JPH05318672A - Paper releasable laminated and production thereof - Google Patents

Abstract

PURPOSE:To provide a paper releasable laminate such that paper adhering to the laminate can be easily peeled even when a self-adhesive and a silicone resin are not used, and which can be handled as a single product of printing paper and usable as a name card, an advertisement standing label, a menu list or a postcard. CONSTITUTION:A laminate 1 is obtained by laminating a base material 2 and paper 4 to be printed using a propylene resin film 3 as an adhesive layer. The bonding strength of the paper 4 and the propylene resin film 3 is 2-100g/25mm width at 25 deg.C and the bonding strength of the base material 2 and the propylene resin film 3 is larger than that of the paper and the film 3. The unit pieces of the paper are demarcated from the parts whose peripheries become blanks of the paper by slit or perforation frames so that the printed unit pieces of the paper can be peeled from the laminate consisting of the base material 2 and the propylene resin film 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate from which a paper used for making a business card, a private postcard, a menu for a cafeteria, etc.

[0002]

2. Description of the Related Art A business card is printed at a print shop by using a sheet of paper cut to the size of the business card. In addition, for New Year's cards and postcards during the summer, customers request the printing office to print greetings. Recently, due to the development of word professor, the sender himself prints on postcards by word professor. Further, as a thing to be printed by a word processor, a slit frame is formed on a unit piece printed from the paper side of the laminated body in which a label paper having a pressure sensitive adhesive applied to the back surface of a release paper is stuck. Label for address (New Paper Processing Handbook; pages 920-926; November 15, 1980)
Days) are used. In business cards as well, it has been demanded that a word professor be able to print on paper according to their own preference.

[0003]

[Problems to be Solved by the Invention] Since the characters on business cards and greetings on postcards are printed / printed on the same unit piece, they are printed / printed on sheets supplied one by one by a word processor function. It is preferable to print a large number at the same time. However, in order to perform simultaneous printing on a unit sheet of paper, it is necessary for the unit pieces to be printed to be present in series on a single sheet of paper, as in the conventional label printing laminate. Even if the above structure is applied to printing paper for business cards and postcards, it cannot be used as business cards and postcards because the pressure sensitive adhesive is present on the back side of the paper.

An object of the present invention is to provide a laminate capable of peeling a paper unit piece from the laminate without using a pressure sensitive adhesive and a silicone resin coating agent for peeling, and a method for producing the laminate.

[0005]

A first aspect of the present invention is a laminate in which a base material and a paper to be printed or printed are laminated with a propylene resin film as an adhesive layer, and the paper and the propylene resin film. The adhesive strength with the adhesive layer is 2 at 25 ° C.
100 g / 25 mm width, the adhesive strength between the base material and the propylene-based resin film adhesive layer is larger than the adhesive strength between the paper and the adhesive layer, and the base material and the propylene-based resin film adhesive layer are laminated. The unit of paper provides a laminate in which the unit of paper is separated from the part of the paper having a margin by a slit or a perforated frame so that the unit of paper printed or printed from the object can be peeled off. ..

In the second aspect of the present invention, a propylene resin film is extruded from a T-die at 240 to 310 ° C., and one side of the film is subjected to ozone treatment while the film is still in a molten state. The coated surface is laminated with a base material whose surface is treated by corona discharge, and the paper is melt-laminated on one side of a propylene-based resin film which is not treated with ozone to form a base material / propylene-based resin film / paper laminate. Then, a unit piece to be printed or printed from the side of the paper of this laminate, or to the size of the paper of the printed or printed unit piece, a slit or perforated frame is formed to a depth reaching the propylene resin film. It is intended to provide a method for producing a laminate capable of peeling paper, which is characterized by being provided.

[0007]

The adhesive surface of the base material and the adhesive layer of the propylene-based resin film are treated by corona discharge treatment and ozone treatment to increase the adhesive strength, while the paper on which printing is to be done is laminated. Since the surface of the propylene resin film adhesive layer on the side is not surface-treated at all, the adhesive strength between the paper and the adhesive layer is 2 to 100 g / 25 m at 25 ° C.
The width is small and the paper can be easily peeled off with a finger.

