KR101740343B1 - Screen changer for filtering foreign of substancesynthetic resins - Google Patents

Abstract

The present invention relates to a screen changer for filtering resin foreign substances of an extruder capable of easily replacing an old screen which filters foreign substances included in a melted synthetic resin in an extruding process by being installed on an extruder for an extrusion regeneration process of the synthetic resin. When replacing a screen in a screen changer installed on the end of a two-step extruder, the screen can be replaced while a filtering process of a synthetic resin in a two-step extrusion process is not interrupted so continuity of the extrusion process of the synthetic resin can be secured. Also, after separating a screen to be replaced, a work for installing a novel screen is easily performed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen changer for filtering foreign matters in an extruder,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen changer for filtering foreign matters in an extruder, and more particularly, to a screen changer for filtering foreign matters in an extruder, which is installed in an extruder for a synthetic resin extrusion / To a screen changer for filtering foreign substances in an extruder.

Generally, a manufacturing method is known in which a waste synthetic resin is melted and then passed through at least one extruder to extrude and recycle the synthetic resin product into a predetermined synthetic resin product.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a process diagram showing an extrusion process facility for extrusion-regenerating a synthetic resin.

First, a synthetic resin material (a waste synthetic resin material or the like) is pulverized in a pulverizer 1, and then a plurality of washing machines 2-1, 2-2, 2-3 are sequentially passed through to remove various foreign substances contained in the synthetic resin material And the water contained in the washed synthetic resin material is removed from the dehydrator 3.

Next, the dewatered synthetic resin material is put into the hopper portion of the first extruder 4 and melted using the heating means while being conveyed along the screw.

Subsequently, the resin melted in the single-stage extruder 4 is passed through a double-stage extruder 5 to be extruded once again, and is passed through a screen in the screen changer 10 mounted at the end of the double-stage extruder 5 The foreign matters contained in the molten resin are filtered again.

At this time, foreign matter in the melted resin is finally filtered on the screen in the screen changer 10, so that it can be regenerated with a good quality synthetic resin material.

As a subsequent step, a step of cooling the resin extruded in the cooling water tank 6, a step of cutting the resin cooled in the cutting machine 7 to a predetermined length, a step of storing the cut resin in the raw material container 8 And the resin material contained in the raw material container 8 is used as a material for molding a predetermined product in the future.

Hereinafter, the conventional structure of the screen changer installed at the distal end of the two-stage extruder in the above-described synthetic resin re-extrusion process will be described with reference to FIG.

The conventional screen changer 10 is configured to include a pair of circular bodies 12 mounted in a resin filtering housing 11 and a hydraulic cylinder 13 for driving the circular body 12 forward and backward.

In addition, the circular body 12 is provided with a screen 14 through which the synthetic resin secondary-extruded along the circumferential direction passes.

Therefore, the synthetic resin extruded by the two-stage extruder 5 passes through the screen 14 mounted on the circular body 12 of the screen changer 10, and the foreign substances contained in the molten resin are introduced into the screen 14 Lt; / RTI >

More specifically, the synthetic resin extruded from the two-stage extruder flows along the inside of the hollow circular body 12 and then passes through a single screen 14 (FIG. 1) attached cylindrically over the entire circumferential surface of the circular body 12 So that the foreign substances contained in the molten resin are filtered on the inner surface of the screen 14. As a result,

At this time, if the amount of foreign matter to be filtered on the screen 14 is increased by a predetermined level, the synthetic resin will not pass through the screen properly, so the screen 14 must be replaced.

As shown in FIG. 2, the screen replacement operation is a step of driving the hydraulic cylinder 13 forward to push the circular body 12 in the advancing direction, thereby pulling the circular body 12 out of the resin filtering housing 11 Separating the existing screen 14 attached along the circumferential surface of the circular body 12 and then attaching the new screen 14 again and driving the hydraulic cylinder 13 back to the new screen 14, And inserting the attached circular body 12 into the resin filtering housing 11 in its original position.

However, the above-described conventional screen replacement operation has the following disadvantages.

