FI13250Y1 - Arrangement for applying a surface sizing or coating agent on a fibre web - Google Patents

Abstract

1. An arrangement for applying a surface adhesive or coating agent to a fiber web (W) on both sides of the fiber web (W) directly on both surfaces of the fiber web (W) or indirectly via the surfaces of rollers (20B, 20T) placed on the fiber web (W) both sides on both surfaces of the fiber web in a corresponding manner, which arrangement comprises spray application tubes (10B, 10T) placed on both sides of the fiber web (W), which tubes are in the longitudinal direction, i.e. in the transverse direction of the fiber web (W), equipped with several parallel spray nozzles (15B , 15T) at a distance (D) from each other, all of which are adapted to provide a fan-shaped surface sizing or coating shower (16B, 16T) in direct application to the surface of the fiber web (W) or in indirect application to the roll (20T, 20B ) surface, characterized in that the spray nozzles (15B, 15T) of the opposite side spray application tubes (10B, 10T) of the fiber web (W) are positioned overlapping relative to each other in the transverse direction of the fiber web (W), so that each opposite side spray ay nozzle (15T; 15B) is located at a different point in the transverse direction relative to the opposite side nozzles (15B; 15T). In addition, the protection requirements 2-4.

Description

Arrangement for applying a surface adhesive or coating agent to a fiber web The invention relates to the surface adhesive and coating of a fiber web.

More specifically, the object of the invention is an arrangement for applying a fiber web surface adhesive or coating material to the fiber web using spray technology.

In particular, the object of the invention is an arrangement according to the preamble of protective claim 1.

As known from the state of the art, fiber web machines typically comprise several devices placed in a row, which form a fiber web production line.

A typical fiber web machine comprises pulping equipment, a head box, a wire section, a press section and a drying section and the subsequent roller.

Furthermore, the fiber tape machine can comprise various post-processing equipment, such as surface gluing equipment, a calender, a coating part, which typically comprises a coating machine and a post-drying part.

In addition, a length-cutting part is typically arranged in connection with the fiber web machine, which comprises an unroller, a length cutter and a partial web winder, as well as roll packing equipment.

In surface gluing and coating, a surface sizing agent, such as starch, or a corresponding coating agent is added to the surface or surfaces of the fiber web.

In surface gluing and coating, devices based on different technologies are used to add the surface gluing agent/coating agent, for example, devices that apply spray, pond — mikko, curtain, blade and film transfer technology.

The present invention relates to devices applying spray technology.

As known from the state of the art, in surface bonding and coating, in direct application, the surface bonding agent/coating agent is applied directly to one or both surfaces of the fiber web.

In indirect application, the surface adhesive / = 25 — the coating agent is first applied to the surface of the roll/rolls or another transfer surface, such as a belt, wire or felt, on the surface of the roll/rolls, the surface adhesive ro is led to the nip between the rolls and transferred to the fiber web in the nip.

When applying to one side of the fiber web, the substance is thus only applied to the surface of one roller, and when applying to both sides of the fiber web, the substance is applied to the surface of both rollers.

The present invention relates to the application of a surface adhesive on both sides of a fiber web. [<] E As is known from the state of the art, in double-sided spray application, the surface adhesive/coating agent is first led to the spray application tubes placed respectively on each side of the web, which are in the longitudinal direction, in the transverse direction of the fiber web, equipped with several parallel spray nozzles at a distance from each other, each of which produces a fan-like substance - a spray, which in direct application is applied directly to the surface of the fiber web and in indirect application to the surface of the roll/rolls, on the surface of the roll/rolls, the substance is led to the nip and transferred to the fiber web in the nip.

— One drawback of the arrangements known from the state of the art is achieving a sufficiently even surface adhesive/coating agent layer when applying the spray technique. Typically, when applying spray technology, the fan of surface adhesive created with nozzles applies more substance to the central areas of the spray fan than to the peripheral areas of the fan, so the result of applying the substance is — uneven in the transverse direction of the fiber web, i.e. "striped" in the longitudinal direction of the fiber web. This problem is particularly accentuated when applying the substance to both sides of the fiber web.

The goal of the invention is to create an arrangement that eliminates or at least minimizes the problems described above known from the state of the art.

— The goal of the invention is to create a device that solves the problems of the arrangements known from the state of the art, especially in relation to the uniformity of the surface adhesive application.

In order to achieve the objectives presented above and which will be presented later, the arrangement according to the invention is mainly characterized by what is presented in the characteristic part of claim 1. Advantageous additional characteristics of the invention are presented in the subclaims. N The arrangement according to the invention for applying a surface adhesive or coating agent to a fiber web on both sides of the fiber web, directly on each surface of the fiber web or indirectly via the surfaces of n 25 — rollers placed on both sides of the fiber web, on both surfaces of the fiber web, respectively, includes spray application tubes placed on both sides of the fiber web, which is E in the longitudinal direction, i.e. in the transverse direction of the fiber web, equipped with several parallel spray nozzles D at a distance from each other, each of which is adapted to produce a fan-like spray of surface adhesive or coating agent O 30 — in direct application on the surface of the fiber web or in indirect application on the surface of the roller, in which the arrangement of the fiber web the spray nozzles of the spray application tubes on the opposite sides are placed overlapping in the transverse direction of the fiber web with respect to each other, so that each spray nozzle on the opposite side is placed opposite to a different transverse position with respect to the nozzles on the side of the object.

