JP4117849B2 - Weatherstrip manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a weather strip in which opposing ends of a weather strip material having elastically deformable strip portions are joined together.

  For example, a weather strip attached along a door opening edge of a vehicle is integrally formed with an elastically deformable hollow seal portion in a mounting portion attached to a flange provided along the door opening edge. There is one that seals the gap between the door and the door opening edge. In such a weather strip, a weather strip corresponding to the shape of a mounting location such as a door opening edge may be manufactured by joining ends of one or a plurality of weather strip materials extruded.

As a method of manufacturing this weather strip, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2004-130552), one or a plurality of weather strip material terminals are held by holding molds, respectively. These terminals are pressed against each other with the joining sheet material in between. There is one in which the joining sheet member is heated in this state and the ends of the weather strip material are joined to each other with the joining sheet material (for example, vulcanization joining).
JP 2004-130552 A (second page, etc.)

  However, in the above-described conventional manufacturing method, when the ends of the weather strip material held by the holding mold are pressed together with the bonding sheet material interposed therebetween, the sealing strip portion such as a hollow seal portion is joined at the bonding portion. There may be a gap between the outer surface and the inner surface of the holding mold. For this reason, the seal strip portion is joined in a state where a gap is generated between the outer surface of the seal strip portion and the inner surface of the holding mold (that is, the outer surface of the seal strip portion is recessed). A step may be formed on the outer surface of the joint portion. Alternatively, a part of the joining sheet material enters (leaks) into the gap between the outer surface of the seal strip portion and the inner surface of the holding mold, and burrs are generated on the outer surface of the joint portion of the seal strip portion, Projections may occur on the outer surface. When a step or a burr occurs on the outer surface of the joint portion of the seal strip portion, the weather strip is attached to the door opening edge of the vehicle, and when the door is closed and the back surface of the door is in elastic contact with the outer surface of the seal strip portion, A minute gap is formed between the outer surface and the back surface of the door at the step or protruding burr portion, and the sealing performance of the joint portion of the seal strip portion is deteriorated, or the appearance of the joint portion of the seal strip portion is deteriorated. There is a fear.

  Such a problem can also occur when the ends of the weatherstrip material made of thermoplastic synthetic resin are joined by heating and melting. That is, if a gap is generated between the outer surface of the seal strip portion and the inner surface of the holding mold at the joint portion, a step may be formed on the outer surface of the joint portion of the seal strip portion, or the outer surface of the seal strip portion. This is because a part of the molten resin enters (leaks) in the gap between the inner surface of the holding mold and a burr may be generated on the outer surface of the joint portion.

  The present invention has been made in consideration of these circumstances. Therefore, the object of the present invention is to prevent steps and burrs from occurring at the joint portion of the strip portion of the weatherstrip material. It is an object of the present invention to provide a method for manufacturing a weather strip that can prevent deterioration in sealing performance at a joint portion and improve appearance.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the ends of one or a plurality of long-sized thermoplastic synthetic resin weather strip materials having elastically deformable strip portions are heated and melted together. A method of manufacturing a weather strip in which the end faces of one piece are joined to each other, wherein a pair of holding dies for holding the end of the weather strip material are arranged facing each other so as to be able to approach and separate from each other. An end face positioning member for positioning the end face is arranged to be movable between a position protruding between the opposed faces of the pair of holding molds and a position retracted from between the opposed faces. A movable mold having a holding surface for holding the one part and a fixed mold are provided to be openable and closable, and at least one of the opposing surfaces of the pair of holding molds projects toward the other. Using a joining device in which a cutting blade is provided along the end of the holding surface, the end face positioning member protrudes between the opposed surfaces of the pair of holding dies, and the end surfaces of the weather strip material are opened with the holding dies open. A step of setting the weatherstrip material to a fixed mold so that the end surface of the strip portion is slightly protruded from the cutting edge of the cutting blade by contacting the end surface with the end surface positioning member, and a pair of holding molds In the closed state, a negative pressure lower than atmospheric pressure is generated between the outer surface of the strip portion and the holding surface, so that the outer surface of the strip portion is adsorbed to the holding surface and the strip portion is attached to the holding mold. A negative pressure applying step for immovably fixing, a heating step for heating the opposing ends of the weather strip material held by the pair of holding dies to a state where they can be fused, and a space between the opposing surfaces of the pair of holding dies From end face positioning part And a pair of holding molds are brought close to each other in a state where negative pressure is generated between the outer surface of the strip portion and the holding surface, and the ends of the strip portion are pressed against each other. A compressive force is applied to the terminal in the longitudinal direction so that the end faces of the strip portions are fused together, and the resin protruding outside the strip portion is cut along the outer surface of the strip portion with a cutting blade, or A joining step of forming a cut in the resin and a removal step of opening the holding mold after releasing the negative pressure and taking out the weather strip material to which the strip portion is joined are performed from the holding mold.

  In this manufacturing method, a negative pressure is generated between the outer surface of the strip portion and the holding surface, the outer surface of the strip portion is attracted to the holding surface, and the strip is maintained in substantially the same shape as the holding surface. The end surfaces of the parts can be bonded by heat fusion. Thereby, it can prevent that a level | step difference arises in the outer surface of the junction part of a strip part, and a part of resin temporarily softened by heating enters between the outer surface of a strip part and a holding surface (leaks). Thus, there is no step on the outer surface of the joint portion of the strip portion, and the occurrence of burrs can be prevented. In addition, a negative pressure is generated between the outer surface of the strip portion and the holding surface, and the end portions of the strip portion are heat-sealed with each other in a state where the strip portion is fixed to the holding mold so as not to move. Since it can join, even if the longitudinal compression force acts on a strip part at a joining process, it can prevent that a strip part shifts. Accordingly, an appropriate compressive force can be applied to the joining sheet material to obtain a good joined state, and it is possible to prevent the occurrence of rubbing scratches associated with the displacement of the strip portion.

  Moreover, when the strip portion is formed in a substantially tube shape as in claim 3, the hollow portion in the strip portion is higher than the atmospheric pressure in a state where the ends of the strip portion are pressed against each other. By generating a positive pressure, the outer surface of the strip portion may be crimped to the holding surface and the strip portion may be fixed to the holding mold so as not to move. In this way, a positive pressure is generated in the hollow portion in the strip portion, and the outer surface of the strip portion is crimped to the holding surface to maintain substantially the same shape as the holding surface, and the strip portion is made a holding mold. On the other hand, since the end faces of the strip portions can be bonded by heat fusion in a state where they are fixed so as to be immovable, substantially the same effect as in the first aspect can be obtained.

  In addition, although Claim 1 and Claim 3 mentioned above may each be implemented independently, both are combined and a negative pressure is applied between the outer surface of the strip portion and the holding surface as in Claim 2. In addition to the generation, the end surfaces of the strip portions may be bonded by heat fusion in a state where a positive pressure is generated in the hollow portion in the strip portion. Thereby, it can prevent more reliably that a level | step difference and a burr | flash generate | occur | produce on the outer surface of the junction part of a strip part.

