TW201422317A - Acting element, device and method for applying a viscous material layer onto substrate - Google Patents

Abstract

The present invention relates to a device for applying a viscous material layer onto a substrate by using an acting element. The acting element has a plurality of discharge passages terminated in the discharge openings. The aforementioned discharge passages respectively lead to flow resistance acting on the adhesive agent. The device is characterized in that the acting element comprises at least one structure for affecting the flow resistance between the connecting opening of said acting element and the discharge opening of said discharge passage. Also, the device also includes a connecting passage terminated in the connecting opening, and the discharge passage has a flow connection with said connecting passage through a connection room.

Description

Actuating element, device and method for applying a layer of viscous material to a substrate Technical field

The invention relates to an active element/applying element/applying element, device and method for applying a layer of adhesive material to a substrate, in particular for applying a layer of adhesive material or an optical adhesive to a glass or plastic The method of forming a flat surface. Furthermore, the invention relates to a blank.

Background technique

For example, in the manufacture of an indicator system, a flat layer of adhesive is typically applied to a substrate made of glass or plastic. The difficulty here is to achieve the desired accuracy in terms of the size of the adhesive layer.

Summary of invention

Accordingly, it is an object of the present invention to improve the active elements, devices and methods for applying a layer of viscous material to a substrate.

This object is achieved by the features described in claims 1, 9, and 10.

The core of the invention consists in applying a (material) layer using a wide nozzle having a plurality of discharge channels, the discharge channels having discharge openings. Here, the nozzle includes at least one construction/technical hand that affects the flow By means of the configuration, the pressure of the material to be applied in the region of the discharge opening can be influenced in a targeted manner.

The structure that affects the flow is, in particular, a configuration for influencing the flow resistance of the discharge passage. In particular, the specific geometry of the discharge channel can be matched and varied over the width of the nozzle, in particular the targeted matching of the length and/or the cross section of the discharge channel over the width of the nozzle. Alternatively or additionally, one or more flow-influencing configurations may be arranged in the region upstream of the discharge channel, in particular in the front chamber adjacent the discharge channel inside the nozzle.

In particular, it is possible to achieve a defined pressure distribution in the region of the outlet opening by the flow resistance between the connection opening of the nozzle and the discharge opening. In particular, it can be achieved that the pressure distribution is constant over the entire width of the nozzle. Thereby a uniform discharge of the viscous material is achieved over the width of the nozzle. Thereby the accuracy of the layer to be applied to the substrate can be improved.

According to one aspect of the invention, the discharge openings of the nozzles are so closely adjacent, that is, a separate beam of material to be applied emerging from the discharge opening after it exits the nozzle - however, especially before being applied to the substrate -- Convergence. In other words, the material flows in a continuous beam of material, in particular a waterfall or a curtain-shaped beam, onto the substrate. This also improves the uniformity of the thickness of the layer to be applied.

Due to the presence of a plurality of discharge channels, the discharge of the material to be applied over the entire width of the nozzle can be influenced extremely accurately and/or flexibly. In particular, the application of a layer of uniform thickness is achieved and significantly improved.

When applied to the substrate, the layer to be applied is especially horizontal Towards, that is to say over the width B of the nozzle, has a uniform or at least substantially uniform thickness. The deviation from the average layer thickness, which is determined in the transverse direction, is in particular at most 10%, in particular at most 1%, in particular at most 0.1%. Thus, the layer can be applied to the substrate with high precision using the method according to the invention.

After the application, the layer has a thickness in the range from 0.03 mm to 3 mm, in particular in the range from 0.05 mm to 1 mm, in particular in the range from 0.1 mm to 0.5 mm. In particular, an extremely thin layer can be applied to the substrate by means of the method according to the invention.

According to one aspect of the method, the layer has a predetermined thickness in the region between the nozzle of the metering unit and the substrate when the material is applied to the substrate. The layer thickness decreases to zero over the entire width of the nozzle in a direction perpendicular to the lateral direction toward one side, while the thickness of the layer is substantially constant in the opposite direction. Thus, the layer has at least as uniform a thickness as possible after application, ie a layer thickness which is exactly the desired. In particular, the corrugations of the applied material that are pushed out in front of the nozzle when the material is applied are not formed. This improves the accuracy of the layer thickness.

The number of discharge openings is at least 10, in particular at least 30, in particular at least 50. The discharge openings are arranged in particular at regular intervals, that is to say are arranged equidistant from one another. The accuracy can be further improved by a large number of discharge openings. The number of outlet openings can be up to 100, in particular up to 200, in particular up to 300, in particular up to 500, in particular up to 1000, in particular up to 2000, in particular up to 3000, in particular up to 5000, in particular up to 10,000. In principle the quantity can be even larger. In principle, the number of discharge openings is related to the width of the nozzle. The linear density of the discharge opening is in particular in the range from 0.1 mm ^-1 to 10 mm ^-1 , in particular in the range from 0.3 mm ^-1 to 3 mm ^-1 .

The width of the nozzle, that is to say its extension in the transverse direction, and the corresponding number of discharge openings can preferably match the width of the substrate to be coated. For this purpose, the nozzle is advantageously replaceable.

The discharge channel has a flow cross section in the range from 0.05 mm ² to 1 mm ² , in particular in the range from 0.1 mm ² to 0.3 mm ² . It is especially designed as a capillary tube. Its diameter matches, in particular, the viscosity of the material used as the coating. In particular, the discharge channel is designed such that when it is loaded by the coating material, there is a substantially uniform pressure throughout the length of the discharge channel.

The pressure present in the discharge channel, in particular in the region of the discharge opening, can be controlled by means of a metering unit. The pressure is in particular in the range from 0.15 MPa to 2 MPa, in particular in the range from 0.2 MPa to 1 MPa.

According to another aspect of the invention, the nozzle moves in a direction of movement relative to the substrate as the material is applied. The nozzle moves in particular at a predetermined speed. The direction of movement is in particular oblique, preferably perpendicular to the transverse direction.

In particular, depending on the viscosity of the coating material and the desired layer thickness, the speed of the relative movement between the nozzle and the substrate is selected such that when the material is applied to the substrate, the layer thickness is monotonous in the direction of movement from the region between the nozzle and the substrate. The ground is reduced to zero. In particular, no material ripples are produced in the region before the nozzle in the direction of movement. This also improves the accuracy in terms of the thickness of the layer to be applied.

In particular, the nozzles are designed such that all discharge openings are in one plane. They are especially arranged along a straight line. In addition, the nozzles are arranged in this way, That is, the plane of the discharge opening extends parallel to the surface of the substrate to be coated. Therefore, all of the discharge openings have the same spacing from the substrate.

Advantageously, at least one limiting dam (Begrenzungs-Damm) can be applied to the substrate before the application of the material. In particular for larger layer thicknesses, in particular when the layer thickness is greater than 0.5 mm, in particular greater than 1 mm, in particular greater than 3 mm, it is advantageous to limit the dam. When the layer thickness is small, in particular when the layer thickness is less than 1 mm, in particular less than 0.5 mm, in particular less than 0.3 mm, in particular less than 0.1 mm, the limiting dam can also be omitted. In principle, it is applicable that the greater the viscosity of the coating material to be applied, the thicker the layer can be applied without limiting the dam. By limiting the dam, the area to be coated can be restricted, in particular in the lateral direction, that is to say perpendicular to the transverse direction, and preferably also parallel to the transverse direction. In this case, the limiting dam preferably has a defined size, in particular a predetermined cross section, in particular a predetermined height. The height of the limiting dam is at least as large as the thickness of the layer to be applied. In principle, the limiting dam can also have a smaller height than the layer to be applied. The dam is preferably as precise as the layer to be applied.

The layer to be applied is in particular a layer of adhesive. In particular, the binder has a refractive index which matches the component to be bonded.

The material to be applied has in particular a range from 1 mPas to 10 ⁴ mPas, in particular in the range from 300 mPas to 3000 mPas, in particular in the range from 500 mPas to 2000 mPas, in particular in the range from 800 mPas to 1200 mPas. Sticky.

With the device according to the invention it is achieved that the layer is applied to the substrate in a particularly precise manner. In particular, it is achieved that a layer of a predetermined size, in particular a layer having a predetermined thickness, is applied to the substrate with great precision.

Another object of the invention is to improve the blank for the multilayer-indicator. This object is achieved by the features described in claim 15.

The advantages of this blank correspond to the above description.

