JP2012072347A - Surface protecting sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a surface protecting sheet which is easy in handling.SOLUTION: In a surface protecting sheet which is stuck onto an adherend to be protected and protects the adherend against external impact, the surface protecting sheet is specified by the followings. The surface protecting sheet is obtained by sandwiching both faces of a prescribed width of an impact-absorbing sheet having an impact-absorbing property, with hand-tearable films having a hand-tearing property. Either of the hand-tearable films has a self-adhesive face to be stuck onto the adherend, more particularly, both the faces of the impact-absorbing sheet 2 are sandwiched with the hand-tearable films 3, 4, where the self-adhesive face 41 to be stuck onto the adherend is formed on either hand-tearable film 4.

Description

  The present invention relates to a surface protective sheet for protecting furniture and wall surfaces from being damaged, for example, when moving, and more particularly to a surface protective sheet that is easier to handle.

  For example, Patent Document 1 proposes an opening frame protection sheet (so-called curing sheet) for preventing damage to furniture, a sash of a house, or the like during carry-in / out such as moving. The surface protective sheet is made of a foamed polyethylene sheet base material, and can be attached to an adherend by providing an adhesive layer along both ends of the back surface.

  Variations with different tape widths are available for the surface protection sheet. The narrow type is used for window frame sashes and the like, and the wide type can cover and cover furniture and pillars as a whole.

  However, the conventional surface protection sheet is composed only of a foam sheet and has a low strength, and may be torn by a slight impact or catch. Furthermore, since the foam sheet does not have a hand cutting property, it is easy to tear diagonally when it is cut by hand, and it has been necessary to cut it using a cutting tool such as a cutter or scissors.

  Furthermore, the conventional surface protection sheet has a release paper attached to protect the adhesive surface, and is attached to the adherend while removing the release paper, which makes the attaching operation troublesome. . In addition, since the release paper is provided, the cost is increased, and the used release paper must be disposed of.

JP 2001-207648 A

  Then, this invention was made | formed in order to solve the subject mentioned above, The objective is to provide the surface protection sheet which is easier to handle at low cost.

  In order to achieve the above-described object, the present invention has several features described below. The invention according to claim 1 is a surface protective sheet that is affixed to the surface of an adherend to be protected and protects the adherend from an external impact. While sandwiching both sides of the absorbent sheet with a hand-cut film having a hand-cut property in the width direction, either one of the hand-cut films is provided with an adhesive surface for sticking to the adherend. It is characterized by being.

  A second aspect of the present invention is characterized in that, in the first aspect, the impact absorbing sheet is formed by superposing a foam sheet and a cushioning sheet having an air layer therein.

  A third aspect of the present invention is the method according to the first or second aspect, wherein the surface of either one of the hand-cut films is subjected to a treatment for weakening the adhesive force to the adhesive surface. It rolls in the shape of a roll so that the said adhesive surface of said one said hand-cut film may contact the surface of a film.

  According to a fourth aspect of the present invention, in the first, second, or third aspect, the pressure-sensitive adhesive surface is made of a detachable pressure-sensitive adhesive.

  A fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein the one hand-cut film is a uniaxially stretched film having a hand-cut property in one direction, and the other hand-cut film. The adhesive film is characterized by comprising a double-sided pressure-sensitive adhesive tape having hand cutting properties in two directions.

  The invention according to claim 6 is a surface protective sheet that is affixed to the surface of an adherend to be protected and protects the adherend from an external impact. It has an absorbent sheet and a hand-cut film having a hand-cut property, and a weak part where the strength of the shock-absorbing sheet is weakened is formed in a streak shape along a predetermined direction in a part of the shock-absorbing sheet The hand-cut film is adhered to at least one surface of the shock absorbing sheet.

  The invention according to claim 7 is characterized in that, in the above-mentioned claim 6, the shock absorbing sheet is made of a foam sheet, and the foam sheet is subjected to a grid-like unevenness process as the weakening means. It is said.

