JP2023088431A - Oil press and pelletizing equipment and oil press and pelletizing method - Google Patents

Abstract

To provide the oil press and pelletizing equipment and the oil press and pelletizing method, and solid materials containing oil are pressed for oil while being continuously conveyed, and the solid materials after oil extraction are converted to pellet products on the spot for reuse.SOLUTION: A feeding section 22 is provided to feed oil-containing solid material into the barrel, an oil press section 24A-24C is provided to press oil from the oil-containing solid material fed by the feeding section, an oil collection section 26A-26C is provided to collect the pressed oil, and a heating section is provided to heat the oil-containing solid material to a temperature lower than the melting point of the solid material or the allowable heating temperature of oil before pressing by the oil press section 24, so that the solid material is softened to the lower of the oil press section and the oil-containing solid material is pressed by the oil press section. The extrusion section is provided downstream of the pressing section to extrude the solid material after pressing. The oil press and pelletizing equipment 10 is characterized in that it cuts the solid material extruded outwardly in the form of strands by the extrusion section to make a pellet product.SELECTED DRAWING: Figure 1

Description

The present invention relates to an oil-extracting/pelletizing apparatus and an oil-extracting/pelletizing method, and more particularly, while extracting oil while continuously conveying an oil-containing solid material, the solid material after oil extraction is pelletized on the spot. It relates to an oil extraction and pelletization device and an oil extraction and pelletization method that can be reused by

2. Description of the Related Art Conventionally, oil extraction techniques have been used to recover oil from natural products such as plants, or from artificial products such as foods and industrial products.
For example, as disclosed in Patent Literature 1, a technique has been used in which an object to be oil-pressed is put in a container and pressed in a batch manner to extract oil.
More specifically, an object to be oil-pressed is placed in a container, pressed in the container, separated into oil and solid matter, and the extracted oil is recovered. The oil is extracted by squeezing.
According to such a technique, it is possible to reliably press the object to be oil-pressed in the container. It is inefficient in that it is necessary to put it in a container and continuous oil extraction is not possible.

In this regard, Patent Documents 2 and 3, for example, disclose techniques for extracting oil from seeds using an extruder for recovering vegetable oil.
In Patent Document 2, a so-called extrusion device has a rotating shaft extending in the longitudinal direction of the barrel and a screw element fitted on the rotating shaft in the barrel, and supplies an oil-containing solid material into the barrel. an oil-squeezing unit for extracting oil from the oil-containing solid material supplied by the supplying unit; and a heating unit for heating the oil-containing solid material until it is squeezed by the oil-squeezing unit. Downstream, the oil is extracted from the seed by applying back pressure to the material via a reverse feeding screw.

In Patent Document 3, similarly to Patent Document 2, a so-called extrusion device is used to have a rotating shaft extending in the longitudinal direction of the barrel and a screw element fitted onto the rotating shaft in the barrel. a feeding section for feeding the oil-containing solid material into the barrel; an oil-squeezing section for extracting oil from the oil-containing solid material supplied by the feeding section; and heating the oil-containing solid material until it is compressed by the oil-squeezing section. A heating section is provided, and at the most downstream section, the oil is extracted from the seed by applying a back pressure to the material using a pressure regulator.

In particular, Patent Documents 2 and 3 both utilize a twin-screw co-rotating extruder, each of which has a screw fitted onto each of the twin-screw rotating shafts extending axially parallel and spaced from each other within a barrel. However, by rotating the screws by rotating the two rotating shafts in the same direction, it is possible to continuously convey the object in the axial direction while continuously supplying the object into the barrel.
However, if the object to be oiled is to be oiled by such a twin-screw co-directional extruder, the object is continuously conveyed, and the shearing of the object generated at the meshing portion of the corresponding screws of each rotating shaft is reduced. While dynamic pressing is possible to some extent using such shearing, the object is heated, possibly causing thermal degradation of the oil to be pressed. In this regard, if the screw rotation speed is reduced in order to suppress the thermal deterioration of the oil, the oil recovery efficiency will be lowered.
Furthermore, since the clearance between the screws is large, the self-cleaning property is poor, so the solid material remains adhered to the outer surface of the screw and deteriorates due to heat. There is also the risk of contamination.

In addition to the above, in such a conventional oil extraction technique, the oil-containing solid material is continuously supplied from the supply unit, and the oil is extracted while it is conveyed in the longitudinal direction of the barrel by the rotation of the screw element. However, it does not target oil-containing solid materials that melt with heat, and has the following technical problems.
Originally, as far as plant seeds are concerned, dregs such as seed coats after oil extraction are not subject to reuse, but are subject to disposal as residues.
It is difficult to separate the oil recovered by oil extraction from the seed coat-containing residue from which the oil has been recovered, and to push out only the object after oil extraction as it is on the downstream side. .
As described above, in such conventional oil extraction techniques, for example, while recovering oil, oil is collected from oil-containing solid materials such as thermoplastic resins and similar substances such as paraffin-containing polyethylene oil-containing solid material sheets. There is no mention of any suggestion or idea of turning the fixed material into a reusable product on the spot.

Utility Model Registration No. 3195337 JP-A-61-31496 Japanese Patent Application Laid-Open No. 07-197074

In view of the above technical problems, the object of the present invention is to extract oil while continuously conveying the oil-containing solid material, and to make the solid material after oil extraction on the spot into pellet products for reuse. An object of the present invention is to provide a combined pelletizing device and a combined oil extraction and pelletizing method.
In view of the above technical problems, the object of the present invention is to suppress thermal deterioration to ensure the recovery of high-quality oil, and to reuse the solid material after oil extraction on the spot by converting it into pellet products. To provide an oil extracting/pelletizing device and an oil extracting/pelletizing method.

In order to solve the above problems, the oil extraction and pelletization device of the present invention is
a rotatable shaft extending longitudinally within the barrel;
a screw element fitted onto the rotating shaft;
A supply unit that supplies the oil-containing solid material into the barrel, an oil extraction unit that extracts oil from the oil-containing solid material supplied by the supply unit, an oil recovery unit that recovers the extracted oil, and the oil extraction unit. A heating unit that heats the oil-containing solid material to a softened state below the lower temperature of the melting point of the solid material or the allowable heating temperature of the oil before being compressed by
In the pressing section, the screw element is a pressing screw element capable of pressing an oil-containing solid material,
The oil recovery part is provided laterally with respect to the longitudinal direction of the barrel so as to recover only the extracted oil that accumulates in the lower part of the barrel. An outflow opening for oil is provided in the vicinity,
Furthermore, an extrusion unit for extruding the solid material after oil extraction is provided downstream of the oil extraction unit,
In the vicinity of the extruding part, a melting part for heating the solid material after oil extraction to a molten state is provided,
The solid material extruded to the outside in a strand shape by the extruding section is cut to form a pellet product.
An oil extracting and pelletizing device characterized by:

According to the oil extraction and pelletization apparatus having the above configuration, the oil-containing solid material supplied from the supply unit into the barrel is heated while being conveyed downstream in the longitudinal direction of the barrel by the rotation of the rotating shaft, that is, the screw element. By the unit, the oil-containing solid material is heated to the melting point of the solid material or the allowable heating temperature of the oil, whichever is lower, so that the oil-containing solid material is softened. Only the extracted oil accumulated in the lower part of the barrel is recovered by the oil recovery section through the oil outflow opening, while the solid material after oil extraction is recovered in the extrusion section downstream of the oil extraction section. , It is melted by the melting part near the extruding part, extruded to the outside in a strand shape, and cut into pellet products. While extracting oil while conveying the material continuously, the solid material after oil extraction can be made into pellet products on the spot and reused.

