JP2766800B2 - Manufacturing method of synthetic resin body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention is reusable,
The present invention relates to a method for producing a synthetic resin body suitable for various uses such as building materials and cushioning materials.

[0002]

2. Description of the Related Art Heretofore, there has been a pillar-shaped or plate-shaped synthetic resin square material or plate extruded from a die attached to an extruder. When manufacturing this square material or plate, the synthetic resin is extruded from a die, molded, cooled, and taken off by a take-off device. In order to form a square shape or a plate or the like into a certain shape and a certain amount while continuously extruding the same with an extruder, it is necessary to feed a synthetic resin at a certain volume to a forming device such as a vacuum sizing die. Since the synthetic resin is continuous and connected until it is extruded from the extruder and taken off by the take-off device,
It is desirable that the relation between the synthetic resin discharge volume of the extruder and the take-up speed of the take-off device is constant.However, if the discharge volume changes, it becomes impossible to send the synthetic resin to the molding device at a constant volume, so that a certain shape or Unable to mold with volume. In this regard, when extruding a reusable material such as recycled plastic, it is foamed, so that the synthetic resin discharge volume of the extruder may be uneven. For this reason, the discharge volume of the synthetic resin extruded from the extruder is constantly monitored, and when the discharge volume changes, the take-up speed is corrected to mold the resin into a fixed shape and volume. In the past, since this monitoring was performed by eye measurement, personnel for monitoring were required, and there was a trouble that a human had to monitor each time.

[0003] On the other hand, after the synthetic resin body is taken out by the take-up device, the synthetic resin body is connected in a series.
It is necessary to cut to a predetermined length by a cutting device. The interior of the synthetic resin body immediately after cooling is still hot, and if cut as it is, the internal synthetic resin expands and discharges from the cut surface.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention automates the monitoring of the volume of synthetic resin extruded from an extruder and automatically adjusts the take-off speed when the discharge volume of synthetic resin changes. The purpose is to correct it.

Another object of the present invention is to prevent the internal synthetic resin from expanding and discharging from the cut surface of the synthetic resin body when cutting the synthetic resin body immediately after cooling.

[0006]

According to a first aspect of the present invention, a synthetic resin mixed with a contaminant is continuously extruded by an extruder while being foamed, and immediately after the extruder, continuously extruded from the extruder. the extruded synthetic resin volume, cell
The sensor continuously and directly contacts the surface of the extruded synthetic resin.
It is detected by touching , the extruded synthetic resin is molded, the molded synthetic resin is cooled, the cooled synthetic resin body is taken by a take-up machine, and the take-up speed of the take-up machine is determined by the detection result of the sensor. It comprises a method of manufacturing a synthetic resin body configured to be adjusted.

According to a second aspect of the present invention, a synthetic resin mixed with contaminants is extruded by an extruder while being foamed, the extruded synthetic resin is molded, the molded synthetic resin is cooled, and the cooled synthetic resin is cooled. The body is taken off by a take-off machine, the synthetic resin body taken by the take-off machine is cut into a predetermined length by a cutting machine, and a cut surface is cooled by cutting at the cutting machine to cut the synthetic resin body. The method comprises a method of manufacturing a synthetic resin body configured to prevent the internal synthetic resin from expanding and discharging from the surface.

According to a third aspect of the present invention, the coated core material is extruded by a first extruder, and the synthetic resin mixed with the contaminant is extruded by a second extruder while foaming the synthetic resin. The synthetic resin extruded from the extruder is coated with a coating machine, and immediately after the coating machine, the volume of the synthetic resin coated in the coating machine is measured by a sensor.
Continuous direct contact with the surface of the extruded synthetic resin
The synthetic resin coated with the coated core material is molded, the molded synthetic resin is cooled, the cooled synthetic resin body is taken out by a take-up machine, and the take-up of the take-up machine is performed based on the detection result of the sensor. It comprises a method of manufacturing a synthetic resin body configured to adjust the speed.

According to the invention of claim 1, the synthetic resin is disposed a sensor was continuously extruded from the extruder immediately after the extruder volume (discharge volume), the extruded
Continuous direct contact with the surface of the synthetic resin
To detect. As a result of the detection, if the discharge volume is too large, the take-up speed of the take-up machine is increased so that the synthetic resin can be taken out quickly. As a result, the volume of the synthetic resin to be molded is automatically kept constant, and the resin is molded in a constant shape and volume. Conversely, if the result of the detection indicates that the ejection volume is too small, the take-up speed of the take-up machine is slowed down so that the synthetic resin is taken up slowly. Also in this case, the volume of the synthetic resin to be molded is automatically kept constant, and molding can be performed with a constant shape and volume.

