JPS62270306A - Pelletizing device - Google Patents

Abstract

PURPOSE:To prevent a strand from being broken by a method wherein the title device is provided with at least two sets of nip rolls, provided between an inner box and a take-up roll, a flow down chute for guiding the running of the strand and a rotary cutting edge for cutting the strand. CONSTITUTION:An inner box 53 is in an outer box 54, filled with cooling water at all times, to effect initial cooling of a strand 52. The strand 52 enters into two sets of a pair of first nip rolls 55, provided immediately below the inner box 53, and is nipped slightly, then, is sent into the flow-down chute 56 of groove type, which is provided below the nip rolls 55. The strand 52 enters into a second nip rolls 57, rotated slightly quicker than the first nip rolls 55 and providing the strand 52 with a light tension, together with the cooling water. Thereafter, the strand 52, passed out of take-up rolls 70, 71 through a third nip rolls 68, is cut by a rotary edge 72 to make a pellet 73 while the pellets 73 flow out of a discharging port 75 together with the cooling water.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Technical Field to which the Invention Pertains] The present invention is directed to the production of pellets by discharging molten resin from a nozzle in the form of a string, making the strand into a strand, cooling it to solidify it, and cutting it into pellets. Regarding equipment.

[Prior art] An example of a conventional pellet manufacturing apparatus will be described with reference to FIG.

In the figure, a plurality of strands 12 discharged from the nozzle 11 are arranged perpendicularly to the paper surface. The strand 12 enters a cooling water tank 15 having a cooling water inlet valve 13 and a cooling water outlet valve 14 and is cooled, and is guided by a plurality of guide rolls 16 submerged in water and a guide roll 17 provided on the top surface of the cooling water tank 15. Head toward the beletizer main body 18. Inside the beletizer body 18, there is a guide roll 19 provided below the strand 12, and a take-up roll 21 whose vertical position can be freely adjusted by an air cylinder or the like.
A transaction roll 20 having a smaller diameter and rotationally driven, a rotary blade 23 that cuts the strand 12 coming out of the take-up roll 20-21 into pellets 22, and a discharge port 24 for the pellets 22.
This is the provision.

In such a configuration, first, the plurality of strands 12 discharged from the nozzle 11 are manually tied, passed under the guide roll 16, passed through the guide rolls 17 and 19, and then passed through the take-up roll rotating at a low speed. After being picked up by the pellets 20 and 21, the pellets are cut into pellets 22 by a rotary blade 23. Next, the rotation speed of the take-up rolls 20 and 21 is increased to start operation at a predetermined speed.

Although this method is currently the most commonly used, it has the following drawbacks.

1) The initial operation to take the strand discharged from the nozzle to the take-up roll is manual, so the initial speed is slow, and even when accelerating to the specified speed, there is a risk of the strand breaking if the acceleration is increased, so the initial speed is slow until the specified speed is reached. , productivity is low.

2) Even though the strand is quite long between the nozzle and the take-up roll, there is no mechanism to forcibly feed it, so the take-up force of the take-up roll may cause it to break.
It becomes necessary to perform manual operations, which reduces productivity.

3) If the strand speed is increased, cooling becomes insufficient and problems occur when cutting with a rotary blade, and the pellets become crushed and the product value decreases. This can be done by making the cooling water tank longer, but the required floor space increases, the initial cost is high, and the operability becomes worse.

4) Due to these factors, it is difficult to process large volumes using this device, and there are hot cut type beretizers, underwater cant type beretizers, etc. to process this, but both are expensive.

In order to eliminate such drawbacks, the method shown in FIG. 6 has been proposed. In this method, the strand 12 discharged with the nozzle facing downward is arranged slightly obliquely 34-35 and cut into pellets 22 by a rotary blade 36. In addition, 37 is a cooling water artificial valve, and the cooling water is supplied from the pipe 38 to the pellet 22.
It flows out with the water.

