FI123602B - Jet nozzle construction and method for applying material to a moving surface - Google Patents

Description

JET Nozzle Structure and Method for Applying Material to a Moving Surface

JET-MUNSTYCKESKONSTRUKTION OCH ETT FÖRFARANDE FÖR ATT APPLICERA ÄMNE PTA I RÖRELSE

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Field of the Invention

The invention relates to a jet nozzle structure as defined in the preamble of independent claim 1.

The invention also relates to a method 10 for the application of a moving surface as defined in the preamble of independent claim 11.

This invention relates to a coating machine for applying a coating agent directly or indirectly to a moving surface. The present invention also relates to an adhesive press for applying a surface adhesive or a pigment-containing adhesive to a moving surface. In other words, the present invention relates to coating and surface sizing. In the case of direct application, the movable surface is the outer surface of a paper or board-like material web or, in the case of indirect application, the external surface of the transfer element, such as a transfer roll capable of transferring coating material, glue or pigmented adhesive to the material web. The transfer element may also be, for example, a belt such as a metal belt or any other suitable belt for this purpose, or the transfer element may be any other transfer element suitable for transferring the coating material, adhesives or pigmented adhesive to the material web. Henceforth, when using the coating machine term, it also covers the rk surface sizing machine and, when using the coating agent term, it also encompasses o i T glue and pigmented glue. The jet coating nozzle applicator according to the invention can x apply a coating agent, glue and / or pigmented glue, cr

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The coating machine according to the invention is a jet nozzle structure comprising a nozzle applicator

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g for applying a coating agent, pigmented adhesive, or adhesive to said surface to be treated with said agent. The nozzle applicator comprises an inlet chamber and a nozzle slot delimited on the inlet side by the inlet lips and on the inlet side by a relation to the moving surface.

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There are mainly two types of jet nozzle applicators. One type of nozzle applicator is made from a single piece such that the nozzle applicator is of solid construction and another type of nozzle applicator is made from a plurality of pieces so that the nozzle applicator can be opened, for example for cleaning.

The problem with the first type of nozzle applicator is that the single piece structure of the nozzle applicator, which has a lip gap defined by a pair of feeding lips, is dimensionally stable. This means that as the coating material feed rate rises, the pressure inside the chamber will also increase. Due to the increase in pressure, the nozzle structure expands and the lip gap widens. As the lip gap enlarges, the flow rate of the coating material flowing out of the lip slot decreases. This 10 causes problems because the flow rate of the coating material coming out of the lip gap towards the surface to be coated must be sufficient to displace the boundary layer of air passing along the surface of the moving web. If the impulse force of the coating material leaving the lip gap is not sufficient, the boundary air will cause uncoated spots on the web. These uncoated areas are also called coating defects. In other words, the coating defects are caused by the air penetrating the coating material 15 which prevents the coating material from uniformly touching and spreading uniformly onto the web surface. While the application of a coating agent should preferably result in a coating that is continuous and uniform over the entire web, coating defects are one of the issues that cause problems with the quality of the coated web. To avoid coating failure problems, the coating applicator may include 20 venting systems, but nevertheless some air may remain inside the coating and touch the web, causing coating defects on the web, especially at high speeds past the applicator. In addition, air entrained in the web causes unevenness in the applied coating. It is also difficult to obtain sufficient penetration of the coating material i o into the web. As the web speed increases, a greater impulse force of the coating material i 5 per web is required to displace the boundary air. This means that the volume of the ir coating material must be higher and / or that the volume from the nozzle applicator should be rv. the contact angle between the coating material and the web must be greater, co

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One problem with another type of nozzle applicator, made of several pieces, is that the construction is complicated and expensive to manufacture. The opening nozzle must have contact surfaces 30 between the feed chamber and the lip opening, preferably in the vicinity of the lip opening. This means that the contact area changes every time the nozzle is opened and closed again and this causes problems.

One key condition for achieving a good result in the coating of a moving web of material is that the coating agent exits the lip slit at a sufficient pressure to displace the boundary air passing along the surface of the web 5 to achieve a uniform coating. Although only the aforementioned coating is mentioned, this also applies to surface adhesive and pigmented adhesive.

US 6,579,366 B2 relates to a coating machine for directly or indirectly applying a coating agent to a web of material designed to apply a liquid or thick-flow coating agent to a moving surface. The coating machine includes 10 dispensing nozzles to release the coating material onto the moving surface and provides an improved mechanism for adjusting the nozzle opening height. The function of the adjustable nozzle orifice is to balance the pressure pulses occurring in the nozzle orifice in the coating material supply. An adjustable nozzle opening is formed by a nozzle lip, at least one of which is a blade element.

