JP3075426B2 - Pressure-sensitive adhesive print sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a releasable pressure-sensitive adhesive print sheet used for various notifications having good feed suitability when printing and printing on various printing machines.

[0002]

2. Description of the Related Art Conventionally, a printing sheet having a pressure-sensitive adhesive layer provided on a sheet is used for printing, printing, etc. on the sheet by various printers, and then the adhesive layers are opposed to each other and pressurized and joined. Pressure-sensitive adhesive print sheets that are processed into various notification cards.

[0003] Such a print sheet is convenient to be processed into a size suitable for various kinds of handling and to conceal confidentiality information. In addition, the preservation of this print sheet before printing causes curls and wrinkles, which is not only inconvenient handling during storage, but also hinders feeding, printing, printing, etc. with a printer. Was inconvenient.

[0004] The reason for this is that the purpose of the print sheet is specified and the pressure-sensitive adhesive layer is provided on a specific portion of the print sheet that conforms to the purpose. Is changing the rate,
Conventionally, in order to solve this, various attempts have been made to apply a pressure-sensitive adhesive to the joining surface of the sheet, and various attempts have been made to change the composition of the pressure-sensitive adhesive, but this has not been sufficiently solved. .

[0005]

Therefore, according to the present invention, printing and printing can be performed on both sides of a print sheet.
It can be used for various notification cards so that one side is easily peeled off and the other side is not easily peeled off, and when printing or printing information with a printer without curling, wrinkling etc. easily occurring in normal storage conditions Even when feeding from the stacked state one by one or in a continuous state, and when performing various processing processes after printing or printing information, a feeling that stable handling can be performed without easily generating curls and wrinkles. It is intended to provide a pressure-sensitive adhesive print sheet.

[0006]

A pressure-sensitive adhesive layer capable of receiving a printing agent is provided on substantially the entire front and back surfaces of the sheet, and the coating amount on each surface is ² to 10 g / m ² . In addition, the application amount of the one surface and the other surface is different within a range of 3 g / m ² , and the peel strength after the one surface and the other surface are overlapped and pressure-bonded is different. Pressure-sensitive adhesive print sheet.

[0007]

Since a pressure-sensitive adhesive layer capable of receiving a printing agent is provided on substantially the entire surface of the front and back surfaces of the sheet, the entire front and back surfaces of the sheet are under the same conditions. As the whole expands and contracts uniformly, curl,
Printing can be performed at desired locations on a sheet under the same conditions without easily causing wrinkles or the like.

[0008]

Next, the present invention will be described with reference to the drawings showing one embodiment of the present invention.

FIG. 1 is a cross-sectional view of a pressure-sensitive adhesive print sheet 10 according to the present invention. The print sheet 10 has a pressure-sensitive adhesive on one side and the other side of the sheet 1 capable of receiving a printing agent. Adhesive layers 2 and 3 are provided.

[0010] The sheet in the above is made of high quality paper, medium quality paper,
Coated paper, recycled paper, synthetic paper and the like can be used.

Pressure-sensitive adhesive layers 2, 3 capable of accepting printing agent
As the pressure-sensitive adhesive for use, an adhesive obtained by dispersing fine particles having an average particle diameter of 10 m to 30 m in an adhesive base mainly composed of a natural rubber, a synthetic resin or the like can be used.

The adhesive base may be a conventional pressure-sensitive adhesive which has been conventionally used. In particular, a natural rubber latex obtained by graft copolymerizing styrene and methyl methacrylate on natural rubber can be used. However, it is suitable in terms of blocking resistance, heat resistance, abrasion resistance and the like.

On the other hand, as the fine particles, those having a small affinity for the adhesive base, for example, zinc oxide, titanium oxide, calcium carbonate, kaolin, activated clay, spherical alumina, starch, silica, glass powder, shirasu balloon Are used. These materials may be used alone or in combination of two or more, but when two or more kinds having different particle diameters are combined, it is easy to form an adhesive-coated surface in an uneven shape.
The difference between the average size of the smaller and larger particles is 3
The difference should be at least 5 μm, preferably at least 5 μm, and the blocking prevention performance and the peeling performance are improved.

