TWI793383B - T-die, liner for T-die, side sealing mechanism, and sheet and film manufacturing equipment - Google Patents

Abstract

The present invention is to provide a T-shaped mold, a liner for the T-shaped mold, a side sealing mechanism, and a sheet and film manufacturing device, which can prevent resin from leaking from the side of the T-shaped mold body, and can adjust the lip gap. Suppression: Squeeze out (intrusion) into the flow path accompanied by gasket deformation that becomes an obstacle factor can improve operability. The T-shaped mold of the present invention includes: a T-shaped mold body, between the inner surfaces of the first module and the inner surface of the second module facing each other, a flow path and a mold clamping surface flow path for molten resin to flow are formed. The lip flow path and the side sealing mechanism are installed on: the side of the T-shaped mold body to seal the side of the flow path on the mold clamping face and the side of the lip flow path; the side sealing mechanism, It consists of a liner that blocks the flow path from the side of the flow path on the clamping surface and the side of the flow path from the die lip, and an extrusion prevention portion that deforms by allowing the liner to face the side of the back flow path , to prevent deformation of the liner towards extrusion between the inner surface of the first module and the inner surface of the second module.

Description

T-die, liner for T-die, side sealing mechanism, and sheet and film manufacturing equipment

The present invention relates to a T-die that expands molten resin fed from an extruder and discharges it in the form of a sheet or a film, a gasket for a T-die attached to the T-die, a side sealing mechanism, and Sheet and film manufacturing equipment using this T-die. In particular, it relates to improvements to prevent resin leakage from the T-die and to improve the operability of the T-die.

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

Here, the conventional T-die 1 will be described. FIG. 1 is a schematic configuration diagram showing a conventional T-die 1 . Also, the width direction of the T-die 1 is defined as the X direction, the flow direction of the molten resin in the T-shaped die 1 is defined as the Y direction, and the thickness direction of the molten resin in the T-shaped die 1 is defined as the Z direction, and a rectangular coordinate system is set. .

The T-die 1 is configured to include a T-die body 10 . In the T-die main body 10 , an introduction port 11 for molten resin is provided on the upstream side in the flowing direction (Y direction) of the molten resin. Further, on the downstream side, a slit-shaped lip gap (discharge port) 12 is provided along the width direction (X direction). The supplied molten resin is expanded by the manifold part 14 through the inlet 11 and the flow path 13 . The widened molten resin further passes through the flow channel 15 and is discharged in a sheet or film form from the lip gap 12 between the movable lip 16 and the fixed lip 17 .

In the T-die 1 , adjustment of the lip gap 12 is an indispensable operation in order to discharge the molten resin widened by the manifold portion 14 uniformly in the width direction in a sheet or film form. Therefore, the position of the movable lip 16 relative to the fixed lip 17 is adjusted in the width direction by pushing and pulling the movable lip 16 with a plurality of adjustment bolts 18 provided in the width direction, and the molten resin is uniformly discharged.

When the flow path 15 of the molten resin is formed inside the T-die body 10, as shown in FIG. . In this case, the gasket 19 is screwed into the set screw 22 that is screwed into the side plate 21 and penetrates the side plate 21, so that it is pressed against the side surface 10s exposed on the side of the flow path 15 through the pressing plate 20. up and fixed. [Prior Art Literature] [Patent Document]

Patent Document 1: Japanese Publication No. 63-170120

[Problem to be solved by the invention]

However, in the above-mentioned conventional fixing method, when the set screw 22 is pressed, the gasket 19 may be deformed and extrude toward the flow path 15 (cause intrusion), which is called extrusion (intrusion). Therefore, when the lip gap 12 is adjusted, operability at both ends in the width direction of the movable lip 16 may be hindered. In particular, when the adjusting bolt 18 is operated in a direction to narrow the lip gap 12, the operability may be hindered. This is considered to be due to strong extrusion of the portion caused by 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.

The present invention is to provide a T-die, a liner for the T-die, a side sealing mechanism, and a sheet and film manufacturing device, which can prevent resin from leaking from the side of the T-die body, and for the adjustment of the lip gap Therefore, it is possible to suppress extrusion (invasion) into the flow path accompanying deformation of the gasket which is a hindrance factor, and to improve operability. [Technical means to solve the problem]

The T-die according to the first aspect of the present invention is a T-die that expands the introduced molten resin in the width direction by a manifold portion and discharges it in a sheet or film form from the gap between the die lips, and has: T-shaped The mold body has a first block and a second block facing each other. Between the inner surfaces of the first block and the second block facing each other, there are formed a mold clamping surface flow path for molten resin to circulate and The flow path of the die lip and the side sealing mechanism are installed on the side of the T-shaped mold body composed of the side of the first module and the side of the second module, so as to seal the flow of the clamping surface The side of the channel and the side of the flow path of the aforementioned die lip are sealed; the aforementioned side sealing mechanism includes: a liner and an extrusion prevention part; the liner is formed into a thin plate shape, and has a The flow path surfaces of the surface flow path and the lip flow path, and the back flow path surface on the opposite side to the flow path surface are formed by making the flow path surface straddle the side surfaces of the first block and the second block, And press against the side of the first module and the side of the second module, so that the flow path will block the side of the flow path of the mold clamping surface and the side of the flow path of the lip part; the anti-crowding The outlet portion prevents deformation of the gasket from extrusion between the inner surface of the first module and the inner surface of the second module by allowing the gasket to deform toward the side of the back flow path.

In addition, in the T-die according to the first aspect of the present invention, the introduced molten resin is widened in the width direction by using a plurality of manifold parts, and the widened molten resin is merged in the main flow path, and then flows from the lip The T-shaped mold whose gap is extruded in the shape of a sheet or film is characterized by: a T-shaped mold body, which has a first module and a second module facing each other, at least on the inner surface of the first module facing each other and the inner surface of the first module. Between the inner surfaces of the second block, there are formed: the flow path of the main clamping surface and the flow path of the lip part through which the molten resin expanded by the main manifold part flows, and the side sealing mechanism is installed on the : The side surface of the aforementioned T-shaped mold body composed of the side surface of the aforementioned first module and the side surface of the aforementioned second module, at least the side of the flow path of the main clamping surface and the side of the flow path of the aforementioned die lip airtight; the aforementioned T-shaped mold body is tied in the aforementioned first module, forming: the first module side manifold part and the first module side mold closing surface flow path; the aforementioned first module side mold closing surface flow path is to make The molten resin widened by the first module side manifold part is circulated, and the circulating molten resin is merged at the connecting part of the main parting surface flow path and the lip part flow path; and at the second In the module, there are formed: the second module side manifold part and the second module side mold closing surface flow path; the second module side mold closing surface flow path is made by widening the second module side manifold part The molten resin is circulated, and the molten resin is merged at the connecting portion of the aforementioned main clamping surface flow path and the aforementioned die lip flow path; the aforementioned side sealing mechanism includes: a gasket, and an extrusion preventing portion; The gasket is formed in a thin plate shape and has a flow facing the main clamping surface flow path, the lip portion flow path, the first module side clamping surface flow path, and the second module side clamping surface flow path. The road surface and the back flow road surface on the opposite side to the flow path surface are made to straddle the side surfaces of the first module and the side surfaces of the second module, and press the side surfaces of the first module in abutting manner. and the side surface of the second module, the flow path surface connects the side of the main clamping face flow path, the side of the lip portion flow path, the side of the first module side clamping face flow path, and the The side of the flow path of the clamping surface on the side of the second module is blocked; the extrusion prevention part prevents the gasket from moving toward the inner surface of the first module and the inner surface of the first module by allowing the gasket to deform toward the side of the back flow path. Between the inner surfaces of the second block, and at least the inner surface of the first block and the inner surface of the second block in the first block side clamping surface flow path and the second block side clamping face flow path Between extrusion deformation.

A sheet and film manufacturing apparatus according to a second aspect of the present invention is provided with the T-die of the first aspect.

The liner for the T-shaped mold according to the third aspect of the present invention is a liner for the T-shaped mold installed on the side of the T-shaped mold body; the T-shaped mold body has a first module and a second module facing each other. Between the inner surface of the first block and the inner surface of the second block facing each other, there are formed a mold clamping surface flow path and a lip portion flow path through which the molten resin flows, and the molten resin introduced by the manifold portion It widens toward the width direction and is extruded in a sheet or film form from the die lip gap; the side of the aforementioned T-shaped mold body is composed of the side of the aforementioned first module and the side of the aforementioned second module; the lining for the aforementioned T-shaped mold The pad is formed in a thin plate shape, has a flow path surface facing the flow path of the clamping surface and the flow path of the lip part, and a back flow path surface opposite to the flow path surface. The side of the first module and the side of the second module are pressed against the side of the first module and the side of the second module, so that the flow path surface connects the side of the flow path of the mold clamping surface and the side of the mold The side of the flow path of the lip is blocked, and a recess is formed on the surface of the back flow path.

