An injection-molding press for overmolding a second part onto a first part (8) includes a movable portion and a fixed portion, with a first mold element (11, 12) on one of the press portions and a second mold element (20) on the other press portion so as to form a cavity (C) between the mold portion
An injection-molding press for overmolding a second part onto a first part (8) includes a movable portion and a fixed portion, with a first mold element (11, 12) on one of the press portions and a second mold element (20) on the other press portion so as to form a cavity (C) between the mold portions when the press is closed. The first mold portion (11, 12) has a first support surface (125a) movable in the first mold portion and the second mold portion (20) has a second support surface (22a). In the closed position of the press with a first part (8) in the first mold portion and the first support surface (125a) advanced in the working position, at least a portion (8b) of the front end of the first part (8) is clamped between the two support surfaces (125a, 22a), forming a tight seal for the cavity (C).
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1. Injection-molding press for overmolding by injection-molding a second part on a first part, comprising: a movable portion and a fixed portion,at least a first mold element arranged on one of the portions of the press and at least a second mold element arranged on the other portion of the press so
1. Injection-molding press for overmolding by injection-molding a second part on a first part, comprising: a movable portion and a fixed portion,at least a first mold element arranged on one of the portions of the press and at least a second mold element arranged on the other portion of the press so as to form a cavity between the first and second mold elements when the press is closed, wherein a closing movement comprises a movement of the movable portion toward the fixed portion in a closing direction,the first mold element being provided with a first support surface and the second mold element being provided with a second support surface, the first and second support surfaces being disposed in their respective mold element so that, in the closed position of the press with a first part inserted in the first mold element, at least a portion of a front end of the first part is clamped between the first and second support surfaces so as to form a tight seal for the cavity,wherein the first support surface is movable in the first mold element and the first support surface is movable in a direction parallel to the closing direction between a retracted position and an advanced position, called working position, so that in the closed position of the press with a first part inserted into the first mold element and with the first support surface in the advanced position, at least a portion of the front end of the first part is clamped between the first and second support surfaces so as to form a tight seal for the molding cavity during the entire duration of injection. 2. Press according to claim 1, wherein the first mold element comprises a core and the second mold element is constituted by a matrix. 3. Press according to claim 2, wherein the core is arranged on the movable portion of the press and the matrix is arranged on the fixed portion of the press. 4. Injection-molding press for overmolding by injection-molding a second part on a first part, comprising: a movable portion and a fixed portion,at least a first mold element arranged on one of the portions of the press and at least a second mold element arranged on the other portion of the press so as to form a cavity between the first and second mold elements when the press is closed,the first mold element being provided with a first support surface and the second mold element being provided with a second support surface, the first and second support surfaces being disposed in their respective mold elements so that, in the closed position of the press with a first part inserted in the first mold element, at least a portion of a front end of the first part is clamped between the first and second support surfaces so as to form a tight seal for the cavity,wherein the first support surface is movable in the first mold element and the first support surface is movable between a retracted position and an advanced position, called working position, so that in the closed position of the press with a first part inserted into the first mold element and with the first support surface in the advanced position, at least a portion of the front end of the first part is clamped between the first and second support surfaces so as to form a tight seal for the cavity during the entire duration of injection,wherein the first mold element comprises a core and the second mold element is constituted by a matrix,wherein the core comprises a hollow cylindrical part and a valve disposed partially inside the cylindrical part, the valve being movable relative to the cylindrical part between a retracted position and an advanced position in which, when the press is closed, the first support surface is pressed against the second support surface with the interposition of at least a portion of the front end of the first part. 5. Press according to claim 4, wherein the first support surface includes a portion of the top face of the valve, and the second support surface includes a portion of the bottom wall of the matrix. 6. Press according to claim 5, wherein the first support surface and the second support surface have an annular shape surrounding the cavity. 7. Press according to claim 4, wherein the valve comprises a rod terminated at its front side by a head having a larger cross section, said head being provided with a cylindrical wall having the same external contour as the cylindrical portion of the core and being closed in the direction of the matrix by a top wall, the peripheral portion of which constitutes the first support surface and the center of which constitutes a portion of the molding surface for the second part and delimits a portion of the cavity. 8. First mold element for a press, comprising a first support surface movable in the first mold element for clamping, between the first support surface and a corresponding support surface of a second mold element, at least a portion of the front end of a first part inserted in the first mold element so as to form a tight seal for the cavity during the entire duration of injection; wherein a part of the first mold element is movable toward the second mold element to take a first position when the press is closed;and wherein, in the first position of the part of the first mold element, the first support surface is movable relative to the part of the first mold element between a retracted position and an advanced position, called working position, and is configured to cooperate with a corresponding support surface of the second mold element so that, with the first support surface in the advanced position, the portion of the front end of the first part inserted into the first mold element is clamped between the first and second support surfaces. 9. First mold element according to claim 8, comprising a core constituted by a hollow cylindrical part and a valve disposed partially inside the cylindrical part, the valve being movable relative to the cylindrical part between a retracted position and an advanced position in which, when the press is closed in the direction of the matrix, the first support surface is pressed against the second support surface with the interposition of at least a portion of the front end of the first part. 10. First mold element according to claim 9, wherein the first support surface is constituted by a portion of the top face of the valve. 