KR102197513B1 - Carbonization reducing method and mixing apparatus of plastic resin extruder - Google Patents

Abstract

The present invention relates to a carbonization reducing method for a plastic resin extruder and a mixing apparatus used for the same. According to the present invention, a capsule (10) containing nitrogen gas (G) and molten plastic resin (20) are mixed in a mixing apparatus (100), and the mixture is supplied to an extruder passage (210) of an extruder (200), such that the atmosphere of the extruder passage (210) is changed into an inert atmosphere, thereby blocking oxidation of the molten plastic resin (20) to maximally suppress the occurrence of the resin carbonized in the extruder passage (210).

Description

A mixing device used in the carbonization reduction method and carbonization reduction method of the plastic resin extruder {CARBONIZATION REDUCING METHOD AND MIXING APPARATUS OF PLASTIC RESIN EXTRUDER}

The present invention relates to a method for reducing carbonization of a plastic resin extruder and a mixing device used in a method for reducing carbonization, which can prevent the generation of carbonized resin inside an extruder used when manufacturing a plastic fuel tank.

In general, a vehicle equipped with an engine is equipped with a fuel tank capable of storing fuel, and the fuel tank is usually made of steel and plastic, and recently, weight reduction and fuel efficiency improvement have been achieved. The use of plastic fuel tanks is increasing.

Plastic fuel tanks are largely manufactured through a melting process, an extrusion process, and a blow process.The melting process is a process in which a plastic material is heated to a high temperature to melt it into a molten resin, and in the extrusion process, the molten resin is C-type and twin sheet ( Twin sheet), a process of extrusion molding into a parison such as a cylindrical shape.In the blow process, the parison is molded into the shape of a fuel tank by putting the parison into a mold and blowing high pressure air into the parison. It is a process to do.

The material used as a material for plastic fuel tanks is HDPE (High Density Polyethylene) or LDPE (Low Density Polyethylene), and the plastic material is melted by high temperature heat in the melting process to become a plastic molten resin, and the plastic molten resin is used in the extrusion process. It is supplied to the extruder, and the plastic melt is extruded into a parison of a specific shape (C type, twin sheet, cylindrical) by extrusion of the extruder.

On the other hand, when the high-temperature plastic molten resin comes into contact with oxygen in the air, carbonization occurs that turns into carbon lumps due to oxidation reactions, and carbonization occurs inside the extruder due to carbonization and accumulates, and carbonization occurs in the extruder. There is a disadvantage that the quality of the extruded parison deteriorates due to the resin.

The matters described as the background art are only for enhancing an understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

Korean Patent Publication No. 10-2009-0060809

The present invention is a mixing device used in the carbonization reduction method and carbonization reduction method of a plastic resin extruder capable of suppressing the occurrence of carbonization resin inside the extruder used when manufacturing a plastic fuel tank as much as possible. Its purpose is to improve the quality of the parison produced through it.

The method for reducing carbonization of a plastic resin extruder according to the present invention for achieving the above object comprises the steps of: preparing a capsule containing an inert gas; Supplying the capsule containing the inert gas and the plastic melt to a mixing device; Feeding the inert gas contained in the capsule and the plastic molten resin into an extruder while being mixed in a mixing device; And converting an internal atmosphere of the extruder from an active atmosphere to an inert atmosphere by an inert gas supplied into the extruder together with the plastic molten resin; As the internal atmosphere of the extruder is changed to an inert atmosphere, the occurrence of carbonized resin in the extruder is suppressed.

The inert gas is characterized in that either nitrogen gas or argon gas.

The film of the capsule is characterized in that the same material as the plastic melt.

As the capsule is exploded by the mixing device, the inert gas contained in the capsule and the plastic molten resin are mixed in the mixing device.