First, the number of processes for replacing the screen such as the process of driving the hydraulic cylinder forward, the process of replacing the screen, and the process of driving the hydraulic cylinder backward are numerous, and the screen replacement workability is significantly lowered. It takes a long time.

Second, during the operation of replacing the screen, the operation of filtering the second extruded synthetic resin with the screen is completely stopped, and the productivity is lowered due to the discontinuity of the process, such as the interruption of the extrusion and regeneration process of the entire synthetic resin.

Korea Patent Registration No. 10-1661422 (2016.09.23)

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method for replacing a screen in a screen changer installed at a distal end of a two- The present invention provides a screen changer for filtering foreign matters of an extruder which can ensure continuity of a synthetic resin extrusion process and can easily carry out a work of mounting a new screen after separating a screen to be replaced, .

According to an aspect of the present invention, there is provided a skeleton for filtering foreign matter of a synthetic resin material that has been extruded and conveyed, comprising: an inlet port through which a resin extruded and conveyed by a screw is passed over a rear surface and an inner central space; A resin filtering housing in which a discharge port through which the filtered resin is discharged is formed; A main screen for filtering the synthetic resin introduced into the inlet is attached to the inner surface of the housing and a preliminary screen is attached to the outer surface of the housing, ; And a screen cylinder drive means connected to the rotation axis of the screen cylinder for rotating the screen cylinder by 180 ° when the main screen is replaced with a spare screen; The present invention provides a screen changer for filtering foreign matters in an extruder.

Preferably, the housing for resin filtration is formed on both sides with a replacement work hole through which the main screen or the preliminary screen is exposed to be replaceable or attachable.

The screen cylinder driving means includes a connecting plate mounted on the front surface of the screen cylinder, a motor mounted on the upper surface of the resin filtering housing, a driving gear connected to the rotating shaft of the motor, And a transmission gear which is coaxially connected to the connection plate.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

First, when the screen in the screen changer is replaced, the screen can be replaced without interrupting the synthetic resin filtration process of the two-stage extrusion process, thereby ensuring the continuity of the synthetic resin extrusion process, The reproduction productivity can be improved.

Second, since only the screen to be replaced is exposed to the outside, it is very easy to remove the existing screen after exposure and install a new screen, thereby shortening the screen replacement time and greatly improving the screen replacement workability .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a process drawing showing an extrusion process facility for extrusion-regenerating a synthetic resin,
2 is a schematic perspective view showing a conventional screen changer configuration and screen replacement process,
FIG. 3 is an exploded perspective view showing a screen changer for filtering foreign matters in the extruder according to the present invention, FIG.
4 is a cross-sectional view of a screen changer for filtering resin foreign substances in an extruder according to the present invention,
FIG. 5 is a perspective view illustrating a screen changing process of a screen changer for filtering foreign matters in the extruder according to the present invention. FIG.
6A to 6D are cross-sectional views showing a screen changing process of a screen changer for filtering resin foreign substances in an extruder according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As described above with reference to FIGS. 1 and 2, the resin melted in the single-stage extruder 4 is extruded once again through the two-stage extruder 5 in the process for extruding and regenerating the synthetic resin When the amount of the foreign matter filtered on the screen is higher than a predetermined level, the synthetic resin passes through the screen in the screen changer mounted on the distal end of the two-stage extruder (5) You will need to replace the screen as it will not pass properly.

Meanwhile, although the present invention has been described with respect to the two-stage extruder 5, the extruder constituting the feature of the present invention is not limited to the two-stage extruder 5, and a general extruder may be used.

The present invention can ensure the continuity of the synthetic resin extrusion process by replacing the synthetic resin filtration process of the two-stage extrusion process without interruption when the screen in the screen changer is replaced, There is a point to make it easy to install a new screen after disconnecting.

3 and 4 are an exploded perspective view and a cross-sectional view illustrating a screen changer for filtering resin foreign substances in an extruder according to the present invention, and FIG. 5 is a view illustrating a screen replacement process of a screen changer for filtering foreign matters in the extruder according to the present invention. It is a perspective.

