JP6019251B2 - Flat die for extrusion molding and film forming method - Google Patents

Description

  The present invention relates to a flat die for extrusion molding and a film molding method for discharging a molten material.

  In a molding process of extruding a film, an extruder that extrudes a molten material such as a resin material melted by a melt plasticizer is used. The extruder has a pipe through which the extruded molten material flows, and has a flat die for extrusion molding (hereinafter referred to as a flat die) having a slit-like discharge port for discharging the molten material into a thin and wide film. Is connected to the end of the pipe.

  FIG. 8 shows a schematic perspective view of a conventional flat die. FIG. 9 is a cross-sectional view taken along the line BB in FIG. 8 of the main part of the conventional flat die.

  As shown in FIG. 8, a conventional flat die 101 includes a die body 105 in which a flow path 106 of a molten material is formed. The die main body 105 is configured by combining a pair of main bodies 105 a and 105 b and using a plurality of fastening bolts 110. In the die body 105, a slit-like discharge port 107 for discharging the molten material is formed on the downstream side of the flow path 106. The die body 105 has two side surfaces 108 that intersect with the longitudinal direction of the slit-like discharge port 107 (hereinafter referred to as the width direction D1 of the discharge port 107). Each side surface 108 is provided with a groove 109 communicating with both ends of the discharge port 107 in the width direction D1.

  As shown in FIG. 9, a side plate 111 is fixed to the side surface 108 of the die body 105 so as to seal the groove 109 in order to prevent the molten material from leaking out of the groove 109. The side plate 111 is provided on the pair of main bodies 105 a and 105 b so as to block the groove 109 so as to straddle the gap direction perpendicular to the longitudinal direction of the groove 109 (hereinafter referred to as the gap direction S of the groove 109). Yes. The side plate 111 is fixed to the side surface 108 of the die body 105 using a plurality of fixing screws 115. That is, the side plate 111 is disposed at both ends in the width direction D1 of the discharge port 107 so as to straddle the gap direction S of the groove 109, which is a direction orthogonal to the width direction D1 of the discharge port 107.

  In general, a flat die is required to uniformly discharge the thickness of the molten material discharged from the discharge port over the width direction of the film to be molded, that is, the width direction D1 of the slit-shaped discharge port.

  The uniformity of the thickness of the molten material in the width direction D1 of the discharge port is determined not only by the shape of the discharge port, but also by the viscosity of the molten material and the shape of the flow path for sending the molten material to the discharge port. Therefore, a so-called coat hanger type die shown in FIG. 10A is known as the shape of the flow path that improves the uniformity of the molten material discharged from the discharge port. The edge 120 of the coat hanger die flow channel connected to the melted material flow channel 106 is formed as a curved surface that gradually spreads and curves in a hanger shape, and is formed to be smoothly continuous with the discharge port 107. ing.

  Thus, even if the shape of the flow path is set in accordance with the viscosity of the molten material so that the molten material is discharged with a uniform thickness over the width direction D1 of the discharge port, the actual extrusion of the molten material is performed. In the process, the thickness of the molten material discharged from the discharge port may not be uniform over the width direction D1 of the discharge port. One of the reasons why the thickness of the molten material does not become uniform in this way is that the gap between the discharge ports is opened by the internal pressure of the flat die generated when the molten material flows in the flow path of the flat die, and the width of the discharge port In other words, the gap between the discharge ports is unevenly opened in the direction, that is, so-called opening occurs. This mouth opening is caused by the difference between the positions of the plurality of fastening bolts connecting the pair of main bodies and the discharge ports at the center portion and the outer edge portion of the flat die. This is caused by the difference in moment of inertia caused by the tightening force.

  As a shape of a flow path for preventing such a difference in moment of inertia, a flow path of a straight manifold die shown in FIG. 10B is known. In the straight manifold die, the distance between each fastening bolt 110 of the die body and the slit-like discharge port 107 is made equal at each position in the width direction of the discharge port 107, thereby opening the mouth over the width direction of the discharge port. The amount uniformity is enhanced.

