KR101871228B1 - Pipe manufacturing method and pipe manufactured by the manufacturing method - Google Patents

Abstract

The present invention relates to a pipe manufacturing method and a pipe manufactured by the manufacturing method. The purpose of the present invention is to provide a pipe manufacturing method which is capable of increasing rigidity of the pipe by adding wooden powder and compressed waste paper to the pipe, and a pipe manufactured by the manufacturing method. The pipe manufacturing method according to a first embodiment of the present invention, as a method of manufacturing the pipe by coiling a wall pipe including an inner layer formed of a PE mixture and an outer layer formed of a PE rein, comprises the steps of: (a) mixing raw materials and additives in a mixing unit to produce a PE mixed material; (b) injecting the PE mixed material into an inlet portion of an extrusion unit to melt the PE mixed material by a heating wire; (c) transferring the PE mixed material melted by the heating wire to an outlet portion of the extrusion unit, and extruding the melted PE mixed material to produce the PE mixture; (d) injecting the extruded PE mixture into a vacuum unit including dies to mold the extruded PE mixture; (e) injecting the molded PE mixture into a cooling unit to cool the molded PE mixture; (f) recoating the cooled PE mixture with a PE resin having a certain heat applied thereto to manufacture the wall pipe; (g) coiling the wall pipe to manufacture the pipe; and (h) cutting the manufactured pipe, wherein the raw materials may include the wooden powder, compressed waste paper, and PE resin.

Description

[0001] PIPE MANUFACTURING METHOD AND PIPE MANUFACTURING METHOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pipe manufactured by a pipe manufacturing method and a manufacturing method thereof, and more particularly, to a pipe manufacturing method in which the rigidity is improved by adding wood and compression waste paper and a pipe manufactured by the manufacturing method.

Generally, a sewer pipe or a water pipe through which a fluid moves is used as a raw material only for a synthetic resin having few defects such as PVC, PE, and PP.

In particular, such PVC, PE, and PP are resistant to chemicals, have high resistance to corrosion or abrasion, and have soft surfaces that minimize friction and resistance when flowing, It is useful.

However, the pipe made of only the above-mentioned synthetic resin has a weak original stiffness compared to other types of pipes, and it is disadvantageous in that it is not suitable for use in a place where the ground is weak, in the vicinity of a tidal flat, or in a place with many mud such as rice.

Therefore, there is a need for a pipe made of a synthetic material that can increase rigidity, not only using a synthetic resin as a raw material.

It is an object of the present invention to provide a pipe manufacturing method capable of increasing rigidity by adding wood and compression waste paper and a pipe manufactured by the manufacturing method.

According to a first aspect of the present invention, there is provided a method of manufacturing a pipe by winding a wall pipe through which a PE mixture forms an inner layer and a PE resin forms an outer layer, Mixing the raw material and the additive in a mixing portion to produce a PE mixed material; (b) injecting the mixed PE mixed material into an inlet portion of the extruded portion and melting the mixture into hot wire; (c) transferring the PE mixed material melted by the hot wire to a lead portion of the extruding portion, and then extruding the PE mixed material to produce a PE mixture; (d) injecting the extruded PE mixture into a die having a die and molding the die mixture; (e) introducing the molded PE mixture into a cooling section to cool the PE mixture; (f) adding the cooled PE mixture to the PE resin to form a wall tube; (g) winding the wall tube to produce a pipe, and (h) cutting the pipe. The raw material may include wood powder, compression pulp, and PE resin.

Here, the wall pipe may form an inner layer and an outer layer at a ratio of 70 to 90 parts by weight of the PE mixture and 10 to 30 parts by weight of the PE resin, respectively.

Also, in the step (c), a double wall tube having an inner layer of 'ㅁ' type may be manufactured by providing a first die having a 'ㅁ' shape arranged in a row and a lateral direction, A multi-walled tube having a second die arranged transverse to the row 2 to form an inner layer in the form of a paddy may be produced.

The step (e) may include a step of removing dust by ultrasonic vibration.

The method may further include, after the step (e), a dust suppressing step of regulating humidity by spraying water onto the water injector.

Next, a pipe manufacturing method according to a second embodiment of the present invention is a method for manufacturing a pipe in which a PE mixture forms an inner layer and a PE resin forms an outer layer, comprising the steps of: (a) Mixing the additives to produce a PE mixed material; (b) injecting the mixed PE mixed material into an extruder and extruding it to form a cylindrical PE mixture; (c) coating the extruded PE mixture with a PE resin supplied from a resin supply unit in a mixing space of the coated portion to produce a pipe; (d) cooling the produced pipe in a cooling section, and (e) cutting the cooled pipe at a cutting section, wherein the raw material may include wood powder, compression pulp, and PE resin.

In addition, the pipe may form an inner layer and an outer layer at a ratio of 70 to 90 parts by weight of the PE mixture and 10 to 30 parts by weight of the PE resin, respectively.

