JP2004230637A - Protecting sheet body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a significant cost reduction while securing a function as a protecting sheet, with regard to a protecting sheet body to be used in the way of pasting it to the surface of a building material or the like in order to protect the building material and the like in a building construction or its interior finish work. <P>SOLUTION: This protecting sheet body 16 is manufactured through the following procedures: first, a rubber-based hot-melt tacky resin 12 is applied or sprayed to the surface of a base material 10 composed of a nonwoven fabric 14 with a rough surface; a meshy paper or the nonwoven fabric 14 is contact-bonded to the base material 10. In this case, the base material 10, the meshy paper or the nonwoven fabric 14 is integrally put together with the help of the tacky resin 12 into the protecting sheet body 16. The numerous small holes 14-l opened in the meshy paper or the nonwoven fabric 14 are filled with the tacky resin 12 and consequently, an appropriate tackiness is imparted to the surface of the protecting sheet body 16 by the tacky resin 12 packed in the small holes 14-1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective sheet that is used by sticking to a surface of a building material or the like to protect the building material or the like in a building or its interior construction work.
[0002]
[Prior art]
A protection sheet is installed in a part of a building or the like where people frequently move or work, in order to protect an object to be protected such as a building material. It is essential for the protective sheet to have good adhesion to the object to be protected and good releasability after use. Conventionally, there has been a rubber sheet type, but recently a disposable type is mainly used. Many of them are used by laminating or laminating a nonwoven fabric on a base material surface such as paper or corrugated cardboard and laying it on a protected surface. Simply laying the sheet makes it easy for an operator to move the sheet by walking on it, and there is inconvenience that the sheet cannot be used on stairs or wall surfaces. Therefore, the back side has been stuck to a double-sided adhesive tape, and the protective sheet itself has been adhered to the protected surface. However, when a double-sided pressure-sensitive adhesive tape is used, there has been a problem that the pressure-sensitive adhesive is too strong and is likely to remain on a floor or a wall surface during peeling. Therefore, the protective sheet has both appropriate adhesiveness that does not easily move during work and peelability that completely peels off after work and leaves no trace of the adhesive on the protected surface. It is necessary to be. For this reason, various types of resins for the protection sheet have been proposed which are specially designed by adding various measures to the components. In addition to the simple structure in which an adhesive resin layer is formed on the base material, there is also a device in which an elastic air layer is provided in the middle to increase the releasability while maintaining the adhesiveness (Patent) Reference 1).
[0003]
[Patent Document 1] JP-A-7-216758
[Problems to be solved by the invention]
The conventional protective sheet has both adhesiveness and releasability by using a special adhesive resin. Therefore, the cost of the adhesive resin is high, and this has caused the high cost of the protective sheet. Further, the multi-layer structure as in Patent Document 1 can be a powerful means for improving the releasability, but the cost is further increased by the multi-layer structure. The present invention has been made in view of the above problems, and a function (adhesiveness and releasability) as a protective sheet is sufficiently ensured, and a special composition adhesive is not required. It is intended.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided the first layer having a rough surface, and the second layer having a myriad of small holes penetrating between the front and back layers and distributed substantially over the entire surface. The second layer is integrated with the first layer under pressure via an adhesive resin layer adhered on the surface of the first layer, and in this integrated state, the adhesive resin has the small holes of the second layer. The protective sheet is characterized in that the adhesive resin filled in the pores imparts appropriate tackiness to the surface of the second layer separated from the first layer.
[0006]
In the present invention, as the first layer having a rough surface, a material having fine irregularities such as paper or pulp nonwoven fabric, particularly a nonwoven fabric is preferable. That is, the adhesive resin can be strongly integrated with the fine unevenness of the first layer.
