JP2023005405A - Sheet molded mouthpiece - Google Patents

Abstract

To provide a sheet molded mouthpiece that can stably produce sheets by controlling leakage of sheet material from an end face of a side plate and a lip.SOLUTION: In a sheet molded mouthpiece of the present invention, a flow channel for discharging a sheet material is formed between a pair of opposing lips and side plates, a portion of one lip that serves as a discharge port of the flow channel is a flexible portion extending in a width direction of the sheet material, and a plurality of adjustment bolts that push and pull the flexible portion are attached side by side in the width direction of the sheet material. A groove is formed from an upstream end to a downstream end in the sheet material flow direction in an area sandwiched between the side plate and the adjustment bolt next to the side plate on a surface of the flexible portion that is pushed and pulled by the adjustment bolt.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sheet molding die.

Please refer to FIG. FIG. 8 is a diagram of a general sheet molding die, the upper side is a view viewed from the width direction of the sheet material, and the lower side is a view viewed from the flow direction of the sheet material. As a general sheet molding die, a sheet material (typically molten resin, etc.) melted by an extruder or the like is formed by a pair of opposed lips 1 and side plates 9 installed at both ends. It is known that the sheet material is formed into a sheet shape and discharged from the passage 2 along the flow direction of the sheet material, and the thickness distribution in the width direction of the sheet material is adjusted by adjusting the gap of the passage 2 with an adjusting bolt 4 . . A flexible portion 3 extending in the width direction of the sheet material is formed at a portion of the lip 1 that serves as a discharge port of the flow path 2, and a plurality of adjusting bolts 4 are arranged side by side in the width direction of the sheet material. The adjustment bolt 4 pushes and pulls the flexible portion 3 to adjust the gap of the flow path 2 .

Patent Literature 1 discloses a T die for extrusion molding in which a hollow through hole is introduced for the purpose of narrowing the range of interference while maintaining the installation space for the hexagonal nut that fixes the flexible lip adjusting bolt. FIG. 10 is an arrow view of the T-die for extrusion molding of Patent Document 1 observed from the flow direction of the sheet material. As shown in FIG. 10, since the flexible lip adjustment bolt 4 is fixed to the flexible portion 3 with the hexagonal nut 6, the seat of the hexagonal nut 6 contacts the flexible portion 3. Directional dimensions are required. On the other hand, by lowering the rigidity of the flexible portion 3 between the adjusting bolts 4, it is possible to narrow the range of "interference" in which the adjusting bolts 4 adjacent to the pushed and pulled adjusting bolts 4 also move. Therefore, in the T die for extrusion molding of Patent Document 1, in the flexible portion 3 between the adjustment bolts 4, a slit 7 having a small width direction dimension of the sheet material is provided near the hexagonal nut 6 to maintain the installation space of the hexagonal nut 6. In the vicinity of the lip land 2, the rigidity of the flexible portion 3 is lowered and the range of interference is effectively narrowed by providing a hollow through hole 8 having a large dimension in the width direction of the sheet material.

JP-A-2002-178386

In recent years, there is a strong demand for stability in film formation from the viewpoint of increasing production volume and lowering prices. One of the failure phenomena that deteriorate this stability is leakage of sheet material generated from the contact surface between the side plate of the mouthpiece and the end face of the lip. This leaked sheet material adheres to the formed sheet and induces membrane rupture, which may cause a serious situation that stops membrane production. Various studies have been conducted on this omission, and many causes have been elucidated. One of them is the phenomenon that the end surface of the lip is tilted when the adjustment bolt near the end is pushed and pulled, and the sheet material leaks. This leakage cannot be suppressed by using a side plate to increase the force pushing the lip, which is a general countermeasure against leakage.

The above-mentioned Patent Document 1 does not disclose that the end surface of the lip is inclined and the leakage of the sheet material occurs, and a method for suppressing it is not disclosed.

