JP2003053600A - Plate for hot press, hot press device provided with the same and sheet laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate for hot press and a hot press device provided with the same which allows hot pressing between sheet materials without generating a surface pressure distribution gradient and suppresses the occurrence of irregularity of thickness and defective interlayer adhesion. SOLUTION: In this plate for hot press, a recessed housing part 20 which has almost the same shape with a sheet material 13, has dimensions capable of housing the sheet material 13 and has a depth size smaller than the thickness size of the sheet laminate is disposed on a narrow pressure surface of a lower plate member 12b constituting the plate 11 for hot press. Thereby, the surface pressure distribution for the sheet material 11 on the hot pressing is uniformized and the defective interlayer adhesion on the peripheral part of sheet material 13 and the irregularity of thickness is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-pressing plate suitable for use in, for example, a manufacturing process of an IC card, a hot-pressing apparatus including the same, and a sheet laminate.

[0002]

2. Description of the Related Art Conventionally, there has been a non-contact type IC card (hereinafter referred to simply as an IC card) which can read and write signals by using radio waves and can communicate with a system in a pocket or a bag. Are known. An IC card is usually constructed by laminating a plurality of sheet-shaped card constituent base materials on both sides of an antenna substrate on which an IC chip is mounted.
Not only the IC card but also a card-type sheet laminated body formed by laminating a plurality of sheet materials such as a magnetic card laminated with a magnetic stripe layer, for example, by utilizing thermocompression bonding by a heat press device. Manufactured.

FIG. 6 shows a thermocompression bonding process for a sheet-shaped card constituting base material, which is one manufacturing process of an IC card. After a plurality of sheet materials 3 are collated and laminated on the narrow surface 2c of the lower plate member 2b constituting the hot press plate 1, these sheet materials 3 are passed through the upper plate member 2a and the lower plate member 2b. Press board 7a heated to a predetermined temperature,
Thermocompression bonding is performed with a predetermined pressure by 7b. The sheet material 3 is bonded to, for example, an antenna substrate 4 on which an IC chip is mounted, core sheets 5a and 5b as exterior materials bonded to both surfaces of the antenna substrate 4, and main surfaces of the core sheets 5a and 5b. It is composed of overcoat layers 6a, 6b and the like having a pattern or the like. These sheet materials 3 are made of a synthetic resin material, and each of the sheet materials 3 has a size capable of taking a plurality of predetermined card sizes. After the thermocompression bonding, a predetermined cooling process is performed and then the pressing is completed. The completed sheet laminated body is taken out and punched into a predetermined card size to obtain an IC card.

As a prior art for manufacturing an IC card by laminating and adhering the card-constituting base materials by hot pressing as described above, there is, for example, the one described in Japanese Patent Laid-Open No. 2000-182014.

[0005]

The lamination and adhesion of the sheet materials 3 by the thermocompression bonding method is mainly performed by fusion at the interface between the sheet materials 3. For example, 1 ton per card at 100 ° C to 200 ° C. The hot press is performed under the conditions of high temperature and high pressure. At this time, as schematically shown in FIG. 7, the core sheets 5a and 5b and the overcoat layers 6a and 6b are in a semi-molten state and slightly flow in a direction perpendicular to the pressing direction (horizontal direction). Will be done. For this reason, as shown in FIGS. 8A and 8B, the outer shape of the produced sheet laminate body 8 is in a form in which the peripheral edge of the sheet material 3 before lamination is expanded so as to project outward ( In the figure, it is shown slightly exaggerated).

Therefore, when the sheet material 3 is thermocompressed, the peripheral portion of the sheet material 3 flows, so that a pressure distribution gradient is generated in the plane of the sheet material 3 as shown in FIGS. 9A and 9B.
As a result, the surface pressure of the peripheral portion of the sheet material 3 is lower than that of the inner central portion of the sheet material 3, which causes uneven thickness and delamination due to poor adhesion.

