JPH11198267A - Adhesive cushion sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive cushion sheet being stuck on corner sections of a body to be protected for a long period of time even when the body is thick, which can be released simply from the body to be protected. SOLUTION: An adhesive cushion sheet is constituted of a foamed resin sheet 1 on which at least one channel section 2 is recessed in the length direction on a sheet surface and adhesive sheets 5 attached on both sides of the width direction of the foamed resin sheet 1, and the adhesive sheets 5 are constituted of a metal foil 3 and an adhesive mass layer 4 formed on the surface of the metal foil 3. As the metal foil 3, a flexible aluminum foil or the like can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to protecting corners of articles and structures from external forces such as collision loads.
The present invention relates to a cushion sheet used by being adhered to the corner.

[0002]

2. Description of the Related Art In order to protect an article or a structure from an external force such as a collision load, a cushion sheet such as a foamed resin sheet is stuck to the surface thereof with an adhesive. In particular, the cushion sheet is often attached to a corner where stress concentration occurs due to a collision load.
When the collision load is large, a cushion sheet having a large thickness, for example, a thick cushion sheet having a thickness of about 5 to 20 mm is used in order to secure protection against articles and the like. However, when a thick cushion sheet is adhered to a corner of an article or the like with an adhesive, a peeling force (a tensile force in a direction perpendicular to the attaching interface) is applied to the joining interface based on the elastic bending reaction force of the cushion sheet. Since it acts, it is difficult to adhere to the protected surface, and even if it adheres, it is easy to peel off at the interface. On the other hand, when the cushion sheet is peeled off from the article or the like without the need for protection, if the protected surface of the article or the like and the foamed resin sheet constituting the cushion sheet are directly adhered by an adhesive, the foamed resin sheet becomes a layer. It often breaks, and it is difficult to remove the foamed resin sheet cleanly without leaving it on the protected surface.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a long-term peeling method for protecting a protected object such as an article or a structure, even if it is thick, when it is adhered to a corner portion of the protected object. The present invention provides an adhesive cushion sheet that can stably adhere without sticking, and can be easily peeled from a protected body without leaving a foamed resin sheet on the protected surface when protection is no longer required. Is to do. Another object of the present invention is to provide a pressure-sensitive adhesive cushion sheet having excellent adhesion and workability to a protected surface even if it is thick.

[0004]

Means for Solving the Problems As a result of extensive studies to achieve the above object, the present inventor has found that if the adhesive cushion sheet is composed of a foamed resin sheet having a specific structure and a pressure-sensitive adhesive sheet of a specific material, the protected sheet is protected. They have found that they can be stuck to the corners of the body for a long period of time, and they can be easily peeled off when they are no longer needed. That is, the adhesive cushion sheet of the present invention comprises (A) a foamed resin sheet in which at least one groove is formed in the sheet surface in the length direction, and (B) both sides in the width direction of the foamed resin sheet (A). And a pressure-sensitive adhesive sheet attached to the pressure-sensitive adhesive sheet, wherein the pressure-sensitive adhesive sheet (B) is composed of a metal foil and a pressure-sensitive adhesive layer formed on the surface of the metal foil.

[0005]

In the pressure-sensitive adhesive cushion sheet of the present invention, since at least one groove is formed in the longitudinal direction of the surface of the foamed resin sheet, the adhesive cushion sheet is bent and adhered to the corner of the protected body by the groove. By doing so, the elastic bending reaction force of the cushion sheet can be significantly reduced. Therefore, it can be easily and reliably stuck to the corner. Also, an adhesive sheet attached to both sides in the width direction of the foamed resin sheet,
Since it is composed of a metal foil having a pressure-sensitive adhesive layer formed on the surface, it can be firmly adhered to a protected object. For this reason, in combination with the action of the groove, the stuck state can be stably maintained without peeling for a long time. Furthermore, when the foamed resin sheet and the protected object are not directly adhered to each other with an adhesive, but are adhered to the protected object by the adhesive sheets attached to both sides of the foamed resin sheet, so that protection is no longer required. In this case, the foamed resin sheet can be peeled and removed from the protected object without causing layer breakage.
Therefore, there is no possibility that the foamed resin or the adhesive remains on the surface of the protected object.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings as necessary. In the drawings, all objects are schematically shown, and the same elements are denoted by the same reference numerals.