In the method for manufacturing a pipe according to the first and second embodiments of the present invention, the step (a) may include 35 to 45 parts by weight of the wood powder, 15 to 25 parts by weight of the pulverized waste paper, 25 To 35 parts by weight, and the additive is added in an amount of 5 to 15 parts by weight.

In addition, the hot wire may melt the PE mixed material at a temperature of 190 ° C to 200 ° C.

In addition, the raw material may further include natural fiber, and the natural fiber may be one of rice hull, rice bran, mackerel, and reed.

The pipe manufactured according to the embodiment of the present invention is advantageous in that the pipe has a high rigidity because the PE mixture, which is the inner layer, is added with wood and compressed waste paper.

In addition, wood pulp and waste paper are recycled materials and have cost-saving and eco-friendly effects.

In addition, the pipe manufactured according to the embodiment of the present invention is advantageous in that the PE resin is formed on the outer layer to facilitate adhesion, and smooth flow of water.

1 (a) to 1 (c) are a perspective view and a cross-sectional view of a pipe manufactured by the pipe manufacturing apparatus and method according to the first embodiment of the present invention.
2 is a perspective view of a pipe manufacturing apparatus according to the first embodiment of the present invention.
Fig. 3 is a view showing that the structure of the dust suppressing unit and the detecting unit is added to the pipe manufacturing apparatus of Fig. 2; Fig.
4 is an internal configuration diagram of a mixing section which is a constitution of a pipe manufacturing apparatus according to an embodiment of the present invention.
5 is a cross-sectional view of a pipe manufactured by the pipe manufacturing apparatus and method according to the second embodiment of the present invention.
6 is a plan view of a pipe manufacturing apparatus according to a second embodiment of the present invention.
7 is a flowchart of a pipe manufacturing method according to the first embodiment of the present invention.
FIG. 8 is a flowchart showing a dust removing step added to the pipe manufacturing method of FIG.
9 is a flowchart of a pipe manufacturing method according to a second embodiment of the present invention.

Hereinafter, the description of the present invention with reference to the drawings is not limited to a specific embodiment, and various transformations can be applied and various embodiments can be made. It is to be understood that the following description covers all changes, equivalents, and alternatives falling within the spirit and scope of the present invention.

In the following description, the terms first, second, and the like are used to describe various components and are not limited to their own meaning, and are used only for the purpose of distinguishing one component from another component.

Like reference numerals used throughout the specification denote like elements.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the terms " comprising, "" comprising, "or" having ", and the like are intended to designate the presence of stated features, integers, And should not be construed to preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9 attached herewith.

1 (a) to 1 (c) are a perspective view and a cross-sectional view of a pipe manufactured by the pipe manufacturing apparatus and method according to the first embodiment of the present invention, and FIG. 2 is a cross- Fig. 3 is a view showing that the structure of the dust suppressing unit and the detecting unit is added to the pipe manufacturing apparatus of Fig. 2, and Fig. 4 is a perspective view of the mixing unit which is a constitution of the pipe manufacturing apparatus according to the embodiment of the present invention Fig.

Referring to FIG. 1, a pipe manufactured according to the first embodiment of the present invention is formed by forming an inner layer with a polyethylene (M) mixture and forming an outer layer with a polyethylene (PE) resin A wall tube (profile) may be wound and manufactured.

Here, the PE (polyethylene) mixture M may include wood powder, compression pulp, PE resin, and additives, and these materials may be mixed with each other in a predetermined ratio to prepare a PE mixture material for making the PE mixture (M) .

Hereinafter, an apparatus for manufacturing pipes according to a first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4. FIG.

2 to 4, a pipe manufacturing apparatus 1 according to a first embodiment of the present invention includes a mixing unit 10, an extruding unit 20, a vacuum 30, a cooling unit 40, A winding portion 50, a coating portion 60, and a cut portion 70, as shown in FIG.

Specifically, the mixing section 10 may include a hopper 12 and a mixing tube 14. [ Further, the mixing section 10 can mix the raw material and the additive, which are the material of the pipe. Here, the raw material may include wood powder, compressed pulp, PE resin, and the like. That is, the mixing section 10 may be formed to mix the wood powder, the compressed waste paper, the PE resin, and the additives injected through the hopper 12 in the compounding tube 14. However, the raw material is not limited to being illustrative and it is natural that the mixing portion 10 can mix various materials.

Hereinafter, it will be described based on raw materials provided with wood powder, compressed waste paper and PE resin for easy understanding.

The mixing section 10 may be provided with a twin screw 16 for mixing the raw material and the additive. This is because, in the case of a single screw, the wood powder is heavy and sinks, and in the case of the waste paper and the PE resin, the wood powder is not easily mixed. The composition is compressed and mixed through the twin screw 16, , The PE resin and the additive can be mixed more easily.

The extruding portion 20 can be formed by melting and extruding the PE mixed material in which the wood powder, waste paper, PE resin and additives are mixed in the mixing portion 10.

