JP3248073B2 - Hot-melt plastic crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for pulverizing hot-melt plastic discharged from a plastic extruder.

[0002]

2. Description of the Related Art Plastic films (sheets), plastic strands (fiber, yarn, string) and molded plastics are produced by heating and melting plastic and extruding it from a plastic extruder. When the material plastic is switched or when the molding process is stopped, all the remaining plastic in the plastic extruder is extruded and removed.
Further, at the time of resuming the processing, the extruded hot-melt plastic is removed until the properties of the newly injected and extruded hot-melt plastic are stabilized. The hot-melt plastic that is excluded at the time of switching, suspension, or restarting,
It is dropped and deposited in a receiving container provided below the extrusion port of the plastic extruder, cooled and solidified, cut into an appropriate size and passed through a pulverizer, where it is finely pulverized and reused.

[0003]

The hot-melt plastic that drips from the extrusion port of the plastic extruder accumulates in a receiving container to form a large molten mass, which is gradually cooled from the outside to the inside and solidified. However, it takes a considerable amount of time for the entire molten mass to cool and solidify, and the interior of the mass is subjected to high residual heat, so that it tends to deteriorate.
For this reason, quality variation occurs between the pulverized material outside and the pulverized material inside the molten mass, and the pulverized plastic cannot be reused as a regular product. And the conventional crushing device is composed of a flat rotary blade and a flat fixed blade like an electric saw, and also crushes hard solidified plastics. Generates loud noise, causing noise pollution.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a method in which a hot-melt plastic dripping from an extrusion opening of a plastic extruder is directly passed through a pulverizing device without being solidified, and finely pulverized in a semi-molten state in which plastic deformation is likely to occur due to the residual heat. It is an object of the present invention to obtain a plastic pulverized material which is solidified while cooling, has no thermal deterioration, has stable quality, and can be reused as a regular product.

[0005]

According to a first aspect of the present invention, there is provided a hot-melt plastic pulverizing apparatus comprising: a rotating body having an outer peripheral surface formed by tips of a plurality of projections; The cover 14 is composed of a surrounding cover 14 and a fixed blade 15 fixed inside the cover 14 and cooperating with the tip of the projection 11 to form a shearing action. Is provided and the times
Crossing the tip side of the protrusion 11 orthogonal to the radial direction of the rolling element 13
Slope 18 whose surface has a smaller cross-sectional area than the cross-section at the base side
Are provided around the tip of the projection 11 and the projection 11
The tip becomes a flat surface corresponding to the outer peripheral surface 12 of the rotating body 13.
And the fixed blade 15 has a flat
The first feature is that the plate has a plate shape .

A second feature of the hot-melt plastic crusher according to the present invention (claim 2) is that, in addition to the first feature, the size of the projection 11 in the rotation direction 19 of the rotating body. D
Is set to ５ or more (D ≧ 0.2 L) of the dimension L of the projection 11 in the axial direction 20 of the rotating body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a plastic extruder according to the present invention, a rotating body 13 having an outer peripheral surface 12 formed by the tips of a plurality of projections 11 below the extrusion port, and surrounds the rotating body 13. The cover 14 comprises a fixed blade 15 fixed inside the cover 14 and acting in cooperation with the tip of the projection 11 to form a shearing action. A material inlet 16 and a material outlet 17 are formed in a part of the cover 14. milling devices are provided, the material inlet 16 is kicked set by aligning just below the extrusion port of the plastic extruder.

In the present invention, straightly in the axial direction 20,
Alternatively, the plurality of protrusions 11 arranged in a spiral at predetermined intervals form a rotary blade corresponding to one rotary blade that performs a shearing action over the entire width of the fixed blade 15, and the protrusion as the rotary blade 11, the width (dimension L) is smaller than the fixed blade 15,
The tip of the projection 11 is flat according to the outer peripheral surface 12 of the rotating body 13
Surface 25, and the rotating body 1
The cross section on the tip side of the protrusion 11 orthogonal to the radial direction
A slope 18 with a smaller cross-sectional area than the original cross section
The feature is that it is. The projection 11 which is a rotary blade
Can be provided at predetermined intervals in the rotation direction 19 so as to cooperate with a fixed portion of the fixed blade 15 in a superposed manner. Therefore, as shown in FIG. 1, one piece may be planted on the rotating body 21 so as to follow the zigzag (zigzag) in the rotating direction 20, or as shown in FIG. The module 22 having the plurality of protrusions 11 formed by processing may be fixed to the rotating base 21.

