KR20180101072A - Extrusion molding device, dried-pellet manufacturing device, and method for extrusion molding and for manufacturing dried-pellet using the same - Google Patents

Abstract

In an extruder according to an embodiment, the extruder can comprise: a container into which a raw material is introduced; a conveyor disposed in the container and configured to generate the raw material to be introduced into the container and feed at least a portion of the container in one direction; at least one extrusion hole formed on one side of the container and configured to push the intermediate by the conveying pressure of the conveyor; a cutter disposed on the upstream side of the extrusion hole in the container to cut the intermediate extruded through the extrusion hole; and a hot air blower for supplying hot air toward the extrusion hole.

Description

Technical Field [0001] The present invention relates to an extrusion molding machine, a dry pellet manufacturing apparatus, and a method of manufacturing an extrusion molding method and a dry pellet using the same,

The present disclosure relates to an extrusion molding machine and an extrusion molding method using the same. The present disclosure also relates to a dry pellet production apparatus and a method of manufacturing a dry pellet using the same.

Residues left after extracting bulbous plants such as ginseng or herbs are called pak. Such a foil has an indefinite shape, so that when the foil is put into the dryer as it is, it is difficult to evenly dry the foil to the inside of the foil. In order to uniformly dry the foil, a method of extruding the foil into a pellet shape followed by drying may be considered.

However, herbs such as herbs contain not only herbs but also residues such as roots and leaves, so they contain a large amount of fiber. Since the fiber contains a large amount of water, it may be difficult to cut the pellet during pellet molding. In addition, due to the moisture contained in the pelletized product, the products may adhere to each other or may be attached to the interior of the device such as a conveyor belt.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a pellet- An extrusion molding method, and a method for producing a dry pellet.

An extrusion molding machine according to an embodiment of the present disclosure includes a container into which a raw material is charged, a conveyor that generates raw materials disposed in the container and feeds the raw materials into an intermediate product and transfers at least a part of the intermediate product in one direction, At least one extrusion hole formed in the container so as to be extruded by the conveying pressure of the conveyer, a cutter disposed upstream of the extrusion hole in the container for cutting the intermediate material extruded through the extrusion hole, And a hot air blower for supplying hot air.

In one embodiment, the hot air can be configured to supply hot air to the molded product discharged from the extrusion hole.

In one embodiment, the container may be provided with a hot air passage communicating with the outside of the container so that at least a part of the hot air from the hot air is supplied upstream of the cutter.

In one embodiment, the conveyor includes a screw mounted within the container and rotating about a central axis, the screw crushing and mixing the incoming raw material to produce an intermediate and transferring the resulting intermediate toward the extrusion orifice can do.

In one embodiment, the hot air inlet, which is one end of the hot air passage, is formed outside the radius of at least one extrusion hole around the central axis, and the hot air outlet, which is the other end of the hot air passage, As shown in FIG.

In one embodiment, the at least one extrusion hole may be disposed along the peripheral direction around the central axis.

In one embodiment, the cross section of the extrusion hole may be C-shaped.

In one embodiment, the blow molding section is configured to be surrounded by the extrusion orifice, and the blow molding section may be configured to extend radially outward in the downstream direction.

In one embodiment, the hot air can be detachably attached to the outside of the container on the downstream side of the extrusion hole.

An apparatus for manufacturing a dry pellet according to an embodiment of the present disclosure includes a hopper bin for storing a raw material, a belt press for primarily removing moisture of the raw material, an extrusion molding machine for extruding the raw material into a molded product, And a pre-conditioner which includes a dryer for drying the molded article, and mixes at least a part of the molded article dried by the dryer with the moisture-removed raw material by the belt press.

An extrusion molding method according to an embodiment of the present disclosure includes the steps of feeding a raw material into a container, producing a raw material charged into the container as an intermediate and transferring at least a part of the intermediate product in one direction, To the at least one extrusion hole formed on one side surface of the container, cutting the intermediate material extruded through the extrusion hole, and supplying hot air to the molded article discharged from the extrusion hole.

In one embodiment, after the conveying step, the method may further include supplying hot air to the intermediate through the hot air passage communicating with the outside of the container.

In one embodiment, the step of conveying may comminute and mix the raw materials to produce an intermediate and convey the resulting intermediate toward the extrusion hole.

