Weather strip and production method thereof

Abstract

A weather strip includes an extrusion molded extrusion molded portion, an injection molded portion which connects both ends of the extrusion molded portions in a straight line shape, a trim portion which is mounted on a circumferential edge of an opening of a luggage compartment, and a hollow sealing portion which protrudes from the trim portion. The injection molded portion is formed such that a width thereof is 2.0. The hollow sealing portion is provided with a core withdrawing hole, through which a core mold forming an inner peripheral surface of the hollow sealing portion is withdrawn after formation. The core withdrawing hole is formed such that a length thereof along a circumferential direction of the inner peripheral surface of the hollow sealing portion is 40% of a circumferential length of the inner peripheral surface.

1 . A weather strip comprising:
 an extrusion molded extrusion molded portion;   an injection molded portion which connects both ends of the extrusion molded portions in a straight line shape;   a mounting base portion which is mounted on a circumferential edge of an opening of a body or a circumferential edge of an opening/closing member for opening and closing the opening; and   a hollow sealing portion which protrudes from the mounting base portion, and is pressed against an opposite member when the opening/closing member for opening and closing the opening is closed,   wherein the injection molded portion is formed such that a width thereof in a longitudinal direction of the weather strip is 0.5 mm or more and 3.0 mm or less,   the hollow sealing portion is provided with a core withdrawing hole, through which a core mold member forming an inner peripheral surface of the hollow sealing portion is withdrawn after formation, and   the core withdrawing hole is formed such that a length thereof along a circumferential direction of the inner peripheral surface of the hollow sealing portion is 25% or more and 45% or less of a circumferential length of the inner peripheral surface in a region of the hollow sealing portion except for a sealing surface which is pressed against the opposite member.   
     
     
         2 . The weather strip according to  claim 1 , wherein the mounting base portion is a trim portion of a substantially U-shaped cross section which is mounted along the circumferential edge of the opening of the body, and has an outer-peripheral-side sidewall portion, an inner-peripheral-side sidewall portion, and a connecting portion for connecting both sidewall portions, and
 the hollow sealing portion protrudes from the connecting portion, and has a sealing wall which is pressed against the peripheral portion of the opening/closing member when the opening/closing member for opening and closing the opening is closed, the core withdrawing hole, and a front end lip provided in the vicinity of the core withdrawing hole.   
     
     
         3 . The weather strip according to  claim 1 , wherein the injection molded portion is made of relatively soft olefin-based thermoplastic elastomer of 40 IRHD (International Rubber Hardness Degrees) in the overall portion. 
     
     
         4 . The weather strip according to  claim 1 , wherein the weather strip includes a trim portion which is mounted on a circumferential edge of a door opening of the body, and a hollow sealing portion which protrudes from a vehicle outer sidewall portion of the trim portion, and is pressed against the circumferential edge of a door when the door for opening and closing the door opening is closed, and
 the core withdrawing hole of the hollow sealing portion is formed such that the length thereof along the circumferential direction of the inner peripheral surface of the hollow sealing portion is 25% or more and 45% or less of the circumferential length of the inner peripheral surface in the region of the hollow sealing portion except for the sealing surface which is pressed against the circumferential edge of the door.   
     
     
         5 . The weather strip according to  claim 4 , wherein the injection molded portion is provided such that it is positioned at a lower edge portion of the door opening. 
     
     
         6 . The weather strip according to  claim 4 , wherein the injection molded portion is made of relatively soft olefin-based thermoplastic elastomer of 40 IRHD in the overall portion including the trim portion and the hollow sealing portion. 
     
     
         7 . The weather strip according to  claim 1 , wherein the weather strip includes a mounting base portion which is mounted on a circumferential edge of a movable loop for opening and closing a loop panel opening of a body, and a hollow sealing portion which protrudes from the mounting base portion, and has a sealing wall which is pressed against the circumferential edge of the loop panel opening when the movable loop is closed, and
 the core withdrawing hole of the hollow sealing portion is formed such that a length thereof along a circumferential direction of the inner peripheral surface of the hollow sealing portion is 15% or more and 45% or less of a circumferential length of the inner peripheral surface in a region of the hollow sealing portion except for a sealing surface which is pressed against the circumferential edge of the loop panel opening.   
     
