JPS6216143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of applying a foaming liquid, and more specifically, the present invention relates to a method of applying a foaming liquid to a long base material such as cloth, paper, or film using a rotary screen. It relates to a method for applying the coating well and uniformly over the entire surface.

Fabrics and other base materials can be softened, shrink-proofed,
Demand for foam processing is increasing in order to perform wrinkle-proofing, water repellency, waterproofing, and other treatments. In this foam processing, air bubbles are evenly dispersed in the processing liquid,
By using this foam as a medium, the amount of coating applied to the substrate can be controlled to a minute amount, thereby ensuring the quality of processed products and saving resources and energy. As a coating device for this foam processing, a device using a rotary screen is widely used, and in this case, the foaming liquid for treatment is converted into a drain (defoaming liquid) at the contact point between the mesh of the rotary screen and the doctor blade. , the coating is performed by exuding onto the surface of the base material.

However, the known rotary screen coating method still has many problems in terms of uniform coating on the substrate surface and fine and precise adjustment of the coating amount. That is, the first problem is that the foaming liquid has poor fluidity compared to normal liquids, so even if it flows in some areas, it may stagnate in other areas. This means that it is difficult to uniformly distribute and supply the foaming liquid over the entire width of the position where the base material and the base material contact each other via the rotary screen. To explain more specifically, even if there is sufficient foaming liquid near the doctor blade, the application operation will be difficult unless this foaming liquid is pushed into the contact position between the doctor blade and the rotary screen by some external force. That's what it means. Thus, it can also be seen that a second problem is uniformly applying the foaming liquid to the substrate.

As a rotary screen applicator that can be used for such foam processing, Japanese Patent Application Laid-open No. 82048/1983 discloses a rotary screen with a closing device located at the end of a printing member (doctor member) and on the upstream side of the printing member. A device is disclosed in which a passage gap is formed between the strip and the gap is laterally sealed at both ends.
According to this device, the advantage is achieved that the foaming liquid is guided through the passage to the contact position between the printing member and the screen mesh surface, and is prevented from coming into contact with the screen mesh surface at other positions. However, it is still unsatisfactory for the purpose of equalizing the coating amount over the entire width of the substrate.

An object of the present invention is to provide a method for uniformly applying a foaming liquid over the entire surface with high precision through a rotary screen.

According to the present invention, in a method of applying a foaming liquid to a long base material such as cloth, paper, or film through a rotary screen, the delivery side surface of the rotary screen is regulated by a scale within the rotary screen, and A guide for the foaming liquid that opens from approximately the center of the rotary screen to the mesh surface of the rotary screen is disposed over the entire effective surface of the rotary screen, and during the guide, an amount of foaming liquid that is larger than the applied amount is provided. Supplying a foaming liquid, sucking the foaming liquid being guided at both side edges of the guide, and causing the foaming liquid to flow toward the mesh surface of the rotary screen and also in the width direction of the rotary screen during the guidance. A method for applying a foaming liquid is provided.

In the present invention, an amount of foaming liquid larger than the amount applied to the foaming liquid guide provided in the rotary screen,
That is, by supplying excess foaming liquid, and by sucking the foaming liquid being guided at both side edges of this guide, the foaming liquid is made to flow toward the mesh surface, and also actively in the width direction toward the rotary screen. Fluidization is a notable difference from conventional methods.

As already pointed out, unlike ordinary liquids, foaming liquids have poor fluidity and tend to stagnate unless measures are taken to actively make them flow. In particular, when the foaming liquid is supplied to the foaming liquid guide in the rotary screen and is made to flow toward the mesh surface of the rotary screen, the foaming liquid tends to stagnate in the areas close to both side edges of this guide, thus causing the foaming liquid to become covered. The amount of coating tends to be considerably smaller in areas close to the edges (edges) of the coated substrate than in the central area.

In the present invention, first, a foaming liquid is supplied in an amount larger than the coating amount to the foaming liquid guide inside the rotary screen, and the foaming liquid is sucked at both side edges of this guide, so that the foaming liquid is applied to both sides of the guide. In addition to preventing stagnation, the foaming liquid being guided is actively given a flow in the width direction of the screen, which allows the foaming liquid to be accurately and uniformly applied to the substrate to be coated over the entire surface. The advantage of being possible is achieved.

The present invention will be described in detail below based on specific examples shown in the accompanying drawings.

