JP2014094475A - Sheet forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet forming device which can improve a yield in sheet forming.SOLUTION: A sheet forming device is provided with: a material extrusion part 1 which extrudes a material M to be formed forward from an extrusion port 11; a material rolling part 2 which receives the material M to be formed, extruded from the material extrusion part 1, and forms the material M to be formed into a sheet shape to discharge it by a pair of rolls 21; and a material storage part 3 which temporarily stores the material M to be formed, extruded from the material extrusion part 1, between the material extrusion part 1 and the material rolling part 2. A pair of side wall parts 3G which partition both right and left sides of the material storage part 3 are configured to include an extrusion port-side part 31 and a part 32 between rolls which are located on the extrusion port 11 side and the roll 21 side, respectively, so as to sandwich a common tangent of the pair of rolls 21. An inner surface part 31b, facing the inside of the material storage part 3, of the inner surface 31S of the extrusion port-side part 31 of each of the pair of side wall parts 3G is formed in a curved surface shape following the curved line shape of the extrusion port 11.

Description

  The present invention includes a material extruding part that extrudes a molding material forward from an extrusion port, a material rolling part that accepts the molding material extruded from the material extruding part, forms the sheet into a sheet shape with a pair of rolls, and The present invention relates to a sheet forming apparatus provided with a material storage part for temporarily storing a material to be extruded extruded from the material extrusion part between the material extrusion part and the material rolling part.

Such a sheet forming apparatus manufactures a sheet material by forming a material to be formed into a sheet shape. In the operation, the molding material to be extruded from the material extruding part is temporarily stored in the material storage part, and the molding material temporarily stored in the material storage part in this way is the material rolling part. It is paid out while being formed into a sheet by a pair of rolls.
As a molding material, rubber materials, such as a compound for tires, are mentioned, for example.

In such a sheet forming apparatus, the pair of side walls that define the left and right sides of the material storage unit include an extrusion port side portion on the extrusion port side across the shared tangent of the pair of rolls, and an inter-roll side portion on the roll side. It is configured with.
Conventionally, of the inner surfaces of the pair of side wall portions, the left-right distance, which is the distance between the inner surfaces of the extrusion port side portions, is constant in the vertical direction under the condition that the width in the horizontal direction of the extrusion port is wider. (For example, refer to Patent Documents 1 and 2).

JP-A-9-1631 No. 8-1069

By the way, the molding material extruded from the extrusion port to the material storage portion is stretched in the left-right direction, is pulled by a pair of rotating rolls, proceeds forward, enters the gap between the pair of rolls, and is formed into a sheet shape. The
However, the conventional sheet forming apparatus is configured such that, of the inner surfaces of the pair of side wall portions, the left-right distance between the inner surfaces of the extrusion port side portions is constant in the vertical direction. Therefore, the molding material on the upper side of the molding material extruded from the extrusion port to the material storage portion spreads in the left-right direction and hardly flows downward when hitting the inner surface of the extrusion port side portion of the side wall portion. Therefore, in the rear view of the extrusion port (when viewed from the roll side, the same applies hereinafter), the material to be molded is placed on the extrusion port side in the upper region between the mouth edge of the extrusion port and the inner surface of the extrusion port side portion. A staying area that stays in contact with the inner surface of the portion is likely to occur, and the staying area tends to be widened.
And, in this way, in the rear view of the extrusion port, when a wide retention area of the molding material occurs in the upper region between the edge of the extrusion port and the inner surface of the extrusion port side portion, The flow is hindered, and it is difficult to sufficiently fill the molding material in the vicinity of the inner surface of the side wall portion in the material storage portion downstream thereof. For this reason, the width of the molding material entering the gap between the pair of rolls becomes narrower or the amount of the end in the left-right direction decreases, and the width of the molded sheet-like material (hereinafter referred to as “sheet width”). Is unstable, and unevenness in the sheet width direction tends to occur at the left and right edges of the sheet-like material.

  By the way, when the supply of the molding material from the material supply source to the material extruding unit approaches the end time, the material rolling unit may be controlled so as to change the discharge amount of the sheet-like material. In such a case, the occurrence of unevenness of the edge of the sheet-like material as described above becomes remarkable. That is, if the balance between the material extrusion amount of the material extrusion portion and the material discharge amount of the material rolling portion is lost, irregularities are likely to occur on the edge of the sheet-like material.

  And when unevenness occurs in the edge of the sheet-like material, the sheet width of the sheet-like material becomes narrower than the target sheet width and may be treated as a defect, and when the recessed portion of the generated edge is deep, the sheet Since a crack may enter the shaped material and the sheet-like material may be cut, the yield is likely to decrease, and there is room for improvement in improving the yield in sheet molding of the molding material.

