JPH06297453A - Method and device for cooling and transferring thermoplastic resin strand - Google Patents

Abstract

PURPOSE:To provide a cooling and conveying device of a strand which is obtained by combining cooling devices which transfer focibly the strands and are different from each other. CONSTITUTION:In a cooling and transferring method of a thermoplastic resin strand wherein thermoplastic resin is discharged in a stranded state from a die head 2, cooling water is blown against the discharged strand S and transferred under a state wherein it is accompanied by the cooling water and the strand is cooled and solidified, the primary cooling to the strand S to be pulled out by a cooling drum 10 and the secondary cooling by guide belts 15 which are pulled out in almost a tangential direction at an appropriate place of a cooling drum and form a pair of the top and bottom in succession and a cooling water system from the secondary cooling water supplying pipe 16 are performed. A transfer direction of the strand and a layout of the whole of the device are made free and miniaturized, the cooling of the strand is performed effectively and stabilized operation and chips having an excellent quality can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling and transferring a thermoplastic resin strand in a method in which a large number of strands obtained by continuously extruding a molten polymer in a string shape are cooled and then cut into strip-like chips or belets. And its device.

[0002]

2. Description of the Related Art The above-mentioned strand is made by discharging a thermoplastic resin in a string shape from a die head. A large number of strands are arranged in a line, and while being cooled and solidified, they are introduced into a cutting machine and cut. As the cooling means, there is one having a structure previously invented by the applicant of the present application, for example, Japanese Patent Application No. 2-183350 or Japanese Patent Application No. 4-61251. In addition, a method using a pair of belts for cooling and conveying the strand is disclosed in the same applicant as Japanese Patent Application No. 59-17713.
No. 4 and Japanese Patent Application No. 60-31180 are proposed. The use of the secondary cooling water in addition to the primary cooling water has been proposed, for example, in Japanese Patent Application No. 59-110447.

[0003]

However, the method of discharging the thermoplastic resin together with the cooling water onto the moving surface such as the rotating drum or the belt is an extremely useful means, but the so-called cooling length is short and easily long. It is very difficult to do it. Further, if the rotating drum is made to have a sufficient so-called cooling length, its diameter becomes large, and the die head for discharging the thermoplastic resin must be installed at a high place, which cannot be put to practical use and the running belt can be used. In order to obtain a sufficient so-called cooling length with other types, it is necessary to join the belts, and the strands are disturbed at the time of delivery of the strands at this joining portion, which makes it difficult to operate smoothly.

Furthermore, it is difficult to adjust the so-called cooling length depending on the type of the thermoplastic resin, and it is inevitable that a certain type of thermoplastic resin lacks the so-called cooling length, so that a chip of appropriate quality can be obtained. Can not. That is, according to the present invention, different cooling means and cooling means for forcibly transferring the strands are combined to add or extend the so-called cooling length in the cooling means, and further, the cooling of the strands corresponding to changes such as delicate shaking of the strands is performed. It is intended to provide a transportation means. A further object of the present invention is to prevent a defective chip manufactured from a defective strand at the start of discharge from the die head from being mixed into a chip manufactured from a subsequent non-defective strand.

[0005]

A first aspect of the present invention for achieving the above object relates to a method for cooling and transferring a thermoplastic resin strand as described above, wherein the thermoplastic resin is discharged from a die head in a strand shape, and the discharged strand is discharged. In the cooling transfer method of the thermoplastic resin strand, in which the cooling water is blown onto the thermoplastic resin strand, which is moved along with the cooling drum in the state accompanied by the cooling water, and the strand is cooled and solidified, the strand sent along with the cooling drum is the cooling drum. The main point is to pull out in a substantially tangential direction at an appropriate position and continuously cool and transfer in the secondary water system by the pair of upper and lower guide belts.

A second aspect of the present invention is, in the above method, that when the strands that move along with the cooling drum are separated by the scraper and the separating roller and supplied to the guide belt that receives the supply of the second cooling water, The gist of the present invention is to move the pair of peeling rollers along the surface of the cooling drum, finely adjust the peeling position and the peeling direction of the strand with respect to the guide belt, and supply the strand to the guide belt.

A third aspect of the present invention relates to an apparatus for carrying out the first aspect of the present invention, in which a thermoplastic resin is discharged from a die head in a strand shape, cooling water is sprayed on the discharged strand, and the cooling water is accompanied. In a cooling resin transfer device for a thermoplastic resin strand that moves along the cooling drum in a state and cools and solidifies the strand, a peeling roller and a scraper pair are provided to draw the strand in a tangential direction at a proper position of the cooling drum. , A pair of upper and lower guide belts is provided in the downstream direction, secondary cooling water separate from the cooling water flow to the cooling drum is supplied into the guide belts, and the strand group is transferred together with the cooling water, The main idea is to guide katsushi.

