JPH0334445B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention allows a plurality of strands discharged from the nozzle of an extruder to flow down together with cooling water flowing on a gutter-like flow plate, and cools the strands from above. This invention relates to a cooling and shredding device for molten strands, which aligns a plurality of strands in a straight line while cooling the strands and cooling water by blowing wind, and then shreds the strands underwater.

(b) Prior Art Conventionally, as a device for shredding a strand after cooling it by flowing it down, for example, as disclosed in Japanese Patent Publication No. 16806/1980, the strand extruded from a die is cut from above a flowing down trough. There was a device designed to cool the strands by flowing them down with supplied water, and to shred the strands with a shredding section provided at the lower end of the flowing down trough.

(c) Problems to be Solved by the Invention However, although the above-mentioned type of device has a higher cooling effect than a device that uses a water tank for cooling, it still cannot provide sufficient cooling. Highly sticky strands do not lose their stickiness even when they reach the shredded portion at the lower end of the flow trough, resulting in the problem that the shredded strands, ie, the resin pellets, stick to each other.

In addition, the strands flowing down on the downflow trough are
Since the strands are flowed down in the same state as when they were extruded from the die, that is, in the state in which multiple strands are lined up in parallel, this combined with the low cooling effect mentioned above causes the strands to become stuck together, especially in the case of strand breakage. It also had the problem of getting stuck.

Therefore, this invention took the above-mentioned problems into account, and achieved a high cooling effect, and also prevented the strands from sticking together even if a strand breakage suddenly occurred, and ensured the production of high-quality resin pellets. The object of the present invention is to provide a cooling shredding device for melted strands.

(d) Means for Solving the Problems This invention provides a gutter-like flow down plate having a generally U-shaped cross section, which is supported such that the die side of an extruder is high and the discharge part side is low, and the inclination angle is adjustable. a cooling water supply section provided at an upper end of the gutter-like flow plate and having a plurality of water discharge ports in the width direction of the gutter-like flow plate for discharging cooling water between the plurality of strands discharged from the die; A jet nozzle is installed above the lower plate, and jets cooling air in the direction of flow of each strand, on the same straight line as each of the plurality of water discharge ports, and at regular intervals along the direction of flow of each strand. A cooling shredding device for molten strands is characterized in that it comprises a plurality of air blowing means disposed at positions , and a strand cutting device provided at the lower end of a trough-like falling plate.

(e) Effect In the cooling and shredding apparatus for molten strands of the present invention, the inclination angle of the trough-like flow plate is adjusted according to the stickiness of the strand, and the strand is discharged from the die above the trough-like flow plate, and cooled water is ejected from the die. After the strand is cooled down by the action of the cooling water discharged from the water discharge port of the supply section and the cooling air jetted from the jet nozzle of the air jetting means, the strand is shredded by a strand cutting device.

The above-mentioned cooling flow means that the cooling air jetted from the jet nozzle provided near the water outlet at the upper end of the gutter-like flowdown plate forms an air curtain between the plurality of strands discharged from the die, and the strands are Prevents strands from coming into contact with each other while cooling. In response to this, the cooling water is similarly discharged from the position corresponding to between each strand, and flows to create a wall of cooling water between each strand, and at this time, the strand is cut by the strand cutting device while removing heat from each strand. Let it flow down to In this process, the cooling air jetted out from the jetting nozzles other than those mentioned above uses its wind pressure to align each strand in a straight line in the same way as the cooling water described above, and also absorbs the heat of the strands. It also cools the cooled water.

(F) Effects of the Invention As described above, according to the present invention, the strands are cooled by the cooling water and the cooling air, and the cooling air also cools the cooling water that has taken the heat from the strands, so a high cooling effect can be achieved. can be obtained.

Furthermore, the cooling water and cooling air are discharged from the water outlets and jet nozzles arranged in the same straight line along the gutter-like flow plate, so each strand discharged in parallel is the cooling water and cooling air. Since the strands flow down while being guided by the strands, even if a strand breaks or the like occurs, the strands never come into contact with each other, and it is possible to reliably prevent the strands from rubbing against each other as in the conventional case.

Therefore, high-quality resin pellets can be obtained without waste, and workability is also improved.

In addition, since the inclination angle of the trough-like falling plate can be adjusted, in combination with the high cooling performance mentioned above, this function can be used effectively, allowing each type of strand to be efficiently thinned. I can cut it off.

Furthermore, since the strands are cut by a shredding device underwater, there is less generation of powder that normally occurs during shredding, making the work easier.

(g) Embodiment An embodiment of the present invention will be described based on the drawings.

The molten strand cooling shredding device 1 of this invention includes:
A gutter-like flow-down plate 3 long in the front-rear direction with the die 2 side high and the discharge part side sloped low, a cooling water supply section 4 provided at the upper end thereof, and the gutter-like flow-down plate 3 and the cooling water supply section 4. An air blowing means 5 provided at an upper position and blowing out cooling air in the downward direction of the water flow, a strand shredding device 6 arranged on the discharge side of the gutter-like falling plate 6, and this strand shredding device 6. Each of these devices is placed on a trolley 9, and is movable in the front and back direction by an air cylinder 10 with a cushion, which is connected to the trolley 9 and serves as a means for moving the trolley. It is configured.

Reference numeral 11 denotes a centrifugal dehydrator that receives the pellets shredded by the strand shredding device 6 and dehydrates them.

The gutter-like falling plate 3 is made narrower from the middle part in the longitudinal direction to the discharge part side, and is supported by two air cylinders 12 fixed to the cart 9 so that the inclination angle in the front and rear direction can be changed. ing.

The cooling water supply section 4 supplies the cooling water W introduced from the water supply pipe 13 connected to the lower part of the cooling water supply section 4 through a plurality of water discharge ports 14 provided on the upper surface of the gutter-like flow down plate 3 and the cooling water supply section 4 . It simultaneously flows out vigorously from the discharge port 15 on the top surface. The water discharge ports 14 are provided at regular intervals in the width direction of the gutter-like flow down plate 3, and discharge cooling water between each strand S discharged from the die 2 to guide the strand S.
A water film is formed on the upper surface of the gutter-like flow down plate 3.

Further, the cooling water flowing out from the discharge port 15 on the top surface of the cooling water supply section 4 covers the top surface of the cooling water supply section 4, and
At the start of work, the cart 9 moves forward to prevent the falling strands discharged from the die 2 from sticking to the upper surface of the cooling water supply section 4.

In the air blowing means 5, a plurality of cooling air blowing nozzles 16 are attached at regular intervals to air supply pipes 17, which are arranged in parallel in the length direction of the gutter-like flow down plate 3. These cooling air jetting nozzles 16 are used to forcefully feed cooling air in the downstream direction between the flowing strands S.
4... are arranged along the length direction of the gutter-like downstream plate 3 on the same straight line.

The cooling air jetting nozzles 16a located at the upper part of the cooling water supply section 4 mainly jet air between the strands S discharged from the die 2, and serve as an air guide to prevent adjacent strands S from coming into contact with each other. do.

Further, a valve 19 is provided at each connecting portion between each of the air supply pipes 17 and the main air supply pipe 18, so that the amount of air blown out can be adjusted.

In addition, 20 in the figure is a support frame of the air blowing means 5, and 21
are a pair of pulling rolls for the strand S provided in front of the rotary blade 7 in the strand shredding device 6.

Next, its effect will be explained.

First, the inclination angle of the trough-like falling plate 3 is adjusted according to the properties of the strands to be shredded. At the start of operation, if uneven strands S are discharged from the die 2 or strands that are likely to fuse together and produce defective chips are discharged, the air cylinder 10 is applied to pull the cart 9 toward the centrifugal dehydrator 11. Then, the upper end cooling water supply section 4 of the gutter-like downstream plate 3 is connected to the fifth
As shown by the two-dot chain line in FIG. 2, the irregular strands S, which are located forward from the bottom of the die 2, are taken out of the apparatus without being guided onto the gutter-like falling plate 3. When the strands S are discharged in unison, the rod of the air cylinder 10 is protruded and the cart 9 moves rearward, so that the upper end of the gutter-like flow plate 3 is below the die 2, as shown in FIG. The strand S to be discharged flows down together with the cooling water flowing on the upper surface of the flow down plate 3.