The side airtight mechanism of the fourth viewpoint of the present invention is a side airtight mechanism installed on the side of the T-shaped mold body; the T-shaped mold body has a first module and a second module facing each other. Between the inner surface of the first block and the inner surface of the second block, there are formed a mold clamping surface flow path and a lip portion flow path through which the molten resin flows, and the molten resin introduced is expanded in the width direction by the manifold portion. It is wide and spits out in the shape of a sheet or film from the gap between the die lips; the side of the aforementioned T-shaped mold body is composed of the side of the aforementioned first module and the side of the aforementioned second module; the aforementioned side sealing mechanism includes: lining A gasket and an extrusion preventing portion; the gasket is formed in a thin plate shape and has a flow path surface facing the flow path of the clamping surface and the flow path of the die lip, and a back flow path surface opposite to the flow path surface, By making the flow path surface straddle the side of the first module and the side of the second module, and press against the side of the first module and the side of the second module in abutting manner, the flow path surface will The side of the flow path on the die surface and the side of the flow path of the die lip are blocked; the extrusion preventing portion prevents the liner from moving toward the first side by allowing the liner to deform toward the back flow path side. Deformation of extrusion between the inner surface of the module and the inner surface of the aforementioned second module. [Invention effect]

According to the present invention, it is possible to prevent the resin from leaking from the side of the T-die main body, and it is also possible to suppress the extrusion (intrusion) into the flow path accompanying the deformation of the liner, which is an obstructive factor, for the adjustment of the lip gap. The operability of the T-die has been improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[Overview of Sheet and Film Manufacturing Apparatus 100] FIG. 3 shows the structure of a sheet and film manufacturing apparatus 100 according to an embodiment of the present invention.

The sheet and film manufacturing apparatus 100 of the present embodiment includes an extruder 200 , a T-die 300 , a casting machine 400 , a thickness gauge 500 , a tractor 600 , and a winder 700 .

The extruder 200 is a device that plasticizes and extrudes resin, melts and kneads the supplied granular or powdery resin to form a molten resin, and extrudes toward the T-die 300 disposed at the front end. In addition, additives and the like may be blended into the resin supplied to the extruder 200 .

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

The sheet-like or film-like molten resin 800 is cooled and solidified by the casting machine 400 to form a sheet or a film. After the thickness of the sheet or film is measured by the thickness gauge 500 , it is trimmed (trimming) by the hauler 600 , and finally wound by the winder 700 .

In the sheet and film manufacturing apparatus 100 having such a structure, the T-shaped mold 300 has a characteristic structure in the installation structure of the gasket, and as described in detail below, it is configured to prevent resin leakage and utilize the side The anti-extrusion portion of the sealing mechanism suppresses extrusion (intrusion) into the flow path accompanying the deformation of the liner which is an obstacle factor for the adjustment of the lip gap, and improves the operability of the T-die 300 .

Hereinafter, the sheet and film manufacturing apparatus 100 will be referred to simply as the sheet manufacturing apparatus 100 , and the sheet or film will be simply referred to as a sheet for description.

[About the structure of T-die 300] FIG. 4 shows a schematic structure of a T-die 300 of this embodiment. Moreover, in this embodiment, in each drawing, the width direction of the T-die 300 is defined as the X direction, the flowing direction of the molten resin in the T-die 300 is defined as the Y direction, and the flow direction of the molten resin in the T-die 300 is defined as The thickness direction of the resin is defined as the Z direction, and a Cartesian coordinate system is set.

The T-die 300 is configured to include a T-die body 310 and a side sealing mechanism 320 . Also, the side sealing mechanisms 320 are respectively arranged at both ends in the width direction of the T-shaped die body 310, but since both mechanisms have the same structure, only the side of one end is shown in FIG. 4 . The sealing mechanism 320 and the side sealing mechanism at the other end are omitted together with a part of the T-die body 310 .

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

The T-die body 310 is configured with a first module 350 and a second module 360 . The first block 350 is provided with the aforementioned movable lip 312 at the front end of the block body 351 . A thin neck portion 352 is provided between the movable lip 312 and the block body 351 . In other words, the movable lip 312 is integrally connected to the block main body 351 via the thin neck portion 352 . The second block 360 is integrally provided with the above-mentioned fixed lip 313 at the front end of the block body 361 .

Furthermore, the T-die body 310 is configured such that the first block 350 and the second block 360 are overlapped via opposing inner surfaces 350R, 360R, and are connected and fixed to each other by a plurality of bolts not shown. In other words, the T-die body 310 is configured such that the first block 350 and the second block 360 make the opposing inner surfaces 350R, 360R abut against each other, and are firmly locked to each other by a plurality of bolts not shown. In addition, the first block 350 and the second block 360 are overlapped and fixed so that the movable lip 312 and the fixed lip 313 face each other, and the block main body 351 and the block main body 361 face each other.

The inner surface 350R of the first block 350 and the inner surface 360R of the second block 360 are overlapped and fixed, and are provided with recesses (recesses, dimples, grooves) for forming gaps as the resin flow paths RP. The introduction flow path 315 constituting the resin flow path RP of the molten resin, the manifold portion 316 , the clamping surface portion flow path 317 , and the lip portion flow path 318 are formed inside the T-die main body 310 by the concave portion.

Specifically, an introduction flow path 315 communicating with the introduction port 311 of the rear end portion 310RE is formed inside the T-die main body 310 . The introduction flow path 315 is a flow path for introducing the molten resin fed in from the introduction port 311 to the manifold portion 316 . A manifold portion 316 communicating with the introduction flow path 315 is formed at the front end of the introduction flow path 315 . The manifold portion 316 expands the introduced molten resin in the width direction (X direction).

Furthermore, at the front end of the manifold part 316, a mold clamping surface flow path 317 communicating with the manifold part 316 is formed. The clamping surface portion flow path 317 is a flow path for reducing the thickness in the Z direction of the molten resin widened by the manifold portion 316 . The mold clamping surface flow path 317 is formed in the range from the outlet of the manifold part 316 to the front of the movable lip 312 .

Furthermore, a lip portion flow path 318 communicating with the clamping surface portion flow path 317 is formed at the front end of the clamping portion portion flow path 317 . The lip 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 tip of the lip channel 318 communicates with the lip gap 314 . In addition, the adjustment of thickness unevenness is mentioned later.

Thus, the molten resin introduced 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, and after being widened by the manifold portion 316, it is Thinning while flowing through the channel 317 of the mold clamping surface, adjusting the thickness unevenness while continuing to flow through the channel 318 of the lip part, and discharging in a thin sheet from the lip gap 314 at the front end part 310TP of the T-die body 310 .

In the T-die 300 , when the molten resin is ejected in sheets from the lip gap 314 , adjustment of the lip gap 314 (adjustment of the movable lip 312 ) is an indispensable operation in order to discharge the molten resin uniformly in the width direction. . The adjustment of the lip gap 314 is carried out as follows: the movable die lip 312 is moved by pushing and pulling the movable die lip 312 with a plurality of adjusting bolts 319 provided in the width direction of the T-shaped die body 310, and the movable die lip is adjusted in the width direction. The position of the lip 312 is fixed relative to the lip 313 so that the molten resin is evenly ejected.

In addition, in Fig. 4 and Fig. 5, the case where a plurality of adjusting bolts 319 are provided and the die lip gap 314 is manually adjusted is shown, but there is also a case where automatic adjustment is performed by providing a mechanism using thermal displacement or electric movement. Condition.

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

The side surface 310S of the T-die body 310 is configured to include side surfaces 350S, 360S facing the X direction (width direction) of the first block 350 and the second block 360 . The side (X direction) of the clamping surface flow path 317 and the lip portion flow path 318 formed between the inner surface 350R of the first block 350 and the inner surface 360R of the second block 360 between the side surface 350S and the side surface 360S. The side portion of the flow path) is opened and exposed, and a flow path side exposed portion PE is formed. The side sealing mechanism 320 seals the side exposed portion PE of the flow path in order to prevent resin from leaking from the side surface 310S during the molding operation.