To this end, the extruding part 20 may form a cylindrical body, and a conveying screw 24 may be provided therein. Further, a plurality of hot wires 22 may be provided on the inner circumferential surface of the cylindrical body of the extruded portion 20. [ That is, the extruded portion 20 melts the charged PE mixed material with the hot wire 22, and the PE mixed material melted by the hot wire 22 at this time is discharged from one side by the rotation of the feed screw 24 provided therein And can be extruded from the other side.

Through which it is conveyed by the conveying screw 24 and can be made of a PE mix M of the desired form when the molten PE mixed material is extruded.

The vacuum chamber 30 may be provided to be aligned with the extrusion portion 20 so as to allow the PE mixture M extruded from the extrusion portion 20 to pass therethrough. The vacuum chamber 30 can be formed by passing the PE mixture M having a predetermined shape extruded from the extrusion portion 20 through the inlet portion. To this end, the vacuum 30 may form a die coupling portion 32 at the lead-in portion.

In this case, the first dies D1 arranged in one row and one row are combined with each other in the dice coupling part 32, or the 'd' shape in which the size is smaller than the 'k?' And a second die D2 formed so as to be arranged in two rows and two rows.

This is because the pipe wall pipe (profile) manufactured by the pipe manufacturing apparatus according to the first embodiment of the present invention is formed as a double-walled pipe or a multi-walled pipe, and depending on the shape of the die coupled to the die- The outer layer and the inner layer may be formed as a 'ㅁ' shape, the outer layer may be formed as a 'ㅁ' shape, and the inner layer may be formed as a multi-walled tube formed as a 'paddy' shape.

However, the present invention is not limited to this. For example, various types of wall pipes for increasing rigidity can be manufactured by connecting dies of various shapes to the dice coupling portion 32. [

The PE mixture M formed through the vacuum 30 may be transferred to the cooling unit 40.

The cooling section 40 may be arranged to be aligned with the vacuum 30. The cooling unit 40 may include a plurality of injection nozzles inside the cooling unit 40 to cool the molded PE mixture M, or may have a water tube formed along the longitudinal direction for containing the cooling water. That is, the molded PE mixture M can be cooled while being conveyed by a plurality of injection nozzles, or can be cooled by passing through a water bottle containing the cooling water.

The winding unit 50 may wind the PE mixture M, that is, the wall pipe (profile), which has been completed until the cooling process. At this time, the coating unit 60 may be provided on the upper end of the winding unit 50.

The coating portion 60 is for forming an outer layer of the pipe manufactured according to the first embodiment of the present invention and is formed by wrapping a PE resin R over the outer side of the PE mixture M wound from the winding portion 50 It can be applied. At this time, the coating portion 60 is formed to apply a predetermined heat to the PE resin (R) so that the PE resin (R) sticks to the outside of the PE mixture (M).

That is, the wall tube (profile) that is wound by the winding section 50 is wrapped and wound by the coating section 60 so that the PE resin R forms an outer layer before being wound, A waste paper, a PE mixture (M) to which a PE resin is added, and an outer layer can be made of a pipe (P) formed with a PE resin (R).

Here, the winding unit 50 may be formed to apply a predetermined heat to one side of the wall pipe (profile) so that the wall pipes (profiles) are not bonded to each other. The winding unit 50 is provided with a plurality of injection nozzles 52 for spraying cooling water on one side so that the heat of the pipe P in which the PE resin R is covered can be rapidly cooled.

The cut portions 70 may be arranged in a line on one side of the take- Through this, the pipe P can be cut and finished to a predetermined size.

The pipe manufacturing apparatus according to the first embodiment of the present invention may further include a vortex generator 200, a dust suppressor 210, an ultrasonic vibrator (not shown), and a detector 220.

Specifically, the vortex generator 200 may be included in the mixing unit 10. Further, a plurality of vortex generators 200 may be formed around the twin screw 16. This is to prevent raw materials such as wood powder, compressed pulverized paper, PE resin and the like from sinking or floating, and may be composed of a motor and a fan, and the raw material and additive are not diverted through the vortex generator 200 And can be guided to the twin screws 16 to facilitate mixing.

The ultrasonic vibrating part (not shown) and the dust restraining part 210 may be provided for dust suppression. This is because the PE resin (R) coated before the winding can be easily removed from the PE mixture (M) by dust or impurities when dust or impurities stick to the PE mixture, thereby reducing the life expectancy of the pipe .

In order to prevent this, the ultrasonic vibration unit (not shown) may be included in the cooling unit 40. When cooling the PE mixture M formed through the vacuum 30, the cooling is performed together with the ultrasonic vibration , The effect of cooling and dust removal can be seen.

 The dust restraining part 210 may be provided on the upper side between the cooling part 40 and the winding part 50. This is because the cooled PE mixture M moving between the cooling section 40 and the take-up section 50 is easily exposed to dust and impurities by being exposed to the outside.