US 6,579,366 B2 discloses a control mechanism in which the nozzle orifice height 15 is adjusted by a flexible nozzle lip, which helps to rapidly and temporarily expand the nozzle orifice as the pressure of the coating material applied to the nozzle orifice increases temporarily. This momentary and sudden change in the nozzle opening is seen as an uneven web coating, which is not the desired quality in the paper or board web.

US 6,579,366 B2 discloses a jet coating method for applying a coating mix 20 at ambient pressure without using a pressurized chamber. coating mix

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1 is applied through a channel narrowing to the slot-shaped mouth. The mouth width of the slot-shaped mouth is adjustable by a screw and this width adjustment affects the flow rate of the coating mix. With constant volume feed o the coating mix outlet rate increases when the slot-shaped orifice is adjusted to cc 25. The upper lip of the jet coating machine may also be arranged to be adjustable relative to the body of the coating machine. This allows transverse channel adjustment.

U.S. Pat. No. 6,579,366 B2 discloses a constant volumetric input c / j of coating mixing and the problem of required rate controls. This problem is solved by adjusting the slot-shaped mouth.

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Purpose of the Invention

It is an object of the invention to provide a nozzle applicator for applying a liquid coating material, a surface adhesive or a pigment-containing adhesive, either directly or indirectly, to a paper or board web in which the resulting coating or adhesive is substantially flawless and uniform.

Another object of the invention is to provide a nozzle applicator for applying a liquid coating agent, a surface adhesive, or a pigment-containing adhesive, wherein the nozzle applicator has a standard or predominantly pressure changes.

BRIEF DESCRIPTION OF THE INVENTION The jet nozzle structure of the invention is known from the definitions of independent claim 1.

Preferred embodiments of the jet nozzle assembly are defined in the dependent claims 2 to 10.

According to the invention, the method for applying the agent to the moving surface is, respectively, known from the definitions of independent claim 11, and preferred embodiments of the method for applying the agent to the moving surface are defined in the dependent claims 12-13.

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co From now on only coating and coating agent are mentioned, although this also applies to surface sizing co o and application of pigmented adhesive o

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According to the present invention, the coating pressure prevailing in the feed chamber is applied to the nozzle structure such that the lip gap remains essentially the same all the time and no increase or decrease in lip size occurs despite the prevailing coating pressure or coating pressure.

The present invention relates to a jet nozzle structure having a nozzle applicator for applying a substance such as a coating agent, a surface adhesive or a pigmented adhesive to a moving surface such as a web of material or a roll. The nozzle applicator extends in a direction transverse to the movable coating or surface sizing surface and comprises an inlet chamber for receiving material from the inlet means, the inlet chamber being limited by chamber walls and the nozzle applicator further comprising a nozzle slot which is limited by a nozzle slot. The nozzle slot is in fluid communication with the inlet chamber, where the substance 10 is arranged to be supplied from the inlet chamber to the nozzle slot. The nozzle slot terminates in the lip cavity to deliver a substance in the form of a jet from the nozzle slot to a movable surface. The nozzle applicator further comprises means for compensating for the deformity of the lip gap. The lip deflection compensating means comprises at least one wall of a flexible supply chamber so that it can deliver up to the pressure of the supply chamber. The feed lip is arranged to communicate with said at least one resiliently arranged chamber wall. The lip gap deformation compensating means may comprise a support structure having at least one hinged support arranged in connection with a nozzle applicator, and the at least one hinged support may be arranged to communicate with the feed lip which is connected to the flexible chamber wall. The nozzle structure may further comprise a support arm for supporting the nozzle applicator. The nozzle applicator and the control arm can be connected by means of adjusting elements. The nozzle applicator and the control arm can be connected to each other by a floating mounting system, which means that the nozzle applicator and the control arm can be connected to one another allowing movement between the nozzle applicator and the control arm.

An adjustment means is provided between the at least one flexible chamber wall and the support structure for adjusting the flexibility of the flexible chamber wall. The adjusting means may be a pneumatic and support means for adjusting the elastic region of the at least one chamber wall to a pressure level rv. adjusting. The transverse direction of the flexible chamber wall may be adjustable by an adjusting means.

