FI73745B - FOERFARANDE OCH ANORDNING FOER FRAMSTAELLNING AV EN BANA AV EN SUSPENSION AV SYNTETFIBRER. - Google Patents

Description

NOTICE PUBLICATION

; <'-' S <*?> I [B] (11) UTLÄGGNINGSSKRIFT 737 4 5 I i! C (45) Γ: te '-ty n *. I - -: .- ru: i .7 (51) <v.lk4 / int.Cl4 D O ') H 5/00

SU0M1-FIIMLAND

(Fl) (21) Patent application - Patgntansökning 800590 (22) Application date - Ansökningsdag 27-02.80

National Board of Patents and Registration (23) Start Date-Giitighetsdac 27-02.80

Patent- och registerstyrelsen (41) Published public - Biivit o ^ entiig 29-07-80 (44) Date of publication and of publication. - 31.07.87

Ansokan utlagd och utl s ^ riften publicerad (86) Kv applicationus- Int. ansokan (32) (33) (31) Requested interest- Begärd pnontet 28-03-79

German 1 i it totasavaita-Förbundsrepubliken

Germany (DE) P 2912153-7 Proven-Styrkt (71) Glaswerk Schuller GmbH, Faserweg 1, Wertheim / Main,

German Federal Republic of Germany (DE) (72) Heinz Keib, We r the i m / Ma i n, Fredo Schlachter, Johannesbe rg,

Josef Lirb; tsch, Werthe im / Ma i n, Gunter Wiegand, Has Loch / Ma in,

Germany 1 iittatasava1ta-Förbundsrepuoliken Tysk) and (DE) (74) Leitzinger Oy (54) Method and apparatus for making a web from man-made fiber slurry -Förfa rande och anordning för framstä11 Ning av en bana av en suspension av synthtetfibrer

It is generally known to produce webs or thin mats from a slurry, i.e. a suspension, of man-made fibers, in particular glass fibers, as such or by adding binders, dyes and the like to the water mixed with the fibers. These methods use a pulp feeder connected to the supply line, based on a water-permeable conveyor belt on which the fiber slurry flows. Usually, the conveyor belt is arranged obliquely forward in the direction of travel, while the suction boxes arranged on the other side of this conveyor belt, opposite to the passage of the slurry, remove as much water as possible from the aqueous fiber suspension. The fibrous layer thus formed is conveyed away from the sludge feed point by a conveyor belt and then subjected to other processing steps, e.g. post-drying, finishing, smoothing and the like, and thus into a fibrous web.

This method makes it difficult to handle long fibers, e.g., fibers longer than 60 mm, which have a beneficial effect on the strength of the final product, because they tend to form flocs or agglomerates in storage and working ponds and on the way to the slurry feeder. Admittedly, this detrimental flocculation can be reduced and thus longer fibers can be utilized when working at high dilution, i.e. the fiber fraction in the fiber-water suspension is reduced, but this entails the considerable disadvantage of very large amounts of water circulating and having to be removed from the pre-web.

In order to achieve the desired strength in practice when using a normal amount of water, despite the necessary use of shorter fibers, it is known to embed reinforcing yarns or sometimes also reinforcements in the form of fabrics running in the longitudinal direction of the web. A known continuous pulp feed device (German Offenlegungsschrift No. 23 06 143) is provided with guide tubes for reinforcing wires embedded in the feed slurry, which act as vortex generators and terminate in the vicinity of the conveyor belt. A wire drawn from a spool is passed through each discharge tube, which, taken with the flowing suspension, is guided against the conveyor belt and embedded in the web formed thereon. This known method ensures good and proper guidance of the individual reinforcing wires parallel to each other and to the right, to the height guaranteeing immersion, but it is difficult to implement when feeding a large number of reinforcing wires to the width of the web to be made, i.e. the wire spacing must be kept small. Namely, with the increasing density of the wires, it becomes increasingly difficult and finally impossible to place a correspondingly large number of guide tubes in the pulp feeder. In practice, wire spacing of 5 mm is also possible, and even at such small distances there are already difficulties. Admittedly, in a long slurry feeder, a larger number of guide tubes could be placed so that these tubes were not arranged side by side, but in several rows at intervals in succession, but in certain cases the flow space in the plate former would be filled. A prerequisite for staggering a plurality of guide tubes in several rows is then also the placement of reinforcing wires in several, i.e. different, levels of the web. Furthermore, the threading of reinforcing wires into the pipes when changing the coils or breaking the wires also presents certain difficulties which come with a considerable increase in the number of wires and finally the large number of pipes limits space for other and the like.