In one embodiment, the extrusion molding method may further include a step of supplying hot air to the intermediate material through a hot air passage communicating with the outside of the container after the conveying step, wherein after the extruding step, And a step of cutting the molded body extruded through the intermediate body from the intermediate body.

A method of manufacturing a dry pellet according to an embodiment of the present invention includes the steps of storing a raw material in a hopper, firstly dewatering a raw material in a belt press, extruding the raw material into a molded product, A step of drying in a dryer, and a step of storing a dried molded article, wherein the step of dewatering includes a step of dewatering at least a part of the moldings stored in the step of storing between the dewatering step and the extrusion step can do.

According to the extrusion molding apparatus according to one embodiment of the present disclosure, hot air is supplied to the pellet-shaped molding material discharged from the extrusion molding machine to dry the surface of the molding material prior to drying by the dryer of the dry pelletizing apparatus. Accordingly, during the process of transferring the molded article to the dryer for drying, it is possible to prevent the molded articles from sticking to each other or attaching the molded article to the inside of the apparatus such as the conveyor belt.

Further, in the extrusion molding machine according to the embodiment of the present disclosure, hot air is supplied to the surface of the intermediate product before the intermediate product is conveyed by the conveyor and cut by the cutter, so that the surface of the intermediate product before cutting is instantaneously dried. Therefore, the cutting force of the cutting machine can be improved without affecting the pulverization and mixing by the screw of the feeder.

Further, according to the extrusion molding machine according to the embodiment of the present disclosure, the extruded molded product is formed into a cylinder shape having a "C" shape in cross section, and a hollow is formed inside. Therefore, the hot air of the hot air is introduced smoothly into the hollow of the molding, so that the drying efficiency of the molding is further improved.

According to the method of manufacturing a dry pellet according to an embodiment of the present disclosure, the dried molded product and the primary dehydrated raw material can be mixed and re-introduced into the extrusion molding machine. Therefore, it is possible to effectively dry the raw material and improve the productivity without increasing the drying time or using the additional equipment, or requiring a long time for drying due to the high adhesion.

BRIEF DESCRIPTION OF THE DRAWINGS The following drawings, which are incorporated herein by reference, illustrate one embodiment of the disclosure and, together with the detailed description of the invention, serve to provide a further understanding of the technical idea of the disclosure, And shall not be interpreted.
1 is a perspective view schematically showing an apparatus for producing a dry pellet according to one embodiment.
2 is a cross-sectional view of an extrusion molding machine according to one embodiment.
3 is an enlarged cross-sectional view of a portion A in Fig.
Fig. 4 is a front view taken along line IV-IV in Fig. 3; Fig.
Fig. 5 is a perspective view showing a cross section of the extrusion hole of Fig. 4;
6 is an enlarged sectional view of a portion B in Fig.
7 is a perspective view showing a molded product molded through an extrusion molding machine according to an embodiment.
8 is a flowchart showing an extrusion molding method according to an embodiment.
9 is a flowchart showing a method of manufacturing a dry pellet according to an embodiment.

The embodiments of the present disclosure are illustrated for the purpose of describing the technical idea of the present disclosure. The scope of the claims according to the present disclosure is not limited to the embodiments described below or to the detailed description of these embodiments.

All technical and scientific terms used in the present disclosure have the meaning commonly understood by one of ordinary skill in the art to which this disclosure belongs unless otherwise defined. All terms used in the disclosure are selected for the purpose of more clearly illustrating the disclosure and are not chosen to limit the scope of the rights under the present disclosure.

As used in this disclosure, expressions such as " comprising, "" having," "having, " and the like, unless the context requires otherwise, (open-ended terms).

The expressions of the singular forms described in this disclosure may include plural meanings unless the context clearly dictates otherwise, and the same applies to the singular expressions set forth in the claims.

As used in this disclosure, expressions such as " first ", "second ", and the like are used to distinguish a plurality of components from each other and do not limit the order or importance of the components.

&Quot; raw material "used in the present disclosure means a material to be fed into an extrusion molding machine of a dry pellet production apparatus, and" intermediate material "means a raw material, which has been pulverized and mixed by a screw, Quot; molded product "means a final product that is extruded through an extrusion hole, cut by a cutter, and discharged.

The directional directives "downstream" and "downstream" used in this disclosure refer to the direction of flow of raw materials, intermediates and molding starting from the hopper to the reservoir, The opposite direction.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, the same or corresponding components are denoted by the same reference numerals. In the following description of the embodiments, description of the same or corresponding components may be omitted. However, even if a description of components is omitted, such components are not intended to be included in any embodiment.

1 is a perspective view schematically showing an apparatus 1 for producing a dry pellet according to an embodiment.

The dry pellet manufacturing apparatus 1 includes a hopper bin 10 for storing raw materials, a belt press 30 for primarily removing moisture of raw materials, and an extruder 30 for extruding the raw material into a pellet- 100), and a dryer (50) for supplying hot air to dry the molded product (P). The dry pelletizing apparatus 1 may also include a conveying conveyor 20, 22, 24, 28 and a swing conveyor 26 for conveying the raw material or the molded product P between the respective components.

The hopper bin 10 stores raw materials in the form of a lump before molding, and discharges the stored raw materials to the conveying conveyor 20 by a predetermined amount.

The conveying conveyors 20, 22, 24 and 28 can take the form of, for example, an endless track conveyor and can convey the raw material or the molded product P to be conveyed through the belt.

The belt press 30 applies pressure to the raw material transferred through the conveying conveyor 20 to primarily remove moisture from the raw material, and then discharges the raw material to the conveying conveyor 22.

The extrusion molding machine 100 is a component for molding a raw material into a molded article P in the form of a pellet and discharging it to the swing conveyor 26, which will be described in detail below.

Like the conveying conveyor, the swing conveyor 26 may have the same shape as the endless track conveyor. The swing conveyor 26 conveys the molded product P extruded in the extrusion molding machine 100 to the dryer 50.

The dryer (50) supplies hot air to the molded product (P) received through the swing conveyor (26) to dry the molded product (P) to a predetermined level or less. A conveyor for conveying the molded product P is used in the dryer 50, and the belt of the conveyor may be a punched shape.

The dry pellet manufacturing apparatus 1 comprises a crusher 60 for crushing a molded product P dried through a dryer 50, a reservoir 70 for storing the crushed dried product, A conveyance line 80 for conveying the pulverized dried material to the conditioner 40 and a pre-conditioner 40 for mixing the pulverized dried material with the raw material from which the primary moisture is removed from the belt press 30.

The pulverizer 60 receives the molded product P dried in the dryer 50 through the conveying conveyor 28 and crushes it to a predetermined size. The dried material pulverized in the pulverizer 60 is stored in the reservoir 70 and the dried material stored in the reservoir 70 is transferred to the pre-conditioner 40 through the feed line 80.

The pre-conditioner 40 mixes the dried material transferred through the conveying line 80 and the raw material primarily removed from the belt press 30 received through the conveying conveyor 22. Therefore, in the case of a raw material requiring a high adhesion or a long drying time, it is possible to effectively dry the raw material and improve the productivity by mixing the dried raw material with the dried raw material without increasing the drying time or using the additional equipment.

2 is a cross-sectional view of an extrusion molding machine 100 according to one embodiment. 3 is an enlarged cross-sectional view of a portion A in Fig. Fig. 4 is a front view taken along line IV-IV in Fig. 3; Fig.

2, the extrusion molding machine 100 includes a container 110 into which a raw material is charged, a conveyor 120 that generates an intermediate material and transfers the intermediate material to the downstream, At least one extrusion hole 130 formed on a side surface of the extrusion hole 130 and configured to extrude the intermediate product, and a hot air fan 140 for supplying hot air toward the extrusion hole 130.

The container 110 includes an inlet 112 through which the raw material conveyed through the conveying conveyor 24 is introduced into the container 110 through the inlet 112.

The conveyor 120 may include a screw 122 that is rotatably mounted within the container 110. One end of the screw 122 coupled to the inside of the container 110 is connected to a screw driving means (not shown), and the screw 122 is rotated by the screw driving means inside the container 110 And is rotationally driven. The screw 122 is formed into a helical curved shape with the rotation axis C as a center. Accordingly, the rotating screw 122 can crush and mix the raw materials charged into the container 110 to generate the intermediate product, and transfer the intermediate product to the downstream.

