JPH0319046B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Field of Industrial Application The present invention relates to a centrifugal defoaming method and its device (hereinafter simply referred to as centrifugal defoaming method and its device) for eliminating air bubbles mixed in when filling resin into an LED display case, etc. . (b) Prior Art FIG. 1 is a perspective view showing an LED display, where 1 is a case and 2 is a display section. The inside of the case is filled with resin, but air bubbles may get mixed in during filling, which can cause problems such as blurring of the display. In order to eliminate the above-mentioned problems, a vacuum defoaming method has conventionally been used in which the resin-injected case is placed in a vacuum container. FIG. 2 is a perspective view showing a conventional vacuum defoaming device, in which 20 is a case, 21 is a tape, and 22 is a resin. The opening on the surface of the case 20 is closed with a tape 21, a resin 22 is injected, the case is placed in a vacuum container 10, and while looking at a vacuum gauge (not shown) connected to an arrow 12, a vacuum gauge (not shown) connected to an arrow 11 is connected to the case 20. A vacuum pump was used to increase the degree of vacuum in the vacuum container and remove air bubbles mixed in the injected resin 22. However, in this method, the degree of vacuum gradually increases, and the bubbles mixed in the resin expand accordingly, increasing their buoyancy and being expelled from the resin, so it depends on the capacity of the vacuum container. For example, a processing time of about 15 minutes was required. Also, this method is not suitable for mechanizing or automating the filling process, and although it is possible to process a large number of items at the same time, it is a batch process, so it is difficult to create a smooth production flow due to poor connections with the previous and subsequent production lines. The drawback was that I couldn't do it. (c) Purpose The present invention has been made in view of the above circumstances, and an object thereof is to provide a centrifugal defoaming method and an apparatus therefor that can perform defoaming treatment in a short time and can be inserted into a production line. (D) Structure The first invention rotates the case in a vertical plane after or while injecting the resin into the case, thereby applying centrifugal force to the resin, thereby reducing the amount of water contained in the resin. This is a centrifugal defoaming method that separates and eliminates air bubbles and fills with homogeneous resin.
The invention is an apparatus for carrying out the first invention, and this apparatus comprises a rotating drum that rotates with its main axis horizontal, a case magazine in which a case is placed, a resin pot filled with the resin, This centrifugal defoaming device is provided with a slide plate on which the resin pot is placed, and a guide mechanism for guiding the case magazine and slide plate on the outside and inside of the rotating drum. (E) Examples Examples of the first invention will be explained. First, the case is injected with resin and fixed to the inner periphery of a rotating drum so that it rotates in a vertical plane. In this case, the table on the next page shows the results of observing the bubble discharge status based on the difference in centrifugal force by varying the rotation speed. The experiment was conducted at room temperature and when heated to 70 degrees Celsius, but the results were better when heated.

[Table] Here, regarding bubbles, bubbles with a diameter of 0.05 mm or more are treated as bubbles, and regarding the centrifugal force applied to the sample, the value of acceleration based on rotational force is shown in G. It should be noted that similar results can be obtained whether the resin is injected into the case before the case is rotated or when the resin is injected into the case while the case is being rotated. Next, an embodiment of the second invention will be described.
FIG. 3 is a perspective view showing an embodiment of the second invention. In the figure, 100 is a rotating drum, 101 is a stay attached to both ends of the rotating drum 100, and 1
02 is a main shaft horizontally attached to the rotating drum 100, and the main shaft 102 rotates the rotating drum 100 by a rotation mechanism (not shown). Reference numeral 200 denotes a case into which resin is to be injected, and a plurality of cases 200 are placed at predetermined positions in the case magazine 300. Reference numeral 400 is a small cylindrical resin pot located at the upper part of the case 200 for injecting resin into the case 200, and this resin pot 400 is appropriately held by a slide plate 500. Resin is injected into the upper opening of the resin pot 400 from an appropriate dispenser (not shown, but symbolically indicated by arrow D in FIG. 3). Therefore, the guide mechanism for guiding the case magazine 300 and slide plate 500 into the rotating drum 100 consists of a case magazine guide rail 601 provided outside the rotating drum 100, a slide plate guide rail 602, and a guide mechanism for guiding the case magazine 300 and the slide plate 500 into the rotating drum 100. Case magazine guide rail 603 provided inside and slide plate guide rail 6
Contains 04. That is, the case magazine guide rail 601
is fixed to the outside of the rotating drum 100 along the axial direction thereof. Furthermore, a case magazine guide rail 603 is provided inside the rotating drum 100 along its axial direction. On the other hand, hold the slide plate 500 and move it onto the rotating drum 1.
A slide plate guide rail 602 that guides the inside of the rotary drum 100 is provided outside the rotary drum 100, and a slide plate guide rail 604 is suspended from, for example, the stay 101 inside the rotary drum 100. The case magazine guide rails 601 and 603 are connected to each other to move the case magazine 300, and the slide plate guide rails 602 and 604 are connected to each other to move the slide plate 500 to the rotating drum 1.
It is configured so that it can be sent and received inside the 00. Next, the operation of the embodiment having the above-described configuration will be explained. First, the case magazine 300 is set at a predetermined position on the case magazine guide rail 601 (the left end of the case magazine guide rail 601 in FIG. 3), and a required number of cases 200 are placed on the case magazine 300. Also, slide plate 5
00 is the same, slide plate guide rail 60
2 (at the left end of the slide plate guide rail 602 in FIG. 3), and a required number of resin pots 400 are placed thereon. The diameter of the tip of the resin pot 400 can be determined to prevent the resin from falling when no centrifugal force is applied, and to allow the resin to be poured into the resin case 200 when centrifugal force is applied. Now, an appropriate amount of resin is injected into the resin pot 400 from a dispenser (not shown). After the resin is injected, the case magazine 300 and slide plate 500 are driven in synchronization with each other in the directions of arrows A and B by a drive device (not shown), and are guided and inserted into the case magazine guide rail 603 and the slide plate guide rail 604. Case magazine 300, slide plate 50
0 is guided and inserted, the rotating drum 100 begins to rotate, and based on this rotation, a required centrifugal force is applied to the resin in the resin pot 400, the resin that is being injected into the case 200, and the air bubbles in the resin. It will be done. That is, the centrifugal force applied in this case is determined in relation to the viscosity of the resin and the diameter of the tip of the resin pot 400, but since the resin can be gradually injected while the centrifugal force is acting, the resin It is possible to eliminate the overflow. After the required amount of resin is injected into the case 200, the rotating drum 100 is stopped so that the case 200 stops at the lower fixed position of the rotating drum 100,
Next, the slide plate 500 is pulled out in the opposite direction to the direction of arrow B, while the case magazine 300 is pulled out to the right end side of the rotating drum 100, and the case 200 moves to the resin drying process. In the above embodiment, the resin is injected using the centrifugal force generated by the rotation of the rotary drum 100 while the rotary drum 100 is rotating, but in another embodiment, the resin is injected into the case 200 from the resin pot 400. Afterwards, it is also possible to rotate the rotary drum solely for the purpose of defoaming. In this case, slide plate 50
0 is not inserted into the rotating drum 100,
It will remain in its original position. However, in this case, the resin is injected from the dispenser into the resin pot while being pressurized. (f) Effects According to the method and apparatus according to the present invention, since the weights of the resin and the bubbles are different from each other, both are subjected to centrifugal forces of different magnitudes. Therefore, by rotating the case, air bubbles can be efficiently separated and discharged from the resin. That is, the method and apparatus according to the present invention
When injecting and filling resin into cases such as LED displays, the process time is about 1/60 that of the conventional vacuum defoaming method mentioned above, which is a short time of about 15 seconds. It is possible to mechanize and automate the resin filling process without disturbing the flow.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an LED display, FIG. 2 is a perspective view of a vacuum defoaming device, and FIG. 3 is a perspective view of a centrifugal defoaming device according to the present invention. 100... Rotating drum, 200... Case, 3
00...Case magazine, 400...Resin pot, 500...Slide plate, 601,60
3...Case magazine guide rail, 602,6
04...Slide plate guide rail.

Claims (1)

[Claims] 1. After or while injecting resin into a case, by rotating the case in a vertical plane, a centrifugal force is applied to the resin, and air bubbles contained in the resin are removed. A centrifugal defoaming method used when filling LED resin, which is characterized by separating and eliminating the resin before filling the resin. 2. A rotating drum that rotates with its main shaft horizontal, a case magazine on which a case is placed, a resin pot for filling the case with resin, a slide plate on which the resin pot is placed, and the case magazine and slide plate. A centrifugal defoaming device used for LED resin filling, characterized in that guide mechanisms for guiding are provided on the outside and inside of the rotating drum.