JP2015217596A - Method for printing on core sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for printing on a core sheet in a manufacturing process of a card, which causes no detachment of ink during punching.SOLUTION: A monolayer card core sheet is subjected to multi-imposition to form a transparent off-set anchor layer printed on the front and rear faces of the card, a pattern layer by off-set and/or silk screen printing, and a transparent off-set overprint layer by printing in this order, and then subjected to punching to form pieces of unit cards without lamination of an over sheet on the front and rear faces of the core sheet. The method for printing on the core sheet includes off-set printing the pattern on the front or rear face of the card at least in the region in contact with a punching blade in punching. The printed pattern has a halftone dot area ratio in the range of 10 to 30%. The core sheet may include a laser coloring layer.

Description

The present invention relates to a printing method having punching resistance to a core sheet of a card.
For details, when a card is printed on the front or back of the card by offset printing or silkscreen printing, when the card is punched from a large sheet into an individual card, the pattern ink layer is peeled off by a punching blade. The present invention relates to a printing method for a core sheet that does not occur.

In recent years, cards for general-purpose use have been used in which pattern printing is performed on a single-layer core sheet by offset printing (or using silk screen printing in combination), and the pattern is protected by offset transparent overprint printing. .
In addition, a core sheet having a laser coloring layer on the front and back sides of a white card substrate has been used. In this case, the card is usually protected by printing a pattern on the surface of the laser coloring layer and printing an offset transparent overprint on the outermost surface.
Printing is also performed on the back side of the card with the same specifications. These cards have a feature that a transparent oversheet is not laminated on the front and back surfaces as in the conventional product. Therefore, the hot press process of laminating the core sheet and the oversheet is not performed.

Like conventional cards, these cards are printed using a large-sized core sheet with about 30 sides, so when making each individual card, a process of punching the core sheet using a metal punching blade Is required.
This card is a so-called direct-printed card, and only protects the pattern ink layer of the core sheet with thin overprint printing. Therefore, when punching, the ink layer is taken on the metal punching blade, Causes a problem of peeling (dropping). The peeling of the ink piece is noticeable on the back side when the card is punched from the front side, but the front side does not necessarily peel off at all. Unlike conventional cards, in addition to the absence of oversheets, the card is manufactured without thermal history by not performing the hot-press lamination and pattern transfer process of the oversheet, resulting in a decrease in ink adhesion. It is thought that this is also having an effect.
Card removal is performed for each sheet. However, there is a problem that the peeled ink piece moves to the extraction blade and adheres to the side surface of the next card from the extraction blade and becomes dirty. The adhering ink piece can be removed by wiping with a cloth or air blow, but it takes time and increases lead time and yield.

Therefore, the present invention provides a method for printing a core sheet in which a pattern ink layer does not peel off when a card of this kind is punched out.
Prior art documents related to the present application cannot be detected, but there is Patent Document 1 as a document related to offset printing of a card.

JP2012-123646A

Provided is a core sheet printing method in which a pattern ink layer on the front and back surfaces of a card does not peel off due to contact with a punching blade in card manufacturing processes, particularly when punching from a large-sized core sheet to an individual card size. .

The first of the gist of the present invention is that a single-layer card core sheet is multi-faced, and the card front and back side printing is performed on a transparent offset anchor layer, an offset and / or silkscreen printing pattern layer, and a transparent offset overprint layer. After printing in order, in the card manufacturing method in which the oversheet is not laminated on the front and back surfaces of the core sheet and manufactured by punching into each card of the unit, at least the part that contacts the punching blade to be punched A core sheet characterized in that the pattern printed surface on the front or back side of the card is offset printing, and the pattern is configured such that the area ratio occupied by the halftone dot portion by the printing is in the range of 10 to 30% In the printing method.

The second aspect of the present invention is that a single-layer card core sheet having a laser coloring layer on the front surface or the back surface is multi-faced, and the front and back surfaces of the card are printed by a transparent offset anchor layer, offset and / or silk screen printing. In the card manufacturing method, after printing in the order of the pattern layer and the transparent offset overprint layer, in a state where the oversheet is not laminated on the front and back surfaces of the core sheet, the card is manufactured by punching into a card for each unit. The pattern printed surface on the front or back side of the card that is in contact with the punching blade to be punched is offset printing, and the area ratio occupied by the halftone dot portion by the printing is in the range of 10 to 30%. It is in the printing method of the core sheet characterized by comprising.

