JP2000043981A - Tank-type container for polycarbonate resin pellet and transportation method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank-type container having a large capacity whose strength can be sufficiently kept and which can be protected from the outside wherein polycarbonate resin pellets can be efficiently transported either by land or by sea. SOLUTION: The tank-type container comprises an elongated and falling drum-shaped tank body 3 and a parallelopiped container frame 5 surrounding the tank body 3, wherein the tank body 3 includes an inlet tube 20 at a front upper end and a discharge tube 21 at a rear lower end and is equipped on the exterior with an air supplying device for supplying compressed air for discharging polycarbonate resin pellets. The tank body 3, the inlet tube 20, the discharge tube 21 and the air supplying device are received in a space surrounded by the container frame 5, and a locking jig 6 with which a locking mechanism of a platform of a trailer or the like can be engaged is provided. Therefore this container is applicable either to land transportation or to marine transportation as a large capacity container, thereby improving transfer efficiency for the polycarbonate resin pellets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank type container for filling and transporting polycarbonate resin pellets and a transportation method using the container, and particularly to a polycarbonate resin applicable to both land transportation and sea transportation. The present invention relates to a tank type container for pellets and a transportation method using the container.

[0002]

2. Description of the Related Art As a means for transporting polycarbonate resin pellets, a small container having a rectangular box-shaped tank body 50 as shown in FIG. There is a container with a mold tank body. In both cases, the inlet 51
Is provided with a discharge valve 54 at the lower end via a hopper 53, and a leg frame 55 is provided to stabilize the installation.

As shown in FIG. 10, a large drum-type tank body 57 in a lying state is used for large-capacity transportation. The tank body 57 is directly fixed in a naked state to a dumping bed 58 of a truck or a trailer. Offered as a car.

[0004] At the front upper end of the tank body 57, a feeding pipe 62 for polycarbonate resin pellets is provided. At the lower rear end, a discharge pipe 65 is provided via a hopper 63.
Are tilted to the front rising state by the extension of the hydraulic cylinder 59.

[0005]

With the rectangular box-shaped small container shown in FIG. 9, only small-capacity containers can be manufactured in terms of strength. Therefore, a large number of containers are loaded on one truck or trailer. It has to be transported, which is troublesome to handle and the transport efficiency is not good. Also,
Since a large space is provided for accommodating the hopper 53 and the discharge valve 54, the space is wasted.

A small container having a vertical flat drum type tank body is more durable than the rectangular box shape shown in FIG. 9, but even if the diameter is increased in order to increase the capacity, a space is required in the rectangular truck bed. It is difficult to efficiently mount the device, and the capacity cannot be increased. In addition, it is also difficult to increase the height of the truck and the like in view of the limitation of the height of the truck and the stability.

In the case of a tank truck as shown in FIG.
Since the trunk drum type tank main body 57 is mounted in the lying posture, it is possible to increase the capacity in terms of strength and adaptability to the shape of the truck bed 58.
However, since the tank body 57 is permanently welded to the truck bed 58, it can be used for land transportation but cannot be used for sea transportation.

In addition, since the tank body 57 is mounted in a bare state, the tank body 57 and the attached equipment such as the discharge pipe 65 disposed on the surface of the tank body 57 are likely to collide with external objects and be damaged.

Further, one truck is required for one tank body 57, which is economically inefficient.

In particular, in the case of optical polycarbonate resin pellets, it is inevitable that the pellets collide with each other due to vibration during transportation and generate fine powder. If this fine powder is present in an optical polycarbonate resin pellet to be molded in a certain amount or more, the optical disk molded from the pellet will have various defects as a recording material due to generation of silver and generation of carbide.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a large-capacity tank-type container which can secure sufficient strength and can be protected from the outside, and can efficiently produce polycarbonate resin pellets both on land and at sea. It is another object of the present invention to provide a tank-type container that can be transported without generating fine powder, and a transport method using the container.

[0012]

According to a first aspect of the present invention, there is provided a tank type container according to the first aspect of the present invention, wherein a drum-shaped tank body having a trunk length and a lying posture is provided, and a rectangular box-shaped container frame surrounding the tank body. The tank body is provided with an inlet pipe at the front upper end in the longitudinal direction, a discharge pipe at the rear lower end, and an exterior air supply device for supplying compressed air into the tank body, The tank body, the input pipe, the discharge pipe, and the air supply device are housed in a space surrounded by a container frame, and a lower end portion of the container frame is capable of engaging with a lock mechanism provided on a carrier such as a trailer. The input pipe protrudes forward and upward, the discharge pipe protrudes rearward and upward, and when the tank body is tilted upward, the input pipe faces upward and the discharge pipe faces substantially horizontally rearward. It is characterized by It is.