According to the second aspect of the present invention, when cutting the synthetic resin body, the cut surface is cooled to prevent the internal synthetic resin from being expanded and discharged from the cut surface. Examples of a method for cooling the cut surface include watering the cut surface and blowing air. When cooled, a thin film is formed on the cut surface,
The internal synthetic resin is prevented from expanding and discharging from the cut surface.

According to the third aspect of the present invention, the coated core such as wood is extruded by the first extruder, the synthetic resin is extruded by the second extruder, and the coated core is coated with the synthetic resin by the coating machine. The sensor (disposed immediately after the coating machine) changes the volume (discharge volume) of the synthetic resin coating the coated core material.
Detect by continuous direct contact with the surface of the synthetic resin . As a result of the detection, if the discharge volume is too large, the take-up speed of the take-up machine is increased so that the synthetic resin can be taken out quickly. As a result, the volume of the synthetic resin to be molded is automatically kept constant, and the resin is molded in a constant shape and volume. Conversely, if the result of the detection indicates that the ejection volume is too small, the take-up speed of the take-up machine is slowed down so that the synthetic resin is taken up slowly. Also in this case, the volume of the synthetic resin to be molded is automatically kept constant, and molding can be performed with a constant shape and volume. That is, according to the present invention, even when a coated core material is used, the volume of the synthetic resin can be kept constant by using a sensor that is continuously in direct contact with the surface of the synthetic resin. That is, it is suitable for producing square materials and plate materials that require strength and durability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below.

FIG. 1 shows an embodiment of a manufacturing apparatus for carrying out the method for manufacturing a synthetic resin body according to the present invention. As shown in FIG. 1, the synthetic resin body manufacturing apparatus 1 has an extruder 2, and a die 3 is attached to a downstream end of the extruder 2. A cooling device 5 is installed on the downstream side of the die 3 in FIG. 1. The cooling device 5 includes a water tank 6, a cooling base 7, a guide plate 9, a vacuum pump valve 10, a vacuum pump 11, a motor 12, and a take-off molding machine 13. , Transmission motor 1
5, a faucet 16, a saucer 17 and water 18. That is, a cooling base 7 is provided at the entrance of the water tank 6, and a guide plate 9 is provided below the cooling base 7.
Further, a vacuum pump 11 is connected to the cooling base 7 via a vacuum pump valve 10, and a motor 12 is connected to the vacuum pump 11. A take-off molding machine 13 is provided in the water tank 6, and a speed change motor 15 is connected to the take-off molding machine 13. Further, a faucet 16 is provided above the water tank 6, and a receiving tray 17 is provided below the water tank 6, and water 18 is supplied from the faucet 16 into the water tank 6.
Can be supplied, and the water 18 in the water tank 6 can be discharged to the receiving tray 17 through the drainage port 6a.

A take-up roll 19 composed of four rollers is provided downstream of the cooling device 5, and a cutting device 20 is provided downstream of the take-up roll 19. A water jetting device 22 is disposed before and after the cutting device 20 in the traveling direction of the synthetic resin body 25, and a jet port faces a cut surface of the synthetic resin body 25 by the cutting device 20. Water spouting device 22
A pair of holding plates 23 for holding the synthetic resin body 25 at the time of cutting are provided above. Further, a length adjustment limit switch plate 21 is provided downstream of the cutting device 20.

As shown in FIG. 2, a die 3 and a cooling base 7 are provided.
1, two limit switches 26 are provided (in addition to those shown in FIG. 1, another one is provided on the depth side of FIG. 1. The former is the first limit switch 26 and the latter is the latter. Is referred to as a second limit switch 26.) Note that the number of limit switches 26 may be one, or may be three or more. The two limit switches 26 measure the volume of the synthetic resin discharged from the die 3. In FIG. 2, the upper surface of the synthetic resin is contacted by the limit switch 26, but the invention is not limited thereto, and the upper surface of the synthetic resin may be contacted by the side surface. The limit switch 26 is connected to a limit switch relay 29,
The limit switch relay 29 is connected to the inverter 27. The inverter 27 is connected to a take-up machine 28 that controls the take-up roll 19.

Since the manufacturing apparatus 1 has the above configuration, when manufacturing a synthetic resin body using the manufacturing apparatus 1, sawdust, rice hull or activated carbon and calcium carbonate are added to a synthetic resin (for example, polypropylene). , Volcanic ash, talc, and the like, and the mixture is supplied to the extruder 2 while being heated at about 150 to 250 ° C. Next, the synthetic resin is extruded through the die 3 while being foamed, and is introduced into the water tank 6 through the guide plate 9 and the cooling base 7. Then, the synthetic resin foams and a synthetic resin body having irregular irregularities on its surface is generated. Further, while being vacuum-vacuum by the vacuum pump 11, it is taken out by the take-off molding machine 13, and is taken up by the take-up roll 19 while being cooled by the water 18 stored in the water tank 6. When the collected synthetic resin reaches the length adjustment limit switch plate 21, the limit switch is operated, and the cutting device 20 cuts the synthetic resin into a predetermined length to manufacture the synthetic resin body 25. As shown in FIG. 3, at the time of cutting, the synthetic resin body 25 is pressed and fixed by the pressing plate 23, and the synthetic resin body 25 is
Sprinkle water on the cut surface. Even after the synthetic resin is cooled by the cooling device 5, the inside of the synthetic resin body 25 is kept at 150 ° C. to 200 ° C.
Since the temperature is in ° C., if the cut surface is cut without cooling, it is difficult to cut the synthetic resin body 25 because it is sticky, and the internal synthetic resin expands and discharges from the cut surface. In order to prevent this, cutting is performed while water is applied to the cut surface of the synthetic resin body 25. As a result, the synthetic resin body 25 is cooled with water and easily cut, and the cut surface is coated with water at 100 ° C., so that the synthetic resin inside does not swell and discharge. At this time, by forming the die 3 into various shapes, the synthetic resin body 25 can be formed into various shapes (for example, a flat plate shape, a cylindrical shape, a prismatic shape, and the like) according to its use.

Further, for effective use of resources, both sides of the synthetic resin body 25 are slit, and the slit pieces are put into a pulverizer (not shown) and pulverized.
You may make it supply to the extruder 2 again.

Here, as the synthetic resin, two or more kinds having different molecular structures can be used. Further, before extruding the synthetic resin while foaming it, moisture or a plasticizer, a foaming agent, or the like may be added to the contaminant while adjusting the amount to a fixed amount.

On the other hand, as shown in FIG. 2, the volume of the synthetic resin extruded from the extruder 2 through the die 3 is measured by a limit switch 26. The signal measured by the limit switch 26 is transmitted to the inverter 27 via the limit switch relay 29.
The inverter 27 controls the take-up speed of the take-up roll 19 of the take-up machine 28 in response to the measurement signal.

Here, the first limit switch 26 is set to operate when the volume of the synthetic resin extruded from the die 3 is too small, and the second limit switch 26 is set to the volume of the synthetic resin extruded from the die 3. Set to work when too large.

The operation of the limit switch 26 and the operation of the inverter 27 will be described with reference to FIG. In step 30, the extruder 2 discharges the synthetic resin at a constant discharge rate. In step 31, the speed of the take-off machine 28 is adjusted by the inverter 27. When the first limit switch 26 is turned on in step 32, the inverter 27 operates the take-up machine 28 at the speed of mode 1 (speed lower than usual) set in the inverter 27 in advance in step 33. As a result, the amount of the synthetic resin at the inlet of the cooling die 7 accumulates, so that the molding becomes constant. In step 32, the first limit switch 2
6 is OFF, and the second limit switch 2
6 is turned on, the inverter 27 sets the take-up machine 28 to the inverter 27 in advance in step 35.
At a speed (faster than usual). As a result, the synthetic resin accumulated at the inlet of the cooling mouthpiece 7 is sent one after another, so that the molding becomes constant. Second in step 34
When the limit switch 26 is OFF, the first and second limit switches 26 have not been turned ON.
In step 36, the inverter 27 operates the take-up machine 28 to take up the synthetic resin at a normal speed. By this repetition, the volume of the synthetic resin fed into the cooling base 7 is kept constant, and as a result, it is possible to mold with a fixed shape and a fixed volume.

Next, a second embodiment of the present invention will be described.

FIG. 5 shows a manufacturing apparatus 51 for carrying out the method for manufacturing a synthetic resin body according to the second embodiment of the present invention.
Is shown. In the second embodiment, the configuration is basically the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 5, the synthetic resin body manufacturing apparatus 51 has a wood collecting section 37. Wood accumulation part 37
, Wood 38 serving as a coating core material of the synthetic resin coating body 44 is accumulated, and the wood 38 is discharged one by one from the lower end. At the lower end discharge side (right side in FIG. 5) of the wood accumulation part 37, feed rollers 39 are provided up and down so as to feed the wood 38 discharged from the wood accumulation part 37. A die 43 is mounted downstream of the feed roller 39. On the other hand, an extruder 42 is provided above the die 43 via a feed pipe 41. The synthetic resin containing the same contaminants as in the first embodiment is supplied to the extruded material 42, and the synthetic resin is fed to the die 43 via the feed pipe 41.