The extrusion hole 130 is formed on one side of the container 110 downstream of the screw 122. The intermediate conveyed by the conveyor 120 inside the container 110 is conveyed along the shape of the extrusion hole 130 formed on one side of the container 110 by the conveying pressure by the rotational drive of the screw 122, (110). That is, the cross-section of the molded product P to be extruded is extruded into a shape having the same cross-section as the downstream-side cross-section of the extrusion hole 130. The shape of the extrusion hole 130 will be described in detail below.

The hot air blower 140 is detachably mounted on the downstream side of the extrusion hole 130 from the outside of the container 110. The hot air (140) supplies hot air to the extrusion hole (130) through which the molded product (P) is extruded. Specifically, the hot air fan 140 supplies hot air to the molded product P while the molded product P is extruded in the extrusion hole 130 and dropped on the swing conveyor 26. The hot air fan 140 does not include a separate driving device for generating hot air, and may be in the form of a hot air cover using hot air generated by the dryer 50.

The raw material introduced into the container 100 may contain a predetermined amount of water. Therefore, when the molded product P discharged from the extrusion hole 130 drops onto the belt of the swing conveyor 26, the molded products P are attached to each other or the molded product P is attached to the belt of the swing conveyor 26 . Since the surface of the molded product P is dried by hot air supplied from the hot air blower 140 while the molded product P is discharged from the extrusion hole 130 and dropped onto the swing conveyor 26, It is possible to prevent the molded products P from being adhered to each other due to the water contained in the surface of the molded product P or sticking the molded product P to the belt of the swing conveyor 26. [ Further, when the molded article P falls from the swing conveyor 26 to the conveyor in the drier, the phenomenon of sticking to the belt of the conveyor can be prevented.

2 and 3, the extrusion molding machine 100 includes a cutter 150 for cutting an intermediate material extruded through the extrusion hole to a predetermined size, and a hot air passage 160 communicating with the outside of the container 110 .

The cutter 150 is disposed downstream of the screw 122 and upstream of the extrusion hole 130. Further, the cutter 150 is connected to the downstream end of the screw 122, and is rotationally driven together with the screw 122 about the central axis C by the screw driving means. The cutter 150 includes at least one blade 152 extending radially outwardly from the central axis C. Therefore, the intermediate conveyed by the screw 122 is extruded through the extrusion hole 130 by the conveying pressure, and the intermediate exiting through the extrusion hole 130 passes through the blade 152 of the rotating cutter 150 ).

The hot air passage 160 is a cylindrical passage communicating between the outside of the container 110 and the inside thereof. The hot air inflow port 162 which is one end of the hot air passage 160 connected to the outside of the container 110 has a peripheral portion outside the radius of the extrusion hole 130 on one side of the container 110 having the extrusion hole 130 formed therein (See Fig. 4). The hot air passage 160 extends from the hot air inlet 162 inside the container 110 to the upstream side. The hot air outlet 164, which is the other end of the hot air passage 160 connected to the inside of the container 110, is formed in a radially inward direction. Further, the hot air outlet 164 is formed to be located upstream of the cutter 150. Therefore, at least a part of the hot air supplied from the hot air blower 140 flows into the hot air passage 160 through the hot air inflow port 162 and is supplied to the intermediate product before being cut by the cutter 150 through the hot air outflow port 164 do. Therefore, since the surface of the intermediate product before being cut by the cutter 150 is instantaneously dried by the hot air, the cutting of the intermediate product can be facilitated. Particularly, since the residues such as bulbous plants and herbaceous plants contain moisture as a fiber, moisture contained in the surface of the intermediate material can be instantaneously dried by supplying hot air, so that the cutting force of the cutter 150 is further improved Can be obtained.

As shown in Fig. 4, a plurality of extrusion holes 130 are arranged along the circumferential direction around the center axis C on one side of the container 110. As shown in Fig. In addition, a plurality of rows of extrusion holes 130 may be arranged in the radially outward direction from the central axis C.

Outside a radius of the extrusion hole 130, a ring-shaped hot air inlet 162 is disposed along the peripheral edge of one side of the container 110. That is, since the hot air passage 160 is disposed at the periphery of the inside of the container 110, the sectional area of the hot air passage 160 is widened, and a larger amount of hot air can be supplied to the intermediate material, . The arrangement of the feeder 120, the extrusion hole 130, the cutter 150 and the like is not hindered, so that the arrangement of the extrusion molding machine 100 inside the container 110 can be efficiently performed.

