WO1990012668A1 - Apparatus and method for fabricating printed circuit boards - Google Patents
Apparatus and method for fabricating printed circuit boards Download PDFInfo
- Publication number
- WO1990012668A1 WO1990012668A1 PCT/US1990/002139 US9002139W WO9012668A1 WO 1990012668 A1 WO1990012668 A1 WO 1990012668A1 US 9002139 W US9002139 W US 9002139W WO 9012668 A1 WO9012668 A1 WO 9012668A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate surface
- substrate
- printed circuit
- conductor
- dimensional
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/20—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern
- H05K3/207—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern using a prefabricated paste pattern, ink pattern or powder pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
- B30B15/022—Moulds for compacting material in powder, granular of pasta form
- B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/06—Platens or press rams
- B30B15/061—Cushion plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/18—Handling of layers or the laminate
- B32B38/1825—Handling of layers or the laminate characterised by the control or constructional features of devices for tensioning, stretching or registration
- B32B38/1833—Positioning, e.g. registration or centering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3425—Printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0284—Details of three-dimensional rigid printed circuit boards
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
- H05K1/095—Dispersed materials, e.g. conductive pastes or inks for polymer thick films, i.e. having a permanent organic polymeric binder
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0275—Fibers and reinforcement materials
- H05K2201/0284—Paper, e.g. as reinforcement
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09009—Substrate related
- H05K2201/09118—Moulded substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/06—Lamination
- H05K2203/068—Features of the lamination press or of the lamination process, e.g. using special separator sheets
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/386—Improvement of the adhesion between the insulating substrate and the metal by the use of an organic polymeric bonding layer, e.g. adhesive
Definitions
- the present invention relates to a method and apparatus for transmitting uniformly applied pressure to a patterned release media to obtain a composite having a conductor, graphics and/or coating uniformly bonded to a substrate.
- This invention particularly relates to formation of a printed circuit board.
- the art area has been directed to forming circuit boards by techniques other than transferring a conductor to a substrate used to form the circuit board.
- the art area has been concerned principally with lamination of multilayered circuit boards.
- United States Patent No. 4,029,845 relates to a thermosetting resin in which heat and pressure are used to form a composite circuit board.
- the reference only discloses forming the base board and does not teach forming printed circuit elements on that baseboard.
- the reference refers to an additive process for manufacturing a printed circuit board without explanation of that teaching.
- United States Patent No. 4,180,608 teaches heat and pressure used to form a composite printed circuit board.
- the reference uses a carrier layer for resin but not a printed circuit as in the present invention. A lamination is formed as taught in the art.
- U.S. Patent No. 4,148,597 teaches an apparatus comprising a rigid container, pads of silicone rubber in the container used to exert pressure on the part to be formed and an expandable diaphragm which controls the pressure exerted on the part to be molded.
- the patent teaches such a method and apparatus useful to form complex-shaped parts from fiber reinforced plastic composite material.
- U.S. Patent No. 4,243,368 also teaches a method and apparatus for making plastic articles from plastic particles utilizing heat and pressure applied using a flexible diaphragm to apply even fluid pressure.
- a layer of plastic particles is spread to a depth substantially equal to or slightly greater than that of a cavity formed on top of a platen.
- An air release means which can be a wire cloth or screen, is located over the particles during compression.
- U.S. Patent No. 4,670,084 teaches an apparatus for applying decorative images to members wherein sheets containing the images are overlaid on the members and maintained in pressurized engagement while the sheets* and the members are- heated. Vacuum is used to maintain the pressurized engagement.
- U.S. Patent No. 4,636,275 teaches an integrated circuit package fabricated by assembling a stack comprising a plurality of thin flat epoxy glass layers, adhesive layers between those layers and a cavity. A conductor is not being transferred to a substrate. The stack is covered with an elastic bladder and is laminated by forcing fluid into the bladder at a temperature and pressure which causes the bladder to push against the surfaces of the cavity. This dams the adhesive from flowing into the bonding pads.
