JP3787772B2 - High viscosity melt coating composition coated core wire extrusion head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an electric wire coating extrusion, and more particularly to a high viscosity molten coating composition coated core wire extrusion head in which a high viscosity material such as a piezo element material is extruded around a core wire.
[0002]
[Prior art]
  Piezoelectric materials are materials that generate voltage when vibration is applied. Piezoelectric ceramics and polymer piezoelectric materials are well known. The former includes ceramics such as lead zirconate titanate, and the latter includes There is uniaxially stretched polyvinylidene fluoride (PVDF). A cord-like pressure sensor is known as one that utilizes this characteristic. The cord-like pressure sensor is a soft and slender string with a thickness of about 2.5mm, and it is laid around the power window of automobiles and the outer periphery of automated guided vehicles running in factories, warehouses and hospitals to prevent accidents. It is used by laying on the fence at the boundary of the site for intrusion detection. Regardless of which part of this elongated string is bent or which part is slightly touched by foreign matter, that part It is a convenient sensor that can output a change in pressure as an electrical signal.
[0003]
  FIG. 4 shows the configuration of a cord-like pressure sensor using a coated core wire that is the subject of the present invention.
  In the figure, reference numeral 40 denotes a cord-like pressure sensor, which has a core wire (core electrode) 41 at the center in the axial direction, a piezo element material 42 covered around the core electrode 41, and a piezo element material 42 around the piezo element material 42. The shield electrode 43 is wound, and the outermost periphery is covered with PVC (vinyl chloride resin) 44. The present invention is directed to an extrusion head in which a core wire 41 is coated with a piezo element material 42. The cord-like pressure sensor 40 uses a resin-based material having a heat resistance that is uniquely developed by the applicant and can be used up to 120 ° C. for a composite piezoelectric body. It can be used in a temperature range higher than 90 ° C. (120 ° C. or lower), which is the maximum operating temperature of vinylidene fluoride) or a composite piezoelectric material (composite piezoelectric material of chloroprene and piezoelectric ceramic powder). The composite piezoelectric body is composed of a flexible resin and a piezoelectric ceramic, and is composed of a flexible electrode composed of a coiled metal core electrode and a film-shaped outer electrode, which is as flexible as a normal vinyl cord. It has sex.
[0004]
  Further, the cord-like pressure sensor 40 is as sensitive as a polymer piezoelectric body, and has a sensitivity as high as that of a polymer piezoelectric body in a low frequency region (10 Hz or less) in which pinching of a human body is detected. . This is because the relative dielectric constant (about 55) of the composite piezoelectric material is larger than that of the polymer piezoelectric material (about 10), so that the decrease in sensitivity is small even in the low frequency region (10 Hz or less).
[0005]
  High heat-resistant composite piezoelectric material (piezoelectric material composed of two different materials) is composed of a composite of resin-based material and piezoelectric ceramic powder of 10 μm or less, with vibration detection characteristics made of ceramic, and flexibility is resin Each has been realized. This composite piezoelectric body is made of a high heat resistance (120 ° C.) by combining an amorphous polyethylene resin (molecular weight of about 300,000) and an amorphous polyethylene resin (molecular weight of about 100,000) as a resin material. ) And a simple manufacturing process that does not need to be crosslinked.
[0006]
  The cord-like pressure-sensitive sensor 40 obtained in this way does not have piezoelectric performance when the piezoelectric body is molded, so a DC high voltage of several kV / mm is applied to the piezoelectric body.
Therefore, it is necessary to perform a process for imparting piezoelectric performance to the piezoelectric body (polarization process). This polarization process is performed by forming electrodes on both sides of the composite piezoelectric body and then applying a DC high voltage to both electrodes. When a minute defect such as a crack is inherent in the composite piezoelectric body, it becomes easy to short-circuit between the two electrodes by discharging at the defect portion, so that a sufficient polarization voltage cannot be applied. By establishing a unique polarization process using an auxiliary electrode that can be brought into close contact with the piezoelectric body, it is possible to detect and avoid defects and stabilize the polarization, thereby enabling a length of several tens of meters.
