JPS6018453B2 - Waste disposal equipment for thin-walled synthetic resin materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waste disposal apparatus for thin-walled synthetic resin articles, which cuts the shoulders of thin-walled articles such as synthetic resin bands or synthetic resin sheets.

Conventionally, this type of device rotates a cutter b having a cutting edge a, and cuts a shoulder d of a synthetic resin band or sheet fed between it and a fixed cutter c, as shown in Fig. 1. It is configured to cut.

Since the shoulder processing device with this configuration uses a mechanical cutting method, if the cutters b and c become overheated due to frictional heat generated during the cutting process, the so-called sharpness will deteriorate, so conventionally, the cutting atmosphere was The cutters b and c were prevented from overheating by cooling with a jacket, but this had the problem of increasing the size of the device and complicating the structure. Moreover, the cut scraps are charged with static electricity due to friction during the cutting process, and this charge causes them to adhere to the cutters b, c and the hopper e.

Since the scraps attached to the cutters b and c are further cut and turned over many times, the cut scraps become irregular in shape or are shredded into thread-like pieces, and become entangled with each other. This causes a problem that the exit of the hopper e, the screw conveyor g for conveying the cut shoulder to the retreading device f for retreading the cut shoulder into a pellet, etc. are likely to become clogged. In addition, when processing items of different materials or colors, previously cut chips and cotton dust generated during cutting may remain attached to the hopper e, screw conveyor g, etc. due to electrostatic charge. There is also the problem that cleaning must be done carefully to remove the particles, and so-called setup work takes a lot of time. An object of the present invention is to provide a waste disposal apparatus for thin-walled synthetic resin materials that can solve all of the above-mentioned conventional problems at once, and will be specifically explained below with reference to Examples.

First, in one embodiment shown in FIGS. 2 to 4, reference numeral 1 denotes a cutting mechanism, which is composed of a fixedly arranged pedestal 2 and a rotating cutter 3, and the circumferential outer surface 3a of the cutter 3 is a protrusion 4 is intermittently struck, and a heater 5 is buried in the protruding strip 4.

The pedestal 2 and the cutter 3 are arranged with a positional relationship such that the protrusion 4 substantially supports the upper surface of the pedestal 2 as the cutter 3 rotates, and the cutter 3 receives the circumferential outer surface 3a. It rotates while coming into contact with scraps of thin synthetic resin material that are fed between it and the table 2. The heater 5 directly heats the protruding part 4 and also heats the entire cutter 3 by heat conduction.As will become clear from the explanation below, the protruding part 4 acts as a thermal welding part, and the circumferential outer surface 3a of the cutter 3 acts as a heating part. On the other hand, a hopper 6 for receiving the cut shoulders is arranged below the cutting mechanism 1, and the calendar received by the hopper 6 is conveyed by a screw conveyor 7 to a reproducing device 8 for recycling it as pellets. Ru. The regenerating device 8 includes a heating device that heats and plasticizes the cut layer, a die mechanism that extrudes the plasticized resin into a rod shape, a cooling device that semi-cools the rod-shaped resin extruded, and a semi-cooled rod-shaped resin. It consists of a granulator that shreds resin into pellets. Next, the operation of the above mechanism will be explained by applying it to shoulder treatment of a synthetic resin band used for packing.

The heater 5 is energized to heat the cutter 3, and the band shoulder K is sent between the receiving base 2 and the cutter 3 while the cutter 3 is being rotated in the direction of the arrow J, as shown in FIG.
Then, the band calendar K is transferred in the direction of the arrow L while contacting the circumferential outer surface 3a of the cutter 3, and is cut into a predetermined short size by thermally cutting by the protrusion 4. By the way, when the band shoulder K is transferred in the direction of the arrow K while contacting the circumferential outer surface 3a of the cutter 3, only one side, that is, the upper surface, of the band calendar K is heated entirely by the circumferential outer surface 3a of the cutter 3.

On the other hand, synthetic resin strips for packing are stretched in the longitudinal direction, and their linear molecules are oriented in the stretching direction. The band calendar K of such a synthetic resin band is coated on one side (
When the upper surface) is heated, the linear molecules near the heated surface are disturbed in the width direction, and as a result, the heated surface side of the strip K contracts. As a result, the cut strip waste (hereinafter referred to as cutting calendar M) naturally winds up in a spiral shape so as to wrap the heating surface inward, and falls into the hobber 6 (see FIG. 4). According to this embodiment, the following excellent effects can be achieved.

