JPS634536Y2 - - Google Patents

Description

[Detailed description of the invention] This invention allows the solvent-free adhesive supplied between the first roll and the second roll to pass through a plurality of rolls to the first roll.
The present invention relates to an improvement in an adhesive supply device in a solvent-free laminating device for coating a web.

Usually, an adhesive supply device used in a solvent-free laminating apparatus has a structure as shown in FIG. The adhesive is discharged toward the center of the nip between the first roll 2 and the second roll 3, forming an adhesive pool 4 between the rolls,
A so-called roll coater method is adopted in which the adhesive in the adhesive pool 4 is transferred onto the first web 6 surface by the third roll 5 by forced rotation of a plurality of rolls that are continuously combined including this type of roll. It is well known that

However, most of the solvent-free adhesives used in this type of equipment are polyurethane-based adhesives, which have a relatively fast curing speed. In the third roll, only on the transfer surface corresponding to the so-called web width, which is in direct contact with the first web surface, a good exchange of old and new adhesive is ensured with approximately no excess or deficiency. In the so-called dead spaces 7 on both sides of the rolls that are not in contact with each other, as the rollers rotate, a phenomenon of liquid pooling of adhesive that is not transferred occurs, and as time passes, the adhered adhesive absorbs moisture in the atmosphere, etc. This resulted in extremely unfavorable conditions such as increased viscosity, gelation, hardening and deposition.

In other words, the adhesive supplied between the rollers is
As the roller is forced to rotate, it always tends to move, extend, and spread toward both sides of the roller, and even if adhesive is supplied from both sides of the roller, it will not move toward the center of the roller. The liquid exhibits the property of further moving, extending, and expanding in both side directions, and in conventional devices of this type, a liquid accumulation phenomenon always occurred on the dead space.

Therefore, especially when using a two-component type adhesive, this problem becomes extremely serious because its pot life hardens in an extremely short time of 15 minutes to 1 hour. or roll seizure phenomenon may occur.
At times, there was a risk of causing an unexpected accident.

Of course, conventional solutions to this problem include coating the dead space with a certain type of chemical to inhibit or inhibit curing, or removing it by peeling it off after curing. are prepared each time in the first roll 2,
However, these methods were extremely problematic because they required time and effort, and also led to an increase in the number of parts of the device itself. .

Therefore, the purpose of this invention is that even if so-called dead spaces occur on both sides of the rolls due to the relationship with the web width, the adhesive itself supplied between the rolls will move into the so-called dead spaces as the rolls rotate. extend, expand,
This is a solvent-free laminate that completely prevents undesirable phenomena such as curing and deposition, and allows the adhesive coating thickness on the roll surface to be kept uniform at all times, roughly depending on the web width. The present invention aims to provide a device for stably supplying adhesive in an apparatus.

The feature is that the adhesive is used in a solvent-free laminating machine that applies the solvent-free adhesive supplied by an adhesive supply nozzle between the first roll and the second roll to the first web via multiple rolls. In this feeding device, screw bars are provided at both ends in opposite directions and the thread pitch gradually decreases from the ends to the center, and the screw bars are inserted into the adhesive pool between the first roll and the second roll. is arranged so that it can be forcibly rotated in parallel with both rolls,
Further, a pair of adhesive supply nozzles are slidably arranged in accordance with the web width on guide bars extending from both end positions in the axial direction of the roll toward the center.

A specific embodiment will be described below with reference to the drawings. In FIGS. 3 and 4, 8 has screw grooves 9a and 9 extending in opposite directions from both ends to the center.
It is a screwer with a mark b engraved thereon, and is arranged so as to be forcedly rotatable in parallel with both rolls 2 and 3 in the adhesive pool 4 between the first roll 2 and the second roll 3. Further, 10a and 10b are adhesive supply nozzles arranged at both ends in the axial direction with respect to the adhesive reservoir 4, and in particular in this embodiment, on the guide bar A extending from both ends in the axial direction toward the center. It is arranged so that it can slide according to the web width.

Therefore, the adhesive supply positions of the adhesive supply nozzles 10a and 10b can be adjusted according to the web width, and since the screw pitch of the screw bar 8 decreases toward the center, the adhesive supply nozzles 1
The solvent-free adhesive supplied from 0a and 10b is
Initially, by forced rotation of the screw bar 8, which has spiral grooves in opposite directions depending on the web width,
It moves on the nip between the first roll 2 and the second roll 3 toward the center position of the rolls in the axial direction, and forms an adhesive pool 4 over an area corresponding to the web width.

Next, as the roll and screw bar 8 rotate, the adhesive that has formed the adhesive pool is transferred to the first web 6 via the second roll 3 or the third roll 4 according to the width of the web. Around this time, new adhesive is supplied again to adhesive reservoir 4.
In the adhesive reservoir 4, new and old adhesives are constantly being exchanged.
When the load is most stable, the adhesive quantity distribution in the adhesive reservoir 4 maintains a tendency to gradually increase from both ends toward the center under the condition of replacing old and new rolls, and from the second roll 3 to the third roll When reaching the roll 4 and transferring to the first web 6, the adhesive provides a uniform coating thickness depending on a predetermined web width.

