JPH072414B2 - Method for producing waterproof recording material having ground pattern - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a waterproof recording material having a ground pattern, and more specifically, it is inexpensive and easy, and has various surface properties, that is, unevenness and wetting. Related to a method for producing a waterproof recording material that imparts visual effects such as three-dimensional patterns and perspective patterns by combining various levels of glossiness and tones (tones) Is.

[Conventional technology and problems]

Synthetic paper has been used as a waterproof recording material, but synthetic papers that have been used so far include, for example, roughened (sandblasted) PET film surface and synthetic resin film surface coated with inorganic substances. Prepared, a mixture of polypropylene resin and inorganic material was formed into a film and stretched, a synthetic resin film layer was provided on the paper, roughened, and the polypropylene resin was extruded on the paper using a mat roll. Laminated products are used.

However, in addition to the expensive resin, the number of steps is large, and the number of steps is large, and both are expensive. Further, although it is easy to process, it has the drawback that the workability is poor because it does not sufficiently satisfy the required characteristics as a recording paper and is easily charged.

On the other hand, embossing has been widely used as a method for imparting a ground pattern to synthetic paper using a synthetic resin film.
However, in embossing, the sheet material is preheated, and the pattern is engraved with a pattern roll to give an uneven pattern,
The method of cooling and winding is common. That is, two steps are required to manufacture a waterproof recording material having a ground pattern, and therefore the steps are complicated and the productivity is poor.

[Means for solving problems]

In view of such circumstances, the present invention provides a waterproof recording material having a ground pattern that solves the above problems and a method for manufacturing the same.

That is, the present invention, between the substrate and the pattern surface of the sheet having a pattern by printing, a resin composition in which a thermoplastic synthetic resin is mixed with a filler is extruded into a film, pressure-bonded, cooled, and then the sheet And a pattern of the sheet is transferred to the surface of the resin composition film layer, and the method for producing a waterproof recording material having a ground pattern is provided.

The ground pattern in the present invention includes from a strong glossy tone without unevenness to a matte (blurred) tone having unevenness, a pattern, a character, a character, a symbol or a sticker, which combines glossiness and color tones of various stages, Includes Japanese paper, leather, woven patterns, etc.

Further, the recording material according to the present invention may be directly written or printed, or may be coated with a desired chemical agent (for example, electrostatic recording, heat-sensitive, pressure-sensitive, sublimation transfer, etc.) according to the recording method. Yes, but applies in both cases.
For example, when writing and printing directly, the product value is increased by the beauty of the ground pattern, and the uses are posters, standing signs, stickers, catalogs, brochures, calendars, maps, picture books, guidebooks, golf scorecards, It can be widely used for medical examination cards, business cards, leaf documents, light packaging bags, labels, composite containers, shopping bags, envelopes, stationery, coasters, menus, book covers, securities, cards, in-mold sheets, etc.

Also, since this ground pattern cannot be copied by an electrostatic recording method or the like, it can be easily distinguished whether it is a base paper or a duplicate based on the presence or absence of the ground pattern, and it can be used as a base paper for distinguishing authenticity or for preventing alteration. it can.

When a recording paper is prepared by coating a chemical, the desired recording paper can be obtained by adjusting the wettability and fixing property of the chemical according to the background pattern.

Further, in order to further enhance the decorative effect, the film layer having a ground pattern may be colored or vapor-deposited.

Hereinafter, the present invention will be described in detail.

The thermoplastic resin in the present invention refers to a waterproof resin that can be laminated, and any resin can be selected depending on the required physical properties. Further, the resins may be different on the front and back. Particularly preferred are polyolefin resins and polyester resins. Examples of the polyolefin resin include polyethylene, polypropylene, poly-4-methylpentene-1, copolymers thereof, copolymers of these with other monomers, and mixtures thereof. As the polyester resin, polyethylene terephthalate,
Examples thereof include polybutylene terephthalate, those obtained by changing the types of acid components and / or glycol components of these monomers, and copolymers and mixtures thereof.

The filler in the present invention includes not only an inorganic substance but also an organic substance, and the shape of the filler such as a particle or a fiber is preferably applied.

The first purpose of blending the inorganic filler is to use the heat at the time of laminating to gasify the adhering water and crystallization water of the inorganic filler, and to utilize the pyrolysis gas of the inorganic filler itself to form voids. Let The voids are preferably open cells and closed cells, which are fine, and improve the coating property and fixing property of the drug layer to be post-processed, and particularly impart heat insulating property and cushioning property as a base material of heat-sensitive recording paper. Therefore, it is preferable. The second purpose is to impart hydrophilicity, improve the wettability of the film layer surface, and further improve printability and coating properties. The third purpose is to impart hydrophilicity to reduce the charging property and improve handling workability.
The fourth purpose is to make the film layer white and opaque to give a natural paper-like feel and to increase the contrast between the recorded image and the ground color. In particular, the purpose of blending the organic filler is to perform the above-mentioned void formation, but here, it is carried out by utilizing phase separation from the thermoplastic synthetic resin and decomposition gas of the organic filler. In addition, blending an organic filler rather than an inorganic filler has the advantage of reducing the weight because the specific gravity of the resin mixture becomes smaller.

