JPH06198707A - Movable type outer deckle - Google Patents

Abstract

PURPOSE:To change the discharge width of the opening part of a slit without stopping operation of an extruder and to prevent leak of molten resin by providing regulation means which uniformly regulate pressing force for a deckle seal bar in the respective pressing parts provided in the sliding direction of the deckle seal bar. CONSTITUTION:A plurality of pieces of hydraulic diaphragms 30 being a pressing part are provided in the sliding direction X-X' of a deckle seal bar 5 in the equal intervals. On the other hand, a hydraulic passage 39 communicated with hydraulic holes 35 is provided in the top of a deckle holder 6. The hydraulic passage 39 is connected to an oil unit equipped with an oil tank, a hydraulic pump and a directional control valve or the like. The pressing force of the respective hydraulic diaphragms 30 is allowed to uniformly act on the deckle seal bar 5 at proper valve and accurately reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable outer deckle used for forming a sheet or a film (hereinafter collectively referred to as "sheet-like material") by a T-die method, and more specifically to a movable outer deckle. In order to control the width of the sheet material by blocking the upper and lower lips of the die and the widthwise sides of the slit opening formed between the die side plates on both sides, changing the discharge width of the molten resin. Regarding the movable outer deckle used.

[0002]

2. Description of the Related Art Generally, in forming a sheet-like material based on the T-die method, there are two types of deckle devices, an inner deckle type and an outer deckle type, for controlling the original width of the sheet-like material by changing the discharge width of the molten resin. There is.

The inner deckle type is constructed so that rod-shaped obstacles are provided inside the molten resin flow path of the die body to limit the flow of the molten resin at both ends of the die.

On the other hand, the outer deckle is a type that blocks the discharge portion of the slit opening of the die, and the outer deckle includes a fixed deckle and a movable deckle.

In the fixed deckle, before operation of the extruder, the deckle seal bar is slid to adjust the discharge width of the slit opening of the die in advance and then position the deckle. This model does not move the bar.

In the movable deckle, the deckle seal bar is slid without stopping the operation of the extruder,
This is a type that allows the discharge width of the slit opening to be freely adjusted.

14 to 16 show a movable outer deckle which is generally used in the past. FIG. 14 is a front view, and FIGS. 15 and 16 are FF line and G line in FIG.
It is a -G line sectional view.

The movable outer deckle shown in these figures has a die upper lip 1, a die lower lip 2, die side plates 3 on both sides, a slit opening 4 formed surrounded by these members, and Deckel seal bars 5 arranged on both sides of the slit opening 4 in the width direction, a deckle holder 6, a deckle receiving plate 7 attached to the outer side of each die side plate 3, and a further outer side of each deckle receiving plate 7. Deckle side plate 8 attached to the die, upper and lower lip 1,
The slide feed shaft 9 installed on one of the two (in the example shown in the figure, the die upper lip 1 side) and the other of the die and the lower lips 1, 2 (in the example shown the die upper lip 2 side). The slide guide shaft 10 and the pressing means 12 for the deckle seal bar 5 are provided.

Each deckle seal bar 5 has a U-shaped seal between the end faces of the die upper and lower lips 1 and 2 and the end face of the die side plate 3 at both widthwise ends of the slit opening 4. To form a surface. Since each slide feed shaft 9 is formed in the deckle holder 6, it is fitted with a screw, and is rotatably supported by the deckle side plate 8 and the bearing 11, and the slide feed shaft 9 is rotated in the forward direction or the reverse direction. By doing so, the deckle holder 6 can be slid in a direction toward or away from the center of the slit opening 4 in the width direction.

Each slide guide shaft 10 is inserted into a lateral hole provided inside the deckle holder 6 and is fixed between the deckle side plate 8 and the bearing 11, and when the deckle holder 6 is slid, the deckle holder 6 is slidable. It is designed to guide 6 in parallel. The pressing means 12 is provided on the deckle holder 6, and after adjusting the setting positions of the deckle seal bar 5 and the deckle holder 6, the deckle seal bar 5 is placed on the die.
The deckle seal bar 5 is fixed by pressing on the end faces of the lower lips 1 and 2.

Next, FIG. 17 is a side view showing a sheet-shaped article forming apparatus based on the T-die method having the movable outer deckle.

In the apparatus for molding a sheet material shown in FIG. 17, a molten resin is extruded from an extruder 20, the molten resin passes through a manifold 22 formed inside a T die 21, and then the upper and lower dies. It is discharged from a slit opening 4 formed by being surrounded by the lips 1 and 2 and the die side plates 3 on both sides. At this time, the discharge width of the molten resin is regulated by the deckle seal bar 5. As described above, the molten resin 26 discharged with the discharge width regulated passes in an S-shape between the forming rolls 23, 24, 25 arranged in multiple stages, and in the meantime, a sheet shape having a predetermined thickness and width. The material 27 is molded while being cooled, and then wound up or stacked with sheets through various downstream post-processing devices (not shown).

