JP4179856B2 - Pseudo adhesive sheet for printing - Google Patents

Description

【００５７】
表１から明らかなように、実施例１〜４の本発明の構成では、擬似接着シートの印刷用基材シートに打ち抜きダイカットした後も印刷・記録後、台紙用シートから印刷用基材シートを無理なく容易に剥離でき、さらに経時での剥離力上昇を抑え、安定した品質を保持できるとともに、台紙用シートから剥離した印刷用基材シートの印刷面とは裏面の筆記性に優れていた。
【００５８】
比較例１は、経時での剥離力上昇が顕著であり、剥がし難いばかりでなく印刷用基材シートがカールしてしまい、外観の悪いものであった。比較例２、３も同様に経時での剥離力上昇が顕著であり、比較例２では６５℃、８０％ＲＨ環境下で７日間保存した後、比較例３では２３℃、５０％ＲＨ環境下で１ヶ月保存した後、及び６５℃、８０％ＲＨ環境下で７日間保存した後に層間割れし、印刷用基材シートの裏面と台紙用シートとの間で剥離することができなかった。さらに、比較例４では製造直後から印刷用基材シートの裏面と台紙用シートとの間で剥離することができなかった。比較例５では、熱可塑性樹脂が台紙用シートと固着せず剥がれてしまい、印刷用基材シートを台紙用シートに固定できないばかりか、印刷用基材シート裏面と熱可塑性樹脂層との間で剥離するには手間がかかってしまった。比較例６では、剥離性、カールは良好であるが、印刷用基材シート裏面の筆記性がなかった。
【００５９】
【発明の効果】
本発明の印刷用擬似接着シートは、印刷用基材シートを打ち抜きダイカットした後の印刷・記録時の印刷用基材シートの剥がれを生じず、かつ印刷後には台紙用シートから印刷用基材シートを無理なく容易に剥離でき、さらに前記印刷用基材シートの経時での剥離力上昇を抑え、安定した品質を保持できるとともに、台紙用シートから剥離した印刷用基材シートの印刷面とは裏面に筆記性を有するため、簡易名刺、入場券、パーティー券、会員券、タグ、荷札、カード用として優れた印刷用擬似接着シートを提供することが可能となった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pseudo-adhesive sheet for printing. More specifically, the present invention relates to a pseudo-adhesive sheet for printing in which a base sheet is pseudo-bonded to a backing sheet in order to perform die-cutting, and more specifically, the base sheet (hereinafter referred to as a printing base) provided with a printing layer on the surface. A simple business card, admission ticket, party ticket, membership ticket, tag, and tag that are used after printing on the printed surface of the pseudo-adhesive sheet for printing that is pseudo-bonded to the backing sheet. The present invention relates to a pseudo-adhesive sheet for printing useful for cards and the like.
[0002]
[Prior art]
Conventionally, when manufacturing a large amount of business cards, admission tickets, party tickets, membership tickets, tags, packing tags, cards, etc., after printing within a predetermined frame of the printing sheet, and cutting to a prescribed size; A method of printing on a printing sheet that has been cut into a predetermined size in advance using a dedicated printing machine has been employed.
[0003]
However, in recent years, wholesale and retail stores sometimes display, manage, and use unique necessary information. For example, tags, tags, cards, etc. are common figures, barcodes, other patterns, characters, etc. Commercially available off-the-shelf products in which notation and information are printed in advance and unique necessary information is individually printed and recorded later.
[0004]
In addition, due to the recent information-oriented society, the penetration rate of personal computers and printers at home has been rapidly increasing, and the number of cases where consumers make their own simple prints for the final use form has increased. For example, business cards, admission tickets, party tickets, etc., may be produced individually by printing them on printing paper and cutting them with a cutter or scissors.
[0005]
Since the above products are handled in the form of individual sheets that are individually separated, when individually printing / recording unique necessary information later, first in supplying sheets to a dedicated printing machine or recording device. There is a problem that individual sheets need to be aligned manually or by a special alignment device. On the other hand, producing a sheet printed at home or the like by cutting with a cutter or scissors has a problem in that work efficiency is low and much labor is required.
[0006]
In order to solve the above-mentioned drawbacks, JP-A-6-328609 proposes a laminated sheet for printing small paper pieces capable of printing on small paper pieces without using a dedicated printing apparatus. The sheet is a laminated sheet formed by integrally laminating one or two or more thermoplastic resins as an intermediate layer between a printing substrate layer and a supporting substrate layer, The adhesive strength between the printing base material layer and the intermediate layer is smaller than the adhesive strength between the supporting base material layer and the intermediate layer and between the thermoplastic resins constituting the intermediate layer, and the peel strength In addition to being 0.5 to 200 g / cm, the printing base material layer is provided with a notch for contouring a small paper piece having a predetermined shape.
[0007]
In the configuration as described above, the thermoplastic resin is easily separated from the surface substrate by providing a thermoplastic resin between the surface substrate and the supporting substrate. It is melted at a lower temperature, extruded from a T-die of an extruder, and releasability is imparted by laminating and solidifying with a surface substrate, and the resin temperature at the time of extrusion is solidified with the surface substrate. This has a great influence on the peel strength from the thermoplastic resin.