  By the way, in view of such circumstances, the present applicant has previously proposed a sheet forming apparatus that can improve the yield in sheet forming (Japanese Patent Application No. 2011-125558. It is referred to as “the claimed invention”).

FIG. 1 shows an embodiment of a sheet forming apparatus according to the invention of the prior application.
In this sheet forming apparatus, the material extruding part 1 for extruding the forming material M forward from the extrusion port 11 and the forming material M extruded from the material extruding part 1 are received, and the axis 21a is in a posture along the horizontal direction. A material rolling part 2 which is formed and discharged into a sheet shape by a pair of rolls 21 arranged in the vertical direction, and a molding material M extruded from the material extruding part 1 between the material extruding part 1 and the material rolling part 2 is temporarily It comprises the material storage part 3 which stores automatically, and the control part C etc. which control an operation | movement.
Further, a conveyor unit between the material rolling unit 2 and the sheet material processing apparatus 70 that draws the sheet material Ms and performs a predetermined process in the material rolling unit 2 is provided with a conveyor device that loosens the sheet material Ms. A buffer unit 60 is provided.

In this embodiment, the material storage part 3 is comprised by the upper open shape which has the upper opening part 30 in the upper part.
Then, the molding material M stored in the material storage unit 3 intersects the extrusion direction Ds of the molding material M from the material extrusion unit 1 (hereinafter, also referred to as “material extrusion direction”). A pressure application unit 4 that applies pressure by pressing the pressing member 41 in the downward material pressing direction Dp is provided.

Next, description will be made regarding each part of the sheet forming apparatus. In the following description, the horizontal direction and the vertical direction in FIG. 3 are defined as the horizontal direction and the vertical direction, respectively.
As shown in FIGS. 1, 2, and 4, the pair of rolls 21 of the material rolling unit 2 is such that the upper roll 21 is on the opposite side (front side) to the material storage unit 3 side than the lower roll 21. It is arranged side by side along the up-down direction in the shape of a tilted forward position.
One of the upper and lower rolls 21 is rotationally driven by a rotary drive device 22 such as a motor to send out the molding material M, and the one roll 21 that is driven rotates the other roll 21 in the reverse direction. In order to achieve this, the other roll 21 is interlocked and connected via a gear (not shown). Of the pair of upper and lower rolls 21, the roll 21 that is driven and rotated may be either upper or lower, and both rolls 21 may be driven individually. Incidentally, the pair of rolls 21 are rotated in directions opposite to each other so that the outer peripheral surfaces of the pair of rolls 21 approach each other on the side facing the material storage portion 3.

And it is comprised so that the material discharge amount by the material rolling part 2 may be controlled by controlling the rotational speed of the roll 21.
In this embodiment, the output of the material rolling section 2 can be switched between two stages by switching the rotation speed of the roll 21 between two stages of a normal speed and a high speed faster than the normal speed.

As shown in FIGS. 1-4, the material extrusion part 1 is equipped with the biaxial taper screw 13 arranged in parallel with the horizontal direction.
The biaxial taper screw 13 is in an inclined posture in which the rotation axis 13a is closer to the tip side (see FIG. 4) and the rotation axis 13a is lower toward the tip side (see FIGS. 1 and 2). Arranged in the casing 14.
The casing 14 is formed in a tapered shape in which the inner space becomes narrower toward the front side, and the extrusion port forming body 12 in which the extrusion port 11 having a curved shape on both the left and right sides is formed at the front end opening. Is attached.
That is, the material extruding part 1 is configured such that the material extruding direction Ds is an obliquely downward direction that becomes lower toward the front.

By controlling the rotational speed of the taper screw 13, the material extrusion amount by the material extruding unit 1 is controlled.
In this embodiment, the output of the material extruding unit 1 can be switched between two stages by switching the rotational speed of the taper screw 13 between a normal speed and a high speed higher than the normal speed. ing.

As shown in FIGS. 1 and 2, the material extruding part 1 and the material rolling part 2 are paired slightly below the imaginary line extending forward along the material extruding direction Ds through the center of the extrusion port 11 in a side view. Are arranged in a relative positional relationship where the gap 21G of the roll 21 is located.
And as shown in FIGS. 1-4, the material storage part 3 is between these material extrusion parts 1 and the material rolling part 2, and the both sides between them are higher than the upper end of the extrusion port 11. It arrange | positions so that it may surround over the range to the position lower than the lower end of the extrusion port 11. FIG.

