JP2020075476A - T-die, t-die packing, lateral sealing mechanism, and sheet film manufacturing apparatus - Google Patents

Abstract

To provide a T-die, a packing for T-die, a side sealing mechanism, and a sheet film manufacturing apparatus that can prevent resin leakage from the side of the main body of a T-die, suppress the erosion (biting) into the flow channel caused by the deformation of the packing, which is a hindrance to the adjustment of the lip gap, and improve the operability.SOLUTION: A T-die body having a land portion flow channel and a lip portion flow channel in which molten resin flows between the inner surface of the first die block and the inner surface of the second die block, and a side sealing mechanism attached to the side of the T-die body to seal the side of the land portion flow channel and the side of the lip portion flow channel, the side sealing mechanism comprising a packing whose flow surface blocks the side of the land portion flow channel and the side of the lip portion flow channel, and an anti-extrusion part that prevents the packing from being deformed between the inner surface of the first die block and the inner surface of the second die block by allowing the packing to deform toward the side of the counter-flow surface.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a T die that widens and discharges a molten resin that is pressure-fed from an extruder into a sheet or film shape, a T die packing and a side sealing mechanism attached to the T die, and the T die. The present invention relates to a sheet / film manufacturing apparatus used. In particular, it relates to an improvement for improving the operability of the T-die while preventing the resin from leaking from the T-die.

  The sheet / film manufacturing apparatus has a T-die at the tip of the extruder in order to widen and discharge the molten resin pressure-fed from the extruder into a sheet or film (see Patent Document 1). ..

Here, the conventional T die 1 will be described.
FIG. 1 is a diagram showing a schematic configuration of a conventional T die 1.
An orthogonal coordinate system is set by setting the width direction of the T die 1 as the X direction, the flowing direction of the molten resin in the T die 1 as the Y direction, and the thickness direction of the molten resin in the T die 1 as the Z direction.

The T die 1 includes a T die body 10.
In the T-die body 10, an inlet 11 for the molten resin is provided on the upstream side in the flowing direction (Y direction) of the molten resin. A slit-shaped lip gap (ejection port) 12 is formed on the downstream side along the width direction (X direction).
The supplied molten resin is widened in the manifold portion 14 through the inlet 11 and the flow path 13. The expanded molten resin further passes through the flow path 15 and is discharged from the lip gap 12 between the movable lip 16 and the fixed lip 17 in a sheet shape or a film shape.

  In the T die 1, adjustment of the lip gap 12 is an essential operation in order to discharge the molten resin widened in the manifold portion 14 in a sheet shape or a film shape evenly across the width direction. Therefore, by pushing and pulling the movable lip 16 with the adjusting bolts 18 provided in the width direction, the position of the movable lip 16 with respect to the fixed lip 17 is adjusted in the width direction, and the molten resin is uniformly discharged. I am trying to do it.

In forming the flow path 15 of the molten resin inside the T-die body 10, in order to prevent resin leakage from the side-face 10s during the molding operation, as shown in FIG. , Packing 19 is attached.
In this case, the packing 19 is fixed by being screwed into the side plate 21 by screwing a set screw 22 penetrating the side plate 21 to press the side plate 10 s to the side surface 10 s where the side of the flow path 15 is exposed via the pressing plate 20. To be done.

No. Shokai 63-170120

However, in the above-described conventional fixing method, when the set screw 22 is pressed, the packing 19 is deformed and bites out (bites into) the flow path 15, so-called biting out (biting) occurs. It may happen.
Therefore, when adjusting the lip gap 12, the operability of both ends of the movable lip 16 in the width direction may be impaired. In particular, when operating the adjusting bolt 18 in the direction of narrowing the lip gap 12, the operability may be impaired.
It is considered that this is largely due to the strong pressing force of the set screw 22, but if the pressing force of the set screw 22 is weak, resin leakage will occur during the molding operation.

  INDUSTRIAL APPLICABILITY The present invention prevents resin leakage from the side surface of the T-die main body and suppresses protrusion (biting) into the flow path due to deformation of the packing, which is an obstacle to the adjustment of the lip gap, thereby improving operability. It is to provide a T-die, a packing for the T-die, a side sealing mechanism, and a sheet / film manufacturing apparatus capable of improving the temperature.

  A T-die according to a first aspect of the present invention is a T-die that widens an introduced molten resin in a width direction in a manifold portion and discharges it in a sheet shape or a film shape from a lip gap. A block and a second die block, and a land channel and a lip channel through which the molten resin flows are formed between the inner surface of the first die block and the inner surface of the second die block facing each other. The T die body is attached to the side surface of the T die body, which is configured to include the side surface of the first die block and the side surface of the second die block. A lateral sealing mechanism for hermetically sealing the lateral sides of the passage, the lateral sealing mechanism being formed in a thin plate shape, and a flow passage surface facing the land flow passage and the lip flow passage, and the flow passage surface. And a flow path surface opposite to the flow path surface, and the flow path surface is brought into contact with and pressed against the side surface of the first die block and the side surface of the second die block so that the flow path surface has the land. A packing that blocks the side of the partial flow path and the side of the lip flow path, and allows the packing to deform toward the side opposite the flow path surface, thereby allowing the inner surface of the first die block and the second die block to be deformed. And a protrusion preventing portion that prevents the packing from deforming between itself and the inner surface of the block.

  Further, the T-die according to the first aspect of the present invention is configured such that the introduced molten resin is widened in the width direction in a plurality of manifold portions, and the widened molten resin is merged with the main flow path to form a sheet shape from the lip gap. Alternatively, a T-die for discharging in a film form, which has a first die block and a second die block facing each other, and at least between the inner surface of the first die block and the inner surface of the second die block which face each other, A structure including a T-die main body in which a main-land flow path and a lip flow path through which molten resin expanded by a main manifold section is formed, a side surface of the first die block, and a side surface of the second die block are formed. A side sealing mechanism that is attached to a side surface of the T-die body and seals at least a side of the main land channel and a side of the lip channel. In the first die block, the first die block side manifold portion and the molten resin widened by the first die block side manifold portion are circulated, and the circulated molten resin is flowed into the main land portion flow path and the lip portion flow. A first die block side land portion flow path that joins with a connection portion of the passage is formed, and the second die block side manifold portion and the second die block side manifold portion widen the inside of the second die block. A second die block side land portion flow channel is formed which circulates the molten resin and joins the circulated molten resin to the connection portion of the main land portion flow passage and the lip portion flow passage. Is a thin plate shape, and a flow path surface facing the main land part flow path and the lip part flow path, and the first die block side land part flow path and the second die block side land part flow path. A flow path surface opposite to the flow path surface, and the flow path surface is abutted and pressed across the side surface of the first die block and the side surface of the second die block, whereby the flow Road surfaces are lateral to the main land channel and lateral to the lip channel, and lateral to the first die block lateral land channel and lateral to the second die block lateral channel. Between the inner surface of the first die block and the inner surface of the second die block, and the land on the first die block side by allowing the packing to close the inner surface of the first die block and the packing to allow the deformation toward the side opposite to the flow path surface. The packing bites between at least the inner surface of the first die block and the inner surface of the second die block in the partial flow path and the second die block side land flow path. A protrusion preventing portion that prevents the deformation of the protrusion.

  The sheet / film manufacturing apparatus according to the second aspect of the present invention includes the T-die according to the first aspect.

  A packing for T-die according to a third aspect of the present invention has a first die block and a second die block which are opposed to each other, and is provided between an inner surface of the first die block and an inner surface of the second die block which are opposed to each other. A land flow path and a lip flow path through which the molten resin flows are formed, and the introduced molten resin is widened in the width direction in the manifold portion and discharged into a sheet or film form from the lip gap. A packing for T-die attached to a side surface of a T-die main body including a side surface of a first die block and a side surface of the second die block, the packing being formed in a thin plate, the land flow path and the A flow passage surface facing the lip portion flow passage, and an opposite flow passage surface opposite to the flow passage surface, the flow passage surface straddling a side surface of the first die block and a side surface of the second die block. By abutting and pressing, the flow passage surface closes the side of the land portion flow passage and the side of the lip portion flow passage, and a recess is formed in the counter flow passage surface.