1‧‧‧Measuring device

2‧‧‧Adhesive materials

3‧‧‧Base

4‧‧‧Measuring unit

5‧‧‧Action elements/nozzles

6‧‧‧Connected channel

7‧‧‧Connecting opening

8‧‧‧Filter

9‧‧‧Transition room

10‧‧‧Draining opening

11‧‧‧Drainage channel

12‧‧‧Nozzle head

13‧‧‧ Positioning equipment

14 ‧ ‧ layer

15‧‧‧Surface structure

16‧‧‧Cleaning pieces

17‧‧‧Restricted dam

20‧‧‧Connection room/exhaust front room

21‧‧‧ base

22‧‧‧Seal

23‧‧‧Border edge

24‧‧‧ bolt

25‧‧‧ components

26‧‧‧ thread

27‧‧‧ moving direction

28‧‧‧Envelope

p _a ‧ ‧ pressure

B‧‧‧Width

L, l _m , l _r ‧‧‧ length

D‧‧‧thickness

p ⁺ ‧‧‧Overpressure

p ^- ‧‧‧ low pressure / negative pressure

Further advantages, features and details of the invention result from the description of the embodiments in accordance with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows a device for applying an adhesive on a substrate according to an embodiment of the invention, and FIG. 2 schematically shows application according to a method not according to the invention. In the cross section of the layer on the substrate, FIG. 3 schematically shows a cross section of the layer applied to the substrate at the point in time of application, and FIG. 4 schematically shows the application to the substrate at a later point in time. Cross section of the layer, FIG. 5 shows the active element for applying the adhesive on the substrate according to the invention in a front view, FIG. 6 shows the active element according to FIG. 5 in a perspective view, FIG. Line VII-VII shows the active element according to Fig. 5, Fig. 8 shows a partial enlarged view of the area VIII of Fig. 7, and Fig. 9 shows the base body of the active element according to Fig. 5, Figs. 10 to 13 along the line XX, XI-XI, XII-XII and XIII-XIII show the substrate according to Fig. 9, Fig. 14 shows a partial enlarged view of the area XIV, and Fig. 15 shows the discharge passage of the nozzle in the view according to Fig. 9. Other details, Fig. 16 schematically shows an exemplary result of a simulation method for simulating a pressure distribution in a binder in a region of a discharge opening of a nozzle, and Fig. 17 is another nozzle according to Fig. 5 As shown, the nozzle has a matched distribution of the length of the discharge passage.

detailed description

First, a metering device 1 for metering the adhesive 2 onto a substrate 3, such as a glass plate or a plastic plate, in particular a liquid crystal display (LCD), is described.

The metering device 1 comprises a metering unit 4 for meteredly providing a binder 2 . The metering unit 4 is only shown schematically in the figures. The metering unit comprises a container for the adhesive 2, a pressure generating element for generating a predetermined pressure, and a control device for controlling the pressure.

The metering unit 4 is connected in a flow-through manner to an active element designed as a nozzle 5 for guiding the adhesive 2 to the substrate 3 . For this purpose, the nozzle 5 has a connecting channel 6 which terminates in the connecting opening 7 on the side facing the metering unit 4 . By means of the metering unit 4, the connecting channel 6 of the nozzle 5 can be loaded with a binder 2 having a predetermined pressure p ₀ . The pressure p ₀ in the adhesive 2 in the region of the connection opening 7 in the region of the nozzle 5 is in particular in the range from 150 kPa to 300 kPa.

The metering unit 4 is in particular an automatic meter.

Preferably, a filter 8 can be arranged in the connection from the metering unit 4 to the nozzle 5, in particular in the region of the connection opening 7.

The metering unit 4 is connected to the transition chamber 9 via a connecting channel 6. The transition chamber 9 is completely arranged in the interior of the nozzle 5. The transition chamber 9 can in particular be arranged at an angle relative to the connecting channel 6. In the embodiment shown in Figure 6, the transition chamber 9 forms an angle of about 30 with the connecting passage 6. The angle between the transition chamber 9 and the connecting channel 6 is generally in the range from 0° to 60°, in particular in the range from 10° to 45°, in particular in the range from 15° to 35°.

The transition chamber 9 opens into a discharge front chamber 20 on the side where its reverse connection passage 6 is provided.

The discharge front chamber 20 opens into a plurality of discharge passages 11 on the outlet side. Therefore, the discharge front chamber 20 forms a connection chamber for connecting the passage 6 or the connection of the transition chamber 9 to the discharge passage 11. The discharge channels 11 each have a discharge opening 10 on the outlet side. The discharge channel 11 is designed such that it has a uniform pressure p _a in the adhesive 2 in the discharge channel. In particular, the discharge channel is embodied as a capillary tube, that is to say with a small cross section. The discharge passage 11 will be explained in more detail below.

The discharge front chamber 20 is completely covered by the cover member 16.