SUMMARY OF THE INVENTION The present invention provides a sheet forming die capable of suppressing leakage of sheet material from end faces of side plates and lips and stably manufacturing sheets.

A first sheet forming die of the present invention for solving the above-mentioned problems has a pair of opposed lips and side plates provided at both ends of the pair of lips to form a flow path for discharging a sheet material,
At least one of the pair of lips has a flexible portion extending in the width direction of the sheet material, and
A plurality of adjusting bolts for pushing and pulling the flexible portion are arranged side by side in the width direction of the sheet material,
The surface of the flexible portion pushed and pulled by the adjusting bolt extends from the upstream end to the downstream end in the flow direction of the sheet material in the range sandwiched between the adjusting bolt adjacent to the side plate and the side plate. A groove is formed.

In the first sheet molding die of the present invention, when the dimension of the flexible portion in the thickness direction of the sheet material is T1 [mm], and the depth of the groove in the thickness direction of the sheet material is T2 [mm], (T1-T2)/ T1 is preferably 0.2 or less.

In the first sheet molding die of the present invention, the dimension of the flexible portion in the thickness direction of the sheet material is T1 [mm], the depth of the groove in the thickness direction of the sheet material is T2 [mm], and the dimension of the groove in the width direction of the sheet material. is W1 [mm], W1/(T1-T2) is preferably 1.0 or more.

In the first sheet molding die of the present invention, it is preferable that the bottom surface of the groove is arcuate in cross section perpendicular to the flow direction of the sheet material.

In the second sheet forming die of the present invention for solving the above-mentioned problems, a flow path for discharging a sheet material is formed by a pair of opposed lips and side plates provided at both ends of the pair of lips,
At least one of the pair of lips has a flexible portion extending in the width direction of the sheet material, and
A plurality of adjusting bolts for pushing and pulling the flexible portion are arranged side by side in the width direction of the sheet material,
A hole penetrating from the upstream side to the downstream side in the sheet material flow direction is formed in a range of the flexible portion sandwiched between the adjustment bolt adjacent to the side plate and the side plate.

In the second sheet forming die of the present invention, when the dimension of the flexible portion in the sheet material thickness direction is T3 [mm] and the dimension of the hole in the sheet material thickness direction is T4 [mm], (T3-T4)/T3 is preferably 0.2 or less.

In the second sheet forming die of the present invention, the dimension of the flexible portion in the thickness direction of the sheet material is T3 [mm], the dimension of the hole in the thickness direction of the sheet material is T4 [mm], and the dimension of the hole in the width direction of the sheet material is Assuming that W2 [mm], W2/(T3-T4) is preferably 1.0 or more.

In the second sheet forming die of the present invention, the holes are preferably circular or elongated in cross section perpendicular to the flow direction of the sheet material.

[Glossary]
Next, the meaning of each term used in the present invention will be explained.
"Sheet material" refers to the material that makes up the sheet. Examples of sheet materials include polyolefin resins such as polyethylene, polypropylene, polystyrene, and polymethylpentene; alicyclic polyolefin resins; polyamide resins such as nylon 6 and nylon 66; Polyester resins such as polybutyl succinate and polyethylene-2,6-naphthalate, polycarbonate resins, polyarylate resins, polyacetal resins, polyphenylene sulfide resins, tetrafluoroethylene resins, trifluoroethylene resins, trifluoroethylene chloride resins, Fluororesins such as ethylene tetrafluoride-propylene hexafluoride copolymers and vinylidene fluoride resins, acrylic resins, methacrylic resins, polyacetal resins, polyglycolic acid resins, polylactic acid resins, etc. can be used. These thermoplastic resins may be homo-resins, copolymers or blends of two or more. In each thermoplastic resin, various additives such as antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, organic particles, viscosity reducing agents, heat stabilizers, lubricants, infrared absorbers, ultraviolet absorbers, An agent, a dopant for adjusting the refractive index, or the like may be added.

