Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1994-12-21
1996-08-20
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1562739, 156324, 29848, B32B 3120, B32B 3104, B32B 1508, H05K 300
Patent
active
055475353
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns the processes for producing plastic laminates using metal laminae.
Plastic laminates usually consist of sheets formed of a number of layers of plastic materials stably associated, generally by pressing, on supports of paper, fabrics, fibreglass or other materials.
The plastic materials used may be of phenol, melamine, epoxy, polyester, silicon, fluoride or others.
To make printed circuits a metal lamina, especially one of copper, is glued onto one or both of their sides during the pressing process.
A pile is formed of packages all Virtually the same, each one comprising a certain number of sheets impregnated with plastic materials and copper laminae placed one on each side of the package.
A metal sheet, of stainless steel or some other type, is placed between each package, and the pile so formed is put in a multiple-plate press which simultaneously provides heat and pressure.
At the end of each heat cycle, in which a temperature of 190.degree. C. may be reached at pressures of up to 100 kg/cm.sup.2 lasting over 100 minutes including a cooling stage to 70.degree.-80.degree. C., a compact and rigid product is obtained the single components of which are closely associated together.
Bearing in mind the many components needed, their nature and dimensions, formation of packages is a somewhat lengthy and complex process; this raises their cost considerably especially in production of laminates for printed circuits. Clearly the presses needed for this process are complex and of low output because of the many heating plates in them, because of the need to produce simultaneously both heat and pressure, with exact timing of these stages, and the need to create, by conduction, uniform temperatures in the various packages making up the pile of which, obviously, only those at each end of it are in contact with the heating plates.
The presence of many plates in the press not only complicates it structure but lengthens the time required for loading and unloading packages while preparation of short runs is made problematic because relatively more costly.
SUMMARY OF THE INVENTION
Subject of the invention is a process for production of plastic laminates, aimed at simplifying and speeding up formation of packages, to enable use to be made of more compact and simpler presses and to facilitate transmission of calories during the heating stage and of refrigerating units during cooling.
The package or packages in the pile are made from a multicomponent band fed in continuously and simultaneously with bands of supporting material impregnated with plastic material and with one, or two, external metal bands of copper or some other suitable material.
One end of the multicomponent band is laid on a flat surface of the machine and, after a metal sheet has been put on top of it, said band is folded at 180.degree. and matched onto the second face of said sheet then, after another metal sheet has been placed on said band, a second fold at 180.degree. is made in the direction opposite to the first fold and matched up with the second face of the second sheet, then after a third metal sheet has been placed, yet another fold is made at 180.degree. in the direction opposite to the second fold, and so on according to the number of packages it is desired to form.
Each length of said multicomponent band lying between one sheet of metal and another therefore forms a package with all the components of said package in their usual order. At the end of the process the laminates obtained can of course be separated by cutting the multicomponent band between one package and another.
Advantageously the heat is supplied by connecting two ends of the metal bands at the beginning and end of the package or pile of packages to a suitably high-powered generator of electricity.
In this way said bands act as electric resistances. Said heating system can naturally be associated to the usual method of heating packages by means of heating plates or in some other way. In this case the packages are heated more qui
Ball Michael W.
Cedal S.r.l.
Striker Michael J.
Yao Sam Chuan
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