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Products Processes Materials Equipment

Products Processes Materials Equipment Microthin Copper Clad Laminate Etch-Resist Transfer Symbols The ever increasing requirement for miniaturisation, both in The new Seno etch-resist transfer symbols from Decon Laborat­ industrial and consumer electronic equipment, can now be met with ories are designed to improve the appearance and quality of more confidence with a new printed circuit laminate recently prototype pcb's. Presented as very convenient-to-use strips of developed by Formica Limited. symbols, the transfers offer very sharp definition and excellent Following intensive research and proving trials, the company has resistance to ferric chloride and other common etchants. firmly established their Microthin Copper Clad CFG 83C, glass The transfers themselves are backed by an adhesive designed for epoxy base laminate clad with only 5 microns of copper, for use in the maximum adhesion to copper surfaces, and are very easy to use. The manufacture of both ultra-fine line circuits and plated-up circuitry pack comprises 10 strips of different symbols: four sizes of roundel, which calls for the highest possible definition. However, as a design two sizes of 8- and 10-pin valve and relay base pin patterns, two of bonus this new material is also ideally suited for less sophisticated d.i.l. strips, one for transistors and one of contact pads. circuitry design, where the manufacturer will make considerable cost- The Seno transfers have been designed to compliment the well savings through a reduction in processing time. Based on extensive known Decon-Dale etch-resist marking pen, and the two used trials this reduction can be as much as 75% for etching and together provide probably the finest way of preparing a one-off reclamation when compared with the standard 35 micron clad board or a limited run. material with a 50% reduction for etchant/plating solution Decon Laboratories Limited, reclamation in a standard PTH process. On the mechanical side, Ellen Street, further cost savings are made as hole burr is considerably reduced Portslade, during the drilling process. Brighton, Whilst standard existing processes and equipment can still be Sussex BN4 1EQ. used, the technical advantages in design are quite considerable. Apart from using less etchant over a shorter time, the most important In-Line Lead Cutter factor is that the conductor track undercut is negligible which Electrovert announce the introduction of their Electrotrim Lead permits the design of more densely packed circuits using 0.005 in lines and spaces. Furthermore, the pcb rejection rate is greatly Cutter Model 5. This is a free-standing system capable of being reduced due to higher precision with improved definition. operated independently or interfaced with a wavesoldering system for a fully automated in-line pcb production operation. It is designed Formica Limited, to meet cutting accuracies of commercial and military specifications, Coast Road, and conform to applicable OSHA safety requirements. The standard North Shields, system is designed for pallet operation. Tyne and Wear NE29 8RE. The equipment incorporates several significant features to insure uniform cutting and prevent damage to board, joints and com­ ponents. Its conveyor system, though connected to one drive, is Inspection of Plated-Through Holes divided into three sections: loading, cutting and unloading. It also incorporates a reverse gear. With the cost of quality control techniques both in time and The loading and unloading sections have separate conveyor belts finance, soaring day by day, any development that improves adjustable to + 15° from the horizontal to provide the proper angle efficiency and at the same time makes a saving in capital expenditure, and means for interfacing smoothly with other conveyorised must obviously be welcomed by industry. In the electronics and operations. A system of guide slots in the cutting section provide the allied industries where circuit design is becoming increasingly more necessary critical guidance for fixed, horizontal alignment of the pcb complex, inspection for quality control is extremely critical and it with the cutter blades. As a result, close tolerance cutting can be follows that efficient and fast inspection at the earliest possible stage achieved, as close as 0.12in from the underside of the board, and of production is essential. accurately duplicated throughout an entire production run. Formica Limited, one of the largest producers of laminate in The cutter rings are precision ground, solid tungsten-carbide and Europe, has recently developed a new grade of industrial laminate for cut by slicing the leads with a smooth, sharp edge. There are no teeth printed circuit applications that enables fast inspection for plated- or serrations to transmit vibration and shock to the components or through holes and will ensure one hundred percent reliability, prior joints. Depending on the conveyor width, the number of cutter rings to circuit assembly. Called CFG 83FL, the copper-clad laminate is vary from 4 for a 12 in (300 mm) system to 6 for an 18 in (450 mm) based on standard FR4 epoxide glass, the new grade has a system. Each cutter ring can be independently controlled for vertical fluorescent dye incorporated in the resin that will fluoresce when adjustment and power. Rotation is 3450 rpm nominal at 60 Hz . An exposed to a suitable ultra-violet light source. After the metallisation rpm sensor will immediately shut down the system in the event of a process of plated through holes it is essential that the layer of metal is slow-down or malfunction. Automatic sequential starting is used to complete, in which case, no fluorescence will be visible. If, however, decrease line in-rush. pin holes, cracks or other imperfections are present after electroless With the use of multiple cutting rings, 1,000,000 or more copper plating, these areas will fluoresce and be easily detected by the naked leads can be trimmed between sharpenings and each ring re- eye, when the circuit board is examined in an ultra-violet viewing sharpened as many as 30 to 40 times. Kovar and steel leads can also cabinet. be trimmed. Unlike many systems currently in use, this method is non­ The cutting zone is enclosed in a clear acrylic housing for complete destructive and may be employed as an in-process quality control visibility and safety. The acrylic housing is electrically interlocked. system for any production line in consumer or industrial electronics Trimmed excesses of the leads are automatically removed and involving printed circuits. Furthermore, it eliminates the costly collected for disposal. process of retrieving components from pcb's after a number of assembly operations. Th e incorporation of the fluorescent dye in this Electrovert Limited, laminate does not affect the electrical or mechanical properties nor is PO Box 1200, Montreal, the dye adversely affected when the laminate comes into contact with Canada. the various solutions used in everyday electroplating processes. A suitable UV viewing unit can either be easily assembled by the process printer, or a standard viewing cabinet may be obtained from Carbide Drill for Multilayer Pcb's manufacturers of such equipment. If required, a basic design for UV A new solid tungsten carbide drill featuring a small contact area viewing cabinet is available on request from Formica Limited. and a hyperbolic transition from flute to shank has been introduced Formica Limited, by Welwyn Tool Co. Limited. Designed to run at high speeds and Coast Road, feed rates, th e drill, known as the Hawera-Multi, is intended for high North Shields, production of clean, smear-free holes in multilayer pcb's and is also Tyne and Wear NE29 8RE. suitable for drilling plated-through holes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Circuit World Emerald Publishing

Products Processes Materials Equipment

Circuit World , Volume 2 (4): 1 – Mar 1, 1976

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0305-6120
DOI
10.1108/eb043541
Publisher site
See Article on Publisher Site

Abstract

Microthin Copper Clad Laminate Etch-Resist Transfer Symbols The ever increasing requirement for miniaturisation, both in The new Seno etch-resist transfer symbols from Decon Laborat­ industrial and consumer electronic equipment, can now be met with ories are designed to improve the appearance and quality of more confidence with a new printed circuit laminate recently prototype pcb's. Presented as very convenient-to-use strips of developed by Formica Limited. symbols, the transfers offer very sharp definition and excellent Following intensive research and proving trials, the company has resistance to ferric chloride and other common etchants. firmly established their Microthin Copper Clad CFG 83C, glass The transfers themselves are backed by an adhesive designed for epoxy base laminate clad with only 5 microns of copper, for use in the maximum adhesion to copper surfaces, and are very easy to use. The manufacture of both ultra-fine line circuits and plated-up circuitry pack comprises 10 strips of different symbols: four sizes of roundel, which calls for the highest possible definition. However, as a design two sizes of 8- and 10-pin valve and relay base pin patterns, two of bonus this new material is also ideally suited for less sophisticated d.i.l. strips, one for transistors and one of contact pads. circuitry design, where the manufacturer will make considerable cost- The Seno transfers have been designed to compliment the well savings through a reduction in processing time. Based on extensive known Decon-Dale etch-resist marking pen, and the two used trials this reduction can be as much as 75% for etching and together provide probably the finest way of preparing a one-off reclamation when compared with the standard 35 micron clad board or a limited run. material with a 50% reduction for etchant/plating solution Decon Laboratories Limited, reclamation in a standard PTH process. On the mechanical side, Ellen Street, further cost savings are made as hole burr is considerably reduced Portslade, during the drilling process. Brighton, Whilst standard existing processes and equipment can still be Sussex BN4 1EQ. used, the technical advantages in design are quite considerable. Apart from using less etchant over a shorter time, the most important In-Line Lead Cutter factor is that the conductor track undercut is negligible which Electrovert announce the introduction of their Electrotrim Lead permits the design of more densely packed circuits using 0.005 in lines and spaces. Furthermore, the pcb rejection rate is greatly Cutter Model 5. This is a free-standing system capable of being reduced due to higher precision with improved definition. operated independently or interfaced with a wavesoldering system for a fully automated in-line pcb production operation. It is designed Formica Limited, to meet cutting accuracies of commercial and military specifications, Coast Road, and conform to applicable OSHA safety requirements. The standard North Shields, system is designed for pallet operation. Tyne and Wear NE29 8RE. The equipment incorporates several significant features to insure uniform cutting and prevent damage to board, joints and com­ ponents. Its conveyor system, though connected to one drive, is Inspection of Plated-Through Holes divided into three sections: loading, cutting and unloading. It also incorporates a reverse gear. With the cost of quality control techniques both in time and The loading and unloading sections have separate conveyor belts finance, soaring day by day, any development that improves adjustable to + 15° from the horizontal to provide the proper angle efficiency and at the same time makes a saving in capital expenditure, and means for interfacing smoothly with other conveyorised must obviously be welcomed by industry. In the electronics