- This invention overcomes disadvantages found in the prior art which relates to laminating conductor to substrates, particularly those substrates which have complex shapes.
- This invention relates to a uniform pressure transmitting apparatus for uniformly laminating a conductor to an at least two-dimensional substrate surface comprising (a) a first platen means having a first cavity means, the first cavity means substantially confining a mold which is a mirror image of the at least two-dimensional substrate surface, (b) a second platen means containing a second cavity means which substantially confines the thickness of the substrate, (c) pressurization means for compressing a conductor positioned on the substrate surface using the first platen means, and (d) laminating means to bond the conductor to the substrate surface.
- This invention also relates to a uniform pressure transmitting apparatus for uniformly laminating a printed circuit to an at least two-dimensional substrate surface composed of a polyarylsulfone polymer comprising (a) a first platen means having a first cavity means, the first cavity means substantially confining a mold which is a mirror image of the at least two- dimensional substrate surface, (b) a second platen means containing a second cavity means dimensioned to confine a substantial portion of the thickness of the substrate composed of polyarylsulfone polymer, (c) pressurization means for compressing a printed circuit positioned on the substrate surface using the first cavity means, and (d) laminating means to bond the printed circuit to the substrate surface to form a circuit board.
- This invention further relates to a method for uniformly laminating a conductor to an at least two- dimensional substrate surface comprising inserting a substantial portion of the thickness of the substrate in a cavity means of a platen means, positioning a conductor on the at least two-dimensional substrate surface, applying a uniform pressure to the conductor and the substrate surface using another platen means containing another cavity means which substantially confines a mold which is a mirror image of the at least two-dimensional substrate surface, and laminating the conductor to the substrate surface.
- This invention also further relates to a method for uniformly laminating a printed circuit to an at least two-dimensional substrate surface comprising inserting a substantial portion of the thickness of a substrate composed of polyarylsulfone polymer in a cavity means of a platen means, positioning a printed circuit on the at least two-dimensional substrate surface, applying a uniform pressure to the positioned printed circuit and the substrate surface using another platen means containing another cavity means which substantially confines a mold which is a mirror image of the at least two-dimensional substrate surface, and laminating the printed circuit to the substrate surface to form a printed circuit.
- Fig. 1 shows a schematic depiction of the uniform pressure apparatus of the present invention
- Fig. 2 shows a printed circuit on a substrate
- Figs. 3A and 3B show applicants' earlier press and transfer method with Fig. 3B further showing use of pins to obtain registration of conductor on the substrate;
- Fig. 4 shows results of adhesion tests performed on a conductive surface adhered to a substrate prepared using the earlier press and method of Figs. 3A and 3B;
- Fig. 5 shows the press and transfer method of this invention.
- Fig. 6 shows the results of adhesion tests performed on a composite prepared according to the press and method of Fig. 5.
- This invention relates to a method and apparatus for uniformly applying pressure to at least ' one side of a substrate or circuit board to laminate a conductor or printed circuit on it.
- the conductor can include a circuit alone or combined with other components, for example, adhesive, solder mask, graphics and/or transfer media.
- a release surface carrying at least a circuit covered by adhesive is contacted with a substrate such that the circuit is adjacent the substrate surface separated therefrom by adhesive. Sufficient heat and pressure are applied to form a composite structure, using the apparatus in Fig. 3 or Fig..5, whereby the adhesive is reacted. Thus, the circuit is transferred from the release surface and bonded to the substrate surface. In some cases, only partial curing and/or reaction need be obtained. The release surface is then separated from the composite structure.
- the release surface and the substrate surface are contacted at a temperature of from about 100°C to about 230°C and preferably 140°C to 190°C.
- the surfaces are contacted at a pressure of from about 200 psi to about 1,200 psi and preferably 500 psi to 700 psi but not so great as to cause distortion of components. A pressure of 600 psi is preferred.
