JPH1039760A - Iteratively usable seal and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain seals which have an excellent three-dimensional feel and iteratively usable as replacements for thumbtacks, bookmarks, stamps, etc., exclusive of ornaments by joining displays of patterns, etc., formed by molding soft thermoplastic resins in relief to the surfaces of seal substrates having flexibility, thereby forming tacky adhesive layers on the rear surfaces of the seal substrates. SOLUTION: The displays 2 consisting of the patterns, characters, symbols or their respective bonds or the bonds to colors formed by molding the soft thermoplastic resins in relief are joined by a high-frequency heating machine to the surfaces of the seal substrates 1 which are thermally adherable or thermally meltable with the displays 2 (the sheets thermally adherable therewith are, for example, thermosetting resin sheets, polyurethane sheets, etc., and the sheets thermally fusible therewith are thermoplastic resins) and have flexibility. Repeelable and restickable tacky adhesive layers 3 are formed on the rear surfaces of the seal substrates 1. The surfaces having these tacky adhesive layers 3 are peelably adhered onto backing paper 4 consisting of release finished paper, synthetic resin films or sheets. The seal substrates 1 are fusion cut or cut slightly larger nearly along the contours of the displays 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal that can be repeatedly used, for example, for a girl or a child to enjoy by attaching it to a notebook, a bag or the like as a hobby, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In general, this type of seal is provided with a display such as a character or a fantasy picture pattern on the surface of a sheet by printing, and an adhesive is applied on the back surface of the sheet.

[0003]

However, the printed picture pattern is planar and poor in three-dimensional appearance and variability. SUMMARY OF THE INVENTION It is an object of the present invention to provide a seal which is rich in three-dimensional appearance and has a versatile use such as a substitute for a thumbtack, a bookmark or a stamp in addition to decoration, and a method for manufacturing the same.

[0004]

SUMMARY OF THE INVENTION A seal which can be used repeatedly according to the present invention has a display member formed by embossing a soft thermoplastic resin into a flexible shape which can be thermally bonded or welded to the display member. An adhesive layer which is bonded to a front surface of the seal substrate and has a re-peelable and re-stickable surface is formed on a back surface of the seal substrate. Here, the term “display body” has a meaning including a pattern, a character, a symbol, or a combination thereof, or a combination of these with a color (hereinafter, the same in the present specification). In addition, the above-mentioned thermal bonding refers to a case where only a soft thermoplastic resin is melted by heat and adheres to the surface of a seal substrate, and the thermal bonding refers to a case where both the soft thermoplastic resin and the surface of the seal substrate are heated. Melting and fusing. A soft polyvinyl chloride may be used as the thermoplastic resin of the display body, and a heat-sealable thermoplastic resin having the same flexibility as that of the display body may be used as the seal substrate. Alternatively, a flexible polyethylene terephthalate sheet that can be thermally bonded may be used. The pressure-sensitive adhesive layer uses a polyurethane pressure-sensitive adhesive.

[0005] Also, a reusable seal of the present invention is:
As a seal substrate, a flexible polyethylene terephthalate surface is used, which is obtained by polymerizing a polyvinyl chloride film for increasing the mounting strength on a surface of the flexible polyethylene terephthalate, and a display member formed of soft polyvinyl chloride is formed on the polyvinyl chloride film. May be joined.

The seal which can be used repeatedly according to the present invention is obtained by heating a soft thermoplastic resin molded into an appropriate shape onto the surface of a flexible seal substrate which can be heat-bonded or welded to the thermoplastic resin. Bonding, on the back of the seal substrate,
It can be manufactured by forming an adhesive layer that can be peeled off and re-attached.

[0007] Also, a reusable seal of the present invention is:
Using a soft thermoplastic resin molded into an appropriate shape and a flexible seal substrate having an adhesive layer that can be thermally bonded or thermally welded to the thermoplastic resin and that can be re-peeled and re-adhered to the back surface. Then, the thermoplastic resin may be bonded to the surface of the seal substrate by a high-frequency heater within a time that does not adversely affect the adhesive strength of the adhesive layer.

In these production methods, soft polyvinyl chloride is used as a soft thermoplastic resin, a flexible polyethylene terephthalate sheet is used as a flexible sealing substrate, and a polyurethane pressure-sensitive material is used as an adhesive layer. It is preferable to use an adhesive.

[0009]

The display body formed in relief by the thermoplastic resin can be floated on the surface of the seal substrate to give a three-dimensional appearance, and an interesting one can be obtained. The embossed display body can be used for a stamp by applying stamp ink thereto. In addition, since the display body is soft and the seal substrate (polyethylene terephthalate) is flexible, the seal substrate can be easily removed and re-attached by grasping the seal substrate. Since the display body is easily deformed, it is possible to prevent the display body from peeling off from the seal substrate.