The discharge front chamber 20 preferably has a volume that is as small as possible. This avoids the accumulation of a larger amount of adhesive 2 in the nozzle 5. The volume of the discharge front chamber 20 is in particular less than 100 ml, in particular less than 30 ml, in particular less than 10 ml.

The discharge front chamber 20 has a width that increases in the flow direction, that is, from the transition chamber 9 to the discharge passage 11 . In order to at least partially compensate for the increase in the flow cross section associated therewith, the discharge front chamber 20 may have a reduced depth in the direction of flow, that is to say a reduced free width. It is possible here that the discharge front chamber 20 is designed to have a constant depth over the width of the nozzle 5 . However, it is also possible to design the discharge front chamber 20 to have a width in the width of the nozzle 5. The depth of the. This can affect the flow resistance in the discharge front chamber 20. In other words, the geometric design of the discharge front chamber 20, in particular the bottom wall of the base body 21 of the nozzle 5 adjoining the discharge front chamber 20, forms a connection opening 7 and a discharge channel for influencing the nozzle 5. The construction of the flow resistance between 11. It is especially possible that the discharge front chamber 20 is designed to have a contoured structure in a region directly adjacent to the discharge passage 11. In this case, it can be provided that the discharge front chamber 20 has a lower free height in the central region of the nozzle 5 than in the edge region. The discharge front chamber 20 can in particular have a cross section which is designed to be concave at least on one side. The cross section of the discharge front chamber 20 can be, in particular, flat-concave or concave-concave. The shape of the recessed cutout can preferably be described by a conical curve, in particular by an ellipse or a parabola.

It has in particular a cross section which is constant over its length l. The cross section is preferably at most 0.3 mm ² , in particular at most 0.15 mm ² . The cross sections of the individual discharge channels 11 are in particular identical, that is to say different discharge channels have the same cross section.

However, the discharge passages 11 have different lengths l. For example, as in FIG. 9 can be seen, the discharge channel 5 in the central region of the nozzle 11 has a length l _m, in the edge region of the discharge passage 11 in the nozzle 5 with _{R & lt} length l, a length greater than the length l _m l _r . In the embodiment shown in Figure 9, the ratio l _m :l _r is about 2, which is generally in the range of 1.1 to 3, especially in the range of 1.5 to 2.5. The distribution of the length l of the discharge channel 11 over the width B of the nozzle 5 can be described by a conic curve, in particular by an ellipse or a parabola.

The flow resistance can be influenced by the length l of the discharge passage 11. Have a better The discharge passage 11 of the large length l has a larger flow resistance of the binder 2 than the discharge passage 11 having a smaller length l. Therefore, the length l of the discharge passage 11 forms a configuration that affects the flow, particularly a configuration for influencing the flow resistance. It has been recognized in accordance with the present invention that the pressure distribution of the adhesive 2 in the region of the discharge opening 10 can be affected by appropriately varying the length l of the discharge passage 11 over the width B of the nozzle 5. In particular, it is possible to select the distribution of the length l of the discharge channel 11 such that the pressure in the adhesive 2 is the same in the region of the entire discharge opening 10 . This allows a uniform outflow of the adhesive.

As an alternative and/or additional configuration for influencing the flow resistance of the discharge passage 11, the discharge passage 11 can be made to have a different cross section. It is especially possible to have all discharge channels 11 having the same length l with different cross sections. In this case, the cross section of the discharge passage 11 in the central region of the nozzle 5 is smaller than the cross section of the discharge passage 11 in the region of both sides of the nozzle 5.

It is furthermore possible to influence the flow resistance by matching the discharge front chamber 20 in the region adjacent to the discharge channel 11. In other words, the free width of the discharge front chamber 20, that is, the cross section, forms a configuration for influencing the flow resistance. Finally, it is also possible to arrange a separate flow-influencing configuration in the discharge front chamber 20, in particular in the region adjacent to the discharge channel 11. For example, a porous structure can be envisaged by which the flow resistance can be influenced. Such a structure can be arranged in the discharge front chamber 20, in particular in a replaceable manner.

Of course, any combination of the aforementioned configurations that affect flow is possible.

It is also possible to design the discharge channel 11 to have a cross section which varies over its length l. This also affects the flow properties of the adhesive 2, in particular the flow resistance of the discharge channel 11.

The discharge channel 11 has in particular a flow cross section in the range from 0.05 mm ² to 1 mm ² , in particular in the range from 0.1 mm ² to 0.3 mm ² .

