JPH0736727Y2 - Resin tablet heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a resin tablet heating device for preheating a resin tablet when, for example, resin molding an electronic device.

(Prior Art) When resin-molding an electronic device, for example, by a transfer mold press machine, a resin tablet is heated in advance rapidly and uniformly by dielectric heating and supplied to a pot of a mold of the transfer mold press machine.

An example of a heating device used for heating this resin tablet is shown in FIGS. 5 and 6.

In FIG. 5 and FIG. 6, the lower electrode for dielectric heating comprises a pair of roller-shaped electrodes 1,1 and an upper electrode 2 is provided above the pair of roller-shaped electrodes 1,1.

A plurality of flat circular resin tablets 3 are placed on the pair of roller-shaped electrodes 1,1.
When a high frequency voltage is applied between the upper electrode 2 and the upper electrode 2, the resin tablet 3 is heated by dielectric heating. In this case, one roller-shaped electrode 1 is rotated by a helical gear 4 driven by a motor (not shown), and the resin tablet 3 is rotated by the rotation of the roller-shaped electrode 1. The other roller-shaped electrode 1 is a resin tablet 3
Rotates with the rotation of. Therefore, the resin tablet 3 is adapted to be dielectrically heated while rotating on the roller-shaped electrodes 1,1. During this heating, the temperature of the resin tablet 3 is detected by the infrared temperature sensor 5, and the output signal of the infrared temperature sensor 5 is given to the temperature control circuit 6. Then, the temperature control circuit 6 gives a control signal according to the output of the infrared temperature sensor 5 to the voltage adjuster 7, whereby a pair of roller-shaped electrodes 1, 1 and an upper electrode 2 are provided according to the temperature of the resin tablet 3.
Automatically adjust the voltage applied between
The heating is controlled to a set temperature.

(Problems to be solved by the invention) However, in the above configuration, when the resin tablet 3 is rotated on the pair of roller-shaped electrodes 1, 1, the resin tablet 3 is slightly conical depending on its shape. Then, the resin tablet 3 gradually shifts laterally on the pair of roller-shaped electrodes 1, 1 and the distance between the resin tablet 3 and other resin tablets 3 becomes shorter or longer.

When the distance between the resin tablets 3 is different in this way, the temperature of the resin tablets 3 varies as shown in the following table.

Generally, resin tablets differ depending on the type of resin,
Heat to 75 ± 2 ° C to 100 ± 2 ° C. When the temperature error exceeds ± 2 ° C, when the resin tablet is put in the pot of the mold of the transfer mold press machine and the resin tablet is melted and filled in the cavity, the resin is not filled in the cavity or the filling speed is increased. It causes problems such as inconsistency.

However, the error of the infrared temperature sensor 5 is already about ± 2 ° C., and if a temperature error occurs due to the variation in the distance between the resin tablets 3 on top of that, the allowable error range of ± 2 ° C. is exceeded, and unfilled, Problems such as inconsistent filling speeds become a reality.

As one of the solutions, Japanese Utility Model Publication No. 1-162238 has been published. This is to prevent variation in the distance between the resin tablets by using a material supplying jig having a structure for partitioning the resin tablets. But,
This feeding jig is for arranging the resin tablets on the rollers. If the resin tablets arranged on the rollers have a slightly conical shape, they will move during rotation on the rollers. Cannot solve the problem.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a large variation in the distance between resin tablets and to prevent a variation in the heating temperature of the resin tablets due to this. To provide the equipment.

[Means for Solving the Problems] (Means for Solving the Problems) A heating device for a resin tablet according to the present invention is one in which a plurality of resin tablets are arranged on a roller and dielectric heating is performed while rotating the resin tablet by the roller. The present invention is characterized in that a space regulating portion for regulating the space between the resin tablets on the roller to a certain range is provided.

(Function) Since the gap regulation part that regulates the gap between the resin tablets within a certain range is provided, there is no fear that the gap between the resin tablets will become abnormally wide or narrow, and there will be multiple gaps. The resin tablets of can be heated to the set temperature without large variations.

(Embodiment) A position embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The lower electrode for heating the resin tablet 11 by the dielectric heating method is composed of a pair of roller-shaped electrodes 12 and 12 as rollers, and both roller-shaped electrodes 12 and 12 are rotatably supported by support members 13 and 13. And both roller-shaped electrodes 1
Flat circular resin tablets 11 to be heated on 2,12
Are arranged side by side, for example, three pieces are arranged side by side.

One of the roller-shaped electrodes 12 and 12 is one roller-shaped electrode 1.
2 has a tooth 12a of a helical gear partially formed on this tooth.
Helical gear 14 driven by a motor not shown in 12a
Are in mesh. Therefore, when the helical gear 14 is rotated by a motor (not shown), the rotation is transmitted to one roller-shaped electrode 12, and the resin tablet 11 is rotated on the pair of roller-shaped electrodes 12, 12. There is. The other roller-shaped electrode 12 rotates as the resin tablet 11 rotates.