A "sheet molding die" refers to a die that molds a sheet material into a sheet and discharges it.
The terms "sheet material thickness direction" and "sheet material width direction" refer to directions that coincide with the thickness direction and width direction of the sheet, respectively, when the sheet material is formed into a sheet shape using a die.
"Sheet material flow direction" refers to the direction in which the sheet material flows through the channel.
"Lip" refers to a pair of members forming a surface perpendicular to the thickness of the channel through which the sheet material flows.
The term “side plate” refers to a member that is installed at both ends of the lip in the width direction of the sheet material and forms a surface that is perpendicular to the width direction of the channel through which the sheet material flows.
"Adjusting bolt" means a member that is arranged in the width direction of the sheet material and attached in plurality and that pushes and pulls the flexible portion. Push-pull power includes screws, thermal expansion, hydraulic pressure, pneumatic pressure, and motors.
The "flexible portion" refers to a portion of the lip that is moved by pushing and pulling the adjustment bolt and becomes a discharge port of the flow path. Generally, it is in the range of 50 to 100 mm upstream from the discharge port.
"The surface of the flexible portion that is pushed and pulled by the adjusting bolt" refers to the surface of the flexible portion to which the adjusting bolt is attached and that is perpendicular to the thickness direction of the sheet material.
"Adjusting bolt next to the side plate" refers to the adjustment bolts closest to the side plate, which are attached to both ends of the sheet material width direction among the multiple adjusting bolts installed side by side in the sheet material width direction of the lip. say.

By using the sheet forming die of the present invention, it is possible to stably manufacture a sheet without requiring a complicated device, preventing the inclination of the lip end face and suppressing leakage of the sheet material.

FIG. 2 is a view of the first sheet molding die of the present invention, the upper side is an arrow view observed from the sheet material width direction, and the lower side is a sheet material flow direction arrow view. FIG. 4 is an arrow view of the first sheet molding die of the present invention with the adjustment bolt next to the side plate being pulled, observed from the direction of flow of the sheet material. FIG. 2 is an arrow view of the first sheet molding die of the present invention having grooves with an arcuate bottom surface, viewed from the flow direction of the sheet material. FIG. 2 is an arrow view of the first sheet molding die of the present invention having keyhole-shaped grooves as viewed from the flow direction of the sheet material. FIG. 4 is an arrow view of the second sheet molding die of the present invention observed from the flow direction of the sheet material; FIG. 4 is an arrow view of the second sheet molding die of the present invention having circular holes as viewed from the flow direction of the sheet material. FIG. 4 is an arrow view of the second sheet forming die of the present invention having elongated holes, viewed from the flow direction of the sheet material. It is a figure of a general sheet molding die, the upper side is the arrow view observed from the sheet material width direction, and the lower side is the arrow view observed from the sheet material flow direction. FIG. 4 is an arrow view of a general sheet forming die with an adjusting bolt next to a side plate being pulled, observed from the sheet material flow direction. FIG. 2 is an arrow view of the T-die for extrusion molding of Patent Document 1 observed from the flow direction of the sheet material.

The sheet molding die of the present invention will be described in detail below with reference to the drawings. These drawings are conceptual diagrams for accurately conveying the gist of the present invention, and the drawings are simplified. can be changed.

First, the mechanism of sheet material leakage, which is a problem in the prior art, will be described with reference to FIGS. 8 and 9. FIG.

FIG. 8 is an arrow view of a general sheet molding die observed from the sheet material width direction and the sheet material flow direction. FIG. 9 is an arrow view of a general sheet forming die in a state where the adjustment bolt 5 adjacent to the side plate 9 is pulled, viewed from the sheet material flow direction. First, the present inventors found that in a general sheet molding die such as that shown in FIG. We focused on the occurrence of , and found out the mechanism. As shown in FIG. 9, when the adjusting bolt 5 adjacent to the side plate 9 is pushed or pulled, the surface 15 of the flexible portion 3 forming the flow path 2 is tilted. Then, due to the rigidity of the flexible portion 3 in the range sandwiched between the adjustment bolt 5 and the side plate 9, the end surface 14 of the lip 1 is also inclined, and a gap is generated between the side plate 9 and the end surface 14 of the lip 1, and the sheet material leaks.