Next, FIG. 18 is an enlarged front view showing a conventional pressing means of the deckle seal bar, FIG. 19 and FIG.
Reference numeral 0 is a sectional view taken along line HH and line II of FIG.

By the way, in the conventional pressing means 12 for the deckle seal bar 5, the deckle holder 6 has
A plurality of screw holes 13 are provided at intervals in the width direction of the slit opening 4. A push bolt 14 is screwed into each of the screw holes 13 from the front end surface of the deckle holder 6. Further, on the front end face side of the deckle seal bar 5, bolt receiving holes 15 having the same pitch as the screw holes 13 are provided. It should be noted that the tip portion 5 ′ of the deckle seal bar 5 toward the center of the slit opening 4 is formed in an edge shape.

When changing the discharge width of the molten resin in the pressing means 12, the pressing bolt 14 is screwed into the screw hole 1
Loosen or remove from 3 and slide the deckle seal bar 5 to any position. Then, the slide guide shaft 10 is rotated to move the deckle seal bar 5
Move the deckle holder 6 in the direction of sliding, align the screw holes 13 of the deckle holder 6 with the bolt receiving holes 15 of the deckle seal bar 5, and then screw the push bolts 14 into each screw hole 13 The tips of the bolts 14 are inserted into the bolt receiving holes 15, and the pusher bolts 14 press the deckle seal bar 5 against the end surfaces of the upper and lower lips 1 and 2 of the die to fix them.

Next, FIG. 21 is an enlarged vertical sectional view showing another embodiment of the deckle seal bar. In the deckle seal bar 5 shown in FIG. 21, the deckle seal bar main body 16
The reinforcing plate 17 is integrally attached to the front end face side of the. The reinforcing plate 17 is provided with a bolt receiving hole 15. Other configurations of the deckle seal bar 5 are the same as those shown in FIGS. 18 to 20.

Further, FIG. 22 is an explanatory view of a step formed between the die upper and lower lips and the die side plate forming a U-shaped sealing surface with the deckle seal bar.

By the way, the deckle seal bar 5 can be manufactured flat and straight, but as shown in FIG. 22, a step δ ₁ is formed between the side surface of the die upper lip 1 and the side surface of the die lower lip 2. Easy to attach, die upper and lower lip 1,
A step δ ₂ is likely to be formed between the end face of 2 and the front end face of the die side plate 3.

These steps δ ₁ and δ ₂ are 1/100 mm
Controlling to a certain degree requires advanced manufacturing and processing technology and skilled assembly work. Therefore, generally 2/100 to 3 /
It is common for a step of 100 mm to occur.

As a technique related to this type of deckle device, Japanese Patent Laid-Open No. 51-2768 and Japanese Utility Model Laid-Open No. 62-
There are techniques described in Japanese Patent No. 116821 and Japanese Utility Model Laid-Open No. 3-114322.

[0021]

By the way, in order to prevent damage to the end faces of the upper and lower lips of the die regardless of whether the outer deckle is fixed or movable, the deckle seal bar 5 is made of a soft material such as copper or aluminum. It is formed by.

On the other hand, in the conventional pressing means 12 for the deckle seal bar 5, as described above, the plurality of pressing bolts 14 are screwed in and pressed against the end surfaces of the upper and lower lips 1 and 2 of the die. Therefore, there is a problem that the push bolt 14 is loosened during the molding of the sheet-like material and the molten resin leaks from the sealing surface.

Further, it is very difficult to adjust each pressing bolt 14 to a uniform pressing force, and since the pressing force is non-uniform, the deckle seal bar 5 is flexibly deformed, which causes a problem that molten resin leaks. is there. Further, when the push bolt 14 is strongly tightened, the deckle seal bar 5 is deformed, and it becomes difficult to adjust the slide of the deckle seal bar 5.

Moreover, it is almost impossible to reproduce the pressing force of the push bolt 14 to an appropriate value, and even if it is tightened with a torque wrench, the above-mentioned looseness and the end surfaces of the upper and lower lips 1 and 2 of the die are not removed. There is also a problem that it is not possible to eliminate the variation in pressing force due to flatness.

Further, as described above, the deckle seal bar 5
In the die upper and lower lips 1 and 2 and the die side plate 3 that form a U-shaped sealing surface between and, a step δ ₁ is easily formed between the side surfaces of the die upper and lower lips 1 and 2. There is a step δ ₂ between the end faces of the lips 1 and 2 and the front end face of the die side plate 3.
Is easily attached (see FIG. 22). These steps δ ₁ , δ ₂
There is also a problem that the molten resin leaks from the gap generated by the above.

Furthermore, when the discharge width of the slit opening 4 is adjusted without stopping the extruder, the edge-shaped tip 5'of the deckle seal bar 5 comes into contact with the discharged molten resin 26, and the tip is Molten resin adheres to the portion 5 '. Therefore, when the deckle seal bar 5 is slid, the molten resin adhering to the tip portion 5'of the deckle seal bar 5 is dragged, which causes the die upper and lower lips 1,
The end surface of No. 2 is soiled, which induces a so-called die line, which appears as a streak-like defect on the surface of the sheet-like material 27,
There is also a problem that the product yield decreases.

