Conventionally, an extruder 90 as shown in FIG. 9 is used when one type of material is extruded and coated on the central linear member.

  The extruder 90 includes a screw 91 and an outer cylinder 92 that accommodates the screw 91. The screw 91 is provided with an insertion hole 93 through which the center line-shaped member 97 passes at the center thereof, and an extrusion channel 95 is formed by providing a spiral projection 94 on the outer peripheral surface thereof. Further, the tip portion (left side in the drawing) of the screw 91 is formed in a shape with a narrowed outer periphery (outer diameter), and a die portion 96 is formed by the tip portion and the inner wall of the outer cylinder 92.

  When performing extrusion molding with this extruder 90, the material is supplied to the extrusion flow path 95 from a material supply portion (hopper) 98 provided in the outer cylinder 92 while the central linear member 97 is passed through the insertion hole 93. The material pushed in by the rotation of the screw 91 is conveyed to the die portion 96 side, and the material 99 is covered on the outer periphery of the center line-shaped member 97. The outer diameter of the central linear member 97 after coating (the outer diameter of the coating member) can be set by the inner diameter of the nipple 100 connected to the outlet of the extruder 90. The feed speed of the central linear member 97 is determined by the screw 91. The rotation speed is controlled.

  When raw rubber is used as the material 99, a rubber-coated product can be manufactured by passing the center linear member 97 coated with the material 99 through a heating furnace and vulcanizing the raw rubber as the material.

JP 2005-207768 A JP-A-10-119395 Japanese Patent Laid-Open No. 11-343507

  Incidentally, there is an optical fiber load sensor using an optical fiber as a load sensor attached to an automobile bumper or the like. For example, as shown in FIGS. 10 (a) and 10 (b), this optical fiber load sensor has a circular shape in a sectional view wound spirally around the outer periphery of a center line-shaped member 102 made of a plastic optical fiber. A linear body 103 and a protective body 104 such as rubber covering the central linear member 102 and the linear body 103 are provided (see, for example, Patent Document 1).

  In such an optical fiber load sensor 101, when the gap is formed between the linear bodies 103, the inventors deform the linear bodies 103 beyond the elastic limit of the linear bodies 103, and As a result, it has been discovered that the deformed linear body 103 may not be restored to its original shape. In other words, if a gap is formed between the linear bodies 103, the sensitivity of the optical fiber load sensor 101 is increased. Has discovered that there is a problem of falling or fluctuating.

  Further, prior to the present invention, the present inventors use a single linear body in which a plurality of types of linear bodies having elasticity and different hardnesses are spirally formed on the outer periphery of the optical fiber. It was discovered that the change in the optical transmission loss due to the stress was larger than that of the conventional optical fiber load sensor, and that an optical fiber load sensor with excellent sensitivity could be realized.

  In view of the circumstances described above, at least an invention relating to an extrusion method and an extrusion apparatus capable of extrusion-molding a plurality of types of linear bodies on the outer periphery of a central linear member has been desired.

  However, in the extruder 90 of FIG. 9, only one type of material can be coated on the outer periphery of the central linear member, and a plurality of types of materials (a plurality of types of linear bodies) cannot be extruded in a spiral shape. There's a problem.

  Further, as another extruder, Patent Document 2 discloses that the shape of the groove portion of the screw is narrowed toward the bottom surface so that the material can be uniformly flowed and extruded, and the screw groove can be extruded. An extruder is described in which the molten resin does not accumulate on the bottom of the groove and does not burn. However, this extruder cannot extrude a plurality of types of materials.

  Furthermore, Patent Document 3 describes an extruder that produces an inner molded body or a hollow spiral rod-like body, but even in this extruder, a plurality of types of spirals are formed on the outer periphery of the center line-shaped member. The material cannot be extruded.

  As described above, an object of the present invention is to provide an extrusion method and an extrusion apparatus capable of extruding a plurality of linear bodies in a spiral shape at least on the outer periphery of a central linear member.