In addition, the barrel has a cocoon shape in which two cylindrical cylinders are connected in parallel in the longitudinal direction, and a pair of circular arc portions are continuous in a cross section orthogonal to the longitudinal direction,
each of the rotating shafts extends longitudinally within a corresponding cylindrical cylinder concentrically therewith;
Two rotating shafts spaced apart from each other by a predetermined distance and rotatable in the same direction about the longitudinal direction,
each of the screw elements forms a pair that is fitted onto each of the two rotating shafts;
Preferably, the pair of screw elements are identical to each other, are provided at the same position in the longitudinal direction of the barrel, and are arranged to mesh with each other at a predetermined interval between the two rotary shafts.

Furthermore, the oil extraction unit has a conveying unit and a compression unit that are arranged adjacent to each other in the longitudinal direction,
In the conveying portion, the pair of screw elements are conveying screw elements capable of conveying the oil-containing solid material to the downstream side in the longitudinal direction of the barrel,
The cross-sectional area of the oil-containing solid material configured between the outer surface of the screw element for compression and the inner surface of the barrel is configured between the outer surface of the screw element for conveying and the inner surface of the barrel. It is preferably set to be smaller than the channel cross-sectional area of the oil-containing solid material.

Furthermore, said squeezing screw element has a circular opening into which said rotating shaft fits and is longitudinally stacked with discs having two or more tips in the circumferential direction, corresponding tips of longitudinally adjacent discs. may be of the longitudinally discontinuous type, offset in the circumferential direction, such that the center of the circular opening is offset with respect to the center of the barrel.
In addition, the squeezing screw element is monolithic with a circular opening into which the rotating shaft fits, and has two or more circumferential tips on each of its longitudinally spaced end faces, and a may be of the longitudinally continuous type provided with helical leads that connect to tips on both end faces, the center of said circular opening being offset with respect to the center of said barrel.

Moreover, it is preferable that a plurality of the oil extraction units be provided in series in the longitudinal direction of the barrel, and the extrusion unit be provided downstream of the most downstream oil extraction unit.
Further, the oil recovery unit is provided with a casing that is connected to the oil outflow opening and has the oil recovery opening, and a screw that is provided in the casing and rotates in a forward direction toward the oil outflow opening. Through the oil recovery opening, the extracted oil should be recovered, and the extracted oil-containing solid material should not be recovered.
Furthermore, the oil-containing solid material may be a thermoplastic resin.

In order to solve the above problems, the oil extraction and pelletization method of the present invention is
While continuously transporting the oil-containing solid material impregnated with oil in the closed space in the forward direction along the extension direction of the closed space, the melting point of the solid material or the allowable heating temperature of the oil, whichever is lower heating the oil-containing solid material to a temperature below the temperature so that the oil-containing solid material is in a softened state;
By forming a pressure barrier on the downstream side of the sealed space, the oil-containing solid material is compressed while increasing the filling degree of the heated oil-containing solid material in the sealed space on the upstream side of the pressure barrier, and the oil is removed only by squeezing. extracting oil;
While continuously recovering the extracted oil, the solid material after oil extraction is melted and extruded to the outside in a strand shape;
cutting and pelletizing the extruded solid material;
It has a configuration.

Also, in the pelletizing step, it is preferable to cut the extruded solid material after air-cooling or water-cooling so that it can be cut into predetermined lengths in the longitudinal direction.
Further, the oil-containing solid material may be a thermoplastic resin.

The oil extraction/pelletization apparatus and the oil extraction/pelletization method of the present invention will be described in detail below with reference to the drawings.
As shown in FIGS. 1 to 3 , the oil extraction and pelletization device 10 includes a supply section 22 that supplies the oil-containing solid material M into the barrel 16, and an oil content O from the oil-containing solid material M supplied by the supply section 22. , an oil recovery unit 26 for recovering the extracted oil O, and the melting point of the solid material or the allowable heating temperature of the oil O before being squeezed by the oil extraction unit 24, whichever is lower. It is roughly composed of a heating section 28 for heating the oil-containing solid material M up to a temperature of 100 to 100 psi and an extrusion section 33 for extruding the oil-extracted residual solid material M to the outside.
More specifically, a barrel 16 for conveying the oil-containing solid material M is provided inside, and a cylinder 12 extending in the longitudinal direction X supported by a stand 25 is provided at appropriate intervals. An extruding portion 33 is provided at the other end of the portion 22 and the cylinder 12, and an oil extracting portion 24 and a heating portion 28 are provided in the longitudinal direction X from one end to the other end. An oil recovery section 26 is provided on the side in a direction orthogonal to the longitudinal direction X of the cylinder 12, and the oil-containing solid material M supplied from the supply section 22 is conveyed downstream in the longitudinal direction X within the barrel 16. While the oil content O that is heated, oil-extracted, and oil-extracted is recovered, the oil content O-extracted residual solid material M is extruded to the outside.

As shown in FIG. 4, the barrel 16 connects two cylindrical cylinders 13 in parallel in the longitudinal direction, and in a cross section orthogonal to the longitudinal direction X, has a cocoon shape in which a pair of circular arc portions 14 are continuous. In the cylindrical cylinder 13, two rotating shafts 18 extending in the longitudinal direction X concentrically with the cylindrical cylinder 13 and rotatable about the longitudinal direction X are provided at a predetermined distance from each other. As usual, each rotating shaft 18 is rotatably supported by, for example, a bearing (not shown) so as to be rotatable about the longitudinal direction X, and each rotating shaft 18 is connected to a rotating drive motor 19 via a rotation transmission mechanism 21 in the same direction. coupled for synchronous rotation.
In each of the two rotating shafts 18, a pair of screw elements 20 (including a conveying screw element 20A and a compressing screw element 20B, which will be described later) are rotatable about the longitudinal direction X of the rotating shaft 18. For example, the pair of screw elements 20 are spline-fitted on the outer peripheral surface of the rotating shaft 18, are made of metal, are identical to each other, and are provided at the same position in the longitudinal direction X of the barrel 16, and are biaxial rotating shafts. 18 are arranged to mesh with each other with a predetermined interval D (see FIG. 6).
2 (C1 to C12), the cylinder 12 is divided longitudinally with a barrel 16 (described later) formed therein, and an overhanging flange 41 is provided at the end face of each divided portion. , longitudinally adjacent split portions are screwed together in a liquid-sealing manner via screw holes 43 (FIG. 4) provided in the overhanging flange 41, and each split portion, except for the pushing portion, is connected to the conveying portion. , oil extraction unit. This is effective when inspecting or replacing the screw elements 20 in the barrels 16 corresponding to the conveying section and the oil squeezing section.

