KR19990022919A - Adhesive Tape and Manufacturing Method Thereof - Google Patents

Abstract

The present invention provides for the manufacture of a removable closing or fixing adhesive tape comprising a strip-shaped carrier 1 coated with a self adhesive 2 on an active area at least in contact with the opposing face 7 during use of the adhesive tape. It relates to a method and such an adhesive tape. Several methods have been proposed to improve the production of adhesive tapes, and according to one of them, in a first step the active area is covered with a self adhesive 2 forming a continuous layer and in the second step a total effective adhesion. A non-bonded or less glued separation pattern 4 is printed on the self adhesive layer to reduce the area.

Description

Adhesive Tape and Manufacturing Method Thereof

In many applications, such adhesive tapes must solve two opposing challenges. That is, the adhesive tape must have a sufficiently high adhesion already guaranteed by lightly pressing the adhesive tape against the non-uniform surface, and must be able to repeatedly peel off the adhesive tape from the surface to open it without destroying the opposing surface. do. The latter mentioned task is particularly difficult to solve in the case where the opposing surface consists of a thin plastic foil, a sensitive fabric, etc., in which the adhesive tape is pressed together with a releasable area. This problem arises in particular in disposable diapers which are wrapped around the outer surface of the diaper with a waterproof plastic foil which must be made as thin as possible in order to improve the wearing comfort as well as in terms of cost. Adhesive tabs used for such disposable diapers should be opened repeatedly for inspection of the diaper and for modification of diaper consistency. High adhesion is welcome to ensure diaper closure, but easily results in the destruction of the thin cover foil of the diaper when peeling off the adhesive tape.

An extensive discussion of these problems can be found, for example, in Canadian Patent 1 239 752. Suggestions for solving these problems can be found in European Patent No. 0 269 713 E1, European Patent No. 0 321 234 B1, US Patent No. 4,067,337, US Patent No. 4,210,144 or PCT Application PCT / US92 / 08950 (WO 93/07845). Can be seen from EP 0 269 713 B1 shows in particular an adhesive tape designed for the closure receptor in FIG. 6, in which the removable area is provided with an adhesive pattern consisting only of thin lines.

The adhesive tape portion designed to be as firmly and non-removably fixed to the opposite side as possible comprises a complete cover, ie a continuous adhesive layer on its surface, but only from the opposite side, as there is no adhesive at the opposite end of the adhesive tape. A strap that can be grasped by a user is formed to lift a portion covered with the adhesive pattern.

German patent 4 202 704 C2 is also recognized as appropriate. A fixing tab for a diaper having a flat carrier coated on one side with a discontinuous adhesive segment made of self adhesive is disclosed, wherein at least the adhesive portion is designed to adhere to the second diaper portion during use, whereby the self adhesive is self-adhesive. Fixing tabs formed by coating with adhesive have an adhesive force including a defined value of peel resistance to the outer foil of the diaper, and can be detached from the outer foil several times and reattached without damaging the foil.

The adhesive tape described in the first paragraph of this specification is described in US Pat. No. 4,067,337. In the embodiment described in this document, the reduction in effective adhesive area is made by a grilled or body-shaped additional layer located stenciled on the continuous adhesive layer, and their effective area is reduced to the opening in the stencil. As described in US Pat. No. 3,666,609, in particular, plastic nets can be used.

The present invention relates to a process for the manufacture of a releasable closing or securing adhesive tape comprising a strip-shaped carrier coated with a self adhesive on at least an active area in contact with an opposing surface during use of the adhesive tape.

The invention also relates to a removable closing or securing adhesive tape comprising a strip-shaped carrier coated with a self adhesive on at least the active area which is in contact with the opposing surface during use.

1 is a perspective view of an adhesive tape.

FIG. 2 is a cross-sectional view of the adhesive tape of FIG. 1 on an enlarged scale relative to FIG. 1 at the time of lifting the tape from the foil forming the opposing face.

3 is an advanced lifting process shown in FIG. 2.

4 is six different separation patterns.

5 is a top view of another embodiment of an adhesive tape.

FIG. 6 is a schematic diagram illustrating the manufacture of the adhesive tape of FIG. 5.

7 is a symbolic illustration of the peel force induced by the adhesive tape into the opposing surface.

FIG. 8 shows the shear force generated between the adhesive tape and the opposing face according to FIG. 7.

9 shows the peel angle as well as the peel angle.

The production of the above mentioned adhesive tapes is relatively complicated and expensive. It is therefore an object of the present invention that can be produced at low cost and also exhibits sufficiently high adhesion even when the adhesive tape is only lightly pressed against the non-uniform opposing face, but it can be peeled off several times without damaging the sensitive opposing face, in particular thin plastic foil. To develop an adhesive tape that can be.

The object of the invention with respect to the method is solved by the features of claims 1 or 2, and as far as the design of the adhesive tape is concerned the object of the invention is by the features of claims 3 or 4. Resolved.

