JP3660084B2 - T-die with deckle - Google Patents

Description

[0001]
BACKGROUND 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 extrusion of a sheet-like article, and in particular, a resin from both ends of the sheet-like article. The present invention relates to a T-die in which leakage is prevented.
[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.
[0003]
6 to 8 show an example of a T die. FIGS. 6 and 7 are a front view and a cross sectional view of the T die, respectively, and FIG. 8 is an enlarged vertical sectional view of an end portion of the T die. Reference numeral 1 denotes a die body. 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 serving as a resin flow path 2 is formed between these members. . As shown in FIG. 7, the resin flow path 2 includes an upper manifold portion 2 a having a substantially circular cross section when viewed from the end surface, and a slit-shaped land portion that hangs down from the upper manifold portion 2 a and opens at the lower end of the die body 1. 2b. A resin injection port 3 communicating with the resin flow channel 2 is formed above the resin flow channel 2.
[0004]
From the lower end of the die body 1, a pair of lip portions 4 project from the front and rear toward the center in the thickness direction of the land portion 2 b, and by these lip portions 4, below the land portion 2 b, at a predetermined interval in the front and rear direction. A slit-like space (lip land) 5 is formed. Here, the lower portion of the die body 1 is formed in a wedge shape having a predetermined angle downward as viewed from the end surface, and the lip portion 4 is formed on the sliding surface 4a of the lower portion of the die body 1 forming the wedge shape. It is supported so as to be slidable up and down along the wall surface 1a. 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 sandwiches the lip land 5 from the front and rear is a hanging surface 4b that hangs parallel to the land portion 2b.
[0005]
Both ends of the die body 1 and the die lip 4 are closed by side plates 6, and a pair of left and right deckles 7 are airtight along the longitudinal direction of the resin flow path 2 at both ends of the resin flow path 2. Each is slidably disposed. The deckle 7 penetrates the side plate 6 while having substantially the same cross section as the resin flow path 2 and is extended to both ends of the die body 1, respectively. As a result, as shown in FIG. It protrudes from the both ends of the die body 1 to the left and right.
[0006]
Further, as shown in FIG. 8, openings 8 having a predetermined depth are formed in the upper end portion of the deckle 7 from both ends of the T die along the longitudinal direction of the deckle 7, respectively. 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.
[0007]
On the other hand, reference numeral 12 denotes a sealing material disposed around the deckle 7 on the outside of the side plate 6 to prevent resin leakage, and reference numeral 13 denotes a longitudinal direction of the deckle 7 with the deckle fixing plate 10 via a bearing 14. Is a support bar that is movably supported along the axis.
[0008]
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, if necessary, the thickness and / or the width of the lip land 5 can be changed by changing the distance between the front and rear directions of the lip land 5 and / or the distance between the tips of the pair of deckles 7. A molded product is obtained.
[0009]
FIGS. 9 to 11 show other examples of the T die. FIGS. 9 and 10 are a front view and a transverse sectional view of the T die, respectively, and FIG. 11 is an enlarged longitudinal sectional view of an end portion of the T die. In the case of this T-die, a pair of left and right rod rods 15 extend along the longitudinal direction of the die body 1 at both ends of the lower end portion of the die body 1, and these rod rods 15 are located at the lower ends of the side plates 6. The rod piece plates 16 attached to both ends of the part are supported so as to be movable along the longitudinal direction of the die body 1. Further, the tip of the rod rod 15 is located in the land portion 2b of the resin flow path 2, and the side surface thereof is brought into contact with the sliding surface 4a of the lip portion 4 from above in the land portion 2b. The lip portion 4 is sealed from above.
[0010]
Also in the case of this T-die, the melted resin is supplied from the resin injection port 3 into the resin flow path 2 and further extruded from the lip land 5 to form a sheet-like article. Further, the thickness of the sheet-like article is defined by the gap in the front-rear direction of the lip land 5, and the molding width is defined by the positions of the tips of the pair of deckles 7 and the rod rod 11.
[0011]
[Problems to be solved by the invention]
However, in the case of the T-die, a space of about several millimeters is formed immediately below the deckle 7 or the rod rod 11, and therefore, during molding, the molten resin passes through these spaces to the deckle 7 or the rod rod 11. In some cases, it entered the bottom and leaked from both ends of the lip land 5. Since this resin falls on the molded product and causes defects in the molded product, conventionally, the resin is received by installing a tray below the both ends of the lip land 5 or the operator receives a slit. Although measures such as cleaning both ends of 5 were taken as appropriate, it was not a fundamental solution to the problem.
