KR20130134389A - Method for coating the release agent on the surface of the adhesive tape, and the gravure roll used by this method - Google Patents

Abstract

The present invention relates to a method of coating a release agent on the back side of an adhesive tape for improving the adhesion to the back side of an adhesive tape such as an adhesion tape reeled on a roll and/or an adhesion tape, an adhesive tape manufactured thereby, and a gravure roll used for manufacturing thereof. The adhesive tape according to the present invention is characterized in that an adhesive layer for adhesion is formed on the surface based on a film sheet, that a release agent is coated on the back side of the film sheet to form a release layer, and that the back side of the film sheet has a straight coated area (14) coated with the release agent continuously in the length direction of the film sheet and a straight uncoated area (12) uncoated with the release agent in the length direction of the film sheet, alternately and continuously. [Reference numerals] (AA) Longitudinal direction of film sheet;(BB) Release layer;(CC) Film sheet;(DD) Adhesive layer

Description

Back coating method of release material for improving back adhesion of adhesive tape and adhesive tape produced by this, gravure roll used for the production of the adhesive tape, and the gravure roll used by this method}

The present invention provides a method of coating a release agent on the back side of an 'adhesive tape' for improving adhesion to the back side of an 'adhesive tape', such as adhesive tapes and / or adhesive tapes wound on rolls, It relates to an adhesive tape, a gravure roll used in the production thereof.

Currently, adhesive tapes and / or adhesive tapes are used in various industrial sites and homes. In particular, tapes used in industrial sites are widely used for fixing structures, protecting equipments, protecting paint surfaces, and protecting glass surfaces.

Adhesive tapes are made and used in the form of rolls. The adhesive tape has an adhesive layer (or adhesive layer) coated with an adhesive material (adhesive or adhesive) on one side (upper surface) based on the film sheet (PE, PP, etc.) in the center, and the other side (back side) of the release agent. A release layer is formed by coating.

1 is a perspective view showing the structure of a conventional general adhesive tape.

Referring to FIG. 1, a typical adhesive tape has an adhesive layer formed on an upper surface thereof based on a film sheet in the center, and a release layer coated with a release agent on a rear surface of the film sheet so that a user can easily release the adhesive tape from a roll. Is formed. The release layer is intended to make the adhesive layer of the upper ply easily fall, that is, to improve the loosening property of the adhesive tape.

However, such a release layer may be applied to the object when the worker unwinds the tape, or the adhesive surface (or adhesive surface) of the tape overlaps with the release surface when the tape is attached to the surface. do. As a result, the adhesive force of the adhesive layer is weakened by the release property of the release-treated back surface, thereby causing a phenomenon that the adhesive surface (or the adhesive surface) falls. When the release layer formed in order to easily loosen the adhesive tape wound on the roll from the roll, the release layer acts as a factor that hinders adhesion.

 In particular, in the industrial field due to a weak adhesive force or adhesive force due to various working conditions, that is, wind, welding, contact with the workpiece, peeling of the tape occurs, it can not perform the role of the tape.

In order to solve the above problems, a method of weakening the release property of the back of the adhesive tape may be considered.If the release layer is made thinner than the conventional release layer and the release property is weakly manufactured, the unwinding property becomes very bad when the worker wants to use the tape. It is difficult to use because it is very difficult to unwind the tape, especially when the adhesive or adhesive applied to the adhesive or adhesive layer is detached to the back of the lower layer, there is a problem that often can not use the product. On the contrary, when the releasability of the back of the adhesive tape was high, the end of the adhesive tape wound on the roll was not attached to the roll, so it was not easily unwound and attached, so it was not inconvenient for reuse.

Therefore, there is a need for research and development of a new type of adhesive tape capable of maintaining the adhesiveness of the adhesive, while being easy to be unwound in the roll in the conventional adhesive tape, so that the operator can easily loosen.

The present invention is to achieve the above object, the object of the present invention is to improve the method of applying a release agent on the back of the film sheet, the adhesive surface (or adhesive surface) after the work while excellent in the unwinding when using the adhesive tape The present invention provides a tape having improved adhesion to the back surface of the tape.

In other words, the adhesive tape of the present invention is excellent in the unwinding property and also excellent in adhesiveness, and the adhesive tape is stably wound on the roll, and easily released when the adhesive tape is unrolled from the roll, and the adhesive tape is applied to other objects. When wound, the adhesiveness is excellent, and even when the adhesive tape is wound twice or more times, the first wound has excellent adhesion or adhesion between the back side of the adhesive tape and the adhesive side of the next adhesive tape wound. It is an object of the present invention to provide an adhesive tape and a method of applying a release agent to the back of the film sheet for producing such adhesive tape.

