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US 10,800,090 B2Granted
Method of and apparatus for manufacturing a plastic container having a curled rim
AssigneeDexter Mould Technology B.V.
InventorErik Van Tilborgh
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a plastic container having a curled rim (320) comprises the steps of providing a sheet of plastic material; drawing a portion thereof into a mould (120) to form a bottom and wall (310′) of the container, leaving a surrounding portion of material to form a rim (320) of the container; cutting the rim loose from a remaining portion of material; and curling the rim. In the curling step, an inner part of the rim is supported by a supporting member while an outer part is pressed by a pressing member (230) moving relative to the supporting member for the rim to be bent around the supporting member.
Claims17
A moulding apparatus comprising:
- a lower mould portion having a moulding cavity and comprising:
- a bottom part having a cavity-facing surface;
- an inner annular part including:
- a circumferential cavity-facing surface;
- and
- a top surface having an outer radius;
- and
- an outer annular part arranged around the inner annular part of the lower mould portion, the outer annular part of the lower mould portion including an outer edge and a top surface having an inner radius and an outer radius;
- wherein the moulding cavity is defined by the cavity-facing surface of the bottom part of the lower mould portion and the circumferential cavity-facing surface of the inner annular part of the lower mould portion;
- and
- wherein the inner radius of the top surface of the outer annular part of the lower mould portion is cooperatively shaped to correspond with the outer radius of the top surface of the inner annular part of the lower mould portion;
- and
- an upper mould portion having a mandrel cavity and comprising:
- a central mandrel;
- an inner annular part including:
- a circumferential cavity-facing surface;
- and
- a bottom surface having an outer radius that is larger than the outer radius of the top surface of the inner annular part of the lower mould portion;
- an intermediate annular part arranged around the inner annular part of the upper mould portion, the intermediate annular part of the upper mould portion including a bottom surface having an inner radius and an outer radius and being configured to bend down a planar rim portion of a sheet of plastic material and then curl the bent rim portion;
- and
- an outer annular part of the upper mould portion arranged around the intermediate annular part of the upper mould portion, the outer annular part of the upper mould portion including a bottom surface having an inner radius and an outer radius;
- wherein the mandrel cavity is defined by the circumferential cavity-facing surface of the inner annular part of the upper mould portion;
- wherein the central mandrel is arranged in the mandrel cavity;
- wherein the inner radius of the bottom surface of the intermediate annular part of the upper mould portion is cooperatively shaped to correspond with the outer radius of the bottom surface of the inner annular part of the upper mould portion;
- wherein the outer radius of the bottom surface of the intermediate annular part of the upper mould portion is cooperatively shaped to correspond with the outer radius of the top surface of the outer annular part of the lower mould portion;
- and
- wherein the inner radius of the bottom surface of the outer annular part of the upper mould portion is cooperatively shaped to correspond with both the outer radius of the bottom surface of the intermediate annular part of the upper mould portion and the outer radius of the top surface of the outer annular part of the lower mould portion;
- wherein each of the inner annular part of the lower mould portion, the outer annular part of the lower mould portion, the inner annular part of the upper mould portion, the intermediate annular part of the upper mould portion, and the outer annular part of the upper mould portion are individually axially movable with respect to each other;
- and
- wherein the bottom surface of the intermediate annular part of the upper mould portion and the top surface of the outer annular part of the lower mould portion are cooperatively shaped.
27 more elements
A moulding apparatus for manufacturing a plastic container having a curled rim out of a sheet of plastic material, the moulding apparatus comprising upper and lower moulding means for receiving therein between the sheet of plastic material;
- wherein the lower moulding means comprises:
- a mould having a bottom and a first lower annular wall part, defining a bottom and circumferential wall, respectively, of a moulding cavity, wherein the first lower annular wall part has a first top surface having a first outer radius;
- and
- an outer annular lower mould part arranged around the first lower annular wall part, wherein the outer annular lower mould part has a second top surface having a second inner radius corresponding to the first outer radius, and having a second outer radius;
- wherein the upper moulding means comprises:
- a central mandrel arranged in a mandrel cavity;
- a first upper annular wall part defining a circumferential boundary of the mandrel cavity, wherein the first upper annular wall part has a first bottom surface having a third outer radius;
- a second upper annular wall part arranged around the first upper annular wall part, wherein the second upper annular wall part has a second bottom surface having a fourth inner radius corresponding to the third outer radius, and having a fourth outer radius corresponding to the second outer radius of the outer annular lower mould part;
- and
- a third upper annular wall part arranged around the second upper annular wall part, wherein the third upper annular wall part has a third bottom surface having a fifth inner radius corresponding to each of the fourth outer radius and the second outer radius of the outer annular lower mould part;
- wherein the third outer radius of the first upper annular wall part is larger than the first outer radius of the first lower annular wall part;
- wherein the first lower annular wall part, the outer annular lower mould part, the first upper annular wall part, the second upper annular wall part, and the third upper annular wall part are individually axially movable with respect to each other;
- and
- wherein the second bottom surface of the second upper annular wall part and the second top surface of the outer annular lower mould part have corresponding shapes selected to curve down the rim of the sheet of plastic material, the second bottom surface of the second upper annular wall part further configured to curl the curved rim.
11 more elements
Dependencies are inferred from the claim text.