JPH1157575A - Adhesive coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive coating device capable of applying a required quantity of the adhesive only on a required area of various kinds of sheets different in shape or dimension respectively without generating waste. SOLUTION: The sheet P is held by transporting rollers 1, 2 and pressure contact rollers 3, 4 to be transported. A coating head 6 provided with plural jetting parts 7 and an edge sensor 10 for detecting the edge of the sheet P are provided on a moving supporting base movable on a guide rail 13. Plural openings 23 are perforated on a orifice plate 21 in a straight line and a piezo- diaphragm 24 vibrates by applying high frequency A.C. voltage, the vibration increases the pressure in a coating liquid chamber C and then, the coating liquid is injected from the openings 23 of the orifice plate 21 with a strong orientation. The on-off of injection of the coating liquid is controlled at an extremely high speed by the on-off of the voltage applied to the piezo-diaphragm 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive coating apparatus for coating an adhesive on the back surface of a sheet such as paper, a plastic sheet, and a cloth.

[0002]

2. Description of the Related Art Conventionally, there is a type in which an adhesive is applied to the back surface of a sheet such as paper, a plastic sheet, or a cloth.
It is provided for the purpose of sticking to the surface of another member for use. Conventionally, such an adhesive coating process is performed by a mass production coating apparatus in a factory, and is produced, stored, and distributed in large quantities as a glued processed sheet.

[0003] JP-A-6-184502 discloses a coating apparatus using a roller. The structure is shown in FIG. The sheet 124 is sandwiched between the backup roller 121 and the coating roller 122 and is conveyed in the direction of the arrow. The adhesive 123 adhered to the surface of the coating roller 122 has a thickness defined by the blade 125, and is transferred to the sheet 124 at a portion closest to the backup roller 121.

JP-A-8-224503 discloses a coating apparatus using a nozzle. The structure is shown in FIG. The paint liquid is sent from the pressurized paint supply device 134 to the nozzle device 132. The nozzle device 132 has a large number of pores 13.
1 from which the coating liquid is supplied to the surface to be coated W as a continuous jet. The nozzle device 132 is driven and scanned by the robot arm 135, whereby a desired area of the surface to be coated W is coated.

Japanese Patent Application Laid-Open No. 7-299901 discloses a spray coating apparatus for an ink jet recording apparatus. The configuration is shown in FIG. Recording medium 210
Is conveyed by the rotation of the platen roller 211. The transport table 212 supporting the spray 221 is provided by a lead screw 213 and a guide rail 214 so as to be movable in a direction substantially perpendicular to the transport direction of the recording medium 210. The spray 221 performs a coating process on the surface of the recording medium 210 prior to inkjet printing so that a good print can be performed.

[0006]

A coating apparatus for transferring a coating liquid through a roller as shown in FIG. 5A is suitable for performing a large amount of coating on a long sheet. It is not suitable to apply an adhesive to a wide variety of sheets having different shapes and dimensions because many preparation operations such as adjustment of a coating width are required.

In a coating apparatus using a nozzle for supplying a small stream of a coating liquid as shown in FIG. 5B, it is difficult to control the coating width and to stop the flow of the adhesive instantaneously. It is not suitable for coating on, in other words, coating on any area.

In a coating apparatus using a spray for spraying a coating liquid as shown in FIG. 5 (c), the coating liquid has a strong tendency to scatter to the surroundings and the outline of the coating area becomes unclear, so that it is possible to reach the end of the sheet. It is difficult to apply a sufficient amount of coating. In addition, in such a case, the amount of the coating liquid scattered off the sheet is significantly increased, and the surrounding area is extremely soiled.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive coating apparatus which can easily coat a wide variety of sheets having different shapes and dimensions without scattering a coating liquid in a region other than a desired area and in a necessary amount without waste when needed. It is to provide.

