JPH11291239A - Pelletizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a pelletizer by which pellets with a good shape can be obtd. even from a soft strand. SOLUTION: A pelletizer by which a resin strand extruded from a resin extruder and cooled is cut into pellets is provided with a pair of feed rolls 21 and 22, a rotating blade 25 arranged in the direction to which the strand 27 is forwarded from the feed rolls 21 and 22, a guide roll 23 arranged between the feed rolls 21 and 22 and the rotating blade 25 and guiding the strand forwarded from the feed rolls 21 and 22 from the underside and a fixed blade 24 arranged between the feed rolls 21 and 22 and the rotating blade 25 and making the apex of a cutting edge 24a face to the rotating blade 25 and arranged at a larger distance than the diameter of the strand 27 above the guide roll 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a pelletizer. More specifically, the present invention relates to a pelletizer used for cutting a strand extruded from a resin extruder and cooled into pellets.

[0002]

2. Description of the Related Art A conventional pellet manufacturing apparatus is shown in FIG.
In this method, a resin extruder 1 and a strand (string-like resin) 2 extruded from the resin extruder 1 are connected to a plurality of pipes 3.
It comprises a slanted gutter-like transport path 5 for transporting while cooling with a water flow formed by water 4 supplied from the plant, and a pelletizer 7 for cutting the cooled strand 2 into pellets 6.

As shown in FIG. 5, the pelletizer 7 includes a guide roll 8, a chute 9, a pair of feed rolls 10 and 10 'for drawing the strand 2 supplied from the guide roll 8 and the chute 9, and A fixed blade 11 for cutting the strand 2 sent from the feed rolls 10 and 10 ', and a rotary blade 12. The fixed blade 11 supports the strand 2 from below, and the rotary blade 12 rotates in the direction of arrow A. Thus, the strand 2 on the fixed blade 11 is cut downward from above.

[0004]

In the above conventional pelletizer, there is no problem when the strand is made of a hard material such as polyester, polycarbonate, ABS, etc., but it is called an elastomer such as polyethylene. If it is soft, it has a weak waist, and it sags and bends from the feed rolls 10 and 10 'to the rotary blade 12 due to gravity, so that it is cut obliquely and has a good shape. There was a problem that can not be obtained.

As a countermeasure against this, the feed rolls 10, 1
It is sufficient to reduce the distance between 0 'and the rotary blade 12, but there is a problem that the distance cannot be easily reduced because the fixed blade 12 is between them. Also, feed roll 1
Even if a flat plate guide is provided between 0, 10 'and the rotary blade 12, there is a problem that a strand is attached to the guide and is bent.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to realize a pelletizer capable of obtaining pellets having a good shape even from a soft strand.

[0007]

According to the present invention, there is provided a pelletizer for cutting a resin strand extruded from a resin extruder and cooled into pellets,
A pair of feed rolls 21 and 22, a rotary blade 25 arranged in a direction in which the strand 27 is fed from the feed rolls 21 and 22, and the feed rolls 21 and 22;
A guide roll 23 disposed between the rotary blade 2 and the rotary blade 25 to guide the strand 27 sent from the feed rolls 21 and 22 from below;
A fixed member is disposed between the rotary blade 25 and the rotary blade 25, the tip of the cutting blade 24 a is opposed to the rotary blade 25, and is disposed above the guide roll 23 at a distance larger than the diameter of the strand 27. The guide roll 23 is driven to rotate slightly faster than the strand feed speed of the feed rolls 21 and 22, and the rotary blade 25 lowers the strand 27 sent from the feed rolls 21 and 22. From above to form pellets.

By employing this configuration, the distance between the guide roll 23 and the rotary blade 25 is reduced, and the rotary blade 25
Cuts the strand 27 from bottom to top,
The strand 27 does not sag downward, and the strand 27 is cut at a right angle, so that a pellet having a good shape can be obtained.

[0009]

1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view and FIG. 2 is a sectional view. As shown in FIG. 1, this embodiment includes a housing 20, a pair of feed rolls 21 and 22, a guide roll 23, a fixed blade 24, a rotary blade 25, and a drive motor 26. I have.

As shown in FIG. 2, a lower roll 22 of a pair of feed rolls 21 and 22 is driven to rotate by a drive motor 26, and an upper roll 21 can be moved up and down by an air cylinder (not shown). Thus, it is possible to adjust the interval between the lower roll 22. Further, the guide roll 23 is provided with the feed roll 2.
The strands 27 sent out from the feed rolls 21 and 22 are arranged so as to be guided from below, and are rotated at a speed slightly higher than the strand feed speed of the feed rolls 21 and 22. As shown in FIGS. 3A and 3B, an annular groove 23a having a V-shaped cross section may be formed on the surface of the guide roll 23 at a pitch of about 4 mm over the entire length of the roll portion.

