DE1940524U - SIDE CRACK-INSENSITIVE GLASS FIBER SHEET MADE OF REGULARLY ARRANGED GLASS FIBERS WITH BINDERS, WITH GLASS FIBERS WELDED ON ONE OR BOTH SIDES AT THE EDGE. - Google Patents

Description

My files: 2038 Gbra

Applicant; Reichhold Chemie Aktiengesellschaft Hamburg-Wandsbek, Iversstrasse 57

Fiberglass sheet, insensitive to side cracks, made of randomly arranged Glass fibers held together with binding agents with glass fibers welded on one or both sides at the edge

The present innovation relates to a side crack insensitive Glass fiber web with randomly arranged glass fibers held together with binders »

In the continuous production of flat webs from randomly arranged individual glass fibers of different types Length glued together with synthetic resin binders or natural binders such as starch are cut, the irregular edges caused by the manufacturing process are cut to create consistent To achieve widths. These cut edges tend to be exposed to mechanical stress during further handling to tear and thus to a reduction in the strength in the longitudinal direction of the webs on the torn Job.

Numerous measures and proposals are already known to reduce this susceptibility to tearing to diminish this path from the side. For example, threads, yarns and twines are made from the most diverse Raw materials such as glass, cotton, synthetic fibers and the like in or on the glass thread, which form the flat path, one example in the longitudinal direction. upset.

During the production process these threads, yarns, Twists and the like are connected to the flat web by the binding agent »The threads are either identically

—2 -

moderately over the entire width deü? Distributed or

but f are individually or in groups on the edge

the web close to the cut edge.

'* It is also known, the flat glass fiber webs

with threads, yarns or twines of various raw materials

* rialieh, to be sewn or closed at regular intervals

quilt. It is also known to place the flat glass fiber webs on a solid, suitable carrier material such as paper, fabric, knitted fabric and to connect the two different webs together, for example by gluing, sewing or quilting. Combinations of the processes mentioned for improvement

: tion of the susceptibility to cracking of the fiberglass webs against forces,

who attack from the side are known. It is also common that by direct exposure to high temperatures by means of glass flames the glass fibers can be heated above the melting point of the glass to fuse these together. However, this method has the major disadvantage that the known high strength of the glass fibers is greatly reduced by the melting.

The innovation is based on the task of a fiberglass web to create the production technology with the simplest Agent leads to a product that is in the marginal zone mechanical properties are fully preserved and no longer sensitive to side cracks for practical needs is. This object is achieved in that in the one or both-sided edge zone of the glass fiber web at least the glass fibers arranged on the surface in sufficient numbers at their points of contact Glass-to-glass welds are connected and welded Glass fibers still have sufficient strength. Under in sufficient numbers by glass-to-glass welding Connected glass fibers should be at least 10 $ of those arranged in the treated edge zone Optical fibers are understood.

The later, improved lateral rifle insensitivity In this direction, fiberglass webs have considerable advantages over the known fiberglass webs and

can be produced extremely easily »To prevent the loss of strength of the glass fibers during melting, metal rolls of the width are used to treat the edge of the glass fiber web, which should have the desired solidified edge zone of the glass fiber web, and these rolls are heated to a temperature in which the glass fibers guided through the rim of the glass cloth soften enough but not scshiaelüson. , o that they adhere firmly to one another after leaving the roller. Folds made of precious metal are particularly suitable for this purpose, but other metals can also be used without any disadvantageous effect. These rollers can be heated by direct heating, but especially by heated air or by electrical resistance heating. Because the rollers are kept at a constant temperature below the melting point of the glass to be processed, a decrease in the strength of the glass fibers due to heating above their melting point is avoided. The execution of the process is supported by the pressure of the rollers on the edge of the fiberglass web. The described method and the new arrangement can be subjected to fiberglass webs with a thickness of 0.2 to 1.5 mm. Preferably, however, a thickness of the glass cloth of 0.3 to 0.8 mm, preferably used are those glasses for the production of the glass cloth whose transformation temperature is between 300 to 700 ⁰ C. Particularly preferred glasses have transformation temperatures of 400 to 600 ^° C.