5 is a perspective view showing a cross section of the extrusion hole 130 of FIG. 6 is an enlarged sectional view of a portion B in Fig. 7 is a perspective view showing a molded product P molded through the extrusion molding machine 100 according to one embodiment.

As shown in Fig. 5, the extrusion hole 130 may be formed, for example, substantially in a "C" shape for efficient drying of the molded product P. The hollow molding part 132 may be formed in a shape surrounded by the " C "-shaped extrusion hole 130, and may have an inverted triangular shape with its lower side opened.

6, the hollow-formed portion 132 may be formed in a shape extending radially outward along the downstream direction from the upstream end portion 134. As shown in Fig. Therefore, since the intermediate material conveyed by the conveying pressure of the screw 122 is introduced into the extrusion hole 130 while being cut by the upstream side end portion 134 of the hollow forming portion 132, the intermediate material can be more easily extruded .

As another example, the "C" shape of the extrusion hole 130 may have a different shape. For example, the outer shape of the extrusion hole 130 may have an elliptical shape, a semicircular shape, a triangular shape, or a rectangular shape instead of a substantially circular shape such as a "C " The extrusion hole 130 may have any shape such that the molded product P extruded through the extrusion hole 130 has a hollow inside to widen the surface area in contact with hot air.

The hollow molding part 132 may be circular, elliptical, semicircular, or quadrangular with the lower side opened, although the lower molding part 132 is illustrated as an inverted triangular shape with the lower side opened. The hollow forming portion 132 may have any shape such that it extends radially outward from the upstream end 134 in the downstream direction.

As shown in Fig. 7, the molded product P extruded through the extrusion holes 130 is formed into a cylinder shape having a "C" shape in cross section, and a hollow (V) do. That is, since the molded product P extruded through the extrusion hole 130 according to the embodiment has a larger surface area than the molded product having the same volume, the molded product P is discharged from the extrusion hole 130 The hot air can be smoothly introduced into the hollow V of the molded product P during the dropping into the swing conveyor 26, so that the molded product P can be dried more effectively. Therefore, the phenomenon that the molded product P adheres to the belt of the swing conveyor 26 or the molded products P adhere to each other can be prevented more effectively.

8 is a flowchart showing an extrusion molding method (S100) according to an embodiment.

The extrusion molding method (S100) according to one embodiment includes a step of injecting a raw material into the container 110 (S110), a step of forming a raw material in the feeder 120 as an intermediate product, (S140) of pushing the intermediate product through the extrusion hole 130 by the feed pressure of the feeder 120, cutting the intermediate product extruded through the extrusion hole 130 (S150) And a step S160 of supplying hot air to the formed article P discharged from the extrusion hole 130 and falling down.

The step of transferring the intermediate product (S120) comprises crushing and mixing the introduced raw material with the screw 122 to produce the intermediate product, and to transfer the produced intermediate product to the extrusion hole 130.

The extrusion molding method S100 according to an embodiment includes a step S130 of supplying hot air to the intermediate product through the hot air passage 160 communicating with the outside of the container 110 after the step S120 of conveying the intermediate product S130 ).

9 is a flowchart showing a method (S10) for producing a dry pellet according to an embodiment.

The method (S10) for manufacturing a dry pellet according to an embodiment includes a step S11 of storing a raw material in a hopper bin 10, a step S12 of dewatering a raw material primarily in the belt press 30, A step S13 of drying the extruded molded product P in the dryer 50 and a step of storing the dried molded product P in the reservoir 70 (S14).

The method 10 for manufacturing a dry pellet according to an embodiment is characterized in that at least a part of the molded articles P stored in the storing step S14 is dehydrated between the dehydrating step S12 and the extrusion molding step S100, And a step S15 of mixing the raw material with the raw material through the step S12. That is, the dried molded article P and the raw material primarily dehydrated can be mixed and re-introduced into the extrusion molding machine 100. Therefore, in the case of a raw material requiring a high adhesion or a long drying time, the raw material can be effectively dried and the productivity can be improved by mixing with the already dried molding (P) without increasing the drying time or using additional equipment.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. For example, it is contemplated that the techniques described may be performed in a different order than the described methods, and / or that components of the described structures, devices, and the like may be combined or combined in other ways than the described methods, Appropriate results can be achieved even if they are replaced or replaced.