- the substrate may be preheated to avoid distortion. Pressure can be applied for about 0.25 to 5 minutes, preferably 3 minutes.
- the composite when the composite is formed, they are subjected to sufficient pressure during lamination to cause some compaction of the printed circuit. This causes further densification of the printed circuit, improving its conductive qualities. It has been noted that such compaction does not result in smearing of the electric circuit. Thus, the fine edges achieved in printing the electric circuit are maintained. Preferably, compaction of 25 to 40% of original printed electric pathway thickness is obtained.
- This invention overcomes many deficiencies in printed circuitry fabrication in terms of simplicity, ease of operation, functional utilization and performance.
- the substrate may be any known dielectric, that is, insulating or non-conducting substrate. The related application referred to above provides a detailed list of suitable substrates which can be used in this invention.
- Suitable substrates include those fabricated from thermoset and thermoplastic materials and their mixtures. Preferred substrates will be taught below. They can have two or three dimensional surfaces. Thermoplastics, in general, exhibit a more complex range of chemical, thermal, and mechanical behavior than traditional thermoset printed circuit board laminates. This makes material selection for printed circuit uses even more critical. Current resin systems typically exhibit one or two desired characteristics but in general lack overall property balance to make them good printed circuit support candidates. Resin deficiencies become readily apparent during assembly operations where substrate warpage, bubbling, dimensional instability and printed circuit delamination are common occurrences.
- polyarylsulfone resins offer a highly desirable property balance for circuit board uses where excellent dimensional stability, warp resistance and bonding of circuit and substrate are requirements.
- Polyarylsulfone resins are characterized by inherently high heat distortion temperatures, excellent dimensional stability, creep resistance, low loss AC dielectric properties, and high mechanical strength.
- Typical Properties of Polyarylsulfone Resins Property Units Typ ⁇ ical Property Tensile Strength psi 13,400 Elongation to Break % 2.2
- Polyarylsulfone resins are easily processed utilizing standard injection molding machinery and practice. Prior to molding, resins should be dried to obtain optimum performance in a dehumidified hopper drier or circulating air oven. Utilization of a hopper drier is preferred with an inlet air temperature in the 149- 163°C range and an outlet temperature not less than 135°C.
- pellets When tray drying is utilized, pellets should be spread into a layer 1-2" in depth. It is important in all cases that the pellets reach and maintain a minimum temperature of 135°C for 3-4 hours. Dried resin should be molded promptly and handled carefully to preclude moisture reabsorption.
- the rheological characteristics of polyarylsulfone resins provide excellent flow for filling thin and intricate wall sections typically encountered in printed wiring boards, chip carriers, and related devices. The resins process readily at stock temperatures in the 360-382°C ranges (wave soldering grade). Mold temperatures of 110-157°C are used typically with the resin for wave solderable moldings. Clean polyarylsulfone resin scrap may be reground and utilized in fabrication, provided it is properly dried and kept free of contamination.
- Polyarylsulfone produces warp-free moldings that are dimensionally stable both prior to and following the transfer process. Transferred circuitry exhibits tenacious adhesion to the resin as transferred, .and maintains its adhesion following wave soldering.
- Additives which may be used with the thermoplastic and/or thermosetting resin for making the printed circuit board include reinforcing and/or non- reinforcing fillers such as wollastonite, asbestos, talc, alumina, clay, mica, glass beads, fumed silica, gypsum and the like; and reinforcement fibers such as aramid, boron, carbon, graphite, and glass. Glass fiber is the most widely used reinforcement in the form of chopped or milled strands, ribbon, yarn, filaments, or woven mats. Mixtures of reinforcing and non-reinforcing fillers may be used, such as a mixture of glass fibers and talc or wollastonite.
- reinforcing and/or non- reinforcing fillers such as wollastonite, asbestos, talc, alumina, clay, mica, glass beads, fumed silica, gypsum and the like
- reinforcement fibers such as aramid, boron, carbon, graphite,
- reinforcing agents are used in amounts of from about 10 to about 80 weight percent, whereas the non-reinforcing fillers are used in amounts of up to 50 weight percent.