Accordingly, the dust suppressing unit 210 may be provided with one or more water injecting apparatuses. The water injecting apparatus adjusts the humidity by spraying water around the PE mixture M exposed to the outside, so that the dust or impurities are mixed with the PE mixture (M) can be suppressed.

The detecting unit 220 may be formed at an end of the cutout 70. [ Here, the detecting unit 220 is for detecting whether or not the manufactured pipe P is defective and stiffness. The detecting unit 220 includes a detector for measuring the depth of the pipe P by contacting one side of the pipe P, A display indicating the degree of failure and stiffness, and the like.

Hereinafter, a pipe manufacturing apparatus 100 and a pipe manufactured by the manufacturing apparatus 100 according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 6. FIG.

FIG. 5 is a cross-sectional view of a pipe manufactured by the pipe manufacturing apparatus and method according to the second embodiment of the present invention, and FIG. 6 is a plan view of the pipe manufacturing apparatus according to the second embodiment of the present invention.

5, a pipe manufactured according to the second embodiment of the present invention may be formed into a cylindrical shape by forming an inner layer with a mixture of polyethylene (PE) and forming an outer layer with polyethylene (PE) resin .

Here, the PE (polyethylene) mixture may include wood powder, waste paper pulp, PE resin, additives, and the materials may be mixed with each other in a predetermined ratio to produce a PE mixture material for making the PE mixture (M).

Hereinafter, an apparatus 100 for manufacturing a pipe according to a second embodiment of the present invention will be described in detail with reference to FIG.

5 to 7, a pipe manufacturing apparatus according to a second embodiment of the present invention includes a mixing unit 10, an extrusion unit 120, a resin supply unit 130, a coating unit 140, a cooling unit 40 ), And a cut-out portion (70).

The mixing section 10, the cooling section 40 and the cut section 70 are the same as the mixing section 10, the cooling section 40 and the cut section 70 described in the pipe manufacturing apparatus according to the first embodiment of the present invention, . ≪ / RTI >

Accordingly, the following description will focus on the extrusion portion 120, the resin supply portion 130, and the coating portion 140 which are different from each other.

The extrusion portion 120 can extrude the mixed PE mixed material through the twin screw 16 in the mixing portion 10. To this end, the extrusion part 120 may have a die coupling part 132 at its end, and a circular die may be coupled to the die coupling part 132. This is because, unlike the pipe manufacturing apparatus according to the first embodiment, the inner wall of the pipe is formed by the extrusion portion 120, As shown in Fig.

However, the above-mentioned cylindrical pipe manufacturing is exemplary, and it is natural that other types of pipe inner layers can be manufactured by changing the shape of dice.

The extruded portion 120 of the second embodiment may include a plurality of hot wires 122 along a body formed in a cylindrical shape so as to melt the PE mixed material in the same manner as the extruded portion 20 of the first embodiment , And a conveying screw (not shown) may be provided therein to convey the melted PE mixed material in the longitudinal direction.

The molten PE mixed material transferred to the transfer screw (not shown) may be extruded into the molded PE mixture M through the end of the extrusion portion 120 having the die coupling portion 132 as described above.

The resin supply unit 130 may be provided at one side of the extrusion unit 120. Here, the resin supply unit 130 may include a hopper (not shown) at one side thereof to receive the PE resin R, and the drawn PE resin R may be screwed into the inside And the like) can be formed. In addition, the resin supply unit 130 may be formed to apply a predetermined heat to the supplied PE resin R by providing a heat line (not shown) around the body.

The coating portion 140 may be connected to the extrusion portion 120 and the resin supply portion 130. In order to coat the PE resin (R) delivered from the resin supply part (130) to the PE mixture (M) molded by the extrusion part (120), the coating part (140) And the PE resin (R) transferred from the resin supply unit 130 may be formed so that the PE resin (M) outer layer may be formed to overlap with the PE resin (R) have.

The PE mixture (M) and the PE resin (R) formed of the outer layer and the inner layer by the coating part 140 pass through the cooling part 40 arranged in line with the coating part 140, .

Also, the manufactured pipe may be cut to a predetermined length through a cut-out portion 70 provided to be aligned with the cooling portion 40 and finally completed.

Meanwhile, the pipe manufacturing apparatus 100 according to the second embodiment of the present invention may further include a vortex generator 200 and a detection unit 220.

This can be substantially the same as the vortex generator 200 and the inspection unit 220 of the pipe manufacturing apparatus according to the first embodiment. That is, the vortex generator 200 of the pipe manufacturing apparatus 100 according to the second embodiment may be included in the mixing unit 10, and a plurality of vortex generators 200 may be formed around the twin screw 16. This makes it easier to mix raw materials and additives.

The detection unit 220 can be formed at the end of the cutout 70, and can check whether the pipe is defective or stiff, which is composed of a detector, a display, and the like.