Therefore, other implementations, other embodiments and equivalents to the claims are within the scope of the following claims.

1 ... Dry pellet manufacturing apparatus 10 ... hopper bin 20, 22, 24, 28 ... conveying conveyor 26 ... swing conveyor 30 ... belt press 40 ... preconditioner, 50 ... dryer, 60 ... grinder, 70 ... reservoir, 80 ... feed line, 100 ... extruder, 110 ... container, 112 ... inlet, 120 ... feed A blower for blowing air into the extruder through the extruder; ... hot air passage, 162 ... hot air inlet, 164 ... hot air outlet, C ... center axis, P ... molded article, V ... hollow

Claims (14)

A container into which raw materials are injected,
A conveyor for conveying at least a part of the intermediate material in one direction,
At least one extrusion hole formed on one side surface of the container and adapted to be pushed out by the conveying pressure of the conveyer,
A cutter disposed upstream of the extrusion hole in the container for cutting an intermediate product extruded through the extrusion hole,
And a hot air blower for supplying hot air toward the extrusion hole,
Extruder. The method according to claim 1,
Wherein the hot air is configured to supply hot air to a molded product discharged from the extrusion hole,
Extruder. The method according to claim 1,
Wherein the container is provided with a hot air passage communicating with the outside of the container so that at least a part of the hot air from the hot air is supplied to the upstream of the cutter,
Extruder. The method of claim 3,
Wherein the conveyor comprises a screw mounted within the container and rotating about a central axis,
Wherein the screw is formed by crushing and mixing raw materials to be introduced to produce an intermediate product and transferring the produced intermediate product toward the extrusion hole,
Extruder. 5. The method of claim 4,
The hot air inlet being one side end of the hot air passage is formed outside the radius of the at least one extrusion hole about the central axis,
Wherein the hot air outlet which is the other end of the hot air passage is formed in a direction radially inward from the upstream of the cutter,
Extruder. 5. The method of claim 4,
Wherein the at least one extrusion hole is disposed along the peripheral direction around the central axis,
Extruder. The method according to claim 1,
The cross-section of the extrusion hole is a C-
Extruder. 8. The method of claim 7,
And the hollow molding section is surrounded by the extrusion hole,
Wherein the hollow forming portion is configured to expand in a radially outward direction in a downstream direction,
Extruder. The method according to claim 1,
Wherein the hot air is detachably attached to the outside of the container on the downstream side of the extrusion hole,
Extruder. A hopper bin storing the raw material,
A belt press for primarily removing moisture of the raw material,
An extrusion molding machine according to any one of claims 1 to 9,
A drying pellet production apparatus comprising a dryer for drying a molded product extruded from an extrusion molding machine,
Wherein the dry pelletizer comprises a pre-conditioner for mixing at least a portion of the moldings dried by the dryer with the moisture removed raw material by the belt press,
Dry pellet manufacturing apparatus. Feeding a raw material into a container,
Producing a raw material charged into the vessel as an intermediate and transferring at least a part of the produced intermediate in one direction,
Extruding the intermediate into at least one extrusion hole formed on one side of the container by the transfer pressure,
Cutting an intermediate product extruded through the extrusion hole,
And supplying hot air to a molded product discharged from the extrusion hole.
Extrusion molding method. 12. The method of claim 11,
Further comprising the step of supplying hot air to the intermediate through the hot air passage communicating with the outside of the container after the conveying step,
Extrusion molding method. 12. The method of claim 11,
Wherein the transferring step comprises grinding and mixing the raw material to produce an intermediate product and transferring the produced intermediate product toward the extrusion hole,
Extrusion molding method. Storing the raw material in a hopper,
A step of primarily dehydrating the moisture of the raw material in a belt press,
An injection molding method comprising: an extrusion molding step according to any one of claims 11 to 13;
Drying the extruded molding in a dryer,
And storing the dried molding,
Mixing at least a part of the moldings stored in the storing step with the raw material having undergone the dewatering step between the dewatering step and the extrusion molding step,
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