As shown in FIGS. 1 to 4, between the material extruding part 1 and the material rolling part 2, on both sides of the extrusion port forming body 12, there are the material extruding part 1 and the material rolling part 2 on each side. A side wall 3G is provided so as to close the space, and further, the lower roll 21 of the material rolling part 2 is provided in a state of being in contact with or close to a position below the extrusion port 11 of the extrusion port forming body 12. ing. And the material storage part 3 is formed in the upper open form which has the upper opening part 30 in the upper part by the form partitioned off with the extrusion port formation body 12, the left-right paired side wall part 3G, and a pair of roll 21. FIG.
The upper opening 30 has a rectangular shape surrounded by the extrusion port forming body 12, the left and right side wall portions 3 </ b> G, and the upper roll 21.
As shown in FIGS. 1 to 5, each of the pair of left and right side walls 3 </ b> G that divides the left and right sides of the material storage unit 3 has an extrusion port side portion 31 on the extrusion port 11 side across the shared tangent of the pair of rolls 21. And an inter-roll side portion 32 that enters between the pair of rolls 21 on the roll 21 side.

  As shown in FIG. 3 and FIG. 5, among the inner surfaces 3 </ b> S of the pair of side wall portions 3 </ b> G, at least the left-right distance that is the left-right distance between the inner surfaces 31 </ b> S of the extrusion port side portion 31 is increased toward the lower side. It is configured.

Hereinafter, the pair of side wall portions 3G will be described.
As shown in FIGS. 2-8, the extrusion port side part 31 of each side wall part 3G is a part located between a pair of roll 21 and the extrusion port formation body 12, and the roll side part 32 is Further, it is configured to extend forward from the extrusion port side portion 31 so as to extend between the pair of rolls 21 to the vicinity in front of the gap 21G.
The pair of left and right extrusion port side portions 31 are configured to be plane-symmetric with each other, and FIG. 7 is a diagram showing the right extrusion port side portion 31 of the pair of left and right extrusion port side portions 31, 7A is a left side view, FIG. 7B is a front view, FIG. 7C is a right side view, FIG. 7D is a bottom view, and FIG. 7E is a perspective view as viewed from the upper left front.
Further, the pair of left and right roll-side parts 32 are also configured to be plane-symmetric with each other, and FIG. 8 is a diagram showing the right roll-to-roll side part 32 of the pair of left and right rolls. 8A is a perspective view as viewed from the upper left front, FIG. 8B is a left side view, FIG. 8C is a rear view, FIG. 8D is a plan view, FIG. 8E is a right side view, and FIG. It is the figure seen from the front.

As shown in FIGS. 2, 5, and 7, the extrusion port side portion 31 has a substantially right trapezoidal shape in which the outer shape when viewed in the left-right direction is vertically long and the lower bottom is considerably shorter than the upper bottom. The vertically elongated trapezoidal shaped extrusion port side portion 31 is arranged in a state where the rear surface having substantially right angle corners on both sides is in contact with the left or right side of the extrusion port 11 on the back surface of the extrusion port forming body 12. Established.
The inner surface 31S facing the material storage part 3 in the extrusion port side portion 31 is located on the lower side of the parallel inner surface portion 31a, the lower inner surface portion 31b extending downward, and the parallel inner surface portion 31b. The lower front spreading inner surface portion 31c is connected to the front side of the inner surface portion 31b.

As shown in FIGS. 2, 5, and 7, the parallel inner surface portion 31 a of the inner surface 31 </ b> S of the extrusion port side portion 31 is configured as a surface parallel to both the material extrusion direction Ds and the material pressing direction Dp.
As shown in FIGS. 2, 3, 5, 6, and 7, the lower inner surface portion 31 b of the inner surface 31 </ b> S of the extrusion port side portion 31 is parallel to the material extrusion direction Ds and is lower in the material pressing direction Dp. It is comprised in the inclined surface of the downward spreading shape located in the outer side of the left-right direction, so that the side is.
Further, the inner surface 31b that extends downward from the inner surface 31S of the extrusion port side portion 31 has a bottom that covers substantially the entire width of the inner surface 31S of the extrusion port side portion 31 in a lateral view in the left-right direction, and a vertex that is substantially a right-angle platform. The shaped extrusion port side portion 31 is formed in a vertically long, generally inverted triangular shape located at the rear end of the bottom of the inner surface 31S.