The side sealing mechanism 320 is constituted by including a T-shaped die liner 321, a pressing member 322 (322-1, 322-2), a pair of side plates 323 (323-1, 323-2), a set screw 324, and an anti-crowding mechanism. Outlet 330 (FIG. 7). Hereinafter, the spacer 321 for a T-die will be simply referred to as the liner 321 for description.

A pair of side plates 323 - 1 and 323 - 2 are attached to the side surface 350S of the first module 350 and the side surface 360S of the second module 360 at intervals, respectively, so as to avoid the side exposed portion PE of the flow path. When installing the side plates 323 - 1 and 323 - 2 , it is better to securely lock them with bolts 370 .

In a state where the side plate 323-1 is attached to the side surface 350S of the first module 350 and the side plate 323-2 is attached to the side surface 360S of the second module 360, the side plates 323-1, 323-2 have separate and facing side surfaces 323-1S, respectively. , 323-2S. Furthermore, on the side plates 323-1, 323-2, at positions on the side opposite to the side surface 350S and the side surface 360S, convex portions 323-1T protruding from the side surfaces 323-1S, 323-2S in directions approaching each other are provided. , 323-2T.

The gasket 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, 323-2 are attached to the T-shaped die body 310. Specifically, it is accommodated in the side 350S of the first module 350, the side 360S of the second module 360, the side 323-1S of the side plate 323-1, the side 323-2S of the side plate 323-2, and the protrusion 323-1T and In the space surrounded by the convex part 323-2T.

The gasket 321 has a flow path surface FC11 facing the flow path side exposed portion PE and a back flow path surface FC12 opposite to the flow path surface FC11 . Furthermore, the gasket 321 is attached so that the flow path surface FC11 closes the flow path side exposed portion PE and abuts on the side surface 350S of the first module 350 and the side surface 360S of the second module 360 . In other words, the gasket 321 is attached so that the flow path surface FC11 abuts on the side surface FC11 across the side surface 350S and the side surface 360S, and covers the flow path side exposed portion PE.

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

As shown in FIG. 8 , the spacer 321 is formed longer in the Y direction, shorter in the Z direction, and thinner in the X direction. In the spacer 321 , the distance in the Y direction is represented by the length LD1 of the spacer 321 , the distance in the Z direction is represented by the width TD1 of the spacer 321 , and the distance in the X direction is represented by the thickness TC1 of the spacer 321 . For example, as an example, the spacer 321 is formed in a thin plate shape with a length LD1 of approximately 170 mm to 200 mm, a width TD1 of approximately 20 mm to 50 mm, and a thickness TC1 of approximately 2 to 5 mm. Furthermore, the front end portion 321TP is formed in a shape in which the width TD1 gradually decreases so as to follow the shape of the front end portion 310TP of the T-shaped die body 310 .

The pressing member 322 is configured to have a pressing plate 322-1 and a receiving plate 322-2. 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 similarly to the packing 321.

The pressing plate 322-1 has a pressing surface FC21 that contacts the back flow path surface FC12 of the gasket 321 to press the gasket 321 against the side surface 350S of the first module 350 and the side surface 360S of the second module 360, and a pressing surface FC21 that contacts the side surface FC12 of the gasket 321. The pressing opposite surface FC22 on the side opposite to the pressing surface FC21 is pressed. Further, the pressing plate 322-1 overlaps the packing 321 so that the pressing surface FC21 abuts on the back flow path surface FC12 of the packing 321, and is inserted between the pair of side plates 323-1, 323-2.

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

The pressing plate 322 - 1 is attached so as to overlap the spacer 321 , and therefore has substantially the same surface shape as the spacer 321 . That is, as shown in FIG. 9 , the pressing plate 322 - 1 is formed to be long in the Y direction and short in the Z direction. The pressing plate 322 - 1 is formed thicker than the thickness TC1 of the gasket 321 in the X direction. In the pressing plate 322-1, the distance in the Y direction is represented by the length LD2 of the pressing plate 322-1, the distance in the Z direction is represented by the width TD2 of the pressing plate 322-1, and the distance in the X direction is represented by the thickness of the pressing plate 322-1. TC2 said. For example, as an example, like the spacer 321 , the length LD2 is formed to be about 170 mm to 200 mm, the width TD2 is formed to be about 20 mm to 50 mm, and the thickness TC2 is formed to be thicker than the spacer 321 and is formed in a plate shape of about 5 to 10 mm. Furthermore, the front end portion 322TP is formed in a shape in which the width TD2 gradually decreases so as to follow the shape of the front end portion 310TP of the T-die main body 310 .

The receiving plate 322-2 is inserted between the protrusions 323-1T, 323-2T of the pair of side plates 323-1, 323-2 and the pressing plate 322-1. The receiving plate 322-2 is a member for pressing the gasket 321 against the side surface 350S of the first module 350 and the side surface 360S of the second module 360 via the pressing plate 322-1.

Specifically, a threaded hole 322-2H penetrating in the thickness direction (X direction) is formed in the receiving plate 322-2. If the set screw 324 is screwed into the threaded hole 322-2H from the convex portion 323-1T, 323-2T side toward the pressing plate 322-1 side, the front end of the set screw 324 passes through the receiving plate 322-2 and is in contact with the pressing plate 322-1. The anti-pressing surface FC22 of the plate 322-1 abuts against it. Since the side edge of the receiving plate 322-2 abuts against the protrusions 323-1T, 323-2T and is locked, if the set screw 324 is further screwed in, the front end of the set screw 324 presses the pressing plate 322- 1, whereby the gasket 321 is pressed against the side 350S of the first module 350 and the side 360S of the second module 360 .

The set screw 324 is installed in the Z direction so that the load center LDC coincides with the central portion CTR of the side exposed portion PE of the flow path, so that the gasket 321 is evenly pressed against the side surface 350S of the first module 350 and the side surface of the second module 360. On the side 360s. And, as shown in FIG. 10 , a plurality of set screws 324 ( 324 - 1 to 324 - 6 ) are arranged in a row at intervals in the Y direction.

In addition, in this embodiment, the manifold part 316 and the introduction flow path 315 are formed on the side surface 310S of the T-die main body 310 even if the lip gap 314 is adjusted (adjustment of the movable lip 312 ) by the adjustment bolt 319 . The state of the rear end portion 310RE side of the block main body 351 of the first module does not change (does not deform). Therefore, the side surface 310S is sealed by a member other than the gasket 321 . In the foregoing description, the numerical values of the length LD1 of the spacer 321 and the length LD2 of the pressing plate 322-1 indicate that the liner 321 blocks the flow path side exposed portion PE of the clamping surface flow path 317 and the lip portion flow path 318. An example below.

[About the structure of the extrusion prevention part 330] The side sealing mechanism 320 is provided with an extrusion prevention part 330 (FIG. 7, FIG. 9). The extrusion prevention part 330 is comprised by the recessed part 331 provided in the pressing surface FC21 of the pressing plate 322-1.

Here, when the extrusion prevention portion 330 is not formed on the pressing surface FC21 of the pressing plate 322-1, when the packing 321 is pressed by the set screw 324, the back flow path surface FC12 of the packing 321 is pressed. The surface FC21 restricts and suppresses the deformation of the back flow path surface FC12. Therefore, the flow path surface FC11 of the gasket 321 may squeeze out (invade) into the flow path 317 of the mold clamping surface and the flow path 318 of the lip part. ). Therefore, when the lip gap 314 is adjusted, operability at both ends in the width direction (X direction) of the movable lip 312 may be hindered. In particular, when the adjustment bolt 319 is operated in a direction to narrow the lip gap 314, the operability may be hindered. In order to suppress extrusion (invasion) of the flow path surface FC11 of the gasket 321, if the pressing force of the set screw 324 is weakened, resin leakage may occur during molding operation. The tight force compresses the liner 321 strongly.

Therefore, in the side sealing mechanism 320, as described above, by providing the concave portion 331 on the pressing surface FC21 of the pressing plate 322-1, resin is prevented from leaking from the side surface 310S of the T-die main body 310 during the molding operation. In addition, deformation of the flow path surface FC11 of the spacer 321 to be extruded (intruded) into the clamping surface portion flow path 317 and the lip portion flow path 318 is suppressed, thereby improving the operability of the T-die. In addition, the deformation of the flow path surface FC11 of the gasket 321 against the mold clamping surface flow path 317 and the lip portion flow path 318 (intrusion) means, in other words, the deformation of the flow path surface FC11 of the gasket 321 against the first die block 350. Deformation of extrusion (intrusion) between the inner surface 350R of the second module 360 and the inner surface 360R of the second module 360 .

The recessed portion 331 as the extrusion preventing portion 330 is formed on the pressing surface FC21 of the pressing plate 322 - 1 facing the back flow path surface FC12 of the gasket 321 in accordance with the shape of the flow path side exposed portion PE. A space SPC is formed in a depression of the concave portion 331 in a state where the pressing surface FC21 of the pressing plate 322 - 1 is brought into contact with the back flow path surface FC12 of the gasket 321 .

The recessed portion 331 of the pressing surface FC21 is constituted by a groove portion 332 provided by cutting this part of the pressing surface FC21. The groove portion 332 is disposed 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 in the X direction with the spacer 321 interposed therebetween.

The length LD21 of the groove portion 332 in the Y direction is set to be about 80 mm to 100 mm from the front end portion 322TP of the pressing plate 322-1 toward the rear end portion, compared to the length from the front end portion 310TP of the T-shaped die body 310 to the first module. The distance from the base of the thin neck portion 352 of 350 (the bending base point of the movable lip 312 ) has a margin of about 5 mm. In addition, the base portion of the neck portion 352 refers to the end portion on the rear end portion 310RE side of the neck portion 352 extending in the Y direction, and is a connection portion connected to the block main body 351 .

The width TD21 of the groove portion 332 in the Z direction is preferably set to be 0.5 mm to 2 mm wider on both sides, more preferably on both sides, based on the reference width WPE in the Z direction of the side exposed portion PE of the flow path. Each is set wider by 1mm. The Z-direction reference width WPE of the channel-side exposed portion PE refers to the Z-direction width of the channel-side exposed portion PE in the initial state before the lip gap 314 is adjusted by the adjusting bolt 319 . Furthermore, the depth DP21 of the groove portion 332 in the X direction is preferably set within a range of 0.5 mm to 2.0 mm.

[about the effect of one embodiment] According to the structure of the present embodiment, since the pressing surface FC21 of the pressing plate 322-1 that presses the gasket 321 against the side surface 350S of the first block 350 and the side surface 360S of the second block 360 is provided with the anti-extrusion portion 330 Therefore, the exposed portion PE on the side of the flow path forms an allowable space SPC that allows the gasket 321 to deform toward the rear flow path surface FC12 side. During the molding operation, the pressure of the molten resin flowing through the resin flow path RP acts on the gasket 321 toward the back flow path surface FC12 side, but the pressure generated by this pressure can be used without limitation. The deformation of the spacer 321 on the backflow path surface FC12 side is accommodated in the space SPC. Therefore, it is possible to prevent the resin from leaking from the side surface 310S of the T-die main body 310, and, with respect to the adjustment of the lip gap 314, suppress (prevent) the flow path 317 (318) accompanying the deformation of the liner 321 which becomes an obstacle factor. Extrusion (intrusion) improves the operability of the T-die 300 . In addition, the bottom surface of the groove portion 322 (recess 331 ) serves as a receiving surface that prevents excessive deformation of the gasket 321 .

Furthermore, by setting the width TD21 of the groove portion 332 (recess 331 ) to be wider than the reference width WPE of the lateral side exposure portion PE of the flow path, it is preferable to set the width 0.5 mm to 2 mm wider on both sides, and more preferably to set the width at both sides. Each side is set to be wider by 1 mm so that the packing 321 can be easily deformed toward the side opposite to the flow path when the resin pressure acts. In other words, with respect to the reference width WPE of the side exposed portion PE of the flow path, the margin width of the groove portion 332 is set to be 0.5 mm to 2 mm wider on both sides, and more preferably to be wider on both sides. Each setting is 1 mm so that the gasket 321 can be easily deformed toward the back flow path surface FC12 side when the resin pressure acts. Accordingly, it is possible to reliably suppress extrusion (intrusion) into the flow path accompanying deformation of the gasket, and further improve the operability of the T-die.

When installing the gasket 321, the margin width of the groove portion 332 (recess 331) is also set to be 0.5 mm to 2 mm wide on both sides, preferably 1 mm wide on both sides, so that when using When the pressing plate 322-1 is pressed, the packing 321 is easily deformed toward the back flow path surface FC12 side, and extrusion (intrusion) into the flow path is suppressed or relaxed, so adjustment before production operation becomes easy. Also, when the margin width is narrower than 0.5 mm, the ease of deformation of the packing 321 toward the back flow path surface FC12 side decreases, and correspondingly, the deformation toward the flow path surface FC12 side may increase. When the margin width is wider than 2.0 mm, molten resin may enter between the flow path surface FC11 of the gasket 321 and the side surfaces 350S of the first block 350 and the side surfaces 360S of the second block 360 during the molding operation.

[Demonstration Test Regarding Effects of One Embodiment] The side sealing mechanism 320 provided with the pressing plate 332-1 without the groove part 332 and the side sealing mechanism 320 provided with the pressing plate 332-1 provided with the groove part 332 were prepared. In other words, the side sealing mechanism 320 of the conventional article "without a groove on the pressing plate" and the side sealing mechanism 320 of the present invention "with a groove on the pressing plate" are prepared. Next, the two side sealing mechanisms 320 are attached to one side 310S and the other side 310S of the T-shaped mold body 310 . Then, using the sheet manufacturing apparatus 100 (test apparatus) in which the T-die 300 was set, a sheet manufacturing test was implemented using polypropylene resin as a raw material.

The dimensions of the pressing plate 332-1 provided with the groove portion 332 are as follows. The length LD2 of the pressing plate: 175mm Press plate width TD2: 30mm Thickness of pressing plate TC2: 8mm The length LD21 of the groove part: 90mm The width TD21 of the groove part: 6mm Groove margin width: 1mm on both sides Depth DP21 of groove: 1mm

Although the sheet manufacturing test was carried out for 15 hours, from the side surface 310S of the side sealing mechanism 320 equipped with "a groove on the pressing plate" and the side sealing mechanism 320 equipped with "no groove on the pressing plate", The side 310S did not produce resin leakage.

However, the adjustment of the lip gap 314 (adjustment of the movable lip 312) is performed during the sheet manufacturing test, and when the operation of narrowing the lip gap 314 is performed, the side sealing mechanism located "without a groove on the pressing plate" The rotation of the adjustment bolt 319 at the end on the 320 side is not smooth, whereas the rotation of the adjustment bolt 319 on the end of the side sealing mechanism 320 side "with a groove in the pressing plate" is smooth.

In addition, after the sheet manufacturing test was completed, the state of the aluminum spacer set in each side sealing mechanism 320 was investigated. FIG. 11(A) is a diagram schematically showing a deformed state of the gasket 321 set in the side sealing mechanism 320 of "no groove on the pressing plate" as a comparative example. Furthermore, FIG. 11(B) is a diagram schematically showing a deformed state of the packing 321 set in the side sealing mechanism 320 as "the groove portion is provided on the pressing plate" of the present invention.

12 is a graph showing a measurement curve obtained by actually measuring the displacement of the flow path surface FC11 of the gasket 321 in the comparative example. FIG. 13 is a graph showing measurement curves obtained by actually measuring the displacement of the flow path surface FC11 of the packing 321 in the present invention. FIG. 14 is a graph showing measurement curves obtained by actually measuring the displacement of the back flow path surface FC12 of the gasket 321 in the present invention.

According to FIG. 11(A) and FIG. 12 , in the comparative example using the side sealing mechanism 320 "without a groove on the pressing plate", large extrusion (invasion) occurs on the flow path surface FC11 of the gasket 321 This situation is confirmed. On the other hand, by applying the side sealing mechanism 320 which is the "groove on the pressing plate" of the present invention, as shown in FIG. 11(B) and FIG. (Invasion) was eliminated, and as shown in FIG. 11(B) and FIG. 13 , depressions were observed on the flow path surface FC11. Furthermore, by applying the present invention, as shown in FIG. 11(B) and FIG. 14 , the deformation of the gasket 321 toward the back flow path surface FC12 side was confirmed. This is considered to be related to the suppression of extrusion (intrusion) of the gasket that should have been extruded (intruded) into the flow path 317 ( 318 ).

As described above, by forming the groove portion 332 (recess 331) in the pressing plate 322-1, as a result, the packing 321 is deformed toward the back flow path surface FC12 side, and the extrusion of the packing 321 to the flow path 317 (318) (Intrusion) is eliminated, and the adjustment bolt 319 when adjusting the lip gap 314 is also rotated smoothly, and it can be seen that the operability of the T-die 300 is improved. In addition, the sheet production test can also be run without resin leakage. As a result, it was confirmed that the above-mentioned effect can be obtained by using the T-shaped die 300 equipped with the side sealing mechanism 320 of the present invention "with grooves on the pressing plate".

