JPS59230664A - Adhesive coating apparatus - Google Patents

Abstract

PURPOSE:To smoothly coat an adhesive by suppressing the viscosity change and the curing of the adhesive, by providing an adhesive supply nozzle and an adhesive return nozzle while utilizing the space between both nozzles as an adhesive flowing space part. CONSTITUTION:The suction port 19A of a cylindrical return nozzle 19 is arranged to the emitting port 18A of a supply nozzle 18 through an adhesive flowing space part S and the adhesive, which is emitted from the emitting port 18A of the nozzle 18 and spherically built up by surface tension while flowed out to the adhesive flowing space part S in an exposed state, is returned to a container 11 from the suction port 19A. The adhesive flowing through the adhesive flowing space part S is adhered to an object to be coated. By this method, the adhesive is coated regardless of the viscosity of the adhesive while the coating time, the coating range and the coating amount thereof are well controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive applicator, particularly for labeling machines, packaging machines, and other industrial equipment.
Adhesives such as solvent-based adhesives, emulsion-type adhesives such as acrylic esters, synthetic polymer adhesives, heat-melting adhesives containing solder, etc., can be applied to lamil, wrapping paper, packaging containers, and other objects to be coated. The present invention relates to an adhesive application device that can apply adhesive to surfaces.

FIG. 1 is an explanatory diagram showing a conventional adhesive coating device. Adhesive in an adhesive tank 2 is fed under pressure to a discharge cylinder 1, and its nozzle 3 can be opened and closed by a valve body 5 operated by a pneumatic cylinder device 4. In addition, the pressure air of the air pressure source 6 is as follows.

While the adhesive in the adhesive tank 2 is fully pressurized.

The pneumatic cylinder device 4 can be driven via the control valve 7. That is, in this adhesive applicator, by operating the control valve 7 and separating the valve body 5 from the valve seat 8 by a predetermined distance, a predetermined flow rate of adhesive is discharged from the nozzle 3 and onto the object 9 to be coated. Can be applied.

However, the conventional adhesive application device described above has the following drawbacks. That is, (1) due to the influence of friction with the inner wall surface of the passage pipe, the adhesive is discharged thicker (later) from the nozzle 3 than when the control valve 1 is switched. This causes variations in the delay described above.As a result, the responsiveness during high-speed coating becomes poor (and the controllability of the coating timing and coating range deteriorates.In other words, the applicability of the coating device described above is limited to adhesives with relatively low viscosity. It is difficult to apply high viscosity adhesives smoothly, and the application is limited to relatively low speed conditions.

(2) When coating the object by moving the entire nozzle part, a large and heavy discharge cylinder 1. It is necessary to move the entire pneumatic cylinder device 4, etc., and from this point of view as well, responsiveness during high-speed coating is poor. (3) At the end of the coating work shown in Figure 2, if the nozzle 3 is moved away from the object 9 to be coated, the stringing sound of the adhesive as shown in Figure 2 (CB) will occur, and the timing and range of application will be determined. controllability is poor. (4) Even after the valve body 5 closes the nozzle 3 after the application process, the adhesive remaining in the nozzle 3 may drip from the opening of the nozzle 3 or harden after a long period of time, causing the adhesive to is difficult to handle.

(6) It is very difficult to clean the discharge cylinder 1 and the adhesive transport pipe when changing the line type of adhesive due to changing the object 9 to be coated or when finishing the work.

The present invention does not depend on the viscosity of the adhesive;
In addition to improving the controllability of the application range and amount,
It is an object of the present invention to provide an adhesive coating device that completely suppresses changes in viscosity and hardening of an adhesive, can smoothly apply even relatively high viscosity adhesives, and can be cleaned easily.

In order to achieve the above object, the adhesive applicator according to the present invention includes a supply nozzle capable of discharging the adhesive in an adhesive container, and a supply nozzle that sucks all the adhesive discharged from the supply nozzle into the adhesive container. The adhesive has a return nozzle that can be returned to the supply nozzle, and an adhesive flow space that allows the adhesive to flow in an exposed state between both nozzles. The adhesive can be applied to all objects to be coated.

Embodiments of the present invention will be described below with reference to all drawings.

FIG. 3 is a piping system diagram showing an adhesive coating device according to an embodiment of the present invention. A semi-sealed adhesive container 11 with an air hole contains starch glue 1 and synthetic glue.