  A lateral sealing mechanism according to a fourth aspect of the present invention has a first die block and a second die block that face each other, and is provided between the inner surface of the first die block and the inner surface of the second die block that face each other. A land flow path and a lip flow path through which the molten resin flows are formed, and the introduced molten resin is widened in the width direction in the manifold portion and discharged into a sheet or film form from the lip gap. A lateral sealing mechanism attached to a side surface of a T-die main body including a side surface of a first die block and a side surface of the second die block, the side sealing mechanism being formed in a thin plate shape, the land portion flow path and the A flow passage surface facing the lip portion flow passage, and an opposite flow passage surface opposite to the flow passage surface, the flow passage surface straddling a side surface of the first die block and a side surface of the second die block. A packing that allows the flow path surface to close the lateral side of the land flow path and the lateral side of the lip flow path by being pressed against each other, and allowing the packing to deform toward the opposite flow path surface side. Thus, a protrusion preventing portion that prevents the packing from deforming and protruding between the inner surface of the first die block and the inner surface of the second die block is included.

  According to the present invention, it is possible to prevent resin leakage from the side surface of the T-die main body, and to suppress the protrusion (bite) into the flow path due to the deformation of the packing, which is an obstacle to the adjustment of the lip gap. It is possible to improve the operability of the T-die.

It is a sectional side view which shows the schematic structure of the conventional T die. It is a figure which shows the attachment structure of the packing of the conventional T die. It is a figure showing the schematic structure of the sheet film manufacturing device concerning one embodiment of the present invention. It is a partially cutaway perspective view showing a schematic configuration of a T-die according to an embodiment of the present invention. It is a sectional side view which shows the schematic structure of a T-die main body. It is a partially notched perspective view which decomposes | disassembles and shows a side sealing mechanism. It is a figure which shows the mounting structure of the packing and the press board in a side sealing mechanism. It is a figure which shows schematic structure of the packing arrange | positioned at a side sealing mechanism. It is a figure which shows schematic structure of the pressing plate arrange | positioned at a side sealing mechanism. It is a figure which shows arrangement | positioning of the set screw in a side sealing mechanism. Eating of the packing when a sheet manufacturing test was conducted by incorporating a side sealing mechanism having no groove in the pressing plate as a comparative example and a side sealing mechanism having a groove in the pressing plate as the present invention into a T die. It is a figure which shows typically a protrusion (cutting-in) state. It is a figure which shows the measurement profile of the displacement of the flow path surface of the packing in a comparative example. It is a figure which shows the measurement profile of the displacement of the flow path surface of the packing in this invention. It is a figure which shows the measurement profile of the displacement of the opposite flow path surface of the packing in this invention. It is a figure which shows the attachment structure of the packing which concerns on the modification of this invention, and the press board. It is a figure which shows schematic structure of the packing which concerns on the modification of this invention. It is a figure which shows schematic structure of the pressing plate which concerns on the modification of this invention. It is a figure which shows the attachment structure of the packing which concerns on the modification of this invention, and the press board. It is a figure which shows the attachment structure of the packing which concerns on the modification of this invention, and the press board. It is a figure which shows arrangement | positioning of the set screw which concerns on the modification of this invention. It is a figure which shows arrangement | positioning of the set screw which concerns on the modification of this invention. It is a figure which shows arrangement | positioning of the set screw which concerns on the modification of this invention. It is a figure which shows schematic structure of the side plate which concerns on the modification of this invention. It is a figure which shows schematic structure of the multi-manifold type T die main body which concerns on the modification of this invention. It is a partial notch perspective view which decomposes | disassembles and shows the schematic structure and side sealing mechanism of the multi-manifold type T die main body which concerns on the modification of this invention. It is a figure which shows the structural example of the grooved pressing plate of the side sealing mechanism for multi-manifold type T die main bodies which concerns on the modification of this invention. It is a figure which shows the other structural example of the holding plate with a groove | channel of the side sealing mechanism for the multi-manifold type T die main bodies which concerns on the modification of this invention. It is a perspective view which shows the other schematic structure of the multi-manifold type T die main body which concerns on the modification of this invention.

  An embodiment of the present invention will be described below with reference to the accompanying drawings.

[Outline of sheet / film manufacturing apparatus 100]
FIG. 3 shows the configuration of the sheet / film manufacturing apparatus 100 according to the embodiment of the present invention.

  The sheet / film manufacturing apparatus 100 according to the present embodiment is configured to include an extruder 200, a T-die 300, a casting machine 400, a thickness gauge 500, a take-up machine 600, and a take-up machine 700. ing.

  The extruder 200 is a device that plasticizes and extrudes a resin, and melts and kneads the supplied granular or powdery resin into a molten resin, and extrudes the molten resin toward a T-die 300 arranged at the tip. .. The resin supplied to the extruder 200 may be blended with additives and the like.

  The T-die 300 widens the molten resin pressure-fed from the extruder 200 and discharges it as a sheet-shaped or film-shaped molten resin 800 toward the casting machine 400.

  The sheet-shaped or film-shaped molten resin 800 is cooled and solidified by the casting machine 400 to be a sheet or film. After the thickness of the sheet or film is measured by the thickness gauge 500, trimming or the like is performed by the take-up machine 600, and finally the take-up machine 700 takes up the film.

  In the sheet / film manufacturing apparatus 100 having such a configuration, the T-die 300 has a characteristic configuration in the packing attachment structure, and as described in detail below, a side sealing mechanism while preventing resin leakage. It is possible to improve the operability of the T-die 300 by suppressing the protrusion (biting) into the flow path due to the deformation of the packing, which is a factor that hinders the adjustment of the lip gap, by the protrusion preventing part. Is configured to be.

  In the following description, the sheet / film manufacturing apparatus 100 will be simply referred to as the sheet manufacturing apparatus 100, and the sheet or film will be simply referred to as the sheet.

[Regarding the configuration of the T-die 300]
FIG. 4 shows a schematic configuration of the T die 300 according to this embodiment.
In the present embodiment, in each drawing, the width direction of the T die 300 is the X direction, the flowing direction of the molten resin in the T die 300 is the Y direction, and the thickness direction of the molten resin in the T die 300 is the Z direction. The Cartesian coordinate system is set.

The T-die 300 includes a T-die body 310 and a side sealing mechanism 320.
The side sealing mechanism 320 is arranged at both ends in the width direction of the T-die main body 310, but since both mechanisms have the same configuration, the side sealing of one end is shown in FIG. Only the mechanism 320 is shown, and the side sealing mechanism at the other end is cut away with a portion of the T-die body 310.

[About the structure of the T-die main body 310]
FIG. 5 shows a schematic configuration of the T-die main body 310.
In the T-die main body 310, a rear end portion 310RE of the Y direction is provided with an inlet 311 for introducing the molten resin pressure-fed from the extruder 200. A slit-shaped lip gap 314 is formed along the width direction (X direction) between the movable lip 312 and the fixed lip 313 as a discharge port for discharging the molten resin at the tip portion 310TP in the Y direction. It is provided.
A resin flow path RP of molten resin is formed inside the T-die main body 310, and the molten resin introduced from the introduction port 311 flows through the resin flow path RP and is discharged in a sheet shape from the lip gap 314. It

The T-die main body 310 is configured to have a first die block 350 and a second die block 360.
In the first die block 350, the movable lip 312 described above is provided at the tip of the block body 351. The movable lip 312 is provided with a thin neck portion 352 between itself and the block body 351. In other words, the movable lip 312 is integrally connected to the block body 351 via the thin neck portion 352.
In the second die block 360, the aforementioned fixing lip 313 is integrally provided at the tip of the block body 361.

