JPH0771657B2 - Adhesive stripe coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of coating a pressure-sensitive adhesive in a striped pattern on the surface of a base material such as release paper.

(Prior Art) Conventionally, not in the entire width of the base material such as release paper (though both ears are not usually coated), but in the longitudinal direction of the central part excluding both ears (base material). Processed paper coated with multiple strips of adhesive (or sizing) in the strip direction (in the feeding direction) is, for example, a material for multi-layer labels or a surface protective sheet for plate materials such as plastic molding plates and decorative plates, and is widely used in industrial fields. Widely used as a material.

In the past, as a method of coating a pressure-sensitive adhesive in a striped pattern on the surface of a base material such as release paper, for example, (a) in the case of coating using a reverse roll coater device, a comb-shaped blade was used for a measuring roll. By applying a doctor blade to scrape off the adhesive at the roll part where the tip of the comb blade of the blade strongly abuts, and sticking and holding a predetermined amount of the adhesive only at the roll part where the comb blade does not contact, resulting in The adhesive is applied in stripes on the base material surface (in other words,
A method of forming a striped uncoated portion) or (b) a large number of weir plates in the adhesive pan to prevent the adhesive (or glue) from coming out of the adhesive pan (also called glue reservoir) Insert it to prevent the adhesive from adhering to the part where the weir plate contacts the comma roll, and to adhere and retain the adhesive only to the part where the weir plate does not contact, so that the adhesive is applied in stripes. (In other words, there is a method of forming a striped uncoated portion).

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional technique, according to the method (a), a coated portion or an uncoated portion (dealing portion) of the pressure-sensitive adhesive (or glue) to be formed is formed. ), It is necessary to prepare doctor blades with various comb blade intervals according to the width, and depending on the coating speed, the uncoated part corresponding to the dimensional width of the comb blade of the doctor blade, that is, a constant width It is difficult to obtain a processing paper coated with a straight adhesive stripe in the form of a pressure sensitive adhesive, and it takes time and effort to prepare it, resulting in very poor work efficiency. In the method (b) as well, the width of the uncoated portion or the coated portion changed as the coating speed was increased, and the adhesive was applied in a stripe shape extending straight to a certain width. It has the drawback that processed paper is difficult to obtain.

(Means for Solving Problems) The present invention has been conceived in view of the above problems, and is a stripe shape that straightly extends to a certain width by using existing equipment for applicator rolls such as comma rolls as they are. It is an object of the present invention to provide a coating method capable of applying an adhesive and capable of supplying a product in which the coating width does not change even when the coating speed is increased and coating unevenness does not occur.

The configuration of the present invention will be described below.

That is, the place of the gist of the present invention is, in the method of applying an adhesive to the base material surface by the applicator roll, at an arbitrary interval at an approximately contact portion with the base material surface of the axial outer periphery of the applicator roll. A striped coating method of an adhesive, characterized in that an adhesive material is applied on the base material by applying an adhesive tape on the base material and blocking the coating ability at the adhesive tape application site. .

Here, a comma roll is preferably used as the applicator roll. This is a kind of knife coater in terms of classification, with a continuous groove in the form of an acute angle on its outer circumference in the axial direction.
The blade has an acute angle, and like the doctor knife, plays a role of adjusting the coating amount. Then, an adhesive tape having a small width is partially (in an arbitrary interval) attached in the axial direction at the cutting edge portion of the comma roll. As for the adhesive tape used, if the gap between the comma roll and the base material such as release paper is 50 μm, for example, the adhesive layer is 25 μm on the polyester film (25 μm).
The one provided with is used. Other than that, Teflon tape, paper adhesive tape, etc. can be applied, but in short, the total thickness is 50 μm, and it is sufficient if the gap can be partially closed. . Also, when the concentration of the adhesive used is 50%, the gap is 50 μm.
Empirically, the total thickness of the adhesive tape is empirically
If the thickness is less than 30 μm, glue will not adhere to the desizing part (uncoated part).
Since it is 10 g / m ² or more, the adhesive strength is relatively strong and it cannot be said that it is substantially a desizing portion.On the other hand, when it is 50 μm or more, it is not preferable because it hinders the gap adjustment at the time of paste coating. If the total thickness of the adhesive tape is within the range of 30 to 50 μm, the amount of glue applied to the desizing portion is 0 to 10 g / m ² , which is practically suitable as the desizing portion. . Further, the width of the adhesive tape may correspond to the width of the uncoated portion to be obtained, and the number of sticking to the comma roll is selected in accordance with the number of uncoated portions to be formed.