The object of the present invention is not limited to the above-mentioned object, and other objects which are not mentioned will be clearly understood from the following description.

The present invention is to solve the above problems, the adhesive tape of the present invention based on the film sheet is formed on the upper surface of the adhesive layer for adhesion, the backing of the film sheet is applied to the release agent is formed by the adhesive layer In the tape, the back surface of the film sheet has a straight application surface 14 coated with a releasing agent continuously in the longitudinal direction of the film sheet, and a straight non-coated surface 12 with no releasing agent applied continuously in the longitudinal direction of the film sheet. ) Are alternately formed continuously.

According to a preferred embodiment, the ratio of the width of the uncoated surface and the width of the coated surface has a ratio of 1: 15 to 30.

In the gravure roll applying the release agent to the back surface of the film sheet for improving the back adhesion of the adhesive tape of the present invention, the surface of the gravure roll has a flat engraved surface and a non-engraved surface alternately in the circumferential direction along the surface thereof. Repeatedly formed, the intaglio surface is 100 to 400mesh intaglio dot is uniformly and repeatedly formed, the non-engraved surface is characterized in that the intaglio dot is not formed.

According to a preferred embodiment, the ratio of the width of the non-engraved surface and the width of the engraved surface has a ratio of 1: 15 to 30.

As described above, in the adhesive tape of the present invention, the release agent is not applied to the entire back surface of the adhesive tape, but the straight (straight) non-coated surface is formed repeatedly at regular intervals in the longitudinal direction of the film sheet. As the adhesive layer of the upper ply is bonded to the uncoated surface of the lower ply in the adhesive tape, the adhesive tape can be maintained even if the adhesive tape is laminated in multiple layers, and the adhesive tape is stably attached even in the adhesive tape roll. To maintain adhesiveness.

In addition, due to the uncoated surface of the release layer in the adhesive tape, when the adhesive tape is initially released from the roll, the adhesive tape can be easily and easily released, thereby improving the loosening property.

Therefore, the adhesive tape of the present invention is expected to be able to be replaced by an improved product in various industrial sites where peeling of the tape occurs due to weak adhesive force due to high adhesiveness and high loosening improvement.

1 is a perspective view of a conventional general adhesive tape.
2 is a perspective view of an adhesive tape according to a preferred embodiment of the present invention.
Figure 3 is a perspective schematic view of a gravure roll used in the back coating method of the release agent for improving the back adhesion of the adhesive tape, according to a preferred embodiment of the present invention.
4 is a real picture of the gravure roll of FIG.
Figure 5 is a flow chart of the manufacturing method of the adhesive tape for improving the back adhesion of the present invention.

The back coating method for improving the back adhesion of the adhesive tape of the present invention basically does not apply a release agent to the entire back surface of the film sheet, but a straight coating surface in which the release agent is continuously applied in the longitudinal direction of the film sheet, and the film. The coating surface and the non-coating surface are divided into a straight non-coating surface to which the release agent is not applied continuously in the longitudinal direction of the sheet, so as to be formed alternately and repeatedly.

Release agents are generally used materials such as wax or silicon, and the adhesive layer may be a rubber-based, silicone-based adhesive in addition to the usual acrylic adhesive.

Adhesive tape is manufactured to apply adhesive to the entire surface of the film sheet (fabric film) made of synthetic resin to have an adhesive force, the fabric film is polypropylene (PP: Poly Propylene, or OPP: Oriented Poly Propylene), polyvinyl Chloride (Poly Vinyl Chloride), polyethylene (Poly Ethylene), polyester (Poly ester) and the like are mainly used. Among the materials of the fabric film, PP or OPP may be widely used as various adhesive tapes for packaging due to its transparent, glossy and excellent adhesive strength, tensile strength, and moisture resistance.

Hereinafter, with reference to the accompanying drawings will be described in more detail the back coating method for improving the back adhesion of the adhesive tape of the present invention, and the adhesive tape produced by the gravure roll used in the production thereof.

2 is a perspective view of an adhesive tape according to a preferred embodiment of the present invention.

Referring to FIG. 2, the adhesive tape of the present invention also has a structure in which an adhesive layer for adhesiveness is formed on an upper surface of a film sheet in the center as in the prior art, and a release layer coated with a releasing agent is formed on a rear surface of the film sheet. .

