JP5956862B2 - Manufacturing apparatus and manufacturing method of pellets for manufacturing woody synthetic building materials - Google Patents

Description

  The present invention relates to a pellet manufacturing apparatus and a manufacturing method used for manufacturing a wooden synthetic building material using a mixed material of wood powder and a thermoplastic synthetic resin as a raw material.

  Conventionally, natural materials such as wood have been the mainstream as building materials, but recently, woody synthetic building materials for building formed by mixing wood powder and thermoplastic synthetic resin have become known. It has come to be used as exterior building materials and interior building materials. Such wood-based synthetic building materials are notable because they can effectively use waste materials (waste materials such as natural timber and synthetic building materials), as well as save petroleum resources as raw materials and reduce manufacturing costs. Collecting.

  When manufacturing a woody synthetic building material mixed with such wood powder, first, wood powder, synthetic resin powder (PVC powder, etc.), and other additives (stabilizer, pigment, etc.) are mixed and extruded. , Heated and melted, and extruded to produce raw material pellets. The raw material pellets were put into a molding machine (extrusion molding machine, injection molding machine, etc.), heated and melted, extruded from the mold, or injected into the mold. Then, a method of forming a final product is being carried out.

JP 2006-192741 A JP 2006-305981 A Japanese Patent Laid-Open No. 2003-3660 JP 2002-187116 A JP-A-9-216500

  When producing a synthetic wood building material by the conventional method as described above, a texture with a wood texture (appearance of wood grain that approximates the texture of natural wood) is displayed on the surface of the molded wood synthetic building material (final product). In order to achieve this, for example, by adding different pigments, the pellets of different colors are individually manufactured, the pellets having different colors are mixed as appropriate, and put into a molding machine to form a final product. It is necessary to devise such as.

  However, when producing multiple color pellets individually, it becomes necessary to manage the produced pellets for each color, and a process for blending these pellets at a predetermined ratio is required, which complicates the production line. There is a problem of end.

  The present invention is intended to solve the above-described problems of the prior art. Basically, only one type of pigment is used, and at least, two-colored pellets or pigment particle sizes are used. Manufacture of pellets for the production of woody synthetic building materials that can be produced in a mixed state, and can be suitably produced as a synthetic building material that has a grain-like appearance that approximates the texture of natural wood An object is to provide an apparatus and a manufacturing method.

  The pellet manufacturing apparatus for manufacturing a synthetic wood building material according to the present invention includes an extrusion molding machine that conveys the inside of the cylinder while heating and melting the raw material supplied into the cylinder, and extrudes from the die to produce pellets, and is supplied from a supply source. Main raw material transporter that quantitatively transports the mixture of wood powder, synthetic resin powder, and additives to be supplied to the extrusion molding machine, and unsteadily transports the pigment supplied from the supply source and extrudes And a pigment conveying machine to be supplied to the molding machine.

  The pigment conveyor has a screw conveyor that rotates in a predetermined direction and conveys the pigment, and the screw conveyor has a plurality of rotation modes (low speed rotation mode / high speed rotation mode / medium speed rotation mode / rotation stop mode). Etc.) are executed in order, or the speed of rotation of the screw conveyor changes with time by changing in a stepless manner from low speed to high speed, and the pigment is transported in an indefinite amount. It is preferable.

  Also, the pigment supplied from the supply source is pulverized in an irregular manner upstream of the pigment transporter that transports the pigment indefinitely (or the pigment transporter that transports the pigment quantitatively). In this case, the pigment mill may have a plurality of rotation modes (low speed rotation mode / high speed rotation mode / medium speed rotation mode / rotation stop mode, etc.) Are executed in order, or by steplessly changing from low speed to high speed, the rotational speed of the rotating part changes with time, and the pigment is crushed irregularly. preferable.

  Moreover, the manufacturing method of the wood synthetic building material manufacturing pellets according to the present invention is a method of quantitatively transporting a mixture of wood powder, synthetic resin powder, and additives supplied from a supply source by a main raw material transport machine and extrusion molding. In addition, the pigment supplied from the supply source is transported in an indefinite amount by the pigment transporter and supplied to the extrusion molding machine. In the extrusion molding machine, the inside of the cylinder is transported while being heated and melted. It is characterized by producing pellets by extrusion.