According to an advantageous additional feature, the nozzles on the opposite side are placed in the middle of the distance between two adjacent nozzles on the same side on the opposite side, whereby the transverse distances between the nozzles on the opposite sides are essentially equal.

According to an advantageous additional feature, the nozzles on the opposite side are placed at a distance between two adjacent nozzles on the same side on the opposite side, so that the transverse distances between the nozzles on the opposite sides are different and each is greater than O.

According to an advantageous additional feature, the distance between two adjacent nozzles on the same side is 15-300 mm, preferably 25-150 mm. With the arrangement according to the invention, a very uniform surface adhesive application result is achieved.

In the following, the invention is explained in more detail with reference to the figures in the attached drawing, to which the invention is not intended to be narrowly limited in any way.

Figure 1 schematically shows an advantageous example of the arrangement in direct application.

— Figure 2 shows another advantageous example of the arrangement in direct application of N.

No. Figure 3 schematically shows an example of an arrangement in indirect application.

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[<] + N In the example shown in Figures 1-3, the fiber web W runs in the depth direction - N of the image.

According to the example in Figure 1, in direct application, the surface adhesive/coating agent is applied directly to both sides of the fiber web W.

The surface adhesive/coating agent is first led to the spray application tubes 10B, 10T placed on each side of the fiber web W, respectively, which are in the longitudinal direction, in the transverse direction of the fiber web W, equipped with several parallel spray nozzles 15B, 15T at a distance from each other, each of which produces a fan-like spray of material 16B , 16T.

The distance between two adjacent nozzles 15B in the spray application tube 10B below the fiber web is D, and correspondingly, in the spray application tube 10T above the fiber web, the distance between two adjacent nozzles 15T is D.

In the example of Figure 1, the nozzles 15T of the upper side and the nozzles 15B of the lower side are overlapped in the transverse direction of the fiber web W with respect to each other, so that the nozzle 15T of the opposite side; 15B is placed with respect to the nozzles of the opposite side 15B; 15T to a different transverse position, whereby the nozzles 15B, 15T — on the opposite sides are not aligned in the transverse direction.

In the example shown in Figure 1, the opposite side nozzles 15B; 15T is placed on the opposite side of two adjacent nozzles 15T of the same side; 15B to the middle of the distance D, whereby the distances L1 and L2 between the nozzles of the transversely opposite sides are essentially equal.

In this case, the fan-shaped substance jets 16B of the two opposite nozzles 15B, 15T: 16T do not coincide, but the opposite fan-shaped substance jet 16B; The central part of 16T hits the opposite fan-shaped substance jet 16T; 16B to the edge area 17A, 17B, whereby an essentially uniform amount of substance is achieved in the transverse direction of the fiber web W and no harmful "striping" phenomenon occurs.

N 25 — According to the example in Figure 2, in direct application, the surface adhesive / coating N is applied directly to both sides of the fiber web W.

The surface lubricant/coating agent is first introduced respectively to the spray application tubes 10B, 10T placed on each N side of the fiber web W, which are equipped in the longitudinal direction E, in the transverse direction of the fiber web W, equipped with several parallel spray nozzles 15B, 15T at a distance of 30 km from each other, each of at time S, a fan-shaped substance jet 16B, 16T is obtained.

The distance between two adjacent nozzles N 15B in the spray application tube 10B below the fiber web is D, and correspondingly, in the spray application tube 10T above the fiber web, the distance between two adjacent nozzles 15T is D.

In the example of Figure 1 — the nozzles 15T of the upper side and the nozzles 15B of the lower side are overlapped in the transverse direction of the fiber web W with respect to each other, so that the nozzle 15T of the opposite side; 15B is placed with respect to the nozzles of the opposite side 15B; 15T to a different transverse position, whereby the nozzles 15B, 15T of the opposite sides are not aligned in the transverse direction.

In the example shown in Figure 2, the nozzles 15B on the opposite side; 15T is placed on the opposite side of two adjacent nozzles 15T of the same side; to the distance D between 15B so that the distances L1 and L2 between the nozzles of the transversely opposite sides are different, but both are larger O, in which case the nozzles 15B, 15T of the opposite sides are not aligned in the transverse direction.

