JP2853958B2 - Granulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously granulating resin sheets, films and molded articles, and more particularly, to a method for continuously granulating resin sheets, films and scrap molded articles without using screws. The present invention relates to a granulator for extrusion granulation.

[0002]

2. Description of the Related Art Conventionally, when a resin film is processed and both ends of the film are cut and the dimensions thereof are made uniform, waste called Mimi is generated. Granulation is performed, and furthermore, a method such as crushing and granulating the scrap to reuse the molded product scrap is performed. As such a conventional granulation method, a method of performing extrusion granulation using a single-screw or multi-screw screw, a method of granulating by a sheet cutter, a crusher, or the like are known.

[0003]

However, in the method of granulating using a conventional screw, the equipment cost of a granulating apparatus such as an extruder is expensive, and the production efficiency is high when a large number of kinds and small quantities are produced. Are bad. In addition, the extrusion granulation apparatus using a screw also has a problem that it is not possible to obtain a uniformly kneaded resin due to partial heat generation and uneven shearing force between the barrel and the screw. Further, the method of granulating with a sheet cutter or a crusher has problems such as loud noise, poor pellet shape, and poor productivity.

A rotatable support that does not have these problems.
Cylindrical die with a large number of holes on the outer surface
And a pressing member provided close to the outer peripheral surface of the cylindrical die.
A pressure member, and a resin material supplied between the pressure member and the die.
To push the material into the many holes in the die.
A pressure member and the pressing member presses the inside of the die.
In order to cut the extruded resin,
Granulators comprising fixed blades are also known.
(See JP-A-53-90370). But
However, in these granulators, a cylindrical die is used.
There is a space between the holes to be drilled, the outer peripheral surface of the die,
In particular, the resin material stays between the holes, causing the phenomenon of resin burning.
May be seen. Accordingly, an object of the present invention is to improve such a conventional granulation apparatus so that the production of resin without burning can be improved.
An object of the present invention is to provide an efficient granulation apparatus.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a cylindrical die which is rotatably supported and has a large number of holes formed on an outer peripheral surface thereof, and an outer peripheral surface of the cylindrical die. And a flat resin material which is heated by a heating device supplied between the dies and is given flexibility and is pressed into a large number of holes provided in the dies. In a granulating apparatus comprising a pressing member for fixing the resin extruded into the die by the pressing member, the large number of holes are formed by a fixed blade provided inside the die. The hole diameter is formed to be smaller as the outer peripheral surface side is larger toward the inner peripheral surface side, and is arranged in a tightly aligned manner so that there is almost no gap on the outer peripheral surface. The pressing member is made of a roll,
Preferably, a plurality of cylindrical dies are provided at intervals on the outer peripheral surface.

[0006]

According to the granulating apparatus of the present invention constructed as described above, the large number of holes of the cylindrical die are increased on the outer peripheral surface side.
It is formed smaller on the inner peripheral surface side, and is arranged closely so that there is almost no gap on the outer peripheral surface, so that it is possible to granulate tight pellets with good shape and with less force The supplied resin material is extruded without stagnation on the outer peripheral surface of the die, so that energy can be saved, there is no risk of resin burning, and the production efficiency can be significantly improved. When the pressing member is formed of a roll and a plurality of pressing members are provided at intervals on the outer peripheral surface of the cylindrical die, production space can be saved.

[0007] Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0008]

1 to 6 show first and second embodiments of a granulating apparatus according to the present invention.
As shown in the figure, the granulating apparatus 1 of the present invention is rotatably supported and has a large number of holes 7 in the outer peripheral surface 6 with almost no gap.
Closely aligned with the cylindrical die 2 provided, this circle
Pressing member 3 installed close to the outer peripheral surface of cylindrical die 2
And resin A supplied between the rotating die 2 and the pressing member 3 and extruded from the hole 7 of the die 2 to the inside of the die 2.
And a fixed blade 4 which cuts and granulates the inside of the die 2.

As shown in the figure, a die 2 of a granulating apparatus 1 of the present invention has a cylindrical dish or cup shape, and has a cylindrical peripheral portion 5 and one end edge of the cylindrical peripheral portion 5. It is formed in a cylindrical dish or cup shape from a flange-shaped side plate portion 8 provided integrally, and a rotating shaft 9 is attached to a central portion of the center of the side plate portion 8. As shown in the figure, for example, the axis of the rotating shaft 9 is disposed substantially horizontally and is rotatably supported. As shown in FIG. 4, a large number of holes 7 are provided on the outer peripheral surface 6 of the cylindrical die 2 so as to be closely aligned with almost no gap as shown in FIG. . As shown in FIG. 5, the diameter of these holes 7 is large on the outer peripheral surface 6 side of the cylindrical peripheral portion 5 and tapered so as to become smaller toward the inner side. It is made to be pushed into without waste. In particular, as clearly shown in FIG.
Means that there is almost no gap between the adjacent holes 7
Since they are closely aligned, the supplied resin
All can be extruded inside the die 2 without staying on the outer peripheral surface 6 .

In order to push the resin A into the hole 7 of the die 2, a pressing member 3 is provided close to the outer peripheral surface 6 of the die 2 at a predetermined interval. The pressing member 3 is preferably a circular member such as a roll, and is made of, for example, a metal material such as steel or a hard resin material. Further, it is preferable that the pressing member 3 rotates in a direction opposite to the rotation direction of the die 2.

A fixed blade 4 is provided inside the die 2 for sequentially cutting and granulating the resin A pushed into the hole 7 of the die 2 by the pressing member 3. The fixed blade 4 is mounted such that the blade edge is located close to the inner peripheral surface of the peripheral portion 5 of the die 2.