  The T die body 310 is configured such that the first die block 350 and the second die block 360 are overlapped with each other via the inner surfaces 350R and 360R facing each other, and are connected and fixed to each other by a plurality of bolts (not shown). .. In other words, the T-die main body 310 is configured by the first die block 350 and the second die block 360 abutting the inner surfaces 350R, 360R facing each other, and firmly fastened to each other by a plurality of bolts (not shown). There is. In addition, the first die block 350 and the second die block 360 are overlapped and fixed so that the movable lip 312 and the fixed lip 313 face each other and the block body 351 and the block body 361 face each other.

The inner surface 350R of the first die block 350 and the inner surface 360R of the second die block 360 are recessed (recessed, dented, or grooved) for forming a gap serving as the resin flow path RP in a state of being superposed and fixed. Is provided.
Due to this recess, an introduction flow path 315, a manifold section 316, a land section flow path 317, and a lip section flow path 318 that form a resin flow path RP of the molten resin are formed inside the T-die body 310.

Specifically, inside the T-die body 310, an introduction flow path 315 that communicates with the introduction port 311 of the rear end portion 310RE is formed.
The introduction flow path 315 is a flow path for introducing the molten resin sent from the introduction port 311 into the manifold portion 316.
A manifold portion 316 communicating with the introduction flow passage 315 is formed at the tip of the introduction flow passage 315. The manifold portion 316 widens the introduced molten resin in the width direction (X direction).

Further, a land portion flow path 317 communicating with the manifold portion 316 is formed at the tip of the manifold portion 316.
The land portion channel 317 is a channel for reducing the thickness of the molten resin expanded in the manifold portion 316 in the Z direction. The land channel 317 is formed in the range from the outlet of the manifold 316 to the front of the movable lip 312.

Then, at the tip of the land channel 317, a lip channel 318 communicating with the land channel 317 is formed.
The lip channel 318 is a channel for adjusting the thickness unevenness of the molten resin in the width direction, and is formed in the range of the movable lip 312. The tip of the lip portion flow path 318 communicates with the lip gap 314. The adjustment of thickness unevenness will be described later.

  As a result, the molten resin fed from the introduction port 311 of the rear end portion 310RE of the T-die main body 310 flows through the introduction flow path 315 and is introduced into the manifold portion 316, widened by the manifold portion 316, and then the land portion. It is thinned while flowing through the flow path 317, and the thickness unevenness is adjusted while continuously flowing through the lip portion flow path 318, and is discharged in a sheet form from the lip gap 314 of the tip portion 310TP of the T-die body 310.

  In the T-die 300, when the molten resin is discharged from the lip gap 314 in a sheet shape, adjustment of the lip gap 314 (adjustment of the movable lip 312) is indispensable in order to discharge the molten resin evenly in the width direction. Is. To adjust the lip gap 314, the movable lips 312 are moved by pushing and pulling the movable lips 312 with the adjusting bolts 319 provided in the width direction of the T-die main body 310, and the position of the movable lips 312 with respect to the fixed lip 313. Is adjusted over the width direction so that the molten resin is uniformly discharged.

  Although FIG. 4 and FIG. 5 show the case where a plurality of adjusting bolts 319 are provided and the lip gap 314 is manually adjusted, a case where a mechanism that uses thermal displacement or electric power is provided is used for automatic adjustment. There is also.

[Regarding the configuration of the side sealing mechanism 320]
In the T-die 300, a side sealing mechanism 320 is attached to the side surface 310S of the T-die body 310, as shown in FIGS. 6 and 7.

The side surface 310S of the T-die main body 310 includes side surfaces 350S and 360S facing the X direction (width direction) of the first die block 350 and the second die block 360.
Between the side surface 350S and the side surface 360S, the land portion flow path 317 and the lip portion flow path 318 that are formed between the inner surface 350R of the first die block 350 and the inner surface 360R of the second die block 360 are located laterally ( The side portion in the X direction) is opened and exposed to form a channel side exposed portion PE.
The side sealing mechanism 320 seals the flow path side exposed portion PE in order to prevent resin leakage from the side surface 310S during the molding operation.

  The side sealing mechanism 320 includes a T-die packing 321, a pressing member 322 (322-1, 322-2), a pair of side plates 323 (323-1, 323-2), a set screw 324, and a bite. It is configured to include the protrusion prevention unit 330 (FIG. 7). In the following description, the T-die packing 321 will be simply referred to as the packing 321.

  The pair of side plates 323-1 and 323-2 are spaced apart from the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360 so as to avoid the flow path side exposed portion PE. It is attached. When attaching the side plates 323-1 and 323-2, it is preferable that the side plates 323-1 and 323-2 are firmly fastened with bolts 370.

In a state where the side plate 323-1 is attached to the side surface 350S of the first die block 350 and the side plate 323-2 is attached to the side surface 360S of the second die block 360, the side plates 323-1 and 323-2 are respectively, It has side surfaces 323-1S and 323-2S facing each other while being separated from each other.
Then, on the side plates 323-1 and 323-2, at the positions opposite to the side surfaces 350S and 360S, the convex portions 323-1T protruding from the side surfaces 323-1S and 323-2S in directions approaching each other, 323-2T is provided.

The packing 321 is inserted between the side plate 323-1 and the side plate 323-2 in a state where the pair of side plates 323-1 and 323-2 are attached to the T-die body 310.
Specifically, the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360, the side surface 323-1S of the side plate 323-1 and the side surface 323-2S of the side plate 323-2, and the convex portion 323-. It is housed in the space surrounded by 1T and the convex portion 323-2T.

  The packing 321 has a flow path surface FC11 facing the flow path side exposed portion PE and a non-flow path surface FC12 opposite to the flow path surface FC11. The packing 321 is attached so that the flow path surface FC11 closes the flow path side exposed portion PE and contacts the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360. In other words, the packing 321 is attached so that the flow path surface FC11 is in contact with the side surface 350S and the side surface 360S, and covers the flow path side exposed portion PE.

  As the packing 321, an aluminum packing formed in a flat plate shape (thin plate shape) or a heat resistant rubber packing such as silicon rubber is used.

As shown in FIG. 8, the packing 321 is long in the Y direction, short in the Z direction, and thin in the X direction.
In the packing 321, the distance in the Y direction represents the length LD1 of the packing 321, the distance in the Z direction represents the width TD1 of the packing 321, and the distance in the X direction represents the thickness TC1 of the packing 321. For example, as an example, the packing 321 is formed in a thin plate shape having a length LD1 of about 170 mm to 200 mm, a width TD1 of about 20 mm to 50 mm, and a thickness TC1 of about 2 to 5 mm.
The tip 321TP has a shape in which the width TD1 is gradually reduced so as to follow the shape of the tip 310TP of the T-die body 310.

The pressing member 322 includes a pressing plate 322-1 and a receiving plate 322-2.
Like the packing 321, the pressing plate 322-1 and the receiving plate 322-2 are inserted between the side plate 323-1 and the side plate 323-2.

The pressing plate 322-1 is in contact with the counter flow path surface FC12 of the packing 321, and presses the packing 321 against the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360, and the pressing surface FC21. And a counter-pressing surface FC22 on the opposite side.
The pressing plate 322-1 is placed between the pair of side plates 323-1 and 323-2 so as to overlap the packing 321 so that the pressing surface FC21 and the non-flow passage surface FC12 of the packing 321 come into contact with each other.

  The pressing plate 322-1 is made of flat plate-shaped (plate-shaped) metal such as carbon steel (for example, S45CP). The material of the pressing plate 322-1 is preferably higher in rigidity than the material of the packing 321.