  Further, when negative pressure is generated between the outer surface of the strip portion and the holding surface, as in claim 4, suction holes are formed at a plurality of locations on the holding surface of the holding mold, and air is passed through the suction holes. The negative pressure may be generated between the outer surface of the strip portion and the holding surface. If it does in this way, the outer surface of a strip part can be adsorb | sucked in several places of a holding surface, and the adsorption | suction fixation of a strip part can be performed stably.

  Alternatively, as in claim 5, the holding surface of the holding mold is made of a porous material, and negative pressure is generated between the outer surface of the strip portion and the holding surface by sucking air through the porous material. You may make it let it. If it does in this way, the outer surface of a strip part can be adsorb | sucked with the whole holding surface, and the adsorption | suction fixation of a strip part can be performed still more stably.

  Further, in the setting step, when the weather strip material is set in the fixed mold so as to be in a predetermined setting position (a position where the end surface of the strip portion slightly protrudes from the cutting edge of the cutting blade), as in claim 6 In addition, the weather strip material is fixed so that both holding dies are brought close to each other so that the end face positioning member is sandwiched between the opposing surfaces of the pair of holding dies, and the end surface of the weather strip material is set back from the cutting edge of the cutting blade. The weather strip material may be set at a predetermined set position by sliding the weather strip material in the direction of the end surface positioning member in the state of being placed on the mold and bringing the end surface of the weather strip material into contact with the end surface positioning member. good. In this way, the weather strip material can be easily and accurately set at a predetermined setting position.

  Alternatively, as in claim 7, the end surface positioning member protrudes between the opposing surfaces of the pair of holding molds to separate the both holding molds, and the end surface of the weatherstrip material is in a position protruding from the cutting edge of the cutting blade. In such a state that the weather strip material is arranged on the fixed mold, the pair of holding molds are moved close to each other so that the end surface of the weather strip material contacts the end surface positioning member, and the end surface of the weather strip material contacts the end surface positioning member. The weatherstrip material may be moved backward relative to the holding mold and set at a predetermined position by moving the holding mold closer to the holding mold. Even in this case, the weather strip material can be easily and accurately set at the predetermined setting position.

  According to another aspect of the present invention, the cutting blades are formed on both opposing surfaces of the pair of holding molds, and the resin protruding outside the strip portion along the outer surface of the strip portion is disposed on both sides in the thickness direction. You may make it cut | disconnect with a cutting blade. In this way, since the resin protruding to the outside of the strip portion can be cut at the same time by being sandwiched by cutting blades from both sides in the thickness direction, the cutting is biased toward one side of the resin when cutting the resin. The force does not act and the resin can be cut accurately.

  According to a ninth aspect of the present invention, the weather strip material is made of a thermoplastic elastomer resin, and is attached to the attached portion, a strip portion protruding from the attached portion to form a seal portion, and the attached portion And a sealing lip that seals a gap between the mounting portion and the mounting portion, and in the joining step, all the end surfaces of the mounting portion, the strip portion, and the sealing lip are joined. If it does in this way, all the end surfaces of the attachment part of a weather strip raw material, a strip part, and a seal lip can be heat-seal | fused and it can join firmly.

  In this case, as in the tenth aspect, the strip portion and the seal lip may be formed of a foamed thermoplastic elastomer resin. If it does in this way, moderate softness | flexibility can be given to the strip piece part and seal lip which make a seal part.

  Further, in the heating step, the end surface of the weather strip material is melted by bringing the hot plate heated to a temperature higher than the melting temperature of the synthetic resin forming the weather strip material into contact with the end surface of the weather strip material. You may do it. If it does in this way, it can be made to melt in the state where the end surface of the weather strip material was maintained in the flat surface with the hot plate brought into contact with the end surface of the weather strip material.

  Hereinafter, the best mode for carrying out the present invention will be described using three Examples 1 to 3.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the weather strip 12 mounted along the edge of the back door opening of the vehicle body panel 11 is a terminal of one or a plurality of long weather synthetic strips 13 made of thermoplastic synthetic resin. It is configured in a ring shape or a ring shape by melting and heating them together.

  As shown in FIG. 2, the weather strip material 13 is formed by extrusion molding of a thermoplastic synthetic resin such as TPE (thermoplastic elastomer resin), a mounting portion 15 having a substantially U-shaped cross section, and an elastically deformable and substantially tubular shape. A hollow seal portion 16 (strip portion) made of foamed TPE (foamed TPE) is integrally formed, and a reinforcing fishbone-like core material 17 formed of a metal plate or the like is inserted in the attachment portion 15. It is buried by molding. A plurality of holding lips 20 that protrude inward are integrally formed on the inner peripheral surfaces of the vehicle outer side wall 18 and the vehicle inner side wall 19 of the mounting portion 15.

  When the flange 21 provided along the back door opening edge of the vehicle body panel 11 is covered with the mounting portion 15 of the weather strip 12, the holding lip 20 is elastically deformed so that the flange 21 is sandwiched from both the inside and outside of the vehicle. The weather strip 12 is attached to the flange 21. When the back door 22 is closed, the back door 22 abuts against the hollow seal portion 16 and elastically deforms the hollow seal portion 16, so that a gap between the back door 22 and the vehicle body panel 11 is sealed by the hollow seal portion 16. It is like that. The hollow seal portion 16 is integrally formed with a vehicle interior seal portion 16a that makes a substantial seal in contact with the back door 22, and a support portion 16b that is located outside the vehicle and elastically supports the vehicle interior seal portion 16a. ing.

  A seal lip 23 made of foamed TPE (foamed TPE) protruding toward the vehicle exterior is integrally formed on the outer peripheral surface of the vehicle exterior side wall 18 of the mounting portion 15. When the weather strip 12 is attached to the flange 21, the seal lip 23 is elastically deformed and comes into contact with the base side of the flange 21, so that the gap between the mounting portion 15 and the flange 21 is sealed with the seal lip 23. It has become.

  Further, on the outer peripheral surface of the vehicle interior side wall 19 of the attachment portion 15, a shielding lip 24 made of foamed TPE that protrudes toward the vehicle interior and whose tip is curved toward the attachment portion 15 is formed integrally. When 12 is mounted on the flange 21, a terminal of an interior member (not shown) of the vehicle is inserted between the shielding lip 24 and the attachment portion 15. When the weather strip 12 is attached to the flange 21, the foamed TPE is softer than the hollow seal portion 16 and the seal lip 23 between the vehicle outer side wall 18 and the vehicle inner side wall 19 of the mounting portion 15. The seal belt 25 is preferably formed.