  The invention described in claim 8 is characterized in that, in the above-mentioned claim 6 or 7, the hand-cut film is composed of a double-sided pressure-sensitive adhesive tape having hand-cut characteristics in two directions of the vertical direction and the horizontal direction.

  The invention according to claim 9 is the corona discharge treatment for enhancing the adhesion with the double-sided pressure-sensitive adhesive tape on the surface of the shock-absorbing sheet to which the double-sided pressure-sensitive adhesive tape is attached, according to claim 9 or claim 8. It is characterized by being given.

  According to the present invention, since both sides of the impact absorbing sheet are sandwiched by the hand-cut film, it can be easily separated by hand at an arbitrary position. Further, by combining the shock absorbing sheet with the foam sheet and the cushioning material sheet, the shock absorbing sheet is more excellent in shock absorbing property and the strength of the sheet itself is improved. Furthermore, because the surface of the other hand-cut film is treated to weaken the adhesive force, it can be rolled up and stored in a roll without the need for conventional release paper, making it cheaper. Easy pasting work.

  In addition, by sticking a hand-cut film on one surface of the shock absorbing sheet and applying a lattice-shaped uneven treatment to the shock absorbing sheet, it can be easily cut without using a cutter or the like. Furthermore, by performing corona discharge treatment on the surface of the impact absorbing sheet to which the double-sided pressure-sensitive adhesive sheet is attached, fine irregularities are formed, and the adhesion between the impact absorbing sheet and the hand-cut film can be enhanced.

The typical perspective view of the surface protection sheet concerning one embodiment of the present invention. The fragmentary sectional view of the said surface protection sheet. The fragmentary sectional view which shows the 1st modification of the said surface protection sheet. The fragmentary sectional view which shows the 2nd modification of the said surface protection sheet.

  Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the surface protection sheet 1 includes an impact absorbing sheet 2 and hand-cut films 3 and 4 that are bonded along both surfaces of the shock-absorbing sheet 2. The film 4 is wound in a roll shape so that the adhesive surface 41 of the film 4 is in direct contact with the uneven surface 31 of the hand-cut film 3.

  The shock absorbing sheet 2 is formed by superposing a foam sheet 21 in which a foam resin is formed in a sheet shape and a cushioning sheet 22 having an air layer 23 inside. The foam sheet 21 is made of a 1.0 mm thick sheet body obtained by foaming a polyethylene resin at a predetermined magnification.

  In this example, the foam sheet 21 is made of polyethylene, but other materials may be used. The sheet thickness is 1.0 mm, preferably more than 0.5 mm. That is, when the thickness is 0.5 mm or less, the foam sheet 21 is too thin and melts when the foam sheet 21 and the buffer material sheet 22 are integrated by heat fusion, which is not preferable.

  The cushioning material sheet 22 includes a cap film 22a formed in a concavo-convex wave shape, and a back film 22b bonded together so as to close the other surface of the cap film 22a. Both the cap film 22a and the back film 22b are made of polyethylene.

  The cap film 22a and the back film 22b are integrated by heat fusion, and an air layer (bubble) 23 is formed between them. The air layers 23 are each formed in an independent columnar shape, and are regularly arranged at predetermined intervals on the cushioning material sheet 22, and in this example, are arranged in a staggered manner in a plan view.

  In this example, the cushioning material sheet 22 preferably has a sheet thickness of 2.0 to 4.0 mm. That is, if the sheet thickness is less than 2.0 mm, it is not preferable because the shock absorbing ability as a cushioning material is inferior. On the contrary, if the sheet thickness exceeds 4.0 mm, the strength becomes too high and curves according to the shape. This is not preferable because it is difficult to bend or bend.

  In this example, the foam sheet 21 and the cushioning material sheet 22 are integrated with the foam sheet 21 on the back film 22b side of the cushioning material sheet 22 by heat fusion. In addition to this, for example, it may be integrated by adhesion or the like, and the means for bonding the foam sheet 21 and the cushioning material sheet 22 may be arbitrarily selected according to the specifications.