In a fourth aspect based on the third aspect, the strand moving along with the cooling drum is peeled off by a scraper and a peeling roller and supplied to a pair of guide belts, and at the same time, the scraper and the peeling roller are peeled off. The roller is attached to a support arm that rotates about the rotation axis of the cooling drum to form an integral structure, and the rotation of the support arm moves the scraper and peeling roller pair according to the surface of the cooling drum.
The gist is that the peeling position and the peeling direction of the strand can be finely adjusted with respect to the cooling drum.

A fifth aspect of the invention is the gist of the third or fourth aspect of the invention, in which a defective strand selecting / discharging means for discharging defective strands is provided in front of the guide belt.

A sixth invention is the invention according to the third, fourth or fifth invention.

6. The gist of the present invention is to cool the strand by providing a new means for supplying the third cooling water from the scraper together with the secondary cooling water supplied from the front of the guide belt.

[0011]

[Operation] Strands of thermoplastic resin discharged from the die head are first cooled by being blown with cooling water and transferred along with the cooling water along with the cooling drum to reach below the cooling drum. . Then, the strand group is once stripped using a stripping roller and a scraper pair, guided along a pair of upper and lower guide belts with the secondary cooling water, transported while further cooling, and sent to the strand cutting device in the next step.

[0012]

[Examples] FIG. 1 is a schematic longitudinal explanatory view showing a first embodiment of the present invention. A thermoplastic resin strand cooling / transferring device 1 of the present invention includes a die head 2 for discharging a thermoplastic resin in a strand form, and a primary cooling unit 3 mainly including a cooling drum 10 arranged below the die head 2. The stripping roller 4 and the scraper 5 which are arranged below the cooling drum 10 and make a pair so as to draw out the strand S which moves along the cooling drum 10 in the tangential direction with respect to the cooling drum 10.
And a secondary cooling section 6 for the strand S separated by the scraper 5.

The primary cooling unit 3 has a cooling water jet nozzle 11 for showering cooling water to the discharged strand S, a shower nozzle 12, and a cooling drum 3. 13 and the strand S
Moves along with the cooling drum 10 together with the cooling water. The cooling by the primary cooling unit 3 is the same as the cooling procedure by the conventional cooling drum, and the description thereof will be omitted.

The peeling roller 4 and the scraper 5 are provided slightly forward of the lower side of the cooling drum 10 (strand supply side), and the secondary cooling unit 6 has a pair of upper and lower guide belts 15 and a secondary belt on the guide belt 12. The guide belt 15 is composed of a cooling water supply pipe 16 for discharging cooling water, and the guide belt 15
The cooling water supply pipe 16 is provided at a lower position to receive the strand S separated by the above, and the cooling water supply pipe 16 is attached to a position where the cooling water is jetted toward between the upper and lower belts.

The guide belt 12 is preferably a cooling zone L1 (hereinafter referred to as a primary cooling zone) of the primary cooling section 3 formed by the cooling water jet nozzle 4 and the shower nozzle 5.
Secondary cooling zone L that is almost the same as or longer than
Have a length that forms 2. For this reason, the illustrated example shows an example in which the upper and lower belts are paired with two pairs of front and rear belts, and the rear end of the upstream upper belt 15a is extended from the rear end of the lower belt 15b, thereby The structure is such that the upper and lower seams of the front and rear belts are shifted to prevent the occurrence of strand disorder at the seam of the front and rear belt pairs. Of course, a pair of upper and lower belts having a length that forms the cooling zone L2 may be used. Reference numeral 7 denotes a strand cutting device provided behind the guide belt 12.

In the above structure, the strand S fed from the die head 2 is primary cooled in the primary cooling zone L1 by the cooling water jet nozzle 11 and the shower nozzle 12 while being transferred along with the cooling drum 10, and is cooled. It reaches below 10 and is separated from the cooling drum 10 by the scraper 5 and supplied to the guide belt 15. At the same time, secondary cooling water is jetted from the cooling water supply pipe 16 to the guide belt 15, and is secondary cooled in the secondary cooling zone L2 by the new cooling water. By this, cooling is surely performed, the strands are fixed, sent to the cutting device 7, cut into short chips, transferred with cooling water, and separated from the cooling water by an appropriate means and taken out.

