JPH077184Y2 - Back side thermosensitive color label sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a so-called thermal label material sheet that is printed with a thermosensitive color developing agent, and in particular, a backside thermosensitive coloring type in which the coloring surface is protected by the label itself. Regarding label sheets.

[Conventional technology and problems to be solved]

In recent years, a bar code label that encodes and displays information about various contents of a product is generally used as a label for appropriately managing the product at the distribution stage in the market. Such a bar code is designed to optically read an array of thin bars by a bar code reader.
If the product becomes unclear due to dirt or friction during handling, it may cause misreading.

Conventionally, a means such as over-lamination in which a printing surface is further covered with a transparent film to protect the display surface of the label is generally known. However, in the case of a bar code label, the label user often prints on the label base paper individually with a thermal printer or the like, which the label user himself / herself corresponds to the content of the product. It is remarkably complicated work for the label user to apply the lamination again. Therefore, it is desired to provide a label base paper, that is, a label sheet in such a form that a label such as a bar code is printed on the label and is already protected from the outside.

[Means for Solving the Problems]

The problem of the prior art is that a film made of a transparent thermoplastic resin having a thermosensitive color former layer on one side is bonded to the printing surface of a label mount via a pressure sensitive adhesive layer. This is achieved by the backside heat-coloring type label sheet.

[Action]

The backside thermo-colorable label sheet of the present invention allows a label user to print a bar code from the front side of a transparent film of a label by a thermal printer operating in conjunction with a computer so that the heat from the thermal head is transferred to the bottom side through the film. Then, the predetermined bar code is transferred to the heat-sensitive color developing agent layer and color-printed on the lower surface of the transparent film.

In the label adhered to the adherend in this state, the printed surface of the barcode is on the lower surface of the transparent film and is not exposed to the outside, so the printed surface does not get dirty or scratched like a normal label. It never happens.

In addition, on the surface side of the label substrate to which the transparent film is laminated, a frame or background pattern, and in some cases, common items for each label such as a company name are printed in advance, and a barcode or the like is formed by thermal color printing. If each label is printed on the back surface of the film, all of these prints can be displayed to the outside through the transparent film.

The label sheet of the present invention supplies a thermoplastic resin layer between a process paper and a film in a molten state, then solidifies by cooling and solidifying, and after applying a thermosensitive coloring agent to the back surface of the film, a predetermined printing is performed. It is easily manufactured by laminating a plain or plain label mount with a conventional pressure sensitive adhesive.

In practice, individual labels are punched out by die cutting in a state where the process paper is further removed and the film is exposed, and a release paper is combined with the back side of the label mount via an adhesive if necessary.

The thermoplastic resin supplied between the transparent film and the process paper during the production of the sheet is made of a material different from that of the film and has a melting point lower than that of the film. Particularly preferred is a combination with a polyethylene terephthalate excellent film, which is easy to obtain and melt, and a polyethylene resin. In this case, if the melting temperature of polyethylene is set to about 300 to 315 ° C, which is slightly lower than the normal lamination temperature, the resin layer adheres to the process paper side with sufficient strength, but it does not adhere to the film at the time of melting. It is welded only by wetting, and when cooled and solidified, it is easily peeled off with a peel strength of about 100 g / 2.5 cm, and no tackiness remains on the peeled surface (hereinafter, such a bonded state is referred to as lead bonding).

The lead adhesion is obtained when the film and the thermoplastic resin layer different in material from the film are welded to each other.

Further, in order to smoothly and surely separate the lead-bonded portion, it is preferable that the same kind of resin as the resin to be melt-fed, such as polyethylene, be fixed in advance on the back surface of the process paper at a normal lamination temperature.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the embodiments shown in the drawings.

The first time is a cross-sectional view showing a state at the time of manufacturing a backside thermosensitive coloring type label sheet as one embodiment of the present invention.

Such a label sheet is, for example, a back surface of a process paper 5 having an appropriate paper quality and a transparent polyethylene terephthalate film (hereinafter referred to as PET film) 2 having a thickness of about 3.5 μ.
The polyethylene resin (PE resin) is heat extruded at a temperature of about 300 to 315 ° C, which is slightly lower than the normal laminating temperature, and PET is applied while being pinched by a cooling roller (not shown).
Fused to film 2, cooled and solidified to a thickness of about 30μ
A polyethylene resin layer (hereinafter referred to as PE layer) 6 of
Next, a commercially available thermosensitive color former is applied to the lower surface of the PET film 2 to form the color former layer 1.