[0008]
For this reason, for example, in order to reduce the peeling force, it is necessary to set the resin temperature lower than usual. In some cases, film cracking (a state in which the surface base material and the thermoplastic resin are not bonded) occurs. It was very difficult to obtain stable quality, such as happening or raising the resin temperature only a few degrees C., resulting in excessive peel strength. Moreover, when the thermoplastic resin provided between the surface base material and the support base material is a single layer, the peelability from the surface base material can be obtained, but the adhesiveness to the support base material becomes poor. There is a problem that the supporting substrate and the thermoplastic resin are not fixed and peeled off.
[0009]
Furthermore, when a paper base material made of pulp fibers is used, even if the target quality is obtained for the initial peel force, the peel force gradually increases with time. In some cases, the surface base material and the thermoplastic resin In some cases, the support base material or the surface base material may crack between layers.
[0010]
On the other hand, in Utility Model No. 2583272, the surface base material is fixed to the base substrate, and after the surface base material side is punched and die-cut, the tags on the surface base material side remain fixed to the base substrate. It is possible not to separate them separately, and when printing and recording individual required information individually, it is possible to supply sheets without needing a special alignment device or manual alignment when supplying sheets to a printing press or recording device. Then, after printing or recording, a laminated sheet for punching that can be used in the same manner as a conventional tag or the like by peeling the surface base material side from the base base material fixing surface without damaging it has been proposed.
[0011]
The laminate sheet for punching is integrally formed by laminating a peelable synthetic resin layer A and an adhesive synthetic resin layer B between a surface base material and a base substrate, and peeling from the surface base material or the base substrate. It is characterized in that it can be peeled off from the interface with the synthetic resin layer A, and when passing through a printing machine or recording device after punching die cutting, the surface base material is generally stuck and bonded to the base substrate. Able to print information and record unique information, exfoliate from the base substrate without breaking the surface substrate side, and the peeled surface substrate can be used in the same way as a general surface substrate, etc. It is.
[0012]
Since the laminate sheet for punching is provided with a peelable synthetic resin layer between the surface substrate and the base substrate, a stable peel force between the surface substrate and the synthetic resin layer can be obtained. . However, it is necessary to use a polyolefin resin containing a silicone resin in the synthetic resin layer, and the synthetic resin containing the silicone resin remains in a supply device or a T die when processed by the extrusion laminating method. There has been a problem that quality may be adversely affected, for example, the base material and synthetic resin of another product extruded and laminated with the same processing machine, or the adhesive strength between the synthetic resin and the synthetic resin is weakened.
[0013]
Further, in JP-A-7-134554, the mold release processing unit is provided by providing a mold release processing unit on one side corresponding to the thermoplastic resin of the process management unit provided with a frame of notches or perforations on the display substrate. Has been proposed that has been pseudo-adhered to the thermoplastic resin layer so that the process control part can be peeled off.
[0014]
However, the proposed logistics management sheet has a release treatment part on one side of the display substrate, and depending on the type of the release agent, the pseudo-adhesive force (hereinafter also simply referred to as peeling force) is too low. Therefore, the display substrate may be peeled off from the thermoplastic resin before use, or the thermoplastic resin layer needs to be extruded and laminated at a relatively low temperature in order to impart the peelability between the display substrate and the thermoplastic resin. For this reason, there is a case where the film is peeled off between the backing sheet provided for imparting strength and the thermoplastic resin layer. In particular, when a release agent containing silicone is used, there is a problem that writing cannot be performed with a pencil or a ballpoint pen.
[0015]
In JP-A-11-202771, in a pseudo-adhesive sheet using a surface base material of a sheet made of cellulose pulp as a main raw material, a resin solution or an aqueous emulsion resin is applied and dried on the back surface of the sheet to form a resin-treated surface, There is described a pseudo-adhesive sheet in which a thermoplastic resin layer is formed on the resin-treated surface by an extrusion laminating method so that they can be peeled apart.
[0016]
Since the resin-treated surface is formed in advance on the back surface in contact with the molten thermoplastic resin on the surface base material of the pseudo-adhesive sheet, the thermoplastic resin melted during the lamination process is between the pulp fibers of the surface base material. It is described that stable peeling can be obtained by preventing penetration into the gap, and the adhesive force can be controlled by changing the application amount of these resins. In this case, the publication discloses that an aqueous resin solution or an aqueous emulsion resin is preferable for the resin-treated surface, and each example shows the use of water-soluble polyvinyl alcohol, polyester resin, or styrene-acrylic resin emulsion. Has been. However, the above effects do not occur uniformly for all aqueous resin solutions and aqueous emulsions in terms of peel strength and changes with time, and a suitable material for the resin treatment surface is selected from a wide range of these resin materials. It is not always easy to select.
[0017]
[Problems to be solved by the invention]
The present invention provides a printing sheet in which a thermoplastic resin layer that forms a pseudo-adhesive surface is laminated between a printing base sheet mainly composed of pulp fibers and a mount sheet, which solves the drawbacks as described above. By specifying the physical properties of the material related to the formation of the pseudo-adhesive surface, the printing substrate sheet can be easily and easily removed from the backing sheet after printing / recording even after die-cutting the printing substrate sheet. To provide a pseudo-adhesive sheet for printing that can be peeled, further suppresses an increase in peeling force over time, maintains stable quality, and has a writing property on the back side of the printing surface of the substrate sheet for printing peeled from the backing sheet. Is an issue.
