JP6664705B2 - Method and apparatus for manufacturing bead - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a flexible long bead having a core material, which is attached to various household articles, vehicle interior parts, and other members.

  2. Description of the Related Art Conventionally, as disclosed in, for example, Patent Document 1, an elongated bead has flexibility and is decoratively attached to various products. The bead is composed of a bead body having a circular cross section made of, for example, transparent polyurethane, and a leg portion integrally formed from the bead body. In particular, in recent years, in order to increase the decorativeness of the bead, a decorative yarn which is a core material such as a lame yarn is inserted along the longitudinal direction in a transparent bead body integrally and coaxially and integrally. Proposed. The decorative yarn is extruded coaxially and integrally with the bead body by insert molding. The decorative yarn inside is visible from the outside of the resin of the transparent bead body and enhances the decorativeness of the bead.

JP 2015-43918 A

  The bead disclosed in Patent Document 1 described above, in which a decorative yarn such as a lame yarn is inserted coaxially and integrally, the decorative yarn at the center is a twisted yarn, It has a torque due to internal stress in the direction of returning to the twisting direction, and in the state where it is molded as a long ball, the ball is twisted, which may hinder installation work to various products . Furthermore, the lame yarn, which is a twisted yarn, contains a small amount of water, and the water evaporates due to the heat during molding, and bubbles are formed at the center of the bead. In addition, due to the moisture contained in the decorative yarn and the form of the decorative yarn, the adhesiveness between the resin of the ball body and the surface of the decorative yarn is low. In some cases, the resin of the bead body peeled off, blocking the transmission of light and deteriorating the design.

  The present invention has been made in view of the above-mentioned problems of the background art, and has a twisted decorative yarn having no twist, and a decorative yarn in a ball body, even if the decorative yarn has a strong twist. It is an object of the present invention to provide a method and an apparatus for manufacturing a bead having no peeling of bubbles and no generation of bubbles.

  The present invention provides a long ball body having flexibility, a leg portion provided in a long shape integrally with the ball body, and formed in a band shape along a side surface of the ball body, A method of manufacturing a bead provided with a decorative yarn integrally inserted into a bead body, a sending step of sending out the decorative yarn at a predetermined tension from a spool around which the decorative yarn is wound, A heat setting step of heating the fed decorative yarn while applying the predetermined tension to stabilize the shape, and integrally molding a thermoplastic resin around the decorative yarn after the heat setting step And forming a bead by forming the bead.

  The heat setting step is performed by passing the decorative yarn between a pair of heating plates. The thermoplastic resin in the molding step is formed so that at least a part of the bead body is transparent and the decorative yarn inside is visible.

  Further, the present invention is a manufacturing apparatus for manufacturing a bead in which a decorative yarn is integrally inserted into a center portion of a bead body, wherein the decorative yarn is supported by a spool around which a long decorative yarn is wound. A yarn feeding device for feeding the decorative yarn, a guide roll for adjusting the tension of the sent decorative yarn and guiding the travel of the decorative yarn, a heat setting device for heating the decorative yarn, and the heat setting device. An apparatus for manufacturing a bead including an extruder for forming the bead by inserting the decorative yarn having a stabilized shape into a central portion.

  The heat setting device includes a pair of heating plates, and the decorative yarn is provided so as to be able to pass between the pair of heating plates. The pair of heating plates of the heat setting device are provided at intervals at which the decorative yarn can pass in contact therewith.

  The yarn feeding device may include a drying device for drying the decorative yarn wound on the spool in advance.

  ADVANTAGE OF THE INVENTION According to the manufacturing method of the bead of this invention, even if it is a bead formed by inserting a twisted decorative yarn such as a lame yarn, there is no twist, and storage and mounting work to various products are easy. . Furthermore, there is no peeling of the decorative yarn in the bead body and no generation of bubbles near the decorative yarn, the design of the bead is good, and the design is deteriorated even when the bead is strongly curved when attached to various products. Nothing.

  Further, according to the manufacturing apparatus of the present invention, a bead having good design can be easily manufactured by a simple apparatus with a simple process.

It is a schematic diagram showing a manufacturing device of one embodiment of the present invention. It is a longitudinal section which shows the attachment state of the bead of this embodiment. It is a partially broken perspective view of the bead of this embodiment.

