JP2000225640A - Biaxial extruder equipped with barrel having bisected zone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biaxial extruder equipped with a bisectable barrel which is applicable to use the observation of a polymer in the course of processing in the extruder, allows observation to confirm whether a screw constitution is suitable for processing a polymer, and also allows an easy cleaning after the processing. SOLUTION: This biaxial extruder has a structure comprising a normal barrel zone I which is not bisectable, and a barrel zone II which is located at the downstream of the zone I and has a mechanism for opening/closing the zone II and bisecting it into an upper part and a bottom part. The upper bisected barrel 16a in the bisectable barrel can be opened/closed with handles 6a and 6b by virtue of the tensile strength of spring coils 12a and 12b in the rewinding direction of the coils which are jointed to the barrel 16a each at an end. The bottom bisected barrel 16b can be opened/closed with a handle through a linking mechanism jointed to the bottom bisected barrel 16b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-screw extruder with a two-piece barrel, which is used in a production process and an experimental study of a polymer material.

[0002]

2. Description of the Related Art A conventional two-piece barrel twin-screw extruder has a structure in which the entire area of the barrel is divided into two parts, and upper and lower barrels are simultaneously opened and closed, and only an upper half barrel is opened and closed. There is something. Further, as a mechanism for opening and closing the two-piece barrel, there are a mechanism for opening and closing the barrel with an electric or manual hydraulic pump, and a mechanism for simply opening and closing the barrel manually.

[0003]

A conventional two-piece barrel twin-screw extruder is used for kneading, melting, mixing and dispersing a polymer, or for producing a thermosetting resin or the like. It is mostly used to check the degree of structural change and the adequacy of the screw configuration for these operations, and to facilitate cleaning inside the barrel after production.

However, with regard to the structure in which the upper and lower barrels are simultaneously opened and closed, when the barrel is opened, the state of the unmelted solid polymer material, for example, pellets or powder, in the solid transport zone collapses and falls from the screw flow path. As a result, there is a problem that the state of the solid transport portion cannot be visually observed accurately.

[0005] In addition, for a structure in which only the upper half barrel is opened and closed, it is easy to sample the open upper half region in order to confirm the degree of mixing, composition, and structural change of the molten polymer in the screw flow path. However, sampling in the lower half area where the barrel cannot be opened requires sampling around the screw halfway or extracting it, which makes sampling difficult or inaccurate in sampling or that the screw must be extracted after production. For example, there is a problem that the barrel cannot be cleaned. In addition, such a model generally has a relatively short screw length and a short residence time of the molten resin, and thus cannot be often applied to operations such as devolatilization and extrusion accompanied by a reaction.

The present invention has been made in order to solve the above problems, and can be applied to observation of a polymer processing state in an extruder, and it is possible to observe the validity of a screw configuration for processing a polymer, and An object of the present invention is to provide a twin-screw extruder with a two-piece barrel that is easy to clean after polymer processing.

[0007]

The present invention has solved the above-mentioned problems as follows. That is, the twin-screw extruder has a structure including a normal barrel region that is not divided into two, and an upper and lower two-part barrel region having an opening / closing mechanism connected to the downstream side. By the opening / closing mechanism, the upper half barrel of the upper and lower split barrel region can be opened and closed by a handle using a pulling force in a rewinding direction of a coil spring having one end connected to the barrel. It can be opened and closed by a handle via a link mechanism connected to the lower half barrel.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a top view of a twin-screw extruder with a partial area two-piece barrel according to the present invention. As shown in the figure,
The barrel of the twin-screw extruder is a conventional undivided barrel region I
And a two-part barrel region II up to a die 9 downstream thereof.

The upper half barrel 1 of the two-piece barrel region II
6a is a shaft 1 fixed to supports 10a, 10b via upper half barrel brackets 13a, 13b.
The lower half barrel 16b is rotatably mounted on the shaft 15 via lower half barrel brackets 14a, 14b.

FIGS. 2 to 4 show an opening and closing mechanism for the upper and lower split barrels. FIG. 2 is a sectional view taken along the line AA of FIG. As shown in the figure, a pair of coil springs 12a (1
2b) is connected to one arm 12aa (12ba) of the coil spring 12a (12b).
bb) is installed on the support 10a (10b). The pulling force of the coil spring 12a (12b) for winding and unwinding is adjusted by the fine adjustment mechanism 11a (11
Fine adjustment is possible in b).