[Modified Example of the Extrusion Prevention Portion 330 ] In the above embodiment, the extrusion prevention part 330 is provided on the pressing surface FC21 of the pressing plate 322-1, but instead of the above structure, the extrusion prevention part 330 may be provided on the back flow path surface FC12 of the packing 321. As shown in FIGS. 15 to 17 , the anti-extrusion portion 330 of this modified example is formed on the back flow path surface FC12 of the packing 321, and the pressing surface FC21 of the pressing plate 322-1 is formed as a plane. A groove portion 332 (recess 331 ) having a length LD11 , a width TD11 , and a depth DP11 is provided on the back flow path surface FC12 of the gasket 321 as the extrusion preventing portion 330 . Moreover, length LD11, width TD11, and depth DP11 are the same dimension as said length LD21, width TD21, and depth DP21, respectively. Thereby, even in the conventional T-die, the extrusion preventing portion 330 can be formed without replacing the pressing plate.

Moreover, as shown in FIG. 18, the extrusion prevention part 330 may be provided in both the pressing plate 322-1 and the spacer 321. As shown in FIG. In addition, in the above-mentioned embodiment, the recessed part 331 (groove part 332) was provided by cutting the pressing surface FC21, but as shown in FIG. -12, 322-13, the narrow pressing plates 322-11, 322-12 are respectively overlapped on both sides of the wide pressing plate 322-13 to form the recess 331.

[Modified Example of Arrangement of Set Screw 324] In the above-described embodiment, the set screw 324 is attached so that the load center LDC in the Z direction coincides with the center portion CTR of the side exposed portion PE of the flow path. The central portion CTR of the portion PE is exposed, and set screws 324 are mounted at two locations. As shown in FIG. 20 , the set screws 324 of this modified example are attached to positions where the load center LDC is shifted in the Z direction from the center portion CTR of the flow path side exposed portion PE, for example, around the shoulder portion of the groove portion 332 (the so-called around the embankment). In this way, in the Z direction, the pressing force can be adjusted at two points and the pressing can be performed more uniformly.

And, as shown in FIG. 21 , a plurality of set screws 324 ( 324 - 21 to 324 - 112 ) are arranged in two rows at intervals in the Y direction. In addition, as shown in FIG. 22 , in the Y direction, a plurality of set screws 324 ( 324 - 21 to 324 - 112 ) may be arranged in a zigzag shape (sawtooth shape) at intervals.

[Modification of side plate 323] In the above-mentioned embodiment, a pair of side plates 323-1 and 323-2 were used for the side plate 323, but instead of the above-mentioned structure, an integral side plate 323 may be used. As shown in FIG. 23 , on the integral side plate 323 , a concave portion 323F for accommodating the gasket 321 and the pressing member 322 (pressing plate 322 - 1 ) is formed at the position of the flow path side exposed portion PE. A threaded hole 323H into which a set screw 324 is screwed is provided in a thin portion 323G of the side plate 323 thinned by forming the recessed portion 323F.

And, by screwing the set screw 324 from the thin portion 323G, the gasket 321 is pressed against the side surface 350S of the first module 350 and the side surface 360S of the second module 360 via the pressing member 322 (pressing plate 322 - 1 ). . Thereby, the spacer 321 can be compressed without using the receiving plate 322-2.

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

In the above-described embodiment, it is constituted as a single-layer type T-die 300 in which two modules (the first module 350 and the second module 360) are overlapped in the T-die body 310. And the two split molds that constitute form a main manifold portion at the overlapping portion, and between the inner surface 350R of the first module 350 and the inner surface 530R of the second module 360, a main manifold portion 316 widened from the main manifold portion is formed. The main clamping surface flow path 317 and the lip portion flow path 318 through which the subsequent molten resin flows. However, instead of the single-layer type T-die, it is also possible to configure a multi-manifold T-die in which, in addition to the inner surface 350R of the first block 350 and the second In addition to the main manifold portion 316 formed between the inner surfaces 530R of the two modules 360 , there are also a first module side manifold portion 3161 and a second module side manifold portion 3162 .

In the multi-manifold type T-die 300A, as shown in FIG. 24 , the T-die main body 310A is the same as the case of the single-layer type shown in FIG. , 360R are overlapped, and are connected and fixed by a plurality of bolts not shown in the figure. In other words, the T-die main body 310A is configured such that the first block 350A and the second block 360A contact the opposing inner surfaces 350R, 360R, and are firmly locked to each other by a plurality of bolts not shown. In addition, the first block 350A and the second block 360A are overlapped and fixed so that the movable lip 312 and the fixed lip 313 face each other, and the block main body 351A and the block main body 361A face each other.

The inner surface 350R of the first block 350A and the inner surface 360R of the second block 360A are overlapped and fixed, and are provided with recesses (recesses, pits, grooves) for forming gaps as the main resin flow path RPM. With this recess, the main introduction flow path 315M, the main manifold portion 316M, the main clamping surface portion flow path 317M, and the lip portion flow path that constitute the main resin flow path RPM of molten resin are formed inside the T-die body 310A. 318.

Specifically, a main introduction flow path 315M communicating with the main inlet 311M of the rear end portion 310RE is formed in the inner central portion of the T-die main body 310A. The main introduction flow path 315M is a flow path for introducing the molten resin fed from the main inlet 311M to the main manifold portion 316M. A main manifold portion 316M communicating with the main introduction channel 315M is formed at the front end of the main introduction channel 315M. The main manifold portion 316M expands the introduced molten resin in the width direction (X direction).

Furthermore, a main clamping surface flow path 317M communicating with the main manifold part 316M is formed at the front end of the main manifold part 316M. The main clamping surface portion flow path 317M is a flow path for reducing the thickness in the Z direction of the molten resin widened by the main manifold portion 316M. The main clamping surface flow path 317M is formed in the range from the outlet of the main manifold portion 316M to the connection portion CN connected to the lip portion flow path 318 .

In addition, a first module-side clamping surface flow path 3171 is connected to the connecting portion CN between the main mold clamping surface flow path 317M and the lip portion flow path 318. The molten resin after the expansion of the module side manifold part 3161 flows and merges the flowing molten resin with the connecting part CN of the main clamping surface flow channel 317M and the lip part flow channel 318, and is connected to the second module side clamping part CN. The surface flow path 3172, the second module side mold closing surface flow path 3172, circulates the molten resin widened by the second module side manifold portion 3162 and connects the flowed molten resin with the main mold closing surface flow path 317M and The connection part CN of the lip flow path 318 merges.

Furthermore, a lip portion flow path 318 communicating with the main clamping surface portion flow path 317M via a connection portion CN is formed at the front end of the main clamping portion portion flow path 317M. The lip 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 portion 352, and the like. The tip of the lip channel 318 communicates with the lip gap 314 .

In addition, in the T-shaped die body 310A, in the first block 350A, there are formed: the first block side introduction flow path 3151 constituting the first block side resin flow path RP1 of molten resin; the first block side manifold portion 3161; And the first block that flows the molten resin widened by the first block side manifold portion 3161 and merges the flowed molten resin with the connecting portion CN between the main clamping surface flow path 317M and the lip portion flow path 318 Side clamping surface flow path 3171.

Specifically, a first module-side inlet flow path 3151 communicating with the first module-side inlet 3111 of the rear end portion 310RE is formed on the first module side of the T-die main body 310A. The first module side introduction flow path 3151 is a flow path for introducing the molten resin fed from the first module side introduction port 3111 to the first module side manifold portion 3161 . A first module side manifold part 3161 communicating with the first module side introduction flow path 3151 is formed at the front end of the first module side introduction flow path 3151 . The first module side manifold portion 3161 expands the introduced molten resin in the width direction (X direction).

Furthermore, a first module side clamping surface flow path 3171 communicating with the first module side manifold part 3161 is formed at the front end of the first module side manifold part 3161 . The first block side clamping surface portion flow path 3171 is a flow path for reducing the thickness in the Z direction of the molten resin widened by the first block side manifold portion 3161 . The first module-side clamping surface flow path 3171 is composed of a flat part 31711 and an inclined part 31712. The flat part 31711 makes the molten resin widened by the first module-side manifold part 3161 flow in the Y direction (in the T-shaped mold body 310A). flow direction of the molten resin), the inclined portion 31712 is used to convey the molten resin from the front end of the flat portion 31711 to the connecting portion CN of the main clamping surface flow path 317M and the lip portion flow path 318, and connect it with this The connecting portion CN is merged and formed obliquely downward in FIG. 24 on the front left side.

