JP2004231755A - Method for producing highly packed filler compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a highly packed filler compound, with which even the filler is sufficiently heated and production efficiency is improved by continuous production. <P>SOLUTION: When a melted mixture D1 is formed by heating, melting and mixing a raw material mixture C1 composed of a powdery material A1 and a resin material B1 in a mixture conveying unit 34, shearing heat is caused in the raw material mixture C1 by shearing force applied to the raw material mixture C1 by the rotation of a kneading blade 35b besides heating by a heating and melting apparatus. Consequently, the nonmelted resin material B1 remaining in the raw material mixture C1 is melted so that the formed melted mixture D1 is discharged to produce the filler compound E1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a highly filled filler compound in which a mixture of a filler and a resin material is heated and melt-kneaded.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a filler compound has been manufactured by heat-melting and kneading a mixture of a fine-grained filler and a resin material using a heat-melting apparatus. There is also known a method in which a filler and a resin material are stirred at a high speed in a mixing tank with a high-speed stirring blade (super mixer), and the mixture is heated using frictional heat generated when the fillers collide with each other. As a conventional technique for heating a mixture using a mixing tank with a high-speed stirring blade, one disclosed in Patent Document 1 is known.
[0003]
[Patent Document 1]
JP-A-2000-290466 (paragraphs 0026-0042)
[0004]
[Problems to be solved by the invention]
However, heating using a heating / melting device or frictional heat generated at the time of collision between fillers cannot sufficiently heat the fillers, so that a sufficient amount of heat may not be provided to the filler compound in a short time.
[0005]
For this reason, continuous production was difficult, and it was sometimes difficult to improve production efficiency.
[0006]
The present invention has been made in view of the above problems, and can sufficiently heat a filler in a mixture to give a sufficient amount of heat to a filler compound in a short time, thereby facilitating continuous production. An object of the present invention is to provide a method for producing a highly filled filler compound capable of improving efficiency.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a method for producing a highly-filled filler compound in which a mixture of a fine-grained filler and a resin material is melted and kneaded by heating to a predetermined temperature. Heating is performed by heating with a heating and melting device and shear heat insulation generated by generating a shearing force in the mixture by a kneading device provided for performing melt-kneading.
That is, the mixture composed of the fine-grained filler and the resin material is heated by a heating and melting device, and a shearing heat generated by generating a shearing force on the mixture by a kneading device arranged to perform melt-kneading. Is also heated. Since the mixture is heated by both, the unmelted resin material remaining in the mixture is quickly melted. As a result, the filler and the resin material can be quickly melt-kneaded to produce a filler compound.
Thereby, sufficient heat can be given to the filler compound in a short time by sufficiently heating the filler, and continuous production of the filler compound can be facilitated to improve the production efficiency.
Various shapes of the finely divided filler are conceivable, and even a powdery or fine fibrous shape is included in the finely divided shape according to the present invention. In addition, by adjusting the particle size of the filler, the strength of the molded article formed from the filler compound can be adjusted.
[0008]
Here, the kneading device has a space forming member that forms a kneading space for kneading the mixture on the inner wall surface, and kneading blades disposed in the kneading space, and the kneading blade is driven by rotation. It is good also as composition provided so that a shearing force may be given to the above-mentioned mixture between an outer peripheral end and the inner wall surface of the same space formation member at the time of doing.
That is, when the kneading blade is driven to rotate, the mixture is pressurized, so that the shearing of the mixture between the outer peripheral end of the kneading blade and the inner wall surface of the space forming member forming the kneading space for mixing the mixture is performed. Forces arise. As the kneading blade continues to rotate, shearing force is applied to the mixture many times. The shear heat is generated in the mixture by the repeated application of the shearing force. Since the shear force is continuously applied to the mixture while the driving of the kneading blade is continued, the shear heat generated in the mixture increases. When the generated shear insulation accumulates and the mixture reaches a predetermined temperature, the unmelted resin material remaining in the mixture is melted and uniformly dispersed throughout the mixture. Therefore, when the manufactured filler compound is molded, cooled, and solidified, it is possible to form a high-strength molded product. It is to be noted that the molded article may have various shapes, and may be, for example, a pellet or a molded article such as a building material.
[0009]
Further, the kneading wing is formed in a substantially spiral shape, and is provided so as to generate shear heat insulation capable of melting the resin material by providing a predetermined clearance between an outer peripheral end and an inner wall surface of the space forming member. Configuration.
