US5474841A
Expired / Lapsed
US
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Polypropylene resin cellular molded article having a skin and production method therefor
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1993-04-23
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Granted: 1995-12-12
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Expires: 2013-04-23
Abstract
Abstract PCT No. PCT/JP93/00528 Sec. 371 Date Dec. 22, 1993 Sec. 102(e) Date Dec. 22, 1993 PCT Filed Apr. 23, 1993 PCT Pub. No. WO93/22129 PCT Pub. Date Nov. 11, 1993.A cellular molded article (11) of a polypropylene resin having a skin (8) was produced by placing a skin material (8) on the interior surface of a die A (13), clamping the die A (13) with a die B (14) to form a mold (7), then charging the mold (7) with pre-expanded particles of a polyethylene resin, pre-heating the pre-expanded particles using steam supplied through the vapor holes (4) of the die B (14) at a temperature lower than the temperature at which the pre-expanded particles are melt bonded together, then holding the pre-expanded particles in said steam, and next performing the main heating of the pre-expanded particles through the die B (14) at a temperature not less than the temperature at which the pre-expanded particles are melt bonded together. At the time of the main heating of the pre-expanded particles through the die B (14), the die A (13) may also be heated up as needed.
Inventors
- 👤 Kiyoshi Matsuki
- 👤 Izumi Ibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:24
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/14; B29C44/146; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B32B27/00; B32B27/06; B32B27/065; B32B27/30; B32B27/304; B32B27/32; B32B5/22; B32B5/24; B32B5/245; B29C44/3415; B29C44/3426; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2105/00; B29K2105/04; B29K2105/048; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2621/00; B29K2621/003; B29L; B29L2031/00; B29L2031/30; B29L2031/3005; B29L2031/3041; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A method for producing a cellular molded article of a polypropylene resin having a skin, comprising placing a skin material in the interior of die A, clamping the die A with a die B to form a mold, and then charging the mold with pre-expanded particles of a polypropylene resin, and after supplying steam through vapor holes of the die B to pre-heat the pre-expanded particles at a temperature which is lower than the temperature at which the pre-expanded particles are melt bonded together, holding the pre-expanded particles in said steam, and next performing main heating of the pre-expanded particles through the die B at a temperature which is not less than the temperature at which the pre-expanded particles are melt bonded together.
Claim 2
Independent Claim
123 words
A method for producing a cellular molded article of a polypropylene resin having a skin, comprising placing a skin material in the interior of die A, clamping the die A with a die B to form a mold, and then charging the mold with pre-expanded particles of a polypropylene resin, and after supplying steam through vapor holes of the die B to pre-heat the pre-expanded particles at a temperature which is lower than the temperature at which the pre-expanded particles are melt bonded together, holding the pre-expanded particles in said steam, and next performing main heating of the pre-expanded particles through the die B at a temperature which is not less than the temperature at which the pre-expanded particles are melt bonded together.
Claim 3
Dependent Claim
43 words
The method for producing a cellular molded article of a polypropylene resin having a skin of claim 1 wherein at the time of the main heating through the die B of the pre-expanded particles in said mold, the die A is heated up.
Claim 4
Dependent Claim
48 words
The method for producing a cellular molded article having a skin according to any one of claim 1 or 2, wherein after the step of pre-heating said pre-expanded particles are held in said steam, and subsequently moisture drain is removed, and then the main heating is carried out.
Claim 5
Dependent Claim
37 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein a skin material which has been molded in advance is used as said skin material.
Claim 6
Dependent Claim
45 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein after molding the skin material in the die A of said mold, the mold is charged with pre-expanded particles of a polypropylene resin.
Claim 7
Dependent Claim
91 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein said skin material is selected from a polyolefin resin sheet such as a polypropylene resin sheet, a polyvinyl chloride resin sheet, a sheet of another resin, a fiber-based sheet, a resin-impregnated fiber-based sheet, a laminated sheet of one sheet chosen from these said sheets with a polyolefin resin molded foam sheet, or a laminate of one sheet chosen from these said sheets with a polypropylene resin extruded foam sheet.
Claim 8
Dependent Claim
43 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein adhesive is applied to the face of said skin material at the side where the polypropylene resin pre-expanded particles are filled.
Claim 9
Dependent Claim
40 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein after placing a shape-preserving material in said die B, the die B is clamped with a die A.
Claim 10
Dependent Claim
40 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein after placing an insert material in said die B, the die B is clamped with the die A.
Claim 11
Dependent Claim
47 words
The method for producing a cellular molded article of a polypropylene resin having a skin according to claim 1 or 2, wherein on the face of the molded foam obtained by opening said mold is provided either or both of a shape-preserving material and an insert material.
References Cited (Backward Citations)
US5196151A
Cited
EP0477476A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |