Method for manufacturing decorative molding and mold for the method

Patent metadata

Field	Value
Publication number	US-11090846-B2
Application number	US-201816120980-A
Country	US
Kind code	B2
Filing date	Sep 4, 2018
Priority date	Jun 29, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A method for manufacturing a decorative molding in which a transfer layer is transferred onto an injection molded product from a transfer sheet simultaneously with performing of injection molding in which at least one knockout pin in a second half-mold is caused to retreat to clamp a first half-mold and the second half-mold together; and the at least one knockout pin is made to advance so that the first half-mold and the second half-mold are released from each other until the second half-mold and the first half-mold open to a predetermined interval, while the transfer layer in a non-transfer area that is to remain on the transfer sheet is pushed against the first half-mold.

First claim

What is claimed is:

1. A mold, comprising:
a first half-mold on which a transfer sheet is to be placed, the first half-mold including a first half-molding surface adapted to form a primary surface of an injection molded product, the sheet including a transfer layer that has a transfer area to be transferred onto the injection molded product at the same time of the injection molding of the product and a non-transfer area that is not to be transferred onto the injection molded product; and
a second half-mold that is to be clamped to the first half-mold, the second half-mold including an insert adapted to form at least one opening in the injection molded product and a plurality of knockout pins in the insert and configured to advance and retreat by a spring or an actuator;
when the first half-mold and the second half-mold are clamped, the insert makes close contact with the first half-molding surface with the transfer sheet sandwiched between the insert and the first half-molding surface, the plurality of knockout pins are pushed by the first half-mold and retract to cause the spring to elastically deform, when the first half-mold and the second half-mold are released from each other, the plurality of knockout pins are pushed by the spring to protrude from the at least one opening and push the non-transfer area against the first half molding surface until the first half-mold and the second half-mold open to a predetermined interval, or
when the first half-mold and the second half-mold are clamped, the insert makes close contact with the first half-molding surface with the transfer sheet sandwiched between the insert and the first half-molding surface, the plurality of knockout pins are retracted by the actuator before or during mold clamping, when the first half-mold and the second half-mold are released from each other, the plurality of knockout pins are pushed by the actuator to protrude from the at least one opening and push the non-transfer area against the first half molding surface until the first half-mold and the second half-mold open to a predetermined interval.

2. The mold according to claim 1 , wherein the first half-molding surface includes a first area corresponding to the at least one opening in the injection molded product,
the second half-mold includes, in a second half-molding surface used for forming another primary surface of the injection molded product, a second area to be making close contact with the first area, with the transfer sheet sandwiched between the areas, when the molds are clamped together, and the second area further includes at least one of the plurality of knockout pins arranged therein, and
the at least one knockout pin arranged in the second area protrudes from the at least one opening to push the non-transfer area against the first area of the first half-mold when the first half-mold and the second half-mold are released from each other.

3. The mold according to claim 2 , wherein the plurality of knockout pins includes a plurality of first knockout pins, and
the plurality of first knockout pins are arranged in at least one opening in the second half-mold.

4. The mold according to claim 3 , wherein the plurality of knockout pins includes a second knockout pin having a tip surface area and a third knockout pin that has a tip surface area smaller than that of the second knockout pin, the tip surfaces configured to abut against the transfer sheet.

5. The mold according to claim 4 , wherein the plurality of knockout pins includes a fourth knockout pin that has a tip surface to abut against the transfer sheet and a base portion extending inward toward the second half-mold and having a cross-sectional area that is orthogonal to a release direction and smaller than an area of the tip surface.

6. The mold according to claim 5 , wherein
the first half-mold includes a third area and a fourth area;
the second half-mold includes a fifth area that corresponds to the third area and a sixth area that corresponds to the fourth area, and a position of contact between the third area and the fifth area via the transfer sheet when the molds are clamped together is located closer toward a rear surface of the first half-mold than a position of contact between the fourth area and the sixth area;
the plurality of knockout pins includes a fifth knockout pin arranged in the fifth area and a sixth knockout pin arranged in the sixth area, and
the first half-mold and the second half-mold are configured such that, at substantially the same time as when the fifth knockout pin pushes the transfer sheet against the third area, the sixth knockout pin pushes the transfer sheet against the fourth area.

7. The mold according to claim 2 , wherein
the first half-mold includes an area that has a non-flat shape in the first half-molding surface, and
the plurality of knockout pins includes a knockout pin that is arranged in the area that has a non-flat shape and that has a tip surface, the tip surface having a non-flat shape that is substantially the same as that of the area that has a non-flat shape.

8. The mold according to claim 3 , wherein
the first half-mold includes an area that has a non-flat shape in the first half-half-molding surface, and
the plurality of knockout pins includes a knockout pin that is arranged in the area that has a non-flat shape and that has a tip surface, the tip surface having a non-flat shape that is substantially the same as that of the area that has a non-flat shape.

9. The mold according to claim 1 , wherein the plurality of knockout pins includes a first knockout pin having a tip surface area and a second knockout pin that has a tip surface area smaller than that of the first knockout pin, the tip surfaces configured to abut against the transfer sheet.

10. The mold according to claim 1 , wherein the plurality of knockout pins includes a knockout pin that has a tip surface to abut against the transfer sheet and a base portion extending inward toward the second half-mold and having a cross-sectional area that is orthogonal to a release direction and smaller than an area of the tip surface.

11. The mold according to claim 3 , wherein the plurality of knockout pins includes a knockout pin that has a tip surface to abut against the transfer sheet and a base portion extending inward toward the second half-mold and having a cross-sectional area that is orthogonal to a release direction and smaller than an area of the tip surface.

12. The mold according to claim 1 , wherein
the first half-mold includes a third area and a fourth area;
the second half-mold includes a second area, a fifth area that corresponds to the third area and a sixth area that corresponds to the fourth area, and a position of contact between the third area and the fifth area via the transfer sheet when the molds are clamped together is located closer toward a rear surface of the first half-mold than a position of contact between the fourth area and the sixth area;
the plurality of knockout pins includes a fifth knockout pin arranged in the fifth area and a sixth knockout pin arranged in the sixth area, and
the first half-mold and the second half-mold are configured such that, at substantially the same time as when the fifth knockout pin pushes the transfer sheet against the third area, the sixth knockout pin pushes the transfer sheet against the fourth area.

13. The mold according to claim 3 , wherein
the first half-mold includes a third area and a fourth area;
the second half-mold includes a fifth area that corresponds to the third area and a sixth area that corresponds to the fourth area, and a position of contact between the third area and the fif

Assignees

• Nissha Co Ltd

Inventors

• Taniguchi Takafumi
• Nakanishi Tatsuya
• Matsui Takafumi

Classifications

• B29C45/14827 Primary

  using a transfer foil detachable from the insert · CPC title

• B29L2031/3481

  Housings or casings incorporating or embedding electric or electronic elements · CPC title

• B29C45/401

  Ejector pin constructions or mountings · CPC title

• B29C45/40

  Removing or ejecting moulded articles · CPC title

• B29C45/4005

  Ejector constructions; Ejector operating mechanisms (B29C45/44 takes precedence) · CPC title