Further, the upper electrode 15 for dielectric heating is arranged above the pair of roller-shaped electrodes 12, 12, and the upper electrode 15 and the pair of roller-shaped electrodes 12, 12 are connected to the high frequency voltage from the voltage regulator 16. Is applied.

On the other hand, the temperature of the resin tablet 11 during dielectric heating is detected by the infrared temperature sensor 17, and the output signal of the infrared temperature sensor 17 is given to the temperature control circuit 18. Then, the temperature control circuit 18 gives a control signal according to the output of the infrared temperature sensor 17 to the voltage adjuster 16, so that between the pair of roller-shaped electrodes 12, 12 and the upper electrode 15 depending on the temperature of the resin tablet 11. The voltage applied to is automatically adjusted, and the resin tablet 11 is heated and controlled to a set temperature.

Thus, the bar 19 is arranged between the pair of roller-shaped electrodes 12, 12. Further, four restriction plates 20 as interval restriction parts are attached to the bar 19, and the resin tablets 11 are set between the restriction plates 20. The regulation plate 20 is slidable with respect to the bar 19 and its mounting position can be changed depending on the size of the resin tablet 11. Then, the restriction plate 20 is fixed to the bar 19 by tightening a substantially C-shaped fitting portion 20a fitted to the bar 19 with the screw 21 to the bar 19.

Next, the operation of the above configuration will be described.

First, the three resin tablets 11 are connected to the pair of roller-shaped electrodes 12,1.
2 Set on top. In this case, the resin tablet 11 is set so as to be located between the regulation plates 20.

After that, one of the roller-shaped electrodes 12 is driven to rotate, and a high frequency voltage is applied between the pair of roller-shaped electrodes 12 and 12 and the upper electrode 15 via the voltage adjuster 16. Then, the resin tablet 11 is heated by dielectric heating while rotating on the roller-shaped electrode 12. At this time, the temperature of the resin tablet 11 is detected by the infrared temperature sensor 17, and the voltage regulator 16 automatically adjusts the output voltage according to the temperature of the resin tablet 11, so that the resin tablet 11 reaches the set temperature. It is to be heated automatically.

Now, at the time of heating as described above, the resin tablet 11
If the shape of, for example, is conical, resin tablets
11 moves laterally on the pair of roller-shaped electrodes 12, 12.
However, the regulation plates 20 are provided on both sides of each resin tablet 11.
Therefore, the resin tablet 11 is restricted by the regulation plate 20.
It moves until it touches, but it does not move any further. For this reason, the gap between the resin tablets 11 does not become abnormally wide or narrow and falls within a certain range. Therefore, unlike the conventional case, there is no possibility that the gap between the resin tablets 11 greatly varies and the heating temperature also varies greatly, and the temperature is within a certain allowable temperature range.

Therefore, when the resin tablet 11 after heating is supplied to the pot of the mold of the transfer mold press machine and the resin tablet is melted to fill the cavity, the resin is not filled in the cavity or the filling speed is not constant. There is no possibility of causing the problem.

3 and 4 show another embodiment of the present invention. The difference from the above-mentioned one embodiment is that the regulating plate 21 is provided on the upper electrode 15. Even in this case, the same effect as that of the above-described embodiment can be obtained.

Note that a plurality of large-diameter portions may be formed on the bar 19, and the large-diameter portions may be used as the interval regulating portion.

[Advantage of the Invention] According to the present invention described above, the gap between the resin tablets on the roller is abnormally widened due to the provision of the gap regulating portion for regulating the gap between the resin tablets within a certain range. , There is no danger of becoming abnormally narrow. Therefore, the distance between the resin tablets can be prevented from being greatly varied, and the variation in the heating temperature of the resin tablets due to this can be prevented, and the plurality of resin tablets can be heated from the set temperature without being largely varied. It has an excellent effect.

[Brief description of drawings]

1 and 2 are a front view and a side view showing an embodiment of the present invention, and FIGS. 3 and 4 are another embodiment of the present invention, which are equivalent to FIGS. 1 and 2, and FIG. FIGS. 5 and 6 are equivalent to FIGS. 1 and 2 showing a conventional example. In the figure, 11 is a resin tablet, 12 is a roller-shaped electrode (roller), 15 is an upper electrode, 17 is an infrared temperature sensor, 20 and
Reference numeral 21 is a regulation plate (regulation member).

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Claims (1)

[Scope of utility model registration request] 1. A plurality of resin tablets are arranged on a roller,
What is claimed is: 1. A heating device for a resin tablet, comprising: a device for performing dielectric heating while rotating the resin tablet by means of a roller, wherein a space regulating portion for regulating a space between the resin tablets on the roller within a certain range is provided.