JPH09314636A - Extrusion molding die and manufacture of sheet or film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the uniform adjustment of a large opening range in a short period of time and the settlement of the uneven thickness of a product by a method wherein the opening of a die is adjusted by moving a block tapered in the which direction of the die to the width direction of the die. SOLUTION: The die lip opening is formed by the die lips 3 and 4 of die main bodies 1 and 2. In the die lip 4, a groove, the bottom part of which is broader than its opening part, is formed to the width direction of a die. At the same time, in a die side plate opposing to the die lip 4, a groove, the bottom part of which is broader than its opening, is formed to the width direction of the die. The shapes of these grooves may well be equal to the shapes engaging with the shapes of both the end parts of a tapered block 7. In addition, the gap of the groove is made to become gradually narrower from one end to the other end of the die. Concretely, the same taper as that of the tapered block 7 is formed in the groove. The order of the taper is determined through the adjustment of the amount of movement of the block 7 and the degree of the change of the opening of the die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion molding die and a method for manufacturing a sheet or film using the same, and more specifically, it is possible to drastically change the lip opening and to manufacture a plurality of brands. The present invention relates to a molding die and a method for producing a sheet or film using the molding die.

[0002]

2. Description of the Related Art Conventionally, a flat die for extruding a sheet or a film must be replaced with a die set to an appropriate die opening each time the thickness of the sheet or the film is largely changed by changing the brand. This was a major factor in reducing productivity due to the suspension of production equipment.

In recent years, a die capable of setting a large opening range with one die has been proposed (JP-A-7-205254).
No., JP-A-7-227897).

[0004]

[Patent Document 1] Japanese Patent Application Laid-Open No. 7-205254, in which a large opening range can be adjusted with one die.
The die disclosed in Japanese Patent Publication has a manual adjustment bolt for making a large adjustment of the lip opening on one lip block, and a heat bolt for eliminating unevenness in product thickness on the other lip block. When adjusting a large opening with the manual adjustment bolt, if one adjustment bolt is adjusted to a large degree, stress concentration will occur and plastic deformation will occur on the lip, so install the manual adjustment bolt gradually and in order. There is a problem in that it is necessary to adjust the predetermined lip opening, and it takes time to set the predetermined opening.

Further, Japanese Patent Laid-Open No. 7-227897 proposes a method of adjusting a large lip opening at a time in the width direction of the die, but it has a complicated structure in which a plurality of blocks are combined. are doing.

The present invention solves the above-mentioned conventional problems, and
One die has an opening adjustment means having a simple structure capable of uniformly adjusting a large opening range in a short time, and further has a means for eliminating unevenness in product thickness. The purpose is to provide a manufacturing method.

[0007]

The object of the present invention is, according to the present invention, a flat die for extruding a sheet or film, wherein the lip opening of the die is made uniform in the width direction. As a means for adjusting, a groove having a bottom portion wider than the opening portion is formed in the die width direction on one lip block, and a groove having a bottom portion wider than the opening portion is formed in the die width direction on the die side plate facing the lip block, And one end has a shape that engages with the groove of the lip block,
A block having a shape in which the other end is engaged with the groove of the die side plate and tapered in the die width direction is provided by engaging both ends of the block with the groove, and the block is moved in the die width direction. This is achieved by an extrusion molding die characterized in that the opening of the die is adjusted.

The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an extrusion molding die showing one embodiment of the present invention, and FIG. 2 is a view taken along the line aa of FIG. FIG. 3 is a cross-sectional view of an extrusion molding die in which the manual heater adjusting bolt for adjusting the thickness variation of the die shown in FIG. 1 is replaced with a cartridge heater, and FIG. 4 is a plurality of die main bodies 2 along the width direction of the die. It is an extrusion molding die in which the installed cartridge heater and the tapered block for adjusting the lip opening degree are installed at the same time. FIG. 5 is a bird's-eye view of the tapered block. FIG. 6 is a sectional view showing an example of a conventional extrusion molding die.

