JPH10166421A - T-die with deckle - Google Patents

Abstract

(57) [Problem] To prevent the leakage of resin from both ends of a T-die with a deckle. SOLUTION: A pair of left and right seal metal boxes 20 each having a through hole 21 for inserting a deckle 7 are respectively supported outside a side plate 6 respectively supported on both end sides of a die body. The seal metal 30 that covers the periphery of the deckle 7 as the deckle 7 is inserted is detachably supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T-die with a deckle (hereinafter abbreviated as T-die) connected to the lower end of an extruder for extruding a sheet-like article.

[0002]

2. Description of the Related Art For example, in an extruder for extruding a sheet-like article such as a film, a T-die is connected to a lower end, and a molten resin is extruded through the T-die to obtain a uniform width and a uniform width. A flat molded product having a thickness is obtained. FIGS. 7 to 9 show examples of the structure of the T-die.
7 and 8 are a front view and a sectional view of the T-die, respectively, and FIG. 9 is an enlarged sectional view of the end of the T-die.

In the figure, reference numeral 1 denotes a die body,
Comprises a pair of front and rear members extending in the width direction of the sheet-like article, and a space called a resin flow path 2 is formed between these members. As shown in FIG. 8, the resin flow channel 2 hangs in parallel from the upper manifold portion 2 a having a substantially circular cross section as viewed from the end face so that the thickness in the front-rear direction is the same from the upper manifold portion 2 a, And a slit-shaped land portion 2b opening at the lower end of the die body 1. A resin inlet 3 communicating with the resin flow path 2 is formed above the resin flow path 2.

Reference numeral 4 denotes a pair of front and rear lips which respectively project from the lower end of the die body 1 toward the center in the thickness direction of the land 2b.
, A slit-shaped space (lip land) 5 is formed at predetermined intervals in the front-rear direction. Here, the lower portion of the die body 1 is formed in a wedge shape forming a predetermined angle downward, and the lip portion 4 is formed on the sliding surface 4a along the wall surface 1a of the lower portion of the die body 1 having the wedge shape. Supported slidably up and down. As a result, individual wall surfaces 1a
The vertical movement of the lip portion 4 along the vertical axis allows the distance between the lip lands 5 in the front-rear direction (ie, the thickness of the molded product) to be adjusted. Further, a portion of the lip portion 4 that forms the lip land 5 is a hanging surface 4b that hangs down in parallel with the land portion 2b.

[0005] Reference numeral 6 denotes a pair of left and right side plates for closing both ends of the die body 1 and the lip portion 4. Each is slidably inserted along the direction. The deckle 7 has a through hole 6 formed in the side plate 6 while having substantially the same cross section as the resin flow path 2.
a to extend to both end sides of the die body 1 respectively,
As shown in FIG. 7, it protrudes left and right from both ends of the die body 1.

[0009] As shown in FIG. 9, openings 8 having a predetermined depth are formed at both ends of the T-die along the longitudinal direction of the deckle 7 at the upper end of the deckle 7. , Sliding screws 9 are inserted from both ends of the T-die. These sliding screws 9
Are penetrated through the Dickel fixing plate 10 that respectively supports the Dickel 7 from the base end side, and are screwed to a moving nut 11 provided outside the Dickel fixing plate 10. The rotation of the moving nut 11 allows the deckle 7 to slide in the resin flow path 2. On the other hand, reference numeral 12 denotes the deckle fixing plate 1 via a bearing 13.
0 is a support rod that movably supports 0 along the longitudinal direction of the deckle 7.

In manufacturing a molded product, the molten resin is supplied from the resin injection port 3 into the resin flow path 2 by the extruder and extruded from the lip land 5, and as a result, the distance between the lip land 5 in the front-rear direction is increased. A sheet-like molded product having a uniform thickness according to the above and a uniform width according to the distance between the tips of the pair of deckles 7 is formed. Furthermore, by changing the width of the lip land 5 and the distance between the tips of the pair of deckles 7 as needed, molded articles having different thicknesses and widths can be obtained using the same die body 1.

[0008]

By the way, in the case of the above-mentioned conventional T-die, the deckle 7 is inserted into the through hole 6a through a gap having a predetermined width, and the molten metal flows from the die body 1 into the gap. The length of the seal metal 6 along the longitudinal direction and the dimensional intersection of the gap are defined in advance so that the resin stays in the gap due to the increase in viscosity due to the decrease in pressure and temperature. Resin was prevented from leaking.

However, high dimensional accuracy is required for the through hole 6a in order to keep the dimensional intersection of the gap within a predetermined range. However, when machining a large member such as the side plate 6, the height of the through hole 6a is high. Processing with dimensional accuracy has been difficult. The present invention has been made in view of the above circumstances, and provides a T-die capable of easily increasing the dimensional accuracy between the side plate 6 and the deckle 7 and reliably preventing resin leakage from both ends of the T-die. That is the purpose.

[0010]

SUMMARY OF THE INVENTION The present invention comprises a pair of front and rear members extending in the width direction of a sheet-like molded product, a resin flow path opened downward between these members, A die body having a resin injection port communicating with the flow path,
In a T-die with a deckle, comprising a pair of right and left deckles slidably inserted along the longitudinal direction of the die body from both ends of the die body into the resin flow path, A pair of left and right side plates are supported at both ends, and a seal that covers the deckle from outside in the radial direction with the insertion of the deckle into a pair of left and right seal metal boxes supported outside the side plates. The feature is that the metal is detachably supported.

Here, the seal metal is pressed from the outside in the radial direction by screws provided in the seal metal box, and the seal metal is pressed in the radial direction by changing the pressing amount of the screws. Desirably, it can be elastically deformed.

[0012]

Embodiments of the present invention will be described below in more detail with reference to the drawings. Parts having the same configuration as the above-mentioned conventional T-die are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 to 3 show examples of the shape of a seal metal box 20 used for the T-die according to the present invention. FIGS.
FIG. 2 is a side view of the seal metal box.

The seal metal box 20 is an integrally molded product made of metal, and has a central portion provided with an opening communicating with the resin flow path 2 when the seal metal box 20 is installed on the outer end surface of the side plate 6. 21 are formed. Here, the opening 21 is formed in accordance with the shape and size of the seal metal so that the seal metal (described later) is inserted into the seal metal box 20 from one end face 20b side of the seal metal box 20 in close contact. I have.
The other end surface 20a side of the opening 21 is reduced in diameter according to the size of the deckle 7 to form a reduced diameter portion 21a. A slit 22 communicating with the land 5 opens downward.

On the other hand, reference numerals 23 and 23a denote screw holes for attaching the seal metal box 20 to the end face of the side plate 6 and pin holes for positioning the seal metal box 20 with respect to the side plate 6, respectively.
Is a screw hole for pressing the seal metal supported in the opening 21 from the outside in the radial direction to elastically deform the seal metal. Here, the screw hole 24 extends toward the center from the side surface of the seal metal box 20, and the tip thereof is open to the side surface of the opening 21 on one end surface 20 b side of the seal metal box 20.

FIGS. 4 and 5 show examples of the shape of the seal metal 30 used in the T-die of the present invention. FIG. 4 is a view showing an end face of the seal metal 30, and FIG. FIG.

The seal metal 30 is an integrally molded product made of metal, and has a resin flow path 2 when the seal metal 30 is inserted into the opening 21 of the seal metal box 20.
And an opening 31 through which the deckle 7 is inserted through a gap having a predetermined width. A slit 3 communicating with the lip land 5 and the slit 22 when inserted into the seal metal box 20 is provided at a lower end of the opening 31.
2 is open downward.

Here, the length of the seal metal 30 along the longitudinal direction of the deckle 7 when the seal metal box 20 is inserted (indicated by L in FIG. 5) and the width of the gap are determined by the resin flow path in molding the molded product. It is determined in advance that the molten resin that has flowed into the gap from Step 2 will remain in the seal metal 30 due to an increase in viscosity due to a decrease in pressure and a decrease in temperature.

Conditions for determining the length L of the seal metal 30 along the longitudinal direction and the width of the gap include, for example, pressure, temperature, viscosity, and the like of the molten resin in the resin flow path 2. Temperature difference between inside and outside of T die, material of deckle 7 and seal metal 30, and deckle 7
And the processing accuracy of the seal metal 30.

Next, the production of a molded product using a T-die having the seal metal box 20 and the seal metal 30 will be described with reference to FIG. First, seal metal 3
0 is inserted into the opening 21 from one end face 20b side of the seal metal box 20 and a screw (not shown) provided in the screw hole 24 is inserted into the seal metal box 30 at the tip.
Push in until it touches the side of. As a result, the seal metal 30 is supported in the opening 21 while being pressed from the outside in the radial direction by the tip of the screw.

Next, outside the side plates 6 provided at both ends of the die body 1 (not shown) (left side in FIG. 6).
And the seal metal box 20 on one end face 20 thereof.
b is attached to the resin flow path 2 side, and both ends of the die body 1 are closed. Further, the deckle 7 is inserted into the resin flow path 2 from the other end surface 20a side of the seal metal box 20 through the reduced diameter portion 21a and the opening 31, and the width of the molded product is adjusted. And in this state,
By extruding the molten resin supplied into the resin flow path 2, a sheet-shaped molded product having a uniform thickness and a uniform width can be obtained.

Here, as described above, the seal metal 30
The length L along the longitudinal direction of the deckle 7 when the seal metal box 20 is inserted, the opening 31 and the deckle 7
The width of the gap between them is set such that the molten resin that has flowed into the gap from the resin flow path 2 during molding of the molded product stays in the seal metal 30 due to an increase in viscosity due to a decrease in pressure and temperature.
It is predetermined. Therefore, during the production of a molded product, the molten resin in the resin flow path 2 remains in the seal metal 30,
As a result, leakage of the resin from both ends of the T-die is prevented.
Further, this effect is achieved by disposing the seal metal 30 on the outer side of the side plate 6 provided in the normal T die,
The effect obtained only by providing the gap between the deckle 7 and the deckle 7 extremely small and covering the periphery of the deckle 7 with the seal metal 30 from the outside in the radial direction.

Further, in the T-die according to the present invention, since the portion of the seal metal box 20 having the opening 31 requiring particularly high dimensional accuracy is formed by a separate member called the seal metal 30, the opening 31 is processed. Can be easily performed. Therefore, the width of the gap between the opening 31 and the deckle 7 can be easily maintained with high dimensional accuracy, and leakage of the resin from both ends of the T-die is more reliably prevented.

Further, the seal metal 30 is supported in the opening 21 by a screw provided in a screw hole 24 formed in the seal metal box 20 while being pressed from the outside in the radial direction of the opening 21. The seal metal 3
At the time of cleaning, etc., by removing the seal metal box 20 from the die body 1 and then loosening the screw,
The seal metal 30 can be easily removed.

In addition, the seal metal 30 is
By changing the position of the screw in the hole, the screw can be elastically deformed in the radial direction.
By increasing the pressing amount of 0, the seal metal 30 is elastically deformed so that the opening 31 is narrowed, and the width of the gap between the opening 31 and the deckle 7 is accurately adjusted, or the opening 31 is formed around the deckle 7. To prevent the molten resin from entering the gap. In addition, since the screw hole 24 is opened on the side surface of the seal metal box 20, the above operation is performed in the seal metal box 2
0 can be easily performed without removing it from the die body 1.

When the molten resin has a sufficient viscosity, there is no mechanism for adjusting the diameter of the opening 31 by the screw hole 24 as described above, and a seal in which the gap between the opening 31 and the deckle 7 is constant is provided. It is also possible to use a metal 30 to prevent leakage of resin from both ends of the T-die.

[0027]

As described above, according to the T-die of the present invention, the portion of the seal metal box requiring high dimensional accuracy is formed by a separate member called the seal metal, so that the dimension between the seal metal and the deckle is reduced. Accuracy can be easily increased, and leakage of resin from both ends of the T-die is reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view along an arrow I showing an example of a shape of a seal metal box used for a T-die according to the present invention.

FIG. 2 is a side view along an arrow II showing an example of a shape of a seal metal box used for a T-die according to the present invention.

FIG. 3 is a front view along an arrow III showing an example of a shape of a seal metal box used for a T-die according to the present invention.

FIG. 4 is a front view along an arrow IV showing an example of a shape of a seal metal according to the present invention.

FIG. 5 is a longitudinal sectional view taken along line VV showing an example of a shape of a seal metal according to the present invention.

FIG. 6 is an enlarged sectional view of an end of a T-die according to the present invention.

FIG. 7 is a side view of a conventional T-die taken along arrow VII.

FIG. 8 is a cross-sectional view of the conventional T-die taken along line VIII-VIII.

FIG. 9 is an enlarged sectional view of an end of a conventional T-die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die main body 2 Resin channel 3 Resin injection port 6 Side plate 7 Dickel 20 Seal metal box 30 Seal metal

Continued on the front page (72) Inventor Tadao Horie 1-22-7 Matsue, Edogawa-ku, Tokyo Inside Eshin Engineering Co., Ltd. (72) Inventor Tadahiko Ozaki 1-2-22-7 Matsue, Edogawa-ku, Tokyo Inside Eshin Engineering Co., Ltd.

Claims (2)

[Claims] 1. A sheet-like molded product comprising a pair of front and rear members extending in the width direction of a molded product, a resin flow path opening downward between these members, and a resin injection port communicating with the resin flow path. And a pair of right and left deckles slidably inserted from both ends of the die body into the resin flow path along the longitudinal direction of the die body, respectively. In the die, a pair of left and right side plates are respectively supported on both end sides of the die body, and the deckle is inserted into the pair of left and right seal metal boxes supported outside the side plates, respectively, as the deckle is inserted. A T-die with a deckle, characterized in that a seal metal covering from outside in a radial direction is detachably supported. 2. The seal metal is pressed from outside in the radial direction by a screw disposed in the seal metal box, and the seal metal is elastically deformed in the radial direction by changing the pressing amount of the screw. The T-die with a deckle according to claim 1, wherein the T-die with a deckle is deformable.