JP2002103502A - Retroreflective laminate and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll-shaped non-bulky retroreflective laminate convenient to keep and transport, and a method for manufacturing the roll-shaped non-bulky retroreflective laminate generating no waste material. SOLUTION: The roll-shaped non-bulky retroreflective laminate includes a roll-shaped support and the retroreflective sheet fixed to the surface of the support through an adhesive layer, and the support has a thickness of 100-500 μm. The roll-shaped non-bulky retroreflective laminate is manufactured by a process (a) for applying an adhesive to the support to form the adhesive layer applied support, a process (b) for laminating the retroreflective sheet on the adhesive layer of the adhesive layer applied support to form a laminate and a process (c) taking up the laminate in a roll form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roll-shaped retroreflective laminate and a method for producing the same. More particularly, the present invention relates to a roll-shaped integrated laminate of a retroreflective sheet and a support, and a method for producing such a laminate.

[0002]

2. Description of the Related Art A construction signboard using a retroreflective sheet is generally used so that a driver of a car or the like can recognize the presence of a construction site at night. For example, when the retroreflective sheet is irradiated with the light of a running automobile (for example, the light of a headlight), most of the reflected light returns, and the driver of the automobile or the like easily recognizes the existence. be able to.

A construction signboard using a retroreflective sheet is generally manufactured by bonding a retroreflective sheet with an adhesive layer to a support to form a laminate, and fixing the laminate to a frame of the construction signboard. Have been. The retroreflective sheet with an adhesive layer generally has a release paper (which may be a plastic film such as polyester) for protecting the adhesive layer on the back surface of the sheet. The surface of the release paper that is in contact with the adhesive layer is usually subjected to a release treatment such as silicone to facilitate release of the release paper from the adhesive layer.
When trying to manufacture the above-described laminate using the adhesive layer-containing retroreflective sheet having such a release paper, when the retroreflective sheet was attached to the support, the laminate was separated from the adhesive layer of the retroreflective sheet. Release paper is generated as waste.
Further, after the use is completed, a large amount of waste is generated such that the support on which the retroreflective sheet is stuck becomes waste.

[0004] In order to prevent waste, if a release paper of a retroreflective sheet with an adhesive layer is used as a support and the release paper is not peeled off and is directly attached to a construction signboard (generally, a square pipe or the like) For a frame made of a structural material, a screw is passed through a laminate including a retroreflective sheet and a support, and the screw is screwed into a screw hole of the frame to fix the laminate.) Since the adhesive sheet is not firmly adhered to the reflective sheet, the retroreflective sheet may peel off from the support. Such peeling causes, for example, floating (partial peeling) of the retroreflective sheet from the support, resulting in poor appearance.

At present, as a support of a retroreflective sheet for manufacturing a signboard for construction, a support of 0.2 mm to 0.3 m is mainly used.
m metal support such as a zinc iron plate, or 1 mm to
A thick plastic support such as a foamed polypropylene plate or a foamed PVC plate of about 4 mm is used. With these low-flexibility supports, the support cannot be wound into a roll and used as a raw material. For example, according to the TOUGH SAFETY INDUSTRY CATALOG (1996 version), a construction signboard using 1.5 mm expanded polypropylene as a support for a reflection sheet is introduced. However, in the case of 1.5 mm expanded polypropylene, it is wound up as a raw material, and thereafter,
It is not possible to manufacture a laminate while unwinding the raw material. Therefore, it is necessary to manufacture a retroreflective sheet with an adhesive layer having a release paper in advance, peel the release paper from the sheet, and then bond the adhesive layer of the retroreflective sheet to a foamed polypropylene plate. As a result, release paper is generated as waste material.

