SI9300389A - Process and apparatus for dynamic-flow production of ductile, highly-resistant fiber mats - Google Patents

Abstract

Disclosed is a process for dynamic-flow production of ductile, highly tear-resistant fiber mats from a fibrous web consisting of cellulose fibers impregnated with a binder and thermoplastic fibers and/or natural, vegetable fibers, where the apparatus, arranged in the flow direction of the material, consists of a web forming machine (1), a pair of press rollers (3, 4), a pair of draw-in rollers (5), a cylinder (6), an air channel (10) which is fed by ventilators (12) and fitted with one or more control members (25) in the form of one or more adjustable flaps, a venturi rod (7), a diffuser (13), a mat forming roll (15), feed rollers (16, 17), a surface weight measuring device (19), a needle machine (20), a flattening device (21), a cutting machine (22) and a stacking device (24). Disclosed also is the use of a ductile, highly tear-resistant fiber mat produced by the process as per the invention, where one or more of the fiber mats (23, 23') is used for producing form pieces by pressing at elevated pressure and temperature.

Description

KUNSDORFER HOLZFASERMATTENWERK Pacht- und Betriebsgesellschaft m.b.H.

The process of dynamic dynamic fabrication of high tensile strength fiber interlaces as well as the preparation for their production

The invention relates to a process for the dynamic production of deformable high tensile fiber interlaces made of binder-impregnated cellulose fibers and thermoplastic fibers and / or natural fibers of plant origin, wherein the bundle of fibrous webs is mixed in a card drum this mixture, however, forms a fibrous web, which is hardened in a needle machine into a fiber web. It further relates to the use of fabricated fiber interlacing as well as to the preparation for carrying out this process.

The process of the foregoing type is known from AT-PS 387 798. According to a preferred embodiment of this known process, the fibrous web is mixed in the carded drum and from this mixture on the drum to form the further webs. It has been shown that the transport of the fibrous fibrous mass from the carding drum to the web for the formation of the web is not targeted, which results in irregularities of the fibrous cake on the web for the formation of the web, as well as the incorrect distribution of the surface mass over the width of the resulting fibrous web. In addition, it has been shown that artificial resin impregnated wood fibers, due to their higher mass, largely lie on the underside of the resulting web, while thermoplastic and / or non-impregnated natural fibers of plant origin are distributed in the upper layer of the resulting web. This different layering now leads to problems in the further processing of the fiber interlacing, since the underside of the fiber interlacing becomes sticky due to the excess of the binder while there is hardly any adhesive on the upper side.

The object of the present invention is therefore that the deformable high tensile tensile fiber interlayer comprises the correct mass distribution over its width and the formation of a layer consisting of properly mixed fibers of an impregnated and non-impregnated species.

This task is solved by the process according to the invention by feeding the fiber cake 2, 2 'to the carding drum 6, 6', in which the fibrous web cake is pulled apart, and to mix the resulting fiber mass 14, 14 ' with an air stream whose current profile is adjustable with a control element 25, 26 mounted in the air duct 10, 10 ', as well as with a Venturi pole 7, 7' connected in the direction of flow, thus forming a net 18,18 's the proper distribution of the surface mass, which, after this subsequent needle, leads to a compression device 21, 21 ', thereby creating a deformable high-strength tensile fiber 23.23'.

The method of the invention is further characterized by the fact that the control elements consist of a plurality of adjusting flaps 25 distributed along the air duct 10 and of convexly curved and, in their curvature, adjustable control parts 26 extending over the air stream.

The invention further relates to the use of a fiber interlacing made according to the invention, characterized in that one or more of the fiber interlaces 23,23 'is used to make the molds by compression at elevated pressure and temperature.

The invention also relates to a preferred device for the dynamic dynamic fabrication of deformable high strength tensile fiber interlaces of binder impregnated cellulose fibers and thermoplastic and / or natural fibers of plant origin, characterized in that the preparation in the direction of flow of the material consists of a machine 1 arranged one after the other for the formation of a web, a compression roller pair 3, 4, a feed roller pair 5, a card drum 6, an air duct 10, which is fed by fans 12 and in which one or more control parts is arranged 25 in the form of one or more adjusting flaps, a Venturi pole 7, a diffuser 13, a drum 15 for forming a web, conveyor cylinders 16, 17, a flat mass meter 19, a needle machine 20, a compression device 21, a cutting machine 22 and a disposal device 24.

The invention further relates to a preferred device for the dynamic dynamic fabrication of deformable high tensile fiber interlaces made of binder impregnated cellulose fibers and thermoplastic fibers and / or natural fibers of plant origin, characterized in that in the direction of material flow consists of a machine 1 'arranged one after the other for the formation of a web, a compression roller pair 3', 4 ', a feed roller pair 5', a card drum 6 ', an air duct 10', which is fed by fans 12 ', and in which one or more of the curved-shape air-flow regulating members 26 is arranged, the curvature of which is adjustable, the Venturi bar 7 ', diffusion 13', the drum 15 'for the formation of the web, the transport cylinders 16', 17 ', the gauge 19' the surface mass, the needle machine 20 ', the compression device 21', the cutting machine 22 'and the disposal device 24'.

In FIG. 1 illustrates the process of the invention by means of a device designed with a control part in the form of an adjusting flap.

In FIG. 2 illustrates the process of the invention by means of a device with corresponding bar numbers, which is designed with a control part, convexly curved to the air stream.

In FIG. 3 and 4, a perspective view and a principal representation are shown in the process as a control part of a Venturi pole with a schematic flow of air flow.