  The present invention was devised to achieve the above object, and the invention according to claim 1 is an extrusion method for forming a plurality of linear bodies along the longitudinal direction of the outer periphery of a central linear member. The extruder is composed of a plurality of material supply units that extrude and supply the material of the linear body, and a die that wraps and extrudes the material from each material supply unit around the outer periphery of the central linear member, A plurality of extrusion passages that form an insertion passage through which the central linear member passes through the axial center of the die, and that form the material supplied from each material supply unit into the linear body on the outer periphery of the insertion passage. Further, the extrusion flow path is merged at the outlet side of the insertion passage, the material of the linear body is supplied from each material supply unit to the extrusion flow path, and the die is rotated while rotating the die. The central linear member on the outlet side of the die On the outer circumference, the strip a and the helical or SZ stranded form, an extrusion method for forming a plurality of linear bodies.

  The invention according to claim 2 is the extrusion method according to claim 1, wherein the linear body is formed in a spiral shape by rotating the die in one direction.

  According to a third aspect of the present invention, N extrusion channels are formed in the circumferential direction of the die, the rotation direction of the die is switched within a range of 360 / N degrees, and the linear body is formed in an SZ twisted shape. The extrusion method according to claim 1.

According to a fourth aspect of the present invention, in the extrusion method for forming a plurality of linear bodies along the longitudinal direction on the outer periphery of the central linear member, the plurality of extruders extrude and supply the material of the linear bodies. And a die that wraps and extrudes the material from each material supply unit around the outer periphery of the central linear member, and forms an insertion passage through which the central linear member passes. And a plurality of extrusion channels are formed on the outer periphery of the insertion passage to form the material supplied from each material supply section into the linear body, and the extrusion passages are arranged on the outlet side of the insertion passage. The plurality of linear bodies are joined together so as to be in contact with the central linear member, and the material of the linear bodies is supplied to the extrusion flow path from each material supply unit, and the central linear member is Rotate the front of the die at the outlet side The outer periphery of the central linear member, in a band at and helical or SZ stranded form, an extrusion method for forming such twisted closely a plurality of linear bodies.

  The invention according to claim 5 is the extrusion method according to claim 4, wherein the central linear member is rotated in one direction to form the linear member in a spiral shape.

  The invention according to claim 6 is the extrusion method according to claim 4, wherein the linear body is formed in an SZ twist shape by switching the rotation direction of the central linear member at a predetermined angle.

  The invention according to claim 7 is an extrusion apparatus for forming a plurality of linear bodies along the longitudinal direction on the outer periphery of the central linear member. And a rotatable die that wraps and pushes the material from each material supply portion around the outer periphery of the center line-shaped member, and passes the center line-shaped member through the axis of the die. And a plurality of extrusion passages for forming the material supplied from each material supply section into the linear body is formed on the outer periphery of the insertion passage, and the extrusion passages are formed in the insertion passage. This is an extrusion device joined at the outlet side.

  The invention according to claim 8 is the extrusion apparatus according to claim 7, wherein N extrusion channels are formed in the circumferential direction of the die, and the width of each extrusion channel is formed at about 360 / N degrees. .

  A ninth aspect of the present invention is the extrusion device according to the seventh or eighth aspect, wherein the outlet of the die is provided with a nipple having a rectangular outlet shape that is held so as not to rotate.

According to a tenth aspect of the present invention, in the extrusion apparatus for forming a plurality of linear bodies along the longitudinal direction on the outer periphery of the central linear member, a plurality of extruders extrude and supply the material of the linear bodies. The material supply section and the die that wraps and extrudes the material from each material supply section around the outer periphery of the center line-shaped member, and the center line shape that is conveyed while rotating around the axis of the die. A plurality of extrusion passages are formed on the outer periphery of the insertion passage, and the material supplied from each material supply unit is formed into the linear body. Further, the extrusion passages are formed. Is an extrusion device that joins the plurality of linear bodies so as to be in contact with the central linear member at the outlet side of the insertion passage.

  According to an eleventh aspect of the present invention, a rotary feed device is provided on the upstream side of the extruder to feed the central linear member while rotating it in the circumferential direction, and is synchronized with the rotary feed device on the downstream side of the extruder. The extrusion device according to claim 10, further comprising: a rotary winding device that rotates and then winds the linear body formed on the outer periphery of the central linear member with the extruder.