The object of the present invention is to change the discharge width of the slit opening without stopping the operation of the extruder, and to loosen the push bolt during the operation of the extruder, to make the pressing force non-uniform and excessive. It is possible to prevent leakage of molten resin due to deformation of the deckle seal bar due to a strong pressing force,
Furthermore, the object is to provide a movable outer deckle that can be easily reproduced with an appropriate pressing force, and has a compact pressing portion with excellent operability and workability.

Another object of the present invention is from the clearance generated by the deckle seal bar, the step between the side faces of the die and the lower lip, and the step between the end faces of the die and the lower lip and the front end face of the die side plate. Another object of the present invention is to provide a movable outer deckle capable of preventing the leakage of the molten resin.

Further, another object of the present invention is to provide a movable outer deckle which can solve the problem that the die line is induced by the adhesion of the molten resin to the edge-shaped tip of the deckle seal bar and the product yield is reduced. To provide.

[0030]

In order to achieve the above object, according to the present invention, pressing parts are provided at a plurality of positions in the sliding direction of the deckle seal bar, and each pressing part is provided with:
Adjustment means for uniformly adjusting the pressing force against the deckle seal bar is provided.

In order to achieve the above object, in the present invention, hydraulic diaphragms are installed at a plurality of positions in the deckle seal bar in the sliding direction, and the pressing force of the plurality of hydraulic diaphragms against the deckle seal bar is controlled uniformly. It is connected to the hydraulic unit.

Further, in order to achieve the above object, in the present invention, disc springs are installed at a plurality of positions in the deckle seal bar in the sliding direction, and each disc spring is provided with an adjusting means for uniformly adjusting the pressing force against the deckle seal bar. It is provided.

In order to achieve the above object, in the present invention, the cooling means is provided at the position corresponding to the slit opening in the front end of the die side plate.

Further, in order to achieve the above object, in the present invention, cooling means is provided at the tip of the deckle seal bar.

Further, in order to achieve the above object, in the present invention, the cooling means is provided at the position corresponding to the slit opening in the front end portion of the die side plate, and the cooling means is provided at the tip end portion of the deckle seal bar. .

[0036]

According to the present invention, the pressing portions are provided at a plurality of positions in the sliding direction of the deckle seal bar, and the pressing force to the deckle seal bar is adjusted uniformly by adjusting means. Therefore,
The deckle seal bar can be slid to change the discharge width of the slit opening without stopping the operation of the extruder.

Further, it is possible to eliminate loosening during operation of the extruder, uneven pressing force, and deformation of the deckle seal bar due to excessive pressing force, which are difficult to avoid by the push bolt method. It is possible to prevent the molten resin from leaking. Furthermore, in addition to being able to easily reproduce the appropriate pressing force, it is compact and easy to operate.
Since it has excellent workability, it can be used in a narrow space between the forming roll and the T-die.

Further, in the present invention, the hydraulic diaphragms are installed at a plurality of positions in the sliding direction of the deckle seal bar, and the hydraulic unit uniformly controls the pressing force of the hydraulic diaphragms against the deckle seal bar. . As a result, according to the present invention, the discharge width of the slit opening can be changed without stopping the operation of the extruder, and the loosening of the push bolt during the operation of the extruder, the uneven pressing force, and the excessive pressing force. The molten resin can be prevented from leaking due to the deformation of the deckle seal bar due to the pressing force, the proper pressing force can be easily reproduced, the pressing portion can be made compact, and the operability and workability can be improved. In addition to the above, the hydraulic diaphragm can be remotely operated by a hydraulic unit.

In particular, the hydraulic diaphragm used in the present invention has a cylindrical shape and is deeply fold-folded in multiple stages in the length direction, and has a very large pressure resistance and elasticity and is compact. Therefore, according to the present invention, since a small size and a large degree of freedom of the pressing force can be obtained, a more appropriate pressing force can be given even when the deckle seal bar is slid and when the deckle seal bar is pressed. .

Furthermore, in the present invention, disc springs are installed at a plurality of positions in the sliding direction of the deckle seal bar, and the disc springs are adjusted uniformly by the adjusting means against the deckle seal bar. as a result,
Also in the present invention, the discharge width of the slit opening can be changed without stopping the operation of the extruder, and due to the looseness of the push bolt during the operation of the extruder, the uneven pressing force, and the excessive pressing force. It is possible to prevent the molten resin from leaking due to the deformation of the deckle seal bar, to easily reproduce an appropriate pressing force, to make the pressing portion compact, and to improve the operability and workability.

In particular, the disc spring used in the present invention has a small spring diameter and a high spring constant as compared with an ordinary compression coil spring, and the spring constant can be adjusted by changing the number of layers and stacking the spring constant. Elasticity is stable. Therefore, according to the present invention, the pressing force of the deckle seal bar can be easily adjusted to an appropriate value.

In the present invention, cooling means is provided at a position corresponding to the slit opening in the front end portion of the die side plate,
This cooling means cools the front end of the die side plate.

As a result, the molten resin around the front end portion of the die side plate is cooled, the viscosity is increased, and the fluidity is decreased. Thus, with respect to the step between the deckle seal bar and the side surfaces of the die and the lower lip, and the step between the end surface of the die and the lower lip and the front end surface of the die side plate, 2/100 to 3/100.
After recognizing a step of about mm, it is possible to prevent the molten resin from leaking from the gap generated between the deckle seal bar and the step due to the step. Further, in the present invention, since the front end of the die side plate is locally cooled,
The cooling means having a simple structure enables efficient cooling.

Further, in the present invention, the tip end portion of the deckle seal bar is provided with a cooling means, and the tip end portion of the deckle seal bar is cooled by the cooling means when the discharge width of the slit opening is changed.

As a result, it is possible to prevent the molten resin from adhering to the tip portion of the deckle seal bar and effectively suppress the reduction in product yield due to the die line. Moreover, in the present invention, the front end of the die side plate is locally cooled, so that the cooling can be efficiently performed with a simple structure.

Further, in the present invention, the cooling means is provided at the position corresponding to the slit opening in the front end portion of the die side plate, and the cooling means is provided at the tip end portion of the deckle seal bar. ， It is possible to prevent leakage of molten resin from the gap caused by the step between the side faces of the lower lip and the step between the end face of the lower lip and the front end face of the die side plate on the die, and the tip of the deckle seal bar. It is also possible to solve the problem that the product line is reduced by inducing a die line due to the adhesion of the molten resin to the product.

[0047]

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

First Embodiment: FIGS. 1 to 5 show a first embodiment of the present invention.
2 is a front view showing one of a deckle seal bar, a deckle holder, and a hydraulic diaphragm disposed on both sides of the slit opening in the width direction, and FIG. 3 is a sectional view taken along line AA and BB of FIG. 1, FIG. 4 is an enlarged vertical sectional view of the hydraulic diaphragm, and FIG. 5 is a view taken along the line CC of FIG.

In the first embodiment shown in these figures, FIG.
Also, as shown in FIG. 2, a plurality of hydraulic diaphragms 30 (three in the illustrated example), which are pressing portions, are installed at equal intervals in the sliding direction XX ′ of the deckle seal bar 5.

As can be seen from FIGS. 4 and 5, the hydraulic diaphragm 30 is formed in a cylindrical shape and is deeply folded in multiple stages in the longitudinal direction. Further, the hydraulic diaphragm 30 is housed in the outer tube 31, a diaphragm receiver 34 is arranged on one end side in the length direction of the hydraulic diaphragm 30, and a pusher 37 is arranged on the other end side. ing. A male thread 32 for attachment and a groove 33 for a tool are provided on the outer side of the outer tube 31.

The diaphragm receiver 34 is provided with a hydraulic hole 35 communicating with the hydraulic diaphragm 30 and an O-ring groove 36. Further, the diaphragm receiver 34 stores the hydraulic diaphragm 30 in the exterior pipe 31,
It is fixed to the outer tube 31 by welding or the like.

The pusher 37 is adapted to transmit the pressing force due to the expansion and contraction of the hydraulic diaphragm 30 to the deckle seal bar 5.

On the other hand, the top of the deckle holder 6 is shown in FIG.
As can be seen from FIG. 3 and FIG. 3, there are provided a female thread 38 that fits into the male thread 32 provided in the outer tube 31, and a hydraulic passage 39 that communicates with a hydraulic hole 35 provided in the diaphragm receiver 34. . The plurality of female threads 38 (three in the illustrated example) are provided in accordance with the arrangement pitch of the hydraulic diaphragms 30. An O-ring 40 is interposed between the inner surface of the top of the deckle holder 6 and the O-ring groove 36 provided in the diaphragm receiver 34. Further, the hydraulic passage 39 is connected to a hydraulic unit (not shown) including an oil tank, a hydraulic pump, a direction switching valve and the like.

By the way, the hydraulic diaphragm 30 and
Diaphragm receiver 34, pusher 37, exterior tube 3
To assemble 1 and 1, do the following:

First, the outer periphery of the joint between the hydraulic diaphragm 30 and the diaphragm receiver 34 and the outer periphery of the joint between the hydraulic diaphragm 30 and the pusher 37 are welded to each other so that the diaphragm receiver 34, the hydraulic diaphragm 30 and the pusher 37 are integrated. The structure. Next, the diaphragm receiver 34, the hydraulic diaphragm 30, and the pusher 37.
The integrated structure is inserted into the exterior pipe 31, and the outer periphery of the joint between the exterior pipe 31 and the diaphragm receiver 34 is welded and assembled.