In another known device (German Patent Publication No. 19 06 334), the sludge feeder is made into a so-called multiple sludge feeder, i.e. it is divided into several chambers. The division takes place by so-called upper lips, i.e. by surfaces curved in the flow direction, extending over the width of the box, which at the same time act as guides for reinforcing wires or similar reinforcing elements. In this known system, the embedding of the reinforcing wires in the web is effected by first forming a thin layer of wire in the first or rearmost chamber in the flow direction, on which the reinforcing wires are then fed. Then, in the flow direction, a second web layer is passed over the first layer and the yarns on it in the second, i.e. front, chamber comprising a special sludge inlet.

When using such a device, it has been found in practice that the individual yarns do not always sink exactly parallel to each other in the web. The reason for this is that the flow in the first chamber takes place against the back of a large, upper lip-forming plate, and usually the wires sliding along this lip surface tend to move. In addition, it is very difficult to position the web-side ends of the lips exactly so that, on the one hand, they are exactly above the conveyor belt to separate the chambers, and on the other hand, so that the layer formed in the first chamber does not tear. But when the lower edge of the lip does not end very close to the web layer formed in the respective chamber, the reinforcing wires guided under it under stress will not be passed immediately through the lip end onto the 4 73745 web layer, but most preferably only at a certain distance therefrom. However, in the worst case, the reinforcing yarns do not sink properly at all and prevent the formation of the next web layer that must be covered by the yarns. The more the lip is moved in the direction towards the conveyor belt to avoid the disadvantage now described above, the greater the risk of the web layer tearing, and possibly even the conveyor belt being damaged. Also, hangings or clumps are formed at the ends of the lip sinking into the slurry feed, i.e., clumps of yarns that from time to time become detached from the flow and separate into the web into turbidity or very “tightly.” The placed lip damages the resulting web.

It is also known from U.S. Pat. No. 1,870,276 for a technique for making paper webs at the end of a unitary, undivided slurry feeder before the web forming table from which the conveyor belt takes the web, a perforated roll completely submerged in the slurry and thus interfering with slurry flow. However, with such a device in a multi-chamber system, together with a separate slurry feed connected to each chamber, no particular advantages have been observed in that the reinforcements are securely submerged due to the special provision of the substrate and at least one upper layer.

The object of the present invention is to improve known slurry multilayer feeding systems in such a way that a large number of reinforcing yarns can be placed in absolutely parallel and possibly also reinforcing elements of different shape and quality in the clump-free web.

According to the invention, this object is solved as set out in the claims.

The device according to the invention is based on the knowledge that the shorter the guiding distance on the guide surfaces, the less guided the free-to-reach guides, the less guided the lower the guiding distance, the less guided the current at each of the guiding surfaces. This is the case with the device according to the invention, and furthermore the time during which the unit of length remains on the guide surface is shortened so that the element distributing the slurry supply to the chambers and simultaneously guiding the wires moves, so the risk of lateral displacement or loop compression is practically burned.

In this case, the separation and wire control element of the chambers is of such a quality as to ensure a safe separation of the sludge into the different chambers and to prevent damage to the layer or layers to be formed and the formation of so-called hanging wires.