In such a system, if the speed of the take-up rolls 34 and 35 is faster than the moving speed of the strand 12, the strand 12 becomes thinner in the case of FIG. 5, but the strand 12 becomes thinner in the case of FIG.
becomes thinner, and the right side of the strand 12, that is, the nozzle 1
There is a drawback that the vicinity of 1 rises upward and comes out from the cooling water, reducing the cooling effect.

FIG. 7 is an example in which the drawbacks of FIG. 6 are improved, and the nozzle 11 is not directed downward, but is placed on an extension of the downstream chute 32, and other aspects are the same as FIG. 6. However, in any of the above-mentioned systems, when the strand breaks between the nozzle discharge port and the take-up roll, the broken strand on the nozzle side has no take-up force and is guided to the take-up roll along the flow of cooling water. At this time, the strands, which are not sufficiently cooled because the speed of the cooling water cannot keep up with the moving speed of the strands, meander through the cooling water tank and come into contact with each other, making it impossible to continue the operation automatically.

FIG. 8 shows an example in which these drawbacks have been improved by using a vertical method in which the strands are drawn in the vertical direction. Since the cooling water tank 41 having the cooling water valve 13 is arranged in a slightly inclined and almost vertical state, when the strand 12 breaks, it is no longer moved by gravity and meandering. However, the position of the extruder a (not shown) to which the nozzle 11 is attached is high, and since it is installed on a higher floor than the floor on which the pellet manufacturing apparatus is placed, it has the drawbacks of poor operability and high initial cost. Also, because of the vertical shape, it was impossible to adjust the cooling length to 2JI, which caused problems with pellet drying in post-processing.

[Object of the invention] The present invention eliminates such drawbacks, and its object is to:
When the strand discharged from the nozzle is run by a take-up roll, the strand is prevented from breaking even if there is a slight difference between the running speed of the strand and the take-up speed, and even if the strand is broken, the strand is To provide a pellet manufacturing device that automatically travels toward a take-up roll and can continue operation.

Another object of the present invention is to provide a pellet manufacturing apparatus that is low in cost and high in productivity by increasing the running speed of the strand and narrowing the width of the nozzle, etc.

[Summary of the Invention] The pellet production equipment of the present invention includes a nozzle, an inner box located below the nozzle through which the strand discharged from the nozzle passes, and through which water flows downward to cool the strand, and the strand. A pair of take-up rolls that provide a take-up force, and at least 2! provided between the inner box and the take-up rolls!
Consisting of one or more pairs of nip rolls, a downstream chute that is provided along and below the nip rolls and guides the travel of the strands, and a rotary blade that is provided behind the take-up rolls to cut the strands and turn them into pellets. It is characterized by

[Embodiment of the Invention] Figures 1 to 4 showing an embodiment of the present invention will be explained below. The strand 52 discharged from the nozzle 51 enters the inner box 53. The inner box 53 is located inside the outer box 54 that is always filled with cooling water, and has a wide inlet opening for the flow of the strands 52.
The cooling water overflows the inlet of the inner box 53 and flows into the inner box 53 to initially cool the cold duct 52.

This is to prevent the strands 52 from winding up in a ball-shaped manner due to the molten state, resulting in poor operation, or from being crushed by the nip pressure, which would adversely affect the pellet shape, even if the strands 52 are not wound. In addition, the reason why the entrance of the inner box 53 is made wide and the exit narrow is to allow the strands 52 to come into sufficient contact with even a small amount of cooling water, and to prevent the strands 52 from falling straight down the slope of the inner box 53. This is to ensure that the cooling water is carried along with the cooling water to the outlet.

The strand 52 that has come out of the inner box 53 is provided directly below the inner box 53, at least one side is driven, one side or the other side is pressed to the opposite side by an air cylinder (not shown), and the outer peripheral surface is smoothed. Or did low left hook 2
A pair of books enter the first nip roll 55 and are lightly nipped. At this time, the strand 52 enters the first nip roll 55 together with the cooling water, so that it is smoothly nipped and taken off.

