JP4340882B2 - Nozzle drying prevention device - Google Patents

Description

  The present invention relates to a nozzle drying prevention device used to prevent the nozzle end of the dispenser device from drying when the dispenser device is on standby. The nozzle drying prevention device of the present invention is used, for example, in the field of using a volatile solvent-based adhesive dispenser device.

  When applying the above volatile solvent-based adhesive stably and continuously using a dispenser device, it is necessary to be careful not to dry the tip of the dispenser nozzle when the equipment is on standby after the application operation is completed. Therefore, a nozzle drying prevention device has been conventionally used. The nozzle drying prevention device is filled with a volatile solvent equivalent to the adhesive, and the nozzle tip is immersed in the filling solvent to prevent the nozzle end from drying.

However, according to the conventional apparatus, since the nozzle end is held in a state where the adhesive for the next shot in the nozzle and the filling solvent are in contact with each other, the following problems occur.
(1) Since the filling solvent is mixed with the adhesive for the next shot in the nozzle, the concentration of the adhesive is lowered, and as a result, the adhesive strength after application is lowered.
(2) Since the adhesive dissolves in the filling solvent in the nozzle drying prevention device every time continuous application is repeated, the concentration of the filling solvent rises. As a result, it becomes impossible to clean the nozzle with the filling solvent. The solid content of the adhesive may be deposited. It is desirable that the nozzle drying prevention device can maintain the cleanliness of the nozzle outer cylinder part appropriately.
(3) The filling amount of the filling solvent gradually decreases due to its volatility characteristics. Therefore, since it affects the surrounding work environment, a countermeasure against volatilization may be required.

  Another object of the present invention is to prevent the adhesive injection nozzle from drying and to quickly restart the use of the injection nozzle. An anti-drying device comprising a sponge body that can be freely contacted and a water supply device for wetting the sponge body has been proposed (see Patent Document 1).

  However, according to this prior art, although the initial operation is good, the nozzle end breaks the sponge body as the operation is repeated, and the effect is diminished. An abnormal situation of contamination (contamination) may occur.

JP-A-5-23629

In view of the above points, the present invention can suppress contact between the adhesive for the next shot in the nozzle and the filling solvent in the container, and can clean the nozzle end with the solvent . An object of the present invention is to provide a nozzle drying prevention device that does not cause a problem. In addition, an object of the present invention is to provide a nozzle drying prevention device that can effectively prevent the solvent in the container from volatilizing.

In order to achieve the above object, a nozzle dry prevention device according to claim 1 of the present invention is a nozzle dry prevention device that suppresses drying of a nozzle end in a dispenser device, and is provided with a hole for inserting the nozzle end. a container filled with solvent therein with, disposed below the hole, and the nozzle contacting member downward movement is pushed by the nozzle end to be inserted from the hole, elastically supported by the nozzle contact member And a movable support for returning the nozzle contact member upward, the nozzle contact member having a protrusion inserted into the hole from below, and the nozzle end is inserted into the hole. The nozzle contact member closes the hole by inserting the protrusion into the hole, and the nozzle contact member is inserted when the nozzle end is inserted into the hole. Le end is immersed in the solvent by being inserted deep into the hole by pressing the nozzle contact member from being closed tip opening contacts the protruding portion, and characterized in that it is held in this state To do.

As in the nozzle drying prevention apparatus according to the first aspect of the present invention having the above-described configuration, the nozzle end inserted from the hole of the container comes into contact with the protrusion of the nozzle contact member and closes the tip opening to close the inside of the container. Once immersed in the solvent, the distal opening of the already nozzle end when the nozzle end is immersed in a solvent because it is closed, contact with solvent in the following shots adhesive and the container in the nozzle It becomes possible to suppress this. Nozzle end from being immersed in the solvent, it is possible to clean the nozzle end in a solvent, since it does not use a sponge member, not generated the problem of dissimilar material contamination.

Further, since the nozzle end has a small diameter, the hole of the container into which the nozzle is inserted may have a small opening cross-sectional area. Therefore, the container can be a substantially sealed container, and accordingly, the volatilization of the solvent can be reduced. In addition, when the nozzle end is not inserted into the hole, the nozzle contact member closes the hole by inserting the protrusion into the hole, so that the volatilization of the solvent can be further reduced. .

  The present invention has the following effects.