Therefore, in order to avoid such a defect, for example, as shown in FIG. 10, the region near the peripheral portion of the sheet laminated body 8 is not used as a product (IC card) 9,
The actual situation is that the product 9 is taken out by selecting an area on the inner side thereof, which is less affected by the decrease in surface pressure. For this reason, it is necessary to secure an extra area, which is not a product, in the sheet laminated body 8 as the blank portion 10, which causes another problem that the material cost is increased and the production efficiency is deteriorated.

As a method for equalizing the surface pressure, an autoclave type press in which a plurality of laminated sheet materials are wrapped with a resin film, defoamed inside by vacuum, and heated and pressurized by a pressurized gas in a pressure vessel. There is also a pneumatic pressure press, a surface pressure distribution control device that uses a hydraulic control device, etc., but these are all large-scale equipment, and the economical efficiency at the time of introduction because a vacuum device and a hydraulic control device are required. In addition, there is a problem that maintenance such as maintenance is difficult.

The present invention has been made in view of the above problems, and enables thermocompression bonding between sheet materials without generating a surface pressure distribution gradient, and suppresses unevenness in thickness and defective interlayer adhesion, thereby reducing material cost. An object of the present invention is to provide a hot press plate capable of preventing an increase and a deterioration in production efficiency, a hot press device including the plate, and a sheet laminate.

[0010]

In order to solve the above-mentioned problems, a hot-pressing plate of the present invention and a hot-pressing apparatus including the same are provided with a sheet material on a narrow pressure surface of one of a pair of plate members. It is characterized in that an accommodating recess having substantially the same shape as the accommodating member and having a size capable of accommodating a sheet material and having a depth dimension smaller than the thickness dimension of the sheet laminated body is provided.

The sheet material accommodated in the accommodating recess having the above structure is softened by the heat transmitted from the pair of plate members and becomes in a flowable state. In this state, by increasing the narrow pressure of the plate member, it is possible to apply a uniform pressure to almost the entire surface of the sheet material in the recess, and as a result, the surface pressure distribution is made uniform and the sheet laminate is formed. Can be formed. As a result, it is possible to reduce the occurrence of card defects such as uneven thickness and interlayer peeling due to interlayer adhesion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a hot press plate 11 in a hot press apparatus according to this embodiment.
The hot press plate 11 is composed of an upper plate member 12a and a lower plate member 12b.
It is arranged between 7a and 17b.

Upper plate member 12a and lower plate member 1
In this embodiment, various constituent base materials of the IC card are laminated and arranged between the sheet 2b and the sheet 2b. The sheet material 13 is, for example, an antenna substrate 14 on which an IC chip is mounted, and core sheets 15a and 15b as exterior materials adhered to both surfaces of the antenna substrate 14.
And the overcoat layers 16a and 16b, etc., having a pattern or the like adhered to the main surfaces of the core sheets 15a and 15b.

In the present embodiment, the narrow plate 12c of the lower plate member 12b is provided with the accommodation recess 20 as shown in FIG. The accommodation recess 20 has substantially the same shape as the sheet material 13 (rectangular shape in the present embodiment),
It is formed in a size that can accommodate the sheet material 13. Further, the depth of the accommodation recess 20 is set to a dimension value smaller than the laminated thickness of the sheet material 13. That is, as shown in FIG. 2A, the depth d of the accommodation recess 20 is set smaller than the thickness dimension D of the sheet laminated body 18 formed by thermocompression bonding of the sheet material 13.

The relationship between D and d is set so that the value of D-d is 5 to 100 μm. If the value of D-d is too small, the pressing force is less likely to be applied to the sheet material 13, and conversely, if the value of D-d is too large, the outflow amount of the resin increases. The range of this D-d value is the sheet material 13
It is appropriately set depending on the type of the constituent resin material.