The adhesive tapes produced by the process of the present invention show very good adhesion, but can be easily lifted from opposite surfaces. The separation pattern printed during lifting hinders the formation of a high force applied to the opposing face, so that during repeated lifting of the adhesive tape no damage of the opposing face, for example the opposing face consisting of thin plastic foil, is observed. The surface pattern, eg the check pattern, of the adhesive tape consisting of the adhesive side or area and the printed non-adhesive area will be slightly stretched when lifting the adhesive tape; During the lifting process, the surface of the opposing part, for example a thin plastic foil, is stretched between two non-adhesive points of the pattern only in the peeling direction so that the force applied on the opposing surface is uniformly distributed in all directions, thus for example The thin foil forming the opposing surface is only stressed within its elastic range, ie it is not damaged.

The separation pattern may consist of discrete points or regions and / or extending regions. In this regard, the geometry of this separation pattern has the advantage that the adhesive layer is interrupted by the parts of the separation pattern in the region of the desired release line. Preferred peel lines can extend exactly transverse to the adhesive tape, but are preferably arranged at a peel angle of 30 °, for example.

Separation patterns can be made using roller printing or by silk screen, and are preferably made from paints, inks, powders or silicon oils.

The carrier can be made of foil, paper, woven or nonwoven, in which case the foil preferably consists of polyethylene, polypropylene, polyvinylchloride or polyester. Fleece or nonwovens made of polypropylene or polyester may also be used.

The adhesive tape may comprise a second cross section adjacent the active area, where the second cross section also includes a continuous adhesive layer that is entirely active. This second longitudinal portion serves as a means of permanently securing the adhesive tape to the base surface. The continuous adhesive layer may be the same as the adhesive layer of the first longitudinal portion, but may be different if there are special restrictions.

Moreover, the carrier may comprise a lifting strip arranged at a portion adjacent to its active area. The portion forming the lifting strip may consist of a non-adhesive area or a portion coated with an adhesive, which is then covered with a protective foil or a separation foil.

According to another aspect, the active area of the adhesive may comprise a continuous adhesive layer, which in turn comprises a print cover which completely covers the first layer to control the reduced adhesive holding force, the cover comprising paint, ink, It is made of materials such as powder and silicon oil. By appropriately selecting different parameters such as the agent or material forming the reducing layer, the thickness of the reducing layer and its moisture content, the aggressive adhesive retention of the adhesive layer can be reduced to an advantageous value.

It may be useful to have a carrier coated with an adhesive layer on the underside to improve all possible uses of the adhesive tapes of the present invention. The adhesive layer on the bottom face may be a conventional adhesive or the entire active layer of glue, or may be a special adhesive layer comprising the features of claims 3 or 4.

The adhesive tape shown in FIG. 1 consists of a strip-shaped carrier 1 with a continuous adhesive layer 2 coated on its top surface. In the first longitudinal portion 3, a separation pattern 4 is printed on the adhesive layer 2 to reduce the active adhesive area, whereby the separation pattern is a discontinuous non-adhesive area arranged symmetrically and uniformly. It includes.

In the second longitudinal portion 5 adjacent the separation pattern 4, the adhesive layer 2 is not covered, so that an active adhesive region is formed by the surface of the second longitudinal portion 5, and the first The two longitudinal portions are used to permanently fix the adhesive tape to the base surface.

FIG. 1 also shows that the carrier 1 comprises an adhesive free portion forming a finger lifting strip 6 arranged opposite the second longitudinal section 5.

2 and 3 show in detail the longitudinal part 3 covered with the separating pattern 4 which is adhesively fixed to the opposing face 7 in the form of a plastic foil. When lifting the active area of the adhesive tape formed by the first longitudinal portion 3 from the plastic foil 7, the uncoated adhesive area 2a between the printed separation areas is respectively plastic for only a short time. Damage to the plastic foil 7 is prevented by causing elongation of the relevant area of the foil 7. Upon separation of the adhesive region 2a from the plastic foil 7, the region of the plastic foil 7 stressed by the adhesive region of the adhesive tape can be released from stress.

4 shows six different aspects of the separation pattern 4. Two of these examples show a separating pattern 4 comprising an extension region 8, while the other four examples include a cross-shaped or star-shaped discontinuous region 9.

FIG. 5 shows an embodiment of an adhesive tape modified from that of FIG. 1. The first longitudinal portion 3 forming the active area of the adhesive tape comprises a printed non-bonded or less glued separation pattern 10 and an adhesive pattern 11 of self adhesive printed into the void of the separation pattern. do. The separating pattern 10 is grilled or body shaped, while the adhesive pattern 11 consists of discontinuous glue segments. 6 shows a symbolic manufacturing method of the active region 3. The carrier 1 first moves in the direction of the arrow through the printing station 12 for the separation pattern, prints the separation pattern 10 on the active area 3 and then the printing station 13 for the adhesive pattern. The adhesive is printed in the empty space (sieve space) of the separation pattern 10. In principle, this printing process can also be performed in the reverse order.