In the kneading apparatus used here, the clearance between the outer peripheral end of the kneading blade and the inner wall surface of the space forming member is a predetermined clearance. When the kneading blades are driven to rotate, the mixture is pressurized, so that the mixture is pushed between the outer peripheral end of the kneading blades having a predetermined clearance and the inner wall surface of the space forming member, and a shearing force is applied to the mixture to give the mixture. Shear insulation is created. Since the shearing force is continuously applied to the mixture while the rotation of the kneading blade is continued, the shear heat generated in the mixture increases. In this way, the heat-melted resin material is uniformly dispersed throughout the mixture.
Needless to say, the kneading device only needs to be able to generate shearing heat in the mixture to generate shear insulation. Therefore, in addition to the above-described device having the kneading blades, the kneading device according to the present invention includes a stirring device, a mixing device, and the like having an action of generating shear heat by the rotating stirring blades.
[0010]
Incidentally, a configuration may be adopted in which the resin material is infiltrated into the entire mixture by applying a predetermined pressure to the mixture. When a predetermined pressure is applied to the mixture, the filler and the resin material in the mixture are compressed, and the distance between the filler and the resin material is reduced, whereby the filler and the resin material are more bound and adapted, and the resin material infiltrates the entire mixture. . Then, a more uniform and high quality filler compound can be manufactured.
[0011]
【The invention's effect】
As described above, the present invention can provide a filler compound with a sufficient amount of heat in a short time by sufficiently heating the filler in the mixture, thereby facilitating continuous production of the filler compound and improving production efficiency. It is possible to provide a method for producing a highly filled filler compound capable of being used.
According to the invention according to claims 2 to 4, it is possible to provide a specific example in which a shear force is reliably applied to the mixture to generate shear heat insulation. As a result, a uniform and high-quality filler compound in which the filler and the resin material are uniformly mixed can be manufactured, and a high-strength molded product can be formed.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in the following order.
(1) Outline of filler compound manufacturing method:
(2) Details of the filler compound production method:
(3) Function of filler compound manufacturing method:
(4) Second embodiment:
[0013]
(1) Outline of filler compound manufacturing method:
FIG. 1 is a schematic flow chart showing a method of manufacturing a highly filled filler compound according to a first embodiment of the present invention for each step.
The filler compound E1 is an intermediate product in a state where a finely divided filler (filler) and a predetermined resin material for binding the filler into a lump are melted by heating. When this filler compound E1 is molded into a predetermined shape, a molded product such as wood plastic or a building material is formed. That is, the filler compound E1 is an intermediate product for producing various molded articles such as building materials and various pellets used as aggregates.
[0014]
When manufacturing the filler compound, first, the finely divided filler A1 and the resin material B1 are charged into the filler compound manufacturing apparatus 30 (step S10). Although the resin material B1 of the present embodiment uses a granular material, any shape may be used as long as it can be mixed with the filler A1. Next, the filler A1 and the resin material B1 are mixed to generate a raw material mixture C1 before heat-melting and kneading, and the raw material mixture C1 is heated and melt-kneaded to change into a molten mixture D1 (step S11). Then, when the molten mixture D1 is discharged while applying pressure (step S12), the filler compound E1 is manufactured.
[0015]
In addition, the name of the mixture composed of the filler A1 and the resin material B1 constituting the raw material of the filler compound E1 is changed for convenience according to the progress of the manufacturing process. That is, the mixture before the heat melting and kneading is referred to as a raw material mixture C1, the mixture during the heat melting and kneading is referred to as a molten mixture D1, and the irregularly shaped material after the heat melting and kneading is referred to as a filler compound E1.
[0016]
Various materials can be adopted as the filler A1, and for example, a wood-based material or a mineral-based material may be used. Here, as the wood-based material, various materials such as wood flour, wood wool, wood chips, wood fiber, wood pulp, wood fiber bundle, etc. can be adopted, and bamboo fiber, hemp fiber, bacas, fir, rice straw and the like are available. Materials such as cellulose as a main component may be mixed. Wood is commonly used in every scene, such as furniture factories and construction sites. If wood chips are generated in these scenes, such chips can be collected and used as a wood-based material. In addition, a large amount of waste material is generated after the wood body is used as a raw material for furniture, building materials, and the like, and such waste material may be crushed. Further, when furniture and building materials are discarded, the waste may be crushed. According to such a configuration, the cost of the wood-based molded body is extremely low, and it can greatly contribute to the reduction of dust and can promote the recycling of waste.
