JP3660086B2 - T-die with deckle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a T-die with deckle (hereinafter abbreviated as T-die) connected to the lower end of an extruder for extrusion of a sheet-like article.
[0002]
[Prior art]
For example, in an extruder for extruding a sheet-like article such as a film, a flat plate having a uniform width and thickness is obtained by connecting a T die to the lower end and extruding molten resin through the T die. A shaped molded product is obtained. Examples of the structure of the T die are shown in FIGS. Here, 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 portion of the T die.
[0003]
In the figure, reference numeral 1 denotes a die body, and the die body 1 is composed of 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 interposed between these members. Is formed. As shown in FIG. 10, the resin flow path 2 hangs down in parallel from the upper manifold portion 2 a having a substantially circular cross section when viewed from the end and the upper manifold portion 2 a so that the thickness in the front-rear direction is the same, It is composed of a slit-like land portion 2 b that opens at the lower end of the die body 1. A resin injection port 3 communicating with the resin flow channel 2 is formed above the resin flow channel 2.
[0004]
Reference numeral 4 denotes a pair of front and rear lip portions respectively projecting from the lower end of the die body 1 toward the center portion in the thickness direction of the land portion 2b. A slit-like space (lip land) 5 is formed. Here, the lower part of the die body 1 is formed in a wedge shape having a predetermined angle downward, and the lip part 4 is formed along the wall surface 1a of the lower part of the die body 1 forming the wedge shape on the sliding surface 4a. And slidably supported up and down. As a result, it is possible to adjust the distance in the front-rear direction of the lip land 5 (that is, the thickness of the molded product) by the vertical movement of the lip portion 4 along each wall surface 1a. Furthermore, a portion of the lip portion 4 that forms the lip land 5 is a hanging surface 4b that hangs parallel to the land portion 2b.
[0005]
Reference numeral 6 denotes a pair of left and right side plates that closes both ends of the die body 1 and the lip portion 4. In the resin flow path 2, a pair of deckles 7 extend along the longitudinal direction of the resin flow path 2 from both ends. Are slidably inserted. The deckle 7 has substantially the same cross section as that of the resin flow path 2 and extends through the through holes 6a formed in the side plate 6 to both ends of the die body 1, respectively, as shown in FIG. The die body 1 protrudes left and right from both ends.
[0006]
Further, as shown in FIG. 11, at the upper end of the deckle 7, openings 8 having a predetermined depth are formed along the longitudinal direction of the deckle 7 from both ends of the T die, and in these openings 8, Sliding screws 9 are inserted from both ends of the T die. These sliding screws 9 pass through a Dickel fixing plate 10 that supports the Dickel 7 from the base end side, and are screwed to a moving nut 11 provided outside the Dickel fixing plate 10. Then, the deckle 7 can slide in the resin flow path 2 by the rotation of the moving nut 11. On the other hand, reference numeral 12 denotes a support bar that supports the deckle fixing plate 10 through the bearing 13 so as to be movable along the longitudinal direction of the deckle 7.
[0007]
In the production of the molded product, the molten resin is supplied from the resin injection port 3 into the resin flow path 2 by the extruder and pushed out from the lip land 5, and as a result, according to the distance in the front-rear direction of the lip land 5. A sheet-like molded product having a uniform thickness and a uniform width according to the distance between the tips of the pair of deckles 7 is formed. Further, by changing the width of the lip land 5 and the distance between the tips of the pair of deckles 7 as necessary, molded articles having different thicknesses and widths can be obtained using the same die body 1.
[0008]
[Problems to be solved by the invention]
By the way, the deckle 7 is inserted into the through hole 6a through a gap having a predetermined width. However, thermal expansion or thermal distortion of the side plate 6 due to radiant heat from the molten resin, wear of the inner peripheral surface of the through hole 6a, or the like. As a result, the gap is enlarged, and as a result, it may adhere to the surface of the deckle 7 such as a resin or a resin deteriorated material that has entered the gap. When the deckle 7 slides in the resin flow path 2, the foreign matter enters the resin flow path 2 together with the deckle 7, scratches the inner peripheral surface of the main body of the resin flow path 2, or In order to reduce the quality of the molded product due to mixing or the like, it is necessary to remove it periodically. However, in the past, since this foreign matter was scraped off manually, there was a problem in that it required manual labor and labor to remove it.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a T-die that can automatically and reliably remove the foreign matter as the deckle 7 moves.