  The weather strip material 13 has a hollow seal portion 16, a seal lip 23, and a shielding lip 24 formed of foamed TPE material having innumerable minute holes and flexibly flexing, and other portions (the attachment portion 15 and the holding lip). 20) is made of a TPE solid (non-foamed TPE) material having higher hardness and rigidity than the above foamed TPE material.

Next, the weather strip 12 manufacturing apparatus 26 (weather strip material 13 joining apparatus) will be described with reference to FIGS.
As shown in FIG. 3, in the weather strip 12 manufacturing apparatus 26, a pair of holding molds 27 for holding the ends of the weather strip material 13 slide along the guide rails 28 toward and away from each other. They are arranged so as to face each other. Each holding mold 27 (lower mold 32) is connected to a cylinder rod 30 of an air cylinder 29, and both holding molds 27 (lower mold 32) move closer to each other (slide movement in the approaching direction) by the air cylinder 29 or It moves apart (sliding in the direction of separation).

  Each holding mold 27 is provided with an upper mold 31 (movable mold), a lower mold 32 (fixed mold), and a middle mold 33 that can be opened and closed. The upper mold 31 of each holding mold 27 is connected to the cylinder rod 35 of the air cylinder 34, and the air cylinder 34 moves the upper mold 31 upward to open the holding mold 27 and moves downward. Thus, the holding mold 27 is moved between a closed position and a closed position. A frame 32a is fixed to the lower mold 32 of each holding mold 27, and an air cylinder 34 is attached to a frame 32b fixed to the upper part of the frame 32a. Thereby, each upper mold | type 31 can be moved to approach or separate from each lower mold | type 32 integrally.

  In addition, a positioning recess 36 for the closest approach is formed in the lower part of the opposing surface of each holding mold 27 (lower mold 32), and between the positioning recesses 36 of each holding mold 27, the uppermost of both holding molds 27 are formed. A positioning stopper 37 for determining the approach position is disposed.

  As shown in FIGS. 4 and 5, on the inner surface of the upper mold 31 of each holding mold 27, the outer surface of the weather strip material 13 on the outside of the vehicle (the support portion 16b of the hollow seal portion 16, the mounting portion 15, the seal lip 23, etc. The outer mold holding surface 38 for holding the outer surface of the weather strip material 13 is formed in substantially the same shape as the outer surface shape of the weather strip material 13 on the outer side of the vehicle. On the other hand, on the inner surface of the lower mold 32 of each holding mold 27, the outer surface of the weather strip material 13 on the inner side of the vehicle (the inner surface of the hollow seal portion 16 and the outer surface of the inner side of the vehicle such as the shielding lip 24) is held. The lower mold holding surface 39 is formed in substantially the same shape as the outer surface shape of the weather strip material 13 on the vehicle inner side.

  In addition, a first convex portion 40 and a second convex portion 41 for holding the attachment portion 15 of the weather strip material 13 are provided at the distal end portion of the middle die 33 of each holding die 27, and the first convex portion 40 is attached to the holding die 27. The second convex portion 41 is inserted between the mounting portion 15 and the shielding lip 24 so as to be inserted into the inner peripheral side of the portion 15. Each middle mold 33 is pivotally attached to the front side of the lower mold 32 via a hinge 42, and is closed between the upper mold 31 and the lower mold 32 (the position shown in FIG. 4), and the lower mold. 32 can be rotated and moved between an open position (a position shown in FIG. 5) retracted forward of 32.

  Further, as shown in FIG. 5, the opposing surfaces of the holding dies 27 are cut with pointed tips for cutting the resin that protrudes outside the weather strip material 13 along the outer surface of the weather strip material 13. A blade 44 is provided along the end of the upper mold holding surface 38 and the end of the lower mold holding surface 39. On the outer peripheral side of the cutting blade 44, there is provided a recess 45 for receiving the outer peripheral portion (protruding portion) of the cut resin. As shown in FIGS. It protrudes from the bottom by a predetermined dimension (for example, 0.3 to 0.7 mm) (in other words, the bottom of the recess 45 is recessed from the cutting edge of the cutting blade 44 by a predetermined dimension).

  As shown in FIGS. 6 and 7, in the weather strip 12 manufacturing apparatus 26, an end surface positioning member 46 for positioning the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) slides in the vertical direction. It is arranged to be movable. The end surface positioning member 46 is connected to the cylinder rod 48 of the air cylinder 47, and the air cylinder 47 moves the end surface positioning member 46 upward to project between the opposing surfaces of the lower mold 32 of each holding mold 27. (Position shown in FIG. 6) and a sliding position (position shown in FIG. 7) that moves downward and retracts from between the opposing surfaces of the lower mold 32 of each holding mold 27. .

  A holding mold positioning surface 49 for determining the approach position of each holding mold 27 (lower mold 32) is provided on both surfaces of the lower portion of the end surface positioning member 46, and both surfaces of the upper portion of the end surface positioning member 46 are provided. Further, an end face positioning surface 50 for positioning the end face of the weather strip material 13 (at least the end face of the hollow seal portion 16) is provided. The thickness dimension t2 of the end surface positioning surface 50 is set to be smaller than the thickness dimension t1 of the holding mold positioning surface 49. Further, a positioning convex portion 51 is formed on the opposing surface of each holding die 27 (lower die 32), and the tip position of the positioning convex portion 51 substantially coincides with the cutting edge of the cutting blade 44, or the cutting blade 44 It is set so as to protrude by a slightly smaller dimension (for example, 0.05 to 0.1 mm) than the cutting edges to prevent contact between the cutting edges.

  Further, a heater 43 for heating the end surface positioning member 46 is built in at least the upper portion of the end surface positioning member 46 (the portion where the end surface positioning surface 50 is provided), and the end surface positioning member 46 heated by the heater 43. The upper portion of the plate also serves as a hot plate, and the end of the weather strip material 13 is heated and melted by the heat of the upper portion (hot plate) of the end face positioning member 46 in the heating step described later.

  As shown in FIG. 6, in a state where the end face positioning member 46 is moved to the protruding position, the holding molds 27 (lower molds 32) are moved closer to each other, and the positioning convex portions 51 of the respective holding molds 27 (lower molds 32). Is brought into contact with the holding die positioning surface 49, and a gap of a predetermined dimension G (for example, 0.1 to 2.0 mm) is formed between the cutting edge of the cutting blade 44 of each holding die 27 and the end face positioning surface 50. Is set to As a result, when the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) is brought into contact with the end surface positioning surface 50, the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) becomes the cutting blade 44. It protrudes by a predetermined dimension G (for example, 0.1 to 2.0 mm) from the cutting edge.

  Further, as shown in FIG. 7, in the state where the end face positioning member 46 is moved to the retracted position, the holding mold 27 (lower mold 32) is moved closer to the positioning recess of each holding mold 27 (lower mold 32). When the 36 is brought into the closest position where it is brought into contact with the positioning stopper 37, the cutting edges of the cutting blades 44 of each holding mold 27 are in light contact with each other, or a slight gap is formed between the cutting edges of the cutting blades 44. Is set to Thus, when the holding dies 27 are brought to the closest position, the cutting edges of the cutting blades 44 of the holding dies 27 can be prevented from strongly colliding with each other and being damaged or worn.