FIG. 1 is a schematic cross-sectional view showing an example of the adhesive cushion sheet of the present invention. In this example, the adhesive cushion sheet includes a foamed resin sheet 1 and adhesive sheets 5 and 5 attached to both sides of the foamed resin sheet 1 in the width direction.
And release papers (release papers) 6 and 6 covering the adhesive surfaces of the adhesive sheets 5 and 5 (the surface on the side of the adhesive layer 4 described below). At a substantially central portion in the width direction of one surface of the foamed resin sheet 1, one groove portion 2 having a V-shaped cross section is formed in the length direction. The adhesive sheet 5 includes a metal foil 3 as a support.
And an adhesive layer 4 formed on one surface of the metal foil 3.
It is composed of In this example, one end of the adhesive surface of the adhesive sheet 5 in the width direction is connected to the surface of the foamed resin sheet 1 (more specifically, the width direction of the surface opposite to the groove recessed surface). By sticking directly to the end portion), the integrity of the adhesive sheet 5 and the foamed resin sheet 1 is maintained.

[0008] The material of the foamed resin sheet 1 is not particularly limited as long as it is a resin foam having excellent shock buffering properties. Examples thereof include polyolefin resin, polyurethane, rubber, styrene resin, vinyl chloride resin, phenol resin, and the like. Examples include resin foams such as urea resin, epoxy resin, and methacrylic resin. Among them, a polyolefin-based resin foam, a polyurethane foam, a foamed rubber, and the like are preferable, and a polyolefin-based resin foam is particularly preferable. The resin of the resin foam may be cross-linked.

The polyolefin-based resin includes a polyolefin-based homopolymer, a polyolefin-based copolymer, or a mixed resin containing these as a main component, which is a foamable resin. As polyolefin resin, high, medium,
Ethylene resins such as low-density polyethylene, low- and ultra-low-density linear polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer; polypropylene,
A propylene-based resin such as a propylene-ethylene copolymer is exemplified.

The foamed resin sheet 1 can be formed by a conventional foam molding method. The cell structure may be either a closed cell or an open cell, but a closed cell is preferred from the viewpoint of strength.
The expansion ratio can be selected from a range of about 1.2 to 100 times depending on the type of the resin. For example, the expansion ratio of a polyolefin resin foam is generally about 5 to 40 times, preferably about 15 to 30 times. The width of the foamed resin sheet 1 can be appropriately selected depending on the size of the protected object, and the like.
Usually 50 to 1000 mm, preferably 100 to 200 m
m. The thickness of the foamed resin sheet 1 can be appropriately set according to the material of the foamed resin sheet, the material of the protected object, the magnitude of an expected collision load, and the like. The thickness is, for example, 2 to
50 mm, preferably about 4 to 30 mm;
It is often about 0 mm.

The angle of the V-shape of the V-shaped groove 2 can be appropriately set according to the angle of the corner of the body to be protected.
0 to 150 degrees, preferably about 50 to 130 degrees,
In many cases, it is approximately 90 degrees (for example, about 80 to 110 degrees). The depth of the groove 2 can be selected within a range that does not impair the protection of the protected object. For example, the depth is 30 to 95%, preferably 50 to 90%, with respect to the thickness of the foamed resin sheet 1.
More preferably, it is about 60 to 85%. The cross-sectional shape of the groove 2 is not limited to the V-shape, and may be a U-shape. However, when the groove 2 is bent to protect the corners of the protected body, no gap is formed in the bent portion and tightness is maintained. Is preferably V-shaped.

It is sufficient that at least one groove 2 is formed. For example, a plurality of grooves 2 (for example,
2-3) It may be formed. The formation position of the groove 2 is
Depending on the number of the groove portions, it can be appropriately set in consideration of the protection property for the protected object. When the number of the groove portions is one as in the example of FIG. 1, the groove portion 2 is often formed at an inner portion in the width direction of the foamed resin sheet 1, for example, at a substantially central portion.