In this case, between the PET film 2 and the PE layer 6 which are different thermoplastic resins, the PET film 2 when the PE layer 6 is melted
The bonding state caused by wetting to the surface of the above remains as a lead bonding state having a 180 ° peel strength of 100 g / 2.5 cm even after they are solidified by cooling.

In this case, the PET film 2 has a thickness of about 3.5μ and low rigidity, and the workability such as coating and winding is poor by itself, but since the process paper 5 is lead-bonded to the upper surface of the PET film 2, it is relatively easy to handle. It will be easy. Further, since the process paper 5 is releasably fused to the PET film 2 via the PE layer 6, it can be easily peeled off from the PET film 2 at the time of die cutting which will be described later.

In the actual label base paper, the pressure-sensitive adhesive layer 3 shown in FIG.
2 has an ordinary label mount 7 interposed therebetween, and a release paper 10 is attached to the label mount 7 via another pressure-sensitive adhesive layer 9. It is preferable that the surface of the label mount 7 is preliminarily provided with a print 8 common to each label, such as a ground pattern, a frame and a company name.
In such a specific example, the process paper is removed from the laminated body including the process paper 5, the film 2, the label mount 7, the release paper 10, and the like,
Die cutting is performed from the surface side of the film 2 to obtain a label raw material having a label 11 as shown in the second illustration.

When a label user uses such a label 11,
For example, while the label tape wound in a roll shape is unwound from the state of the plan view shown in FIG. 3, a predetermined bar code is printed from the upper surface of the PET film 2 of the label 11 by the head of the thermal printer.

The heat output of the head is transferred to the color-forming agent layer 3 on the lower surface via the PET film 2 and the barcode is color-printed.
In this case, the PET film 2 is about 3.5μ thick,
The heat-sensitive color former of the color former layer 1 exhibits the same heat-sensitive color development as when direct thermal printing is performed directly on the front side of the surface to be printed by an ordinary thermal head, and a clear bar code on the back surface of the transparent PET film 2 Is printed.

In this way, the barcode 12 that has been color printed on the inner surface of the label
At the same time, the printed portion 8 such as a ground pattern which is preprinted on the upper surface of the label mount 7 can be read by the barcode reader through the transparent PET film 2, but these printed portions are PE.
Since it is covered and protected by the T film 2 from the outside, there is no risk of misreading due to dirt or scratches.

As described above, in the label sheet of the present invention, the label film itself serves as a protective film for the printing portion, and therefore the label user does not need to take protective measures such as over-lamination after printing.

Further, since the label surface is made of a transparent thin plastic film, it is excellent in appearance and water resistance when it is attached to a product.

The combination of the PET film and the PE layer in the above examples can be selected from any other combination of different thermoplastic resin materials, for example, a combination of an oriented polypropylene film and a PE layer can also be used.

[Effect of device]

According to the present invention, the bar code display or the like on the label is already protected from the outside by the label itself at the time of printing, so there is no possibility of being soiled from the outside.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state of a manufacturing process of a label sheet of the present invention, FIG. 2 is a sectional view showing a completed state of a label sheet as an embodiment of the present invention, and FIG. FIG. 1 ... Coloring agent layer 2 ... PET film 3 ... Pressure-sensitive adhesive layer 4 ... Release paper 5 ... Process paper 6 ... PE (polyethylene) layer 7 ... Label mount 8 ... Printing section 9 ... Pressure-sensitive adhesive layer 10 …… Release paper 11 …… Label 12 …… Bar code

Claims (4)

[Scope of utility model registration request] 1. A film 2 made of a transparent thermoplastic resin having a heat-sensitive color former layer 1 on the back surface thereof is bonded to a printing surface 8 of a label mount 7 via a pressure-sensitive adhesive layer 3. A backside thermosensitive color label sheet. 2. The sheet according to claim 1, wherein the process paper 5 is releasably bonded via a thermoplastic resin layer 6 made of a material different from that of the film 2 supplied in a molten state. 3. A pressure sensitive adhesive layer 9 on the back surface of the label mount.
The sheet according to claim 1, wherein the release paper 10 is attached via the sheet. 4. The sheet according to claim 1, wherein the film 2 is made of polyethylene terephthalate, and the thermoplastic resin layer 6 is made of polyethylene.