When printing the core sheet by the above printing method, the ink of the pattern part is hardly peeled off when punching out one card per unit from a multi-faced large sheet. Can be manufactured. Moreover, the man-hour in card manufacture can be reduced.

It is a figure which shows the cross section of the card | curd after completion. It is a figure which shows the cross section of the other card | curd after completion. It is a surface view which shows the printed large format core sheet. It is a back view which shows the printed large format core sheet. It is a figure which shows the state which punches a card | curd from a large format core sheet.

FIG. 1 is a view showing a cross section of a card after completion.
The card 1 is printed on the front and back surfaces of a single-layer core sheet 100.
The core sheet 100 is usually made of a flat white plastic resin sheet. As the material, vinyl chloride, amorphous aromatic polyester, polyethylene terephthalate (PET), polycarbonate and the like are generally used, but are not particularly limited. In the resin of the core sheet 100, a white pigment such as titanium oxide (TiO ₂ ) is blended.
The thickness of the card 1 is based on satisfying 0.76 ± 0.08 mm, which is a standard value that defines the physical characteristics of the card (JISX6301), but is not particularly limited.

An offset anchor layer 201 is first printed on the surface 100u of the core sheet 100, and a pattern layer 202 by offset printing and / or silk screen printing is provided thereon, and a transparent offset overprint layer 203 is printed on the outermost surface. .
The same applies to the back surface 100d side of the core sheet 100. A transparent offset anchor layer 301 is printed, and a pattern layer 302 by offset printing or silk screen printing is provided thereon, and a transparent offset overprint layer 303 is printed on the outermost surface. The
In the conventional card, oversheets are laminated on the front and back surfaces of the card, but this card has a feature that the oversheet is not used.

FIG. 2 also shows a cross section of the card after completion, in which different types of core sheets are used.
In this case, the core sheet 100 has laser coloring layers 102 and 103 on the outer surface of the support layer 101. In the case of FIG. 2, the laser coloring layers are provided on the front and back sides, but only the coloring layer 102 on the front side or the coloring layer 103 on the back side may be provided.
The printing on the laser coloring layers 102 and 103 is the same as in FIG. 1, and the surface of the laser coloring layer 102 on the surface side is offset anchor layer 201, the image layer 202 by offset printing and / or silk screen printing, and the outermost surface. The transparent offset overprint layer 203 is printed in order. The same applies to the back side of the core sheet. On the surface of the laser coloring layer 103, an offset anchor layer 301, a pattern layer 302 by offset printing or silk screen printing, and a transparent offset overprint layer 303 are printed in this order.

Although the core sheet 100 of FIG. 2 is not limited, a polymer alloy resin of a polycarbonate resin and an amorphous aromatic polyester resin (PET-G resin) is used for the laser coloring layers 102 and 103 on the front and back sides. The support layer 101 is made of a non-crystalline aromatic polyester resin (PET-G resin), and a material obtained by co-extruding these three layers. Since a plurality of sheets formed into a sheet is not laminated and used, the sheet is formed by one extrusion molding. Therefore, even if the layer structure is three layers, it is generally called a single layer core sheet.

The support layer 101 is mixed with a white pigment such as titanium oxide (TiO ₂ ) to generate white reflected light. The laser coloring layers 102 and 103 inherently have a protective function, and are made visible light transmissive before laser beam irradiation. Therefore, it does not contain white pigments or colored colorants. Needless to say, even after the laser beam irradiation, the portions other than the printed portion that develops a black color are transparent. Here, “visible light transparency” refers to transparency that allows a layer disposed on the back surface of the layer to be visually recognized.
In the laser coloring layers 102 and 103, a coloring agent is dispersed. However, it is preferable that the difference between the refractive index of the resin forming the coloring layer and the refractive index of the coloring agent to be mixed is small. By reducing the value, the visible light transmittance of the laser coloring layers 102 and 103 can be enhanced.

Examples of the color former include various metals and metal compounds that form black metal oxides by heat generated by a laser beam, and thermoresponsive dyes that blacken. The coloring layer may contain a light absorber that absorbs the wavelength of the laser beam. When such a coloring layer is irradiated with a laser beam, the surrounding binder resin such as a light absorber is carbonized, and the carbonized portion exhibits a black color.
Alternatively, a color former such as a metal oxide and a light absorber may be used in combination. Thus, what is necessary is just to satisfy | fill the objective, and the material in particular is not limited in this invention.

