EP0451447A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of forming synthetic resin formed articles
Assignee: Toyoda Gosei Co Ltd
•
Filing: 1991-01-30
•
Granted: —
•
Expires: 2011-01-30
Abstract
Abstract Disclosed is a method foforming a synthetic resin formed article (6) having a double-layer structure consisting of a base portion (27) and a covering portion (6) which covers an outer periphery of the base portion (27) and which has an inwardly curved portion for covering an end portion of the base portion (27). The method includes the steps of: forming a sheet-like material (15) into a predetermined shape by the vacuum forming to obtain a preliminary covering portion; trimming an end portion of the preliminary covering portion obtained in the previous step to obtain the covering portion of the formed article (6); setting the covering portion of the formed article on one of a pair of dies (12, 13, 22, 23) which constitute a press-type forming die (11, 21) with the curved portion of the covering portion being supported by a slide core (24) located at a forefront position; setting a molten resin (M) which is forming material of the base portion (27) into a gap between the one die and the other die in a state in which the covering portion of the formed article (6) is being set on the one die; clamping the press-type forming die in a state wherein the slide core (24) is in contact with the other die at the forefront position immediately after or in synchronism with the molten resin setting step and causing the molten resin (M) to set to form it; and opening the forming die and then removing the formed article (6) obtained in the clamping step from the press-type forming die (11, 21).
Inventors
- 👤 Keizo C/O Toyoda Gosei Co. Ltd. Ito
- 👤 Takashi C/O Toyoda Gosei Co. Ltd. Kato
- 👤 Shoji C/O Toyoda Gosei Co. Ltd. Sakaida
- 👤 Hikaru C/O Toyoda Gosei Co. Ltd. Ando
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:23
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/18; B29C43/183; B29C70/00; B29C70/68; B29C70/681; B29C70/683; B29C70/78; B29C2791/00; B29C2791/004; B29C2791/006; B29C2791/007; B29C2793/00; B29C31/00; B29C31/04; B29C51/00; B29C51/08; B29C51/082
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
253 words
A method of forming a synthetic resin formed article (6) having a double-layer structure consisting of a base portion (27) and a covering portion (6) which covers an outer periphery of said base portion (27) and which has an inwardly curved portion for covering an end portion of said base portion, characterized by the steps of: forming a sheet-like material (15) into a predetermined shape by the vacuum forming to obtain a preliminary covering portion; trimming an end portion of said preliminary covering portion obtained in the previous step to obtain said covering portion of said formed article (6); setting said covering portion of said formed article (6) on one of a pair of dies (22, 23) which constitute a press-type forming die with said curved portion of said covering portion (6) being supported by a slide core (24) located at a forefront position; setting a molten resin (M) which is a forming material of said base portion (27) into a gap between said one die and the other die in a state in which said covering portion of said formed article (6) is being set on said one die; clamping said press-type forming die (22, 23) in a state wherein said slide core (24) is in contact with said other die at the forefront position and causing said molten resin (M) to set to form it; and opening said forming die (22, 23) and then removing the formed article (6) obtained in said clamping step from said press-type forming die (22, 23).
Claim 2
Dependent Claim
53 words
A method of forming a formed article (6) according to claim 1, characterized in that said covering portion setting step includes setting of said covering portion on one of die surfaces, and that said molten resin setting step includes extrusion of said molten resin (M) onto the other die surface from an extruder.
Claim 3
Dependent Claim
65 words
A method of forming a formed article according to claim 1, characterized said covering portion setting step includes setting of said covering portion on one of die surfaces, and that said molten resin setting step includes injection of said molten resin (M) from said other die (23) in a state wherein said dies (22, 23) are disposed close to each other (in a half-clamped state).
Claim 4
Independent Claim
240 words
A method of forming a formed article (6) having a double-layer structure consisting of a base portion (27) and a covering portion which covers an outer periphery of said base portion, characterized by the steps of: forming a sheet-like material (15), made of a thermoplastic resin and having a surface layer and a foam layer, into a predetermined shape by the vacuum forming to obtain a preliminary covering portion using a two-part die (11, 21) one of which is connected to an evacuation means (32), said sheet-like material being heated, said foam layer located at a corner in said two-part die being compressed and thereby eliminated by said two-part die (11, 21); setting said covering portion of said formed article (6) obtained in previous step on one of a pair of dies (22, 23) which constitute a press-type forming die; setting a molten resin (M) which is a forming material of said base portion into a gap between said one die and the other die in a state in which said covering portion of said formed article (6) is being set on said one die; clamping said press-type forming die and causing said molten resin (M) to set in a gap between said covering portion and said other die to form it into said formed article (6); and opening said forming die (12, 22) and then removing the formed article obtained in said clamping step from said press-type forming die.
Claim 5
Independent Claim
321 words
A method of forming a formed article having a double-layer structure consisting of a base portion (27) and a covering portion (6) which covers an outer periphery of said base portion and which has an inwardly curved portion for covering an end portion of the base portion, characterized by the steps of: forming a sheet-like material (15), made of a thermoplastic resin and having a surface layer and a foam layer, into a predetermined shape by the vacuum forming to obtain a preliminary covering portion using a two-part die (11, 21) one of which is connected to an evacuation means (32), said sheet-like material (15) being heated, said foam layer located at a corner in said two-part die being compressed and thereby eliminated by said two-part die; trimming an end portion of said preliminary covering portion obtained in the previous step to obtain said covering portion of said formed article (6); setting said covering portion of said formed article (6) on one of a pair of dies (12, 13, 22, 23) which constitute a press-type forming die (11, 21) with said curved portion of said covering portion being supported by a slide core (24) located at a forefront position; setting a molten resin (M) which is a forming material of said base portion into a gap between said one die and the other die in a state in which said covering portion of said formed article (6) is being set on said one die; clamping said press-type forming die (11, 21) in a state wherein said slide core (24) is in contact with said other die at the forefront position and causing said molten resin (M) to set in a gap between said covering portion and said other die to form it into said formed article; and opening said forming die (22) and then removing the formed article (6) obtained in said clamping step from said press-type forming die (11, 21).
Claim 6
Dependent Claim
53 words
A method of forming a formed article according to claim 4, characterized in that said covering portion setting step includes setting of said covering portion on one of die surfaces, and that said molten resin setting step includes extrusion of said molten resin (M) onto the other die surface from an extruder (28).
Claim 7
Dependent Claim
67 words
A method of forming a formed article according to claim 4, characterized in that said covering portion setting step includes setting of said covering portion on one of die surfaces, and that said molten resin setting step includes injection of said molten resin (M) from said other die (23) in a state wherein said dies (22, 23) are disposed close to each other (in a half-clamped state).
Claim 8
Dependent Claim
111 words
A method of forming a formed article according to claim 1, characterized in that said forming step includes the steps of: softening said sheet-like material (15) by heating it in a state wherein a peripheral edge thereof is being gripped by a clamp (14); setting the softened sheet-like material on a lower die of said vacuum forming die which consists of an upper die and said lower die by removing part or all of said clamp which grips the peripheral edge of said sheet-like material; and clamping said vacuum forming die while sealing it by gripping the overall periphery of said sheet-like material by means of said upper and lower dies.
Claim 9
Dependent Claim
65 words
A method of forming a formed article according to claim 8, characterized in that said vacuum forming die comprises a porous die in which air holes located on the peripheral edge thereof are closed, and that said setting step includes a step of setting an edge of said sheet-like material (15) at the portion of said vacuum forming die whose air holes (13C) are closed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.