The oil-containing solid material is arbitrary as long as it is a solid material that contains oil and is softened by heating, and is an industrial material, natural product, or food residue, and is in the form of bulk, pellet, or flake. , granular or powdery.
In particular, as will be described later, from the viewpoint of extruding the oil-extracted solid material as it is into a strand, pelletizing it and making it reusable, for example, a thermoplastic resin is preferable, and the oil-containing solid material may be an industrial waste material. .
The raw material supply unit 10 includes a hopper 23 , a conventionally known coil feeder (not shown), a shooter (not shown), and a forced feeder (not shown). ing.
The coil feeder at the bottom of the hopper 23 supplies the oil-containing solid material M introduced into the hopper 23 to the shooter. A compulsory feeder having a capacity is inserted so that the amount of oil-containing solid material M fed into the barrel 16 per hour can be set. As a modification, the hopper 23 may be directly connected to the material supply port 31 without going through the shooter.

The heating unit 28 is configured to externally heat the oil-containing solid material M in the barrel 16 via the inner surface of the barrel 16 by a conventionally known heater provided inside the cylinder 12, and the oil-containing solid material M The oil-containing solid material M is heated to the melting point of the solid material or the allowable heating temperature of the oil O, whichever is lower, before reaching the oil extraction unit 24, which will be described later.
As a result, when the oil-containing solid material M reaches the oil extraction part 24, the oil-containing solid material M is softened so as to be squeezed, and the oil-containing solid material M is overheated so that the extracted oil O is not thermally deteriorated. Alternatively, by preventing the heat-degraded solid material M from mixing with the extracted oil O, the quality of the oil O is ensured. As described above, the heating temperature of the heating unit 28 is preferably set according to the types of the oil-containing solid material M and the oil O.
The extruding part 33 is provided with a die 35 in the same manner as that used in conventional melt-kneading extruders, and squeezes the residual solid material M after the oil content O oil extraction and extrudes it to the outside.

As shown in FIG. 1, a plurality (three units) of the oil squeezing units 24 are provided in series in the longitudinal direction X, and each of the oil squeezing units 24 is provided with the conveying unit 30 and the squeezing unit 32 adjacent to each other from the upstream side to the downstream side. It is
Since the pair of screw elements 20 provided on the rotary shaft 18 to which each screw element 20 corresponds are identical to each other, one of them will be described below.
In the conveying portion 30, the pair of screw elements 20 are conveying screw elements 20A capable of conveying the oil-containing solid material M downstream in the longitudinal direction X of the barrel 16. The conveying screw elements 20A are conventionally known full A flight screw is fine.
In the compressing section 32, the pair of screw elements 20 are compressing screw elements 20B capable of compressing the oil-containing solid material M, respectively.
As shown in FIG. 5, the squeezing screw element 20B has a circular opening 48 into which the rotary shaft 18 fits, and discs 52 having two or more tips 50 circumferentially stacked in the longitudinal direction X (FIG. 5 , 7), the corresponding chips 50 of discs 52 adjacent in the longitudinal direction X are of the circumferentially offset, discontinuous type in the longitudinal direction X, with respect to the center of the barrel 16 of the circular opening 48. The center is offset. More specifically, the number of discs 52 provided at each end is three, and the number of discs 52 provided between the two ends is four. Each disk 52 has an uneven contact surface so that adjacent disks 52 in the longitudinal direction are fitted and fixed.
As will be described later, the thickness t of each disk is preferably determined from the viewpoint of adjusting the time for the oil-containing solid material M to pass through the compressing screw element 20B by the longitudinal length L of the compressing screw element 20B. .
Similar to the conveying screw element 20A, the compressing screw element 20B is configured to convey the oil-containing solid material M downstream in the longitudinal direction X by rotating the rotating shaft 18 about the axial direction. 52 is inclined in the axial direction of the rotary shaft 18 (the inclination is omitted in the drawings).
In each of the divisions C4, C7 and C9 of the barrel 16, two sets of squeezing screw elements 20B shown in FIG. 5 are arranged longitudinally in series.

As shown in FIG. 8, each of the four discs 52 has an outer peripheral edge formed by a combination of arcs, and four chips 50 are arranged at predetermined intervals in the circumferential direction. , one defined by the tip angle .THETA.2 greater than .THETA.1 and the other two defined by the tip angles .THETA.1, .THETA. The channel cross-sectional area SA defined between them is divided by the chips 50 in the same manner as the three discs 52 .
The arrangement of the chips in the circumferential direction and the angle of the chips may be determined from the viewpoint of achieving a desired degree of compression of the oil-containing solid material M, like the amount of eccentricity d.
The two sets of squeezing screw elements 20B are respectively attached to the rotating shaft 18 in such a manner that the most downstream three-start disc 52 of the upstream set and the most upstream three-start disc 52 of the downstream set abut against each other. The three-row disk 52 on the most downstream side and the three-row disk 52 on the most upstream side, which are connected, may be brought into contact while being shifted in the circumferential direction of the rotary shaft 18, or may be brought into contact without being shifted in the circumferential direction. good. On the other hand, the most upstream 3-start disc 52 of the upstream set and the most downstream 3-start disc 52 of the downstream set are respectively in contact with the end face of the adjacent conveying screw element 20A. 18, respectively.

As described above, the three-row discs 52 at both ends of the compressing screw element 20B are provided from the standpoint of ease of assembly of the compressing screw element 20B. One or both of the 3-start discs 52 may be 4-start as well as the middle 4-start disc 52, or all or part of the middle 4-start disc 52 may be replaced by both end 3-start discs 52. Similarly, it is good also as 3 articles.
As for the screw element for squeezing which is composed of seven discs shown in FIG. 4, and the cross-sectional area of the flow path is smaller than that on both end faces, and the oil-containing solid material is subjected to a greater compressive force, including in the radial direction, while passing between both end faces. is loaded. In this way, by individually setting the number of threads of each disc, the narrowing of the cross-sectional area of the flow passage for the conveying screw element arranged adjacently on the upstream side can be adjusted. It is possible to adjust the application of the squeezing force, including in the radial direction, and thus the degree of squeezing.
On the one hand, by setting the thickness of each disc individually, it is possible to adjust the squeezing time during which the oil-bearing solid material passes through the squeezing screw elements, and thus likewise to adjust the degree of squeezing. be.
In addition, as described above, by displacing the tips in the circumferential direction between the adjacent discs of the squeezing screw element, the softness is reduced compared to the case where the positions of all the adjacent discs and the chips are aligned in the circumferential direction. When the hardened oil-containing solid material M flows through the flow path between the inner surface 36 of the barrel 16 and the outer surface of the squeezing screw element 20B, there is resistance to the flow of the oil-containing solid material M, possibly causing turbulence. As a result, the degree of squeezing is improved and the oil squeezability is further increased. Therefore, the angle at which the chip positions are shifted in the circumferential direction between adjacent discs is preferably determined from this point of view. Ten degrees.