The slope 18 at the tip of the projection 11 is
The side that continues from the flat surface 25 at the tip to the fixed blade 15
It is good to attach to the surface. In the present invention, “to attach a slope 18 to the tip of the projection 11 in which the cross section on the tip side of the projection 11 orthogonal to the radial direction of the rotating body 13 has a smaller cross-sectional area than the cross section on the root side” is simply described. "that the projections 11 trapezoidal <br/>" speaking, that means "be shaped corners of the upper end it is cut" speaking in longitudinal section.

[0010] into the slot 16 and the cover interior 14, plus
Hot melt plastics 24 extruded from a tick extruder
Humidifiers such as a spray spray or a water spray nozzle for preventing humidification and fusion to the projections 11 and the fixed blades 15. If necessary, the entire crushing device for a plastic extruder is placed in a water tank. The rotating body 13 can be placed in the immersion state by being installed. The input port 16 is set immediately below the extrusion port of the plastic extruder, and the hot-melt plastic 24 extruded from the plastic extruder hangs down to the input port 16, and the projections sequentially rotate from the lower end of the hot-melt plastic 24 that hangs down. 11 and is subjected to a shearing action between the projection 11 and the fixed blade 15 to become a crushed material 23. In order to make the size of the pulverized material 23 uniform, the material take-out port 17 may be constituted by a screen having a plurality of through holes. In this case, the pulverized material 23 is discharged from the through hole of the screen (17) and taken out. Will be. Therefore, the size of the through hole of the screen of the outlet 17 is appropriately set according to the size of the crushed material 23 to be crushed and taken out.

In the crushing apparatus shown in FIGS. 1 and 3, two fixed blades 15a and 15b are provided, but the number thereof may be three or more. It can also be provided at a position facing the protrusion 11. Protrusion 1
The tip of 1 is a flat flat surface 25 or a flat curved surface 25 having a curvature corresponding to the outer peripheral surface of the rotating body, and the dimension D of the projection 11 in the rotation direction 19 of the rotating body The distance between the protrusion 11 and the fixed blade 15 is not less than one-fifth of the dimension L (D ≧ 0.2 L).
It is good to pulverize by cutting 4 and rotating body 13
The rotation speed of the tip of the projection 11 is 250 to 500.
m / min.

[0012]

According to the present invention , the plastic 24 is subjected to a shearing action between the tip of the rotating projection 11 and the fixed blade 15, but the portion of the tip of the projection 11 that protrudes to the left and right (in the axial direction) is removed. Since it is caught by the fixed blade 15 and cut apart, it is not subjected to a shearing action, and breakage of intermolecular bonds of the plastic 24 during the pulverization process is reduced.

The hot-melt plastic 24 that drips from the plastic extruder does not accumulate to form a large molten mass, and is subjected to the residual heat and easily deformed plastically. Only by acting, the material can be pulverized so as to be shredded between the projection 11 and the fixed blade 15, and in the process, there is no noise, no alteration due to residual heat, the quality is stable, and the regular The plastic pulverized material 23 that can be reused as a product is efficiently obtained.

Further , since the rotating blade which meshes with the fixed blade 15 is not a flat plate having the same width as the rotating body but a small-width projection 11, the stress between the fixed blade 15 and the projection 11 is reduced by the heat melting plastic 2.
The pulverization efficiency is high because the pulverization is performed by intensively acting on No. 4. In addition, since the pulverization is not performed after cooling and solidifying but in a semi-molten state and soft and easily deformed plastically, a small-sized pulverizer with less power is sufficient even if the plastic 24 to be pulverized is large. The mechanical vibrations generated during the grinding are also small, so that there is no noise and no pollution problem.

The fracture fragments 26 staying in the cover 14 without being discharged from the screen (17) at its grinding process, are stirred in the rotating body 13, it tends to scatter from the gap 27 between protrusions 11, 11, plastic extruder The broken pieces 26 scattered and adhered to the hot-melt plastic 24 that hangs down from the hot-melt plastic 24 are easily caught by the tip of the projection 11 and easily torn, so that the crushing efficiency is increased,
A plastic pulverized material 23 having a uniform particle size and easy to reuse can be obtained.