Since the pressing plate 322-1 is attached to the packing 321 in an overlapping manner, it has basically the same surface shape as the packing 321.
That is, the pressing plate 322-1 is formed to be long in the Y direction and short in the Z direction as shown in FIG. 9. In the X direction, the pressing plate 322-1 is formed thicker than the thickness TC1 of the packing 321.
In the pressing plate 322-1, the distance in the Y direction is the length LD2 of the pressing plate 322-1, the distance in the Z direction is the width TD2 of the pressing plate 322-1, and the distance in the X direction is the thickness of the pressing plate 322-1. Represents TC2. For example, as an example, similarly to the packing 321, the length LD2 is formed to be about 170 mm to 200 mm and the width TD2 is formed to be about 20 mm to 50 mm, and the thickness TC2 is thicker than the packing 321 and has a plate shape of about 5 to 10 mm. Has been formed.
The tip portion 322TP has a shape in which the width TD2 is gradually reduced so as to follow the shape of the tip portion 310TP of the T-die body 310.

The receiving plate 322-2 is inserted between the convex portions 323-1T and 323-2T of the pair of side plates 323-1 and 323-2 and the pressing plate 322-1.
The receiving plate 322-2 is a member for pressing the packing 321 against the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360 via the pressing plate 322-1.

  Specifically, the receiving plate 322-2 is formed with a screw hole 322-2H penetrating in the thickness direction (X direction). When the set screw 324 is screwed into the screw hole 322-2H from the convex portion 323-1T, 323-2T side toward the holding plate 322-1 side, the tip of the set screw 324 passes through the receiving plate 322-2, It abuts against the non-pressing surface FC22 of the pressing plate 322-1. Since the side edge of the receiving plate 322-2 abuts against the convex portions 323-1T and 323-2T and is locked, when the set screw 324 is further screwed in, the tip of the set screw 324 is pressed down by the pressing plate 322-1. And the packing 321 is pressed against the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360.

The set screw 324 has the load center LDC in the Z direction in the Z direction so that the packing 321 is evenly pressed against the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360. It is mounted to match the CTR.
Then, as shown in FIG. 10, in the Y direction, a plurality of setscrews 324 (324-1 to 324-6) are arranged in a line at intervals.

  In the present embodiment, on the side surface 310S of the T-die body 310, even if the adjustment of the lip gap 314 (adjustment of the movable lip 312) is performed by the adjustment bolt 319, the manifold portion 316 and the introduction flow passage 315 are formed. Since the state of the rear end portion 310RE side of the block body 351 of the first die block does not change (do not deform), the side surface 310S is sealed with a member different from the packing 321. In the above description, the numerical values of the length LD1 of the packing 321 and the length LD2 of the pressing plate 322-1 are examples of the case where the packing 321 blocks the flow path side exposed parts PE of the land flow path 317 and the lip flow path 318. It is shown.

[Regarding the configuration of the leakage prevention unit 330]
The lateral sealing mechanism 320 is provided with a protrusion preventing portion 330 (FIGS. 7 and 9). The sticking-out prevention unit 330 is configured by a recess 331 provided on the pressing surface FC21 of the pressing plate 322-1.

Here, when the sticking-out prevention portion 330 is not formed on the pressing surface FC21 of the pressing plate 322-1 and the packing 321 is pressed by the set screw 324, the non-flow passage surface FC12 of the packing 321 is restrained by the pressing surface FC21. Since the deformation of the counter flow path surface FC12 is suppressed, the flow path surface FC11 of the packing 321 may dig out (bite into) the land flow path 317 or the lip flow path 318 (bite). ..
Therefore, when adjusting the lip gap 314, the operability of both ends of the movable lip 312 in the width direction (X direction) may be impaired. In particular, when operating the adjustment bolt 319 in the direction of narrowing the lip gap 314, the operability may be impaired.
If the pressing force of the set screw 324 is weakened in order to suppress the protrusion (bite) of the flow path surface FC11 of the packing 321, resin leakage may occur during the molding operation. It is necessary to press strongly with the pressing force of.

Therefore, in the side sealing mechanism 320, as described above, the recess 331 is provided in the pressing surface FC21 of the pressing plate 322-1 to prevent resin leakage from the side surface 310S of the T die body 310 during the molding operation. At the same time, the flow path surface FC11 of the packing 321 is prevented from being deformed (biting into) the land flow path 317 and the lip flow path 318, thereby improving the operability of the T-die.
The deformation in which the flow channel surface FC11 of the packing 321 digs out (bites into) the land channel 317 and the lip channel 318 is, in other words, the flow channel surface FC11 of the packing 321 corresponds to the inner surface 350R of the first die block 350. This means that the deformation is a bite (bite) into the inner surface 360R of the second die block 360.

The concave portion 331 as the protrusion preventing portion 330 is formed on the pressing surface FC21 of the pressing plate 322-1 that faces and abuts the non-flow passage surface FC12 of the packing 321 in accordance with the shape of the flow passage side exposed portion PE. ..
When the pressing surface FC21 of the pressing plate 322-1 is in contact with the counter flow path surface FC12 of the packing 321, a space SPC is formed in the recess of the recess 331.

The concave portion 331 of the pressing surface FC21 is configured by a groove portion 332 provided by cutting the corresponding portion of the pressing surface FC21.
The groove portion 332 is arranged so that the center line CTR coincides with the flow path side exposed portion PE in the Z direction, and faces the flow path side exposed portion PE with the packing 321 in between in the X direction.

  The length LD21 of the groove portion 332 in the Y direction is about 80 mm to 100 mm from the front end portion 322TP of the pressing plate 322-1 toward the rear end portion, and is provided on the first die block 350 from the front end portion 310TP of the T die body 310. The length is set to have a margin of about 5 mm from the distance to the base of the thin neck 352 (the bending base of the movable lip 312). The base portion of the neck 352 is an end portion on the rear end portion 310RE side of the neck 352 extending in the Y direction, and refers to a connecting portion with the block body 351.

The width TD21 of the groove portion 332 in the Z direction is preferably set to be wider by 0.5 mm to 2 mm on each side than the reference width WPE of the channel side exposed portion PE in the Z direction, and is wider by 1 mm on each side. It is more preferable that it is set. The reference width WPE in the Z direction of the lateral passage exposed portion PE refers to the width in the Z direction of the lateral exposed portion PE in the initial state before the adjustment of the lip gap 314 by the adjustment bolt 319.
The depth DP21 of the groove portion 332 in the X direction is preferably set in the range of 0.5 mm to 2.0 mm.

[Effect of One Embodiment]
According to the configuration of the present embodiment, the packing 321 is pressed against the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360 to the pressing surface FC21 of the pressing plate 322-1. Since the (concave portion 331) is provided, the space SPC that allows the packing 321 to deform toward the side opposite to the flow channel surface FC12 is formed in the flow channel side exposed portion PE.
During the molding operation, the resin pressure of the molten resin flowing through the resin flow path RP exerts a pressure on the packing 321 toward the side opposite the flow path surface FC12, and this pressure causes the packing 321 to deform toward the side opposite the flow path surface FC12. Can be accommodated in the space SPC without being restrained.
Therefore, the resin leakage from the side surface 310S of the T-die main body 310 is prevented, and the adjustment of the lip gap 314 impedes the flow-path 317 (318) due to the deformation of the packing 321 which is a factor that hinders (cuts into). ) Is suppressed (prevented), and the operability of the T-die 300 is improved.
The bottom surface of the groove 322 (recess 331) serves as a receiving surface for receiving the packing 321 so as not to excessively deform it.

  Furthermore, by setting the width TD21 of the groove portion 332 (recess 331) to be wider than the reference width WPE of the flow path side exposed portion PE, preferably 0.5 mm to 2 mm on each side, and more preferably 1 mm on each side. When the resin pressure acts, the packing 321 can be easily deformed to the side opposite to the flow path. In other words, with respect to the reference width WPE of the flow path side exposed portion PE, the surplus width of the groove portion 332 is set to be 0.5 mm to 2 mm on both sides, more preferably 1 mm on each side, so that the resin pressure is increased. When actuated, the packing 321 can be easily deformed toward the side opposite to the flow path surface FC12. As a result, the protrusion (biting) into the flow path due to the deformation of the packing is reliably suppressed, and the operability of the T die is further improved.