Adhesives such as solvent-based adhesives can be stored. A supply nozzle 12 is inserted into the adhesive container 11 . The supply pipe 12 includes a conduit 13 and a switching valve 14.
．． The suction port of the supply pump 16 is connected through the pipe line 15ff. A cylindrical supply nozzle 18 is connected to the discharge port of the supply pump 16 via a conduit 17.

That is, under the operation of the supply pump 16, the supply nozzle 18 supplies the adhesive in the adhesive container 11 to its discharge port 18A.
It is possible to discharge from Here, the supply pump 16 is capable of discharging adhesive at a discharge flow rate that matches the required application amount of cement.

Further, the suction port 19A of the cylindrical return nozzle 19 is arranged with respect to the discharge port 18A of the supply nozzle 18 via the adhesive flow space s6.

In addition, in this embodiment, the return nozzle 19 is.

The supply nozzle 18 is coaxially arranged around the supply nozzle 18.

The return nozzle 19 is connected to the suction port of a return pump 21 through a pipe 20.The return pump 21 has a discharge port connected to a pipe 22, a switching valve 23, and a pipe 24. The return e-ve 25 inserted into the adhesive container 11
is connected).

That is, under the operation of the return pump 21, the return nozzle 19 is discharged from the discharge port 18A of the supply nozzle 18, flows out into the adhesive flow space S in an exposed state, and is formed into a spherical shape with a height H due to surface tension. The adhesive that has risen can be sucked in through the suction port 19A and returned to the adhesive container 11.

Here, the return pump 21 has an adhesive flow space S.
The operation is performed at a suction flow rate that allows the adhesive that has swelled up to some extent to be sucked into the return nozzle 19 while maintaining its swollen state to some extent. In addition, supply nozzle 1
8 and the return nozzle 19 also need to have a shape that allows the adhesive to flow while maintaining a certain degree of swelling in the adhesive flow space S.
It does not necessarily have to be coaxially arranged or cylindrical.

It is also possible to adopt various shapes shown in FIGS. 4 to 6. FIG. 4 (4) and (6) show the supply nozzle 31
is eccentrically inserted into the return nozzle 32, and the discharge port 31^, which opens at an angle with respect to the own axis of the supply nozzle 31, is inserted into the return nozzle 32 in an eccentric position. This is an example in which it is placed toward the mouth 32A. In FIG. 5(A), ■), the supply nozzle 41 and the return nozzle 42 are arranged in parallel, and the discharge port 41A and the suction port 42A, which are opened at an angle with respect to their own axes, are substantially opposed to each other. This is an example of the arrangement. FIGS. 6(4) and 6(B) show a supply nozzle 51 which is substantially the same as that shown in FIG. Discharge port 51A, return nozzle 52. This is an example in which a suction port 52Affi is formed. In addition, in order to transfer the adhesive smoothly and reliably from the supply nozzle 18 to the return nozzle 19, it is necessary to
(1) Return nozzle 19
The flow path area is larger than the flow path area of the total supply nozzle 18,
Alternatively, (2) the suction flow rate of the return pump 21 may be made larger than the discharge flow rate of the supply pump 16.

In addition, the opening 2 in the container 11 of the return/e-eve 25
5A, there is always a certain amount or more between the upper surface of the adhesive stored in the container 11 and the upper surface of the adhesive stored in the container 11 so that all the air discharged into the container 11 from the opening 25A does not enter into the adhesive stored in the container 11. It is possible to form a gap.

Furthermore, a supply nozzle 18 and a return nozzle 19
” are integrated with each other and can be moved toward and away from the object to be coated 26. In other words, the adhesive is discharged from the discharge port 18A of the supply nozzle 18 and raised as described above. As shown in FIG. 7(4), CB), when the agent is brought into contact with the coated surface of the coated article 26 by the supply nozzle 18 and return nozzle 19 approaching the coated article 26, The adhesive force between the adhesive and the surface to be coated overcomes the suction force of the return nozzle 19, and application to the target object 26 is immediately started.In addition, when applying the adhesive to the target object 26, , the suction operation of the return nozzle 19 by driving the return inlet 21 may be continued.

On the other hand, it may be stopped. Further, the object 26 to which the adhesive is applied
If the suction operation of the return nozzle 1 is to be continued during application to the return nozzle 1, as shown in FIG.
All the adhesive discharged from the supply nozzle 18 may be applied to the object to be coated 26 with the suction operation in step 9 being an idle operation, and the adhesive discharged from the supply nozzle 18 as shown in FIG. A part of the adhesive may be sucked in by the return nozzle 19, and the remaining part may be applied to the object to be coated 26.