As the inorganic filler used in the present invention, calcium carbonate, silica, mica, talc, clay, zeolite,
Alumina, magnesia, titanium oxide, tin oxide, glass powder, barium sulfate, bentonite, diatomaceous earth, gypsum, sodium hydrogencarbonate, etc. are exemplified, while organic fillers include urea resin, phenol resin, thermosetting polyester resin, silicone resin. Examples thereof include polystyrene resins, methylmethacrylate resins, and the like. These may be used alone or in combination of two or more depending on the purpose of use. The content of the filler is preferably in the range of 0.5 to 60% by weight. If it is less than 0.5% by weight, the void formation promoting effect is small, and if it exceeds 60% by weight, the laminating property is deteriorated. The blending amount is appropriately determined according to the laminating temperature, the amount of generated gas, and the like.

In the present invention, the use of a compatibilizer is a preferred embodiment. The compatibilizing agent used in the present invention is a thermoplastic synthetic resin that constitutes the resin composition, acts between the filler and the gas forming the voids, and is intended to make the voids formed uniform and fine. is there. What is desirable as a compatibilizer is, of course, an ordinary surface active agent, but in addition to a silicone type or a fluorine type surface active agent, for example, a polymer type propylene oxide, polystyrene sodium sulfonate, or a functional group-containing olefin resin (maleic anhydride). Polymer compounds such as acid copolymers, acrylic acid-based copolymers, itaconic acid copolymers, etc.), ethylene vinyl alcohol copolymers, and α-olefin adducts of polymethyl hydrogen siloxane can be used. The selection and blending amount of the compatibilizer are determined by the blending ratio of each component constituting the resin composition, the HLB value, and the like. Depending on the type of compatibilizer, it has an antistatic effect and a void forming ability by thermal decomposition. Mixing ratio is usually 0.1 to 15
A weight% range is preferred. If it is less than 0.1% by weight, the effect is not sufficient, and if it exceeds 15% by weight, the extrudability is adversely affected.

Next, in the present invention, by adding a water-absorbent resin in the resin composition, the hydrophilicity of the film layer is further improved, and the formation of voids by thermal decomposition is increased, and the wettability of the film layer surface is improved and It is effective in improving workability due to a decrease in chargeability.

As the water-absorbent resin used in the present invention, there are usually commercially available starch-based resins, acrylic acid-based resins and the like, which are determined by compatibility with the constituent components in the resin composition.

Further, in the present invention, generally used additives such as antistatic agents and antioxidants may be added to the resin mixture.

As the substrate in the present invention, pulp paper, coated paper, size press processed paper, super calendar processed paper, synthetic paper,
In addition to non-woven fabrics, laminated papers, etc., synthetic resin films, metal foils, metal vapor deposition films, and laminates of these are included.
The selection of the base material is determined by the purpose and application to be used.
For example, when high smoothness of recording paper for sublimation transfer is required, it is natural to reduce the unevenness of the ground pattern, but the base material is also coated paper with good smoothness, size press paper, calendar processing. Paper, synthetic resin film and the like are suitable.

The waterproof recording paper having a ground pattern according to the present invention is obtained by an extrusion method, which facilitates the production of the waterproof recording paper and the formation of the ground pattern, which is very advantageous.

That is, a resin composition obtained by mixing a thermoplastic synthetic resin with a filler is extruded into a film shape between a base material and a sheet having a printed pattern (hereinafter, referred to as a master sheet), and pressure-bonded,
After cooling, the master sheet is peeled and separated to transfer the pattern of the master sheet onto the surface of the resin composition film layer. This is a so-called extrusion laminating sandwich laminating method. In this case, the resin composition and the matrix sheet must be a combination that is released from each other. When a polyethylene resin or a polypropylene resin is used as the thermoplastic synthetic resin which is the main component of the resin composition, for example, a polyester resin or poly-4-methylpentene-1 is used as the mother sheet resin. Resin, vinyl chloride resin and the like are suitable. The pattern obtained by printing is an appropriate combination of the amount and color of ink (in addition to pigments, etc., metal powder, ceramic powder, metal oxide, etc., powdered or granular materials that can be used for printing) (that is, their particle size, shape, and dispersion). The degree of glossiness and tone are changed by various known methods by a known printing method.

The characteristic of this manufacturing method is that it is possible to express in a wide range from macro and dynamic stereoscopic effect, perspective to micro and delicate stereoscopic effect, perspective. In terms of processing, it is a manufacturing method suitable for high-mix low-volume production in which a desired ground pattern can be easily and quickly changed by simply replacing a sheet having a print pattern.