By forming the pressure-sensitive adhesive layer with a polyurethane pressure-sensitive adhesive, it can be repeatedly adhered,
The sticking place and the object to be stuck can be freely changed. When the adhesive strength decreases, the adhesive strength can be returned to the original state by washing and drying the adhesive layer.

According to the above-mentioned manufacturing method, the display body and the sealing substrate can be securely joined without adversely affecting the adhesive strength of the adhesive layer, and in particular, the thermoplastic resin can be re-peeled and re-adhered to the back surface. Adopting a method of bonding with a high-frequency heater within a time that does not adversely affect the adhesive force of the adhesive layer on the surface of the seal substrate having the layer, the seal substrate having the adhesive layer is mass-produced and cut to a predetermined size, The productivity can be improved as compared with a case where a thermoplastic resin can be joined and an adhesive layer is formed for each seal having a display body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view of a seal that can be used repeatedly according to the present invention, FIG. 2 is a cross-sectional view of the seal, and FIG. 3 is a schematic cross-sectional view of an apparatus for manufacturing the seal.

In FIG. 1 and FIG. 2, a seal which can be used repeatedly is a display body 2 comprising a pattern, a letter or a symbol or a combination thereof or a combination of these with a color formed by embossing a soft thermoplastic resin. Can be thermally bonded or thermally welded to the display 2 (for example, a thermosetting resin sheet, a polyurethane sheet, a synthetic leather sheet, or an artificial leather sheet). (Resin) Bonded to the front surface of a flexible seal substrate 1 with a high-frequency heater, and formed on the back surface of the seal substrate 1 with an adhesive layer 3 that can be re-peeled and re-attached. Is releasably adhered onto a backing paper 4 made of release-processed paper or a synthetic resin film or sheet. The seal substrate 1 is blown or cut substantially along the contour of the display body 2 and slightly larger than that. As the soft thermoplastic resin of the display 2, soft polyvinyl chloride, polyvinylidene chloride, or the like is preferable for high-frequency bonding because of a large dielectric loss. As the thermosetting resin of the flexible seal substrate 1, a polyethylene terephthalate sheet having excellent heat resistance is preferable.

In order to form the display body 2 and join it integrally with the seal substrate 1, as shown in FIG. 3, a lower die 6 having a concave portion 5 for forming a display body and a pressing die 7 are prepared. FIG.
As shown in (A), the concave portion 5 of the lower mold 6 is filled with a solution (including sol) or powder of a thermoplastic resin 8 such as soft polyvinyl chloride. At that time, an appropriate coloring agent is added as needed. Thereafter, the display unit 2 is prepared by heating the lower mold 6 filled with the thermoplastic resin 8 to cure the thermoplastic resin 8. Next, the sealing substrate 1 made of the polyethylene terephthalate sheet or the like is placed on the lower die 6 and then pressed by the pressing die 7 from above as shown in FIG. The surface of the display 2 is bonded to the surface of the seal substrate 1 by heat bonding or heat welding by generating heat at the interface between the substrate 2 and the seal substrate 1. For example, the display 2 is colored and opaque, and the seal substrate 1 serving as the background of the display 2 is formed to be colorless and transparent.

Next, the display body 2 and the seal substrate 1 which are joined and integrated are taken out from the lower mold 6 and the pressing mold 7, and an adhesive layer 3 which can be peeled off and re-attached is formed on the back surface of the seal substrate 1. The pressure-sensitive adhesive layer 3 is made of a polyurethane pressure-sensitive pressure-sensitive adhesive, which is produced by a reaction between a polyol and an organic diisocyanate. More specifically, a prepolymer having a terminal isocyanate group obtained by reacting one or more polyol mixtures having an average number of functional groups of 2 to 2.6 with an excess of organic diisocyanate is used. And one or more polyol mixtures whose sum with the average number of functional groups of the polyol mixture as a component of the prepolymer exceeds 4 and is not greater than 5 have an NCO / OH equivalent ratio of 0.65 to 1.
The polyurethane obtained by reacting at 15 is preferred.

In the above manufacturing method, after the display body 2 is bonded to the surface of the seal substrate 1, the adhesive layer 3 is formed on the back surface of the seal substrate 1.
However, the present invention is not limited to this. By using a flexible seal substrate 1 having an adhesive layer 3 that can be re-peeled and re-adhered on the back surface, the soft heat The display 2 made of a plastic resin may be joined by a high-frequency heater. In this case, it is necessary to heat-bond or heat-bond the adhesive layer 3 of the seal substrate 1 in a short time so as not to adversely affect the adhesive strength of the adhesive layer 3 without heating. According to the experiment, if the heat bonding or heat welding is performed in a short time of 30 seconds to 1 minute using a high frequency heating machine (high frequency welding machine) having an output of 20 KW and a flowing current of 1.5 A, the adhesion of the adhesive layer 3 is reduced. It turns out that there is no practical problem with the force.