  Next, one hand-cut film 3 (hereinafter referred to as a first hand-cut film) is attached along one surface (the upper surface in FIG. 2) of the shock absorbing sheet 2. The first hand-cut film 3 is made of a resin film made of polyethylene and having a film thickness of 10 to 20 μm, and has hand-cut characteristics along the width direction (the arrow direction in FIG. 1).

  In this example, the first hand-cut film 3 is a uniaxially stretched film that is stretched in the uniaxial direction so as to have a hand-cut property in the width direction of the surface protective sheet 1. It should be noted that other aspects are also included in the present invention as long as they can have hand cutting properties other than the uniaxially stretched film.

  On the surface of the first hand-cut film 3, as shown in FIG. 1, when the surface protective sheet 3 is wound into a roll, the other hand-cut film 4 (hereinafter referred to as the second hand-cut film 4 and The concave / convex surface 31 is provided with a concave / convex treatment as a processing for weakening the adhesive force to the adhesive surface 41.

  In this example, as a method for weakly adhering, the film surface is subjected to a concavo-convex process, but there are other processes such as a knurling process or an embossing process for reducing the contact area with the adhesive surface 41. Alternatively, a release agent layer may be provided on the surface and subjected to easy peeling treatment or the like.

  The first hand-cut film 3 is integrally bonded to the lower foam sheet 21 by heat-sealing, but may be bonded by an adhesive other than this, and the method depends on the specification. It may be arbitrarily selected.

  Next, the second hand-cut film 4 is a so-called cross tape formed by weaving a polyethylene flat yarn into a sheet shape, and has hand-cut characteristics in both the vertical direction and the horizontal direction. In this example, the second hand-cut film 3 has a film thickness of 20 μm, but the film thickness may be arbitrarily set according to specifications.

  A first adhesive surface 41 for attaching the surface protection sheet 1 to an adherend is provided on one surface (lower surface in FIG. 2) of the second hand-cut film 4. The first pressure-sensitive adhesive surface 41 is uniformly coated with a re-peelable pressure-sensitive adhesive having removability, in this example, an acrylic pressure-sensitive adhesive.

  The re-peelable pressure-sensitive adhesive is preferably adjusted so that its adhesive strength is 3 to 5 N / 25 mm so that it can be repeatedly applied and peeled off. That is, when the adhesive strength is less than 3 N / 25 mm, the adhesive strength is too weak and may be peeled off by its own weight. On the contrary, when the adhesive strength is more than 5 N / 25 mm, the adhesive strength is too large, and when pasted on a white wood or the like, the surface of the white wood may be destroyed.

  On one surface (the lower surface in FIG. 2) of the second hand-cut film 4, a second adhesive surface 42 for attaching the second hand-cut film 4 to the shock absorbing sheet 2 is provided. The second adhesive surface 42 is made of the same acrylic adhesive as the first adhesive surface 41, and is uniformly applied so that the adhesive force is 6 N / 25 mm. The second adhesive surface 42 can be arbitrarily changed according to the specifications.

  Next, the 1st modification of the surface protection sheet of this invention is demonstrated. As shown in FIG. 3, the surface protection sheet 1 a includes an impact absorbing sheet 2 and hand-cut films 3 and 4 that are bonded along both sides of the impact absorbing sheet 2. This surface protective sheet 1 a is also wound in a roll shape so that the adhesive surface 41 of one hand-cuttable film 4 overlaps the uneven surface 31 of the other hand-cuttable film 3.

  In this example, the shock absorbing sheet 2 is composed of a single polyethylene foam sheet. According to this, by constructing the shock absorbing sheet 2 with only the foam sheet, hand cutting performance is further improved as the strength of the shock absorbing sheet is lowered. In addition, material costs can be reduced.