The present invention will be described below with reference to the drawings. 1 is a perspective view of a laminate 1 of the present invention, in which 2 is a substrate, 3 is a propylene resin film adhesive layer, 4 is paper, 5
Is a slit, 6 is a unit piece of paper to be printed, 7 is a margin of paper, and 8 is printing. FIG. 2 is a cross-sectional view of the stack, and FIG. 3 is a cross-sectional view showing a state in which the printed paper unit piece 6 is peeled from the stack.

FIG. 4 is a plan view showing an apparatus for producing a laminated body. The propylene resin film 3 melt-extruded from the T-die 9 at 240 to 310.degree.
On the other hand, the base material 2 which has been surface-treated by 1 and supplied from the laminating feeding section 2'is subjected to corona discharge treatment by the corona discharge electrode 12, and is pressed by the guide rolls 13 and 14
You are led to 4 '.

The paper 4 supplied from the sand feeding section 4'is guided to the pressure-bonding rolls 14 and 14 'by the guide rolls 13', and while the propylene resin film is still in the molten state, the pressure-bonding rolls 14 and 14 'are used. The base material 2, the propylene-based resin film 3 and the paper 4 are sandwich-laminated to form a laminated body 10, which is guided by a guide roll 15 and wound around a paper tube 16 inserted into a winder.

The laminated body 10 wound around the paper tube is rewound and printed on the paper 4 side if necessary. Only the paper 4 is punched out to form slits or perforations 5 around the unit piece 6,
Then, the laminated body 10 is cut into a required size (A4, B4, A3, B5 plates, etc.) to produce a laminated body 1 as shown in FIG.

In the present invention, the ozone treatment is carried out in the air gap between the adhesive surfaces of the molten propylene resin film and the substrate. The ozone treatment is performed by directing a gas (air or the like) containing ozone from a nozzle or a slit-shaped outlet of the ozone treatment device 11 toward the surface of the molten propylene-based resin film or by attaching the molten film and the base material together. It is made by spraying toward the section.

The concentration of ozone in the sprayed gas is 1 g / m
^It is preferably ³ or more, more preferably 3 g / m ³ to 50.
g / m ³ . Further, the spraying amount is preferably 0.05 liter / min / cm or more, and more preferably 0.1 to 30 liter / min / cm or more with respect to the molten thin film. In this case, if the flow rate is extremely increased, the melted propylene-based resin film sways and the film thickness becomes uneven, which is not preferable.

Then, the molten film of propylene resin treated with ozone by the above-mentioned method is introduced to a pressure roll,
Using the treated surface as an adhesive surface, it is pressure-laminated on a base material that has also been corona-discharge treated and also guided to a pressure roll. The degree of corona discharge treatment of the base material is 10 watt · min / m ² or more,
Preferably 30 watt · min / m ² to 200 watt · min /
The amount is m ² .

The propylene resin film 3 melt-laminated as an adhesive layer between a propylene resin base material and paper is a homopolymer of propylene and 50 to 99.5% by weight of propylene and ethylene, butene-1, and hexene-1. , Heptene-1, octene-
Copolymer with 50 to 0.5% by weight of a mixture of one or more α-olefins such as 1,4-methylpentene-1 (either a random copolymer or a block copolymer) It is possible to use those obtained by graft-modifying these propylene-based resins with acrylic acid, maleic anhydride or the like. These may be used as a mixture with each other.

Among them, the melt flow rate (JIS K
-6760; 230 °, 2.16 kg load) is 0.5 to
It is preferably 50 g / 10 minutes. Further, in order to improve extrusion laminating processability (spreadability, neck-in, etc.), propylene-based resin can be mixed with rubbers such as ethylene-based resin and ethylene-propylene rubber in a proportion of 30% by weight or less,
Further, a range (0.1) which does not extremely change the adhesive strength of the antioxidant, the heat stabilizer, the ultraviolet absorber, the slip agent, the antistatic agent, the antifogging agent, the colorant, the filler, etc., to the substrate or paper.
In an amount of up to 3% by weight). The thickness of the film is 10 to 40 μm.