[0010]

According to the first aspect of the present invention, there is provided an adhesive coating apparatus for coating an arbitrary area on the back surface of a sheet with an adhesive, wherein an adhesive coating liquid is supplied by its own weight. Including the injection part,
An on-demand coating head, which is capable of injecting only the coating liquid without a compressed gas flow, the on / off of which is controlled by an electric signal, and a main coating scan in which the coating head is reciprocated in the main coating scan direction across the sheet Means, a sub-coating scanning means for relatively moving the sheet in a sub-coating scanning direction intersecting with the main coating scanning direction, and a coating position signal for one of an end position or an effective coating area position of the sheet in the main coating scanning direction. And a coating control means for controlling the ejection of the coating liquid from the coating head and the reciprocating motion of the coating head based on the coating position signal.

According to a second aspect of the present invention, in the apparatus of the first aspect, the main coating scanning means includes a movable support for supporting the coating head so as to be movable in a main coating scanning direction, and wherein the coating position signal is generated. The means includes an edge sensor for detecting an end position of the sheet attached to the moving support, and the coating control means injects a coating liquid onto a back surface of the sheet based on a detection signal of the edge sensor, and the back surface of the sheet. The spraying of the coating liquid is stopped at a position outside the range.

According to a third aspect of the present invention, there is provided an adhesive coating apparatus for coating an adhesive on an arbitrary area on a back surface of a sheet, the apparatus including an injection unit to which an adhesive coating liquid is supplied by its own weight. An on-demand coating head, which can spray only the coating liquid without a compressed gas flow, the on / off of which is controlled by an electric signal, and a main coating which reciprocates the coating head in a main coating scanning direction across the sheet Scanning means; sub-coating scanning means for relatively moving the sheet in the sub-coating scanning direction intersecting with the main coating scanning direction; and one of the end positions of the sheet in the main coating scanning direction or the effective coating area position Coating position signal generating means for generating a signal Coating control means for controlling the ejection of the coating liquid from the coating head and the reciprocating movement of the coating head based on the coating position signal, and a release sheet supply press-contact means for supplying a release sheet to the coated area of the sheet and pressing them together And

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, an adhesive coating device according to a first embodiment will be described with reference to FIG. 1A is a side view of the apparatus, FIG. 1B is a front view of the apparatus, and FIG. 1C is a detailed view of the coating head.

In FIG. 1A and FIG. 1B, the symbol P
Indicates a sheet to be coated with an adhesive, arrows in the drawing indicate the conveying direction of the sheet P, and E1 and E2 indicate edges of the sheet P parallel to the conveying direction.

The sheet P is conveyed while being held by conveying rollers 1 and 2 and pressing rollers 3 and 4. The coating head 6 is located at a position facing the back surface of the sheet P.
Are arranged, and a plurality of injection units 7 are arranged in a direction along the edges E1 and E2. A supply tube 8 for supplying a coating liquid and a connector 9 for supplying power are connected to the coating head 6.
An edge sensor 10 for detecting the edge of the sheet P is further provided at a position facing the plane of the sheet P, and a connector 11 for feeding power is provided on the edge sensor 10.

Coating head 6 and edge sensor 1
Numerals 0 are both held by a movable support table 12, and the movable support table 12 is movably supported on a guide rail 13 by driving means (not shown). The moving range of the coating head 6 and the like is preferably set to be at least larger than the width of the sheet P in order to ensure coating. In addition, a transport motor 5 that applies a driving force to the transport roller 1 is provided.

The coating control circuit 16 receives the signal from the edge sensor 10 and controls the ejection of the coating head 6, and also controls the sub-coating scanning control circuit 17. Alternatively, the ejection of the coating head 6 is controlled in response to a signal from the sub-coating scanning control circuit 17.

The coating head 6 has a plurality of ejecting sections, and ejects only droplet particles in a limited direction from each ejecting section by the vibration of the high-frequency vibrating element, and has a strip shape having a width in the arrangement direction of the ejecting sections. That can form a coating region of

FIG. 1 shows an example of the structure of the coating head 6.
It is shown in (c). The coating liquid chamber C is a piezo diaphragm 2
4, an orifice plate 21 and a side wall 20, which are supported by a support 26. The coating liquid chamber C is connected to the supply tube 8 via a supply port 25 provided in the support 26. The orifice plate 21 has a plurality of openings 23 perforated in a straight line or in a plurality of rows.