[First sheet molding die]
Next, the first sheet molding die of the present invention for solving this problem will be described with reference to FIG. FIG. 1 is a view of the first sheet molding die, the upper side is a view viewed from the width direction of the sheet material, and the lower side is a view viewed from the flow direction of the sheet material. Members having the same applications and functions as those of the prior art may be given the same reference numerals.

As a result of extensive studies by the inventors of the present invention, as shown in FIG. Leakage of the sheet material from the side plate 9 and the end surface 14 of the lip 1 is prevented by forming the groove 10 extending from the upstream end 12 in the sheet material flow direction to the downstream end 13 in the range sandwiched between the side plate 9 and the lip 1 . It has been found that the sheet can be produced stably by suppressing it.

The technical meaning of the present invention will be described below with reference to FIG. FIG. 2 is an arrow view of the first sheet molding die with the adjustment bolt next to the side plate 9 pulled, viewed from the flow direction of the sheet material. By forming the groove 10, the volume of the flexible portion 3 in the range sandwiched between the adjustment bolt 5 and the side plate 9 is reduced, and the rigidity is lowered. Then, as shown in FIG. 2, even if the surface 15 forming the flow path 2 of the flexible portion 3 inclines when the adjustment bolt 5 is pushed or pulled, the end surface 14 of the lip 1 does not incline, and the side plate 9 does not incline. The leakage of the sheet material from the contact surface between the lip 1 and the end surface 14 of the lip 1 can be suppressed. Two or more grooves 10 may be formed in the range sandwiched between the adjustment bolt 5 and the side plate 9 .

In the first sheet molding die, (T1-T2)/T1 is 0, where T1 [mm] is the dimension of the flexible portion 3 in the thickness direction of the sheet material, and T2 [mm] is the depth of the groove 10 in the thickness direction of the sheet material. .2 or less. Although the effects of the present invention can be obtained even when (T1-T2)/T1 is greater than 0.2, by setting (T1-T2)/T1 to 0.2 or less, the flexible portion 3 Since the difference in rigidity between the two becomes large, the effect of the present invention becomes remarkable. (T1-T2)/T1 is more preferably 0.15 or less. The lower limit of (T1-T2)/T1 is not particularly limited, but if T2 is too large, the rigidity of the flexible portion 3 becomes too low, so in reality (T1-T2)/T1 is preferably 0.1 or more. .

In the first sheet forming die, the dimension of the flexible portion 3 in the thickness direction of the sheet material is T1 [mm], the depth of the groove 10 in the thickness direction of the sheet material is T2 [mm], and the dimension of the groove 10 in the width direction of the sheet material is W1 [mm]. mm], W1/(T1-T2) is preferably 1.0 or more. Even if W1/(T1-T2) is less than 1.0, the effect of the present invention can be obtained. Since the difference in rigidity between the two becomes large, the effect of the present invention becomes remarkable. W1/(T1-T2) is more preferably 1.2 or more. The upper limit of W1/(T1-T2) is not particularly limited, but if W1 is too large, the rigidity of the flexible portion 3 becomes too low. .

Please refer to FIGS. Fig. 3 is an arrow view of the first sheet molding die with an arcuate bottom surface of the groove observed from the flow direction of the sheet material, and Fig. 4 is an arrow view of the first sheet molding die with a keyhole-shaped groove observed from the flow direction of the sheet material. FIG. As shown in FIG. 3, the first sheet forming die preferably has an arcuate bottom surface of the groove 10 in a cross section perpendicular to the direction of flow of the sheet material. The effect of the present invention can be obtained even if the bottom surface of the groove 10 has a cross section perpendicular to the flow direction of the sheet material and is not arc-shaped. Furthermore, the stress generated at the bottom surface of the groove 10 is reduced, and the plastic deformation of the flexible portion 3 is suppressed, so that the effect of the present invention can be exhibited continuously. Also, if the bottom surface of the groove 10 is arc-shaped, it may be of a keyhole shape as shown in FIG.