[0017] As the substrate used as the substrate base material 2, cellophane, oriented polypropylene, polyethylene terephthalate, oriented polystyrene, resin film or kraft paper such as polyvinyl chloride, high quality paper, glassine paper, parchment paper, rayon paper, Examples include paper such as coated paper and synthetic paper, and non-woven fabric.
The thickness of the base material is 10 to 300 μm. The surface of the base material that adheres to the propylene-based resin film is subjected to corona discharge treatment, ozone treatment, flame treatment, anchor coating agent treatment, etc. in order to obtain high adhesiveness. The adhesive strength between the substrate and the film is preferably 50 to 1,000 g / 25 mm width at 25 ° C.

Paper The printing or printing paper 4 used in the present invention is kraft paper, high-quality paper, glassine paper, parchment paper, rayon paper, coated paper, synthetic paper and the like. This paper may be a thermal recording paper or a thermal transfer image receiving paper having a heat sensitive layer or a thermal transfer image receiving layer on the surface. The thickness of the paper is 70 to 300 μm, and a thickness that is balanced with the base material is desirable to prevent curling.

The adhesive strength (measured at 25 ° C.) between the propylene resin film 3 and the paper 4 in the present invention is 2 to 100 g /
25mm width is essential, 100g / 25m
If the width exceeds m, the adhesive strength between the paper and the film will be too strong, and when the paper is peeled off into unit pieces, the printed paper itself will break between the paper,
This is because easy peelability cannot be obtained. Also, the adhesive strength is 2
When the width is extremely weaker than g / 25 mm width, the adhesive strength between the laminated paper 4 and the propylene-based resin film 3 becomes too weak, and wrinkles appear on the paper surface 4 during lamination, perforation or slitting, or printing and printing. It comes in and comes off.

In order to obtain a stable adhesive strength between the propylene resin and the paper, the adhesive surface between the propylene resin and the paper may be oxidized (corona discharge treatment, ozone treatment, etc.), if necessary.
May be given. In this case, it is necessary to adjust the degree of the oxidation treatment so that the adhesive strength between the paper 4 and the film 3 becomes weaker than the adhesive strength between the base material 2 and the film 3.

Slits or perforations In the present invention, a slit or perforation of a fixed shape is essential at the depth reaching the propylene-based resin film 3 from the paper 4 side, and printing or printing is performed on the paper surface of the laminated product. This is because the unit pieces 6 having a constant shape can be easily separated after the application. The slits or perforations may be not only linear but also curved, and are not particularly limited as long as they are provided with a desired shape of printing paper and can be separated from the printing paper.

[0022] The wall thickness of the multilayer laminate 1 100~500μm, preferably 15
It is 0 to 350 μm. Examples of the printing machine or printing machine for the laminated body include a typewriter, a word processor, a thermal printer, a laser printer, a gravure printing machine, an offset printing machine, a screen printing machine, and an electrostatic plotter machine.

[0023]

EXAMPLES The present invention will be described in more detail below with reference to examples. Example 1 A propylene homopolymer having a density of 0.90 g / cm ³ and an MFR of 20 g / 10 min [“Mitsubishi Polypro FL25T” (trade name) manufactured by Mitsubishi Yuka Co., Ltd .: melting point 164 ° C.] was used, and the caliber was 9
From the T-die attached to the 0 mm extruder, the resin temperature 260
At a temperature of 500 ° C., a width of 500 mm and a wall thickness of 15 μm, a film shape was extruded, and then air having an ozone concentration of 20 g / m ³ was passed through a nozzle having a width of 450 mm installed at a position 30 mm below the T-die toward one surface of the molten film to give 1500 One side of the melted film was ozone treated by spraying at a rate of 1 / h.