  The invention according to claim 12 is the extrusion apparatus according to claim 10 or 11, wherein a die having a rectangular exit shape is provided at the outlet of the extruder so as to rotate in synchronization with the central linear member.

  According to the present invention, a plurality of extrusion channels are formed on the outer periphery of the insertion tube, and a rotatable die is provided at the outlet of the extrusion channel and is rotated, or the center line-shaped member is fixed by fixing the die. By rotating, a plurality of linear bodies can be formed in a strip shape and a spiral shape or an SZ twist shape on the outer periphery of the central linear member.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  First, the covering member manufactured in the first embodiment will be described.

  As shown in FIGS. 2A and 2B, the covering member 21 is in close contact with the center line member 22 along the longitudinal direction on the outer periphery of the center line member 22 and the center line member 22. In this way, a plurality of (two in FIG. 1) linear bodies 23 are covered.

  For example, an optical fiber such as a glass optical fiber or a plastic optical fiber (POF), an electric wire such as a copper wire, or the like may be used as the center line member 22. Moreover, as the linear body 23, it is good to use rubbers, such as silicone rubber, a thermoplastic elastomer, resin etc., for example.

  In the first embodiment, a plastic optical fiber is used as the central linear member 22, silicone rubber is used as the linear body 23, and the covering member 21 functions as an optical fiber load sensor.

  The linear body 23 is formed in a substantially rectangular shape (band shape) in a cross-sectional view. The linear body 23 includes a first linear body 23 a and a second linear body 23 b, and the first linear body 23 a and the second linear body are disposed on the outer periphery of the central linear member 22. 23b is closely and spirally coated. That is, the covering member 21 is formed so as to be in close contact with each other between the center line member 21 and the linear body 23 and between the first linear body 23a and the second linear body 23b. Thereby, when the covering member 21 is used as an optical fiber load sensor, it is possible to realize a sensor with lower sensitivity or less fluctuation. Note that the first linear body 23a and the second linear body 23b have different hardness (rubber hardness), for example.

  In the covering member 21, the first linear body 23 a and the second linear body 23 b are periodically switched every predetermined length by the rotation of a die described later.

  Next, the extrusion apparatus according to the first embodiment will be described.

  As shown in FIG. 3, the extrusion device 30 according to the first embodiment includes a delivery device 31 that sends out the central linear member 22, and a linear body 23 (23 a, 23 b) on the outer periphery of the central linear member 22. Extruder 10 that extrudes and coats the material, and the material of linear body 23 (23a, 23b) coated on the outer periphery of central linear member 22 is heated and vulcanized to form linear body 23 (23a, 23b). And a heating furnace 32 for forming the covering member 21, and a winding device 33 for winding the covering member 21. When a thermoplastic elastomer is used for the linear body 23, since the vulcanization is unnecessary, the heating furnace 32 can be omitted.

  The feeding device 31 and the winding device 33 are fixed so as not to rotate with respect to the central axis of the center line member 22 so that the center line member 22 does not rotate.

  As shown in FIGS. 1 (a) to 1 (h), an extruder 10 includes a plurality of (two in FIG. 1 (a)) material supply units 11 and 12 for extruding and supplying a linear material, and materials. The material from the supply parts 11 and 12 is comprised from the rotatable die | dye 13 which winds around the outer periphery of the center linear member 22, and extrudes.

  The first material supply unit 11 extrudes and supplies the material of the first linear body 23a to the extrusion channel A, and the material supply provided at the rear end of the material supply screw 11a. Screw rotating gear portion 11b, a driving device (not shown) connected to the material supplying screw rotating gear portion 11b, and a first material for supplying the material of the first linear body 23a to the material supplying screw 11a. And an inlet 11c.

  Similarly, the second material supply unit 12 is provided at the material supply screw 12a for extruding and supplying the material of the second linear body 23b to the extrusion flow path B, and at the rear end portion of the material supply screw 12a. The material supplying screw rotating gear portion 12b, a driving device (not shown) connected to the material supplying screw rotating gear portion 12b, and the material of the second linear body 23b are supplied to the material supplying screw 12a. And a second material inlet 12c. In FIG. 1A, for simplification of the drawing, the second material input port 12c is drawn below the material supply screw 12a, but actually, the second material input port 12c is formed of the material supply screw. 12a is provided above.

