JP3062040U - Cooling length and cooling temperature control device for thermoplastic resin strand - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] To adjust the cooling length by changing the band length of the strand with the cooling water. A guide device (3) has a plurality (four) of downflow chutes (4) disposed in a downflow direction.
Are provided with a plurality of mesh guide chutes 50 that are superposed in a back-to-back relationship with the adjacent down chute 4 and allow cooling water to permeate in the direction of gravity.
0 is moved in the flowing direction or the upstream direction, respectively, and the cooling length L is adjusted by adjusting the overlapping length of the falling chutes 4 adjacent in the flowing direction, and the length of the transmission mesh is adjusted by adjusting the length of the transmission mesh. The length of the belt with the cooling water is adjusted by an air cylinder 101 or the like, and a temperature measuring means 43 is provided at the lower end of each falling chute 4 and at the permeated water discharge port 52 of the mesh guide chute 50, and is cooled by a temperature set value. The water fountain 40 is provided with control means 45 for gradually controlling the outflow speed, the flow rate, and the cooling water temperature in the flowing down direction.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for cooling and cutting a strand. More specifically, a group of strands made of a molten thermoplastic resin is extruded from the nozzle row of the die head, cooled and solidified while flowing down along with the cooling liquid on the in-house equipment, and then cut into pellets (chips) by the strand cutter. About what you do.

[0002]

[Prior art]

 When manufacturing chips, which are the raw materials of thermoplastic resin products, a molten strand made of thermoplastic resin is extruded from a die head and cooled and solidified while flowing down with cooling water on a downflow chute. In, while cutting down by nip roll, cut into chips by rotary cutter. By the way, appropriate strand cooling depends on the length of cooling, the temperature, amount and speed of cooling water.

In addition, there are a plurality of downflow chutes for guiding the strand (S) in the downflow direction, and the cooling water fountain is cooled and guided with means for controlling the outflow speed, the flow rate, and the cooling water temperature in accordance with the downflow direction. A number of methods and apparatus have been disclosed by the applicant, for example, in Patent Application No. 2557725.

[0004] A great deal of effort has been made in measuring the temperature of the chip and controlling the temperature of the chip. Among them, the applicant of the present invention has disclosed many such as Japanese Patent Application No. 8-357182. The idea of temperature control has been proposed.

[0005] In addition, the method of transporting the strand group during cooling includes a method of simply immersing in the cooling water filled in the cooling tank, a method of transporting the cooling water while holding it with a belt or the like, a guide surface. A number of methods have been proposed, such as a method of transporting the cooling water together with cooling water, and a method and an apparatus for adjusting the cooling length in each of these methods have been proposed by the applicant. For example, there are Japanese Patent Publication No. 7-106568 and Japanese Patent Publication No. 7-80179 as methods for adjusting the cooling length. These documents fully describe the necessity of adjusting the cooling length of the strand in the strand cutting method. And a method apparatus is disclosed.

[0006] However, there has not been found any one which simultaneously controls the cooling length and controls the temperature of the cooling water.

[0007]

[Problems to be solved by the invention]

 A group of discharged thermoplastic resin strands is cooled along with the cooling liquid on the smooth guide surface (however, the flow of the cooling water is intended to be smooth and does not mean any irregularities such as guide grooves). In the method of cooling and solidifying while flowing down together, the cooling length of the strand is adjusted by adjusting the distance between the strand and the cooling water, and a new method is provided in which the strand cutter is directly connected immediately after the cooling guide device It is intended to do so. In addition, the present invention adds a technical idea to increase the flow rate of the cooling water to the above-mentioned method, and makes the flow rate of the cooling water positively correspond to the increase in the flow rate of the strand on the guide device. When the thermoplastic resin strand flows down along with the cooling water, the length (distance) of the band is adjusted to solve the problem of the chip manufacturing equipment, and the chip can be easily formed into a predetermined shape in a short time. It is an object of the present invention to provide an apparatus for obtaining a thermoplastic resin chip that can be used.

