JP5107077B2 - Thermal displacement T-die, heat actuator adjuster, and film or sheet manufacturing method - Google Patents

Description

  The present invention relates to a thermal displacement T-die used in extrusion molding of a plastic film, sheet or the like (hereinafter, plastic film, sheet or the like is simply referred to as “film” in the description of the present invention). The present invention relates to an improvement of a thermal displacement T-die that adjusts an extrusion slit gap formed between a pair of lips by using expansion and contraction as a heat actuator.

  An extrusion slit is formed by a pair of lips in a T die as a mold for forming a film. At least one of the pair of lips is a flexible lip, and a plurality of die bolts that push and pull the flexible lip are attached to the mold body at intervals in the width direction of the extrusion slit. In order to equalize the thickness of the film to be formed in the width direction, each die bolt is manually operated to adjust the extrusion slit gap in the width direction.

A device that uses a T-die to extrude a film is designed so that the film extruded from the T-die is received and transferred by a plurality of rotating rolls close to the T-die. The environment is difficult to operate, and the vicinity of the T die is a high temperature atmosphere of 100 to 200 ° C., which makes the operation difficult.
In addition, while measuring the thickness of the film to be formed and correcting the thickness unevenness of the film in the width direction by operating a plurality of die bolts, a time delay occurs in the correction of the thickness unevenness. It has been difficult to produce a high-quality film having a uniform thickness.

Therefore, in order to reduce the time delay in correcting the thickness unevenness and reduce the burden on the manufacturing worker, development for automating the correction of the thickness unevenness has been advanced.
Many film forming apparatuses using a recent T-die are equipped with an automatic thickness profile control system that automatically corrects thickness unevenness in the width direction of the film.
As this automatic thickness profile control system, a scanning thickness meter that automatically measures the thickness of the film to be molded, and a heat actuator that utilizes thermal expansion and contraction by heating and cooling the die bolt that adjusts the extrusion slit gap were used. Many have a thermal displacement T-die and a control computer.

In this system, a film thickness profile measured by a scanning thickness meter is input to a computer, and smoothing processing (processing for smoothing the measured thickness unevenness) and dibolt mapping processing (measured thickness). Processing to determine the defense range of all die bolts on the profile is performed. Then, based on these data, the operation amount of each heat actuator, that is, the amount of power to heat the die bolt and / or the amount of air to cool is calculated, and the calculation result is output as an operation command to each heat actuator temperature operation unit. It has become.
In each heat actuator, the die bolt is heated or cooled based on the operation command, the die bolt is expanded and contracted, the extrusion slit gap is corrected, and the thickness of the film to be formed is equalized.

The film thickness profile measurement, measurement result processing, and adjustment of the extrusion slit in each heat actuator are performed at predetermined time intervals to form a film having a uniform thickness.
In this automatic thickness profile control system, various heat actuators have been proposed and used. Advantages of the heat actuator include compactness, low cost, no moving parts, so that it is difficult to break down even in a high temperature environment, simultaneous operation is possible, and the operation resolution is high (the operation step amount is small).
The most popular is the trade name AUTOFLEX die manufactured by EDI in the United States. The structure of the AUTOFLEX die II type in this die is disclosed in US Pat. No. 3,940,221 (Patent Document 1).

  FIG. 13 is described in FIG. 3 in this US Patent Publication, and shows a cross-sectional view at the position of the heat actuator in the direction perpendicular to the lip of the T die. In this T die, a heat bolt and manual operation bolt 60 are screwed and attached to an attachment flange 61 of the T die body 40 so that the operation end 63 pushes the flexible lip 44. A heat block 64 is attached to the outer periphery of the heat bolt / manual operation bolt 60 so as to cover the heat block 64, and a heat bolt heater 65 and a heat bolt cooling air hole 67 are installed in the heat block 64 along the heat bolt / manual operation bolt 60. Is provided. Heat insulation layers 70 and 71 are provided between the heat block 64 and the T die body 40, and the temperature of the heat block 64 can be adjusted independently of the heating temperature of the T die body 40.

In order to form a film using this AUTOFLEX die II type, first, the T-die body 40 is heated and the heat bolt / manual operation bolt 60 is heated to a predetermined temperature (depending on the type of plastic to be molded). Usually, the temperature is set to about 250 ° C.), and the head 62 of each heat bolt / manual operation bolt 60 is rotated with a wrench so that the operation end 63 of the heat bolt / manual operation bolt 60 is connected to the flexible lip 44. The degree of pressing is adjusted to adjust the extrusion slit gap corresponding to the film thickness to be formed.
Next, rough adjustment is performed while operating the extruder and causing the molten plastic to flow down from the T die. In this rough adjustment, the pattern at the leading edge of the flowing film is observed, and the manual adjustment is performed by rotating the heat bolt / manual operation bolt 60 to narrow the extrusion slit gap at the high flow velocity portion and widen the slow portion gap. Strict adjustment is not necessary in this adjustment process, and it is sufficient that the slow speed of the flow rate (some amount of flow) is improved.

  Next, while the film is being formed, manual adjustment is performed to drive the thickness unevenness into an allowable range based on the measurement data of the scanning thickness meter on the film forming line. The allowable range of thickness unevenness may be within about ± 10 to 15%, for example. Once manual adjustment has been made up to this point, the automatic thickness profile control system is activated to start film forming for automatically adjusting the thickness.

  However, in this AUTOFLEX die II type thermal displacement type T die, the heat bolt / manual operation bolt 60 is screwed to the mounting flange 61, and the head 62 of the operation bolt 60 is rotated with a wrench to operate the operation bolt 60. Since the end 63 is pressed against the flexible lip 44, the screw is a standard screw. Therefore, the movement dimension of the operation bolt 60 forward or backward per rotation of the operation bolt 60 becomes large, and there is a defect that the push-pull adjustment amount of the flexible lip 44 cannot be finely and finely adjusted. In order to allow slight movement and fine adjustment, fine screws with a small screw pitch may be used. However, fine screws cannot be used because they do not have sufficient strength to adjust the push and pull of the flexible lip 44. It was.

  In addition, the AUTOFLEX die II type thermal displacement type T die is structurally configured to push the flexible lip 44 with the operation end 63 of the operation bolt 60 and adjust the gap of the extrusion slit by adjusting the degree of pushing. Therefore, when the thickness of the film formed during automatic operation becomes thin, the heating temperature of the heater 65 is lowered so as to widen the gap between the extrusion slits, and cooling air is supplied to contract the operation bolt 60. Then, the operation end 63 of the operation bolt 60 may be separated from the flexible lip 44 and the function as an automatic T die for adjusting the extrusion slit gap may be lost. Therefore, automatic adjustment can be performed only when the flexible lip 44 is pushed (push-only), and there is a drawback that the range of thickness unevenness that can be adjusted, that is, the ability to correct thickness unevenness is limited.

In view of this, thermal displacement type T-dies having various manual adjustment mechanisms that have improved the disadvantage that the effective pitch of these screws is large and are push-only have been proposed and sold. These T dies can use a differential screw as an operation bolt to adjust the extrusion slit gap in a small amount. The flexible lip and the heat actuator are connected, and the operation bolt adjusts the extrusion slit gap. Since this is possible, the correction range of the film thickness unevenness is widened.
Further, the attachment of the push-pull adjustment type heat actuator to the T-die main body is screw coupling, and the gap of the extrusion slit is adjusted by turning the screw. Screw joints have backlash (play in the relative position between the two solids, such as occurs due to the minute gap between the male and female threads, or reverse movement due to play), so automatic adjustment by heat actuator In the process where the film thickness is reduced while the film is being formed, and the heat actuator moves from pushing to pulling, it must pass through the screw backlash area. As a function is lost. In order to prevent this, a back-up is often locked up by providing a lock-up bolt separately from the operation bolt.

Among them, there is the trade name AUTOFLEX die IV type manufactured by EDI of the United States. The structure of this AUTOFLEX die IV type will be explained based on the company's technical data.
FIG. 14 is a cross-sectional view at the position of the heat actuator in the direction perpendicular to the lip of the T die, and FIG. 15 is an exploded perspective view illustrating the state of attachment of the heat actuator to the T die. 14 and 15, a is a T die, a1 is a flexible lip, a2 is an extrusion slit, and a3 is a mounting flange. b is a heat actuator, b1 is a heat block, b2 is a push / pull type operation bolt, b3 is a lock-up bolt, b4 is a fixing member that connects the tip of the heat block b1 and the flexible lip a1, and b5 is a push / pull type. A mounting plate for mounting the operation bolt b2 in a pushable manner, b7 is a square nut fitted in a groove b51 formed in the mounting plate b5, and b6 is a centering pin. The centering pin b6 is a pin that connects the push / pull type operation bolt b2, the lockup bolt b3, and the heat block b1, and is provided with a female screw hole b61 in a direction perpendicular to the pin axis.
Both the push / pull type operation bolt b2 and the lock-up bolt b3 are threaded so as to advance forward when the right screw, that is, the head is turned clockwise.

A columnar hole b11 is provided in the heat block b1, and a heater b12 is inserted into the hole. By adjusting the power supplied to the heater, the heating temperature of the heat block b1 is adjusted, and the heat block b1 expands and contracts. The gap of the extrusion slit a2 is adjusted by pushing and pulling the flexible lip a1.
The heat block b1 is mounted such that its head b13 is attached to the mounting flange a3 of the T die a so as to be able to be pushed and pulled by a push / pull type operation bolt b2, and is locked up by a lockup bolt b3. .

The push / pull type operation bolt b2 is a differential screw having a large-diameter screw portion b21 having a large diameter and a large pitch on the head side, and a small-diameter screw portion b22 having a small diameter and a small pitch on the tip side. . The push / pull type operation bolt b2 is attached by screwing a large-diameter screw portion b21 into a screw hole of a square nut b7 which can move in the axial direction of the bolt through the mounting plate b5 in the axial direction of b5. The small-diameter screw portion b22 is screwed into the female screw hole b61 of the centering pin b6 through the hole formed in the mounting flange a3 of the T die a and the hole formed in the rear end surface of the head b13 of the heat block b1. b1 is attached to the T-die a.
When the head of the operation bolt b2 is grasped with a wrench and the operation bolt b2 is rotated clockwise, the large-diameter screw portion b21 is screwed into the square nut b7, the operation bolt b2 moves forward, and the small-diameter screw portion b22 is a centering pin. The centering pin b6 and the heat block b1 in which the pin b6 is fitted are advanced by being screwed into the female screw hole b61 of b6. Further, when the operation bolt b2 is rotated counterclockwise, the heat block b1 moves backward.

  Thus, by using the differential screw as the push / pull type operation bolt b2, when the push / push type operation bolt b2 is rotated, the large-diameter screw portion b2 has a large diameter by screwing with the square nut b7. The centering pin b6 to which the small-diameter screw portion b22 is screwed together by the forward or backward movement by an amount corresponding to the pitch of the screw portion b21 is screwed by the amount corresponding to the pitch of the small-diameter screw portion b22. The working pin b6 moves forward or backward by the difference between the pitch of the large-diameter screw portion b21 and the pitch of the small-diameter screw portion b22. For example, if the pitch of the large-diameter screw portion b21 is 1.25 mm and the pitch of the small-diameter screw portion b22 is 1.00 mm, the forward / backward movement of the push / pull type operation bolt b2 by one rotation is 0.25 mm. For this reason, the amount of forward or backward movement of the heat block b1 by the rotation of the operation bolt b2, that is, the adjustment of the extrusion slit gap can be adjusted in a very small amount, so that fine and fine manual adjustment is possible.

  Further, a standard screw is formed at the tip of the lock-up bolt b3, and the female screw hole of the centering pin b6 is passed through a hole provided in the head b13 of the heat block b1 through the through hole of the mounting plate b5 and the mounting flange a3. A standard screw is screwed into b61. When the head of the lockup bolt b3 is rotated and tightened toward the mounting plate b5, the standard screw is screwed into the female screw hole b61 of the centering pin b6, and the centering pin b6 is attracted to lock up the heat block b1. To do.

Next, a manual adjustment method of the AUTOFLEX die IV type configured as described above will be described. A case will be described in which the push-pull and combined use type operation bolt b2 of each heat bolt b1 is manually pushed and pulled so that the thickness unevenness falls within the allowable range immediately after the start of film forming.
FIGS. 16 and 17 are main part explanatory views showing changes in the screwed state of the operation bolt and nut by operation of the operation bolt and lockup bolt, and FIG. 18 is a state of movement of the heat block by operation of the operation bolt and lockup bolt. It is a typical explanatory view for explaining.
When manual adjustment is performed on the part where the film thickness is thick by the measurement data of the scanning thickness meter, that is, when manual operation is performed in the direction of pressing the heat block b (flexible lip a1) with the operation bolt b2 in order to narrow the lip interval. The positional relationship between the operation bolt b2 and the square nut b7 is as shown in FIG. 16, and the outer surface b72 of the square nut b7 is pressed against and contacts the inner surface b52 of the groove b51 of the mounting plate b5. That is, the pressure receiving surface is b72. Here, when the lockup bolt b3 is turned to lock up to determine the position, the positional relationship between the operation bolt b2 and the square nut b7 does not change, so that the lockup can be performed at an accurate position.

However, the following cases are problematic. That is, FIG. 17 shows a direction in which the lock-up bolt b3 of the heat actuator b is loosened by turning it counterclockwise after the film thickness is thin, and then the operation bolt b2 is turned counterclockwise to widen the gap of the extrusion slit a2. That is, the case where the heat block b1 is adjusted in the retreating direction is shown, and the screwed state of the large-diameter screw portion b21 of the operation bolt b2 and the square nut b7 is shown.
The operation bolt b2 is pulled in the direction of the flexible lip a1 by the load P1. Therefore, the contact surface of the screw is on the left side, and the contact surface b71 of the square nut b7 is in pressure contact with the surface a31 on the mounting flange a3 side of the left T die a. That is, the pressure receiving surface is b71. A backlash δ3 is provided between the male screw of the large-diameter screw portion b21 and the female screw of the square nut b7, and a play δ4 is provided between the right surface b72 of the square nut b7 and the inner surface b52 of the groove b51 formed in the mounting plate b5. Existing.

Here, in order to lock up, the lock-up bolt b3 is turned clockwise to lock up the operation bolt b2 and the heat block b1. The state shown in FIG. 16 is obtained by lockup. The contact surface between the male screw of the large-diameter screw portion b21 and the female screw of the square nut b7 has moved to the right side, and the contact surface b72 of the square nut b7 has also moved to the right side. Therefore, the heat block b1 is moved by δ3 + δ4 by the lockup by the lockup bolt b3, and the gap of the extrusion slit a2 is fixed widely by δ3 + δ4.
This means that when the film thickness is thin, even if the operation bolt b2 is manually operated to adjust the extrusion slit a2 to an appropriate slit gap, the slit gap becomes wider when the slit gap is locked up. It means that there is a problem of end.

  Next, the movement state of the heat block b1 by the operation of the operation bolt b2 and the lockup bolt b3 will be described with reference to FIG. FIG. 18A shows a manual adjustment state when the lockup bolt is turned counterclockwise to loosen the lockup, and the operation bolt b2 is turned counterclockwise to retract the heat block b1 (expanding the extrusion slit gap). 18A shows a state in which the operation bolt b2 is turned and manually adjusted, and FIG. 18B shows a state in which the heat block b1 is locked up by turning the lockup bolt b3 clockwise.

In FIG. 18A, the centering pin b6 is pulled by the small-diameter threaded portion b22 of the operation bolt b2 by the counterclockwise rotation of the operation bolt b2, and thereby the inner surface of the through hole b14 provided in the heat block b1 and the centering There is a play δ1 on the left side of the centering pin b6 between the outer surface of the pin b6 and a backlash δ2 between the male screw of the small diameter screw portion b22 and the female screw of the female screw hole b61 of the centering pin b6 (not shown). Exists.
Next, FIG. 18B shows a state where the lockup bolt b3 is rotated clockwise and the heat block b1 is pulled back and locked up after manual adjustment as in the above (a), and the play δ1 is used for centering. The pin b6 moves from the left side to the right side. This means that the heat block b1 has moved backward by δ1 due to the lockup, and the extrusion slit gap has been manually adjusted accordingly. At the same time, the backlash δ2 between the male screw of the small-diameter screw portion b22 and the female screw b61 of the centering pin b6 is also locked up and retracted by δ2. In total, the extrusion slit gap is manually adjusted by δ1 + δ2.

FIGS. 18C and 18D show a manual adjustment state when the operation bolt b2 is rotated clockwise to advance the heat block b1 (when the extrusion gap is narrowed), and FIG. 18C shows the operation bolt b2. (D) shows a state in which the heat block b1 is locked up by turning the lock-up bolt b3 clockwise.
In FIG. 18C, when the centering pin b6 is pushed by the small-diameter threaded portion b22 of the operation bolt b2 by the clockwise rotation of the operation bolt b2, the inner surface of the through hole b14 provided in the heat block b1 and the centering pin Between the outer surface of b6, there is a play δ1 on the right side of the centering pin b6. Although not shown, there is a backlash δ2 between the male screw of the small-diameter screw portion b22 and the female screw of the female screw hole b61 of the centering pin b6.
Next, FIG. 18D shows a state in which, after the manual adjustment of FIG. 18C, the lock-up bolt b3 is turned clockwise and the heat block b1 is pulled back to lock up. The heat block b1 is in a state in which the centering pin b6 is pushed by the manual adjustment. Therefore, even if the heat block b1 is locked up, the play δ1 is maintained on the right side of the centering pin b6, and the backlash δ2 is locked up. The position of the heat block b1 does not move. This means that if the heat block b1 is manually adjusted while being pushed, the position of the heat block b1 is unchanged and is accurately manually adjusted.

  As described above, in the above-mentioned AUTOFLEX die IV type thermal displacement type T die, when the manual adjustment is performed so that the heat block b1 is retracted (the gap between the extrusion slits a2 is widened), as described above, the post-adjustment lockup bolt b3 When the lock-up is performed, the adjusted slit gap is δ1 (play of the centering pin b6) + δ2 (backlash between the female screw hole b61 and the small-diameter screw portion b22 of the operation bolt b2) + δ3 (operation with the square nut b7) There is a defect that the backlash between the bolt b2 and the large-diameter threaded portion b22) is widened by +4 (play of the square nut b7).

  Therefore, by manually adjusting the heat block b1 to advance (narrow the gap of the extrusion slit a2), it can be manually adjusted without changing the gap of the extrusion slit a2 at the time of lockup. When the thickness is thin, the heat actuator in the thin film portion must be manually adjusted so that the film thickness is thick, and then manually adjusted to advance the heat block b1. Adjustment takes time, and raw materials required for thickness adjustment are wasted.

Also, grasp the characteristics of the T-die to be used, and lock up the gap of the extrusion slit a2 with the operation bolt b2 when performing manual adjustment to retract the heat block b1 (expand the gap of the extrusion slit a2). It is theoretically possible to make the adjustment narrower by a gap that becomes wider and to adjust to a predetermined gap after the lock-up bolt b3 locks up. However, such manual adjustment can be performed only by a veteran worker, and even a veteran person cannot adjust the film thickness range to a predetermined range unless the adjustment is repeated several times.
US Pat. No. 3,940,221 (FIG. 3)

  In view of the above-described problems, the present invention provides a thermal displacement T-die that can be locked up while maintaining the adjustment state even if the heat block is adjusted to move forward and backward in manual adjustment in the thermal displacement T-die. This is a proposal.

  The thermal displacement T-die according to claim 1 is a T-die in which an extrusion slit is formed by a pair of lips, at least one lip being a flexible lip, and the extrusion slit gap is mounted in the width direction of the flexible lip. In a heat displacement T-die that forms a film or sheet having a uniform thickness by adjusting the push-pull adjustment of the plurality of heat actuators, the heat actuator includes a moving operation means that can push-pull with respect to the T-die body. It is characterized in that it is mounted so as to be manually adjustable by lock-up means that can be locked up in both pushing and pulling directions without changing the state adjusted by the moving operation means.

  The thermal displacement T-die according to claim 2 is the thermal displacement T-die according to claim 1, wherein the moving operation means is a manual operation bolt and the lock-up means is a lock-up bolt. It is what.

A thermal displacement T-die according to claim 3 is the thermal displacement T-die according to claim 2, wherein the manual operation bolt is a differential screw.
Further, the thermal displacement T-die according to claim 4 is the thermal displacement T-die according to claim 2 or claim 3, wherein the lock-up bolt has a certain range of axial movement of the lock-up bolt in both directions. An annular stopper rod or an annular stopper groove for constraining is provided, and both end surfaces in the axial direction of this stopper rod or stopper groove are counterbored holes or fixed formed in the position fixing tool of the heat actuator to the T-die body The heat actuator is brought into contact with the pin and is locked up in both directions of pushing and pulling of the lockup bolt.

  Further, in the heat actuator adjusting tool according to claim 5, at least one lip of the T die in which the extrusion slit is formed by a pair of lips is a flexible lip, and the extrusion slit gap is mounted in the width direction of the flexible lip. A heat actuator adjuster for use by attaching to a heat displacement T-die for forming a film or sheet having a uniform thickness by adjusting the plurality of heat actuators formed by pushing and pulling. Can be manually adjusted by a manual operation bolt that can be pushed and pulled with respect to the T-die body, and a lockup bolt that can be locked up in both directions without changing the state adjusted by the manual operation bolt. And the axial direction of the lockup bolt is the axial direction of the heat actuator A position fixing tool that is substantially parallel and is attached to the T die at a certain distance from the T die, and has a space between the T die and the manual operation bolt is attached to the position fixing tool by screwing. And a male screw provided at one end of the manual operation bolt is screwed into a female screw provided in an idler that can be advanced and retracted in parallel with the axial direction of the heat actuator stored in the space of the position fixing tool. The other end is rotatable from the outside, and the play tool is provided with another female screw parallel to the axial direction of the heat actuator, in addition to the female screw. The tool is connected to a heat actuator, the male screw at one end of the lock-up bolt is screwed to the other female screw of the play tool, and the other end can be rotated from the outside. The lock It is characterized in that the axial advance and retreat of up bolts is limited to the deformation range of the flexible lip in both directions-out push-pull by the stopper flange or stopper groove.

  The thermal displacement T-die according to claim 6 is a T-die in which an extrusion slit is formed by a pair of lips, at least one lip being a flexible lip, and the extrusion slit gap is formed in the width direction of the flexible lip. 6. A heat displacement type T-die for forming a film or sheet having a uniform thickness by adjusting a plurality of heat actuators mounted on the heat actuator, wherein the heat actuator adjustment tool according to claim 5 is mounted. It is characterized by.

  The film or sheet production method according to claim 7 is produced by using the thermal displacement T-die according to any one of claims 1 to 4 or claim 6 in a film or sheet production method by extrusion. It is characterized by this.

  In the thermal displacement type T-die according to claim 1 of the present invention, the heat actuator locks up in both directions of pushing and pulling without changing the state adjusted by the moving operation means that can be pushed and pulled with respect to the T die body. Since it is mounted so that it can be adjusted manually by a possible lock-up means, the temperature of the heat actuator is the upper and lower limit temperature during manual adjustment of the extrusion slit gap when starting film extrusion and automatic thickness adjustment molding by the heat actuator (In a general steel heat actuator, the upper limit temperature is 400 ° C and the lower limit temperature is about 100 ° C.) In manual adjustment, the extrusion slit gap is adjusted in both directions, and the adjusted gap is maintained. It is possible to lock up, and manual adjustment of the extrusion slit gap can be performed accurately and easily

That is, as in the thermal displacement type T-die according to claim 2, the moving operation means is a manual operation bolt and the lock-up means is a lock-up bolt, and the manual adjustment is performed in the direction of pulling the manual operation bolt. If the lock-up bolt is tightened in the pushing direction to lock up, the adjusted extrusion slit gap can be maintained and locked up, and the manual adjustment of the extrusion slit gap can be performed accurately and easily.
In addition, since the manual operation bolt is a differential screw in the thermal displacement type T-die according to claim 3, the manual operation bolt can be finely and finely adjusted, and the extrusion gap can be adjusted more accurately and easily. be able to.

  Further, in the thermal displacement T-die according to claim 4, the lockup bolt is provided with an annular stopper rod or an annular stopper groove for restricting the axial movement of the lockup bolt within a certain range in both directions. Both end faces in the axial direction of this stopper rod or stopper groove abut against counterbore holes or fixing pins formed in the position fixing tool of the heat actuator to the T-die body, so that the heat actuator moves in both directions of the lock-up bolt. Since it is locked up, it can be locked up in both the front and rear directions in the axial direction of the lockup bolt with a simple structure, and the modification of the conventionally used heat actuator can be made inexpensively.

  Further, in the heat actuator adjusting tool according to claim 5, at least one lip of the T die in which the extrusion slit is formed by a pair of lips is a flexible lip, and the extrusion slit gap is mounted in the width direction of the flexible lip. A heat actuator adjuster for use by attaching to a heat displacement T-die for forming a film or sheet having a uniform thickness by adjusting the plurality of heat actuators formed by pushing and pulling. Can be manually adjusted by a manual operation bolt that can be pushed and pulled with respect to the T-die body, and a lockup bolt that can be locked up in both directions without changing the state adjusted by the manual operation bolt. And the axial direction of the lockup bolt is the axial direction of the heat actuator A position fixing tool that is substantially parallel and is attached to the T die at a certain distance from the T die, and has a space between the T die and the manual operation bolt is attached to the position fixing tool by screwing. And a male screw provided at one end of the manual operation bolt is screwed into a female screw provided in an idler that can be advanced and retracted in parallel with the axial direction of the heat actuator stored in the space of the position fixing tool. The other end is rotatable from the outside, and the play tool is provided with another female screw parallel to the axial direction of the heat actuator, in addition to the female screw. The tool is connected to a heat actuator, the male screw at one end of the lock-up bolt is screwed to the other female screw of the play tool, and the other end can be rotated from the outside. The lock The heat displacement type T-die according to claim 6, wherein the heat actuator adjusting tool is mounted, because the up-and-down movement of the up bolt in the axial direction is limited to the deformation range of the flexible lip in both pushing and pulling directions by the stopper rod or the stopper groove. The temperature of the heat actuator during the manual adjustment of the extrusion slit gap at the start of film extrusion and the automatic thickness adjustment molding by the heat actuator is the upper and lower limit temperature (the upper limit temperature is 400 ° C. in a general steel heat actuator) In the manual adjustment when exceeding the lower limit temperature of about 100 ° C., the extrusion slit gap can be adjusted in both the pushing and pulling directions, and the adjusted gap can be maintained and locked up. Manual adjustment can be performed accurately and easily.

  According to a seventh aspect of the present invention, there is provided the film or sheet manufacturing method, wherein the heat actuator is locked in both the push-pull directions without changing the state adjusted by the moving operation means that can be pushed and pulled with respect to the T-die body. It is mounted so that it can be manually adjusted by the lock-up means that can be raised, so the temperature of the heat actuator will be the upper and lower limits during manual adjustment of the extrusion slit gap when starting film extrusion and automatic thickness adjustment molding by the heat actuator In manual adjustment when the temperature is exceeded (in the case of a general steel heat actuator, the upper limit temperature is 400 ° C and the lower limit temperature is about 100 ° C), the extrusion slit gap is adjusted in both directions, and the adjusted gap is maintained. Can be locked up, and manual adjustment of the extrusion slit gap can be performed accurately and easily. It is possible.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples shown in the drawings.
FIG. 1 shows an embodiment of a thermal displacement T-die according to the present invention. FIG. 2 is a cross-sectional view in a direction perpendicular to the T-die slit at the position of the heat actuator mounted on the T-die body, and FIG. 3 is a plan view of a heat bolt that is a part of the heat actuator shown in FIG. 1, FIG. 4 is a front view of FIG. 3, FIG. 5 is a front view of an example of a manual operation bolt, and FIG. FIG. 7 is a plan view of a position fixture that is a part of the heat actuator shown in FIG. 1, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7, and FIG. FIG. 10 is a cross-sectional view taken along the line XX of FIG. 9, and FIG. 11 is a diagram of the lock-up bolt when adjusted in the direction of pushing the manual operation bolt. Up state partially enlarged view for explaining FIG. 12 is a partial enlarged view for describing a lockup state of the lockup bolts when adjusted in the direction of pulling the manual operation bolt.

In FIG. 1, 10 is a T-die body, 11 is an extrusion slit, and 12 is a flexible lip. A is a heat actuator, and includes a heat bolt 20 and a mounting member 30 that mounts the heat bolt on the flexible lip 12 of the T-die body 10.
The heat bolt 20 was adjusted by an expansion / contraction member 21 that expands and contracts by heating and cooling, a manual operation bolt 22 that is a moving operation means for attaching the expansion / contraction member 21 to the flexible lip 12 so as to be capable of being pushed and pulled, and a manual operation bolt 22. It has a lockup bolt 23 which is a lockup means capable of locking up the heat bolt 20 in both pushing and pulling directions without changing the state.

  As shown in FIGS. 1 to 4, the telescopic member 21 has a heater 212 embedded in a hollow hole 211 inside thereof, and a floating tool 213 that screw-couples the manual operation bolt 22 and the lockup bolt 23 to the head. Has been. The play tool 213 is formed with a female screw hole 214 coaxially with the central axis of the telescopic member 21, and a manual operation bolt 22 made of a differential screw is screwed to the female screw hole 214. A female screw hole 215 is formed in parallel with the female screw hole 214, and the lockup bolt 23 is screwed to the female screw hole 215. The outer shape of the joint portion of the play tool 213 with the telescopic member 21 is a regular hexagon. A female screw connection portion 216 is formed at the lower end of the elastic member 21, and an extension member 217 (see FIG. 1) is connected to the connection portion 216. The extension member 217 is adjusted and connected so that the lower end of the extension member 217 contacts the flexible lip 12.

  The extension member 217 is inserted through a through hole 219 provided in the T-die body 10. When the heat bolt 20 is attached to the T-die main body in this way, the front end portion of the heat bolt 20 can be slidably held firmly. If metal collars are attached to the upper and lower end portions of the through hole 219 to reduce the gap between the through hole 219 and the extension member 217, it is possible to prevent run-out of the tip portion.

A hook 218 that holds the flexible lip 12 is attached to the lower end of the extension member 217. The heater 212 embedded in the expansion / contraction member 21 is connected to an energization cable through a through hole provided in the wall surface of the expansion / contraction member 21 and is supplied with electric power.
The mounting member 30 accommodates the two fixing rods 31 and 32 for fixing the heat actuator A to the T-die body 10, the fixing plate 33 at the upper end of the fixing rod, and the play tool 213 of the telescopic member 21 on the fixing plate 33. It is comprised from the gate-shaped mounting base 34 which has the space for, and the position fixing tool 35 attached on this mounting base 34. As shown in FIG.

The two fixing rods 31 and 32 are screwed and attached to a female screw hole formed in a step-like attachment seat 13 provided on the outer surface of the T-die body 10. A fixing plate 33 is fixed to the upper ends of the two fixing rods 31 and 32 by mounting bolts 36 and 37.
As shown in FIGS. 9 and 10, the fixing plate 33 has a hexagonal through-hole 333 formed at a position where the play tool 213 provided on the head of the telescopic member 21 is inserted, and is used for the mounting bolt 37. A counterbore hole 335, a through hole 334 for the mounting bolt 36, and a female screw hole 336 are formed. The outer shape of the through hole 333 and the play tool 213 is hexagonal, so that the telescopic member 21 moves without rotating. The female screw hole 336 is for fixing the position fixing tool 35 and the portal mounting base 34 to the fixing plate 33 with the mounting bolt 38.

Here, the manual operation bolt 22 and the lockup bolt 23 will be described.
FIG. 5 shows an example of a manual operation bolt. The manual operation bolt 22 is a differential screw having a large diameter screw portion 221 having a large diameter and a large pitch and a small diameter screw portion 222 having a small diameter and a small pitch. The head 223 has a hexagonal outer periphery and is provided with a hexagonal hole at the end so that it can be operated with a spanner or a hexagon wrench. The large-diameter screw portion 221 is a first-class screw having an outer diameter of 12 mm and a pitch of 1.25 mm, and the small-diameter screw portion 222 is a first-class screw having an outer diameter of 10 mm and a pitch of 1.00 mm.
FIG. 6 shows an example of a lock-up bolt. The lock-up bolt 23 is a first-class coarse screw having a threaded portion 231 of 10 mm in outer diameter, and the head 232 has a hexagonal outer periphery and a hexagonal hole at the end, and can be operated with a spanner or a hexagonal wrench. ing. A stopper rod 233 made of an annular rod is formed on the outer periphery of the intermediate position.

  Next, the position fixing tool 35 will be described. As shown in FIGS. 7 and 8, the position fixing device 35 includes a female screw hole 351 into which the large-diameter screw portion 221 of the manual operation bolt 22 is screwed, and a counterbore hole in which the stopper rod 233 of the lockup bolt 23 is received from below. 352 and counterbore holes 353 and 354 for receiving the heads of the mounting bolts 36 and 38 are provided. The counterbore hole 352 is preferably sized to accommodate the stopper rod 233 of the lock-up bolt 23 with a play of about 3 mm in the axial direction.

  A gate-shaped mounting base 34 is disposed on the fixing plate 33, and a position fixing tool 35 is disposed thereon, and is fixed by the mounting bolts 38 screwed into the mounting bolts 36 and the female screw holes 336 of the fixing plate 33. The When fixing with the mounting bolts 36 and 38, the large-diameter screw portion 221 of the manual operation bolt 22 is screwed into the female screw hole 351 of the position fixing tool 35, and the stopper rod 233 of the lockup bolt 23 is screwed into the counterbore hole 352 of the position fixing tool 35. After that, the small diameter screw portion 222 of the manual operation bolt 22 is screwed to the female screw hole 214 of the play tool 213, and the screw portion 231 of the lockup bolt 23 is screwed to the female screw hole 215. And 38 are fastened and fixed.

The gate-shaped mounting base 34 forms a housing space for the play equipment 213. The through holes formed in the gate-shaped mounting base 34 include the manual operation bolt 22, the lock-up bolt 23, the mounting bolt 36, Any inner diameter that allows 38 to be inserted is acceptable.
In the present invention, the thickness of the film to be molded is always measured by a scanning thickness meter and sent to a control device. In the control device, the thickness unevenness of the extrusion slit in the width direction is analyzed, the heating temperature of each heat actuator A is estimated, and the amount of power supplied to the heater 212 of the expansion / contraction member 21 is adjusted and controlled. When the heating temperature is lowered, it is preferable that the cooling air be blown toward the expansion / contraction member 21 so as to accelerate the temperature drop. In addition, the control device issues an alarm when the thickness unevenness cannot be resolved over a certain period of time.

Next, an example of the operation method which shape | molds a film using the thermal displacement type | mold T die of this invention comprised as mentioned above is demonstrated.
First, the extruder and the T-die body 10 are heated so that the molten resin can be extruded, and the heat actuator A of the T-die body 10 is adjusted so that the heat bolt 20 becomes 250 ° C., for example. In this state, the gap of the extrusion slit 11 of the T-die body is adjusted using a gap gauge or the like to the gap corresponding to the film thickness to be formed. After the lockup bolts 23 of all the heat actuators A are loosened, the manual operation bolts 22 are adjusted so that a predetermined slit gap is obtained. In the adjustment at this time, it is preferable that all the heat actuators A are adjusted by operating the manual operation bolt 22 so that the flexible lip 12 is pushed by the tip of the heat bolt 20 after adjustment a little wider than the predetermined slit gap. . This is because the slit gap can be set with no distortion in the flexible lip 12.

Next, rough adjustment is performed while operating the extruder and causing the molten plastic to flow down from the extrusion slit 11 of the T die. In this rough adjustment, the pattern at the leading edge of the film flowing down is observed, and manual adjustment is performed by rotating the manual operation bolt 22 to narrow the extrusion slit gap at the high flow velocity portion and widen the slow portion gap. Strict adjustment is not necessary in this adjustment process, and it is sufficient if the slow speed of the flow rate (somewhat flow rate) is improved.
Next, while the film is being formed, manual adjustment is performed to drive the thickness unevenness into an allowable range based on the measurement data of the scanning thickness meter on the film forming line. The allowable range of thickness unevenness may be within about ± 10 to 15%, for example. In the adjustment so far, the lock-up bolt is not loosened and the lock-up bolt is loosened. Once manual adjustment has been made so far, the lockup bolts 23 of all the heat actuators A are tightened to lock up the heatbolts 20, and the automatic thickness control device is activated to automatically adjust the thickness. .

During the automatic thickness adjustment film forming by operating the automatic thickness control device, the automatic adjustment may not be sufficiently performed for some reason, and the film thickness may be increased or decreased. In such a case, since an alarm is issued from the automatic thickness control device, it is necessary for the operator to make an adjustment manually.
In this invention, in order to manually adjust the film thickness during the automatic thickness control molding of the film, it is determined how to adjust the heat actuator A in which part of the extrusion slit 11 from the information of the scanning thickness meter. You can decide and start the adjustment work.

  When the film is thick, the lock-up bolt 23 of the heat actuator A at the corresponding position is loosened by turning counterclockwise, and the manual operation bolt 22 of the heat actuator A at the corresponding position is pushed ( Adjust clockwise by a predetermined angle. When the thickness unevenness is improved as a result of the adjustment, the lockup bolt 23 is turned clockwise to lock up the heat bolt 20 in the pullback direction. If the thickness unevenness is not sufficiently adjusted by one manual adjustment, the adjustment may be performed again.

The adjustment by the manual operation bolt 22 and the lockup by the lockup bolt 23 will be described in detail.
By adjusting the manual operation bolt 22, the play tool 213 is pressed in the direction of the extrusion slit 11 of the T die 10. That is, the rear surface (the surface on the head 232 side) of the thread of the large-diameter screw portion 221 of the manual operation bolt 22 is abutted with and screwed with the thread groove surface of the female screw hole 351 of the position fixing tool 35 so that the operation bolt 22 is Advance. As the operating bolt 22 advances, the forward-facing surface of the thread of the small-diameter screw portion 222 is adjusted in such a direction as to contact the thread groove of the female screw 214 of the play tool 213 and push the play tool 213. The film thickness can be adjusted by changing the angle at which the operation bolt 22 is turned. For example, when the small-diameter threaded portion 222 of the operation bolt 22 made of a differential screw advances 250 μm by one rotation of the operation bolt 22, the operation bolt 22 may be rotated 72 degrees to adjust the width 50 μm narrower.

  Next, when the lock-up bolt 23 (right screw) is turned clockwise for lock-up, the screw portion 231 of the lock-up bolt 23 is screwed into the female screw hole 215 of the play tool 213, so that the lock-up bolt 23 is screwed. 23 moves forward.

Further, the lockup bolt 23 is turned clockwise to continue the lockup operation.
FIG. 11 shows the positional relationship between the stopper rod 233 of the lock-up bolt 23 and the counterbore hole 352 of the position fixture 35 when the lock-up bolt 23 is locked up. When the lock-up bolt 23 moves forward, the lower surface 235 of the stopper rod 233 is pressed against the upper surface 341 of the gate-shaped mounting base 34, and the play tool 213 is attracted to be locked up. Here, when the lockup is completed, it is further lightly tightened in the same direction (clockwise), so that the male screw 231 of the lockup bolt 23 is screwed into the female screw hole 215 of the play tool 213, so that the play tool 213 faces upward. Be attracted. However, since the play tool 213 is adjusted to be pushed down by the small-diameter threaded portion 222 of the operation bolt 22, even if the play tool 213 is pulled upward by the lock-up bolt 23, the position of the play tool 213 is increased only by increasing the lock-up load. It does not change and is fixed at the position adjusted manually.

  In this way, manual adjustment of the film thickness is adjusted in the direction in which the heat actuator A is pushed by the manual operation bolt 22, and the lockup bolt 23 is advanced and locked up so as to hold this pushed state, the manual operation bolt 22 The thread backlash is locked up. In this case, the position of the heat bolt 20 is unchanged before and after the lock-up operation.

  Also, when the film thickness is reduced during the automatic adjustment operation and the slit gap is widened automatically, that is, when the heating temperature of the heat actuator A is lowered to contract the heat actuator A, the play equipment 213 is Since it is pulled upward by the threaded portion 231 of the lockup bolt 23 that is screwed into the female threaded hole 215, the lockup state due to the threaded state of the female threaded hole 214 of the play tool 213 and the small diameter threaded portion 222 of the operating bolt 22 is Since it is maintained, the lock-up state does not loosen. Therefore, since the push / pull adjustment by heating / cooling of the heat actuator A can be performed, a wide adjustment range of the film thickness can be secured.

  On the other hand, when the film thickness is thin, the lockup bolt 23 of the heat actuator A at the corresponding position is loosened by turning clockwise, and the manual operation bolt 22 is pulled by a predetermined angle (counterclockwise). When the thickness unevenness is improved as a result, the heat bolt 20 is locked up by turning in the direction in which the lock-up bolt 23 is pushed (counterclockwise). If the thickness unevenness is not sufficiently adjusted by one manual adjustment, the adjustment may be performed again.

The adjustment by the manual operation bolt 22 and the lockup by the lockup bolt 23 will be described in detail.
By adjusting the manual operation bolt 22, the play tool 213 is pulled in the direction opposite to the extrusion slit 11 of the T die 10. That is, the front face of the thread of the large-diameter screw portion 221 of the manual operation bolt 22 (surface opposite to the head portion 232) is in contact with the thread groove surface of the female screw hole 351 of the position fixing tool 35 and screwed together. 22 moves backward. By the retraction of the operation bolt 22, the backward surface of the thread of the small-diameter screw portion 222 is adjusted in a direction in which the play tool 213 is pulled by coming into contact with the thread groove of the female screw 214 of the play tool 213. The film thickness can be adjusted by changing the angle at which the operation bolt 22 is turned. For example, when the small-diameter screw portion 222 of the operation bolt 22 formed of a differential screw moves backward by 250 μm by one rotation of the operation bolt 22, the operation bolt 22 may be rotated 72 degrees to adjust the thickness to 50 μm.

  Next, when the lock-up bolt 23 (right screw) is turned counterclockwise for lock-up, the screw portion 231 of the lock-up bolt 23 is screwed back into the female screw hole 215 of the play tool 213, and is locked. The up bolt 23 moves backward.

Further, the lockup bolt 23 is turned counterclockwise to continue the lockup operation.
FIG. 12 shows the positional relationship between the stopper rod 233 of the lock-up bolt 23 and the counterbore hole 352 of the position fixture 35 when the lock-up bolt 23 is locked up. When the lock-up bolt 23 is retracted, the upper surface 234 of the stopper rod 233 is pressed against the counterbore surface 355 of the counterbore hole 352 and is locked up by pressing the play tool 213. Here, since the lock-up is completed, the male screw 231 of the lock-up bolt 23 is screwed into the female screw hole 215 of the play tool 213 by further tightening lightly in the same direction (counterclockwise). Pushed down. However, since the play tool 213 is adjusted to be pulled up by the small-diameter threaded portion 222 of the operation bolt 22, even if the play tool 213 is pushed downward by the lock-up bolt 23, the position of the play tool 213 is increased only by increasing the lock-up load. It does not change and is fixed at the position adjusted manually.

  In this way, manual adjustment of the film thickness is adjusted in the direction in which the heat actuator A is pulled by the manual operation bolt 22, and when the lockup bolt 23 is retracted and locked up so as to maintain this pulling state, the manual operation bolt 22 However, the position of the heat bolt 20 remains unchanged before and after the lock-up operation.

  Also, when the film thickness is increased during the automatic adjustment operation and the slit gap is narrowed automatically, that is, when the heating temperature of the heat actuator A is increased to extend the heat actuator A, the play equipment 213 is Since it is pushed downward by the screw portion 231 of the lockup bolt 23 that is screwed into the female screw hole 215, the lockup state due to the screwed state between the female screw hole 214 of the play tool 213 and the small diameter screw portion 222 of the operation bolt 22 is The lock-up state is not loosened. Therefore, since the push / pull adjustment by heating / cooling of the heat actuator A can be performed, a wide adjustment range of the film thickness can be secured.

  As described above, in each heat actuator A that adjusts the extrusion slit, when the manual operation bolt 22 is adjusted in the pushing direction, the lockup bolt 23 is pulled up and the manual operation bolt 22 is pulled. In the case where the adjustment is performed in the above, if the lock-up bolt 23 is locked up in the direction in which the lock-up bolt 23 is pushed, the lock-up can be performed while maintaining the manually adjusted state.

In the description of the best mode for carrying out the invention described above, an annular stopper rod is provided on the lockup bolt in order to restrict the axial movement of the lockup bolt within a certain range in both directions. Although an example has been described, in the present invention, an annular stopper groove may be provided instead of the annular stopper rod.
When the lock-up bolt is provided with an annular stopper groove, after the lock-up bolt is inserted into the position fixing tool of the heat actuator, a fixing pin is attached in parallel with the stopper groove, and the width of the stopper groove is the thickness of the fixing pin. The lock-up bolt is attached so as to be movable in the axial direction by an amount larger than that. The movement length of the lockup bolt may be about 3 mm.
The manual adjustment method in this case may be the same as the lock-up bolt lock-up method provided with the stopper rod.
Further, the stopper rod or the stopper groove may be provided in a portion other than the threaded portion of the lockup bolt, and may be provided, for example, in an extension portion of the bolt tip.

  Thus, in the thermal displacement type T-die of the present invention, not only when adjusting in the pushing direction in order to reduce the film thickness, but also in manual adjustment in the pulling direction in order to increase the film thickness, Since the position is fixed by lock-up while maintaining the position where manual adjustment by the operation bolt is held, manual adjustment of the extrusion slit gap can be performed accurately and easily without causing play by lock-up operation. .

In Example 1, as an extruder, a cylinder diameter D = 40 mm, a ratio L / D = 32 between the cylinder diameter D and the cylinder length L, and a screw used was a double flight + spiral Madox screw.
A T-die having an extrusion slit width of 600 mm and 23 heat actuators A mounted at a pitch of 25.4 mm was used. The heat actuator A at both ends was not used for automatic control but was used only for manual adjustment. The control of the heat actuator A is equipped with a "Heatbolt controller" manufactured by Yamabun Electric Co., Ltd., and the film thickness measurement is equipped with an "X-ray automatic film thickness meter" manufactured by Yamabun Electric Co., Ltd. Yes.

In addition, a gear pump is attached to a connecting portion between the extruder and the T die so that the molten resin is supplied to the T die without fluctuation.
The molten film extruded from the T-die is wound around a cooling roll provided close to the T-die slit, and is further passed over two cooling rolls provided in parallel to be cooled. It has become so.
With this T-die extruder, low density polyethylene (melt index = 2) was melt extruded to form a film.
The extrusion apparatus was heated at an extruder raw material supply unit 170 ° C., a metering unit 200 ° C., a T-die 200 ° C., and a gear pump 200 ° C. The cooling roll is cooled.

After the extruder was sufficiently heated, the extruder was driven at a screw speed of 60 rpm. The ammeter command was 30 A, the extrusion rate was 13.5 kg / hr, the molten resin pressure at the tip of the extruder was 13.5 MPa, and the molten resin pressure at the outlet of the gear pump was 7.5 MPa.
Adjust the lip gap of the T die with the 23 manual operation bolts of the heat actuator A, and confirm that the thickness variation on the film thickness gauge is within ± 13%. Locked up to the die body with lockup bolts. A film having a width of 550 mm was formed by trimming both ends of the film to be formed.
The film molded in this state had an accuracy of ± 7.2%.

Next, the automatic thickness controller of the heat actuator A was driven, and the film formed after 32 minutes had a thickness of 386 to 405 micrometers (μm) and an accuracy of ± 1.3%.
From the above Example 1, it was confirmed that a film excellent in thickness system can be formed in the thermal displacement T-die of the present invention.

  In Example 1, in order to confirm the state of manual adjustment when an uncontrollable state occurs during the automatic thickness control operation, the two heat actuators A in the center portion of the T die slit are intentionally The operation was as follows.

  Case 1: The lockup bolts of the two heat actuators A at the center portion were loosened, the manual operation bolt was turned counterclockwise, the heat bolt 20 was drawn, and the extrusion slit gap was widened. The film thickness increased with the passage of time, and adjustment with the heat actuator A was not possible, and an alarm was issued. In the manual adjustment in this case, first, the manual operation bolt was turned clockwise to narrow the extrusion slit gap so that a predetermined film thickness was obtained. When the film thickness measured by the film thickness meter returned to the predetermined thickness, the lockup bolt was turned clockwise to lock up the heat bolt in the pulling direction. There was no change in film thickness before and after lockup. Thereafter, the film thickness automatic control device was activated to form a film having the same thickness accuracy as the film.

  Case 2: The lock-up bolts of the two heat actuators A at the center part were loosened, the manual operation bolt was turned clockwise, the heat bolt 20 was pushed in, and the extrusion slit gap was narrowed. The film thickness decreased with the passage of time, and adjustment with the heat actuator A was not possible, and an alarm was issued. In the manual adjustment in this case, first, the manual operation bolt was turned counterclockwise to widen the extrusion slit gap and adjusted to a predetermined film thickness. When the film thickness measured with the film thickness meter returned to the predetermined thickness, the lockup bolt was turned counterclockwise to lock up the heat bolt. There was no change in film thickness before and after lockup. Thereafter, the film thickness automatic control device was activated to form a film having the same thickness accuracy as the film.

  Like the case 1 and the case 2, in the thermal displacement type T-die of the present invention, not only when adjusting in the pushing direction to reduce the film thickness, but also manually adjusting in the pulling direction to increase the film thickness. In this case, since the position is fixed by lock-up while maintaining the position where manual adjustment by the manual operation bolt is held, manual adjustment of the film thickness can be accurately performed without causing play by the lock-up operation. And it was confirmed that it could be done easily.

The thermal displacement T-die of the present invention is easy to adjust and highly accurate because manual adjustment of the thickness can lock up the backlash. Further, when automated, the initial loss is small and the film can be formed with high thickness accuracy, so that it can be suitably used for film formation.

In the Example of the thermal displacement type T die of this invention, it is sectional drawing of the direction orthogonal to the T die slit in the position of the heat actuator with which the T die main body was mounted | worn. It is sectional drawing which expands and shows the manual adjustment part in FIG. It is a top view of the heat bolt which is components of the heat actuator shown in FIG. FIG. 4 is a front view of FIG. 3. It is a front view showing an example of a manual operation bolt. It is a front view which shows an example of a lockup volt | bolt. It is a top view of the position fixing tool which is a component of the heat actuator shown in FIG. It is sectional drawing in the VIII-VIII line of FIG. It is a top view of the heat actuator fixing plate which attaches the heat actuator shown in FIG. 1 to T-die. It is sectional drawing in the XX line of FIG. It is the elements on larger scale for demonstrating the lockup state of the lockup bolt at the time of adjusting in the direction which pushes a manual operation volt | bolt. It is the elements on larger scale for demonstrating the lockup state of the lockup bolt at the time of adjusting in the direction which pulls a manual operation volt | bolt. FIG. 3 is a cross-sectional view at a heat actuator position in a direction perpendicular to the lip of the T die in FIG. 3 disclosed in US Pat. No. 3,940,221 (Patent Document 1). It is sectional drawing in the heat actuator position of the direction orthogonal to the lip | rip of T-die. It is a perspective view which decomposes | disassembles and shows the attachment state for demonstrating the attachment state to the T-die of a heat actuator. It is principal part explanatory drawing which shows the change of the screwing state of the operation volt | bolt and a nut by operation of the operation volt | bolt and a lockup volt | bolt in the case of performing manual adjustment of the push pressed against a lip when a film is thicker than a predetermined value. It is principal part explanatory drawing which shows the change of the screwing state of the operation volt | bolt and a nut by operation of the operation volt | bolt and lockup volt | bolt in the case of performing manual adjustment which pulls a lip when a film is thinner than predetermined value. It is typical explanatory drawing for demonstrating the state of the movement of the heat block by operation of an operation volt | bolt and a lockup volt | bolt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 T-die main body 11 Extrusion slit 12 Flexible lip A Heat actuator 20 Heat bolt 21 Elastic member 212 Heater 213 Playing tool 22 Manual operation bolt (moving operation means)
221 Large-diameter screw part 222 Small-diameter screw part 23 Lock-up bolt (lock-up means)
231 Screw part 233 Stopper rod 30 Mounting member 31, 32 Fixing bar 33 Fixing plate 34 Gate-shaped mounting base 35 Position fixing tool 351 Female screw hole 352 Counterbore hole 36, 37, 38 Mounting bolt

Claims (7)

  A T-die in which an extrusion slit is formed by a pair of lips, at least one of the lips is a flexible lip, and the extrusion slit gap is adjusted by pushing and pulling a plurality of heat actuators mounted in the width direction of the flexible lip. In a heat displacement T-die that adjusts to form a film or sheet of uniform thickness, the heat actuator can be pushed and pulled with respect to the T-die main body without changing the state adjusted by the movement operation means. A thermal displacement T-die that is mounted so as to be manually adjustable by lock-up means that can be locked up in both directions of pushing and pulling.   2. The thermal displacement T-die according to claim 1, wherein the moving operation means is a manual operation bolt, and the lock-up means is a lock-up bolt.   The thermal displacement T-die according to claim 2, wherein the manual operation bolt is a differential screw.   The lockup bolt is provided with an annular stopper rod or an annular stopper groove for restricting the axial movement of the lockup bolt within a certain range in both directions, and both axial ends of the stopper rod or the stopper groove are arranged in the axial direction. The heat actuator is abutted against a counterbore hole or a fixing pin formed in the fixture for fixing the position of the heat actuator to the T-die body, and the heat actuator is locked up in both directions of pushing and pulling of the lockup bolt. The thermal displacement T-die according to claim 2 or claim 3.   At least one lip of the T-die in which the extrusion slit is formed by a pair of lips is a flexible lip, and the extrusion slit gap is adjusted by adjusting the push and pull of a plurality of heat actuators mounted in the width direction of the flexible lip. A heat actuator adjuster for use in a heat displacement T-die for forming a film or sheet of uniform thickness, wherein the heat actuator is a manually operated bolt capable of being pushed and pulled with respect to the T-die body. And can be manually adjusted by a lockup bolt that can be locked up in both push and pull directions without changing the state adjusted by the manual operation bolt, and the axial direction of the manual operation bolt and the lockup bolt is the axis of the heat actuator. It is almost parallel to the direction and keeps a certain distance from the T-die. A position fixing tool attached to the die and having a space between the T die, the manual operation bolt is screwed to the position fixing tool, and a male screw provided at one end of the manual operation bolt is connected to the position fixing tool. It is screwed into a female screw provided in an idler that can be advanced and retracted in parallel to the axial direction of the heat actuator stored in the space of the fixture, and the other end can be rotated from the outside. In addition to the female screw, the play tool is provided with another female screw parallel to the axial direction of the heat actuator, and the play tool is connected to the heat actuator, and a male screw at one end of the lockup bolt. A screw is screwed into the other female screw of the play tool, and the other end is made to be able to rotate the shaft from the outside, and the axial movement of the lockup bolt is prevented by a stopper rod or a stop. Adjuster for heat actuator is limited in both directions-out push-pull to the deformation range of the flexible lip by chromatography groove.   A T-die in which an extrusion slit is formed by a pair of lips, at least one of the lips is a flexible lip, and the extrusion slit gap is adjusted by pushing and pulling a plurality of heat actuators mounted in the width direction of the flexible lip. 6. A thermal displacement T-die that adjusts to form a film or sheet having a uniform thickness, wherein the heat actuator adjusting tool according to claim 5 is mounted.   In the manufacturing method of the film or sheet | seat by extrusion, it manufactures using the thermal displacement type | mold T-die of any one of Claims 1 thru | or 4, The manufacturing method of the film | membrane or sheet | seat characterized by the above-mentioned.