JPH1128403A - Adhesive coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive applying apparatus capable of applying an adhesive uniformly to a desired region around a cylindrical body while maintaining a stable and easy bonding quality while maintaining a stable bonding quality. . SOLUTION: An adhesive applying apparatus 10 includes a bathtub 11 for storing a liquid adhesive, and a groove 16 provided in the bathtub 11 so as to be vertically movable and into which an open end 1a of a tubular body 1 is inserted. And a middle mold 12 formed around the periphery. An electric heater 15 is provided in the bathtub 11 for heating the adhesive. A compression coil spring 14 is disposed below the middle mold 12 as an elastic member that urges the middle mold 12 upwardly, and a stopper that sets the lowest position of the middle mold 12 that moves up and down. 17 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive applying apparatus for uniformly applying an adhesive around a cylindrical object to be coated.

[0002]

2. Description of the Related Art Conventionally, in bonding a cylindrical container to a base portion such as an upper lid or a bottom lid, or bonding cylindrical bodies to each other, for example, as shown in FIG. After applying the liquid adhesive 3 around the cylindrical body 1, the bonding operation is performed by fitting the liquid adhesive 3 with the bottom cover 2 or the like in the direction of the arrow in the figure.

[0003] The adhesive 3 must be applied to the entire circumference of one of the cylindrical bodies 1 to be bonded as described above. Generally, a method of applying the adhesive uses a nozzle-shaped application gun (not shown). Have been.

The adhesive is heated to a predetermined temperature, and a liquid adhesive is discharged from the application gun toward the object while relatively moving the application gun and the object. . In this manner, the adhesive can be applied to the entire outer peripheral surface of the cylindrical body so as to draw a straight line.

[0005]

However, in the above-mentioned conventional method for applying an adhesive, it is sufficient that the cylindrical body to be coated has a simple shape such as a square tube. Is complicated with irregularities, complicated movements are required to relatively move the coating gun and the object to be coated while maintaining a constant distance, and the coating work requires There was a problem of increasing time. In particular, the application work is extremely difficult for the concave portions on the outer surface.

In addition, in the case of corrugated cardboard, a quick-drying hot-melt resin adhesive is often heated and melted and used for bonding. In such a case, working conditions such as temperature and bonding time are relatively limited. However, in the application by the application gun, there is a problem that the time difference between the start and the end of the application is large depending on the shape or size of the object to be coated, which causes a variation in the adhesive quality.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and it is an object of the present invention to provide a simple and quick method for maintaining a stable adhesive quality while maintaining a stable bonding quality. An object of the present invention is to provide an adhesive applying device capable of uniformly applying an adhesive to a desired area.

[0008]

According to a first aspect of the present invention, there is provided an adhesive applying apparatus for applying an adhesive around a cylindrical article to be coated, wherein a liquid adhesive is provided. It is characterized by having a bathtub for storing, and a holding portion provided in the bathtub so as to be vertically movable and having a groove formed around the opening into which the open end of the article to be coated is inserted. According to the present invention, the adhesive is easily and quickly applied to a desired area around the cylindrical body by only one step of setting the cylindrical object to be coated on the apparatus and immersing it in the adhesive in the bathtub. Uniformly applied. Here, since the open end of the object to be coated is inserted into the groove,
The adhesive is applied only to a predetermined area on the side surface of the object to be coated, which is located above the upper end of the groove, and furthermore, there is a case where the adhesive goes around the groove and reaches the inner surface of the cylindrical object to be coated. Be avoided.

According to a second aspect of the present invention, in the adhesive applying apparatus according to the first aspect, a stopper for setting a lowermost position of the holding portion is provided. According to the present invention, since the lowermost position of the vertically moving holding portion is regulated by the stopper, the upper limit of the adhesive application area is set. As a result, it is possible to suppress variations in the application amount for each product.

According to a third aspect of the present invention, there is provided the adhesive coating apparatus according to the first aspect, further comprising an elastic member for urging the holding portion upward. I do. In the present invention, after the application of the adhesive is completed, by releasing the pressing force for lowering the holding unit,
The object to be coated and the holding portion return to the upper initial position by the elastic force of the elastic member.

