FI60730B - BITUMEN PAPER OCH FOERFARANDE FOER DESS FRAMSTAELLNING - Google Patents

Description

60730

Bitumen cream and the method of its persecution stand sex. - Bitumen paperboard and wood for cardboard production.

The invention relates to a bitumen cream, the support layer of which comprises a non-fibrous mat or felt made of organic or inorganic fibrous material, to which a second layer of fibrous material is adhered, the support layer being impregnated and coated with bitumen sprinkled with a weather-resistant or anti-adhesive coating.

The invention therefore relates to a bituminous cream supplied in rolls, which is intended for use in 1- or multilayer water coatings either as a surface cream or also as a base and intermediate cream, depending on the quality of the surface spray used.

Several different combinations of bitumen creams with a double support layer are already known. Well-known are e.g. a bitumen cream comprising a metal foil and a non-fibrous material (DE 2827136), a bitumen cream comprising two glass fiber mats (French Pat. Publication No. 1259,631, Finnish Pat. Publication No. 46837). On the other hand, support layers are known which in themselves consist of a glass fiber mat and a mesh fabric, which, however, are laminated together with an organic binder, whereby the glass fiber mat and the mesh fabric form a single support layer.

Important properties to be applied to bitumen creams are tensile strength, elongation, tear strength, rollability, stiffness and nail resistance. Tensile strength, tensile strength and tear strength are technically, obvious mechanical properties that are not worth commenting on. Rollability of bitumen cream is required in order to be able to be rolled up and reopened without breaking the cream. On the other hand, the rigidity of the cream is required to make the product easy to handle and to prevent the slightest irregularities in the surface of the substrate from being visible on the surface of the cream applied to the roof. Bitumen cream n no. however, it should be too rigid so as not to make rolling difficult. Nailability means that the bitumen cream must be strong enough for the cream to be attached to the substrate even by nailing.

With a standard single-layer glass felt support

Bituminous cream has sufficient tensile and rolling properties. In addition, the polyester support layer, among other things, provides good stretch, tear strength and nailability properties. Stiffness, on the other hand, does not. not satisfactory. The glass with the Lasi.huopa support layer has poor elongation, tear strength, stiffness and nail resistance.

Products with two layers of support can achieve the above-mentioned features. For example, a product comprising a metal foil has the above-mentioned properties, but due to its high price, it is mainly used for special purposes. A double layer of glass felt support can substantially improve the tear strength, stiffness and nailability of the product. In this case, however, rollability suffers. When the product is rolled so that the cream sprinkling side faces the center of the roll, the support layer felt closer to the sprinkling surface tends to squeeze into the pile and the support layer felt further away tends to stretch. As a result, bumps, wrinkles and cracks form in the finished product. One solution to this is to roll the product onto large rolls. However, this makes the product more difficult to handle, and increases storage and transportation costs.

Another possibility to prevent the formation of cracks and bumps is disclosed in U.S. Pat. No. 4,837. such as tensile strength, elongation and tear strength. When using support layers with, for example, glass felt and fiberglass mesh laminated together, good mechanical properties as well as good rollability and nailability are achieved. However, the stiffness of the product is only in the same range as that of bitumen cream made from a layer of glass felt support alone.

The above required properties are achieved by a product according to the invention, characterized in that said second layer 3 60730 is a mesh fabric which is glued to the nonwoven with bitumen during the manufacturing process of the felt so that a thin layer of bitumen mass remains between the nonwoven and the mesh. Ko. bitumen.The cream combines good mechanical properties, good rollability, stiffness and nailability, as the test runs performed have shown. In the product according to the invention, the bitumen-bearing support layer fiber or felt can be anything inorganic or. organic fiber, preferably, however, glass felt 2 (e.g. 50 g / m 2). The mesh fabric may preferably be a fiberglass mesh having a mesh size of e.g. 2 to 10 mm or a polyester mesh (mesh size 2 to 20 mm, preferably 5 to 15 mm). In the latter case, the elongation of the product also increases considerably. When the properties of the final products are sufficient, the choice of the support layer is determined by their price. The thickness of the bituminous mass layer between the nonwoven or felt and the mesh fabric is preferably 0.2 to 1.0 mm depending on the desired properties of the cream, mainly the desired stiffness. The mesh fabric can be placed in the cream on the inner or outer side of the roll relative to the second support layer, whereby the mesh as a flexible fabric is able to compress and on the other hand stretch without causing damage to the surface of the cream. It is essential that there is a thin (0.2 to 1.0 mm) layer of bitumen mass between the support layers, which gives the product the necessary rigidity. The good tear strength and nailability properties are due to the mesh fabric.

The table below shows the results of the test runs in which different types of support layer were tested.

In the test runs 4 and 5, the surface felts are products according to the invention.

For comparison, the properties of a surface felt containing only glass felt 2 (80 g / m) and a raw felt as a support layer are also included in the table.

The "stiffness" property in the table is determined for each product by cutting 10 test pieces of 50 x 300 mm from the felt with the longer side in the longitudinal direction of the felt. The stiffness of each specimen was tested at room temperature (22 ° C) by allowing the sample to bend horizontally for a length of 150 mm for 1 minute. The other half of the specimen, 4,60730 (150 mm), was tightly supported on a horizontal base. After one minute, the distance of the bent head from the support point was measured. The stiffness is expressed as the average of the measured distances as a percentage of the length of the part to be bent (150 mm). Thus, the stiffness of a fully rigid body is 100% and the stiffness of a fully flexible body is 0%.

The product according to the invention can be produced with conventional roofing felt machines. However, two bitumen pools are required to ensure consistent quality. In the first basin, the fibers are impregnated with a bitumen mass and coated with a thin layer of bi-dark mass, the thickness of which is adjusted to the desired level, e.g. by means of a scraper. Thereafter, a mesh fabric is introduced from the roll onto the bitumen layer, which adheres to the bitumen. The web then goes to another bitumen basin where the final coating is performed in a known manner. Further, the Sprinklers are applied to the surface of the cream, the cream is cooled and rolled in a known manner. Manufacture of butter. also happen using only one surface-al! asta. In this case, however, the adjustment of the bitumen layers is difficult and the product may be uneven.

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Claims (5)

60730 A bituminous cream, the backing layer of which comprises a non-fibrous mat or felt made of organic or inorganic fibrous material, to which a second layer of fibrous material is glued, after which the backing layer is impregnated and coated with bitumen and a scattering agent is applied to the surface. The second layer is a mesh fabric which, during the manufacturing process of the felt, is glued with bitumen to the fiber mat so that a thin layer of bitumen mass remains between the fiber and the network fabric. Bituminous cream according to Claim 1, characterized in that the nonwoven mat or felt is a glass felt and the mesh fabric is a fiberglass mesh with a mesh size of 2 to 10 mm. Bituminous cream according to Claim 1, characterized in that the nonwoven mat or felt is a glass felt and the mesh fabric is a polyester mesh with a mesh size of 2 to 20 mm, preferably 5 to 15 mm. Bituminous cream according to one of Claims 1 to 3, characterized in that if. the thickness of the bitumen mass layer between the core or felt and the mesh fabric is 0.2 to 1.0 mm. A method of manufacturing a bitumen core according to any one of claims 1 to 3, wherein the support layer of nonwoven or felt and mesh fabric is impregnated and coated with bitumen and a sprinkler is spread on the surface, characterized in that the mesh fabric is attached to the impregnated nonwoven surface. after which the backing web is passed through the coating tank.