  The extruder 10 includes an insertion passage 14 formed in the center of the die 13 and passing through the center line-shaped member 22, and a material supplied from the material supply units 11 and 12 formed on the outer periphery of the insertion passage 14. Are provided with extrusion channels A and B which are formed into linear bodies 23a and 23b.

  In the first embodiment, the insertion passage 14 is formed by the insertion tube 15 provided at the axial center of the extruder 10 and the die 13 provided at the tip (left side in the drawing).

  A cylindrical outer tube 16 is coaxially provided on the outer periphery of the insertion tube 15, and outlets of the material supply units 11 and 12 are connected to a rear end portion (right side in the drawing) of the outer tube 16.

  As shown in FIGS. 1C to 1E, a plurality (two in FIG. 1) of partition plates 17 are formed between the insertion tube 15 and the outer cylinder 16. Thus, the extrusion channels A and B are partitioned by the partition plate 17 and are formed along the outer periphery of the insertion tube 15 to have a width of about half (about 180 degrees) in the circumferential direction. When an optical fiber load sensor is manufactured as the covering member, the thickness of the partition plate 17 is such that there is no gap between the linear bodies 23a and 23b wound around the outer periphery of the central linear member 22 after manufacturing. It is desirable to make the thickness so as not to be a hindrance to the formation. This is because it is considered essential to realize a sensor with little decrease or fluctuation in sensitivity.

  A die 13 is rotatably provided at the distal ends of the insertion tube 15 and the outer cylinder 16. A circular hole 13a serving as an insertion passage 14 is formed at the center of the rear end surface (right side in the figure) of the die 13, and the extrusion channels A and B are formed extending radially outward from the hole 13a. A pair of material passage holes 13b was formed (see FIG. 1 (f)).

  The hole 13a and the material passage hole 13b of the die 13 are formed so as to converge toward the tip side (the left side in the drawing) of the die 13 and gradually become circular in a cross-sectional view. Thereby, each extrusion flow path A and B merges at the exit of the die 13. The exit of the die 13 serving as the exit of the extruder 10 is formed in the same shape (circular shape) as the covering member 21 to be manufactured.

  The die 13 is provided with a die rotating gear portion 18 for rotating the die 13, and a driving device (not shown) is connected to the die rotating gear portion 18.

  Next, the extrusion method according to the first embodiment will be described.

  First, the central linear member 22 delivered from the delivery device 31 passes the insertion tube 15 and feeds the materials of the linear bodies 23a and 23b from the material inlets 11c and 12c of the material supply portions 11 and 12, respectively. Each charged material passes through the extrusion channels A and B and reaches the die 13.

  Here, with reference to FIGS. 4A to 4D, how each material is coated on the outer periphery of the center line-shaped member 22 by the rotation of the die 13 will be described.

  First, when the die 13 is located at the position shown in FIG. 4A, the material of the first linear body 23a supplied from the extrusion channel A on the upper side of the drawing passes through the material passage hole 13b on the right side of the drawing, and the lower side of the drawing. The material of the second linear body 23b supplied from the extrusion channel B on the side passes through the material passage hole 13b on the left side of the drawing and is coated on the outer periphery of the central linear member 22.

  Thereafter, when the die 13 is rotated and reaches the position shown in FIG. 4B, the extrusion flow path A for supplying the material of the first linear body 23a passes from the right material passage hole 13b to the left material passage hole 13b. The extrusion flow path B for supplying the material of the second linear body 23b is switched from the left material passage hole 13b to the right material passage hole 13b.

  Thereafter, the position returns to the position of FIG. 4A again through the positions of FIG. 4C and FIG. 4D, and again when rotating from the position of FIG. 4A to the position of FIG. 4B. The extrusion channels A and B for each material are switched.

  That is, in the covering member 21 manufactured using the extruder 10, the material of the first linear body 23a and the material of the second linear body 23b are periodically switched every time the die 13 is rotated 180 degrees. It will be.