That is, in the nozzle drying prevention apparatus according to the first aspect of the present invention, the nozzle end inserted from the hole of the container comes into contact with the protrusion of the nozzle contact member and closes the tip opening, and is then immersed in the solvent in the container. Therefore, when the nozzle end is immersed in the solvent , the tip opening of the nozzle end is already closed, so that it is possible to suppress contact between the adhesive in the next shot in the nozzle and the solvent in the container. Has been. Therefore, it is possible to prevent the concentration of the adhesive from being lowered by mixing the solvent with the adhesive for the next shot in the nozzle, or the concentration of the solvent from being increased by dissolving the adhesive in the solvent in the container. be able to. The nozzle end can be washed nozzle end in the solvent from being immersed in a solvent, a problem of the dissimilar mixed from not using a sponge member does not occur. When the opening cross-sectional area of the hole is small, there is an effect of suppressing solvent volatilization.

In addition to this, when the nozzle end is not inserted into the hole, the nozzle contact member closes the hole by inserting the protrusion into the hole, so that the container is sealed at this time. Therefore, the further solvent volatilization suppression effect can be exhibited.

  The present application includes the following embodiments.

Constitution···
1. After the coating operation is completed, the coating device moves the dispenser nozzle to the nozzle drying prevention device.
2. At the start of the coating operation, the coating operation is started after moving from the nozzle drying prevention device.
3. The nozzle drying prevention device has the following constituent elements.
a. Put the equivalent of the solvent used in the adhesive into the covered container. For example, when the adhesive is an acid-modified polyolefin + polyolefin (both resin powders) using xylene, the container is filled with xylene as a solvent.
b. The lid is provided with a hole that allows the nozzle to pass through.
c. The nozzle contact member is made of a material that does not scrape or change its strength with a solvent even when the metal nozzle comes into contact. As a material, polyacetal (POM) excellent in wear resistance and chemical resistance is particularly preferable, and in addition, fluororesin, polytetrafluoroethylene (PTFE), and the like are also preferable.
d. A movable support designed so that the nozzle contact member can always come into contact with the nozzle is placed in a container while being immersed in a solvent together with the nozzle contact member.
e. The positional relationship between the liquid level of the solvent and the upper surface of the nozzle contact member is particularly important and satisfies the following.
A) When the nozzle is not moving down, the upper surface of the nozzle contact member is above the liquid level.
B) When the nozzle is moving down, the liquid level is higher than the upper surface of the nozzle contact member.
f. The nozzle pushes down the nozzle contact member, and the tip of the nozzle is completely immersed in the solvent.
g. The nozzle tip is sealed and the nozzle tip outer cylinder is washed with a solvent.
h. Regarding the volatilization of the solvent, a considerable effect can be expected by the size of the nozzle passage hole of the lidded container, but an opening / closing mechanism may be provided in the nozzle passage hole. Further, a protrusion may be provided on the upper surface of the nozzle contact member, and the volatilization of the solvent may be suppressed by the protrusion being in surface contact or line contact with the nozzle passage hole.
Effect ...
According to the above configuration, a desired application can be achieved with a stable application amount by preventing the adhesive from solidifying at the nozzle tip while keeping the tip of the nozzle clean, without causing foreign material contamination (contamination) in the application part. Shapes and patterns can be obtained. And all the problems in the prior art described above can be solved.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a cross section of a nozzle drying prevention apparatus 1 according to an embodiment of the present invention. The nozzle drying prevention apparatus 1 according to this embodiment is used in combination with an adhesive dispenser apparatus using a volatile solvent-based adhesive as a coating agent, and is configured as follows.

  That is, first, a container 2 is formed by combining a bottomed cylindrical container body 3 with a lid 4, and a piston 5 as a nozzle contact member and a coil spring 6 as a movable support are provided inside the container 2. Inserted and filled with solvent 7.

  The piston 5 is movable in the vertical direction within the container 2 and is elastically biased upward by a coil spring 6. The initial movement position of the piston 5 abuts against the lid 4 as shown in the figure to stop the movement. This is the upper limit position of the stroke.

  A through hole 4a for inserting the nozzle end 12 of the dispenser nozzle 11 from above is provided in the center of the flat surface of the lid 4. The size of the hole 4a may be small because the nozzle end 12 has a small diameter.

  The piston 5 has a disc-shaped main body portion 5a, and a shaft portion 5b that is inserted into the inner periphery of the coil spring 6 and maintains the posture of the piston 5 at the center of the lower surface of the disc-shaped main body portion 5a. Is provided. Further, a protrusion 5c is provided at the center of the upper surface of the disc-shaped main body 5a so as to be inserted into the hole 4a of the lid 4 from below, and this protrusion 5c is inserted into the hole 4a as shown in the figure. When this is done, the holes 4a are closed by the projections 5c.