     
         8 . The weather strip according to  claim 7 , wherein the mounting base portion is mounted along the circumferential edge of the movable loop, is formed in a substantially U-shaped cross section, and has an outer-peripheral-side sidewall portion, an inner-peripheral-side sidewall portion, and a connecting portion for connecting both sidewall portions, and the mounting base portion has an extension base portion which extends at an angle from an end of the outer-peripheral-side sidewall portions to form a portion of the hollow sealing portion with the sealing wall, or a dewatering lip which extends at an angle outwardly from the sealing wall or extending immediately under the sealing wall, and
 the core withdrawing hole is provided at a position of either of the sealing wall or the extension base portion which is adjacent to the dewatering lip.   
     
     
         9 . A method for producing a weather strip including
 an extrusion molded extrusion molded portion;   an injection molded portion which is formed by a molding device having a plurality of mold members and connects both ends of the extrusion molded portions in a straight line shape;   a mounting base portion which is mounted on a circumferential edge of an opening of a body or a circumferential edge of an opening/closing member for opening and closing the opening; and   a hollow sealing portion which protrudes from the mounting base portion, and is pressed against an opposite member when the opening/closing member for opening and closing the opening is closed,   wherein in a core mold member having a core body for forming an inner peripheral surface of a hollow sealing portion of the injection molded portion, and a holding portion protruding from the core body, in a state in which both ends of the core body are inserted into a terminal of the hollow sealing portion of the extrusion molded portion when the injection molded portion is formed, the core mold member is positioned at a predetermined position of the molding device such that a connecting width of the injection molded portion in a longitudinal direction of the weather strip is 0.5 mm or more and 3.0 mm or less, the mold member is closed to form a cavity in the molding device, and the cavity is filled with a material of the injection molded portion to form the injection molded portion;   the injection molded portion is provided with a core withdrawing hole, through which the core body is withdrawn by at least the holding portion after the core body is formed, such that a length thereof along a circumferential direction of the inner peripheral surface of the hollow sealing portion is 25% or more and 45% or less of a circumferential length of the inner peripheral surface in a region of the hollow sealing portion except for a sealing surface which is pressed against the opposite member; and   after the injection molded portion is formed and the mold member of the molding device is opened, the core body is withdrawn from the core withdrawing hole.   
     
     
         10 . The method for producing the weather strip according to  claim 9 , wherein among the plurality of mold members, a predetermined mold member opposite to the outer peripheral surface of the core body is provided with a locking protrusion for locking the extrusion molded portion which is inserted into the core body. 
     
     
         11 . The method for producing the weather strip according to  claim 9 , wherein olefin-based thermoplastic elastomer of 40 IRHD is used as a material of the injection molded portion. 
     
     
         12 . The method for producing the weather strip according to  claim 9 , wherein the injection molded portion is disposed such that a predetermined mold member among the plurality of mold members abuts one side of the holding portion in the circumferential direction of the hollow sealing portion and also abuts the core body, and after the cavity is filled with the material, the predetermined mold member is relatively spaced apart from the core mold member to form a portion of the core withdrawing hole. 
     
     
         13 . The method for producing the weather strip according to  claim 9 , wherein the weather strip includes a trim portion which is mounted on a circumferential edge of a door opening of the body, and a hollow sealing portion which protrudes from a vehicle outer sidewall portion of the trim portion, and is pressed against the circumferential edge of the door when the door for opening and closing the door opening is closed, and
 at the time of forming the injection molded portion, the core withdrawing hole, through which the core body is withdrawn by at least the holding portion after the forming, is formed such that the length thereof along the circumferential direction of the inner peripheral surface of the hollow sealing portion is 25% or more and 45% or less of the circumferential length of the inner peripheral surface in the region of the hollow sealing portion except for the sealing surface which is pressed against the circumferential edge of the door.   
     
     
         14 . The method for producing the weather strip according to  claim 9 , wherein the weather strip includes a mounting base portion which is mounted on a circumferential edge of a movable loop for opening and closing a loop panel opening of the body, and a hollow sealing portion which protrudes from the mounting base portion, and has a sealing wall which is pressed against the circumferential edge of the loop panel opening when the movable loop is closed, and
 at the time of forming the injection molded portion, the core withdrawing hole, through which the core body is withdrawn by at least the holding portion after the forming, is formed such that the length thereof along the circumferential direction of the inner peripheral surface of the hollow sealing portion is 15% or more and 45% or less of the circumferential length of the inner peripheral surface in the region of the hollow sealing portion except for the sealing surface which is pressed against the circumferential edge of the loop panel opening.