The lower front both-side expanded inner surface portion 31c of the inner surface 31S of the extrusion port side portion 31 is located on the outer side in the left-right direction toward the front side in the material extrusion direction Ds, and the outer side in the left-right direction toward the lower side in the material pressing direction Dp. It is comprised in the inclined surface which spreads toward both the downward direction and the front direction.
Further, the lower front both-side spreading inner surface portion 31c of the inner surface 31S of the extrusion port side portion 31 is located at the front end of the bottom side portion of the inner surface portion 31b having an inverted triangular shape in the lateral direction when viewed from the left and right. The right-angle trapezoid-shaped extrusion port side portion 31 is configured to have a vertically long, generally triangular shape extending over the entire bottom length of the inner surface 31S.

  That is, in this embodiment, in the inner surface 31S of the extrusion port side portion 31, the pair of extrusion port side portions 31 in the entire region below the lower limit position (details will be described later) of the movement range in the vertical direction of the pressing member 41. The left and right intervals between the inner surfaces 31 </ b> S are configured to become wider toward the lower side.

  As shown in FIGS. 2, 3, 5, and 8, the inter-roll side portion 32 has an outline shape when viewed in the left-right direction, and the apex portion is facing forward (the gap 21 </ b> G side of the pair of rolls 21). Isosceles triangle shape. And the end surface part (namely, the end surface part in alignment with the edge corresponding to the base of a substantially isosceles triangle shape) which faces the back (extrusion port 11 side) of the part 32 between rolls is formed in plane, and roll The end surface portions facing each of the pair of rolls 21 in the intermediate portion 32 (that is, the end surface portion along the edge corresponding to the side having the same length sandwiching the apex of the approximately isosceles triangle) are concentric with each roll 21. It is comprised so that it may become the bay entrance surface 32d which enters into a circular arc shape.

  Further, the inner surface 32S facing the inside of the material storage portion 3 in the inter-roll side portion 32 has a portion close to the upper side of the rear end edge and a portion close to the rear side of the lower curved end edge in the left-right direction view. A downwardly extending inner surface portion 32a that is a portion on the rear side of the first line segment that connects the first line segment, the first line segment, a portion near the front of the upper curved edge, and a lower curved edge. It consists of a front expanding inner surface portion 32b which is a portion between the second line segment connecting the portion approaching the front side, and a parallel inner surface portion 32c extending from the second line segment to the front end.

As shown in FIGS. 2, 5, 6, and 8, the lower inner surface portion 32 a of the inner surface 32 </ b> S of the inter-roll side portion 32 is parallel to the material extrusion direction Ds, and the lower side in the material pressing direction Dp. It is comprised by the downwardly-expanding inclined surface located in the outer side of a direction.
The inner surface portion 32b that extends forward of the inner surface of the inter-roll side portion 32 is configured as an inclined surface that extends forward in the left and right direction toward the front side in the material extrusion direction Ds and is parallel to the material pressing direction Dp. ing.
The parallel inner surface portion 32c of the inner surface of the inter-roll side portion 32 is configured as a surface parallel to both the material extrusion direction Ds and the material pressing direction Dp.

As shown in FIG. 7B, in the rear view in the direction parallel to the upper base of the extrusion port side portion 31, the downward expansion of the extrusion port side portion 31 with respect to the surface along the material extrusion direction Ds and the material pressing direction Dp. The inclination angle α of the inner surface portion 31b is, for example, 5 to 15 degrees, and similarly, the front end edge of the inner surface portion 31c extending forward and downward in the extrusion port side portion 31 with respect to the surface along the material extrusion direction Ds and the material pressing direction Dp. Is larger than the inclination angle α of the inner surface portion 31b that extends downward, for example, 10 to 20 degrees.
Moreover, as shown in FIG.8 (f), in the back view in the direction parallel to the upper base of the extrusion opening | mouth side part 31, the side part 32 between rolls with respect to the surface in alignment with the material extrusion direction Ds and the material pressing direction Dp is shown. The inclination angle γ of the downwardly extending inner surface portion 32a is the same as the inclination angle β of the front end edge of the lower front both expanding inner surface portion 31c of the extrusion port side portion 31 with respect to the surface along the material extrusion direction Ds and the material pressing direction Dp. For example, the angle is 10 to 20 degrees.
Further, the length of the rear end edge of the inner surface portion 32a that extends downward in the inter-roll side portion 32 is the same as the length of the front end edge of the inner surface portion 31c that extends downward and forward in the extrusion port side portion 31.

  As shown in FIGS. 2 to 6, the extrusion port side portion 31 and the inter-roll side portion 32 configured as described above are formed between the front end edge of the inner surface portion 31 c and the front end edge of the inner surface portion 31 c. In a state where the rear surface of the extrusion port side portion 31 and the front surface of the inter-roll side portion 32 are in contact with each other so as to match the rear end edge of the inner surface portion 32a that extends downward from the side portion 32, the connecting member 33 integrally The side wall 3G is configured by assembling.