  The linear bodies 23 a and 23 b extruded to the outer periphery of the central linear member 22 are formed into the outlet shape (circular shape) of the die 13 that serves as the outlet of the extruder 10. Thereby, the material of the linear bodies 23a and 23b is formed on the outer periphery of the central linear member 22 so as to be closely twisted in a band shape and a spiral shape.

  After the material of the linear bodies 23a and 23b is coated on the outer periphery of the central linear member 22 by the extruder 10, this is heated in the heating furnace 32 to vulcanize the material of the linear bodies 23a and 23b. If the bodies 23a and 23b are formed and wound up by the winding device 33, the covering member 21 shown in FIG. 2 is obtained.

  In the first embodiment, the case where two different types of linear bodies 23a and 23b are formed has been described. However, when covering three or more types of linear bodies, N material supply units are installed. At the same time, the insertion tube 15 and the outer cylinder 16 are partitioned by N partition plates 17, and a width of about 1 / N (about 360 / N degrees) in the circumferential direction along the outer periphery of the insertion tube 15. It is preferable to form N extrusion flow paths having N, and further form N material passage holes 13b of the die 13.

  As described above, in the first embodiment, the extruder 10 supplies the material of the linear bodies 23a and 23b by extruding and supplying the material, and the material from each of the material supply units 11 and 12 is supplied. The die 13 is wound around the outer periphery of the center line member 22 and pushed out, and an insertion passage 14 is formed through the center line member 22 at the axial center of the die 13. A plurality of extrusion channels A and B for forming the materials supplied from the material supply units 11 and 12 into the linear bodies 23 a and 23 b are formed, and the extrusion channels A and B are joined at the outlet of the die 13. The materials of the linear bodies 23a and 23b are supplied from the material supply portions 11 and 12 to the extrusion channels A and B, and the outer periphery of the center linear member 22 is rotated on the outlet side of the dice 13 while rotating the dice 13. , Strip and spiral, Becomes linear member 23a, it is formed as twisted closely the 23b.

  Thereby, the coating | coated member 21 which formed the different linear bodies 23a and 23b in the outer periphery of the center linear member 22 in the strip | belt shape and spiral shape can be manufactured. Further, no gap is formed between the linear bodies 23a and 23b, or between the linear bodies 23a and 23b and the central linear member 22, and therefore between the linear bodies 23a and 23b and between the linear bodies 23a and 23b. Thus, the covering member 21 can be formed in which the central linear member 22 is closely twisted.

  In the present invention, the linear bodies 23 a and 23 b are manufactured by the extruder 10, and at the same time, the linear bodies 23 a and 23 b are spirally coated on the outer periphery of the central linear member 22.

  When manufacturing the covering member 21, for example, a first linear body and a second linear body having a rectangular cross-sectional view are formed in advance, and the first linear body and the second linear body are formed. In this method, when winding the linear body, there is a gap between the linear bodies or between each linear body and the central linear member 22. In addition, two steps of manufacturing the linear body and a step of winding the linear body are required, which is not suitable for mass production and is not preferable in terms of maintaining a certain quality.

  According to the present invention, since the linear bodies 23a and 23b are manufactured, the linear bodies 23a and 23b can be spirally wound around the outer periphery of the central linear member 22, so that the number of steps can be reduced. Therefore, mass production becomes easy to implement, and the covering member 21 can be manufactured at low cost.

  In the first embodiment, the dice 13 is rotated in one direction to form the linear bodies 23a and 23b in a spiral shape. However, the rotation direction of the dice 13 is switched every 180 degrees, and FIG. You may form the coating | coated member 51 which has SZ strand-like linear bodies 23a and 23b as shown in FIG.5 (b). When three or more types of N linear bodies are covered in an SZ twist shape, the rotation direction of the die 13 may be switched every 360 / N degrees.

  In the covering member 21 of FIG. 2, since the die 13 is rotated in one direction, the material of the first linear body 23a and the material of the second linear body 23b are mixed when the extrusion flow path is switched. As a result, the purity of each completed linear body 23a, 23b is somewhat lowered. However, by changing the rotation direction of the die 13 every 180 degrees (in the case of N types, every 360 / N degrees) to form an SZ twist, the material of the first linear body 23a and the second linear body It can prevent that the material of 23b mixes and the purity of each linear body 23a, 23b falls.