[0018]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the cause of the adhesion between the paper substrate mainly composed of pulp fibers and the mount sheet with the thermoplastic resin is oxidized by heating and melting. It has been found that the thermoplastic resin is bonded by a chemical reaction with the base material, and that the resin heated and melted into the voids of the base material is physically permeated. In other words, because it is bonded by chemical or physical action with a paper base material mainly composed of pulp fiber, in order to adjust the peel force, it depends on the fiber entanglement, fiber thickness, etc. Depending on the degree of void, it is necessary to change the melting temperature of the thermoplastic resin, or to adjust the nip pressure and processing speed when joining the paper base material and the thermoplastic resin. It becomes.
Therefore, in the present invention, in the pseudo-adhesive sheet for printing formed by laminating a printing pulp base sheet having a printing layer on the front surface so as to be peelable from the backing sheet through the coating layer on the back surface and the thermoplastic resin By forming these coating layers and thermoplastic resins that form a pseudo-adhesive surface with hydrophilic and hydrophobic materials having different interfacial chemical energies, the hydrophilic back surface and hydrophobicity of the substrate sheet for printing are exhibited. Peeling at the interface with the thermoplastic resin is easy, the peel force change with time is small, and a pseudo-adhesive sheet for printing having writing property on the back surface is found, and the present invention has been completed.
[0019]
  That is, the present invention relates to a printing base sheet mainly composed of pulp fibers having a printing layer on the front surface and a coating layer having hydrophilicity on the back surface, and a thermoplastic resin layer having a hydrophobic surface. And stacking sheets for the mountIn the pseudo-adhesive sheet for printing made to be peelable between the base sheet and the mount sheet, the hydrophobic thermoplastic resin is applied to the hydrophilic coating layer.The contact angle of the coating layer surface that exhibits hydrophilicity and is supplied at a melting temperature that allows peeling at the interface (contact angle measured 60 seconds after dropping a 50 μL water droplet at 23 ° C.) (θ1 ), The contact angle (θ2) of the surface of the thermoplastic resin layer that contacts the back surface of the printing substrate sheet, and the relationship between them is expressed by the following formula:
0 ≦ (θ1) ≦ 105 °
(Θ2)> 105 °
0 ≦ (θ1) / (θ2) <1
And a pseudo-adhesive sheet for printing, characterized in that the mount sheet has an anchor thermoplastic resin that is fixed to both layers between the surface and the thermoplastic resin layer ( Claim 1).
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The substrate sheet for printing of the present invention is not particularly limited as long as it has pulp fibers as a main component and a printing layer is provided on one side, for example, fine paper, kraft paper, cast paper, art paper, glassine paper, etc. One provided with an ink jet recording layer, a thermal recording layer, a thermal transfer recording layer, or the like can be used.
[0021]
  In the present inventionThe contact angle of the hydrophilic coating layer surface (contact angle measured 60 seconds after dropping 50 μL of water droplets at 23 ° C.) (θ1), in contact with the back surface of the substrate sheet for printing of the thermoplastic resin layer The coating layer and the thermoplastic resin are selected and set so that the contact angle (θ2) of the surface and the relationship between them are represented by the following equation:.
0 ≦ (θ1) ≦ 105 °
(Θ2)> 105 °
0 ≦ (θ1) / (θ2) <1
[0022]
When the contact angle (θ1) of the coating layer surface exceeds 105 ° or (θ1) / (θ2) is 1 or more with respect to the relationship between (θ1) and (θ2), the coating provided on the back surface of the printing substrate This is not preferable because the adhesion between the work layer and the thermoplastic resin layer is increased and it becomes difficult to peel off or it becomes difficult to stably maintain the peeling force over time. Further, when (θ1) exceeds 105 °, it is not preferable in that the writing property with a ballpoint pen, pencil, ink, or the like becomes poor. On the other hand, (θ2) is preferably larger than 105 °, and if (θ2) is 105 ° or less, the adhesiveness between the surface on which the printed layer is provided and the coating layer having hydrophilicity on the back surface is increased, and it is difficult to peel off. Or it becomes difficult to stably maintain the peeling force over time. In order to make (θ2)> 105 °, it is necessary to keep the resin temperature at a certain level. For example, if the resin temperature is extremely increased, the oxidation of the resin increases and a hydrophilic functional group mainly composed of a carbonyl group is generated. It becomes easy to become hydrophilic and may cause the adhesive defect.
[0023]
  In a preferred embodiment of the present invention, the fiber coating ratio of the hydrophilic coating layer is 50 to 100%, and the center line average roughness (Ra) is 0.2 to 3.5 μm.2).
  If the fiber coverage is less than 50%, the thermoplastic resin layer gradually permeates into the voids of the fiber, and the peeling force between the thermoplastic resin tends to increase with time, which is not preferable. Even after a long period (one year or more) from manufacture of the pseudo-adhesive sheet for printing of the present invention, punching die cutting, storage and sale to use by increasing the coverage ratio to more than 50%. It can be peeled off without problems. Here, the fiber coverage is obtained by image processing of a photograph taken at a magnification of 100 times with an optical microscope or an electron microscope, so that the voids formed by the entanglement of pulp fibers and the coating layer are lost. The ratio of the area of the part covered with the coating layer and having lost the voids to the entire area is shown.