The strand 52 from which the first nip roll 55 has come out is fed into a downstream chute 56 which is provided below and has a channel-shaped cross section with a U-shaped cross section. The downstream chute 56 is horizontal in the longitudinal direction or has an inclined shape with the left side slightly lowered in FIG. Thereafter, the strand 52 enters the second nip roll 57, which rotates at the same speed as the first nip roll 55 or slightly faster, thereby preventing the strand 52 from sagging and applying a light pulling force, together with the cooling water. In order to allow the strand 52 to travel stably, a fixed presser plate 58 and a presser plate 59 whose distance from the strand 52 is adjustable are provided above the curved portion and main portion of the downstream chute 56.

The strands 52 on the downstream chute 56 are cooled by the cooling water flowing over the downstream chute 56 from the inner box 53. The amount of cooling water on the downstream chute 56 after the second nip roll 57 is adjustable, and as shown in FIG. In the figure, the right side of the downstream chute 56 has a relatively narrow gap 60, and the left side has a relatively wide gap 61. Since the adjusting plate 62 is attached below the gap 61 so as to be movable left and right, by changing this position and adjusting the amount of cooling water falling from the gap 61, the flow chute 56 after the second nip roll 57 can be adjusted.
Adjust the amount of cooling water above.

The cooling water that has fallen from the gaps 60 and 61 of the downstream chute 56 is received by the water tank main body 63, and the water tank main body 63 is deeper on the nozzle 51 side and flows out to the left as shown in Fig. 1 during operation. When stopped, the cooling water is discharged to the outside by opening the cooling water discharge valve 64.

The amount of cooling water on the downflow chute 56 can normally be supplied from the inner box 53, but in case that alone is insufficient, a plurality of sprays 65-66, 67, etc. are provided along the downflow chute 56. On the other hand, in the case of a resin containing filler or the like, cooling from the inner box 53 to the second nip roll 57 is sufficient since the cooling efficiency is good. In this case, the adjusting plate 6 is shown in Fig. 4 mentioned above.
2 to the left to close the gap 60 in the downstream chute 56.
By dropping the entire amount of cooling water from 61 into the water tank body 63, the strand 52 after the second nip roll 57 is dried.

The strand 52 that has exited the second nip roll 57 travels through a downstream chute 56 and enters a third nip roll 68 that is at the same speed as the second nip roll 57 or slightly faster. The strand 52 is discharged from the nozzle 51 and transferred to the third nip roll 6.
8, it is cooled down to the hardness required for cutting by the cooling water from the inner box 53 and the cooling water from the spray 65 used as needed.

Next, a take-up roll 7 is provided on the beletizer main body 69, and by making the upper diameter larger than the lower roll diameter and driving both, a large take-up force can be obtained with a light nip pressure.
At 0 and 71 the strand 52 is taken off. The strand 52 that has come out of the take-up rolls 70 and 71 is passed through the rotary blade 72
is cut into pellets 73, and this pellet 7
3 flows out from the discharge lower 5 together with the cooling water that has flowed in through the cooling water valve 74 provided in the beletizer main body 69, and is sent to the next process, the output process (not shown).

Note that the V-flowing chute 56 between the second nip roll 57 and the third nip roll 68 does not send the strand to the rotary blade while changing from a defective product to a regular product during resin switching, so a part of the V-flow chute 56 is a rotatable discharge chute. 76, and when discharging the defective strand, the tip is rotated upward as shown by the dashed line in FIG.

[Effects of the Invention] As explained above, the pellet manufacturing apparatus of the present invention is provided with an inner box directly below the nozzle through which the cooling water flows, through which the strands are passed, and between the inner box and the take-up roll that takes the strands. A falling chute was arranged to guide the running of the strand, and a plurality of nip rolls were provided above the falling chute to support the strand and apply a light pulling force to the strand.