Next, FIG. 2 shows a second embodiment. In the above embodiment, the peeling roller 4 and the scraper 5 are provided substantially below the cooling drum 10. However, the cooling transfer device 20 of this embodiment has the peeling roller 4 at the lateral position of the cooling drum 10.
a and a scraper 5a are provided, and the cooling drum 10
The secondary cooling zone L1a is made shorter and smaller than that of the above-mentioned embodiment, and the guide belts 21 and 2 paired therewith as the secondary cooling section 6a are provided thereunder.
The next cooling water supply pipe 22 is provided. Also in this case, it is preferable that the length of the guide belt 21 is substantially the same as that of the primary cooling zone L3 by the cooling drum 10 or a length that forms a slightly longer secondary cooling zone L4.

The present embodiment is advantageous when the strand S is relatively thin and cooling is performed early. In the illustrated example, the guide belt 21 is composed of a pair of upper and lower endless belts, but a plurality of belts may be combined as in the above embodiment.

Next, FIGS. 3 and 4 show a third embodiment. In the present embodiment, the mounting positions of the peeling roller 4 and the scraper 5 can be adjusted in the first embodiment, and the adjusting device 30 is a support that rotates about a rotation axis 31 of the cooling drum 10. The peeling roller 4 and the scraper 5 are supported on the arm 32, the notch gear 33 centering on the rotation axis 31 is attached to the support arm 32, and the drive gear 34 connected to an appropriate drive device (not shown) is attached to this. The support arm 32 is engaged with the support arm 32 to rotate the support arm 32 and the strand S to the guide belt 15.
Finely adjusting the peeling position and the peeling direction of the guide belt 1
5, the strands are supplied to the guide belt 5, and even when the mounting position of the guide belt 15 is changed (for example, the position of the second embodiment), the positions of the peeling roller 4 and the scraper 5 can be adjusted to the positions corresponding thereto. It was done. In this case, it goes without saying that the length of the guide 13 is appropriately selected.

Next, FIGS. 5 and 6 show a fourth embodiment. At the start of normal manufacturing, defective strands are extruded from the die head 2. In the present embodiment, this defective strand is discharged to the outside of the strand traveling path. The figure shows the defective strand discharging means 40 applied to the cooling device 1 of the first embodiment. The means 40 slides on both sides of the movable chute 41 disposed between the peeling roller 4 and the guide belt 15 and the shout 41 so as to guide the movement of the chute 41 in the direction perpendicular to the flow direction of the strand S. A guide plate 42 that movably supports and a forward / backward movement cylinder 4 that is attached to the rear end of the shout.
3 and 3.

As a result, when the defective strand is fed out at the start of manufacturing, the retractable position 41 in which the movable sheath 41 is retracted from the flow passage of the strand S by the cylinder 43.
withdraw to a. As a result, the defective strands fall without moving to the guide belt 15 side. Although not shown, this strand is stored in an appropriate storage box. And after the extruded strands are in good condition,
The cylinder 43 is operated to move the movable shout 41 forward and push it to the guide position of the strand S. As a result, the strand S is guided by the movable short 41 and the guide belt 1
Transferred to side 5.

Next, FIGS. 7 and 8 show a fourth embodiment. In this embodiment, the peeling roller 4 is replaced with a cooling water jetting structure, and the peeling roller 50 includes a hollow main body 51 and
The main body portion 51 includes a support portion 54 which is continuously provided in both ends in the axial direction and is supported by a support wall 52 via a bearing 53, and is rotationally driven by a gear portion 55 formed on the support portion 54. A large number of outflow holes 56 for ejecting cooling water are formed in the main body 51. Reference numeral 57 denotes a cooling water supply pipe, and a fixing portion 58 inserted into the main body portion 51 is formed with a supply port 59 for flowing out the cooling water into the main body portion 51 over the entire length.

When the peeling roller 50 is used, the primary cooling water accompanying the strands sent along the cooling drum is squeezed by the roller and new cooling water can be sprayed on the peeled strands. The strands can be cooled effectively.

Next, FIG. 9 shows a modification of the scraper. This scraper 60 is hollow, has a water storage chamber 61 inside, and has a cooling water supply pipe 62 connected thereto, and a discharge port 63 at the rear end. The cooling water (hereinafter referred to as the tertiary cooling water) that is perforated and supplied from the supply pipe 62 is jetted to the strand S separated from the discharge port 63.

In the case of this structure, the peeling roller 5
Similar to 0, the peeled strand S can be effectively sprayed with cooling water to be cooled.

