JPS63104891A - Card made of plastic for certification - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a plastic card for identification used as a credit card, cash card, identification card, driver's license, commuter pass, etc. .

[Conventional technology]

Plastic cards for identification, such as credit cards and cash cards, are used for an extremely wide range of purposes these days as opportunities for card transactions are increasing. , optical recording by optical recording layer, hologram, imprint.

Plastic cards are used that combine facial photographs, engravings, signatures, information recording using IC memory, printing, bar codes, and other recording means.

[Problem that the invention seeks to solve]

By the way, the plastic card for proof of the present invention is
A distortion that is in sync with part or all of the printed pattern provided on the card is formed inside the card, and an emboss effect that is in sync with the pattern is expressed by the distortion, The present invention provides a plastic card for identification that exhibits anti-counterfeiting action and unique design characteristics.

[Failure to solve the problem]

The plastic card for proving the first invention is a laminate of a thermoplastic resin layer having a printed pattern layer and one or more thermoplastic resin layers in contact with the non-printing surface of the thermoplastic resin layer. A thermoplastic resin press-molded body whose upper and lower surfaces are smooth, that is, a printed pattern layer is exposed on the outermost surface of the thermoplastic resin press-molded body. The thermoplastic resin press-molded body has a first thermoplastic resin in contact with the printed pattern layer in the thickness direction of the thermoplastic resin press-molded body. The interface between the layer portion and the second thermoplastic resin layer portion in contact with the first thermoplastic resin layer portion is a convex arc-shaped surface consisting of a gentle slope and a steep slope that are convex toward the printed pattern layer side. This is what is considered to be my gentle slope.

Further, the plastic card for proving the second invention includes a thermoplastic resin layer having a printed pattern layer and one or more thermoplastic resin layers in contact with the printed surface of the thermoplastic resin layer. A thermoplastic resin press-molded body having a laminated structure, or a laminated structure of the laminated structure and another thermoplastic resin layer, and in which both the upper and lower surfaces of the thermoplastic resin molded body are smooth surfaces, that is, The thermoplastic resin press-molded body is made of a thermoplastic resin press-molded body having a multilayer structure in which a printed pattern layer exists between the thermoplastic resin layers, and the thermoplastic resin press-molded body is The interface between the thermoplastic resin layer and the printed pattern layer, which is located near the center of the thickness of the thermoplastic resin layer that is in contact with the printed pattern layer in the thickness direction of the resin press molded body, is the printed pattern layer. A convex arc-shaped surface consisting of a gentle slope convex to the side and a steep slope, which is considered to be a gentle slope.
It is.

Incidentally, FIG. 1 shows a thermoplastic resin press-molded body 3 constituting a plastic card for proving the first invention, and a first thermoplastic resin layer having a printed pattern layer m1. 1 and a second thermoplastic resin layer 2 that is in contact with the non-printing surface of the first thermoplastic resin layer 1. This is the case when the plastic identification card is composed of thermoplastic resin layers with a minimum number of laminated layers.

The thermoplastic resin press-molded body 3 has an upper surface 4 and a lower surface 5 that are both smooth surfaces, and the first layer in contact with the printed pattern layer m1 in the thickness direction of the press-molded body 3. A thermoplastic resin layer portion 1A and a second thermoplastic resin layer portion 2A that is in contact with the first thermoplastic resin layer portion 1A.
The interface 6 with the printing pattern layer m1 is a gentle slope 7 of a convex arc-shaped surface 9 consisting of a gentle slope 7 and a steep slope 8 that are convex toward the printed picture layer m1 side.

Moreover, FIG. 2 shows a thermoplastic resin press-molded body 13 constituting a plastic card for proving the second invention, in which a first thermoplastic resin layer 11 having a printed pattern layer m2 is shown. and a second thermoplastic resin layer 12 that is in contact with the printed surface of the first thermoplastic resin layer 11. This is the case when the plastic card is composed of thermoplastic resin layers with a minimum number of laminated layers. The thermoplastic resin press-molded body 13 has an upper surface 14 and a lower surface 15 that are both smooth surfaces, and has a heat-resistant surface that is in contact with the printed pattern layer m2 in the thickness direction of the press-molded body 13. The interface 16 between the printed pattern layer m2 and the second thermoplastic resin layer 12, which is a thermoplastic resin layer located near the center in the thickness direction of the plastic resin layer, has a convex arc shape toward the printed pattern layer m2 side. This is the gentle slope 17 of a convex arc-shaped surface 19 consisting of a gentle slope 17 and a steep slope 18.

In the first invention and the second invention, the convex arcuate surface formed at the interface between the thermoplastic resin layers in the thermoplastic resin press-molded body constituting the plastic card of each invention. The above-mentioned printing pattern layers m1 and m2 involved
is a concrete pattern, an abstract pattern, two letters, numbers, etc., and is a thermoplastic resin sheet serving as a thermoplastic resin layer, such as cellophane,
Sheets of acetate, polyethylene, polypropylene, polyester, polyvinyl chloride, polyvinylidene chloride, polystyrene, polycarbonate, polyvinyl alcohol, polyamide, etc. are made into thermoplastic resin sheets, gravure,
It is formed using colored or colorless printing ink using printing means such as screen, offset, flexography, and inkjet.

One of the thermoplastic resin layers in the thermoplastic resin press-molded product constituting the plastic card of each of the present inventions is composed of a thermoplastic resin layer that exhibits glitter and contains, for example, a pearl pigment. It has been confirmed that when the embossed layer is colored, the emboss effect that synchronizes with the colored printed pattern layer becomes more vivid. The thermoplastic resin layer having glittering properties is made of so-called glittering pigments, such as aluminum pigments and bronze pigments.

A layer that exhibits glittering properties using a pearl pigment or the like, such as a sheet obtained by peta printing or coating a transparent thermoplastic resin sheet with a printing ink using the pigment, a sheet in which the pigment is kneaded, and It is formed of a coating layer etc. containing the pigment, and when the thermoplastic resin layer having glitter is an upper layer than the printed pattern layer, the resin layer is transparent. It is necessary. Furthermore, there are cases in which the above-mentioned printed pattern layer is formed on the above-mentioned thermoplastic resin sheet that becomes the thermoplastic resin layer that exhibits glitter.

The thermoplastic resin press-molded body constituting the plastic card for proving the first invention having the above configuration is as follows:
a decorative sheet that is a thermoplastic resin layer having a printed pattern layer;
When a thermoplastic resin press-molded body is obtained by subjecting a stacked body of one or more thermoplastic resin layers in contact with the non-printing surface of the decorative sheet to press molding, as the decorative sheet, The printed pattern layer and the thermoplastic resin sheet constituting the decorative sheet are selected to have different thermal melting behavior at the same temperature, and the heating and processing when the stacked body is subjected to press molding is selected. By being subjected to pressure, the decorative sheet is brought into contact with at least the printed pattern layer constituting the decorative sheet in the stacked body, the thermoplastic resin sheet, and the thermoplastic resin layer in contact with the decorative sheet. The requirements are that the thermoplastic resin in the vicinity of the part melts, and that cooling is started after the thickness of the thermoplastic resin involved in compression during press molding has been compressed to 90 to 40 inches at the start of press molding. It can be easily obtained by performing press molding in a manner that satisfies the following.

Further, the thermoplastic resin press-molded body constituting the plastic card for proving the second invention is brought into contact with a decorative sheet, which is a thermoplastic resin layer having a printed pattern layer, and a printed surface of the decorative sheet. When a thermoplastic resin press-molded body is obtained by subjecting a stacked body of thermoplastic resin layers having a thermoplastic resin layer as an essential component to press molding, the decorative sheet is used as the decorative sheet. Selecting a printed pattern layer and a thermoplastic resin sheet that have different thermal melting behavior at the same temperature, and subjecting the superimposed body to heat and pressure when subjected to press molding. As a result, at least the printed pattern layer constituting the decorative sheet in the stacked body and the thermoplastic resin near the printed pattern layer including the portion in contact with the printed pattern layer are melted, and press molding By performing press molding in a manner that satisfies the requirement that cooling should be started after the thickness of the thermoplastic resin layer involved in compression has been compressed to 90 to 40 inches at the start of press molding. That's what you get.

In addition, each press molding condition when obtaining the thermoplastic resin press-molded body constituting the plastic card for proving each of the inventions described above, that is, the plastic card for proving the first invention. The molding conditions for obtaining a thermoplastic resin press-molded body are as follows: During heating during press molding, at least the printed pattern layer constituting the decorative sheet and the thermoplastic resin sheet in the stacked body of thermoplastic resin layers are heated. The thermoplastic resin near the contact area of the decorative sheet in the thermoplastic resin layer that is in contact with the decorative sheet melts, and the thickness of the thermoplastic resin layer involved in compression during press molding changes at the start of press molding. The thermoplastic resin press-molded body constituting the plastic card for proving the second invention [During heating in press molding, the thermoplasticity of the thermoplastic resin layer in the vicinity of the printed pattern layer, including at least the portion in contact with the printed pattern layer constituting the decorative sheet, in the stacked body of thermoplastic resin layers. Satisfies the conditions of ``melting the resin, and starting cooling after the thickness of the thermoplastic resin layer involved in compression during press molding has been compressed to 90 to 40 inches at the start of press molding.'' Regarding the press molding conditions, the temperature during press molding is generally higher than that used to obtain a conventional general thermoplastic resin press molded body, and the degree of pressurization is also generally higher. temperature, usually 100-200°C2
Pressure 10-80kg/c4. Press molding conditions of about 10 to 60 minutes are used.

In addition, the above-mentioned press molding conditions when press molding the stacked body of thermoplastic resin layers are such that the thickness of the thermoplastic resin layer involved in compression during press molding is 90 to 40% of that at the start of press molding. The "point of compression" is when the press pressure is kept constant throughout the pressurization period, i.e., when the initial maximum press pressure is maintained, press molding where the press pressure is gradually reduced during the pressurization period. It has been found that this can be achieved in about 1/2 the pressing time compared to the method.

Furthermore, the decorative sheet, which is a thermoplastic resin layer having a printed pattern layer in the stacked body of thermoplastic resin layers subjected to the press molding, may be made of, for example, cellophane, acetate,
Polyethylene, polypropylene, polyester, polyvinyl chloride.

A thermoplastic resin sheet such as polyvinylidene chloride, polystyrene, polycarbonate, polyvinyl alcohol, polyamide, etc., preferably a polyvinyl chloride sheet, for example,
A colored or colorless printed pattern layer is formed using a printing method such as gravure, screen, offset, flexible, or inkjet. It is necessary that the thermal melting behavior of the printed pattern layer and the printed pattern layer be different at the same temperature, for example, that the melting points of the two are different. It should be noted that the layers other than the decorative sheet in the stack of thermoplastic resin layers subjected to the press molding 1 may be applied in a powder state.

In addition, when molding the thermoplastic resin press-molded body constituting the plastic card for proving the present invention by the above-described press-molding method, the overlapping body of thermoplastic resin layers subjected to molding is used. An intervening film selected from polyester film, nylon film, fluororesin film, and vinylon film is placed on at least one of the upper and lower sides, that is, press-molded by heating and pressure during press-molding. The thermoplastic resin layer has heat resistance that does not cause heat welding to the stacked body surface or mold surface, low elongation when heated, good peelability, and excellent surface strength. or at least one of the upper and lower end surfaces of the entire circumferential side of the stacked thermoplastic resin layer to be molded is in contact with an intervening film consisting of a release film having By press-molding the stacked body of the thermoplastic resin layers using a frame body that matches the pattern that appears due to the distortion formed inside the resulting thermoplastic resin press-molded body. It has been confirmed that a press molded product with a clear embossing effect can be obtained.

The mechanism by which the thermoplastic resin press-molded body obtained under the above-mentioned press molding conditions becomes a thermoplastic resin press-molded body that exhibits an embossed effect that synchronizes with the pattern is that during press-molding of the above-mentioned stacked body of thermoplastic resin layers, The printed pattern layer and two or more thermoplastic resin layers in contact with the printed pattern layer in the thickness direction are melted and fluidized, and the thermoplastic resin sheet and the printed pattern layer in the decorative sheet are melted at the same temperature. Distortion caused by differences in flow behavior, that is, differences in thermal melting behavior during press molding, may be formed in the thermoplastic resin layer that is in contact with the pattern layer in the thickness direction, or may be caused by distortion in the thickness direction between the pattern layer and the pattern layer. It is formed on the thermoplastic resin layer that is in contact with the embossed layer, thereby creating an embossed effect that is synchronized with the pattern. When press-molding the above-mentioned stacked body of thermoplastic resin layers, the distortion is formed at the interface between the thermoplastic resin layers,
The details of the mechanism by which the emboss effect in which the printed pattern layer protrudes from the center in the thickness direction of the thermoplastic resin press-molded body onto the surface (or back surface) of the molded body is obtained is presumed to be as follows.

First, in the case of obtaining a thermoplastic resin press-molded body constituting a plastic card for proving the invention of water bottle 1,
In addition, if the melting temperature of the resin vehicle constituting the printed pattern layer in the decorative sheet is lower than the melting temperature of the thermoplastic resin sheet in the decorative sheet, when the temperature of the molding material rises after the start of press molding, the pattern layer first The part melts, and an intermediate stage is achieved in which the flow resistance in the horizontal direction in the thickness direction of the forming material between the melted part and the press surface plate decreases, and the press forming further progresses and the entire part softens. , and will be under pressure. For this reason, the thermoplastic resin layer in the molding material starts to flow, but this flow is slower in areas near the press surface plate than in areas farther away, so the flow rate is lower in the thickness direction. A distribution occurs. As described above, this flow is not particularly suppressed in the pattern layer and the thermoplastic resin layer portion that is in contact with the pattern layer in the thickness direction because the resistance of this layer to the press surface plate is small. It is presumed that the pressure in the parts where the flow rate is high is greater, and in such a state distortion occurs and is no longer fixed.

In addition, when obtaining a thermoplastic resin press-molded body constituting the plastic card for proving the invention in Bookcase 2,
In addition, if the melting temperature of the resin vehicle constituting the printed pattern layer in the decorative sheet is lower than the melting temperature of the thermoplastic resin sheet in the decorative sheet, when the temperature of the molding material rises after the start of press molding, the pattern will first disappear. An intermediate layer in which the layer portion is melted and the flow resistance in the horizontal direction with respect to the thickness direction of the molding material is reduced by the thermoplastic resin sheet and the thermoplastic resin layer at least in the upper and lower parts in the thickness direction of the pattern layer. Once this stage is achieved, the press molding progresses and the whole becomes soft and is placed under pressure. For this reason, the thermoplastic resin layer in the molding material starts to flow horizontally, but this flow is slower in areas near the press platen than in areas farther away, so the thickness A distribution occurs in the flow velocity in the direction. Then, in the pattern layer portion, this flow is caused at least above the pattern layer,
This is facilitated by a reduction in the resistance to horizontal flow between the thermoplastic resin layer and the thermoplastic resin sheet that are in contact with the bottom, and the pressure in the areas where the flow rate is high becomes greater, and under such conditions, distortion occurs and fixation occurs. It is presumed that this is because the

In the case of obtaining a thermoplastic resin press-molded body constituting the plastic card for proving the invention in Bookcase 1, and
When the melting temperature of the resin constituting the printed pattern layer in the decorative sheet is higher than the melting temperature of the thermoplastic resin sheet in the decorative sheet, when the temperature of the molding material rises after the start of press molding, the decorative sheet) K The non-printing surface of the thermoplastic resin sheet melts, and an intermediate stage is realized in which the flow resistance in the horizontal direction in the thickness direction of the molding material between the melted part and the press platen is reduced, and further the press As the molding progresses, the entire part becomes soft and is placed under pressure. For this reason, the flow of the thermoplastic resin layer in the material for molding begins, but this flow is slower in areas near the press surface plate than in areas farther away, so the thickness of the material for molding A distribution occurs in the flow velocity in the direction. This flow is promoted in the non-printed pattern layer portion of the thermoplastic resin sheet because the resistance of this layer to the press platen is small, as described above, and the pressure in the portion where the flow rate is high is higher. grow bigger,
It is presumed that this is because distortion occurs and is fixed in such a state.

In addition, when obtaining a thermoplastic resin press-molded body constituting the plastic card for proving the invention in Bookcase 2,
In addition, if the melting temperature of the resin constituting the printed pattern layer in the decorative sheet is higher than the melting temperature of the thermoplastic resin sheet in the decorative sheet, when the temperature of the molding material rises after press molding starts, the decorative sheet first There is an intermediate stage in which the non-printing pattern layer surface of the thermoplastic resin sheet melts and the flow resistance in the horizontal direction with respect to the thickness direction of the molding material is reduced in the thermoplastic resin layer at least above and below the non-printing pattern layer surface. Once this is achieved, the press molding progresses further, softening the entire body, and placing it under pressure.

For this reason, the thermoplastic resin layer in the molding material starts to flow in the horizontal direction, but this flow is slower in areas near the press surface plate than in areas farther away, so A distribution occurs in the flow velocity in the horizontal direction. Then, a distribution occurs in this flow velocity. This flow is promoted in the non-printed pattern layer surface portion because the resistance to horizontal flow is reduced in the thermoplastic resin layer that is in contact with at least the top and bottom of the non-printed pattern layer surface in the thickness direction. It is presumed that this is because the pressure in the faster speed section becomes greater, and in this state distortion occurs and becomes fixed.

In addition, when obtaining the thermoplastic resin press-molded body constituting the plastic card for proving the first invention by the above method, the melting point of the thermoplastic resin (vehicle) in the printed pattern layer of the decorative sheet If the difference between the melting point of the thermoplastic resin sheet and the thermoplastic resin sheet in the decorative sheet is 5°C or more, a sufficiently effective embossing will appear, and the decorative sheet
It has been confirmed that an even higher embossing effect can be obtained when the thermoplastic resin sheet constituting the sheet and the thermoplastic resin layer in contact with the sheet have different thermal melting behavior. In addition, when obtaining a thermoplastic resin press-molded body constituting the plastic card for proving the second invention by the above-mentioned method, the melting point of the thermoplastic resin (vehicle) in the printed pattern layer and the above-mentioned The difference between the melting point of the thermoplastic resin layer that is in direct contact with the printed pattern layer is 5℃.
A sufficiently effective embossing effect is obtained when the above conditions exist, and an even higher embossing effect is obtained when the thermoplastic resin layers that constitute both the upper and lower layers of the printed pattern layer have different thermal melting behavior. It has been confirmed that this can be obtained. Also,
There is no particular limit on the upper limit of the difference between the melting point of the vehicle in the printed pattern layer and the melting point of the thermoplastic resin layer that is in direct contact with the printed pattern layer, but due to handling workability, raw material, and material problems, etc. A practically usable melting point temperature difference is up to about 40°C.

Further, when obtaining a thermoplastic resin press-molded body constituting the plastic card for proving each of the present inventions by each of the above-mentioned methods, the thermoplastic resin layer in the molding material subjected to press molding. When the pattern layer is present at or near the center in the thickness direction of the printed pattern layer, it is difficult to produce an emboss effect due to distortion occurring at the interface between the thermoplastic resin layers. If the type of thermoplastic resin in the lower thermoplastic resin layer is the same, the above-mentioned emboss effect is difficult to appear, so the printed pattern layer is placed above the thermoplastic resin layer in the thickness direction, that is, the resulting press It is preferable to use a plastic card made of a thermoplastic resin press-molded body that is exposed above the center of the thermoplastic resin layer in the molded body.

Furthermore, when obtaining a thermoplastic resin press-molded body constituting the plastic card for proving each of the present inventions by each of the above-mentioned methods, at least one side of the molding material that is the thermoplastic resin layer subjected to molding. When press-molding is performed by interposing the intervening film or by bringing the frame into contact with the molding material, at least one of the upper and lower sides of the molding material is pressed during the press-molding process of the molding material. This is caused by the difference in flow behavior during thermal melting at the same temperature as the pattern layer of the thermoplastic resin sheet in the decorative sheet mentioned above, since the degree of deformation that extends in the horizontal direction is suppressed or prevented. The distortion becomes more pronounced, and it becomes easier to obtain a plastic card for identification made of a thermoplastic resin press-molded body with a clear embossed effect that matches the pattern.

Furthermore, the thermoplastic resin press-molded body constituting the plastic card for proving each of the present inventions can also be molded by a roll press method.

〔Example〕

The specific structure of the thermoplastic resin press-molded body constituting the plastic card for proving the actual invention will be described below with reference to manufacturing examples.

Example 1 Pearl pigment kneaded into vinyl chloride resin, thickness 0.54
A white polyvinyl chloride film with a pearlescent luster of 11+ is printed with characters on the front surface using an offset printing method using printing ink containing a salt-vinyl acetate/acrylic binder, and a fine background pattern is printed on the back surface. Each was formed to obtain a decorative sheet.

Next, the back side of the decorative sheet was coated with a thickness of Q, lmy.

A transparent polyvinyl chloride film with a thickness of 100 μm and a magnetic recording layer with a width of 6.5 nm on a part of the surface was placed on the surface of the decorative sheet, and a transparent hard polyvinyl chloride film with a thickness of 100 μm was placed on the back side of the film. Lay them on each other so that the surfaces of the decorative sheets are in contact with each other, and heat the resulting stack at 150°C using the upper and lower two stainless steel plates as backing plates.
It was placed between two hot plates and press-formed at an initial pressure of 40 kV/lri, and when the pressure reached 20 H/l, a after 10 minutes, water cooling was started and the temperature of the hot plates was raised to 25°C in 15 minutes. A thermoplastic resin press-molded article having both upper and lower surfaces with smooth surfaces was obtained by press-molding, which consisted of cooling to a temperature of 100 mL. Note that the press pressure during water cooling in the press molding process was maintained at 10 Jet/crl.

Thereafter, the obtained press molded body was punched into a rectangular shape of about 54 x 851 m using a punching die, and
A plastic card for certification was obtained, consisting of a magnetic card with both lower surfaces smooth.

The obtained plastic card for identification has a surface layer composed of a transparent layer, and the character printing layer formed through the transparent layer has a printing ink convex on the surface layer side of the plastic card. It protrudes, and on the back of the card,
The printing ink that makes up the background pattern protrudes from the back layer of the plastic card, creating an embossed effect that matches the pattern.

When the cross section of the plastic card was observed with a magnifying glass, it was found that the interface between the character printing layer and the pearlescent white polyvinyl chloride film layer was a gentle slope that formed a convex arc toward the character printing layer. It was confirmed that the surface corresponds to a gentle slope of a convex arc-shaped surface consisting of a steep slope, and the interface between the tint block printing layer and the white polyvinyl chloride film layer having pearlescent luster is directed toward the tint block printing side. It was confirmed that the surface corresponds to the gentle slope of a convex arc-shaped surface consisting of a gentle slope and a steep slope.

[Operation and effect of the invention]

The plastic card used to prove each of the present inventions is made of a thermoplastic resin press-molded body with a multilayer structure, and the thermoplastic resin press-molded body that constitutes the plastic card is made of a thermoplastic resin press-molded body. The distortion is visible as it overlaps with the printed pattern layer, and the synchronization between the pattern and the emboss is perfect, and the emboss effect is produced by internal distortion, so it is observed to be exaggerated compared to the actual unevenness. In other words, it has a pronounced embossed effect.

Therefore, the plastic card for identification of the present invention has an emboss effect based on internal distortion due to its unique shape, and is not only novel in design, but also has excellent anti-counterfeiting performance. It is effective.

In addition, the plastic card for proving the actual invention can be manufactured into a plastic card with an embossed effect that matches the pattern without going through the embossing process, which is the process of producing the embossed effect. By simply adjusting the press-molding material, press-molding conditions, etc. when obtaining the thermoplastic resin press-molded body that makes up the plastic card, it is possible to obtain a plastic card in which the degree of distortion of the embossing effect is appropriately adjusted. It also has the function and effect of

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of a main part of an example of a thermoplastic resin press-molded product constituting a plastic card for proving the first invention, and Fig. 2 is a proof of the second invention. FIG. 2 is an enlarged sectional view of a main part of an example of a thermoplastic resin press-molded body constituting a plastic card for use in the United States. ml: Printed pattern layer, 1: Thermoplastic resin layer having a printed pattern layer, 2. Thermoplastic resin layer in contact with the non-printing surface of thermoplastic resin layer 1, 3: Thermoplastic resin press molded product, 4.
Upper surface of nibless molded body 3, lower surface of nibless molded body 3, 1A thermoplastic resin layer portion in contact with printed pattern layer m1 in the thickness direction of nibless molded body 3, 2A: heat in contact with thermoplastic resin layer portion 1A Plastic resin layer portion, 6: interface between thermoplastic resin layer portion 1A and thermoplastic resin layer portion 2A,
9: Convex arcuate surface.

Claims (2)

[Claims] (1) Certification plastic consisting of a thermoplastic resin press-molded body of a thermoplastic resin layer having a printed pattern layer and one or more thermoplastic resin layers in contact with the non-printing surface of the thermoplastic resin layer. In the thermoplastic resin press-molded article, the thermoplastic resin press-molded article has a first thermoplastic resin layer portion that is in contact with the printed picture layer in the thickness direction of the thermoplastic resin press-molded article; The interface with the second thermoplastic resin layer portion in contact with the printed pattern layer is a gentle slope of a convex arc-shaped surface consisting of a gentle slope and a steep slope that form a convex arc toward the printed pattern layer side, and A plastic card for identification, characterized in that both the upper and lower surfaces of the thermoplastic resin press-molded body are smooth. (2) A plastic card for certification comprising a thermoplastic resin press-molded body of a thermoplastic resin layer having at least a printed pattern layer and a thermoplastic resin layer in contact with the printed surface of the thermoplastic resin layer, The thermoplastic resin press-molded body includes a thermoplastic resin layer located near the center in the thickness direction of the thermoplastic resin layer that is in contact with the printed pattern layer in the thickness direction of the thermoplastic resin press-molded body; The interface with the printed pattern layer is a gentle slope of a convex arc-shaped surface consisting of a gentle slope and a steep slope that form a convex arc toward the printed pattern layer side, and A plastic identification card characterized by having smooth upper and lower surfaces.