JPH0531930U - Extrusion T-die - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an extrusion molding T-die, and in particular,
It is characterized in that the thickness of the neck portion of the movable lip is gradually reduced from the center portion in the longitudinal direction to each end portion, so that the thickness of the molded product is made uniform. [Structure] In the T-die for delivery molding according to the present invention, the wall thickness (T) of the neck portion (3A) of the movable lip (3) is measured from the central portion (Ab) side in the longitudinal direction (A) to each end portion (Aa). ) Side, the thickness is gradually reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an extrusion molding T-die, and in particular, the thickness of the neck portion of the movable lip is gradually reduced from the center portion in the longitudinal direction to each end portion thereof, and the thickness of the molded product in the width direction is reduced. It relates to a new improvement for homogenization.

[0002]

[Prior Art]

 There are various types of T-die for extrusion molding which have been conventionally used, and a typical one of them will be described. For example, the structure disclosed in Japanese Patent Publication No. 2-60505 shown in FIG. And the structure disclosed in Japanese Patent Publication No. 62-43849 shown in FIG. That is, in the case of the configuration shown in FIG. 5, a slit-shaped lip port 4 having a distance D in the direction orthogonal to the longitudinal direction A is formed between the fixed lip 2 and the movable lip 3 of the T die 1, and this movable lip 3 has A plurality of U-shaped grooves 5 and protrusions 6 are formed along the longitudinal direction A at predetermined intervals.

The tongue piece 1 a of the T die 1 is rotatably provided with a plurality of die bolts 7 a to 7 e corresponding to the protrusions 6, and the tips of the die bolts 7 a to 7 e are attached to the protrusions 6. Abutting. Therefore, by tightening the die bolts 7a to 7e on the side of the end portion Aa in the longitudinal direction A of the lip opening 4 to bend the neck portion 3A of the movable lip 3, the gap D of the lip opening 4 is set to the central portion in the longitudinal direction A. The thickness was adjusted to be narrower than Ab, and the thickness of the formed sheet was formed to be uniform in the longitudinal direction.

Further, in the case of the structure shown in FIG. 6, since the structure is almost the same as that of FIG. 5, the same parts are denoted by the same reference numerals and the description thereof will be omitted. The depth L of each groove 5 is formed so as to become deeper sequentially from the center portion Ab in the longitudinal direction A to the end portion Aa side, and the gap D of the lip mouth 4 on the end portion Aa side is set from the center portion Ab side. Was adjusted to be narrower.

[0005]

[Problems to be solved by the device]

 Since the conventional T-die for extrusion molding is configured as described above, there are the following problems. That is, in the case of the conventional configurations of FIGS. 5 and 6, since the thickness of the neck portion for forming the movable lip is the same along the longitudinal direction A in both cases, a plurality of grooves are formed. Nevertheless, the movable lip was not bent enough, and it was extremely difficult to make the thickness of the formed sheet uniform. Further, in the case of the configuration shown in FIG. 6, the depth of each groove must be changed, which makes it difficult to control in processing, which is a great obstacle in manufacturing the T-die.

The present invention has been made to solve the above problems, and in particular, the thickness of the neck portion of the movable lip is sequentially increased from the center side in the longitudinal direction to each end side. It is an object of the present invention to provide a T-die for extrusion molding which is made thin and has a uniform thickness in the width direction of a molded product.

[0007]

[Means for Solving the Problems]

 In the extrusion molding T-die according to the present invention, the neck portion of the movable lip is bent by a plurality of die bolts arranged along the longitudinal direction of the lip opening formed between the fixed lip and the movable lip. In the extrusion-molding T die in which the gap between the mouths is adjusted, the thickness of the neck portion is gradually reduced from the center side in the longitudinal direction to each end side.

More specifically, the neck portion has a plurality of grooves formed in a direction orthogonal to the longitudinal direction, each groove is located between the die bolts, and each end side The first spacing between the die bolts located at is smaller than the second spacing between the die bolts on the central portion side.

[0009]

[Action]

 In the T-die for extrusion molding according to the present invention, since the thickness of the neck portion of the movable lip is configured to be gradually reduced from the center side in the longitudinal direction to each end side, among the die bolts, By tightening the die bolt on the end side, the neck part on the end side is bent, and the first gap on the end side of the lip mouth becomes narrower than the second gap on the other center side, The lip opening can be adjusted very easily.

[0010]

【Example】

 Hereinafter, preferred embodiments of the T-die for extrusion molding according to the present invention will be described in detail with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example will be described with the same reference numerals. 1 to 4 are for showing a T-die for extrusion molding according to the present invention, FIG. 1 is a front view with a part omitted, FIG. 2 is a bottom view from the arrow A of FIG. 1, and FIG. 1 is a sectional view taken along the line BB, and FIG. 4 is a sectional view taken along the line CC of FIG.

In the figure, reference numeral 1 is a T-die connected to an extruder (not shown), and a resin passage 20 formed in the T-die 1 for guiding molten resin from the extruder is , A fixed lip 2 and a movable lip 3 which communicate with a lip opening 4 having a distance D.

The movable lip 3 is formed integrally with the T-die 1 via a thin neck portion 3A, and a plurality of die bolts 7a screwed to the tongue piece 1a of the T-die 1. The tips of ~ 7e are in contact with the movable lip 3.

As shown in FIG. 2, the movable lip 3 has a plurality of protrusions 6 formed by a plurality of grooves 5 formed in a direction orthogonal to the longitudinal direction A of the lip port 4. The tips of the die bolts 7a to 7e are in contact with the protrusions 6 while being pressed, and the grooves 5 are located between the protrusions 6 and between the die bolts 7a to 7e. There is.

As shown in FIGS. 1 and 4, the neck portion 3A has a wall thickness T which is gradually reduced from the central portion Ab side in the longitudinal direction A of the lip opening 4 to the respective end portions Aa, Aa. (Change linearly), the first thickness T ₁ located on the end Aa side and the second thickness T ₂ located on the central part Ab have a relationship of T ₁ <T ₂ . Is configured.

Further, among the die bolts 7a to 7e, the first intervals P ₁ and P ₂ of the die bolts 7a to 7c located on the end portion Aa side are equal to those of the die bolts 7c to 7e on the central portion Ab side. It is configured to be smaller than the second intervals P ₃ and P ₄ between them, and has the relationship of P ₁ = P ₂ , P ₃ = P ₄ , and P ₁ <P ₃ , and as an example, P ₁ and P ₂ is composed of 70% of P ₃ and P ₄ , respectively. Therefore, the bending of the neck portion 3A of the movable lip 3 corresponding to the die bolts 7a, 7b on the side of each end portion Aa is configured to be bent more easily than other portions.

Next, in the above-mentioned configuration, when the movable lip 3 is actually pressed by the die bolts 7a to 7e to adjust the distance between the lip openings 4, first, the die bolts 7a on the respective end portions Aa side described above are first adjusted. , 7b are bent (pushed in) slightly, the neck portion 3A on the end portion Aa side is slightly bent, and the gap between the lip openings 4 can be made narrower than that on the other center portion Ab side. Therefore, by extruding the molten resin from the lip port 4 in the adjusted state to obtain a molded sheet, the thickness of the molded sheet in the longitudinal direction A of the lip port 4 can be made substantially uniform. Actually, the above-mentioned adjustment work is not completed in one time, but after various adjustments, the adjustment can be completed through several push-out operations.

[0017]

[Effect of the device]

 Since the T-die for extrusion molding according to the present invention is configured as described above, the following effects can be obtained. That is, since the thickness of the neck portion of the movable lip is gradually reduced from the center side to each end side, it is extremely easy to adjust the movable lip, and a uniform thickness is formed over the entire longitudinal direction of the lip mouth. A sheet can be obtained and the yield can be significantly improved.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing a T-die for extrusion molding according to the present invention.

FIG. 2 is a bottom view taken in the direction of arrow A in FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a perspective view of a main part showing a conventional T die.

FIG. 6 is a perspective view of a main part showing a conventional T die.

[Explanation of symbols]

2 Fixed lip 3 Movable lip 3A Neck part A Longitudinal direction 4 Lip mouth Aa End part Ab Central part 5 Grooves 7a-7e Die bolts P ₁ , P ₂ 1st interval P ₄ 2nd interval

Claims (2)

[Scope of utility model registration request] 1. The movable lip by a plurality of die bolts (7a-7e) arranged along a longitudinal direction (A) of a lip opening (4) formed between a fixed lip (2) and a movable lip (3). In an extrusion molding T-die in which the neck portion (3A) of (3) is bent to adjust the interval between the lip openings (4), the neck portion (3
An extrusion molding T-die, characterized in that the thickness (T) of (A) is gradually reduced from the central portion (Ab) side in the longitudinal direction (A) to each end portion (Aa) side. 2. The neck portion (3A) is provided with the longitudinal direction.
(A) has a plurality of grooves (5) formed in a direction orthogonal to each other, each groove (5) is located between the die bolts (7a ~ 7e), and each end (Aa) side Located on each die bolt (7a-7
The first interval (P _{1 to} P ₂ ) between c) is smaller than the second interval (P ₄ ) between the die bolts (7d to 7e) on the central portion (Ab) side. The T-die for extrusion molding according to claim 1, which is characterized in that.