In the present embodiment, finely divided wood powder 10 (including powder and fine fiber) is used as the filler A1.
Various particle diameters can be adopted as the particle size of the wood flour 10 as long as the wood flour 10 can be bonded to each other by the resin material. In addition, by adjusting the particle size of the wood flour, the strength of the molded article formed from the filler compound can be adjusted.
[0017]
Various resins can be used as the resin material B1, and examples thereof include thermoplastic resins such as polypropylene, polyethylene, polystyrene, polymethyl methacrylate, vinyl chloride, nylon, polycarbonate, polyacetal, polybutylene terephthalate, and polyethylene terephthalate. Can be used. Of course, a thermosetting resin such as a phenol resin, a urea resin, a melamine resin, an unsaturated polyester resin, and an epoxy resin can also be used. These resins may be used in combination.
In the present embodiment, a polyolefin resin material 20, which is a kind of thermoplastic resin, is used. The resin material 20 is specifically a substance made of a polymer of an alkene such as polyethylene or polypropylene, and is formed into particles having a predetermined diameter so as to be easily mixed with the wood powder 10 described above. As with the wood flour 10, the polyolefin-based resin material 20 can use unnecessary industrial waste. Further, when reusing industrial waste as the polyolefin resin material 20, it is conceivable that a plurality of types of resins are mixed. However, if the material is compatible with the filler A1, several types of resins may be used. Can be used even if there is a mixture of.
[0018]
The mixing ratio of the wood flour 10 and the polyolefin-based resin material 20 can be appropriately determined according to the use of the molded article formed from the filler compound E1. In general, when a molded body is formed from a highly filled filler compound having a large amount of wood powder, deformation due to a temperature change is small, the weight is reduced, and the feeling of wood is improved. On the other hand, when the amount of the resin material is large, the fluidity of the heat-softened filler compound is large, and the produced molded article has high mechanical performance, which means strength, and has improved water resistance. The weight ratio of the two raw materials 10 and 20 can be appropriately selected according to the properties of the filler compound E1 and the properties required for the molded product. It can be kneaded.
[0019]
Note that an additive (not shown) made of a predetermined acid may be added to the filler compound E1 in order to improve the compatibility between the filler A1 and the resin material B1. For this additive, for example, maleic acid or the like is used. This maleic acid has an effect of improving the binding property of each other by being mixed with the filler A1 and the resin material B1.
[0020]
The filler compound manufacturing apparatus 30 includes a heating and melting device and a kneading device for performing melt kneading. Here, the device 30 heats the raw material mixture C1 by heating with a heating / melting device and shearing heat generated by generating a shearing force on the raw material mixture C1 with a kneading device. Since the raw material mixture C1 is heated by both, the resin material B1 is quickly melted, and a molten mixture D1 is generated. As a result, the filler A1 and the resin material B1 are quickly heated and melt-kneaded, and the filler is sufficiently heated and a sufficient amount of heat is applied to the filler compound E1 in a short time. Therefore, the continuous production of the filler compound is facilitated, and the production efficiency of the filler compound is improved.
[0021]
(2) Details of the filler compound production method:
FIG. 2 is a side view schematically showing the configuration of a filler compound manufacturing apparatus 30 for manufacturing a filler compound by the method for manufacturing a highly filled filler compound of the present invention, and FIG. 3 is a top view of the apparatus 30. Hereinafter, a method for producing a highly filled filler compound using the same apparatus 30 will be described. The filler compound manufacturing device 30 includes a material supply device 32, a mixture transport device (kneading device) 34, a heating and melting device 36, a molding device 38, a molded product transport device 40, and a control panel 42.
[0022]
The material supply device 32 has a hopper device 33 formed in a hollow substantially cylindrical shape and having an opening 32a on the upper surface. When the above-mentioned raw material mixture C1 is introduced through the opening 32a, the raw material mixture C1 can be stored in the hopper device 33. Therefore, when manufacturing the filler compound, first, an operation of charging the raw material mixture C1 into the hopper device 33 is performed.