The adhesive tape of the present invention applies a new technique to the back surface of the film sheet to which the release material is applied, and does not form a release layer to which the release agent is applied to the entire surface, as shown in the related art. The coating surface 14 and the non-coating surface 12 are formed so that the application surface 14 and the non-coating surface 12 may be formed continuously alternately by dividing into the linear (linear) coating surface 14 and the non-coating surface 12 extended in a straight line direction.

In the adhesive tape of the present invention, since the release layer is divided into two parts (coating surface, non-coating surface), when the adhesive tape is adhered in two or more layers, the adhesive layer of the adhesive tape of the upper layer is the back of the lower layer (release layer). By adhering to the uncoated surface of), the adhesion of the adhesive tape is improved. In the past, the release material was generally applied to the back surface of the adhesive tape, so that when two or more layers of adhesives were laminated, the adhesive layer of the upper layer was attached to the release material of the lower layer, so that the adhesive was not properly attached, and thus the tape was peeled off. There was a problem. However, in the adhesive tape of the present invention, since the adhesive layer of the upper layer is attached to the uncoated surface to which the release material of the lower layer is not attached, the adhesive force can be more firmly improved, thereby improving the adhesiveness of the adhesive tape. For this same reason, the adhesive tape wound on the roll will also be excellent in adhesion.

Moreover, the adhesive tape of such a structure can also be said to be excellent in annealing property. If the adhesive surface of the adhesive tape wound on the roll is stronger than the release layer, the release property may be inferior. However, the adhesive tape of the present invention has relatively weak adhesiveness, and only partially adheres to the uncoated surface of the lower layer. The loosening property is also excellent.

In the present invention, the coated surface 14 and the non-coated surface 12 are formed in a straight line (straight line) in the longitudinal direction of the film sheet, as shown, because the application of the release material is made by the (gravure) roll. Although it is not a straight line, it is difficult to implement it by a roll even if it is intended to be manufactured in a variety of shapes such as a specific pattern, about rhombus, squares, circles, etc., and it is impossible to form a complete pattern because the release material has flowability. Therefore, as shown, it will be most preferable that the shape of the coated surface and the uncoated surface is formed in a straight line in the longitudinal direction of the film sheet.

Preferably, the width L2 of the uncoated surface and the width L1 of the coated surface have a ratio of 1:15 to 30. In the embodiment, more preferably 1mm width of the uncoated surface: 20mm width of the coated surface. If the width of the coated surface is too large, the reason for forming the coated surface will disappear and it will be difficult to solve the conventional problems.If the width of the coated surface is too small, the releasability is remarkably reduced after the production of the tape, and the adhesive surface is released when the tape is released. The risk of defects is high, such as the phenomenon that the adhesive is transferred by cohesive failure. Therefore, the type of release material, the viscosity of the release material, the release material coating time, etc. can be adjusted, but preferably the width (L2) of the uncoated surface and the width (L1) of the coated surface will have a ratio of 1: 15 ~ 30.

The adhesive tape of the above structure of the present invention is made by improving the structure of the gravure roll used in the release material coating process.

3 is a perspective schematic view of a gravure roll used in the back coating method of the release agent for improving the back adhesion of the adhesive tape according to a preferred embodiment of the present invention, Figure 4 is an actual picture of the gravure roll of FIG.

3 and 4, on the surface of the gravure roll, the negative and non-engraved surfaces extending in a straight line along the surface thereof are alternately formed. The intaglio surface 22 means a portion in which a negative dot of 100 to 400mesh is uniformly and repeatedly formed on the surface, and the non-engraved surface 24 means a portion in which the negative dot is not formed.

In the release material coating process, the intaglio surface 22 of the gravure roll will form the application surface 12 of the release layer of the adhesive tape, and the nonconcave surface 24 of the gravure roll is the uncoated surface 14 of the release layer of the adhesive tape. ). Since the engraved and non-engraved surfaces of the gravure roll are formed in a straight line along the circumferential direction, a straight coated surface and an uncoated surface are formed along the longitudinal direction of the film sheet of the adhesive tape despite the flowability of the release material.

Preferably, the ratio of the width L2 of the non-engraved surface of the gravure roll and the width of the engraved surface L1 has a ratio of 1:15 to 30. This is equal to the width in the release layer of the above-mentioned adhesive tape, because the release layer is formed by the gravure roll.

The term 'adhesive tape' of the present invention means not only 'adhesive tapes' but also 'adhesive tapes' of a general concept including 'adhesive tapes', and the technical idea of the present invention refers to all concepts such as adhesive tapes and adhesive tapes. Of course, it can be applied to the adhesive tape. 'Glue' is also used as a general concept including 'adhesive'.