The present invention solves the above-mentioned problems of the conventional thermoplastic resin chip manufacturing apparatus, and provides a thermoplastic resin chip temperature control apparatus that can easily form a chip into a predetermined shape in a short time. The purpose is to:

[0009]

[Means for Solving the Problems]

 In order to solve the above problem, in order to eliminate the floating of the strand group without cooling or leaving the strand group separated from the cooling water, the strand group made of the thermoplastic resin in the molten state is extruded from the nozzle row of the die head, and is inclined. The cooling guide device (3) cuts the pellets with a strand cutter after cooling and solidifying while flowing down the cooling device together with the cooling liquid. The cooling guide device (3) includes a falling shoot (4) for guiding the strands. A plurality of flow-down chutes adjacent to each other in the flow-down direction are overlapped in a back-to-back relationship, and the flow-down chutes (4a, 4b, 4c, 4d) are moved in the flow-down direction. The mesh guide short (50) that allows the cooling water to permeate in the direction of gravity is provided in the downstream portion of the cooling guide device (3) while adjusting the superposition of the cooling guide device (3). A plurality of mesh guide chutes are overlapped in a back-to-belt relationship, and the mesh guide chutes are moved in the flowing direction or the upstream direction, respectively. ) Is adjusted, and the strand cutter is moved in the downstream direction in response to this adjustment.

[0010] Further, a detector (temperature sensor) (43) for measuring the temperature of the cooling water is provided at the lower end portion of each downflow chute and the permeate discharge port (52) of the mesh guide chute, and the cooling guide is set according to the temperature set value. A control means (45) for gradually controlling the outflow speed, the flow rate, and the cooling water temperature in the plurality of cooling water fountain ports (40) of the apparatus (3) in the downflow direction is provided. During the cooling of the strand, that is, during the discharge of the thermoplastic resin to be melted, the product of the instantaneous velocity and the instantaneous sectional area of the strand during the cooling is substantially constant. Therefore, in order to increase the flow rate of the cooling water on the downflow chute in proportion to the instantaneous velocity of the strand or in inverse proportion to the instantaneous cross-sectional area of the strand, cooling is performed on each downflow chute. An outlet for discharging the liquid may be provided, and the flow speed of the cooling liquid from the outlet may be higher on the downstream side in response to the increase in the flow speed of the strand on the guide device.

[0011] Further, in order to solve the above-mentioned problem of the temperature control, the temperature control device for a thermoplastic resin chip of the present invention uses a plurality of outlets (40a, 40b) have flow control valves (44a, 44b, 44c...) That increase the water volume as they go to the downstream forcibly and the water temperature changes. The nipple (16) and the fixed cutter (17) In a cooling and cutting apparatus for strands, which is cut by a cutting device (14) equipped with a rotary cutter (18), a temperature sensor (43) installed at the lower end of each falling chute and a permeate discharge port (52) is connected. Control means (45) for gradually controlling the outflow speed, flow rate, or cooling water temperature in the plurality of cooling water fountains (40) of the cooling guide device (3) in the flow-down direction according to the temperature set value. It is characterized by.

[0012] Furthermore, there is provided a temperature measuring means (19) for measuring the temperature of the chip downstream of the cutting device (25), and the plurality of cooling water fountains (9) of the cooling guide device (3) are controlled according to the temperature set value. Control means (45) for gradually controlling the outflow speed, the flow rate, and the cooling water temperature according to the flowing direction is provided.

[0013]

[Embodiment of the invention]

 Hereinafter, an embodiment of the apparatus for adjusting the cooling length and cooling temperature of the thermoplastic resin strand of the present invention will be described in detail with reference to FIG. FIG. 1A is a side cross-sectional view showing the adjustment of the movement of the falling chute, and shows that the overlapping of the falling chute is small, that is, the cooling length L2. FIG. 1B is a side cross-sectional view showing the adjustment of the movement of the falling chute, and shows a large overlap of the falling chutes, that is, the cooling length L1. In a strand granulator for extruding a group of molten thermoplastic resin from a die head or the like and cooling and solidifying it while flowing down with a cooling liquid on a guide device, a strand granulator for cutting the group of strands with a cutting device is used. (3) is provided in the upstream part of the downflow chute (4) for guiding the strand (S) together with the cooling water in the downflow direction, and the next downflow chute (4a, 4b, 4c, 4d. ..) are superimposed in a back-to-back relationship, and a plurality of mesh guide chutes (50) for allowing cooling water to pass in the direction of gravity are provided at a downstream portion of the cooling guide device, and the respective mesh guide chutes (50a, 50b, 50c) is overlapped in a back-to-back relationship, and the downstream chute is moved in the downstream direction or upstream direction, respectively, so that The overlapping length of the mesh guide chute adjacent to the downstream direction is adjusted, and the mesh guide chute on the upstream side is moved in the upstream direction or downstream direction, respectively. At the same time, a detector (temperature sensor) for measuring the temperature of the cooling water is provided at the lower end of each downflow chute and the permeated water discharge port (52) of the mesh guide chute, and a cutting device (strand cutter) ( 14) There is a temperature measuring means (43a, 43b, 43c, 43d) for measuring the temperature of the chip at a downstream portion from the plurality of cooling water fountains (40a, 40b) of the cooling guide device (3) depending on the temperature set value. ...), and a control means (45) for gradually controlling the outflow speed, the flow rate, and the cooling water temperature in the flowing direction.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIG. In a strand granulator that extrudes a group of melted thermoplastic resin from a die head or the like, solidifies it while flowing it down with a cooling liquid on a guide device, and cuts the group of strands with a cutting device, FIG. Reference numeral 1 denotes a die head, which is connected to a batch polymerization pot (not shown). The die head 1 is provided with a large number of die nozzles, and a strand group made of a molten thermoplastic resin is extruded from each nozzle row. Reference numeral 3 denotes a guide device for guiding the strands (S) extruded from the die head (1) together with the cooling water of the cooling liquid while guiding them, and the guide device 3 comprises a plurality of flow-down chutes (4) (embodiments). , Four (4a, 4b, 4c, 4d).