In addition, the mixing apparatus used in the carbonization reduction method of the plastic resin extruder according to the present invention includes: a hopper to which the capsule containing the inert gas and the plastic molten resin are supplied together; It is rotatably installed in the transfer pipe connecting the hopper and the extruder, and when rotating, the capsule is popped to mix the inert gas contained in the capsule and the plastic molten resin, and the mixture of the inert gas and the plastic molten resin is transferred to the extruder through the transfer pipe. A lead screw to supply; And a motor connected to the lead screw to rotate the lead screw.

It characterized in that it comprises a; a heater that is installed to be disposed along the longitudinal direction of the transfer pipe to generate heat to prevent curing of the plastic molten resin in the transfer pipe.

In an embodiment according to the present invention, a capsule containing nitrogen gas and a plastic molten resin are mixed in a mixing device and then supplied to the extruder passage of an extruder, through which the atmosphere of the extruder passage is changed to an inert atmosphere, so that the high-temperature plastic molten resin is By blocking contact with oxygen and blocking the oxidation reaction of the plastic melt, the occurrence of carbonized resin in the passage of the extruder can be suppressed as much as possible. As a result, the quality of the parison extruded through the extruder is improved. There is an effect that can be done.

1 is a schematic block diagram for explaining a carbonization reduction method of a plastic resin extruder according to the present invention,
2 is a view for explaining a process of manufacturing a capsule containing an inert gas according to the present invention,
3 is a view for explaining a mixing device used in the carbonization reduction method of the plastic resin extruder according to the present invention,
4 is an enlarged cross-sectional view of a moving pipe in which a hopper and a lead screw are installed in FIG. 3;
5 is an enlarged cross-sectional view for showing the inside of the extruder in FIG. 3.

Specific structural or functional descriptions of the embodiments of the present invention disclosed in this specification or application are exemplified only for the purpose of describing the embodiments according to the present invention, and the embodiments according to the present invention are implemented in various forms. It may be, and should not be construed as limited to the embodiments described in this specification or application.

Since the embodiments according to the present invention can be modified in various ways and have various forms, specific embodiments are illustrated in the drawings and will be described in detail in the present specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific form of disclosure, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of the rights according to the concept of the present invention, the first component may be named as the second component, and similarly The second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Other expressions describing the relationship between components, such as "between" and "just between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the existence of a specified feature, number, step, action, component, part, or combination thereof, but one or more other features or numbers It is to be understood that the presence or additional possibilities of, steps, actions, components, parts, or combinations thereof are not excluded in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present specification. .

Hereinafter, a method for reducing carbonization of a plastic resin extruder according to a preferred embodiment of the present invention and a mixing device used in the method for reducing carbonization will be described with reference to the accompanying drawings.

A method for reducing carbonization of a plastic resin extruder according to the present invention includes the steps of manufacturing a capsule containing an inert gas (S1); Supplying the capsule containing the inert gas and the plastic molten resin to a mixing device (S2); Mixing the inert gas contained in the capsule and the plastic molten resin in a mixing device (S3); A step (S4) of supplying the inert gas and the plastic molten resin to the extruder by operating the mixing device while being mixed in the mixing device; And the internal atmosphere of the extruder is changed from the active atmosphere to the inert atmosphere by the inert gas supplied into the extruder together with the plastic melt resin, and the phenomenon that the carbonized resin is generated inside the extruder as the internal atmosphere of the extruder changes to the inert atmosphere. It includes a suppressed step (S5).

That is, the material used as the material of the plastic fuel tank is HDPE (High Density Polyethylene) or LDPE (Low Density Polyethylene), and the plastic material is melted by high temperature heat in the melting process to become a plastic molten resin, and the plastic molten resin is an extrusion process. It is supplied to the extruder used in, and the plastic melt is extruded into a parison of a specific shape (C type, twin sheet, cylindrical) by extrusion of the extruder.

Then, the parison extruded through the extruder is put into a mold used in the blow process and high-pressure air is blown into the parison to shape the parison into the shape of a fuel tank.