On the other hand, Japanese Patent Application Laid-Open No. 9-1715 discloses a retroreflective laminate including a retroreflective sheet, an adhesive layer and a flexible support. This retroreflective laminate is intended to be mainly attached to a special adherend such as a concrete adherend. That is,
The disclosed invention is based on unevenness existing on the surface of concrete,
It is a retroreflective laminate that does not suffer from adverse effects due to moisture, alkaline chemicals, and the like contained therein. According to this publication, the support is a plastic film, and furthermore, the plastic film is preferably a polyester film. The thickness of the support is preferably 2
00 to 5000 μm, particularly preferably 250 to 2000 μm
m. In a suitable thickness range,
For example, when a support having a size of 2000 μm is used, the obtained laminate cannot be wound into a roll. Thus, this publication does not describe at all about winding the retroreflective laminate into a roll. Also, as the support adheres more firmly to the retroreflective sheet,
There is no disclosure of performing any treatment on the surface of the support.

[0007]

As described above, a roll-shaped retroreflective laminate including a roll-shaped support and a retroreflective sheet fixed to the surface of the support via an adhesive layer has hitherto been known. It has not been proposed or implemented. Such a roll-like form is convenient for storage and transportation because the retroreflective laminate becomes compact. Further, it is convenient because it can be used after being cut to a desired length at a construction site. Further, the conventional method of manufacturing a retroreflective laminate has a problem that release paper is generated as waste material. Accordingly, a first object of the present invention is to provide a roll-shaped retroreflective laminate which is not bulky and convenient for storage and transportation. A second object of the present invention is to provide a method of manufacturing an eco-friendly roll-shaped retroreflective laminate which does not use release paper which is a waste material when producing the retroreflective laminate.

[0008]

According to the present invention, there is provided a roll-shaped support, and a retroreflective sheet fixed to the surface of the support via an adhesive layer.
A roll-shaped retroreflective laminate having a thickness of from 00 μm to 500 μm is provided. This roll-shaped retroreflective laminate is not bulky, easy to store and transport,
It can be cut to the desired length on site and used. further,
(A) applying an adhesive on the support to form a support with an adhesive layer; (b) laminating a retroreflective sheet on the adhesive layer of the support with the adhesive layer to form a laminate And (c) winding the laminate into a roll. The method for producing the roll-shaped retroreflective laminate described above, comprising: In this method, since no release paper is used, no waste material is generated and the method is environmentally friendly.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Retroreflective Sheet In the practice of the present invention, the retroreflective sheet may be of any structure commonly used in the art, and The sheet can be manufactured according to conventional techniques. In particular,
The retroreflective sheet is a prism type reflective sheet, a capsule lens type reflective sheet, an enclosed lens type reflective sheet, an exposed lens type reflective sheet, or the like. Such retroreflective sheets are commercially available. For example, prismatic reflective sheets are available from 3M Corporation in the United States.
For 70G (product number), the encapsulated lens type reflective sheet is 1170 (product number) from Sumitomo 3M, and for the capsule lens type reflective sheet, it is P
Available as V8240I (article number).

Support A plastic film is preferred as the support.
As a plastic film, sufficient mechanical strength,
For example, any generally known plastic film having tensile strength can be used. For example, a plastic film containing, as a main component, a polymer having excellent impact resistance such as polyester, polyvinyl chloride, polyolefin, polycarbonate, and polyvinylidene fluoride can be advantageously used. Further, a polystyrene-based film or an acrylic film containing a modifier such as an elastomer or rubber and having improved impact resistance can also be used. Among the plastic films used in the present invention, polyester films are particularly preferred. This is because the polyester film has high strength against pulling or tearing and has excellent chemical resistance, so that in the production of a roll-shaped retroreflective laminate, the support is hardly damaged, and the applied adhesive This is because it is resistant to components such as a solvent in the agent.
In addition, since this film has excellent heat shrink resistance, peeling between the retroreflective sheet and the adhesive layer due to shrinkage of the film due to an increase in external temperature can be prevented.

[0011] The thickness of the plastic film is 100
The range is from μm to 500 μm, preferably from 200 μm to 300 μm. If the thickness of the film is less than 100 μm,
There is a possibility that a sufficient tear strength required for fixing to the frame of the construction signboard may not be obtained. Conversely, if it is thicker than 500 μm, it tends to be difficult to wind up as a roll. Further, the thickness of the support is set to 100 to 50.
When the thickness is 0 μm, a roll-shaped support can be obtained, and a retroreflective laminate can be manufactured while unwinding the roll-shaped support.