  Similar to the above-described example, when the surface protective sheet 3 is wound in a roll shape on the surface of the first hand-cut film 3, the other hand-cut film 4 (hereinafter, the second hand-cut film 4). The uneven surface 31 is provided as a process for weakening the adhesive force to the adhesive surface 41. About the 1st hand-cut film 3 and the uneven surface 31, it is the same as that of previous embodiment. Moreover, since it is the same as that of the said embodiment also about the structure of the 2nd hand cutting film 4, the description is abbreviate | omitted.

  Next, as a second modification, as shown in FIG. 4, the surface protection sheet 1 b is a hand-cut piece that is bonded to the impact-absorbing sheet 2 along one surface (the lower surface in FIG. 4) of the impact-absorbing sheet 2. The film 4 is provided.

  The impact absorbing sheet 2 is composed of a single polyethylene foam sheet. The shock-absorbing sheet 2 is concavo-convexly processed in a lattice shape so that the shock-absorbing sheet 2 itself has a hand cutting property in a predetermined direction. The impact-absorbing sheet 2 having a concavo-convex process in a lattice shape can easily cut the surface protection sheet 1b by hand without using scissors or a cutter because the strength of the recesses is lower than other parts. Can do.

  Furthermore, repulsion is reduced by the uneven processing, and the entire surface protection sheet 1b becomes flexible. As a result, even if the adhesive force of the adhesive surface 41 of the hand-cut film 4 is weakened, it can be peeled off along a right angle surface such as a pillar. Furthermore, it can also be used on easily damaged surfaces such as Shiraki.

  It is preferable that the surface of the shock absorbing sheet 2 to which the hand-cut film 4 is attached is subjected to corona discharge treatment. That is, by performing corona discharge treatment on the surface of the shock absorbing sheet 2, fine irregularities are formed on the surface, thereby further improving the adhesion between the polyethylene foam sheet and the adhesive surface of the hand-cut film 4. it can.

  In this example, the hand-cut film 4 is made of a cross tape having a hand-cut property in two directions, the vertical direction and the horizontal direction, as in the second hand-cut film 4 described above. However, as long as the double-sided pressure-sensitive adhesive tape is hand-cut in two directions, the form may be arbitrarily selected according to the specifications.

  Next, specific examples of the surface protective tape of the present invention will be compared and examined together with comparative examples. First, a sample of the surface protection sheet was produced by the following method. An impact-absorbing sheet was prepared by bonding polyethylene foam sheets having different thicknesses in Examples and Comparative Examples to one surface of a cushioning material sheet provided with an air layer.

  After the first and second hand-cut films described above were bonded to both surfaces of each impact absorbing sheet, the following evaluation tests were performed.

[Re-peeling adhesive strength]
First, in order to measure the re-peeling adhesive strength, a surface protective sheet was attached to a stainless steel plate, and then a peeling test was performed to measure the adhesive strength.
[Adhesion with hand-cut film]
Next, the adhesive force by thermal fusion between the shock absorbing sheet and the first hand-cut sheet was measured. The measurement result was evaluated as “Good” when the measurement result was good, and “X” when the measurement result was poor.
[Comprehensive evaluation of sheet]
Further, the flexibility and strength of the surface protective sheet were also evaluated, and a good one was evaluated as “good” and a poor one as “poor”. Furthermore, comprehensive evaluation was performed, and a good one was evaluated as “◯” and a poor one as “×”.
The evaluation results are shown below.

Example 1
[Foam sheet] 1.0mm
[Re-peeling adhesive strength] 3-5N / 25mm
[Adhesion with hand-cut film] ○
[Sheet flexibility] ○
[Sheet strength] ○
[Comprehensive judgment] ○

<Comparative example 1>
[Foam sheet] None [Re-peeling adhesive strength] 3 to 5 N / 25 mm
[Adhesion with hand-cut film] ×
[Sheet flexibility] ○
[Sheet strength] ×
[Comprehensive judgment] ×

<Comparative example 2>
[Foam sheet] 0.5mm
[Re-peeling adhesive strength] 3-5N / 25mm
[Adhesion with hand-cut film] ×
[Sheet flexibility] ○
[Sheet strength] ×
[Comprehensive judgment] ×

<Comparative Example 3>
[Foam sheet] 2.0mm
[Re-peeling adhesive strength] 6-8N / 25mm
[Adhesion with hand-cut film] ○
[Sheet flexibility] ×
[Sheet strength] ○
[Comprehensive judgment] ×

  A summary of the results of Example 1 and Comparative Examples 1 to 3 is shown in Table 1 below.