[0007]
The nature of the adhesive resin is not limited as long as it exhibits the desired adhesiveness. However, from the viewpoint of cost, the first one is commercially available as a hot-melt type rubber-based adhesive. Very common ones can be employed. Although rubber-based pressure-sensitive adhesives are inexpensive in cost, they are considered to be unsuitable for a protective sheet on the premise of peeling, after being cured, they firmly adhere to the surface of the material. Then, in the present invention, the second layer is integrated with the first layer under pressure through the adhesive resin layer adhered on the surface of the first layer, and the first layer is formed by the adhesive resin filled in the small holes. It is possible to impart appropriate tackiness to the surface of the second layer separated from the layer, without being too strong. That is, the pressure-sensitive adhesive resin that has oozed out to the surface side through the small holes of the second layer allows the surface on the side away from the first layer (base material) to have appropriate adhesiveness. When the protective sheet body is used, the protective sheet body is applied to the surface to be protected on the side of a large number of scattered small holes filled with an adhesive, in other words, the protected surface is adhered to the portion where the small hole is formed. The protective sheet is adhered to the surface to be protected by contact with the conductive resin, and in this state, the surface to be protected can be protected by the protective sheet. Then, when the protective sheet body is peeled off after use, the adhesive is weakly integrated because the adhesive and the first layer are firmly integrated but the protected portion is only adhesive through small holes. The protective sheet body can be easily peeled off from the protected surface, and the resin remains firmly and integrally adhered to the first layer, which is the base material, so that even the trace of the adhesive resin remains on the protected surface. It is possible to peel it off.
[0008]
The second layer to be filled with the resin is provided with an infinite number of small holes penetrating the front and back, and is, for example, a mesh-like spunlace nonwoven fabric or a spunbond nonwoven fabric, or a mosquito net formed by paper or various fibers having an infinite number of small holes Sheet or the like.
[0009]
In order to integrate the first layer and the second layer, a hot-melt rubber-based adhesive resin is applied or sprayed on the surface of a material sheet having fine irregularities such as paper or pulp nonwoven fabric constituting the first layer. A mesh-like spunlace nonwoven fabric or a spunbonded nonwoven fabric constituting the second layer on the surface of the adhesive resin coating or spraying, or a mosquito net-like sheet made of paper or various fibers formed with countless small holes is pressurized. Or it is crimped. Therefore, the first layer and the second layer can be integrated with the adhesive resin. Then, the resin slightly protrudes from the mesh-like nonwoven fabric constituting the second layer or the surface of the second layer on the side away from the first layer from the small holes of the perforated paper. The portion is spread out over the entire surface of the second layer, and this portion makes the protective sheet adhere to the surface to be protected. However, the adhesion of the protruding portion of the resin is slight, while Since is a strong adhesive, the resin is pulled toward the base material at the time of peeling, and can be peeled from the protected surface without leaving a trace.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 schematically shows a method for producing a protective sheet according to the present invention, in which (a) shows a first stage, 10 is a base material as a first layer in the present invention, and base material 10 is paper. Alternatively, a material having fine irregularities such as a pulp nonwoven fabric, particularly a nonwoven fabric is preferable.
[0011]
The second stage (b) shows a state in which the adhesive layer 12 is formed by applying an adhesive resin on the surface of the base material 10. The adhesive resin forming the adhesive layer 12 is, for example, a normal type commercially available as a hot-melt type rubber-based adhesive, and the adhesive layer 12 is formed by applying or spraying the adhesive. The coating or spraying may be performed on the entire surface of the base material 10 or may be partially performed such as in a streak shape or a spread shape (dot shape). Then, a mesh-like nonwoven fabric sheet 14 (a paper having an infinite number of small holes may be used) as the second layer is applied from above. In this embodiment, the mesh-like nonwoven fabric sheet 14 has a lattice-like mesh structure as shown in FIG. 3 (in FIG. 3, a broken line indicates a blank portion where the adhesive resin protrudes).