  Further, as shown in FIG. 4, suction holes 52 are formed at a plurality of locations in the upper mold holding surface 38 and the lower mold holding surface 39 of each holding mold 27, and the suction holes 52 of the holding surfaces 38, 39 are Each is connected to a first negative pressure supply path 53 formed along the holding surfaces 38 and 39. Each first negative pressure supply path 53 is connected to one collective negative pressure supply path 55 via a second negative pressure supply path 54 and a flexible flexible pipe 54a. The passage 55 is connected to one negative pressure pump 56 (a negative pressure generating source such as a vacuum pump). The air strip material in each holding die 27 is sucked through the suction holes 52 by sucking air between the outer surface of the weather strip material 13 in each holding die 27 and the holding surfaces 38 and 39 by this single negative pressure pump 56. A substantially identical negative pressure lower than the atmospheric pressure is generated between the 13 outer surfaces and the holding surfaces 38 and 39. The suction holes 52 are preferably formed as close as possible to the facing surface of the holding mold 27 (for example, a position of 0.3 to 1.5 mm from the facing surface of the holding mold 27).

  The collective negative pressure supply passage 55 is provided with an on-off valve 57. When the on-off valve 57 is opened, the holding mold 27 side of the collective negative pressure supply passage 55 communicates with the negative pressure pump 56 side. When the valve is closed, the holding mold 27 side of the collective negative pressure supply path 55 communicates with the atmosphere. The on-off valve 57 is composed of an electromagnetic valve and is controlled to be opened and closed by a control device (not shown).

  Further, as shown in FIG. 7, the upper mold 31 of each holding mold 27 is provided with an air blowing pipe 58 so as to protrude from the upper mold holding surface 38, and when each holding mold 27 is closed (each upper mold 31). When the mold 31 is moved to the closed position), the tip of the injection needle 58 of the air blowing tube 58 of each holding mold 27 is the outside of the hollow seal portion 16 of the weather strip material 13 (the portion of the support portion 16b). The insertion hole 59 is formed so as to protrude into the hollow portion in the hollow seal portion 16. The air blowing pipe 58 of each holding mold 27 is connected to one collective positive pressure supply path 61 via a positive pressure supply path 60 such as a flexible flexible pipe. Two positive pressure pumps 62 (compressors) are connected. By supplying air through the air blowing pipe 58 to the hollow portion in the hollow seal portion 16 in each holding mold 27 with this single positive pressure pump 62, the hollow portion in the hollow seal portion 16 in each holding die 27 is greatly increased. Almost the same positive pressure higher than the atmospheric pressure is generated.

  The collective positive pressure supply path 61 is provided with an on-off valve 63. When the on-off valve 63 is opened, the holding mold 27 side of the collective positive pressure supply path 61 communicates with the positive pressure pump 62 side. When the valve 63 is closed, the holding mold 27 side of the collective positive pressure supply path 61 communicates with the atmosphere. Further, the positive pressure supply path 60 of each holding mold 27 is provided with an opening / closing valve 64. When the opening / closing valve 64 is opened, the holding mold 27 side of the positive pressure supply path 60 communicates with the positive pressure pump 62 side. When the open / close valve 64 is closed, the holding mold 27 side of the positive pressure supply path 60 communicates with the atmosphere. Each on-off valve 63, 64 is composed of an electromagnetic valve, and is controlled to open and close by a control device (not shown).

Next, a method for manufacturing the weather strip 12 (a method for joining the weather strip material 13) will be described.
When manufacturing the weather strip 12 (joining the weather strip material 13), first, a weather strip material 13 made of thermoplastic synthetic resin cut to a predetermined length after extrusion molding is prepared, and each weather strip material 13 is prepared. The core material 17 of the terminal portion is removed by about 1 to 3 mm. Further, the upper portion (hot plate) of the end surface positioning member 46 of the manufacturing apparatus 26 is preheated by the heater 43, and the temperature of the upper portion of the end surface positioning member 46 is slightly lower than the melting temperature of TPE or the like that forms the weather strip material 13. Raise to low temperature.

  Thereafter, the setting process is executed. In this setting step, the upper mold 31 of each holding mold 27 is moved to the open position and the middle mold 33 of each holding mold 27 is moved to the open position as shown in FIG. The holding mold 27 is opened by rotating. Thereafter, the weather strip material 13 is set at a predetermined set position of the lower mold 32 of each holding mold 27 by either of the following methods (A) or (B). Here, the predetermined set position is a position where the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) protrudes from the cutting edge of the cutting blade 44 by a predetermined dimension G (for example, 0.1 to 2.0 mm) (FIG. 6). Reference).

  (A) First, as shown in FIG. 5, the first projecting portion 40 and the second projecting portion 41 of the middle mold 33 of each holding mold 27 are respectively covered with the attachment portion 15 and the shielding lip 24 of the end of the weather strip material 13. Then, the weather strip material 13 is set on the middle mold 33. At this time, the weather strip material 13 is arranged so that the end surface of the weather strip material 13 is in a position retracted from the cutting edge of the cutting blade 44. Thereafter, the middle mold 33 of each holding mold 27 is pivotally moved to the closed position, and the end of the weather strip material 13 is set on the lower mold holding surface 39 of each holding mold 27.

  Thereafter, as shown in FIG. 6, the end face positioning member 46 is slid to the protruding position, and the end face positioning member 46 is disposed between the opposing surfaces of the holding molds 27 (lower mold 32), and then each holding mold is placed. 27 is moved closer, and the positioning projection 51 of each holding mold 27 (lower mold 32) is brought into contact with the holding mold positioning surface 49. Thereafter, the weather strip material 13 is slid in the direction of the end surface positioning member 46 so that the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) is brought into contact with the end surface positioning surface 50. Is set at a predetermined set position. As a result, the weather strip material 13 can be easily and accurately set at a predetermined setting position.

  (B) First, as shown in FIG. 5, the first projecting portion 40 and the second projecting portion 41 of the middle mold 33 of each holding mold 27 are respectively covered with the attaching portion 15 and the shielding lip 24 of the end of the weather strip material 13. Then, the weather strip material 13 is set on the middle mold 33. At this time, the weather strip material 13 is disposed so that the end surface of the weather strip material 13 protrudes from the cutting edge of the cutting blade 44 by a dimension larger than the predetermined dimension G. Thereafter, the middle mold 33 of each holding mold 27 is pivotally moved to the closed position, and the end of the weather strip material 13 is set on the lower mold holding surface 39 of each holding mold 27.