  In this way, when the extrusion port side portion 31 and the inter-roll side portion 32 are integrally assembled by the connecting member 33, the parallel inner surface portion 31a, the downwardly extending inner surface portion 31b, and the lower front both expanding inner surface portion of the extrusion port side portion 31. 31c and the inner surface portion 32a extending downward, the front expanding inner surface portion 32b, and the parallel inner surface portion 32c of the inter-roll side portion 32 are connected in a series, and the inner surface 3S of the side wall portion 3G is constituted by these inner surface portions. (See FIGS. 2 and 4).

  As shown in FIGS. 2 to 6, the side wall portion 3 </ b> G configured by integrally assembling the extrusion port side portion 31 and the inter-roll side portion 32 in this way is the material extrusion portion 1 and the material rolling portion. 2, the inner surface portion 31 b that extends downward from the extrusion port side portion 31 is close to the edge of the extrusion port 11 from the outside in a rear view along the material extrusion direction Ds from the extrusion port 11. It arrange | positions so that it may be in a state (refer FIG. 3).

As shown in FIG. 3, the width Wm in the left-right direction of the extrusion port 11 is determined by the specifications of the sheet forming apparatus, and the left-right distance between the front end portions of the inner surfaces 32S of the pair of inter-roll side portions 32 (the pair of rolls). The left-right distance between the front end portions of the parallel inner surface portion 32c in the intermediate side portion 32) Wf is larger than the width Wm in the left-right direction of the extrusion port 11 and is formed into a sheet shape by the pair of rolls 21. It is determined by the target range in doing.
And as shown in FIG. 3, the left-right space | interval of the upper end parts in each inner surface 31S of a pair of extrusion opening side part 31 (the left-right space | interval of the upper end parts of a pair of downward spreading inner surface part 31b) Wt, and a pair of Each of the left and right intervals between the lower ends of each inner surface 31S of the extrusion port side portion 31 (maximum left and right interval between the front end portions of the lower ends of the pair of lower front both spreading inner surfaces 31c) Wd is the horizontal direction of the extrusion port 11 Are set under the conditions of the following formulas (1) and (2) on the basis of the width Wm and the left-right distance Wf between the front end portions of each inner surface 32S of the pair of inter-roll side portions 32.

Wt <Wm Expression (1)
Wm <Wd <Wf (2)

That is, in this embodiment, in addition to the inner surface 31S of the extrusion port side portion 31 (specifically, the downwardly extending inner surface portion 31b and the lower forward both expanding inner surface portion 31c) of the inner surface 3S of each of the pair of side wall portions 3G. In addition, the left-right distance between the portions (that is, the downwardly extending inner surface portion 32a) connected to the front of the inner surface 31S of the extrusion port side portion 31 in the inner surface 32S of the inter-roll side portion 32 is also configured to become wider toward the lower side. Will be.
Further, the left-right distance Wt between the upper end portions (parallel inner surface portion 31a, that is, the upper end edge of the inner surface portion 31b extending downward) of each inner surface 31S of the pair of extrusion port side portions 31 is the width Wm in the left-right direction of the extrusion port 11. It will be comprised so that it may become narrower.
Further, each inner surface 31S of the pair of extrusion port side portions 31 (specifically, a downwardly extending inner surface portion 31b that is a rear side portion) is configured by an inclined surface that is positioned on the outer side in the left-right direction toward the lower side, The relative positional relationship between the inner surfaces 31S (specifically, the downwardly extending inner surface portion 31b) of each of the pair of extrusion port side portions 31 with respect to the extrusion port 11 is determined in a rear view along the material extrusion direction Ds from the extrusion port 11. It will be comprised so that it may be in the state which adjoins the opening edge of the exit 11 from the outer side.

Moreover, it is comprised so that the left-right space | interval of the inner surfaces 3S in a pair of side wall part 3G may become so wide as it goes to the pair of roll 21 side along the material extrusion direction Ds from the extrusion port 11. FIG.
Furthermore, the left-right distance Wd between the lower ends of the inner surfaces 31S of each of the pair of extrusion port side portions 31 is set to be narrower than the left-right distance Wf of the front end portions of each of the inner surfaces 32S of the pair of inter-roll side portions 32. It will be configured.