According to a second aspect of the present invention, in the tank type container according to the first aspect, an air supply device is provided with air ejection pipes at a front upper end portion and a rear lower end portion of the tank body, and at the rear side of the tank body. An air blowing pipe connected to a compressed air supply source is arranged, and an air pressure feeding pipe branched from the air blowing pipe to each of the air ejection pipes is arranged along the surface of the tank body.

A third aspect of the present invention is characterized in that the polycarbonate resin pellets are transported by using the tank type container for the polycarbonate resin pellets according to the first aspect.

[0015]

FIG. 1 is a side view of a tank-type container 1 for transporting polycarbonate resin pellets to which the present invention is applied and a trailer 2 on which the tank-type container 1 is interchangeably mounted. The loading platform 4 has a rear end rotatably supported via a hinge 15, a front end supported movably up and down via a multi-stage hydraulic cylinder 8, and extends the hydraulic cylinder 8. By doing
It is designed to be able to tilt to the forward dumping state. At the four corners of the upper surface of the carrier 4, mushroom-type lock claws 7 rotatable around a vertical axis are provided in a protruding shape.

The tank type container 1 comprises a drum-shaped tank body 3 having a body length, and a rectangular box-shaped container frame 5 surrounding the tank body 3. The container frame 5 is formed in a rectangular parallelepiped shape which is long in the front-rear direction, and a block-shaped locking metal member 6 is integrally welded as a corner metal member. Container frame 5
The vertical pipe 10, the horizontal horizontal pipe 11 extending long in the front-rear direction, the inclined reinforcing pipe 14 for connecting and reinforcing between the upper and lower horizontal pipes 11, and the connecting between the left and right horizontal pipes 11 A horizontal connecting pipe 12 is provided, and each uses a square pipe. On the lower surface of the container frame 5, spaces S1 and S2 for inserting claws of a forklift are secured.

In the container frame 5, a pair of front and rear mounts 9 for mounting the tank body are welded. The mount 9 has an arc-shaped mounting surface 9a as shown in FIG. The drum-type tank main body 3 is fitted in a prone position and welded to 9a.

As shown in FIG. 1, the tank main body 3 has a drum core oriented in a front-rear direction, and a charging pipe 20 for charging polycarbonate resin pellets into the tank main body 3 is provided at the upper front end. A discharge pipe 21 for discharging polycarbonate resin pellets is provided at the rear lower end, and a manhole 18 is provided at the front upper end face. The charging tube 20 projects forward and upward, and is covered with a cap 23 when not in use. The discharge pipe 21 is attached to a hopper 25 formed at the rear lower end of the tank body 3 so as to protrude rearward and upward, and is covered with a cap 24 when not in use. The input pipe 20 is inclined at an angle of 45 ° upward with respect to the horizontal, and the discharge pipe 21 is inclined at an angle of 45 ° upward with respect to the horizontal. When inclined at an angle θ of 45 °,
0 faces vertically upward, and the discharge pipe 21 faces horizontally rearward.

The tank body 3 is provided with a compressed air supply device. As the compressed air supply device, as shown in FIG. 1, a front air opening in the tank body is provided on the side of the front upper end of the tank body 3. An ejection pipe 27 is provided, a rear air ejection pipe 28 is connected to the tip of the hopper 25 at the rear lower end, and an air injection pipe 29 is arranged on the rear side of the tank body 3 as shown in FIG. The air blowing pipe 29 is branched into left and right air pressure feeding pipes 30 and 31 via a T-shaped pipe 32, and one of the air pressure feeding pipes 30 rises beside the tank body 3 and extends along the surface of the tank body 3. 4 and is connected to the front air ejection pipe 27, and the other air pressure feeding pipe 31 is connected to the rear air ejection pipe 28 as shown in FIG. are doing.

FIG. 8 is an enlarged vertical cross-sectional view of the hopper 25. The enlarged opening 28a of the air ejection pipe 28 is connected to the open end of the hopper 25 via a filter 36, and the discharge pipe 21 is connected to the hopper 25. Inside, it is curved so as to face the air ejection pipe 28. An opening / closing valve 37 is provided in the middle of the discharge pipe 21.