In addition, the pipe manufacturing apparatus 100 according to the second embodiment of the present invention may further include an auxiliary supply unit 170 connected to the coating unit 140 and having a hopper, (130).

Hereinafter, a pipe manufacturing method according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 7 is a flowchart of a pipe manufacturing method according to the first embodiment of the present invention, and FIG. 8 is a flowchart showing a dust removing step added to the pipe manufacturing method of FIG.

Referring to FIG. 7, the pipe manufacturing method according to the first embodiment of the present invention can use the pipe manufacturing apparatus according to the first embodiment of the present invention.

In addition, the pipe manufacturing method according to the first embodiment can manufacture a pipe by winding a wall pipe (profile) in which the PE mixture M forms an inner layer and the PE resin R forms an outer layer.

In addition, the wall tube (profile) may include a step (S100) of mixing a raw material and an additive in a mixing portion to produce a PE mixed material (S100), a step of injecting the mixed PE mixed material into an inlet portion of the extruding portion (S120), a step (S130) of injecting the extruded PE mixture into the punching equipped with the die to form the PE mixture, A step (S140) of cooling the PE mixture to the cooling part (S140), and a step (S150) of applying the heated PE resin to the cooled PE mixture.

Specifically, the raw material in step S100 may be wood powder, compressed pulp, or PE resin. 35 to 45 parts by weight of wood powder, 15 to 25 parts by weight of compressed pulp, 25 to 35 parts by weight of PE resin and 5 to 15 parts by weight of additives can be added, preferably 40 parts by weight of wood powder, 20 parts by weight of PE resin, 30 parts by weight of PE resin and 10 parts by weight of additives are added to produce a PE mixed material.

Wood flour is an environmentally friendly natural material used as a strengthening agent to enhance the rigidity of pipes and can be made by pulverizing into fine powder form from recycled wood such as pure wood flour or chips, shaving, and sawdust. Also, the particle size of the wood powder may be 20 to 120 mesh, and the length to diameter ratio of the wood powder may be 3: 1 to 5: 1. (The above-mentioned particle size and diameter ratio are the range that can maximize the price-to-price stiffness effect. When the price is less than 20mesh, the price is high, but the stiffness effect is small compared with the case of 20mesh. have)

Compressed waste can be used as a reinforcing agent to increase the rigidity of pipes, such as wood. Compressed waste paper can be used eco-friendly as well as cost-saving by using recycled materials as in wood.

PE resin is a plastic which has excellent durability, water resistance, dimensional stability, processability, low gloss, and low price. Accordingly, when used together with wood flour and compressed waste paper, it is possible to maximize the advantages (durability, water resistance, dimensional stability, and processability) of plastics and to compensate for the disadvantages of each other, in addition to the advantages of wood powder and waste paper.

In addition, in the case of PE resin, since it can form high adhesiveness with wood powder and compressed waste paper, it can be easily mixed with wood powder and waste paper pulp, and can be easily coated even when it is coated later on the PE mixture.

The additives improve the processing performance, oxidize or enhance the stability to UV, serve as a preservative, and increase the mechanical strength. To this end, the additive may comprise a colorant, a lubricant and a binder.

Here, the coloring agent is for imparting color stability, and the wood contains a substance having high solubility, thereby moving to the surface to cause discoloration and to prevent the wood product from becoming gray.

The lubricant is added to increase the dispersion of the wood powder, and the polymer which is a polymer composed of long rings can be added considering that it is relatively viscous at a high temperature. This can greatly improve the surface properties of the pipe.

Binders can be used to improve the bond strength between plastics and wood. This is because the wood shows a polarity that is hydrophilic and the plastic PE resin is nonpolar because it has a hydrophobic property and can be greatly improved by a new chemical bond at the interface between the two substances by the binder. Here, the binder may be maleated poly-propylene (MAPP), which can increase the bending strength, elastic modulus, dimensional stability, impact strength, and dispersion of wood powder in the pipe.

In addition, the additive may further include other additives not described above. For example, it may be a plasticizer, a hardening agent, a defoaming agent, a thickener, an anti-bacterial agent, and the like.

The above materials may be mixed by a twin screw in the mixing section to produce a PE mixed material.

On the other hand, the raw material may further include natural fiber in addition to wood powder, compression pulp, and PE resin. In addition, the natural fiber may be one of rice hull, rice bran, mackerel, and reed.

The above-mentioned natural fibers are suitable for replacing synthetic resin materials because they are rich in fibers, and they are cheap and easy to purchase. In addition, there is little room for environmental pollution, and it is excellent in strength such as tensile strength, bending strength, impact strength, and the like, and is sufficient for increasing the rigidity of the pipe.

If the amount of the natural fiber is less than 15 parts by weight, the effect of increasing the rigidity is insignificant. If the amount of the natural fiber is more than 25 parts by weight, the cost of the other raw materials The stiffness may be lowered. Preferably, 20 parts by weight of the natural fiber may be added, and it is appropriate to lower the water content to 5% or less.