[0010]
[Means for Solving the Problems]
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 that opens downward between these members, and a resin inlet that communicates with the resin flow path. A die body having 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 supported on the outside of the side plates, and supported in the seal metal boxes. From both end sides of the seal metal and the die body, the side plate, the seal metal box, and the seal metal are passed through and inserted into the resin flow path along the longitudinal direction of the die body. In a T-die with deckle having a pair of left and right deckles, the deckle is inserted into the outside of the seal metal box as the deckle is inserted. A pair of left and right scrapers that contact the periphery of the kel and remove foreign matter adhering to the periphery of the deckle are supported, and the tip of the scraper is inserted into the seal metal from the outside, and the inside of the seal metal The amount of elastic deformation of the scraper tip radially inward by changing the amount of insertion of the scraper into the seal metal due to elastic deformation inward in the radial direction accompanying insertion into the seal metal The scraper tip is wedge-shaped in the insertion direction, and a flange is provided at the base end of the scraper. The flange has a screw at the end of the seal metal box. A screw hole into which a screw to be screwed into the hole is inserted is provided .
[0012]
It is also possible to support a pair of left and right resin scrapers that come into contact with the periphery of the deckle as a result of the insertion of the deckle, and to remove foreign matter adhering to the periphery of the deckle, on the outside of the scraper.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. In addition, about the part which has the structure similar to the said conventional T die, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
[0014]
1 to 3 show examples of the shape of the seal metal box 20 used in the T-die of the present invention. FIGS. 1 and 3 are views showing end faces 20a and 20b of the seal metal box 20, respectively. FIG. 3 is a side view of a seal metal box.
[0015]
The seal metal box 20 is an integrally molded product made of metal, and an opening 21 is formed in the center of the seal metal box 20 to communicate with the resin flow path 2 when the seal metal box 20 is installed on the outer end surface of the side plate 6. Has been. Here, the opening 21 is formed according to the shape and size of the seal metal so that the seal metal (described later) is closely inserted into the seal metal box 20 from the one end face 20b side of the seal metal box 20. Yes. Further, the other end face 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, and the lower end of the opening 21 is a lip when fitted to the die body 1. A slit 22 communicating with the land 5 opens downward.
[0016]
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, and reference numeral 24 denotes a seal supported in the opening 21. It is a screw hole for pressing a metal from the outside in the radial direction to elastically deform it. Here, the screw hole 24 extends from the side surface of the seal metal box 20 toward the center portion, and the tip thereof opens to the side surface of the opening 21 on one end surface 20 b side of the seal metal box 20. Reference numeral 25 is a screw hole for supporting a scraper (described later) on the other end face 20 a of the seal metal box 20.
[0017]
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 the end face of the seal metal 30 and FIG. 5 is a cross-sectional view of the seal metal 30. .
[0018]
The seal metal 30 is an integrally molded product made of metal, and at the center thereof, when the seal metal 30 is inserted into the opening 21 of the seal metal box 20, it communicates with the resin flow path 2, and the deckle 7 has a predetermined width. The opening 31 inserted through the gap is provided. Further, a slit 32 communicating with the lip land 5 and the slit 22 when opened in the seal metal box 20 is opened downward at the lower end of the opening 31. Furthermore, a tapered surface 31 a formed by gradually increasing the diameter of the opening 31 toward one end 30 a of the seal metal 30 is formed at one end of the opening 31.
[0019]
Here, the length (symbol 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 as described above from the resin flow path 2 when the molded product is molded. It is determined in advance that the molten resin that has flowed into the gap remains in the seal metal 30 due to an increase in viscosity accompanying a decrease in pressure and temperature, and leakage of the resin to the outside is prevented.
[0020]
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, and viscosity of the molten resin in the resin flow path 2 and the inside and outside of the T die. Temperature difference, the material of the deckle 7 and the seal metal 30, the processing accuracy of the deckle 7 and the seal metal 30, and the like.
[0021]
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 an end face of the scraper 40.
[0022]
The scraper 40 is an integrally formed product made of metal, and 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 is inserted at the center thereof. An opening 41 is provided.
[0023]
Further, 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 inserted into the seal metal box 20, and the scraper 40 has a scraper 40 on the tip 40 a side. A tapered surface 43 is formed by gradually reducing the diameter of the outer peripheral surface toward the tip side at the same angle as the taper surface 31a of the seal metal 30. As a result, the tip 40a of the scraper 40 has a wedge shape.