  Further, a flat die having an adjustment mechanism for correcting an uneven opening amount in the width direction of the discharge port by applying a pressing force to the lip portion constituting the discharge port with respect to the opening amount has been proposed. (For example, refer to Patent Documents 1 and 2). In this flat die, a plurality of adjusting mechanisms are arranged along the width direction D1 of the discharge port, and the opening amount is adjusted by adjusting the adjusting mechanism arranged at a position where the opening amount is relatively large. Correct small. Thereby, the opening amount in the width direction D1 of the discharge port is made uniform, and the molten material discharged from the discharge port can be discharged in a uniform thickness over the width direction D1 of the discharge port.

JP 2011-218651 A JP 2013-52574 A

  By the way, as shown in FIGS. 8 and 9, a pair of side plates 111 is formed on each side surface 108 of the flat die 101 in order to seal the grooves 109 communicating with both end portions in the width direction D1 of the discharge port 107. Is fixed. Such a side plate 111 constrains both ends in the width direction D1 of the discharge port 107, and the die body 105 with respect to a direction (hereinafter referred to as a mouth opening direction) for opening and closing a gap at both ends of the discharge port 107. Therefore, the amount of opening at both ends of the discharge port 105 tends to be small.

  Therefore, also in the above-described straight manifold die, the displacement of the die body with respect to the opening direction at both ends in the width direction D1 of the discharge port is restricted by the side plate, so that the opening amount in the width direction D1 of the discharge port The cause of non-uniform amounts has not been resolved.

  Similarly, in the flat die having the above-described adjustment mechanism, the adjustment mechanisms arranged at both ends in the width direction of the discharge port are affected by the side plate that regulates the displacement of the die body with respect to the opening direction of the discharge port. receive. For this reason, when the adjustment mechanism arrange | positioned at the both ends in the width direction of a discharge outlet is used, since the effect of adjustment is suppressed, adjustment of opening amount will become inadequate.

  Then, this invention provides the flat die for extrusion molding which can equalize the opening amount in the longitudinal direction of a discharge outlet, and can improve the uniformity of the thickness of the film in the width direction of a film, and a film forming method. Objective.

  In order to achieve the above-mentioned object, the flat die for extrusion molding according to the present invention is provided on each of the side surfaces and a slit-like discharge port that discharges the molten material, two side surfaces that intersect the longitudinal direction of the discharge port, respectively. And a die body having a groove communicating with both ends in the longitudinal direction of the discharge port. In addition, the present invention includes a sealing mechanism that is provided on each side surface of the die body and seals the groove so that the gap of the groove is variable in the gap direction orthogonal to the longitudinal direction of the groove. The sealing mechanism includes a sealing member that is disposed along the groove to close the groove, a pressing unit that presses the sealing member against the side surface, and a pair of first and second members that support the pressing unit and are fixed to the side surface. And a support member. The first support member is fixed to one end side of the side surface in the gap direction, and the second support member is fixed to the other end side of the side surface in the gap direction.

  According to the flat die for extrusion molding according to the present invention configured as described above, the groove on the side surface of the die body is sealed by the sealing mechanism so that the gap can be varied in the gap direction. For this reason, when a force greater than the pressing force with which the pressing means presses the sealing member against the side surface of the die body acts on the gap direction of the groove, the sealing member keeps the groove sealed. Until then, the edge in the gap direction of the groove slides in the gap direction with respect to the sealing member. At this time, the first and second support members slide relative to the pressing means that presses the sealing member against the side surfaces, and are displaced independently with respect to the gap direction of the groove. Thus, in the state which the sealing member sealed the groove | channel, the both ends in the longitudinal direction (width direction) of the discharge outlet are not restrained by the 1st and 2nd support member fixed to the side surface. Therefore, since the displacement of the die main body with respect to the direction in which the groove gap opens is not restricted, the displacement of the both ends in the longitudinal direction of the discharge port in the direction in which the opening amount of the discharge port is changed is not restricted. Thereby, since the change of the opening amount at both ends in the longitudinal direction of the discharge port is not hindered, the opening amount is made uniform over the longitudinal direction of the discharge port.

