KR100837561B1 - Mixing head of screw injection molding device - Google Patents

Abstract

A mixing head of a screw injection molding device is provided to mix molten resin uniformly by employing various flow passages of molten resin so that the molten resin is divided in a micro-size. A mixing head(24) of a screw injection molding device(10) is provided inside a case(12) while cooperating with a screw(26) such that molten resin introduced through a hopper(20) provided at one side of the case is transferred and mixed. Protrusions are provided on the surface of the mixing head. The protrusions are provided in the uniform pattern on the surface of the mixing head. The area of the protrusion is reduced to one side from the other side. The protrusions have different areas. The protrusion has a rectangular shape.

Description

Mixing Head of Screw Injection Molding Device

1A and 1B show a screw-type injection molding apparatus generally used, FIG. 1A is a cross-sectional view showing a screw-type injection molding apparatus, and FIG. 1B is a cross-sectional view taken along the line A-A of FIG. 1A.

Figure 2a is a view showing a mixing head provided in the screw injection molding apparatus as Example 1 according to the present invention, Figure 2b is a view taken along the line B-B of Figure 2a.

Figure 3a is a perspective view showing a mixing head according to a second embodiment of the present invention, Figure 3b is a view taken along the line C-C of Figure 3a.

Figure 4 is a perspective view showing a mixing head according to a third embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: injection molding apparatus 12: case

14: receiving space 16: mold

18: through air 20: hopper

22: rotating means 24, 50, 60, 70: mixing head

26 screw 28 screw head

30: check ring 32: spacer

34: drive means 36: inlet groove

38: outflow groove 40: wall portion

52-1,52-2,52-3,60-1,60-2,60-3,70-1,70-2,70-3

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The present invention relates to a mixing head of a screw-type injection molding apparatus, and more particularly, to a pattern having protrusions having different shapes from each other while having a predetermined shape on the mixing head, and such patterns are continuously and repeatedly formed at regular intervals. Arranged in the form of Fractal), it prevents product overload by preventing overload of the molding apparatus and increase of melt transfer pressure due to blockage of melt flow, and mixes molten resin evenly by diversifying the flow path of melt The function and the function of finally crushing the molten resin can be more effectively exhibited.

In general, the molten resin molding technology is a method of pushing and injecting the molten resin into a mold produced in a desired shape, the screw-type injection molding apparatus is shown in Figure 1a.

As shown in the drawing, a housing space 14 is formed in the longitudinal direction inside the case 12 constituting the external appearance of the screw injection molding apparatus 10, and on one side, a molten resin is formed by a mold 16 to be described later. The through-hole 18 is smaller than the inner diameter of the receiving space 14 so as to be pushed through.

On the other side of the case 12 corresponding to the through hole 18, a hopper 20 for introducing molten resin into the accommodation space 14 is provided in a state of communicating with the inside.

In the receiving space 14, the rotating means 22 is rotatably housed so that the transfer function and the mixing function are exerted on the molten resin introduced through the hopper 20.

Looking at the configuration of the rotating means 22 in detail, the screw 26 having a predetermined length on each side with respect to the mixing head 24 disposed on one side, screw head 28, the check ring 30 , The spacers 32 are arranged in a row and connected to interlock with each other, and the rotating means 22 is connected to rotate by receiving rotational force from the driving means 34.

In particular, the inlet grooves 36 and the outlet grooves 38 are alternately formed in the concave shape on the outer surface of the mixing head 24 while forming the inclined angle in the width direction. At this time, the inner surface of the inlet groove 36 and the outlet groove 38 is formed in a curved surface, the inlet groove 36 is open in the direction of the screw 26, the outlet groove 38 is the screw head 28 Open in the direction;

On the other hand, a mold 16 is disposed on one side of the case 12 so that the molding resin injected through the through hole 18 may be injection molded, and the mold 16 shown in the drawings may understand the present invention. It is just one example to help.

In FIG. 1B, a cross section of the mixing head 24 is shown. As shown in the drawing, the wall portion 40 on either side of the wall portion 40 between the inflow groove 36 and the outflow groove 38 borders the other side. Since the height is formed lower than the wall portion 40, the inner surface of the case 12 and the clearance D is formed.

The operation of the general injection molding apparatus 10 configured as described above will be described.