As shown in FIG. 6, in each compressing screw element 20B, an outer peripheral closed curve portion 40 that forms a cross-sectional outline perpendicular to the longitudinal direction X of the barrel 16 is rotated around the rotation shaft 18 of the compressing screw element 20B. A region formed between the outer peripheral closed curve portion 40 and the arc portion 14 is divided into a plurality of partial regions 42 while maintaining a predetermined distance d between the outer peripheral closed curve portion 40 and the arc portion 14. The outer peripheral closed curve portion 40 is non-circular and the corresponding rotation axis of the rotating shaft 18 is an arc so that the area of the region 42 increases or decreases in accordance with the rotation of the screw element 20B for compression about the rotating shaft 18. It is concentric with the center of the portion 14 .
More specifically, the region formed between the outer peripheral closed curve portion 40 and the arc portion 14 is divided into five regions SA1 to SA5 as partial regions 42, and shown in FIGS. , the areas of SA1 to SA5 increase and decrease as the rotating shaft 18 rotates.
The predetermined distance d is preferably as small as possible (for example, 0.2 mm or less) within the range where the tip of the tip 50 does not come into contact with the inner surface 36 of the barrel 16. is divided, when the total area of the flow path cross-sectional areas SA1 to SA5 is set to be smaller than the total area of the conveying section adjacent to the upstream side in the longitudinal direction, the oil content in each of the flow path cross-sectional areas SA1 to SA5 Effective for squeezing.
The above points are the same for the channel cross-sectional area SA formed by the four discs 52 provided between the ends of each of the pair of compressing screw elements 20B.

The cross-sectional area SA of the oil-containing solid material M, which is formed between the outer surface 34 of the screw element 20B for compression and the inner surface 36 of the barrel 16, is the outer surface 34A of the screw element 20A for conveying and the inner surface 36 It is set to be smaller than the flow passage cross-sectional area SA of the oil-containing solid material M configured between. As a result, as will be described later, the softened oil-containing solid material M is conveyed from the conveying section 30 to the compressing section 32 and compressed including in the radial direction. The cross-sectional area SA of the oil-containing solid material M is preferably determined from this point of view.

More specifically, the cross-sectional area SA (SA1 to SA5 ) is set smaller than the cross-sectional area SA of the channel cross section formed between the inner surface 36 of the barrel 16 shown in FIG. 7 and the outer surface 34A of the conveying screw element 20A, whereby In the conveying section 30, the oil-containing solid material M conveyed by the rotation of the conveying screw element 20A adjacent on the upstream side in the longitudinal direction of the barrel 16 flows into the compressing section 32, and is moved downstream by the rotation of the compressing screw element 20B. The oil content is extracted from the oil-containing solid material M while being conveyed in the direction, including the radial direction, and the oil content is recovered on the spot by the oil recovery unit 26. The oil-containing solid material M after oil extraction is It is configured to be conveyed to the downstream side in the longitudinal direction of the barrel 16 .
As described above, how to narrow the cross section of the flow path in the pressing portion 32 may be determined from the viewpoint of adjusting the pressing force, including the radial direction. In addition, as shown in FIG. 7, the conveying screw element 20A is not limited to two full-flighted screws, but may be one or three full-flighted screws as long as it is suitable for the narrowing of the cross section of the flow passage in the pressing section 32. It's okay.
As a modification, the outer peripheral closed curve portion 40 may be circular, and the rotation axis of the corresponding rotary shaft 18 may be eccentric to the center of the arc portion 14 .
The barrel 16 of the screw element 20B for compression is adjusted so that the cross-sectional area SA of the oil-containing solid material M formed between the outer surface 34 of the screw element 20B for compression and the inner surface 36 of the barrel 16 is a predetermined area. An outer peripheral edge shape of a cross section perpendicular to the longitudinal direction X is set.
Depending on the flow rate of the oil-containing solid material M in the barrel 16, the degree of compression of the oil-containing solid material M in the oil extraction section is adjusted according to how small the cross-sectional area of the flow path is set.

The axial length L of the squeezing screw element 20B, the side peripheral surface 34B of the squeezing screw element 20B facing the inner surface 36 of the barrel 16, and the oil-containing solid material M is shaped so that a predetermined time can be secured for the compression time from the oil-containing solid material conveying direction upstream end 44 of the compressing screw element 20B to the oil-containing solid material conveying direction downstream end 46. For example, at a given number of rotations of the rotary shaft 18, the longer the axial length L, the longer it takes for the oil-containing solid material M to pass through the squeezing screw element 20B, and the longer the squeezing time is set. be done.
The number of threads of the screw element 20, the tip angle of the predetermined tip 50, the amount of eccentricity, and the predetermined interval D are selected according to the type, bulk specific gravity, or viscosity of the oil-containing solid material M.
The predetermined distance D is, for example, 0.2 mm or less, and is set so that overheating due to shearing of the oil-containing solid material M does not occur or self-cleaning of the compressing screw element 20B is possible. be done.
Alternatively, different types of screw elements 20 may be aligned in the longitudinal direction X of the barrel 16, differing in either the number of threads or the amount of eccentricity in the squeezing screw elements 20B.
For example, among the plurality of oil extraction sections 24, the number of threads of the compression screw element 20B may be increased in the oil extraction section 24 positioned downstream in the longitudinal direction X of the barrel 16, whereby the degree of compression is increased in the downstream direction. can be increased, and the number of threads may be changed for each disc 52 .

A plurality of (three in the drawing) oil extraction units 24 are provided in series in the longitudinal direction X of the barrel 16, and each oil extraction unit 24 extracts the oil O extracted from the oil O-containing solid matter to each oil recovery unit 26. , and can be selected according to the amount of oil-containing solid material M supplied by the supply unit 22 per hour.
For example, when the amount of oil-containing solid material M supplied from the supply unit 22 per hour is small, only the most upstream side of the plurality of oil extraction units 24 is used, and the screw 62 of the oil recovery unit 26 on the downstream side is used. can be stopped.
As a result, the oil-containing solid material M, which has been oil-extracted by the oil-extracting section 24 on the upstream side, is extracted again by the oil-extracting section 24 on the downstream side, thereby ensuring an oil recovery yield.
As a modification, in order to return the oil O-containing solids extracted in the barrel 16 to the oil O-containing solids supply side of the barrel 16 and circulate so as to be squeezed again, A return channel may be provided to communicate with the upstream portion. Furthermore, while providing the some oil extraction part 24, you may provide a return flow path.