Step S110 is a step in which the mixed PE mixed material is put into the inlet portion of the extruded portion and melted by the hot wire. At this time, the hot wire can melt the PE mixed material at a temperature of 190 캜 to 200 캜. This is the maximum cost effective effect. When melted at a temperature of less than 190 ° C, the melt temperature is too low to easily cure the PE blend material and melt at temperatures above 200 ° C .

In step S120, the PE mixed material melted by the hot wire is transferred to the extruding part of the extruding part, and then extruded to produce a PE mixture. At this time, the extrusion portion 20 is provided with a transfer screw, and the molten PE mixed material can be transferred from the inlet portion to the outlet portion. Further, the PE mixed material conveyed by the conveying screw 24 can be extruded from the draw-out portion into a PE mixture of a predetermined shape.

The extruded PE mixture may be molded in step S130.

In step S130, the extruded PE mixture is injected into the die provided with the die, and molded.

That is, a die may be provided at the inlet of the vacuum 30, wherein the die is a first die in which the 'k?' Shape is arranged in one row and one row, or a second die in which 'k? It can be a dice. When a first dice arranged in one row and one row is provided in a 'k?' Shape, a double wall tube forming an inner layer of 'k?' Type can be manufactured. A multi-walled tube can be fabricated to form an inner layer in the form of a 'field' when two dice are provided. That is, the shape of the wall can be determined according to the shape of the dice provided in the vacuum 30.

The molded PE mixture may be put into the cooling section in step S140 and cooled.

In addition, the PE mixture injected into the cooling unit 40 and cooled may be coated with the PE resin by the coating unit 60 before being wound by the winding unit 50 in step S150. At this time, PE resin may be applied so that the PE mixture is 70 to 90 parts by weight and the PE resin is 10 to 30 parts by weight. That is, the PE mixture as the inner layer of the wall tube is 70 to 90 parts by weight, and the PE resin as the outer layer is 10 to 30 parts by weight. This is a preferable ratio within the standard of the KS standard.

At this time, the PE resin can be adhered to the PE mixture by applying a predetermined heat by heating the coating portion 60 for supplying and coating the PE resin.

Meanwhile, referring to FIG. 8, the pipe manufacturing method according to the first embodiment of the present invention may further include a dust removing step. Here, the dust removing step can be classified into two stages, step 1 can be performed in the cooling step of the PE mixture in step S140, and step 2 can be performed after cooling the PE mixture in step S140 and thereafter.

Specifically, step S140 may include removing dust by ultrasonic vibration, which is one step of the dust removing step (S142). If the dust or impurities are seated on the surface of the PE mixture, the PE resin is not easily formed due to dust or impurities when coating the PE resin.

The step of removing dust by ultrasonic vibration S142 may be performed by an ultrasonic vibration unit (not shown) included in the cooling unit 40 of the pipe manufacturing apparatus according to the first embodiment.

In step S140 and subsequent steps, a dust suppressing step (S145) for controlling the humidity by injecting water into the water injector, which is the two stages of the dust removing step, may be further included. The cooling unit 40 and the winding unit 50 are constructed in such a manner that the PE mixture moving between the cooling unit 40 and the winding unit 50 of the pipe manufacturing apparatus according to the first embodiment is exposed to the outside. Or at least one water injection device 212 provided above the movement path of the PE mixture.

At this time, the humidity is preferably adjusted to 50% to 65%. This is because when the humidity is less than 50%, dust or impurities are liable to stick to the surface of the PE mixture, and when it exceeds 65%, it is too wet to be coated with the PE resin.

Meanwhile, the dust removing step (S142, S145) has been described so as to perform the steps 1 and 2 in an easy-to-understand manner, but the present invention is not limited thereto, and the steps 1 and 2 may be separately performed. That is, only the dust removing step S142 may be performed by the ultrasonic vibration of the first stage, or the dust suppressing step S145 of adjusting the humidity by spraying water to the water spraying device of the second stage, The dust removing step (S142, S145) of the two stages may be performed.

The wall tube formed through the above process can be directly wound by the winding section 50 to be made into a pipe. At this time, a plurality of injection nozzles 52 for injecting cooling water are provided on one side of the winding unit 50, so that the heat of the pipes generated by overlapping the PE resin can be rapidly cooled.

The pipe produced by winding the wall pipe can be cut by the cut portion 70 to be finally completed.

The finally finished pipe according to the pipe manufacturing method according to the first embodiment includes an inner layer including wood powder, a waste paper pulp, a PE resin, and an outer layer of a PE resin so as to have better rigidity than a conventional pipe. .

Hereinafter, a pipe manufacturing method according to a second embodiment of the present invention will be described with reference to FIG.

9 is a flowchart of a pipe manufacturing method according to a second embodiment of the present invention.

Referring to FIG. 9, the pipe manufacturing method according to the second embodiment of the present invention can use the pipe manufacturing apparatus according to the second embodiment of the present invention.