In particular, a material having excellent porosity such as silica or activated clay is set to 8 μm or less, and the smaller particles are used.
Addition of purified starch such as 16 μm wheat starch or constarch as a larger particle size to the adhesive base can strengthen the coating of the pressure-sensitive adhesive layer, and due to its porosity, the adhesive base adheres to the surface. This facilitates the adjustment of the adhesive force and the peeling force, and also has the advantage of improving the landing property of various printing agents and making them acceptable. Further, even when printing is performed by a printer using silicon oil, since the silicon oil is absorbed by the porosity, the adhesive is not stopped by the silicone oil. In addition, the average particle diameter of the fine particles is 10 μm
A range of 30 μm, preferably 1 μm to 20 μm, more preferably 2 μm to 15 μm is suitable.

The above-mentioned fine particles are blended and used in a proportion of 20 to 400 parts by weight with respect to 100 parts by weight of the adhesive base. After printing and printing predetermined information such as unique information and explanation items, the predetermined information P is exposed and folded as shown in FIG. Various postcards by bonding the ends,
When used as a notification card, a postcard or a notification card having concealment information on the joint surface, or as a seal, or as shown in FIG. When used in the same manner as above, the mixing ratio varies depending on the applied pressure,
In order to prevent the joint surfaces from easily peeling off under a pressure of kg / cm ² , 20 to 150 parts by weight, preferably 50 to 150 parts by weight, per 100 parts by weight of the adhesive base is used.
In order for the bonding surface to be peeled off as necessary and to allow the information on the bonding surface to be visible under the same pressure as that described above, 100 to 40 parts by weight of the adhesive is used.
0 parts by weight, preferably 130 to 300 parts by weight, of the pressure-sensitive adhesive is uniformly applied to the front and back of the sheet 1 in the range of 3 to 20 μm, and similarly, as shown in FIG.
As described above, in order to make one of the folds difficult to peel off and to peel off the other as required, 20 to 150 parts by weight for the back surface of the sheet 1 with respect to 100 parts by weight of the adhesive. 100 for the surface of sheet 1
The pressure-sensitive adhesives 2, 2 may be formed by applying the pressure-sensitive adhesives blended at a ratio of about 400 parts by weight.

As described above, the composition of the pressure-sensitive adhesive on the front and back surfaces of the sheet may be the same on the front and back surfaces, or may be different from each other. Even if it is increased, there is a possibility of peeling due to forcible force, and curling and wrinkling may occur. Therefore, the amount of coating may range from ^{2 to} 10 g / m ² (in terms of solid content) depending on the purpose of adhesion or peeling The amount of application between the surface of one side and the other side is 3
The application within the range of g / m ² is effective in preventing curling and wrinkles.

If the pressure-sensitive adhesive is applied over the entire surface of the sheet, it may be applied in the form of a screen with a dot of 60% or more.

The above-described pressure-sensitive adhesive print sheet has a surface on which a printing agent such as a printing ink or a toner ink is deposited by various printing methods such as letterpress printing, offset printing, silk screen printing, and electrostatic printer. The surface of the pressure-sensitive adhesive layer is coated by applying a pressure-sensitive adhesive to both sides of the base sheet 1 and then calendering, for example, in order to improve the receptivity and acceptability of the print sheet, and to obtain feedability as a print sheet. Is preferably moderately smoothed, and the smoothness at this time is set to 20 to 1 in accordance with JISP-8119.
The time may be set to 20 seconds, preferably 30 to 70 seconds.

Further, the pressure-sensitive adhesive print sheet 10 of the present invention comprises one print sheet 10 per unit,
This print sheet 10 is stacked in order to improve the peeling during feeding so that a large number of sheets are stacked, or each sheet is connected at a perforation, folded and stacked in a zigzag manner, and is suitable for being fed and used by a printer. peel strength comrades under a load of 1kg / cm ^2, 3 at room temperature
It is desirable that the thickness after immersion for 0 minutes is 25 g in width and 10 g or less.

Next, the present invention will be described in more detail with reference to examples of adjusting the pressure-sensitive adhesive, but the present invention is not limited to these examples.