  Next, a second embodiment of the present invention will be described.

  The extrusion device 60 shown in FIG. 6 includes a rotary delivery device 61 that sends out the central linear member 22, an extruder 62 that coats the material of the linear bodies 23a and 23b on the outer periphery of the central linear member 22, and a coated wire. The materials 23a and 23b are heated and vulcanized to form the linear bodies 23a and 23b, and a heating furnace 63 for forming the covering member 71 and a rotary winding device 64 for winding the covering member 71. Become.

  The rotation delivery device 61 is rotatably installed so as to rotate the sent center line member 22 in the circumferential direction, and the rotary winding device 64 is rotated in synchronization with the rotation delivery device 61. Guide rolls 65 are arranged on the downstream side of the rotary delivery device 61 and on the upstream side of the rotary winding device 64, respectively.

  The extruder 62 has basically the same configuration as that of the extruder 10 in FIG. 1A, and is provided with a normal die 66 that does not rotate instead of the rotatable die 13. The outlet shape of the die 66 serving as the outlet of the extruder 62 is formed in the same shape (circular shape) as the covering member 71 to be manufactured.

  When manufacturing the covering member 71 using the extrusion device 60 of FIG. 6, first, the rotary delivery device 61 and the rotary take-up device 64 are rotated in one direction in synchronism, and in this state, the center line extends from the rotary delivery device 61. The member 22 is delivered. Thereby, the center line-shaped member 22 is conveyed, rotating in the circumferential direction.

  Thereafter, the central linear member 22 is introduced into the extruder 62, the material of the linear bodies 23a and 23b is supplied to the material supply units 11 and 12, and the linear bodies 23a and 23b are provided on the outer periphery of the central linear member 22. The material is coated. At this time, since the central linear member 22 rotates in the circumferential direction, the material of the linear bodies 23a and 23b is covered in a strip shape and a spiral shape.

  After the outer periphery of the center linear member 22 is coated with the material of the linear bodies 23a and 23b, the linear bodies 23a and 23b are formed by heating in the heating furnace 63 and vulcanizing the material of the linear bodies 23a and 23b. If this is wound up by the rotary winding device 64, the covering member 71 shown in FIGS. 7A and 7B is obtained.

  In the extruder 10 of FIG. 1, when the die 13 is rotated in one direction to form the helical linear bodies 23a and 23b, the linear bodies 23a and 23b are switched for each predetermined length. In the embodiment, the covering member 71 having the helical linear bodies 23a and 23b can be manufactured without replacing the linear bodies 23a and 23b every predetermined length.

  In the second embodiment, the central linear member 22 is rotated in one direction to form the spiral linear bodies 23a and 23b. However, the rotational directions of the rotary delivery device 61 and the rotary winding device 64 are set at a predetermined angle. The cover member 51 having the SZ twisted linear bodies 23a and 23b as shown in FIGS. 5 (a) and 5 (b) is formed by switching the rotation direction of the central linear member 22 by switching each time. May be.

  In the above embodiment, the case where the circular covering members 21, 51 and 71 are manufactured in a cross-sectional view has been described. However, as shown in FIGS. 8 (a) and 8 (b), the rectangular covering member 21, 51, 71 is rectangular. The covering member 81 may be formed.

  When manufacturing the coating | coated member 81 using the extruder 10 of Fig.1 (a), it is good to provide the die | dye which made the exit shape a rectangular shape in the exit of the die | dye 13, and hold | maintain this die so that it may not rotate.

  Since each material coated on the outer periphery of the center line-shaped member 22 is formed into its outlet shape when passing through the nipple, a cross-sectional view is provided by providing a die having a rectangular outlet shape at the outlet of the die 13. Thus, the rectangular covering member 81 can be manufactured.

  When the extrusion device 60 of FIG. 6 is used, a die having a rectangular exit shape is provided at the outlet of the die 66 of the extruder 62, and the die is rotated in synchronization with the rotation of the center line member 22. Good.