The piezo diaphragm 24, which is a high-frequency vibrator, is polarized in advance, and electrodes are attached to both surfaces thereof. In the present embodiment, by selecting a combination of the polarization direction and the voltage application direction, or by using a bimorph structure in which the piezo vibration plate 24 and another electric field non-responsive plate are combined, the deformation as shown by the broken line in the figure at the time of voltage application is achieved. Is generated.

The piezo diaphragm 24 is instantaneously applied by applying a voltage.
Is deformed, the pressure in the coating liquid chamber C increases,
The coating liquid is sprayed from the opening 23 of the orifice plate 21. If the voltage applied to the piezo diaphragm 24 is a high-frequency pulse or a high-frequency AC voltage, the injection of the coating liquid is repeated at a high speed. The coating liquid is supplied through the supply tube 25 through the supply port 25. The coating liquid is supplied from the opening 23 through the orifice plate 21.
The coating liquid that has been jetted vertically has a limited flight direction, has a strong directionality, and its droplet landing position is accurately positioned.

The on / off of the spraying of the coating liquid can be controlled at a very high speed by the on / off of the voltage application to the piezo diaphragm 24. Further, it is preferable that the vibration cycle of the piezo diaphragm 24 is set to several hundreds to several thousands Hz, and the diameter of the coating droplet is set to be several microns to several hundred microns. preferable. The injection amount of the coating liquid can be controlled by changing the amplitude or frequency of the voltage applied to the piezo diaphragm 24.
In addition, the specific shape and size of the opening 23 are determined by the viscosity of the coating liquid and the required amount of coating liquid to be sprayed.

Next, as a second embodiment, FIG.
Another coating head 6 suitably applicable to the adhesive coating apparatus shown in FIG. 1A and FIG. 1B will be described with reference to FIG. FIG. 2A is a schematic view of a coating head, and FIG. 2B is an enlarged view of the porous film.

In FIG. 2 (a), a liquid container 31 contains a coating liquid (ie, an adhesive) 32.
The coating liquid 32 is supplied to the porous film 35 via the capillary 33. The piezoelectric vibrating plate 37, which is a vibrating means, vibrates upon receiving a voltage from a high frequency power supply 38, and ejects the liquid 32 as small droplets from the opening 23 'of the porous film 35. Since this coating head sprays a few drops from the opening position of the porous membrane and regulates the spraying direction in the direction of the opening axis, it is suitable for coating in a limited area.

The size of the droplet can be prepared by setting the size from a submicron size to a large size of several hundred microns. However, with a submicron size, the flight direction is likely to shift irregularly. Therefore, it is desirable to use a droplet diameter on the order of microns or more and to limit the flight direction.

In the porous film 35, as shown in FIG. 2 (b), the openings 23 'are arranged in one or a plurality of rows so that a strip-shaped coating region along an array of openings with sharp boundaries is formed. It is preferable to configure so that it can be formed.

Hereinafter, the operation of the adhesive coating apparatus will be described in detail. 1A and 1B, the conveying roller 1 is rotated by a conveying motor 5 controlled by a sub-coating scanning control circuit 17, whereby the sheet P is fed in the direction of arrow Y. This feed may be continuous or stepwise. The coating control circuit 16 includes the sub-coating scanning control circuit 1
In response to the signal from 7, the motor (not shown) is rotated to move the movable support 12 in the direction of the arrow X, thereby starting the main coating scan.

When the movable support table 12 is moved from the position shown in FIG.
Is moved in the X direction across the sheet P, the edge sensor 10 that moves together with the edge sensor 10 detects the edge E1 of the sheet P,
The coating control circuit 16 turns on the coating head 6 slightly after the edge detection, that is, after the on-demand coating head 6 has passed the edge E1 portion.

When the moving support 12 passes the other edge E2 of the sheet P, first, the edge sensor 10 detects the position of the edge E2, and accordingly, the coating control circuit 16 causes the on-demand coating head 6 to detect the position of the edge E2.
The coating head 6 is turned off before the coating position passes the edge E2.