In the 1, 1 'web forming machine, a mixture consisting of a binder, e.g. duroplasts, thermoplastics or elastomers or mixtures thereof, impregnated and subsequently dried cellulose fibers and thermoplastic fibers, e.g. polyester, polyolefin, polyacrylic, EVA and / or natural fibers such as e.g. flax, hemp and cellulose fibers form a spear cake 2.2 '. This is then compressed with the compression rollers 3, 3 ', 4,4' and fed to the carding drum 6, 6 'by the feed roller pair 5,5', the surface of which is provided with needles or saw teeth extending the web cake 2 , 2 '. With a series of fans 12, 12 'driven along the same axis, an air stream is developed in the air duct 10,10', the speed of which is adjustable by the regulating parts 25,26 distributed over the air duct (see Fig. 2). According to FIG. 1, the regulating parts comprise the shape of a control flap. The control members 25 (see Fig. 1) are convexly curved to the air stream, their curvature being adjustable.

The mixing of fibers in the air stream is further dependent on the flow velocity. This mixing is amplified in accordance with the Venturi pole 7, 7 ', rotatably adjustable by ± 30 ° about its axis, which has a width of variable bridge 8, 8'. In the slots 9, 9 '(see Figures 3 and 4) formed between the bridges 8, 8', the flow velocity of the air-fiber mixture increases with respect to the width of the gap, followed by additional mixing of the fibers in the connected diffuser 13, 13 '. Such a flow velocity further produces a paddle effect, which allows for proper web loading of the fibers 14.14 'to the drum 15.15' for the formation of the web. The newly formed net 18, 18 'is fed to the gauge 19, 19' of the surface mass via the transport rollers 16, 16 'and 17, 17'. These measurement results point to the correct distribution of the surface mass as those of the measurements that could be obtained by known processes for the formation of a net. However, if the mass distribution is unsatisfactory, it can be varied by varying the flow velocity by shifting one or more of the control parts 25, 26. Further, the Venturi pole 7.7 'is further capable of optimizing current conditions.

In this next needle machine 20, 20 ', a needle 18, 18' is a needle with a further needle 27, 27 ', e.g. consisting of polyester, polyamide or glass fibers or jute, thereby forming a sufficiently deformable fiber web 28, 28 '. However, in order to provide better deformability of this fiber interlacing during further processing in mold presses, it is guided through a press device 21, 21 ', which may be e.g. calender or band press. Between the calender rollers, the fiber strand is pressed at a temperature of 25 - 150 ° C and a specific pressure of 5-10 kpcm ' ² , whereby the artificial resin-impregnated wood fibers are more firmly adhered to by foreign fibers. Thereby, the fiber interlacing during further processing e.g. in design compression, it also accepts higher traction forces and is therefore less susceptible to crack formation.

Thereafter, the premeditated interlaces 24,24 'after the passage of the cutting machine 22,22' are deposited on the disposal device 23,23 '.

Claims (6)

1. A process for dynamically fabricating high-tensile deformable high-tensile fibrous webs consisting of binder-impregnated cellulose fibers and thermoplastic fibers and / or natural fibers of vegetable origin, mixing the fibrous web cake in this mixture of carded drum however, a fibrous web is formed, which is hardened in the needle machine into a fibrous web, characterized in that the fibrous cake (2,2 ') is fed to a cardiac drum (6,6') in which the fibrous web cake is pulled apart, and that the resulting fiber mass (14, 14 ') thus mixed with the air flow whose current profile is adjustable with the control element (25, 26) mounted in the air duct (10,10') as well as with the Venturi bar (7, 7 ') connected in the flow direction, thus forming a web (18,18') with a proper distribution of the surface mass, which, after this subsequent needle, leads to a compression device (21, 21 '), thereby creating deformab high fiber tensile fiber web (23, 23 '). A method according to claim 1, characterized in that the control elements consist of a plurality of adjusting flaps (25) distributed along the width of the air channel (10). Method according to claim 1, characterized in that the control elements consist of several convexly curved bends and, in their curvature, adjustable control parts (26). Use according to claim 1 of the fabricated high-tensile deformable fiber interlayer, characterized in that one or more of the fiber interlaces (23,23 ') is used to produce the molds by compression at elevated pressure and temperature. 5. A device for dynamic dynamic fabrication of high-tensile deformable fiber webs consisting of binder-impregnated cellulose fibers and thermoplastic fibers and / or natural fibers of plant origin, characterized in that the upstream material preparation consists of a machine (1) arranged secondly for the formation of a web, a press roller pair (3, 4), a feed roller pair (5), a card drum (6), an air duct (10) which is powered by fans (12) and in which one or more control members (25) are arranged in the form of one or more adjustment flaps, Venturi rod (7), diffusion (13), drum (15) for the formation of the web, conveyor cylinders (16, 17), surface gauge (19), needle machine (20), press (21), cutting machine (22 ) and disposal facilities (24). 6. A device for dynamic dynamic fabrication of high-tensile deformable fiber webs consisting of binder-impregnated cellulose fibers and thermoplastic and / or natural fibers of vegetable origin, characterized in that, in the direction of material flow, other machine (1 ') for forming a web, compression roller steam (3', 4 '), feed roller steam (5'), card drum (6 '), air duct (10') which is powered by fans ( 12 ') and in which one or more of the curved-shape, air-curved, flow-regulating elements (26) is arranged, a Venturi pole (7'), a diffuser (13 '), a drum (15') for forming a web , conveyor rollers (16 ', 17'), plate gauge (19 '), needle machine (20'), compression device (21 '), cutting machine (22') and disposal device (24 ').