In addition, in the T-die body 310A, in the second block 360A, there are formed: a second block-side introduction flow path 3152 constituting a second block-side resin flow path RP2 of molten resin; a second block-side manifold portion 3162; And the second module that flows the molten resin widened by the second module side manifold portion 3162 and merges the flowed molten resin with the connecting portion CN between the main clamping surface flow path 317M and the lip portion flow path 318 The flow path 3172 on the side clamping surface.

Specifically, a second module-side inlet flow path 3152 communicating with the second module-side inlet 3112 of the rear end portion 310RE is formed on the second module side of the T-die main body 310A. The second module-side introduction channel 3152 is a channel for introducing the molten resin fed from the second module-side introduction port 3112 to the second module-side manifold portion 3162 . A second module side manifold portion 3162 communicating with the second module side introduction flow path 3152 is formed at the front end of the second module side introduction flow path 3152 . The second module side manifold portion 3162 expands the introduced molten resin in the width direction (X direction).

Furthermore, a second module side clamping surface flow path 3172 communicating with the second module side manifold part 3162 is formed at the front end of the second module side manifold part 3162 . The second block side clamping surface portion flow path 3172 is a flow path for reducing the thickness in the Z direction of the molten resin widened by the second block side manifold portion 3162 . The second module side clamping surface flow path 3172 is composed of a flat portion 31721 that allows the molten resin widened by the second module side manifold portion 3162 to flow for a predetermined distance in the Y direction, and an inclined portion 31722 . The part 31722 is formed obliquely upward in FIG. Diagonally left forward.

In this way, the first module side clamping surface flow channel 3171 is connected to the connecting portion CN between the main clamping surface flow channel 317M and the lip portion flow channel 318, and the first module side clamping surface flow channel 3171 is connected by the first The molten resin after the expansion of the module side manifold part 3161 flows and merges the flowing molten resin with the connecting part CN of the main clamping surface flow channel 317M and the lip part flow channel 318, and is connected to the second module side clamping part CN. The surface flow path 3172, the second module side mold closing surface flow path 3172, circulates the molten resin widened by the second module side manifold portion 3162 and connects the flowed molten resin with the main mold closing surface flow path 317M and The connection part CN of the lip flow path 318 merges.

FIG. 26 shows a first schematic configuration example of a pressing plate arranged in a side sealing mechanism according to a modified example of the present invention. FIG. 27 shows a second schematic configuration example of a pressing plate arranged in a side sealing mechanism according to a modified example of the present invention. The only difference between the structure of FIG. 26 and the structure of FIG. 27 is that the concave portion as the extrusion preventing portion 330A is formed corresponding to the first module side clamping surface flow path 3171 and the second module side clamping surface flow path 3172. The end shape of the flat part. Specifically, in the configuration of FIG. 26 , the ends of the concave portions are formed in a linear shape, but in the configuration of FIG. 27 , the ends of the concave portions are formed in a stepped shape.

In this modified example, the side sealing mechanism 320A is different in shape and the like, but basically has the same functions as those of the above-mentioned packing and extrusion prevention part. That is, the side sealing mechanism 320A has a gasket (not shown), which is formed in a thin plate shape and has a channel 317M facing the main clamping surface, a channel 318 for the lip part, and a channel 3171 for the first module side clamping surface. And the flow path surface (FC11) of the flow path 3172 on the second module side clamping surface, and the back flow path surface (FC12) on the side opposite to the flow path surface (FC11), the gasket is pressed so that the flow path surface straddles the first The side surface of the module 350A and the side surface of the second module 360A contact each other, and the flow path surface (FC11) connects the side of the main clamping surface flow path 317M, the side of the lip flow path 318, and the first module side clamping surface. The side of the flow path 3171 and the side of the second module side clamping surface flow path 3172 are blocked. In addition, the side sealing mechanism 320A has an extrusion preventing portion 330A, which prevents the gasket from moving toward the inner surface of the first module 350A and the second module by allowing deformation of the gasket toward the back flow path (FC12) side. The extrusion deformation between the inner surfaces of the two blocks 360A, and the first block side clamping surface channel 3171 and the second module side clamping surface channel 3172. In particular, there is an extrusion prevention portion 330A that prevents deformation of the gasket from extrusion between the inner surface of the first block 350A and the inner surface of the second block 360A, especially the lip flow path 318 .

In this way, the extrusion prevention part 330A is provided in the side sealing mechanism 320A. The extrusion prevention part 330A is comprised by the recessed part 331A provided in the pressing surface FC21A of the pressing plate 322-1A.

The concave portion 331A, which is the extrusion preventing portion 330A, is connected to the side exposed portion PE of the flow path, that is, the side of the main clamping surface flow path 317M, the lip portion flow path 318, the first module side clamping surface flow path 3171, and the second The mold-side clamping surface flow path 3172 is formed on the pressing surface FC21A of the pressing plate 322-1A facing the back flow path surface (FC12) of the gasket (321) in accordance with the shape of the mold side. In addition, a space SPC is formed in the depression of the concave portion 331A in a state where the pressing surface 322-1A of the pressing plate 322-1A is brought into contact with the back flow path surface of the gasket.

Similar to the above-mentioned T-shaped die 300, by applying the side sealing mechanism 320A as "the groove portion on the pressing plate" of the present invention, if it is associated with Fig. 11(B) and Fig. 13 , the gasket 321 Extrusion (invasion) of the flow path surface FC11 is eliminated, and as shown in FIG. 11(B) and FIG. 13 , depressions are observed on the flow path surface FC11. Furthermore, by applying the modified example of the present invention, the deformation of the gasket 321 toward the back flow path surface FC12 side was confirmed in relation to FIG. 11(B) and FIG. 14 . As described above, this is considered to be related to the suppression of extrusion (intrusion) of the liner that should have been extruded (intrusion) into the lip flow channel 318 .

As described above, by forming the concave portion 331A as the groove portion in the pressing plate 322-1A, as a result, the liner is deformed toward the back flow path surface FC12 side, and the extrusion (intrusion) of the liner into the lip flow path 318 is suppressed. The adjustment bolt 319 when adjusting the lip gap 314 also rotates smoothly, thereby improving the operability of the T-die 300A. In addition, since there is no intrusion of the gasket, it is also possible to prevent the gasket from falling off easily, and replacement of the gasket does not become complicated, and there is an advantage that replacement of the gasket becomes easy.

FIG. 28 is a perspective view showing another schematic structure of a multi-manifold T-die body according to a modified example of the present invention.

In the T-shaped dies 300 and 300A described above, the adjustment of the lip gap 314 is performed as follows: the movable die lip 312 is pushed and pulled by a plurality of adjustment bolts 319 provided in the width direction of the T-shaped die body 310 so that the movable die lip 312 is adjusted. The lip 312 is moved to adjust the position of the movable lip 312 relative to the fixed lip 313 in the width direction, thereby uniformly discharging molten resin. In the modified example of FIG. 28 , in addition to adjusting the position of the movable lip 312 relative to the fixed lip 313 in the width direction, it is also possible to use a plurality of dies provided in the width direction of the T-shaped die body 310B. The adjustment bolt 3191 and the throttle rod 381 for flow rate adjustment respectively adjust the thickness of the flat part 31711 of the first module side clamping surface flow path 3171 in the width direction, and utilize the multi-layer structure provided in the width direction of the T-shaped mold body 310B. Each adjustment bolt 3192 and the throttle rod 382 for flow velocity adjustment adjust the thickness of the flat portion 31721 of the second module side clamping surface flow path 3172 in the width direction. The throttle lever includes a vertical throttle lever and an inclined throttle lever, and the vertical throttle lever is shown in FIG. 28 as an example.

Accordingly, the molten resin is further adjusted to flow without thickness unevenness, and the molten resin can be discharged more uniformly.

In the modified example of FIG. 28, as described above, corresponding to the flat portion 31711 of the first module side clamping surface flow path 3171 and the flat portion 31721 of the second module side clamping surface flow path 3172, there are anti-jamming pads. The extrusion preventing portion 330A is deformed by the flat portion 31711, 31721 being extruded. More specifically, by forming the recessed portion 331A as a groove portion in the pressing plate 322-1A, as a result, the packing is deformed toward the back flow path surface FC12 side, and extrusion (intrusion) of the packing into the flat portions 31711, 31721 is suppressed. Even if the adjustment bolt 3192 is smoothly rotated when adjusting the thickness of the flat parts 31711 and 31721, the operability of the T-die 300B can be improved. In addition, since there is no intrusion of the gasket, it is also possible to prevent the gasket from falling off easily, and replacement of the gasket does not become complicated, and there is an advantage that replacement of the gasket becomes easy.