  Moreover, the film forming method according to the present invention includes a step of discharging a molten material using the above extrusion molding flat die and a step of forming a film by the molten material discharged from the extrusion forming flat die.

  ADVANTAGE OF THE INVENTION According to this invention, the amount of opening can be equalized over the longitudinal direction of a discharge outlet, and the uniformity of the thickness of the film in the width direction of a film can be improved.

It is a perspective view which shows typically the flat die | dye of this embodiment. It is a front view which shows the flat die of this embodiment partially in a cross section. It is sectional drawing which shows the sealing mechanism with which the flat die of this embodiment is provided along the AA line in FIG. It is a side view which shows the sealing mechanism with which the flat die of this embodiment is provided. In the flat die of this embodiment, it is a figure which shows the relative opening amount with respect to the position in the width direction of a discharge outlet. In other embodiment, it is a schematic diagram which shows the structural example of the positioning recessed part for positioning a sealing member. In other embodiment, it is a schematic diagram which shows the structural example of the positioning convex part for positioning a sealing member. In other embodiment, it is a schematic diagram which shows the structural example for preventing the fall of a sealing member. It is a perspective view which shows the conventional flat die typically. It is sectional drawing which shows the principal part of the conventional flat die along the BB line in FIG. It is sectional drawing which shows typically the flow path of the conventional coat hanger type die. It is sectional drawing which shows typically the flow path of the conventional straight manifold type | mold die.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, the typical perspective view of the flat die of this embodiment is shown. In FIG. 2, the front view of the flat die | dye of this embodiment is shown. The flat die 1 of the present embodiment is attached to an extruder that extrudes a molten resin material as a molten material, and is used for discharging the resin material into a film shape.

  As shown in FIGS. 1 and 2, the flat die 1 of this embodiment includes a slit-like discharge port 7 that discharges a molten material in a film shape, and two side surfaces 8 that are orthogonal to the width direction D1 of the discharge port 7. The die body 5 is provided on each side surface 8 and having grooves 9 communicating with both ends of the discharge port 7 in the width direction D1.

  Further, the flat die 1 of the present embodiment is provided on each side surface 8 of the die body 5, and the groove 9 has a groove 9 in which the gap of the groove 9 can be varied in the gap direction S perpendicular to the width direction D1 of the discharge port 7. A sealing mechanism 11 for sealing 9 is provided. The die main body 5 is configured by combining a pair of main bodies 5 a and 5 b and integrally connecting them using a plurality of fastening bolts 10. A flow path 6 through which the molten resin material flows is formed inside the die body 5, and a discharge port 7 is formed downstream of the flow path 6.

  In FIG. 3, the top view of the sealing mechanism 11 with which the flat die 1 of this embodiment is provided is shown. In FIG. 4, the side view of the sealing mechanism 11 with which the flat die 1 of this embodiment is provided is shown.

  As shown in FIGS. 3 and 4, the seal mechanism 11 includes a sealing member 12 that is disposed along the groove 9 to close the groove 9, and a pressing member 14 that serves as a pressing unit that presses the sealing member 12 against the side surface 8. And a pair of first and second support members 13 a and 13 b that support the pressing member 14 and are fixed to the side surface 8. The first support member 13 a is fixed to one end side of the side surface 8 with respect to the gap direction S of the groove 9, and the second support member 13 b is the other end of the side surface 8 with respect to the gap direction S of the groove 9. It is fixed on the side. As shown in FIG. 4, the sealing member 12 is formed in a long shape extending in the longitudinal direction D <b> 2 of the groove 9.

  As shown in FIG. 3, the pressing member 14 includes a guide member 14 a that contacts the sealing member 12 to guide the position of the sealing member 12 with respect to the groove 9, and a guide member that has one end abutting the sealing member 12. 14a, and a plurality of pressing screws 14b that press the sealing member 12 against the side surface 8 of the die body 5.