In FIG. 3, reference numeral 61 is a cleaning liquid container, the supply chisel tube 62 of the cleaning liquid container 61 is connected to the switching valve 14 via a pipe 63, and the return vibro 4 is connected to a pipe 65. It is connected to the switching valve 23 via the switching valve 23. Water is used as the cleaning liquid stored in the cleaning liquid container 61 when the adhesive stored in the adhesive container 11 is starch glue or synthetic glue; A solvent is used when the adhesive is a solvent-based adhesive.

Next, the operation of the above embodiment will be explained.

Supply nozzle 18, return nozzle 19, and object to be coated 2
During non-application when the switching valve 14 and 6 are relatively apart from each other, the switching valve 14
．． 23 connects the conduit 13 and conduit 15, and conduit 22 and conduit 24, respectively, and the adhesive in the adhesive container 11 is supplied to the discharge port 18 of the supply nozzle 18 under the operation of the supply pump 16. 'A is also discharged into the adhesive flow space S. The adhesive that has flowed out into the adhesive flow space S in an exposed state is maintained in a swollen state to some extent due to its surface tension, and is sucked into the suction port 19A of the return nozzle 19 under the operation of the return pump 21. , and is returned to the adhesive container 11. That is, at this time of non-application, the adhesive in the adhesive container 11 is transferred to the adhesive container 11. Supply pump 16. Supply nozzle 1
8. Adhesive flow space S.

Return nozzle 19. Since the adhesive is circulated through the circulation system consisting of the return pump 21 and is only slightly exposed to air in the small area S of the adhesive flow space between the supply nozzle 18 and the return nozzle 19, it lasts for a long time. The viscosity is maintained, and hardening metal is not generated at the discharge port 18A of the supply nozzle 18 and the suction port 19A of the return nozzle 19 (the above-mentioned circulation state is maintained).

When applying the adhesive, the supply nozzle 18. The returning nozzle 19 and the object to be coated 26 come relatively close to each other, and at the same time the adhesive in a swollen state in the adhesive flow space S comes into contact with the object to be coated 26, the adhesive moves as shown in FIG. 7 (5). )
Or, immediately after the state of (g)) is reached, coating on the object to be coated 26 is started.

When the supply nozzle 18 and the return nozzle 19 are relatively separated from the object 26 again after the above-mentioned coating operation is completed, the adhesive being discharged from the supply nozzle 18 is forcibly transferred to the return nozzle 19. The coating on the object 26 is immediately stopped.

When changing the type of adhesive due to a change in the object being coated, or
At the end of the coating operation, proceed as follows: 63. The pipe line 22 and the pipe line 65 are connected, and the cleaning liquid stored in the cleaning liquid container 61 is supplied to the cleaning liquid container 61. under the operation of the supply pump 16 and the return pump 21. Supply pump 16. Supply nozzle 18. adhesive flow space S,
It is circulated through a circulation system consisting of the return nozzle 19 and the return pump 21, and the supply nozzle 18 and its piping system as well as the return nozzle 19 and its piping system can be cleaned reliably and easily.

According to the adhesive coating device according to the above embodiment, the following effects can be obtained. That is, (1) when the adhesive is not applied, the adhesive is constantly circulated and ready for application, and when the adhesive application starts, the supply nozzle 18 and the return nozzle 19 are brought close to the object 26 to be applied. The coating operation can be started immediately by just one step, and the supply nozzle 18 and the return nozzle 19 can be made very small and lightweight.
therefore.

Good responsiveness during high-speed coating, and good controllability of coating timing and coating range. Therefore, even adhesive gold having a relatively high viscosity can be stably applied. (2) The adhesive discharged from the supply nozzle 18 at the end of the coating work is forcibly sucked into the return nozzle 19 just by slightly separating the supply nozzle 18 and the return nozzle 19 from the object 26. There is no stringing phenomenon, and the controllability of application timing and application range is good. (8) By fully adjusting the operating flow rate of the supply pump 16, the total coating amount can be reliably and easily adjusted. Furthermore, if the flow rate of the supply pump 16 is constant, a constant amount of coating can be ensured regardless of the viscosity, and the controllability of the amount of coating can also be improved.

(4) After the application work is completed, the adhesive does not drip from the tips of the supply nozzle 18 and the return nozzle 19.
Moreover, the adhesive has good handling properties without curing after being left for a long time, and it is possible to immediately start operation in any case. (5) Cleaning of the supply nozzle 18 and the return nozzle 19 and their piping system is extremely efficient by circulating the cleaning liquid in these piping systems under the operation of the supply pump 16 and the return pump 21. This can be done easily and reliably.