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In other words, the present invention relates to a jet nozzle structure comprising a nozzle applicator comprising at least one feed chamber wall structure that is thin enough to accommodate the pressure in the feed chamber. This means that as the pressure rises 6, the wall structure will give up due to the pressure increase and when the pressure drops, the wall structure will return to its normal position. This means that as the pressure in the feed chamber rises, the feed chamber will expand due to the pressure increase and the thin feed chamber wall structure will provide. As pressure drops in the feed chamber, the thin wall structure 5 is able to recover as it was before the pressure was applied.

The nozzle applicator preferably comprises one feed lip fixed to the nozzle applicator and one feed lip fixed to a thin flexible chamber wall structure such that the feed lip is supported by a hinged support forming part of a support structure arranged in connection with the jet coating nozzle structure. The support structure may be a separate structure 10 attached to the same support arm as the nozzle applicator or may be part of the nozzle applicator itself. The feed lip is preferably supported by a hinged support located in the middle of the feed lip. The hinged support may be arranged to support the feed lip or feed chamber or both the feed lip and the feed chamber. Even if both feed lips are arranged so as to be affected by a flexible wall structure, the hinged support may be provided on both feed lips.

The pressure of the coating agent acts on the inside of the feed chamber and in the nozzle slot, as the coating agent moves down the nozzle slot towards the lip. Without any hinged support, the wall structures will yield and the lip will expand due to the pressure in the feed chamber and / or nozzle slot, causing the feed chamber and / or nozzle gap to expand. Otherwise, the nozzle applicator 20 must be made so rigid that there is no change in the structure and then the lip gap remains stable, co ° According to the invention, at least one wall of the feed chamber is made flexible enough to adapt to the pressure in the feed chamber. The flexibility i q of the feed chamber is preferably achieved by a thin wall structure. There may be more than one flexible wall structure and / or the bottom of the feed chamber may also be made flexible. Flexible

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fv. the wall or the flexible wall structure also covers the bottom of the feed chamber or the upper end of the feed chamber co [n], which may also be flexible. The support structure is arranged adjacent to the nozzle applicator, preferably adjacent to the feed chamber wall which will provide and

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the hinged support is preferably arranged to contact the feed lip which is on the same side of the nozzle slot as the flexible wall. Since the wall of the feed chamber is made flexible, its shape 7 changes, and due to this change in the feed chamber wall, the nozzle slot also changes its position in the area adjacent to the hinged support. The head of the feed lip, i.e. the tip of the feed lip that forms the lip opening, is at a distance from the hinged support. The change in angle 5 due to the deflection of the wall structure caused by the pressure increase of the feed chamber causes the feed lip to move horizontally. At the same time, the support structure causes the hinged support to move horizontally in the opposite direction to the tip of the feed lip. Due to these two horizontal movements, the change in the tip of the feeding lip is zero, so that the lip gap remains the same. The pressure compensation can be set to the desired level by changing the dimensions of the structure, such as changing the wall thickness and / or the length of the elastic region of the chamber wall affected by the pressure inside the feed chamber. The hinged support is preferably arranged such that the pressure of the nozzle slot and the supply chamber, and in particular the upper part of the supply chamber, does not cause torque around the hinged support.

The main idea of the present invention is that the at least one wall structure surrounding or at least partially surrounding the nozzle applicator 15 is flexible enough to bend or give due to the pressure in the supply chamber such that the expansion chamber is flexed or pressurized as the supply chamber expands. This is preferably achieved by a thin wall structure. At the same time, a support structure is provided to keep the gap mouth 20 substantially the same regardless of changes in pressure or coating material feed rate or regardless of any other matter including coating material ςτ) properties such as viscosity, pressure, etc. This one nozzle applicator wall design be the feed chamber wall or the feed chamber bottom or io any other wall or part thereof. The support structure may be an integral part or separate part of the jet coating nozzle structure and may be removably arranged in the nozzle structure. The fact that the support structure is an integral part of the jet coating nozzle may also rv. means that, for example, when the bottom of the feed chamber is made flexible and support is needed co

Not for a large portion of the feed lip area, and presumably both feed lip, the support structure can then be integrated so that the material has a thickness greater than that normally used for supporting wall structures. For example, the separate support structure may be removably attached to the jet coating nozzle by means of attachment or may be fixedly attached, such as a welded structure.

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Preferably, the support structure is provided when the position of the hinged support lip of the feed lip is selected such that the pressure in the upper part of the feed chamber and in the nozzle slot does not result in torque 5 around the hinged support.

With the support structure being a separate part so as to create a space between the support structure and the nozzle applicator, the range of flexible feed chamber wall can be adjusted by positioning the profiling element between the chamber wall and the support structure for adjusting the wall elasticity. This adjustment can be made by 10 adjustment means, such as a pneumatic support.