The granulating apparatus 1 of the present invention thus configured
In the first, the continuum of resin A, which is heated by a suitable heating device such as a heating drum to give flexibility ,
It is supplied between the outer peripheral surface 6 of the rotating cylindrical die 2 and the pressing member 3, is sandwiched between the two members of the die 2 and the pressing member 3, and is pressed by the pressing member 3 to press the outer peripheral surface 6 of the die 2. pressed into the hole 7, the die 2 through the hole 7
Extruded inside. Next, the resin A extruded into the die 2 is sequentially cut by the fixed blades 4 provided inside the die 2 and granulated into pellets. The resin A granulated into pellets in this manner is appropriately cooled, for example, by a cooling and conveying device, and is conveyed to the next step.

As described above, in the granulating apparatus 1 according to the present invention, the resin A supplied between the die 2 and the pressing member 3 causes the hole 7 of the die 2 to be pressed by the pressing force applied by the pressing member 3.
The resin is gradually pushed into the inside, and while being pushed, a shearing force is applied to the resin and the resin is sheared and pushed out from the hole 7. The resin extruded from the hole 7 to the inside of the die 2 has a string shape,
This string-shaped resin is cut by the fixed blade 4 and granulated into pellets. The pellet to be granulated can have any shape depending on the shape of the hole 7, the thickness of the supplied resin A, and the like. The distance between the die 2 and the pressing member 3 can be appropriately selected according to the thickness of the resin continuum. In particular, the distance between the die 2 and the pressing member 3 is
It is preferable that the pressing members 3 are provided at intervals so as not to directly contact with each other, and are slightly thicker than the thickness of the continuum of the resin, that is, larger intervals. Further, the die 2, the pressing member 3, and the fixed blade 4 may be heated to an arbitrary temperature as needed,
Can be cooled. Further, the continuum of the resin includes a heating drum, an electric heater,
It is preferable to be heated to a soft state by an infrared heater or the like, and the material of the roll-shaped pressing member 3 can be not only metal but also resin and the like.

[0014] Figure 6, there is shown a granulating apparatus 1 'according to a second embodiment of the present invention, in the second embodiment, a plurality of pressing around the die 2 as illustrated members 3a, 3b, together with 3c are provided at intervals, circles
A plurality of fixed blades 4a, 4b, 4c are provided inside a cylindrical die 2.
Are provided correspondingly . As in the first embodiment , there are almost no gaps on the outer peripheral surface of the cylindrical die 2 as in the first embodiment .
Sea urchin is provided closely aligned, for example, a continuum of the resin A was made flexible is heated to an appropriate temperature in the heating drum is supplied onto the outer peripheral surface of the die 2 which rotates, first the first The first pressing is performed by being sandwiched between the pressing members 3a, the next pressing is performed between the second pressing members 3b, and the final pressing is performed between the third pressing members 3c. Pressing is performed. In this way, the continuum of resin A is first, second,
The outer peripheral surface of the die 2 is pressed by the third pressing members 3a, 3b, and 3c, sequentially pushed into the holes of the die 2, and is pushed into the inside of the die 2 through the holes 7 of the die 2 in a string shape. , First, second, third fixed blades 4a, 4b, 4
is cutting off sequentially pelleted by c, it is granulated into pellets.

In the second embodiment, the distance between the first, second, and third pressing members 3a, 3b, and 3c and the outer peripheral surface of the die 2 is preferably narrow and small in order. .

[0016]

According to the granulating apparatus of the present invention, a large number of holes in the cylindrical die have a large diameter on the outer peripheral surface side.
Formed small enough becomes the side, because it is almost aligned closely so that there is no gap on the outer peripheral surface, the shape of the good
You can granulate good compact pellets
In addition, the resin material supplied with a small force is extruded without stagnation on the outer peripheral surface of the die, so that energy can be saved, there is no risk of resin burning, and the production efficiency is significantly improved. Incidentally, the pressing member consists of a roll, in the case of providing a plurality are spaced on the outer peripheral surface of the cylindrical die, it could be spared the production space.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of a granulating apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of a die of the granulating apparatus of FIG.

FIG. 3 is a side view showing the die of FIG. 2 in a partial cross section.

FIG. 4 is a partial plan view showing an arrangement of holes on the outer peripheral surface of the die of FIG. 2;

FIG. 5 is an enlarged cross-sectional partial view showing a state of holes of the die of FIG. 2;

FIG. 6 is a schematic diagram showing a second embodiment of the granulating apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granulating device 1 'Granulating device 2 Die 3 Pressing member 3a Pressing member 3b Pressing member 3c Pressing member 4 Fixed blade 4a Fixed blade 4b Fixed blade 4c Fixed blade 5 Peripheral portion 6 Outer peripheral surface 7 Hole 8 Side plate portion 9 Rotating shaft

Claims (2)

(57) [Claims] 1. A cylindrical die, which is rotatably supported and has a large number of holes formed on an outer peripheral surface thereof, and a pressing member provided close to the outer peripheral surface of the cylindrical die, wherein A pressing member for pressing a flat resin material, which has been given flexibility by being heated by a heating device supplied therebetween, into a plurality of holes provided in the die, and is pushed out of the die by the pressing member. In order to cut off the resin, in a granulating apparatus comprising a fixed blade provided inside the die, the large number of holes are formed such that the diameter of the holes becomes larger on the outer peripheral surface side and smaller on the inner peripheral surface side. A granulator characterized in that the surfaces are closely aligned so that there are almost no gaps on the surface. 2. The granulating apparatus according to claim 1, wherein the pressing member comprises a roll, and a plurality of the pressing members are provided at intervals on an outer peripheral surface of the cylindrical die.