As shown in FIGS. 1 and 2, the pressure application unit 4 includes a link 43 that is rotatably supported around a rotation axis 42 that is parallel to the axis 21 a of the roll 21, and an upper end portion of the link 43. By connecting the pressing member 41 with the flat material pressing surface 41a facing downward by the connecting tool 44 and the lower end of the link 43 and rotating the link 43 around the rotation axis 42. And an actuator 45 that moves the pressing member 41 along the downward material pressing direction Dp. Incidentally, the rotation axis 42 of the link 43 is located on the rear side with respect to the extrusion port 11 in the material extrusion direction Ds.
Then, by actuating the actuator 45 in the direction of pulling the lower end portion of the link 43, the pressing member 41 presses the molding material M stored in the material storage portion 3 from above to the downward material pressing direction Dp. Is configured to do.
In this embodiment, the pressing force for pressing the material M to be pressed by the pressing member 41 is configured to be switched between two stages of low pressure and high pressure.
As the actuator 45, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder or the like can be used.

As shown in FIGS. 2 to 4, the pressing member 41 connected to the upper end portion of the link 43 as described above is configured in a rectangular shape when viewed in the thickness direction (corresponding to the material pressing direction Dp). Arranged in the reservoir 3.
And in the material pressing direction Dp view, the outer peripheral part of the pressing member 41 and the upper opening part of the material storage part 3 so that the pressing member 41 can be moved in the material storage part 3 along the material pressing direction Dp. A gap is provided between 30 mouth edges (formed by the extrusion port forming body 12, the side wall portions 3G on both the left and right sides, and the upper roll 21).

By the way, the pressure application unit 4 presses the molding material M stored in the material storage unit 3 by applying a preset pressure in the material pressing direction Dp facing downward from above, so that the material storage unit The position in the material pressing direction Dp on the material pressing surface 41a of the pressing member 41 varies within a predetermined range in accordance with the amount of the molding material M stored in 3.
As shown in FIGS. 2 and 3, the fluctuation range of the position in the material pressing direction Dp on the material pressing surface 41 a of the pressing member 41 is different in each of the pair of extrusion port side portions 31 in the material storage portion 3. It is comprised so that it may become the area | region where both right and left sides may be enclosed by the parallel inner surface part 31a.

As shown in FIG. 1, a position detection sensor T1 for detecting the position of the pressing member 41 (actually, the material pressing surface 41a) in the material pressing direction Dp is provided.
Specifically, the position detection sensor T1 is configured by a rotary encoder that detects a rotation angle of the link 43 with respect to the rotation axis 42 (hereinafter, also referred to as “position-corresponding angle”).
That is, when the position corresponding angle when the pressing member 41 is positioned at the lower limit position of the material pressing direction Dp (generally, the lower edge of the parallel inner surface portion 31a) is 0 degree, the position of the pressing member 41 in the material pressing direction Dp is The higher the position is from the lower limit position, the larger the position-corresponding angle, and the fluctuation of the position-corresponding angle becomes the position fluctuation of the pressing member 41 in the material pressing direction Dp.
Accordingly, a correlation between the detection information of the position detection sensor T1 and the position of the pressing member 41 in the material pressing direction Dp is obtained in advance, and the position corresponding angle is determined by the position detecting sensor T1 in the pressing member 41 in the material pressing direction Dp. The position 41 is detected.

  As shown in FIG. 1, a sheet detection sensor T <b> 2 that detects whether or not a sheet is discharged by detecting the presence or absence of the sheet-like material Ms delivered from the pair of rolls 21 is provided near the exit of the material rolling unit 2. It has been.

Next, based on FIG. 9, it is verified that the flow state of the molding material M in the material reservoir 3 can be improved by configuring the inner surface 3S of the side wall 3G of the material reservoir 3 as in this embodiment. To do.
FIG. 9A is a longitudinal rear view when the inner surface 3S of the side wall 3G of the material reservoir 3 is configured as in the above-described embodiment. 9 (b) shows the left-right distance between the inner surfaces 31S of the extrusion port side portion 31 among the inner surfaces 3S of the side wall 3G of the material storage unit 3 as in the prior art. It is a vertical rear view at the time of comprising so that it may become fixed in the up-down direction on the conditions which become wider than this width | variety.

By the way, in the configuration shown in FIG. 9B, the inner surface 32S of the inter-roll side portion 32 of the side wall portion 3G is connected to the front widening inner surface portion 32f of the rear portion and the front end of the front widening inner surface portion 32f. And a parallel inner surface portion 32g extending up to.
An inner surface portion 32f that extends forward of the inner surface 32S of the inter-roll side portion 32 is configured to be a front-expanding flat surface that is parallel to the material pressing direction Dp and is positioned more outward in the left-right direction toward the front side in the material pushing direction Ds. The parallel inner surface portion 32g of the inner surface 32S of the inter-roll side portion 32 is configured in a plane parallel to both the material extrusion direction Ds and the material pressing direction Dp.