When the trolley 9 moves, the strands that may fall onto the upper part of the cooling water supply section 4 are removed from the upper discharge port 1.
It is guided to the upper surface of the trough-like falling plate 3 by the water film flowing out from the trough-like falling plate 3.

The plurality of strands S falling from the die 2 are guided by the air ejected from the cooling air ejection nozzle 16a behind the strands S, and are partitioned into air curtains to prevent mutual contact and shaving. It is prevented from sticking.

The plurality of strands S... that have fallen onto the upper surface of the gutter-like flow down plate 3 are guided and cooled by the cooling water W at both ends, which flows out vigorously from the water outlet 14, and flow downward. Immediately, each strand S is aligned in a straight line by the cooling air A from the cooling air injection nozzle 16 that is ejected from above in the downstream direction, and
The strands S... and the cooling water reach the lower end of the falling plate 3 while cooling both.

Since the gutter-like flow down plate 3 is formed to be narrow from the middle, the thickness of the water film of the cooling water W becomes large, and the strands S are transferred in a state completely immersed in water.

Therefore, the strand S... is efficiently cooled by the flowing cooling water and the cooling air from above, and at this time, the cooling water that has taken the heat from the strand is removed by the cooling air from above. The cooling of the strands S... becomes even more effective. Therefore, each strand S is hardened to a state where it can be shredded by the time it reaches the lower end of the trough-like falling plate 3, and is shredded underwater into pellets by the strand shredding device 6.

The shredded resin pellets are sent together with water to a centrifugal dehydrator 11 and dehydrated.

Since the device of the present invention configured in this way can obtain a high cooling effect, the strands S... can be sufficiently hardened before they reach the strand cutting device 6, and from this, the gutter-like The purpose of making the inclination angle of the falling plate 3 adjustable can be fully achieved, and rational cooling and shredding can be performed according to various types of strands. Also, strand S
It is also possible to shorten the length of the gutter-like flow plate 3 through which the water flows down, thereby making it possible to downsize the entire device.

Moreover, for effective cooling, the cooling water and cooling air are discharged from positions corresponding to the spaces between each strand S, so even if a strand breaks during operation, subsequent discharged strands will naturally flow. Since the resin pellets are guided and positioned by cooling water and cooling air, high quality resin pellets can be obtained without waste.

Also, in the case of short stride as mentioned above,
Work efficiency is greatly improved as continuous operation can be performed without the need for manpower.

Furthermore, since the strands S are shredded in water, less resin powder is generated during the cutting, and the probability of miss pellets occurring due to adhesion of shredded resin pellets to each other is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the entire device of the present invention, FIG. 2 is a plan view, FIG. 3 is a partially cutaway plan view of the cooling device, and FIG. 4 is a sectional view taken along the line B-B in FIG. 2. , FIG. 5 is an enlarged longitudinal sectional view of the cooling water supply section. DESCRIPTION OF SYMBOLS 1... Molten strand cooling shredding device, 2... Dice, 3... Gutter-like falling plate, 4... Cooling water supply section,
5... Air blowing means, 6... Strand shredding device, 14... Water outlet, 16... Cooling air blowing nozzle.

Claims (1)

[Scope of Claims] 1. A gutter-like flow plate having a substantially U-shaped cross section and supported so that the inclination angle can be adjusted by setting the die side of the extruder high and the discharge part side low; a cooling water supply section provided with a plurality of water discharge ports in the width direction of the gutter-like flow plate for discharging cooling water between the plurality of strands discharged from the die; and a cooling water supply section provided at an upper position of the gutter-like flow plate. , a plurality of jet nozzles that jet cooling air in the direction of flow of each strand are arranged on the same straight line as each of the plurality of water discharge ports and at regular intervals along the direction of flow of each strand. A cooling shredding device for molten strands, comprising an air jetting means and a strand cutting device provided at the lower end of a trough-like falling plate.