Even when the packing 321 is attached, the excess width of the groove portion 332 (recessed portion 331) is set to 0.5 mm to 2 mm on both sides, and more preferably set to 1 mm on each side, and pressed by the pressing plate 322-1. At this time, the packing 321 is easily deformed to the side opposite to the flow channel surface FC12, and the protrusion (biting) into the flow channel is suppressed or alleviated, so that the adjustment before the production operation becomes easy.
If the surplus width is narrower than 0.5 mm, the packing 321 is less likely to be deformed toward the non-flow channel surface FC12 side, and accordingly, the deformation toward the flow channel surface FC12 side may be increased. ..
When the surplus width is wider than 2.0 mm, the molten resin is discharged between the flow path surface FC11 of the packing 321 and the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360 during the molding operation. May get in.

[About verification test of effect of one embodiment]
A side sealing mechanism 320 in which the pressing plate 332-1 having no groove portion 332 was set and a side sealing mechanism 320 in which the pressing plate 332-1 provided with the groove portion 332 were set were prepared. In other words, the side sealing mechanism 320 according to the related art "no groove on the pressing plate" and the side sealing mechanism 320 according to the present invention "having a groove on the pressing plate" were prepared. Next, the two lateral sealing mechanisms 320 were attached to one side surface 310S and the other side surface 310S of the T-die body 310.
Then, a sheet manufacturing test was carried out by using the polypropylene resin as a raw material by the sheet manufacturing apparatus 100 (test apparatus) in which the T die 300 was set.

The size of the pressing plate 332-1 provided with the groove portion 332 is as follows.
Pressing plate length LD2: 175mm
Width of pressing plate TD2: 30 mm
Pressing plate thickness TC2: 8 mm
Groove length LD21: 90 mm
Groove width TD21: 6 mm
Surplus width of groove: 1mm on each side
Groove depth DP21: 1 mm

  The sheet manufacturing test was carried out for 15 hours, and the resin from the side surface 310S to which the “holding plate has a groove” side sealing mechanism 320 and the side surface 310S to which “the pressing plate has no groove” side sealing mechanism 320 were attached There are no leaks.

  However, the adjustment of the lip gap 314 (adjustment of the movable lip 312) was performed during the sheet manufacturing test, and the operation of narrowing the lip gap 314 was performed. The rotation of the adjustment bolt 319 at the end portion of No. 3 was firm, whereas the rotation of the adjustment bolt 319 at the end portion on the side of the side sealing mechanism 320 where “the groove was formed on the pressing plate” was smooth.

Further, after completion of the sheet manufacturing test, the state of the aluminum packing set in each side sealing mechanism 320 was investigated.
FIG. 11A is a diagram schematically showing a deformed state of the packing 321 set in the side sealing mechanism 320 having no groove on the pressing plate as a comparative example. Then, FIG. 11B is a diagram schematically showing a deformed state of the packing 321 set in the “sealing portion on the pressing plate” side sealing mechanism 320 according to the present invention.

Further, FIG. 12 is a diagram showing a measurement profile obtained by actually measuring the displacement of the flow path surface FC11 of the packing 321 in the comparative example.
FIG. 13 is a diagram showing a measurement profile obtained by actually measuring the displacement of the flow path surface FC11 of the packing 321 in the present invention.
FIG. 14 is a diagram showing a measurement profile obtained by actually measuring the displacement of the non-flow passage surface FC12 of the packing 321 in the present invention.

From FIG. 11 (A) and FIG. 12, in the comparative example using the “no groove on the pressing plate” side sealing mechanism 320, a large protrusion (biting) appears on the flow passage surface FC11 of the packing 321. confirmed.
On the other hand, by applying the side sealing mechanism 320 having “the groove is formed on the pressing plate” according to the present invention, as shown in FIG. 11 (B) and FIG. 13, the protrusion of the flow path surface FC11 of the packing 321 is extruded. (Bite) was eliminated, and as shown in FIG. 11 (B) and FIG. 13, dents were found on the flow path surface FC11.
Then, by applying the present invention, as shown in FIGS. 11B and 14, it was confirmed that the packing 321 was deformed toward the side opposite to the flow path surface FC12. This is considered to be connected to the suppression of the sticking out (cutting in) of the packing, which should originally stick out (cutting into) the flow path 317 (318).

As described above, by forming the groove portion 332 (recessed portion 331) in the pressing plate 322-1, the packing 321 is deformed to the side opposite to the flow channel surface FC12 side, and the packing 321 is extruded into the flow channel 317 (318) ( It was found that the bite) was eliminated, and the adjustment bolt 319 during the adjustment of the lip gap 314 also smoothly rotated, and the operability of the T die 300 was improved.
It should be noted that the sheet manufacturing test can be operated without resin leakage.
As a result, it has been proved that the above-described effects can be obtained by using the T-die 300 having the “holding plate has a groove portion” side sealing mechanism 320 according to the present invention.

[Modification of the protrusion prevention section 330]
In the above-described embodiment, the protrusion preventing portion 330 is provided on the pressing surface FC21 of the pressing plate 322-1, but instead of this, the protrusion preventing portion 330 is provided on the non-flow passage surface FC12 of the packing 321. Is also good.
As shown in FIGS. 15 to 17, the protrusion prevention portion 330 of this modification is formed on the non-flow passage surface FC12 of the packing 321, and the pressing surface FC21 of the pressing plate 322-1 is a flat surface. A groove portion 332 (recessed portion 331) having a length LD11, a width TD11, and a depth DP11 is provided on the non-flow passage surface FC12 of the packing 321 as a protruding portion 330. The length LD11, the width TD11, and the depth DP11 have the same dimensions as the length LD21, the width TD21, and the depth DP21, respectively. Accordingly, even in the conventional T die, the protrusion preventing portion 330 can be formed without replacing the pressing plate.

Note that the protrusion preventing portion 330 may be provided on both the pressing plate 322-1 and the packing 321 as shown in FIG. 18.
Further, in the above-described embodiment, the depression 331 (groove 332) is provided by cutting the pressing surface FC21, but as shown in FIG. 19, the three divided pressing plate pieces 322-1 and 322-12 are provided. , 322-13 may be used to form the recess 331 by overlapping the narrow pressing plate pieces 322-11 and 322-12 on both sides of the wide pressing plate piece 322-13.

[Modification of Arrangement of Set Screw 324]
In the above-described embodiment, the set screw 324 is attached so that the load center LDC is aligned with the center portion CTR of the flow path side exposed portion PE in the Z direction. Instead, the set screw 324 is attached in the Z direction. In, in the flow path side exposed portion PE, the central portion CTR may be sandwiched and attached at two positions.
As shown in FIG. 20, in the set screw 324 of the present modification, the load center LDC is displaced from the central portion CTR of the flow path side exposed portion PE in the Z direction, for example, around the shoulder portion of the groove portion 332 (so-called bank portion). It is attached to each). As a result, the pressing force can be adjusted at two points in the Z direction, and the pressing can be performed more uniformly.

Then, as shown in FIG. 21, in the Y direction, the plurality of setscrews 324 (324-21 to 324 to 112) are arranged in two rows at intervals.
Note that, as shown in FIG. 22, a plurality of setscrews 324 (324-21 to 324 to 112) may be arranged in a zigzag pattern at intervals in the Y direction.

[Modification of Side Plate 323]
Although the pair of side plates 323-1, 323-2 are used as the side plates 323 in the above-described embodiment, an integral side plate 323 may be used instead of this.
As shown in FIG. 23, the integral side plate 323 is provided with a recess 323F for accommodating the packing 321 and the pressing member 322 (pressing plate 322-1) at the position of the flow path side exposed portion PE. A screw hole 323H into which the set screw 324 is screwed is provided in the thin portion 323G of the side plate 323, which is thin due to the formation of the recess 323F.

Then, by screwing the set screw 324 from the thin portion 323G, the packing 321 is attached to the side surface 350S of the first die block 350 and the side surface 360S of the second die block 360 via the holding member 322 (holding plate 322-1). It is pressed.
Thereby, the packing 321 can be pressed without using the receiving plate 322-2.