When the upper half barrel 16a is closed, the unwinding force of the coil spring 12a (12b) is adjusted so that the upper half barrel 16a is slightly larger than the gravity of the center of gravity of the upper half barrel. In the state of standing vertically, the upper half barrel 16
In the fully opened state where a is stopped by the stop pins 26a (26b) (see FIG. 4) mounted on the support 10a (10b) of the shaft 15, the adjustment is made so as to disappear.

A pair of handles 6a (6b) are mounted on the outer peripheral side of the upper half barrel 16a in the rotating direction so that the opening and closing of the upper half barrel 16a can be manually operated.

FIG. 3 is a sectional view taken along line BB of FIG. As shown in the drawing, one end of a power transmission link 17 is movably connected to a fixed ring nut 7 mounted on a lower half barrel 16b, and the other end of the link 17 is mounted on a threaded shaft 19. Movably connected to the ring nut 18. By turning the handle 20 attached to one end of the threaded shaft 19 in the forward and reverse directions, the ring nut 18 moves forward and backward, and the link 17
, The lower half barrel 16b is opened and closed.

The upper and lower half barrels 16a, 16b
Is closed, the female spigot 23b provided at the upstream end thereof and the male spigot 23a provided at the downstream end of the connection barrel 2 in the extruder upstream region are brought into close contact with each other, and the bolts 4 which can be easily attached and detached are used to move up and down. The half barrels 16a and 16b are connected and fixed.

The upper and lower half barrels 16a, 16
6b is connected to and fixed to the connection barrel 2 in the upstream region by bolts 5 which are easily detachable when the above-mentioned various polymer processing is performed.

FIG. 4 is a sectional view taken along line CC of FIG. As shown in the figure, the tip flange 8 provided on the downstream side of the upper and lower half barrels 16a and 16b is fixed to the lower half barrel 16b when the lower half barrel 16b opens and closes. Accompanying the opening and closing of the lower half barrel 16b,
When the upper and lower half barrels 16a and 16b are closed, they are fixed to the upper half barrel 16a with bolts 25.

The upper and lower half barrels 16a, 16b
Is closed, the female spigot 24b provided at the upstream end thereof and the male spigot 24a provided at the downstream end of the tip flange 8 are brought into close contact with each other.

[0019]

EXAMPLE As shown in FIG. 1, an extruder equipped with a partial-area two-piece barrel equipped with a screw having a diameter D = 30 mm and a total length of 45D was prepared. The extruder has a unit block length of 3.5
D barrels 13 are assembled, and the die 9 on the downstream side
The area of the 6-unit barrel up to the tip flange 8 to which is attached is a vertically divided structure. The upper and lower half barrels 16a and 16b are fastened together with the distal end flange 8 and the die 9 by two long bolts 21a and 21b (see FIGS. 1 and 4), respectively, to be integrated.

The upper half barrel 16a is opened and closed by the handle 6
Since the upper half barrel 16a can be opened and closed with a little force by grasping the a and 6b, there is no danger that the upper half barrel 16a will fall down and a hand will be pinched, and it is extremely safe. Opening and closing of the lower half barrel 16b is performed by hand using the handle 20.
Can be operated quickly and lightly, and can be stopped at any angle up to the full open range. Due to such convenience of opening and closing the upper and lower half barrels 16a and 16b,
It was confirmed that sampling to consider the state of polymer processing was easy.

Further, while the PP pellets are fed from the ordinary barrel 1 and kneading is performed in the two-piece barrel region II, the rotation of the screw 22 is stopped, and the upper half barrel 1 is rotated.
When 6a was opened, the filling length of the fixed transport zone and the degree of melting of the PP pellets due to the screw shape of the kneading zone could be intuitively considered. Further, when opening the lower half-split barrel 16b, the melted PP resin in the kneading zone can be easily completely removed from the whole, and the percentage of unmelted PP pellets can be measured from the sliced sample. Was. In addition, the inner wall surfaces of the upper and lower barrels can be easily cleaned, and the screw element can be easily replaced without removing the screw 22.