In addition to the paper material such as release paper, a non-woven fabric, a synthetic resin film, or other composite material can be appropriately selected and used as the base material depending on the use of the final product.

(Example) Next, the Example of the method of this invention is described based on an accompanying drawing.

First, FIG. 1 is a side view for explaining an apparatus for carrying out the method of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is an enlarged sectional view of the comma roll shown in FIG. 1 or 2.

In these drawings, reference numeral 1 is a coater roll, and 2 is a comma roll, for example, a length of 1400 mm and a diameter of 10
A roll having 0 mm roll on which the acute-angled groove portion 4 is linearly formed is used. Reference numeral 6 denotes an adhesive tape which is adhered to the cutting edge of the comma roll at a predetermined interval, and the adhering portion of the tape is substantially flush with the outer peripheral surface of the roll other than the groove. The coating amount of the pressure-sensitive adhesive on the base material 8 such as release paper is determined by adjusting the gap between the base material and the control. As described above, for example, the pressure-sensitive adhesive 50% emulsion system is used. Agent coating amount is 25 g / m ²
In this case, the gap is set to 50 μm, and the adhesive tape to be attached has a total tape thickness of 50 μm (polyester film (25
It is desirable to use a pressure-sensitive adhesive tape) having a thickness of 25 μm applied to one side of (μm). Further, the adhesive 5 is contained in an appropriate amount in a glue reservoir formed between the comma roll 2, the liquid receiving plate 3 and the dam plate 7.

In the apparatus thus constructed, the base material 8 such as release paper is fed to the coater roll 1 and the base material is coated with the adhesive material 5 at a normal coating speed of 40 m / min. , Only the release paper which is in contact with the part where the adhesive tape 6 is adhered is an uncoated part, and the adhesive 5 is applied only to the surface of the base material 8 which is in contact with the part where the adhesive tape is not adhered, and the coated part 10 ( Alternatively, a striped coated paper 9 was obtained in which the uncoated portion 11) was formed linearly with a constant width, the coating width was constant and did not change, and there was no coating unevenness. Also, coating was performed at 20 m / min, which is half the normal speed, but the same coated paper 9 was obtained.

Thus, practically, the above-mentioned striped coated paper can be made into a final product by simultaneously laminating another material such as high-quality paper on the release coated surface side on the pressure-sensitive adhesive coated surface side.

(Operation) Thus, according to the method of the present invention, as the coater roll rotates, the base material such as release paper attached to the coater roll is fed out, and at the same time, the adhesive in the glue reservoir is attached and held on the base material surface. The adhesion of the adhesive in the glue reservoir is hindered at the portion where the adhesive tape of comma roll is attached at the portion where the adhesive tape of comma roll is attached. Further, since the adhesion of the adhesive is not hindered at the portion where the adhesive tape does not exist, a predetermined amount of the adhesive is retained as it is on the base material, and as a result, striped coating is performed.

(Effects of the Invention) The method of the present invention configured as described above has the following effects.

(1) That is, according to the method of the present invention, the striped adhesive coating is performed by using an existing applicator roll facility such as comma roll, and by adhering an adhesive tape to a predetermined portion of the roll with an extremely simple device. It does not require any new auxiliary equipment.

(2) Moreover, according to the method of the present invention, the number of adhesive tapes to be attached to the comma roll, the width of the adhesive tapes, the interval between the adhesive tapes, and the like can be easily changed. It is possible to form a striped adhesive coated portion.

(3) Further, according to the method of the present invention, since the striped coating can be performed as a result only by the presence of the adhesive tape attached to the comma roll as described above,
There is an advantage that the manufacturing cost is also low.

(4) Further, according to the method of the present invention, even if the coating speed is increased, the adhesive coating with a predetermined width and a predetermined interval can be performed, which has the advantage of dramatically improving the coating efficiency.

[Brief description of drawings]

FIG. 1 is a side view for explaining an apparatus for carrying out the method of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is an enlarged sectional view of the comma roll shown in FIG. 1 or 2. 1 ... coater roll, 2 ... comma roll, 3 ... liquid receiving plate, 4 ... acute-angled groove, 5 ... adhesive, 6 ...
… Adhesive tape, 7 …… Weir board, 8 …… Base material, 9 …… Striped coated paper, 10 …… Coated part, 11 …… Uncoated part.

Claims (1)

[Claims] 1. A method for applying a pressure-sensitive adhesive to a base material surface by an applicator roll, wherein an adhesive tape is attached at a substantially contact portion on the outer circumference of the applicator roll in the axial direction with a substantial contact with the base material surface. A striped coating method for an adhesive, characterized in that the adhesive is applied on the base material by blocking the coating ability at the area where the adhesive tape is adhered.