  Thereafter, as shown in FIG. 6, the end face positioning member 46 is slid to the protruding position, and the end face positioning member 46 is disposed between the opposing surfaces of the holding molds 27 (lower mold 32), and then each holding mold is placed. 27, the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) is brought into contact with the end surface positioning surface 50, and the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) is moved to the end surface. By moving each holding mold 27 close to the positioning mold 51 until the positioning convex portion 51 of each holding mold 27 (lower mold 32) contacts the holding mold positioning surface 49 while being in contact with the positioning surface 50, the weather strip material 13 is lowered. Retreat relative to the mold 32 and set at a predetermined position. Even in this case, the weather strip material 13 can be easily and accurately set at the predetermined setting position.

  After execution of the setting step, the step of operating the air cylinder 34 to advance the cylinder rod 35 and moving the upper die 31 of each holding die 27 to the closed position to bring each holding die 27 into a closed state is executed. At this time, the tip of the injection needle 58 of the air blowing tube 58 of each holding mold 27 pierces the outside of the hollow seal portion 16 of the weatherstrip material 13 (the portion of the support portion 16b) and enters the inside of the hollow seal portion 16. Project into the hollow part.

  Thereafter, the negative pressure applying step is executed. In this negative pressure application step, the open / close valve 57 of the collective negative pressure supply path 55 is opened and the negative pressure pump 56 is operated in a state where the holding dies 27 are closed. The air between the outer surface of the weather strip material 13 in each holding mold 27 and the holding surfaces 38, 39 is sucked through the suction holes 52 by this one negative pressure pump 56, so that the weather strip material in each holding mold 27. Almost the same negative pressure is generated between the 13 outer surfaces and the holding surfaces 38 and 39. Due to this negative pressure, the outer surface of the weather strip material 13 (the outer surface of the hollow seal portion 16, the seal lip 23, the shielding lip 24, etc.) is attracted to the holding surfaces 38, 39 and is maintained in substantially the same shape as the holding surfaces 38, 39. At the same time, the weather strip material 13 (hollow seal portion 16, seal lip 23, shielding lip 24, etc.) is fixed to the holding mold 27 so as not to move.

  At this time, the weather strip material 13 is adsorbed by adsorbing the outer surface of the weather strip material 13 (the outer surfaces of the hollow seal portion 16, the seal lip 23, the shielding lip 24, etc.) by the suction holes 52 formed at a plurality of locations on the holding surfaces 38 and 39. 13 (hollow seal part 16, seal lip 23, shielding lip 24, etc.) can be stably adsorbed and fixed.

  Then, a heating process is performed. In this heating step, the end surface positioning member 46 is heated by the heater 43 in a state where the end surface of the weather strip material 13 is in contact with the upper portion (hot plate) of the end surface positioning member 46, so that the upper portion of the end surface positioning member 46 is heated. Is raised to a temperature at which the end of the weather strip material 13 can be heated and melted (a temperature exceeding the melting temperature of TPE or the like forming the weather strip material 13), whereby the weather strip material 13 held by each holding mold 27 is increased. The terminals facing each other are heated and melted so that they can be fused. As a result, the end surface of the weather strip material 13 can be melted with the upper surface (hot plate) of the end surface positioning member 46 in contact with the end surface of the weather strip material 13 kept flat. After performing this heating process, the process of sliding the end surface positioning member 46 to the retracted position to retract the end surface positioning member 46 from between the opposing surfaces of the holding dies 27 is performed.

  In addition, you may make it perform the process which retracts a heating process and the end surface positioning member 46 before execution of a negative pressure provision process. Alternatively, the heating process may be started before the negative pressure application process, and the end surface positioning member 46 may be retracted after the negative pressure application process.

  Then, a joining process is performed. In this joining step, as shown in FIG. 7, each holding mold 27 is moved close to the weather strip material in a state where negative pressure is generated between the outer surface of the weather strip material 13 and the holding surfaces 38 and 39. The 13 terminals are pressed against each other.

  Further, a portion of the hollow seal portion 16 of each weather strip material 13 that is slightly away from the holding mold 27 is stopped with a pinch (not shown) to close the hollow, and the weather strip material 13 (hollow seal portion 16) is closed. In a state where the terminals are pressed against each other, the on-off valve 63 of the collective positive pressure supply path 61 and the on-off valve 64 of each positive pressure supply path 60 are opened and the positive pressure pump 62 is operated. By sending air through the air blowing pipe 58 to the hollow portion in the hollow seal portion 16 in each holding mold 27 by this single positive pressure pump 62, the hollow portion in the hollow seal portion 16 in each holding die 27 is almost filled with the air. Generate the same positive pressure. With this positive pressure, the outer wall is pressed against the holding surfaces 38 and 39 by pressing the inner wall of the hollow seal portion 16 outward, so that the shape is maintained substantially the same as the holding surfaces 38 and 39 and the hollow seal portion 16 is held. The mold 27 is fixed so as not to move.

  In this way, a negative pressure is generated between the outer surface of the weather strip material 13 and the holding surfaces 38 and 39 and a positive pressure is generated in the hollow seal portion 16 of the weather strip material 13 so that the outer surface of the hollow seal portion 16 is In a state of being in close contact with the holding surfaces 38 and 39 of the holding mold 27, the holding molds 27 are moved closer to each other, and the positioning recesses 36 of the holding molds 27 are brought into contact with the positioning stoppers 37 to be in the closest approach positions. As a result, the ends of the weather strip material 13 are pressed against each other, and a compressive force is applied to the ends of the weather strip material 13 in the longitudinal direction. 20, end faces of the hollow seal portion 16, the seal lip 23, the shielding lip 24, etc.) are bonded together by heat fusion. At this time, since the outer surface of the hollow seal portion 16 is in close contact with the holding surfaces 38 and 39 of the holding mold 27, the outer surface of the hollow seal portion 16 and the holding surface 38, even if a part of the molten resin at the joining portion flows. 39 is prevented from entering (leaking out) from the space 39.

  Furthermore, by setting each holding mold 27 to the closest position, the resin protruding outside the weather strip material 13 is cut along the outer surface of the weather strip material 13 at the cutting edge of the cutting blade 44. At this time, by cutting the resin protruding outside the weather strip material 13 from both sides in the thickness direction with the cutting blades 44 at the same time, a cutting force biased toward one side of the resin is applied when the resin is cut. Therefore, the resin can be cut accurately.

  Thereafter, the negative pressure pump 56 is stopped, and the open / close valve 57 of the collective negative pressure supply path 55 is closed to introduce the atmosphere into each negative pressure supply path 54, whereby the outer surface and the holding surface 38 of the weather strip material 13. , 39 is released. Further, by stopping the positive pressure pump 62 and closing the on-off valve 63 of the collective positive pressure supply path 61 and the on-off valve 64 of each positive pressure supply path 60 to introduce the atmosphere into each positive pressure supply path 60, The positive pressure in the hollow seal portion 16 is released.