[0023]
Inside the hopper device 33, a stirring member 33a and a stirring member connection disk 33b to which the stirring member 33a is connected are arranged at predetermined positions. The disc 33b is connected to a stirring member drive motor 33d via a belt 33c. The driving force of the motor 33d is transmitted to the stirring member connection disk 33b via the belt 33c, and drives the rotation of the disk 33b and the stirring member 33a. As a result, the materials A1 and B1 housed inside the hopper device 33 are agitated in a granular state and mixed substantially uniformly to form a raw material mixture C1. The raw material mixture C1 is transported from the raw material mixture discharge port to the mixture transport device 34 which is the next step.
[0024]
The mixture transporting device 34 is a single-screw extruding and kneading device arranged to melt-knead the raw material mixture. The granular material mixture C1 flows into the mixture transport device 34 from the material mixture carry-in port 34a.
FIG. 4 is a schematic diagram illustrating a configuration of a main part of the mixture transport device. The mixture conveying device 34 includes a hollow tube (space forming member) 34b that forms an internal space (kneading space) 34b1 for kneading the raw material mixture C1 on the inner wall surface, and kneading blades 35b disposed in the internal space 34b1. And a screw 35 having The hollow tube 34b has a substantially cylindrical shape. The screw 35 is disposed at a predetermined position in the internal space 34b1, and a screw shaft 35a is provided so as to pass through the axis of the hollow tube 34b along the longitudinal direction of the mixture transport device 34. The kneading blade 35b is formed in a substantially spiral shape, and is provided so as to apply a shearing force to the mixture C1, D1 between the outer peripheral end and the inner wall surface of the hollow tube 34b when being rotationally driven.
[0025]
The screw 35 has a kneading blade 35b formed of a plurality of flights of helical threads along the axial direction of the screw shaft 35a. That is, the kneading blade 35b is provided so as to function as a screw. The screw shaft 35a is provided with one end inserted into the molding device 38. The raw material mixture C1 carried in from the raw material mixture carry-in port 34a is temporarily stored in the internal space 34b1.
[0026]
Here, the screw 35 is provided with a screw shaft drive motor 34e via a gear portion 34d. The motor 34e drives a screw shaft 35a via a gear 34d. When the screw shaft drive motor 34e is driven, the raw material mixture C1 contained in the internal space 34b1 is extruded from the raw material mixture carry-in port 34a toward the molten mixture discharge port 34c while being melt-kneaded by the rotation of the screw 35. Go. When the screw shaft 35a is driven to rotate at a predetermined rotation speed, the mixtures C1 and D1 are extruded at a predetermined extrusion speed while applying pressure. Then, the molten mixture D1 is discharged from the molten mixture discharge port 34c, and an irregular-shaped filler compound E1 is generated.
The ability of the mixture transfer device 34 to transfer the molten mixture may be determined according to the time required for melting the resin material, the properties such as the viscosity of the softened molten mixture, and the like. At this time, by adjusting the size of the molten mixture discharge port 34c, the shape of the kneading blade 35b, and the rotation speed of the screw 35, a predetermined pressure is applied to the mixtures C1 and D1 in the internal space 34b1. I have. If this pressure is equal to or higher than the pressure at which the resin material in the molten state is substantially uniformly infiltrated with respect to the entire molten mixture D1 discharged from the molten mixture discharge port 34c, the heated and molten resin material is applied to the entire molten mixture D1. The filler and the resin material in the molten mixture D1 are compressed and the distance between the filler and the resin material in the molten mixture D1 is reduced, whereby the filler and the resin material are more bound and conform to each other. Accordingly, the discharged filler compound E1 is made uniform, and when the filler compound E1 is molded, cooled and solidified, a high-strength molded product can be formed.
[0027]
The pressure applied to the mixtures C1 and D1 can be adjusted as follows.
For example, reducing the size of the molten mixture outlet 34c increases the pressure on the mixture, and reducing the size of the outlet 34c decreases the pressure on the mixture. Further, if the rotation of the screw shaft 35a is increased, the pressure on the mixture can be increased, and if the rotation of the screw shaft 35a is reduced, the pressure on the mixture can be reduced. Further, by reducing the spiral pitch of the kneading blade 35b toward the discharge port 34c, it is possible to gradually increase the pressure applied to the mixtures C1 and D1 conveyed in the hollow tube 34b. Then, since a high pressure can be applied only to the molten mixture D1 in which the resin material is entirely melted, the pressure is efficiently applied to the mixtures C1 and D1 without consuming power for rotating the screw 35 more than necessary. It is possible to obtain a homogeneous and high quality filler compound E1.