According to a fourth aspect of the present invention, there is provided the adhesive coating apparatus according to the first aspect, further comprising a guide member which contacts an outer surface of the holding portion and guides the holding portion to move up and down. It is characterized by having. According to the present invention, the holding portion slides when its outer surface comes into contact with the inner surface of the guide member, and can smoothly move up and down. During this period, the liquid sealing property is maintained.

According to a fifth aspect of the present invention, there is provided the adhesive applying apparatus according to the first aspect, further comprising a heater disposed in the bath tub to supply heat to the adhesive. . According to the present invention, the adhesive can be heated by the electric heater and the holding portion is also heated, so that the transfer is performed within a few seconds after the opening end of the cylindrical object is inserted into the groove. The object to be coated is also warmed by the heat effect,
The affinity between the adhesive and the tubular body is increased.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an adhesive application device according to one embodiment of the present invention.

An adhesive applying apparatus 10 shown in FIG. 1 is an apparatus for uniformly applying an adhesive 3 around a cylindrical body 1 as an object to be coated as shown in FIG. This adhesive application device 1
Reference numeral 0 denotes a bathtub 11 for storing the liquid adhesive 3, and a middle mold 12 (corresponding to a holding portion) provided in the bathtub 11 so as to be vertically movable. The tubular body 1 is made of, for example, paperboard. However, the present invention is not limited to this, and can be applied to other papers such as cardboard, resins, and metals.

The bathtub 11 has, as an outer frame of the bathtub, an outer side wall 11a forming a side surface and a bottom wall 11c forming a bottom surface.
2 is formed.

The space between the outer wall 11a and the inner wall 11b is filled with an appropriate amount of the liquid adhesive 3 and stored. In the present embodiment, a quick-drying hot-melt resin-based adhesive is used as the adhesive. This adhesive is, for example, about 170
It is melted and liquid by heating to a temperature of from 180C to 180C. To heat the adhesive, an electric heater 1 is placed in the bathtub 11.
5 are provided.

Since the outer surface of the middle mold 12 is slidable by contacting the outer surface with the inner surface of the inner wall 11b, smooth vertical movement is ensured. Liquid sealability is maintained between the inner surface of 11b. Therefore, the inner side wall 11b functions as a guide member for guiding the vertical movement of the middle die 12, and also functions as a partition wall for the adhesive. The upper end of the middle mold 12 is chamfered so that the cylindrical body 1 can be easily inserted from above.

The middle die 12 has an open end 1 of the cylindrical body 1.
A groove 16 into which a is inserted is formed around the groove.
Therefore, the shape of the groove 16 as viewed from above is the same as that of the cylindrical body 1.
Is formed so as to conform to the shape of the opening end portion 1a. The groove width of the groove 16 is set so as to match the thickness of the tubular body 1. However, the adjustment can be made by interposing a shim member.

The outer groove wall 16a of the groove 16 has an important function. That is, the height H of the outer groove wall 16a depends on the opening end 1 of the cylindrical body 11 to which the adhesive is not applied.
It has a function of masking the area from a. Therefore, the adhesive is applied to the groove 16 at the opening end 1a of the cylindrical body 1.
Is applied only to a predetermined region on the side surface of the tubular body 1 located above the upper end of the outer groove wall 16a. In addition, by securing the height H of the outer groove wall 16a, it is possible to reliably avoid a situation in which the adhesive wraps around the groove and reaches the inner surface of the tubular body 1. This eliminates the use of unnecessary adhesives and improves the appearance.

By adjusting the height of the outer groove wall 16a of the groove 16, it is possible to change the distance from the lower end 1a of the adhesive application area to the product manufactured by bonding. Can be matched to specifications.

FIGS. 2 and 3 are enlarged views of the outer groove wall according to another embodiment of the groove 16 as viewed from the outside in the horizontal direction. In the present invention, as shown in FIG. 2, the outer groove wall 16 a of the groove portion 16 can be formed in a comb shape by partially increasing the height. In this way, the adhesive can be applied intermittently instead of continuously. In the figure, "1"
“6b” indicates the groove bottom of the groove portion 16. Further, as shown in FIG. 3, an opening 16c may be formed in the outer groove wall 16a of the groove portion 16. By doing so, the opening 16c
There is an advantage that a predetermined amount of adhesive can be applied depending on the size of the adhesive.