[Other modifications]
FIG. 24 shows a schematic structure of a multi-manifold type T-die main body according to a modification of the present invention.
FIG. 25 is a partially cutaway perspective view showing a schematic configuration of a multi-manifold type T-die main body according to a modification of the present invention and a side sealing mechanism in an exploded manner.

In the embodiment described above, the T-die body 310 is a two-piece die formed by stacking two die blocks (the first die block 350 and the second die block 360), and one main manifold portion is provided in the overlapping portion. Between the inner surface 350R of the first die block 350 and the inner surface 530R of the second die block 360, the main land channel 317 and the lip channel 318 that circulate the molten resin expanded from the main manifold section 316. Is formed as a single layer type T-die 300.
However, instead of the single-layer type T die, in addition to the main manifold portion 316 formed between the inner surface 350R of the first die block 350 and the inner surface 530R of the second die block 360, the first die block side manifold It may be a multi-many hold type T die having the portion 3161 and the second die block side manifold portion 3162.

In the multi-manifold type T die 300A, as shown in FIG. 24, in the T die main body 310A, the first die block 350A and the second die block 360A face each other as in the case of the single layer type of FIG. The inner surfaces 350R and 360R are overlapped with each other and are connected and fixed to each other by a plurality of bolts (not shown).
In other words, the T-die body 310A is configured by the first die block 350A and the second die block 360A abutting the inner surfaces 350R, 360R facing each other, and being firmly fastened to each other by a plurality of bolts (not shown). There is. The first die block 350A and the second die block 360A are superposed and fixed so that the movable lip 312 and the fixed lip 313 face each other and the block body 351A and the block body 361A face each other.

On the inner surface 350R of the first die block 350A and the inner surface 360R of the second die block 360A, in the state of being superposed and fixed, a concave portion (a dent, a depression or a groove) for forming a gap which becomes the main resin flow path RPM. ) Is provided.
Due to this recess, a main introduction flow path 315M, a main manifold section 316M, a main land section flow path 317M, and a lip section flow path 318 that form the main resin flow path RPM of the molten resin are formed inside the T-die body 310A. It

In detail, a main introduction flow passage 315M communicating with the main introduction port 311M of the rear end portion 310RE is formed in the center of the inside of the T-die body 310A.
The main introduction flow path 315M is a flow path for introducing the molten resin fed from the main introduction port 311M into the main manifold portion 316M.
A main manifold portion 316M communicating with the main introduction flow passage 315M is formed ahead of the main introduction flow passage 315M. The main manifold portion 316M widens the introduced molten resin in the width direction (X direction).

Further, a main land portion flow path 317M communicating with the main manifold portion 316M is formed at the tip of the main manifold portion 316M.
The main land portion flow path 317M is a flow path for reducing the thickness in the Z direction of the molten resin expanded in the main manifold portion 316M. The main land portion channel 317M is formed in the range from the outlet of the main manifold portion 316M to the connection portion CN with the lip portion channel 318.

  In addition, the molten resin widened by the first die block side manifold portion 3161 is circulated to the connection portion CN between the main land channel 317M and the lip channel 318, and the circulated molten resin is supplied to the main land channel 317M. To the connection portion CN of the lip portion flow path 318, the first die block side land portion flow path 3171 is connected, and the molten resin widened by the second die block side manifold portion 3162 is circulated. The second die block side land channel 3172 that joins the connection portion CN between the main land channel 317M and the lip channel 318 is connected.

Then, a lip portion flow path 318 that communicates with the main land flow path 317M via the connection portion CN is formed at the tip of the main land flow path 317M.
The lip portion flow path 318 is a flow path for adjusting the thickness unevenness of the molten resin in the width direction, and is formed in the range of the movable lip 312, the neck 352, and the like. The tip of the lip portion flow path 318 communicates with the lip gap 314.

  Further, in the T-die main body 310A, the first die block side introduction flow channel 3151 that constitutes the first die block side resin flow channel RP1 of the molten resin and the first die block side manifold portion are provided in the first die block 350A. 3161 and the first die block side where the molten resin widened by the first die block side manifold section 3161 is circulated and the circulated molten resin is joined to the connection portion CN of the main land channel 317M and the lip channel 318. The land portion flow path 3171 is formed.

Specifically, the first die block side introduction flow path 3151 that communicates with the first die block side introduction port 3111 of the rear end portion 310RE is formed on the first die block side of the T die body 310A.
The first die block side introduction flow path 3151 is a flow path for introducing the molten resin fed from the first die block side introduction port 3111 into the first die block side manifold portion 3161.
A first die block side manifold portion 3161 communicating with the first die block side introduction flow path 3151 is formed in front of the first die block side introduction flow path 3151. The first die block side manifold portion 3161 widens the introduced molten resin in the width direction (X direction).

Further, a first die block side land portion flow path 3171 communicating with the first die block side manifold portion 3161 is formed at the tip of the first die block side manifold portion 3161.
The first die block side land channel 3171 is a channel for reducing the thickness in the Z direction of the molten resin expanded in the first die block side manifold section 3161.
The first die block side land portion flow channel 3171 has a flat portion 31711 that allows the molten resin expanded in the first die block side manifold portion 3161 to flow for a predetermined distance in the Y direction (the flowing direction of the molten resin in the T die body 310A). In order to convey the molten resin from the tip of the flat portion 31711 to the connecting portion CN of the main land channel 317M and the lip channel 318 so as to join the molten resin, it is inclined downward to the left in the front in FIG. It is composed of the formed inclined portion 31712.

  Furthermore, in the T die main body 310A, a second die block side introduction flow path 3152 forming a second die block side resin flow path RP2 of molten resin and a second die block side manifold in the second die block 360A. The second die block that circulates the molten resin widened by the portion 3162 and the second die block side manifold portion 3162 and joins the circulated molten resin to the connection portion CN between the main land channel 317M and the lip channel 318. The side land portion flow path 3172 is formed.

Specifically, the second die block side introduction flow path 3152 that communicates with the second die block side introduction port 3112 of the rear end portion 310RE is formed on the second die block side of the T die body 310A.
The second die block side introduction flow path 3152 is a flow path for introducing the molten resin fed from the second die block side introduction port 3112 into the second die block side manifold portion 3162.
A second die block side manifold portion 3162 communicating with the second die block side introduction flow path 3152 is formed in front of the second die block side introduction flow path 3152. The second die block side manifold portion 3162 widens the introduced molten resin in the width direction (X direction).

Further, a second die block side land portion flow path 3172 communicating with the second die block side manifold portion 3162 is formed at the tip of the second die block side manifold portion 3162.
The second die block side land portion channel 3172 is a channel for reducing the thickness in the Z direction of the molten resin widened in the second die block side manifold portion 3162.
The second die block side land portion flow path 3172 includes a flat portion 31721 that allows the molten resin expanded in the second die block side manifold portion 3162 to flow for a predetermined distance in the Y direction, and a main land portion flow from the tip of the flat portion 31721. In order to convey and join the molten resin to the connection portion CN between the passage 317M and the lip portion flow passage 318, the inclined portion 31722 is formed by inclining upward in the diagonally left forward direction in FIG. .

  As described above, the molten resin widened by the first die block side manifold portion 3161 is circulated in the connection portion CN between the main land portion flow path 317M and the lip portion flow path 318, and the circulated molten resin is passed through the main land portion flow path. The first die block side land channel 3171 that joins the connection portion CN between the channel 317M and the lip channel 318 is connected, and the molten resin widened by the second die block side manifold portion 3162 is circulated. The second die block side land portion channel 3172 that joins the melted resin to the connection portion CN of the main land portion channel 317M and the lip portion channel 318 is connected.

