JPH04137822U - T die lip structure - Google Patents

Abstract

(57) [Summary] [Objective] The present invention relates to a T-die lip structure, and is particularly characterized in that by reinforcing the flexible lip, the gap between the lips is prevented from varying during resin extrusion. [Structure] The T-die lip structure according to the present invention is
Flexible lip provided on (3) and forming lip (2)
In the T-die lip structure in which the interval between the lips (2) is made variable by pressing the flexible lip (7) with the pressing body (9), the flexible lip (7) is provided with the pressing body (9). A holding body (21) having a guide hole (20) through which the movable rod (10) passes, and a mounting screw (24) for attaching the holding body (21) to the flexible lip (7),
The structure is such that the flexible lip (7) is reinforced by the holder (21).

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a T-die lip structure, and particularly to reinforcing a flexible lip. A new technology has been developed to prevent lip spacing from changing during resin extrusion. regarding regular improvements.

0002

[Conventional technology]

There are various types of this type of T-die lip structure that have been used in the past, but here are some alternatives. To describe a typical example, it is disclosed in Japanese Patent Application Laid-Open No. 60-210418 shown in Figure 3. Mention may be made of the configurations shown. In other words, in FIG. 3, molten resin enters from inlet 1 and is pushed through the gap between lip 2. It is configured to be issued. The symbol 3 is the die body, which is equipped with heaters 4, 5, and 5 to keep the temperature constant. 6, and one side of the lip 2 of this die body 3 is provided with a flexible material having low rigidity. A bull lip 7 is formed. The flexible lip 7 is provided in the side portion 3a of the die body 3 by loosely fitting into the hole 8. The piezoelectric element 9 is configured to be pressed by a push rod 10 of the piezoelectric element 9. The gap between the lips 2 is adjusted by pressing. The upper surface of the piezoelectric element 9 is screwed onto the die body 3 via a washer 11. It is held down with bolt 12. Therefore, by tightening the bolts 12, an initial load is applied to the plurality of piezoelectric elements 9. After this initial load is set, apply a voltage of, for example, 200V. By doing so, it is possible to obtain an elongation of approximately 400μ, and press the flexible lip 7. The distance between the lips 2 can be adjusted by adjusting the distance between the lips 2.

0003

[Problem that the idea aims to solve]

Since the conventional T-die lip structure was configured as described above, it had the following issues. There was a problem. In other words, the flexible lip is pressed by a piezoelectric element and the gap between the lips is adjusted. This flexible lip has a thinner hinge area. It is better to adjust the lip spacing if the lip spacing is After adjusting the level, when extruding the resin, the pressure of the resin creates a flexible lip. The thickness of the extruded film may increase due to variations in the lip spacing. There was a serious problem that the thickness became thicker than specified.

0004 This invention was made to solve the above problems, and in particular, By reinforcing the cible lip, the lip spacing during resin extrusion can be prevented from changing. It is an object of the present invention to provide a T-die lip structure that prevents this from occurring.

[0005]

[Means to solve the problem]

The T-die lip structure according to the present invention is a flexible material that is provided on the die body and forms the lip. By pressing the flexible lip with a pressing body, the interval between the lips can be varied. In the T-die lip structure, the flexible lip is provided with a a holder having a guide hole through which the movable rod of the pressing body passes; a mounting screw for mounting on the flexible lip; This structure is such that the flexible lip is reinforced.

[0006]

[Effect]

In the T-die lip structure according to the present invention, the movable rod of the pressing body is passed through. A holder with a guide hole is provided on the flexible lip via a mounting screw. Therefore, when adjusting the lip spacing, the movable rod must be aligned with the contact surface of the flexible lip. You can adjust the spacing by pressing . In addition, when extruding resin after adjusting the lip spacing, this holder is flexible. Because it is provided on the lip, when force F acts in the direction of the arrow in Figure 1, Even if the flexible lip is opened, the holder prevents the flexible lip from opening and always keeps the It is possible to maintain the drop spacing.

[0007]

【Example】

Below, details of preferred embodiments of the T-die lip structure according to the present invention are explained along with the drawings. Explain. Note that the same or equivalent parts as in the conventional example will be described with the same reference numerals. 1 and 2 are for showing the T-die lip structure according to the present invention, and FIG. 1 is a cross-sectional view. 2 is a right side view of FIG. 1 in a reduced size.

[0008] What is indicated by the reference numeral 3 in the figure is the die body, and the parts formed on this die body 3 are A flexible lip with low rigidity having a hinge portion 7a is attached to one side of the lip 2. 7 is formed.

[0009] On the back surface 7b of the flexible lip 7, as shown in FIG. bodies 9 are arranged in parallel in the longitudinal direction at predetermined intervals, and this pressing body 9 includes a plurality of piezoelectric elements. Although this configuration is a stacked structure, other means may also be used.

0010 A movable rod of the pressing body 9 is located at the position of the hinge portion 7a on the back surface 7b. A longitudinal holding body 21 having a guide hole 20 passing through the door 10 is provided. The side bottom surface 21a of the holding body 21 abuts on the hinge portion 7a, and the bottom surface 21a b is in contact with the contact surface 7c of the flexible lip 7.

[0011] The tip 10a of the movable rod 10 contacts the contact surface 7c and The rear end 10b is connected to the pressing body 9 and supports the pressing body 9. A compression spring 23 is provided between the bottom plates 22a of the case 22.

0012 As shown in FIG. 2, the holding body 21 has a plurality of mounting holes provided at predetermined intervals. It is fixed to the flexible lip 7 by means of screws 24.

[0013] In the above configuration, the initial value of the gap between the lips 2 is regulated by the holder 21. Therefore, even if molten resin pressure is applied at the start of operation, the gap between lips 2 will not exceed the initial value. It doesn't open upwards. Then, by further applying an arbitrary voltage to the pressing body 9, the movable rod 10 is The contact surface 7c of the flexible lip 7 is pressed, and the gap between the lips 2 is adjusted to the desired value. Adjusted to the desired size.

[0014] Therefore, the thickness of the film extruded from lip 2 can be measured by a thickness detection means (not shown). The voltage applied to the pressing body 9 is adjusted based on the detection signal. The distance between the lips 2 is adjusted to a desired dimension. As explained above, according to this embodiment, the holding body 21 allows the gap between the lips 2 to be The gap no longer opens beyond the initial value even when molten resin pressure is applied. Sara The pressing stroke of the pressing body 9 can also be adjusted by using a pressing body with a minute stroke. This makes it possible to make the device more compact.

[0015]

[Effect of the idea]

Since the T-die lip structure according to the present invention is configured as described above, it has the following features. You can get a great effect. In other words, the holder having the guide hole through which the movable rod of the pressing body passes is flexible. Because it is attached to the bull lip via a mounting screw, the resin is extruded through the lip. To reliably prevent the flexible lip from expanding due to stress when This allows you to always maintain the set lip spacing and extrude a film of constant thickness. I can do that.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing a T-die lip structure according to the present invention.

FIG. 2 is a reduced side view of the state seen from the right side of FIG. 1;

FIG. 3 is a sectional view showing a conventional T-die lip structure.

[Explanation of symbols]

2 lip 3 Die body 7 Flexible lip 9 Pressing body 10 Movable rod 20 Guide hole 21 Holding body

Claims (2)

[Scope of utility model registration request] Claim 1: By pressing a flexible lip (7) provided on the die body (3) and forming the lip (2) with a pressing body (9), the interval between the lips (2) can be made variable. In the T-die lip structure, a holder (21) having a guide hole (20) provided in the flexible lip (7) and through which the movable rod (10) of the pressing body (9) passes;
(21) to the flexible lip (7); and a T-die lip configured to reinforce the flexible lip (7) with the holder (21). structure. 2. The T-die lip structure according to claim 1, wherein the pressing body is made of a piezoelectric element.