  In this case, multiple stages of rotation modes (low-speed rotation mode / high-speed rotation mode / medium-speed rotation mode / rotation stop mode, etc.) are executed in order in the screw conveyor that rotates in a predetermined direction in the pigment conveyor and conveys the pigment. It is preferable to change the rotational speed of the screw conveyor with time by changing the speed of the screw conveyor steplessly from low speed to high speed, thereby conveying the pigment in an indefinite amount.

  In addition, the pigment supplied from the supply source is pulverized irregularly by a pigment mill placed upstream of the pigment transporter that transports the pigment indefinitely (or the pigment transporter that transports the pigment quantitatively). In this case, a plurality of rotation modes (low-speed rotation mode / high-speed rotation mode / medium-speed rotation mode / rotation stop mode, etc.) are used in the rotating portion of the pigment mill. It is preferable to change the rotation speed of the rotating part of the pigment mill over time by executing in order or steplessly changing from a low speed to a high speed to pulverize the pigment in an irregular manner.

  The device for producing pellets for the production of woody synthetic building materials of the present invention basically uses only one kind of pigment, and at least produces two kinds of pellets of light and dark colors or two kinds of pellets with different pigment particle sizes. In addition, these pellets can be produced in a mixed state at a desired ratio, and by approximating the texture of natural wood by supplying the produced multiple types of pellets as they are to the molding machine A synthetic building material exhibiting a woodgrain appearance can be suitably manufactured.

FIG. 1 is a configuration diagram of a pellet manufacturing apparatus 1 according to the first embodiment of the present invention. FIG. 2 is a configuration diagram of the pellet manufacturing apparatus 1 according to the second embodiment of the present invention.

  Hereinafter, embodiments (first embodiment and second embodiment) of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a configuration diagram of a pellet manufacturing apparatus 1 (wooden synthetic building material manufacturing apparatus for pellets) according to a first embodiment of the present invention. As shown in the figure, the pellet manufacturing apparatus 1 basically includes an extruder 2, two quantitative feeders 3 (main raw material feeder 3A, pigment feeder 3B), and two screw conveyors 4 (main It is constituted by a raw material transport machine 4A and a pigment transport machine 4B).

  The extrusion molding machine 2 heats and melts the raw material supplied into the cylinder 2b from the introduction port 2a, conveys the inside of the cylinder 2b while kneading and compressing it, extrudes it from the die 2c with a predetermined pressure, and determines it with a cutter 2d. It is comprised so that a pellet may be manufactured by cutting to length.

  The quantitative feeder 3 is configured to store an object supplied from above (upstream side, supply source) inside and quantitatively discharge the object from the lower outlet, and the storage level of the object inside Is lower than the lower limit level LL, a supply valve (not shown) arranged at the upper end is opened to start supplying the object inside, and when the storage level of the object is higher than the upper limit level HL, the supply is started. The valve is closed and the supply of the object is stopped.

  Of the two quantitative feeders 3, the main raw material feeder 3A is supplied with a mixture of wood powder, synthetic resin powder (PVC powder, etc.) and additives other than pigments, and the pigment feeder 3B has a pigment ( Powder).

  The screw conveyor 4 is provided with a screw conveyor that rotates in a predetermined direction by receiving a driving force from a motor (not shown) in the cylinder, and is introduced into the cylinder from an introduction port formed on one end side of the cylinder. The target object is conveyed toward the discharge port (connected to the introduction port 2a of the extrusion molding machine 2 via the chute 5) formed on the other end side of the cylinder by the rotation of the screw conveyor. It is configured.

  Of the two screw conveyers 4, the main material conveyer 4A is a main material (wood powder, synthetic resin powder) or the like that is quantitatively supplied from the main material feeder 3A, with the screw conveyor rotating at a constant speed. This mixture is conveyed quantitatively and supplied to the extrusion molding machine 2 through the chute 5 from the discharge port.

  On the other hand, in the pigment conveyor 4B, under the control of the control device (not shown), the rotational speed of the screw conveyor changes every unit time (for example, every 5 minutes), from low to high, and from high to low. (The low-speed rotation mode and the high-speed rotation mode are executed alternately (in order)), and the pigment supplied quantitatively from the pigment feeder 3B is transported in an indefinite amount to be discharged. It is supplied to the extrusion molding machine 2 through the chute 5 from the outlet.