FIG. 26 shows a first schematic configuration example of the pressing plate arranged in the lateral sealing mechanism according to the modified example of the present invention.
FIG. 27 shows a second schematic configuration example of the pressing plate arranged in the lateral sealing mechanism according to the modified example of the present invention.
The configuration of FIG. 26 is different from the configuration of FIG. 27 in that a protrusion preventing portion 330A is formed corresponding to the first die block side land channel 3171 and the second die block side land channel 3172. Only the end shape in the flat portion of the recess is provided.
Specifically, in the configuration of FIG. 26, the end of the recess is formed in a straight line shape, but in the configuration of FIG. 27, the end of the recess is formed in a step shape.

In this modified example, the lateral sealing mechanism 320A basically has the same functions as the packing and the protrusion preventing portion described above, although the shape is different.
That is, the lateral sealing mechanism 320A is formed in a thin plate shape, and has a main land channel 317M and a lip channel 318, and a first die block side land channel 3171 and a second die block side land channel. It has a flow path surface (FC11) facing 3172 and a counter flow path surface (FC12) opposite to the flow path surface (FC11), and the flow path surfaces are the side surface of the first die block 350A and the side surface of the second die block 360A. And the side surface of the main land portion flow path 317M, the side of the lip portion flow path 318, and the first die block side land portion flow path 3171. It has a packing (not shown) that closes the sides and the sides of the second die block side land portion channel 3172.
Further, the side sealing mechanism 320A allows the packing to deform toward the side opposite to the flow path surface (FC12), so that the space between the inner surface of the first die block 350A and the inner surface of the second die block 360A, and The first die block side land passage 3171 and the second die block side land passage 3172 have a protrusion preventing portion 330A for preventing deformation of the packing.
In particular, a protrusion preventing portion 330A is provided between the inner surface of the first die block 350A and the inner surface of the second die block 360A, and particularly in the lip channel 318 to prevent deformation of the packing.

  As described above, the lateral sealing mechanism 320A is provided with the protrusion preventing portion 330A. The protrusion preventing portion 330A is configured by a recess 331A provided on the pressing surface FC21A of the pressing plate 322-1A.

The recess 331A serving as the protrusion preventing portion 330A includes the flow path side exposed portion PE, that is, the main land flow path 317M, the lip flow path 318, the side of the first die block side land flow path 3171 and the second side. In accordance with the shape of the die block side land channel 3172, it is formed on the pressing surface FC21A of the pressing plate 322-1A that faces and abuts the non-channel surface (FC12) of the packing (321).
Then, when the pressing surface 322-1A of the pressing plate 322-1A is brought into contact with the non-flow passage surface of the packing, the space SPC is formed in the recess of the recess 331A.

As in the case of the T die 300 described above, by applying the “holding plate has a groove portion” lateral sealing mechanism 320A according to the present invention, in association with FIG. 11 (B) and FIG. 13, the flow path surface FC11 of the packing 321 can be The digging out (biting in) was eliminated, and as shown in FIGS. 11B and 13, dents were found in the flow path surface FC11.
Then, by applying the modified example of the present invention, in association with FIG. 11B and FIG. 14, it was confirmed that the packing 321 was deformed toward the non-flow passage surface FC12 side. As described above, this is considered to be connected to the suppression of the sticking out (cutting in) of the packing, which is supposed to stick out (cutting into) the lip flow path 318.

As described above, by forming the recessed portion 331A as a groove on the pressing plate 322-1A, the packing is deformed to the side opposite to the flow path surface FC12, and the sticking out (cutting into) of the packing into the lip portion flow path 318 is eliminated. As a result, the adjustment bolt 319 during the adjustment of the lip gap 314 also smoothly rotates, and the operability of the T die 300A is improved.
Further, since there is no biting of the packing, it is possible to prevent the packing from coming off easily and the like, and there is an advantage that the packing is not complicated and the packing can be easily replaced.

  FIG. 28 is a perspective view of another schematic configuration of a multi-manifold type T-die main body according to a modification of the present invention.

In the T dies 300 and 300A described above, the lip gap 314 is adjusted by moving the movable lip 312 by pushing and pulling the movable lip 312 with a plurality of adjusting bolts 319 provided in the width direction of the T die body 310. Then, the position of the movable lip 312 with respect to the fixed lip 313 is adjusted in the width direction so that the molten resin is uniformly discharged.
In the modification of FIG. 28, in addition to adjusting the position of the movable lip 312 with respect to the fixed lip 313 in the width direction, the thickness of the flat portion 31711 of the first die block side land channel 3171 is set to the T die main body. A plurality of adjusting bolts 3191 and a flow velocity adjusting choke bar 381 are provided in the width direction of 310B to adjust the width in the width direction, and the thickness of the flat portion 31721 of the second die block side land passage 3172 is set to the T die. A plurality of adjusting bolts 3192 and a flow velocity adjusting choke bar 382 provided in the width direction of the main body 310B are configured to adjust in the width direction. The choke bar includes a vertical choke bar and an oblique choke bar, and the vertical choke bar is illustrated in FIG. 28.

  As a result, the molten resin is adjusted so as to flow evenly in thickness, and the molten resin can be discharged more uniformly.

In the modification of FIG. 28, as described above, the flat portions 31711, corresponding to the flat portions 31711 of the first die block side land channel 3171 and the flat portions 31721 of the second die block side land channel 3172. 31721 has a protrusion preventing portion 330A that prevents the deformation of the packing.
More specifically, by forming the recess 331A as a groove on the pressing plate 322-1A, the packing is deformed to the side opposite to the flow path surface FC12, and the digging (cutting) of the packing into the flat portions 31711 and 31721 is caused. As a result, the adjustment bolt 3192 is smoothly rotated when adjusting the thickness of the flat portions 31711 and 31721, and the operability of the T die 300B can be improved.
Further, since there is no biting of the packing, it is possible to prevent the packing from coming off easily and the like, and there is an advantage that the packing is not complicated and the packing can be easily replaced.

[Other modifications]
In the above-described embodiment, the T-die body 310 is a split die formed by stacking two die blocks (the first die block 350 and the second die block 360). The main body 310 may be a three-piece die including three members.
In the case of a three-divided die, the T-die main body 310 is attached to the die base portion in which the introduction port, the introduction flow passage, and the manifold portion are formed and the land portion flow passage 317 and the lip portion flow passage 318, respectively. It has two die blocks. The first die block 350 and the second die block 360 may be applied to these two die blocks.
Further, in the above-described embodiment, the T die 300 is a single-layer die for manufacturing a single-layer sheet, but instead of this, the T-die 300 may be a multi-layer die (multi-manifold die) for manufacturing a multi-layer sheet. Good.

  The embodiments and examples disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present disclosure is shown not by the above description but by the claims, and is intended to include all modifications within the meaning and range equivalent to the claims.

100 ... Sheet / film manufacturing apparatus, 300, 300A, 300B ... T die, 310, 310A, 310B ... T die body,
312 ... Movable lip, 313 ... Fixed lip, 314 ... Lip gap,
316 ... Manifold section, 317 ... Land section channel, 318 ... Lip section channel,
316M ... Main manifold part, 317M ... Main land part flow path, 3171 ... First die block side land part flow path, 31711 ... Flat part, 31712 ... Inclined part, 3172 ... Second die block side land part flow path, 31721 ... Flat part, 31722 ... inclined part,
320, 320A ... Lateral sealing mechanism, 321 ... Packing, 322 ... Pressing member,
322-1, 322-1A ... pressing plate, 322-2 ... receiving plate, 323 ... side plate,
324 ... Set screw, 330.330A ... Protrusion prevention part, 331, 331A ... Recessed part,
332 ... Groove portion, 350, 350A ... First die block, 360, 360A ... Second die block

Claims (17)