  The first support member 13 a is in contact with one end side in the gap direction S of the groove 9 and the second support member 13 b is in contact with the other end side in the gap direction S of the groove 9. . Further, as shown in FIG. 3, the guide member 14 a has a cross-section [formed in a letter shape, and has a guide concave portion 17 as a guide portion for guiding the position of the sealing member 12 with respect to the groove 9. The guide member 14a is disposed along the longitudinal direction D2 of the sealing member 12 so as to cover the sealing member 12. By using the guide member 14a, the sealing member 12 can be easily positioned at a predetermined position with respect to the groove 9.

  As shown in FIG. 4, the pressing screw 14 b is disposed on the guide member 14 a at a predetermined interval along the longitudinal direction D <b> 2 of the groove 9. The guide member 14a is provided with a screw hole into which the pressing screw 14b is screwed. The head of the pressing screw 14b protrudes to the outside through a gap where the first support member 13a and the second support member 13b face each other, and the first and second support members 13a and 13b are fixed to the side surface 8. In this state, the screwing amount of the pressing screw 14b can be adjusted.

  Each of the first and second support members 13a and 13b is provided with a concave portion 18 as a guide portion for guiding the guide member 14a on a surface that is in contact with the side surface 8 of the die body 5. The guide member 14a engages with the recess 18 of each of the first and second support members 13a and 13b, so that movement when the pressing screw 14b is screwed in is restricted. Further, as shown in FIG. 3, the first support member 13 a is provided on one end side in the gap direction S of the groove 9 in the guide member 14 a in a state where the seal mechanism 11 is fixed to the side surface 8 of the die body 5. The contact is made so as to restrict the movement of the guide member 14a relative to the axial direction of the pressing screw 14b (relative to the direction away from the sealing member 12). Similarly, the second support member 13b is in contact with the guide member 14a on the other end side in the gap direction S of the groove 9 so as to restrict the movement of the guide member 14a with respect to the axial direction of the pressing screw 14b. Yes.

  As described above, since the pressing screw 14b is engaged with the screw hole of the guide member 14a, one end of the pressing screw 14b comes into contact with the sealing member 12 by being screwed in by a predetermined screwing amount. By further screwing the pressing screw 14b, one end of the pressing screw 14b presses the sealing member 12 against the side surface 8, and the reaction force from the sealing member 12 is received by the guide member 14a. At this time, the movement of the pressing screw 14b in the axial direction of the guide member 14a is restricted by the concave portions 18 of the first and second support members 13a and 13b, so that the pressing screw 14b fixed to the guide member 14a The sealing member 12 is pressed against the side surface 8 by one end. Further, by adjusting the screwing amount of the pressing screw 14b as necessary, the pressing state of the sealing member 12 against the side surface 8 can be finely adjusted, and the sealing for sealing the groove 9 using the sealing member 12 is possible. The reliability of the stopped state can be increased.

  Further, as shown in FIGS. 3 and 4, the seal mechanism 11 includes a plurality of fixing screws 15 that fix the first and second support members 13 a and 13 b to the side surface 8. The fixing screw 15 is disposed on the first and second support members 13a and 13b at a predetermined interval along the longitudinal direction D2 of the groove 9, and the first and second support members 13a and 13b are attached to the first and second support members 13a and 13b. It penetrates and is fixed to the side surface 8.

  The sealing mechanism 11 in the present embodiment is configured such that the sealing member 12 is pressed against the side surface 8 by the first and second support members 13a and 13b via the guide member 14a and the pressing screw 14b. However, it is not limited to the structure which has the guide member 14a and the press screw 14b. As a modification, the sealing member 12 may be configured to be pressed directly against the side surface 8 of the die body 5 by the first and second support members 13a and 13b. In this case, instead of providing the guide member 14a and the pressing screw 14b, an urging member such as a leaf spring for pressing the sealing member 12 is provided in each concave portion 18 of the first and second support members 13a and 13b. May be.

  Regarding the flat die 1 configured as described above, a state in which the groove 9 on the side surface 8 of the die body 5 is sealed by the seal mechanism 11 will be described.

