Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-07-24
1997-11-18
Sells, James
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156269, 1562722, 1565831, 100 93P, B32B 3100
Patent
active
056883528
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE
The instant invention is related to that described in copending U.S. patent application Ser. No. 08/331,661, filed Nov. 7, 1994, in which a method of making a plastic laminate with one metal lamina on one side is described and claimed.
BACKGROUND OF THE INVENTION
The invention concerns processes for making plastic laminates with metal laminae, wherein each of the plastic laminates has a metal lamina on each of two opposing side surfaces.
In the normal way plastic laminates consist of several layers, associated with each other generally by pressing, and comprising plastic materials on a base of paper, fiber glass, fabrics or other materials.
The plastic materials may comprising phenol, melamine, epoxy, polyester, silicon, fluoride or others.
In the production of printed circuits a metal lamina, especially of copper, is made to adhere on one or both sides of the circuit during the pressing process.
A stack of substantially similar units is formed, each of which comprises a number of sheets impregnated with plastic materials with the copper laminae placed outermost. A sheet of metal such as stainless steel or some other is placed between each unit and the stack of unit is put in a multiplate press which applies heat and pressure simultaneously.
At the close of the heating cycle, which includes a cooling stage, a compact and rigid product is obtained whose individual components are closely associated together. Presses suitable for this kind of production are complex and give a low output because of having many plates, of having to produce heat and pressure at the same time and in well defined and precise sequences, because of having to create, by conduction, even temperatures in the various units in the stack of which, obviously, only those at the top and bottom of the stack are in contact with the heating plates.
The presence of many heating plates not only complicates the structure of the press but also makes unit loading and unloading a lengthy operation, while problems occur over short production runs because of the difficulties of amortizing costs.
In particular, the penetration of heat from the plates through the stack is hindered because of the distance it must travel to reach the innermost unit or prepreg body. These difficulties result in high costs, for the press itself and for running it, in waste of materials, in long processing times and therefore in a more costly product. The invention here presented greatly lessens the above drawbacks while offering considerable advantages as will be explained below.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved process for making plastic laminates, especially those for printed circuits, with a metal lamina on each of two opposing side surfaces or faces of each laminate by the formation of a stack of prepreg bodies comprising a high-insulation plate, of prepreg or another material, and comprising a plurality of prepreg sheets or layers impregnated with plastic material.
Sheets of stainless steel or other material, hereinafter called flattening sheets are placed between each adjacent pair of prepreg bodies.
The process for makin plastic laminates according to the invention comprises the steps of:
a) stacking the prepreg bodies, one on top of the other, so that each pair of adjacent prepreg bodies has two opposing side surfaces facing each other;
b) passing a first metal band and a second metal band in a serpentine manner back and forth through the resulting stack of prepreg bodies with the first metal band and the second metal band spaced from each other to form a number of bends in both metal bands on opposite sides of the stack;
c) arranging each prepreg body in the stack between the first and second metal band so that the first metal band contacts on one side surface of each prepreg body and the second metal band contacts on the other remaining side surface of each prepreg body; insulating layer covering each of two opposite sides between each pair of adjacent prepreg bodies and, at the same tim
REFERENCES:
patent: 3409942 (1968-11-01), Siempelkamp
patent: 3592993 (1971-07-01), Bennett
patent: 3826601 (1974-07-01), Hutter
patent: 3860381 (1975-01-01), Pesch
patent: 3969117 (1976-07-01), Doran et al.
Cedal S.r.l.
Sells James
Striker Michael J.
LandOfFree
Process for making of plastic laminates each having a metal lami does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for making of plastic laminates each having a metal lami, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making of plastic laminates each having a metal lami will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1562661