In particular , when the inclined surface 18 is attached to the tip of the projection 11 and the hot-melt plastic 24 adheres to the fixed blade 15, a part of the hot-melt plastic 24 is attached to the tip of the projection 11. It easily protrudes and adheres in a cap shape, and wind pressure or centrifugal force acts on the protruding portion 28 due to rotation of the rotating body 13, and at this time, the protrusion 11 crosses the tip side.
Slope 18 whose surface has a smaller cross-sectional area than the cross-section at the base side
Is attached to the tip of the projection 11, and since the projection 11 has a so-called pointed shape, the broken pieces 26 peel off from the projection 11 so as to remove the cap. For this reason, the plastic 24 in the heat-melted state does not accumulate on the protrusions 11 and the pulverizing action is not hindered.

As described above, the protruding portion 28 of the fragment 26 attached to the tip of the projection 11 in a cap shape is formed by the rotating body 1.
Since the rotation direction 19 is easy to receive the wind pressure due to the rotation of 3, the broken pieces 26 are easily peeled off from the projections 11.

The protrusion 11 in the rotation direction 19 of the rotating body
The dimension D is the dimension of the protrusion 11 in the axial direction 20 of the rotating body.
When the ratio is set to 1/5 or more of the modulus L (D ≧ 0.2 L) , the protrusion 1
Hot-melt plastic 24 adhered to a flat surface 25 at the tip of 1
Is rubbed by the fixed blade 15 and rolled on the flat surface 25 at the tip of the protrusion 11 to form a thin film 29. Since the thin film 29 is formed, the film is easily cracked in the process of peeling off from the protrusion 11 together with the protruding portion 28. As a result, the pulverized material 23 is more easily subdivided.

Then, the fixed blades 15a and 15b are rotated in the rotation direction.
When a plurality of fixed blades 19 are provided at intervals,
Fragment 2 crushed into 5a and adhered to the tip of projection 11
6 is divided at the same time when it is peeled off by the next fixed blade 15b, and there is no possibility that the broken pieces 26 accumulate in the projections 11 and hinder pulverization.

Also, from the inlet 16 to the inside 14 of the cover
Humidification equipment such as spray spray or water spray nozzle at any position
The provision of location, hot molten plastic 24 extruded from plastic extruders does not fuse to the projections 11 and the fixed blade 15, without fragmentation hinders its broken piece 26 is accumulated in the protrusions 11 and the fixed blade 15, The heat history of the pulverized material 23 in the pulverizing process is avoided, and the plastic pulverized material 23 having stable quality and reusable as a regular product can be efficiently obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a hot-melt plastic pulverizer according to the present invention.

FIG. 2 is a perspective view of a projection module of the hot-melt plastic crusher according to the present invention.

FIG. 3 is a cross-sectional side view of the hot-melt plastic pulverizer according to the present invention, in which main parts are encircled and enlarged.

DESCRIPTION OF SYMBOLS 11 Projection 12 Outer peripheral surface 13 Rotating body 14 Cover 15 Fixed blade 16 Input port 17 Outlet 18 Slope 19 Rotation direction 20 Axis direction 21 Rotating base 22 Module 23 Pulverized material 24 Hot melt plastic 25 Plane 26 Fragment 27 gap 28 protruding part 29 film

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaya Suzuki 2-7-1, Zengenji-cho, Miyakojima-ku, Osaka-shi Nippon Paper Industries Co., Ltd. (56) References JP-A-8-299831 (JP, A) JP-A Heisei 6-238661 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B02C 18/00-18/44 B29B ⁷ /00-11/14 B29B 13/00-15/06

Claims (2)

(57) [Claims] 1. A rotating body (13) having an outer peripheral surface (12) formed by tips of a plurality of projections (11), a cover (14) surrounding the rotating body (13), and a cover (14). It is constituted by a fixed blade (15) fixed inside and forming a shearing action in cooperation with the tip of the projection (11), and a material inlet (16) and a material outlet ( 17) is provided in the radial direction of the rotating body (13).
The cross section on the tip side of the projection (11) orthogonal to
The slope (18) having a smaller cross-sectional area than the cross-section is the protrusion (1).
Attached around the tip of 1), the tip of the projection (11)
A flat surface whose end corresponds to the outer peripheral surface (12) of the rotating body (13)
(25), and the fixed blade (15) extends over the entire width.
A hot-melt plastic pulverizer characterized in that it has a flat plate shape with shearing action . 2. The plastic crusher according to claim 1, wherein the protrusion is formed in a rotation direction of the rotating body.
The dimension D of (11) is in the axial direction (20) of the rotating body.
突起 of the dimension L of the protrusion (11) (D ≧ 0.2
L). The hot melt according to claim 1, wherein
Melting plastic crusher.