3 to 4, reference numeral 100 designates a housing for resin filtration.

The resin filtering housing 100 is a skeletal body for filtering foreign matter of a synthetic resin material that is extruded and conveyed by a screw 102 included in a two-stage extruder, and is extruded and conveyed by a screw 102 An inlet 104 into which the resin flows is formed.

In addition, a discharge port 106 is formed in the bottom of the resin-filtering housing 100 so that the resin in the state that the foreign substance is filtered by the screen is discharged to the next process.

Particularly, a hollow screen cylinder 200 for filtering the foreign substances contained in the synthetic resin material is rotatably installed in both sides of the resin filtering housing 100, that is, at both sides of the inlet 104.

More specifically, the screen cylinder 200 has a structure in which a main screen 210 for filtering the synthetic resin introduced into the inlet 104 is attached to the inner side, and a preliminary screen 220 is attached to the outer side And is rotatably installed inside both sides of the resin filtering housing 100.

Here, the main screen 210 refers to a screen currently used for filtering out foreign substances from the synthetic resin. The spare screen 220 is a screen for replacing the main screen 210 when the life of the main screen 210 is over, it means.

Therefore, the synthetic resin material to be extruded and conveyed by the rotation of the screw 102 in the two-stage extruder is introduced into the inlet 104 of the screen cylinder 200 and then supplied to the main screen 210, so that the foreign matter is filtered, and the synthetic resin material, which is separated by the foreign matter, is discharged to the next process through the discharge port 106.

At this time, if the amount of the foreign matter filtered on the main screen 210 is higher than the predetermined level, the synthetic resin can not pass through the main screen 210. Therefore, the main screen 210 can be moved to the same preliminary screen 220 Replace it.

The screen cylinder 200 is rotated to position the main screen 210 to the preliminary screen 220 and the preliminary screen 220 to the main screen 210, It can be replaced with a new spare screen 220.

When the main screen 210 is connected to the rotation axis of the screen cylinder 200 and the main screen 210 is replaced with the auxiliary screen 220, 200 are rotated by 180 °.

More specifically, the screen cylinder driving means 300 includes a connecting plate 310 integrally mounted on the front surface of the screen cylinder 200, a motor 320 mounted on the upper surface of the resin filtering housing 100, A driving gear 330 coupled to the rotation shaft of the motor 320 and a transmission gear 340 coupled to the coupling plate 310 and coaxially engaged with the driving gear 330.

When the motor 320 of the screen cylinder driving means 300 is driven to rotate, the driving gear 330 connected to the rotation shaft of the motor 320 rotates and the transmission gear 340 engaged with the driving gear 330 is rotated The rotational force is transmitted to the connecting plate 310 so that the screen cylinder 200 integrated with the connecting plate 310 rotates by 180 °.

As the screen cylinder 200 rotates 180 degrees, the main screen 210 is positioned at the preliminary screen 220 and the preliminary screen 220 is positioned at the main screen 210 position.

At this time, on both sides of the resin filtering housing 100, a replacement operation tool 108 through which the main screen 210 or the preliminary screen 220 is exposed to be replaceable or attachable is formed.

The preliminary screen 220 is exposed through the replacement work 108 and the preliminary screen 220 rotates 180 ° with respect to the screen cylinder 200, The main screen 210 is moved to the position of the preliminary screen 220 as shown in FIG. 5, and is exposed to the outside through the replacement work opening 108.

Accordingly, the operator removes the main screen 210, which has been exposed through the main screen 210, that is, the replacement work tool 108, whose lifetime has expired, and then removes the new screen 220 Can be easily carried out.

At this time, since the preliminary screen 220 is moved to the position of the main screen 210, the process of filtering foreign matters contained in the synthetic resin material is not interrupted during the replacement operation for removing the main screen 210, ). ≪ / RTI >

Hereinafter, the process of replacing the screen of the screen changer will be described in more detail with reference to FIGS. 6A to 6D.

6A, the synthetic resin material flowing into the inlet 104 of the resin filtering housing 100 passes through the main screen 210, and foreign matter is filtered.