Below the middle mold 12, a compression coil spring 1 as an elastic member for biasing the middle mold 12 upwardly is provided.
4 are arranged. By using the spring 14, the middle die 12 can be returned to the upper initial position with a simple configuration. The spring 14 is not limited to a compression coil spring, but may be, for example, a disc spring or the like.

A stopper 17 is provided below the middle mold 12 to set the lowest position of the middle mold 12 which moves up and down. By regulating the lowermost position of the middle mold 12 with the stopper 17, the upper limit of the adhesive application area can be set, and the variation in the application amount for each product can be suppressed. The stopper 17 is, as shown in FIG.
It is not always necessary to arrange the projections 18 on the inner side surface of the inner side wall 11b, as shown by a two-dot chain line in FIG. It is also possible to regulate the lowest position.

It is needless to say that, instead of using the spring 14 and the stopper 17, a structure in which the vertical movement of the middle mold 12 is controlled using a driving means such as a cylinder can be employed.

Next, the operation of the adhesive applying apparatus according to the present embodiment will be described. FIG. 4 is a view showing a state before the application of the adhesive, in which a cylindrical body as the object to be coated is set in the apparatus, and FIG. 5 is a view showing a state in which the middle mold is moved to the lowest position and the adhesive is applied. is there.

As shown in FIG. 4, when the adhesive 3 is applied around the cylindrical body 1 as an object to be coated using the present apparatus, first, the open end 1a of the cylindrical body 1 is The cylindrical body 1 is inserted downward into a groove 16 formed around the middle mold 12.
Is inserted. Next, the cylindrical body 1 is pushed downward so as to oppose the resilience of the spring 14, so that the middle mold 12 together with the cylindrical body 1 starts to move downward.

When the upper end of the outer groove wall 16a of the middle die 12 is immersed in the liquid adhesive in the bathtub 11, the adhesive flows and reaches the outer surface of the cylindrical body 1. The adhesive is
Since the open end 1a of the tubular body 1 is inserted into the groove 16, the coating is applied only to the side surface of the tubular body 1 located above the upper end of the outer groove wall 16a. Also, the height H of the outer groove wall 16a
Is ensured, so that the situation in which the adhesive goes around the inside of the groove and reaches the inner surface of the tubular body 1 is reliably avoided.

As shown in FIG. 5, when the lower surface of the middle die 12 comes into contact with the stopper 17, the downward movement of the middle die 12, ie, the cylindrical body 1, is stopped.

As a result, as shown in the figure, in the vicinity of the open end 1a of the tubular body 1, the adhesive is quickly applied to a predetermined area around the open end 1a. Here, in the present embodiment, a hot-melt resin-based adhesive is used, and the adhesive is heated by the electric heater 15.
Is also warm. Therefore, the opening end 1 of the cylindrical body 1
Since the cylindrical body 1 is warmed by the heat transfer effect within a few seconds after a is inserted into the groove 16, the affinity between the adhesive and the cylindrical body is increased, and the adhesive properties can be improved.

After the application of the adhesive is completed, the cylindrical body 1 and the middle mold 12 are released by releasing the pressing force on the cylindrical body 1.
The spring 14 returns to the upper initial position by the elastic force.

As described above, according to the present embodiment, only one step of setting the tubular body 1 in the apparatus and immersing the tubular body 1 in the adhesive in the bathtub 11 is a simple and quick method for surrounding the tubular body. The adhesive can be uniformly applied to the region to be formed. Since application can be performed in such a short time, it is possible to maintain stable adhesive quality without causing a time difference between the applied adhesive portions.

Further, since it can be applied by dipping in an adhesive in the bathtub 11, even if the object to be coated is a cylindrical body having an uneven cross section as shown in FIG. , And the operation of applying the adhesive can be easily performed.

The embodiments described above are not described to limit the present invention, and various modifications can be made.

For example, in the above-described embodiment, the case where the cylindrical body and the lid are bonded has been described. However, the present invention is not limited to such a case, and the cylindrical bodies are fitted together and bonded. Of course, it can be applied to such a case.

In the above-described embodiment, a hot-melt resin-based adhesive is used as the liquid adhesive, but any other adhesive such as a glue may be used in addition to a polyvinyl acetate-based adhesive. Is possible. When a water-soluble adhesive is used, the installation of the electric heater can be omitted.

