CS228638B1 - Reinforcing device - Google Patents

Abstract

The device is a turbine driven hollow shaft to the top the inlet tube foaming mother liquids and air a at the bottom of the hollow shaft at a level the turbine blades are suction openings.

Description

The invention relates to a device for the continuous foaming of polymer solutions or dispersions by means of which the mother liquor is dispensed and sucks a controlled amount of air.

Efforts to save energy in the production of bonded fabrics, treatment of textiles and other sheet formations lead to a wide application of polymers in foamed form. The advantages of bonding with foamed polymers over bonding with aqueous dispersions are obvious, so the only reason why the technique of bonding with foamed polymers in industry is relatively slow to expand is because of the complexity and cost of the existing equipment used for foaming solutions and aqueous dispersions with binders.

Several foaming devices are known. They are used not only in

for foaming solutions and dispersions of polymers for industrial purposes but on a large scale from fire-fighting technology to the food industry and households. However, the properties of foamed materials as well as the requirements for their properties after foaming vary considerably, therefore, simply adopting the technique from one field to another is not possible. Known in

The devices are based on the foaming effect due to mechanical whipping, solved by, for example, vibrations, vibrations or rotations of perforated or articulated bodies. The second principle used in these devices is foaming with a stream of air or other gas blown under pressure. Both principles of the device are also combined, ie mechanical whipping with simultaneous blowing of air. The mechanical and pneumatic foaming method alone is not applicable to the continuous production of uniform foam from polymer solutions and dispersions, provided that a uniform pore size distribution is to be maintained. Therefore, in these cases mainly used a combination of mechanical foam whisking with simultaneous dosing of air and mostly also filtering bubbles above a certain size · A great drawback of these devices is their complexity and associated high

-1 228 638 costs that prevent wider use of economically otherwise very advantageous technologies. This applies in particular to production on smaller units or on lines remote from one location, where several production lines cannot be covered by a single foaming machine. These are mainly lines for the production of bonded fabrics by impregnation of the fleece with foam, lines for the treatment of, for example, needled flooring, or voluminous interweaves for surface attachment of the hair and the like.

These drawbacks are overcome by the foaming device for the continuous foaming of the polymer solutions or aqueous dispersions of the invention. It consists of a turbine placed in a container and driven by a hollow shaft, into whose upper part a tube for supplying foamed mother liquid and air is connected and in the lower part of the hollow shaft at the level of turbine blades, suction openings are formed. According to a further feature of the invention, the foamed binder outlet is located at least twice the height between the turbine ridge and the bottom of the container. The vessel may be circular and the turbine may be located eccentrically, or the vessel may have a triangular, quadrilateral or polygonal plan view, and the turbine may be centered.

The device according to the invention is considerably simpler than the prior art devices and allows well controlled continuous operation with the possibility of regulation by precisely supplying the foaming liquid through the hollow shaft of the turbine foaming body and an adjustable simultaneous supply of the required amount of air.

The invention will now be described in more detail by way of example and with reference to the accompanying drawing, in which: FIG. 1 is a schematic front view of a foaming device in cross-section; and FIGS.

The foaming device for the continuous production of the foamed solution or aqueous polymer dispersions shown in Fig. 1 consists of a turbine 1 located on a hollow shaft 2, into whose upper part 3 a tube 4 with an adjustable dispersion inlet and an adjustable air intake 5 and 6 opens. As shown in FIG. 2, the turbine 1 is disposed in a cylindrical vessel 7, in which a foamed binder outlet 8 is formed in the side wall. It can be placed above turbine 1

228 838 screen 9 with selectable aperture size. In Fig. 3, the container 7 is in the form of a quadrangle and in Fig. 4 it is in the form of a hexagon.

Claims (4)

Foaming apparatus for continuous foaming of solutions or aqueous polymer dispersions, characterized in that it consists of a turbine (1) placed in a container (7) and driven by a hollow shaft (2), into whose upper part (3) a tube (4) is connected. (for intake of foamed mother liquid and air and in the lower part of the hollow shaft (2) at the level of the turbine blades (1), suction openings (6) are formed « 2. Foaming device according to claim 1, characterized in that an outlet (8) is arranged at least twice the height between the ridge of the turbine (1) and the bottom of the vessel (7). The foaming device according to claim 1 and 2, characterized in that the vessel (7) is circular and the turbine (1) is eccentrically positioned, 4. Foaming device according to claim 1, characterized in that the vessel (7) has a triangular, quadrilateral or polygonal plan view and the turbine (1) is located in the center.