Specifically, in the present embodiment, the sheet material 1
3 (core sheets 15a, 15b and overcoat layer 1
6a and 16b) are made of hot melt resin material,
In this case, D = 0.8 mm, d = 0.70 to 0.75 m
m, therefore the value of D-d is set to 50-100 μm. If it is a PET material, D-d is 60 μm.
Good results have been obtained with m. The clearance between the inner wall of the accommodation recess 20 and the sheet material 13 is about 5 μm.
I am trying.

On the other hand, as shown in FIG. 1, the accommodating recess 20 is formed directly on the narrow surface 12c of the lower plate member 12b, or as shown in FIGS. 5A and 5B, the lower plate member 22 is formed. A frame plate member 23 having a predetermined thickness (corresponding to the above d) having a rectangular opening at the center is attached to the narrow pressure surface 22c by a screw member 24 or the like, and the narrow pressure surface 22c of the lower plate member 22 and the plate frame member 23 are attached. The recess 25 formed by the opening inner wall 23a can be configured as the accommodation recess. According to this configuration, the depth of the accommodation recess can be adjusted only by changing the frame plate member 23, and it is not necessary to prepare a plurality of lower plate members having different accommodation recess depths. It is possible to suppress an increase in cost.

Since the frame plate member 23 is thin,
The head portion 24a of the screw member 24 projects upward from the upper surface of the frame plate member 23. In this case, the head portion 24 is located at a corresponding portion of the upper plate member 21 as shown in FIG. 5B.
A recess 21a for accommodating a is formed to prevent the upper plate member 21 and the screw member 24 from interfering with each other when the sheet material is compressed. Here, in FIG. 5B,
The illustration is shown somewhat schematically for clarity of explanation.

Next, the operation of the present embodiment configured as described above will be described.

Referring to FIG. 1, first, the lower plate member 1
For the accommodation recess 20 of 2b, the sheet material 13 includes the oversheet layer 16b, the core sheet 15b, and the antenna substrate 1.
4, the core sheet 15a, and the oversheet layer 16a are stacked in this order. The stacking work of these sheet materials 13 can be performed by an automatic transfer device such as a robot.

After stacking the sheet materials 13, the upper plate member 1
The upper and lower press plates 17 covered with 2a and heated to a predetermined temperature
Press with a and 17b (FIG. 2A). At this time,
The depth dimension d of the accommodation recess 20 is the laminated thickness D of the sheet material 13.
Since it is formed smaller than the upper plate member 12,
a does not come into contact with the lower plate member 12b, and the pressing pressure of the press plates 17a and 17b is entirely
Will be added to. As a result, the sheet material 13
Is narrowed by the plate members 12a and 12b, softened by the heat and pressure transmitted through the plate members 12a and 12b, and becomes a state in which it can flow in a direction perpendicular to the pressing direction.

Therefore, in the present embodiment, FIG.
As shown in FIG. 5, the sheet material 13 is subjected to a predetermined pressing action in the accommodation recess 20, whereby the flow of the constituent material of the sheet material 13 in the outer peripheral direction is restricted,
Even pressure is applied to each part (Pascal's principle). Further, the gap G (≈D−d) between the upper plate member 12a and the lower plate member 12b functions as an air vent, but almost flows out into the gap G due to the viscosity of the constituent material of the sheet material 13. There is no such thing. The size of the gap G is slightly smaller than the size of D-d due to the decrease in the laminated thickness of the sheet material 13 due to the thermocompression bonding action.

Therefore, according to this embodiment, the sheet material 13 between the pair of plate members 12a and 12b is formed.
The surface pressure distribution of the sheet material 13 can be made uniform from the inner central portion to the peripheral portion (FIG. 2C).
Will be thermocompression bonded without causing interlayer adhesion failure or uneven thickness of the sheet laminate at the peripheral portion thereof.