[other modified examples] In the above-mentioned embodiment, the T-shaped mold body 310 is formed as two split molds formed by overlapping two modules (the first module 350 and the second module 360), but the T-shaped mold body 310 can also be used instead of the above-mentioned structure. Formed as three split molds consisting of three parts. In the case of three split molds, the T-shaped mold body 310 is configured to have a mold base on which an inlet, an introduction flow path, and a manifold are formed, and a mold base that is respectively attached to the mold base to form a mold clamping surface flow path 317 and a die lip. Two modules of the external flow path 318. It is also possible to apply the first module 350 and the second module 360 to these two modules. In addition, in the above-mentioned embodiment, the T-die 300 is a single-layer die for producing a single-layer sheet, but instead of the above structure, the T-die 300 may be formed as a multi-layer die (multi-manifold die) for producing a multi-layer sheet.

It should be understood that the embodiments and examples disclosed this time are illustrative and not restrictive in any respect. The scope of the present invention is defined not by the above description but by the claims, and it is intended that all changes within the meanings equivalent to the claims and within the ranges are included.

100: Sheet and film manufacturing equipment 300, 300A, 300B: T-shaped mold 310, 310A, 310B: T-shaped mold body 310S: The side of the T-shaped die body 310 312: Movable die lip 313: fixed die lip 314: Die lip gap 316: Manifold 317: Clamping facial flow path 318: Die lip flow path 316M: Main manifold 317M: main clamping face flow path 3171: The flow path of the first module side clamping face 31711: flat part 31712: Inclined part 3172: The flow path of the second module side clamping face 31721: flat part 31722: Inclined part 320, 320A: side airtight mechanism 321: Liner 322: Press parts 322-1, 322-1A: Press plate 322-2: bearing plate 322-2H: threaded hole 323 (323-1, 323-2): side panels 323-1S: the side of the side plate 323-1 323-1T, 323-2T: convex part 323-2S: the side of the side plate 323-2 324: Stop screw 330, 330A: prevent extrusion part 331, 331A: concave part 332: Groove 350, 350A: the first module 350R: inner surface of the first module 350 350S: the side of the first module 350 facing the X direction 360, 360A: the second module 360R: inner surface of the second module 360 360S: the side of the second module 360 facing the X direction 370: Bolt CTR: Center FC11: Flow surface FC12: back flow road FC21: Pushing surface FC22: push the opposite side LDC: load center PE: side exposed part of flow path SPC: space WPE: base width

FIG. 1 is a side sectional view showing a schematic structure of a conventional T-die. Fig. 2 is a diagram showing a mounting structure of a liner of a conventional T-die. Fig. 3 is a schematic configuration diagram showing a sheet and film manufacturing apparatus according to an embodiment of the present invention. Fig. 4 is a partially cutaway perspective view showing a schematic structure of a T-die according to an embodiment of the present invention. Fig. 5 is a side sectional view showing a schematic structure of a T-die main body. Fig. 6 is an exploded perspective view showing a partially cutaway side sealing mechanism. Fig. 7 is a diagram showing the mounting structure of a gasket and a pressing plate in the side sealing mechanism. 8(A) and (B) are schematic configuration diagrams showing a gasket arranged in a side sealing mechanism. 9(A) and (B) are schematic configuration diagrams showing a pressing plate disposed on the side sealing mechanism. Fig. 10 is a diagram showing the arrangement of set screws in the side sealing mechanism. Figure 11(A) and (B) schematically show the side sealing mechanism of "no groove on the pressing plate" as a comparative example, and the side of "having a groove on the pressing plate" as the present invention A diagram showing the extrusion (intrusion) state of the gasket when the square sealing mechanism was installed in a T-die and a sheet production test was performed. 12 is a graph showing measurement of displacement of the flow path surface of the gasket in the comparative example. Fig. 13 is a graph showing measurement of displacement of the flow path surface of the gasket in the present invention. Fig. 14 is a graph showing the measurement of the displacement of the back flow path surface of the gasket in the present invention. Fig. 15 is a diagram showing a mounting structure of a gasket and a pressing plate according to a modified example of the present invention. 16(A) and (B) are schematic configuration diagrams showing a gasket according to a modified example of the present invention. 17(A) and (B) are schematic configuration diagrams showing a pressing plate according to a modified example of the present invention. Fig. 18 is a diagram showing a mounting structure of a gasket and a pressing plate according to a modified example of the present invention. Fig. 19 is a diagram showing a mounting structure of a gasket and a pressing plate according to a modified example of the present invention. Fig. 20 is an arrangement diagram showing a set screw according to a modified example of the present invention. Fig. 21 is an arrangement diagram showing a set screw according to a modified example of the present invention. Fig. 22 is an arrangement diagram showing a set screw according to a modified example of the present invention. Fig. 23 is a schematic configuration diagram showing a side plate according to a modified example of the present invention. Fig. 24 is a schematic configuration diagram showing a multi-manifold T-die body according to a modified example of the present invention. Fig. 25 is a partially cutaway perspective view exploded and showing a schematic structure of a multi-manifold T-die body and a side sealing mechanism according to a modified example of the present invention. 26(A) and (B) are diagrams showing a configuration example of a grooved pressing plate of a side sealing mechanism for a multi-manifold type T-die body according to a modified example of the present invention. 27(A) and (B) are diagrams showing other structural examples of the grooved pressing plate of the side sealing mechanism for the multi-manifold type T-die body according to the modified example of the present invention. 28 is a perspective view showing another schematic structure of a multi-manifold T-die body according to a modified example of the present invention.

310: T-shaped mold body

310S: The side of the T-shaped die body 310

317: Clamping facial flow path

318: Die lip flow path

320: side airtight mechanism

321: Liner

322: Press parts

322-1: Press plate

322-2: bearing plate

322-2H: threaded hole

323 (323-1, 323-2): side panels

323-1S: the side of the side plate 323-1

323-1T, 323-2T: convex part

323-2S: the side of the side plate 323-2

324: Stop screw

330: Extrusion prevention part

331: concave part

332: Groove

350: The first module

350R: inner surface of the first module 350

350S: the side of the first module 350 facing the X direction

360: Second module

360R: inner surface of the second module 360

360S: the side of the second module 360 facing the X direction

370: Bolt

CTR: Center

FC11: Flow surface

FC12: back flow road

FC21: Pushing surface

FC22: push the opposite side

LDC: load center

PE: side exposed part of flow path

SPC: space

WPE: base width

Claims (15)

A T-shaped die is a T-shaped die that uses a manifold to widen the introduced molten resin toward the width direction, and discharges it in a thin sheet or film form from a gap between die lips, and is characterized in that it has: a T-shaped die body, which There are a first block and a second block facing each other, and between the inner surfaces of the first block and the second block facing each other, there are formed a mold clamping surface flow path and a lip flow path through which molten resin flows. Road, and a side sealing mechanism, which is installed on: the side of the aforementioned T-shaped mold body composed of the side of the aforementioned first module and the side of the aforementioned second module, and is used to seal the side of the aforementioned mold clamping surface flow path and the side of the flow path of the aforementioned die lip to be sealed; the aforementioned side sealing mechanism includes: a liner and an extrusion prevention part; The flow path surface of the lip flow path and the back flow path surface opposite to the flow path surface are pressed against the ground by making the flow path surface straddle the side surfaces of the first module and the second module. Close to the side of the first module and the side of the second module, so that the flow path surface blocks the side of the flow path of the mold clamping surface and the side of the flow path of the die lip; the extrusion prevention part is Preventing deformation of the gasket toward the space between the inner surface of the first module and the inner surface of the second module by allowing the gasket to deform toward the side of the backflow path; The aforementioned side airtight mechanism includes a pressing member, the pressing member has a pressing surface that abuts against and presses against the aforementioned backflow road surface; the aforementioned pressing member has a pressing plate, and the aforementioned pressing plate is flat and has a planar pressing surface. surface, and a back surface facing the opposite side of the aforementioned pressing surface and parallel to the aforementioned pressing surface; the aforementioned anti-extrusion portion has: a concave portion formed on at least one of the aforementioned pressing surface and the aforementioned back flow path surface; the aforementioned concave portion is formed to accommodate The space of the deformed part of the aforementioned liner. In the T-shaped die described in claim 1 of the patent claims, the aforementioned concave portion is a groove portion formed on the aforementioned pressing surface. The T-shaped mold as described in item 1 or 2 of the scope of the patent application, wherein the side sealing mechanism includes: a pair of side plates installed on the side of the first module and the side of the second module respectively; The component has: a receiving plate that is locked to the aforementioned pair of side plates; by screwing a set screw from the aforementioned receiving plate, the aforementioned gasket is pressed across and pressed against the aforementioned first module through the aforementioned pressing plate. side and the side of the aforementioned second module. The T-shaped die as described in item 1 or 2 of the scope of the patent application, wherein, The aforementioned side airtight mechanism comprises a side plate, which is installed across the side of the aforementioned first module and the side of the aforementioned second module; the aforementioned side plate is tied to the side of the aforementioned first module and the side of the aforementioned second module The abutting surface has a concave portion for accommodating the aforementioned gasket and the aforementioned pressing member; by screwing a set screw from the aforementioned side plate, the aforementioned gasket is straddled and pressed against the aforementioned first via the aforementioned pressing member. The side of the module and the side of the aforementioned second module. A sheet and film manufacturing device is characterized in that it is equipped with a T-shaped die described in any one of items 1 to 4 of the scope of the patent application. A T-shaped die that uses multiple manifolds to widen the introduced molten resin in the width direction, merges the widened molten resin in the main flow path, and discharges it in a sheet or film form from the gap between the die lips. The T-shaped mold is characterized by having: a T-shaped mold body, which has a first module and a second module facing each other, at least between the inner surfaces of the aforementioned first module and the inner surface of the aforementioned second module facing each other , formed with: the flow path of the main clamping surface and the flow path of the lip portion through which the molten resin expanded by the main manifold portion flows, and the side sealing mechanism, which is attached to: the first module including the above-mentioned The side surface of the T-shaped mold body formed by the side surface and the side surface of the second module at least divides the side of the flow path of the main clamping surface and the flow path of the lip part. The sides of the above-mentioned T-shaped mold are sealed; the aforementioned T-shaped mold body is tied in the aforementioned first module, forming: the first module side manifold part and the first module side mold closing surface flow path; the aforementioned first module side mold closing surface flow path a channel for circulating the molten resin widened by the first module side manifold, and converging the circulated molten resin at the junction of the main clamping surface channel and the lip channel; and In the second module, there are formed: the second module side manifold part and the second module side clamping surface flow path; the second module side mold closing surface flow path is formed by the second module side manifold The molten resin after the widening part is circulated, and the circulating molten resin is merged at the connecting part of the aforementioned main mold clamping surface flow path and the aforementioned die lip flow path; the aforementioned side sealing mechanism includes: a gasket, and a Extrusion section; the liner is formed in a thin plate shape and has a flow path facing the main clamping surface, a flow path of the lip part, a flow path of the first module side clamping surface, and a second mold side clamping surface The flow path surface of the flow path and the back flow path surface on the opposite side to the flow path surface are made to straddle the side surfaces of the first module and the side surfaces of the second module and press against the first module in abutting manner. The side surface of the first module and the side surface of the second module are such that the flow path faces the side of the flow path of the main clamping surface, the side of the flow path of the lip part, and the side of the flow path of the clamping surface of the first module. side, and the side of the flow path of the clamping surface on the side of the second module; the extrusion prevention part prevents the gasket from moving toward the first module by allowing the gasket to deform toward the side of the back flow path. the inner surface of the Between the inner surfaces of the second block, and at least the inner surface of the first block and the inner surface of the second block in the first block side clamping surface flow path and the second block side clamping face flow path The deformation of extruding between them; the aforementioned side sealing mechanism includes a pressing member, and the pressing member has a pressing surface that abuts against and is pressed against the aforementioned backflow road surface; the aforementioned pressing member has a pressing plate, and the aforementioned pressing plate is in the shape of a flat plate, and has a planar pressing surface and a back surface facing the opposite side of the pressing surface and parallel to the pressing surface; the extrusion preventing portion has: a concave portion formed on at least one of the pressing surface and the back flow path surface . The T-shaped mold according to claim 6 of the patent application, wherein at least one of the first module-side clamping surface flow path and the second module-side clamping surface flow path includes a flat portion, and the flat portion is The molten resin widened in the corresponding manifold part flows for a predetermined distance toward the flow direction of the T-shaped die; the aforementioned flat part is equipped with a throttle rod for adjusting the flow rate; the aforementioned side sealing mechanism includes an anti-extrusion The extrusion preventing portion prevents deformation of the gasket from being extruded toward at least the flat portion of the first module-side clamping surface flow path and the second module-side clamping surface flow path. The T-shaped die as described in item 6 or 7 of the scope of the patent application, wherein, The extrusion prevention part has a concave part provided on the pressing surface and formed by a space for accommodating the deformed part of the gasket. The T-shaped mold according to claim 8 of the patent application, wherein the concave portion is a groove portion formed on the pressing surface. The T-shaped die according to claim 6 of the patent claims, wherein the extrusion preventing portion has a concave portion provided on the backflow path surface and formed by a space for accommodating the deformed portion of the gasket. The T-shaped mold as described in item 7 or 10 of the scope of the patent application, wherein the side sealing mechanism includes a pair of side plates, and the pair of side plates are respectively installed on the side of the first module and the side of the second module The above-mentioned pressing member has: a receiving plate that is locked on the aforementioned pair of side plates; by screwing a stop screw from the aforementioned receiving plate, the aforementioned gasket is pressed across the aforementioned first second plate through the aforementioned pressing plate. A side of a module and a side of the aforementioned second module. The T-shaped mold as described in item 10 of the scope of the patent application, wherein the side sealing mechanism includes a side plate, and the side plate is installed across the side of the first module and the side of the second module; the side plate , tied to the abutting surface abutting against the side of the first module and the side of the second module, having the accommodating pad and the pressing portion The concave part of the component; by screwing the set screw from the side plate, the gasket is pressed across the side of the first module and the side of the second module through the pressing member. A sheet and film manufacturing device is characterized in that it is equipped with a T-shaped die as described in any one of items 6 to 12 of the scope of the patent application. A liner for a T-shaped mold is a liner for a T-shaped mold installed on the side of a T-shaped mold body; the T-shaped mold body has a first module and a second module facing each other. Between the inner surface of the block and the inner surface of the second block, there are formed a clamping surface flow path and a lip portion flow path through which the molten resin flows, and the introduced molten resin is widened in the width direction by the manifold portion and It is expelled from the die lip gap in the form of flakes or films; the side of the aforementioned T-shaped mold body is composed of the side of the aforementioned first module and the side of the aforementioned second module; it is characterized in that: the gasket for the aforementioned T-shaped mold, The system is formed in a thin plate shape, and has a flow path surface facing the flow path of the clamping surface and the flow path of the lip part, and a back flow path surface opposite to the flow path surface. By making the flow path surface straddle the first The side of the module and the side of the second module are pressed against the side of the first module and the side of the second module, so that the flow path surface connects the side of the flow path of the mold clamping surface and the lip portion The side of the flow path is blocked, and a recess is formed on the back flow path; The aforementioned recess forms a space for accommodating the deformed part of the aforementioned liner. A side airtight mechanism is a side airtight mechanism installed on the side of a T-shaped mold body; the T-shaped mold body has a first module and a second module facing each other, and the inner surfaces of the aforementioned first modules facing each other Between the inner surface of the second block, there are formed a mold clamping surface flow path and a lip portion flow path through which the molten resin flows, and the molten resin introduced is widened in the width direction by the manifold portion and passed through the lip gap. It is extruded in the shape of a sheet or a film; the side of the aforementioned T-shaped mold body is composed of the side of the aforementioned first module and the side of the aforementioned second module; it is characterized in that the aforementioned side sealing mechanism includes: a liner, And the extrusion prevention part; the gasket is formed in a thin plate shape, has a flow path surface facing the flow path of the clamping surface and the flow path of the die lip, and a back flow path surface opposite to the flow path surface, by Make the aforementioned flow path surface straddle the side of the aforementioned first module and the side of the aforementioned second module, and press against the side of the aforementioned first module and the side of the aforementioned second module, so that the aforementioned flow path surface will press the aforementioned mold clamping surface The sides of the flow path and the flow path of the aforementioned die lip are blocked, and a concave portion is formed on the aforementioned back flow path; the aforementioned concave portion forms a space for accommodating the deformed part of the aforementioned liner; the extrusion preventing portion is By allowing the deformation of the gasket toward the side of the back flow path, the deformation of the gasket between the inner surface of the first module and the inner surface of the second module is prevented.

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