In the drawing, 1 and 2 are die bodies, 3 and 4 are die lips, 5 is a die lip opening, 6 is an adjusting bolt for adjusting thickness unevenness, and 7 is a large opening for uniformly changing the lip opening 5 in a short time. Block (tapered block), 8
Is a cartridge heater, 9 and 10 are die side plates, 11 is a coupling, and 12 is a cylinder.

In FIGS. 1 and 2, the die lips are formed by the die lips 3 and 4 of the die bodies 1 and 2. A groove whose bottom is wider than the opening is formed in the die lip 4 in the die width direction, and a groove whose bottom is wider than the opening is formed in the die side plate 9 facing the die lip 4. The shape of these grooves is tapered block 7
There is no particular limitation as long as it is a shape that occludes the shape of both ends of the, but usually takes a cross-sectional shape as shown in FIG. The distance between these grooves is gradually reduced from one side of the die to the other side. Specifically, the same taper as that of the tapered block 7 is formed.

The taper-shaped block 7 has a shape in which one end of the taper block 7 meshes with the groove of the lip block 4, and the other end has a shape of meshing with the groove of the die side plate 9 in the die width direction. It has a taper. The tapered block 7 may have a shape as shown in FIG. 5, for example. The degree of taper may be determined by adjusting the moving amount of the block and the degree of change of the die opening. For example, as shown in FIG. 2, the length in the width direction is 1.5 m.
When a block 7 having a length of 1.5 m and a taper of 30 mm is provided in the die 2 of FIG.
Can be narrowed by 1 mm, while the die lip opening 5 can be widened by 1 mm when pulled out by 50 mm. Pushing and pulling of the block 7 can be performed by a manual or motor drive type adjusting bolt, or a hydraulic or electric actuator.

As shown in FIG. 1, the extrusion molding die of the present invention is preferably provided with a plurality of sheet or film thickness unevenness adjusting means in the die width direction. As the thickness unevenness adjusting means, a conventionally known one can be used. For example, manual or motor drive type adjusting bolts, piezo actuators, heat bolts, hydraulic or electric actuators that partially adjust the die lip opening, cartridge heaters such as adjusting the polymer temperature of the lip land. Examples thereof include those that partially finely adjust the polymer flow rate. As this means, a manual adjustment bolt is shown in FIG. 1, and a cartridge heater is shown in FIG.

The cartridge heater 8 can also be provided on the die lip 4 to which a tapered block is attached, as shown in FIG. In this case, after the lip opening 5 is greatly adjusted by the tapered block 7, the polymer temperature is raised or lowered by the cartridge heater 8 to make the thickness of the sheet or film uniform in the width direction.

The object of the invention is, according to the invention, a second
In the case of manufacturing a sheet or film using the extrusion molding die described above, the lip opening is adjusted by moving the tapered block to a predetermined opening in the die width direction, preferably after that, the width direction of the sheet or film is adjusted. The thickness unevenness of the sheet is adjusted by using a thickness unevenness adjusting means. By the operation of the tapered block and the subsequent operation of the thickness unevenness adjusting means, it is possible to switch sheets or films having a large difference in thickness and a uniform thickness in the width direction on the order of several hours.

The polymer forming the sheet or film is not particularly limited as long as it is a thermoplastic polymer having sheet or film type performance, but aromatic polyester, polyamide, polyolefin, polycarbonate, polyetherketone and the like can be preferably exemplified. . Of these, aromatic polyesters, particularly polyethylene terephthalate and polyethylene-2,6-naphthalate are preferred.

[0016]

EXAMPLES The present invention will be further described below with reference to examples.

[Example 1] When polyethylene-2,6-naphthalate was melt extruded using an extrusion molding die having a width of 1.5 m shown in FIG. It was possible to manufacture a uniform film having a thickness of 250 μm by measuring the thickness unevenness in the width direction of the film product after stretching with a radiation thickness gauge and adjusting the thickness unevenness with an adjusting bolt installed in the width direction of the die. . After that, with the same die, taper block 50mm using electric actuator
As a result of inserting and setting the lip opening to 1 mm and adjusting the thickness unevenness with the adjusting bolt, it was possible to switch over and produce a uniform film having a thickness of 10 μm on the order of several hours.

[Embodiment 2] An extruding die having only the means for adjusting the thickness unevenness of a conventionally used product shown in FIG. 6 is used, and one lip block has a large lip opening as shown in FIG. And a plurality of heating devices are simultaneously installed along the width direction of the die lip to adjust the thickness unevenness. I went the same way. Films having greatly different thicknesses as shown in Example 1 could be switched and produced in the order of several hours. Further, since the manufacturing cost for only one side of the die is sufficient, a large cost reduction can be implemented.

[0019]

EFFECTS OF THE INVENTION By the extrusion molding die of the present invention and the sheet or film manufacturing method using the same, compared with the conventional die, the lip opening can be made uniform in the die width direction and at any desired lip opening in a short time. Can be adjusted,
Further, by providing a means for adjusting the unevenness of the product thickness on the lip side or the other side having the lip opening adjusting means, a sheet or film having a large difference in thickness in an extremely short time and excellent in thickness uniformity can be obtained. Since it can be manufactured with one die, it can greatly contribute to productivity improvement.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an extrusion molding die of the present invention.

FIG. 2 is a view on arrow aa of FIG.

FIG. 3 is a sectional view showing an example of an extrusion molding die of the present invention.

FIG. 4 is a sectional view showing an example of an extrusion molding die of the present invention.

FIG. 5 is a bird's-eye view of a tapered block.

FIG. 6 is a sectional view showing an example of a conventional extrusion molding die.

[Explanation of symbols]

 1, 2: die main body 3,4: die lip 5: die lip opening 6: manual adjustment bolt 7: tapered block 8: cartridge heater 9, 10: die side plate 11: coupling 12: cylinder

Claims (7)

[Claims] 1. A flat die for extruding a sheet or film, wherein one lip block has a groove having a bottom portion wider than the opening portion as means for uniformly adjusting the lip opening of the die. Forming in the direction,
Further, a groove having a bottom portion wider than the opening portion is formed in the die side plate facing the lip block in the die width direction, and one end portion has a shape to engage with the groove of the lip block, and the other end portion has the shape described above. A block having a shape that engages with the groove of the die side plate and tapered in the die width direction is provided by engaging both ends of the block with the groove, respectively, and moving the block in the die width direction to open the die opening. The extrusion die is characterized in that it is adjusted. 2. The extrusion molding die according to claim 1, wherein a plurality of sheet or film thickness unevenness adjusting means are provided in the die width direction on the other lip block of the flat die. 3. The extrusion molding die according to claim 2, wherein the thickness variation adjusting means is a manual adjustment bolt for finely adjusting the die opening. 4. The extrusion molding die according to claim 2, wherein the thickness unevenness adjusting means is a heating means for finely adjusting the temperature of the molten polymer in the lip land. 5. The flat die according to claim 1, wherein one of the lip blocks of the flat die is provided with a plurality of means for adjusting the thickness variation of the sheet or the film in the die width direction together with a means for uniformly adjusting the lip opening degree in the width direction. Extrusion molding die. 6. When manufacturing a sheet or film using the extrusion molding die according to claim 1, the lip opening is adjusted to a predetermined opening by moving the block in the die width direction. Sheet or film manufacturing method. 7. The lip opening is adjusted to a predetermined opening by moving the block in the die width direction, and the thickness unevenness in the width direction of the sheet or film is adjusted by the thickness unevenness adjusting means. Item 7. A method for producing a sheet or film according to item 6.