The material of the metal foil 3 constituting the pressure-sensitive adhesive sheet 5 may be any metal having a high extensibility, such as aluminum, tin, lead, and copper. Of these, soft aluminum is preferred. When soft aluminum is used as a support for the adhesive sheet 5, it can be stably stuck to hard-to-adhere rough surfaces such as bare concrete or embossed walls. The thickness of the metal foil 3 is, for example, 5 to 500 μm, preferably 10 to 10 μm.
0 μm, more preferably about 25 to 50 μm.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 4 formed on the surface of the metal foil 3 may be a conventional pressure-sensitive adhesive, for example, an acrylic, rubber, urethane, silicone, or vinyl pressure-sensitive adhesive. From among them, it can be appropriately selected and used according to the material of the protected surface, the use environment, and the like. The thickness of the pressure-sensitive adhesive layer 4 can be appropriately determined, and is generally 10 to 100 μm, preferably 30 to 100 μm.
It is about 50 μm. Note that an undercoat layer or the like may be formed between the metal foil 3 and the adhesive layer 4.

Effective width of the pressure-sensitive adhesive sheet 5 (value obtained by subtracting the width of the adhesive portion with the foamed resin sheet 1 from the width of the pressure-sensitive adhesive sheet 5)
Can be appropriately selected in consideration of the adhesiveness and workability to the protected object, and is generally 10 to 200 mm, preferably 25 to 200 mm.
It is about 60 mm. As the release paper 6, a conventional release paper can be used for an adhesive tape or an adhesive sheet.

The pressure-sensitive adhesive sheet 5 does not necessarily have to be adhered to the surface of the foamed resin sheet 1 opposite to the groove-formed surface, but to the groove-formed surface of the foamed resin sheet 1. However, the former is preferable because the thickness of the foamed resin at the corners can be ensured when the corners of the protected body are protected by bending at the grooves. In the above example, the pressure-sensitive adhesive sheets 5 and 5 are attached to both ends of the foamed resin sheet 1 apart from each other. However, the pressure-sensitive adhesive sheet is constituted by one sheet wider than the foamed resin sheet 1. Alternatively, the entire surface of the foamed resin sheet 1 may be covered. Further, on the surface opposite to the metal foil surface of the adhesive sheet 5 or the groove forming surface of the foamed resin sheet 1, for example, in order to enhance visibility, a film (such as a film on which characters or patterns are printed or a reflection sheet) ( Or sheets).

FIG. 2 is a schematic cross-sectional view showing another example of the adhesive cushion sheet of the present invention. The adhesive cushion sheet includes a foamed resin sheet 1 and a foamed resin sheet 1.
Pressure-sensitive adhesive sheets 5 and 5 provided on both sides in the width direction, release papers 6 and 6 covering the pressure-sensitive adhesive surfaces of the pressure-sensitive adhesive sheets 5 and 5, and a surface of the foamed resin sheet 1 opposite to the groove recessed surface. And a sheet-like support 10 covering the entire metal foil surface of the pressure-sensitive adhesive sheet 5.

As in the example of FIG. 1, the groove 2 is recessed at substantially the center in the width direction of one surface of the foamed resin sheet 1.
The pressure-sensitive adhesive sheet 5 also includes the metal foil 3 and the pressure-sensitive adhesive layer 4 as in the example of FIG. The sheet-like support 10 is
It is composed of a base film 7, a printed layer 8 formed on one surface of the base film 7, and an adhesive layer 9 formed on the other surface. 5
Is adhered to the sheet-like support 10 by the pressure-sensitive adhesive layer 9. That is, in this example, the integrity of the pressure-sensitive adhesive sheets 5 and 5 and the foamed resin sheet 1 is maintained through the sheet-like support 10 as the third sheet.

The substrate film 7 is not particularly limited, and is a conventional film, for example, a plastic film such as an olefin resin (eg, polyethylene or polypropylene), polyester, a vinyl resin (eg, polyvinyl chloride), or a styrene resin. And the like. The thickness of the base film 7 is not particularly limited, and can be appropriately set in consideration of strength, workability, and the like, but is generally about 10 to 500 μm, and preferably about 50 to 200 μm.

The printing layer 8 can be formed by a conventional printing method. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 9, the same pressure-sensitive adhesive as the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 4 of the pressure-sensitive adhesive tape 5 can be used. The thickness of the pressure-sensitive adhesive layer 9 is the same as that of the pressure-sensitive adhesive layer 4. Note that an undercoat layer or the like may be provided between the base film 7 and the adhesive layer 8. According to the adhesive cushion sheet of this example, since it has the sheet-like support 10,
The mechanical strength is improved, and the visibility can be increased by forming characters and patterns on the print layer 8.