[0021]

Preparation Example 1 Styrene 2 with 100 parts by weight of natural rubber
Parts by weight and a natural rubber latex obtained by graft copolymerizing 10 parts by weight of methyl methacrylate (MMA)
An adhesive base was prepared by adding 5 parts by weight of a terpene resin as a tackifier, and then 50 parts by weight of silica gel having an average particle size of 4 μm and wheat starch having an average particle size of 15 μm were added to 100 parts by weight of the adhesive base. 150 parts by weight were added to prepare a pressure-sensitive adhesive, which was then coated on a surface of 70 kg of high-quality paper using a wire bar at a coating amount of 4.5 g / g.
m ² , 6 g / m ² on the back side (all in terms of solid content), and then dried at 100 ° C. for 1 minute to prepare an A4 size pressure-sensitive adhesive print sheet.
Leave it indoors for a day, print on the front and back sides with Canon NP6650, and then fold 100 as shown in FIG.
A pressure of kg / cm ² is applied to perform bonding, and then 24
After leaving for a time, a peeling test was performed.

In the peel strength test, 10 pieces of 25 mm width were taken as bonded polymer pieces, one end thereof was fixed, and the other end was pulled so that the surfaces could be opened.
Peeling was performed at an average of 60 g at 0 to 80 g. As for the peel strength between the back sides, the tensile strength was measured so that the back sides could be opened in the same manner as described above.
Peeling was performed at 0 g.

Next, the same procedure as in Preparation Example 1 was carried out except that the surface in Preparation Example 1 was changed to 200 parts by weight of wheat starch.
5 g of peeling was performed.

[0024]

Preparation Example 2 The same procedure as in Preparation Example 1 was carried out except that the surface in Preparation Example 1 was changed to 20 parts by weight of silica and 100 parts by weight of wheat starch. As a result, between the back surfaces, peeling was performed at an average of 150 g at 135 to 160 g.

[0025]

Preparation Example 3 In addition, 20 parts by weight of silica, 60 parts by weight of wheat starch, and a coating amount of 4.0 were used for the back surface in Preparation Example 1.
Except having changed to g / m < ² >, it implemented similarly to the adjustment example 1.
As a result, the back side is 170-200g and average 180g
And peeling was performed.

In the above, a peeling test was carried out by hand with a postcard size, and as a result, the peeling strength was 100%.
g or less, preferably 80 g or less is easy to peel off,
As the weight exceeds 100 g, a peeling force must be carefully applied, and depending on the material of the sheet, it may be damaged. It has been found that 100 g or more, preferably 120 g or more, is convenient for use without peeling.

[0027]

As is clear from the above description,
According to the present invention, printing and printing can be performed on both sides of the print sheet, and the peel strength of the adhesive word between the front surface and the back surface is different. , Printing on either one side or both sides of the back side, it is possible to fold in one side of the front side, back side, or to fold in a Z-shape, or to overlap separate print sheets, so various notifications In addition to recording, the amount of pressure-sensitive adhesive applied to the front and back surfaces is 3
g / m ² , so that even under normal conditions such as temperature and humidity, the entire sheet expands and contracts uniformly, so that curling, wrinkling, etc. do not easily occur, and handling during storage becomes easy. In addition to being able to perform stable processing without being caught by the feed mechanism, even when feeding with
Since printing can be performed under the same conditions at desired locations on the front and back surfaces, the printing efficiency is significantly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pressure-sensitive adhesive print sheet according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which the pressure-sensitive adhesive print sheet is folded in use.

FIG. 3 is an explanatory view showing a state in which the pressure-sensitive adhesive print sheets are overlapped and used.

FIG. 4 is an explanatory diagram showing a three-fold use state of the pressure-sensitive adhesive print sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet 2, 3 Pressure-sensitive adhesive layer 10 Pressure-sensitive adhesive print sheet

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B42D 15/00

Claims (1)

(57) [Claims] A pressure-sensitive adhesive layer capable of receiving a printing agent is provided on substantially the entire front and back surfaces of a sheet.
The coating amount of the one surface and the other surface with each surface of the coating fee is 2 to 10 g / m ² is a difference in the range of 3 g / m ^2, one face each other and the other surface comrades A pressure-sensitive adhesive print sheet having different peel strengths after overlapping and pressure bonding.