An outlet 40 (40a, 40b, 40c, 40d) for ejecting cooling water is provided integrally at the uppermost stream portion of each falling chute 4, and a downstream end is provided with cooling water flowing down. The cooling water is directed to the direction in which the cooling water flows down along the surface of the falling chute 4, following the shooter tip that is released and transferred to the downstream (next flow) falling chute. The cross section of the falling shoot 4 may be provided with a number of guide grooves slightly larger than the number of the strands S discharged from the die head 1 in parallel, or may be simply flat. As shown in FIG. 2, the downstream chute 4a on the upstream side is slidably overlapped (overlaid) on the downstream chute 4b of the next flow.

In order to adjust the speed and flow rate of the cooling water ejected from the slit (gap) of the outlet 40 of each falling chute 4, each falling chute 4 is integrally provided with a cooling water storage section. The cooling water is supplied to the cooling water storage via adjustment valves (44a, 44b, 44c, 44d, respectively) for adjusting the pressure and flow rate of the cooling water. The opening thickness (opening area) of the outlet 40 of each falling chute 4 is the instantaneous velocity of the strand S flowing down (the product of the instantaneous velocity of the strand S flowing down and the instantaneous cross-sectional area or thickness is substantially constant; Resin properties, discharge conditions, number of discharges, etc., so that the strand S does not slip on the surface of the downflow chute 4 to disturb the downflow, corresponding to the instantaneous velocity, the instantaneous cross-sectional area becomes smaller. In consideration of the above, the downstream side is set to be smaller, and the cooling water ejection speed is set to be higher as the downstream side. Similarly, the temperature of each cooling water jetted from the outlet of each falling shoot 4 is also adjusted.

Reference numeral 14 denotes a strand cutter (or cutting device) that cuts the strands S that have flowed down the guide device 3 into pellets (chips). The housing 15 includes a housing 15 and a nip roll device 16 that pulls down the strands S. A fixed blade 17 and a rotary blade 18 for cutting the strand S pulled down by the nip roll device 16 into pellets. The nip roll device 16 includes an upper roll 16a and a feed roll 16b. The upper roll 16a is weighted with respect to the feed roll 16b and rotates following the rotation of the feed roll 16b, whereby the strand S is driven in accordance with the difference in the relative speed ratio between the feed roll 16b and the rotary blade 18. The pellets are cut into pellets having different lengths and discharged from the end of the housing 15 together with cooling water.

The guide device 3 and the strand cutter 14 are both movably supported by the bogie 20 in a downward direction (including a counter-current downward direction), and are movable together with the bogie 20. Alternatively, the entire guide device 3 and strand cutter 14 can be moved under another polymerization furnace. The carriage 20 includes a base 22 having wheels 21, a support frame 23 erected from the base 22, an inclined guide 24 fixed to the base 22 and the support frame 23, and a base 22. An elevator 27 provided so as to be able to ascend and descend via an X-type link mechanism 25 and an air cylinder 26, and a movable member 27 which is movable on the elevator 27 via an air cylinder 28 in the left-right direction (the front-rear direction of the strand cutter 14). And a movable table 29 for supporting the strand cutter 14.

By the way, as described with reference to FIGS. 1A and 1B, the downflow shoot 4 and the cooling water jet formed as an integral structure can be moved and adjusted in the downflow direction. As a device, an air cylinder 101 is used instead of a ball screw, and is held in a bottomed cylindrical holder 13a at the rear portion 13 of the support body 11. The strand cutter 14 is moved up and down and left and right by the air cylinders 26 and 28 in accordance with the moving distance of each of the downflow chutes 4, that is, the adjustment of the overlap length of the downflow chutes 4. Adjust. In this way, the cooling length of the strand S is adjusted according to the type of the thermoplastic resin, the discharge conditions, and the operating conditions, and the strand S is suitably cooled and cut into pellets by the strand cutter 14.

In the first embodiment of the present invention, an example is shown in which the downflow chute is moved by an air cylinder. However, these moving devices are moved by a chain and stopped by a ratchet wheel or by a ball screw. It may be replaced with a known device.

Further, the temperature control device for the thermoplastic resin chip increases the amount of water as the group of strands of the thermoplastic resin in the molten state is forced to go downstream at a plurality of outlets (40a, 40b...). And the flow rate control valves (44a, 44b, 44c...) That change the water temperature, and the temperature of the cooling water is measured at the lower end of each downflow chute and the permeate discharge port (52) of the mesh guide chute. A control means provided with a detector (temperature sensor) (43) for gradually controlling the outflow speed, flow rate, and cooling water temperature through the plurality of cooling water fountains (40) of the cooling guide device (3) according to the temperature set value. Step (45).

[0022]

[Effect of the invention]

 As described in detail above, according to the present invention, after the strand group is cooled and solidified while flowing down with the cooling liquid on the inclined guide device, the strand group is cut into pellets by the strand cutter. The cooling length of the strand can be adjusted with a simple operation and with a simple structure. In addition, since the falling chute is superposed, the inside of the guide device can be effectively used for the cooling liquid to flow down, and the device can be made compact without increasing the size of the device as compared with the related art. In addition, the cooling temperature of the strand can be easily set to a predetermined cooling effect in a short time, so that not only a large number of defective chips are not generated, but also the speed and amount of cooling water jetted at any time by measuring the temperature of the chips Operation, the operation is convenient, uniform chips can be obtained, the strands can be cooled and solidified almost uniformly in the downflow direction, the cooling degree of the strands is adjusted, and the temperature measured by the temperature sensor falls within the set temperature range. The strands are controlled so that the strands are cooled almost uniformly in the flowing direction, and uniform chips can be obtained, thereby improving the quality of the pellets.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing adjustment of movement of a falling chute.
(A) shows that there is little overlap of the falling chutes. (B) is a side sectional view showing the movement adjustment of the falling chute, and shows that the overlapping of the falling chute is large.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die head 3 Guide 4 Downflow chute 40 Cooling water outlet 50 Mesh guide chute 51 Permeated water receiver 14 Strand cutter 20 Cart 22 Base 23 Support frame 24 Guide 25 Link mechanism 101 Air cylinder 27 Elevating table 29 Moving table S Strand

Claims (1)

[Utility model registration claims] 1. A strand granulator for extruding a strand group made of a thermoplastic resin in a molten state from a die head or the like, cooling and solidifying the strand group together with a cooling liquid on a guide device, and cutting the strand group with a cutting device. , A plurality of cooling guide devices (3) are provided in the upstream part of the downflow chute (4) for guiding the strand (S) together with the cooling water in the downflow direction, and the next downflow chute adjacent in the downflow direction is provided in a back-to-back relation. A plurality of mesh guide chutes (50) for allowing cooling water to pass through in the direction of gravity are installed in a downstream portion of the cooling guide device, and the respective mesh guide chutes are overlapped in a back-to-back relationship, and sequentially downstream. The downstream chute is moved in the downstream or upstream direction, respectively, to adjust the superposition of the downstream chutes, that is, the cooling length (L). , Sequentially, moving the mesh guide chute on the upstream side in the flowing direction or the upstream direction, respectively,
Detection of adjusting the superposition length (M) of the mesh guide chutes and measuring the temperature of the cooling water at the lower end of each flow down chute (4) and the permeate outlet (52) of each mesh guide chute (50). Vessel (temperature sensor) (43),
Control means (45) for gradually controlling the outflow speed, flow rate or cooling water temperature in the plurality of cooling water fountains (40) of the cooling guide device (3) in accordance with the flowing direction according to the temperature set value. Cooling length and cooling temperature control device for thermoplastic resin strand.