The die 43 is provided with the dies 43 shown in FIGS.
The configuration is as shown in (c), and the overall configuration is a substantially rectangular parallelepiped. Inside this substantially rectangular parallelepiped shape, the wood passage 45 forms a space in the shape of a square pole. Here, the wood 38 discharged from the wood accumulation unit 37 is shown in FIG.
(B) It is fed in from the left, and the wood passage 45 is a passage through which the wood 38 passes. In the upper part of the die 43, a synthetic resin inlet 46 is provided in a cylindrical shape.
The synthetic resin extruded from 2 enters through the synthetic resin inlet 46 and reaches inside the die 43. A circular section 47 having a square cross section in the width direction is formed on the exit side of the wood passage 45 so as to surround the wood passage 45. The outer wall of the orbiting portion 47 has a smaller side of a square cross section toward the cooling device 5, and the inner wall is a boundary wall with the wood passage 45. A synthetic resin inlet 46 is connected to the upper end of the circling portion 47. An outlet portion 48 is formed adjacent to the orbiting portion 47 and the wood passage 45 in the direction of the cooling device 5. The outlet section 48 also has a square cross section in the width direction, and the outer wall has one side of the cross section square smaller toward the cooling device 5. The synthetic resin entered from the synthetic resin inlet 46 enters the orbiting portion 47 and is filled with the synthetic resin. The synthetic resin flows into the outlet 48 and covers the wood 38 that has passed through the wood passage 45 at the outlet 48. Is set at a position where the synthetic resin is uniformly coated around the wood 38.

The first between the die 43 and the cooling device 5
As in the embodiment, two limit switches 26 are provided, and the volume of the synthetic resin discharged from the dice 43 is measured. The first embodiment describes a measuring method of the limit switch 26, a control method of the take-off machine 28, and configurations and actions of the cooling device 5, the take-up roll 19, the cutting device 20, the holding plate 23, and the length adjusting limit switch plate 21. Is the same as

The operation of the second embodiment of the present invention will be described.

The wood 38 discharged from the lower end of the wood stacking section 37 is fed one by one to a die 43 by a feed roller 39 and proceeds to a wood passage 45 of the die 43. on the other hand,
The synthetic resin extruded from the extruder 42 is
Through the synthetic resin inlet portion 46 of the die 43, and into and around the circling portion 47, and fills the outlet portion 48 with the wood 38 flowing into the outlet portion 48 and traveling through the wood passage 45. During coating, the wood 38 is kept in the cooling device 5.
Progressing in the direction. In the die 3, the wood 38 is coated while foaming the synthetic resin using water contained in the contaminant of the synthetic resin. The synthetic resin covering the wood is discharged from the die 43, and the volume of the synthetic resin covering the wood 38 is measured by the limit switch 26, and the speed of the take-off roll 19 of the take-off machine 28 is controlled based on the measurement result. Thereby, even when the core material has the coating core material, the volume of the synthetic resin fed into the cooling device 5 is kept constant, and it is possible to mold the synthetic resin into a fixed shape and a fixed volume.

FIGS. 7 (a), 7 (b), 7 (c) and 7 (d) show the forms in which the coated core material and the synthetic resin cover the coated core material.
As shown in FIG. In this case, the contact position of the limit switch 26 with the synthetic resin is also set to an optimal position according to each mode. Although the covering core is made of wood in the present embodiment, metal, reinforced plastic, or the like may be used instead of wood.

[0030]

According to the first aspect of the present invention, the synthetic resin mixed with the contaminant is continuously extruded by an extruder while being foamed, and immediately extruded from the extruder immediately after the extruder. the volume of the synthetic resin, the sensor is
Continuous direct contact with the surface of the extruded synthetic resin
It is detected by this, the extruded synthetic resin is molded,
Cooling the molded synthetic resin, taking the cooled synthetic resin body by a take-off machine, and adjusting the take-up speed of the take-up machine according to the detection result of the sensor. Therefore, the volume of the synthetic resin to be molded can be automatically kept constant and can be molded with a constant shape and volume. Therefore, it is not necessary to arrange a person for monitoring the volume of the synthetic resin discharged from the extruder, and the labor cost can be reduced.

According to the second aspect of the present invention, the synthetic resin mixed with the contaminant is extruded by an extruder while being foamed, the extruded synthetic resin is molded, and the molded synthetic resin is cooled and cooled. The synthetic resin body taken off by the take-off machine, the synthetic resin body taken by the take-off machine is cut into a predetermined length by a cutting machine, and a cut surface is cooled at the time of cutting by the cutting machine to cool the synthetic resin body. Since the synthetic resin body is manufactured so as to prevent the internal synthetic resin from expanding and discharging from the cut surface of the body, the internal synthetic resin expands from the cut surface when cutting the synthetic resin body. Discharge is prevented.