In Figure 1, base material 1 such as fabric, paper, film, etc.
passes through an appropriate system such as a tension adjustment device 10, a plurality of guide rollers 11, a guider 12, etc.
It is introduced into a rotary screen coating apparatus, generally designated 2.

The rotary screen coating device 2 is
A main roller 4 is supported on the machine base 3 and is rotated and driven in the direction of the arrow by a known method (not shown). A rotary screen unit 6 is installed on the outer periphery of the main roller 4 from position B to A and then to C.
During this time, it is rotatably provided at any angular position, and is fixed at an optimal position while finely adjusting the amount of application, as will be described later.

The base material 1 is wound around the main roller 4 via the nip roller 5, and is fed in the direction of the arrow by its circumferential speed. There is a feed roller 13 behind the main roller 4, which guides the substrate 1 to a drying device and the like at the rear.

A rotary screen 7 is supported on the rotary screen unit 6 in contact with the main roller 4, and is driven to rotate at the same circumferential speed as the main roller 4 in the direction of the arrow. A doctor device 8 is provided inside the rotary screen 7 so that its pressure can be adjusted on both sides by an adjustment device 9.

In FIG. 2, when the base material 1 passes between the main roller 4 and the rotary screen 7, the foaming liquid from the foaming liquid supply device 21 (described later) is evenly applied by the doctor device 8 through the mesh of the rotary screen 7. It is something that will be done.

In FIGS. 2 and 3, a doctor device 8 which also serves as a foaming liquid guide is provided inside the rotary screen 7. The doctor device 8 is a support tube 14
This support tube 14 passes through the rotary screen 7 and is fixed at both ends to movable ends (not shown) of the adjustment device 9. A foaming liquid supply pipe 15 is integrally and concentrically provided inside the support tube 14, and is connected to a foaming liquid supply device 21 (see FIG. 3), which will be described later.
connected to.

The double structure of the support tube 14 and the supply tube 15 is effective in uniformly supplying the foaming liquid 20 to the width direction of the base material 1. The foaming liquid 20 from the supply device 21 passes into the supply pipe 15, and flows out evenly to the left and right from an oblong hole 15' provided in the center of the supply pipe 15.
The inside of the support tube 14 is filled. A large number of small holes 14' are perforated in a row in the longitudinal direction of this, and the foaming liquid 20 supplied to the center part is passed through the small holes 14'.
It flows out evenly across the width. In a normal rotary screen device, the support tube 14
Since the supply is only from one side, an uneven supply state in the width direction cannot be avoided.

In FIG. 2, the support tube 14 is fitted with a receiving trough 16 at its lower part, and the foaming liquid 20 flowing out from the small hole 14' of the support tube is guided between the upper and lower surfaces thereof. At the tip of the receiving trough 16, a band-shaped sealing material 17 is attached to the lower part thereof, and a scale holder 18 is attached to the upper part thereof, and furthermore, a scalee 19 is fixed to this. Seal material 17 and squeegee 1
Each tip of 9 is a rotary screen 7
These are arranged so as to be in close contact with the inner circumferential surface of the housing, and are made of an elastic material so that a smooth press-contact state can be obtained. Therefore, even if the squeegee 19 is deformed when the contact pressure is adjusted by the adjusting device 9, the ends thereof and the inner circumferential surface of the rotary screen 7 are always sealed in the width direction.

The supplied foaming liquid 20 passes through the supply pipe 15, the oblong hole 15' provided therein, the support pipe 14, these small holes 14', the receiving gutter 16, and then the sealing material 1.
7. The foaming liquid is guided between the squeegees 19 and reaches the inner peripheral surface of the screen 7. Here, foaming liquid 20
is fed to the tip of the squeegee 19 by the supply pressure, and is converted into a drain by the rotational frictional force with the screen 7 and the contact pressure of the squeegee 19, and is evenly applied to the surface of the base material 1 through the mesh of the screen. .

In Fig. 3, the outline of the present invention is shown in the width direction.
It also illustrates the supply and recovery routes.

As described above, the base material 1 is wound around the main roller 4 and sent, but in FIG. 3, it is assumed that the base material 1 moves in a plane from bottom to top in the direction of the arrow. As shown in FIG. 3, the base material 1 is provided with a main roller 4 on its back side, a rotary screen 7 on its front side, and a doctor device 8 inside which also serves as a foaming liquid guide. As described above, the doctor device 8 is composed of the support pipe 14, the supply pipe 15, the receiving gutter 16, etc., and the supply pipe 15 is connected to the foaming liquid supply device 21, and the foaming liquid is applied to the substrate surface through the above-mentioned system. be done.