One advantage of the structure according to the invention is, for example, that the use of the material can be optimized because the dimensions of the support structure can be designed to form a resilient structure instead of a rigid structure which is more massive than the resilient structure. The nozzle applicator may be supported by a separate support arm as the nozzle applicator deflects more than its own structure can handle. This means that the critical parts of the nozzle applicator can be the same regardless of width, since the support structure is able to handle the bending and keep the lip gap of the same size. It is also an advantage that the structure can be made from machined parts when uncontrolled deformations due to stress during welding do not interfere. The support structure may be made, or at least partially made, of composite materials. The composite material can even be used in a nozzle applicator.

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The invention also relates to a method of applying an agent such as a coating agent, a surface adhesive or a cis. for applying a pigmented adhesive to a moving surface. The method comprises the step o 'of providing a nozzle applicator in the vicinity of a movable surface, which nozzle applicator o comprises a feed chamber and a nozzle slot in fluid communication with the feed chamber to deliver material cc 25 to the nozzle slot. The feed chamber is defined by the chamber walls and h.

co feed chamber receives material from the feed medium. The nozzle slot is delimited by the input lips and ends at the lip. The method also comprises the step of applying an agent to the movable surface of the lip cavity and employing means for compensating for the deformation of the lip cavity. Preferably, the method provides means for compensating for a lip deflection 9 by providing at least one of the feed chamber walls with a flexible arrangement that provides a feed chamber pressure due to and providing a support structure for supporting at least one feed lip. The method preferably spreads the material onto the movable surface by providing at least one feed lip along at least one flexible chamber wall 5.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the figures in which

Figure 1 illustrates a jet coating nozzle assembly comprising a nozzle applicator and 10 support arms,

Figure 2 shows a nozzle structure according to the invention, and

Figure 3 shows another embodiment of a nozzle assembly according to the invention.

DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows an example of a jet-coating nozzle structure 1. The jet-coating nozzle structure 1 comprises a nozzle applicator 2 and a support arm 3. The nozzle applicator 2 is preferably adjustably arranged on the support arm 3 by one or more adjustment elements 4. By means of the adjusting elements 4 the nozzle applicator 2 and the support arm 3 can be adjusted, for example, directly to the position. The adjusting elements 4 are an additional feature of the jet coating nozzle structure 1 i 20 and are not necessary for the operation of the nozzle applicator 2 i ^ according to the invention. The nozzle applicator 2 and the support arm 3 can also be coupled together by a floating mounting arrangement such that the connection permits movements caused by temperature changes. Otherwise

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that is, the nozzle applicator 2 and the support arm may be provided by means of a joint, such as a coil mounting means comprising a joint selector that permits relative movements due to thermal expansion or the like. The nozzle applicator 2 itself comprises chamber walls 6

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limited by the supply chamber 5 and the nozzle slot 7 extending from the supply chamber 5 towards the lip 8 so that the coating material (not shown) within the supply chamber 5 can flow through the nozzle slot 7 and exit the nozzle applicator 2 lip orifice 8. of any shape suitable for feeding a coating agent per nozzle slot 7. The coating material is preferably supplied to the feed chamber 5 at one or both ends of the nozzle applicator or at any other suitable location. The nozzle slot 7 consists of a supply lip 9, 10 in which one of the supply lips 9 is on one side of the nozzle slot 7 and the other supply lip 10 is on the opposite side of the nozzle slot 7. The feed lip tips, i.e. the feed lip ends, form the lip 8. In this example, the counter roll 11 supports the web (not shown) so that the web moves along the back roll surface 12 as it passes through the coating station to maintain a constant distance between the web.

Figure 2 is a conceptual figure which does not show the actual geometry of the nozzle applicator 2 according to the invention, wherein the nozzle applicator 2 comprises a supply chamber 5 surrounded by a chamber 6a, 6b, 6c, 6d and a nozzle slot 7 defined by the supply lips 9, 10. 6d is made flexible to accommodate the pressure in the supply chamber 5. At least one of the feed lips 9, 10 communicates with at least one chamber wall 6a, 6b, 6c, 6d, which is mated to be resilient. The nozzle applicator 2 in this example also comprises a support structure 13 which is mated to the nozzle applicator 2. As part of the support structure 13, there is a hinged support 14 arranged to communicate with a feed lip 9, 10 connected to the flexible chamber wall 6a, 6b, 6c, 6d. In this example, only one chamber wall 6b is made thin enough to be flexible wall structure 6 ςτ) comprising a thin chamber wall 6b. As the pressure in the feed chamber 5 rises, the thin chamber wall 6b bends. The arrows in the figure show the direction in which the pressure is applied. As the thin chamber o 6 wall deflects, the support structure 13 and the hinged support 14 act on the lip opening 8 at the end of the nozzle slot 75 5 so that the lip opening 8 remains the same size as before.