When the bottom surface of the groove 10 is arcuate, T2 is the length from the surface 16 of the flexible portion 3 to the deepest position of the arcuate portion in the thickness direction of the sheet material. W1 is the width of the widest portion of the groove 10 in the sheet material width direction including the arcuate portion.

[Second sheet molding die]
Please refer to FIG. FIG. 5 is an arrow view of the second sheet molding die of the present invention as viewed from the flow direction of the sheet material. In the second sheet forming mouthpiece, a rectangular shape penetrating from the upstream side in the sheet material flow direction to the downstream side in the range sandwiched between the adjusting bolt 5 adjacent to the side plate 9 and the side plate 9 of the flexible portion 3. A hole 11 is formed. The groove 10 was formed in the first sheet molding die, but even if the hole 11 is formed instead of the groove 10, the sheet from the side plate 9 and the end face 14 of the lip 1 is formed as in the first sheet molding die. Suppresses leakage of materials and stably manufactures sheets.

In the second sheet molding die, if the dimension of the flexible portion 3 in the thickness direction of the sheet material is T3 [mm], and the dimension of the hole 11 in the thickness direction of the sheet material is T4 [mm], then (T3-T4)/T3 is 0. It is preferably 2 or less. Even if (T3-T4)/T3 is greater than 0.2, the effect of the present invention can be obtained. Since the difference in rigidity between the two becomes large, the effect of the present invention becomes remarkable. (T3-T4)/T3 is more preferably 0.15 or less. The lower limit of (T3-T4)/T3 is not particularly limited, but if T4 is too large, the rigidity of the flexible portion 3 becomes too low, so in reality (T3-T4)/T3 is preferably 0.1 or more. .

In the second sheet forming die, the sheet material thickness direction dimension of the flexible portion 3 is T3 [mm], the sheet material thickness direction dimension of the hole 11 is T4 [mm], and the sheet material width direction dimension of the hole 11 is W2 [mm]. ], W2/(T3-T4) is preferably 1.0 or more. Although the effects of the present invention can be obtained even when W2/(T3-T4) is less than 1.0, by setting W2/(T3-T4) to 1.0 or more, the flexible portion 3 Since the difference in rigidity between the two becomes large, the effect of the present invention becomes remarkable. W2/(T3-T4) is more preferably 1.2 or more. The upper limit of W2/(T3-T4) is not particularly limited, but if W2 is too large, the rigidity of the flexible portion 3 becomes too low, so in reality W2/(T3-T4) is preferably 2.0 or less .

6 and 7 are referred to. FIG. 6 is an arrow view of the second sheet molding die having circular holes, viewed from the flow direction of the sheet material. FIG. 7 is an arrow view of the second sheet forming die having elongated holes, viewed from the flow direction of the sheet material. In the second form of the sheet forming die of the present invention, as shown in FIGS. 6 and 7, the holes 11 are preferably circular or elongated in cross section perpendicular to the sheet material flow direction. . The effect of the present invention can be obtained even if the hole 11 has a cross section perpendicular to the flow direction of the sheet material and is not circular or elongated. Since the plastic deformation of the flexible portion 3 is suppressed, the effects of the present invention can be exhibited continuously.

When the hole 11 is circular or slotted, T4 is the length of the longest portion in the thickness direction of the sheet material. W2 is the length of the longest portion in the width direction of the sheet material.