FIGS. 8 and 9 are layout diagrams showing an example of application of the adhesive applicator according to the above embodiment to all label pasting methods.

Vacuum roll 71 Kid label 72 can be adsorbed, and each set of supply nozzle 18 and return nozzle 19
A plurality of sets of such coating devices are arranged so as to face the corresponding coating areas 72A to 72B of the label 72 with a predetermined gap therebetween in a direction perpendicular to the feeding direction of the label 72. Each coating device includes a cylinder device 73, an -i electric tube 74. Timer 75. It is equipped with a solenoid 76° switching valve 77. Each cylinder device 73 has a supply nozzle 18 and a return nozzle 19 integrated at the tip of its piston rod, and is reciprocated by pressurized air supplied from a pressure air source 78. It is possible to approach or separate the corresponding application areas of all labels 72.

That is, after a predetermined period of time when the bulb C conduit 74 of each coating device detects that the tip of the label 72 has completely passed through the corresponding coating area, the timer 75 switches the solenoid 76'kONL and the switching valve 77 to turn on the pressure air from the pressure air source 78. The supply nozzle 18 and return nozzle 19 are supplied to the first chamber 73A of all the cylinder devices 73, and the adhesive is brought close to the corresponding application area of all the labels 72 for a predetermined period of time when all passes of the end of the corresponding application area of the adhesive application device are detected. Afterwards, the timer 75 causes the solenoid 76t-OFFL to supply pressurized air from the pressurized air source 78 to the second chamber 73B of the cylinder device 73, thereby separating the supply nozzle 18 and the return nozzle 19 from the corresponding application area of the label 72. This completes the coating work. That is, each coating device arranged in a direction perpendicular to the feeding direction of the label 12 has its own cylinder device 73 . Phototube 74. timer 7
5゜renoid 76. Since the switching valve 77 is provided, it is possible to accurately apply adhesive only to the required area of the label 72, regardless of the overall size and shape of the label T2. Note that when the shape of the label 72 is rectangular, a single cylinder device, phototube, timer, and solenoid can simultaneously control the movement of each applicator toward and away from the label 72.

Therefore, the conventional adhesive applicator shown in Figure WJ1 has poor high-speed controllability and causes the stringing phenomenon described above, making it extremely difficult or impossible to apply it to labeling machines. However, according to the labeling method according to the application of the present invention, high-speed controllability is good and there is no stringing phenomenon, so it is possible to perform highly efficient and highly accurate labeling work. becomes.

In addition, when the coating apparatus according to the present invention is used for coating work of heat-melting adhesive, all parts through which the adhesive passes, such as the adhesive supply system and the return light, are completely heated.

It is necessary to maintain the entire molten state of the adhesive.

As mentioned above, the adhesive coating device related to Misfire 11JJ is as follows.

A supply nozzle that can discharge the adhesive in the adhesive container, a return nozzle that can suck the adhesive discharged from the supply nozzle and return it to the adhesive container, and expose the adhesive between both nozzles. The adhesive flow space is configured to allow the adhesive to flow in the supply nozzle, and the adhesive discharged from the supply nozzle can be applied to the entire object to be coated. Therefore, regardless of the viscosity of the adhesive, it is possible to control the timing of applying the adhesive, the application range, and the amount of application, as well as completely suppressing changes in the viscosity and hardening of the adhesive.
Even relatively high viscosity adhesives can be applied smoothly, and cleaning can be done easily.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing a conventional adhesive application device, and Figure 2 (
4) and (I3) are explanatory diagrams showing the state of coating work by the coating device shown in FIG. , FIG. 4 (4) and θ3), FIG. 5 (4) and (B), and FIG. 6 (A) and (B) are piping system diagrams showing the locations of the supply nozzle and return nozzle in the present invention, respectively. Explanatory diagram showing a modified example of the nozzle, Figure d57
B) is an explanatory diagram showing the state of coating work by the coating device shown in FIG. FIG. 11... Adhesive container, 18... Supply nozzle, 19
...Return nozzle, 26...Object to be coated, S...Adhesive flow space. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 2 (A) (B)

Claims (1)

[Claims] (1) A supply nozzle that can discharge the adhesive in the adhesive container, a return nozzle that can suck the adhesive discharged from the supply nozzle and return it to the adhesive container, and a an adhesive flow space that allows the adhesive to flow in a fully exposed state, and allows the adhesive flowing through the adhesive flow space discharged from a supply nozzle to be applied to an object to be coated; Device.