The pipe manufacturing method according to the second embodiment is different from the pipe manufacturing method according to the first embodiment in that a pipe inner and outer layers are formed , The PE mixture forms the inner layer, and the PE resin can be made to form the outer layer.

Specifically, a step (S200) of mixing the raw material and the additive in the mixing part to produce a PE mixed material (S200), a step (S210) of forming the cylindrical PE mixture by extruding the mixed PE mixed material into the extruding part, A step S230 of coating a PE resin supplied from the resin supply unit to the extruded PE mixture in a mixing space of the coating part to manufacture a pipe S220, cooling the pipe in a cooling part S230, (S240) cutting the cut portion at the cut portion.

In the step S200, 35 to 45 parts by weight of wood powder, 15 to 25 parts by weight of the waste paper, 25 to 35 parts by weight of the PE resin, and 5 to 15 parts by weight of the PE resin are used as the raw materials. Weight parts may be added and mixed.

Here, wood powder and compression pulp are used as reinforcing agents for enhancing rigidity, and PE resin is a plastic that can complement the disadvantages of wood powder while adding the advantages of plastic. The additives can improve processing performance, , Acts as a preservative, and increases the mechanical strength. To this end, the additive may comprise a colorant, a lubricant and a binder.

The raw material may further comprise 15 to 25 parts by weight of natural fiber, and the natural fiber may be one of rice hull, rice bran, mackerel, and reed. This is suitable for replacing the synthetic resin material due to the abundance of the fibers, and a detailed description thereof has been described in the pipe manufacturing method according to the first embodiment, and will not be described below.

The mixed PE mixed material is injected into the extruding part in step S210 so as to be extruded to form a cylindrical PE mixture. Wherein the PE mixture can form the inner layer of the pipe produced by the pipe manufacturing method according to the second embodiment of the present invention.

Here, the extrusion portion is provided with a transfer screw to transfer the PE mixed material from one end to the other end, and the PE mixed material can be extruded at the end to form a PE mixture.

The PE mixture extruded in step S210 may be coated with the PE resin in step S220. Here, the coating of the PE resin can be carried out in the mixing space of the coating part () of the pipe manufacturing apparatus according to the second embodiment of the present invention, thereby forming the inner layer and the outer layer of the pipe.

That is, unlike the pipe manufacturing method of the first embodiment in which the coating of the PE resin is performed after cooling, the pipe manufacturing method of the second embodiment can be performed before cooling.

The PE mixture may be 70 to 90 parts by weight, and the PE resin may be 10 to 30 parts by weight.

Thereafter, cooling and cutting are performed through steps S230 and S240, respectively, and finally, an inner layer including wood powder, compression pulp, a PE resin, and a pipe forming an outer layer formed of a PE resin can be manufactured.

This is advantageous in that it is formed to have a stiffness better than that of the conventional pipe as shown in [Experimental Example 1] described below.

The following examples are illustrative of the present invention, but the present invention is not limited to the following examples.

[Experimental Example 1]

The tensile strength and the impact strength of the pipes of [Examples 1 to 4] manufactured by the pipe manufacturing apparatus and the manufacturing method according to Embodiments 1 and 2 of the present invention were compared with those of Comparative Examples 1 to 3 Example 2] Compared to pipe.

[Example 1]

40 parts by weight of wood pulp, 20 parts by weight of compressed waste paper, 30 parts by weight of PE resin, and 10 parts by weight of additives (coloring agent, lubricant and binder) were mixed, And the outer layer was coated with 20 parts by weight of PE resin to prepare a double-walled tube, which was then wound up to produce a pipe.

[Example 2]

20 parts by weight of wood pulp, 20 parts by weight of compressed wood pulp, 30 parts by weight of PE resin, 20 parts by weight of mushroom with a moisture content of 3% and 10 parts by weight of additives (coloring agent, lubricant and binder) The inner layer was formed with 80 parts by weight of the PE mixture of 'ㅁ' type using the dies arranged in the transverse direction, and 20 parts by weight of the PE resin was added to the outer layer to prepare a double wall pipe.

[Example 3]

40 parts by weight of wood pulp, 20 parts by weight of compressed waste paper, 30 parts by weight of PE resin, and 10 parts by weight of additives (coloring agent, lubricant and binder) were mixed to form an inner layer with 80 parts by weight of a cylindrical PE mixture, And PE resin was weighed in weight to prepare a pipe.

[Example 4]

40 parts by weight of wood pulp, 20 parts by weight of compressed waste paper, 30 parts by weight of PE resin, 20 parts by weight of mushroom with a moisture content of 3% and 10 parts by weight of additives (coloring agent, lubricant and binder) And 20 parts by weight of PE resin was added to the outer layer to prepare a pipe.

[Comparative Example 1]

A double wall tube was used to form a single layer of 'ㅁ' type using polyethylene (PE) resin.