The support layer 101 and the laser coloring layers 102 and 103 may be made of substantially the same resin composition material. The support layer 101 and the laser coloring layers 102 and 103 can be formed from a resin composition mainly composed of a polymer alloy of a polycarbonate resin and a substantially non-crystalline aromatic polyester resin. By using such a resin composition, the heat resistance of the card can be improved, and the color development layer can be prevented from expanding or deforming even when irradiated with a laser beam.

In the present invention, the polycarbonate resin means a resin composition whose main component is polycarbonate. Polycarbonate resins include those produced from bisphenol A synthesized from bisphenol and acetone by interfacial polymerization, transesterification, pyridine, etc., bisphenol A and dicarboxylic acid derivatives such as tele (iso) phthalic acid dichloride, etc. Polyester carbonate obtained by copolymerization with bisphenol A, derivatives of bisphenol A, such as those obtained by polymerization of tetramethylbisphenol A and the like.

In the present invention, the substantially non-crystalline aromatic polyester-based resin refers to a dehydration condensate of a component such as an aromatic dicarboxylic acid and a diol component. Among them, the crystallinity is low, and it is frequently used in practice such as press fusion. This means that even if the thermal processing is performed, the white turbidity and poor fusion due to crystallization are not caused. In addition, in this invention, PBT (polybutylene terephthalate) etc. are contained in what resembles an amorphous aromatic polyester-type resin, for example.

In order to obtain a predetermined card thickness by the support layer 101 and the front and back laser coloring layers 102 and 103, the total thickness of the card substrate 100 is set to about 0.8 mm, and the laser coloring layer 102 on one side is arranged. The thickness is set to 65 μm ± 10 μm. Accordingly, when the color developing layers are provided on both the front and back surfaces, the central support layer 101 is 670 μm ± 20 μm.

FIG. 3 is a surface view showing a printed large core sheet. This is common to the substrates of FIGS. The same applies to FIG. 4 below.
Since it is a large-sized core sheet with many faces of about 30 faces, the main parts are shown and most of them are omitted.
On the surface 100u side of the core sheet 100, a transparent offset anchor layer 201 is first printed on the entire surface, and a pattern 3 by offset and / or silk screen printing is provided thereon, and a transparent offset overprint layer 203 is formed on the outermost surface. It is printed.
Since the anchor layer 201 and the overprint layer 203 are transparent, only the pattern 3 of the pattern layer 202 is visible. The pattern 3 varies depending on the type of the card. The pattern 3 may be a design pattern, may be only the characters of the issuing company name, or may be printed in a single color full-color (uniform full-surface printing).

The pattern 3 on the front side is often a card name or a decorative design. In many cases, a mark (register mark) 8 serving as a mark for punching is also printed with offset ink. Since the register mark 8 is printed outside the area to be a card, the register mark 8 is not related to the picture 3 described above.
The rectangular punching line k by the chain line only indicates the position to be punched, and does not indicate the printed shape. The size of the completed card is 53.92 to 54.03 mm on the short side and 85.47 to 85.72 mm on the long side based on ISO (ISO 7810) or JIS (JIS X6301).

FIG. 4 is a back view showing the printed large core sheet.
As in FIG. 3, only the main part is shown. The offset anchor layer 201, the pattern layer 302 by offset and / or silk screen printing, and the transparent offset overprint layer 303 are also printed in order on the entire back surface 100d side of the core sheet 100.
Conventionally, the back pattern layer 302 is generally printed on the entire surface by offset printing, and printed with black fine characters or patterns 5 by offset printing in many cases. Mainly printing precautions.
The thickness of the printing layer is about 0.1 to 1.0 μm in offset printing. A rectangular punching line k by a chain line indicates only a punched position as in FIG. 3 and is not a printed shape. The configuration of these print layers is normal and is not particularly characteristic.

A feature of the present invention is that the pattern printing of the punching line k indicated by the rectangular punching line k is performed under certain conditions instead of the conventional solid printing. That is, the portion indicated by the punching line k is a portion where the punching blade contacts, but the pattern printed surface on the front surface or the back surface of the card, which is the portion where the punching blade contacts, is set as offset printing. The halftone dot printing unit 4 is characterized in that the area ratio occupied by the dot portions is in the range of 10 to 30%. The upper limit is set to 30% because if it exceeds 30%, ink peeling by the punching blade may be conspicuous.