When the coating is to be performed also on the return path of the main coating scan, the positions of the edges E1 and E2 are stored, and the coating control circuit 16 controls the on / off of the coating head 6 based on the stored position. I do. Alternatively, in addition to the edge sensor 10,
Another edge sensor for coating head 6
May be provided on the opposite side with respect to the position of the injection unit, and the sensor signal may be switched in the going and returning main coating scans and used for control.

By one main coating scan, an elongated strip-shaped coating area having a width in the feed direction Y of the sheet P covered by the plurality of jetting units 7 is formed. Therefore, the coating control circuit 16 sets the feed amount of the sub-coating scan so that the feed width in the Y direction of the sheet and the coating width match.

The coating head 6 is required to be capable of high-speed on / off control. At the same time, the jet flight direction must be limited so that the coating droplets adhere only to the desired area on the sheet surface and do not scatter and float, and contaminate the others. It is necessary to use a plate that generates a jetting force, jets only droplets of a desired diameter controlled in a predetermined direction from the jetting unit, and does not involve pressurized air jetting.

The signal indicating the end position of the sheet P is desirably generated by the edge sensor 10 in the illustrated example. However, the present invention is not necessarily limited to this, and the designated position input means by manual operation, for example, It can also be set by an input from the operation panel or by mechanical means such as an instruction slide scale.

Further, the coating area by the coating head 6 can be set based on the designated effective coating area separately from the edge of the sheet P. In this case, the position may be specified by a distance from the edge of the sheet, or may be input as a coordinate value by another specifying means.

Further, the amount of the main coating scan feed of the coating head 6 may be made to coincide with the coating area, and the coating head 6 may be operated continuously in the ON state, but the coating head 6 is moved in the main coating scanning direction. When the coating head 6 is controlled to be turned on only in the coating area while reciprocating beyond the range, the apparatus can be easily configured and uniform coating can be obtained.

For this reason, in the above-described coating apparatus, the coating head 6 is reciprocated to a position beyond the end signal address position, and droplets are ejected inside the end signal address position and liquid is ejected outside the end signal address position. A coating control circuit 16 for stopping the ejection of the droplet is provided.

FIG. 3 is a time chart for explaining the control of the coating control circuit 16. FIG. 3A shows on / off control of the edge sensor, FIG. 3B shows reciprocation and stop control of main coating scanning, and FIG. 3C shows on / off control of the coating head.

The coating control circuit 16 starts the main coating scan by moving the movable support table 12 from the home position located off the sheet P in the horizontal direction in FIG. Edge sensor 10 on moving support 12
Reaches the edge of the sheet P at time T1, and the sensor output is turned on.

Then, the coating head 6 is turned on at a time T2 when the coating head 6 arrives inside the edge E1 of the sheet P after a further lapse of time t. At a time T3 near the end of the scan, the edge sensor 10 detects the edge E2, and based on this signal, turns off the coating head 6 before the coating head 6 crosses the edge. Thereafter, the forward movement is stopped at a time point T4 at a position separated from the edge E2 by a predetermined distance, and a backward movement for moving the coating head 6 in the direction opposite to the above-described direction is started at a time point T5 immediately thereafter.

The edge sensor 10 detects the edge E2 at the time T6.
Is located inside the edge E2, the coating head 6 is immediately turned on, kept on for the same moving distance as in the forward movement, the scanning feed is stopped, and the scanning in the forward movement direction is started again. Next, the coating control circuit 16 detects the edge E1
Is determined based on the longer time, which is the time required for stopping due to overrun, or the rising time required to start in the reverse direction and reach a predetermined scanning speed, after detecting E2 and E2. .

In the above control example, one edge sensor 1
Although the case where 0 is used is shown, the use of two sensors enables more flexible control as described above, and the coordinate designation indicating the coating area and the scanning of the coating head 6 by another means. Similar control is possible even if the position can be determined.

As described above, by performing the main coating scan over the edge of the sheet P and the desired coating area, the feed speed of the main coating scan can be stabilized at a constant value in the coating area. The occurrence of coating unevenness can be avoided.