A T-die that expands the introduced molten resin in the width direction in a manifold part and discharges it in a sheet shape or a film shape from a lip gap,
The first die block and the second die block are opposed to each other, and the land portion flow path and the lip portion flow in which the molten resin flows are provided between the inner surface of the first die block and the inner surface of the second die block which face each other. A T-die body with a channel formed,
It is attached to the side surface of the T-die main body including the side surface of the first die block and the side surface of the second die block, and the side portion of the land portion channel and the side portion of the lip portion channel are attached. It has a side sealing mechanism for sealing,
The lateral sealing mechanism is formed in a thin plate and has a flow path surface facing the land flow path and the lip flow path, and a non-flow path surface opposite to the flow path surface. Is abutted and pressed across the side surface of the first die block and the side surface of the second die block, so that the flow path surface extends laterally of the land flow path and lateral side of the lip flow path. With packing to close,
A protrusion that prevents the packing from deforming between the inner surface of the first die block and the inner surface of the second die block by allowing the packing to deform toward the side opposite to the flow path surface. A T-die including a prevention unit. The lateral sealing mechanism includes a pressing member having a pressing surface that abuts and presses against the non-flow passage surface of the packing,
The T-die according to claim 1, wherein the protrusion preventing portion is a concave portion that is provided on a pressing surface of the pressing member and that forms a space that accommodates a deformed portion of the packing. The T-die according to claim 2, wherein the recess is a groove formed on a surface opposite to the pressing surface of the pressing member. The lateral sealing mechanism includes a pressing member having a pressing surface that abuts and presses against the non-flow passage surface of the packing,
The T-die according to claim 1, wherein the protrusion preventing portion is a concave portion that is provided on a non-flow passage surface of the packing and that forms a space that accommodates a deformed portion of the packing. The lateral sealing mechanism includes a pair of side plates attached to a side surface of the first die block and a side surface of the second die block, respectively.
The pressing member has a pressing plate having the pressing surface and a receiving plate locked to the pair of side plates,
5. The packing is pressed across the side surface of the first die block and the side surface of the second die block via the pressing plate by screwing a set screw from the receiving plate. Item 1. The T-die according to item 1. The lateral sealing mechanism includes a side plate attached across a side surface of the first die block and a side surface of the second die block,
The side plate has a recess for accommodating the packing and the pressing member on an abutting surface that abuts a side surface of the first die block and a side surface of the second die block,
5. The packing is pressed across the side surface of the first die block and the side surface of the second die block via the pressing member by screwing a set screw from the side plate. Item 1. The T-die according to item 1.   A sheet / film manufacturing apparatus comprising the T-die according to any one of claims 1 to 6. A T-die that expands the introduced molten resin in the width direction in a plurality of manifold parts, joins the expanded molten resin into a main flow path, and discharges the sheet-like or film-like from a lip gap,
A main die having a first die block and a second die block that face each other, and flowing a molten resin widened by a main manifold portion between at least the inner surface of the first die block and the inner surface of the second die block that face each other; A T-die body in which a land channel and a lip channel are formed;
It is attached to the side surface of the T-die main body including the side surface of the first die block and the side surface of the second die block, and is at least on the side of the main land channel and the side of the lip channel. It has a side sealing mechanism that seals one side,
The T-die body is
In the first die block, a first die block side manifold portion and a molten resin widened by the first die block side manifold portion are circulated, and the circulated molten resin is flown into the main land channel and the lip portion. A first die block side land portion flow channel that merges with a connection portion of the flow channel,
A second die block side manifold portion and a molten resin widened by the second die block side manifold portion are circulated in the second die block, and the circulated molten resin is flown through the main land portion flow path and the lip portion. A second die block side land portion flow channel that merges with the connection portion of the flow channel,
The lateral sealing mechanism is formed in a thin plate shape, and is provided in the main land part flow path and the lip part flow path, and the first die block side land part flow path and the second die block side land part flow path. A flow path surface facing the flow path surface and an opposite flow path surface opposite to the flow path surface, and the flow path surface is pressed against the side surface of the first die block and the side surface of the second die block while contacting and As a result, the flow path surface is lateral to the main land flow path and lateral to the lip flow path, and lateral to the first die block side land flow path and the second die block side land part. Packing that blocks the side of the flow path,
By allowing the packing to deform toward the side opposite to the flow path surface, the space between the inner surface of the first die block and the inner surface of the second die block, and the land portion flow path on the first die block side and the first die block side 2 die block side land part flow path, at least between the inner surface of the first die block and the inner surface of the second die block, a protrusion preventing portion for preventing deformation of the packing protruding T Die. At least one of the first die block side land flow path and the second die block side land flow path is flat for allowing the molten resin expanded in the corresponding manifold part to flow for a predetermined distance in the flow direction of the die. Including parts,
The flat portion is
A choke bar for flow velocity adjustment is attached,
The side sealing mechanism is
9. A protrusion preventing portion for preventing deformation of the packing protruding to at least the flat portion of the first die block side land flow passage and the second die block side land flow passage. The listed T-die. The lateral sealing mechanism includes a pressing member having a pressing surface that abuts and presses against the non-flow passage surface of the packing,
The T die according to claim 8 or 9, wherein the protrusion preventing portion is a concave portion that is provided on the pressing surface of the pressing member and that forms a space that accommodates the deformed portion of the packing. The T-die according to claim 10, wherein the recess is a groove formed on a surface opposite to the pressing surface of the pressing member. The lateral sealing mechanism includes a pressing member having a pressing surface that abuts and presses against the non-flow passage surface of the packing,
9. The T-die according to claim 8, wherein the protrusion preventing portion is a concave portion that is provided on the non-flow passage surface of the packing and that forms a space that accommodates a deformed portion of the packing. The lateral sealing mechanism includes a pair of side plates attached to a side surface of the first die block and a side surface of the second die block, respectively.
The pressing member has a pressing plate having the pressing surface and a receiving plate locked to the pair of side plates,
13. The packing is pressed across the side surface of the first die block and the side surface of the second die block via the pressing plate by screwing a set screw from the receiving plate. Item 1. The T-die according to item 1. The lateral sealing mechanism includes a side plate attached across a side surface of the first die block and a side surface of the second die block,
The side plate has a recess for accommodating the packing and the pressing member on an abutting surface that abuts a side surface of the first die block and a side surface of the second die block,
13. The packing is urged across the side surface of the first die block and the side surface of the second die block via the pressing member by screwing a set screw from the side plate. Item 1. The T-die according to item 1.   A sheet / film manufacturing apparatus comprising the T-die according to claim 8. The first die block and the second die block are opposed to each other, and the land portion flow path and the lip portion flow in which the molten resin flows are provided between the inner surface of the first die block and the inner surface of the second die block which face each other. A side face of the first die block and a side face of the second die block of the T die for forming a passage and widening the introduced molten resin in the width direction in the manifold portion and discharging it in a sheet shape or a film shape from the lip gap. A packing for T-die that is attached to the side surface of a T-die main body including
It is formed in a thin plate, and has a flow path surface facing the land flow path and the lip flow path, and a non-flow path surface opposite to the flow path surface, and the flow path surface is the first die block. By being pressed against the side surface and the side surface of the second die block while being in contact with each other, the flow path surface closes the side of the land flow path and the side of the lip flow path, so that the opposite flow path surface is formed. Packing for T-die with a recess. The first die block and the second die block are opposed to each other, and the land portion flow path and the lip portion flow in which the molten resin flows are provided between the inner surface of the first die block and the inner surface of the second die block which face each other. A side face of the first die block and a side face of the second die block of the T die for forming a passage and widening the introduced molten resin in the width direction in the manifold portion and discharging it in a sheet shape or a film shape from the lip gap. A side sealing mechanism attached to a side surface of a T-die main body including
It is formed in a thin plate, and has a flow path surface facing the land flow path and the lip flow path, and a non-flow path surface opposite to the flow path surface, and the flow path surface is the first die block. A packing in which the flow path surface closes the side of the land flow path and the side of the lip flow path by being pressed against the side surface and the side surface of the second die block while being in contact with each other,
A protrusion that prevents the packing from deforming between the inner surface of the first die block and the inner surface of the second die block by allowing the packing to deform toward the side opposite to the flow path surface. Lateral sealing mechanism including prevention part.

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