  The negative pressure and the positive pressure are released and maintained for a predetermined time to cool and solidify the joint portion of the weather strip material 13, so that the end surface of the weather strip material 13 (attachment portion 15, holding lip 20, hollow seal portion 16). The end surfaces of the sealing lip 23, the shielding lip 24, etc.) are firmly joined together. In addition, you may make it cancel | release negative pressure and positive pressure after only predetermined time passes.

  After the joining process is executed, an extraction process is executed. In this extraction step, while the negative pressure and the positive pressure are released, the upper mold 31 of each holding mold 27 is moved to the open position, and the middle mold 33 of each holding mold 27 is rotated to the open position. The holding mold 27 is opened. Thereafter, the weather strip material 13 in which all end surfaces of the attachment portion 15, the holding lip 20, the hollow seal portion 16, the seal lip 23, the shielding lip 24, etc. are firmly joined is taken out from the holding die 27. Thereby, the production of the weather strip 12 in which the ends of the weather strip material 13 are joined together is completed.

  In the above manufacturing method, the end surface positioning member 46 incorporates the heater 43 and the end surface positioning member 46 is used as a heat plate. However, the end surface positioning member 46 is a heat plate provided separately from the end surface positioning member 46. You may make it the state which heat-melts the terminal which the raw material opposes and can be fuse | melted. Hereinafter, the manufacturing method in the case where the hot plate is provided separately from the end face positioning member 46 will be described, but mainly the portions different from the manufacturing method will be described.

  The hot plate provided separately from the end face positioning member 46 is always heated to a temperature exceeding the melting temperature of TPE. And after performing the setting process, the upper mold 31 of each holding mold 27 is moved to the closed position and the holding mold 27 is closed, and then the holding molds 27 are moved away from each other. Then, the step of sliding the end surface positioning member 46 to the retracted position to retract the end surface positioning member 46 from between the opposing surfaces of the holding dies 27 (between the end surfaces of the weather strip material 13) is executed.

  Thereafter, in the heating step after the negative pressure applying step, a hot plate that has been heated to a temperature higher than the melting temperature of TPE in advance is placed between the opposing surfaces of each holding mold 27 (between the end surfaces of the weather strip material 13). ), The respective holding dies 27 are moved close to each other, and the end surfaces of the weather strip materials 13 are held in contact with the hot plate, so that the weather strip materials 13 held by the respective holding dies 27 are held. The facing terminals are heated and melted so that they can be fused. After the heating process is performed, a process of retracting the hot plate from between the opposing surfaces of the holding dies 27 (between the end surfaces of the weather strip material 13) is performed. Then, a joining process is performed.

  In the first embodiment described above, when joining the ends of the weather strip material 13, a negative pressure is generated between the outer surface of the weather strip material 13 and the holding surfaces 38 and 39 of the holding mold 27, and this negative pressure is generated. The outer surface of the weather strip material 13 (the outer surfaces of the hollow seal portion 16, the seal lip 23, the shielding lip 24, etc.) is attracted to the holding surfaces 38, 39 by the pressure to maintain substantially the same shape as the holding surfaces 38, 39, and is hollow. A positive pressure is generated in the hollow portion in the seal portion 16, and the outer surface of the hollow seal portion 16 is pressure-bonded to the holding surfaces 38 and 39 by this positive pressure, and is maintained in the same shape as the holding surfaces 38 and 39. The end surfaces of the strip material 13 are bonded by heat fusion. As a result, it is possible to prevent a step from occurring on the outer surface of the joint portion of the hollow seal portion 16 and to allow a part of the molten resin to enter (leak) between the outer surface of the hollow seal portion 16 and the holding surfaces 38 and 39. It is possible to prevent the occurrence of burrs on the outer surface of the joint portion of the hollow seal portion 16. Therefore, when the weather strip 12 is mounted on the vehicle door opening edge or the like, and the door is closed and the rear surface of the door is brought into elastic contact with the outer surface of the hollow seal portion 16, the deterioration of the sealing performance of the joint portion of the hollow seal portion 16 is prevented. And the appearance of the joint portion can be improved.

  Moreover, the hollow seal portion 16 cannot be moved relative to the holding mold 27 by the negative pressure generated between the outer surface of the weather strip material 13 and the holding surfaces 38 and 39 and the positive pressure generated in the hollow seal portion 16. In a fixed state, the end faces of the hollow seal portion 16 can be bonded by heat-sealing, so that the hollow seal portion 16 is retained even if a longitudinal compressive force acts on the hollow seal portion 16 in the bonding step. 27 can be prevented from being displaced. As a result, an appropriate compressive force can be applied to the end faces of the hollow seal portion 16 to obtain a good joined state, and the occurrence of rubbing scratches associated with the displacement of the hollow seal portion 16 can also be prevented.

  In the first embodiment, the predetermined setting position when the weather strip material 13 is set on each holding mold 27 is determined by the end surface of the weather strip material 13 (at least the end surface of the hollow seal portion 16) from the cutting edge of the cutting blade 44. Since it is set as the position which protrudes only by the dimension G (for example, 0.1-2.0 mm), it can join in the state which carried out the compression deformation of the terminal of the hollow seal part 16 to the longitudinal direction at the joining process. As a result, the end surface of the hollow seal portion 16 is not a flat surface perpendicular to the longitudinal direction due to variations in the shape of the end surface (cut surface) of the hollow seal portion 16, and the end surfaces are parallel to each other with high accuracy. Even if it does not exist, the whole end surface of the hollow seal part 16 can be mutually adhere | attached, and the whole end surface of the hollow seal part 16 can be favorably joined.

  In the first embodiment, a negative pressure is generated on the outer surface of the weather strip material 13 and a positive pressure is generated in the hollow seal portion 16. However, a negative pressure is generated on the outer surface of the weather strip material 13. Thus, positive pressure may not be generated in the hollow seal portion 16. Alternatively, a positive pressure may be generated in the hollow seal portion 16 so that a negative pressure is not generated on the outer surface of the weather strip material 13. In any case, it is possible to prevent a step or a burr from being generated on the outer surface of the joined portion of the hollow seal portion 16, to prevent the sealing performance of the joined portion of the hollow seal portion 16, and to improve the appearance.

  Embodiments 2 and 3 of the present invention will be described below with reference to FIGS. However, parts that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and the description thereof is simplified. Mainly, differences from the first embodiment are omitted.

  In the first embodiment, the present invention is applied to the joining of the weather strip material 13 in which the substantially tubular hollow seal portions 16 are provided at the base end portions of the side walls 18 and 19 of the mounting portion 15. In the second embodiment, the present invention is applied to the joining of the weather strip material 66 in which the substantially tubular hollow seal portion 16 (strip portion) is provided on the outer side wall 18 of the attachment portion 15, and the end of the weather strip material 66 is applied. At the time of joining together, a negative pressure is generated between the outer surface of the weather strip material 66 and the holding surfaces 38 and 39, and a positive pressure is generated in the hollow portion in the hollow seal portion 16. It should be noted that a negative pressure may be generated on the outer surface of the weather strip material 66 so that no positive pressure is generated in the hollow seal portion 16. Alternatively, a positive pressure may be generated in the hollow seal portion 16 so that a negative pressure is not generated on the outer surface of the weather strip material 66.