[0024]
On the other hand, a flange portion 44 is formed at the base end portion of the scraper 40, and a screw hole 45 for supporting the scraper 40 is formed on the flange portion 44 on the other end surface 20 a side of the seal metal box 20. . That is, the scraper 40 is supported by the seal metal box 20 through screws (described later) screwed into the screw holes 45 and the screw holes 25 of the seal metal box 20, and the seal metal box is rotated by the rotation of the screws. The amount of insertion of the scraper 40 into the seal metal 30 supported within 20 can be adjusted.
[0025]
Furthermore, the tip end 40 a side of the scraper 40 can be elastically deformed radially inward with the insertion of the scraper 40 into the seal metal box 20. As a result, the tip of the scraper 40 can come into contact with the periphery of the deckle 7 with an arbitrary pressure by elastic deformation on the tip 40a side as the screw screwed into the screw holes 25 and 45 rotates.
[0026]
Next, the manufacture of a molded product using a T die including 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 portion 30a side of the seal metal box 20 through the one end face 20b of the seal metal box 20, and a screw (not shown) is provided in the screw hole 24. .) Is pushed in until it comes into contact with the side surface of the seal metal 30. 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.
[0027]
Next, the scraper 40 is inserted into the reduced diameter portion 21a from the tip 40a side through the other end surface 20a side of the seal metal box 20, and the screw 50 is inserted into the seal metal through the screw hole 45 of the scraper 40. Screwed into the screw hole 25 of the box 20. As a result, the scraper 40 is supported by the seal metal box 20, and the tapered surface 31 a of the seal metal 30 and the tapered surface 43 of the scraper 40 abut on each other in the seal metal box 20.
[0028]
Thereafter, the seal metal box 20 is placed on the outside (left side in FIG. 6) of the side plate 6 provided at both ends of the die body 1 (not shown) so that one end face 20b faces the resin flow path 2 side. Each is attached and both ends of the die body 1 are closed. Further, the pair of deckles 7 are inserted into the resin flow path 2 from the other end face 20a side of the seal metal box 20 through the openings 41 and 31, respectively, and the width of the molded product is adjusted. In this state, the molten resin supplied into the resin flow path 2 is extruded to obtain a sheet-like molded product having a uniform thickness and a uniform width.
[0029]
Here, as described above, the length L 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 between the opening 31 and the deckle 7 are resin when molding a molded product. It is determined in advance that the molten resin that has flowed into the gap from the flow path 2 stays in the seal metal 30 due to an increase in viscosity accompanying a decrease in pressure and temperature. Therefore, when the molded product is manufactured, the molten resin in the resin flow path 2 stays in the seal metal 30, and as a result, leakage of the resin from both ends of the T die is prevented.
[0030]
Furthermore, in the T-die according to the present invention, the portion having the opening 31 that requires particularly high dimensional accuracy in the seal metal box 20 is configured by a separate member called the seal metal 30, so that the opening 31 can be easily processed. It is possible to do it. Therefore, the width of the gap between the opening 31 and the deckle 7 can be easily maintained with high dimensional accuracy, and resin leakage from both ends of the T die can be prevented more reliably.
[0031]
Furthermore, the seal metal 30 is supported in the opening 21 while being pressed from the outside in the radial direction of the opening 21 by screws arranged in the screw holes 24 formed in the seal metal box 20. When the seal metal 30 is cleaned, the seal metal 30 can be easily removed by loosening the screws after removing the seal metal box 20 from the die body 1.
[0032]
Moreover, since the seal metal 30 can be elastically deformed in the radial direction by changing the position of the screw in the screw hole 24, the screw is further pushed into the screw hole 24, and the seal metal 30 by the screw is used. By increasing the pressing amount, 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 adjusted accurately, or the opening 31 is placed around the deckle 7. It is also possible to prevent the molten resin from entering the gap by making contact. Further, since the screw hole 24 is opened on the side surface of the seal metal box 20, the above operation can be easily performed without removing the seal metal box 20 from the die body 1.
[0033]
On the other hand, when foreign matter such as a deteriorated resin adheres to the surface of the deckle 7, the screw 50 screwed into the screw holes 25 and 45 is rotated and the scraper 40 is inserted into the side plate 20. Then, the tapered surface 43 moves inward 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 Abut with an arbitrary pressure.
[0034]
In this state, the deckle 7 is moved to both ends, so that the foreign matter adhering to the surface of the deckle 7 is automatically and surely scraped off by the tip 40a. The accompanying damage in the manifold 2 can be prevented. In addition, the foreign matter removed by the scraper 40 falls into a catch pan 51 supported below the scraper 40.