[0012]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a T-die that can prevent the intrusion of the resin into both ends of the T-die and the accompanying resin leakage from the both ends of the T-die. .
[0013]
[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 formed between these members and opening downward, and a resin communicating with the resin flow path A die main body having an inlet, a pair of lip portions that cover the lower end of the die main body from the front and rear, and form a slit-like space communicating with the resin flow path along the longitudinal direction of the die main body, and the resin A T-die with a deckle having a pair of left and right width-regulating deckles inserted in the resin channel along the longitudinal direction thereof at both ends of the flow path so as to be airtight and slidable. A resin saucer that extends downward from the lower end of the deckle and is inserted into the space so as to be airtightly slidable along the longitudinal direction thereof, and prevents resin from entering the both ends of the space. Prevention It is provided, and the distal end surface of the resin sagging blocking device has as its characterized in that there is a gradual inclined surface that protrudes inward in the width direction of the slit toward the bottom.
[0014]
Here, the deckle is vertically divided into a deckle body inserted into at least the upper part of the resin flow path and a bar deckle inserted into the space, and the resin tray is disposed at least at the tip of the bar deckle. A blocking tool may be provided.
[0015]
In addition, a slit-shaped gap is formed in the resin sagging prevention tool vertically along the longitudinal direction of the space, and the resin sagging prevention tool can be expanded and contracted along the thickness direction of the molded product. It may have sex. It is also possible to form the resin sagging prevention tool having the slit-shaped gap by overlapping a plurality of metal plates.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. Since the present invention relates to the improvement of the Dickel among the T dies, the other members constituting the T die are the same as those shown in FIGS. 6 to 11 in the following description. The description will be omitted using reference numerals.
[0017]
1 and 2 show an embodiment of a T-die according to the present invention. FIG. 1 is an enlarged cross-sectional view of a lower portion of the T-die, and FIG. 2 is an enlarged vertical cross-sectional view of an end portion of the T-die. . In this T die, a resin sagging prevention tool 20 extending downward from the lower end of the deckle 7 is provided integrally with the deckle 7 along the longitudinal direction of the deckle 7.
[0018]
Here, as shown in FIG. 1, the upper portion of the resin sagging prevention tool 20 is formed in a V shape so as to be flush with the sliding surface 4 a of the lip portion 4 when viewed from the end, and the resin sagging prevention tool 20. Is formed in a quadrangular shape whose thickness A is substantially the same as the distance in the front-rear direction of the lip land 5. Therefore, the resin sagging prevention tool 20 is brought into contact with the sliding surface 4a of the lip portion 4 from above and is inserted into the lip land 5 so as to be airtightly slidable along the longitudinal direction thereof.
[0019]
Further, for the purpose of improving the resin discharging property at the tip of the resin dripping preventer 20, the tip surface of the resin dripping preventer 20 is an inclined surface 21 that gradually protrudes toward the tip as shown in FIG. It is said that. On the other hand, the length of the resin sagging prevention tool 20 in the vertical direction is set so that the lower end thereof is positioned in the lip land 5 when the lower part thereof is inserted into the lip land 5.
[0020]
Next, the operation of the resin sagging prevention tool 20 will be described below. During molding, the portion of the lip land 5 sandwiched between the deckles 7 is filled with molten resin, but since the resin sagging prevention tool 20 is attached below the deckles 7, The penetration into the resin is prevented by the resin sagging prevention tool 20. As a result, the resin is pushed out along the inclined surface 21 toward the center in the width direction of the molded product without flowing down below the deckle 7 and quickly flows down.
[0021]
That is, in this T-die, since the resin sagging prevention tool 20 is provided below the deckle 7, it is difficult for the resin to go around the bottom of the deckle 7, and the resin enters the bottom of the deckle 7 at the time of molding and the resin associated therewith Leakage from both ends of the T-die is prevented. Moreover, since the front end surface of the resin sagging prevention tool 20 is the inclined surface 21, the resin breakage at the end portion of the sheet-like article becomes good, and high resin discharge performance is obtained. Further, since the upper part of the resin sagging prevention tool 20 comes into surface contact with the sliding surface 4a from above due to the downward force acting on the deckle 7 as the deckle 7 is inserted and slid into the resin flow path 2, the lip portion 4 also improves sealing performance.
[0022]
3 and 4 show another embodiment of the T-die according to the present invention. FIG. 3 is an enlarged cross-sectional view of the lower portion of the T-die, and FIG. 4 is an enlarged vertical cross-sectional view of the end portion of the T-die. is there. In this T-die, the deckle 7 is inserted into the upper manifold portion 2a and the land portion 2b of the resin flow path 2 above the deckle body 7a, and the bar deck 7b is inserted below the land portion 2b and into the space 5. The resin sagging prevention tool 20a is provided integrally with the bardickel 7b along the longitudinal direction of the deckel 7 at the lower end of the bardeckel 7b.