FIG. 4 shows another embodiment. In this embodiment, as a flexible sealing substrate 1, polyvinyl chloride 1 is placed on a polyethylene terephthalate sheet 1a.
b coated with polyvinyl chloride 1b
A flexible display body 2 formed of polyvinyl chloride is joined to the above with a high-frequency heater. According to this, since polyvinyl chloride having a large dielectric loss is bonded by high frequency, it can be beautifully bonded and has a large adhesive force (welding force).

The seal of each embodiment is peeled off from the backing sheet 4 and is attached to a cover of a notebook, a bag, a pencil case, or other portable items for decorative purposes, or a stamp is formed by applying ink to the display 2. It can be used and can be a replacement for bookmarks. Further, as shown in FIG. 5, the sticker A can be used as a substitute for a thumbtack, which is to be attached to a layer of an object 10 such as paper and a surface 11 such as a wall or a refrigerator door. In any case, the adhesive layer 3 made of a polyurethane pressure-sensitive adhesive does not migrate to the sticking surface when it is peeled off from the sticking surface such as a notebook or a wall surface. It does not stain the sticking surface. In addition, as shown in FIG. 1, the display 2 has a fine portion 2 a, a blank portion 2 b, and a part 2 forming the display 2.
It is possible that c exists in an island shape.

[0019]

According to the seal of the present invention, since a display body such as a pattern is raised on the surface of the seal substrate, a material rich in three-dimensional effect and full of interest can be easily obtained. Moreover,
This seal can be used not only for decoration, but also for stamps and bookmarks, and it can be easily removed and re-attached by grasping the seal substrate. Can be.

Further, if a polyurethane pressure-sensitive adhesive is used as the adhesive layer, the seal can be used repeatedly many times. If the adhesive layer becomes dirty with dirt or dust and the adhesive strength is reduced, the adhesive layer is washed with water. Drying or wiping can restore the adhesive strength, which is economical.

Further, according to the method of manufacturing a seal of the present invention, the display body and the seal substrate can be securely bonded without adversely affecting the adhesive strength of the adhesive layer. The productivity can be improved by employing a method in which a high-frequency heater is used to bond the surface of the seal substrate having the re-stickable adhesive layer to the surface of the adhesive substrate within a time that does not adversely affect the adhesive strength of the adhesive layer.

[Brief description of the drawings]

FIG. 1 is a plan view of a seal.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a schematic sectional view of an apparatus for manufacturing a seal.

FIG. 4 is a cross-sectional view of a seal showing another embodiment.

FIG. 5 is a front view showing one usage example of a seal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seal board 2 Display body 3 Adhesive layer 8 Thermoplastic resin

Claims (6)

[Claims] 1. A display body such as a pattern formed in an embossed shape with a soft thermoplastic resin is joined to a surface of a flexible sealing substrate capable of being thermally bonded or thermally welded to the display body, and A reusable seal comprising a pressure-sensitive adhesive layer formed on a back surface of a substrate so that the pressure-sensitive adhesive layer can be peeled off and re-attached. 2. The repetitive use according to claim 1, wherein the display body is formed of soft polyvinyl chloride, the seal substrate is made of flexible polyethylene terephthalate, and the adhesive layer is formed of a polyurethane pressure-sensitive adhesive. Possible seal. 3. A sealing substrate made of a flexible polyethylene terephthalate having a surface polymerized with a polyvinyl chloride film, and formed on the polyvinyl chloride film in an embossed shape with soft polyvinyl chloride. A reusable seal, wherein a display body is joined by heat welding, and a re-peelable and re-stickable adhesive layer is formed on a back surface of the seal substrate. 4. A soft thermoplastic resin molded into an appropriate shape is bonded to the surface of a flexible seal substrate which can be thermally bonded or thermally welded to the thermoplastic resin by heating.
A method for producing a seal that can be used repeatedly, wherein an adhesive layer that can be re-peeled and re-adhered is formed on the back surface of a seal substrate. 5. A flexible thermoplastic resin formed into an appropriate shape, and a flexible layer having an adhesive layer that can be thermally bonded or welded to the thermoplastic resin and that can be re-peeled and re-adhered to the back surface. Using a seal substrate, the thermoplastic resin is bonded to the surface of the seal substrate by a high-frequency heater within a time period that does not adversely affect the adhesive force of the adhesive layer. Method. 6. A flexible thermoplastic resin, wherein a soft polyvinyl chloride is used as a soft thermoplastic resin, a flexible polyethylene terephthalate is used as a flexible seal substrate, and a polyurethane pressure-sensitive adhesive is used for an adhesive layer. 4 or Claim 5
A method for producing the described reusable seal.