Next, in order to assemble the assembly of the hydraulic diaphragm 30, the outer tube 31, the diaphragm receiver 34 and the pusher 37 between the deckle seal bar 5 and the deckle holder 6, the O-ring groove 36 provided in the diaphragm receiver 34 is installed. Attach the O-ring 40 to the outer tube 31
The male screw 32 provided on the screw is fitted to the screw 38 provided on the deckle holder 6. Further, the hydraulic passage 39 provided in the deckle holder 6 is connected to the hydraulic unit.

When the hydraulic diaphragm 30 is used,
Is controlled on the hydraulic unit side, the pressing force of each hydraulic diaphragm 30 against the deckle seal bar 5 can be uniformly applied to an appropriate value and can be accurately reproduced.

As described above, in this first embodiment, the pressing force of each hydraulic diaphragm 30 against the deckle seal bar 5 can be adjusted to an appropriate value and evenly. Therefore, when the discharge width of the slit opening 4 is changed, The deckle seal bar 5 can be slid without stopping the operation of the extruder, and can be slid smoothly without damaging the end faces of the dies and the lower lips 1 and 2 formed of a soft metal.

Further, according to the first embodiment, the deckle seal bar due to the looseness during operation of the extruder, the uneven pressing force, and the excessive pressing force, which are difficult to avoid by the push bolt method, are used. Since the deformation of No. 5 can be eliminated, it is possible to prevent the molten resin from leaking from the sealing surface due to these. Particularly, in the first embodiment, each hydraulic diaphragm 30 can be remotely operated by the hydraulic unit. Moreover, since the hydraulic diaphragm 30 used in the first embodiment is deeply folded in multiple stages, it has very high pressure resistance and stretchability and is compact. Therefore, since the size is small and the degree of freedom of the pressing force is large, the pressing force of the deckle seal bar 5 can be extremely appropriately adjusted as well as the pressing means of the deckle seal bar 5 can be made compact. When the seal bar 5 is slid, the pressing force is controlled weakly to reduce the frictional resistance between the end faces of the upper and lower lips 1 and 2 and the deckle seal bar 5, and then the deckle seal bar 5 may be slid. it can.

Other structures and operations of the first embodiment are similar to those of the technique shown in FIGS. 14 to 17.

Second Embodiment: Next, FIGS. 6 to 9 show a second embodiment of the present invention. FIG. 6 shows a deckle seal bar arranged on both sides of the slit opening in the width direction. A front view of the main part of one of the deck, deckle holder, and disc spring set, and FIGS. 7 and 8 show DD of FIG.
9 is an enlarged sectional view of the disc spring portion.

In the second embodiment shown in these figures, FIG.
Further, as shown in FIG. 7, a plurality of disc springs 41 (six in the illustrated example) are installed at equal intervals in the sliding direction XX ′ of the deckle seal bar 5. As shown in FIGS. 7 to 9, each disc spring 41 is housed in a spring housing hole 42 provided in the deckle seal bar 5 with a washer 43 interposed therebetween.

For each disc spring 41, in order to increase the displacement amount and reduce the spring constant to increase the adjustment operation margin of the pressing force, for example, those arranged in two to six stages in series are used.
Further, as shown in FIGS. 7 to 9, each disc spring 41 is provided with a pusher 44 and a push bolt 45.

The pusher 44 presses the disc spring 41.

The push-in bolt 45 is adapted to adjust the amount of displacement of the disc spring 41 via the pusher 44. The push bolt 45 is provided with a depth gauge hole 46 for measuring the disc spring displacement amount.

On the other hand, a female screw 47 for attaching the push-in bolt 45 is formed at the top of the deckle holder 6. Further, a disc spring displacement amount measurement reference surface 48 is set on the outer surface of the top of the deckle holder 6.

Then, in this second embodiment, the disc spring 41 is set in each spring accommodating hole 42 provided in the deckle seal bar 5 with the washer 43 interposed therebetween. Next, the pusher 44 is placed on the disc spring 41, and further pushed into the screw 47 because it is formed on the top of the deckle holder 6 and the bolt 4
5 is screwed in, and pusher 44 is pushed. At this time, a depth gauge (not shown) is inserted into the depth gauge hole 46 provided in the push-in bolt 45, and the disc spring displacement amount measurement reference surface 4 set on the outer surface of the top of the deckle holder 6 is inserted.
The displacement amount of the disc spring 41 from 8 is measured, and the absolute displacement amount of each disc spring 41 is adjusted to be constant. As a result, the pressing force of the deckle seal bar 5 against the end surfaces of the upper and lower lips 1 and 2 of the die can be uniformly adjusted to an appropriate value, and can be easily reproduced.

Therefore, also in the second embodiment, since the proper pressing force to the deckle seal bar 5 can be given, the discharge width of the slit opening 4 can be changed without stopping the operation of the extruder. You can
It is possible to prevent the molten resin from leaking due to uneven pressing force of the deckle seal bar 5 and deformation of the deckle seal bar 5 due to excessive pressing force.