In the configuration shown in FIG. 9A, among the inner surfaces 31S of the extrusion port side portion 31, the inner surfaces 31S of the pair of extrusion port side portions 31 are located in the entire region below the lower limit position of the movement range of the pressing member 41. The left-right distance is configured to increase toward the lower side.
As a result, in filling the material reservoir 3 with the molding material M extruded from the extrusion port 11 to the material reservoir 3, as indicated by the black arrow, it is downward along the inner surface 31 </ b> S of the extrusion port side portion 31. The flow of the molding material M toward it occurs. Thereby, in the rear view of the extrusion port 11, the retention region A of the molding material M is hardly generated in the upper region between the edge of the extrusion port 11 and the inner surface 31 </ b> S of the extrusion port side portion 31. Moreover, since the space | interval between the inner surfaces 31S of a pair of extrusion port side parts 31 becomes wide toward the lower side, and further the flow toward the lower side of the molding material M described above occurs, the outer peripheral surface of the lower roll 21 The molding material M can be brought into contact with a region as wide as possible.

Moreover, in the inner surface 31S of the extrusion port side portion 31, in the lower front both-side spreading inner surface portion 31c of the front end side portion, the left and right intervals between the inner surfaces 31S of the pair of extrusion port side portions 31 are closer to the lower side and forward. Since it is comprised so that it may become so wide as the side, the molding material M can be extended in the left-right direction.
Further, among the inner surfaces 32S of the inter-roll side portion 32, the left and right distances between the inner surfaces 32S of the pair of inter-roll side portions 32 also in the downwardly extending inner surface portion 32a that is a portion connected to the front of the inner surface 31S of the extrusion port side portion 31. Is configured to become wider toward the lower side, so that the molding material M is further encouraged to flow downward, and the area where the molding material M is brought into contact with the outer peripheral surface of the lower roll 21 is increased. It can be further expanded.
Therefore, by these synergistic actions, the molding material M extruded from the extrusion port 11 to the material reservoir 3 is effectively caused to flow toward the lower roll 21 to cause the molding material M to flow downward. It can be made to flow toward the front while spreading in the left-right direction along the outer peripheral surface. As a result, the molding material M can be made to enter the gap 21G between the pair of rolls 21 with the widest lateral width as much as possible, and the width of the sheet-like material Ms is suppressed from being narrowed, and the sheet-like material is reduced. It can suppress that an unevenness | corrugation arises in the edge of Ms.

On the other hand, as shown in FIG. 9B, when the left and right intervals between the inner surfaces 31S of the pair of extrusion port side portions 31 are constant in the vertical direction, the material is stored from the extrusion port 11. The molding material M on the upper side of the molding material M pushed out to the portion 3 spreads in the left-right direction and flows downward as it hits the inner surface 31S of the extrusion port side portion 31 of the side wall portion 3G as indicated by a black arrow. It is hard to do. Accordingly, in the rear view of the extrusion port 11, the molding material M hits the inner surface 31 </ b> S of the extrusion port side portion 31 in the upper region between the edge of the extrusion port 11 and the inner surface of the extrusion port side portion 31. A staying area A staying up to is easily generated, and the staying area A tends to be widened.
When a large staying area A is generated in the material reservoir 3 in this way, the flow of the molding material M is hindered, and the molding material M is located near the inner surface 3S of the side wall 3G in the downstream material reservoir 3. Is hard to be filled. Therefore, the width of the molding material M entering the gap 21G between the pair of rolls 21 is narrowed in the left-right direction or the amount of end portions in the left-right direction is reduced, and the width of the sheet-like material Ms becomes unstable. Thus, irregularities are likely to occur on the edge in the left-right direction of the sheet-like material Ms.

[Another form]
(A) When the inner surfaces 31S of each of the pair of extrusion port side portions 31 are constituted by inclined surfaces positioned on the outer side in the left-right direction toward the lower side, in the above embodiment, the pair of extrusion port sides with respect to the extrusion port 11 The relative positional relationship between the inner surfaces 31S of the portions 31 is configured so as to be close to the mouth edge of the extrusion port 11 from the outside in a rear view along the material extrusion direction Ds from the extrusion port 11. You may comprise so that it may be in the state which touches 11 mouth edges.