After the predetermined heating press is completed, the press plates 17a and 17b are connected to the cooling source from the heating source, whereby the sheet material 13 is cooled and pressed. After completion of this predetermined cooling press process, the plate members 12a, 1
The sheet laminated body 18 (FIG. 3A) is taken out from 2b and supplied to the punching step (FIG. 4) into a single card size.

Here, in the sheet laminated body 18 produced according to the present embodiment, a step S is formed in the thickness direction at the side end portion 18a as shown in FIG. It has a protruding portion 18b protruding outward from the end portion 18a. The protruding portion 18b is configured by the resin outflow into the gap G between the upper and lower plate members 12a and 12b during hot pressing, and as a result of receiving the pressing pressure evenly in each portion in the accommodation recess 20. It is formed by the surplus resin flowing out.

Therefore, according to the sheet laminated body 18 of the present embodiment, even in the region near the side end portion 18a thereof, the thickness unevenness and the interlayer adhesion defect are reduced by the predetermined pressing action, so that the structure shown in FIG. As shown in FIG. 7, the card finished body C can be taken out without forming a blank portion at the peripheral edge as compared with the conventional sheet laminated body 8. This makes it possible to increase the productivity by taking out more card finished products than the conventional one in the case of a sheet laminated body having the same area as the conventional one. It becomes possible to reduce the material area by reducing the body area.

In addition, the plate member 12a having the above structure,
According to the hot press device of the present embodiment equipped with 12b,
Since the above effect can be obtained only by forming the accommodating recess 20 in the conventional plate member, particularly in the lower plate member, the facility cost can be kept low, the maintainability is excellent, and the present invention can be easily performed. Can be carried out. Further, the press pressure is efficiently applied to the sheet material 13
Since it can be transmitted to, the energy saving of the device can be achieved.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above-mentioned embodiments, a mode in which a plurality of card finished bodies C are taken out from the sheet laminated body 18 has been described, but instead of this, various sheet materials 13 are formed in a single card size and manufactured. The present invention is also applicable to a form in which the above sheet laminate is directly used as a product.

Further, in the above embodiments, the example in which the present invention is applied to the manufacturing process of the IC card has been described, but the present invention is not limited to this, and an ID having a magnetic stripe layer attached thereto is used.
The present invention can be applied to a manufacturing process of a magnetic card such as a card.

[0032]

As described above, according to the present invention, the following effects can be obtained.

That is, according to the hot pressing plate of the present invention, the surface pressure distribution of the sheet material that is narrowed between the pair of plate members can be made uniform from the inner central portion to the peripheral portion thereof. It is possible to reduce defective interlayer adhesion at the peripheral portion of the sheet material and uneven thickness of the sheet laminated body, which can prevent increase of material cost and deterioration of production efficiency.

According to the second aspect of the invention, the depth of the accommodation recess for accommodating the sheet material can be easily adjusted, and an increase in equipment cost can be suppressed.

Further, according to the hot pressing apparatus of the present invention, the equipment cost required to make the surface pressure distribution uniform can be kept low, and the maintainability is excellent,
The present invention can be easily implemented. Moreover, since the pressing pressure can be efficiently transmitted to the sheet material, energy saving of the apparatus can be achieved.

According to the third aspect of the invention, the depth of the accommodation recess for accommodating the sheet material can be easily adjusted, and an increase in equipment cost can be suppressed.

According to the sheet laminate of the present invention,
Even in the region near the side edges, uneven thickness and poor interlayer adhesion are reduced by receiving a predetermined pressing action, so compared to conventional sheet laminates, the product can be manufactured without forming a blank part at the peripheral edge. Obtainable. As a result, in the case of a sheet laminate having the same area as the conventional one, it is possible to take out more products than in the past to improve the productivity, and if the number of products taken out is the same as the conventional one, the sheet laminate It is possible to reduce the material cost by reducing the area.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a hot press apparatus including a hot press plate according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the relationship between the hot pressing plate and the sheet material according to the embodiment of the present invention, where A shows the relationship between the depth of the accommodation recess and the laminated thickness of the sheet material, and B shows the heat. The direction of the pressure acting on each part of the sheet material during pressing is shown, and C indicates the surface pressure distribution of the pressure acting on the sheet material.