The oil recovery section 26 has an oil outflow opening 38 near the compression screw element 20B of the barrel 16 so that only the extracted oil O accumulated in the lower portion of the barrel 16 can be recovered.
More specifically, the oil outflow opening 38 extends from the bottom of the barrel 16 to the upper level so that the extracted oil O accumulated in the lower portion of the barrel 16 can be collected, and the screw element 20B for squeezing the oil squeezing section 24 A pair is preferably provided in front and behind the axial length.
In particular, the oil recovery section 26 is preferably connected to the conveying section 30 adjacent to the longitudinal upstream side and the downstream side of the pressing section 32 .

The oil recovery part 26 is supported by a stand 29 at its end, is connected in communication with the oil outflow opening 38 , and has a casing 60 having an oil recovery opening 59 . A screw 62 rotating in the forward direction is provided, and the extracted oil O is recovered through the oil recovery opening 59, while the extracted oil-containing solid material M is not recovered. As a result, the oil-containing solid material M extracted by the upstream oil extractor 24 can be extracted again by the downstream oil extractor 24 while recovering the extracted oil.

As shown in FIG. 9, the extrusion section 33 provided at the most downstream portion in the longitudinal direction of the barrel includes a conventionally known die adapter 70 for discharging the molten resin raw material as a string-shaped strand 88, a die head 72, and a die plate 77. and a die holder 74 holding a die 76 are provided. A plurality of outflow holes are formed in the die plate 77, for example, side by side, and a string-like strand 88 is generated by discharging molten resin from each outflow hole.

The die assembly 75 consists of an inflow part into which the resin, which is a solid material that has been extracted, flows in, and an outflow part from which the molten resin flows out to the die plate 77. A pressure gauge (not shown) installed in the inflow part measures the pressure is exposed to the flow path, the pressure of the molten resin is detected, and a thermometer (not shown) installed at the outflow part is exposed to the flow path, Detect the temperature of the molten resin.
The extruding part 33 is provided with a melting part 80 that heats the resin raw material to a melting temperature so that it can be extruded from the die plate 77 in the form of strands 88 . The melting section 80 may be a heater 78 arranged inside the die assembly 75 so as to surround the inflow section and the outflow section, similar to the heating section 28 that heats the oil-containing solid material M to a softened state. The inner peripheral surface of the die assembly 75 constitutes a heat transfer surface to melt the resin raw material inside. It is preferable to adjust the heating capacity of the heater according to the type of resin raw material or the amount of resin raw material supplied per hour so that the resin raw material reaches the die assembly 75 in a melted state in which it can be extruded. .

The strand cutter 86 is installed ahead of the strand 88 extruded from the die 76 in the extruding direction, and is of a conventionally known type, and may be a cutter composed of a rotary blade (not shown) and a fixed blade (not shown). , the rotary blade is configured as a drum-shaped cutter rotatable around a horizontal rotary blade rotation axis, and a plurality of rotary blade cutting edges are provided at regular intervals in the circumferential direction of the drum, while the fixed blade is pushed out. guide strand 88; As a result, the cutting edge of the rotating blade hits the strand from directly above the strand 88 extruded from the die 76 to the outside, so that the strand 88 is sandwiched between the cutting edge of the rotating blade and the fixed blade and sheared, and the strand 88 is cut. to form pellets 90 . The cut pellets 90 are discharged, for example, into a product box (not shown) and reused as molding material for new products. The number of rotations of the rotary blade rotating shaft may be adjusted in accordance with the desired size of the pellets 90 and in relation to the extrusion speed of the strands 88 . Before the strand cutter 86 cuts the strand, it is preferable to cool the strand by air cooling or water cooling so that the strand can be easily cut.

The operation of the oil-extracting/pelletizing apparatus 10 having the above configuration, including the oil-extracting/pelletizing method, will be described below with reference to FIG.
First, the heating unit 28 heats the oil-containing solid material M to the lower temperature of the melting point of the solid material or the allowable heating temperature of the oil O, depending on the type of the oil-containing solid material M to be extracted. The heating temperature is set such that the melting unit 80 heats the solid material after oil extraction to a molten state.
Next, the amount of material supplied per hour by the feeder in the supply section 22 and the amount of the oil-containing solid material M conveyed per hour by the rotation of the screw element 20 in the conveying section are set.
Thus, by adjusting the forward transport speed of the oil-containing solid material, the filling degree of the oil-containing solid material M in the sealed space inside the barrel 16 is adjusted.
In particular, depending on the type and aspect of the oil-containing solid material M and the type of the screw element 20, the optimum rotation speed (explained below) that maximizes the oil recovery yield is set.

As described above, preparation for continuously conveying the oil-containing solid material M is completed by the rotation of the screw element 20 which is arranged in the barrel 16 and fitted on the rotating shaft 18 which is rotatable about the axis of the rotating shaft 18. .
Next, while the inner surface of the barrel 16 is kept at a predetermined temperature and the rotary shaft 18 is rotated by the feeder and drive motor 19, the oil-containing solid material M is continuously supplied.
The supplied oil-containing solid material M is transported downstream in the longitudinal direction of the barrel 16, during which time the oil-containing solid material M is lowered to the melting point of the solid material or the allowable heating temperature of the oil O, whichever is lower. is heated.
Next, the heated and softened oil-containing solid material M is squeezed including radial directions while being continuously transported downstream in the longitudinal direction in each oil extraction section 24, thereby extracting oil as follows. be.

More specifically, in the oil extraction stage, the cross-sectional area of the flow path narrows over a predetermined length in the closed space while continuously conveying the oil-containing solid material M toward the downstream side in the extending direction in the closed space. The oil is extracted from the oil-containing solid material M by passing through the cut portion and pressing the oil-containing solid material M under a predetermined pressing force for a predetermined pressing time.
At this time, by forming a pressure barrier on the downstream side of the sealed space by narrowing the flow passage cross-sectional area, the degree of filling of the sealed space with the heated oil-containing solid material M on the upstream side of the pressure barrier is increased. At the same time, the oil-containing solid material M is squeezed, the oil is extracted, and the extracted oil is continuously recovered.
The extracted oil is collected on the spot through each oil collection part 26 to the side with respect to the extending direction of the sealed space.

