CZ281682B6 - Layered flat formation and process for producing thereof - Google Patents

Abstract

During the production of flat laminated formation at least one layer of which consists of fabric galvanised on at least one side, first of all the fabric is fixed in the required form, then it is galvanised and the treated fabric is impregnated by a resin or covered with a reinforcement layer.

Description

Method for manufacturing a sheet laminate formation

Technical field

SUMMARY OF THE INVENTION The present invention provides a method for manufacturing a sheet laminate having at least one layer of fabric, at least one side metallized.

BACKGROUND OF THE INVENTION

The best known way to provide a continuous metal layer with a laminate sheet is to provide a metallization coating on its surface. For this purpose, it is advisable to blast the surface, cement it and then sand it. The metallized layer is then coated with a protective coating. However, blasting will damage the integrity of the surface layers and expose air thinners. This reduces the mechanical properties of the surface layers and increases the demands on manual work associated with cementing and grinding. The use of copper-clad materials for PCBs is only possible with planar formations. The incorporation of a continuous metal foil into the inner layer of the laminate formation requires perfect adherence of the metal foil to both sides thereof, which is difficult with manual lamination. Insufficient adhesion of the metal foil separates the individual layers of the laminate sheet. Accordingly, the metal foil is also adhered to the surface of the laminate sheet by organic adhesives, whereby it is then exposed to the immediate effect of weathering, in particular sunlight. Organic adhesives exhibit degrading effects, resulting in the films peeling off. For these reasons, the surface of the laminate is also provided with a galvanically deposited layer of metals, the base layer of which is generally silver and which must be protected with an additional layer of protective lacquer. The effects of climate change and the abrasive effects of exhalations greatly reduce the durability of the thus formed layer. Also known is a laminate sheet having at least one layer of fabric that is metallized on at least one side. In order to satisfy the condition of reflecting the high-frequency waves thus formed by the laminate formation, there must be no breakage of the plating layer at the intersection of the individual fibers of the fabric when handling the metallized fabric. Their conductive connection is a necessary condition for reflection of high-frequency waves. Therefore, only planar laminate formations can be made from a pre-metallised fabric, with the difficulty of maintaining this condition.

SUMMARY OF THE INVENTION

These drawbacks are overcome by a method for manufacturing a sheet laminate formation of which at least one layer is a fabric, at least one metallized, according to the invention. The fabric is first fixed in the desired shape, after which it is metallized and so treated is impregnated with a resin or possibly supplemented with a layer of reinforcement. By metallization, the fabric is fixed in its final shape. It is possible to coat it both outside the lamination form and subsequent storage, as well as directly in the lamination form. The condition is that between metallization and lamination there must be no deformation of the metallized fabric that would break the conductive connections of the individual metallised fibers of the fabric at their intersection points. It is therefore most advantageous if the metallization is carried out directly in the lamination form. This avoids deforestation of the cat-plated fabric, which is perfectly consolidated by lamination, particularly since the fabric is already partially coated by the metallization, thereby causing larger structures to become deformed and consequently break the conductive joints at the fiber crossing points. After curing of the resin, the fibers are already sufficiently connected to each other so that there is no risk of breaking the conductive connection in their crossing. The laminate sheet thus produced perfectly shields and reflects the high-frequency waves.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

The shielding cover wall of the RF source, consisting of a layer of glass fleece, glass fabric and glass fiber mat, has a glass fabric layer treated with a deposited silver layer. The fabric so treated is first formed into the final wall shape of the shielding cover. A layer of 40 μιη thick media is electroplated onto the formed fabric. The fabric is supplemented with a glass web and a glass strand mat, whereupon the treated article is impregnated with a dyed polyester resin.

Example 2

The satellite dish laminate is made of fiberglass, which is first laid out in a laminating form and provided with a 50 μπι metallizing copper coating, followed by a layer of strand mat and impregnating the layers together with polyester resin. The final treatment is carried out with a colored gel.

Example 3

The laminate satellite dish, which consists of a layer of colored gel, glass fabric, steel mesh of 25 mesh per cm ² , strand mats and glass fabric, has a layer of steel mesh, metallized in the desired shape by immersion in a zinc bath. The individual layers are applied to each other in a laminating form and then impregnated together with an epoxy resin.

Claims (2)

A method for producing a sheet laminate having at least one layer of fabric, metallized on at least one side, characterized in that the fabric is first fixed in the desired shape, after which it is metallized and so treated with resin. Method according to claim 1, characterized in that the impregnated fabric is supplemented with reinforcement.