Then, a high-quality paper (basis weight: 78 g / m ² ) was paid out from the base material feeding part of the extrusion laminate, and a corona discharge treatment (40 watt · min / m ² ) was applied to one side of the base material. The surface treated with corona discharge and the surface treated with ozone of the molten film are used as adhesive surfaces and are guided to a pressure roll, and further heat transfer image receiving paper [fine paper (basis weight: 150 g
/ M ² ) coated with an image receiving layer on the surface thereof] so that the fine paper side faces the surface opposite to the ozone-treated surface of the molten film, and the three members are pressure-bonded and laminated with a pressure-bonding roll.
A laminate of thermal transfer image-receiving paper / propylene homopolymer / fine paper having a propylene homopolymer film as an adhesive layer was obtained.

Next, the obtained laminate was cut into A4 size, and six rectangular slits each having a width of 5 cm and a length of 10 cm were punched from the thermal transfer image receiving paper side to reach the propylene homopolymer film. Then, a laminate of the present invention was obtained. This laminated body was printed on a unit piece of the thermal transfer image receiving paper in the frame of the slit using a word processor to obtain the printed laminated body shown in FIG.

The adhesive strength between the thermal transfer image-receiving paper of the printed laminate and the propylene homopolymer film was measured (25 ° C., relative humidity 50%), 30 g / 25 mm.
The width is the adhesive strength between the substrate and the film, and the high-quality paper of the substrate was broken. This laminate was evaluated as described below.

Examples 2 to 6 and Comparative Examples 1 to 2 Thickness of propylene-based resin film, resin temperature of propylene-based resin, ozone treatment, corona discharge treatment of base material and base material and base material of thermal transfer image receiving paper A laminate was obtained in the same manner as in Example 1 except that the type of paper was changed as shown in Table 1. The evaluation results are shown in Table 1. In Comparative Example 2, the high quality paper side of the thermal transfer image receiving paper was also subjected to a corona discharge treatment of 40 w · min / m ² .

Example 7 Propylene / ethylene random copolymer having a density of 0.89 g / cm ³ and an MFR of 21 g / 10 (trade name "Mitsubishi Polypro FL25K" manufactured by Mitsubishi Petrochemical Co., Ltd., melting point about 14).
0 ° C.), and a polyisocyanate
5g / m of polyether polyol anchor coating agent
^A layered product was obtained in the same manner as in Example 1 except that the amount of ² was applied and ozone was sprayed between the applied surface and the propylene / ethylene random copolymer resin of the molten thin film to carry out pressure bonding lamination. The evaluation results are shown in Table 1. The anchor coating agent is
A 3.5 wt% ethyl acetate solution of "Citabond T-120" (trade name) manufactured by Nippon Soda Co., Ltd. was used.

Comparative Examples 3 to 5 Lamination was carried out in the same manner as in Example 1 except that low density polyethylene and ethylene / α-olefin copolymer were used in place of the propylene homopolymer and various changes were made as shown in Table 1. Got the body The evaluation results are shown in Table 1. The abbreviations in Table 1 are as follows. FL25T: Propylene homopolymer (melting point 164 ° C) FL25K: Ethylene / propylene random copolymer (melting point 140 ° C) LS35: Low density polyethylene (density is 0.918)
g / cm ³ , MFR is 14 g / 10 minutes) V213M: ethylene-vinyl acetate copolymer (density is
0.938 g / cm ³ , MFR 8 g / 10 min, vinyl acetate content 7 wt%) L40MX: ethylene / α-olefin copolymer (density 0.923 g / cm ³ , MFR 7.5 g / 10 min)

Evaluation method (* 1) Adhesive strength between substrate and film and paper and film. A test piece immediately after lamination having a width of 25 mm and a length of 100 mm was peeled by 50 mm in the length direction, and then was T-shaped peeled by a tensile tester manufactured by Shimadzu Corporation at a tensile speed of 300 mm / min in a 90 degree direction. ..

