JPH0471662A - Production of sheet for electronic parts transferring body - Google Patents

Abstract

PURPOSE:To prevent charging with static electricity by applying electrically conductive ink to the surface of a base sheet by a reverse applying method. CONSTITUTION:A base sheet 20 of polypropylene is passed between an applicator roll 23 and a backup roll 25 and electrically conductive ink 22 is applied to the underside of the sheet 20 by a reverse applying method. Since the ink 22 can be rubbed on the sheet 20 under pressure from the roll 23 side, carbon in the ink 22 is surely dispersed on the sheet 20, the surface resistance of the sheet 20 can be uniformly reduced and charging with static electricity can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of manufacturing a sheet plate for an electronic component carrier for packaging and transporting electronic components such as ICs.

(Prior Art) Conventionally, electronic component carriers made of synthetic resin are known that package and transport a large number of electronic components such as ICs.

This electronic component carrier includes a bottom material that accommodates electronic components such as ICs, and a flat lid material that covers the bottom material. Among these, the bottom material consists of a container part for storing electronic components and a flange part opening at the upper end of the container part, and the lid material is heat-sealed to this flange part. Furthermore, a large number of container sections are provided in series so that a large number of electronic components can be packaged.
Each container part is connected by a flange part at the upper end opening of the container part.

In the electronic component carrier having such a configuration, the IC
etc. are stored in each container part of the bottom material, and then
A flat lid material is heat-sealed to the flange portion of the bottom material to package electronic components.

(Problems to be Solved by the Invention) As described above, the bottom material that houses electronic components such as ICs is composed of a continuous container section and a flange section that connects each container section. Further, the bottom material is generally formed by vacuum forming a synthetic resin sheet plate.

By the way, such a sheet plate for an electronic component carrier is
Manufactured by applying conductive ink to the surface of synthetic wood material.

The reason why sheet plates are manufactured by applying conductive ink to the original fabric in this way is to reduce the surface resistance value of the electronic component carrier and prevent static electricity from being charged.

However, when conventional gravure printing methods are used to manufacture sheet plates by applying conductive ink to a raw material, there are many microscopic irregularities, and in order to obtain the desired surface resistance value, it is necessary to apply two coats of paper. Painting was necessary. For this reason, the work is time-consuming and the amount of ink used is high, resulting in high costs.

The present invention has been made with these points in mind.
It is an object of the present invention to provide a method for manufacturing a sheet plate for an electronic component carrier, which can reliably prevent static electricity charging.

[Structure of the invention]

(Means for Solving the Problems) The present invention is directed to the production of a sheet plate for an electronic component carrier, which manufactures a sheet plate for an electronic component carrier by applying conductive ink containing carbon to the surface of a synthetic resin original fabric. A method for manufacturing a sheet plate for an electronic component carrier, characterized in that a conductive ink is applied to the surface of the original fabric by a reverse coating method.

(Function) According to the present invention, since the conductive ink is applied to the original fabric by the reverse coating method, the conductive ink can be applied by rubbing without applying pressure. It can be reliably dispersed in the opposite direction.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1 to 7 are diagrams showing an embodiment of a method for manufacturing a bottom material for an electronic component carrier according to the present invention. Of these, Fig. 1 shows the conductive ink coating device, Fig. 2 shows the bottom material manufacturing device, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 shows the sheet plate. A diagram showing the heating area, FIG. 5 is a perspective view showing the electronic component carrier, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG.
FIG. 7 is a diagram showing the relationship between dilution rate and viscosity of conductive ink.

First, the electronic component carrier will be explained. In FIGS. 5 and 6, the electronic component carrier 10 includes a bottom case 11 for storing electronic components 17 such as ICs, and a cover material 1 that covers the bottom material 11.
5. The bottom material 11 is made up of a container section 12 for storing electronic components and a flange section 13 at the top opening of the container section 12, and the lid material 15 is heat-sealed to this flange section 13. A large number of container parts 12 are provided in succession so that a large number of electronic components 17 can be stored.
Each container part 12 is connected to each other by a flange part 13 having an opening at the upper end. Of these, the bottom material 11 is formed by vacuum forming a sheet plate made of polypropylene, for example, while the lid material is made of a laminated sheet plate made of synthetic resin.

Next, a method of manufacturing a sheet plate used for the bottom material will be explained with reference to FIG.

The sheet plate is manufactured by applying conductive ink to the surface of the original fabric, or as shown in FIG.
Applicator roll 2 that applies conductive ink to the original fabric 20
3.

Further, the original fabric 20 is pressed against the applicator roll 23 by a backup roll 25 arranged above the applicator roll 23.

Also, within the storage container 21, the applicator roll 23
A metering roll 24 is disposed on the side of the metering roll 24 .

The applicator roll 23 rotates in the opposite direction at its contact point with respect to the running direction of the web 20, and such a coating method is called a reverse coating method.

The rolls 23, 24, 25 are independently driven to change their speeds, and the applicator roll 23 is fixed in position. Further, the relative positions of both the metering roll 24 and the backup roll 25 with respect to the applicator roll 23 can be adjusted.

The material of the metal ring roll 24 is made by grinding the surface of a chilled casting or steel pipe, plating it with hard chrome, and then finishing it by grinding.

The backup roll 25 has synthetic rubber (NBR, E
FT, butyl rubber, silicone rubber, etc.) is lined, and the rubber hardness varies depending on the raw material 20, and is usually HS-
It is 60/75°.

The coating thickness is determined by the size of the gap between the rolls 2B and 24.degree. 25 that are in contact with each other, the circumferential speed ratio of each roll 23 and 24.degree. 25, the ink viscosity, and the like.

Next, an apparatus for manufacturing a bottom material from a sheet plate formed by applying conductive ink to an original fabric will be explained with reference to FIGS. 2 to 4.

In FIG. 2, the bottom material manufacturing apparatus 1 is configured by sequentially arranging an adjusting roller 2, a heating device 3, and a vacuum forming device 4, and is configured to vacuum form a sheet plate 5 made of synthetic resin, for example, polypropylene. It has become.

Among these, the vacuum forming device 4 includes a female mold 4a and a female mold 4.
a and a male mold 4b which sandwiches the sheet plate 5 between them.

Further, as shown in FIGS. 2 and 3, the heating device 3 includes a lower heater 3a and an upper heater 3b, and sheet plates 5 are provided on both sides of the lower heater 3a and the upper heater 3b.
A pair of sheet holding devices 6 hold the sheet plate 5 to be heated along the traveling direction from both sides, and a cooling water pipe 7 is provided inside each sheet holding device 6. ing.

Next, the operation of this embodiment having such a configuration will be explained.

Generally, conductive ink contains carbon, a solvent, a binder, etc., and first, conductive ink 22 having a carbon/binder weight ratio of 20/80 is prepared.

Next, in FIG. 1, a polypropylene original fabric 20 is passed between an applicator roll 23 and a backup roll 25, and in this way, conductive ink 2 is applied to the lower surface of the original fabric 20.
．． Apply 2.

In this case, since the conductive ink 22 is applied to the web 20 by the reverse application blade as described above, the conductive ink can be applied by rubbing while applying pressure to the conductive ink from the applicator roll 23 side.

Therefore, the carbon in the conductive ink 22 is reliably dispersed on the original fabric 20, so that the surface resistance value can be reduced uniformly with little unevenness. Moreover, the surface of the original fabric 20 can be made rough (increase the surface area) by dispersing carbon, thereby increasing the beer strength of the lid material 15 with respect to the bottom material 11 as described later.

In this way, the polypropylene sheet plate 5 is manufactured. Next, a method for manufacturing the bottom material 11 from the polypropylene sheet plate 5 will be explained with reference to FIGS. 2 to 4.

A polypropylene sheet plate 5 is supplied from the adjusting roller 2 to a heating device 3 and heated by this heating device 3. In this case, the lower heater 3a and upper heater 3b of the heating device 3
Since the heating portion (not shown) is provided intermittently in the traveling direction, a plurality of non-heated regions 9a are formed at predetermined intervals on the heated sheet plate 5 in a direction perpendicular to the traveling direction. .

In addition, non-heated regions 9b are also formed on both sides of the sheet plate 5 along the traveling direction by the sheet holding device 6. That is, since the cooling water pipe 7 is provided in the sheet holding device 6, the sheet plate 5 is
Both side portions of are cooled to form non-heated regions 9b. A heating region 8 is formed between these non-heating regions 9a and 9b.

Subsequently, the sheet plate 5 is sent to a vacuum forming device 4 consisting of a female die 4a and a male die 4b, where the sheet plate 5 is heated in a heating area 8.
is vacuum formed to form the bottom material 11, and then rolled up.

Next, this bottom plate 11 is supplied to a taping machine, the electronic components 17 are stored in the container part 12 of this bottom material 11, and the lid material 15 is heat-sealed to the flange part 13 to obtain the electronic component carrier 10. (Figures 5 and 6).

