KR200324423Y1 - Mixing screw structure of extrusion molding machine for recycle is waste synthetic resin - Google Patents

Abstract

The present invention relates to a kneading screw structure of an extrusion molding machine for recycling waste resin, and more specifically, a heating cylinder in which an extrusion die 20 having a raw material input part 102 is formed at a front side and a discharge nozzle is formed at a rear side thereof. (10) A pair having a spiral tooth 304 formed at regular intervals on the outer circumferential surface along the central axis 302 of the same diameter therein is installed through the raw material input unit 102, the heating cylinder 10 A kneading screw (30, 30) of a known waste synthetic resin recycling extrusion molding machine for kneading while transporting the waste synthetic resin material melted therein to the extrusion die 20, the extrusion of the molten waste synthetic resin raw material through the extrusion die 20. For '),

Located in the lower portion of the raw material input portion 102 and positioned toward the extrusion die 20, the interval between the teeth (304) gradually becomes narrower, and the rear of the input transfer portion (30a) and the tooth 304 ), The interval between the primary kneading portion 30b and the tooth 304 is denser than that of the primary kneading portion 30b, and the groove 306 is formed at equal intervals around the tooth 304 at a high pressure. The high-pressure mixing section 30c and the low-pressure mixing section 30d are repeatedly arranged by the mixing section 30c and the low-pressure kneading section 30d having a larger spacing between the teeth 304 than the primary kneading section 30b and the constant mixing section 30d. And, all the teeth 304 are formed to be connected to each other with the same outer diameter, the waste synthetic resin raw material is injected into the extruder by forming the staying portion 30e is the tooth 304 is broken on both sides of the first high-pressure mixing section (30c) Not only can greatly improve the kneading performance of the high pressure mixing section, but also This arrangement enables high-density, high-speed extrusion of melted and kneaded raw materials, greatly improving the quality and productivity of recycled products.

Description

MIXING SCREW STRUCTURE OF EXTRUSION MOLDING MACHINE FOR RECYCLE IS WASTE SYNTHETIC RESIN}

The present invention relates to a kneading screw structure of an extrusion molding machine for recycling waste resin, and more specifically, an extrusion molding machine by efficiently improving the spiral gear structure formed on the outer peripheral surface of a pair of kneading screws installed inside a heating cylinder of the extrusion molding machine. It is to improve the kneading performance of the molten waste synthetic resin in the heating cylinder of the molten raw material at the same time and to greatly improve the extrusion density and extrusion speed of the molten raw material.

General waste synthetic resin recycling extrusion machine is a kind of plastic molding machine, and the waste synthetic resin material collected for recycling and processed into pellets is supplied to the inside of the heating cylinder, extruded through an extrusion die while being melted at high temperature and installed at the end of the heating cylinder. Depending on the cross-sectional shape of the extrusion die, it is a molding machine used to regenerate various types of synthetic resin products such as rods, plates, and shapes, and a kneading screw for kneading and extruding molten resin is usually installed inside a heating cylinder. Extruder is equipped with a kneading screw of the predominantly, but in recent years, in order to improve the extrusion density of the molten resin is a situation in which a pair of screws are interlocked with each other to install the situation.

However, the pair of kneading screws installed in such a conventional extrusion molding machine has a constant interval between the teeth formed on the outer peripheral surface of the central axis, or in order to improve the discharge density of the molten resin in the extrusion die in the direction toward the extrusion die By increasing the outer diameter of the gear, the extrusion pressure of the molten raw material was improved to exert an effect of increasing the discharge density, while the extrusion rate of the molten raw material was lowered, resulting in a drop in productivity.

The present invention has been made in order to solve the above conventional problems, the purpose of the present invention to improve the discharge density and discharge rate for discharging the molten resin in the extrusion molding machine at the same time.

In order to achieve the object of the present invention, the kneading screw of the present invention is formed such that the tooth gap gradually becomes narrower toward the extrusion die in the raw material input portion, the tooth gap is uniformly formed in the kneading portion, and the tooth gap in the high pressure mixing portion. By forming grooves along the outer periphery of the compact gear, the kneading portion and the high pressure mixing portion are repeated at regular intervals, thereby simultaneously improving the discharge density and discharge rate of the molten resin without changing the diameter of the kneading screw. When described in more detail by the accompanying drawings as follows.