It is often desirable to make the web into embedded yarns with embedded yarns, which yarns do not act as reinforcing yarns, and therefore do not have to be tensioned parallel to each other, but must be placed helically and / or tortuous (so-called swirling) relative to the reinforcing yarns. In this way, a general increase in strength can also be obtained in the web, regardless of the direction of the yarns, and in addition a certain increase in the stiffness of the web is achieved. It is the helical reinforcements (so-called swirls) that are fitted to the edge areas, for example, increase the tear and tear strength to a large extent. In addition, it should also be mentioned that such vortices also provide very good nailing strength. This is needed when the web thus reinforced is used, for example, as a support for roof strips or tiles, which are fastened by nailing to the roof panels.

In the case of roofing tiles in particular, the above-mentioned rigidity proves to be even more advantageous, since roofing tiles made of a web thus reinforced provide not only good handling but also considerably greater resistance to frequent wind suction in the placement space.

___ - ττ ^ e 73745

In order to increase the strength of nailing and / or tearing and further tearing, it is often sufficient in this case that additional reinforcements in the form of layers, vortices or the like are also placed only in streaks where high stresses are present in the finished product.

By placing such loops or tortuously embedded yarns, the previous uncertainties with respect to the predetermined height and lateral position of the web according to the invention are eliminated so that the yarn planes, together with possible additional reinforcements in the form of so-called swirls or the like, take up the holding task. .tightening vortices from top, bottom as well as sides.

To illustrate the invention, several application examples are schematically shown in the drawings and will be explained below with reference to the drawings, in which:

Figure 1 shows a vertical section very schematically and on a substantially small scale of a device according to the invention.

Fig. 2 similarly shows a change of the device according to Fig. 1 on the same scale.

Figure 3 shows, in larger size and in vertical section, the most essential parts of the device according to Figures 1 and 2.

Figure 4, like Figures 1 and 2, shows a vertical section of a still further modified device.

In Fig. 1, reference numeral 1 generally denotes a box-shaped slurry feeder to which the slurry is introduced as a fiber-water suspension 2 via a line 3. Reference numeral 4 schematically denotes a water-permeable conveyor belt having a base 5 in the part at the slurry feed, which is usually also called the plate forming area. The fibers contained in the suspension 2 are placed on the conveyor belt 4 at the base 5 73745 as a gauze-like layer and the water part is removed as much as possible by means of the suction box coil 6.

The slurry supply box 1 is divided by a roller 7 into two chambers 8 and 9, the chamber 9 being protected by a divider 10 and partition walls 11a, 11b for a slurry in the form of an aqueous-fiber suspension.

Reference numerals 12a and 12b denote schematic rows of spools adapted to the width of the slurry feeder, from which the reinforcing wire rows 13a, 13b run to the rear side of the chamber separation and wire guide roller 7 and from there to the lower web layer formed in the chamber 8. Then, on top of this layer and on the yarns on it, a surface layer of the web is deposited in the chamber 9, and thus the layer formed by the yarns 13a, 13b sinks into the web. In this case, the desired position of the immersion can be influenced by horizontally changing the position of the divider 10 or by acting in such a way that the chambers 8 and 9 are adjusted to a different amount and / or density. Of course, this also makes it possible to make the web from different fiber grades, e.g. short and long fibers or glass and plastic fibers, etc.

Fig. 2 schematically illustrates that the slurry feeder, generally indicated by reference numeral 14, can be provided e.g. with three chambers 15, 16 and 17 having separate slurry feeders 18, 19 and 20 and corresponding rollers 21 and 22 for dividing and reinforcing the feeder chambers, thus providing on the conveyor belt 23, a web in which two reinforcing layers formed by the rows of yarns 24a, 24b and 25b are arranged one on top of the other and separated by an intermediate layer.