[0035]
As indicated by reference numeral 52, a resin scraper that removes foreign matters attached to the periphery of the deckle 7 when the deckle 7 is inserted can be attached to the outside of the scraper 40 via, for example, screws 50. The resin scraper 52 is an integrally molded product made of, for example, a fluororesin, and communicates with the resin flow path 2 when the resin scraper 52 is attached to the scraper 40, and the deckle 7 is inserted in the center thereof. An opening 53 is formed.
[0036]
The opening 53 has a cross section substantially the same shape as the deckle 7 and is slightly smaller in diameter than the deckle 7. As a result, the inner peripheral surface of the opening 53 is predetermined around the deckle 7 as the deckle 7 is inserted. Contact with the pressure of. In this state, by moving the deckle 7 to both ends, the foreign matter adhering to the surface of the deckle 7 is automatically and reliably scraped off by the resin scraper 52, and the foreign matter attached around the deckle 7 is removed. Removed.
[0037]
That is, by using the scraper 40 and the resin scraper 52 in combination, it is possible to more reliably remove the foreign matter adhering to the surface of the deckle 7. Further, since the material of the resin scraper 52 is softer than the deckle 7, the surface of the deckle 7 will not be damaged even if the inner peripheral surface of the opening 53 is brought into pressure contact with the periphery of the deckle 7. Furthermore, the resin scraper 52 can be used by being integrally laminated on the metal scraper 40.
[0038]
When the molten resin has a sufficient viscosity, the sealing metal 30 having a constant gap between the opening 31 and the deckle 7 is not provided without the above-described diameter adjusting mechanism of the opening 31 by the screw hole 24. It is also possible to prevent leakage of resin from both ends of the T die.
[0039]
【The invention's effect】
As described above, according to the T-die of the present invention, since the scrapers are provided at both ends of the T-die, it is possible to automatically and reliably remove foreign matter adhering to the surface of the deckle by moving the deckle. It becomes.
[Brief description of the drawings]
FIG. 1 is a front view along an arrow I showing an example of the shape of a seal metal box used in a T die according to the present invention.
FIG. 2 is a side view along an arrow II showing an example of the shape of a seal metal box used in a T die according to the present invention.
FIG. 3 is a front view along an arrow III showing an example of the shape of a seal metal box used for the T-die according to the present invention.
FIG. 4 is a front view along an arrow IV showing an example of the 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 the shape of the seal metal according to the present invention.
FIG. 6 is a longitudinal sectional view along an arrow VI-VI line showing an example of the shape of the scraper according to the present invention.
FIG. 7 is a front view taken along arrow VII showing an example of the shape of the scraper according to the present invention.
FIG. 8 is an enlarged cross-sectional view of an end portion of a T die according to the present invention.
FIG. 9 is a side view taken along arrow IX of a conventional T die.
FIG. 10 is a cross-sectional view taken along line XX of a conventional T die.
FIG. 11 is an enlarged cross-sectional view of an end portion of a conventional T die.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Die body 2 Resin flow path 3 Resin inlet 6 Side plate 7 Dickel 20 Seal metal box 30 Seal metal 40 Scraper 40a Scraper tip 52 Resin scraper

Claims (2)

A die main body comprising a pair of front and rear members extending in the width direction of a sheet-like molded product, and having a resin flow channel opening downward between these members and a resin injection port communicating with the resin flow channel 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 supported on the outside of the side plates, and a seal metal supported in these seal metal boxes, A pair of left and right sides inserted through the side plate, the seal metal box, and the seal metal from both ends of the die body and slidably inserted in the resin flow path along the longitudinal direction of the die body. In a T-die with a deckle having a deckle, the outer circumference of the deckle is inserted outside the seal metal box as the deckle is inserted. And a pair of left and right scrapers that remove foreign matter adhering to the periphery of the deckle are supported, and the tip of the scraper is inserted into the seal metal from the outside, and inserted into the seal metal. Abutting around the above Dickel due to elastic deformation inward in the radial direction ,
By changing the amount of the scraper inserted into the seal metal, the amount of elastic deformation of the scraper tip radially inward can be adjusted,
The tip of the scraper has a wedge shape in the insertion direction,
A flange is provided at the base end of the scraper, and the flange is provided with a screw hole into which a screw to be screwed into the screw hole at the end of the seal metal box is provided. T-die.   A pair of left and right resin scrapers that contact the periphery of the deckle as a result of the insertion of the deckle and that remove foreign matter adhering to the periphery of the deckle are supported on the outside of the scraper, respectively. 1. T-die with deckle as described in 1.

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