As shown in FIGS. 1, 3 and 4, the tank body 3, the input pipe 20, the discharge pipe 21, the manhole 18, and the air supply device are provided with the front-rear width, the left-right width, and the width of the container frame 5. It is completely housed within the vertical width and does not protrude outside from the space surrounded by the container frame 5.

FIG. 6 is a horizontal sectional view of the lock fitting 6 provided on the lower end side of the container frame 5, which is formed in a hollow box shape and has a long hole 16 long in the front-rear direction on the lower wall. . On the other hand, the lock claw 7 is formed in an oval shape that can pass through the elongated hole 16, passes through the elongated hole 16 in a state where it is directed forward and backward as indicated by a virtual line, and is positioned right and left as indicated by a solid line. By rotating 90 ° around the vertical axis until the lock metal 6 is pressed against the loading platform 4 as shown in FIG. 5, it is fixed. In addition, as shown in FIG. 2, the lock fitting 6 arranged on the upper end side of the container frame 5 has a long hole 16 in its upper wall.
Is formed.

On the upper surface of the container frame 5, a landing 43 made of punched metal or mesh board is provided on both left and right sides along the left and right upper horizontal pipes 11 and before and after the manhole 18.

[0024]

When mounting the tank type container 1 on the trailer 2, there are a method of lifting the tank container 1 with a forklift at a filling factory or a warehouse, and a method of lifting it with a crane at a port or the like.

When mounting with a forklift,
A lift claw is inserted into the claw insertion space S1 or S2 of the container 1 in FIG. 1, and the container 1 is lifted and placed on the carrier 4 or lowered from the carrier 4. The narrow inner space S2 is used when handling an empty tank type container 1, and the wide outer space S1 is used when handling a filled tank type container 1 to ensure stability.

When a normal crane or a gantry crane is used for lifting at a port or the like, a lifting jig shown in FIG.
Mushroom-shaped locking claw 7 similar to the trailer 2
The container 1 is lifted by attaching the frame-shaped jig 40 having the above to the hanging wire and connecting the lock claw 7 to the upper surface locking metal fitting 6 of the tank type container 1.

When the tank body 3 is filled with the polycarbonate resin pellets, as shown in FIG.
Then, an upper polycarbonate resin pellet supply hopper or the like is connected via a flexible connection pipe 41 as shown by a virtual line, and the polycarbonate resin pellets are charged into the tank body 3 from the charging pipe 20. In this case, the open / close valve 37 of the discharge pipe 21 is closed. After filling, an external compressed air supply source (air compressor, etc.) via a hose (not shown)
And pressurizing air into the tank body 3 appropriately to thereby increase the pressure inside the tank, thereby suppressing the movement of the polycarbonate resin pellets due to vibration during transportation and preventing the generation of fine powder. .

When the polycarbonate resin pellets are discharged from the tank body 3, as shown in FIG.
At the same time, the receiving hopper 48 is connected to the discharge pipe 21 via the flexible hose 47 at an angle of 5 °. Further, an external compressed air supply source (such as an air compressor) is connected to the air blowing pipe 29 of FIG. 2 through a hose (not shown), and the front and rear air blowing pipes 27 and 28 are connected through the air pressure feeding pipes 30 and 31. To each other. In the hopper 25, the polycarbonate resin pellets are pressure-fed into the discharge pipe 21 by the compressed air blown out from the air blow-off pipe 28 as shown in FIG. 8, and pass through the discharge pipe 21 to the receiving hopper 48 in FIG. Is discharged. On the other hand, compressed air is press-fitted into the upper end of the tank body 3 from the front air ejection pipe 27 to pressurize the inside of the tank body 3 and quickly press down the polycarbonate resin pellets. To prevent loss of compressed air and promote discharge of polycarbonate resin pellets.

As the thermoplastic resin, in addition to the polycarbonate resin according to the present invention, polyolefin resin (polyethylene resin, polypropylene resin, etc.), acrylic resin, styrene resin, ABS resin, polyamide resin, polyester resin (polyethylene terephthalate resin, polyethylene resin) Examples thereof include a naphthalate resin and a polybutylene terephthalate resin), a polycarbonate resin, and a vinyl chloride resin. In the present invention, the polycarbonate resin is employed as described above.

The shape of the polycarbonate resin pellets in the present invention is not particularly limited as long as they are used for molding polycarbonate resin pellets, especially for optical molding materials. Examples of the shape of the pellet include a columnar shape, a spherical shape, a rectangular shape, and a cocoon shape, and a cylindrical shape having a particle size of 2.0 to 3.3 mm and a length of 2.5 to 3.5 mm. Is appropriate.