[0024]
In the present invention, if the center line average roughness (Ra) of the hydrophilic coating layer exceeds 3.5 μm, it is difficult to suppress an increase in peeling force over time even if the fiber coverage is relatively high. Therefore, it is not preferable, and it is substantially difficult to make the thickness less than 0.2 μm when a coating layer is provided on a printing substrate mainly composed of pulp fibers.
[0025]
  In a preferred embodiment of the present invention, the material for forming the coating layer is preferably acrylic resin, styrene resin, nitrified cotton, polyamide nitrified cotton, chlorinated polyolefin resin, polyester resin, urethane resin, maleic acid resin, polyamide resin. , An ethylene-vinyl acetate copolymer, at least one resin selected from carboxy-modified styrene-butadiene rubber, or a resin containing at least one copolymer of these resins as a main component.3).
  As the resin, in order to make the coating layer hydrophilic, a carboxyl group, a sulfonic acid group, a primary amine group, a secondary amine group, a tertiary amine group, a hydroxyl group, an ether group, A resin into which a hydrophilic functional group such as an amide group is introduced may be used. In consideration of the fluidity and handling properties of these resins, the Tg (glass transition point) of the resins is preferably 250 ° K. or more.
[0026]
A pigment may be added to the coating layer in order to match the hue with the printing layer, to increase hydrophilicity, and to improve writing properties. Examples of the pigment include inorganic pigments such as titanium oxide, talc, kaolin, satin white, calcium sulfate, zinc oxide, carbon black, barium sulfate, calcium carbonate, aluminum hydroxide, and organic pigments such as azo (pigment name: Hansa Yellow, Naphthol Red, Disazo Yellow, Pyrazolone Orange, Chromothal Yellow, Watching Red, Carmine 6B, etc.), Phthalocyanine (Pigment Name: Phthalocyanine Blue, Phthalocyanine Green, etc.), Dioxazine (Dioxazine Violet, etc.), Quinacridone ( Quinacridone red, etc.), dyed lake systems (methyl violet lake, rhodamine lake, etc.), polypropylene, polyethylene, styrene, acrylic-styrene, urea-formalin, melamine-ho Marin, and the like can be exemplified benzoguanamine.
The particle size of the pigment is about 0.05 to 10 μm in consideration of being in a manufacturable range, and not easily deteriorating the appearance due to surface irregularities, so that it does not easily fall off the substrate.
[0027]
The coating layer containing the resin as a main component contains other additives such as a liquid defoaming agent, a lubricant, and a film forming aid for imparting coating properties, friction resistance, drying properties, and the like. May be. However, adding hydrophobic release agents such as silicone or its derivatives makes it impossible to write on the surface, or the peel strength between the back surface of the printing substrate sheet and the thermoplastic resin layer decreases. This is not preferable because it causes a problem such that the substrate sheet for printing peels off from the mount before printing.
[0028]
  In a preferred embodiment of the present invention, the coating layer containing the resin as a main component is coated with an ink containing at least one selected from flexographic ink, offset ink, and gravure ink containing the hydrophilic resin as a binder component. It is preferable that the product is obtained by drying (claims)4).
[0029]
As a result, the coating layer has excellent drying properties and excellent fiber coverage. In order to match the hue of the printing coating layer provided on the substrate sheet for printing, the ink can be appropriately used colored or colorless, and can be used by coating and drying one or more layers. it can.
[0030]
Examples of the coating apparatus for providing the coating layer include a bar coater, an air knife coater, a direct gravure coater, an offset gravure coater, and a multi-stage roll coater. When ink is applied to form a coating layer, printing coating may be performed by a printing method such as letter press, gravure, offset, or screen process. The printing method may be appropriately selected mainly depending on the type of ink. It is not limited to these.
[0031]
  In addition, when the said coating layer consists of at least 1 layer and consists of 2 layers or more, it is preferable to have a hydrophilic layer at least on the side facing the said thermoplastic resin layer.5). In order to suppress physical penetration of the thermoplastic resin layer into the pulp fiber and to obtain a more stable peelability between the thermoplastic resin layer and the backing sheet, the coating layer can be composed of two or more layers.
[0032]
The thermoplastic resin layer is not particularly limited as long as it can exhibit a pseudo-adhesion effect on the coating layer, and the surface of the thermoplastic resin becomes hydrophobic. Examples thereof include a polyolefin polymer or copolymer, a mixture of one or more thermoplastic resins such as polystyrene, vinyl acetate copolymer, ethylene-vinyl acetate copolymer, and polyester.
[0033]
The thermoplastic resin layer is provided between the printing substrate sheet and the mount sheet, thereby firmly bonding to the mount sheet, and on the other hand, the printing substrate sheet (the coating layer on the back surface thereof) The thickness is not particularly limited, but considering workability, cost, etc., it is about 5 to 30 μm.
[0034]
  In general, by providing a pseudo-adhesive thermoplastic resin between a surface base material (printing base sheet in the present invention) and a support base material (mounting sheet in the present invention), peeling from the surface base material is performed. In order to facilitate this, it is necessary to laminate at a relatively low resin temperature using the extrusion laminating method, which may reduce the adhesion to the support substrate. The thermoplastic resin for anchors is pre-laminated on the surface of the backing sheet as the supporting substrate that comes into contact with the thermoplastic resin, and is firmly bonded to the backing sheet through this.LetAs the anchor thermoplastic resin, it is preferable to use the same type of material as that of the thermoplastic resin layer in order to firmly bond the support substrate and the pseudo-adhesive thermoplastic resin layer.