According to the invention, different nozzles 5 having different sized discharge channels 11 are provided for the different viscous adhesives 2. In particular, the nozzle 5 is connected to the metering unit 4 in a manner that can be easily replaced.

The number of discharge openings 10 is at least 10, in particular at least 30, in particular at least 50. It can be in particular more than 100, in particular more than 200.

The discharge openings 10 are preferably arranged equidistantly from one another. It is in particular arranged in a distance d in the range from 0.3 mm to 1 cm, in particular in the range from 0.5 mm to 2 mm. They are arranged in particular along a straight line. It preferably has a rectangular shape, in particular a square or a circular shape, in particular a circular shape.

The substrate 3 and the nozzles 5 are designed in particular and arranged relative to each other, ie all discharge openings 10 are spaced apart from the substrate 3 by the same distance when the adhesive 2 is applied to the substrate 3. When the adhesive 2 is applied to the substrate 3, the spacing of the discharge opening 10 to the substrate 3 is in particular slightly greater than the layer thickness to be achieved. When the adhesive 2 is applied to the substrate 3, the distance of the discharge opening 10 from the substrate 3 is in particular 0.01 mm to 1 mm larger than the desired layer thickness, in particular from 0.05 mm to 0.5 mm, in particular from 0.08 mm to 0.12 mm. . When the adhesive 2 is applied to the substrate 3, the ratio of the distance (from the layer thickness) of the discharge opening 10 from the substrate 3 is, in particular, at most 2, in particular at most 1.1, in particular at most 1.01, in particular at most It is 1.001.

For example, the nozzle 5 is made of plastic, aluminum or stainless steel. The nozzle 5 can have a treated surface. It can in particular be raised or have a contoured structure. It has in particular a predetermined surface roughness. This can also be shadowed The flow characteristics of the adhesive 2. In particular, it can be computer controlled milling (CNC-gefraest). It has a base body 21 with a cover member 16 threadedly connected thereto. This in particular simplifies the cleaning of the nozzle 5 , in particular the cleaning of the discharge channel 11 . Furthermore, the manufacture of the nozzle 5 is thereby simplified.

A seal 22 is disposed between the cover member 16 and the base body 21. The seal 22 is designed as a planar layer. It matches the shape of the cover member 16. In particular, the sealing element 22 bears against the cover element 16 over its entire surface. As an alternative, it is possible for the sealing element 22 to be arranged in the region of the circumferential side, that is to say in the region of the boundary edge 23 of the base body 21 , along the boundary edge of the front portion of the nozzle 5 only in one week. Undesirable lateral overflow of the adhesive 2 can be prevented by means of the seal 22. In particular, it can be ensured by means of the seal 22 that the adhesive 2 is only discharged from the discharge opening 10 of the nozzle 5 .

In particular, the cover 16 is screwed to the boundary edge 23 of the base body 21 by means of a plurality of bolts 24 . Furthermore, it can be provided that the cover 16 is screwed by a plurality of bolts 24 arranged in a row parallel to the discharge opening 10 . This improves the mechanical stability of the nozzle 5, in particular the cover member 16.

In order to improve the mechanical stability and to influence the flow characteristics of the adhesive 2 in the discharge front chamber 20, an island-like member 25 is provided in a region where the bolt for tightening the cover member 16 and the base 21 passes through the discharge front chamber 20. The island-shaped element 25 has a lenticular cross section. This makes it possible to effectively avoid the formation of eddy currents. Threads 26 for receiving the bolts 24 are respectively arranged in the island-like elements 25.

The nozzle 5 in particular has a nozzle head 12 which has a trapezoidal cross section. It has a range of from 1 cm to 100 cm in the transverse direction, especially at 2 cm to A width B in the range of 50 cm, especially in the range of 4 cm to 25 cm.

The nozzle 5 can be positioned relative to the substrate 3 by means of a positioning device 13 which is only shown schematically in the figures. It is especially movable relative to the substrate 3. The nozzle 5 can be moved relative to the base 3, in particular in the direction of movement 27, by means of the positioning device 13. The direction of movement 27 is in particular transverse to - preferably perpendicular to the transverse direction of the nozzle 5 . The positioning device 13 can preferably have a control unit by means of which the positioning of the nozzle 5 relative to the substrate 3 can be controlled, in particular the distance and/or the speed of movement of the nozzle 5 from the substrate 3.