In particular, the disc spring 41 used in the second embodiment is more compact than the ordinary compression coil spring, has a high elasticity, and is stable. As a result, according to this second embodiment, the deckle seal bar 5
It is possible to easily adjust the pressing force of to an appropriate value.

The other structure and operation of the second embodiment are the same as those of the first embodiment.

Third Embodiment: Next, FIG. 10 is a partially cutaway front view showing a third embodiment of the present invention, and FIG. 11 is a partially cutaway plan view of FIG.

In the third embodiment shown in FIGS. 10 and 11, the cooling means 49 is provided at the position corresponding to the slit opening 4 at the front end of the die side plate 3.

The cooling means 49 has a cooling pipe 50 and a refrigerant supply pipe 51. The cooling pipe 50
Is attached to the inside of the die side plate 3, and the other end is closed. Further, a cooling medium discharge pipe 52 is attached to the cooling pipe 50. One end of the coolant supply pipe 51 is inserted into the cooling pipe 50, and the other end is connected to a coolant supply source (not shown).

Air, cooling water, refrigerant oil or the like is used as the refrigerant.

In the third embodiment, the coolant is supplied to the inside of the cooling pipe 50 through the coolant supply pipe 51 and the portion corresponding to the slit opening 4 at the front end of the die side plate 3 is locally cooled by the coolant. To do. As a result, the viscosity of the molten resin near the portion of the die side plate 3 increases and the fluidity decreases. Thereby, the deckle seal bar 5 and the step δ ₁ between the side surfaces of the die and the lower lips 1 and 2 shown in FIG. 22 and the step between the end surfaces of the die and the lower lips 1 and 2 and the front end surface of the die side plate 3 are formed. It is possible to prevent leakage of the molten resin from the gap caused by δ ₂ .

That is, in the third embodiment, with respect to the steps δ ₁ and δ ₂ described above, a step of about 2/100 to 3/100 mm is recognized, and the slit opening 4 at the front end of the die side plate 3 is recognized. The position corresponding to is cooled, the molten resin in the vicinity of the gap is cooled to increase the viscosity, reduce the fluidity, and prevent leakage. Further, in the third embodiment, the front end of the die side plate 3 is locally cooled, so that it can be efficiently cooled by the cooling means having a simple structure.

Fourth Embodiment: Further, FIG. 12 is a front view of a main portion of a fourth embodiment of the present invention, and FIG. 13 is a partially cutaway plan view of FIG.

In the fourth embodiment shown in FIGS. 12 and 13, a cooling pipe 53, which is a cooling means, is inserted into the tip portion 5'of the deckle seal bar 5.

When the discharge width of the slit opening 4 is changed, a coolant such as cooling air, cooling water or coolant oil is supplied to the cooling pipe 53, and this coolant causes the tip portion 5'of the deckle seal bar 5 to be supplied. Is locally cooled to prevent the molten resin from adhering to the tip 5'of the deckle seal bar 5. As a result, the phenomenon of adhesion of the molten resin from the tip portion 5'of the deckle seal bar 5 to the upper and lower lips 1 and 2 of the die can be significantly reduced, so that the occurrence of die lines which are surface defects of the sheet-like material can be prevented. It becomes possible to do.

In particular, when the discharge width of the slit opening 4 is reduced, the action of preventing the molten resin from adhering to the end faces of the die, the lower lips 1 and 2 as described above, and the deckle seal bar 5 In combination with the scraping action of the resin adhered to the end faces of the lower lips 1 and 2 on the die by the edge-shaped tip portion 5 ', the generation of the die line can be prevented more effectively.

Other Embodiments: In the present invention, the pressing portion of the deckle seal bar 5 and the adjusting means for uniformly adjusting the pressing force are not limited to the structures shown in the first and second embodiments, and they are not limited to the desired ones. What has the function of is sufficient.

In addition, the above-mentioned movable outer deckle,
You may use together with a movable inner deckle.

Further, the cooling means 49 for the tip portion of the die side plate 3 and the cooling pipe 53 as the cooling means for the tip portion 5'of the deckle seal bar 5 may be used together. It is possible to provide an outer deckle that has both the action and effect of the cooling means.

A more specific embodiment of the present invention:
[Table 1] lists Examples 1, 2, and 3 as specific examples of the present invention. Embodiments 1 and 2 show cases in which the above-described first embodiment and the third and fourth embodiments are implemented in combination.

The third embodiment is the same as the second embodiment and the third embodiment.
The case where it is carried out in combination with the fourth embodiment is shown.