[0025]

As described above, according to the present invention, the strand discharged from the die head is sent along with the cooling drum which rotates together with the primary cooling water to cool in the primary cooling zone, and then the proper place of the cooling drum. The stripping roller and the scraper pair are used to strip the strand,
Guided by a pair of upper and lower guide belts, the secondary cooling zone is cooled by the secondary cooling water, and the running of the strands can be controlled to obtain appropriate water cooling, and stable operation can be achieved. You can get good quality chips as well. Further, the diameter of the cooling drum can be made relatively small, and the entire apparatus can be downsized. Further, by supporting the scraper and the peeling roller on an adjusting device and swingably around the rotating shaft of the cooling drum, it is possible to finely adjust the peeling position or the peeling direction of the strand with respect to the guide belt. it can. Furthermore, when the strands separated from the cooling drum are supplied to the guide belt, the defective strand discharge means is provided, so that the defective strands at the start of strand discharge can be selectively discharged to the outside of the strand traveling path. Therefore, only good strands can be supplied to the cutting device via the guide belt, and it is possible to prevent defective products from being mixed in the formed chips. Furthermore,
By providing the cooling water jet port on the scraper, the insufficiently cooled strands separated by the scraper can be immediately and effectively cooled and supplied to the guide belt.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the outline of the entire first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the overall outline of a second embodiment.

FIG. 3 is a front view of a scraper and peeling roller adjusting device of a third embodiment.

4 is a right side view of the adjusting device in FIG. 3. FIG.

FIG. 5 is an explanatory view of a procedure for attaching defective strand discharging means.

FIG. 6 is a plan view of the defective strand discharging means.

FIG. 7 is a vertical cross-sectional view of another embodiment of the peeling roller.

FIG. 8 is an explanatory view of a mounting procedure of the peeling roller in FIG.

FIG. 9 is a vertical sectional view of another embodiment of the scraper.

[Explanation of symbols]

 1 Cooling Device 2 Die Head 3 Primary Cooling Section 4 Peeling Roller 5 Scraper 6 Secondary Cooling Section 10 Cooling Drum 15 Guide Belt 16 Cooling Water Supply Pipe 20 Cooling Transfer Device 21 Guide Belt 22 Cooling Water Supply Pipe 30 Adjusting Device 40 Bad Strand Discharge Means 50 Peeling roller 60 Scraper

Claims (6)

[Claims] 1. A thermoplastic resin is discharged in a strand form from a die head, cooling water is sprayed on the discharged strand, and the strand is transferred along with a cooling drum with cooling water,
In a method for cooling and transferring a thermoplastic resin strand for cooling and solidifying the strand, the strand sent along with the cooling drum is drawn out in a substantially tangential direction at an appropriate position of the cooling drum, and the secondary water system is continuously drawn by a pair of upper and lower guide belts. A method for cooling and transferring a thermoplastic resin strand, characterized in that the material is cooled and transferred at the same time. 2. When a strand moving along with a cooling drum is peeled by a scraper and a peeling roller and supplied to a guide belt which receives a second cooling water, a pair of the scraper and the peeling roller is placed on the surface of the cooling drum. 2. The method for cooling a thermoplastic resin strand according to claim 1, wherein the strand is fed to the guide belt by finely adjusting the peeling position and the peeling direction of the strand with respect to the guide belt. 3. A thermoplastic resin is discharged in a strand form from a die head, cooling water is sprayed onto the discharged strand, and the strand is transferred along with a cooling drum in a state accompanied by the cooling water,
In a cooling and transferring device for a thermoplastic resin strand that cools and solidifies a strand, a peeling roller and a scraper pair are provided at a proper position of the cooling drum to draw out the strand in a tangential direction, and a pair of guides is formed in a downstream direction in a pair. A belt is provided, secondary cooling water separate from the cooling water flow to the cooling drum is supplied into the guide belt, and the strand group is transferred together with the cooling water and guided to the strand cutting device. Cooling and transferring device for thermoplastic resin strands. 4. The strands moving along with the cooling drum are separated by a scraper and a separating roller and supplied to a pair of guide belts, and the scraper and the separating roller are rotated about a rotating shaft of the cooling drum. It is attached to a moving support arm to form an integral structure, and by rotating the support arm, the scraper and the peeling roller pair are moved along the surface of the cooling drum, and the peeling position or the peeling direction of the strand can be finely adjusted with respect to the cooling drum. 4. The method according to claim 3, wherein
A method for cooling and transferring a thermoplastic resin strand as described. 5. The thermoplastic resin strand cooling / transferring device according to claim 3, further comprising a defective strand selecting / discharging means for discharging defective strands in front of the guide belt. 6. The strand is cooled by a novel means for supplying a third cooling water from a scraper together with the secondary cooling water supplied from the front of the guide belt to cool the strand. The thermoplastic resin strand cooling and transferring device described.