  Also in the second embodiment, it is possible to prevent the occurrence of steps or burrs on the outer surface of the joined portion of the hollow seal portion 16, to prevent the sealing performance of the joined portion of the hollow seal portion 16 from being deteriorated, and to improve the appearance. Can do.

  In the first and second embodiments, the present invention is applied to the joining of the weather strip materials 13 and 66 in which the mounting portion 15 is provided with the substantially tubular hollow seal portion 16, but in the third embodiment shown in FIG. By applying the present invention to the joining of a weather strip material 68 provided with a non-hollow seal portion 67 (strip portion) that does not have a hollow portion on the outer side wall 18 of the mounting portion 15, the ends of the weather strip material 68 are joined together. In doing so, a negative pressure is generated between the outer surface 67 a of the non-hollow seal portion 67 and the holding surfaces 38 and 39.

  Also in the third embodiment, it is possible to prevent the occurrence of a step or a burr on the outer surface 67a of the joined portion of the non-hollow seal portion 67, to prevent the sealing performance of the joined portion of the non-hollow seal portion 67 from being deteriorated, and to look good Can be improved.

  In each of the first to third embodiments, when a negative pressure is generated between the outer surface of the weather strip material and the holding surface, it is not always necessary to generate a negative pressure on the entire outer surface of the weather strip material. You may make it generate a negative pressure on the outer surface of the hollow seal part 16 (or non-hollow seal part 67). Moreover, you may make it generate a negative pressure only in the part (vehicle inside seal part 16a) used as a seal surface among the outer surfaces of the hollow seal part 16 (or non-hollow seal part 67).

  Further, in each of the first to third embodiments, the upper mold holding surface 38 (the support portion 16b side of the hollow seal portion 16) and the lower mold holding surface 39 (the vehicle interior seal portion 16a side of the hollow seal portion 16). However, the suction holes 52 may be formed only on the lower mold holding surface 39 that holds the seal surface side (the vehicle interior seal portion 16a portion of the hollow seal portion 16). .

  In addition, the holding surface of the holding mold is formed of a porous material such as sintered metal, and air is sucked through the porous material, so that at least the outer surface and the holding surface of the hollow seal portion 16 (or the non-hollow seal portion 67). A negative pressure may be generated during the period. In this way, at least the outer surface of the hollow seal portion 16 (or the non-hollow seal portion 67) can be adsorbed by the entire holding surface, and the suction fixing of the hollow seal portion 16 (or the non-hollow seal portion 67) can be further performed. It can be performed stably.

  Further, the injection tip of the air blowing pipe 58 is pierced into the vehicle outer side (portion of the support portion 16b) of the hollow seal portion 16 of the weatherstrip material 13, so that the insertion hole 59 is formed. The insertion hole 59 may be formed on the inner side of the vehicle 16 (portion of the vehicle inner side seal portion 16a). In this way, when the back door 22 closes in contact with the hollow seal portion 16 of the weather strip 12 mounted on the opening edge of the back door of the vehicle body panel 11, rainwater or the like enters the insertion hole 59. Can be prevented.

In the first to third embodiments, both holding molds are movable. However, one holding mold may be fixed and the other holding mold may be movable.
In the first to third embodiments, the cutting blade is provided on the holding surface of each holding die. However, the cutting blade may be provided only on the holding surface of any one holding die.

  Moreover, in each said Example 1-3, although the resin which protruded on the outer side of the weatherstrip material was cut | disconnected with a cutting blade, a cut | interruption is formed in the protruding resin with a cutting blade, and an excess part is removed later. You may do it.

The scope of application of the present invention is not limited to the weather strip attached to the opening edge of the back door of the vehicle, but the side door of the vehicle, the door of the cold insulated vehicle, the lid of the refrigerator, the door of the warm warehouse. The present invention may be applied to a weather strip that is attached to an opening edge such as.
Further, the joining direction of the joining portion is not limited to a linear shape, and the joining portions may be joined at a predetermined non-linear angle.

It is a perspective view of the vehicle with which the weather strip in Example 1 of this invention was mounted | worn. It is a partial cross section perspective view of the weather strip of Example 1. FIG. It is a front view of a manufacturing apparatus. It is a figure which shows the state at the time of closing of a holding | maintenance type by AA sectional drawing of FIG. It is a figure which shows the state at the time of open | release of a holding | maintenance type | mold by AA sectional drawing of FIG. It is a longitudinal cross-sectional front view of the lower mold | type of a holding | maintenance type | mold, and its peripheral part. It is a longitudinal cross-sectional front view of a manufacturing apparatus. It is a partial cross section side view of the weather strip of Example 2. It is a partial cross section perspective view of the weather strip of Example 3.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Weather strip, 13 ... Weather strip material, 15 ... Mounting part, 16 ... Hollow seal part (strip part), 26 ... Manufacturing apparatus, 27 ... Holding type, 31 ... Upper type (movable type), 32 ... Lower type (Fixed mold), 33 ... middle mold, 36 ... positioning recess, 37 ... positioning stopper, 38 ... upper mold holding surface, 39 ... lower mold holding surface, 43 ... heater, 44 ... cutting blade, 46 ... end face positioning member, 49 ... Holding type positioning surface, 50 ... end face positioning surface, 51 ... positioning convex part, 52 ... suction hole, 53, 54 ... negative pressure supply path, 55 ... collective negative pressure supply path, 56 ... negative pressure pump, 57 ... open / close valve, 58 ... Air blowing pipe, 60 ... Positive pressure supply path, 61 ... Collective positive pressure supply path, 62 ... Positive pressure pump, 63, 64 ... Open / close valve, 66 ... Weather strip material, 67 ... Non-hollow seal part (strip part) ), 68 ... Weather strip material

Claims (11)