  According to the present invention, the following knowledge was obtained. That is, when the thickness of the foam sheet is 0.5 mm or less, the foam sheet is melted by heat at the time of heat-sealing, and thus production cannot be performed. On the contrary, if the thickness exceeds 2.0 mm, the flexibility of the sheet is lost and the removability becomes poor. However, if the adhesive force is increased, the adherend may be damaged, which is not preferable.

  In this example, the surface protection sheet 1 has been described as an example of using as a curing sheet for protecting pillars and furniture from scratches when moving, etc. However, as an application other than this, an infant has a sharp point such as furniture or a desk It is good also as a protection sheet for hitting a place and preventing injury. Moreover, you may affix on a part of body of a motor vehicle.

  Furthermore, since the shock absorbing sheet 2 has an air layer in the middle, it has a heat insulating effect. Therefore, the surface protective sheet 1 may be attached to the entire window glass or sash and used as a heat insulating sheet.

1, 1a, 1b Surface protective sheet 2 Impact absorbing sheet 21 Foam sheet 22 Buffer material sheet 3 First hand-cut film 4 Second hand-cut film

Claims (9)

In the surface protection sheet that is attached to the surface of the adherend to be protected and protects the adherend from external impacts,
While sandwiching both sides of a shock-absorbing sheet having a predetermined width having shock-absorbing properties with a hand-cutting film having hand-cutting properties, either one of the hand-cutting films is attached to the adherend. A surface protective sheet provided with an adhesive surface.   2. The surface protection sheet according to claim 1, wherein the impact absorbing sheet is composed of a foam sheet and a cushioning sheet having an air layer inside.   The surface of any one of the above hand-cut films is subjected to a treatment for weakening the adhesive force to the above-mentioned adhesive surface, and the above-mentioned adhesive of the one above-mentioned hand-cut film on the surface of the other hand-cut film. The surface protective sheet according to claim 1 or 2, wherein the surface protective sheet is wound in a roll shape so that the surfaces come into contact with each other.   The surface protective sheet according to claim 1, 2 or 3, wherein the pressure-sensitive adhesive surface is made of a re-peelable pressure-sensitive adhesive.   The one hand-cut film is composed of a uniaxially stretched film having hand-cut characteristics in one direction, and the other hand-cut film is composed of a double-sided pressure-sensitive adhesive tape having hand-cut characteristics in two directions. The surface protection sheet of any one of Claims 1 thru | or 4. In the surface protection sheet that is attached to the surface of the adherend to be protected and protects the adherend from external impacts,
A shock-absorbing sheet having a predetermined width having shock-absorbing properties, and a hand-cutting film having hand-cutting properties, and a weak portion where the strength of the shock-absorbing sheet is weakened is part of the shock-absorbing sheet. A surface protective sheet, which is formed in a streak shape along a predetermined direction, and wherein the hand-cut film is adhered to at least one surface of the shock absorbing sheet.   The surface protection sheet according to claim 6, wherein the impact absorbing sheet is made of a foam sheet, and the foam sheet is subjected to a grid-like unevenness process as the weakening means.   The surface protection sheet according to claim 6 or 7, wherein the hand-cut film comprises a double-sided pressure-sensitive adhesive tape having hand-cut characteristics in two directions, ie, a vertical direction and a horizontal direction.   The corona discharge treatment for improving the adhesiveness with the said double-sided adhesive tape is given to the surface to which the said double-sided adhesive tape of the said impact-absorbing sheet is affixed, The Claim 5 or 8 characterized by the above-mentioned. Surface protection sheet.

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