METHOD AND INJECTION MOULD FOR PRODUCING A PRODUCT FROM AN INSERT AND PLASTIC BODY INJECTION-MOULDED THEREON

Abstract

A method for producing a product comprising a cup-shaped insert with a circumferential edge and a circumferential plastic body which is injection-molded onto the edge. The method includes: inserting the insert into a first mold of an injection molding tool; injecting a plastic melt into a first circumferential cavity formed by the first mold and the insert to produce a first circumferential plastic body part having a web which forms a recess; inserting the insert into a second mold of an injection molding tool, with the second mold designed such that a second circumferential cavity is formed on the edge region to be injection-molded to produce a second circumferential plastic body part; injecting a plastic melt into the second mold so that the plastic melt flows through the recess, fills the second cavity, and forms the second plastic body part; and removing the product from the mold.

Claims

1-10. (canceled)

11. A method for producing a product comprising a cup-shaped insert having a peripheral edge which is to be reinforced and a peripheral plastic body which is injection-moulded onto the edge, the plastic body surrounding an edge region of the cup-shaped insert on both sides and at an end face, the method comprising: providing a first mould part of an injection mould; inserting the cup-shaped insert into the first mould part, the first mould part and the insert being designed in such a manner that a first peripheral cavity is formed on the inner side and at the end face at the edge region which is to be overmoulded and the outer side of the edge region of the insert bears against a wall of the first cavity; injecting a first polymer melt into the first peripheral cavity to manufacture a first peripheral plastic body part, the first peripheral cavity having a rib which forms a recess in the first peripheral plastic body part at the end face of the edge region of the insert; providing a second mould part of an injection mould; inserting the cup-shaped insert having the first peripheral plastic body part into the second mould part, the second mould part being designed in such a manner that a second peripheral cavity for manufacturing a second peripheral plastic body part is formed on the outer side on the edge region to be overmoulded and that the recess in the first peripheral plastic body part is connected to the second peripheral cavity; injecting a second polymer melt into the second mould part so that the second polymer melt flows through the recess of the first plastic body part, fills the second cavity and thus forms the second plastic body part; removing the product having a peripheral plastic body consisting of the first and the second plastic body parts from the mould.

12. The method according to claim 11, wherein the first and second cavities in each case have at least one injection point for the first or second polymer melt.

13. The method according to claim 11, wherein the rib is arranged in a region in which two flow fronts of the first polymer melt meet.

14. The method according to claim 11, wherein the first cavity has a plurality of injection points and a plurality of ribs, wherein the plurality of injection points are arranged uniformly along the first cavity and the plurality of ribs are in each case arranged centrally between two injection points.

15. The method according to claim 12, wherein the insert having the first plastic body part is inserted into the second mould part in such a manner that the recess is located at the injection point for the second polymer melt.

16. The method according to claim 12, wherein the injection point for the first polymer melt and the injection point for the second polymer melt are located on the same side of the respective mould part.

17. The method according to claim 11, wherein the product is a container, wherein the insert forms a container body or a container wall and the plastic body forms a peripheral collar having an outwardly directed edge similar to a flange, an external thread or latching means for a container lid.

18. An injection mould for the method according to claim 11, the injection mould comprising at least one first mould part and at least one second mould part, the first mould part forming a first peripheral cavity into which the insert having the edge region to be overmoulded can be inserted, so that the outer side of the edge region bears against a wall of the first cavity; the first peripheral cavity having a rib for creating a recess in the first peripheral plastic body part; and the second mould part being designed in such a manner that the cup-shaped insert having the first peripheral plastic body part can be inserted into the second mould part and that a second peripheral cavity for manufacturing the second peripheral plastic body part is formed on the outer side on the edge region to be overmoulded, the recess in the first peripheral plastic body part being connected to the second peripheral cavity.

19. The injection mould according to claim 18, wherein the first cavity has a plurality of injection points and a plurality of ribs, wherein the plurality of injection points are arranged uniformly along the first cavity and the plurality of ribs are in each case arranged centrally between two injection points.