The foaming liquid supply device 21 includes a stock solution line 25 from a stock solution supply pump 22 to a mixing head 23, a pressure regulating valve 28, a pressure gauge 29, a flow regulating valve 30,
and a flow meter 31. The undiluted solution in the undiluted solution tank 24 is transferred to the conduit 25.
The water is sucked into the pump 22 and pumped through the conduit 25' to the mixing head 23. On the other hand, air source 2
The high pressure air from 6 is connected to the pressure regulating valve 2 from piping 27.
8, a pipe 27', a flow rate adjustment valve 30, a flow meter 31, and a pipe 27'' to join a conduit 25', where the stock solution and air are mixed and sent under pressure to the mixing head 23.

Although the mixing head 23 is not shown, it is rotationally driven by a separate motor. The mixture of stock solution and air pumped into this is thoroughly stirred finely and uniformly to become a stable foaming liquid, which is connected to the supply pipe 15 through a conduit 25''.

Although the stock solution supply pump 22 is also not shown, it is rotationally driven by a separate motor with a variable rotation speed. The so-called blow ratio (volume ratio of stock solution:air) is determined by the amount of stock liquid that is pumped in proportion to the rotational speed and the amount of air that is adjusted by the flow rate regulating valve 30. The amount of raw solution supplied is determined by the rotation speed of the supply pump 22, and the amount of air corresponding to the air pressure (differential pressure from the mixing pressure) is displayed on the flow meter 31, ensuring a blow ratio suitable for the purpose. be.

In addition, in order to automatically control the amount of foaming liquid supplied according to the feeding speed of the base material 1 while keeping the blow ratio constant, a touch roller 32 is provided on the four main roller surfaces and rotates at the same circumferential speed, and is connected to this. It is also possible to provide a speed detector 33 and a proportional control device 34 to control the number of rotations of the pump 22, and further to control the amount of air by using an electric flow rate regulating valve 30.

In the present invention, from the foaming liquid supply device 21 described in detail above, through the supply pipe 14, support pipe 15, receiving gutter 16, etc., a coating amount larger than the required amount is applied into the doctor device 8 which also serves as a foaming liquid guide. amount of foaming liquid 20 is supplied.

Furthermore, as shown in Figures 3 and 4, the receiving gutter 1
6. The foaming liquid suction nozzle 35 is arranged on both side edges of the foaming liquid guide partitioned by the cage 19 and the sealing material without closing them with walls. This pair of suction nozzles 35, 35 causes the foaming liquid supplied during the foaming liquid guide to flow outward in the width direction in an amount larger than the applied amount, thereby spreading the foaming liquid over the entire effective mesh surface of the rotary screen. It serves to uniformly supply the foaming liquid over the width and to eliminate stagnation of the foaming liquid in the width direction.

In the embodiment shown in FIGS. 3 and 4, the suction nozzle 35 completely covers the cross section of the receiving trough 16, but extends along the guide path between the cage 19 and the sealing material 17 and substantially covers the cross section. It is designed to cover. In other words, the main purpose of the suction nozzle 35 is to suck the foaming liquid in the foaming liquid guide and to give the foaming liquid an outward flow in the width direction. Even if a gap is formed, no problem will occur. The suction nozzle 35 is connected to a vacuum recovery device 38 via a suction pipe 36. Thus, the foaming liquid sucked by the suction nozzle 35 is guided to the outside through the suction pipe, reaches the recovery device 38, and is stored in the form of a liquid.

In the present invention, as shown in FIG. 3, the width of the foaming liquid applied by the rotary screen 7 and the doctor device 8 is always set to be wider than W of the substrate 1 by an amount w on both sides. suction nozzle 3
It is particularly desirable to arrange 5. That is, there is a small distance w between the edge of the substrate 1 to be coated and the suction nozzle 35.
By providing this, the influence of suction by the foaming liquid nozzle 35 can be prevented. Further, although the base material 1 tends to have some meandering, it is possible to uniformly apply the foaming liquid to the edges regardless of such meandering. Furthermore, although the edge portions are susceptible to the effect of foaming liquid draining, such an effect can be avoided by increasing the coating width.