- Other additives include stabilizers, pigments, flame retardants, plasticizers, processing aids, coupling agents, lubricants, mold release agents, and the like. These additives are used in amounts which achieve the desired result.
- Polyarylsulfone is the preferred thermoplastic polymer substrate of the invention. It is an amorphous thermoplastic polymer containing units of the formula:
- R55 is independently hydrogen, C-_ to Cg alkyl to C4 to C8 cycloalkyl, X' is independently R56
- R ⁇ and R57 are independently hydrogen or Ci to Cg alkyl, or
- R58 and R59 are independently hydrogen or Ci to Cg alkyl, and a-[ is an integer of 3 to 8; -S-, -0-, or -fH+, a is an integer of 0 to 4 and n is independently an integer of 1 to 3 and wherein the ratio of unit (I) to the sum of units (II) and/or (III) is greater than 1.
- the units are attached to each other by an -0- bond.
- a preferred polymer of this invention contains units of the formula:
- Another preferred polyarylsulfone of this invention contains units of the formula:
- the polyarylsulfone may be random or may have an ordered structure.
- the polyarylsulfones of this invention have a reduced viscosity of from about 0.4 to greater than 2.5, as measured in N-methylpyrolidone, or other suitable solvent, at 25°C.
- Laminating Apparatus Fig. 1 shows an apparatus for uniformly applying pressure to laminate a conductor or printed circuit to a substrate.
- the apparatus comprises heated platens 10 and 11, which may be differently disposed. Each of the platens has a cavity 12 and 13, respectively. The platens are heated in a conventional manner which is not shown.
- Platen 11 contains a mold 14 which is confined in the cavity 13. Mold 14 can be made of silicone rubber and is the mirror image of substrate 15 located in cavity 12 in platen 10. The mold can be made of other conventional high temperature elastomeric materials known in the art.
- the exposed surface of mold 14 preferably lies in the plane of the exposed surface of platen 11. The mold and substrate can be retained in their respective cavities using any conventional means.
- the surface of the substrate 15 can be two or three dimensional.
- the mold is located so that during compression, movement lateral to the normal direction of compression of the platens is avoided to the extent that uniform pressure is applied across the surface of the substrate, that is, the mold is substantially confined.
- a portion of the substrate should project beyond the upper surface of platen 10 to facilitate uniform transfer and to compensate for any misalignment of platens. Only as much of board as necessary need project so that the board • cannot distort or move laterally during compression. Thus the cavity substantially confines the board.
- registration pins 16 and attendant openings on the opposing platen which facili ⁇ tate aligning the opposing or upper mold with the sub- strate 15.
- Conventional pressurization means which cause platen movement and compression is used but not shown. In operation, the platens are spread apart with the platen 11 containing the' silicone rubber mold 14. A plastic substrate 15 is inserted into cavity 12 in platen 10. Thereafter a release or transfer paper 17, carrying a printed circuit and adhesive, is placed over the substrate 15.
- Conventional pressurization means causes at least one platen to move toward the other. The alignment of the platens is facilitated utilizing registration pins 16 on one platen which mates with a complementary apature on the opposing platen. Lamination occurs at conventional temperatures and pressures by heating the platens utilizing conventional heating means (not shown). Thereafter, the printed circuit, which is completely or partially laminated to the substrate, is removed as a product and the release or transfer paper removed.
- the basic components carried by the release or transfer medium or paper are the conductor and adhesive.
- the first-mentioned component is informational or educational legends for the circuit board.
- This transfer medium facilitates manufacture of the circuit board in an expeditious manner.
- one or more components can be applied to the circuit board separately.
- the legending can be applied directly to the board or multiple transfers of circuits can be done to the same circuit board.
- This apparatus has the advantage of uniformly applying pressure across the entire surface of the substrate, whether it is two-dimensional or three- dimensional in shape. That is, the surface upon which 14
- the printed circuit is applied can be flat or three- dimensional.