As shown in FIG. 6B, when the foreign substance is accumulated on the main screen 210 due to repeated use of the main screen 210, a performance deterioration that the synthetic resin material can not pass through may occur, and the main screen 210 may be replaced with a new, 220) in order to ensure the safety of the user.

As shown in FIG. 6C, as the screen cylinder 200 is rotated 180 ° by driving the screen cylinder driving means 300, the spare screen 220 is moved to the position of the main screen 210, The main screen 210 is moved to the position of the preliminary screen 220 and is exposed to the outside through the replacement work opening 108.

As shown in FIG. 6D, the operator removes the main screen 210 that has reached the end of its useful life, that is, the main screen 210 exposed through the replacement work tool 108, and then removes the new spare screen 220 It is possible to easily carry out the replacement work for attaching.

Thus, when replacing a screen (e.g., a main screen that has reached the end of its useful life) with a new screen (a preliminary screen) in this screen changer, the screen is replaced without interruption of the synthetic filtration process of the two- It is possible to ensure the continuity of the process of extruding the synthetic resin, thereby improving the extrusion and regeneration productivity of the synthetic resin.

In addition, since only the screen to be replaced (for example, the main screen having reached the end of its service life) is exposed to the outside, it is very easy to remove the exposed screen and mount the new spare screen again. And the workability of replacing the screen can be greatly improved.

On the other hand, the anti-fouling layer coated with the anti-fouling coating composition may be formed on the replacement work 108 to effectively prevent and remove the adhesion of the contaminants. The antifouling coating composition contains hydrogen peroxide and sodium metasilicate in a molar ratio of 1: 0.01 to 1: 2, and the total content of hydrogen peroxide and sodium metasilicate is 1 to 10 wt% with respect to the total aqueous solution. In addition, sodium metasilicate or calcium carbonate may be used as the material for improving the coating property of the anti-fouling coating layer, but sodium metasilicate is preferably used. The hydrogen peroxide and sodium metasilicate are preferably in a molar ratio of 1: 0.01 to 1: 2, and when the molar ratio is out of the above range, the coating property of the substrate is lowered or the moisture adsorption on the surface after coating is increased to remove the coating film have.

The hydrogen peroxide and sodium metasilicate are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the amount of the hydrogen peroxide and the sodium metasilicate is less than 1% by weight, Precipitation tends to occur.

As a method of applying the composition for anti-fouling coating on a substrate, it is preferable to apply the coating composition by a spray method. In addition, the final coated film thickness on the replacement work 108 is preferably 500 to 2000 angstroms, and more preferably 1000 to 2000 angstroms. When the thickness of the coating film is less than 500 ANGSTROM, there is a problem that it deteriorates in the case of a high-temperature heat treatment. When the thickness is more than 2000 ANGSTROM, crystallization of a coated surface tends to occur.

Further, the composition for antifouling coating can be prepared by adding 0.1 mol of hydrogen peroxide and 0.05 mol of sodium metasilicate to 1000 mL of distilled water, followed by stirring.

A discoloring portion whose color changes according to the temperature can be applied to the periphery of the motor 320. The discoloring portion is coated on the surface of the motor 320 with two or more coloring materials that change color when the temperature is equal to or higher than a predetermined temperature, and is separated into two or more sections according to the temperature change, , And a protective film layer is applied on the discolored portion to prevent the discolored portion from being damaged.

Here, the discoloring portion may be formed by applying a temperature discoloring material having a discoloration temperature of not less than 40 DEG C and not less than 60 DEG C, respectively. The discoloring portion is for detecting a change in temperature of the paint by changing the color according to the temperature of the motor 320.

The discoloring unit may be formed by applying a temperature discoloring material whose color changes when the temperature is equal to or higher than a predetermined temperature, to the surface of the motor 320. In addition, the temperature discoloring substance is generally composed of a microcapsule structure having a size of 1 to 10 탆, and the microcapsules can exhibit a colored and transparent color due to the bonding and separation phenomenon depending on the temperature of the electron donor and the electron acceptor.