In this case, the fan-like substance jets 16B of the two opposing nozzles 15B, 15T; 16T do not coincide, but the opposing fan-like substance jet 16B; The middle part of 16T hits the opposite fan-shaped substance jet 16T; 16B to a point deviating from the center, which results in an essentially even distribution of the amount of substance in the transverse direction of the fiber web W and the harmful "striping" phenomenon of small

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According to the example in Figure 3, in the indirect application, the surface adhesive/coating agent is led to the surface of the rollers 20B, 20T placed on both sides of the web from the spray application tubes 10B, 10T placed on each side of the fiber web W, respectively, which are in the longitudinal direction, the fiber web W — in the transverse direction, equipped with several parallel spray nozzles 15B, 15T, each of which creates a fan-like substance jet 16B, 16T.

On the surface of the rollers 20B, 20T, the surface adhesive/coating agent is led to the nip N between the rollers 20B, 20T and transferred to the fiber web W in the nip N.

The distance between two adjacent nozzles 15B in the spray application tube 10B below the fiber web is D, and correspondingly, in the spray application tube 10T above the fiber web N, the distance between two adjacent nozzles 15T is D.

In the example of Figure 3, the nozzles 15T N of the upper side and the nozzles 15B of the lower side are overlapped in the transverse direction of the fiber web W with respect to each other E, so that the nozzle 15T of the opposite side; 15B is placed opposite to the nozzles 15B on its side © 30 — ; 15T to a different transverse position, whereby the nozzles 15B, 15T on opposite sides S are not aligned in the transverse direction N.

In the example shown in Figure 3, the opposite side nozzles 15B; N 15T is placed on the opposite side of two adjacent nozzles 15T of the same side; to the middle of the distance D between 15B, whereby the distances L1 and L2 between the nozzles of the transversely opposite sides L1 and L2 are substantially equal. In this case, the fan-like substance jets 16B of the two opposing nozzles 15B, 15T; 16T do not coincide, but the opposing fan-like substance jet 16B; The central part of 16T hits the opposite fan-shaped material jet 16T; 16B to the edge area 17A, 17B, whereby an essentially uniform amount of substance is achieved in the transverse direction of the fiber web W and no harmful "striping" phenomenon occurs. The example according to Figure 3 is also applicable to the example of Figure 2, where the opposite side nozzles 15B; 15T is placed on the opposite side of two adjacent nozzles 15T of the same side; to the distance D between 15B so that the distances L1 and L2 between the nozzles on the opposite sides in the transverse direction are different but both are larger than O, in which case the nozzles 15B, 15T on the opposite sides are not aligned in the transverse direction. In this case, the fan-shaped substance jets 16B of the two opposite nozzles 15B, 15T; 16T do not coincide, but the middle part of the opposite fan-like material jet 16B: 16T hits the opposite fan-like material jet 16T; 16B to a point different from the center, which results in an essentially even distribution of the amount of substance in the transverse direction of the fiber web W and the harmful "striping" phenomenon is reduced. The invention has been described above only with reference to one of its advantageous applications, the details of which, however, have not limited the invention, but many modifications and variations are possible within the framework of the inventive idea.

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No. 5

Reference marks used in the drawing 10B, 10T spray application tube 15B, 15T nozzle 16B, 16T material spray 17B,1/Treuna area 20B, 20T roller D distance between nozzles L1, L2 overlap distance N nip

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Claims (4)

Protection requirements 1. Arrangement for applying a surface adhesive or coating agent to the fiber web (W) on both sides of the fiber web (W) directly on both surfaces of the fiber web (W) or indirectly via the surfaces of the rollers (20B, 20T) placed on both sides of the fiber web (W) for each surface, respectively, which arrangement comprises spray application tubes (10B, 10T) placed on both sides of the fiber web (W), which are equipped in the longitudinal direction, i.e. in the transverse direction of the fiber web (W), with several parallel spray nozzles (15B, 15T) at a distance (D) from each other, of which each is adapted to produce a fan-shaped spray of surface adhesive or coating agent (16B, 16T) in direct application on the surface of the fiber web (W) or in indirect application on the surface of the roll (20T, 20B), characterized in that the spray nozzles of the spray application tubes (10B, 10T) on opposite sides of the fiber web (W) (15B, 15T) are placed overlappingly in the transverse direction of the fiber web (W). relative to it in such a way that each spray nozzle on the opposite side (15T; 15B) is placed in a different transverse position compared to the nozzles on the opposite side (15B; 15T). 2. An arrangement according to claim 1, characterized in that the nozzles (15B; 15T) on the opposite side are placed in the middle of the distance (D) between two adjacent nozzles (15T; 15B) on the opposite side, whereby the transverse nozzles (15B, 15T) the distances (L1, L2) between them are essentially equal. No. 25 3. An arrangement according to claim 1, characterized in that the nozzles (15B; 15T) of the opposite side N are placed at a distance S (D) between two nozzles (15T; 15B) of the same side adjacent to each other on the opposite side, such that the transverse nozzles of the opposite sides The distances (L1, L2) between (15B, E 15T) are different and both are greater c 30 than O. S N 4. An arrangement according to one of the protection requirements 1-3, characterized in that the distance (D) between N two adjacent nozzles (15B, 15T) on the same side is 15-300 mm, preferably 25-150 mm.