Adhesive Layer The adhesive layer can be formed using a usual adhesive for fixing the retroreflective sheet and the support. For example, an adhesive containing an adhesive material such as an acrylic resin, an epoxy resin, a polyurethane resin, a polyvinyl chloride resin, a silicone resin, or a natural or synthetic rubber is applied on a support by a common application technique, and an adhesive layer is applied to the surface thereof. Is formed. Suitable adhesives are acrylic adhesives, particularly preferably acrylic pressure-sensitive adhesives. Such an adhesive has good adhesiveness to a plastic film such as a polyester film. In particular, an acrylic pressure-sensitive adhesive having good adhesion to a polyester film is an adhesive mainly containing a copolymer of isooctyl acrylate and acrylic acid. The thickness of the adhesive layer is not particularly limited.
５０50 μm.

Rolled Retroreflective Laminate In the present invention, the retroreflective laminate comprises a support and a retroreflective sheet fixed to the surface of the support via an adhesive layer. The roll-shaped retroreflective laminate refers to a laminate obtained by winding such a laminate into a roll. FIG. 1 shows a roll-shaped retroreflective laminate of the present invention.
A cross-sectional view of the embodiment is shown. The roll-shaped retroreflective laminate 1 is obtained by fixing a retroreflective sheet 4 to the surface of a roll-shaped support 2 via an adhesive layer 3. The roll-shaped retroreflective laminate is unwound, cut into a desired length, and provided for use. For example, when trying to obtain a retro-reflective construction signboard, the roll-shaped retroreflective laminate 1 is unwound at the work site, and the required length is adjusted according to the size of the construction sign frame. The laminate is cut, and the laminate is fixed to the frame of the construction signboard using screws. In this case, for example, a plurality of screw holes are formed in the frame, and a plurality of holes through which screws are passed are formed near the periphery of the laminated body corresponding to the positions of the screw holes. Alternatively, the rolled retroreflective laminate may be cut out to a length desired by a user while unwinding the rolled retroreflective laminate, and then transported to the site for use.

Since the laminate including the support and the retroreflective sheet as described above is relatively tough, there is no need to reinforce the laminate by attaching it to a galvanized sheet or the like conventionally used as a support. The laminate can be fixed directly to the frame. Also, when disposing of construction signs after use,
A laminate using a conventional zinc iron plate or the like as a support is generally
Since it is difficult to peel off the retroreflective sheet and the support, these are currently disposed as industrial waste as one. However, in the present invention, the retroreflective sheet can be separated from the partial laminate including the support and the adhesive layer, and can be divided into the retroreflective sheet and the partial laminate. The retroreflective sheet is recyclable and may be reused as a retroreflective sheet, or if soiled, separate from the partial laminate (in a separate incinerator)
Can be incinerated. The partial laminate can be incinerated separately from the retroreflective sheet. The heat generated by the incineration of the partial laminate and the retroreflective sheet is recycled as energy (thermal recycling)
Is easy. Further, since the partial laminate does not include the retroreflective sheet, it is easy to collect only the support by a separation means such as dissolving the adhesive layer.

In order to prevent the peeling at the interface between the retroreflective sheet and the adhesive layer and the peeling at the interface between the support and the adhesive layer, the surface of the support to which the adhesive is to be applied must have a corona. It is desirable to carry out an adhesion improving treatment such as a discharge treatment.

Manufacturing method of roll-shaped retroreflective laminate The roll-shaped retroreflective laminate can be manufactured as follows. (A) While unwinding a roll-shaped support having a thickness of 100 to 500 µm, an adhesive is applied to one surface thereof to form a support with an adhesive layer. Next, (b) laminating the support with the adhesive layer and the retroreflective sheet via the adhesive layer /
It can be manufactured by fixing and (c) winding the obtained laminate. In addition, the support with an adhesive layer formed in the step (b) can be directly laminated with the retroreflective sheet without winding. Therefore, there is no need to attach release paper to the support with the adhesive layer, and no waste is generated during the production process.