In this way, a predetermined pressure is applied to the mixtures C1 and D1.
[0028]
The heating and melting device 36 is provided on the side of the hollow tube 34b. The mixture conveying device 34 heats the mixture C1, D1 by shearing heat generated by generating a shear force in the mixture, and the heating / melting device 36 is provided for further heating the mixture C1, D1.
The heating / melting device 36 generally includes a plurality of heaters 36a and a plurality of blowers 36b corresponding to the heaters 36a. The heater section 36a has a heating element (not shown), and the air heated to a high temperature by the heating element is blown to the hollow tube 34b by the blower section 36b, so that the mixture C1 and the mixture C1 in the hollow tube 34b are formed. Heat D1.
The heater section 36a has a configuration in which the heating temperature of the heating element can be adjusted according to the type of the resin material. Here, the heater portion 36a only needs to be able to raise the temperature to melt the resin material, and the heating capacity of the heater may be determined according to the type of the resin material. If the temperature of the molten mixture is higher than the melting point of the resin material and the heating of the heater is set so that the wood powder is not carbonized, both can be melt-mixed without carbonizing the wood powder. For example, when polypropylene is used as the resin material, the heating capacity of the heater may be set so that the molten mixture has a temperature of about 200 ° C. Thus, the heating and melting device 36 has a function of heating the mixture to a predetermined temperature.
[0029]
The generated filler compound E1 is carried into the molding device 38, and is molded into a predetermined shape to be a molded body. The molded product is transported by the molded product transport device 40, is appropriately selected, and is stored in the molded product storage unit.
The control panel 42 has a plurality of operation buttons and an operation display for monitoring the operation condition setting and operation state of the present filler compound manufacturing apparatus 30 arranged on the front side. The operator of the device 30 performs various operations using the control panel 42. Then, the control panel 42 controls the extrusion pressure and the time distribution required for the extrusion with respect to the mixture conveying device 34, and controls the heating temperature and the heating time with respect to the heating and melting device 36, and the like. The devices 32, 34, 36, 38, and 40 are integrally controlled.
[0030]
(3) Function of filler compound manufacturing method:
Hereinafter, the operation of the method for producing the highly filled filler compound will be described with reference to the drawings.
On the outer periphery of the screw shaft 35a, a spiral kneading blade 35b provided along the inner wall surface of the hollow tube 34b is provided. The outer peripheral end of the kneading blade 35b is disposed such that the clearance V between the outer peripheral end and the inner wall surface of the hollow tube 34b is a predetermined clearance. The kneading blade 35b is provided such that a predetermined clearance is provided between the outer peripheral end and the inner wall surface of the hollow tube 34b to generate shear heat insulation capable of melting the resin material B1 in the raw material mixture C1.
Here, in order to apply shearing force to the filler to generate shear heat insulation in the mixture, the interval V may be smaller than the diameter of the filler. For example, when the filler is substantially spherical, the interval V is preferably about 1/10 of the diameter of the filler. Therefore, when the diameter of the substantially spherical filler is about 100 μm, the interval V may be set to about 10 μm. When the filler is substantially fibrous, the interval V is preferably about 1/10 of the fiber diameter. Note that the filler is more likely to generate a shearing force when it is substantially fibrous than when it is substantially spherical, and shear heat is likely to be generated in the mixture.
[0031]
When the screw 35 is driven to rotate, the raw material mixture C1 is kneaded while being heated by the heating and melting device 36 provided therewith. Then, the raw material mixture C1 receives pressure and is conveyed while being compressed in the direction of the molten mixture discharge port 34c.
[0032]
When the rotation of the screw 35 is continued, the raw material mixture C1 is pushed in the direction of the molten mixture discharge port 34c (arrow 1), and the resin material B1 in the raw material mixture C1 is substantially melted. Is generated, and the molten mixture D1 is discharged from the mixture transport device 34 (arrow 2). Here, since a predetermined pressure is applied to the molten mixture D1, a part of the mixture C1, D1 is directed between the inner wall surface of the hollow tube 34b having the interval V and the outer peripheral end of the kneading blade 35b. Backflow in the direction of the raw material mixture carry-in port 34a (arrow 3).