  Hereinafter, a manufacturing apparatus and a manufacturing method of the bead 10 according to an embodiment of the present invention will be described with reference to FIGS. First, the bead 10 manufactured by the manufacturing apparatus 30 of this embodiment will be described below. As shown in FIGS. 2 and 3, the bead 10 is integrally formed of a thermoplastic resin, and has a bead body 12 having flexibility and a substantially circular cross section, and a belt-shaped body in the longitudinal direction of the bead body 12. And a leg portion 14 integrally formed with the leg portion. In the center of the circular cross section of the bead body 12, a decorative yarn 16 having a twist, such as a lame yarn, is inserted integrally and substantially concentrically along the longitudinal direction.

  The bead body 12 is a transparent portion 12a formed of a transparent resin up to a position slightly closer to the leg 14 than the center of the circular cross section, and the decorative yarn 16 is formed so as to be visible from the outside. , Enhances the design. The portion other than the transparent portion 12a of the bead body 12 and the legs 14 are provided as colored portions 12b colored in an inconspicuous color such as black, and are formed integrally with the transparent portion 12a. The leg portion 14 is formed in a strip shape having a thickness smaller than the diameter of the bead body 12, and is a portion to be attached to various members such as a car seat to be described later.

  The bead body 12 and the legs 14 use a transparent resin for the transparent portion 12a, and the other colored portions 12b and the legs 14 are decorative yarns formed by two-color molding using a resin colored in a desired color. 16 and are integrally formed.

  The thermoplastic resin used for the bead 10 is preferably a transparent or translucent material having a light transmissive property while imparting flexibility to the bead body 12 and the legs 14. A thermoplastic resin mixed with a colorant is used as a resin for molding the resin. Specifically, a polyurethane resin, a polyvinyl chloride (PVC) resin, a polyester resin, and an olefin resin, which are thermoplastic resins that can be extruded, can be used. In particular, since the polyurethane resin has heat resistance, Preferred as a material.

  As shown in FIGS. 2 and 3, the decorative yarn 16 is, for example, a lame yarn. The lame yarn is a yarn formed by twisting a flat yarn obtained by thinly cutting a polyethylene terephthalate (PET) film on which aluminum or the like is vapor-deposited, around a core yarn made of a synthetic fiber yarn. The lame yarn serving as the decorative yarn 16 has various structures but can be appropriately selected. The decorative yarn 16 may be other than the lame yarn.

  There are various members to which the bead 10 can be attached. Here, an example in which the member is attached to a seat cover 20 of a car seat will be described with reference to FIG. The seat cover 20 is formed three-dimensionally by sewing the skin pieces 21, 22, etc., which are a plurality of parts. Here, an example will be described in which the bead 10 is integrally sewn to a seam portion between the skin piece 21 and the skin piece 22. The skin pieces 21 and 22 cover the seat cushion 24 of the seat, and are formed in a shape that covers the upper surface 24a and the side surface 24b of the seat cushion 24. The bezel 10 is located near a corner between the upper surface 24a and the side surface 24b of the seat cushion 24.

  Each of the skin pieces 21 and 22 is sewn with a sewing thread 26 with its edge portions sandwiching the leg portion 14 of the bead 10. The bead 10 is arranged in the longitudinal direction along the edge of the skin pieces 21 and 22, and is sewn with a sewing thread 26 at a portion of the leg 14 near the bead body 12. In this state, the bead body 12 is exposed from between the skin pieces 21 and 22, and the leg portion 14 is located between the skin pieces 21 and 22 and does not appear on the surface.

  Next, a manufacturing apparatus 30 and a manufacturing method of the bead 10 according to this embodiment will be described with reference to FIG. The manufacturing device 30 of this embodiment includes a yarn feeder 34 that supports a spool 32 around which a decorative yarn 16 such as a lame yarn is wound, and guide rolls 35 and 36 that guide the running of the fed decorative yarn 16. It has. Further, a heat setting device 38 for heating the decorative yarn 16 sent from the guide roll 36 to stabilize the form is provided, and the bead 10 is extruded and formed on the downstream side in the feeding direction of the heat setting device 38 (not shown). An extruder 40 including a resin extruder and an extrusion die 40a is provided.