FIG. 3 is a schematic cross-sectional view showing still another example of the adhesive cushion sheet of the present invention. In this example, two grooves 2 and 2 are formed in parallel in the foamed resin sheet 1, one of which is recessed substantially in the center in the width direction of the foamed resin sheet 1, and the other groove is formed by the groove And the end of the foamed resin sheet 1 is substantially recessed at the center.

In such an adhesive cushion sheet,
Since the two corners of the protected body can be protected at the same time,
Work efficiency can be improved. The positions of the two groove portions are not necessarily limited to the above, and can be appropriately selected depending on the shape and thickness of the protected object. For example, the interval between the two grooves on the surface of the foamed resin sheet (the distance between the upper ends of the grooves) can be set according to the distance between the two corners of the protected body (for example, the thickness of H steel or the like). The length of the adhesive cushion sheet can be appropriately selected in consideration of the type of the body to be protected, the handleability, and the like. In the case of a long length, the adhesive cushion sheet may be wound into a roll and cut as appropriate according to the length of the protected object before use.

The pressure-sensitive adhesive cushion sheet of the present invention can be formed by bonding the pressure-sensitive adhesive sheet 5 to the pressure-sensitive adhesive sheet 5 by means such as sticking the pressure-sensitive resin sheet 1 and the pressure-sensitive adhesive sheet 5 directly or through another sheet. It can be manufactured by attaching to both sides in the width direction. For example, the adhesive cushion sheet shown in FIG. 1 is configured such that an end in the width direction of the adhesive surface of the adhesive sheet 5 and an end in the width direction of the surface of the foamed resin sheet 1 on the side opposite to the groove recessed surface. It can be manufactured by sticking. Also,
The adhesive cushion sheet shown in FIGS. 2 and 3 has a surface opposite to the groove recessed surface of the foamed resin sheet 1 adhered to the widthwise central portion of the adhesive surface of the sheet-like support 10, and It can be manufactured by attaching the metal foil surfaces of the adhesive sheets 5 and 5 to the remaining portion of the adhesive surface of the sheet-like support 10.

The adhesive cushion sheet of the present invention is excellent in adhesiveness (particularly, rough surface adhesiveness), handleability, and workability. Therefore, it can be used for a wide range of articles and structures made of metal, plastic, rubber, wood, glass, concrete, and the like. Applicable to things.

[0025]

EXAMPLES The present invention will be described below in more detail with reference to Examples, but the present invention is not limited to these Examples. Example 1 The adhesive cushion sheet shown in FIG. 1 was manufactured as follows. An electron beam crosslinked polyethylene foam having an expansion ratio of 15 times (thickness: 6 mm, width: 14) was used as the foamed resin sheet 1.
0 mm), and a cross section V having an angle of 90 degrees and a depth of 4.5 mm in the length direction substantially at the center of the sheet in the width direction.
A U-shaped groove 2 was provided. On the other hand, width 30mm, thickness 0.03
An acrylic pressure-sensitive adhesive was applied to the surface of a soft aluminum foil 3 (support) having a thickness of 0.03 mm so as to have a dry thickness of 0.03 mm to form a pressure-sensitive adhesive sheet 5 (pressure-sensitive adhesive tape). At both ends in the width direction of the surface of the foamed resin sheet 1 where the grooves are not formed, the ends in the width direction of the pressure-sensitive adhesive sheet 5 are bonded so as to have a bonding width of 5 mm. Of the foamed resin sheet 1 (width 25
mm), the release paper 6 is stuck to the adhesive surface of
m of the adhesive cushion sheet was obtained.

Example 2 An adhesive cushion sheet shown in FIG. 2 was produced as follows. One side of a white unstretched polypropylene film (thickness 0.1 mm, width 200 mm) (base film 7) is subjected to green oblique stripe printing to form a printed layer 8, and the other side is dried with an acrylic pressure-sensitive adhesive. 0.03 thickness
mm to obtain a sheet-like support 10. The same surface of the foamed resin sheet 1 as in Example 1 where the grooves were not formed was attached to the center of the adhesive surface of the sheet-like support 10 in the width direction. Next, the aluminum foil surface of the pressure-sensitive adhesive sheet 5 similar to that of Example 1 in which the release paper 6 was bonded to the pressure-sensitive adhesive surface in advance was bonded to the remaining portions (width 30 mm) of both ends of the pressure-sensitive adhesive surface of the sheet-like support 10, 200m wide
m of the adhesive cushion sheet was obtained.