[0033]
At this time, pressure is applied to the mixtures C1 and D1, and as shown in the upper part of FIG. 5, between the outer peripheral end 35b1 of the kneading wing 35b and the inner wall surface 34b2 of the hollow tube 34b with a clearance of the interval V. And a shear force on the mixture is created. Then, as shown in the middle part of the figure, the wood flour 10 in the mixture C1, D1 is sheared between the outer peripheral end 35b1 and the inner wall surface 34b2. As the kneading blade continues to rotate, a shearing force is applied to the mixture many times, and as shown in the lower part of the figure, the wood flour 10 is sheared, and sheared wood flour 11 is generated. The shear heat is generated in the mixture by the repeated application of the shearing force. Since the shearing force is continuously applied to the mixtures C1 and D1 while the driving of the kneading blade 35b is continued, the shear heat generated in the mixtures C1 and D1 increases. When the shearing heat generated in this way is accumulated and the raw material mixture C1 reaches a predetermined temperature, the unheated resin material remaining in the raw material mixture C1 is melted and uniformly dispersed throughout the raw material mixture C1. It becomes.
[0034]
As described above, the raw material mixture C1 including the fine-grained filler and the resin material is heated by the heating / melting device 36, and is subjected to shearing heat generated by generating a shear force on the mixtures C1 and D1 by the mixture conveying device 34. Is also heated. Since the mixtures C1 and D1 are heated by both, the unmelted resin material is quickly melted, and the filler and the resin material are quickly melt-kneaded to produce a filler compound. Therefore, sufficient heat can be given to the filler compound in a short time by sufficiently heating the filler, and continuous production of the filler compound can be facilitated, and the production efficiency can be improved. Here, since the filler compound to be produced is a homogeneous and high-quality mixture in which the filler and the resin material are uniformly mixed, the filler compound is molded, cooled and solidified to form a high-strength molded article. It is possible to do.
[0035]
(4) Second embodiment:
In the first embodiment described above, the raw material mixture C1 is melt-kneaded using the screw 35 to produce a filler compound. However, the raw material mixture C1 being heated and melted can be provided with shear insulation. If so, a device other than the screw 35 may be used, for example, a kneading die is provided in addition to the screw 35, and shear heat insulation is generated by the rotational motion of the die.
[0036]
FIG. 6 is a vertical cross-sectional view schematically showing the configuration of a kneading apparatus 50 for melting and kneading a filler compound by the method for producing a highly filled filler compound according to the second embodiment.
The kneading device 50 is a known batch type device for kneading cement or the like, also called a kneader. The apparatus 50 includes two mixing tanks (space forming members) 51 having an input port 51a having a substantially rectangular shape on the upper surface, and two shafts 52a and 53a rotatably mounted in a substantially horizontal direction. This is an apparatus provided with kneading rollers 52 and 53 for performing kneading for each batch. The discharge port 51b at the lower part of the mixing tank 51 is provided so as to be capable of opening and closing. When one batch of the fine-grained filler and the solid resin material is charged from the charging port 51a while the discharge port 51b is closed, a mixture composed of the filler and the resin material can be stored in the mixing tank 51. . Then, a kneading space 51d for kneading the mixture is formed on the inner wall surface 51c of the mixing tank 51.
[0037]
The kneading rollers 52, 53 are provided with kneading blades 52b, 53b continuous around the axes of the shafts 52a, 53a, and in the kneading space 51d, the shafts 52a, 53a are the rotation centers in the same direction (right in the figure). (Rotation). Here, a predetermined clearance of an interval V 'is provided between the kneading blades 52b and 53b. The kneading blades 52b and 53b are provided with a predetermined clearance therebetween, so that when they are driven to rotate, a shearing force is applied to the mixture between the kneading blades 52b and 53b to melt the resin material in the mixture. It is provided so that a great deal of shear insulation occurs.
Although the kneading wings 52b and 53b are illustrated as having a cross-sectional shape close to an ellipse in the figure for easy understanding, the kneading wings 52b and 53b do not necessarily mean to have an elliptical columnar shape. The shape may be complicated so as to be uniformly kneaded.
[0038]
Also in this case, if the interval V ′ is smaller than the diameter of the filler, a shearing force is exerted on the filler, so that shear insulation can be generated in the mixture. An interval suitable for generating a shear force in the mixture is the same as that in the first embodiment. For example, when the filler is substantially spherical, the interval V is preferably about 1/10 of the diameter of the filler. . When the filler is substantially fibrous, the interval V is preferably about 1/10 of the fiber diameter.