20. The injection mould according to claim 18, wherein an injection point for the first polymer melt and an injection point for the second polymer melt are located on the same side of the respective mould part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The invention shall be explained in more detail in the following with reference to exemplary embodiments in connection with the drawing(s). In the figures:

[0027] FIGS. 1A and 1B show a sectional illustration of a first mould part at (a) in the region of an injection point (FIG. 1A) and at (b) in the region of a rib (FIG. 1B);

[0028] FIGS. 2A and 2B show a sectional illustration of a second mould part at (a) in the region of the injection moulding of the first injection-moulded body part (FIG. 2A) and at (b) in the region of an injection point (FIG. 2B);

[0029] FIG. 3 shows a sectional illustration through a section of a product made from an insert and a plastic body moulded thereon;

[0030] FIG. 4 shows a sectional illustration through the first mould part in the region of the first cavity.

EMBODIMENTS OF THE INVENTION

[0031] FIG. 4 shows a sectional illustration through a section of a product made from a cup-shaped insert 3 having a peripheral edge which is to be reinforced and a peripheral plastic body 4 which is injection-moulded onto the edge. In this case, the plastic body 4 encloses an edge region 31 of the cup-shaped insert 3 on both sides and at the end face. The cup-shaped insert 3 typically has a base and a peripheral side wall. At the upper edge of the side wall, an outwardly directed edge (flange) similar to a flange is formed. The plastic body 4 isas presented belowinjected in a two-component method by means of two mould parts and is correspondingly manufactured from a first peripheral plastic body part 41 and a second peripheral plastic body part 42.

[0032] FIGS. 1A and B show a sectional illustration of a detail of a first mould part 1 at (a) in the region of an injection point 12 for the first polymer melt (FIG. 1A) and at (b) in the region of a rib 13 (FIG. 1B). The first mould part 1 forms a first peripheral cavity 11, into which the edge region 31 of the insert 3, which is to be overmoulded, can be inserted. In this case, the outer side A of the insert 3 rests on a wall of the first cavity 11. The inner side I of the insert 3 is orientated towards the first cavity 11.

[0033] The cavity 1 has at least one injection point 12 for the first polymer melt for manufacturing the first peripheral plastic body part 41. This first peripheral plastic body part 41 forms a part of the plastic body and is arranged on the inner side I of the insert. When the first polymer melt is injected, this polymer melt distributes itself in the first peripheral cavity 11. In a region of the first peripheral cavity 11 in which the flow fronts of the first polymer melt meet, a rib 13 is formed inside the first cavity 11 (cf. FIG. 1B). This rib 13 is arranged in such a manner that an end face S of the edge region 31 of the insert adjoins the rib 13. The rib 13 forms a recess 43 in the first plastic body part 41, the function of which is explained below under FIG. 2B.

[0034] FIGS. 2A and 2B show a sectional illustration of a detail of a second mould part 2 at (a) in the region of the injection moulding of the first injection-moulded body part 41 (FIG. 2A) and at (b) in the region of an injection point of a second peripheral cavity 21 (FIG. 2B). The second mould part 2 forms the second peripheral cavity 21 for manufacturing the second peripheral plastic body part 42. The second cavity 21 is designed in such a manner that the insert 3 having the first plastic body part 41 injection-moulded thereon can be accommodated therein and the free second cavity 21 is formed on the outer side. The insert having the first plastic body part 41 is orientated in such a manner in this case that an injection point 22 of the second mould part 2 comes to lie in the recess 43 of the first plastic body part 41. The second polymer melt is injected through the recess 43 in this case and thus fills the second cavity 21 at the outer side A of the insert 3.

[0035] FIG. 4 shows a sectional illustration through the first mould part 1 in the region of the first cavity 11. In the embodiment shown, the first mould part 1 is provided with two injection points 12, 12 which are arranged at diametrically opposite points. Furthermore, the first cavity 11 has two ribs 13, 13 which are in each case arranged between the two injection points 12, 12 and in each case form a recess 43 in the first plastic body part 41. The dashed line indicates the end face of the insert 3.

LIST OF REFERENCE NUMBERS

[0036] 1 First mould part [0037] 11 First peripheral cavity [0038] 12, 12 Injection point for the first polymer melt [0039] 13, 13 Rib [0040] 2 Second mould part [0041] 21 Second peripheral cavity [0042] 22 Injection point for the second polymer melt [0043] 3 Cup-shaped insert [0044] 31 Edge, edge region [0045] 4 Plastic body [0046] 41 First peripheral plastic body part [0047] 42 Second peripheral plastic body part [0048] 43 Recess [0049] A Outer side of the edge region [0050] I Inner side of the edge region [0051] S End face of the edge region