[0086]

[Table 1]

Comparative Example: (1) In Example 2 shown in Table 1 having the smallest lip step, the disk spring type deckle seal bar is removed and the prior art push bolt type deckle shown in FIGS. Replace with a seal bar and use a torque wrench to weigh about 55 kg.
Tighten so that a pressing force equivalent to f / piece (total 300 kgf) is generated, set the blocking width to 100 mm, and let the resin flow. At first, no resin leakage occurred, but when sliding the blocking width to 150 mm , The resin leaked from the sealing surface of the lip on the die. Once the operation was stopped, the deckle device was removed, the die and deckle seal bar were completely cleaned, the pushing force of the push bolt was increased to 65 kgf / piece (total 390 kgf), and the operation was restarted. Although it almost disappeared, it became difficult to slide the block width from 150 mm to 100 mm, and when the operation was continued at the position with the block width of 110 mm, the resin leak reappeared after about 15 minutes and the deckle seal bar was slid. It was completely impossible to let them do it.

(2) In Example 1 shown in Table 1 in which the difference in level between the upper and lower lips of the die is the largest, resin leakage occurs when cooling of the deckle seal bar is stopped, and the end faces of the upper and lower lips of the die are At the same time as it became dirty, it became difficult to adjust the slide of the deckle seal bar.

(3) In Example 2 shown in Table 1, when the cooling of the tip portion of the die side plate was stopped, resin leakage occurred from the tail portion of the deckle seal bar, making slide adjustment of the deckle seal bar difficult. It was

(4) In Example 3 shown in Table 1, the cooling of the tip portion of the deckle seal bar was stopped, the deckle seal bar was slid from the closed width of 150 mm to 100 mm, and the discharge width was widened. The resin adhering to the tip of the was dragged to stain the end surface of the lip on the die, and a die line was generated in the sheet-like product as a product.

[0091]

As described above, the present invention has the following effects.

Claim 1: Since the pressing parts are provided at a plurality of positions in the sliding direction of the deckle seal bar, and each pressing part is provided with an adjusting means for uniformly adjusting the pressing force to the end faces of the upper and lower lips of the die. There is an effect that the deckle seal bar can be slid and the discharge width of the slit opening can be changed without stopping the operation of the extruder.

Further, it is possible to eliminate the loosening during operation of the extruder, the uneven pressing force, and the deformation of the deckle seal bar due to the excessive pressing force, which are difficult to avoid by the push bolt method. There is also an effect of preventing the leakage of the molten resin that is generated. Furthermore, in addition to having the effect of being able to easily reproduce an appropriate pressing force, it is possible to achieve compactness and operability and workability. There is an effect that a narrow space between the forming roll and the tip of the T-die can be accommodated without increasing the distance.

Claim 2: Since the hydraulic diaphragms are installed at a plurality of positions in the sliding direction of the deckle seal bar, and the plurality of hydraulic diaphragms are connected to a hydraulic unit for uniformly controlling the pressing force against the deckle seal bar. The effect is that the discharge width of the slit opening can be changed without stopping the operation of the extruder, and the deckle seal bar due to loosening of the push bolt, uneven pressing force and excessive pressing force during the operation of the extruder. It has the effect of preventing leakage of molten resin due to deformation of the resin, can be easily reproduced with an appropriate pressing force, and has the effect of making the pressing part compact and improving operability and workability. Another advantage is that the hydraulic diaphragm can be remotely operated by the hydraulic unit.

Furthermore, the hydraulic diaphragm used in the present invention has a cylindrical shape and is deeply fold-folded in multiple stages in the length direction, and has very high pressure resistance and stretchability, and is therefore compact and has a high pressing force. Since the degree of freedom of strength can be increased, an even more appropriate pressing force can be exerted even when the deckle seal bar is slid and when the deckle seal bar is pressed.

Claim 3: Disc springs are installed at a plurality of positions in the deckle seal bar in the sliding direction, and each disc spring is
Since the adjusting means for uniformly adjusting the pressing force against the deckle seal bar is provided, there is an effect that the discharge width of the slit opening can be changed without stopping the operation of the extruder. It has the effect of preventing leakage of molten resin due to loosening of bolts, uneven pressing force and deformation of the deckle seal bar due to excessive pressing force, and it is possible to easily reproduce an appropriate pressing force, and the pressing portion is compact. There is an effect that it is possible to improve the operability and workability.

Further, the disc spring used in the present invention is
Since the resilience is more stable than a normal compression coil spring, there is an effect that the pressing force of the deckle seal bar can be easily adjusted to an appropriate value.

Claim 4: A cooling means is provided at a position corresponding to the slit opening in the front end of the die side plate,
By this cooling means, the molten resin around the front end of the die side plate is cooled to increase the viscosity and reduce the fluidity, so that the deckle seal bar and the step between the side surfaces of the die and the lower lip and the die ， In addition to having the effect of preventing leakage of molten resin from the gap caused by the step between the end surface of the lower lip and the front end surface of the die side plate, the front end part of the die side plate is locally cooled. There is an effect that the cooling means having a simple structure can efficiently cool.

Claim 5: Cooling means is provided at the tip of the deckle seal bar, and when changing the discharge width of the slit opening, the tip of the deckle seal bar is cooled by the cooling means. Therefore, in addition to preventing molten resin from adhering to the tip of the deckle seal bar and effectively suppressing the decrease in product yield due to the die line, the front end of the die side plate is locally cooled. Since it is set, there is an effect that it can be efficiently cooled with a simple structure.