The ground pattern according to the present invention can be optionally provided on one side or both sides of the substrate according to the purpose.

With the conventional embossing method, the ground pattern is visible up to the back side,
In the case of the present invention, since the base material is interposed, there is a great feature in that the ground pattern does not show through, and therefore it is possible to provide the ground pattern on both sides. In the case of both sides, the front and back sides can have different ground patterns.

The ground pattern according to the present invention is intended to control the visual effect and the surface performance as a recording material as described above, and particularly to improve the surface wettability, the coating property, the coating fixing property and the like among the surface properties. Can apply corona discharge treatment to the ground pattern surface.

〔Example〕

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1 Polypropylene resin "LA-22" as a thermoplastic synthetic resin
1 "(Mitsui Petrochemical Industry) 70% by weight and calcium carbonate" Whiten SB (red) "30% by weight as a filler are dry blended to form a twin-screw kneader" PC ".
M-30 ”(made by Ikegai Tekko Co., Ltd.) melt kneading (die exit temperature 2
20 ° C.) and pelletized.

The pelletized resin composition is dried and supplied to a T-die extruder (diameter 40 mm, T-die temperature 290 ° C.) (1) as shown in FIG. m ² ) (4) was extrusion laminated (thickness 30 μm, cooling mirror roll (3) used). At this time, it was arranged along the cooling mirror roll (3) so that the surface printed with the walnut wood pattern was in contact with the resin composition (5).
A μm polyester printing sheet (matrix sheet) (6) is sandwiched by the resin composition (5) in the center (generally called polysand) and pressed by a press roll (2) (pressure 12 kg / cm ² ). After cooling with a cooling mirror roll (3), the obtained laminated product (printing sheet / resin composition / fine paper) (7) was wound up as a unit with a winding machine (8).

Water resistance having a ground pattern in which the target ground pattern is accurately transferred to the surface of the resin composition (5) by peeling the printing sheet (6) from the resin composition surface of the wound laminate (7) A recording material was obtained.

Corona discharge treatment (30 W / m ² / min) is applied to the ground pattern surface of the waterproof recording material having the ground pattern obtained as described above,
After setting the surface wetting index to 50 dynes / cm (by a wet finger drug), a printing test was performed by offset printing. As a result, the print ink fixability was good, and a printed matter having a background pattern was obtained.

Furthermore, when this printed matter was copied by an electrostatic recording method (Xerox copy), the ground pattern could not be copied, and only the printed content was copied.

Example 2 76% by weight of a polyethylene resin “M-14” (manufactured by Mitsui Petrochemical Industry Co., Ltd.) and calcium carbonate “Whiten SB” were provided on the non-laminated opposite surface of the laminated product obtained in Example 1.
(Red) 24% by weight of the resin composition is put into a T-die extruder (9) as shown in FIG.
Die temperature 330 ° C, thickness 30μm, use cooling mirror roll)
did. At the same time, corona discharge treatment was applied to the ground pattern laminate surface at the same time. When the treated ground pattern surface was coated with a heat-sensitive agent and dried, the heat-sensitive agent was found to have good adhesion and color development performance, as well as good writability and waterproofness.

[Action / effect]

As described above, according to the present invention, there is provided a waterproof recording material having a ground pattern, which is inexpensive and easily imparts various surface properties and visual effects depending on the ground pattern, and has waterproofness. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the apparatus used in Example 1, and FIG. 2 is a schematic diagram showing the apparatus used in Example 2. 1, 9 …… Extrusion laminating machine 2, 10 …… Press roll 3 …… Cooling roll 4, 12 …… Base material 5, 13 …… Resin composition (melt film) 6 …… Mother sheet 7 …… Laminate Product (patterned sheet / resin composition / base material) 8, 15 …… Winder 11 …… Cooling roll 14 …… Laminated product (resin composition / base material / resin composition)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Tokuno 4-13-18 Andachi, Suminoe-ku, Osaka-shi, Osaka Within Goyo Paper Co., Ltd. No. 13/18 Goyo Paper Co., Ltd. (56) Reference JP-A 63-5986 (JP, A) JP-A 61-141585 (JP, A) JP-A 63-186231 (JP, A) JP 58-162346 (JP, A)

Claims (4)

[Claims] 1. A resin composition obtained by mixing a thermoplastic synthetic resin with a filler is extruded into a film form between a base material and a pattern surface of a sheet having a pattern formed by printing, press-bonded, and cooled. A method for producing a waterproof recording material having a ground pattern, which comprises peeling and separating and transferring the pattern of the sheet onto the surface of the resin composition film layer. 2. The method according to claim 1, wherein the thermoplastic synthetic resin is a polyolefin resin. 3. The method according to claim 1, wherein the thermoplastic synthetic resin is a polyester resin. 4. The method according to claim 1, wherein the base material is paper.