Conventionally, as described above, during the transportation of the optical polycarbonate resin pellets, it is inevitable that the pellets collide with each other due to the vibration of the transportation and generate fine powder. If this fine powder is present in an optical polycarbonate resin pellet to be molded in a certain amount or more, the optical disk molded from the pellet will have various defects as a recording material due to generation of silver and generation of carbide. On the other hand, the container of the present invention, even when transporting the polycarbonate resin pellets for a long time (especially by sea),
There is an advantage that generation of fine powder can be suppressed as much as possible.

The above polycarbonate resin is usually produced by reacting a dihydric phenol with a carbonate precursor in a solvent (interfacial polymerization method) or in a molten state (melt polymerization method). Basic means of these manufacturing methods will be briefly described.

In the case of an interfacial polymerization method using, for example, phosgene as a carbonate precursor, the reaction is usually carried out in the presence of an acid binder and a solvent. Examples of the acid binder include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide and amine compounds such as pyridine. As the solvent, for example, halogenated hydrocarbons such as methylene chloride and chlorobenzene are used. For promoting the reaction, a catalyst such as a tertiary amine or a quaternary ammonium salt may be used. At that time, the reaction temperature is usually 0 to 4
0 ° C. and the reaction time is a few minutes to 5 hours.

In the melt polymerization method (ester exchange reaction) using a carbonic acid diester as a carbonate precursor, a predetermined ratio of a dihydric phenol component is stirred with a carbonic acid diester while heating under an inert gas atmosphere to distill off the formed phenols. It is done by the method of letting out. The reaction temperature depends on the boiling point of the phenols formed, etc.
It is in the range of 00 ° C. The reaction is completed at a reduced pressure from the beginning while distilling off phenols produced. Further, a catalyst usually used in a transesterification reaction to promote the reaction can be used. Examples of the carbonic acid diester used in the transesterification reaction include diphenyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate and the like. Of these, diphenyl carbonate is particularly preferred.

A typical example of the above dihydric phenol is 2,2-bis (4-hydroxyphenyl) propane.
[Bisphenol A], bis (4-hydroxyphenyl)
Methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2- (4-hydroxy-3-
Methylphenyl) propane, bis (4-hydroxyphenyl) sulfone and the like. Preferred dihydric phenols are bis (4-hydroxyphenyl) alkanes, especially bisphenol A.

In producing the polycarbonate resin, the above dihydric phenols can be used alone or in combination of two or more. In addition, a suitable molecular weight regulator, a branching agent, a catalyst for accelerating the reaction, and the like can be used. Two or more of the polycarbonate resins thus obtained may be mixed.

The polycarbonate resin preferably has a viscosity average molecular weight of 10,000 to 22,000, and
2,000 to 20,000 are more preferable, and 13,000
0 to 18,000 is particularly preferred. A polycarbonate resin having such a viscosity average molecular weight is preferable because sufficient strength is obtained as an optical material, particularly a material for an optical disk, and the melt fluidity during molding is good and molding distortion is not generated.

[0038]

Examples 1 and 2 Columnar polycarbonate resin pellets having a particle size of 2.93 mm and a length of 3.0 mm synthesized by an interfacial polymerization method (Example 1) and a melt polymerization method (Example 2) were obtained as shown in FIG. It was filled in the tank of a tank type container for polycarbonate resin pellets, and transported by sea for 30 hours. At the transport destination, the polycarbonate resin pellets in the tank were discharged and the amount of the fine powder was observed.
It was less than 00 ppm. (Comparative Example 1) The polycarbonate resin pellets of Example 1 were filled in a tank of a tank truck of FIG.
Time land transportation. When the polycarbonate resin pellets in the tank were discharged at the destination and the amount of the fine powder was observed,
Fine powder of 1 mm or less was 600 ppm or more.

[0039]

As described above, according to the first aspect of the present invention, (1) The drum-type tank body 3 having a trunk length and in a lying posture and the rectangular box-shaped container frame 5 surrounding the tank body 3 are provided. The tank type container 1 for polycarbonate resin pellets is constituted, and a lock fitting 6 which can be engaged with a lock mechanism provided on a loading platform such as a trailer is provided at the lower end of the container frame 5, so that a large capacity is provided. Can be used for both land transportation by trailer and sea transportation by container ship, and the transportation efficiency is improved.