  The groove 9 on the side surface 8 of the die body 5 is sealed by the seal mechanism 11 so as to be displaceable in the gap direction S. For this reason, when a force larger than the pressing force with which the guide member 14 a and the pressing screw 14 b press the sealing member 12 against the side surface 8 of the die body 5 acts on the gap direction S of the groove 9, the sealing member 12. However, the edge in the gap direction S of the groove 9 slides in the gap direction S with respect to the sealing member 12 while maintaining the state in which the groove 9 is sealed. At this time, the first and second support members 13 a and 13 b slide relative to the guide member 14 a that presses the sealing member 12 against the side surface 8, and are independently displaced with respect to the gap direction S of the groove 9. To do. Thus, in a state where the sealing member 12 seals the groove 9, both end portions in the width direction D <b> 1 of the discharge port 7 are restrained by the first and second support members 13 a and 13 b fixed to the side surface 8. Not. Accordingly, since the displacement of the die body 5 with respect to the direction in which the gap of the groove 9 is opened is not restricted, both end portions in the width direction D1 of the discharge port 7 are displaced in the direction in which the opening amount D of the discharge port 7 shown in FIG. Is not regulated. Thereby, since the change of the opening amount D at both ends in the width direction D1 of the discharge port 7 is not hindered, the opening amount D can be made uniform over the width direction D1 of the discharge port 7.

  When the opening amount D at both ends in the width direction D1 of the discharge port 7 changes in a state where the sealing member 12 seals the groove 9, the state in which the sealing member 12 seals the groove 9 is maintained. Thus, the side surface 8 near the groove 9 slides with respect to the sealing member 12.

  Further, with the sealing member 12 sealing the groove 9, the sealing member 12 is pressed against the side surface 8 by the pressing screw 14 b screwed into the screw hole of the guide member 14 a. The reaction force acting on the guide member 14a is received by the first and second support members 13a and 13b from the sealing member 12 pressed against the side surface 8 by the pressing screw 14b.

  Moreover, the film forming method using the flat die 1 of the present embodiment includes a discharge step of discharging the molten material using the flat die 1 and a forming step of forming a film with the molten material discharged from the flat die 1 in the discharge step. And have. In the molding step, a resin material discharged from the discharge port 7 of the flat die 1 is sandwiched between a pair of molding rolls and molded into a film shape.

  Next, a change in the opening amount D in the width direction D1 of the discharge port 7 when the resin material is discharged using the flat die 1 of the present embodiment will be described.

  FIG. 5 shows the opening amount relative to the position in the width direction D1 of the discharge port 7 in the flat die 1 of the present embodiment. In FIG. 5, the vertical axis indicates the relative opening amount with reference to the center opening amount D in the width direction D1 of the discharge port 7, and the horizontal axis indicates the position of the discharge port 7 in the width direction D1 [ m]. Moreover, in FIG. 5, the flat die 1 of this embodiment is shown by the continuous line L1, and the flat die of a comparative form is shown by the broken line L2. The flat die of the comparative form has a configuration in which the side plate 111 is fixed across the groove 109 of the die main body 105, similarly to the configuration shown in FIGS.

  The relative opening amount indicates a relative value of the opening amount when the central opening amount D in the width direction D1 of the discharge port 107 of the flat die of the comparative form is “1”.

  As shown in FIG. 5, the flat die of the comparative form has a smaller amount of relative opening as it approaches the end from the center in the width direction D <b> 1 of the discharge port 107. In the width direction D1 of the discharge port 107, the relative opening amount sharply decreases as the distance from the end of the discharge port 107 approaches 1.5m, and the relative opening amount at the end of the discharge port 107 in the width direction D1. Was reduced to about 0.2. Therefore, in the flat die of the comparative form, the relative opening amount at the end of the discharge port 107 with respect to the center portion in the width direction D1 is reduced by about (1−0.2) = 0.8. This is because, in the flat die of the comparative form, the end portion in the width direction D1 of the discharge port 107 is restrained by the side plate 111.

  On the other hand, in the flat die 1 of the embodiment, in the width direction D1 of the discharge port 7, it is eliminated that the relative opening amount suddenly decreases, and gradually decreases from a position 1.5 m from the end toward the end. Yes. In the flat die 1 of the embodiment, the relative opening amount at the end in the width direction D1 of the discharge port 7 is about 0.9, and is suppressed to about 0.1 lower than the center of the discharge port 7. . Therefore, the flat die 1 of the present embodiment can suppress the decrease in the relative opening amount at both ends in the width direction D1 of the discharge port 7 to about 1/8, as compared with the flat die of the comparative embodiment. That is, in this embodiment, compared to the comparative embodiment, the difference in the relative opening between the center and both ends of the discharge port 7 can be reduced by about 7/8 (= about 88%).

  As described above, in the flat die 1 of the present embodiment, in the sealing mechanism 11, the first and second support members 13a and 13b are disposed on the side surfaces while the sealing member 12 keeps the groove 9 sealed. 8 can be displaced independently of the gap direction S of the groove 9. Thereby, since the change of the opening amount D at both ends in the width direction D1 of the discharge port 7 is not hindered, the opening amount D can be made uniform over the width direction D1 of the discharge port 7. As a result, the opening amount D can be made uniform over the width direction D1 of the discharge port 7, and the uniformity of the film thickness in the width direction of the film can be improved.

  In addition, the flat die for extrusion molding according to the present invention can be suitably applied to a flat die provided with an adjusting mechanism for adjusting the opening amount D of the discharge port. Since both ends in the width direction D1 of the discharge port are not restrained by the seal mechanism 11, the opening amount D can be adjusted with high accuracy without hindering the adjustment of the opening amount D of the discharge port by the adjusting mechanism. Become.

  Further, according to the flat die 1 of the present embodiment, the opening amount D at both ends in the width direction D1 of the discharge port 7 is ensured to be large, and the opening amount D is adjusted with high accuracy by using the adjustment mechanism described above. Therefore, the range of the viscosity of the resin material applicable to the flat die 1 can be widened, and it is possible to sufficiently cope with fluctuations in film manufacturing conditions. That is, according to the present embodiment, the film production conditions that can be dealt with are widened, and the versatility of the flat die can be enhanced, which can contribute to the improvement of film productivity.

  Finally, another embodiment will be briefly described.

  The sealing mechanism 11 in the present embodiment is configured to press the sealing member 12 against the side surface 8 of the die body 5 by the guide member 14a and the pressing screw 14b. However, a coil spring, a leaf spring, or the like can be attached as necessary. You may be comprised so that the sealing member 12 may be pressed via a biasing member. In this case, the biasing member is disposed between the id member 14 a and the sealing member 12. By using the urging member, the reliability of sealing the groove 9 by the sealing member 12 can be enhanced.

  In addition, a positioning concave portion or a positioning convex portion may be formed on the side surface 8 of the die body 5 as positioning means for positioning the position of the sealing member 12 with respect to the groove 9. 6A and 6B are schematic views of configuration examples of positioning concave portions and positioning convex portions for positioning the sealing member 12. For example, as shown in FIG. 6A, the positioning recess 21 is formed on the side surface 8 along the groove 9, and the sealing member 12 is disposed in the positioning recess 21 to seal against the groove 9. The member 12 can be easily positioned. Further, as shown in FIG. 6B, the positioning convex portion 22 is provided on the side surface 8 along the groove 9, for example, and the positioning convex portion 22 is notched to the outer peripheral portion of the sealing member 12. You may comprise so that it may engage with the recessed part 12a. The positioning recess 21 and the positioning protrusion 22 are formed so as not to hinder the displacement of the die body 5 with respect to the gap direction S of the groove 9, that is, the displacement of the die body 5 with respect to the opening / closing direction of the discharge port 7. In the embodiment shown in FIG. 6B, the positioning convex portion 22 engages with the engaging concave portion 12a. For this reason, when the first and second support members 13a and 13b are removed from the die body 5 for maintenance, the guide member 14a and the sealing member 12 can be prevented from falling.

  Further, as shown in FIG. 7, the through hole 13c that penetrates the second support member 13b in the longitudinal direction D1 of the discharge port, and the penetration that penetrates the guide member 14a in the longitudinal direction D1 of the discharge port coaxially with the through hole 13c. You may provide the hole 14c and the hole 12b extended in the longitudinal direction D1 of a discharge port coaxially with the through-hole 13c and the through-hole 14c in the sealing member 12. FIG. The hole 12b may penetrate the sealing member 12 in the longitudinal direction D1 of the discharge port, or may terminate in the middle. The pin 19 is passed through the through hole 13c, the through hole 14c, and the hole 12b. In maintenance, first the first support member 13 a is removed from the die body 5, and then the second support member 13 b is removed from the die body 5. Since the pin 19 inserted into the through hole 13c of the second support member 13b holds the guide member 14a and the sealing member 12, the guide member 14a and the sealing member 12 can be prevented from falling. The through hole 13c may be provided in the first support member 13a, or may be provided in both the first support member 13a and the second support member 13b. Even in the embodiment in which the guide member 14a is not provided, the same effect can be obtained by passing the pin 19 through the through hole 13c of the second support member 13b and the hole 12b of the sealing member 12.

  Moreover, the flat die for extrusion molding according to the present invention is not limited to a configuration including a die main body formed by combining a pair of main bodies. In order not to restrict the displacement of both ends in the width direction of the discharge port, it is necessary to form a groove on the side surface intersecting the width direction of the discharge port so as to communicate with the discharge port, and the groove is formed on the side surface of the die body. Of course, the provided structure may be applied to a die body formed by combining three or more bodies or a die body formed integrally.

DESCRIPTION OF SYMBOLS 1 Flat die 5 Die main body 7 Discharge port 8 Side surface 9 Groove 11 Seal mechanism 12 Sealing member 13a 1st support member 13b 2nd support member 14 Press member 14a Guide member 14b Press screw 15 Fixing screw D1 Width direction of discharge port D2 Groove width direction S Gap direction

Claims (6)

A slit-like discharge port that discharges the molten material, two side surfaces that intersect the longitudinal direction of the discharge port, and grooves that are respectively provided on each of the side surfaces and communicate with both ends in the longitudinal direction of the discharge port. A die body having,
A sealing mechanism that is provided on each of the side surfaces of the die body and seals the groove so that the gap of the groove is variable in a gap direction perpendicular to the longitudinal direction of the groove;
The sealing mechanism includes a sealing member that is disposed along the groove and closes the groove, a pressing unit that presses the sealing member against the side surface, and a pair that is fixed to the side surface while supporting the pressing unit. The first support member is fixed to one end of the side surface in the gap direction, and the second support member is in the gap direction. A flat die for extrusion molding, which is fixed to the other end of the side surface. The pressing means abuts the sealing member and guides the position of the sealing member relative to the groove; and
A screw that is screwed into the guide member so that one end abuts the sealing member, and that presses the sealing member against the side surface;
The first support member is brought into contact with the guide member at one end side in the gap direction so as to restrict the movement of the guide member with respect to the axial direction of the pressing screw, and at the other end side in the gap direction. The flat die for extrusion molding according to claim 1, wherein the second support member is in contact with the guide member so as to restrict movement of the guide member with respect to an axial direction of the pressing screw.   The flat die for extrusion molding according to claim 2, wherein the first and second support members are provided with guide portions for guiding the position of the guide member.   The flat die for extrusion molding according to any one of claims 1 to 3, wherein positioning means for positioning the sealing member with respect to the groove is provided on the side surface of the die body.   A through hole penetrating at least one of the first support member and the second support member in the longitudinal direction of the discharge port; and the longitudinal direction of the discharge port coaxially with the through hole of the sealing member The flat die for extrusion molding according to any one of claims 1 to 4, further comprising: a hole extending in a straight line; and a pin that passes through the through hole and the hole.   A step of discharging a molten material using the flat die for extrusion molding according to any one of claims 1 to 5, and a step of forming a film with the molten material discharged from the flat die for extrusion molding. A film forming method.

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