In this coating apparatus, a strip-shaped coating having a width S in the feeding direction of the sheet P, that is, the sub-coating scanning direction Y, and being long in the main coating scanning direction is provided for each forward or backward movement of one main coating scan. The sheet P is fed in the Y direction, and is connected to perform coating on a wide surface.

As the coating liquid or adhesive liquid used in the apparatus, a pressure-sensitive adhesive, for example, an acrylic emulsion-based pressure-sensitive adhesive (TK8005 manufactured by Rohm & Haas Co., Ltd.) is suitable. Or a type of applying water immediately before construction to obtain an adhesive force.

Next, as a third embodiment, another adhesive coating apparatus will be described with reference to FIG.
When a tacky adhesive is used for the coating liquid, the sheet discharged from the coating apparatus can be immediately attached to a desired place. However, when the sticking operation is not performed immediately after the coating or when the sheets are long, there is a problem that the sheets are stuck to each other or to the coating apparatus or the floor.

The coating apparatus according to the present embodiment has solved such a problem. As shown in FIG. 4, in addition to the apparatus configuration shown in FIG. It further includes a release sheet roller 18 and press-contact conveyance rollers 14 and 15 for pressing the coated sheet and the release sheet.

The release sheet supplied from the release sheet roller 18 is obtained by coating or impregnating the surface of a paper or plastic sheet with a silicone-based release agent or a wax-based release agent, which is coated with an adhesive. The pressing rollers 14 and 15 are superimposed on the sheet P.
To the nip. Press rollers 14 and 15
Is the coated sheet P that is sent over
The sheet is conveyed while being pressed against the release sheet.

The pressing roller 14 is a roller also serving as a transport roller, and is formed of a rigid roller such as a metal roller. On the other hand, the pressing roller 15 is preferably formed of an elastic roller such as foamed plastic or rubber. .

According to this embodiment, since the adhesive coated on the sheet is covered with the release sheet, it is possible to effectively prevent the sheet from sticking to an undesired member. Therefore, it can be wound up and stored as it is, and can be easily moved to a place where work is easy after coating.

Although several embodiments have been specifically described above, these are merely examples of the present invention. The present specification includes the following inventions. 1. An adhesive coating device for coating an adhesive on an arbitrary area on the back surface of the sheet, the adhesive coating liquid supplied to the coating head injection unit by its own weight, and the on / off of direct injection is controlled by an electric signal, An on-demand coating head for jetting only the coating liquid of the adhesive without a compressed gas flow by the jetting force generated by the jetting section; and a main coating scanning means for reciprocating the coating head in a direction transverse to the sheet. A sub-coating scanning means for causing the back surface of the sheet to face the coating head and relatively moving the sheet in a direction intersecting the scanning direction; and coating one of an end position in the main coating scanning direction of the sheet or an effective coating area position Means for generating the end position signal and the coating position Adhesive coating apparatus characterized in that a coating control means for controlling the reciprocation of the injection and coating head of the coating liquid from the coating head on the basis of the signal.

2. 2. The adhesive coating apparatus according to claim 1, wherein an edge sensor for detecting an end position of the sheet provided integrally with a movable support for reciprocating a coating head in a main coating scanning direction is provided, based on a detection signal of the edge sensor. An adhesive coating apparatus, comprising: coating control means for spraying an adhesive on the back surface of the sheet and controlling the coating head so as to stop the injection of the adhesive at a position off the back surface of the sheet.

3. 2. The adhesive coating apparatus according to claim 1, further comprising coating control means for reciprocating the coating head beyond the coating end position, injecting the coating liquid inside the coating end position, and stopping the injection outside the coating end position. An adhesive coating device, characterized in that:

4. An adhesive coating apparatus for coating an adhesive on an arbitrary area on the back surface of a sheet, wherein an on / off of an adhesive coating liquid supplied to an injection unit of a coating head by its own weight and direct injection of an electronic signal are controlled by an electric signal. , By the injection force generated by the injection unit,
An on-demand coating head for injecting only the adhesive coating liquid without a compressed gas flow, main coating scanning means for reciprocating the coating head in a direction transverse to the sheet, and a back surface of the sheet facing the coating head A sub-coating scanning means for relatively moving in a direction intersecting the scanning direction, a means for supplying a release sheet to a coated area of the sheet and pressing the two together, and an end position or effective coating of the sheet in the main coating scanning direction. Means for generating a coating position signal for any one of the area positions; and coating control means for controlling the ejection of the coating liquid from the coating head and the reciprocation of the coating head based on the coating position signal. Adhesive coating Location.