Claim 6: Since the cooling means is provided at a position corresponding to the slit opening in the front end portion of the die side plate, and the cooling means is provided at the tip end portion of the deckle seal bar, the deckle seal bar and the die It is possible to prevent leakage of molten resin from the gap caused by the step between the side surfaces of the upper and lower lips and the step between the end surface of the die and the lower lip and the front end surface of the die side plate, and the edge of the deckle seal bar. It also has an effect of eliminating the problem that the product line is reduced by inducing a die line due to the adhesion of the molten resin to the tip end of the shape.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is an enlarged vertical sectional view of a hydraulic diaphragm used in the first embodiment.

5 is a view taken along the line CC of FIG.

FIG. 6 is a front view of a main part of a second embodiment of the present invention.

7 is a cross-sectional view taken along the line DD of FIG.

8 is a cross-sectional view taken along the line EE of FIG.

FIG. 9 is an enlarged cross-sectional view of a disc spring used in the second embodiment.

FIG. 10 is a partially cutaway front view of the third embodiment of the present invention.

11 is a partially cutaway plan view of FIG.

FIG. 12 is a front view of a main part of a fourth embodiment of the present invention.

13 is a partially cutaway plan view of FIG.

FIG. 14 is a front view of a conventional movable outer deckle that is generally used.

15 is a sectional view taken along line FF of FIG.

16 is a sectional view taken along line GG of FIG.

FIG. 17 is a side view showing a sheet-shaped article forming apparatus based on the T-die method having a movable outer deckle.

FIG. 18 is a front view showing a pressing means for a deckle seal bar according to a conventional push bolt method.

19 is a cross-sectional view taken along the line HH of FIG.

20 is a cross-sectional view taken along the line I-I of FIG. 18.

FIG. 21 is a cross-sectional view showing another example of the deckle seal bar with respect to FIG.

FIG. 22 is an explanatory diagram showing a step between the side surfaces of the die upper and lower lips and a step between the end surfaces of the die upper and lower lips and the front end surface of the die side plate.

[Explanation of Codes] 1 ... Die top lip 2 ... Die bottom lip 3 ... Die side plate 4 ... Slit opening 5 ... Deckel seal bar 5 '... Deckel seal bar tip 6 ... Deckel holder 8 ... Deckel side plate 9 ... For sliding Feed shaft 10 ... Guide shaft for slide XX '... Sliding direction of deckle seal bar 30 ... Hydraulic diaphragm 31 ... Exterior tube 34 ... Diaphragm receiver 35 ... Hydraulic hole 37 ... Pusher 39 ... Hydraulic passage 41 ... Disc spring 44 ... Pusher 45 ... push-in bolt 46 ... depth gauge hole 49 ... cooling means at the tip of the die side plate 53 ... cooling pipe at the tip of the deckle seal bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Abe 2-2 No.28 Kurashiki-cho, Nakajo-cho, Kitakanbara-gun, Niigata Prefecture Kuraray Co., Ltd.

Claims (6)

[Claims] 1. A movable outer deckle that variably controls a discharge width of a slit opening by arranging a deckle seal bar over the end faces of the upper and lower lips of the die and an end face of the die side plate, and moving the deckle seal bar. The movable outer deckle according to claim 1, wherein pressing portions are provided at a plurality of positions in the sliding direction of the deckle seal bar, and each pressing portion is provided with adjusting means for uniformly adjusting the pressing force with respect to the deckle seal bar. 2. A movable outer deckle that variably controls a discharge width of a slit opening by arranging a deckle seal bar over the end faces of the die upper and lower lips and an end face of the die side plate and moving the deckle seal bar. In the above, the movable type is characterized by installing hydraulic diaphragms at a plurality of positions in the sliding direction of the deckle seal bar, and connecting the plurality of hydraulic diaphragms to a hydraulic unit that uniformly controls the pressing force against the deckle seal bar. Outer deckle. 3. A movable outer deckle that variably controls a discharge width of a slit opening by arranging a deckle seal bar over the end faces of the upper and lower lips of the die and an end face of the die side plate and moving the deckle seal bar. The movable outer deckle according to claim 1, wherein disc springs are installed at a plurality of positions in the sliding direction of the deckle seal bar, and each disc spring is provided with adjusting means for uniformly adjusting the pressing force against the deckle seal bar. 4. The movable outer deckle according to claim 1, wherein a cooling means is provided at a position corresponding to the slit opening in the front end portion of the die side plate. 5. The movable outer deckle according to claim 1, wherein a cooling means is provided at a tip portion of the deckle seal bar. 6. A cooling means is provided at a position corresponding to a slit opening in a front end portion of the die side plate,
The movable outer deckle according to any one of claims 1 to 3, wherein a cooling means is provided at a tip portion of the deckle seal bar.