  The yarn feeding device 34 includes a drying device 31 that previously dries the decorative yarn 16 of the spool 32 in the housing 34a with dry air. The spool 32 is provided so that the tension of the decorative yarn 16 can be controlled to a predetermined value by a tension control mechanism 33 that is provided on the rotation axis of the spool 32. Guide rolls 35 and 36 are provided downstream of the spool 32, and a tension control mechanism 37 is provided on the rotation axis of the guide roll 36, and controls the tension of the decorative yarn 16 to a predetermined value. Here, if the tension applied to the decorative yarn 16 by the tension control mechanisms 33 and 37 is too weak, the twisting force of the decorative yarn 16 itself during transportation of the decorative yarn 16 by the manufacturing apparatus 30 in FIG. As a result, the decorative yarn 16 is untwisted. Due to this untwisting, the decorative yarn 16 in the middle of conveyance cannot maintain a straight line state, and a problem such as forming a loop portion and being caught by the conveyance guide members such as the guide rolls 35 and 36 occurs. On the other hand, if the tension applied to the decorative yarn 16 by the tension control mechanisms 33 and 37 is too strong, the decorative yarn 16 is integrally molded with the resin in an extended state, and the decorative yarn 16 tends to contract. This causes a problem that the bead 10 is warped beyond the target allowable range. In other words, the tension of the predetermined value applied by the tension control mechanisms 33 and 37 is a tension greater than a tension at which a loop-shaped portion is formed in the decorative yarn 16 during conveyance due to the twisting force of the decorative yarn 16 itself. In addition, it means a tension smaller than a tension that causes the bead 10 to warp beyond a target allowable range due to expansion and contraction of the decorative yarn 16 after being integrally molded with the resin. The decorative yarn 16 is wound around the guide roll 36 so as to make one round, but the arrangement of the decorative yarn 16 and the guide rolls 35 and 36 and the number of the guide rolls 35 and 36 can be appropriately set. .

  The heat setting device 38 includes a pair of heating plates 38a and 38b, and is provided so that the decorative yarn 16 can pass through a slight gap between the heating plates 38a and 38b. The length of the heating plates 38a and 38b is set as appropriate, and is set, for example, to a length of 1 m to several m, preferably 1.5 m to 2.5 m. Heaters (not shown) are provided in the heating plates 38a and 38b, and the surface temperature is 120 ° C. to 240 ° C., and preferably 200 ° C., at which the decorating yarn 16 can be dried and stabilized without adversely affecting the decorating yarn 16. It is set to about 230 ° C. It is sufficient that the decorative yarn 16 can pass between the heating plates 38a and 38b without resistance. Preferably, the decorative yarn 16 is provided so as to pass while contacting any one of the heating plates 38a and 38b. .

  The extrusion device 40 includes an extrusion die 40 a provided with an extrusion hole in the shape of the bead 10, a transparent resin forming the transparent portion 12 a of the bead 10 from both sides of the extrusion die 40 a, a colored portion 12 b, and a leg 14. Is extruded and cast to form two colors.

  The method of manufacturing the bead 10 using the manufacturing device 30 includes a sending step of sending the decorative yarn 10 from the yarn sending device 34, the decorative yarn 16 is sent out from the spool 32 at a constant tension, and the guide roll 35, After passing through 36, it is sent to a heat setting process by a heat setting device 38 while adjusting the tension. At this time, the decorative yarn 16 is dried to some extent in advance in a delivery step in the yarn delivery device 34. In the heat setting step performed by the heat setting device 38, the heat is sent between the heating plates 38a and 38b at a predetermined feed speed, for example, a speed of about 5 m / s to 10 m / s, and the heat is applied by the heat from the heating plates 38a and 38b. The water in the yarn 16 is reliably evaporated and dried. Furthermore, by heating the decorative yarn 16 in a state where the above-described predetermined tension is applied, the internal stress of the decorative yarn 16 is removed, the form is stabilized, and the torque that causes twisting or the like is eliminated.