The web according to the innovation and some exemplary manufacturing processes are illustrated by the accompanying drawings.

Figure 1 shows a fiberglass web 1, the one-sided in the Edge zone welded glass-to-glass at the points of contact Represents optical fibers bearing the number 5.

Figure 2 shows a fiberglass web, which is particularly in the The edge zone shows the layer in which the touching glass fibers are carbonized. The edge zone carries "in: all figures the Nurr.mer 6. ■ _ /

Figure 3 illustrates the production of the new equipment Glass fiber web, the glass fiber web 1 through two metal cylinders, designed as rollers 2 carried out is, which are heated by hot air 3 to a temperature that this the glass of the fiberglass web in just softens the coated area. In this device shown press the cylindrical, heated metal rollers continuously on the fiberglass sheet, with the glass of the fiberglass barely there is heated to the extent that the pressure allows them to adhere to one another at the points of contact.

The edge zone in which this special glass-to-glass welding is carried out is about 1/30 to 1/10 of the total width; however, 1/20 that is preferred Total width to be welded on both sides of the web.

In a further embodiment of the innovation according to the invention Fiberglass webs can also have additional zones, preferably in the form of a strip, on the area between the edge zones Arrangement, in the longitudinal and / or transverse direction of the fiberglass web, in which at least those on the surface arranged glass fibers in the further zone bz ^ tf. Zones are connected by glass-to-glass welding, be arranged. These strip-shaped welding points arranged in the longitudinal and / or transverse direction permit to separate the neuungsgeraäß glass fiber web after production into such one-piece pieces that the newly formed edges are also present in the form that is not susceptible to lateral cracks according to the innovation.

This further embodiment of the glass fiber web according to the innovation can be produced in the manner already described. There are only more heated Meta11 roller pairs required that the required temperature and pressure treatment in the longitudinal and / or transverse direction the fiberglass run.

Figure 4 shows the further embodiment ^ form the renewal according glass fiber web I _9, except of the edge zone 3, further arranged in the longitudinal direction of the web zones ^ ₃ where disposed on the surface of glass fibers are connected to glass-to-glass weld has.

However, Figure 5 shows a further embodiment _s of FIG i \ with the difference that the form of strips arranged superficial glass-glass welding at-are also arranged in the transverse direction of the glass fiber web.

The shown fiberglass webs consist of such glass fibers that have different lengths, for example between 20 and 300 ^cm

Claims (3)

ΡΑ.2ΊΒ 201 * 11.5.66 File number: R 32 O5O / 8h Gbm Applicant: Reichhold Chemie Aktiengesellschaft My files: 2038 Gbm New claims for protection 1.) Glass fiber web, insensitive to side cracks, made of randomly arranged fibers held together with binders Glass fibers, characterized in that in the one or both-sided edge zone of the glass fiber web at least the glass fibers arranged on the surface in sufficient numbers at their points of contact are arranged connected by glass-to-glass welding and the welded glass fibers still have sufficient mechanical strength. 2.) Glass fiber web according to claim 1, characterized in that at least 10% of the in the treated edge zone arranged glass fibers are connected by glass-to-glass welding. 3.) Glass fiber web according to claim 1 or 2, characterized in that at least one edge zone improved Has strength properties obtained by treatment with hot metal rollers at a temperature at which the glass fibers have been sufficiently softened without melting, treated under the pressure of the rollers is. 4 ·.) Glass fiber web according to one or more of the preceding Claims, characterized in that further zones, preferably in a strip-like arrangement, in the longitudinal and / or transverse direction of the glass fiber web, arranged with glass fibers present in a glass-to-glass weld are. ^ u "g- ¹ y i-'rei a ·· je-θ'.δπ /.s: ■" Au ''-.;'.- ■ rr' ·. · .; «Ί · η μ" '.' Art ftefin D '' ° 'e-f