As shown in FIGS. 1A and 1B, when a molten resin mass is introduced through the hopper 20 of the injection molding apparatus 10, the molten resin is along the screw 26 rotated by the driving means 34. Forward movement in the mixing head 24 direction.

The molten resin transferred as described above passes through the clearance D to be passed to the outflow groove 38 by the rotation of the mixing head 24 while being introduced into the inflow groove 36. During this time, large chunks of synthetic resin are chopped and passed to the outflow groove 38.

As described above, the molten resin that has passed to the outflow groove 38 is continuously injected into the mold 16 by receiving the pressure of the molten resin that continues to be pushed, thereby allowing injection molding.

However, as described above, the inlet grooves 36 and the outlet grooves 38 formed on the mixing head 24 exhibit the stirring and discharging functions of the molten resin, respectively, in which the inlet grooves 36 and the outlet grooves are formed. The formation of (38) is simple as shown in the figure, which does not diversify the transport path for the flow of the molten resin so that the molten resin does not mix well.

If it does not mix well, for example, when white molten resin and black molten resin pass through the mixing head 24, the white molten resin and the black molten resin exist rather than being agitated with gray molten resin. It is impossible to produce injection moldings of various colors because they are mixed in the state.

In order to solve the problem as described above, if the structure of the mixing head 24 is further complicated to change the structure so that the transfer path of the melt is diversified, the above-mentioned problem can be solved because the melt is mixed well. Eventually, in order to diversify the conveying flow of the molten resin, the conveying flow must be interrupted, thereby increasing the overload and the conveying pressure of the injection molding apparatus, thereby causing damage to the apparatus and causing product defects.

The present invention has been invented to solve the above problems, by improving the mixing head for mixing two or more kinds of molten resin to a new type, to prevent the overload and product failure of the mechanical device caused by the flow of the molten resin melted The purpose of the present invention is to make the flow path of the resin more diversified so that the stirring function of evenly mixing the molten resin and the function of finally splitting the molten resin can be more effectively exerted.

In order to achieve the above object, in the present invention, screw-type injection molding rotatably provided inside the case in a state of interlocking with the screw so as to transfer and mix the molten resin introduced through the hopper provided on one side of the case In the mixing head of the apparatus, a plurality of protrusions having a predetermined shape on the surface of the mixing head to form different areas are reduced in size from one side to the other side of the screw is formed in the form of a fractal that repeats the pattern regularly and continuously A mixing head of a mold injection molding apparatus is provided.

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Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals as in FIGS. 1A and 1B illustrating the prior art are the same elements, and thus will be omitted to avoid duplicate description.

Example 1

Embodiment 1 has a structure in which the projections 52-1, 52-2, and 52-3 having a predetermined shape on the surface of the mixing head 50 are formed in a fractal form that is repeatedly formed in a predetermined pattern.

2A and 2B show a mixing head 50 according to the first embodiment of the present invention, and the protrusions 52 having a predetermined shape (for example, having a rhombus to form different areas on the outer circumferential surface of the mixing head 50) are formed. -1, 52-2, and 52-3 form a pattern having a constant arrangement, and such a pattern is formed in a fractal form that is continuously and repeatedly formed at regular intervals, wherein the protrusions 52-1, 52-2, It is preferable that all the protruding heights of 52-3) are the same height.

Specifically, when the molten resin proceeds in the direction of the arrow, the protrusion 52-1 having the largest area is first disposed on one side of the mixing head 50 through which the molten resin proceeds, and the protrusion gradually smaller toward the other side ( 52-2, 52-3) is arranged in the form of a fractal.

However, the protrusions 52-1, 52-2, and 52-3 are not necessarily limited to, or limited to, an arrangement in a fractal form having a shape as shown in the drawing. This is only an example for description, and the protrusions 52-1, 52-2, and 52-3 are arranged in various combinations to form a predetermined pattern, and the pattern may be included in the present invention. Further, the distance between the protrusions 52-1, 52-2, 52-3, the area and the shape of the protrusions 52-1, 52-2, 52-3, etc. are variously changed according to the viscosity of the molten resin. Could be.

When the protrusions 52-1, 52-2, and 52-3 are formed in the shape of a fractal as shown in the drawing, first, the protrusions 52-1 having the largest area look at the flow path of the molten resin. By diversifying and evenly mixing, and the smallest projection (52-3) to exert the final function to split the molten resin finely the mixing effect is maximized.