[0036]

As described above, according to the present invention, the following effects can be obtained for each claim. According to the first aspect of the present invention, the adhesive can be easily and quickly applied to a desired area around the cylindrical body by only one step of setting the cylindrical object to be coated on the apparatus and immersing the object in the adhesive in the bathtub. Can be uniformly applied. Since application can be performed in such a short time, it is possible to maintain stable adhesive quality without causing a time difference between the applied adhesive portions. In addition, since it can be applied by dipping in an adhesive in a bathtub, even if the object to be coated is, for example, a cylindrical body having an uneven cross-sectional shape, the adhesive can be easily applied while maintaining the above advantages. A coating operation can be performed.

When the opening end of the object is inserted into the groove, it can be applied only to the side of the object positioned above the upper end of the groove, and the adhesive is applied to the inside of the groove. It is possible to reliably prevent a situation in which the material goes around and reaches the inner surface of the cylindrical object to be coated. This eliminates the use of unnecessary adhesives and improves the appearance. Furthermore, by adjusting the height of the outer groove wall of the groove, the distance from the lower end of the adhesive application area to the opening end can be changed, and can be adjusted to the specifications of the product manufactured by bonding. .

According to the second aspect of the present invention, the lowermost position of the vertically moving holding portion is regulated by the stopper, so that the upper limit of the adhesive application area can be set, and the application amount of each product varies. Can be suppressed.

According to the third aspect of the present invention, by using the elastic member, the holding portion can be returned to the upper initial position with a simple configuration.

According to the fourth aspect of the present invention, the guide member enables the holding portion to move up and down smoothly, and the outer surface of the holding portion and the inner surface of the guide member slide in contact with each other. Can also act as a partition wall for the adhesive due to the liquid sealing property.

According to the fifth aspect of the present invention, the adhesive can be heated by the electric heater and the holding portion is also heated, so that the opening end of the cylindrical object to be coated is inserted into the groove. In a few seconds, the object to be coated is warmed by the heat transfer effect, the affinity between the adhesive and the cylindrical body is increased, and the adhesive properties can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an adhesive application device according to an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment in which the height of the outer groove wall of the groove is partially increased to form a comb.

FIG. 3 is a view showing still another embodiment in which an opening is formed in an outer groove wall of a groove.

FIG. 4 is a view showing a state before the application of an adhesive in which a cylindrical body as an object to be coated is set in an apparatus.

FIG. 5 is a diagram showing a state in which a middle die is moved to a lowermost position and an adhesive is applied.

FIG. 6 is a perspective view showing a cylindrical body as an object to be coated having an uneven cross-sectional shape.

FIG. 7 is an exploded perspective view showing a state in which a liquid adhesive is applied around a cylindrical body as an object to be coated, fitted to a bottom cover, and adhered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylindrical body (substrate), 1a ... Open end part, 2 ... Bottom lid, 3 ... Adhesive, 10 ... Adhesive application apparatus, 11 ... Bathtub, 11a ... Outer wall, 11b ... Inner wall (guide member) ), 11c: bottom wall, 12: medium size (holding portion), 14: spring (elastic member), 15: heater, 16: groove portion, 16a: outer groove wall, 16b: groove bottom, 16c: opening, 17: stopper, 18. Projection (stopper).

Claims (5)

[Claims] An adhesive application device for applying an adhesive (3) around a cylindrical object (1), comprising: a bath (11) for storing a liquid adhesive (3); 11) a groove portion which is provided movably up and down and into which the open end portion (1a) of the object to be coated (1) is inserted
An adhesive applying device, characterized in that (16) has a holding portion (12) formed around the periphery. 2. The adhesive applying device according to claim 1, further comprising a stopper (17, 18) for setting a lowermost position of the holding portion (12). 3. An elastic member (14) for urging the holding portion (12) upwardly with respect to the holding portion (12).
The adhesive application device as described in the above. 4. The adhesive according to claim 1, further comprising a guide member (11b) for contacting an outer surface of the holding portion (12) and guiding the holding portion (12) to move up and down. Coating device. 5. The adhesive disposed in the bathtub (11).
The adhesive application device according to claim 1, further comprising a heater (15) for supplying heat to (3).