  By manufacturing a rectangular covering member 81 in a cross-sectional view, the covering member 81 is installed on the installation object as compared with the covering member 21 having a circular cross section shown in FIGS. 2 (a) and 2 (b). In addition, it is possible to prevent dust such as sand from entering between the covering member 81 and the installation target. Moreover, it can suppress that the coating | coated member 81 comes off by vibration. That is, the covering member 81 can be stably installed on the installation object.

  If necessary, a tension member may be incorporated in or attached to the linear body or on the surface thereof.

  As a method of extruding a linear body with a tension member, for example, a tension member layer covering the entire linear body is extruded, and the linear body and the tension member layer are integrated in the vulcanization process, or It is advisable to mix a short linear tension member with the material of each linear body in advance and push it out.

  Furthermore, a sheath for protecting the linear body may be formed on the outer periphery of the linear body. This sheath is formed, for example, by winding a PET tape around the outer periphery of the linear body. As the PET tape, for example, a tape having a thickness of 25 μm and a width of 10 mm is used, and this may be wound with a ½ wrap. The overlapping portion of the PET tape can be waterproofed by heating and fusing it in a heating furnace or the like.

  Further, instead of the PET tape, a sheath may be formed by further extruding and coating silicone rubber or the like to a thickness of about 0.2 mm on the outer periphery of the linear body, and vulcanizing this.

  In the above embodiment, an example in which a central linear member is coated with a plurality of different types of linear bodies has been shown, that is, a plurality of types of linear bodies, all of which are different, Even if there are at least two types of different linear bodies, that is, even when two types of linear bodies (for example, three linear bodies) are covered, the scope of this right included.

  The present invention is used, for example, in manufacturing an optical fiber load sensor in which a plurality of linear bodies having different hardnesses are coated in a strip shape and a spiral shape on the outer periphery of an optical fiber.

  Moreover, although the example which used the plastic optical fiber as the center linear member 22 was demonstrated in the said embodiment, the outer periphery of electric wires, such as a copper wire, coat | covers several linear bodies from which hardness differs in strip | belt shape and spiral shape An electric wire may be formed. Thereby, the manufactured covered electric wire can be easily bent.

  In addition, the thing in the state which made the some linear body closely_contact | adhere in the said embodiment without gap is an example to the last.

1A is a cross-sectional view of the extruder used in the first embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line 1B-1B, and FIG. 1C is a cross-sectional view taken along line 1C-1C. FIG. 1 (d) is a sectional view taken along line 1D-1D, FIG. 1 (e) is a sectional view taken along line 1E-1E, FIG. 1 (f) is a sectional view taken along line 1F-1F, and FIG. The 1G-1G sectional view, FIG.1 (h) is the 1H-1H sectional view. It is the side view and cross-sectional view of the coating | coated member manufactured using the extruder of FIG. It is the schematic of the extrusion apparatus which concerns on the 1st Embodiment of this invention. 4A to 4D are views for explaining an extrusion method according to the first embodiment of the present invention. Fig.5 (a) is a side view of the SZ twisted coating | coated member manufactured by this invention, FIG.5 (b) is the cross-sectional view. It is the schematic of the extrusion apparatus which concerns on the 2nd Embodiment of this invention. Fig.7 (a) is a side view of the coating | coated member manufactured using the extrusion apparatus of FIG. 6, FIG.7 (b) is the cross-sectional view. FIG. 8A is a side view of a rectangular optical fiber load sensor produced in the present invention in a cross-sectional view, and FIG. 8B is a cross-sectional view thereof. It is a schematic side view of the conventional extruder. FIG. 10A is a cross-sectional view of a conventional optical fiber load sensor, and FIG. 10B is a side view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Extruder 11, 12 Material supply part 13 Dies 14 Insertion path 22 Center linear member 23 Linear body 23a 1st linear body 23b 2nd linear body 30 Extrusion apparatus A, B Extrusion flow path

Claims (12)