[0035]
In the pseudo-adhesive sheet for printing according to the present invention, since the specific coating layer is provided on the back surface of the printing substrate, the resin temperature is relatively high as long as the printing substrate sheet and the mount can be peeled off. Although it is possible to set, depending on the type of resin and pigment forming the coating layer, there is a high permeability to the fiber, it may be necessary to laminate at a relatively low temperature, or It is preferable to provide a thermoplastic resin layer for anchors in order to suppress a change in peeling force over time.
[0036]
Examples of the method for providing the thermoplastic resin layer and the anchor thermoplastic resin include an extrusion laminating method, a hot melt laminating method, a dry laminating method, a solvent laminating method, and a wet laminating method. An extrusion laminating method that can be easily bonded to the substrate is suitable.
[0037]
  The printing coating layer of the base sheet provided with the printing coating layer on the surface is an initial peeling force (23a, 50% RH environment between the coating layer and the thermoplastic resin layer provided on the back surface (a ), And peeling force (b) after storage for 1 month in an environment of 23 ° C. and 50% RH, and peeling force (c) after storage for 7 days in an environment of 65 ° C. and 80% RH. 45 N / m is preferred.6). If it is less than 5 N / m, it may be peeled off between the coating layer and the thermoplastic resin layer on the back surface of the substrate sheet for printing before printing on the front surface, and printing may be performed with a printing machine. It is not preferable because it becomes impossible. On the other hand, if it exceeds 45 N / m, not only is it difficult to peel off, but the substrate sheet for printing after curling is curled, which deteriorates the appearance and reduces the utility value. This is not preferable.
[0038]
(Example)
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. In the examples and comparative examples, “parts” and “%” indicate “parts by mass” and “% by mass” unless otherwise specified. The measurement methods and evaluation criteria for each item in Table 1 showing the evaluation of effects in each example are as follows.
[0039]
<Evaluation items for effects>
[Contact angle]
5 μl of water was dropped on the surface of the coating layer and the surface of the thermoplastic resin layer provided on the back surface of the substrate sheet for printing, and the contact angle was measured after 60 seconds (measuring device: Kyowa Interface Science Co., Ltd.) CA-X type contact angle meter).
[0040]
[Fiber coverage]
The fiber coverage is a value obtained with a personal image processing analysis system (DA-5000, manufactured by Oji Scientific Instruments) by taking a photograph of the coating layer surface provided on the back surface of the printing substrate with an electron microscope at a magnification of 100 times. is there.
[0041]
[Peeling force and peelability]
The peeling force between the back surface of the printing base material sheet of the pseudo-adhesive sheet for printing and the thermoplastic resin layer was measured and judged according to the following criteria. The measurement method was such that a double-sided tape was affixed to the back surface of the backing sheet and adhered to the fixing device so that it would not be peeled off from the fixing device during the measurement, and the printing substrate sheet side was peeled off at a peeling rate of 0. It measured using the tensile tester so that it might peel at 180 degrees at 3 m / min. The peel force was 7a immediately after producing the pseudo-adhesive sheet for printing (a), after 1 month storage at 23 ° C. and 50% RH environment (b), and 7% under 65 ° C. and 80% RH environment. Measurements were made after (c) after storage for one day.
○: (a), (b), (c) has a peeling force of 5 to 45 N / m, and can be easily peeled off.
×: When corresponding to one of the following cases.
(Case 1) Although the peel force of (a) is in the range of 5 to 45 N / m, either of the peel forces of (b) or (c) exceeds 45 N / m, making it difficult to peel.
(Case 2) The peeling force of any of (a), (b), and (c) exceeds 45 N / m, making it difficult to peel.
XX: The base material cracks between layers when peeling off any one of (a), (b), and (c).
[0042]
[curl]
The curl curl of the sample whose peel force was measured as described above was evaluated as follows. In addition, the measuring method of curling curling is to leave the printing substrate sheet after peeling the back surface of the printing substrate sheet and the thermoplastic resin layer on a flat surface in an environment of 23 ° C. and 50% RH. The values at the four corners were measured, and the maximum value was taken as the measured value.
○: The maximum curling curl is 5 mm or less, which is good.
Δ: The maximum curl is 5 to 10 mm, and the appearance is slightly poor (practical use limit).
X: The maximum curl exceeds 10 mm, and there is a problem in practical use.
[0043]
[Writing]
The backing sheet of the pseudo-adhesive sheet for printing was peeled off, and the writing property with a ballpoint pen and a pencil (HB) on the back surface of the printing substrate sheet was evaluated as follows.
○: Excellent writing performance with a ballpoint pen or pencil.
X: The writing property of either a ballpoint pen or a pencil is inferior.
[0044]
Example 1
[Preparation of substrate sheet for printing]
250m / m²An ink jet coating layer (hereinafter also simply referred to as an IJ coating layer) is provided on one side of a high-quality paper (made by Oji Paper Co., Ltd.), and the IJ coating layer is an ink composed of a styrene-acrylic resin and a pigment on the back surface ( Product name PAC-FE, manufactured by T & K TOKA) is 8 g / m after drying with a flexographic printing machine.²The whole surface was coated and dried to obtain a printing substrate sheet.