On the other hand, when the hot plastic molten resin comes into contact with oxygen in the air, a carbonization phenomenon that turns into carbon lumps by oxidation reaction occurs.The carbonized resin generated by the carbonization phenomenon is inside the extruder (plastic molten resin is parison It accumulates in the extruder passage), and the quality of the extruded parison deteriorates due to the carbonized resin accumulated in the extruder passage of the extruder.

Therefore, the embodiment according to the present invention prevents the hot plastic melt from contacting with oxygen by changing the atmosphere of the extruder, that is, the atmosphere of the extruder passage from an active atmosphere to an inert atmosphere, thereby preventing the oxidation reaction of the plastic melt. By blocking, the generation of carbonized resin is blocked as much as possible, and as a result, the quality of the extruded parison can be improved.

Since the inside of the extruder is exposed to the atmosphere, oxygen exists in the extruder passage, and the atmosphere in the extruder passage exists as an active atmosphere.

In order to change the active atmosphere of the extruder passage into an inert atmosphere, the oxygen present in the extruder passage is removed, and instead of filling an inert gas (nitrogen, argon, etc.), the inert gas used in the examples according to the present invention is expensive. It is based on the use of cheap nitrogen.

In order to fill the extruder passage of the extruder with an inert gas (nitrogen), first, as shown in FIG. 2, the inert gas (nitrogen) contained in the cylinder 1 is transferred to the capsule maker 3 through the hose 2 and the inert gas A plurality of capsules 10 containing (G, nitrogen) are manufactured.

At this time, the film 11 forming the capsule 10 is preferably of the same material (HDPE or LDPE) as the plastic molten resin in order to prevent the physical properties of the plastic molten resin from changing when mixed with the plastic molten resin, but limited to this. It does not become.

After the manufacturing of the capsule 10 is completed, as shown in FIG. 2, a plurality of capsules 10 containing an inert gas (G, nitrogen) and a plastic melt 20 are supplied to the mixing device 100 together. , It is supplied through the hopper 110 constituting the mixing device 100.

The hopper 110 of the mixing device 100 is connected to the transfer pipe 120, and the transfer pipe 120 has a structure connected to the extruder 200.

The lead screw 130 is rotatably installed in the transfer pipe 120, and the lead screw 130 is configured to rotate by receiving the power of the motor 140.

The mixing jig 100 is a transfer that connects the hopper 110 to which a plurality of capsules 10 containing inert gas (G, nitrogen) and plastic melt 20 are supplied together, and the hopper 110 and the extruder 200 Pipe 120, a lead screw 130 rotatably installed in the transfer pipe 120, a motor 140 providing rotational power to the lead screw 130, and to be disposed along the longitudinal direction of the transfer pipe 120 As a configuration including the installed heater 150, the heater 150 serves to prevent curing of the plastic melt 20 existing in the transfer pipe 120 by generating heat.

When a plurality of capsules 10 containing an inert gas (G, nitrogen) and a plastic melt 20 are supplied to the mixing device 100 through the hopper 110, the transfer pipe 120 with the leadscrew 130 Moving to, and breaking the film 11 of the capsule 10 by the rotational friction of the lead screw 130, the inert gas (G, nitrogen) contained in the capsule 10 is mixed with the plastic molten resin 20.

The plastic molten resin 20 mixed with an inert gas (G, nitrogen) is moved by the rotation of the lead screw 130 and is supplied to the extruder passage 210 formed in the extruder 200 as shown in FIG. 5.

Normally, the extruder passage 210 is exposed to the atmosphere, so that oxygen exists in the extruder passage 210, whereby the atmosphere of the extruder passage 210 exists as an active atmosphere.

When the plastic molten resin 20 in which an inert gas (G, nitrogen) is mixed is supplied to the extruder passage 210, the inert gas (G, nitrogen) fills the extruder passage 210, whereby the extruder passage 210 The active atmosphere of is changed to an inert atmosphere.

