EP0478051A2
Expired / Lapsed
EP
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Method for the manufacture, in a continuous process, of substrates for printed wire boards, and printed wire boards so manufactured
Assignee: AMP-AKZO LINLAM VOF
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Filing: 1991-09-16
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Granted: —
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Expires: 2011-09-16
Abstract
Abstract A method for the manufacture in a continuous process of a flat substrate from a fibres-reinforced matrix for a printed circuit, in which use is made of at least two moving layers of reinforcing fibres (5,11) and the fibres are positioned in at least two crossing directions, whereupon the filaments layers provided with matrix material, optionally together with one or more electrical conducting layers, such as a metal foil (20,21), and/or insulating layers on one or on either outer side, are passed through a preferably heated laminating zone, such as a double belt press (22,23), characterized in that use is made of filaments-containing layers made up of a plurality of mutually parallel filaments that are not bound in the form of a fabric and extend substantially linear.
Inventors
- 👤 Erik Middelman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:10
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/202; B29C70/28; B29C70/40; B29C70/50; B32; B32B; B32B38/00; B32B38/18; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; B29C67/00; B29C67/20; B29K; B29K2105/00; B29K2105/0076; B29L; B29L2031/00; B29L2031/34; B29L2031/3425; B32B2038/1891; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/0287
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
137 words
A method for the manufacture, in a continuous process, of a flat substrate for a printed wire board from a fibre-reinforced matrix, in which process at least two moving layers of reinforcing fibres are employed and fibres are disposed in at least two crossing directions, after which the layers of threads provided with matrix material are passed through a preferably heated laminating zone, such as a double belt press, and the laminate is provided on one or on either side with means for depositing electrically conductive traces, e.g., for deposition on the laminate of a copper foil that can be partially removed again by etching, characterized in that use is made of threads-containing layers composed of a plurality of mutually parallel threads which are not bonded in the form of a woven fabric and extend substantially rectilinearly.
Claim 2
Dependent Claim
41 words
A process according to claim 1, characterized in that the layers of threads are composed of a plurality of separate wholly unbonded reinforcing yarns, on which the matrix material is provided after the layers have been formed and prior to lamination.
Claim 3
Dependent Claim
59 words
A process according to claim 1, characterized in that use is made of layers of threads in the form of a self-sustaining fibre-reinforced matrix material, more particularly a prepreg, in which the fibres are made up of a plurality of threads which are not bonded in the form of a woven fabric and extend mutually parallel and substantially rectilinearly.
Claim 4
Dependent Claim
37 words
A process according to claim 1, characterized in that each of said layers of threads not bonded in the form of a woven fabric is deposited in a plane moving continuously in the production direction (0° direction).
Claim 5
Dependent Claim
56 words
A process according to claim 2, characterized in that each of said layers of threads not bonded in the form of a woven fabric and having threads not extending in the production direction is laid on a transport element moving continuously in the production direction (0° direction), more particularly with the aid of a laying unit.
Claim 6
Dependent Claim
32 words
A process according to claim 1, characterized in that at least 3, preferably 5 or 7 of said layers of threads not bonded in the form of a woven fabric are provided.
Claim 7
Dependent Claim
93 words
A process according to claim 6, characterized in that the overall amount of reinforcing fibres to be provided in one or more of said layers of threads not bonded in the form of a woven fabric in a particular angular direction, say in the production direction (0° direction), is virtually equal to the overall amount of reinforcing fibres to be provided in one or more layers of threads not bonded in the form of a woven fabric in some other angular direction, say at about right angles (90° direction) to the production direction.
Claim 8
Dependent Claim
25 words
A process according to claim 6, characterized in that the layers of threads are arranged in mirror image relationship relative to the plane of symmetry.
Claim 9
Dependent Claim
71 words
A process according to claim 6, characterized in that a substrate is composed of 3, 5, 7 or a higher uneven number of said layers of threads not bonded in the form of a woven fabric, with the threads being provided in superposed layers from one side of the substrate to the other successively in alternating angular directions of 0° and 90° or conversely vis-à-vis the production direction (= 0° direction).