[0007]
  In the cable sensor, a coiled metal core electrode is used for the inner electrode, and a film electrode (aluminum-polyethylene terephthalate-aluminum three-layer laminate film) is used for the outer electrode. In addition, the external lead wire can be easily connected, and a flexible cable-like mounting configuration is possible. The core electrode is a copper-silver alloy coil, the outer electrode is a three-layer laminate film made of aluminum-polyethylene terephthalate-aluminum, the piezoelectric body is polyethylene resin + piezoelectric ceramic powder, the outer skin is thermoplastic, and the relative dielectric constant is 55, the charge generation amount is 10-13C (coulomb) / gf, and the maximum use temperature is 120 ° C.
[0008]
  FIG. 5 shows a conventional extrusion head of this type, wherein (a) is a longitudinal sectional view and (b) is a side view. In the figure, 50 is an extrusion head, 51 is a melt coating composition pumping section, 511 is a land section, 512 is a cap nut, 52 is a die ring, 521 is a die presser ring, 522 is a thickness adjustment bolt, and 523 is a presser. A bolt, 53 is a nipple, 54 is a die block, 55 is a mandrel, 56 is a nip holder, 561 is a wire guide, 562 is a thickness adjusting ring, 563 is a gap adjusting nut, and 57 is a composition temperature sensor.
[0009]
  Next, the operation of this conventional apparatus will be described. First, the core wire W is guided linearly from the wire guide 561 on the left side of the figure, and from there, the passages of the mandrel 55 and the nipple 53 are moved in a straight line to the right side of the figure and exit from the outlet of the die ring 52. On the other hand, a piezoelectric composite material composed of piezoelectric ceramic powder and synthetic rubber is heated by a heating device (not shown) from the upper melt-coating composition pressure feeding unit 51 in the figure and is melted in a land by a pressure feeding mechanism (not shown) such as a screw. The outside of the core W is passed through the gap 541 between the inner surface of the die block 54 and the outer surface of the nipple 53 and the nipple holder 56 through the passage of the part 511 and the passage of the mandrel 55 (not shown). It goes out from the exit part of the die ring 52 while covering (covering part C).
[0010]
[Problems to be solved by the invention]
  As can be seen from the cross-sectional view of the die ring 52, the internal shape of the die ring 52 of the conventional apparatus has a tapered shape that becomes narrower as it advances in the direction of travel so that the molten coating composition does not stay. It has become. It was thought that this funnel-shaped composition would prevent the molten coating composition from staying in the hollow part and could be smoothly pumped.ThisThe other shapes were not suitable for pumping highly viscous compositions. In other words, if it is not highly viscous and has a low viscosity composition or fluid liquid, there is no need for a taper shape. For example, even a vertical wall in the traveling direction such as a syringe can be smoothly pumped. Anyone thinks that it can be done, but this taper is an essential premise for devices that extrude highly viscous (so-called hard) compositions such as pressure-sensitive sensor materials, and this is the ultimate shape. In the present situation, no other shape could be considered in this technical field. And since this melt-coating composition is highly viscous, it takes time to pump, but since it is tapered, it is considered that it can be produced at a production rate of 1 m / min to obtain a coated core wire. It was.
[0011]
  By the way, the present applicant tried various experiments to further increase the production speed of 1 m / min. Experiment 1: First, in the conventional apparatus using the current specification packing, when the number of rotations of the screw was increased to a little over 3 times (7 rpm) of the normal (2 rpm), the molten coating composition did not come out from the exit portion of the die ring 52. Leaked from the flange.
[0012]
  Experiment 2: Next, after the temperature was raised in the conventional apparatus, the flange was tightened again, and the screw rotation speed was further increased to a little more than twice (14 rpm). The extrusion speed was 1.5 m / min. Furthermore, when the speed was increased, the bolt on the flange broke.
[0013]
  Experiment 3: Using a chevron copper packing in a conventional apparatus, after the temperature was raised, the flange was tightened again and the screw rotation speed was set to 2 rpm. The molten coating composition did not come out of the outlet portion of the die ring 52, but from the flange. Leaked out. The pressure sensor detected about 60 MPa.