[0023]
Here, as shown in FIG. 3, the upper part of the resin sagging prevention tool 20a is formed in a V shape so as to be flush with the sliding surface 4a of the lip portion 4 when viewed from the end, and the resin sagging prevention tool 20a. The lower part of this has a quadrangular shape whose thickness is substantially the same as the distance in the front-rear direction of the lip land 5. Therefore, the resin sagging prevention tool 20a is brought into contact with the sliding surface 4a of the lip portion 4 from above and is inserted into the lip land 5 so as to be airtightly slidable along the longitudinal direction thereof.
[0024]
Further, as shown in FIG. 4, an inclined surface 21 a that gradually protrudes toward the center side of the slit 5 as it goes downward is formed on the distal end surface of the resin sagging prevention tool 20 a. On the other hand, the length of the resin sagging prevention tool 20 a in the vertical direction is set so that the lower end thereof is positioned in the lip land 5 when the lower part thereof is inserted into the lip land 5.
[0025]
The operation of the resin sagging prevention tool 20 a is the same as that of the resin sagging prevention tool 20. That is, intrusion of the resin below the deckle 7 during molding is prevented by the resin sagging prevention tool 20a, and as a result, the resin does not wrap around the bottom of the deckle 7 and the center of the molded product in the width direction along the inclined surface 21a. It is pushed out to the side and immediately flows downward.
[0026]
Therefore, also in this T-die, the penetration of the resin into the bottom of the deckle 7 and the accompanying leakage of the resin from both ends of the T-die are prevented, and the resin breakage at the end of the sheet-like article is good. Thus, high resin discharge performance can be obtained. Further, since the upper portion of the resin sagging prevention tool 20a is brought into surface contact with the sliding surface 4a from above by the downward force acting on the bar deck 7b as the deckle 7 is inserted and slid into the resin flow path 2, the lip 4 The sealing performance against is also improved.
[0027]
As described above, in the T die of the present invention, the resin sagging prevention tools 20 and 20a are provided below the deckle 7 so that the resin enters the both ends of the lip land 5 during molding and the resin T die associated therewith. Leakage from both ends of the resin is prevented, and high resin discharge performance is obtained. As a result, according to the present invention, it is possible to prevent the leaked resin from dropping onto a molded product or the like and the occurrence of defects in the molded product. Further, it is not necessary to install a tray below the both ends of the lip land 5 or to clean the both ends of the lip land 5 by an operator.
[0028]
In consideration of the smooth sliding of the resin sagging prevention tools 20 and 20a in the lip land 5 or the influence of thermal expansion on the sliding of the resin sagging prevention tools 20 and 20a, etc., the resin sagging facing the drooping surface 4b. It is desirable to provide a minute clearance between the side surfaces of the blocking tools 20 and 20a. In the case of the above embodiment, a clearance of 200 μm or less is provided between the drooping surface 4b and the side surfaces of the resin sagging prevention tools 20 and 20a.
[0029]
Further, for example, as shown in FIG. 5, a minute gap 22 having a slit shape is formed in the resin sagging prevention tools 20 and 20a in a comb blade shape vertically along the longitudinal direction of the lip land 5 (the direction of the arrow L in the figure). It may be formed. In this case, due to the presence of the gap 22, the resin sagging prevention tools 20, 20 a are given stretchability along the thickness direction of the molded product, and as a result, the resin sagging prevention tools 20, 20 a in the lip land 5 can be smoothly smoothed. It is possible to eliminate the influence of thermal expansion on sliding or sliding of the resin sagging prevention tools 20 and 20a.
[0030]
Here, the gap 22 may be formed, for example, by cutting a metal lump or the like, but may also be formed by stacking a plurality of flat plate-shaped metal plates and bonding and fixing the upper ends thereof to each other. Good.
[0031]
On the other hand, the resin sagging prevention tools 20 and 20a may be detachably attached to the lower part of the deckle 7 or the rod rod 12 by, for example, bolting or the like, and the deckle 7 or the rod rod 12 may be attached by welding or “caulking”. You may fix below.
[0032]
Moreover, although the said embodiment demonstrated the case where the resin dripping prevention tools 20 and 20a were provided in the lower end of the deckle 7 over the whole area, the resin dripping prevention tools 20 and 20a are at least the front-end | tip of the deckle 7 by the property. If it is provided in the part, it exerts its action.