1 is a plan view of the present invention

Figure 2 (a) is an enlarged cross-sectional view of the tooth feed portion of the present invention

(B) is an enlarged cross-sectional view of the first kneading portion of the present invention

(C) is an enlarged cross-sectional view of the high-pressure mixing unit of the present invention

(D) is an enlarged cross-sectional view of the low pressure kneading portion of the present invention

Figure 3 is a partial cross-sectional view of a molding machine showing a state of use of the subject innovation

Figure 4 is a longitudinal cross-sectional view showing a state of use of the subject innovation

Figure 5 is an exemplary view showing a side extrusion molding machine for recycling general waste resin.

<Description of Symbols for Main Parts of Drawings>

10: heating cylinder 102: raw material input portion

104 gas outlet 20 extrusion die

30, 30 ': Kneading screw 30a: Feeding and conveying part

30b: primary kneading unit 30c: high pressure mixing unit

30d: low pressure kneading part 30e: staying part

302: central axis 304: gear

306: groove

A raw material input part 102 is formed at the front side, and is formed at regular intervals on the outer circumferential surface along the central axis 302 of the same diameter inside the heating cylinder 10 in which the extrusion die 20 having the discharge nozzle is formed at the rear. A pair having a spiral tooth 304 is installed and kneaded while conveying the waste synthetic resin raw material which is introduced through the raw material input unit 102 and melted in the heating cylinder 10 toward the extrusion die 20, and the extrusion die In the kneading screw (30, 30 ') of the known waste synthetic resin recycling extrusion molding machine for extruding the molten waste synthetic resin raw material through the (20),

Located in the lower portion of the raw material input section 102 and the feed port (30a) and the gap between the teeth 304 gradually narrowed toward the extrusion die 20,

A first kneading portion 30b positioned at the rear of the feeding portion 30a and having a constant interval between the teeth 304;

The space between the teeth 304 is denser than the primary kneading portion 30b, and the high pressure mixing portion 30c having the groove portions 306 formed at equal intervals around the teeth 304,

Although the interval between the teeth 304 is wider than the primary kneading portion 30b and constitutes a constant low pressure kneading portion 30d,

The high pressure mixing unit 30c and the low pressure kneading unit 30d are repeatedly arranged, and all the teeth 304 are formed to be connected to each other with the same outer diameter, but the teeth 304 stay on both sides of the first high pressure mixing unit 30c. It is the structure which formed the base 30e.

Reference numeral '104' indicates a gas discharge part through which gas generated in the process of extruding the molten resin is discharged.

The present invention as described above can not only transfer the waste synthetic resin material which is injected and melted through the raw material input portion 102 of the heating cylinder 10 to the extrusion die 20 more quickly, but also improves the kneading performance in view. High density, high speed extrusion is possible.

That is, as shown in FIG. 1, a pair of kneading screws 30 are formed in which the teeth 304 are engaged with each other in the heating cylinder 10 by forming the teeth 304 on the outer circumferential surface along the central axis 302. 30 ') is formed on the side of the raw material input unit 102 located on the right side of the drawing, an injection feed unit 30a is formed in which the distance between the teeth 304 gradually decreases toward the extrusion die 20. The input transfer part 30a having the structure of 304 has a state in which the waste synthetic resin material processed in a pellet form is first introduced through the raw material input part 102 and is not completely melted inside the heating cylinder 10, so that the particles Due to its size, the raw material having large particles can be transferred more quickly so that a smooth raw material can be supplied. Since the injected raw material is gradually melted in the process of being transferred, the tooth 304 of the feeding portion 30a is extruded 20. Go towards As the gap becomes narrower, the raw material is kneaded at higher pressure.

Thus, when the raw material is melted to some extent inside the heating cylinder 10, the kneading of the raw material melted in the primary kneading unit 30b at the rear of the feeding and feeding unit 30a and the interval between the teeth 304 is constant is made. The first kneading unit 30b is transported while the molten raw material is kneaded at a constant speed because the interval between the teeth 304 is constant.