A method for applying the adhesive 2 layer 14 on the substrate 3 is described below. Adhesive 2 is a special example of a viscous material. The method is generally used to apply a layer of adhesive material 14 to the substrate 3. The metering device 1 described above is first provided together with the adhesive 2 and the substrate 3. A predetermined amount of adhesive 2 is then applied to the substrate 3 by means of the metering device 1. Here, the adhesive is discharged from the discharge opening 10 of the nozzle 5 in a plurality of individual beams. The number of beams is in particular exactly the same as the number of discharge openings 10 of the nozzle 5. The dimensions, in particular the flow cross section of the outlet channel 1 , in particular the distance d of the outlet opening 10 and, in particular, the adjacent outlet opening 10 , the viscosity of the adhesive 2 and/or the metering unit 4 The pressure p ₀ matches: that is, the beams discharged from the separate discharge openings 10 have merged before being discharged to the substrate 3. The beam has merged into a unique, continuous curtain-type material beam, in particular before it hits the substrate 3.

Therefore, the adhesive 2 already has a uniform or at least as uniform thickness as possible over the entire width B of the nozzle 5 when applied to the substrate 3. The deviation of the thickness D in the transverse direction is, in particular, at most 10% of the average thickness of the layer 14, in particular The maximum is 1% of the average thickness of layer 14, especially at most 0.1% of the average thickness of layer 14. When applied to the substrate 3, the adhesive 2 has as uniform a surface structure 15 as possible, which at most has only a very small ripple. The surface structure 15 present at most when applied to the substrate 3 is further compensated in the sink-time T.

In particular, by means of the nozzle 5 according to the invention, the adhesive 2 is applied uniformly over the substrate 3 over the entire width B of the nozzle 5 . In contrast to the solution exemplarily shown in Fig. 2, in which the adhesive is applied to a substrate in a separate beam, this results in an improvement in accuracy. Furthermore, contrary to the solution exemplarily shown in FIG. 2, which is not according to the invention, the flow resistance which is designed according to the invention for influencing the connection opening 7 of the nozzle 5 and the discharge opening 10 of the discharge channel 11 The configuration achieves that the same amount of adhesive 2 is discharged from all of the discharge openings 10 of the nozzle 5.

The confluence-time T is related to the viscosity of the binder 2. It is preferably in the range of 1 second to 20 seconds, especially in the range of 3 seconds to 10 seconds. In any event, the confluence-time T is significantly shorter than the time required for the adhesive 2 to harden. It is less than or equal to 1/10 of the time required for the adhesive 2 to harden, especially less than or equal to 1/50 of the time.

When the adhesive 2 is applied to the substrate 3, the metering unit 4 is controlled such that the binder 2 is discharged from the discharge opening 10 of the nozzle 5 at _a predetermined pressure p _a . The pressure p _{a is} smaller than the pressure p ₀ in the region of the connection opening 7. Especially suitable is p _a :p ₀ 1:1.5, especially p _a :p ₀ 1:2, especially p _a :p ₀ 1:3, especially p _a :p ₀ 1:5. The pressure p _{a is} especially in the range of 100 kPa to 200 kPa.

In order to apply the adhesive 2 to the substrate 3, the nozzle 5 is by means of a positioning device 13 moves in the direction of movement 27 relative to the substrate 3. The nozzle 5 is moved in particular along a predetermined track, in particular obliquely, preferably perpendicularly to the nozzle 5. The nozzle 5 moves, in particular, along the direction of movement 27 at a predetermined speed. In particular, it can be avoided that the corrugations are formed by the adhesive in the region before the nozzle 5 in the direction of movement 27. In particular, the layer 14 has a monotonically decreasing thickness D in the direction of movement 27 starting from the nozzle 5 . The thickness D of the layer 14 decreases monotonically in the direction of movement 27 from the nozzle 5, in particular over the entire width B of the nozzle 5, in particular up to zero.

Application of at least one restriction dam 17 to the substrate 3 can be designed prior to applying the adhesive 2 to the substrate 3. By means of the restriction dam 17, it is possible to precisely predetermine the area where the adhesive 2 should be applied to the substrate 3. The restriction dam 17 can limit this area, in particular on the end side, that is to say on the side and/or at the front and rear ends, preferably circumferentially. For details of the restriction dam 17 and its application to the substrate 3, see DE 10 2011 005 379 and DE 10 2011 005 380.

The substrate 3 with the adhesive 2 layer 14 is used in particular as a blank for the manufacture of multilayer indicators.