Concrete example Next, specific examples of the present invention will be described.

First, a conductive ink having a carbon/binder weight ratio of 20/80 was prepared, and the conductive ink was applied to a polypropylene original fabric by a reverse coating method to a coating thickness of 1 to 2 μm to produce a sheet plate.

Note that, as described above, the conductive ink contains carbon, a solvent, and a binder.

Here, FIG. 7 shows the relationship between dilution rate with solvent and viscosity. As shown in FIG. 7, when the dilution rate is 20% to 50%, the viscosity is relatively stable, so a conductive ink with a dilution rate of 20% to 50% with a solvent was used.

Next, a bottom material was manufactured from this sheet board by the above manufacturing method, electronic components were further stored in the container part of the bottom material, and a lid material was heat-sealed to the flange part of the bottom material to obtain an electronic component carrier. .

Comparative Example Next, as a comparative example, a sheet plate was manufactured by applying conductive ink to a polypropylene original fabric by a normal rotation coating method (a coating method in which an applicator roll rotates in the normal rotation with respect to the running direction of the original fabric). Next, a bottom material was manufactured from this sheet plate, electronic components were further housed in the container portion of the bottom material, and a lid material was heat-sealed to the flange portion of the bottom material. Otherwise, an electronic component carrier was obtained in the same manner as in the specific example.

Next, for these specific examples and comparative examples, a peeling test of the lid material from the bottom material and a test regarding the surface resistance of the bottom material were conducted. The results are shown in Table-1 and Table-2, respectively.

Table-1 Peel strength (peel angle 180” at 300 mm/1 lin peel) Table-2
Surface Resistance of Bottom Material As shown in Tables 1 and 2, according to the present invention, carbon can be dispersed on the surface of the original fabric by applying conductive ink to the original fabric using a reverse coating method.

This not only increases the peel strength but also reduces the surface resistance of the bottom material and improves the antistatic effect.

In the above specific example, an example was shown in which a conductive ink with a carbon/binder weight ratio of 20/80 was prepared, but the above specific example also applies when a conductive ink with a weight ratio of 18/82 to 22/72 is used. Results similar to those in the example were obtained.

Further, although the apparatus shown in FIG. 1 has been described as a conductive ink coating apparatus, the present invention is not limited to this, and for example, an apparatus shown in FIG. 8 may be used.

In FIG. 8, a backup roll 25 is arranged on the side of the applicator roll 23, and the applicator roll 2
A metering roll 24 is arranged above the metal ring 3. Further, conductive ink 22 is introduced between the applicator roll 23 and the metering roll 24.

〔Effect of the invention〕

As explained above, according to the present invention, the carbon in the conductive ink can be reliably and evenly dispersed on the original fabric, thereby uniformly reducing the surface resistance value and improving the antistatic effect. I can do it. Further, the dispersion of carbon can make the surface of the original fabric rough, and the beer strength of the lid material relative to the bottom material manufactured from the sheet board can be increased.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conductive ink coating device according to the present invention;
Fig. 2 is a diagram showing a bottom material manufacturing device for an electronic component carrier, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is a plan view showing the sheet plate after heating. , FIG. 5 is a partial perspective view of the electronic component carrier, FIG. 6 is a sectional view taken along the line VI-Vl in FIG. 5, and FIG. 7 is a diagram showing the relationship between the dilution rate and viscosity of the conductive ink.
FIG. 8 is a diagram showing another coating device for conductive ink. DESCRIPTION OF SYMBOLS 1... Bottom material manufacturing device, 3... Heating device, 4... Vacuum forming device, 5... Sheet plate, 6... Sheet holding device, 7... Cooling water piping, 8...・Heating area, 9a, 9
b... Non-heating area, 10... Electronic component carrier, 11
... Bottom material, 12 ... Container part, 13 ... Flange part, 15 ... Lid material, 20 ... Original fabric, 21 ... Storage container, 22 ... Conductive ink, 23. ...Applicator roll, 24...Metaling roll, 25...Backup roll.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a sheet plate for an electronic component carrier, which manufactures a sheet plate for an electronic component carrier by applying a carbon-containing conductive ink to the surface of a synthetic resin raw material. A method for manufacturing a sheet plate for an electronic component carrier, characterized in that conductive ink is applied to the opposite surface by a reverse coating method. 2. Carbon content is 18/8 in carbon/binder ratio
2. The method of manufacturing a sheet plate for an electronic component carrier according to claim 1, wherein a conductive ink of 2 to 22/78 is prepared and this conductive ink is applied to the surface of the original fabric by a reverse coating method.