[Preparation of mount sheet]
35m / m²One side of the label paper (made by Oji Paper Co., Ltd.), polyethylene resin (product name: Mirason 16P, manufactured by Mitsui Petrochemical Co., Ltd.) with T-die, extrusion lamination method, resin temperature 335 ° C, cooling roll and pressure roll The nip pressure of 5Kg / cm²The laminate sheet was pre-laminated so as to have a laminate thickness of 15 μm, and a sheet for mounting having a thermoplastic resin layer for anchors was obtained.
[Production of pseudo-adhesive sheet]
On the back surface of the substrate sheet for printing, polyethylene resin (manufactured by Tosoh Corporation, PT-203) is used at a resin temperature of 300 ° C., and the nip pressure between the cooling roll and the pressure roll is 2.5 kg / cm.²Set to, and apply by the extrusion laminating method from the T die so that the laminate thickness is 25 μm, and at the same time, the thermoplastic resin layer for the anchor of the mounting sheet is bonded with the cooling roll and the pressure roll part And the pseudoadhesion sheet which can peel between the coating layer of the back surface of the base material sheet for printing, and the thermoplastic resin layer which transfers to the mount sheet side was obtained.
[0045]
Example 2
The IJ coating layer has a coating amount of 6 g / m after drying ink (made by T & K TOKA, MP) made of nitrified cotton and pigment on the back side with a gravure printer.²A pseudo-adhesive sheet was obtained by the same material and manufacturing method as in Example 1 except that the coating layer was formed by coating and drying the entire surface.
[0046]
Example 3
The IJ coating layer is coated with a radical polymerization type UV ink (manufactured by T & K TOKA, indigo 500) on the back using a flexographic printing machine with a coating amount of 6 g / m.²A pseudo-adhesive sheet was obtained by the same material and production method as in Example 1 except that the coating layer was formed by coating and UV irradiation over the entire surface.
[0047]
Example 4
[Preparation of substrate sheet for printing]
250m / m²An ink jet coating layer (hereinafter also simply referred to as an IJ coating layer) is provided on one surface of a high-quality paper (made by Oji Paper Co., Ltd.), and the IJ coating layer is an ink made of an acrylic resin and a pigment on the back surface (product name: PAC-MP, manufactured by T & K TOKA) is 6 g / m after drying with a flexographic printing machine.²A coating layer is formed by coating and drying the entire surface so that the coating layer is further coated with a radical polymerization type UV ink (product name: UV VECTA) on the coating layer with the same flexographic printing machine at a coating amount of 3 g / m.²Then, the entire surface was coated and UV-irradiated to form a coating layer to obtain a printing substrate sheet.
[Preparation of mount sheet]
A mount sheet similar to that in Example 1 was used.
[Production of pseudo-adhesive sheet]
On the back surface of the printing substrate sheet, a polyethylene resin (PT-203, manufactured by Tosoh Corporation) has a resin temperature of 310 ° C., and a nip pressure between a cooling roll and a pressure roll is 3.0 kg / cm.²Set to, and apply by the extrusion laminating method from the T die so that the laminate thickness is 25 μm, and at the same time, the thermoplastic resin layer for the anchor of the mounting sheet is bonded with the cooling roll and the pressure roll part And the pseudoadhesion sheet which can be peeled between the coating layer of the back surface of the base material sheet for printing, and the thermoplastic resin layer for pseudoadhesion which transfers to the mount sheet side was obtained.
[0048]
Example 5
The IJ coating layer has an ethylene-vinyl acetate copolymer (EVA) (SUMIKAFLEX S752, manufactured by Sumitomo Chemical Co., Ltd., Tg: 288K) on the back surface, and the coating amount after drying is 4 g / m.²A pseudo-adhesive sheet was obtained by the same material and production method as in Example 1 except that a coating layer was formed by coating and drying the entire surface.
[0049]
Example 6
The IJ coating layer has a coating amount of 4 g / m after drying carboxy-modified styrene-butadiene rubber (XSBR) (manufactured by JSR, JSR0623A, Tg: 256K) by bar coating.²A pseudo-adhesive sheet was obtained by the same material and production method as in Example 1 except that a coating layer was formed by coating and drying the entire surface.
As shown in Table 1, each of the sheets of Examples 1 to 6 satisfied the constituent requirements of the present invention and exhibited good characteristics in all evaluation items.
[0050]
Comparative Example 1
[Preparation of substrate sheet for printing]
250m / m²An ink jet coating layer (hereinafter also simply referred to as an IJ coating layer) is provided on one surface of a high-quality paper (made by Oji Paper Co., Ltd.), and the IJ coating layer is an ink made of an acrylic resin and a pigment on the back surface (product name: PAC-MP, manufactured by T & K TOKA) is 7 g / m after drying with a flexographic printing machine.²The whole surface was coated and dried to form a coating layer to obtain a printing substrate sheet.
[Preparation of mount sheet]
A mount sheet similar to that in Example 1 was used.