In general, the layer 14 having a uniform thickness D can be applied to the substrate 3 with great precision using the method according to the invention. Subsequently, another substrate 3 can be applied to this layer 14. The substrate can be, for example, a glass substrate or a plastic substrate for the covering member. Indicators such as a display or a touch panel may also be involved. In particular for the connection of any such substrate, the method according to the invention is advantageous. This method is advantageous especially for applications where high precision is important. In particular, optical applications, especially the manufacture of screens, fall into this category.

The details and advantageous implementation of the nozzle 5 are described below with reference to Figures 15 to 17 Scheme.

The embodiment of the nozzle tip 12 shown in Figure 15 corresponds to the embodiment shown in Figure 9, with reference to the description of the embodiment shown in Figure 9.

As already described above, the discharge passage 11 has a length l _m in the central region of the nozzle 5, l _m is greater than the length of the discharge passage 11 in the edge region of the length l _r of the nozzle 5. In other words, the discharge passage 11 has a length l which consists of a constant portion _lr and a portion Δl which varies in the width B of the nozzle. Here, as exemplarily shown in FIG. 15, the length of the portion Δ1 varying over the width B of the nozzle 5 can be described by the envelope of the ellipse.

This distribution of the length of the discharge channel 11 over the width B of the nozzle 5 is also referred to simply as an elliptical distribution or a length change corresponding to a conic curve, in particular to an ellipse.

The elliptical envelope 28 has in particular a first partial axis ha ₁ which extends parallel to the row of discharge openings 10 . The length ha _{1 of the} first half shaft can in particular be exactly equal to half the width B of the nozzle 5: ha ₁ = B/2.

Furthermore, the envelope 28 of the ellipse can be described by the length ha _{2 of the} second half shaft. The second partial axis ha ₂ is in particular parallel to the longitudinal orientation of the discharge channel 11. Its length corresponds in particular to the difference between the length l _m of the discharge channel 11 in the central region of the nozzle 5 and the length l _r of the discharge channel 11 in the edge region of the nozzle 5: ha ₂ =l _m -l _r . It is also possible to select that the length ha _{1 of the} first half shaft is greater than half the width B of the nozzle 5. Especially suitable for: B/2 Ha ₁ 5B, especially B/2 Ha ₁ 3B, especially B/2 Ha ₁ B, especially B/2 Ha ₁ 0.7B. Correspondingly, the length ha _{2 of the} second partial shaft can also be selected separately. Especially suitable: 0.01 (l _m -l _r ) Ha ₂ 10(l _m -l _r ), especially 0.3(l _m -l _r ) Ha ₂ 3(l _m -l _r ), especially 0.5(l _m -l _r ) Ha ₂ 2(l _m -l _r ), especially 0.8(l _m -l _r ) Ha ₂ 1.2 (l _m -l _r ).

It has been found according to the invention that the pressure drop in the side regions of the nozzle 5 can be compensated for by the distribution or variation of such an ellipse of the length l of the discharge channel 11 over the width B of the nozzle 5. This length matching of the discharge channel 11 on the width B of the nozzle 5 makes it possible in particular to ensure that the pressure distribution of the adhesive 2 to be applied in the region of the discharge opening 10 of the nozzle 5 is constant. The adhesive 2 is discharged from the discharge opening of the nozzle 5, in particular, at a constant pressure.

It has also been generally found that the wider the nozzle 5, the greater the length ha _{2 of} the second half shaft must be selected. The width B of the nozzle 5 is in particular in the range from 1 cm to 300 cm, in particular in the range from 3 cm to 100 cm, in particular in the range from 10 cm to 30 cm.

Furthermore, it has been found that although in the embodiment shown in FIG. 15 the pressure distribution in the adhesive 2 in the region of the discharge opening 10 of the nozzle 5 is substantially uniform, in particular constant, for a particular application. Still can be further improved. In order to optimize the length distribution of the discharge channel 11 over the width B of the nozzle 5, a simulation method is especially designed. In this simulation method, the specific geometrical properties of the adhesive 2 under pre-specified conditions, in particular at a predetermined temperature, and the substrate 21, in particular the discharge front chamber 20, can be considered.