The area ratio occupied by the halftone dot portion refers to the ratio of the portion to which the design ink adheres in the unit area (1 cm ² ) when the printing portion is enlarged and observed. In other words, the ratio of the portion excluding the white core sheet portion to which no ink is attached is assumed. The area ratio can be measured by observing the printed surface with a magnifying glass.
However, inks for offset anchor layers and overprint layers are not covered. This is because it is transparent and does not affect the dirt on the card.

The lower limit is set to 10% because the outline portion of the card is often made in a single color, and if it is less than 10%, it becomes close to the white color of the core sheet, making it difficult to match the colors in a single color. In card printing, it is often printed with special color inks toned to a specific color, compared to printing with yellow, magenta, cyan, and black process inks, as in publishing printing, but less than 10% Even if special color ink is used, it becomes difficult to reproduce the desired color.
Accordingly, the area ratio occupied by the halftone dot portion in the halftone dot printing unit 4 for monochrome offset printing is also targeted in the range of 10 to 30%.
In the case of offset printing, the area ratio occupied by the halftone dot portion on the printing surface is almost linearly proportional to the halftone dot area ratio on the original plate (not the printing plate, but the photographic original plate). If the halftone dot area ratio is set in this range, the area ratio occupied by the halftone dot portion on the predetermined printing surface can be obtained in the same range.

FIG. 5 is a view showing a state in which a card is punched out from a large core sheet. The cross section of the punching blade 30 and the card 1 when punching is shown. The entire punching blade mold is a rectangular frame that is the planar shape of one card. The material of the punching blade 30 is tungsten-based high-speed tool steel (SKH2; high-speed steel), and the tip of the punching blade 30 has a blade thickness of about 0.1 mm.

As shown in FIG. 5, when punching out one unit of card 1 from a large core sheet, the “blank” printed on the surface of the core sheet 100 is used as a mark, and the punching blade 30 is aligned and pressed. Punch out. For each card, punching is performed by sequentially moving the punching blade 30.
On the lower surface of the printed core sheet 100, a biaxially stretched PET sheet is placed as the cushion material 31. The lower surface of the cushion material 31 is provided with an amorphous aromatic polyester-based resin as an underlay to alleviate rapid wear of the punching blade. Each time about 15 cards are stacked inside a blade shape that is a rectangular frame shape, the card is pressed from the inside and discharged together. When the ink is peeled off, the peeled ink piece adheres to the side surface of the card 1.

During this punching process, there has been a problem that fine pieces of printed picture ink have been exfoliated (dropped off) in the past and adhere to the side face of the card (the side where the white layer of the core sheet is exposed). In particular, when punching, there was a tendency for the ink of the pattern on the lower surface side of the card, which the punching blade comes into contact later, to stand out. However, since the ink is dry, the ink pieces peeled off and attached can be removed by rubbing with a cloth or the like. By the method of the present invention, the peeling problem is almost solved for both the front and back inks. In addition, a micro is the maximum length dimension of a piece and is about 0.5 mm.

The following tests were conducted for the purpose of preventing the peeling of the pattern ink.
(Test Example 1)
As the core sheet 100, a polymer alloy resin (thickness 800 μm) of an amorphous aromatic polyester resin (PET-G resin) and a polycarbonate resin is used, and the offset anchor layer 201 is printed on the surface side 100u. 3 was offset printed as shown in FIG. This pattern 3 does not reach the rectangular punching line k (does not touch the punching blade).
In order to confirm the influence of only the ink peeling on the printing on the back side, no pattern is provided on the part in contact with the front side punching line k. An overprint layer 203 was printed on the entire surface of the pattern 3 with an ultraviolet curable offset ink.

On the back side 100d, after printing the offset anchor layer 301, as shown in FIG. 4, in order to reproduce gray, special color ink toned in gray is used, and the area occupied by halftone dots on the printed surface The halftone dot printing unit 4 was printed with an ultraviolet curable offset ink so that the rate was 10, 20, 30, 40, 50%, and 100% (solid printing). The halftone dot printing unit 4 is for a rectangular punching line k to be punched.
On the halftone dot printing unit 4, printing 5 of fine characters and patterns was performed with an ultraviolet curable offset ink. This fine character or pattern printing 5 is not applied to the portion in contact with the rectangular punching line k (not in contact with the punching blade). An overprint layer 303 was printed on the entire surface of the fine character or pattern print 5 with an ultraviolet curable offset ink.