According to the third aspect of the present invention, the coated core material is extruded by the first extruder, and the synthetic resin mixed with the contaminant is extruded by the second extruder while foaming.
The coated core is coated with a synthetic resin extruded from the second extruder by a coating machine, and immediately after the coating machine,
The volume of the synthetic resin coated in the coating machine ,
A sensor is continuously and directly on the surface of the extruded synthetic resin.
Detecting by contact , molding the synthetic resin coated with the coated core material, cooling the molded synthetic resin, withdrawing the cooled synthetic resin body with a take-off machine, and using the detection result of the sensor, the take-off machine Since the method consists of a method of manufacturing a synthetic resin body that is configured to adjust the take-up speed, even when a coated core material is used, the volume of the synthetic resin to be molded is automatically kept constant and a fixed shape And can be molded in volume. Therefore, it is not necessary to arrange a person for monitoring the volume of the synthetic resin discharged from the coating machine, and the labor cost can be reduced.

[0033]

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an apparatus for manufacturing a synthetic resin body according to a first embodiment of the present invention.

FIG. 2 is an enlarged view around a limit switch according to the first embodiment of the present invention.

FIG. 3 is an enlarged view near a cutting device according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing operations of a limit switch and an inverter according to the first embodiment of the present invention.

FIG. 5 is an overall configuration diagram of an apparatus for manufacturing a synthetic resin body according to a second embodiment of the present invention.

FIGS. 6A and 6B are views showing a dice according to a second embodiment of the present invention, wherein FIG. 6A is a view as seen from the direction of entrance of wood, FIG. 6B is a sectional view taken along line AA ′ of FIG. ) Is a plan view near the synthetic resin inlet.

FIGS. 7A and 7B are cross-sectional views showing various forms of a coated core material and a coated synthetic resin, wherein FIG. 7A is an example in which the coated synthetic resin is rectangular but partially protruded, and FIG. For example,
(C) is an example in which the coating synthetic resin is square and the coating core is large, and (d) is an example in which the coating synthetic resin is circular.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Synthetic resin body manufacturing device 2 Extruder 5 Cooling device 13 Take-off molding machine 20 Cutting device 22 Water discharge device 25 Synthetic resin body 26 Limit switch 27 Inverter 28 Take-off device 29 Limit switch relay 37 Wood accumulating unit 38 Wood 42 Extruder 43 Dies 51 Synthetic resin body manufacturing equipment

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FIB29L 9:00 (56) References JP-A-60-105519 (JP, A) JP-A-1-269517 (JP, A) JP 2-111517 (JP, U) JP 7-16996 (JP, B2) JP 5-81430 (JP, B2)

Claims (3)

(57) [Claims] A synthetic resin mixed with a contaminant is foamed.
While continuously extruded by an extruder, immediately after the extruder, continuously extruded from the extruder
The sensor was pushed out of the volume of synthetic resin
Detection by continuous direct contact with the surface of the synthetic resin
Then, the extruded synthetic resin is molded, the molded synthetic resin is cooled, the cooled synthetic resin body is taken by a take-up machine, and the take-up of the take-up machine is performed based on a detection result of the sensor.
Synthetic resin body configured to adjust speed
Manufacturing method. 2. A synthetic resin mixed with a contaminant is foamed.
While extruded by an extruder, the extruded synthetic resin is molded, the molded synthetic resin is cooled, the cooled synthetic resin body is taken by a take- off machine, and the synthetic resin body taken by the take-off machine is cut into a cutting machine. Yo
To a predetermined length, and at the time of cutting with the cutting machine, the cut surface is cooled and the synthetic resin is cut.
Check that the synthetic resin inside expands and discharges from the cut surface of the oil body.
The manufacturing method of the synthetic resin body comprised so that it may prevent. 3. Extruding the coated core material by a first extruder.
The second pressing is performed while foaming the synthetic resin mixed with the contaminant.
Extruding the extruder, extruded from the second extruder into the covering core material synthesis
The resin was coated by a coating machine, and immediately after the coating machine, the synthetic coating was performed in the coating machine.
The volume of the resin is adjusted by the sensor
Detecting by continuous direct contact with the surface of the resin, molding the synthetic resin coated with the coated core material , cooling the molded synthetic resin, taking off the cooled synthetic resin body by a take-off machine, the sensor According to the detection result of
Synthetic resin body configured to adjust speed
Manufacturing method.