JP3130788B2 - Separation, alignment and dewatering equipment for thermoplastic resin strands - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydrating apparatus for a thermoplastic resin strand, and more particularly to a thermoplastic resin strand continuously discharged from a plurality of die nozzles while being cooled with water and cut by a rotary cutter to form a pellet. The present invention relates to a thermoplastic resin strand dehydrator for efficiently dehydrating or removing cooling water attached to the surface of the strand group when manufacturing (chips).

[0002]

2. Description of the Related Art Conventionally, a strand granulator (St)
In a rand granulator (beretizer or granulator), a molten resin extruded from a die nozzle is introduced into a cooling water tank (cooling bath or quench bath), cooled and solidified in a strand shape, and then passed through a take-off roller of a strand cutter. In the strand cut method that performs one-stage vertical cutting with a fixed blade and a rotating blade,
A so-called dry cut method in which cooling water is dehydrated and removed before the strand cutter is often used. In this dry cutting method, when dewatering the cooling water adhering to the strand group, a blow method of blowing dry air to the strand group, a blessing method of suctioning and dewatering from the gap of the strand group, a pneumatic method, There is a squeeze method in which a squeeze is taken with a soft rubber roller or the like. On the other hand, when the strand group is carried into the strand cutter, it is provided with only a suction means of a type which functions as a so-called take-up roll in which grooved rollers and comb teeth are fixed, which are usually equal to the number of strands. Or, although equipped with suction means, the comb teeth are fixed and do not rotate,
A dewatering apparatus without so-called strand separation and alignment has been proposed.

[0003]

The dewatering apparatus for the thermoplastic resin strand in the above-mentioned conventional strand granulator is of the dry cut type, so that the strand group enters the strand cutter before entering the strand cutter. It is essential that the strand groups are aligned, and if the strand group composed of a predetermined number of strands is not separated for each strand, in certain parts, the strands come into contact and overlap. In other words, it is directly cut into the feed roll of the strand cutter in the next process, causing not only so-called miscut, but also
Since the dehydration and removal of the cooling water adhering to each strand is not uniform and the efficiency is not good, it is necessary to separate and align each strand. However, none of them can simultaneously satisfy all of the separation, alignment, and dehydration of the strands, and there is a problem that each of the steps of strand separation, alignment, and dehydration must be performed separately. The present invention, at the time when the strand group is separated and aligned, efficiently and reliably suction and dewater, and furthermore, the amount of intake air can be adjusted,
It is an object of the present invention to provide an apparatus for separating, aligning and dewatering thermoplastic resin strands, which makes the dewatering effect more efficient and reliable.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a separation and dehydration apparatus for a thermoplastic resin strand according to the present invention comprises a cooling means for cooling and solidifying a thermoplastic resin strand extruded from a die head, and a cooling and solidifying means. In the strand granulator in which the dewatering means is disposed between the strand and the means for cutting the strand with the strand cutter,
A plurality of comb-shaped guide portions and a smooth guide bottom portion are provided with a strand separating means provided adjacent to each other in a cylindrical direction, and the separating means is rotated about an axis to rotate the guide portion and the guide bottom portion. A separating and aligning means for moving the suction opening, an intake opening is formed in the bottom of the guide, and an opening slit is provided at an axis of the separating and aligning means so as to be in contact with the intake opening, and the opening slit communicates with the intake opening. A possible suction means is provided, and the suction means is provided with a pipeline provided with a water-air separation means and a reduced-pressure blower, and the plurality of guide portions are provided independently of each other and individually rotated. , Separate strand group
It is characterized by being aligned and dewatered / removed.

In the apparatus for separating, aligning and dewatering thermoplastic resin strands according to the present invention, the strand groups are separated and aligned for each strand before the strand group enters the strand cutter, and the air is dehydrated by suction. In addition, the cooling water adhering to each strand can be uniformly dehydrated / removed, and the dehydration / water removal can be performed extremely efficiently and reliably, and the running posture of the strand group can be regulated.

In the apparatus for separating, aligning and dewatering thermoplastic resin strands having the above-described structure, a plurality of comb-shaped guide portions are provided independently of each other, and are individually rotated to separate and align the group of strands. The processing of the strands can also be performed manually according to the environment such as the number of strands constituting the strand group, the state of the strand group, and the speed.

Further, according to the present invention, inside the intake means,
A cylinder having an opening slit is provided, and each ring-shaped guide portion having a guide bottom integrated therewith is externally fitted to this cylinder, and each guide portion is rotated to open the opening slit with respect to the intake opening. In some cases, the width is adjusted and dewatering / water removal is performed through an opening slit.

