JP2001347543A - Apparatus and method for preventing plastic molding purge material from melt-stacking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a purge material from becoming a large lump in a purge process without causing a decrease of an operation efficiency and a danger of burn. SOLUTION: A molten purge material is moved by a centrifugal force so that the molten purge material does not remain at one position whereby the purge material is prevented from becoming a large lump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic molding purge material for purifying a plastic molding device having a plastic plasticizing device so that the purge material can be easily recycled by making the size and shape of the purge material easy to grind. The present invention relates to a fusing device and a control method thereof.

[0002]

2. Description of the Related Art The structure of a conventional plastic molding apparatus is shown in FIG.

[0003] In general, in plastic molding, when a material is changed or when molding is interrupted, the molding material is forcibly discharged in order to make the resin 7 in the cylinder uniform and prevent thermal decomposition.
(Called purging). Material discharged at this time (purge material)
Are continuously discharged to the same place in a molten state on the fixed tray 12. For this reason, the purge material is cooled and solidified at one location on the tray 12 to form a large lump 13.

[0004]

In general, when plastic waste such as a purge material is subjected to chemical recycling (chemically treated as a raw material for chemical products) or thermal recycling (burned and used as a heat source). It is used after being finely ground as a pretreatment. However, since the purge material becomes a large lump as in the above-described conventional technology, the pulverization becomes extremely difficult, and this is an issue for each recycling.

Therefore, in order to recycle the purge material, it was necessary to manually separate the high-temperature molten purge material into small portions. However, in this operation, there is a problem that the operation efficiency is deteriorated, and there is a possibility of a burn due to a high temperature of the molten purge material.

[0006]

According to the present invention for solving the above-mentioned problems, a rotary tray is provided at a position where the purge material is discharged, and the molten purge material is removed by centrifugal force generated by rotation of the tray. By moving the purge material in the outer circumferential direction of the tray, it is possible to prevent the purge material from being stacked and solidified to form a large lump.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view showing the state of a rotary tray, a molding machine cylinder, and a purge material when the tray of the present invention is used. FIG. 2 is a diagram of the present configuration as viewed from above.

Tray 1 having an outer wall 14 provided on a circular plate
And a motor 2 which is a rotating means connected to the tray 1. The tray 1 is rotatably supported by the motor 2. The tray 1 is installed below a molding machine nozzle 3 which is a material discharge port. According to such a configuration, the molten material 7 in the cylinder 6 discharged by the movement of the molding machine plunger 4 (purge material discharge track 5) is discharged to a position slightly off the rotating shaft 8 of the motor 2 (this The discharged material is the purge material 9), and the centrifugal force 10 is generated by the rotation of the tray 1, and the centrifugal force 10 causes the purge material 9 to flow.
Moves to the outer periphery of the tray. Since the falling point of the purge material 9 is discharged to a position deviated from the rotation shaft 8 of the tray 1, the falling point of the purge material 9 varies depending on the rotation of the tray 1, and each time the centrifugal force 10 Tray 1
Transported to the outer periphery. Therefore, the purge material 9 is divided into small pieces. For this reason, it is possible to prevent the solidification by stacking on the tray 1. Tray 1
The outer wall 14 is provided on the outer periphery of the tray 1 to prevent the purge material 9 from being blown out of the tray 1 by the centrifugal force 10.

The material of the tray 1 includes iron, aluminum, plastic and the like. Regardless of which material is used, the surface of the surface is subjected to Teflon (registered trademark) treatment to facilitate movement of the small purge material and prevent the tray 1 and the purge material 9 from sticking.

The size of the tray 1 is proportional to the size of the plasticizing device of the molding device. When the plasticizing cylinder volume is 100 cc, the diameter of the tray 1 is suitably 250 mm to 600 mm.

The rotation of the tray 1 even if it is not circular has the effect of preventing the solidification of the lamination. However, by making the tray 1 circular, the purge material 9 separated by centrifugal force has substantially the same size. be able to.

Further, by providing the wind vent window 11 on the outer wall 14 of the rotating tray 1, the cooling of the plastic molding purge material can be accelerated. This is because, when the tray 1 rotates, the wind is generated in the tray 1 from the wind window 11 toward the center of the tray, whereby the cooling of the purge material 9 in the tray 1 can be accelerated.

Although there may be only one wind window, it is preferable to provide a plurality of wind windows in order to cool the purge material 9 uniformly and more quickly. Furthermore, a greater effect can be obtained by providing a plurality of wind window windows symmetrically with respect to the rotation axis 8.

Further, by controlling the number of rotations of the motor 2 and the moving speed of the plunger 4 of the molding machine by control means (not shown), it is possible to obtain the size and shape of the purge material suitable for use in a crusher (not shown). . Specifically, when the moving speed of the plunger 4 is constant at a low speed and the number of rotations of the motor 2 is constant at a low speed, the purge material has a thin spiral shape. For example, when the plunger movement speed is 10 mm / s and the tray rotation speed is 20 rpm, the purge material has a thin spiral shape.

Further, once the rotation of the motor 2 is stopped, the plunger 4 is advanced to discharge the purge material to some extent, and after the purge material has a suitable size, the motor 2 is rotated to remove the small purge material. By continuously performing the moving step, the separation processing can be performed on the small-sized purge material. As an example of the control means, there is a general electric control circuit equipped with a CPU or the like.

[0017]

According to the present invention, it is possible to efficiently and safely perform the subdivision operation of the purge material for the purpose of crushing the purge material.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for infusing plastic molding purge material according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the configuration of FIG. 1 as viewed from above.

FIG. 3 is a schematic view showing a state of a fixed tray, a molding machine cylinder, and a stacked purge material according to a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tray, 2 ... Motor, 3 ... Molding machine nozzle, 4 ... Molding machine plunger, 5 ... Track of discharge purge material, 6 ... Molding machine cylinder, 7 ... Molten resin in cylinder, 8 ... Rotation axis of motor 2, 9 ... Purge material, 10 ... Centrifugal force, 11 ... Wind window provided on the outer wall of tray 1, 12 ... Fixed tray, 1
3 ... Laminated purge material state when a fixed tray is used, 14 ... Outer wall.

Claims (3)

[Claims] A tray is provided at a lower portion of a purge material discharge port of a plastic molding machine, an outer wall is provided at an outer peripheral portion of the tray, and the tray is provided to move a purge material discharged onto the tray by centrifugal force to the outer peripheral portion of the tray. A device for infusing a plastic molding purge material, characterized in that a rotating means for rotating the plastic is provided. 2. An apparatus for infusing plastic molding purging material according to claim 1, wherein a wind window for blowing air to the purging material is provided on an outer wall of the tray. 3. The method according to claim 1, wherein the number of rotations of the tray is linked to the purge speed of the molding machine.