The w on both sides that is wider than the coating width W is generally 20
Set as appropriate from the range of mm to 100 mm.

In this case, the liquid overflows from both sides of the base material 1 and also adheres to the main roller 4 by about the width W, but in order to continuously collect this, the liquid is placed in contact with the width W of the base material 1 on both sides thereof. A drain recovery nozzle 37 is provided at the bottom and is connected to a recovery device 38 via a suction pipe 36'. The excess foaming liquid and drain liquid sucked and collected by the recovery device 38 are converted into drains in the recovery device, and are circulated to the stock solution tank 24 by the liquid sending pump 39.
Recycling is also possible depending on the case.

Further, the excess foaming liquid adhering to the main roller 4 by a width w is cleaned and dehydrated by a cleaning device 40 shown in FIG.

In the present invention, the amount of foaming liquid supplied to the foaming liquid guide varies depending on the substrate, the type of stock solution, and the application of the product, but generally varies from a minimum of 102% to a maximum of 125% of the required application amount. let

In FIG. 1, the coating amount adjustment by adjusting the position of the screen unit 6 is performed as follows.

That is, at position A, the weight of the foaming liquid acts to subtract from the foaming liquid feeding pressure during guidance, and at position C, the weight of the foaming liquid acts to add to the foaming liquid feeding pressure during guidance. However, position B is between these A and C positions. In this way, as described above at the ABC position, the amount of coating on the substrate 1 will inevitably change as the self-weight effect of the coating liquid changes, and when other factors are kept the same, the amount of coating on the substrate 1 will change at position A. The minimum is the intermediate position B, and the maximum is the position C, allowing fine adjustment.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a rotary screen coating device used in the present invention. FIG. 2 is a sectional view showing a rotary screen and a doctor device provided therein which also serves as a foaming liquid guide. Third
The figure is a partial sectional view showing the foaming liquid supply and recovery system of the present invention together with a screen. FIG. 4 is a sectional view showing the foaming liquid absorption nozzle in FIG. 3 together with a screen and a doctor device. 1...Base material, 2...Rotary screen coating device, 3...Machine stand, 4...Main roller, 5...
Nip roller, 6... Rotary screen unit, 7... Rotary screen, 8... Doctor device, 9... Adjustment device, 10... Tension adjustment device, 11... Guide roller, 12... Guider, 1
3...Feeding roller, 14...Support tube, 14'...
Small hole, 15...supply pipe, 15'...oblong hole, 15''...partition wall, 16...receiving gutter, 17...sealing material, 18...scagee holder, 19...scagee, 20...foaming liquid, 21...foaming liquid supply Device, 22... Stock solution supply pump, 23... Mixing head, 24... Stock solution tank, 25, 25', 25''... Conduit, 26... Air source, 27, 27', 27''... Piping, 28... Pressure adjustment valve, 29 ...Pressure gauge, 30...Flow rate adjustment valve, 31...Flow meter, 32...Tanti roller, 33...Speed detector, 34...Proportional control device, 35...Foaming liquid suction nozzle, 36, 36'...Suction pipe, 37...Drain Recovery nozzle, 38... Recovery device, 39... Liquid feeding pump, 40... Cleaning device.

Claims (1)

[Claims] 1. For long base materials such as fabric, paper, and film,
In a method of applying a foaming liquid through a rotary screen, the foaming liquid is placed in the rotary screen, the feed side surface of the rotary screen is regulated by a cage, and the foaming liquid is opened from approximately the center of the rotary screen to the mesh surface of the rotary screen. a guide is arranged over the entire effective width of the rotary screen, supplying a foaming liquid in an amount larger than the application amount during the guide, and sucking the foaming liquid being guided at both side edges of the guide, A method for applying a foaming liquid, characterized in that during the guiding, the foaming liquid is made to flow toward the mesh surface of the rotary screen, and also to flow in the width direction of the rotary screen. 2. Formed between a squage where the tip of the foaming liquid guide contacts the screen, an elastic sealing material placed on the inlet side of the cage with a small interval so that the tip comes into contact with the screen, and a foaming liquid receiving gutter connected to these. A method according to claim 1. 3. The foaming liquid is applied in a width wider than the base material, and a suction nozzle is disposed outside the application width and inside the screen to suck the foaming liquid. Method.