JPS63216710A - Cooling and chipping device of strand - Google Patents

Abstract

PURPOSE:To prevent generation of a mispellet due to adhesion of strands among them by curing the external surfaces of the strands immediately, by arranging a cooling air injection part injecting cooling air toward the strands between a die and a chopping device. CONSTITUTION:Simultaneously with extrusion of a strand S through a die 2 under a state where a main air injection part 6 is positioned on the upper part of the die 2, cooling air G is injected toward strands S through respective injection nozzles 6a... of the main air injection part 6. The external surfaces of the strands S... are cured immediately by cooling them under a state where the strands S... are floated and the flowing down direction of the strands S... is changed downward. Then in the course of the flowing down, the whole of the strands S... are cured up to predetermined hardness through which then are choppable by cooling water W to be injected through a cooling water injection nozzle 12a. Then the strands S... are chopped into a pelletlike state by a rotary blade 3b and stationary blade 3c of a chopping device 3, and the chopped pellets are sent into a dehydrator 16 along with the cooling water W for dehydration.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of the Invention The present invention relates to, for example, a strand cooling shredding device that shreds a strand extruded from a die into pellets using a shredding device while cooling the strand.

(B) Background of the Invention) As a device for cooling and shredding the strands while flowing them down, there is, for example, the device disclosed in Japanese Patent Publication No. 16806/1983. The cooling effect is higher than that of a cooling method using a water tank because it is cooled by flowing down the cooling water along with the cooling water. Since a large amount of cooling water is used, there is a problem in that even if industrial water or the like is used, the cooling cost becomes high.

In addition, when using the above-mentioned cooling water by circulating it, a circulation path and equipment such as a circulation pump are required to circulate the used cooling water to the upper part of the downstream trough. Since a cooling device such as a radiator is provided to cool the device to a predetermined temperature, the structure of the device is not only complicated but also large in size.

(C) Purpose of the Invention This invention uses air to cool the strands, thereby instantly curing the outer peripheral surface of even highly adhesive resin strands, thereby preventing the occurrence of miss pellets due to adhesion of the strands. The purpose of the present invention is to provide a strand cooling shredding device that can perform smooth shredding.

(D) Structure of the Invention The present invention is a strand cooling shredding device in which a cooling air injection unit that injects cooling air toward the strand is disposed in a cooling portion formed between a die and a shredding device. It is characterized by

(e) Function of the invention This invention extrudes the strand from a die to a cooling section, and at this cooling section, cooling air is injected toward the strand from a cooling air injection part, and the strand is cooled in a suspended state. The outer surface is immediately hardened by the cooling effect of air, and the strand is fed to a shredding device and shredded into pellets.

(f) Effects of the invention According to this invention, for example, highly adhesive l174I11
Even when the strands are cut into pieces, the outer surface of the strands is immediately cured, so that it is possible to prevent the occurrence of miss pellets due to adhesion of the strands.

Moreover, since the strands are cooled by air,
Compared to devices that use conventional cooling water, there is no need to install cooling devices such as circulation devices or radiators, and the device configuration can be simplified. Since room-temperature air is sucked in and cooled to a predetermined temperature, or is used directly as cooling air, the cooling cost is low and the device is easy to manufacture.

(g) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawings show a cooling shredding device for strands;
In the figure, this strand cooling shredding device 1 includes a die 2 of an extruder (not shown) disposed at a high position, a shredding device 3 disposed at a position lower than this die 2, and a die 2 of an extruder (not shown) disposed at a higher position. A gutter-like falling plate 4 is tilted and installed on the machine stand 5 between the trough-like falling plate 4 and the shredding device @3,
A main air injection part 6 that injects cooling air G to the strand S extruded from the die 2 and a sub air injection part 12 to be described later are arranged above and on the upper part of the downstream surface 4a, respectively. There is.

As shown in FIG. 3, the above-mentioned gutter-like downstream plate 4 includes an upper downstream plate 4b and a lower downstream plate 4 whose downstream surfaces 4a are treated with Teflon.
C, the lower end of the upper flow plate 4b is placed on the upper end of the lower flow plate 4C, and one upper flow plate 4b is placed on the upper end of the lower flow plate 4C.
A double link 7.8 is connected to the upper end of the back surface of the machine and pivoted on the machine stand 5, and the middle part of the back face is supported by a roller 9a at the upper end of the branch 9 installed upright on the machine stand 5. The upper flow plate 4b is slidably provided in the length direction of the lower flow plate 4C by holding the provided handle 7a.

As shown in FIG. 2, the above-mentioned lower flow plate 4C is formed to be narrower from the middle part in the longitudinal direction to the downstream side, and at the tip of this lower flow plate 4C, as shown in FIG. As shown in FIG. 2, a rotary blade 3b and a fixed blade 3C are disposed in the shredding chamber 3a of the shredding device a3, and a strand S is provided before the rotary blade 3b and the fixed blade 3C. It pivotally supports rollers 10 and 10 for feeding large and small feeds to the rotary blade 3b side.

Further, as shown in FIG. 3, a wire mesh 4d for cooling water W drainage is slidably stretched on the lower surface of the intermediate narrow width of the lower flow plate 4C, and the exposed area of the wire mesh 4d is provided so as to be adjustable. A drainage gutter 3d is provided at the bottom of the wire mesh 4d.