Examples of sheet production using the sheet molding die of the present invention are shown below. Here, in Examples 1 to 4, the dimension of the flexible portion in the thickness direction of the sheet material is T1 [mm], the dimension of the groove in the thickness direction of the sheet material is T2 [mm], and the dimension of the groove in the width direction of the sheet material is W1 [mm]. ]. In Examples 5 to 8, the dimension of the flexible portion in the thickness direction of the sheet material is T3 [mm], the dimension of the hole in the thickness direction of the sheet material is T4 [mm], and the dimension of the hole in the width direction of the sheet material is W2 [mm]. and

[Example 1]
A sheet was actually manufactured using the first sheet forming die shown in FIG. 1, and the results of evaluating leakage of the sheet material from the lip end face will be described. Specific specifications of the sheet molding die, sheet manufacturing method, and leakage evaluation method in this embodiment are as follows.
(1) Sheet material: Polypropylene.
(2) Extrusion: The sheet material was supplied to an extruder set at 190°C, passed through a gear pump and a filter, and then supplied to a sheet forming die while increasing the flow rate from 100 to 500 kg/h.
(3) Sheet molding die: The discharge width was set to 900 mm, and the interval between adjustment bolts was set to 25 mm.
The surface 16 of the flexible portion 3 pushed and pulled by the adjusting bolt extends from the upstream end to the downstream end in the sheet material flow direction in the range sandwiched between the adjusting bolt 5 adjacent to the side plate 9 and the side plate 9. One groove 10 was formed. T1 was 25 mm, T2 was 16 mm, W1 was 2 mm, and (T1-T2)/T1 was 0.36, and W1/(T1-T2) was 0.22. Further, the bottom surface of the groove 10 was straight in a cross section perpendicular to the flow direction of the sheet material. The force with which the side plate 9 pushed the end surfaces of the pair of lips was 20 MPa.
(4) Adjusting bolt operation: The adjusting bolt 5 next to the side plate 9 was pulled out by 0.2 mm from the state in which the sheet material thickness direction dimension of the discharge port was made uniform at 2.0 mm in the sheet material width direction.
(5) Molding: After being extruded into a sheet form from a sheet molding die, it was cooled and solidified by a casting drum and molded.
(6) Leakage evaluation: The maximum discharge rate (hereinafter referred to as the limit discharge rate) at which visually recognizable leakage of the sheet material does not occur was confirmed to be 200 kg/h. This is condition 1. As condition 2, after the adjustment bolt 5 adjacent to the side plate 9 was pushed and pulled 200 times by 0.2 mm, the limit discharge amount was checked again and found to be 150 kg.

[Example 2]
A sheet was formed under the same conditions as in Example 1 using a sheet forming die having the same configuration as in Example 1, except that T2 was changed to 22 mm. (T1-T2)/T1 was 0.12, and W1/(T1-T2) was 0.67. The critical discharge rate was 300 kg/h under condition 1 and 200 kg/h under condition 2.

[Example 3]
A sheet was formed under the same conditions as in Example 2 using a sheet molding die having the same configuration as in Example 2, except that W1 was changed to 4 mm. W1/(T1-T2) was 1.33. The critical discharge rate was 400 kg/h under condition 1 and 250 kg/h under condition 2.

[Example 4]
A sheet was formed under the same conditions as in Example 3 using the same sheet molding die as in Example 3, except that the bottom surface of the groove was changed to have an arc shape in the cross section perpendicular to the flow direction of the sheet material. . That is, the film was formed using the sheet molding die shown in FIG. The limit discharge rate was 400 kg/h for both conditions 1 and 2.

[Example 5]
A sheet was formed using the second sheet molding die illustrated in FIG. Specifically, the configuration is the same as that of the first embodiment except that one hole 11 is formed instead of the groove 10 in the range sandwiched between the adjustment bolt 5 adjacent to the side plate 9 of the flexible portion 3 and the side plate 9. A sheet was formed under the same conditions as in Example 1 using the sheet molding die of No. T3 was 25 mm, T4 was 16 mm, W2 was 2 mm, and (T3-T4)/T3 was 0.36, and W2/(T3-T4) was 0.22. Also, the shape of the hole 11 was rectangular in cross section perpendicular to the flow direction of the sheet material. The critical discharge rate was 200 kg/h under condition 1 and 150 kg/h under condition 2.