(Test Example 2)
As the core sheet 100, a central support layer 101 is made of a resin composition mainly composed of a polymer alloy of a white polycarbonate resin having a thickness of 670 μm ± 20 μm and an amorphous aromatic polyester resin, and a thickness of 65 μm ± A core sheet (total thickness: 800 μm) having transparent laser coloring layers 102 and 103 made of a polymer alloy of 10 μm polycarbonate resin and amorphous aromatic polyester resin was used.
On the front side 100u, after the offset anchor layer 201 was printed, the pattern 3 as shown in FIG. 3 was printed with ultraviolet curable offset ink. This pattern 3 is not applied to the rectangular punching line k to be punched (does not touch the punching blade). In order to confirm the influence of only the printing on the back side, no pattern is provided on the part in contact with the front side punching line k. An overprint layer 203 was printed on the entire surface of the pattern 3 with an ultraviolet curable offset ink.

On the back side 100d, after printing the offset anchor layer 301, as shown in FIG. 4, a spot color ink toned in gray is used to reproduce gray, and the area ratio occupied by the halftone dot portion on the printing surface However, the halftone dot printing unit 4 was printed with an ultraviolet curable offset ink so as to be in stages of 10, 20, 30, 40, 50%, and 100% (solid printing). The halftone dot printing unit 4 is for a rectangular punching line k to be punched.
On the halftone dot printing unit 4, printing 5 of fine characters and patterns was performed with an ultraviolet curable offset ink. This fine character or pattern printing 5 does not cover the rectangular punching line k (does not touch the punching blade). An overprint layer 303 was printed on the entire surface of the fine character or pattern print 5 with an ultraviolet curable offset ink.

As a result of punching test of the core sheet of Test Example 1, the state of ink peeling at the time of punching in each dot area ratio was as shown in Table 1 below. In the peeling state, “◯” indicates that peeling is hardly observed, and “x” indicates that peeling is recognized remarkably.

As a result of the punching test of the core sheet of Test Example 2, the ink peeling state at the time of punching in each halftone dot area ratio is as shown in Table 2 below, which is the same result as in Test Example 1.

From the results of Tables 1 and 2, when the dot area ratio exceeded 30%, it was recognized that the ink peeled off at the time of punching. In the case of a dot area ratio of 10%, it may be difficult in terms of color tone matching with solid printing as in the following colorimetry test, but it has been confirmed that there is no problem of ink peeling.

(Colorimetry test)
Table 3 shows the core sheet itself in Test Example 1 above, the reflection density of the target ink of 10%, 20%, and 30% of the special color ink, and the color density measured in the Lab coordinates.
The reflection density value and the color tone were measured by “X-rite 530” manufactured by X-Rite.

From the results shown in Table 3, it was difficult to approximate the target special color ink solid printing by printing with a dot area of 10% using the gray special color ink because the reflection density was bright.
Accordingly, in terms of color tone, a gray spot color ink having a dot area ratio of 20 to 30% has a small color difference from that of the gray spot color ink and is a preferable result.

DESCRIPTION OF SYMBOLS 1 Card 3 Picture 4 Halftone dot printing part 5 Fine character and pattern printing 8 Dragonfly 30 Extraction blade 31 Cushion material 100 Core sheet 101 Support layer 102, 103 Laser coloring layer 201, 301 Offset anchor layer 202, 302 Picture layer 203, 303 Offset overprint layer k Punching line

Claims (2)

Single-layered card core sheet is printed and printed on the front and back sides of the card in the order of transparent offset anchor layer, offset and / or silk screen printing pattern layer, and transparent offset overprint layer in that order. In the card manufacturing method in which the oversheet is not laminated on the front and back surfaces of the card and punched into each card of the unit, the pattern printed surface on the front surface or back surface of the card at least in contact with the punching blade to be punched Is a printing method, and the pattern is configured so that the area ratio occupied by the halftone dot portion in the printing is in the range of 10 to 30%. Multi-sided on a single-layer card core sheet with a laser coloring layer on the front or back surface, the front and back side of the card can be printed on a transparent offset anchor layer, offset and / or silk screen printed picture layer, transparent offset overprint layer After printing in order, in the card manufacturing method in which the oversheet is not laminated on the front and back surfaces of the core sheet and manufactured by punching into each card of the unit, at least the part that contacts the punching blade to be punched A core sheet characterized in that the pattern printed surface on the front or back side of the card is offset printing, and the pattern is configured such that the area ratio occupied by the halftone dot portion by the printing is in the range of 10 to 30% Printing method.

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