As shown in FIGS. 3 and 4, the above-mentioned main air injection section 6 supplies cooling air 〇 introduced from the air supply pipe 11 connected to the lower part of the main air injection section 6 through a plurality of air jets provided on the upper surface of the upper downstream plate 4b. Injection nozzle 6a... and injection port 6b provided on the top surface.
...and at the same time, forcefully eject it.

Note that the above-mentioned air supply pipe 11 is connected to a compressor or the like via a cooling radiator.

As shown in FIG. 4, the above-mentioned injection nozzles 6a are provided at predetermined intervals in the width direction of the upper flow plate 4b, and inject cooling air 〇 between each strand S extruded from the die 2. Then, the flow direction of each strand S is
Change to the disconnection device 3 side.

The cooling air 〇 injected from the above-mentioned injection port 6b covers the upper surface of the main air injection section 6 and prevents the strand S from adhering to the upper surface of the main air injection section 6 at the time of starting shredding.

Further, as shown in FIGS. 1 and 2, a sub-air injection section 12 for ejecting cooling air G is installed on the downstream surface 4a of the gutter-like downstream plate 4, and this sub-air injection Part 1
2 is a plurality of supply air pipes 1 extending in the width direction of the gutter-like downstream plate 4;
3... are installed in parallel, and each injection nozzle 12a... installed vertically on each supply air pipe 13... is installed in a straight line in the downstream direction at a position corresponding to the above-mentioned injection nozzle 6a... The jetting direction is set so that the cooling air G is jetted between each of the strands S flowing down.
Each strand S...prevents mutual contact.

J3, a valve 15 for adjusting the injection part of the cooling air G is provided at the connecting portion between each of the above-mentioned supply air pipes 13 . . . and the main supply air pipe 1/I on the side.

Furthermore, a cooling water supply pipe 13a is installed on the upper part of the above-mentioned wire mesh 4d.
At the same time, the cooling water injection nozzles 12b . . . , which are vertically installed on the cooling water supply pipe 13a, are set in the injection direction so as to spray cold rJI*W 1'' toward the wire mesh 4d.

When shredding a strand S with the strand cooling shredding device 1 configured in this way, as shown in FIG.・・・
At the same time, each injection nozzle 6 of the main air injection section 6
Cooling air G is injected from a... toward each strand S..., and the outer surface is cooled II1. with each strand S... suspended. ．． The strands S... are immediately cured, and the flow direction of each strand S is changed downward.

Note that the strand S flowing down onto the main air injection part 6 is
By the cooling air G jetted from the upper injection port 6b,
It is guided on the downstream surface 4a of the upper downstream plate 4b.

At the same time, each strand S extruded from the die 2...
In between, there are air injection nozzles 12a behind each...
Mutual adhesion is prevented by the cooling air G jetted from.

Each strand S... flowing down onto the downstream surface 4a of the upper downstream plate 4b is injected from each injection nozzle 12a... of the sub air injection section 12, as shown in FIGS. 4 and 5. Each strand S...
are arranged in a straight line, and each strand S flows down while being further cooled in a floating state by the cooling air G reflected on the flowing down surface 4a.

While flowing down, each strand S is entirely hardened by the cooling water W jetted from the cooling water jet nozzle 12a to a predetermined hardness that can be shredded, and then the rotary blade 3b of the shredding device 3 The pellets are shredded into pellets by the fixed blade 3C, and the shredded pellets are sent to the centrifugal dehydrator 16 together with cooling water W to be dehydrated.

In this way, the strand S immediately after being extruded from the die 2 is cooled by the cooling air G injected from the main air injection part 6 and the cooling air G injected from the auxiliary air injection part 12, so that the outside of the strand S is cooled. The surface may be adhered to the downstream surface 4a of the gutter-like downstream plate 4, or each strand S...
The strands S are immediately cured to a predetermined hardness that does not adhere to each other, and can be supplied to the shredding device 3 in a separated state, allowing smooth shredding with a stable shredding function.

Furthermore, in addition to the cooling air G of the main air injection part 6 and the cooling air 〇 of the sub air injection part 12, the cooling water injection nozzle 1
Since the strand S is also cooled by the cooling water W injected from 2a, efficient cooling can be performed, and the short gutter-like flow down plate 4
Since a sufficient cooling u1 effect can be obtained even above, the configuration of the device can be simplified and downsized.

Note that the entire downstream surface 4a of the above-mentioned trough-like downstream plate 4 may be constructed of a wire mesh, and in this configuration, the contact area with the strands S is reduced, allowing the strands to flow down smoothly.

Note that the cooling part constituting this invention corresponds to the gutter-like falling plate 4 of the above-mentioned embodiment, and the cooling air injection part corresponds to the main air injection part 6 and the sub air injection part 12. is not limited to the configuration of the above-described embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a side view of the entire cooling shredding device, FIG. 2 is a plan view of the cooling compartment d, and FIG. 3 is an enlarged longitudinal cross-section of the main parts of the cooling shredding device. The side view, Figure 4 is an enlarged plan view of the main part of the gutter-like downstream plate, and Figure 5 is the ■-■ of Figure 4.
It is a longitudinal cross-sectional view taken along the arrow line. S... Strand G... Cooling air art... Strand cooling shredding device 2... Dice 3... Shredding device 4... Gutter-like falling plate 6... Main air injection part 12... Sub air injection part

Claims (1)

[Claims] 1. A die for extruding the strand and a shredding device for shredding the strand are arranged with a predetermined distance between them, and the strand is cooled between the die and the shredding device. A strand cooling and shredding device that forms a cooling section and includes a cooling air injection section that injects cooling air toward the strands in the cooling section.