Coating processes – With post-treatment of coating or coating material – Solid treating member or material contacts coating
Patent
1986-02-06
1987-08-18
Lusignan, Michael R.
Coating processes
With post-treatment of coating or coating material
Solid treating member or material contacts coating
118 44, 118 60, 118325, 118415, 118641, 118642, B05D 312, B05C 1100, B05C 302, B05B 1302
Patent
active
046876855
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL DOMAIN
The invention is concerned with a process for impregnating with synthetic resin a planar, compressible carrier material, whose air permeability according to Gurley is more than 1.0 s, to produce a stackable product, in particular a so-called "prepreg". Such carrier materials are, e.g., papers used for the manufacture of synthetic resin-laminated sheets. The air permeability of such papers as determined according to Gurley is generally between 10 and 20 s, though for some special papers values between 1 and 5 s, and even values above 20 s have been measured.
The invention is furthermore concerned with a device for working the process according to the invention.
STATE OF THE ART
In a generally customary process of the aforementioned type, a continuous web or carrier material, e.g., a paper web, passes through an impregnating vat situated in an impregnating station, which contains a synthetic resin solution of low viscosity, which completely saturates the paper web during its passage. The paper web then passes through a pair of doctor rollers and subsequently through a drying tunnel, in which the solvent of the synthetic resin solution absorbed by the paper is to a large extent steamed off in a hot air current and is removed with the exhaust air of the installation.
The paper web impregnated with synthetic resin in this manner is, after leaving teh drying tunnel usually separated into single sheets which are also called "prepregs". Synthetic resin-laminated plastic panels can then by manufactured from such prepregs, e.g., by laminating the prepregs into parcels and hot-pressing these parcels at high pressure in the known manner. This known method has the advantage that the resin coating of the paper web can be relatively simply and precisely dosed in the doctor rollers by adjusting the concentration of the synthetic resin solution and by squeezing out the excess resin solution. However, it has the disadvantage of relatively high energy consumption, primarily due to the production of hot air required for the drying process. This energy need is increased further, when --in order to prevent strain on the environment --the exhaust air removed from the installation, which in addition to water vapor also comprises volatile low-molecular resin components and possibly also organic solvent vapors, must be cleansed by burning.
DESCRIPTION OF THE INVENTION
The invention has the primary objective to disclose a process for impregnating a planar compressible carrier material with synthetic resin to produce a stackable product, where the carrier material --similar to the papers customarily used in the manufacture of laminated plastic panels --has an air permeability with values higher than 1.0 s according to Gurley, and with this method permitting similarly precise dosing as the aforesaid known method, it manages to do this with a considerably lower consumption of energy.
This problem is solved in the process according to the invention, wherein initially a liquid synthetic resin coating with a synthetic resin content of 70 to 100.degree. is applied to one surface of the carrier material, whereby the synthetic resin coating, which is raised to a higher temperature before and/or after such application, at least partially penetrates into the carrier material, and wherein the carrier material to which synthetic resin has thusly been applied is thereupon subjected to such mechanical pressure that the synthetic resin possibly still present as a surface coating penetrates into the carrier material, and wherein the synthetic resin evenly permeates the carrier material, with the pore volume of the carrier material being advantageously reduced under the pressure action to such an extent that the amount of synthetic resin applied is sufficient to at least almost completely permeate the pore volume of the carrier material.
According to advantageous embodiments of the invention, the process according to the invention is characterized by that mechanical pressure is applied only after most or all of the synthetic r
REFERENCES:
patent: 4174243 (1979-11-01), Magarian
patent: 4208230 (1980-06-01), Magarian
patent: 4407867 (1983-10-01), Bruck et al.
patent: 4477495 (1984-10-01), Ring et al.
Isovolta Oesterreichische Isolierstoffwerke Aktiengesellschaft
Lusignan Michael R.
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