and operations. A system of guide slots in the cutting section provide the allied industries where circuit design is becoming increasingly more necessary critical guidance for fixed, horizontal alignment of the pcb complex, inspection for quality control is extremely critical and it with the cutter blades. As a result, close tolerance cutting can be follows that efficient and fast inspection at the earliest possible stage achieved, as close as 0.12in from the underside of the board, and of production is essential. accurately duplicated throughout an entire production run. Formica Limited, one of the largest producers of laminate in The cutter rings are precision ground, solid tungsten-carbide and Europe, has recently developed a new grade of industrial laminate for cut by slicing the leads with a smooth, sharp edge. There are no teeth printed circuit applications that enables fast inspection for plated- or serrations to transmit vibration and shock to the components or through holes and will ensure one hundred percent reliability, prior joints. Depending on the conveyor width, the number of cutter rings to circuit assembly. Called CFG 83FL, the copper-clad laminate is vary from 4 for a 12 in (300 mm) system to 6 for an 18 in (450 mm) based on standard FR4 epoxide glass, the new grade has a system. Each cutter ring can be independently controlled for vertical fluorescent dye incorporated in the resin that will fluoresce when adjustment and power. Rotation is 3450 rpm nominal at 60 Hz . An exposed to a suitable ultra-violet light source. After the metallisation rpm sensor will immediately shut down the system in the event of a process of plated through holes it is essential that the layer of metal is slow-down or malfunction. Automatic sequential starting is used to complete, in which case, no fluorescence will be visible. If, however, decrease line in-rush. pin holes, cracks or other imperfections are present after electroless With the use of multiple cutting rings, 1,000,000 or more copper plating, these areas will fluoresce and be easily detected by the naked leads can be trimmed between sharpenings and each ring re- eye, when the circuit board is examined in an ultra-violet viewing sharpened as many as 30 to 40 times. Kovar and steel leads can also cabinet. be trimmed. Unlike many systems currently in use, this method is non­ The cutting zone is enclosed in a clear acrylic housing for complete destructive and may be employed as an in-process quality control visibility and safety. The acrylic housing is electrically interlocked. system for any production line in consumer or industrial electronics Trimmed excesses of the leads are automatically removed and involving printed circuits. Furthermore, it eliminates the costly collected for disposal. process of retrieving components from pcb's after a number of assembly operations. Th e incorporation of the fluorescent dye in this Electrovert Limited, laminate does not affect the electrical or mechanical properties nor is PO Box 1200, Montreal, the dye adversely affected when the laminate comes into contact with Canada. the various solutions used in everyday electroplating processes. A suitable UV viewing unit can either be easily assembled by the process printer, or a standard viewing cabinet may be obtained from Carbide Drill for Multilayer Pcb's manufacturers of such equipment. If required, a basic design for UV A new solid tungsten carbide drill featuring a small contact area viewing cabinet is available on request from Formica Limited. and a hyperbolic transition from flute to shank has been introduced Formica Limited, by Welwyn Tool Co. Limited. Designed to run at high speeds and Coast Road, feed rates, th e drill, known as the Hawera-Multi, is intended for high North Shields, production of clean, smear-free holes in multilayer pcb's and is also Tyne and Wear NE29 8RE. suitable for drilling plated-through holes.

Journal

Circuit WorldEmerald Publishing

Published: Mar 1, 1976

There are no references for this article.