- the confinement of the silicone rubber mold 14 in the cavity 13 restricts movement of the mold in the cavity and is a factor in promoting the uniform pressure 5 and superior lamination of the printed circuit across the surface of the substrate.
- the cavity 12 further promotes the uniform application of pressure because the substrate is substantially confined in the cavity 12 which precludes its movement, especially laterial
- circuitry can be made to take place over planar or three-dimensional substrates to the extent the surface is "developable".
- a three-dimensional circuit can be transferred to an
- planar or shallow three- dimensional circuit boards can be efficiently produced using the process. Also, with some process modification, a series of molded plastic chip carriers can be tooled
- plastic chip carriers utilize a pre- molded thermoplastic substrate and a transfer process to apply the conductors, which are subsequently plated, to accomodate wire bonding and soldering operations.
- These chip carriers are manufactured from the same resin system that is used in the circuit boards; and when they are used together, there is no thermal mismatch between the chip carrier and the circuit board.
- An automotive use includes molding a circuitry to the inside roof portion of an automobile having dome light circuitry.
- Example 1 The following ingredients in percent by weight are blended together at room temperature:
- the phenoxy resin is dissolved in diethylene glycol monobutyl ether acetate with agitation.
- the epoxy resin is added to this mixture while agitation is continued.
- silver powder is added to the mixture under continued agitation until it is dispersed to a Hegman grind of six.
- the silver flake is added until it is also dispersed to a grind of six or better.
- the viscosity of the mixture is 35,000 cps as determined with a Brooksfield RVT Viscometer at 24°C using a number six spindle at 20rpm.
- the 2.5/20rpm viscosity ratio is 4.
- the conductive metal and binder are mixed together until completely homogenized to form an ink. This conductive ink is screen printed (U.S.
- VNS Supermat release paper obtained from S.D. Warren Co., Westbrook, Maine
- the printed paper is dried in a forced convection oven at 96°C for ten minutes.
- the polyhydroxyether or phenoxy resin is dissolved in the diethylene glycol monobutyl ether acetate using high speed mixing until all the resin particles are dissolved.
- the melamine formaldehyde resin is then added.
- the nigrosine black and benzoic acid are mixed together and then added with high shear agitation.
- the high surface area silica is then added with high shear mixing.
- the entrained air is removed with vacuum.
- the viscosity of the adhesive composition measured with an RVT Viscometer at 24°C using a number six spindle at 20 rpm is 35,000 cps with a 2.5/20rpm viscosity ratio of 4.
- the prepared adhesive is screen printed in registration on top of the conductor surface of the printed circuit which is already dried. Then, the adhesive coated circuit is placed in a forced convection oven at 96°C for 10 minutes until the adhesive coat is dry but not fully cured.
- a substrate is molded from a composition containing 78 weight percent of a polymer containing the following unit:
- the composi ⁇ tion also contains 12 weight percent mica and 10 weight percent of chopped glass fibers obtained from Owens Corning.
- the substrate composition is injection molded using conventional conditions.
- a 6 in. x 6 in. plaque which is 0.06 in. thick is molded.
- the melt temperature is 377°C
- the mold temperature is 151°C.
- the injection speed is 35mm/sec
- the injection molding pressure is 100 bars for 7 sec.
- the substrate sheet is vapor polished with methylene chloride for about one second.
- the substrate is placed in a compression platen press as shown in Figures 3 and 5 with the release paper containing the conductor (1.0-1.2 mils dry film thickness) and the adhesive printed in the registration (0.6-0.8 mils dry film thickness). Then it is molded at 600 psi for 3 minutes at 177°C after the release paper is stripped away.
- the circuit board is then cured in an oven at 150°C for 30 minutes. After cure, the board can be soldered with a hand soldering iron or in a wave solder machine set at 246°C with a carrier speed of 6 ft/min.
- the electrical resistance of a square serpentine pattern was measured with a milliohm meter. Consistent values in the range of 5-10 milliohms/mil square are obtained.
- Example 1 is repeated except that both sides of the circuit board are laminated with a printed circuit.
- Example 3 Example 1 is repeated except that the surface of the circuit board upon which circuitry is applied is three dimensional.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US34374689A | 1989-04-27 | 1989-04-27 | |
US343,746 | 1989-04-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990012668A1 true WO1990012668A1 (en) | 1990-11-01 |
Family
ID=23347469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/002139 WO1990012668A1 (en) | 1989-04-27 | 1990-04-17 | Apparatus and method for fabricating printed circuit boards |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0424505A1 (en) |
JP (1) | JPH03506003A (en) |
CA (1) | CA2031488A1 (en) |
WO (1) | WO1990012668A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5879502A (en) * | 1994-05-27 | 1999-03-09 | Gustafson; Ake | Method for making an electronic module and electronic module obtained according to the method |
EP1334820A3 (en) * | 2002-02-07 | 2005-04-13 | W.C. Heraeus GmbH | Punch for a laminating press and use |
WO2007009510A1 (en) * | 2005-07-21 | 2007-01-25 | Hirschmann Car Communication Gmbh | Method for applying electrical conductor patterns to a target component of plastic |
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US4564408A (en) * | 1983-05-25 | 1986-01-14 | Saint-Gobain Vitrage | Process and device for covering a lens preform with a protective sheet |
US4594311A (en) * | 1984-10-29 | 1986-06-10 | Kollmorgen Technologies Corporation | Process for the photoselective metallization on non-conductive plastic base materials |
US4702787A (en) * | 1983-06-10 | 1987-10-27 | Agrifim Irrigation International Nv | Process for making drip irrigation lines |
-
1990
- 1990-04-17 JP JP50749390A patent/JPH03506003A/en active Pending
- 1990-04-17 WO PCT/US1990/002139 patent/WO1990012668A1/en not_active Application Discontinuation
- 1990-04-17 EP EP19900907535 patent/EP0424505A1/en not_active Withdrawn
- 1990-04-17 CA CA 2031488 patent/CA2031488A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1806861A (en) * | 1931-05-26 | Apparatus for making composite glass | ||
US2519661A (en) * | 1948-02-14 | 1950-08-22 | Onondaga Pottery Company | Apparatus for fixing transfers |
US3783073A (en) * | 1971-05-19 | 1974-01-01 | A Warnberg | Method for transferring indicia to fabrics |
US3940534A (en) * | 1973-11-07 | 1976-02-24 | G. T. Schjeldahl Company | Electrical laminate |
US4110139A (en) * | 1974-03-13 | 1978-08-29 | Nco Works Ltd. | Process for preparing bands or belts, particularly suitable for use as watch bands |
US4564408A (en) * | 1983-05-25 | 1986-01-14 | Saint-Gobain Vitrage | Process and device for covering a lens preform with a protective sheet |
US4702787A (en) * | 1983-06-10 | 1987-10-27 | Agrifim Irrigation International Nv | Process for making drip irrigation lines |
US4594311A (en) * | 1984-10-29 | 1986-06-10 | Kollmorgen Technologies Corporation | Process for the photoselective metallization on non-conductive plastic base materials |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5879502A (en) * | 1994-05-27 | 1999-03-09 | Gustafson; Ake | Method for making an electronic module and electronic module obtained according to the method |
EP1334820A3 (en) * | 2002-02-07 | 2005-04-13 | W.C. Heraeus GmbH | Punch for a laminating press and use |
WO2007009510A1 (en) * | 2005-07-21 | 2007-01-25 | Hirschmann Car Communication Gmbh | Method for applying electrical conductor patterns to a target component of plastic |
Also Published As
Publication number | Publication date |
---|---|
EP0424505A1 (en) | 1991-05-02 |
JPH03506003A (en) | 1991-12-26 |
CA2031488A1 (en) | 1990-10-28 |
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