01 Since the belt shoulder K is cut by thermal welding, there is no need to cool the cutter 3, unlike the conventional cutter which cuts it mechanically with a cutter having a cutting blade. It is surprising that there is no need to provide a cooling means, and the entire device can be made compact.

'21 Since it is a heat-fusion cutter, the belt shoulder K does not become charged with static electricity during the cutting process, and even if it does become charged, the static electricity disappears by heating, so the cutting shoulder M is cutter 3.
I don't want to get caught up in the process of getting it stuck and having to repeat it many times and get cut.

Therefore, problems such as the cutting shoulder M being cut into thread-like shapes do not occur at all, and the shape of the cutting shoulder M becomes uniform. '
31 As mentioned above, the shape of the cut waste M is uniform, and the cut layer M naturally winds in a spiral shape, so it has good transferability and is not recommended to clog the hopper 6, screw conveyor 7, etc. Not at all. ■ Also, there is no possibility that cotton dust-like dust is generated during cutting, and the cutting waste M is in an unelectrified state and will not adhere to the hopper 6 or screw conveyor 7, so it is possible to Cleaning can be done easily when processing items. ■ Moreover, since the cutting calendar M is wound in a spiral shape and has a shape similar to a cylindrical pellet, it is possible to use the cutting waste M itself as a pellet without making it into a pellet using the granulator 8. becomes.

'61 Furthermore, if the calendar of a stretched material such as a synthetic resin band for packaging is processed as in this embodiment, the cutting calendar M is wound in a spiral shape so that the heated surface by the circumferential outer surface 3a of the cutter 3 is on the inside. Therefore, even if the heating surface becomes molten, there will be no problem of the cutting shoulders M sticking together.

In the above embodiment, the circumferential outer surface 3a of the cutter 3 is configured to act as a heating part, but as shown in FIG. In this case, only the lower surface of the strap shoulder K is heated so that the circumferential outer surface 3a of the cutter 3 does not come into contact with the strap shoulder K.

Further, the receiving stand may be replaced by a roller 1 as shown in FIG. 6. In this case, the roller 10 is also provided with a heat-cutting part so that the band waste K is cut by melting from the upper and lower sides. It's okay. Next, FIG. 5 shows another embodiment of the cutting mechanism.The difference from FIG. It is located in section 13.

With this configuration, the cutting layer N has a cross-sectional shape and the thickness gradually decreases, so that the winding becomes stronger and the winding becomes smaller. Furthermore, when the melted part P protrudes during fusing by the thermal welding part 12 and is wound into a spiral, the melted part P is welded to the surface of the cutting waste N and seals the end, so there is no chance of the winding becoming loose. . In addition, when cutting a non-stretched thin material, the cutting shoulder is wound so that the heating surface side is extended and the heating surface is on the outside. For this reason, when the heating surface becomes molten, there is a problem that the cutting shoulders stick together, but to prevent this, for example, air can be blown out from a nozzle to cool the cutting shoulders. Other embodiments of the invention are described above and illustrated in the drawings. The present invention is not limited to the present invention, and various changes and modifications can be made without departing from the spirit thereof.

As explained above, the present invention does not require a cooling means for cooling the cutting mechanism, has a simple and compact structure, does not generate cotton dust during cutting, and is free from cutting waste. Since the hopper is not charged, it can be cleaned easily, and since the cutting shoulders are rounded and aligned in a cylindrical shape, there is no dust that could clog the hopper.
It has excellent effects such as being able to use the cut shoulder as it is as a pellet.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional waste disposal device, Figs. FIG. 4 is a schematic view of the cutting mechanism shown in different states for explaining the operation, and FIGS. 5 to 7 are schematic views showing other different embodiments of the cutting mechanism. In the figure, 1 is the cutting mechanism, 2 is the pedestal, 3 and 11 are the cutters, 3a is the outer circumferential surface of the cutter (heating part), and 4 is the protrusion part (
5 and 9 are heaters, 12 is a thermal melting portion, and 13 is a heating portion. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A cutting mechanism equipped with a cutter having a thermal fusing section for cutting off scraps of a thin synthetic resin material such as a synthetic resin band or a synthetic resin sheet is provided, and the cutting mechanism is provided with a heating section for heating the scraps. A waste disposal device for thin-walled synthetic resin articles, characterized by the following.