Furthermore, a sprayer was installed near the plurality of nip rolls to spray cooling water as needed, and a presser plate was installed above the downflow chute to face and hold down the strands. With this configuration, the following effects were obtained.

1) The strand is supported by providing a plurality of nip rolls at short intervals, and a light pulling force is applied from the nip rolls, making it possible to weaken the pulling force of the take-up rolls, eliminating breakage while the strand is running. Ta.

2) For this reason, it is possible to reduce the number of strands without causing breakage even if the strand running speed is increased, so it is possible to reduce the width of the nozzle, each roll, and the rotating blade. to lower costs.

3) Even in the unlikely event that the strand breaks, each nip roll automatically picks up the strand, making it possible to continue operation without changing operating conditions.

4) Since the distance between the discharge port and the first nip roll of the nozzle is short and there is an inner box in the middle through which cooling water flows, even if a difference occurs between the strand speed and the take-up speed, it is sufficiently absorbed. Furthermore, since there is an inner box between the nozzle discharge port and the first nip roll, the strands are prevented from winding around the rolls and from forming irregular shapes in the strands.

5) The strands are cooled when the cooling water from the inner box flows over the falling chute, and when there is insufficient cooling water, it is injected from the sprayer.On the other hand, when using resin with high cooling efficiency, the cooling water is flowed over the falling chute and the second nip roll. Since the water is allowed to fall through the gap into the cooling water tank below, the temperature is optimal when cutting the strands.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1, and FIG. 3 is a 3-3 sectional view in FIG. 4 is an enlarged view of the Z section in FIG. 1, and FIGS. 6 to 8 are longitudinal sectional views of conventional examples having different shapes. 52... Nozzle, 52... Strand, 53...
Inner box, 55, 57, 68...Nip roll, 56...
・Flow-off chute, 70・71... Take-up roll, 72・
...Rotary blade, 73...Pellet

Claims (1)

[Scope of Claims] 1) A nozzle, an inner box located below the nozzle through which the strand discharged from the nozzle passes, and through which water for cooling the strand flows downward; A pair of take-up rolls that provide a take-up force, at least two or more pairs of nip rolls provided between the inner box and the take-up roll, and a pair of nip rolls provided along and below the nip rolls and the strand. A pellet manufacturing device comprising a downstream chute for guiding the traveling of the strand, and a rotary blade provided behind the take-up roll for cutting the strand into pellets. 2) The pellet manufacturing apparatus according to claim 1, characterized in that one side is driven as a nip roll, and the other side is adapted to adjust the nip pressure with respect to the one side by an air cylinder. 3) The pellet manufacturing apparatus according to claim 1, characterized in that a strand discharge chute is provided in the downstream chute between the second nip roll and the third nip roll. 4) The pellet manufacturing apparatus according to claim 1, wherein the plurality of nip rolls rotate at the same speed or at slightly faster speeds toward the rear. 5) The pellet manufacturing apparatus according to claim 1, wherein the downstream chute between the first nip roll and the second nip roll immediately below the nozzle is largely curved in this part. 6) At least one fixed holding plate that holds down the strand and a movable holding plate whose interval with respect to the strand can be adjusted so that the strand does not protrude from the falling chute in the event that the strand breaks on the falling chute. The pellet manufacturing apparatus according to claim 1, characterized by having the above-mentioned features. 7) The pellet manufacturing apparatus according to claim 1, characterized in that a cooling water spray is provided between each nip roll. 8) The pellet manufacturing apparatus according to claim 1, wherein the bottom of the water tank body is oriented upward with respect to the running direction of the strand, and a cooling water outlet is provided near the lowest part. 9) The pellet manufacturing apparatus according to claim 1, wherein the amount of cooling water falling into the cooling water tank can be adjusted by adjusting the gap between the second nip roll and the downstream chute.