According to the above configuration, the amount of intake air is adjusted by adjusting the opening width of the opening slit with respect to the intake opening.
You can get the intake speed according to the conditions of the strand,
Not only can the dehydration / removal of the cooling water adhering to the strands be reliably performed, but also the speed of the strand granulator can be increased to achieve high production, and the energy consumption for extra intake is minimized. Energy savings. In addition, since the rotation of the comb-shaped guide portion and the guide bottom for separating and aligning the strand group and the rotation for adjusting the opening width of the opening slit with respect to the intake opening can be performed by the same series of means, the apparatus can be used. Can be simplified.

Further, according to the present invention, the outlet of the reduced-pressure blower is connected to the intake means, and air is blown to the group of strands.
Dehydration and water removal may be required.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a thermoplastic resin strand separating and aligning and dewatering apparatus according to the present invention.

FIG. 6 is a schematic side view of a strand granulator provided with an apparatus for separating and dewatering thermoplastic resin strands according to a comparative example of the present invention, and FIG. 7 is a plan view thereof. A granulator comprising a die head 1, a cooling bath zone (quench bath) 2, a separating and aligning and dewatering device 3, a strand cutter 4, and a pipeline 6 with a reduced-pressure blower 5 including water-air separating means. Is done.

In the above apparatus, a molten thermoplastic resin is discharged from a die nozzle (not shown) having a required diameter attached to a tip of a die valve (not shown) of the die head 1 to form a strand group S and the strand group S. The group S is guided to a cooling tank zone 2 adjacent to a post-process of the die head 1 of the strand granulator SG, and is cooled and solidified when immersed in cooling water in the cooling tank.

The cooling length L of the cooling tank zone 2 is set to obtain an appropriate cooling length depending on the condition of the strand required for the pellet. Further, the total width B1 of the strand group S at the time of exiting the cooling tank or the separation / alignment dewatering device 3 is appropriately determined according to conditions such as the number of strands, the diameter of the strands, and cooling. For the total width B1 of the strand group S,
The total width B2 of the strand group S at the entrance of the strand cutter 4 is set to be small, and is appropriately determined depending on the width of the strand cutter 4.

The above-mentioned cooling tub may be moved to the left and right in operation, and in order to facilitate this movement, wheels for moving the cooling tub may be installed at the lower part. In some cases, the strand is pinched and the strand is forcibly transported.

The molten strand group S discharged into the cooling tub is sequentially guided by a guide plate (not shown) or a guide bar (not shown) provided in the cooling tub, and is then cooled. When moving through the inside, predetermined cooling and solidification is performed, and then, it is sent to a dewatering device 3 which also serves as a separation and alignment of a comparative example of the present invention, via a tension lever (not shown) provided at a cooling tank end position.

When arranging the strand group S,
When the strand group S is carried into the strand cutter 4, the fixed grooved rollers and comb teeth are used, and when the operation of the strand granulator SG is started, conversely, extra grooves and combs are used. No straight guide rollers are more convenient for operation. However, by the time the operation enters a stable state, it is most important to separate and align the strand groups S one by one with grooves or comb teeth. In this way, at the time when the strand group S is separated and aligned, the suction and dehydration is performed efficiently and reliably, and further, the amount of intake air is made adjustable, so that the dehydration effect is made efficient and reliable. In the comparative example of the present invention, the separation and alignment dewatering device 3 shown in FIGS. 1 to 3 is employed.

This separation / alignment / dehydration apparatus 3 includes a die head 1
In the dewatering device 3 disposed between the cooling means for cooling and solidifying the extruded thermoplastic resin strand and the cutting means for cutting the cooled and solidified strand, a comb-shaped guide portion corresponding to the number of strands is provided. A guide separating means for providing a smooth guide bottom and a strand separating means provided adjacent to each other in a cylindrical direction, and separating and aligning means for rotating the guide part and the guide bottom by rotating the separating means about an axis; An intake opening is formed at the bottom, and at the axis of the separation and alignment means,
An intake means is provided in which an opening slit is inscribed in the intake opening and the opening slit can communicate with the intake opening. And a cylinder having a comb-shaped guide portion, a guide bottom portion and an intake opening formed inside the intake means,
A cylinder provided with an opening slit internally and provided with an opening slit is provided inside the cylinder. By rotating these cylinders, the opening width of the opening slit with respect to the intake opening can be adjusted. Is provided with a pipeline 6 provided with a water-air separation means and a reduced-pressure blower 5. As shown in FIGS. 1 to 3, the separation / alignment dewatering device 3 has an outer tubular comb-shaped cylinder 32 rotatably fitted around the outer periphery of a cylindrical intake cylinder 31, and is integrated therewith.
An intake duct 33 is connected to the end of the intake cylinder 31 in an air-tight manner, and the intake duct 33 is connected to the pipe 6 so that intake is possible, and an intake opening slit 31a extends along the longitudinal direction of the intake cylinder 31. To form Also, on a part of the outer periphery of the comb-tooth cylinder 32, a large number of comb-tooth (guide portions) 34, 34, ... that are arranged in a row at predetermined intervals along the longitudinal direction of the comb-tooth cylinder 32. , Adjacent comb teeth 3
A single strand is inserted between the teeth 4 and 34, and an intake opening 35 is formed in the bottom (guide bottom) between the comb teeth 34 and 34, that is, in the outer periphery of the comb cylinder 32. I have. Further, the intake cylinder 31 and the comb-tooth cylinder 32 are provided with pinions 36 and 37, respectively, and racks 38 and 39 are meshed with the pinions 36 and 37, respectively. The intake cylinder 31 and the comb-tooth cylinder 32 are configured to rotate individually via 37, and the intake opening width of the opening slit 31a with respect to the intake opening 35 can be adjusted.