[Example 6]
A sheet was formed under the same conditions as in Example 5 using a sheet molding die having the same configuration as in Example 5, except that T4 was changed to 22 mm. (T3-T4)/T3 was 0.12, and W2/(T3-T4) was 0.67. The critical discharge rate was 300 kg/h under condition 1 and 200 kg/h under condition 2.

[Example 7]
A sheet was formed under the same conditions as in Example 6 using the same sheet molding die as in Example 6, except that W2 was changed to 4 mm. W2/(T3-T4) was 1.33. The critical discharge rate was 400 kg/h under condition 1 and 250 kg/h under condition 2.

[Example 8]
A sheet was formed under the same conditions as in Example 7 using the same sheet forming die as in Example 7, except that the holes 11 were changed to have an elongated shape in the cross section perpendicular to the flow direction of the sheet material. . That is, the film was formed using the sheet molding die shown in FIG. The limit discharge rate was 400 kg/h for both conditions 1 and 2.

[Comparative Example 1]
A sheet molding die having the same configuration as that of Example 1 was used except that neither the groove 10 nor the hole 11 was formed in the range between the adjustment bolt 5 adjacent to the side plate 9 of the flexible portion 3 and the side plate 9. Then, a sheet was formed under the same conditions as in Example 1. The limit discharge rate was 100 kg/h for both conditions 1 and 2.

[Comparative Example 2]
A sheet was formed under the same conditions as in Comparative Example 1, using a sheet forming die having the same configuration as in Comparative Example 1, except that the force with which the side plate 9 pushed the end faces of the pair of lips was changed to 60 MPa. The limit discharge rate was 150 kg/h for both conditions 1 and 2.

Table 1 shows the structure of the sheet forming die and the film formation results of the sheets in Examples 1 to 8 and Comparative Examples 1 and 2.

[Evaluation of results of Examples and Comparative Examples]
In the sheet molding die of Examples 1 to 8, the groove 10 or the hole 11 was formed in the flexible portion 3, so the flexible portion 3 in the range sandwiched between the side plate 9 and the adjustment bolt 5 adjacent to the side plate 9 was formed. , and the lip end face 14 did not tilt even when the adjustment bolt 5 was operated.

In the sheet forming die of Example 2, (T1-T2)/T1 was 0.2 or less, and in the sheet forming die of Example 6, (T3-T4)/T3 was 0.2 or less. was improved to 300 kg/h.

The sheet molding die of Example 3 has (T1-T2)/T1 of 0.2 or less and W1/(T1-T2) of 1.0 or more, and the sheet molding die of Example 7 has (T3-T4)/T3. was 0.2 or less, and W2/(T3-T4) was 1.0 or more, so the limit discharge rate under Condition 1 was further improved to 400 kg/h.

In the sheet forming die of Examples 1 to 3 and 5 to 7, under the condition 2 where the adjustment bolt 5 adjacent to the side plate 9 was pushed and pulled several times, excessive stress was generated in the groove 10 or the hole 11 and the flexible portion 3 was plastically deformed, and the limit discharge amount decreased. However, since the frequency of pushing and pulling the adjusting bolt 5 adjacent to the side plate 9 by 0.2 mm is not high in reality, even if the limit discharge amount after pushing and pulling the adjusting bolt 5 by 0.2 mm 200 times However, there is no problem in practical use.

On the other hand, in the sheet forming die of Examples 4 and 8, excessive stress was suppressed by making the base of the groove 10 arc-shaped or making the hole 11 long-hole-shaped in the cross section perpendicular to the flow direction of the sheet material. Therefore, even under condition 2, the limit ejection amount was the same as under condition 1.

In the sheet molding die of Comparative Example 1, when the adjusting bolt 5 adjacent to the side plate 9 is pushed and pulled, the surface forming the flow path of the flexible portion 3 inclines, and the range sandwiched between the adjusting bolt 5 and the side plate 9 becomes flexible. Due to the rigidity of the flexible portion 3, the end face 14 of the lip is also inclined, so that the limit discharge rate was 100 kg/h for both conditions 1 and 2.

In the sheet forming die of Comparative Example 2, the force of pressing the pair of lip end faces 14 by the side plate 9 was increased to 60 MPa in the sheet forming die of Comparative Example 1, but the inclination of the lip end faces 14 was not eliminated. 2 both had a limit discharge rate of 150 kg/h.

From the above results, it can be seen that the structure of the sheet forming die of the present invention has a remarkable effect even in comparison with the countermeasure against leaks in a general sheet forming die, in which side plates are used to increase the force pushing the end faces of the pair of lips. I understand.

According to the present invention, it is possible to prevent the inclination of the lip end surface, suppress leakage of the sheet material, and stably manufacture the sheet.

1 pair of lips 2 channel 3 flexible portion 4 adjustment bolt 5 adjustment bolt next to side plate 6 hexagon nut 7 slit 8 cavity through hole 9 side plate 10 groove 11 hole 12 sheet material flow direction upstream edge 13 sheet material flow direction Downstream end 14 End face 15 of the lip 1 Surface 16 forming the flow path of the flexible portion Surface pushed and pulled by the adjustment bolt of the flexible portion

Claims (8)

A flow path for discharging the sheet material is formed by a pair of opposed lips and side plates provided at both ends of the pair of lips,
At least one of the pair of lips has a flexible portion extending in the width direction of the sheet material at a portion that serves as a discharge port of the flow path,
A sheet forming die, wherein a plurality of adjusting bolts for pushing and pulling the flexible portion are arranged side by side in the width direction of the sheet material,
The surface of the flexible portion that is pushed and pulled by the adjusting bolt extends from the upstream end to the downstream end in the sheet material flow direction in the range sandwiched between the adjusting bolt adjacent to the side plate and the side plate. Sheet molding die with grooves. Where T1 [mm] is the dimension of the flexible portion in the thickness direction of the sheet material, and T2 [mm] is the depth of the groove in the thickness direction of the sheet material, (T1−T2)/T1 is 0.2 or less. 1 sheet molding die. Assuming that the dimension of the flexible portion in the thickness direction of the sheet material is T1 [mm], the depth of the groove in the thickness direction of the sheet material is T2 [mm], and the dimension of the groove in the width direction of the sheet material is W1 [mm], W1/( 3. The sheet forming die according to claim 1, wherein T1-T2) is 1.0 or more. 4. The sheet forming die according to any one of claims 1 to 3, wherein the bottom surface of said groove is arcuate in cross section perpendicular to the flow direction of the sheet material. A flow path for discharging the sheet material is formed by a pair of opposed lips and side plates provided at both ends of the pair of lips,
At least one of the pair of lips has a flexible portion extending in the width direction of the sheet material at a portion that serves as a discharge port of the flow path,
A sheet forming die, wherein a plurality of adjusting bolts for pushing and pulling the flexible portion are arranged side by side in the width direction of the sheet material,
A sheet molding die, wherein a hole penetrating from the upstream side to the downstream side in the flow direction of the sheet material is formed in a range of the flexible portion sandwiched between the adjustment bolt adjacent to the side plate and the side plate. Claim 5, wherein (T3-T4)/T3 is 0.2 or less, where T3 [mm] is the dimension of the flexible portion in the thickness direction of the sheet material, and T4 [mm] is the dimension of the hole in the thickness direction of the sheet material. sheet molding die. Assuming that the dimension of the flexible portion in the sheet material thickness direction is T3 [mm], the dimension of the hole in the sheet material thickness direction is T4 [mm], and the dimension of the hole in the sheet material width direction is W2 [mm], W2/(T3 -T4) is 1.0 or more, the sheet forming die of claim 5 or 6. The sheet forming die according to any one of claims 5 to 7, wherein said holes are circular or elongated in cross section perpendicular to the sheet material flow direction.

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