In a larger size than Figures 1 and 2, Figure 3 shows a section of a device according to the invention with inventively essential parts. The roller separating the slurry feeder chambers 26 and 27 and guiding the reinforcing wires 28 is denoted by reference numeral 29. It is mounted on arms 30 attached to bogies 8 73745 31. A wire guide roller 33 is also mounted on the arms 32 to tension the wires 28 and protect individually or in groups the wires via the separating plate 33a from the lateral displacement. The slurry distributor for the chamber 27 is indicated by reference numeral 34 and its distribution end is indicated by reference numeral 35. The water-fiber suspension flowing out through the openings or slots 36a, 36b is calmed by dam plates 37 and 38.

According to the invention, the individual liquid surface level of the sludge feed is adjusted so as to be as low as possible in the downstream, i.e. first chamber 26, near the separation and guide roller 29, as indicated by reference numeral 39, while higher in the chamber 27 outside the dam plates 37 and 38; inside the space 40 bounded by the dam plates is even quite high. In this way, a secure, predetermined immersion of the yarns 28 in the web can be provided, i.e. care is taken that they do not come out of the surface of the web. Reference numeral 41 denotes an end roller.

The roller 29 is expediently positioned so close to the conveyor belt that it rotates under the action of the belt or the layer of fibers deposited thereon, and its support is expediently such that it can be provided upwards with unusually large congregations of fibers, so-called lumps.

Figure 3 also illustrates very clearly that the device according to the chamber separation and wire guide roller according to the invention, e.g. by means of the wire guide roller 33, allows the winding angle around the roller 29 to be kept small.

In a further modified embodiment of the device according to Fig. 4, wedge-like converging wire planes 43 and 44 are passed to the chamber separation and wire guide roller 42. Wires 46 are drawn from the spool 45. In addition, the wires 46 pass, e.g., through nozzles 47. providing a higher velocity at the outlet of the nozzles 47 than the discharge velocity of the yarns 43, 44, resulting in their tortuous or tortuous placement between the wedge-shaped tapered reinforcing wires, thus securely held in place and securely superimposed on the gauze formed in the first chamber. In this case, the yarn planes formed by the yarns 43 and 44 provide a kind of retention function. Of course, the nozzles 47 may also be provided with a reciprocating motion to promote the distribution and / or formation of the vortex. As already mentioned above, the invention further achieves the advantage that the arrangement of the additional reinforcements in the form of so-called vortices or the like can also be achieved only in streaks, i.e. at the points where they are needed.

Claims (6)

A method for producing a web of conat fiber mud (2), in particular of water-containing glass fibers, in which method the body is guided against a water-permeable conveyor belt (4) on which the fibers accumulate in a layer, and through which water is sucked into the frame, and in which process the frame is led to at least two, in the direction of transport, one after the other, web-separated zones (8-9 »15-17, 26-29) and labeling elements (13, 24, 25) , 28, 43, 44, 46) in the form of trees, tissues, or the like, along at least one web forming zones separating wall, characterized by the reinforcing elements (13, 24, 25, 28, 43, 44, 46) through the movement of the partition is directed towards the conveyor (4) on the already layered mud layer, the partitions of the partitions being made into a closed path. Method according to claim 1, characterized in that the partitions of an eluted web made of parts are moved with the aid of the conveyor belt (4). Method according to Claim 1, characterized in that, as reinforcing elements (13, 24, 25, 28, 43, 44, 46), at least two incoming tree rows are used at different angles between which a third reinforcing layer is guided, e.g. in the form of a tissue, winding trees or the like. Method according to claim 1, characterized in that in the respective web formation zones (8-9, 15-17, 26-27), which in the transport direction n follow one another, in each zone the upper surface of the frame has been controlled higher than in the preceding zone. Apparatus for realizing a method according to claim 1, in which the apparatus has been distributed to a plurality of chambers (8-9, 15-17, 26-27) in each case, a separate feeding device (3, 18) provided with a separate sludge supply line (3, 18). (1, 14) for sludge, the bottom of which is a water-permeable crane conveyor belt (4, 23), the