This simulation is used in particular for determining the pressure distribution in the adhesive 2 in the region of the discharge opening 10 of the discharge channel 11 or the pressure distribution in the adhesive 2 in the region immediately adjacent to the outside of the nozzle 5. As exemplarily shown in Fig. 16, the deviation of the actual pressure distribution 29 from the ideal, isobaric pressure distribution 30 can be ascertained by means of such a simulation. As exemplarily shown in Fig. 16, for example, this analogy can give an insight that the length distribution of the discharge passage 11 at the width B of the nozzle 5 shown in Fig. 15 results in the middle of the nozzle 5. The relative overpressure p ⁺ in the region and the relative negative pressure p ^- in the side regions of the nozzle 5. In this case, as exemplarily shown in FIG. 17, the length distribution of the discharge channel 11 over the width B of the nozzle 5 can be matched starting from the contour of the ellipse according to FIG. For this purpose, the length l of the discharge channel 11 in the region of the overpressure p ⁺ can be amplified. The length l of the discharge passage 11 in the region of the low pressure p ^- can be shortened. The matching of the length l of the discharge channel 11 by the distribution shown in Fig. 15 is in particular in the range of a maximum of several millimeters. In particular, it is at most 5 mm, in particular at most 3 mm, in particular at most 1 mm. It can be a minimum of 0.1 mm, in particular a minimum of 0.2 mm, in particular a minimum of 0.3 mm, in particular a minimum of 0.5 mm.

9‧‧‧Transition room

11‧‧‧Drainage channel

20‧‧‧Connection room/exhaust front room

21‧‧‧ base

23‧‧‧Border edge

24‧‧‧ bolt

25‧‧‧ components

26‧‧‧ thread

B‧‧‧Width

L, l _m , l _r ‧‧‧ length

Claims (15)

An action element for applying a viscous material to a substrate, comprising: a. at least one connection channel terminating in the connection opening, b. a plurality of discharge channels terminating in the discharge opening, the discharge passage passing through the connection chamber Flow connection with the connecting channel, c. a flow resistance acting on the viscous material in the region between the connection opening and each of the discharge openings, d. characterized in that the active element comprises a pair of active elements At least one configuration in which the flow resistance between the connection opening and the discharge opening of the discharge passage affects. The action element according to claim 1, characterized in that the at least one configuration for influencing the flow resistance between the connection opening of the action element and the discharge opening of the discharge channel is designed such that when discharged from the discharge opening when there is a pressure p _a viscous material in the same region of the pressure p _a at different discharge openings in pairs. The active element according to any of the preceding claims, characterized in that the at least one configuration for influencing the flow resistance between the connection opening of the active element and the discharge opening of the discharge channel is selected from the list below : a length of the discharge channel that varies over the width of the active element, a cross section of the discharge channel that varies over the width of the active element, a cross section of the connection chamber that varies across the width of the active element, and a separate configuration that affects the flow in the connection chamber Arrangement and a combination of these alternatives. The active element according to any of the preceding claims, characterized in The length of the discharge channel varies corresponding to the conic curve over the width of the active element. The active element according to any of the preceding claims, characterized in that the active element has a base body and a cover member threadedly connected to the base body. The active element according to claim 5, characterized in that the discharge channel is milled in the basic body. The active element according to any of the preceding claims, characterized in that the number of discharge channels is at least 10, in particular at least 30, in particular at least 50. The active element according to any of the preceding claims, characterized in that the discharge channel has a flow in the range of 0.05 mm ² to 1 mm ² , in particular in the range of 0.1 mm ² to 0.3 mm ² Cross section. A device for applying a viscous material to a substrate, comprising: a. at least one metering unit for meteringly providing a viscous material, and b. at least one for guiding the viscous material to a substrate to be coated The active element according to any of the preceding claims. A method for applying a layer of viscous material to a substrate, comprising the steps of: a. providing a substrate to be coated, b. providing a device according to claim 9, c. by means of said device The material to be applied is applied to the substrate (3), d. wherein the material is discharged from the different discharge openings with a predetermined pressure distribution. The method of claim 10, characterized in that the material is discharged from all of the discharge openings at the same pressure p _a . A method according to any one of claims 9 to 10, characterized in that the material is discharged from the discharge opening in a separate beam which merges into a continuous beam before striking onto the substrate. The method according to any one of claims 10 to 12, characterized in that when the material is applied to the substrate, the layer has a uniformity in the transverse direction in the region between the active element and the substrate, the highest fluctuation 10% thickness. The method according to any one of claims 10 to 13, characterized in that, when applied to the substrate, the thickness of the layer is monotonically reduced from the active element in the direction of movement and/or from the active element. Starting to reverse the direction of movement is constant. A blank, in particular a blank for an indicator, comprising: a. a substrate, b. a layer of adhesive disposed on the substrate, c. said layer being by means of any one of claims 10 to 14 The method described is applied to a substrate.