FIG. 2 shows a longitudinal sectional side view of the apparatus 3. FIG. 2 (a) shows that the comb teeth 34 are folded down at the beginning of the running of the strand at the start of operation, that is, at the beginning of the separation of the strand. FIG. 4B shows a state in which intake dehydration has not yet been performed. In FIG. 4B, the comb teeth 34 are gradually returned to their normal positions, and the strand groups S are separated and aligned one by one. Intake opening slit 31a and bottom opening 3
5 overlap with each other to form a synthetic intake opening width t1, and a state in which dehydration work by intake is being performed. FIG. 2C is a cross-sectional view of a tooth bottom portion.
FIG. 3 is a cross-sectional view as viewed from the comb teeth portion, showing a state in which the strand is transferred on the other side of the comb teeth 34, that is, on the adjacent tooth bottom, and the air is dehydrated at the tooth bottom.

FIG. 3 is a sectional view showing how the width of the intake opening of the dehydrating device 3 is adjusted. When the comb teeth 34 return to the normal position, the intake opening 35 at the bottom of the teeth between the comb teeth 34 and the opening slit 31a of the intake cylinder 31 correspond to each other, and the combined intake opening width t2 is smaller than t1. It shows the place. By doing so, the suction capacity for dewatering is increased, and dewatering efficiency is improved. The synthetic intake opening width t2 is appropriately determined depending on the condition of the strand or the condition of the strand granulator SG.

In the above configuration example, first, in the cooling means for cooling and solidifying the thermoplastic resin strand extruded from the die head 1 and the dewatering device 3 disposed between the strand cutter 4 for cutting the cooled and solidified strand, At the start, the strand group S transferred from the cooling tank zone 2 is supported by the guide bottom of the strand separating means and is carried into the strand cutter 4 in a state almost close to the bundle. And
When the operation is slightly stabilized after the start of the operation and the strand group S is stabilized, the strand separating means is sequentially rotated, and the strand group S is aligned by the comb teeth 34 of the strand separating means. At this time, in the strand separating, aligning and dewatering apparatus 3, a plurality of comb-shaped guide portions can be provided independently of each other and individually rotated to separate and align the strand group S.

As described above, since the opening slit 31a is provided at the bottom of the strand separating means, the depressurized air connected to the pipeline 6 provided with the water-air separating means and the depressurized blower 5 is provided. , The cooling water adhering to the strand is dehydrated and removed.

The suction means is connected to a reduced-pressure blower 5 having a water-air separation means for dehydrating and removing cooling water adhering to the strand group S. At this time, the vacuum blower 5
Can be connected to the outlet of the reduced-pressure blower 5 to blow compressed air to the strand group S to dehydrate and remove the cooling water attached to the strand group S.

The dehydrated strand group S is sent to a feed roller (not shown) of the strand cutter 4 in the next step, and fixed blades (also called dead knives or bed knives) provided on the strand cutter 4 (not shown) ) And a rotary blade that rotates at a predetermined speed (also referred to as a rotary cutter 4).
(Not shown) to obtain a desired pellet (chip). Behind the strand cutter 4, a reduced-pressure blower 5 including water-air separation means is provided, and the separation / alignment dehydrator 3 and the reduced-pressure blower 5 are connected by a pipe 6.

As shown in FIG. 6, if Y-Y is connected to the pipeline 6, the reduced pressure air is blown, and the separation / alignment dewatering device 3 is operated by the suction dewatering system. Further, as shown in FIG. If YX is connected to the other air discharge port of the blower 5, the separation / alignment dewatering device 3 will be of a gas discharge dewatering type.

FIGS. 4 and 5 show an embodiment of the present invention. The difference from the comparative example will be described.
1 and the tooth bottom (guide bottom) are integrated, and a plurality of comb teeth 21 corresponding to the total number of strands are externally fitted on the outer circumference of the intake cylinder 31 independently as a ring-shaped independent one, and individually turned. The strand group S is moved to separate and align.