A first kneading zone is provided in a normal barrel region I upstream of the extruder, and a second kneading zone is provided in a two-piece barrel region II.
A kneading zone is provided, a feed port 3b provided in the connection barrel 2 is used as an open vent, and PP and TALC are supplied to a feed port 3a provided on the downstream side of the ordinary barrel 1, and P
Mixing and kneading of P and TALC were performed. In this case, the upper half barrel 16a was opened, and the state of dispersion and kneading of TALC in PP at the entrance and exit of the second kneading zone was visually observed, and the kneading condition due to the screw configuration of the kneading zone could be confirmed.

[0023]

The twin-screw extruder with a partial-area two-piece barrel according to the present invention has the following effects because it is configured as described above. 1. The two-piece barrel region can be applied for purposes such as kneading, melting, mixing and dispersing polymers, blending and producing thermoset polymers, and experimental studies. 2. When the screw length is insufficient for the above operation 1 or when the screw length is required for performing the reaction or devolatilization, the two-part barrel region and the normal barrel region on the upstream side are combined. Can be used. 3. The degree of polymer processing in the two-part barrel region can be visually observed by stopping the screw rotation and opening the upper half-part barrel. 4. The adequacy of the screw configuration used for polymer processing in the two-piece barrel region can be confirmed visually. 5. Opening the upper and lower half barrels in the two-piece barrel region facilitates melting at each position in the screw axis direction and sampling of the semi-molten resin. 6. After production or experiment in the two-part barrel area,
The screw and barrel can be easily cleaned without pulling out the screw.

[Brief description of the drawings]

FIG. 1 is a top view of a twin-screw extruder with a partial area two-piece barrel according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1, showing an opening and closing mechanism of an upper and lower split barrel.

FIG. 3 is a sectional view taken along the line BB of FIG. 1 and shows an opening and closing mechanism of an upper and lower split barrel.

FIG. 4 is a cross-sectional view taken along the line CC of FIG. 1, wherein (a) is an opening / closing mechanism of an upper and lower split barrel, and (b) is a top view of a main part thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Normal barrel 2 Connection barrel 3a, 3b Feed port 4 Bolt (for closing the split barrel) 5 Bolt (for barrel connection) 6a, 6b Handle 7 Fixing ring nut 8 Tip flange 9 Dies 10a, 10b Support 11a, 11b Fine Adjusting mechanism 12a, 12b Coil spring 12aa, 12ab One arm of coil spring 12ba, 12bb One arm of coil spring 13a, 13b Bracket for upper half barrel 14a, 14b Bracket for lower half barrel 15 Shaft 16a Upper half barrel 16b Lower half Barrel 17 Link 18 Ring nut 19 Threaded shaft 20 Handle 21a, 21b Long bolt 22 Screw 23a Male spigot (connection barrel) 23b Female spigot (upstream of upper and lower split barrel) 24a Male spigot (tip franc) ) 24b Mesuinro (downstream side of the upper and lower split barrel) 25 volts 26a, 26b stop pin I normal barrel zone II bisected barrel region

Claims (3)

[Claims] 1. An ordinary barrel region (I) which is not divided into two parts
A twin-screw extruder with a partial-area two-piece barrel, comprising: an upper and lower two-piece barrel area (II) having an opening and closing mechanism connected to a downstream side thereof. 2. One arm (12aa) of a coil spring (12a, 12b) mounted on a shaft (15) that is a rotation axis of the upper half barrel (16a) of the upper and lower split barrel region (II). , 12ba) and the other arm (12ab, 12bb) is connected to the shaft (1
5) is mounted on the support (10a, 10b), and the upper half barrel (16a) is provided with the coil spring (1).
2a, 12b) with the unwinding tensile force resisting the gravity of the barrel center of gravity, the upper half barrel (16
2. The twin-screw extruder according to claim 1, further comprising a handle (6a, 6b) for opening and closing a). 3. The lower half barrel (16b) of the upper and lower split barrel region (II) is mounted on a shaft (15) that is a rotation axis of the lower half barrel (16b), and power is transmitted to the lower half barrel (16b). One end of a link (17) is movably connected, and the other end of the link (17) is movably connected to a ring nut (18) mounted on a threaded shaft (19). In (19), the ring nut (18) is moved back and forth, and the lower half barrel (16b) is moved.
3. A twin-screw extruder with a partial-area two-piece barrel according to claim 1, further comprising a handle (20) for opening and closing the barrel.