  As shown in an enlarged view in FIG. 3, the protrusion 5c has a tapered peripheral surface 5d so that it can be easily inserted into the hole 4c. Further, since the nozzle end 12 is pressed against the protruding portion 5c from above, the protruding portion 5c has a planar shape so that the protruding portion 5c can block the tip opening 12a of the nozzle end 12 pressed at this time. It has a top surface 5e. Accordingly, the protrusion 5c is generally formed in a truncated cone shape. When the piston 5 is in contact with the lid 4 and is at the upper limit position of the stroke, the projection 5c closes the hole 4a as described above. At this time, the top surface 5e of the projection 5c is the hole 4a. The height dimension h of the protrusion 5c is set so as to protrude upward.

  When the type of the coating agent in the nozzle 11 is an acid-modified polyolefin + polyolefin (both resin powders) using xylene, the same type of xylene is injected and filled into the container 2 as the filling solvent 7. The injection amount is the total capacity of the container 2.

  The material of the piston 5 is preferably a material that does not scrape even when the metal nozzle 11 is repeatedly contacted, and that does not change in strength even when contacted with the solvent 7. From this viewpoint, polyacetal is preferable. (POM), fluororesin or polytetrafluoroethylene (PTFE) are suitable.

  Next, the operation of the nozzle drying preventing apparatus 1 having the above configuration will be described.

  FIG. 1 shows a state before the nozzle end 12 is inserted into the nozzle drying prevention device 1. In this state, the protrusion 5 c provided on the upper surface of the piston 5 closes the hole 4 a provided in the lid 4. is doing. Therefore, the container 2 is in a sealed state, and the volatilization of the solvent 7 is suppressed.

  Next, as shown in FIG. 2, when the nozzle 11 is lowered to insert the nozzle end 12 into the hole 4a of the lid body 4, the nozzle end 12 comes into contact with the protrusion 5c of the piston 5 protruding from the hole 4a, The projection 5c is pressed as it is, and the piston 5 is pushed down against the elasticity of the coil spring 6, and in this state, it is held during standby.

  During this action, when the nozzle end 12 comes into contact with the protruding portion 5c, the tip opening 12a is closed by the flat top surface 5e of the protruding portion 5c. 7, the adhesive for the next shot in the nozzle 11 and the solvent 7 in the container 2 are not in direct contact with each other. Therefore, the solvent 7 is mixed with the adhesive for the next shot in the nozzle 11 to reduce the concentration of the adhesive, or the adhesive dissolves into the solvent 7 in the container 2 to increase the concentration of the solvent 7. It is possible to prevent inconvenience from occurring.

  As shown in FIG. 3, the nozzle end 12 is immersed in the solvent 7 during standby. Therefore, the nozzle end 12 can be cleaned with the solvent 7.

  In addition, the device 1 does not have a sponge body as a conventional component. Therefore, it is possible to prevent the problem of mixing different materials due to the broken pieces of the sponge.

  The hole 4a has a small opening cross-sectional area and is closed from the inside of the container 2 by the protrusion 5c of the piston 5 when the nozzle end 12 is not inserted. Therefore, volatilization of the solvent 7 in the container 2 can be effectively suppressed.

  When the nozzle end 12 is pulled out from the device 1, the piston 5 returns upward due to the elasticity of the coil spring 6 and returns to the state shown in FIG.

Sectional drawing of the nozzle drying prevention apparatus which concerns on the Example of this invention. Sectional drawing which shows the operating state of the nozzle drying prevention apparatus Enlarged sectional view of the main part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle drying prevention apparatus 2 Container 3 Container main body 4 Cover body 4a Hole part 5 Piston (nozzle contact member)
5a Body 5b Shaft 5c Projection 5d Peripheral surface 5e Top surface 6 Coil spring (movable support)
7 Solvent 11 Dispenser nozzle 12 Nozzle end 12a Tip opening

Claims (1)

A nozzle drying prevention device (1) for suppressing drying of a nozzle end (12) in a dispenser device,
A hole (4a) for inserting the nozzle end (12) is provided and a container (2) filled with a solvent (7) is disposed therein, and the hole (4a) is disposed below the hole (4a). said nozzle end (12) a nozzle contacting member downward movement is pushed in (5), wherein the nozzle contact member (5) resiliently support and return movement of the nozzle contact member (5) upwards to insert the A movable support (6)
The nozzle contact member (5) has a protrusion (5c) inserted into the hole (4a) from below,
When the nozzle end (12) is not inserted into the hole (4a), the nozzle contact member (5) is inserted into the hole (4a) by inserting the protrusion (5c) into the hole (4a). 4a) is blocked,
When the nozzle end (12) is inserted into the hole (4a), the nozzle end (12) contacts the projection (5c ) and closes the tip opening (12a), and then the nozzle contact member. (5) it is immersed in said solvent (7) by deep be inserted into the hole portion by pressing (4a) the nozzle drying prevention device, characterized in that it is held in this state.

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