  More specifically, in the pellet manufacturing apparatus 1 of this embodiment, all of the raw material wood powder, synthetic resin powder, pigment, and additives other than the pigment are finally transferred to the extruder 2. Then, the pellets are produced, and the pigment and the other raw materials are separately conveyed through different paths, and just before the extrusion machine 2, that is, the chute 5 (the lower end is extrusion molding). Connected to the introduction port 2a of the machine 2 and connected to the discharge port of the main raw material transfer machine 4A and the discharge port of the pigment transfer machine 4B in the upper part) and supplied to the extrusion molding machine 2 It has become so.

  The raw materials other than the pigment are quantitatively transported in the main raw material transport machine 4A, while the pigment is transported non-quantitatively in the pigment transport machine 4B (more specifically, the screw conveyor is low speed). (The amount of pigment conveyed decreases when rotating, and the amount conveyed increases when rotating at high speed), so that the ratio of the pigment in the raw material that merges in the chute 5 changes over time. become. When the pigment and other raw materials are supplied from the chute 5 to the extrusion molding machine 2 in such a condition and subjected to extrusion molding, the pellets to be produced are light colored pellets having a relatively low pigment content, A dark pellet having a relatively high content will be mixed.

  In addition, the ratio of the dark-colored pellet and the light-colored pellet in the manufactured pellet can be suitably adjusted by adjusting the continuation time of each rotation mode in the screw conveyor of the pigment conveyor 4B. For example, when the duration of the high speed rotation mode and the duration of the low speed rotation mode are set to the same length, the ratio of the dark color pellets to the light color pellets can be 1: 1, and the duration time of the high speed rotation mode Is set to twice the duration of the low-speed rotation mode, the ratio of dark pellets to light pellets can be 2: 1.

  As described above, according to the pellet manufacturing apparatus 1 of the present embodiment, only one type of pigment is used (without using a plurality of color pigments), and dark and light two-color pellets are mixed. Can be manufactured. Then, by molding the final product using the two-color mixed pellets manufactured in this way, the surface has a texture with a wood texture (exhibits a grain-like appearance approximating the texture of natural wood) A woody synthetic building material can be suitably manufactured.

  In the present embodiment, the rotation mode of the screw conveyor in the pigment conveyor 4B is configured to be switched between two stages (low speed / high speed), but switched to three stages (low speed / medium speed / high speed). You may comprise so that it may be. In this case, three-color pellets of dark color, light color, and intermediate color can be manufactured. In addition, “rotation stop” can be added as one of the rotation modes, and in this case, a pellet of a ground color (color of wood powder, synthetic resin raw material, etc.) that does not contain a pigment is manufactured (dark pellet, light color) Mixed with pellets). Moreover, you may comprise so that the rotational speed of the screw conveyor of the pigment conveying machine 4B may change in a stepless manner from a low speed to a high speed.

  In the present embodiment, only one kind of pigment is used, a mixture of wood powder, synthetic resin powder, and additives other than the pigment is supplied to the main raw material feeder 3A, and the pigment is supplied to the pigment feeder 3B. However, it is also possible to use a plurality of types of pigments, one of which is supplied to the pigment feeder 3B, and the other pigment is supplied to the main raw material feeder 3A. Alternatively, a plurality of types of pigments may be supplied to the pigment feeder 3B.

  FIG. 2 is a configuration diagram of a pellet manufacturing apparatus 1 (wooden synthetic building material manufacturing apparatus for pellets) according to a second embodiment of the present invention. In the pellet manufacturing apparatus 1 of the present embodiment, a pigment mill 6 is disposed instead of the pigment feeder 3B at the position of the pigment feeder 3B shown in FIG. 1 (upstream side of the pigment conveyor 4B), and It differs from the pellet manufacturing apparatus 1 of the first embodiment only in that the screw conveyor of the pigment conveyor 4B is configured to rotate at a constant speed and quantitatively convey the pigment.

  In the pigment mill 6, under the control of a control device (not shown), the rotation speed of the rotating part (drum, cylinder, blade, etc.) changes every unit time (for example, every 5 minutes), and from low to high In addition, it is configured to switch from high speed to low speed (the low speed rotation mode and the high speed rotation mode are executed alternately (in order)), and the pigment supplied from the pigment supply source is irregularly shaped. And is supplied to the pigment conveyor 4B.

  More specifically, when the rotating part of the pigment mill 6 is rotating at a low speed, the pigment is not sufficiently pulverized, and a pigment having a relatively large particle size is supplied to the pigment conveying machine 4B and rotates at a high speed. In this case, the pigment is sufficiently pulverized and the pigment having a relatively small particle diameter is supplied to the pigment conveying machine 4B and blended with other raw materials in the chute 5. That is, the size of the pigment in the raw material that merges in the chute 5 changes over time. In such a condition, when the pigment and other raw materials are supplied from the chute 5 to the extrusion molding machine 2 and extrusion molding is carried out, the pellets to be produced include pellets containing small-diameter pigments having a relatively small pigment particle size, and pigments A large-diameter pigment-containing pellet having a relatively large particle size is mixed.

  In addition, the ratio of the pellet with a small diameter pigment and the pellet with a large diameter pigment in the manufactured pellet can be suitably adjusted by adjusting the duration of each rotation mode in the rotating part of the pigment mill 6.

  As described above, according to the pellet manufacturing apparatus 1 of the present embodiment, only one type of pigment is used (without using a plurality of color pigments), and two types of pellets are mixed. Can be manufactured. Then, by molding the final product using the two types of pellets produced in this way, the wood has a texture with a wood texture on the surface (exhibits a grain-like appearance similar to the texture of natural wood) A synthetic building material can be manufactured suitably.

  Specifically, in a molded product (woody synthetic building material), a pattern having a dynamic color difference appears on the part based on the pellet containing the large diameter pigment, while the color difference appears on the part based on the pellet containing the small diameter pigment. Natural flow patterns with small and delicate patterns will appear. These patterns appear in a mixed state on the surface of the molded product, and as a result, a woody synthetic building material in which a pattern like a natural wood grain is formed on the surface can be manufactured.

  In the present embodiment, the rotation mode of the rotating part in the pigment mill 6 is configured to be switched between two stages (low speed / high speed), but can be switched to three stages (low speed / medium speed / high speed). You may comprise. In this case, three types of pellets containing a small diameter pigment, a medium diameter pigment, and a large diameter pigment can be produced. In addition, as one of the rotation modes, “rotation stop” can be added. In this case, a pellet in which no pigment is mixed can be produced (mixed with a pellet containing a small diameter pigment, a pellet containing a large diameter pigment, etc.). Moreover, you may comprise so that the rotational speed of the rotation part of the pigment mill 6 may change continuously from a low speed to a high speed.

  Further, in the present embodiment, as described above, the screw conveyor of the pigment transport machine 4B is configured to rotate at a constant speed and transport the pigment quantitatively. As in the first embodiment, The rotation speed of the screw conveyor of the pigment conveyor 4B changes every unit time, and the low-speed rotation mode and the high-speed rotation mode are alternately executed to convey the pigment supplied from the pigment mill 6 in an indefinite amount. It may be configured. In addition, the rotation mode of the screw conveyor in the pigment conveyor 4B may be configured to be switched to three stages (low speed / medium speed / high speed), and “rotation stop” is added as one of the rotation modes. You can also. Moreover, you may comprise so that the rotational speed of the screw conveyor of the pigment conveying machine 4B may change in a stepless manner from a low speed to a high speed.

  Further, in the present embodiment, only one type of pigment is used, a mixture of wood powder, synthetic resin powder, and additives other than the pigment is supplied to the main raw material feeder 3A, and the pigment is supplied to the pigment mill 6. However, it is also possible to use a plurality of types of pigments, one of which is supplied to the pigment mill 6 and the other pigment is supplied to the main raw material feeder 3A. Alternatively, a plurality of types of pigments may be supplied to the pigment mill 6. Further, a pigment feeder 3B (see FIG. 1) similar to that of the first embodiment may be disposed on the upstream side of the pigment mill 6 or between the pigment mill 6 and the pigment transporter 4B.