The fixed blade 24 has a plate shape, and a cutting blade 24a is formed on one side. The fixed blade 24 is disposed above the guide roll 23 at a distance equal to or larger than the diameter of the strand 27, and the cutting blade 24a thereof is arranged so as to face the rotary blade 25. It is fixed to a member 28.

The rotary blade 25 is arranged so that its cutting edge is opposed to the cutting blade 24a of the fixed blade 24, and is rotated by a drive motor 26 in a clockwise direction (direction of arrow A) in the figure. Has become. The housing 20 has an opening 32 into which a strand is introduced, an upper guide plate 29 formed in an arc shape above the rotary blade 25, and a rotary blade 25.
And a lower guide plate 31 arranged so as to drop the pellets onto the chute 30.

The operation of the embodiment constructed as described above will be described with reference to FIG. First, the resin strand 27 extruded and cooled by the resin extruder (not shown) is drawn in from the opening 32 of the housing 20 by the feed rolls 21 and 22, and is then sent out by the guide roll 23 in the direction of the rotary blade 25. Then, when it comes into contact with the rotary blade 25, it is cut by the cutting blade of the rotary blade 25 and the cutting blade 24a of the fixed blade 24 to form a pellet.

The pellet 33 is thrown upward by the rotary blade 25, but is guided by the guide plate 29 to the rear of the rotary blade 25 as shown by arrows a to d. It is discharged outside.

In this embodiment of forming pellets in this manner, even if the strand 27 is soft, the speed is slightly faster between the feed rolls 21 and 22 and the rotary blade 25 than the feed rolls 21 and 22. Since the guide rolls 23 rotating at the feed speed are provided, the strands 27 between the feed rolls 21 and 22 and the guide rolls 23 are provided.
The strand 27 is tensioned, does not sag, and because the distance between the guide roll 23 and the rotary blade 25 is short, the strand 27 is sent straight along the fixed blade 24.

Thus, the fixed blade 24 and the rotary blade 25 can cut the strand 27 at a right angle. Accordingly, the pellets 33 formed by cutting have a good shape, and the formation of pellets having a poor shape is prevented. When the groove is formed in the guide roll 23 as shown in FIG. 3, the groove 23a guides the strand, so that the strand 27 is sent straight forward without swinging left and right, and cut at a right angle by the rotary blade 25. A better pellet is obtained. In addition, the guide plate 29 allows the pellets 33 formed by cutting the strands 27 to fall backward above the rotary blade 25 and be discharged to the outside, and does not drop onto the rotary blade 25. Therefore, the pellet 33 is not damaged by the rotary blade 25.

[0017]

According to the pelletizer of the present invention, the strand is received between the feed roll and the rotary blade from below,
In addition, a guide roll that rotates at a slightly higher feed speed than the feed roll is provided, and a fixed blade is provided above the guide roll, and the strand is cut upward from below by the rotary blade, so that a soft strand is provided. Can be prevented from sagging downward, whereby the strands can be cut at a right angle and the formation of pellets with poor shape can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

3A and 3B are diagrams illustrating an example of a guide roll used in the embodiment of the present invention, wherein FIG. 3A is a side view, and FIG. 3B is an enlarged view of a portion B in FIG.

FIG. 4 is a perspective view showing a conventional pellet manufacturing apparatus.

FIG. 5 is a sectional view showing a conventional pelletizer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Housing 21, 22 ... Feed roll 23 ... Guide roll 24 ... Fixed blade 25 ... Rotating blade 26 ... Drive motor 27 ... Strand 28 ... Fixed blade fixing member 29, 31 ... Guide plate 30 ... Chute 32 ... Opening 33 ... pellet

Claims (1)

[Claims] 1. A pelletizer for cutting a resin strand extruded and cooled from a resin extruder into pellets, comprising: a pair of feed rolls (21, 22);
7) Rotary blade (25) arranged in the direction in which it is sent out
A guide roll (23) disposed between the feed rolls (21, 22) and the rotary blade (25) to guide the strand (27) sent from the feed rolls (21, 22) from below. Disposed between the feed rolls (21, 22) and the rotary blade (25), the tip of the cutting blade (24a) is opposed to the rotary blade (25), and above the guide roll (23). And a fixed blade (24) arranged at a distance larger than the diameter of the strand (27), and the guide roll (23) comprises a feed roll (21,
The rotating blade (25) cuts the strand (27) sent from the feed rolls (21, 22) upward from the lower side to form pellets. A pelletizer characterized by that: