JP3020009U - Strand cooling transport device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an apparatus capable of reliably cooling and conveying a strand [Structure] A molten strand S extruded from a die head 1 flows down along a conveyor device 3 to be cooled and solidified, In the device that cuts into chips by the cutting device, the conveyor device 3 that conveys the strand S from the die head 1 to the cutting device 15 is disposed below the die head 1 and has water permeability between the belt wheels arranged above and below. The conveyor belt 5 is stretched. Then, after the strands S that have flowed down along the conveyor belt 15 are cooled by jetting the strands S, suction removal means 6 that sucks the cooling fluid is arranged on the inner surface of the outward side of the conveyor belt.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling and conveying device for a strand, in which molten strands extruded from a die head are cooled and transported reliably to obtain chips of uniform quality.

[0002]

[Prior art]

 When manufacturing chips of thermoplastic resin, polymer strands in a molten state are extruded from a die head, cooled and solidified while flowing down along with cooling water on a guide device, and cut into chips by a cutting device. For example, the one disclosed in Japanese Patent Application Laid-Open No. 4-69211 proposes a strand cooling device in which the guide device is constituted by a single conveyor device that conveys the strand.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned known example, the strands are turbulently flowed down on the guide device. For this reason, the cutting device cannot cut the aligned strands, so the size of the chip is not uniform and the quality of the chip deteriorates, or the strand is cut on the guide device and the production efficiency deteriorates. There was a problem that In addition, there was a problem that the cooling liquid could not flow smoothly on the guide device and the cooling effect could not be improved.

An object of the present invention is to provide an apparatus capable of reliably cooling and conveying a strand, which can solve the above problems.

[0005]

[Means for Solving the Problems]

 The present invention was made in order to achieve the above-mentioned object, and in a device in which molten strands extruded from a die head flow down along a conveyor device to be cooled and solidified and cut into chips by a cutting device. The conveyor device that conveys the strand from the die head to the cutting device is arranged below the die head, and is constructed by stretching a conveyor belt with water permeability between the belt cars arranged above and below. The gist of the present invention is to arrange a suction / removal means for sucking the cooling fluid on the inner surface of the outward path of the conveyor belt after cooling the jetted strand with respect to the strand flowing down along. The gist of the conveyor device arranged in the die head / cutting device is to arrange it at a required inclination angle suitable for guiding and flowing down the molten strands extruded from the die head. .

[0006]

[Work]

 When manufacturing thermoplastic resin chips, a water-permeable conveyor device is driven to rotate. When the molten strand is extruded from the die head in this state, the extruded strand causes cooling water to flow from above the conveyor device and is positively conveyed by the rotational transfer of the water-permeable conveyor, and at the same time from the suction section. Since the water flow is formed below by suction so as to be orthogonal to the transport direction, the strands can be conveyed in a suctioned state on a water-permeable conveyor and aligned and flow down. Then, the strands are cooled and solidified while flowing down in an aligned manner, and the cooled and solidified strands are supplied to the cutting device in an aligned state, so that the strands are cut into chips more accurately and the quality can be improved.

[0007]

【Example】

 The strand cooling and conveying device of the present invention will be described below with reference to the illustrated embodiment. In the figure, 1 is a die head. This die head 1 is equipped with a batch-type polymerization kettle, for example, up to 50 nozzles in two rows, and a total of 100 strands S of molten thermoplastic resin or the like are extruded from each nozzle. The diameter and number of strand extrusion nozzles of the die head 1 are appropriately determined according to the diameter and number of the strands S.

Below the die head 1, a conveyor device 3 which also serves as a guide device for the strand S is arranged. In this conveyor device 3, a single endless conveyor belt 5 is vertically stretched and is stretched between abandoned belt wheels 4 and 4, and either or both belt wheels 4 are driven. At this point, it is desirable to drive the strand S in accordance with the extrusion conveying speed.

The conveyor belt 5 of the conveyor device 3 having the required length is water-permeable, and is a mesh belt such as a net, a chain, and a perforated hole, and is arranged below the die head 1. At this time, as shown in the figure, the strands S extruded from the die head 1 are naturally guided and transferred to the outward side of the conveyor belt 5 at a predetermined required angle. The inclination angle of the conveyor device 3 is a steep inclination angle from a nearly vertical state to about 70 degrees. As a result, the strands extruded from the die head are aligned and guided along the conveyor device.

Further, in order to cool and solidify the melted strand S extruded from the die head 1, a cooling fluid, for example, cooling water for injecting cooling fluid, for example, cooling water to the strand S, is provided on the conveyor. The cooling liquid supply pipes 7 are arranged in the lateral direction of the device 3 and in a plurality of upper and lower stages, and a plurality of nozzles 7N are provided at predetermined intervals in the longitudinal direction of the cooling liquid supply pipe 7, that is, the strand width direction, and are extruded and transferred. The cooling liquid is sprayed onto the strands S almost uniformly.

In the jet of the cooling liquid, the cooling liquid supply pipe 7 is arranged so that the entire surface of the strand is uniformly cooled and the strand is cooled in a short time. For example, at the position above the upper belt wheel 4 as in the illustrated embodiment, at the back position of the conveyor belt 5 so that the cooling liquid can be jetted toward the back surface of the strand that flows down at the back position of the conveyor belt 5, At the position between the belt wheels 4 and 4, one or more stages of cooling liquid supply pipes 7 are arranged on the surface of the conveyor belt 5 on the forward path side, whereby cooling liquid can be jetted from both the front and back sides of the strand. And

Inside the conveyor device 3, one or more suction removing means 6 are arranged. The suction / removal means 6 has a box shape, is as close as possible to the back side of the conveyor belt 5 on the outward side, and has the required width over the width of the conveyor belt in the lateral direction. A suction slit 9 is formed on the surface to be sucked, and a discharge pipe 8 is connected to the suction removing means 6. As a result, the cooling liquid sprayed from the nozzle of the cooling liquid supply pipe 7 collides with the conveyed strand, passes through the mesh-shaped conveyor belt, and is sucked into the suction removing means 6 through the suction slit 9. It is guided to the outside through the discharge pipe 8.

Although not shown in the drawing, a cooling device is connected to the discharge pipe 8, the cooling liquid is cooled by this cooling device, and then again supplied to the cooling liquid supply pipe 7 via a pump or the like to the strand. It is used by injecting and circulating.

A cutting device 15 is arranged below the conveyor device 3. The cutting device 15 cuts the cooled and solidified strand S into chips P or pellets having a required size, and includes a housing 10 having a required shape, and a pair of nip rolls 11 housed in the housing 10. , Fixed blade 12 and rotary blade 13.

Two nip rolls 11 are used as a pair, and the strand S transferred along the conveyor device 3 is sandwiched between the nip rolls 11 and 11 at a position outside the conveyor belt 5, and the nip rolls 11 are sandwiched between the nip rolls 11 and 11. The strand S is pulled down by the rotation of, and the pulled down strand is supplied between the fixed blade 12 and the rotating blade 13, and the rotating blade 13 continuously rotates to a predetermined size. It is cut into chips or pellets.

Further, a supply pipe 17 for supplying a cooling liquid is arranged in the housing 10 so that the cut chips P and the like are further cooled and supplied into the transfer chute 16 connected to the housing 10. ing. Therefore, in the transport chute 16, the cut chips P and the like are transported down along with the cooling liquid.

In the strand water-cooled transporting device configured as described above, the strand S extruded from the die head 1 is transported along the conveyor belt outward side surface of the conveyor device 3 together with the driving of the belt. At this time, the cooling liquid is sprayed to the strand S on the conveyor by the cooling liquid supply pipe 7, and is cooled and solidified when the strand flows down. After cooling the strand, the cooling liquid is sucked by the suction removing means 6 in the conveyor device.

The cooled and solidified strand S is pulled between the nip rolls 11 and 11 and supplied between the fixed blade 12 and the rotary blade 13, cut into chips, and supplied into the housing 10 of the cutting device 15. It is transported in the transport chute 16 together with the cooling liquid. Thus, the strands continuously extruded are conveyed while being sucked on the water permeable conveyor while being flown, cooled and solidified, and can be continuously cut into chips with uniform quality.

In the above-mentioned configuration, the case where the plastic is a strand-shaped molten resin has been described, but it goes without saying that the sheet-shaped molten resin can be conveyed and used for a sheet cutter.

[0020]

[Effect of device]

 According to the strand cooling / conveying device of the present invention, the strands are positively conveyed by the conveyor device, so that the strands can flow in a smooth and orderly manner, so that the chip size and shape can be made substantially uniform. In addition, the quality of the chips can be improved, the strands will not be cut during the run down, the production efficiency will be improved, and even if a cutting accident occurs on the way, it will always be sent to the cutting device automatically and reliably. Therefore, there is an advantage that labor saving and unmanned operation can be achieved. According to the second aspect of the present invention, there is an advantage that the water is conveyed while being sucked on the water permeable belt, and the cooling water is exchanged on the way, so that the cooling effect is improved and the production efficiency is also improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a cooling and conveying device for a strand of the present invention.

[Explanation of symbols]

 S Strand P Chip 1 Die head 3 Conveyor device 5 Conveyor belt 6 Suction removing means 9 Suction slit 10 Housing 11 Nip roll 12 Fixed blade 13 Rotating blade 15 Cutting device

Claims (2)

[Scope of utility model registration request] 1. A device in which a molten strand extruded from a die head is flowed down along a conveyor device to be cooled and solidified and cut into chips by a cutting device,
A conveyor device that conveys the strand from the die head to the cutting device is arranged below the die head, and is constructed by stretching a conveyor belt having water permeability between belt wheels arranged above and below, along with this conveyor belt. A cooling and conveying device for a strand, characterized in that suction-removing means for sucking a cooling fluid after cooling the jetted strand with respect to the flowing-down strand is arranged on the inner surface of the outward side of the conveyor belt. 2. The conveyor device arranged in the die head / cutting device is arranged at a required inclination angle suitable for guiding and flowing down the melted strands extruded from the die head. The strand cooling and conveying device according to claim 1.