On the other hand, in the rear of the primary kneading portion 30b, the spacing between the teeth 304 is denser than the primary kneading portion 30b, and the high-pressure mixing portion 30c in which the groove portion 306 is formed around the tooth 304 is formed. Is formed, the raw material kneaded in the primary kneading portion 30b not only kneading higher pressure, but also the groove portion 306 formed around the tooth 304 crushes the waste synthetic resin pellets which are not completely melted. By performing the action, the raw material holding the state of the large particles is split into the state of the smaller particles, thereby generating a high shear rate and a high shear stress in the molten resin, thereby exhibiting improved kneading performance.

In addition, the lower pressure kneading portion 30d having a tooth 304 formed at a constant interval and wider than the interval between the teeth 304 formed in the high pressure mixing portion 30c at the rear of the high pressure mixing portion 30c that performs the strong kneading as described above. ) Is formed, and the molten raw material that has undergone a strong kneading process in the high pressure mixing unit 30c is smoothly and quickly transferred for a predetermined period, and the high pressure mixing unit 30c and the back of the low pressure mixing unit 30d are again. By repeatedly forming another low pressure kneading unit 30d, the waste synthetic resin raw material introduced in pellet form through strong kneading and soft and rapid transfer repeating can be completely melted and can be quickly discharged even in a high density state.

On the other hand, on both sides of the first high-pressure mixing section (30c) located behind the primary kneading unit (30b) is formed a staying portion (30e), which is a raw material conveyed at a high speed from the primary kneading unit (30b) Not only serves to properly adjust the feed rate before entering the high pressure mixing unit 30c having the tooth 304 structure that is denser than the primary kneading unit 30b, but also in the high pressure mixing unit 30c. By appropriately adjusting the feed rate of the raw material to be transferred to the primary low pressure kneading unit 30d, it is possible to achieve continuous and smooth transfer of the raw material.

In addition, in the present invention, on the central axis 302 formed in the feed and transfer portion 30a and the primary kneading portion 30b and the high pressure mixing portion 30c and the low pressure kneading portion 30d of the kneading screws 30 and 30 '. The diameters of all the teeth 304 are formed to the same diameter, and the inner diameter of the heating cylinder 10 in which the kneading screws 30 and 30 'of the present invention are installed is the same as the diameter of the teeth 304 of the blend screws from the raw material supply part. The extrusion die 20 is formed to the same outer diameter.

As described above, the present invention not only can greatly improve the kneading performance of the waste synthetic resin raw material that is injected into the extruder by improving the structure of the kneading screw, but also repeats the arrangement of the high pressure mixing part and the discharge part having different tooth spacing. Through the high-density, high-speed extrusion of the raw material to be melted and kneaded, it is possible to greatly improve the quality and productivity of the recycled product.

Claims (1)

A raw material input part 102 is formed at the front side, and is formed at regular intervals on the outer circumferential surface along the central axis 302 of the same diameter inside the heating cylinder 10 in which the extrusion die 20 having the discharge nozzle is formed at the rear. A pair having a spiral tooth 304 is installed and kneaded while conveying the waste synthetic resin raw material which is introduced through the raw material input unit 102 and melted in the heating cylinder 10 toward the extrusion die 20, and the extrusion die In the kneading screw (30, 30 ') of the known waste synthetic resin recycling extrusion molding machine for extruding the molten waste synthetic resin raw material through the (20), Located in the lower portion of the raw material input section 102 and the feed port (30a) and the gap between the teeth 304 gradually narrowed toward the extrusion die 20, A first kneading portion 30b positioned at the rear of the feeding portion 30a and having a constant interval between the teeth 304; The space between the teeth 304 is denser than the primary kneading portion 30b, and the high pressure mixing portion 30c having the groove portions 306 formed at equal intervals around the teeth 304, The high-pressure mixing section 30c and the low-pressure mixing section 30d are repeatedly arranged and composed of a constant low-pressure kneading section 30d having a larger spacing between the teeth 304 than the first kneading section 30b, and all the teeth 304. Are formed to be connected to each other with the same outer diameter, the kneading screw structure of the waste plastic resin recycling extrusion molding machine, characterized in that the teeth 30 on both sides of the first high-pressure mixing section (30c) formed a staying portion (30e) is broken