Claim 10
Dependent Claim
62 words
A process according to claim 2, characterized in that the threads in each of said layers of threads not bonded in the form of a woven fabric are kept under tension at least just prior to being rigidly confined in the matrix, more particularly with the use of needle belts positioned on either side of the transport elements and moving with them.
Claim 11
Dependent Claim
22 words
A process according to claim 1, characterized in that each thread is composed of a, preferably virtually untwisted, bundle of continuous filaments.
Claim 12
Dependent Claim
26 words
A process according to claim 5, characterized in that all threads are fed to the corresponding laying units from thread or yarn packages in a creel.
Claim 13
Dependent Claim
52 words
A process according to claim 1, characterized in that in addition to said two or more layers of threads not bonded in the form of a woven fabric there are provided in mirror image relationship to the plane of symmetry one or more layers composed of a non-woven or a woven fabric.
Claim 14
Dependent Claim
64 words
A process according to claim 1, characterized in that upstream or downstream of the laminating zone an upper layer is applied to the substrate not coated with a metal foil, which upper layer contains a catalyst, e.g. palladium, promoting the precipitation of an electrically conductive metal, such as copper, and comprises at least one layer of a crosslinked polyamine polymer, more particularly polyethylene imine.
Claim 15
Dependent Claim
26 words
A process according to claim 1, characterized in that the matrix material contains a synthetic material based on a thermosetting synthetic material, such as epoxy resin.
Claim 16
Dependent Claim
123 words
A process according to claims 4 and 5, characterized in that a buffer system is employed, use being made of a sub-frame containing all the laying units for the different layers of threads, which sub-frame during normal operation moves temporarily against the production direction, say at a rate of 10% of the production rate, building up a certain buffer length of layers of threads, and in the case of a breakdown, e.g. a thread breakage, the laying units are stopped and the transport elements continue to move, optionally with their production rate temporarily reduced, say to 10% of the normal rate of output, after which, once the failure has been repaired, a certain buffer length of layers of threads is again built up.
Claim 17
Dependent Claim
111 words
A process for the manufacture of a multilayer printed wire board in a continuous process, which comprises a board provided on both sides with traces of, preferably, copper being provided on either side with a moving layer of reinforcing fibres, whereupon the board containing the layers of threads provided with matrix material is passed, optionally together with a metal foil on one or on either outer side, through a preferably heated laminating zone, for instance a double belt press, characterized in that use is made of threads-containing layers composed of a plurality of mutually parallel threads which are not bonded in the form of a woven fabric and extend substantially rectilinearly.
Claim 18
Dependent Claim
142 words
A process according to claim 17, characterized in that a first laminate of layers of threads is formed on a plane moving continuously in the production direction (0° direction), more particularly with the use of a moving transport element and laying units, next there is deposited on the first laminate of layers of threads a board provided on both sides with electrically conductive traces, and subsequently there is provided on the reverse side of the board a second laminate of layers of threads, with each laminate of layers of threads being composed of at least 3 of said layers of threads and the threads from superposed layers crossing at an angle of preferably 90°, 60° or 45°, after which the board provided on either side with a matrix material-containing laminate of layers of threads is passed through the preferably heated laminating zone.
Claim 19
Dependent Claim
60 words
A process according to claim 17, characterized in that the threads in each layer of threads not bonded in the form of a woven fabric are kept under tension at least just prior to being rigidly confined in the matrix, more particularly with the use of needle belts positioned on either side of the transport elements and moving with them.
Claim 20
Dependent Claim
56 words
A process according to claim 17, characterized in that in addition to said two or more layers of threads composed of threads not bonded in the form of a woven fabric there are provided in mirror image relationship relative to the plane of symmetry one or more layers composed of a non-woven or a woven fabric.
References Cited (Backward Citations)
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