[Comparative Example 2]

A pipe forming a cylindrical single layer was fabricated using only polyethylene (PE) resin.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Tensile Strength (Mpa) 48.9 51.3 43.5 46.7 30.5 27.2 Impact strength (kgcm / cm) 14.6 15.0 14.4 14.7 12.6 11.2

As shown in Table 1, when the inner layer is further formed with the PE mixture to which the wood powder and the pulverized paper are added, the effect is remarkably improved in terms of tensile strength and impact strength.

Further, when natural fiber is further added to wood powder and compressed waste paper, the effect is maximized.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. The embodiments described above are therefore to be considered in all respects as illustrative and not restrictive.

1: pipe manufacturing apparatus according to the first embodiment
10:
12: Hopper
14:
16: Twin screw
20:
22: Heat line
24: Feed screw
30: Jeans study
32:
40:
50:
52: injection nozzle
60: Coating portion
70:
100: pipe manufacturing apparatus according to the second embodiment
120: Extrusion part
130: resin supply part
140: Coating portion
170:
200: vortex generator
210: dust-
212: Water injection device
220:
P: pipe
M: PE mixture
R: PE resin
D1: 1st dice
D2: second dice

Claims (11)

A method for producing a pipe by winding a wall pipe in which a PE mixture forms an inner layer and a PE resin forms an outer layer,
(a) mixing a raw material and an additive in a mixing portion to produce a PE mixed material;
(b) injecting the mixed PE mixed material into an inlet portion of the extruded portion and melting the mixture into hot wire;
(c) transferring the PE mixed material melted by the hot wire to a lead portion of the extruding portion, and then extruding the PE mixed material to produce a PE mixture;
(d) injecting the extruded PE mixture into a die having a die and molding the die mixture;
(e) introducing the molded PE mixture into a cooling section to cool the PE mixture;
(f) adding the cooled PE mixture to the PE resin to form a wall tube;
(g) winding the wall tube to manufacture a pipe, and
(h) cutting the manufactured pipe,
Wherein the raw material includes wood powder, compressed pulp, and PE resin.
A method for producing a cylindrical pipe in which a PE mixture forms an inner layer and a PE resin forms an outer layer,
(a) mixing a raw material and an additive in a mixing portion to produce a PE mixed material;
(b) injecting the mixed PE mixed material into an extruder, melting the extruder by a hot wire, and extruding the extruder through a circular dice coupled to an end of the extruder to form a cylindrical PE mixture;
(c) coating a PE resin supplied from the resin supply part to the extruded PE mixture in a mixing space of the coating part to produce a cylindrical pipe;
(d) cooling the manufactured cylindrical pipe in a cooling section and
(e) cutting the cooled cylindrical pipe at the cutout,
The raw materials include wood powder, compression pulp, PE resin,
The step (a)
Wherein the raw material and the additive are mixed by the rotation of the twin screw provided in the mixing portion, and the raw material and the additive are prevented from sinking or floating by the vortex generating device and mixed.
3. The method according to claim 1 or 2,
The step (a)
Wherein the wood pulp is 35 to 45 parts by weight, the pulverized pulp is 15 to 25 parts by weight, the PE resin is 25 to 35 parts by weight, and the additive is added by 5 to 15 parts by weight.
3. The method according to claim 1 or 2,
Wherein the hot wire melts the PE mixed material at a temperature between 190 and 200 < 0 > C.
3. The method according to claim 1 or 2,
The raw material further comprises natural fibers,
Wherein the natural fiber is one of rice hull, rice bran, mash, and reed.
The method according to claim 1,
The wall-
Wherein the inner layer and the outer layer are formed at a ratio of 70 to 90 parts by weight of the PE mixture and 10 to 30 parts by weight of the PE resin, respectively.
The method according to claim 1,
In the step (c)
It is also possible to manufacture a double-walled tube having a 'd' shape and a first dice arranged in one row and one lateral direction to form a '
And a second dice arranged in two rows and two transverse shapes to form a multi-walled pipe forming an inner layer in the form of a paddle.
The method according to claim 1,
The step (e)
And removing dust by ultrasonic vibration.
The method according to claim 1,
After the step (e)
Further comprising a dust suppressing step of regulating humidity by spraying water with a water spray device.
3. The method of claim 2,
The pipe
Wherein the inner layer and the outer layer are formed at a ratio of 70 to 90 parts by weight of the PE mixture and 10 to 30 parts by weight of the PE resin, respectively.
A PE mixture comprising 35 to 45 parts by weight of wood pulp, 15 to 25 parts by weight of compressed pulverized paper, 25 to 35 parts by weight of PE resin and 5 to 15 parts by weight of an additive, which is prepared by the manufacturing method of claim 1 or 2, 90 parts by weight of an inner layer, 10 to 30 parts by weight of a PE resin to form an outer layer,
Wherein the additive comprises at least one of a colorant, a lubricant and a binder.

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