FIG. 3 shows a sheet laminate according to an embodiment of the present invention, where A is a front view and B is an enlarged view of part A in FIG. 3A.

FIG. 4 is a perspective view showing a product punching process of the sheet laminate according to the embodiment of the present invention.

5A and 5B are views showing a modified example of the configuration of the lower plate member according to the embodiment of the present invention, in which A is an exploded perspective view and B is a sectional view schematically showing a main part.

FIG. 6 is a perspective view showing a configuration of a conventional hot press plate.

FIG. 7 is a side view illustrating the behavior of the sheet material when hot pressing is performed using a conventional hot pressing plate.

FIG. 8 is a diagram illustrating a difference in planar shape between a sheet material and a sheet laminated body after hot pressing according to a conventional technique.
Is a plan view of the sheet material, and B is a plan view of the sheet laminate.

FIG. 9 is a diagram showing a pressure distribution gradient when hot pressing is performed using a conventional hot pressing plate, in which A shows a surface pressure distribution in the width direction of the sheet material and B shows an in-plane surface of the sheet material. The pressure distribution is shown.

FIG. 10 is a perspective view illustrating a product punching process of a sheet laminate manufactured using a conventional hot pressing plate.

[Explanation of symbols]

11 ... Plate for heat press, 11a ... Upper plate member,
11b, 22 ... Lower plate member, 12c, 22c ... Narrow pressure surface, 13 ... Sheet material, 17a, 17b ... Press board, 18
... Sheet laminate, 18a ... Side end, 18b ... Projection, 2
0, 25 ... Receiving recess, 23 ... Frame plate member, 23a ... Opening inner wall, C ... Card finished body, D ... Stacked thickness of sheet material, d ... Depth of receiving recess, G ... Gap (≈D-d ), S ... step.

Continued front page    F-term (reference) 2C005 HA06 JA26 KA02 KA61 LA03                       LA07 LA09 MA14 PA03 PA29                       RA04 RA09                 4E090 AA01 AB01 DA01 HA10                 5B035 AA08 BA05 BB02 BB09 CA03                       CA23

Claims (5)

[Claims] 1. A hot press plate comprising a pair of plate members having a narrow surface and thermocompressing a plurality of sheet materials that are collated and laminated, to produce a sheet laminate, wherein: An accommodating recess having a shape that is substantially the same as the sheet material and that has a depth dimension that is smaller than the thickness dimension of the sheet laminate and that has the same shape as the sheet material and that can accommodate the sheet material. A plate for heat pressing, which is provided with. 2. The accommodating recess is formed by a narrow pressure surface of the plate member and an inner wall of a frame plate member having a predetermined thickness attached to the narrow pressure surface of the plate member and having a central portion opened. The plate for hot pressing according to claim 1. 3. A hot pressing apparatus comprising a pair of plate members having a narrow pressure surface, wherein a plurality of sheet materials, which are collated and laminated, are thermocompression bonded to produce a sheet laminated body, wherein any one of the pair of plate members is used. On one of the narrow pressure surfaces, an accommodating recess having substantially the same shape as the sheet material and having a size capable of accommodating the sheet material and having a depth dimension smaller than the thickness dimension of the sheet laminate is provided. A heat press device characterized by being provided. 4. The accommodation recess is formed by a narrow pressure surface of the plate member and an inner wall of a frame plate member having a predetermined thickness attached to the narrow pressure surface of the plate member and having an opening at a central portion. The hot press device according to claim 3. 5. A sheet laminated body formed by thermocompression bonding a plurality of sheet materials, wherein a side end portion of the sheet laminated body immediately after thermocompression bonding has a step formed in the thickness direction. A sheet laminate.