11. First mold element according to claim 10, wherein the first support surface has an annular shape. 12. First mold element according to claim 9, wherein the valve comprises a rod terminated at its front by a head having a larger cross section, said head being provided with a cylindrical wall having the same external contour as the cylindrical part of the core and being closed in the direction of the matrix by a top wall, the peripheral portion of which constitutes the first support surface and the center of which constitutes a portion of the molding surface for the second part and delimits a portion of the cavity. 13. Method for overmolding a second part on a first part in a press, wherein the press is the injection-molding press according to claim 1,wherein the method comprises the following steps:a. opening the press;b. positioning a first part on or in the first mold element;c. closing the press;d. injection-molding the second part onto the first part in the cavity formed between the first and second elements;e. opening the press;f. ejecting the finished object and returning to step (b),wherein, in step (c) or during a step (c1) following step (c) and prior to step (d)), at least a portion of the front end of the first part is clamped between the first support surface and the second support surface so as to form a tight seal for the cavity, and in step (e) or during a step (d1) following step (d) and prior to step (e), the clamping of the front end portion of the first part is removed. 14. The method as claimed in claim 13, wherein at least one of the clamping of step (c) or (c1) and the removal of this clamping in step (e) or (d1) is obtained by moving the first support surface relative to the second support surface. 15. The method of claim 13, wherein the first mold element comprises a core and the second mold element is constituted by a matrix,wherein the core comprises a hollow cylindrical part and a valve disposed partially inside the cylindrical part, the valve being movable relative to the cylindrical part between a retracted position and an advanced position in which, when the press is closed, the first support surface is pressed against the second support surface with the interposition of at least a portion of the front end of the first part,wherein at least one of the clamping of step (c) or (c1) and the removal of this clamping in step (e) or (d1) is obtained by moving the valve relative to the cylindrical part. 16. The method of claim 14, wherein the first mold element comprises a core and the second mold element is constituted by a matrix,wherein the core comprises a hollow cylindrical part and a valve disposed partially inside the cylindrical part, the valve being movable relative to the cylindrical part between a retracted position and an advanced position in which, when the press is closed, the first support surface is pressed against the second support surface with the interposition of at least a portion of the front end of the first part,wherein at least one of the clamping of step (c) or (c1) and the removal of this clamping in step (e) or (d1) is obtained by moving the valve relative to the cylindrical part. 17. Press according to claim 3, wherein the core comprises a hollow cylindrical part and a valve disposed partially inside the cylindrical part, the valve being movable relative to the cylindrical part between a retracted position and an advanced position in which, when the press is closed, the first support surface is pressed against the second support surface with the interposition of at least a portion of the front end of the first part. 18. Press according to claim 17, wherein the first support surface includes a portion of the top face of the valve, and the second support surface includes a portion of the bottom wall of the matrix. 19. Press according to claim 18, wherein the first support surface and the second support surface have an annular shape surrounding the cavity. 20. Press according to claim 17, wherein the valve comprises a rod terminated at its front side by a head having a larger cross section, said head being provided with a cylindrical wall having the same external contour as the cylindrical portion of the core and being closed in the direction of the matrix by a top wall, the peripheral portion of which constitutes the first support surface and the center of which constitutes a portion of the molding surface for the second part and delimits a portion of the cavity. 21. Method for overmolding a second part on a first part in a press, wherein the press is an injection-molding press for overmolding by injection-molding a second part on a first part, comprising:a movable portion and a fixed portion,at least a first mold element arranged on one of the portions of the press and at least a second mold element arranged on the other portion of the press so as to form a cavity between the first and second mold elements when the press is closed,the first mold element being provided with a first support surface and the second mold element being provided with a second support surface, the two support surfaces being disposed in their respective mold elements so that, in the closed position of the press with a first part inserted in the first mold element, at least a portion of a front end of the first part is clamped between the first and second support surfaces so as to form a tight seal for the cavity,wherein the first support surface is movable in the first mold element and the first support surface is movable between a retracted position and an advanced position, called working position, so that in the closed position of the press with a first part inserted into the first mold element and with the first support surface in the advanced position, at least a portion of the front end of the first part is clamped between the first and second support surfaces so as to form a tight seal for the cavity during the entire duration of injection,wherein the first mold element comprises a core and the second mold element is constituted by a matrix,wherein the core comprises a hollow cylindrical part and a valve disposed partially inside the cylindrical part, the valve being movable relative to the cylindrical part between a retracted position and an advanced position in which, when the press is closed, the first support surface is pressed against the second support surface with the interposition of at least a portion of the front end of the first part,wherein the method comprises the following steps:a. opening the press;b. positioning a first part on or in the first mold element;c. closing the press;d. injection-molding the second part onto the first part in the cavity formed between the first and second mold elements;e. opening the press;f. ejecting the finished object and returning to step (b),wherein, in step (c) or during a step (c1) following step (c) and prior to step (d)), at least a portion of the front end of the first part is clamped between the first support surface and the second support surface so as to form a tight seal for the cavity, and in step (e) or during a step (d1) following step (d) and prior to step (e), the clamping of the front end portion of the first part is removed,wherein at least one of the clamping of step (c) or (c1) and the removal of this clamping in step (e) or (d1) is obtained by moving the valve relative to the cylindrical part.
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이 특허에 인용된 특허 (4)
Hatakeyama Yoshiharu (Tokyo JPX) Ishikawa Tatsuo (Chiba JPX) Teshima Kenzo (Chiba JPX), Method and apparatus for molding a tubular container with a cap.
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