Each of the comb teeth 21 has a suction opening 2 at the bottom thereof.
The comb teeth 21 are rotatably fitted into the intake cylinder 31 in an airtight manner, and the main body portion (projecting portion) of the comb teeth 21 is disposed on the upper side. A spring hole 26 is formed in the lower part of the intake cylinder 31 and opens downward and a spring 27 is inserted into the lower part of the comb tooth 21. A ball hole 29 is formed in the lower part of the comb tooth 21. And is pushed by the spring 27 so that the ball hole 2
When the ball 28 enters the comb 9, the comb tooth 21 stops at a fixed position. The position of the ball hole 29 is such that the main body portion of the comb teeth 21 is located directly above the intake cylinder 31 and the comb teeth 31 can be fixed when the strands are interposed and separated and aligned.

When the operation of the strand granulator SG is started, the main body portion of each comb tooth 21 is tilted backward of the advance of the strand, and when the advance of the strand becomes normal, the individual comb teeth 21 are manually moved. , The main body portion rotates right above, the ball 28 enters the ball hole 29 at a predetermined position, and the comb teeth 21 are fixed. At this time, air is sucked in through the opening slit 31a of the intake cylinder 31 by the intake opening 23 previously opened in the bottom of the comb teeth 21, and the cooling water adhering to the strand is dehydrated and removed.

[0028]

According to the present invention, before the strand group enters the strand cutter, the strand group is separated and aligned for each strand, and the air is dehydrated by suction. The dehydration and dewatering of the cooling water can be made uniform, and dehydration and dewatering can be performed very efficiently. Further, there is an advantage that the running posture of the strand group can be regulated, the cooling water attached to the strand running at high speed can be efficiently removed, and the dewatering can be reliably performed.
Further, since a plurality of comb-shaped guide portions are provided independently of each other and individually rotated to separate and align the strand groups, the number of strands constituting the strand group, the state of the strand group, the speed, etc. There is an advantage that the processing of the strand can be performed manually according to the environment.

According to the second aspect of the present invention, the amount of intake air is adjusted by adjusting the opening width of the opening slit with respect to the intake opening, so that the intake speed can be obtained in accordance with the strand conditions. Not only can the dehydration / removal of the cooling water adhering to the surface be reliably performed, but also the speed of the strand granulator can be increased and high production can be achieved.
Energy consumption for extra intake can be minimized,
Energy saving can be achieved. Furthermore, the rotation of the comb-shaped guide portion and the guide bottom for separating and aligning the strand group,
Since the rotation for adjusting the opening width of the opening slit with respect to the intake opening can be performed by means of the same series, the apparatus can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a thermoplastic resin strand separation / alignment dewatering apparatus of a comparative example of the present invention.

FIG. 2 is a vertical sectional side view of the separation / alignment / dehydration apparatus.

FIG. 3 is an explanatory view showing an opening width adjuster groove of the separation / alignment / dehydration apparatus.

FIG. 4 is a longitudinal sectional front view showing a tooth bottom portion according to an embodiment of the present invention.

FIG. 5 is an enlarged explanatory view of the same.

FIG. 6 is a schematic side view of a strand granulator provided with an apparatus for separating, aligning and dewatering thermoplastic resin strands according to a comparative example of the present invention.

FIG. 7 is a plan view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die head 2 Cooling tank zone 3 Separation alignment dehydration apparatus 4 Strand cutter 5 Decompression blower 6 Pipe line 21 Comb teeth (guide part) S Strand group SG Strand granulator

Claims (3)

(57) [Claims] 1. A strand granulator having a dewatering means disposed between a cooling means for cooling and solidifying a thermoplastic resin strand extruded from a die head and a means for cutting the cooled and solidified strand with a strand cutter. A plurality of comb-shaped guide portions and a smooth guide bottom portion, a strand separation means provided adjacent to each other in the cylindrical direction, and the separation means is rotated about an axis to separate the guide portion and the guide bottom portion. Providing separation and alignment means for rotating, forming an intake opening at the bottom of the guide, and at the axis of the separation and alignment means,
An intake means is provided so that the opening slit is inscribed in the intake opening and the opening slit can communicate with the intake opening, and the intake means has a pipe provided with a water-air separation means and a reduced-pressure blower. A plurality of guide portions provided independently of each other, and individually rotated to separate and align the strand group, and to dewater and remove water. Dehydration equipment. 2. A cylinder having an opening slit is provided inside the air intake means, and each ring-shaped guide portion having an integrated guide bottom is fitted to the cylinder, and each guide portion is rotated. 2. The apparatus for separating and aligning thermoplastic resin strands according to claim 1, wherein the width of the opening slit relative to the intake opening is adjusted to perform dehydration and water removal through the opening slit. 3. The separation and dehydration of a thermoplastic resin strand according to claim 1 or 2, wherein the outlet of the reduced-pressure blower is connected to an intake means, and air is blown to a group of strands to dehydrate and remove water. apparatus.