DK147323B - PROCEDURE FOR MANUFACTURING A SHEET OR SHAPE FIBER MATERIAL - Google Patents

Description

147323

It has been proposed to produce a high strength sheet or web-shaped fiber material by means of a gas permeable reinforcing material, a gas stream containing suspended fibers and a binder or binder solution. In this method, the gas stream containing the suspended fibers, preferably cellulose fibers, is passed through the gas-permeable reinforcing material, and here, during the retention of the fibers which are entrained in the reinforcing material. As the intensity of the gas flow, and thus the amount of suspended fibers within a given range, decreases as more fibers are retained by the reinforcing material, this method results in a tendency to form a uniform fiber layer on the reinforcing material. A corresponding fiber layer can then be formed on the opposite side of the reinforcing material. The two layers of fiber form after application of a binder or binder solution and rolling, e.g. between heated rollers, textile fabric-like coatings on the reinforcing material, which is to a great extent the strength-inducing element of the sheet or web-formed material.

The object of the invention is to provide, without the use of an actual reinforcing material, a textile fabric-like sheet or web-shaped fiber material with good strength properties.

To this end, the invention provides a method whereby a stream of a gas containing suspended fibers, mainly cellulose fibers, is passed through a gas-permeable molding surface upon deposition of a fiber layer thereon and the fibers in the fiber layer are applied to a binder or a binder. binder solution.

This method is characterized in that the fiber layer is embossed in a grid-shaped pattern.

The embossing of the fiber layer in said mesh-shaped embossing pattern results in the reinforcing or strengthening skeleton forming in the sheet or web-shaped material itself. The intermediate regions, as a result of being a porous, relatively loosely bonded fiber layer, have a textile-like character. The textile-like character is mainly due to the use of cellulose fibers which, when the fiber layer is made from a suspension of cellulose fibers in air, have a curved and irregular shape, whereby the fibers are strongly entangled in each other, thereby forming a bulky fiber layer where the individual fibers are connected to each other in their mutual contact points by virtue of the binder applied.

A sheet or web-shaped material provided with a suitable mesh-shaped embossing pattern, e.g. corresponding to the pattern in a loosely woven textile fabric, as mentioned, in addition to a substantial tear strength 2 147323 has the appearance of a textile fabric. The larger the embossing area, the better the strength properties of the sheet or web-shaped material, but at the same time its voluminosity is reduced.

However, with an embossing area of less than 50% it is possible to obtain a good tear strength and a textile fabric-like appearance and grip.

By embossing the sheet-shaped material in appropriate patterns, an aesthetically pleasing product can be obtained at the same time, which can be used for purposes which have heretofore been referred to using textile fabrics. The material of the invention can e.g. used for the manufacture of garments, curtains and bed linen.

In practicing the method according to the invention, a wire of the kind used in the manufacture of paper products by the wet method is suitably used. The supply of fibers to the wire is conveniently effected in such a way that a gas stream is produced between a suction box placed under the wire and a device placed over the wire. As the gas stream passes through the wire, the fibers are then intercepted and, as a result of having an irregularly curved shape, form a coherent layer. The fiber layer is then applied to a binder, preferably by spraying.

Alternatively, new fiber layers and binder applications can be applied. The material may also be prepared by co-application of fibers and binder by spraying the fibers during movement from the feed member to the wire with a fine mist of binder or binder solution. The formed sheet or web-shaped material is then subjected to said projection either on or outside the wire. An appropriate way of embossing the material is to pass it between a set of embossing rollers that may be heated. In embossing, the fibers wetted with the binder not yet solidified are pressed together and thereby bonded to each other in said mesh-shaped embossing pattern.

In the event that it is desired to produce a sheet or sheet-shaped material with a particularly high tear strength, a gas-permeable reinforcing material may be used as a molding surface. In embossing this material, the skeleton of bonded fibers will be joined to the reinforcing material.