[0014]
  Experiment 4: In the conventional apparatus, when the number of rotations of the screw was set to 2 rpm using the current specification packing and Teflon packing, the molten coating composition leaked from the flange without exiting from the outlet portion of the die ring 52. Teflon packing also protruded. The pressure sensor detected about 50 MPa.
[0015]
  Experiment 5: Using a chevron copper packing and Teflon packing in a conventional apparatus, tightening bolt tightening and rotating the screw to 4 rpm, the extrusion speed was 0.6 m / min, and the molten coating composition was in the middle No longer comes out of the exit of the die ring 52. The pressure sensor detected about 95 MPa. When the speed increased further, the bolt broke.
[0016]
  As described above, the production speed of 1 m / min is the upper limit, and when the speed is increased further, protrusion from the packing and bolt breakage occurred. The present invention solves these problems, and is to provide a cord-like coated core wire extrusion apparatus that does not cause protrusion of a molten coating composition from a packing and does not break a bolt, and can be driven at a high speed.
[0017]
[Means for Solving the Problems]
[0018]
  In order to solve the above problems, an invention of an extrusion head according to claim 1 of the present application is an extrusion head having a die ring having an outlet portion and a nipple disposed in proximity to the outlet portion, wherein the nipple Is provided with a core wire passage in the inner axial direction, the core wire is fed out from the core wire passage toward the outlet portion, and the viscous melt-coating composition is introduced into the space formed by the die ring and the nipple to the outlet portion. In the extrusion head that pushes the cord-shaped coated core wire from the die ring outlet portion while coating the viscous melt coating composition on the core wire by pumping toward the outlet, the outlet of the space constituted by the die ring and the nipple A stay reservoir that retains the viscous melt-coating composition is formed in the vicinity of the portion, and the stay reservoir forms a wall surface having the outlet portion in the traveling direction of the core wire at the outlet portion. And characterized in that obtained by forming vertically against.
With the above configuration, even if the molten coating composition is viscous, it goes to the outlet portion 122 without a large surface frictional resistance, so that high-speed production is possible, and the most simple structure retention can be obtained.
Further, according to claim 2The inventionthe aboveIn the extrusion head described above, the retention reservoir is formed by forming a wall surface having the outlet portion into a slope that becomes narrower with respect to a traveling direction of the core wire in the outlet portion, and forming the slope in a step shape. Features.
  With the above configuration,the aboveSince the retention reservoir is formed earlier than the described retention reservoir, the start-up of the operation is quickened, and the operation can be quickly brought to the steady operation.
[0019]
  According to a third aspect of the present invention, in the extrusion head according to the first or second aspect, the core wire linearly moves in the core wire passage.
  Also,The invention according to claim 4 is the invention according to claim 1.Or 2In the extrusion head described,The retention reservoir is formed in a space sandwiched between the wall surface of the die ring and the wall surface of the nipple.To do.
  Further, according to claim 5The invention is claimed in claim 1.~ 4The extrusion head according to any one of the preceding claims,WritingThe hot melt coating composition is supplied in a straight path toward the die ring.
  With the above configuration, the frictional resistance can be reduced and the production speed can be greatly increased as compared with the conventional apparatus in which the molten coating composition is supplied at a right angle.
[0020]
  Also,Claim 6The invention is characterized in that in the extrusion head according to any one of claims 1 to 4, the core wire passage in the nipple holder for fixing the nipple is a straight path.
  With the above configuration, the core wire can be disposed without interfering with the extruder, and the core wire can be extruded without applying an unnecessary load because there is no bent portion.