A plastic such as polyester as a support has high solvent resistance and excellent functionality, but as it is, depending on the type of adhesive, sufficient adhesion strength may not be obtained. Therefore, if necessary, in order to improve the adhesion strength between the support and the adhesive layer, the surface of the support to which the adhesive is applied may be subjected to an adhesion improving treatment after the roll-shaped support is unwound. Such processing includes:
Physical surface treatment, chemical surface treatment and mechanical surface treatment are included. The physical surface treatment includes a corona discharge treatment. Surface treatment by corona discharge treatment can improve the wettability of the plastic surface. Corona discharge treatment is a method of applying high frequency and high voltage between electrodes installed in the air and causing the generated electrons to collide with the resin surface, generating active groups on the resin surface and increasing the adhesive force. Yes, it is a general treatment method for modifying the surface of plastic. On the other hand, for the mechanical surface treatment, a method of forming irregularities on the surface such as grain pressing is considered.

[0018]

EXAMPLE 1 A polyester film having a thickness of 250 μm (manufactured by Toyobo Co., Ltd.) was used as a support, and this polyester film was subjected to corona discharge treatment by a corona discharge treatment device.
1170 (manufactured by 3M) as a retroreflective sheet
And an acrylic pressure-sensitive adhesive was used as the adhesive. The polyester film subjected to the corona discharge treatment was wound into a roll to obtain a roll-shaped support. afterwards,
The roll-shaped support was unwound and an adhesive was applied to the surface of the support which had been subjected to corona discharge treatment to form a polyester film with an adhesive layer. The retroreflective sheet was pressure-bonded to the polyester film with the adhesive layer to form a retroreflective laminate, which was rolled up to obtain a roll-shaped retroreflective laminate. This roll-shaped laminate is 550 mm × 14
It was cut to 00 mm and fixed to a construction signboard frame by screws in a usual manner to produce a construction signboard. The construction sign on which the above-mentioned laminate is fixed is left outdoors for 3 months, and thereafter the laminate is visually inspected for deformation, deformation or peeling between the retroreflective sheet and the support with an adhesive layer and appearance. Was inspected. As a result, it was confirmed that the laminate was fixed to the frame without any appearance defects such as deformation and peeling between the retroreflective sheet and the support with the adhesive layer.

Example 2 A laminate was formed and fixed to a construction signboard frame in the same manner as in Example 1, except that PV8240I (trade name, manufactured by 3M) was used as a retroreflective sheet. Was. As a result, it was confirmed that the laminate was fixed to the frame without any appearance defects such as deformation and peeling between the retroreflective sheet and the support with the adhesive layer.

[0020]

The roll-shaped retroreflective laminate of the present invention is not bulky, is easy to store and transport, and can be used by cutting it to a desired length on site. Since the retroreflective laminate can be manufactured without using any release paper, no waste material is generated and the environment is friendly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a roll-shaped retroreflective laminate of the present invention.

[Description of Signs] 1 ... Rolled retroreflective laminate 2 ... Rolled support 3 ... Adhesive layer 4 ... Retroreflective sheet

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Satoshi Odaka 6-2-40 Nakanoshima, Kita-ku, Osaka-shi, Osaka Nakanoshima Intes Building 18F Sumitomo 3M Co., Ltd. Osaka branch F term (reference) 2H042 EA01 EA16 4F100 AK41 AT00A BA02 DA20 EA021 EC012 EC182 EJ55 EJ641 EJ943 GB07 GB90 JL05 JN06B

Claims (4)

[Claims] 1. A roll-shaped support, comprising: a retroreflective sheet fixed to the surface of the support via an adhesive layer;
The roll-shaped retroreflective laminate, wherein the thickness of the support is 100 μm to 500 μm. 2. The retroreflective laminate according to claim 1, wherein the surface of the support has been subjected to an adhesion improving treatment. (3) a step of applying an adhesive on the support to form a support with an adhesive layer; and (b) laminating a retroreflective sheet on the adhesive layer of the support with the adhesive layer. The method for producing a roll-shaped retroreflective laminate according to claim 1, comprising: forming a laminate; and (c) winding the laminate into a roll. 4. The retroreflective laminate according to claim 3, wherein in the step (a), an adhesive layer is formed on the support after the surface of the support is subjected to an adhesion improving treatment. Production method.