1: pellet production equipment,
2: Extruder
2a: introduction port,
2b: cylinder,
2c: die,
2d: cutter,
3: Quantitative feeder,
3A: Main raw material feeder,
3B: Pigment feeder,
4: Screw conveyor
4A: Main raw material transfer machine,
4B: Pigment carrier
5: Shoot,
6: Pigment mill

Claims (10)

An extruder that conveys the inside of the cylinder while heating and melting the raw material supplied into the cylinder, and extrudes it from the die to produce pellets;
A main material conveying machine that quantitatively conveys a mixture of wood powder, synthetic resin powder, and additives supplied from a supply source and supplies them to an extrusion molding machine;
An apparatus for producing wood synthetic building material pellets, comprising: a pigment conveying machine that indefinitely conveys a pigment supplied from a supply source and supplies the pigment to an extrusion molding machine. The pigment conveyor has a screw conveyor that rotates in a predetermined direction and conveys the pigment,
The rotation speed of the screw conveyor changes over time due to the multi-stage rotation mode being executed in sequence on the screw conveyor or steplessly changing from low speed to high speed, and the pigment is conveyed indefinitely. It is comprised so that it may be made. The manufacturing apparatus of the pellet for woody synthetic building material manufacture of Claim 1 characterized by the above-mentioned. It has a pigment mill that pulverizes the pigment supplied from the supply source and supplies it to the extrusion molding machine via the pigment conveying machine,
The rotational speed of the rotating part of the pigment mill changes over time by executing a plurality of rotational modes in order in the rotating part of the pigment mill, or by steplessly changing from low speed to high speed. The apparatus for producing pellets for producing a woody synthetic building material according to claim 1 or 2, characterized in that is pulverized irregularly. An extruder that conveys the inside of the cylinder while heating and melting the raw material supplied into the cylinder, and extrudes it from the die to produce pellets;
A main material conveying machine that quantitatively conveys a mixture of wood powder, synthetic resin powder, and additives supplied from a supply source and supplies them to an extrusion molding machine;
An apparatus for producing pellets for producing a synthetic wood building material, comprising: a pigment mill for irregularly pulverizing a pigment supplied from a supply source and supplying the pigment to an extrusion molding machine.   In the pigment mill, the rotation speed of the rotation section changes over time by executing a plurality of rotation modes in order in the rotation section, or by steplessly changing from low speed to high speed, and the pigment is not stable. It is comprised so that it may grind | pulverize regularly, The manufacturing apparatus of the pellet for woody synthetic building material manufacture of Claim 4 characterized by the above-mentioned. A mixture of wood powder, synthetic resin powder, and additives supplied from a supply source is quantitatively transferred by a main material transfer machine and supplied to an extrusion molding machine, and a pigment supplied from the supply source is supplied to a pigment transfer machine. Indefinitely transported and supplied to the extrusion molding machine,
In the extrusion molding machine, a method for producing a pellet for producing a woody synthetic building material, wherein the pellets are produced by conveying the inside of a cylinder while heating and melting them and extruding them from a die.   The rotation speed of the screw conveyor is changed by executing a plurality of rotation modes in sequence in the screw conveyor that rotates in a predetermined direction in the pigment conveyor and conveys the pigment, or by steplessly changing from low speed to high speed. The method for producing pellets for producing a woody synthetic building material according to claim 6, wherein the pigment is transported indefinitely by changing with time.   By pulverizing the pigment supplied from the supply source and sequentially executing a multi-stage rotation mode in the rotating part of the pigment mill supplied to the extrusion molding machine via the pigment conveying machine, or from low speed to high speed. By changing the rotational speed of the rotating part over time by changing in stages, the pigment is pulverized irregularly, The woody synthetic building material manufacturing pellet according to claim 7, Production method. A mixture of wood powder, synthetic resin powder, and additives supplied from a supply source is quantitatively conveyed by a main material conveyance machine and supplied to an extrusion molding machine, and a pigment supplied from the supply source is supplied by a pigment mill. Irregularly crushed and supplied to the extrusion machine,
In the extrusion molding machine, a method for producing a pellet for producing a woody synthetic building material, wherein the pellets are produced by conveying the inside of a cylinder while heating and melting them and extruding them from a die.   The rotation speed of the rotating section is changed over time by sequentially executing multiple stages of rotation modes in the rotating section in the pigment mill, or by steplessly changing from low speed to high speed, and the pigment is indefinite. The manufacturing method of the pellet for woody synthetic building material manufacture of Claim 9 characterized by the above-mentioned.

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