[0033]
【The invention's effect】
As described above, in the T die of the present invention, the resin sagging prevention tool is provided below the deckle, so that the resin penetrates into both ends of the T die at the time of molding and the both ends of the resin T die accompanying the resin. Leakage from the water is prevented, and high resin discharge performance is obtained. As a result, according to the present invention, it is possible to prevent the leakage of the leaked resin onto a molded product and the occurrence of defects in the molded product. Further, it is not necessary to install a saucer below the both ends of the lip land or to clean the both ends of the lip land by an operator.
[Brief description of the drawings]
FIG. 1 is a transverse sectional view of a lower portion of a T die showing an example of a structure of a T die according to the present invention.
FIG. 2 is an enlarged longitudinal sectional view of an end portion of a T die showing an example of a structure of a T die according to the present invention.
FIG. 3 is a cross-sectional view of the lower portion of the T die showing an example of the structure of the T die according to the present invention.
FIG. 4 is an enlarged longitudinal sectional view of an end portion of a T die showing an example of a structure of a T die according to the present invention.
FIG. 5 is an upper perspective view of the resin sagging prevention tool showing an example of the structure of the resin sagging prevention tool according to the present invention.
FIG. 6 is a side view taken along the arrow VI of the T die showing an example of the structure of the T die.
FIG. 7 is a cross-sectional view taken along the line VII-VII of the T die showing an example of the structure of the T die.
FIG. 8 is an enlarged cross-sectional view of the end of a T die showing an example of the structure of the T die.
FIG. 9 is a side view showing an example of a structure of a T die.
FIG. 10 is a cross-sectional view along the line XX of the T die showing an example of the structure of the T die.
FIG. 11 is an enlarged cross-sectional view of an end portion of a T die showing an example of a structure of a T die.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Die body 2 Resin flow path 3 Resin injection hole 4 Lip part 4a Sliding surface 4b Bottom surface 5 Lip land 7 Dickel 7a Dickel body 7b Bar Dickel 20, 20a Resin sagging inhibitor 21, 21a Inclined surface 22 Clearance A Resin sagging inhibitor Thickness of

Claims (4)

A pair of front and rear members extending in the width direction of a sheet-shaped molded product, a resin flow path formed between these members and opening downward, and a resin injection port communicating with the resin flow path A die body, a pair of lip portions that cover the lower end of the die body from the front and back, and that form a slit-shaped space communicating with the resin flow path along the longitudinal direction of the die body, and both ends of the resin flow path At least a tip portion of the deckle, wherein the deckle has a pair of left and right width-regulating deckles inserted in the resin flow path along the longitudinal direction thereof in the air flow direction. In addition, there is provided a resin sagging preventer that extends downward from the lower end of the deckle and is inserted in the space so as to be airtightly slidable along the longitudinal direction thereof, and prevents the resin from entering both ends of the space. Et And the distal end surface of the resin sagging blocking device is set to gradually inclined surface that projects in the distal direction toward the downward,
In the resin sagging prevention tool, a slit-shaped gap is formed vertically along the longitudinal direction of the slit, and by this gap, the resin sagging prevention tool has elasticity along the thickness direction of the molded product. T-die with deckle characterized by having . 2. The T-die with deckle according to claim 1 , wherein the resin sagging prevention tool having the slit-shaped gap is formed by vertically stacking a plurality of metal plates along the longitudinal direction of the space. . A pair of front and rear members extending in the width direction of a sheet-shaped molded product, a resin flow path formed between these members and opening downward, and a resin injection port communicating with the resin flow path A die body, a pair of lip portions that cover the lower end of the die body from the front and back, and that form a slit-shaped space communicating with the resin flow path along the longitudinal direction of the die body, and both ends of the resin flow path At least a tip portion of the deckle, wherein the deckle has a pair of left and right width-regulating deckles inserted in the resin flow path along the longitudinal direction thereof in the air flow direction. In addition, there is provided a resin sagging preventer that extends downward from the lower end of the deckle and is inserted in the space so as to be airtightly slidable along the longitudinal direction thereof, and prevents the resin from entering both ends of the space. Et And the distal end surface of the resin sagging blocking member is gradually T-die with deckle, characterized in that is an inclined surface that protrudes inward in the width direction of the slit toward the bottom. The deckle is vertically divided into a deckle main body inserted into at least the upper part of the resin flow path and a bar deckle inserted into the space, and the resin sagging prevention tool is provided at least at the tip of the bar deckle. 4. The T-die with deckle according to claim 3 , wherein the T-die is provided.

Images