[Production of pseudo-adhesive sheet]
On the back surface of the substrate sheet for printing, a polyethylene resin (manufactured by Tosoh Corporation, PT-203) has a resin temperature of 290 ° C., and a nip pressure between a cooling roll and a pressure roll is 2.5 kg / cm.²Set to, and apply by the extrusion laminating method from the T die so that the laminate thickness is 25 μm, and at the same time, the thermoplastic resin layer for the anchor of the mounting sheet is bonded with the cooling roll and the pressure roll part And the pseudoadhesion sheet which can be peeled between the coating layer of the back surface of the base material sheet for printing, and the thermoplastic resin layer for pseudoadhesion which transfers to the mount sheet side was obtained.
[0051]
Comparative Example 2
[Preparation of substrate sheet for printing]
The same substrate sheet for printing as in Example 1 was used.
[Preparation of mount sheet]
A mount sheet similar to that in Example 1 was used.
[Production of pseudo-adhesive sheet]
On the back surface of the substrate sheet for printing, a polyethylene resin (manufactured by Tosoh Corporation, PT-203) has a resin temperature of 320 ° C., and a nip pressure between a cooling roll and a pressure roll is 2.5 kg / cm.²Set to, and apply by the extrusion laminating method from the T die so that the laminate thickness is 25 μm, and at the same time, the thermoplastic resin layer for the anchor of the mounting sheet is bonded with the cooling roll and the pressure roll part And the pseudoadhesion sheet which can be peeled between the coating layer of the back surface of the base material sheet for printing, and the thermoplastic resin layer for pseudoadhesion which transfers to the mount sheet side was obtained.
[0052]
Comparative Example 3
[Preparation of substrate sheet for printing]
250m / m²A high-quality paper (manufactured by Oji Paper Co., Ltd.) provided with an inkjet coating layer (hereinafter also simply referred to as an IJ coating layer) on one side was used as it was without performing backside coating.
[Preparation of mount sheet]
A mount sheet similar to that in Example 1 was used.
[Production of pseudo-adhesive sheet]
On the back surface of the substrate sheet for printing, polyethylene resin (manufactured by Tosoh Corporation, PT-203) is used at a resin temperature of 300 ° C., and the nip pressure between the cooling roll and the pressure roll is 2.5 kg / cm.²Set to, and apply by the extrusion laminating method from the T die so that the laminate thickness is 25 μm, and at the same time, the thermoplastic resin layer for the anchor of the mounting sheet is bonded with the cooling roll and the pressure roll part And the pseudoadhesion sheet which can be peeled between the coating layer of the back surface of the base material sheet for printing, and the thermoplastic resin layer for pseudoadhesion which transfers to the mount sheet side was obtained.
[0053]
Comparative Example 4
[Preparation of substrate sheet for printing]
The same printing substrate sheet as in Comparative Example 1 was used.
[Preparation of mount sheet]
A label paper (manufactured by Oji Paper Co., Ltd.) with a surface area of 35 g / m 2 was used as it was.
[Production of pseudo-adhesive sheet]
On the back surface of the substrate sheet for printing, a polyethylene resin (PT-203, manufactured by Tosoh Corporation) has a resin temperature of 320 ° C., and a nip pressure between a cooling roll and a pressure roll is 3.0 kg / cm.²Set the sheet thickness to 20 μm using an extrusion laminating method from a T-die, and at the same time, use a cooling roll and a pressure roll section so that the backing sheet (label paper 35 g, manufactured by Oji Paper Co., Ltd.) is in contact with the pressure roll. Bonding was performed to obtain a pseudo adhesive sheet.
[0054]
Comparative Example 5
[Preparation of substrate sheet for printing]
The same printing substrate sheet as in Comparative Example 1 was used.
[Preparation of mount sheet]
35m / m²Label paper (manufactured by Oji Paper Co., Ltd.) was used as it was.
[Production of pseudo-adhesive sheet]
On the back surface of the substrate sheet for printing, a polyethylene resin (manufactured by Tosoh Corporation, PT-203) has a resin temperature of 264 ° C., and the nip pressure between the cooling roll and the pressure roll is 2.0 kg / cm.²The laminate sheet was applied by an extrusion laminating method to a thickness of 25 μm from a T die, and at the same time, the backing sheet was bonded by a cooling roll and a pressure roll part so as to be in contact with the pressure roll to obtain a pseudo adhesive sheet. .
[0055]
Comparative Example 6
[Preparation of substrate sheet for printing]
250m / m²An ink jet coating layer (hereinafter also simply referred to as an IJ coating layer) is provided on one side of a high-quality paper (made by Oji Paper Co., Ltd.), and the IJ coating layer is an ink mainly composed of chlorinated polypropylene and a pigment on the back surface. (T & K TOKA MTX-CP) 95 parts, silicone (Toray Dow Corning Silicone SD7220) 5 parts, platinum catalyst (Toray Dow Corning SRX212) 0.7 part mixed liquid after drying with a bar coater The coating amount of 6g / m²The whole surface was coated and dried to obtain a printing substrate sheet.
[Preparation of mount sheet]
A mount sheet similar to that in Example 1 was used.
