MOLD AND METHOD FOR MOLDING RESIN FOAMED MOLDING

• US 20110062614A1
• Filed: 05/20/2009
• Published: 03/17/2011
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: Archem, Inc.
• Original Assignee: Bridgestone Corporation
• Inventors: Motomura, Tomoyuki, Suenaga, Kazuyuki
• Granted Patent: US 9,180,607 B2
• Time in Patent Office: Days
• US Class Current: 264/41
• CPC Class Codes: B29C 33/10 with incorporated venting means
• CPC Class Codes: B29C 37/006 Degassing moulding material or draining off gas during moulding venting means in moulds B29C33/10
• CPC Class Codes: B29C 44/587 with a membrane, e.g. for pressure control
• CPC Class Codes: B29C 44/588 with means for venting, e.g. releasing foaming gas
• CPC Class Codes: Y10S 425/812 Venting

Abstract

Provided is a mold which can be configured to be able to properly exhaust gas from a cavity and to prevent resin from entering into a vent hole, and a method for molding resin foamed molding using the mold. The mold 1 includes a lower mold 2, an upper mold 4, and a core mold 3 mounted directly under the upper mold 4. The core mold 3 is provided at wall portions 3b, 3c thereof with respective vent holes 6. Annexed members 7 are detachably attached to the outer surface sides of the wall portions 3b, 3c. Each of the annexed members 7 has a tubular shape having an air passage with a shape of a small passage which is in communication with the vent hole, and the sectional dimension of the passage of at least a part of the air passage is smaller than that of the vent hole 6. A nonwoven cloth 10 is attached to the core mold 3 so as to cover each surface thereof facing the cavity. The end portions of the nonwoven cloth 10 also cover the wall portions 3b, 3c, thereby covering the vent hole 6 from the cavity side.

Claims

1. A mold characterized in having a cavity enclosed by at least an upper mold and a lower mold, the mold designed for resin foam moldings including the cavity comprising:

a cavity main portion to be supplied with foam resin material; and

a cavity end portion to be filled with expanding resin which starts foaming in the cavity main portion, wherein

the cavity end portion is provided at a vertical surface thereof with a vent hole.

2. The mold according to claim 1, wherein an annexed member having an air passage in communication with the vent hole is detachably installed.

3. The mold according to claim 2, wherein at least a part of the sectional dimension of the air passage is smaller than that of the vent hole.

4. The mold according to claim 1, wherein the vent hole is covered at cavity side thereof with an air permeability material.

5. The mold according to claim 4, wherein the air permeability material is made of a nonwoven cloth, a slab, a press felt, or a urethane compressed chip material.

6. The mold according to claim 4, wherein the mold includes a core mold, the vent hole is provided in the core mold, and the air permeability material is attached to the core mold.

7. The mold according to claim 1, wherein the mold is used for molding a seat pad for vehicles;

the cavity end portion is disposed above the cavity main portion, and the cavity main portion and the cavity end portion communicate with each other through a cavity side portion; and

the vent hole is provided at a vertical surface in an opposite side of the cavity side portion.

8. The mold according to claim 7, wherein the vent hole is provided at the vertical surface furthest from the cavity side portion.

9. A method for molding a resin foamed molding using the mold in claim 1.