A method of manufacturing a weather strip in which end portions of one or more long thermoplastic synthetic resins each having an elastically deformable strip portion are heated and melted to join the end faces of the strip portion. There,
A pair of holding molds for holding the end of the weather strip material are arranged to face each other so as to be able to approach and separate, and an end surface positioning member for positioning an end surface of the weather strip material is the pair of holding molds Are arranged so as to be movable between a position protruding between the opposed surfaces and a position retracted from between the opposed surfaces, and a holding surface for holding the strip portion is formed on each of the pair of holding dies. A movable die and a fixed die are provided so as to be openable and closable, and at least one of the opposed surfaces of the pair of holding dies is provided with a cutting blade protruding toward the other along the end of the holding surface. Using the device,
The end face positioning member protrudes between the opposing surfaces of the pair of holding dies, and the end face of the strip portion is brought into contact with the end face positioning member with the both holding dies open. A step of setting the weatherstrip material to the fixed mold so that the predetermined set position slightly protrudes from the cutting edge of the cutting blade;
While the pair of holding dies are closed, a negative pressure lower than the atmospheric pressure is generated between the outer surface of the strip portion and the holding surface, thereby adsorbing the outer surface of the strip portion to the holding surface. A negative pressure application step of fixing the strip portion to the holding mold so as not to move;
A heating step of heating the opposing ends of the weatherstrip material held in the pair of holding molds into a state capable of being fused, and
Retracting the end surface positioning member from between the opposing surfaces of the pair of holding molds;
The ends of the strip portions are caused by causing the pair of holding molds to approach each other and pressing the ends of the strip portions together while a negative pressure is generated between the outer surface of the strip portions and the holding surface. The end surfaces of the strip portions are fused together by applying a compressive force in the longitudinal direction, and the cutting blade cuts the resin protruding outside the strip portions along the outer surface of the strip portions, or A bonding step for forming a cut in the resin;
A method for producing a weather strip, comprising: a step of opening the holding mold after releasing the negative pressure and taking out the weather strip material to which the strip portion is bonded from the holding mold. The strip portion is formed in a substantially tube shape,
In the joining step, in the state where negative pressure is generated between the outer surface of the strip portion and the holding surface, the pair of holding molds are brought close to each other and the ends of the strip portion are pressed against each other. The outer surface of the strip portion is crimped to the holding surface by generating a positive pressure higher than atmospheric pressure in the hollow portion in the piece portion, and the strip portion is fixed to the holding mold so as not to move, Resin that protrudes outside the strip portion along the outer surface of the strip portion by the cutting blade by fusing the end surfaces of the strip portion by applying a compressive force in the longitudinal direction to the end of the strip portion Or form a cut in the resin,
The said removal process WHEREIN: After releasing the said negative pressure and the said positive pressure, the said holding mold is opened, The weatherstrip raw material with which the said strip part was joined is taken out from this holding mold. Weatherstrip manufacturing method. A weather strip that is elastically deformable and has one or a plurality of elongated thermoplastic synthetic resin weather strip materials having a substantially tubular strip portion heated and melted together to join the end surfaces of the strip portions. A method of manufacturing comprising:
A pair of holding molds for holding the end of the weather strip material are arranged to face each other so as to be able to approach and separate, and an end surface positioning member for positioning an end surface of the weather strip material is the pair of holding molds Are arranged so as to be movable between a position protruding between the opposed surfaces and a position retracted from between the opposed surfaces, and a holding surface for holding the strip portion is formed on each of the pair of holding dies. A movable die and a fixed die are provided so as to be openable and closable, and at least one of the opposed surfaces of the pair of holding dies is provided with a cutting blade protruding toward the other along the end of the holding surface. Using the device,
The end face positioning member protrudes between the opposing surfaces of the pair of holding dies, and the end face of the strip portion is brought into contact with the end face positioning member with the both holding dies open. A step of setting the weatherstrip material to the fixed mold so that the predetermined set position slightly protrudes from the cutting edge of the cutting blade;
Closing the pair of holding molds and disposing the strip portion between the holding surfaces;
A heating step of heating the opposing ends of the weatherstrip material held in the pair of holding molds into a state capable of being fused, and
Retracting the end surface positioning member from between the opposing surfaces of the pair of holding molds;
The outer surface of the strip portion is generated by generating a positive pressure higher than the atmospheric pressure in the hollow portion in the strip portion in a state where the pair of holding molds are brought close to each other and the ends of the strip portion are pressed against each other. A positive pressure application step of crimping the holding surface and fixing the strip portion to the holding mold so as not to move;
The ends of the strip portions are pressed by pressing the ends of the strip portions with each other and applying a compressive force in the longitudinal direction to the ends of the strip portions in a state where positive pressure is generated in the hollow portions in the strip portions. A step of fusing together and cutting the resin protruding outside the strip portion along the outer surface of the strip portion with the cutting blade or forming a cut in the resin; and
A method of manufacturing a weather strip, comprising: a step of opening the holding mold after releasing the positive pressure and taking out the weather strip material to which the strip portion is bonded from the holding mold.   Adsorption holes are formed at a plurality of locations on the holding surface of the holding mold, and negative pressure is generated between the outer surface of the strip portion and the holding surface by sucking air through the adsorption holes. The method of manufacturing a weather strip according to claim 1 or 2.   The holding surface of the holding mold is formed of a porous material, and negative pressure is generated between the outer surface of the strip portion and the holding surface by sucking air through the porous material. Item 3. A method for producing a weather strip according to Item 1 or 2.   In the setting step, both the holding dies are brought close to each other so that the end surface positioning member is sandwiched between the opposing surfaces of the pair of holding dies, and the end surface of the weather strip material is in a position retracted from the cutting edge of the cutting blade. With the weather strip material arranged in the fixed mold as described above, the weather strip material is slid in the direction of the end surface positioning member to bring the end surface of the weather strip material into contact with the end surface positioning member. 6. The method of manufacturing a weather strip according to claim 1, wherein a weather strip material is set at the predetermined setting position.   In the setting step, the end surface positioning member protrudes between the opposing surfaces of the pair of holding dies to separate the both holding dies, and the end surface of the weatherstrip material protrudes from the cutting edge of the cutting blade. With the weather strip material arranged in the fixed mold as described above, the pair of holding molds are moved closer to bring the end surface of the weather strip material into contact with the end surface positioning member, and the end surface of the weather strip material is 2. The weatherstrip material is moved backward relative to the holding mold by moving the holding mold in contact with the end face positioning member, and set at the predetermined position. A method for producing a weather strip according to any one of 1 to 5.   Cutting blades are formed on both opposing surfaces of the pair of holding dies, and the resin protruding outside the strip portion along the outer surface of the strip portion is cut with the cutting blades from both sides in the thickness direction. The method for producing a weather strip according to any one of claims 1 to 7. The weather strip material is made of a thermoplastic elastomer resin, and is attached to an attachment portion, the strip portion protruding from the attachment portion to form a seal portion, and the attachment portion and the attachment portion. A seal lip that seals the gap between them,
The method for manufacturing a weather strip according to any one of claims 1 to 8, wherein, in the joining step, all end surfaces of the attachment portion, the strip portion, and the seal lip are joined.   The method for producing a weather strip according to claim 9, wherein the strip portion and the seal lip are formed of a foamed thermoplastic elastomer resin.   In the heating step, the end surface of the weather strip material is melted by bringing a hot plate heated to a temperature higher than a melting temperature of the synthetic resin forming the weather strip material into contact with the end surface of the weather strip material. The method for producing a weather strip according to any one of claims 1 to 10.

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