Patent EP0700775A1 successfully refreshed from Google Patents.
EP0700775A1
Expired / Lapsed
EP
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Bent tube, method of and apparatus for manufacturing same
Assignee: Toray Industries Inc
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Filing: 1994-08-26
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Granted: —
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Expires: 2014-08-26
Abstract
Abstract An FRP bent tube comprises a reinforced fiber layer disposed on an inner side of the tube and a nonwoven fabric layer disposed on an outer side of the reinforced fiber layer and having a single yarn diameter of not more 20 µm and not more than 100 g/m² in METSKE. Thus the bent tube of fiber reinforced plastics has a good resin streak and deaeration upon forming, has less surface defect and an excellent strength quality and is suitable for rackets of fiber reinforced plastics.
Inventors
- 👤 Toshihide Sekido
- 👤 Ryoichi Matsuura
- 👤 Tetsuyuki Kyono
- 👤 Kazuhiko Nishimura
- 👤 Kosuke Yoshimura
- 👤 Shinya Isoi
- 👤 Haruo Obara
- 👤 Hiromitsu Kanamori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:46
CPC Classifications
B; B32; B32B; B32B1/00; B32B1/08; B62; B62K; B62K19/00; B62K19/02; B62K19/16; A; A63; A63B; A63B49/00; A63B49/02; A63B49/10; A63B49/11; A63B60/00; A63B60/06; A63B60/08
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
47 words
A curved pipe of fiber reinforced plastics material comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m².
Claim 2
Dependent Claim
25 words
The curved pipe according to claim 1, wherein said inner layer includes a unidirectionally aligned material, a woven fabric and/or a braid of reinforcing fibers.
Claim 3
Dependent Claim
55 words
The curved pipe according to claim 1, wherein said inner layer has four or less reinforcing fiber partial layers, each reinforcing fiber partial layer has plural laminae of reinforcing fiber materials and a C-shape cross section, and an opening of an inner reinforcing fiber partial layer is covered with an outer reinforcing fiber partial layer.
Claim 4
Dependent Claim
25 words
The curved pipe according to any of claims 1 to 3, wherein fibers forming said non-woven fabric have fiber lengths of 1 to 30 mm.
Claim 5
Dependent Claim
25 words
The curved pipe according to any of claims 1 to 4, wherein said outer layer is disposed over the full length of the curved pipe.
Claim 6
Dependent Claim
25 words
The curved pipe according to any of claims 1 to 5, wherein said outer layer is disposed over the full circumference of the curved pipe.
Claim 7
Dependent Claim
82 words
A process for producing a curved pipe of fiber reinforced plastics material comprising the steps of: placing a preform, formed by covering an expansive tube with a prepreg of reinforcing fibers and disposed on a high pressure-resistance tube, in a cavity of a mold; heating said mold as well as said preform; and pressing said preform to an inner wall surface of said cavity by pressurizing the inside of said high pressure-resistance tube at a pressure of not lower than 3 MPa.
Claim 8
Dependent Claim
38 words
The process according to claim 7, wherein a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m² is wound around said preform.
Claim 9
Dependent Claim
99 words
A process for producing a curved pipe of fiber reinforced plastics material comprising the steps of: placing a base material, formed by winding a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m² around a preform formed by covering an expansive tube with a prepreg of reinforcing fibers, in a cavity of a mold; heating said mold as well as said base material; and pressing said preform to an inner wall surface of said cavity by pressurizing the inside of said expansive tube.
Claim 10
Dependent Claim
97 words
A process for producing a curved pipe of fiber reinforced plastics material comprising the steps of: placing a base material, formed by winding a non-woven fabric having a single fiber diameter of not greater than 20 µ m and a weight per unit area of not greater than 100 g/m² around a preform formed by covering an expansive tube with reinforcing fibers, in a cavity of a mold; heating said mold as well as said base material; pressurizing the inside of said expansive tube; and injecting resin into said cavity while reducing the pressure in said cavity.
Claim 11
Independent Claim
68 words
An apparatus for producing a curved pipe of fiber reinforced plastics material comprising: a mold having a cavity in which a preform formed by covering an expansive tube with a prepreg of reinforcing fibers and disposed on a high pressure-resistance tube is placed; and means for supplying a pressurized medium of an incompressible fluid having a pressure of not lower than 3 MPa into said high pressure-resistance tube.
Claim 12
Independent Claim
63 words
An apparatus for producing a curved pipe of fiber reinforced plastics material comprising: a split mold having upper and lower molds and a cavity in which a preform formed by covering an expansive tube with a prepreg of reinforcing fibers is placed; means for supplying a pressurized medium into said expansive tube; and a core constructed dividably and provided in said lower mold.
Claim 13
Independent Claim
75 words
An apparatus for producing a curved pipe of fiber reinforced plastics material comprising: a split mold having upper and lower molds and a cavity in which a preform formed by covering an expansive tube with reinforcing fibers is placed; means for supplying a pressurized medium into said expansive tube; means for reducing the pressure in said cavity; means for injecting resin into said cavity; and a core constructed dividably and provided in said lower mold.
Claim 14
Dependent Claim
48 words
A racket made from a fiber reinforced plastics material comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m².
Claim 15
Dependent Claim
23 words
The racket according to claim 14, wherein reinforcing fibers are selected from the group consisting of carbon fibers, glass fibers and polyaramide fibers.
Claim 16
Dependent Claim
26 words
The racket according to claim 14 or 15, wherein said inner layer includes a unidirectionally aligned material, a woven fabric and/or a braid of reinforcing fibers.
Claim 17
Dependent Claim
58 words
The racket according to any of claims 14 to 16, wherein said inner layer has four or less reinforcing fiber partial layers, each reinforcing fiber partial layer has plural laminae of reinforcing fiber materials and a C-shape cross section, and an opening of an inner reinforcing fiber partial layer is covered with an outer reinforcing fiber partial layer.
Claim 18
Dependent Claim
30 words
The racket according to any of claims 14 to 17, wherein fibers forming said non-woven fabric are selected from the group consisting of carbon fibers, glass fibers and polyaramide fibers.
Claim 19
Dependent Claim
24 words
The racket according to any of claims 14 to 18, wherein fibers forming said non-woven fabric have fiber lengths of 1 to 30 mm.
Claim 20
Dependent Claim
26 words
The racket according to any of claims 14 to 19, wherein said outer layer is disposed on a portion other than a grip of the racket.
Claim 21
Dependent Claim
27 words
The racket according to any of claims 14 to 20, wherein said outer layer is disposed on a portion other than a groove portion for gut strings.
Claim 22
Dependent Claim
35 words
The racket according to any of claims 14 to 21, wherein a wood material or a honeycomb material is disposed at least partially inside of said inner layer provided on a frame and/or a yoke.
Claim 23
Dependent Claim
24 words
The racket according to any of claims 14 to 22, wherein said inner layer provided on a grip is covered with a wood material.
Claim 24
Dependent Claim
81 words
A process for producing a racket of fiber reinforced plastics material comprising the steps of: placing a preform, formed by covering an expansive tube with a prepreg of reinforcing fibers and disposed on a high pressure-resistance tube, in a cavity of a mold; heating said mold as well as said preform; and pressing said preform to an inner wall surface of said cavity by pressurizing the inside of said high pressure-resistance tube at a pressure of not lower than 3 MPa.
Claim 25
Dependent Claim
42 words
The process for producing a racket according to claim 24, wherein a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m² is wound around said preform.
Claim 26
Dependent Claim
98 words
A process for producing a racket of fiber reinforced plastics material comprising the steps of: placing a base material, formed by winding a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m² around a preform formed by covering an expansive tube with a prepreg of reinforcing fibers, in a cavity of a mold; heating said mold as well as said base material; and pressing said preform to an inner wall surface of said cavity by pressurizing the inside of said expansive tube.
Claim 27
Dependent Claim
95 words
A process for producing a racket of fiber reinforced plastics material comprising the steps of: placing a base material, formed by winding a non-woven fabric having a single fiber diameter of not greater than 20 µm and a weight per unit area of not greater than 100 g/m² around a preform formed by covering an expansive tube with reinforcing fibers, in a cavity of a mold; heating said mold as well as said base material; pressurizing the inside of said expansive tube; and injecting resin into said cavity while reducing the pressure in said cavity.
Claim 28
Dependent Claim
59 words
The process for producing a racket according to any of claims 24 to 27, wherein said preform or said base material is preformed by pressing said preform or said base material onto another mold having a shape corresponding to the shape of said cavity, before said preform or said base material is placed in said cavity of said mold.
Claim 29
Dependent Claim
38 words
The process for producing a racket according to any of claims 24 to 28, wherein a preformed yoke and/or a preformed grip is placed in said cavity of said mold together with said preform or said base material.
Claim 30
Independent Claim
67 words
An apparatus for producing a racket of fiber reinforced plastics material comprising: a mold having a cavity in which a preform formed by covering an expansive tube with a prepreg of reinforcing fibers and disposed on a high pressure-resistance tube is placed; and means for supplying a pressurized medium of an incompressible fluid having a pressure of not lower than 3 MPa into said high pressure-resistance tube.
Claim 31
Independent Claim
62 words
An apparatus for producing a racket of fiber reinforced plastics material comprising: a split mold having upper and lower molds and a cavity in which a preform formed by covering an expansive tube with a prepreg of reinforcing fibers is placed; means for supplying a pressurized medium into said expansive tube; and a core constructed dividably and provided in said lower mold.
Claim 32
Independent Claim
74 words
An apparatus for producing a racket of fiber reinforced plastics material comprising: a split mold having upper and lower molds and a cavity in which a preform formed by covering an expansive tube with reinforcing fibers is placed; means for supplying a pressurized medium into said expansive tube; means for reducing the pressure in said cavity; means for injecting resin into said cavity; and a core constructed dividably and provided in said lower mold.
References Cited (Backward Citations)
No citation records indexed.
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