  In an extrusion method of forming a plurality of linear bodies along the longitudinal direction on the outer periphery of the central linear member, an extruder is provided with a plurality of material supply units that extrude and supply the material of the linear bodies, and The material from the material supply unit is configured with a die that is wound around and extruded from the outer periphery of the central linear member, and an insertion passage through which the central linear member passes is formed at the axial center of the die, and the insertion passage A plurality of extrusion passages for forming the material supplied from each of the material supply portions into the linear body are formed on the outer periphery, and the extrusion passages are merged at the outlet side of the insertion passage to supply each material. While supplying the material of the said linear body from the part to the said extrusion flow path, rotating the said dice | dies, on the outer periphery of the said center linear member on the exit side of the said dice | dies, it is strip | belt-shaped and spirally or SZ twisted Forming a plurality of linear bodies Extrusion wherein the.   The extrusion method according to claim 1, wherein the linear body is formed in a spiral shape by rotating the die in one direction.   2. The extrusion according to claim 1, wherein N extrusion channels are formed in a circumferential direction of the die, the rotation direction of the die is switched within a range of 360 / N degrees, and the linear body is formed in an SZ twist shape. Method. In an extrusion method of forming a plurality of linear bodies along the longitudinal direction on the outer periphery of the central linear member, an extruder is provided with a plurality of material supply units that extrude and supply the material of the linear bodies, and The material from the material supply unit is configured with a die that is wound around and extruded from the outer periphery of the central linear member, and an insertion passage through which the central linear member passes is formed at the axial center of the die, and the insertion passage on the outer circumference, the material supplied from the material supply unit to form a plurality of extrusion channels for shaping the linear body, further wherein the plurality of linear bodies that extrusion passage at the outlet side of the through passage Are joined so as to be in contact with the central linear member, and the material of the linear body is supplied from each material supply unit to the extrusion flow path, and the central linear member is rotated while rotating the central linear member. Outside the central linear member on the outlet side To, in a band at and helical or SZ stranded form, extrusion method, and forming as twisting closely a plurality of linear bodies.   The extrusion method according to claim 4, wherein the central linear member is rotated in one direction to form the linear member in a spiral shape.   The extrusion method according to claim 4, wherein the rotation direction of the central linear member is switched at a predetermined angle to form the linear body in an SZ twisted shape.   In an extrusion apparatus that forms a plurality of linear bodies on the outer periphery of the central linear member along the longitudinal direction thereof, the extruder includes a plurality of material supply units that extrude and supply the material of the linear bodies, and The material from the material supply unit is composed of a rotatable die that is wound around and pushed out from the outer periphery of the central linear member, and an insertion passage through which the central linear member passes is formed at the axial center of the die, and A plurality of extrusion channels for forming the material supplied from each material supply unit into the linear body is formed on the outer periphery of the insertion path, and the extrusion channels are joined at the outlet side of the insertion path. An extrusion device characterized by that.   The extrusion apparatus according to claim 7, wherein N extrusion channels are formed in the circumferential direction of the die, and the width of each extrusion channel is formed at about 360 / N degrees.   The extrusion apparatus according to claim 7 or 8, wherein a nipple having a rectangular outlet shape is provided at the outlet of the die so as not to rotate. In an extrusion apparatus that forms a plurality of linear bodies on the outer periphery of the central linear member along the longitudinal direction thereof, the extruder includes a plurality of material supply units that extrude and supply the material of the linear bodies, and The material from the material supply unit is composed of a die that is wound around the outer periphery of the central linear member and pushed out, and an insertion passage through which the central linear member that is conveyed while rotating is formed at the axial center of the die And a plurality of extrusion channels are formed on the outer periphery of the insertion passage to form the material supplied from each material supply section into the linear body, and the extrusion passages are arranged on the outlet side of the insertion passage. The extrusion apparatus characterized in that the plurality of linear bodies are joined together so as to be in contact with the central linear member .   Provided on the upstream side of the extruder is a rotation delivery device that sends the central linear member while rotating it in the circumferential direction, and on the downstream side of the extruder, while rotating in synchronization with the rotation delivery device, The extrusion apparatus of Claim 10 provided with the rotary winding apparatus which winds this after forming the said linear body in the outer periphery of the said center linear member with an extruder.   The extrusion apparatus of Claim 10 or 11 which provided the die | dye whose exit shape is a rectangular shape so that it may rotate synchronizing with the said center linear member at the exit of the said extruder.

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