jr Although the pattern looks different the nozzle slot 7 is not the same size throughout the distance, but because rv. is normally a narrow opening in the feed chamber 5 and a narrow lip 8 and a co

I'm not in between a small chamber-like part where the coating can even out. The lip cavity 8 is typically about 0.5 to 2.0 mm, preferably about 1.0 mm, and the coating agent is applied as a free jet of the lip cavity 8 to a material web passing the nozzle applicator 2. The coating agent 11 comes out of the lip opening 8 as a coating spray and the jet speed is determined by the flow rate of the lip opening 8 and the coating agent.

Figure 3 shows another example of a nozzle applicator 2 according to the invention. Figure 3 is a conceptual figure which does not show the actual geometry of the nozzle applicator 2. The nozzle applicator 2 comprises a supply chamber 5 surrounded by a chamber 6a, 6b, 6c, 6d and a nozzle slot 7 delimited by the supply lips 9, 10 At least one of the chamber walls 6a, 6b, 6c, 6d is made flexible to accommodate the pressure in the supply chamber 5. At least one of the feed lips 9, 10 communicates with said at least one chamber wall 6a, 6b, 6c, 6d which is arranged to be flexible. The nozzle applicator 2 in this example also comprises a support structure 13 arranged to communicate with the nozzle applicator 2. As part of the support structure 13, a hinged support 14 is provided. The hinged support is arranged to communicate with said flexible lip 9a, 6b, 6c, 6d. one of the chamber walls 6b is made thin enough for it to bend due to the pressure in the feed chamber 5 causing the feed chamber 5 to expand. The second feed lip 10 communicates with the wall structure 6, which comprises a thin chamber wall 6b capable of supplying the feed chamber 5 due to pressure change. As the pressure rises in the feed chamber 5, the thin chamber wall 6b bends. The arrows in the pattern show the direction that the pressure is applying. Due to the pressure, the thin chamber wall 6b tends to deflect, and the pressure also affects the wall structure 6 near the nozzle slot 7 and the surface 10a of one of the feed lips 10, which is mated to communicate with the flexible chamber wall 6b. As the thin chamber wall 6b deflects ςτ), the support structure 13 and the hinged support 14 act on the lip opening 8 oo at the end of the nozzle slot 7 so that the lip opening 8 remains the same size as before. Although the pattern shows otherwise, the nozzle slot 7 is not of the same size throughout the passage, but normally has a narrow opening i 5 to the feed chamber 5 and a narrow lip opening 8 and a small ir chamber-like portion between the two openings. The lip gap 8 is typically about 0.5 to 2.0 mm, preferably about 1.0 mm, and the coating agent is applied as a free jet from the lip 8

Not for the material web passing the nozzle applicator 2. The coating agent comes out of the lip gap 8

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the coating agent jet and the jet speed are determined by the flow rate of the lip opening 8 and the coating agent 30. In Fig. 3, the adjusting means 15 is arranged between the thin chamber wall 6b and the support structure 13. The resilience of the chamber wall 6b is adjustable by placing the adjusting means 15 between the chamber 6b and the support structure 13 such that the height of the adjusting means 15 changes as the resilience of the chamber wall 6b needs to be changed. The adjusting means 15 may, for example, be a pneumatic support that exerts a back pressure on the bending or inclined chamber wall 6b. With the pneumatic support, the elasticity of the at least one chamber wall 6a, 5 6b, 6c, 6d can be adjusted by adjusting the pressure level. The adjusting means 15 may also be a profiling element or a profiling plate arranged to communicate with the thin wall 6b and the supporting structure 13. The adjusting means 15 may also adjust the cross-section of the flexible chamber wall.

It will be apparent to one of skill in the art that as technology advances, the inventive dressing 10 can be implemented in a number of ways. The invention and its embodiments are therefore not limited to the above examples, but may vary within the scope of the claims.