On the other hand, the oil-extracted solid material is extruded from the die 76 as a strand 88 to the outside. is formed. The cut pellets 90 are discharged, for example, into a product box (not shown) and reused as molding material for new products.
Residual solid matter adhering to the outer surface of the screw element 20 may be removed as appropriate after the oil extraction operation is completed.
Regarding the oil extraction yield, the optimum number of rotations exists under the condition that the amount of material supplied into the barrel 16 per hour is constant. Compressing force with the flow passage cross section between the outer surface of the barrel 16 and the inner surface of the barrel 16 as the dominant factor, and the material conveying speed from the upstream side end face to the downstream side end face of the screw element 20 with the dominant factor until the material passes It is determined by the product with the pressing time.
In this regard, increasing the rotation speed of the screw element 20 increases the pressing force but decreases the pressing time, and decreasing the rotation speed decreases the pressing force but increases the pressing time.
Therefore, the degree of compression determined by the product of the compression force and the compression time has an optimum number of revolutions that maximizes the degree of compression.

According to the oil extraction and pelletization apparatus 10 having the above configuration, the oil-containing solid material M supplied from the supply unit 22 into the barrel 16 is moved to the downstream side in the longitudinal direction of the barrel 16 by the rotation of the rotary shaft 18, that is, the screw element. , the oil-containing solid material M is heated by the heating unit 28 so that the oil-containing solid material M is softened to the lower temperature of the melting point of the solid material or the allowable heating temperature of the oil, and is compressed by the compressing screw element 20. As a result, only the extracted oil accumulated in the lower part of the barrel is recovered by the oil recovery part 26 via the oil outflow opening 38, while the solid material after oil extraction is recovered. is melted by the melting section 80 near the extrusion section in the extrusion section 33 on the downstream side of the oil extraction section 24, extruded to the outside in the form of strands 88, and cut into pellet products. Through separation from the solid material from which the oil is recovered, the oil-containing solid material M is continuously conveyed and oil-extracted, and the solid material after oil extraction can be made into pellet products on the spot for reuse.
In addition, according to the oil extraction and pelletization device 10 having the above configuration, the inner space of the barrel 16 is completely filled in the longitudinal direction so as not to generate excessive torque for the motor that rotationally drives the rotating shaft 18. So, while avoiding conveying the oil-containing solid material M in a softened state by heating, the barrel 16 is provided so that the oil-containing solid material M can be continuously conveyed in the longitudinal direction and compressed including in the radial direction. Even if the space between the inner surface and the screw element 20 is narrowed, the oil itself of the liquid extracted from the oil-containing solid material M is not conveyed in the longitudinal direction of the barrel 16 by the rotation of the screw element 20, and the oil is extracted. An oil recovery part 26 is provided in front of the barrel 16 of the oil extraction part 24 in the longitudinal direction, preferably in front and rear respectively, where oil is accumulated in the lower part of the internal space of the barrel 16 of the part 24, and the sealed space in the barrel 16 is provided. It is possible to efficiently recover the oil that accumulates in the

More specifically, according to the oil extracting and pelletizing apparatus 10 described above, the rotating shafts 18 rotate about their axes, so that the pair of screw elements 20 fitted on the respective rotating shafts 18 rotate in the same direction. The oil-containing solid material M introduced into the barrel 16 is conveyed downstream in the longitudinal direction X of the barrel 16 by rotating.
At that time, the cross-sectional area SA of the oil-containing solid material M formed between the outer surface 34 of the screw element 20B for squeezing and the inner surface 36 of the barrel 16 is equal to the outer surface 34A of the screw element 20A for conveying and the barrel 16 Since the oil-containing solid material M is set to be smaller than the flow channel cross-sectional area SA of the oil-containing solid material M configured between the inner surface 36 of As a result, the oil-containing solid material M moves from the conveying direction upstream end 44 of the oil-containing solid material M of the squeezing screw element 20B to the conveying direction downstream end 46 of the oil-containing solid material M within the flow passage cross-sectional area SA. The oil content O that has been compressed, including in the radial direction, until it passes through is accumulated at the bottom of the barrel 16 on the spot. The solid matter thus formed is conveyed downstream in the longitudinal direction X within the barrel 16 .
As described above, the oil-containing solid material M is compressed, including in the radial direction, for a predetermined compression time under a predetermined compression force due to the narrowing of the flow path cross-sectional area SA in the oil extraction unit 24. Only the oil content O accumulated on the spot is recovered by the oil recovery section 26 through the oil outflow opening 38 .

On the other hand, according to the pressing method of the present embodiment, while continuously transporting the oil-containing solid material M in the closed space in the forward direction along the extension direction of the closed space, the melting point of the solid material or the allowable heating temperature of the oil By heating the oil-containing solid material M to the lower temperature or lower, the oil-containing solid material M is softened so that it can be extracted, and a pressure barrier is formed on the downstream side of the sealed space, thereby heating the sealed space on the upstream side of the pressure barrier. By increasing the degree of filling of the oil-containing solid material M, the oil-containing solid material M is squeezed including in the radial direction, and the oil is squeezed out. It is possible to continuously recover the extracted oil by putting it in and pressing it statically, unlike batchwise oil extraction.
In addition, dynamic compression is not caused by utilizing the shearing of the object that occurs at the meshing portions of the corresponding compressing screw elements 20B of each rotating shaft 18, and the oil-containing solid material M is heated by such shearing. This prevents thermal deterioration of the extracted oil, and the oil-containing solid material M remains attached to the outer surface of the compressing screw element 20B, thermally deteriorated, and the thermally deteriorated solid material is extracted. It is also possible to eliminate the possibility of contamination of the oil that has been produced.

A second embodiment of the present invention will be described below. In the following description, components similar to those of the first embodiment are given the same reference numerals, and the description thereof is omitted. to explain.
A feature of the second embodiment of the present invention is the squeezing screw element 20B provided in each squeezing section.

In the first embodiment, regarding the screw element 20B that serves both for conveying and squeezing the oil-containing solid material M in the axial direction of the barrel 16, a plurality of thin plate-like elements are provided so that the positions (cusps) of the tips 50 are not aligned in the circumferential direction. Although it has been described as a type in which the oil-containing solid materials M are stacked in the axial direction while being continuously displaced, the rotation of the screw enables the oil-containing solid material M to be transported in the axial direction of the barrel 16, A monolithic screw rather than a plurality of stacked laminations, as long as a constriction of the flow area of the oil-containing solid material M is formed in the axial direction, thereby squeezing is possible, and the outer surface The lead 30 may be formed in 34B so that the positions of the chips 50 in the circumferential direction are continuously connected in the longitudinal direction.
More specifically, as shown in FIG. 10, the squeezing screw element 20B is four-threaded, monolithic with circular openings 48 in which the rotating shafts 18 are fitted, and has opposite end faces 44 spaced apart in the longitudinal direction X. , 46 have two or more (four) chips 50 in the circumferential direction, and spiral leads 56 connected to the chips 50 on both end faces 44 and 46 are provided on the circumferential side surfaces, and are continuous in the longitudinal direction X. and the center of the circular opening 48 is offset with respect to the center of the barrel 16 .
By adjusting the pitch of the spiral lead 56, it is possible to adjust the conveying speed of the oil-containing solid material M by the squeezing screw element 20B, that is, the time for squeezing the oil-containing solid material M.
When a plurality of oil extraction units 24 are provided, one oil extraction unit 24 includes the discontinuous type compression screw element 20B in the first embodiment, and one oil extraction unit 24 includes the continuous type compression screw element 20B in the present embodiment. A screw element 20B may be employed.
Regarding the oil-extracted solid material, the strand 88 extruded from the die 76 is cut by the strand die cutter 86 to be reusable as pellets 90, which is the same as in the first embodiment.

