JP2000052404A - Method and device for extrusion molding utilizing ultrasonic wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for extrusion molding utilizing ultrasonic wave in which such a resin film product can be produced that the same has wide width and precision and free from unevennesses on the surface. SOLUTION: In the method for extrusion molding utilizing ultrasonic wave, an ultrasonic vibration driving fitting part is equipped with an ultrasonic lip part 7 tilted at about 45 degrees for the direction of resin flow. An extrusion die 5 consists of structure in which a horizontal hole ranging over the whole width of the die is provided in the position of about 1/2 wavelength of ultrasonic resonance from an outlet part 8 of resin. Uniform ultrasonic vibration free from a node along the direction of resin flow is given to the whole width of the die in the vicinity of the tip of an outlet of resin in the extrusion die 5 by means of both a plurality of ultrasonic vibrators 2 driven through an adiabatic vibrator such as a joint-debooster 4 and an oscillator 1 for drive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for ultrasonically extruding a resin film for a liquid crystal panel to obtain a product having no irregularities in precision extrusion molding.

[0002]

2. Description of the Related Art Conventional extrusion molding methods and apparatuses utilizing ultrasonic waves are mainly intended to increase the extrusion speed and extend the durable life of an extrusion molding die by using the effects of ultrasonic vibrations. It was difficult to obtain a uniform and node-free vibration distribution in the direction. In particular, it has been almost impossible to stably obtain a uniform and node-free vibration distribution by applying ultrasonic vibration uniformly over a length of 1/3 or more of the wavelength of the longitudinal wave. For this reason, in extrusion molding of a resin film for a liquid crystal panel or the like, since a film has irregularities at nodes of ultrasonic vibration, a precise film cannot be obtained.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a uniform, uniform vibration distribution over a range of several times the length of the wavelength of the longitudinal wave of ultrasonic vibration, and to provide a wide, precise, surface It is an object of the present invention to provide a method and an apparatus for extrusion using ultrasonic waves, which can produce a product having no irregularities.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an extrusion molding method using an extrusion mold having an ultrasonic vibrator and a die lip. This is an extrusion method using ultrasonic waves, which applies various ultrasonic vibrations to the entire mold width. Preferably, the extrusion mold has a die lip set in a range of 15 degrees to 165 degrees with respect to the resin flow direction, and a position of 1/2 wavelength of ultrasonic resonance from a resin outlet portion where ultrasonic vibration is generated. Near, Z
An ultrasonic-assisted extrusion molding method having a lateral hole whose dimension in the direction is the same as the dimension of the mold in the Z direction at the same position, and whose dimension in the X direction is 90% or more of the dimension of the mold in the X direction at the same position. Device. More preferably, there is a joint and / or deboostter between the ultrasonic transducer and the die lip having a length of one or more wavelengths of ultrasonic resonance,
It has a function to block high heat from the mold with respect to the ultrasonic vibrator, and simultaneously oscillates multiple ultrasonic vibrators to give uniform ultrasonic vibration to the mold having the same die lip over the entire mold width. An ultrasonic extrusion method and apparatus having an oscillator having a structure.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention is schematically shown in FIGS. 1 (front view) and 2 (cross sectional view). 1 and 2,
(1) is an oscillator capable of simultaneously oscillating a plurality of ultrasonic transducers. (2) is an ultrasonic vibrator (such as a Lanschurn vibrator) that receives high-frequency power supplied from an oscillator (1) and oscillates ultrasonically. Tell the short (3) adjusted to the length. Further, it is transmitted to the lip part (7), which is a part of the components of the extrusion die (5), via a connector such as a toe-star (4) also adjusted to the length of the wavelength (λ). , Half wavelength
The amplitude is enlarged at the lip part adjusted to the length of (λ / 2),
Finally, a uniform ultrasonic vibration having no nodes is generated over the entire width of the mold along the resin flow direction (9) in the resin flow surface portion of the resin outlet portion (8).

The ultrasonic vibration frequency used in the present invention is desirably 19 kHz or more in consideration of the easiness of outputting the amplitude and the avoidance of the audible region due to the noise environment received by the operator when the apparatus is operated. The acceptable range is preferably between 18 and 40 kHz.

[0007] In the present invention, when the extrusion die has a high heat, the material constituting the connection tool such as a shot, a tape star or the like is compared with iron or an aluminum alloy for the purpose of suppressing the heat transfer from the die.
Titanium materials with relatively low thermal conductivity are preferred. The tough star is a connector having a function of adjusting the magnitude of a target amplitude as well as merely transmitting vibration, and has a function of reducing the amplitude at the exit side with respect to the amplitude at the entrance side.
By appropriately using the tape star, it is easy to obtain the optimum amplitude of the partial vibration of the resin flow surface in accordance with the characteristics of the resin to be produced.

The horizontal hole (6) in the present invention is provided in the entire width of the mold near a position at a half wavelength of the ultrasonic resonance from the resin outlet portion, and at the same time as blocking the vibration at the lip portion (7), It has an antinode (free end) function of reflecting vibration. The dimensions of the side holes are easy to process, mold strength,
Considering the effects of the ultrasonic vibration blocking function, the width in the Y direction is 0.1 mm or more and 10 mm or less, the dimension in the Z direction is the same as the dimension in the Z direction at the same position, and the dimension in the X direction is It is desirable that it is 90% or more of the dimension of the die in the X direction at the same position.

The angle at which the ultrasonic vibrator is set with respect to the flow direction of the resin is in the range of 15 to 165 degrees. From the viewpoint of practicality, the angle is preferably in the range of 30 to 90 degrees, and more preferably about 45 degrees.

In order to apply a uniform ultrasonic vibration having no nodes along the resin flow direction near the resin outlet of the extrusion mold to the entire mold width, as shown in FIG. It is necessary to appropriately arrange a plurality of necessary ultrasonic transducers according to the size.

FIG. 3 (cross-sectional view) shows the relationship between the amplitude and the wavelength of the ultrasonic transducer in the present invention. The uniform ultrasonic vibration having no nodes along the resin flow direction in the present invention refers to vibration having no nodes over the entire width of the mold as shown in (11) of FIG. 4 (front view). Say. For reference, an example of a knotted vibration obtained by the conventional technique is shown in (12).

[0012]

[Embodiment] {Example 1} Wheeler using the apparatus of the present invention
Using a film made of tersulfone resin with a thickness of about 300 μm and a width of about 400 mm, ultrasonic oscillation frequency of about 20 kHz, ultrasonic vibration amplitude 0
Extrusion molding was performed by changing the thickness in the range of ~ 6 µm, and a comparative experiment was conducted with the case where no ultrasonic wave was applied. As shown in Fig. 5, when the ultrasonic amplitude was increased, no ultrasonic vibration was applied. As compared with the case of (1), a significant decrease in fine irregularities on the film surface was observed.

[0013]

According to the extrusion molding die and apparatus utilizing ultrasonic waves of the present invention, uniform ultrasonic vibrations without nodes along the resin flow direction can be applied to the entire width of the molding die. Fine irregularities (appearing as unnecessary stripes) generated near the exit can be eliminated. Furthermore, foreign matter due to thermal degradation of the resin, which tends to occur after the start of extrusion molding, is prevented from adhering to the tip of the lip, which is the resin outlet. Enables continuous operation.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an extrusion mold and apparatus using ultrasonic waves according to the present invention.

FIG. 2 is a schematic cross-sectional view of an extrusion mold and apparatus using ultrasonic waves according to the present invention.

FIG. 3 is a diagram showing the relationship between the amplitude and the wavelength of the ultrasonic vibration amplitude according to the present invention.

FIG. 4 is an explanatory view of a uniform ultrasonic vibration having no nodes at a resin outlet portion of the present invention.

FIG. 5 shows an example of the reduction of fine irregularities on the film surface when ultrasonic vibration of the present invention is applied.

[Explanation of symbols]

 1: Oscillator 2: Oscillator 3: Short 4: Tough Star 5: Extrusion Die 6: Side Hole 7: Rip 8: Resin Outlet 9: Resin Flow Direction 10: Mold Fixing Section 11: Uniform without nodes Vibration distribution 12: Example of vibration distribution with nodes <broken line>

Claims (9)

[Claims] In an extrusion molding using an extrusion mold having an ultrasonic vibrator and a die lip, a uniform ultrasonic vibration having no nodes along a resin flow direction is provided near a resin outlet of the extrusion mold. An extrusion method using ultrasonic waves, which is applied to the whole. 2. The extrusion molding die has a width of 1 to the resin flow direction.
The method of claim 1, wherein the die has a die lip set in a range of 5 degrees to 165 degrees. 3. An extrusion molding die is positioned near a position of a half wavelength of ultrasonic resonance from a resin outlet where ultrasonic vibration is generated.
The dimension in the Z direction is the same as the dimension of the die in the Z direction at the same position, and the dimension in the X direction has a side hole having a size of 90% or more of the dimension of the die in the X direction at the same position. Extrusion molding method using ultrasonic waves. 4. A joint and / or a booster having a length of one or more wavelengths of ultrasonic resonance between the ultrasonic vibrator and the die lip, and a high heat generated from a mold with respect to the ultrasonic vibrator. 4. The extrusion molding method using ultrasonic waves according to claim 1, which has a function of shutting off. 5. The ultrasonic wave according to claim 1, further comprising an oscillator having a structure in which a plurality of ultrasonic vibrators are simultaneously oscillated to apply uniform ultrasonic vibration to a mold having the same die lip over the entire width of the mold. Use extrusion molding method. 6. An extrusion apparatus comprising an ultrasonic vibrator and an extrusion mold having a die lip, wherein the extrusion mold has a die lip set in a range of 15 to 165 degrees with respect to a resin flow direction. An extrusion molding device characterized by the above-mentioned. 7. An extruding mold is positioned near a position of 1/2 wavelength of ultrasonic resonance from a resin outlet where ultrasonic vibration is generated.
The extrusion according to claim 6, wherein the dimension in the Z direction is the same as the dimension of the mold in the Z direction at the same position, and the dimension in the X direction has a side hole having a size of 90% or more of the dimension of the mold in the X direction at the same position. Molding equipment. 8. An ultrasonic resonator having a joint and / or debooster having a length of one or more wavelengths of ultrasonic resonance between the ultrasonic vibrator and the die lip, and having a high heat from a mold for the ultrasonic vibrator. 8. The extrusion molding apparatus according to claim 6, which has a function of shutting off. 9. The extrusion molding according to claim 6, further comprising an oscillator configured to simultaneously oscillate a plurality of ultrasonic transducers and apply uniform ultrasonic vibration to a mold having the same die lip over the entire width of the mold. apparatus.