[Production of pseudo-adhesive sheet]
On the back surface of the printing substrate sheet, a polyethylene resin (PT-203, manufactured by Tosoh Corporation) has a resin temperature of 310 ° C., and a nip pressure between a cooling roll and a pressure roll is 2.5 kg / cm.²Set to, and apply by the extrusion laminating method from the T die so that the laminate thickness is 25 μm, and at the same time, the thermoplastic resin layer for the anchor of the mounting sheet is bonded with the cooling roll and the pressure roll part And the pseudoadhesion sheet which can be peeled between the coating layer of the back surface of the base material sheet for printing, and the thermoplastic resin layer for pseudoadhesion which transfers to the mount sheet side was obtained.
[0056]
[Table 1]

[0057]
As is clear from Table 1, in the configurations of the present invention of Examples 1 to 4, the printing base sheet is printed from the backing sheet after printing and recording even after punching and die-cutting into the printing base sheet of the pseudo adhesive sheet. It can be easily and easily peeled, further suppresses an increase in peel strength over time, maintains stable quality, and has excellent writing properties on the back surface of the printing substrate sheet peeled from the backing sheet.
[0058]
In Comparative Example 1, the peel force increase with time was remarkable, and it was not only difficult to peel off, but also the printing substrate sheet was curled and the appearance was poor. Similarly, in Comparative Examples 2 and 3, the increase in peel strength over time was also remarkable. In Comparative Example 2, after storage for 7 days in an environment of 65 ° C. and 80% RH, in Comparative Example 3 in an environment of 23 ° C. and 50% RH. After being stored for 1 month and after being stored for 7 days in an environment of 65 ° C. and 80% RH, the layers were cracked and could not be separated between the back surface of the printing substrate sheet and the backing sheet. Furthermore, in Comparative Example 4, it was not possible to peel between the back surface of the printing substrate sheet and the mount sheet immediately after production. In Comparative Example 5, the thermoplastic resin does not adhere to the mount sheet and peels off, so that the printing substrate sheet cannot be fixed to the mount sheet, and between the printing substrate sheet back surface and the thermoplastic resin layer. It took time and effort to peel off. In Comparative Example 6, the peelability and curl were good, but there was no writing property on the back side of the printing substrate sheet.
[0059]
【The invention's effect】
The printing pseudo-adhesive sheet of the present invention does not cause peeling of the printing substrate sheet at the time of printing / recording after the printing substrate sheet is punched and die-cut, and after printing from the backing sheet to the printing substrate sheet Can be easily and easily peeled off, further suppresses an increase in peeling force over time of the printing substrate sheet, maintains stable quality, and is the reverse side of the printing surface of the printing substrate sheet peeled from the backing sheet Therefore, it is possible to provide a pseudo-adhesive sheet for printing that is excellent for simple business cards, admission tickets, party tickets, membership tickets, tags, packing tags, and cards.

Claims (6)

A substrate sheet for printing mainly composed of pulp fibers having a printing layer on the front surface and a coating layer showing hydrophilicity on the back surface, a thermoplastic resin layer having a hydrophobic surface and a backing sheet in order In the pseudo-adhesive sheet for printing that is laminated and made peelable between the base sheet and the mount sheet, the hydrophobic thermoplastic resin is applied to the hydrophilic coating layer. will be supplied at a melt temperature such that the releasable at their interface Te, (contact angle was measured 23 50 [mu] L of water droplet 60 sec after dropping at ° C.) the contact angle of the coating layer surface exhibits hydrophilicity ( θ1), the contact angle (θ2) of the surface of the thermoplastic resin layer that is in contact with the back surface of the printing substrate sheet, and the relationship between them is given by
0 ≦ (θ1) ≦ 105 °
(Θ2)> 105 °
0 ≦ (θ1) / (θ2) <1
A pseudo-adhesive sheet for printing, wherein the mount sheet has an anchor thermoplastic resin that is fixed to both layers between the surface and the thermoplastic resin layer.   The printing according to claim 1, wherein the hydrophilic coating layer has a fiber coverage of 50 to 100% and a center line average roughness (Ra) of 0.2 to 3.5 μm. Pseudo-adhesive sheet.   The hydrophilic coating layer is made of acrylic resin, styrene resin, nitrified cotton, polyamide nitrified cotton, chlorinated polyolefin resin, polyester resin, urethane resin, maleic resin, polyamide resin, ethylene-vinyl acetate copolymer and carboxy-modified styrene. 2. The pseudo-adhesive sheet for printing according to claim 1, comprising at least one resin selected from nvudadiene rubber or a resin containing at least one copolymer of these resins as a main component.   The pseudo-adhesive sheet for printing according to claim 1, wherein the coating layer is obtained by applying and drying an ink containing at least one selected from flexographic ink, offset ink, and gravure ink.   2. The pseudo-adhesive sheet for printing according to claim 1, wherein the coating layer is composed of at least one layer having a hydrophilic layer on a surface facing the thermoplastic resin layer.   23 ° C. of the coating layer and the thermoplastic resin layer showing the hydrophilicity of the printing base sheet mainly composed of pulp fibers provided with a printing layer on the front surface and a coating layer showing hydrophilicity on the back surface, Initial peel force (a) in a 50% RH environment (a), and peel force (b) after storage for 1 month in an environment of 23 ° C. and 50% RH, and further stored for 7 days in an environment of 80% RH at 65 ° C. 2. The pseudo-adhesive sheet for printing according to claim 1, wherein the peeling force (c) is 5 to 45 N / m.