  After the heat setting step by the heat setting device 38, the decorative yarn is sent to the step of forming the bead 10. The bead 10 is formed while controlling the tension and the position of the decorative yarn 16 so that the decorative yarn 16 of the bead 10 is located substantially in the center of the bead body 12a and in the transparent portion 12a. . At this time, the transparent resin for the transparent portion 12a of the two-color molding is poured into the extrusion die 40a so as to wrap the decorative yarn 16, and the colored resin for the leg portion 14 and the coloring portion 12b is formed by the extrusion die 40a. Cast from the other side of the At this time, each resin is cast so that the decorative yarn 16 is located in the transparent portion 12a and the colored portion 12b and the leg portion 14 are formed of a colored resin.

  According to the method and the apparatus for manufacturing a bead of the embodiment of the present invention, the bead 10 is formed by inserting a decorative yarn 16 having a high twist, such as a lame yarn, into the transparent portion 12a of the bead 10 to be integrally formed. Also, the long bead 10 has no twist, is easy to handle, and can be easily stored and attached to various products. Further, the moisture remaining in the decorative yarn 16 in the bead body 12 is evaporated and removed by the heat setting device 38, so that no bubbles are generated in the transparent portion 12a. There is no peeling between the ball and the decorative yarn 16, the appearance of the bead body 12 is good, and the design is good. Further, since the appearance is not deteriorated even when the curved portion is largely bent, the device can be easily attached to various products and has a wide application range.

  The method and apparatus for manufacturing a bead of the present invention are not limited to the above-described embodiment, and the decorative yarn to be applied is preferably a lame yarn. Any type can be used as long as it is possible. The color of the bead body is also transparent or translucent, and any color can be used as long as the decorative yarn inside is visible, and the degree of translucency does not matter. In addition, the length and temperature of the heat setting device are appropriately set depending on the material and state of the decorative yarn to be applied, and the internal stress of the decorative yarn is removed well within a range that does not significantly deteriorate the decorative yarn. Any material that can remove the torque that causes twisting or the like may be used.

REFERENCE SIGNS LIST 10 bead 12 bead body 12 a transparent portion 12 b coloring portion 14 leg 16 decorative thread 20 seat cover 30 manufacturing device 31 drying device 32 spool 33, 37 tension control mechanism 34 thread feed device 35, 36 guide roll 38 heat setting device 38a, 38b Heating plate 40 Extruder 40a Extrusion die

Claims (7)

A long and flexible bead body (12), which is provided in a long shape integrally with the bead body (12), and is formed in a strip along the side surface of the bead body (12). A method for manufacturing a bead (10) comprising a leg (14) and a decorative yarn (16) integrally inserted into the bead body (12),
Sending out the decorative yarn (16) with a predetermined tension from a spool (32) around which the decorative yarn (16) is wound;
A heat setting step of heating the sent decorative yarn (16) while applying the predetermined tension;
Forming a bead (10) by integrally forming a thermoplastic resin around the decorative yarn (16) that has undergone the heat setting step.   The method for manufacturing a bead according to claim 1, wherein the heat setting step is performed by passing the decorative yarn (16) between a pair of heating plates (38a, 38b).   The manufacturing of the bead according to claim 1 or 2, wherein the thermoplastic resin in the forming step is formed such that at least a part of the bead body (12) is transparent and the decorative yarn (16) inside is visible. Method. A manufacturing apparatus (30) for manufacturing a bead (10) in which a decorative yarn (16) is integrally inserted into a center portion of a bead body (12),
A yarn feeding device (34) that supports a spool (32) around which a long decorative yarn (16) is wound and feeds the decorative yarn (16), and a tension of the sent decorative yarn (16). A guide roll (35, 36) for adjusting and guiding the travel of the decorative yarn (16), a heat setting device (38) for heating the decorative yarn (16), and the heat setting device (38) An apparatus for manufacturing a bead, comprising an extruding device (40) for forming the bead (10) by inserting the decorative yarn (16) having a stabilized shape into a central portion.   The said heat setting apparatus (38) is provided with a pair of heating plates (38a, 38b), The said decorative yarn (16) is provided so that it can pass between the pair of heating plates (38a, 38b). 4. The apparatus for manufacturing a bead according to 4.   The apparatus for manufacturing a bead according to claim 5, wherein the pair of heating plates (38a, 38b) of the heat setting device (38) are provided at intervals at which the decorative yarn (16) can pass through by contact. .   The apparatus according to claim 4, wherein the yarn feeding device (34) has a drying device for drying the decorative yarn (16) wound on the spool (32) in advance.

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