Hereinafter, with reference to FIG. 5, the manufacturing method of the adhesive tape for back adhesion improvement of this invention is demonstrated.

First, the film mounting step (Un-winding process) is a step of mounting the film sheet wound on the roll to the tape manufacturing apparatus by a continuous process. The film sheet may be made of PVC film, PVC film, PP film, etc., and the thickness of the film sheet may be applied to various films from 0.03mm to 0.5mm.

Next, a printing process is a step of printing a desired pattern on the surface of the film sheet. Of course, this may be omitted if necessary. The ink that can be used in the printing process may generally use an ink or thinner that can be used for a polymer film. The drying rate can be adjusted according to the composition ratio of the thickener and the solvent (toluene, acetone, etc.). In general, the process can be installed in series to produce colors of 1 degree or 2 degrees or more.

Next, the release coating process (Release coating process) is a pattern for coating (releasing) the release agent against the back of the film sheet (meaning the opposite side relative to the film sheet when the adhesive coating surface is viewed from the top to the front of the film sheet) According to the invention, a back coat coating is carried out. That is, the intaglio surface 24, which is formed with uniform and repetitive intaglio dots of 100 to 400mesh on the surface, and the non-engraved surface 22, in which the intaglio dots are not formed, are alternately successively arranged in a linear manner along the surface in the circumferential direction. Using the formed gravure roll (see Figure 4) to coat the release agent on the back of the film sheet. The release agent used in the present invention may use a silicone-based and non-silicone-based. As the non-silicone series, wax may be used, and the like may be variously used such as PEEL OIL 1020, RA585S, RELEASE PP 25, and the like.

Next, the pressure sensitive adhesive coating process is a process of applying an adhesive to the upper surface of the film sheet (meaning a surface opposite to the surface on which the release layer is coated). The adhesive (adhesive) used in the present invention may be used, such as rubber, acrylic, silicone, rubber, SES, SEBS, SIS, BR, NR, etc. may be used, acrylic is generally EA (ethyl acrylate), BA ( butyl acrylate), etc. is a polymer synthesized as a base material, and may be synthesized by adding AA (acryl acid) for other functions. Silicone adhesives generally use silicone adhesives, and both additive and additive types may be used under crosslinking conditions.

Next, the prepared adhesive tape is dried in a drying chamber for a certain time, and then wound up to be aged and crosslinked. It is then cut to specification and then packaged to complete the product. Steps such as drying, winding, aging, cutting, packaging, etc. will be apparent to those skilled in the art as a process generally used in the manufacture of the adhesive tape, and thus description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied otherwise without departing from the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention, but are intended to be illustrative, and the scope of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.

10: adhesive tape
12: uncoated surface
14: coating surface
20: gravure roll
22: intaglio
24: non-engraved surface

Claims (5)

In the adhesive tape for forming an adhesive layer on the upper surface based on the film sheet, a release agent is applied to the back surface of the film sheet, the release layer is formed,
The back surface of the film sheet is alternately continuous with a straight coating surface 14 having a release agent applied continuously in the longitudinal direction of the film sheet, and a straight non-coating surface 12 having no release agent applied continuously in the longitudinal direction of the film sheet. Adhesive tape, characterized in that formed. The method of claim 1,
Adhesive tape, characterized in that the ratio of the width of the uncoated surface and the width of the coated surface has a ratio of 1: 15 to 30. In the gravure roll for applying a release agent to the back of the film sheet for improving the back adhesion of the adhesive tape,
On the surface of the gravure roll, a linear intaglio and a non-engraved surface are alternately repeatedly formed in the circumferential direction along the surface,
The intaglio surface is formed with a dot of the intaglio of 100 ~ 400mesh uniformly and repeatedly,
The non-engraved surface is a gravure roll, characterized in that the negative dot is not formed. The method of claim 1,
The ratio of the width of the non-engraved surface and the width of the intaglio surface is a gravure roll, characterized in that the ratio of 1: 15 to 30. In the back coating method of the release agent for improving the back adhesion of the adhesive tape,
Gravure roll formed by alternately repeating a straight intaglio surface 22 having a uniform and repetitive intaglio dot of circumferential direction in the circumferential direction and a straight non-intaglio surface 24 in which the intaglio dot is not formed. By applying a release agent to the back of the film sheet using (20),
The film sheet back surface of the adhesive tape 10 has a straight application surface 14 to which the release agent is applied continuously in the longitudinal direction of the film sheet, and a straight non-coating surface 12 to which the release agent is not applied continuously in the longitudinal direction of the film sheet. The back coating method of the mold release agent characterized by the above-mentioned.

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