In addition, the temperature-changing materials can change color quickly and have various coloring temperatures such as 40 ° C, 60 ° C, 70 ° C, and 80 ° C, and such coloring temperature can be easily adjusted by various methods. Such a temperature-coloring material may be various kinds of temperature-coloring materials based on principles such as molecular rearrangement of an organic compound and spatial rearrangement of an atomic group.

For this purpose, it is preferable that the discoloring unit is formed so as to be divided into two or more sections according to the temperature change by applying two or more temperature-coloring materials having different discoloration temperatures. The temperature-coloring layer preferably uses a temperature-coloring material having a relatively low temperature of the discoloration temperature and a temperature-discoloring material having a relatively high discoloration temperature, more preferably a discoloration temperature of not lower than 40 ° C and not lower than 60 ° C A color change portion can be formed by using a temperature coloring material.

Accordingly, the change in the temperature of the motor 320 can be detected step by step, so that the temperature change of the paint can be detected. Accordingly, the motor 320 can be operated in an optimum state, The damage can be prevented in advance.

In addition, the protective film layer is coated on the discolored portion, thereby preventing the discolored portion from being damaged due to external impact, easily recognizing discoloration of the discolored portion, and considering the weakness of the temperature discolored material, Is preferably used.

In order to prevent corrosion of the surface of the housing 100 for resin filtration, a surface protective coating layer may be formed of a surface coating material of a metal material. The surface protective coating layer is composed of 2.5% by weight of zirconium powder, 60% by weight of alumina powder, 30% by weight of NH ₄ Cl, 2.5% by weight of zinc, 2.5% by weight of magnesium and 2.5% by weight of titanium.

The zirconium powder is excellent in corrosion resistance and heat resistance. These zirconium powders were mixed at 2.5 wt%. If the mixing ratio of the zirconium powder is less than 2.5% by weight, the corrosion resistance and the heat resistance are not greatly improved. On the other hand, when the mixing ratio of the zirconium powder exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, titanium is preferably mixed at 2.5% by weight.

The alumina powder is added for the purpose of sintering, entangling, fusion prevention, etc. when heated to a high temperature. When such an alumina powder is added in an amount of less than 60% by weight, the effect of sintering, entangling and fusion prevention is deteriorated. When the alumina powder exceeds 60% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 60 wt% of the alumina powder.

The NH ₄ Cl reacts with zinc and magnesium in a vapor state to activate diffusion and penetration. This NH ₄ Cl is added in an amount of 30% by weight. When NH ₄ Cl is added in an amount of less than 30% by weight, reaction with zinc or magnesium in a vapor state is not properly performed, and thus diffusion and penetration are not activated. On the other hand, if NH ₄ Cl exceeds 30 wt%, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 30 wt% of NH ₄ Cl.

The zinc is compounded to prevent corrosion of the metal that is in contact with water and to be used for electrical applications. 2.5% by weight of this zinc is mixed. If the mixing ratio of zinc exceeds 2.5% by weight, corrosion of the metal which is in contact with water can not be properly prevented. On the other hand, when the mixing ratio of zinc exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that zinc is mixed at 2.5% by weight.

Since the pure metal of magnesium has a low structural strength, it is used in combination with the zinc and the like to improve the hardness, tensile strength and corrosion resistance of the metal. This magnesium is mixed at 2.5% by weight. When the mixing ratio of magnesium is less than 2.5% by weight, the hardness, the tensile strength and the corrosion resistance to the salt water of the metal are not greatly improved when they are combined with zinc and the like. On the other hand, when the mixing ratio of magnesium exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that magnesium is mixed with 2.5% by weight.

The titanium is a lightweight, hard and corrosion resistant transition metal element with a silver-white metallic luster. Because it has excellent corrosion resistance and specific gravity, it weighs only 60% of steel. Therefore, the weight of the coating material applied to the metal base material is reduced, Excellent water resistance and corrosion resistance.