Comparative Example 1 The same foamed resin sheet 1 as in Example 1 (however, width 200
mm) without applying a groove, directly apply an acrylic pressure-sensitive adhesive to one side to a dry thickness of 0.03 mm,
Further, the release paper 6 is stuck on this adhesive surface, and the full width 20
A 0 mm sticky cushion sheet was obtained. FIG. 4 shows a schematic cross-sectional view of the adhesive cushion sheet.

Comparative Example 2 In the same manner as in Example 1, a groove 2 was provided in the foamed resin sheet 1 (with a width of 200 mm), and an acrylic pressure-sensitive adhesive was directly applied to the surface where the groove was formed to a dry thickness of 0.03 mm. And release paper 6 is stuck on this adhesive surface to form
A 0 mm sticky cushion sheet was obtained. FIG. 5 shows a schematic cross-sectional view of this adhesive cushion sheet.

EXPERIMENTAL EXAMPLES The adhesive cushion sheets of Examples 1 and 2 and Comparative Examples 1 and 2 were sufficiently adhered to the bare concrete corners using a rubber roller after the release paper 6 was peeled off. Affixed as follows. This was allowed to stand in a constant temperature and humidity room at 23 ° C. × 65% for 4 weeks, and the presence or absence of peeling of the cushion sheet was observed. After 4 weeks, the foam resin sheet portion of the cushion sheet was grasped and peeled off from the concrete, and the ease of peeling of the sheet and the state of the concrete surface after peeling the sheet were observed. As a result, with the adhesive cushion sheets of Examples 1 and 2, the sheets could be stably stuck without peeling for 4 weeks.
Moreover, when the cushion sheet was peeled off, the foamed resin and the adhesive did not remain on the concrete surface, and the cushion sheet could be peeled cleanly and easily. On the other hand, in the adhesive cushion sheet of Comparative Example 1, both ends began to float immediately after the cushion sheet was attached to the corner of the concrete.
After a day, it completely peeled off and fell. Comparative Example 2
When the cushion sheet was peeled off from the concrete, the foamed resin sheet portion cracked, and a part of the foamed resin sheet remained on the concrete surface.

[0030]

According to the pressure-sensitive adhesive cushion sheet of the present invention, even when it is thick, it does not peel for a long time when it is adhered to the corner of the protected object to protect the protected object. Not only can the stuck state be stably maintained, but when protection is no longer required, it can be easily and cleanly peeled off the protected object without leaving the foamed resin on the protected surface.
Moreover, even if it is thick, it is excellent in adhesiveness to a protected surface and workability.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one example of the adhesive cushion sheet of the present invention.

FIG. 2 is a schematic cross-sectional view showing another example of the adhesive cushion sheet of the present invention.

FIG. 3 is a schematic cross-sectional view showing still another example of the adhesive cushion sheet of the present invention.

FIG. 4 is a schematic cross-sectional view showing an adhesive cushion sheet of Comparative Example 1.

FIG. 5 is a schematic cross-sectional view showing an adhesive cushion sheet of Comparative Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foam resin sheet 2 Groove part 3 Metal foil 4 Adhesive layer 5 Adhesive sheet 6 Release paper 10 Sheet support

Claims (4)

[Claims] 1. A foamed resin sheet in which at least one groove is formed in the sheet surface in a longitudinal direction, and (B) an adhesive sheet provided on both sides of the foamed resin sheet (A) in a width direction. Wherein the adhesive sheet (B) comprises a metal foil and an adhesive layer formed on the surface of the metal foil. 2. The adhesive cushion sheet according to claim 1, wherein the metal foil is a soft aluminum foil. 3. The pressure-sensitive adhesive according to claim 1, wherein an end in the width direction of the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet (B) is affixed to a surface of the foamed resin sheet (A) on a side opposite to the groove recessed surface. Cushion seat. 4. The method according to claim 1, further comprising: (C) a sheet-like support wider than the foamed resin sheet (A);
The surface of the foamed resin sheet (A) opposite to the groove recessed surface is adhered to one surface of the support (C) except for both ends in the width direction of the support (C), and The adhesive cushion sheet according to claim 1, wherein the metal foil surface of the adhesive sheet (B) is adhered to a non-adhered portion of the foamed resin sheet (A) in the support (C).