The kneading device 50 is provided with a heating and melting device (not shown). Then, the mixture is heated to a predetermined temperature and melt-kneaded by heating by the heating / melting device and shear heat generated by generating a shearing force in the mixture by the kneading device 50 to produce a filler compound. That is, a filler compound manufacturing device is constituted by the heating and melting device and the kneading device 50.
[0039]
Even with the above configuration, a shearing force is generated on the mixture between the kneading blades 52b and 53b. Then, the filler in the mixture is sheared between the kneading blades 52b and 53b. As the kneading blades 52b and 53b continue to rotate, a shearing force is applied to the mixture many times, the filler is sheared, and the sheared filler is generated. The shear heat is generated in the mixture by the repeated application of the shearing force. While the driving of the kneading blades 52b and 53b is continued, the shearing force is continuously applied to the mixture, so that the shear heat generated in the mixture increases. When the shear heat generated in this way is accumulated and the mixture reaches a predetermined temperature, the resin material remaining in the mixture and not heated and melted is melted and uniformly dispersed throughout the mixture.
[0040]
As described above, the mixture is heated by the heating and melting device, and also by the shear heat generated by generating a shear force in the mixture by the kneading device 50. Since the mixture is heated by both, the unmelted resin material is quickly melted, and the filler and the resin material are quickly melt-kneaded to produce a filler compound. Therefore, sufficient heat can be given to the filler compound in a short time by sufficiently heating the filler, and continuous production of the filler compound can be facilitated, and the production efficiency can be improved. Here, since the filler compound to be produced is a homogeneous and high-quality mixture in which the filler and the resin material are uniformly mixed, the filler compound is molded, cooled and solidified to form a high-strength molded article. It is possible to do.
As described above, according to the present invention, according to various aspects, it is possible to sufficiently heat the filler in the mixture to give a sufficient amount of heat to the filler compound in a short time, thereby facilitating continuous production and improving the filler compound. Production efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic flow chart showing a method for producing a highly filled filler compound according to a first embodiment.
FIG. 2 is a side view showing a schematic configuration of a filler compound manufacturing apparatus.
FIG. 3 is a top view illustrating a schematic configuration of a filler compound manufacturing apparatus.
FIG. 4 is a schematic diagram showing a configuration of a main part of a filler compound manufacturing apparatus.
FIG. 5 is a diagram schematically illustrating the operation of the method for producing a highly filled filler compound.
FIG. 6 is a vertical cross-sectional view schematically showing a configuration of a kneading apparatus in a second embodiment.
[Explanation of symbols]
A1: Filler
B1: resin material
C1: Raw material mixture
D1 ... Molten mixture
E1: Filler compound
10 ... wood flour
11 ... Sheared wood flour
20 ... Polyolefin resin material
30 ... Filler compound production equipment
34: Mixture transfer device (kneading device)
34b ... hollow tube (space forming member)
34b1: Internal space (kneading space)
34b2 ... inner wall surface of hollow tube
35 ... screw
35b ... Kneading wing
35b1 ... outer peripheral edge of kneading wing
36 ... Heating and melting equipment
50 ... Kneading device
51 ... mixing tank (space forming member)
51d ... kneading space
52, 53 ... kneading roller
52b, 53b ... kneading wings

Claims (4)

In a method for producing a highly-filled filler compound, a mixture comprising a fine-grained filler and a resin material is heated to a predetermined temperature and melt-kneaded.
A high-fill filler characterized in that the mixture is heated by heating with a heating and melting device, and by shear heat generated by generating a shearing force in the mixture by a kneading device provided for performing melt kneading. Compound manufacturing method. The kneading device has a space forming member that forms a kneading space for kneading the mixture on the inner wall surface, and kneading blades disposed in the kneading space. The method for producing a highly filled filler compound according to claim 1, wherein a shear force is applied to the mixture between an outer peripheral end and an inner wall surface of the space forming member. The kneading wing is formed in a substantially spiral shape, and is provided so that shear heat insulation capable of melting the resin material is generated by providing a predetermined clearance between an outer peripheral end and an inner wall surface of the space forming member. The method for producing a highly filled filler compound according to claim 2, wherein: The method for producing a highly-filled filler compound according to any one of claims 1 to 3, wherein the resin material is infiltrated into the entire mixture by applying a predetermined pressure to the mixture.

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