Quality Evaluation (* 2) Easy Peelability A piece of printing paper unit having a slit shape and a width of 5 cm and a length of 10 cm was peeled from an A4 size laminate by hand at 25 ° C. and 90 ° C. Judged by the content. Good: Good peeling strength. Or peeled between the substrate and the film. ×: Not peeled off (including peeling between sheets)

(* 3) Machinability After laminating a laminated product having a width of 500 mm and a winding length of 200 m on a 3-inch paper tube, visually observing the machinability such as the winding state and shape observation by unwinding the laminated product. evaluated. ○: Good winding and rewinding. ×: Wrinkles occurred during winding and rewinding.

(* 4) Printing suitability The printing performance was evaluated by printing on the receiving paper surface of the printing unit piece of the A4 size laminated product in which the slit shape was stamped with a word processor manufactured by Ricoh Co., Ltd. .. ◯: Good printing Δ: At the time of printing, the receiving paper (width 5 cm × length 10 cm) of the printing unit piece in which the slit shape was stamped was peeled from the laminated product. ×: Printing is not possible.

(* 5) Curl property after peeling of printing paper After the laminated body having the slit shape stamped therein is left in an oven at 90 ° C for 5 minutes, the receiving paper of the unit piece in the slit frame is peeled from the laminated body. Then, the curl of the unit piece after peeling was evaluated. ○: No curl. (0 to less than 1 mm) Δ: Some curling occurs. (1 to less than 4 mm) X ... Large curl. (4 mm or more)

[0035]

[Table 1]

[0036]

[Effect] The release laminate of the present invention can be manufactured without using a thermosetting silicone resin using an organic solvent or the like or a pressure sensitive adhesive.
It is possible to obtain a foam paper which can easily peel off the printed / printed paper.

[Brief description of drawings]

FIG. 1 is a perspective view of a laminated body on which the printing or the paper to be printed of the present invention can be peeled off.

FIG. 2 is a sectional view of a laminate of the present invention.

FIG. 3 is a cross-sectional view of a laminated body showing a state in which paper is peeled off.

FIG. 4 is a plan view of an apparatus for manufacturing a laminated body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 Base material 2'Laminated part 3 Propylene resin film 4 Paper 4'Sanded part 5 Slit 6 Unit piece 7 Paper margin part 8 Printing 9 Die 10 Laminated body 11 Ozone processor 12 Corona discharge electrode 13, 13 'Guide roll 14, 14' Crimping roll 15 Guide roll 16 Paper core of winder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location B32B 31/20 7141-4F // B29K 23:00 (72) Inventor Yoshinobu Nagaoka Toho, Yokkaichi, Mie Prefecture Town No. 1 Mitsubishi Petrochemical Co., Ltd. Yokkaichi Research Institute (72) Inventor Minori Hashimoto No. 1 Tohocho, Yokkaichi-shi, Mie Mitsubishi Petrochemical Co., Ltd. Yokkaichi Research Institute

Claims (2)

[Claims] 1. A laminate in which a base material and paper to be printed are laminated with a propylene resin film as an adhesive layer, and the adhesive strength between the paper and the propylene resin film adhesive layer is 2 at 25 ° C. ˜100 g / 25 mm width, the adhesive strength between the base material and the propylene-based resin film adhesive layer is larger than the adhesive strength between the paper and the adhesive layer, and the base material and the propylene-based resin film adhesive layer A laminated body in which the paper unit piece is separated from the paper portion having a margin by a slit or a perforated frame so that the paper unit piece printed from the laminate can be peeled off. 2. A propylene-based resin film having a thickness of 240 to 3
Extruded from a T-die at 10 ° C., while one side of the film was ozone-treated while the film was still in a molten state,
This ozone-treated surface is laminated with a substrate whose surface is corona-discharge treated, and one side of the propylene-based resin film that has not been treated with ozone is melt-laminated with the substrate / propylene-based resin film / paper. To obtain a stack of
Then, a slit or perforated frame is provided to the depth of the propylene-based resin film in the size of the unit piece to be printed or printed, or the size of the printed or printed unit piece from the paper side of this laminate. A method for producing a laminate capable of peeling paper, the method comprising: