JPH10166423A - T-die fitted with deckle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically remove foreign matter attached to the deckles of a T-die. SOLUTION: A pair of left and right seal metal boxes 20 having through-holes 21 for inserting dickles 7 are respectively supported outside the side plates 6 supported on both end sides of a die main body and seal metals 30 covering the peripheries of the deckles 7 accompanied by the insertion of the deckles 7 are supported within the seal metal boxes 20 in a freely detachable manner. Further, a pair of left and right scrapers 40 and resin scrapers 52 coming into contact with the peripheries of the deckles 7 accompanied by the insertion of the deckles to remove foreign matter attached to the peripheries of the deckles 7 are respectively supported on the outsides of the seal metal boxes 20.

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. Examples of the structure of the T-die are shown in FIGS. 9 and 10 are a front view and a sectional view of the T-die, respectively, and FIG. 11 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. 10, the resin flow path 2 hangs in parallel from the upper manifold portion 2a 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 2a, 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. 9, it protrudes left and right from both ends of the die body 1.

[0006] As shown in FIG.
Openings 8 having a predetermined depth are formed at both ends of the T-die along the longitudinal direction of the deckle 7 at both ends of the T-die. Has been inserted from each. 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]

The deckle 7 is inserted into the through-hole 6a through a gap having a predetermined width, but the side plate 6 is radiated from the molten resin.
Due to the thermal expansion or thermal distortion of the resin, or the wear of the inner peripheral surface of the through-hole 6a, the above-mentioned gap expands, and as a result, the resin or resin degraded material that has entered the gap may adhere to the surface of the deckle 7. . This foreign matter causes the deckle 7 to pass through the resin flow path 2.
When sliding inside the resin flow path 2 together with the deckle 7
In order to lower the quality of the molded product by invading into the inside and scratching the inner peripheral surface of the main body of the resin flow path 2 or mixing with the molded product, it is necessary to periodically remove the molded product. However, conventionally, this foreign matter has been scraped off by human power, which has been problematic in that the removal requires labor and effort.

The present invention has been made in view of the above circumstances, and has as its object to obtain a T-die capable of automatically and surely removing the foreign matter as the deckle 7 moves.

[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,
A pair of left and right side plates supported on both ends of the die main body, a pair of left and right seal metal boxes supported outside the side plates, a seal metal supported in these seal metal boxes, A pair of right and left deckles slidably inserted along the longitudinal direction of the die body through the side plate, the seal metal box, and the seal metal from both ends of the body and into the resin flow path. In the T-die with a deckle, a pair of right and left scrapers that abut the periphery of the deckle with the insertion of the deckle and remove foreign matters adhered to the periphery of the deckle are supported on the outside of the seal metal box, respectively. And the tip of the scraper is inserted into the seal metal from outside. Together, and its characterized by abutting the periphery of the deckle by the elastic deformation of the radially inwardly due to insertion into the seal in the metal.

[0011] The amount of elastic deformation of the tip of the scraper inward in the radial direction can be adjusted by changing the amount of insertion of the scraper into the seal metal. In this case, it is desirable that the tip of the scraper be wedge-shaped in the insertion direction.

It is also possible to support a pair of left and right resin scrapers on the outer side of the scraper, which contact the periphery of the deckle as the deckle is inserted and remove foreign matters adhering around the deckle. is there.

[0013]

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.

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. This is a screw hole for pressing the applied seal metal from outside in the radial direction to elastically deform the seal metal. Here, the screw hole 24 extends from the side surface of the seal metal box 20 toward the center, and its tip is
Is opened on the side surface of the opening 21 on one end surface 20b side of the opening. Reference numeral 25 denotes a screw hole for supporting a scraper (described later) on the other end surface 20a 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. Further, the opening 31 is provided at one end of the seal metal 30 at one end of the seal metal 30.
The tapered surface 31a is formed so that the diameter gradually increases toward.

Here, the length (indicated by L in FIG. 5) of the seal metal 30 along the longitudinal direction of the deckle 7 when the seal metal box 20 is inserted and the width of the gap are determined by the resin flow path during molding of the molded product. The molten resin flowing from above 2 into the gap is predetermined so that the molten resin stays in the seal metal 30 due to a rise in viscosity due to a decrease in pressure and a decrease in temperature, and leakage of the resin to the outside is prevented.

The conditions for determining the length L of the seal metal 30 along the longitudinal direction and the width of the gap include, for example, the pressure, temperature, viscosity, and viscosity 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.

FIGS. 6 and 7 show examples of the shape of the scraper 40 used in the T-die of the present invention. FIG. 6 is a sectional view of the scraper, and FIG. 7 is a view showing the end face of the scraper 40.

The scraper 40 is an integrally molded product made of metal. The scraper 40 communicates with the manifold 2 when the scraper 40 is inserted into the reduced diameter portion 21a of the seal metal box 20, and the deckle 7 has a central portion. An opening 41 to be inserted is provided.

The lower end of the communication port 41 is opened downward by a slit 42 communicating with the lip land 5 and the slits 22 and 32 when the communication port 41 is inserted into the seal metal box 20. , The outer peripheral surface of the scraper 40 to the tapered surface 31 a of the seal metal 30.
The taper surface 43 is formed by gradually reducing the diameter toward the tip end at the same angle as that of the scraper 40.
Oa has a wedge shape.

On the other hand, a flange portion 44 is formed at the base end of the scraper 40, and a screw hole 45 for supporting the scraper 40 is formed in the flange portion 44 on the other end surface 20 a side of the seal metal box 20. Have been.
That is, the scraper 40 is supported by the seal metal box 20 via screws (described later) screwed into the screw holes 45 and the screw holes 25 of the seal metal box 20, and the rotation of the screws causes the seal metal box 20 to rotate. Scraper 4 to seal metal 30 supported in 20
The insertion amount of 0 can be adjusted.

Further, the tip 40a side of the scraper 40
With the insertion of the scraper 40 into the seal metal box 20, it can be elastically deformed inward in the radial direction. As a result, the tip of the scraper 40 can be brought into contact with the periphery of the deckle 7 at an arbitrary pressure due to the elastic deformation of the tip 40a due to the rotation of the screw screwed into the screw holes 25 and 45.

Next, the production of a molded product using a T-die having the seal metal box 20, the seal metal 30, and the scraper 40 will be described with reference to FIG. First, the seal metal 30 is inserted into the opening 21 from one end 30a side through the one end face 20b of the seal metal box 20, and a screw (not shown) provided in the screw hole 24. )) Until it contacts the side surface of the seal metal 30. As a result, in a state where the seal metal 30 is pressed from the radial outside by the tip of the screw,
It is supported in the opening 21.

Next, the scraper 40 is moved to its tip end 40.
a side, the other end face 20 of the seal metal box 20
a into the reduced diameter portion 21a via the
Is screwed into the screw hole 25 of the seal metal box 20 via the screw hole 45 of the scraper 40. As a result, the scraper 40 is supported by the seal metal box 20,
And the taper surface 31a of the seal metal 30 and the scraper 4
The 0 tapered surface 43 abuts inside the seal metal box 20.

Thereafter, outside the side plates 6 provided on 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. Furthermore, a pair of deckles 7
Is inserted into the resin flow path 2 from the other end face 20a side of the seal metal box 20 via the openings 41 and 31, respectively, to adjust the width of the molded product. 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, 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 processing of the opening 31 is performed. 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 disposed 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.

On the other hand, when foreign matter such as resin deterioration adheres to the surface of the deckle 7, the screw 50 screwed into the screw holes 25 and 45 is rotated to insert the scraper 40 into the side plate 20. . Then, the tapered surface 43 moves toward the inside of the side plate 20 along the tapered surface 31a and is elastically deformed radially inward. As a result, the wedge-shaped tip 40a of the scraper 40 moves from the periphery to the surface of the deckle 7. At any pressure.

By moving the deckle 7 to both ends in this state, the foreign matter adhering to the surface of the deckle 7 is automatically and reliably scraped off by the tip 40a, and the foreign matter enters the manifold 2. This can prevent the accompanying damage in the manifold 2. In addition, the foreign matter removed by the scraper 40 falls into the catch pan 51 supported below the scraper 40.

As indicated by reference numeral 52, a resin scraper for removing foreign substances adhering to the periphery of the deckle 7 as the deckle 7 is inserted can be attached to the outside of the scraper 40 via, for example, screws 50 or the like. It is. The resin scraper 52 is an integrally molded product made of, for example, a fluororesin, and has a resin flow path 2 when the resin scraper 52 is attached to the scraper 40 at the center thereof.
And an opening 53 through which the deckle 7 is inserted.

The opening 53 has substantially the same cross section as the deckle 7 and is slightly smaller in diameter than the deckle 7. As a result, the opening 5
The inner peripheral surface of 3 is in contact with the periphery of the deckle 7 at a predetermined pressure. By moving the deckle 7 to both ends in this state, the foreign matter adhered to the surface of the deckle 7 is automatically and reliably scraped off by the resin scraper 52, and the foreign matter adhered to the periphery of the deckle 7 is removed. Removed.

That is, the combined use of the scraper 40 and the resin scraper 52 makes it possible to more reliably remove foreign substances adhering to the surface of the deckle 7. Also,
Since the material of the resin scraper 52 is softer than the deckle 7, even if the inner peripheral surface of the opening 53 is pressed against the periphery of the deckle 7, the surface of the deckle 7 is not damaged. Further, the resin scraper 52 can be used by being integrally laminated on the metal scraper 40.

In the case where the molten resin has a sufficient viscosity, the seal having the constant gap between the opening 31 and the deckle 7 does not have the above-described mechanism for adjusting the diameter of the opening 31 by the screw hole 24. It is also possible to use a metal 30 to prevent leakage of resin from both ends of the T-die.

[0039]

As described above, according to the T-die of the present invention, since the scrapers are provided at both ends of the T-die, the foreign substances adhering to the surface of the deckle can be automatically and reliably moved by moving the deckle. It can be removed.

[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 a longitudinal sectional view taken along a line VI-VI showing an example of a shape of a scraper according to the present invention.

FIG. 7 is a front view along an arrow VII showing an example of the shape of the scraper according to the present invention.

FIG. 8 is an enlarged sectional view of an end of a T-die according to the present invention.

FIG. 9 is a side view of a conventional T-die taken along an arrow IX.

FIG. 10 is a cross-sectional view of a conventional T-die taken along line XX.

FIG. 11 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 inlet 6 Side plate 7 Dickel 20 Seal metal box 30 Seal metal 40 Scraper 40a Scraper tip 52 Resin scraper

 ──────────────────────────────────────────────────続 き 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 E New engineering

Claims (4)

[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 left and right side plates supported on both ends of the die body, a pair of left and right seal metal boxes respectively supported outside these side plates, and supported in these seal metal boxes. Seal metal, from both ends of the die body, penetrate the side plate, the seal metal box, and the seal metal, and slidably along the longitudinal direction of the die body into the resin flow path. In a T-die with a deckle having a pair of right and left deckles inserted, the above-mentioned Dickel is inserted into the outside of the seal metal box with the insertion of the deckle. A pair of left and right scrapers that contact the periphery of the deckle and remove foreign matter adhering to the periphery of the deckle are respectively supported, and the tip of the scraper is inserted into the seal metal from the outside and the inside of the seal metal is removed. A T-die with a deckle, characterized in that it comes into contact with the periphery of the deckle by elastic deformation inward in the radial direction accompanying insertion into the deckle. 2. A deckle with a deckle according to claim 1, wherein the amount of elastic deformation of the tip of the scraper radially inward can be adjusted by changing the amount of insertion of the scraper into the seal metal. T die. 3. The T-die with a deckle according to claim 1, wherein a tip portion of the scraper has a wedge shape in the insertion direction. 4. A pair of left and right resin scrapers, which are in contact with the periphery of the deckle as the deckle is inserted and remove foreign matters adhering to the periphery of the deckle, are respectively supported outside the scraper. The T-die with a deckle according to claim 1, 2, or 3.