EP0249939A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for press molding thermoplastic resins
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1987-06-16
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Granted: —
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Expires: 2007-06-16
Abstract
Abstract A multi-layer molded article comprising a thermoplastic resin body having plurality of ribs and/or bosses on one side and a layer of a foam which is laminated on the side of the thermoplastic resin body having ribs and/or bosses is easily produced by a press molding method which comprises steps of supplying a foam between upper and lower halves of a mold, one of which has plurality of slits and/or holes corresponding to the ribs and/or bosses to be formed, supplying a quantity of a plasticized thermoplastic resin melt between the already supplied foam and the half of the mold not having any slit or hole, moving at least one half of the mold during supplying the thermoplastic resin or just after completion of supply of the thermoplastic resin to press mold the thermoplastic resin so that the plasticized thermoplastic resin breaks at least a part of areas of the foam on the slits and/or holes of the half of the mold to flow into the slits and/or holes and to form the ribs and/or bosses.
Inventors
- 👤 Shohei Masui
- 👤 Yoshiaki Togawa
- 👤 Kanemitsu Oishi
- 👤 Kiyoshi Mitsui
- 👤 Nobuhiro Usui
- 👤 Shigeyoshi Matubara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 12:15
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/18; B29C43/021; B29C44/00; B29C44/02; B29C44/10; B29C44/34; B29C44/56; B29K; B29K2105/00; B29K2105/04; B29K2105/25; B29K2105/253; B29L; B29L2031/00; B29L2031/772
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A method for producing a multi-layer molded article comprising a thermoplastic resin body having a plurality of ribs and/or bosses on one side and a layer of a foam which is laminated on the side of the thermoplastic resin body having the ribs and/or bosses by press molding, which method comprises the steps of supplying a sheet of a foam between upper and lower halves of a mold, one of which has a plurality of slits and/or holes corresponding to the ribs and/or bosses to be formed, supplying a quantity of a plasticized thermoplastic resin melt between the already supplied foam and the half of the mold not having any slit or hole, moving at least one half of the mold during supplying the thermoplastic resin or just after completion of supply of the thermoplastic resin to press mold the thermoplastic resin so that the plasticized thermoplastic resin breaks at least a part of areas of the foam on the slits and/or holdes of the half of the mold to flow into the slits and/or holes and to form the ribs and/or bosses.
Claim 2
Independent Claim
183 words
A method for producing a multi-layer molded article comprising a thermoplastic resin body having a plurality of ribs and/or bosses on one side and a layer of a foam which is laminated on the side of the thermoplastic resin body having the ribs and/or bosses by press molding, which method comprises the steps of supplying a sheet of a foam between upper and lower halves of a mold, one of which has a plurality of slits and/or holes corresponding to the ribs and/or bosses to be formed, supplying a quantity of a plasticized thermoplastic resin melt between the already supplied foam and the half of the mold not having any slit or hole, moving at least one half of the mold during supplying the thermoplastic resin or just after completion of supply of the thermoplastic resin to press mold the thermoplastic resin so that the plasticized thermoplastic resin breaks at least a part of areas of the foam on the slits and/or holdes of the half of the mold to flow into the slits and/or holes and to form the ribs and/or bosses.
Claim 3
Dependent Claim
69 words
The method according to claim 1, wherein the sheet of the foam has an original thickness which is substantially the same as the ratio of the depth of the slit to the compression-recover ratio of the foam under the molding conditions which compression-recover ratio means the ratio of the thickness of the foam of the produced article to that of the sheet of the foam before being press molded.
Claim 4
Dependent Claim
42 words
The method according to claim 1, wherein the half of the mold having the slits and/or holes is the lower half of the mold, and the upper half of the mold has a feed passage through which the resin melt is supplied.
Claim 5
Dependent Claim
42 words
The method according to claim 1, wherein the half of the mold having the slits and/or holes is the upper half of the mold, and the lower half of the mold has a feed passage through which the resin melt is supplied.
Claim 6
Independent Claim
120 words
An apparatus for producing a multi-layer molded article comprising a thermoplastic resin body having a plurality of ribs and/or bosses on one side and a layer of a foam which is laminated on the side of the thermoplastic resin body having the ribs and/or bosses by press molding, which apparatus comprises a mold consisting of one half (5) attached to one platen of a press and another half (6) attached to the other platen of the press wherein one of the halves (5) or (6) of the mold has slits (7) for forming the ribs and/or holes for forming the bosses and the other half of the mold has a feed passage (8) through which the resin melt is supplied.
Claim 7
Independent Claim
120 words
An apparatus for producing a multi-layer molded article comprising a thermoplastic resin body having a plurality of ribs and/or bosses on one side and a layer of a foam which is laminated on the side of the thermoplastic resin body having the ribs and/or bosses by press molding, which apparatus comprises a mold consisting of one half (5) attached to one platen of a press and another half (6) attached to the other platen of the press wherein one of the halves (5) or (6) of the mold has slits (7) for forming the ribs and/or holes for forming the bosses and the other half of the mold has a feed passage (8) through which the resin melt is supplied.
References Cited (Backward Citations)
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