  Also,Claim 7The invention is characterized in that in the extrusion head according to any one of claims 1 to 4, the core wire passage in the nipple holder for fixing the nipple is a right-angled or inclined passage with respect to the core wire passage in the nipple. And
  With the above configuration, it is possible to manufacture a sensor having the same effect without complicated processing such as forming a core wire passage inside a single screw.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the present invention will be described in detail with reference to FIGS. FIG. 1 is an extrusion head according to a first embodiment of the present invention, and FIG. (B) is a side view. In FIG. 1, reference numeral 10 denotes an extrusion head according to the first embodiment of the present invention, which is based on a die block 14 having a through-hole 141 penetrating in the left-right direction in the figure, and on the left side of the figure is a molten coating composition pumping unit. 11, a die ring 12 is fixed to the right side of the figure via respective fixing members. The melt-coating composition pumping section 11 is a tubular body having a cylindrical space 111 formed in the length direction therein, and is connected to the through-hole 141 of the die block 14 at the front end in the traveling direction (right side in the figure). A single screw 16 also serving as a nipple holder is inserted into the cylindrical space 111. The uniaxial screw 16 fixes the nipple 13 at the front end in the traveling direction, and a spiral blade 164 is formed on the surface thereof, and the molten coating composition present in the cylindrical space 111 is advanced by the rotation of the uniaxial screw 16 ( Go to the right in the figure). In addition, a core wire passage 161 is formed in the inside of the single screw 16 through which the core wire W passes in the length direction according to the first embodiment of the present invention. The outer shape of the nipple 13 fixed to the front end of the single screw 16 is conical at the front end and cylindrical at the rear end, and a core wire passage 131 through which the core wire W passes in the length direction is formed. The core wire passage 161 is connected.
[0022]
  The die ring 12 has a cap shape having a recessed space 121 inside, and an outlet portion 122 communicating with the recessed space 121 and the outside is opened at the center in the axial direction. The outlet portion 122 is disposed close to the tip of the core wire passage 131 of the nipple 13. In the figure, a pressure sensor 18 and a resin temperature sensor 17 are attached from the top and bottom of the die block 14 toward the center, and the pressure and temperature of the molten coating composition at the through-hole 141 are detected.
[0023]
  The operation of the extrusion head 10 configured as described above is as follows.
  The core wire is guided from the left side of the drawing to the core wire passage 161 formed inside the single screw 16 and linearly moves in the core wire passage 161, passes through the core wire passage 131 of the nipple 13, and from the opening of the nipple 13. It exits from the outlet 122 of the die ring 12 through the recessed space 121 inside the die ring 12. With the above configuration, the core wire is guided by the core wire passage 161 inside the single screw 16 and moves linearly. Therefore, the moving core wire W can be arranged without interfering with the extruder. Since the bent portion is eliminated, coating extrusion can be performed without applying an unnecessary load.
[0024]
  On the other hand, the high-viscosity coating composition (piezoelectric composite material comprising piezoelectric ceramic powder and synthetic rubber) is in a molten state heated to near 100 ° C. by a heater heating device (not shown), and in the cylindrical space 111 from the left side in the figure. Are fed into the space with the outside of the single screw 16. Since the single screw 16 rotates in the cylindrical space 111, it is pumped forward (right side) by the spiral blade 164 formed on the surface thereof, and finally reaches the recessed space 121 inside the die ring 12. . In the recessed space 121, the cord-shaped coated core wire centering on the core wire comes out from the outlet portion 122 while covering the core wire W coming out from the opening of the nipple 13. Thus, the conventional apparatus has not been able to linearly pump the high-viscosity molten coating composition. That is, in the conventional apparatus, since the melt coating composition was supplied at a right angle, the frictional resistance in the vicinity of the right angle was large, but in the present invention, the friction resistance was increased by linearly supplying the high-viscosity melt coating composition. And high-speed pumping became possible.
[0025]
  Furthermore, the present invention is characterized in that the wall surface having the outlet portion 122 of the die ring 12 is perpendicular to the traveling direction of the core wire W in the outlet portion 122 in each embodiment. As can be seen by comparing this with the internal shape of the die ring 52 of the conventional apparatus in FIG. 5, the conventional apparatus has a funnel shape that becomes narrower as it advances in the direction of travel so that the molten coating composition does not stay. However, the difference here is that the melt coating composition is actively retained. Thus, by making the wall surface having the exit part 122 vertical, the high-viscosity molten coating composition that has entered the corners is in a state where it has entered a “retention pool” that cannot proceed or retreat further. . Detailed analysis of the action and effect of this reservoir will be left to a later scholar's study, but according to the present applicant's current understanding, in the case of a funnel, a highly viscous melt coating composition toward the outlet 122 is used. It is assumed that most of the objects move while contacting the funnel-like surface, and the frictional resistance on the surface increases, so that the progress will be slow. On the other hand, in the case of a wall surface (in the present invention) extending at right angles to the traveling direction of the core wire, the high-viscosity molten coating composition toward the outlet portion 122 is not in contact with the wall surface but is accumulated in a reservoir. Since it moves while in contact with the composition, it is considered that the friction is not so great and high speed is possible. Incidentally, when compared with the die ring 52 (FIG. 5) of the conventional apparatus 50, the speed can be significantly increased from 5 m to 12 m / min with respect to the conventional extrusion speed of 1 m / min.
[0026]
  FIG. 3 lists the retention reservoirs of various configurations formed on the die ring 32.
(A) to (c) are deep pan types, of which (a) is a right angle type, (b) is a curved type, (c) is an obtuse angle type, (d) and (e) are colosseum (amphitheater) types Of these, (d) is a right-angle type and (e) is a curved type. In the die ring 321 of FIG. 3 (a), by making the wall surface 1a having the outlet portion perpendicular to the traveling direction of the core wire, the high-viscosity molten coating composition that has reached the wall surface 1a also retreats further. It is in a state of entering a so-called “retention pool” (a part indicated by a set of points in the figure) that cannot be performed. As a result, it is considered that the high-viscosity molten coating composition pumped from the direction of the arrow moves toward the outlet portion while contacting the same composition that is staying in the staying reservoir without moving toward the staying reservoir.
[0027]
  In the die ring 322 of FIG. 3 (b), the wall surface 2a having the exit portion is curved to form a retention reservoir (a portion indicated by a set of points in the drawing) that is more easily retained. As a result, the high-viscosity molten coating composition that has been pumped from the direction of the arrow can move at a high speed to the outlet while contacting the same composition that does not stay.
[0028]
  In the die ring 323 of FIG. 3 (c), the wall surface 3a having the outlet portion is made an obtuse angle (inclined to the right in the drawing) with respect to the traveling direction of the core wire, so that the composition reached here becomes the outlet portion. It becomes a state where it has entered a “retention pool” (a part indicated by a set of points in the figure) that is more difficult to move. As a result, it is considered that the high-viscosity molten coating composition pumped from the direction of the arrow moves to the outlet portion while being in contact with the same composition in the retention reservoir without moving toward the retention reservoir.
[0029]
  In the die ring 324 of FIG. 3 (d), the retention reservoir is formed earlier than the retention reservoirs of FIG. 3 (a) to FIG. Therefore, the start-up of the operation becomes faster, and it can be brought to steady operation earlier.
[0030]
  In the die ring 325 of FIG. 3 (e), the wall surface 5a having the outlet portion is formed as a curved colosseum, thereby forming a retention reservoir that is more difficult to move to the outlet portion than the retention reservoir of FIG. 3 (d). The
[0031]
  FIG. 2 shows a nipple portion of an extrusion head according to the second embodiment of the present invention. 2A is a cross-sectional view taken along line AA in FIG. 2B, FIG. 2B is a side view, FIG. 2C is a cross-sectional view taken along line BB in FIG. 2A, and FIG. Is a plan view. In FIG. 2A, reference numeral 24 denotes a tubular die block, which has a through-hole 241 penetrating in the left-right direction in the figure, and a die ring 22 is fixed to the right side of the die block 24, and the left side of the die block 24. Although not shown, there is the same single screw as described in FIG. 1, and the melt coating composition is pumped by rotation of the single screw.
[0032]
  In the vicinity of the center of the through hole 241 in the length direction, a connecting portion 242 that connects the tube walls through the center of the tube is provided. A nipple 23 is fixed on the right side of the connecting portion 242, and the left side is closed with a plug 26. The width of the connecting portion 242 in the radial direction (see FIG. 4C) is narrow, so that the through holes 241 have passages (241a and 241b in FIG. 2C) on both sides of the connecting portion 242. Therefore, in FIG. 2 (a), the passage 241c that is the arrival space of the melt coating composition and the 241d that is the die ring side space exist on the side path of the connecting portion 242 (FIG. 2 (a) on the front side and the back side of the paper surface). ), And the molten coating composition reaching the left side of the die block 24 can move to the die ring 22 side.
[0033]
  The nipple 23 includes a through hole 231 that passes through the center in the axial direction and a radial hole that communicates with the through hole 231. On the other hand, the connecting portion 242 of the die block 24 is provided with a die block passage 243 that communicates with the outside of the die block and the radial hole of the nipple 23, and the radial hole of the die block passage 243 and the nipple 23 is provided. The core wire W is supplied to the nipple through hole 231 from the outside via the, and further goes out of the die ring 22 through the outlet portion 222 of the die ring 22. As described above, the second embodiment of the present invention is characterized in that the core wire W is supplied at a right angle to the nipple 23, and this configuration forms the core wire passage 161 (FIG. 1) inside the single screw 16. Thus, it is possible to manufacture a sensor having the same effect without complicated processing. Here, the core wire W is supplied at a right angle to the nipple 23, but it may of course be supplied obliquely to the nipple 23.
[0034]
  Other features are the same as those of the first embodiment. That is, the highly viscous melt-coating composition is linearly pumped and a retention reservoir is formed. As described above, the linear pumping of the high-viscosity molten coating composition was not present in the conventional apparatus. By supplying the high-viscosity molten coating composition linearly according to the present invention, the frictional resistance is reduced and the high speed Pumping is possible. Further, the retention reservoir is formed as follows. The die ring 22 has a cap shape, and an outlet 222 that communicates with the outside is opened in the cap outer wall 221. The cap outer wall 221 having the outlet portion 222 of the die ring 22 is perpendicular to the traveling direction of the core wire W at the outlet portion 222, so that a reservoir is formed at the corner. And this exit part 222 is arrange | positioned at the front-end | tip of the core wire channel | path 231 of the nipple 23 in close proximity. Although not shown, a pressure sensor and a resin temperature sensor are attached from the top and bottom of the die block 24 toward the center, and the pressure and temperature of the molten coating composition in the through hole 241 are detected.
[0035]
  The operation of the extrusion head of FIG. 2 as described above is as follows.
  The core wire W is supplied from the passage 243 of the die block 24 to the nipple through hole 231, and further goes out of the die ring 22 through the outlet portion 222 of the die ring 22. On the other hand, the molten coating composition is pumped to the left space 24C in the die block 24 in a molten state heated to near 100 ° C. by a heater heating device (not shown), and finally passes through the side paths 241a and 241b (FIG. 2C). It reaches the right space 241d of the die ring 12. In the right space 241d of the die ring 12, a cord-shaped covered electric wire centering on the core wire comes out from the outlet portion 222 while covering the core wire W coming out of the nipple 23. At that time, as in the first embodiment, the “retention reservoir” of the present invention is perpendicular to the traveling direction of the core wire W so that a retention reservoir is formed at the corner. The contained composition cannot be advanced or retreated further, and the highly viscous melt-coated composition that has been pumped cannot go to the stagnation reservoir. While moving to the exit at high speed. The manufacturing speed according to the second embodiment of the present invention is 5 m to 12 m / min, and the speed can be significantly increased as compared with the conventional apparatus.