In other words, in view of the fact that the adhesive in the adhesive reservoir 4 tends to flow toward both sides of the roll as the roll rotates and quickly spread between adjacent rolls, first, the adhesive supply nozzle is made variable. At the same time, the volume distribution of the adhesive reservoir 4 is adjusted as appropriate by rotating the screw bar 8 so as to offset this tendency.

In particular, when a dead space is significantly generated on the surface of the third roll 5 due to the relationship with the web width, increasing the rotational speed of the screwer 8 narrows the distribution of adhesive in the adhesive pool 4, allowing the adhesive to flow into the dead space and transfer. The amount of the agent is extremely small, and a uniform coating thickness is ensured only on the substantial transfer surface corresponding to the web width.

Furthermore, even if a solvent-free adhesive whose viscosity increases over time is used, the third roll 5, it is possible to ensure a constant uniform coating state.

By the way, the screwer 8 according to this embodiment
Although the spiral groove is generally carved over the entire bar, it is also possible to carve it only at both ends, for example. In other words, in this case, the supply of adhesive to the so-called central region of the adhesive reservoir corresponding to the non-threaded region of the scriber is achieved by the screw grooves formed at both ends directing the flow of adhesive at both ends. This is achieved by forcing the flow into the central region in a chained manner, and by adjusting the rotation of the screw bar, it can have the same effect as the screw bar described above, in which the entire bar is a spiral groove. It is.

Of course, from this point of view, the screw bar is not limited to one in which a screw groove is carved throughout the entire bar and at both ends.

It is desirable that the thread pitch of the screw bar has a structure that does not leak into the dead space, so the thread pitch gradually decreases toward the center of the bar.In short, by adjusting the rotation of the screw bar, the adhesive moves in the direction of the roll axis. - It is desirable to have a structure that allows supply to be freely converted from a quantitative standpoint.

In addition, in this embodiment, the supply position is made variable and is slid on the guide bar according to the web width, so that both the rotation of the roll and the rotation of the screw bar, which reduces the screw pit, are affected. In addition, a new adjustment element has been added, for example, even when coating an extremely short web with an extremely long roll.
It can be carried out satisfactorily and effectively.

In the embodiments described above, the number of rolls is the number of rolls generally used in this type of device, but it goes without saying that the number is not limited to this number. There is no problem in combination as long as the number of rolls can be applied to the first web.

As described above, the stable adhesive supply device in the solvent-free laminating device according to this invention is the first one.
In an adhesive supply device in a solvent-free laminating machine that coats a first web with a solvent-free adhesive supplied by an adhesive supply nozzle between a roll and a second roll via a plurality of rolls, a A screw bar is provided in the opposite direction and the screw pitch gradually decreases from the end toward the center, and this screw bar is forcibly rotated in the adhesive pool between the first roll and the second roll in parallel with both rolls. A pair of adhesive supply nozzles are arranged so as to be movable, and a pair of adhesive supply nozzles are arranged so as to be slidable according to the web width on a guide bar extending from both end positions in the axial direction of the roll toward the center. Even if so-called dead spaces occur on both sides of the rolls due to the relationship between the web widths, the adhesive itself supplied between the rolls will move into the so-called dead spaces as the rolls rotate, elongate, spread, harden, and accumulate. This was done to completely prevent the phenomenon.

Therefore, it is possible to apply adhesive on the roll surface without using conventional methods such as applying a certain kind of chemicals or preparing various rolls according to the web width and replacing them each time. The thickness can be stably maintained in a uniform state at all times, and various undesirable conditions caused by liquid accumulation in dead spaces can be completely eliminated.

Furthermore, by adjusting the rotation of the screw bar, it was possible to stably maintain a uniform coating thickness only on the transfer surface of the roll that roughly corresponds to the web width. It is now possible to exhibit the same effect even with adhesives whose viscosity increases over time, and provides a highly practical stable adhesive supply device for solvent-free laminating equipment. That's what I got.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an example of an adhesive supply device in a conventional solvent-free laminating device, FIG. 2 is a front view of the same, and FIG. 3 is a schematic side view showing an example of an adhesive supply device in a conventional solvent-free laminating device. FIG. 4 is a schematic side view showing one embodiment of the stable supply device, and FIG. 4 is a front view thereof. 2...first roll, 3...second roll, 4...
Adhesive reservoir, 8...Screw bar, 9a, 9b
... Spiral groove, A... Guide bar.

Claims (1)

[Scope of utility model registration request] In an adhesive supply device in a solvent-free laminating apparatus that applies a solvent-free adhesive supplied by an adhesive supply nozzle between a first roll and a second roll to a first web via a plurality of rolls, both ends are provided with screw bars in mutually opposite directions and whose thread pitch gradually decreases from the ends toward the center,
The screw bar is arranged so as to be forcedly rotatable in parallel with both rolls in the adhesive pool between the first roll and the second roll, and the pair of adhesive supply nozzles are arranged in the center from both end positions in the axial direction of the rolls. 1. A device for stably supplying adhesive in a solvent-free laminating apparatus, characterized in that the device is slidably arranged on a guide bar extending in the direction of the web according to the width of the web.