FIG. 7 shows the peel force induced by the adhesive tape 14 into the opposing face 7, where the peel force between the two dashed lines is approximately a third lifting force F, the outside of this central area being approximately Sixth upward force (F).

8 shows the shear force between the adhesive tape 14 and the opposing face 7.

9 shows the raised adhesive tape 14 of the opposing face 7 along the advancing peeling line 15, the tape being peeled off angle α along the line extending in the transverse direction of the lifting tab 14. ). According to the invention, the separation pattern 4 or 10 has a separation line 15 constantly traversing the cross section of the separation pattern 4 or 10, respectively, and thus adhesive or in the area of the separation line 15. It must be arranged or designed in such a way that no continuous extension area of the glue exists.

Claims (15)

A strip-shaped carrier coated with a self adhesive on at least the active area in contact with the opposing surface during use of the adhesive tape, Coating the active area with a self adhesive forming a continuous layer in a first step, and printing a non-bonded or less glued separation pattern on the self adhesive layer in order to reduce the total effective adhesive area in a second step. By A method of making a detachable closure or fastening adhesive tape. A strip-shaped carrier coated with a self adhesive on at least the active area in contact with the opposing surface during use of the adhesive tape, Printing a non-bonded or less bonded separation pattern on the active area, and printing an adhesive pattern in the empty space of the non-bonded or less bonded separation pattern. A method of making a detachable closure or fastening adhesive tape. A strip-shaped carrier coated with a self adhesive on at least the active area in contact with the opposing surface during use of the adhesive tape, A first step comprising a self-adhesive (non-bonded or less-adhesive material (reducing material) forming a continuous layer of the active area, the material being activated in a second step by optical, physical and / or chemical means Coated with) A method of making a detachable closure or fastening adhesive tape. The method of claim 3, wherein Using a laser or concentrated electron beam means for activation of the reducing material. A strip-shaped carrier (1) coated with a self adhesive on at least the active area (3) in contact with the opposing surface (7) during use, The active area 3 comprises a continuous adhesive layer 2 of self-adhesive, the adhesive which in turn is a non-bonded or less-adhesive separation pattern 4 of the material (the one made of adhesive) Printed on layer 2), Removable closure or fastening adhesive tape. A strip-shaped carrier (1) coated with a self adhesive on at least the active area (3) in contact with the opposing surface (7) during use, Characterized in that the active area (3) consists of a printed non-bonded or less adhered separation pattern (10) and a self-adhesive adhesive pattern (11) printed into the empty space of the separation pattern (10). Removable closure or fastening adhesive tape. The method according to claim 5 or 6, Adhesive tape, characterized in that the separation pattern (4, 10) comprises a discontinuous region (9) and / or an extended region (8) such as a wavy, grilled or the like. The method according to any one of claims 5 to 7, The separation pattern 4, 10 as described above, wherein the adhesive layer 2 or the adhesive pattern 11 is interrupted by portions of the separation pattern (4, 10, respectively) in the region of the desired release line 15. Adhesive tape characterized by the arrangement of. The method according to any one of claims 5 to 8, Adhesive tape, characterized in that the printed separation patterns (4, 10) are formed from a material selected from paint, ink, powder, silicon oil and the like. The method according to any one of claims 5 to 9, Adhesive tape, characterized in that the carrier is formed from a material selected from foil, paper, woven or nonwoven (fleece). The method according to any one of claims 5 to 10, Adhesive tape, characterized in that the second portion (5) of the carrier (1) is longitudinally adjacent to the active area (3), comprising a continuous adhesive layer (2) which is active in its entirety. The method according to any one of claims 5 to 11, Adhesive tape, characterized in that the carrier (1) comprises a finger lift strip (6) arranged in a portion adjacent the active area (3). A strip-shaped carrier (1) coated with a self adhesive on at least the active area (3) in contact with the opposing surface (7) during use, The active area 3 comprises a continuous adhesive layer 2 of self-adhesive, in which the adhesive completely covers the first layer in order to control the reduced adhesive holding force (paint, ink, powder, silicon). It is formed of a material selected from oil, etc.) characterized in that Removable closure or fastening adhesive tape. A strip-shaped carrier (1) coated with a self adhesive on at least the active area (3) in contact with the opposing surface (7) during use, The active area 3 comprises a continuous adhesive layer 2 of self adhesive, which in turn comprises an unbonded or less adhesive material (reducing material) which is activated by optical, physical and / or chemical means. Characterized by Removable closure or fastening adhesive tape. The method according to any one of claims 5 to 14, Adhesive tape, characterized in that the lower surface of the carrier (1) is also covered with an adhesive layer.