This titanium is mixed at 2.5% by weight. If the mixing ratio of titanium is less than 2.5% by weight, the weight of the coating material applied to the metal base material is not so reduced, and glossiness, water resistance and corrosion resistance are not greatly improved. On the other hand, when the mixing ratio of titanium exceeds 2.5% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, titanium is preferably mixed at 2.5% by weight.

The method of applying the surface of the housing 100 for resin filtration according to the present invention is as follows.

The resin-filtering housing 100 in which the surface protective coating layer is to be formed and the coating material blended in the above-described configuration are put in the closed furnace together. In order to prevent oxidation of the resin-filtering housing 100, argon gas is injected at a rate of 1 to 10 min, and maintained at a temperature of 700 to 800 DEG C for 4 to 5 hours while the argon gas is injected.

The zirconium powder, the alumina powder, the zinc powder, the magnesium powder, and the titanium powder are formed on the surface of the housing 100 for resin filtration by performing the above steps to form zirconium powder, alumina powder, zinc, magnesium, To form a surface protective coating layer.

After the surface protective coating layer is formed, the temperature inside the closed chamber is maintained at a temperature of 800 ° C. to 900 ° C. for 30 to 40 hours to form an anti-corrosive surface protective coating layer on the surface of the base material. Thereby isolating the outside air. At this time, a sudden temperature change in the above-described process may cause a temperature change at a rate of 60 ° C / hr because the surface protective coating layer on the surface of the resin filtering housing 100 may be peeled off.

The surface protective coating layer of the present invention has the following advantages.

Since the surface protective coating layer of the present invention has a very wide range of applications, it can be applied by various methods such as curtain coating, spray painting, dip coating, flooding and the like.

The surface protective coating layer of the present invention can be coated with a very thin layer thickness in addition to the principle protection against corrosion and / or scale, thereby improving electrical conductivity as well as material and cost reduction. A thin electrically conductive primer may be applied to the top of the application layer if high electrical conductivity is desired after the hot forming process.

After the molding process or the hot forming process, the coating material can be retained on the surface of the substrate, for example, to increase scratch resistance, to improve corrosion protection, to meet aesthetic appearance, to prevent discoloration, And may be provided as a primer for conventional downstream processes (e.g., impregnated and electro-mobile dip application).

Since the surface protective coating layer composed of zirconium powder, alumina powder, NH ₄ Cl, zinc, magnesium and titanium is applied to the resin filtration housing 100 of the present invention, it is possible to remove the dust or contaminants from the resin- Corrosion of the surface can be prevented.

100: Housing for resin filtration
102: Screw
104: inlet
106: Outlet
108: Replacement work area
200: Screen cylinder
210: Main screen
220: preliminary screen
300: Screen cylinder driving means
310: connection plate
320: motor
330: drive gear
340: transmission gear

Claims (3)

An inflow port (104) through which the resin extruded and conveyed by the screw (102) is introduced through the rear surface and the inner central space is formed, and the resin filtered by the foreign substance is discharged to the bottom surface of the skeleton body for filtration of the extruded synthetic resin material A resin filtration housing 100 having a discharge port 106 formed therein;
A main screen 210 for filtering the synthetic resin introduced into the inlet 104 is attached to the inner side and a preliminary screen 220 is attached to the outer side of the main screen 210, A cylinder (200) for a screen which is rotatably housed inside both sides;
A screen cylinder driving means 300 connected to the rotation axis of the screen cylinder 200 to rotate the screen cylinder 200 by 180 ° when the main screen 210 is replaced with a spare screen 220;
And a screen changer for filtering foreign matters in the extruder.
The method according to claim 1,
Wherein the resin filtering housing (100) is provided with a replacement operation hole (108) through which the main screen (210) or the preliminary screen (220) Screen Changer.
The method according to claim 1,
The screen cylinder driving means 300 includes:
A connection plate 310 mounted on the front surface of the screen cylinder 200;
A motor 320 mounted on an upper surface of the resin filtering housing 100;
A driving gear 330 connected to the rotating shaft of the motor 320;
A transmission gear 340 which is engaged with the driving gear 330 and coaxially connected to the connection plate 310;
And a screen changer for filtering resin foreign substances in the extruder.

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