For example, it is assumed that the arrow direction, which is the advancing direction of the molten resin, is the X axis, and both inclined surfaces 54-1, 54-2, 54-3 of the protrusions 52-1, 52-2, 52-3 are Assuming the Y axis, since the projections 52-1, 52-2, and 52-3 are arranged to form an angle θ or more at right angles with respect to the X axis, the flow of molten resin is blocked or transversely. Instead of clogging, two functions of dispersing the melt can be achieved while changing the flow path of the melt.

Therefore, since a constant pressure can be maintained without diversification of the flow path of the melt and the transfer pressure due to the flow, it is possible to maximize the mixing function as well as to solve all the problems of the prior art.

Other components are the same as the components described in the prior art and are omitted to avoid duplicate description.

Example 2

Embodiment 1 described above is a fractal form in which the projections 52-1, 52-2, and 52-3 formed of a rhombus form a pattern and are repeatedly continuously formed. The second embodiment is shown in FIGS. 3A and 3B. As shown in the figure, the projections 60-1, 60-2, and 60-3 formed in a rectangular shape on the surface of the mixing head 60 have a different area and a predetermined pattern in a fractal form in which the same pattern is regularly and continuously formed repeatedly. Are arranged.

At this time, assuming that both sides of the inclined surfaces 62-1, 62-2, 62-3 of the projections 60-1, 60-2, 60-3 are Y-axis, the arrow direction, which is the moving direction of the molten resin, is determined. The projections 60-1, 60-2, and 60-3 are arranged to form angles θ or more at right angles with respect to the X axis, and the mixing head 60 of which the molten resin proceeds as in the first embodiment. On one side, the protrusion 60-1 having the largest area is arranged, and the protrusions 60-2 and 60-3, which are gradually smaller in area toward the other side, are arranged in a fractal form.
Example 3

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Embodiments 1 and 2 described above have a structure in which rhombus and rectangular protrusions 52-1, 52-2, 52-3 and 60-1, 60-2, 60-3 are arranged in a fractal form, respectively. In the third embodiment, as shown in FIG. 4, the protrusions 70-1 having the largest area on the surface of the mixing head 70 are disposed at imaginary rectangular corners, respectively, between the protrusions 70-1. The projections 70-2 and 70-3 having different areas are arranged in a fractal form with a predetermined pattern in which they are arranged in combination with each other.

At this time, assuming that the inclined surfaces (72-1, 72-2, 72-3) of both sides of the projection (70-1, 70-2, 70-3) is the Y-axis, the direction of the arrow, which is the moving direction of the molten resin The projections 70-1, 70-2, 70-3 are arranged to form angles θ or more at right angles with respect to the X-axis, and, as with the first embodiment, of the mixing head 70 in which the molten resin proceeds. On one side, the protrusion 70-1 having the largest area is disposed, and the protrusions 70-2 and 70-3, which are gradually smaller in area toward the other side, are arranged in a fractal structure.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

As described above, the present invention provides a structure of a fractal form having a predetermined shape in the mixing head and a plurality of protrusions having different areas are arranged or combined to form a predetermined pattern, the pattern is repeated regularly, Assuming that the inclined surfaces on both sides of the protrusion are the Y-axis, the structure is arranged to form an angle at right angles or more with respect to the X-axis, thereby preventing the increase in pressure caused by the flow of the molten resin and the resulting product defects, By diversifying the flow path, the stirring function of evenly mixing the molten resin and the function of finally splitting the molten resin can be expected to be effectively exerted.

Claims (3)

In the mixing head of the screw-type injection molding apparatus, which is rotatably provided inside the case in a state of interlocking with the screw to transfer and mix the molten resin introduced through the hopper provided on one side of the case, Screw-type injection molding, characterized in that the surface of the mixing head has a predetermined shape and a plurality of protrusions forming different areas from the one side to the other side is reduced in size from the one side to the other in the form of a fractal form to form a continuous pattern repeatedly The mixing head of the device. The method of claim 1, Mixing head of the screw injection molding apparatus, characterized in that the protrusion is made of any one of a shape of a rhombus or a rectangle. The method of claim 2, Mixing head of the screw injection molding apparatus, characterized in that each of the inclined surfaces of the Y axis has a right angle or more to each other based on the X axis of the molten resin.

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