5. 5. The adhesive coating apparatus according to claim 4, wherein an edge sensor for detecting an end position of the sheet, which is provided integrally with a movable support for reciprocating the coating head in the main coating scanning direction, and a detection signal of the edge sensor. An adhesive coating apparatus, comprising: coating control means for spraying an adhesive on the back surface of the sheet and controlling the coating head so as to stop the injection of the adhesive at a position off the back surface of the sheet.

6. 5. The adhesive coating apparatus according to claim 4, wherein coating control means is provided for reciprocating the coating head beyond the coating end position, spraying the coating liquid inside the coating end position, and stopping the spraying outside the coating end position. An adhesive coating device, characterized in that:

7. 5. The adhesive coating apparatus according to claim 4, wherein a coating liquid of an adhesive is supplied to the coating head.

[0057]

According to the present invention, there is provided an adhesive coating apparatus which can easily apply a required amount of adhesive to only a desired area on a wide variety of sheets having different shapes and dimensions without waste.

[Brief description of the drawings]

FIG. 1 is a diagram of an adhesive coating apparatus according to the present invention.

FIG. 2 shows another coating head.

FIG. 3 is a time chart for explaining control of a coating control circuit.

FIG. 4 is a diagram of another adhesive coating device according to the present invention.

FIG. 5 is a view showing a conventional adhesive coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 2 Transport roller 3, 4 Pressure contact roller 6 Coating head 7 Injection part 10 Edge sensor 12 Moving support stand 13 Guide rail 16 Coating control circuit 21 Orifice plate 23 Opening 24 Piezo diaphragm

Claims (3)

[Claims] 1. An adhesive coating apparatus for coating an adhesive on an arbitrary area on a back surface of a sheet, comprising an injection section supplied with a coating liquid of the adhesive by its own weight, and having a compressed gas flow. An on-demand coating head in which only the coating liquid can be sprayed without being controlled by an electric signal; a main coating scanning means for reciprocating the coating head in a main coating scanning direction across a sheet; and the main coating. A sub-coating scanning means for relatively moving the sheet in the sub-coating scanning direction intersecting the scanning direction; and a coating position signal for generating any one of an end position and an effective coating area position of the sheet in the main coating scanning direction. Generation means and coating position Coating liquid injection and coating control means and in that the adhesive coating apparatus has a for controlling the reciprocal movement of the coating head from the coating head on the basis of the issue. 2. The apparatus according to claim 1, wherein the main coating scanning unit includes a moving support table that movably supports the coating head in a main coating scanning direction, and the coating position signal generating unit includes the moving support. An edge sensor for detecting an end position of the sheet attached to the body, wherein the coating control means sprays a coating liquid on a back surface of the sheet based on a detection signal of the edge sensor, and coats at a position where the back surface of the sheet comes off. An adhesive coating device that stops spraying liquid. 3. An adhesive coating apparatus for coating an adhesive on an arbitrary area on a back surface of a sheet, the apparatus including an injection unit supplied with a coating liquid of the adhesive by its own weight, and having a compressed gas flow. An on-demand coating head in which only the coating liquid can be sprayed without being controlled by an electric signal; a main coating scanning means for reciprocating the coating head in a main coating scanning direction across a sheet; and the main coating. A sub-coating scanning means for relatively moving the sheet in the sub-coating scanning direction intersecting the scanning direction; and a coating position signal for generating any one of an end position and an effective coating area position of the sheet in the main coating scanning direction. Generation means and coating position Coating control means for controlling the spraying of the coating liquid from the coating head and the reciprocating motion of the coating head based on the signal, and a release sheet supply pressing means for supplying a release sheet to the coated area of the sheet and pressing them together. Adhesive coating equipment.