[0036]
【The invention's effect】
  As described above, according to the present invention, there is provided an extrusion head having a die ring having an outlet portion and a nipple disposed in proximity to the outlet portion, and the nipple has a core wire passage in the inner axial direction. A space formed by the die ring and the nipple, and extending the core wire from the core wire passage toward the outlet portion.StickyBy feeding the melt-adhesive coating composition toward the outlet,WritingIn the extrusion head for extruding the cord-coated core wire from the die ring outlet while coating the heat-resistant melt coating composition, the front of the space formed by the die ring and the nipple is in the vicinity of the outlet.WritingForming a retention reservoir for retaining the heat-resistant molten coating composition, and the retention reservoir is configured to suspend a wall surface having the outlet portion with respect to a traveling direction of the core wire at the outlet portion.directlySince it was formed, even if the melt coating composition is highly viscous, it goes to the outlet without a large surface frictional resistance, so that high-speed production becomes possible. Also,StickySince the hot melt coating composition is fed to the die ring by a straight path, the friction resistance can be reduced and the production speed can be reduced as compared with the conventional apparatus which feeds the melt coating composition at a right angle. It can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an extrusion head according to a first embodiment of the present invention.
FIG. 2 is a view for explaining a nipple portion of an extrusion head according to a second embodiment of the present invention.
FIG. 3 is a view for explaining retention pools of various configurations formed on the die ring 32;
FIG. 4 is a diagram showing a configuration of a cord-type pressure sensitive sensor using a coated core wire that is an object of the present invention.
FIG. 5 is a view for explaining a conventional extrusion head of this type.
[Explanation of symbols]
  10. Extrusion head according to the first embodiment of the present invention
  11 Molten coating composition pumping section
  111 Cylindrical space
  121 Recessed space
  122 Exit
  13 Nipple
  131 core wire passage
  141 Through-hole
  14 die block
  16 single screw
  161 Core wire passage
  17 Resin temperature sensor
  18 Pressure sensor 18
  22 Die ring
  221 Cap outer wall
  222 Exit
  23 Nipple
  231 Core wire passage through hole
  24 Tubular die block
  241 Through hole
  242 connecting part
  243 Die Block Passage
  26 stoppers

Claims (7)

An extrusion head having a die ring having an outlet portion and a nipple disposed in proximity to the outlet portion, the nipple having a core wire passage in an axial direction inside the nipple, from the core wire passage to the outlet portion. feeding the core wire toward, by pumping the viscous melt coating composition in the space formed by the die ring and said nipple toward said outlet section, covering the front Kineba hotmelt coating composition to said core wire formed in the extrusion head for extruding a cord-shaped coated core wire die ring outlet, residence sump to stay in front Kineba hotmelt coating composition to the outlet in the vicinity of the space formed by the die ring and said nipple while and, extrusion head, characterized in that said retention reservoir are those formed by vertical formed directly wall having the outlet to the direction of movement of the core wire in the outlet portion. An extrusion head having a die ring having an outlet portion and a nipple disposed in proximity to the outlet portion, the nipple having a core wire passage in an axial direction inside the nipple, from the core wire passage to the outlet portion. feeding the core wire toward, by pumping the viscous melt coating composition in the space formed by the die ring and said nipple toward said outlet section, covering the front Kineba hotmelt coating composition to said core wire formed in the extrusion head for extruding a cord-shaped coated core wire die ring outlet, residence sump to stay in front Kineba hotmelt coating composition to the outlet in the vicinity of the space formed by the die ring and said nipple while The retaining reservoir is formed by forming the wall surface having the outlet portion into a slope that narrows with respect to the traveling direction of the core wire in the outlet portion, and forming the slope in a step shape. Extrusion head is characterized. The extrusion head according to claim 1 or 2, wherein the core wire moves linearly in the core wire passage. The retention reservoir is formed in a space sandwiched between a wall surface of a die ring and a wall surface of a nipple. 1 Or the extrusion head of 2. Before Kineba hotmelt coating composition according to claim 1 any one extrusion head according 4, characterized in that provided in a linear path toward the die ring. The extrusion head according to any one of claims 1 to 4 , wherein a core wire passage in the nipple holder for fixing the nipple is a straight passage toward the die ring . The extrusion head according to any one of claims 1 to 4 , wherein a core wire passage in the nipple holder for fixing the nipple is a passage perpendicular to or inclined with respect to the core wire passage in the nipple.

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