(2) The tank body 3 has an inlet pipe 20 at the front upper end in the length direction and a discharge pipe 21 at the rear lower end, and an air supply device for supplying compressed air into the tank body 3. The tank body 3, the inlet pipe 20, the discharge pipe 21, and the air supply device are surrounded by the container frame 5 without protruding from the container frame 5, so that the polycarbonate resin pellets can be efficiently out of the tank body. While having the function of discharging, it can be applied to both land and sea transportation as described above, and it is easy to handle,
In addition, it can be protected from damage due to collision with the outside during handling.

(3) Since the charging pipe 20 is disposed at the front upper end and the discharge pipe 21 is disposed at the rear lower end, when the tank body 3 is in a dumping state with the front rising, the charging pipe 20 is positioned at the uppermost end. And the discharge pipe 21 is located at the lowermost end, so that the tank can be filled completely and efficiently at the time of charging, and can be smoothly discharged at the time of discharging.

(4) Since the input pipe 20 is directed upward and forward and the discharge pipe 21 is directed upward and backward, the tank body 3
When the is set in the forward rising dump state, the input pipe 20 is directed upward, and the discharge pipe 21 is directed substantially horizontally rearward. Connection work to the pellet supply hopper or the receiving hopper at the time of discharge is facilitated.

(5) As in the second aspect of the present invention, when the compressed air jet pipes 27 and 28 are provided at the front upper end and the rear lower end of the tank body 3, respectively, the tank body 3 having a large capacity can be used. Regardless, the polycarbonate resin pellets can be discharged quickly and without waste.

(6) Since the container of the present invention can supply compressed air into the tank main body, even when the polycarbonate resin pellets for optical use are transported for a long time, the vibration of the pellets is suppressed by the pressure of the compressed air. The generation of fine powder can be prevented. That is, CD, CD-RO
M, CD-R, MO, PD, DVD, DVD-ROM,
It is suitable for transporting optical polycarbonate resin pellets used for DVD-R, DVD-RAM and the like.

[Brief description of the drawings]

FIG. 1 is a side view of a tank-type container and a trailer for polycarbonate resin pellets to which the present invention is applied.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a side view of a tank type container for polycarbonate resin pellets and a trailer shown in a dump state.

FIG. 4 is a view taken in the direction of the arrow IV in FIG. 1;

FIG. 5 is a longitudinal sectional view of a lock fitting.

FIG. 6 is a horizontal sectional view of a lock fitting.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 1;

FIG. 8 is an enlarged vertical sectional view of a discharge hopper.

FIG. 9 is a front view of a conventional container.

FIG. 10 is a side view of a conventional tank truck for polycarbonate resin pellets.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tank-type container 2 trailer 3 tank body 4 carrier 5 container frame 6 lock fitting 7 lock claw (lock mechanism) 16 long hole 20 input pipe 21 discharge pipe 27,28 air ejection pipe 29 air blowing pipe 30,31 air pressure feeding pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kohei Ogawa 3-39-3, Mikuni Honcho, Yodogawa-ku, Osaka-shi, Osaka Japan Aluminum Co., Ltd. (72) Inventor Akira Kazamoto 1-2-2, Uchisaiwaicho, Chiyoda-ku, Tokyo No. 2 Teijin Chemicals Co., Ltd. F-term (reference) 3E070 AA07 AA25 AB15 FA05 GA02 GA11 QA01 QA03 WJ04 WJ06 WJ07 WJ10

Claims (3)

[Claims] 1. A drum-shaped tank body having a trunk length and a lying posture, and a rectangular box-shaped container frame surrounding the tank body. The tank body has a charging pipe at a front upper end in a length direction and a rear lower end. The tank body, the input pipe, the discharge pipe and the air supply device are provided with an air supply device for supplying compressed air into the tank body.
It is stored in a space surrounded by a container frame, and a lock fitting is provided at the lower end of the container frame that can be engaged with a lock mechanism provided on a loading platform such as a trailer. The pipe protrudes rearward and upward, and when the tank body is tilted forward,
A tank-type container for polycarbonate resin pellets, characterized in that an inlet pipe faces upward and a discharge pipe faces substantially horizontally rearward. 2. An air supply device comprising: an air ejection pipe provided at a front upper end and a rear lower end of a tank main body; and an air blowing pipe connected to a compressed air supply source disposed at a rear side of the tank main body. 2. A tank type container for polycarbonate resin pellets according to claim 1, wherein air pressure feed pipes branching from the blow-in pipes and reaching the respective air ejection pipes are arranged along the surface of the tank body. 3. A transportation method using a tank type container for polycarbonate resin pellets according to claim 1.