A third embodiment of the present invention will be described below. In the following description, constituent elements similar to those of the first embodiment are given the same reference numerals, and the description thereof is omitted. to explain.
The feature of the third embodiment of the present invention resides in the aspect of the melting section that heats the solid material after oil extraction to a molten state provided near the extrusion section 33. In the first embodiment, the extrusion section 33 at the most downstream section The heating coil 78 provided in the heating coil 78 heats the solid material after oil extraction to a molten state. It is in the point to do.
More specifically, as shown in FIG. 11, in the first embodiment, the normal conveying screw element 20A is arranged in the zone C11 (see FIG. 2), but in the present embodiment, the oil extraction A screw element 20C of the same kind as the screw element 20B for squeezing provided in each of the zones C4, C7 and C9 is arranged, and the rotation of the screw element 20C shear-heats and melts the pressed solid material passing through the zone C11. I have to.

The pressed solid material melted in zone C11 is melted in extruding part 33 and extruded in a strand shape, and in zone C12 and zone C13, it is kept warm by heating part 28. there is In the first embodiment, the heating heater 78 as the melting portion 80 provided in the extruding portion 33 is also preferably not for melting, but for a heat insulating function so that the molten solid material can be maintained in a molten state.
In the extruding section 33, the inside of the die 76 must be in a completely melted state so that the melted solid material can be discharged uniformly. screw elements, while C13 requires a full-flight screw to keep the outlet (die 76) pressure constant (filled with molten fixing material), both especially with narrow flights. That is, it is preferable to adopt a full-flight screw with a small lead.

The screw element 20C is required to have a shear heating function instead of a compressing function. Article 5 is also acceptable.
Regarding the oil-extracted solid material, the strand 88 extruded from the die 76 is cut by the strand die cutter 86 to be reusable as pellets 90, which is the same as in the first embodiment.

Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and changes without departing from the scope of the present invention.
For example, in the present embodiment, the cross-sectional area of the oil-containing solid material formed between the outer surface of the screw element for compression and the inner surface of the barrel in the pressing section is the cross-sectional area of the outer surface of the screw element for conveying and the barrel. Although the case where it is set to be smaller than the flow passage cross-sectional area of the oil-containing solid material configured between the inner surface and the inner surface has been described, the oil-containing solid material Oil may be extracted by applying back pressure to the material, and the solid material after oil extraction may be extruded into strands and pelletized.
For example, in the present embodiment, it was explained that the screw element 20 is selected according to the type and mode of the oil-containing solid material M in the pressing section. The squeezing time in the squeezing part can be adjusted by adjusting the shape of the outer peripheral surface and the length in the longitudinal direction. or by adjusting both the squeezing time and the squeezing force in the squeezing section, depending on the screw element 20 selected in this way and the type and aspect of the oil-containing solid material M, the optimum rotary shaft After setting the number of revolutions to 18, the oil extraction effect can be optimized.

For example, in the present embodiment, the screw elements 20 are selected according to the type and aspect of the oil-containing solid material M in the pressing section, more specifically, the outer peripheral shape including the number of threads of the screw elements 20, It has been explained that the squeezing force in the squeezing part is adjusted by increasing or decreasing the flow passage cross-sectional area, or both the squeezing time and the squeezing force in the squeezing part are adjusted. A flow formed between the inner surface 36 of the barrel 16 and the outer peripheral surface 34 of the squeezing screw element 20B when the oil-containing solid material M conveyed in the squeezing screw element 20B in a non-filled state passes through the squeezing screw element 20B. The flow path defined between the inner surface 36 of the barrel 16 and the outer peripheral surface of the squeezing screw element 20B is such that the desired degree of compression is achieved by increasing the degree of fullness of the oil-bearing solid material M in the passage. A volume may be determined.

For example, in the present embodiment, a plurality of oil recovery units 16 extending laterally are provided at predetermined intervals in the longitudinal direction of the barrel 16, and the oil O extracted from the oil-containing solid material M is collected in each of the oil recovery units 16. Although it has been described that both recovery efficiency and recovery yield per hour are enhanced by recovering from the barrel 16 By increasing the L/D of the oil-containing solid material M, the number of screw elements 20 for conveying and squeezing the oil-containing solid material M is increased, and a single oil-containing material A recovery unit 16 may be provided. In this case, the L/D of the barrel 16 is increased to avoid excessive torque.

For example, in the present embodiment, a plurality of oil recovery units 16 extending laterally are provided at predetermined intervals in the longitudinal direction of the barrel 16, and the oil O extracted from the oil-containing solid material M is collected in each of the oil recovery units 16. However, without being limited to this, if the recovery efficiency per hour is emphasized rather than the recovery yield, the end of the barrel 16 opposite to the oil-containing solid material M supply side is simply While one oil recovery unit 16 is provided, the extracted oil-containing solid material M may be returned to the supply side of the oil-containing solid material M of the barrel 16 and circulated so as to be compressed again. In order to prevent the temperature of the oil-containing solid material M from dropping, a temperature holding section may be provided in the flow path forming the return section. In this case, since it is not necessary to increase the L/D of the barrel 16, the lengthening of the compression device is suppressed and the risk of excessive torque is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic whole perspective sectional view of the oil extraction and pelletization apparatus 10 which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic partial sectional view of the oil extraction and pelletization apparatus 10 which concerns on 1st Embodiment of this invention. Fig. 2 is a schematic cross-sectional view along A-A in Fig. 1 of the side recovery section 16 of the oil extraction and pelletization device 10 according to the first embodiment of the present invention; It is a schematic sectional view of the oil extraction part 24 of the oil extraction and pelletization apparatus 10 which concerns on 1st Embodiment of this invention. FIG. 4A is a side view, an end view, and a perspective view of a screw element 20B of the oil extraction unit 24 of the oil extraction and pelletization device 10 according to the first embodiment of the present invention. Between the inner surface of the barrel 16 and the screw element 20 (6 (A) to 6 (C)) according to the rotation of the screw element 20B of the oil extraction unit 24 of the oil extraction and pelletization device 10 according to the first embodiment of the present invention 4 is a schematic cross-sectional view showing a change in flow channel cross section SA formed in . It is the same figure as FIG. 6 of screw element 20A of the conveyance part 30 of the oil extraction and pelletization apparatus 10 which concerns on 1st Embodiment of this invention. FIG. 8 is a view similar to FIG. 7 of four-thread discs in the middle portion of the screw element 20B of FIG. 5 according to the first embodiment of the present invention; Fig. 3 is a partial cross-sectional view around an extruder 33 of the oil extracting and pelletizing device 10 according to the first embodiment of the present invention; Fig. 10 is a perspective view of a screw element 20B of the oil extracting and pelletizing device 10 according to the second embodiment of the present invention; FIG. 3 is a view similar to FIG. 2 of an oil extraction and pelletization device 10 according to a third embodiment of the present invention;