In this way, when the atmosphere of the extruder passage 210 is changed to an inert atmosphere, the high-temperature plastic melt 20 is blocked from contacting oxygen, and thus the oxidation reaction of the plastic melt 20 is blocked. It is possible to suppress the occurrence of carbonized resin in 210 as much as possible, and as a result, it is possible to improve the quality of the extruded parison through the extruder 200.

On the other hand, nitrogen gas can be directly supplied from the cylinder containing nitrogen gas to the extruder passage of the extruder to change the atmosphere of the extruder passage to an inert atmosphere, but in general, the internal pressure of the extruder is much higher than the pressure of the cylinder containing nitrogen gas. It is large, and for this reason, there is a problem that it is practically impossible to directly supply nitrogen gas from the bomb to the extruder passage.

Therefore, the embodiment according to the present invention is to make a capsule 10 containing nitrogen gas (G), mix the capsule 10 and the plastic melt 20 in the mixing device 100, and then the extruder of the extruder 200 With the configuration of supplying to the passage 210, there is an advantage of being able to more smoothly supply nitrogen gas (G), which is an inert gas, to the extruder passage 210 through this.

As described above, in the embodiment according to the present invention, after mixing the capsule 10 containing nitrogen gas (G) and the plastic melt 20 in the mixing device 100, the extruder passage 210 of the extruder 200 By changing the atmosphere of the extruder passage 210 into an inert atmosphere, thereby blocking the high temperature plastic molten resin 20 from contacting oxygen, thereby blocking the oxidation reaction of the plastic molten resin 20 It is possible to suppress the occurrence of carbonized resin in the extruder passage 210 as much as possible, and as a result, there is an advantage of improving the quality of the extruded parison through the extruder 200.

Although the present invention has been illustrated and described with reference to specific embodiments, it is understood in the art that the present invention can be variously improved and changed within the scope of the technical spirit of the present invention provided by the following claims. It will be obvious to a person of ordinary knowledge.

1-cylinder 2-hose
3-Capsule Maker 10-Capsule
11-Film 20-Plastic melt
100-Mixing device 110-Hopper
120-Transfer pipe 130-Lead screw
140-motor 150-heater
200-extruder 210-extruder passage
G-inert gas (nitrogen)

Claims (6)

Manufacturing a capsule containing an inert gas;
Supplying the capsule containing the inert gas and the plastic melt to a mixing device;
Feeding the inert gas contained in the capsule and the plastic molten resin into an extruder while being mixed in a mixing device; And
And converting the internal atmosphere of the extruder from the active atmosphere to the inert atmosphere by the inert gas supplied into the extruder together with the plastic melt resin;
A method for reducing carbonization of a plastic resin extruder, characterized in that as the internal atmosphere of the extruder is changed to an inert atmosphere, the occurrence of carbonized resin in the extruder is suppressed. The method according to claim 1,
The method of reducing carbonization of a plastic resin extruder, wherein the inert gas is either nitrogen gas or argon gas. The method according to claim 1,
The method for reducing carbonization of a plastic resin extruder, characterized in that the film of the capsule is made of the same material as the plastic molten resin. The method according to claim 1,
A method for reducing carbonization of a plastic resin extruder, wherein the inert gas contained in the capsule and the plastic molten resin are mixed in a mixing device while the capsule is exploded by the mixing device. As a mixing device used in the carbonization reduction method of claim 1,
A hopper to which a capsule containing the inert gas and a plastic melt are supplied together;
It is rotatably installed in the transfer pipe connecting the hopper and the extruder, and when rotating, the capsule is popped to mix the inert gas contained in the capsule and the plastic molten resin, and the mixture of the inert gas and the plastic molten resin is transferred to the extruder through the transfer pipe. A lead screw to supply; And
A mixing device used in a method for reducing carbonization of a plastic resin extruder, comprising: a motor connected to the lead screw to rotate the lead screw. The method of claim 5,
A mixing device used in a method for reducing carbonization of a plastic resin extruder, comprising: a heater installed to be disposed along the longitudinal direction of the transfer pipe to generate heat to prevent curing of the plastic molten resin in the transfer pipe.

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