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Claims (13)

A jet nozzle structure (1) comprising a nozzle applicator (2) for spreading a blank, such as a coating, surface adhesive or pigmented adhesive, onto a moving surface, such as a web, roller or belt, wherein the nozzle applicator (2) extends in a transverse direction relative to the surface in motion and wherein the nozzle applicator (2) comprises: an inlet chamber (5) for receiving the blank from a feeder, wherein the inlet chamber (5) is limited by chamber walls (6a, 6b). 6c, 6d), and a nozzle vent (7), which is limited by a feed lip (9, 10) on each side of the nozzle vent (7), wherein the nozzle vent (7) is in flow communication to the inlet chamber (5) in which the blank is arranged to measure from the feeding chamber (5) to the nozzle gap (7), wherein the nozzle gap ends in a lip slot (8) for dispensing the spray-form substance out of the nozzle gap (7) onto the moving surface, and the nozzle applicator (2) further comprises means for compensating for one deformation of the lip slit (8), characterized in that the means for compensating for the deformation of the lip slit (8) comprises at least one of the chamber walls (6a, 6b, 6c, 6d) of the feed chamber (5), which are arranged to be flexible, it can yield according to the pressure in the feed chamber (5). $ 2 2. Jet coating nozzle construction (1) according to claim 1, characterized in that the feeding lip (9, 10) is arranged to close in connection with said at least one chamber chamber (6a, 6b, 6c, 6d), which is arranged to be flexible. o X Jet coating nozzle construction (1) according to any of claims 1-2, 5, characterized in that the means for compensating for the deformation of the lip slot (8) comprises a support structure (13) having at least one rotatably stored support (14). ° 30 arranged in connection with the nozzle applicator (2). 17 Jet coating nozzle structure (1) according to claim 3, characterized in that the at least one pivotally mounted support (14) is arranged to engage in connection with the supply lip (10) which is in communication with the flexible chamber wall (6a, 6b). 6c, 6d). 5 Jet coating nozzle construction (1) according to any of claims 1-4, characterized in that the nozzle structure (1) comprises a support beam (3) for supporting the nozzle applicator (2). Jet jet nozzle structure (1) according to claim 5, characterized in that the nozzle applicator (2) and the support beam (3) are connected by means of control elements (4). 7. Jet coating nozzle construction (1) according to claim 5 or 6, characterized in that the nozzle applicator (2) and the support beam (3) are connected by means of a joint which allows relative movements. Jet coating nozzle construction (1) according to any of claims 3-7, characterized in that a control device (15) is arranged between the at least one flexible chamber wall (6a, 6b, 6c, 6d) and the supporting structure (13). the flexibility of the flexible chamber wall (6a, 6b, 6c, 6d). co 9. Jet coating nozzle construction (1) according to claim 8, characterized in that the CM 2 control means is a pneumatic support element for controlling the flexible area of the at least one chamber wall (6a, 6b, 6c, 6d) by pressure level control. o X IX Jet coating nozzle construction (1) according to claim 8 or 9, characterized in that the cross-section of the flexible chamber wall (6a, 6b, 6c, 6d) is adjustable by means of the LO ° controller (15). o ™ 30 18 A method of spreading a substance, such as a coating agent, a surface glue or a pigmented glue onto a moving surface, comprising: a step of arranging a nozzle applicator (2) adjacent the moving surface, said nozzle applicator (2 ) comprises an inlet chamber (5) and a nozzle gap (7), which is in flow communication with the inlet chamber (5), for feeding the substance from the inlet chamber (5) to the nozzle gap (7), wherein said inlet chamber (5) is limited by chamber walls (5). 6a, 6b, 6c, 6d) and said feed chamber receives blank from a feed device, wherein the nozzle gap (7) is restricted by feed lips (9, 10) and ends in a lip slot (8), a step of feeding the blank from the lip slot (8). ) on the surface in motion, and using means to compensate for deformation of the lip slit (8), characterized in that the means are provided to compensate for the deformation of the lip slit (8) by arranging at least one of the inlets. the walls (6a, 6b, 6c, 6d) of the sealing chamber (5) so that it becomes flexible, so that it gives up due to the pressure in the feed chamber. Method according to claim 11, for spreading a substance, such as a coating seam, a surface glue or a pigmented glue on a moving surface, characterized in that the means for compensating the deformation of the lip slit (8) is provided by further arranging a support structure (13) to support at least one feed lip (9, 10). co g Method according to claim 12, for spreading a blank, such as a coating coating, a surface glue or a pigmented glue on a moving surface, characterized in that the at least one feeding lip (9, 10) is arranged. ) to interconnect with the at least one flexible chamber wall (6a, 6b, 6c, 6d). DC CL Is- co CO LO o o CM