[0012]
FIG. 1C showing the next step (third step) schematically shows the integration of the mesh-like nonwoven sheet or the perforated paper 14 with the base material 10 via the adhesive resin layer 12 by pressing. . As a pressing method, there is a method using a pair of rollers 15A and 15B. That is, the pressure-sensitive adhesive resin is pressed between the base material 10 and the mesh-shaped nonwoven sheet or the perforated paper 14, and both are firmly integrated by the pressure-sensitive resin to form the protective sheet body 16. I do. Since the base material 10 has fine irregularities such as a nonwoven fabric, it can also be used to enhance the integration with the adhesive resin. FIG. 2 is an enlarged view showing a state in which the adhesive resin completely fills the countless small holes 14-1 of the mesh-shaped nonwoven fabric sheet or the perforated paper 14. The adhesive resin filling the small holes 14-1 imparts appropriate adhesiveness to the protective sheet 16 on the side away from the base material 10. That is, assuming a usage state in which the protective sheet body 16 is adhered to the building floor material, the lower surface 16 </ b> A in FIG. 2 is directed outward, and the upper surface 16 </ b> B is the adhered surface to the protected surface 18. FIG. 3 schematically shows the side of the protective sheet to which the mesh-shaped nonwoven fabric sheet or the perforated paper 14 is adhered. In this embodiment, the mesh has a lattice shape, is constituted by rectangular mesh holes, and is indicated by oblique lines. The adhesive resin is exposed (preferably slightly extruded) at the portion of the mesh hole. That is, the protective sheet body 16 is adhered to the protected surface 18 by applying the protective sheet upper surface 16B of FIG. 2 to the protected surface 18 such as a floor surface under construction. Then, since the protected surface 18 contacts only the portion 12-1 of the adhesive resin 12 filled with the small holes, the adhesive state in which the base material 10 and the mesh-shaped nonwoven sheet or the perforated paper 14 are integrated is obtained. In comparison, the adhesiveness between the adhesive surface 16B and the protected surface 18 is considerably weak. However, since the protective sheet body 16 is adhered to the protected surface 18, there is no problem in protecting the protected surface 18. Since the adhesion between the adhesive surface 16B of the protective sheet body 16 and the surface to be protected is much lower than the adhesion to the base material 10, the small holes 14 are used when the protective sheet body 16 is peeled from the surface 18 to be protected. The adhesive resin 12-1 at the portion -1 does not lose its integrity with the adhesive resin 12 on the base material 10, and the protective sheet 16 can be peeled off without leaving a trace of the adhesive resin on the protected surface 18. It becomes.
[0013]
When the protective sheet is used, the surface of the lower surface 16A (nonwoven fabric or paper 10 constituting the base material) in FIG. 2 comes out. That is, in a state where the protective sheet is stuck on the floor of the building material, a person walks on the surface 16A (the surface of the base material 10) to work. Since the base material 10 is formed of a nonwoven fabric sheet or the like, it is difficult to slip and the workability is improved. In addition, the dirt becomes less noticeable by an appropriate printing process, and it becomes possible to use repeatedly instead of disposable once, which is excellent in terms of resource saving.
[0014]
In the illustrated embodiment, the adhesion of the protective sheet body to the pressure-sensitive adhesive layer 12 by pressing the mesh nonwoven sheet or the perforated paper 14 to the pressure-sensitive adhesive layer 12 is performed only on one side of the base material 10. Similar processing can be performed on both surfaces. By being provided on both sides, it is interposed between the floor mat and a toilet mat, a pet sheet, or the like, and is made of rubber or the like.
[Brief description of the drawings]
FIG. 1 is a view showing a manufacturing process of a protective sheet according to the present invention in the order of steps (a) to (c).
FIG. 2 is a schematic enlarged sectional view of a protective sheet of the present invention.
FIG. 3 is a schematic enlarged plan view of the protective sheet of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Base material 12 ... Adhesive layer 14 ... Mesh-shaped nonwoven fabric sheets 15A and 15B ... Roller pair 16 ... Protective sheet 18 ... Protected surface

Claims (1)

A first layer having a rough surface, and a second layer having a myriad of small holes penetrating between the front and back layers and distributed over substantially the entire surface, and is attached on the surface of the first layer. The second layer is integrated with the first layer under pressure through the adhesive resin layer, and in this integrated state, the adhesive resin fills the small holes of the second layer, and the adhesive filled in the small holes A protective sheet body characterized in that the surface of the second layer separated from the first layer is imparted with appropriate tackiness by the conductive resin.

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