X Longitudinal direction D Predetermined interval M Oil-containing solid material O Oil content SA Cross-sectional area of flow path L Length of screw element in axial direction
d Predetermined clearance
t Disk thickness 10 Oil and pelletizing device 12 Cylinder 13 Cylindrical cylinder 14 Arc portion 16 Barrel 17 Internal space 18 Rotating shaft 19 Drive motor 20 Screw element 20A Conveying screw element 20B Compressing screw element 20C Melting screw element 21 Rotation transmission Mechanism 22 Feeding section 23 Hopper 24 Oil extraction section 25 Support stand 26 Oil recovery section 27 Drive motor 28 Heating section 29 Support stand 30 Transfer section 31 Rotation transmission mechanism 32 Compression section 33 Extrusion section 34A Outer surface 34B of conveying screw element 20A For compression Outer surface 36 of screw element 20B Inner surface 38 Oil outflow opening 40 Outer peripheral closed curve portion 41 Overhanging flange 42 Partial region 43 Screw hole 44 Oil-containing solid material M conveying direction upstream end 46 Oil-containing solid material M conveying direction downstream end 48 Circular opening 50 Tip 52 Disk 56 Spiral lead 58 Return channel 60 Casing 61 Shaft 62 Screw 63 Oil recovery opening 70 Die adapter 72 Die head 74 Die holder 75 Die assembly 76 Die 77 Die plate 78 Heater 80 Melting part 82 Space 84 Outflow Part 86 Strand cutter 88 Strand 90 Pellets

Claims (11)

a rotatable shaft extending longitudinally within the barrel;
a screw element fitted onto the rotating shaft;
A supply unit that supplies the oil-containing solid material into the barrel, an oil extraction unit that extracts oil from the oil-containing solid material supplied by the supply unit, an oil recovery unit that recovers the extracted oil, and the oil extraction unit. A heating unit that heats the oil-containing solid material to a softened state below the lower temperature of the melting point of the solid material or the allowable heating temperature of the oil before being compressed by
In the pressing section, the screw element is a pressing screw element capable of pressing an oil-containing solid material,
The oil recovery part is provided laterally with respect to the longitudinal direction of the barrel so as to recover only the extracted oil that accumulates in the lower part of the barrel. An outflow opening for oil is provided in the vicinity,
Furthermore, an extrusion unit for extruding the solid material after oil extraction is provided downstream of the oil extraction unit,
In the vicinity of the extruding part, a melting part for heating the solid material after oil extraction to a molten state is provided,
Cutting the solid material extruded to the outside in a strand by the extruding unit to obtain a pellet product;
An oil extracting and pelletizing device characterized by: The barrel connects two cylindrical cylinders in parallel in the longitudinal direction, and has a cocoon shape in which a pair of circular arc portions are continuous in a cross section perpendicular to the longitudinal direction,
each of the rotating shafts extends longitudinally within a corresponding cylindrical cylinder concentrically therewith;
Two rotating shafts spaced apart from each other by a predetermined distance and rotatable in the same direction about the longitudinal direction,
each of the screw elements forms a pair that is fitted onto each of the two rotating shafts;
The pair of screw elements are identical to each other, are provided at the same position in the longitudinal direction of the barrel, and are arranged to mesh with each other at a predetermined interval between the two rotating shafts.
The oil extractor and pelletizer according to claim 1. The oil squeezing unit has a conveying unit and a squeezing unit that are arranged adjacent to each other in the longitudinal direction,
In the conveying portion, the pair of screw elements are conveying screw elements capable of conveying the oil-containing solid material to the downstream side in the longitudinal direction of the barrel,
The cross-sectional area of the oil-containing solid material configured between the outer surface of the screw element for compression and the inner surface of the barrel is configured between the outer surface of the screw element for conveying and the inner surface of the barrel. is set smaller than the cross-sectional area of the oil-containing solid material
The oil extraction and pelletization device according to claim 2. The squeezing screw element has a circular opening into which the rotating shaft fits and is longitudinally stacked in discs having two or more tips in the circumferential direction, the corresponding tips of longitudinally adjacent discs being circumferentially spaced. 4. The oil extractor and pelletizer of claim 3, which is of the longitudinally discontinuous type, which is displaced in direction, wherein the center of said circular opening is offset with respect to the center of said barrel. The squeezing screw element has a monolithic shape with a circular opening into which the rotating shaft is fitted, and has two or more tips in the circumferential direction on each of its longitudinally spaced end faces. 4. The oil extractor and pelletizer of claim 3, which is of the longitudinally continuous type provided with helical reeds leading to the tip of the face and is offset of the center of said circular opening with respect to the center of said barrel. . The said oil extraction part is provided in series with the longitudinal direction of the said barrel, and the said extrusion part is given in any one of Claim 1 thru|or 5 provided downstream of the said oil extraction part of the most downstream side. oil press and pelletizer. The oil recovery unit is provided with a casing connected to the oil outflow opening and having the oil recovery opening, and a screw provided in the casing and rotating in a direction toward the oil outflow opening, 2. The oil extraction and pelletization device according to claim 1, wherein the extracted oil is recovered through the oil recovery opening, and the extracted oil-containing solid material is not recovered. The oil extracting and pelletizing device according to any one of claims 1 to 7, wherein the oil-containing solid material is a thermoplastic resin. While continuously transporting the oil-containing solid material impregnated with oil in the closed space in the forward direction along the extension direction of the closed space, the melting point of the solid material or the allowable heating temperature of the oil, whichever is lower heating the oil-containing solid material to a temperature below the temperature so that the oil-containing solid material is in a softened state;
By forming a pressure barrier on the downstream side of the sealed space, the oil-containing solid material is compressed while increasing the filling degree of the heated oil-containing solid material in the sealed space on the upstream side of the pressure barrier, and the oil is removed only by squeezing. extracting oil;
While continuously recovering the extracted oil, the solid material after oil extraction is melted and extruded to the outside in a strand shape;
cutting and pelletizing the extruded solid material;
A method for extracting oil and pelletizing, characterized by comprising: 10. The oil extracting and pelletizing method according to claim 9, wherein said pelletizing step comprises air-cooling or water-cooling the extruded solid material so that it can be cut into predetermined lengths in the longitudinal direction before cutting. 11. The oil extraction and pelletization method according to claim 9 or 10, wherein the oil-containing solid material is a thermoplastic resin.

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