(B) Of the inner surface 3S of each of the pair of side wall portions 3G, the configuration of the inner surface 31S of the extrusion port side portion 31 is configured such that the left-right distance between the inner surfaces 31S of the extrusion port side portion 31 increases toward the lower side. Is limited to the form exemplified in the above-described embodiment, that is, the form in which the inner surface 31S of the extrusion port side portion 31 is composed of the parallel inner surface portion 31a, the lower inner surface portion 31b, and the lower front both inner surface portion 31c. is not.
(B-1) For example, the entire surface of the inner surface 31S of the extrusion port side portion 31 is parallel to the material extrusion direction Ds, and is inclined downward in the material pressing direction Dp so as to be positioned on the outer side in the left-right direction toward the lower side. It may be a surface.
(B-2) For example, the entire inner surface 31S of the extrusion port side portion 31 is positioned on the outer side in the left-right direction toward the front side in the material push-out direction Ds, and the lower side in the material pressing direction Dp. It is good also as a one-sided inclined surface of the downward front both spreading shape located in the outer side.
In any of these cases, the left and right intervals between the inner surfaces 31S of the pair of extrusion port side portions 31 are widened toward the lower side over the entire inner surface 31S of each of the extrusion port side portions 31. Will be.
(B-3) For example, the inner surface 31S of the extrusion port side portion 31 may be formed in a plurality of steps in a form in which the lower side in the material pressing direction Dp is positioned on the outer side in the left-right direction.

(C) In addition to the inner surfaces 31S of the pair of extrusion port side portions 31, the left and right distances between the inner surfaces 32S of the pair of inter-roll side portions 32 are configured to become wider toward the lower side, as in the above embodiment. In addition, in a part of the inner surface 32S of the inter-roll side portion 32, the configuration is not limited to the case where the left-right distance between the inner surfaces 32S of the pair of inter-roll side portions 32 is increased toward the lower side.
For example, the entire inner surface 32S of the inter-roll side portion 32 is positioned on the outer side in the left-right direction toward the front side in the material extrusion direction Ds, and positioned on the outer side in the left-right direction toward the lower side in the material pressing direction Dp. Thus, by forming a single inclined surface that spreads in both the downward and forward directions, the left-right distance between the inner surfaces 32S of the pair of inter-roll side portions 32 is closer to the lower side on the entire inner surface 32S of the inter-roll side portion 32. You may comprise so that it may become large.

(D) In the configuration in which the left-right distance between the inner surfaces 3S of the pair of side wall portions 3G increases toward the pair of rolls 21 along the material extrusion direction Ds (that is, forward), As in the embodiment, a pair of the inner surface 31S of the extrusion port side portion 31 (the lower front bifurcated inner surface portion 31c) and the inner surface 32S of the inter-roll side portion 32 (the front wider inner surface portion 32b) are paired. It is not limited to the case where the left and right distances between the inner surfaces 3S of the side wall portion 3G are made wider toward the front along the material extrusion direction Ds.
(D-1) For example, the inner surface 31S of the extrusion port side portion 31 is not provided with a portion where the left-right interval becomes wider toward the front along the material extrusion direction Ds, and a part of the inner surface 32S of the inter-roll side portion 32 The left and right distances between the inner surfaces 3S of the pair of side wall portions 3G may be configured to increase toward the front along the material extrusion direction Ds.
In this case, for example, the entire inner surface 31S of the extrusion port side portion 31 is configured to be parallel to the material extrusion direction Ds, and the inner surface 32S of the inter-roll side portion 32 is configured in the same manner as in the above embodiment. .
(D-2) For example, on the entire inner surface 31S of the inter-roll side portion 32, the inner surface 31S of the extrusion port side portion 31 is not provided with a portion where the left-right interval becomes wider toward the front along the material extrusion direction Ds. You may comprise so that the left-right space | interval of the inner surfaces 3S in a pair of side wall part 3G may become so wide that it is ahead along the material extrusion direction Ds.
In this case, the entire inner surface 31S of the extrusion port side portion 31 is configured to be parallel to the material extrusion direction Ds, and the entire inner surface 32S of the inter-roll side portion 32 is paired along the material extrusion direction Ds. It is set as the one inclined surface of the front spreading shape which becomes so wide as it goes to the roll 21 side.
(D-3) For example, on the entire inner surface 31S of the extrusion port side portion 31 and the entire inner surface 32S of the inter-roll side portion 32, the distance between the inner surfaces 3S in the pair of side wall portions 3G is in the material extrusion direction Ds. You may comprise so that it may become wide along the front along.
In this case, for example, each of the inner surface 31S of the extrusion port side portion 31 and the inner surface 32S of the inter-roll side portion 32 is positioned on the outer side in the left-right direction toward the front side in the material extrusion direction Ds, and the material pressing In the direction Dp, the lower side is defined as an inclined surface with a downwardly spreading front and a lower surface in the lateral direction.

(E) Each of the left-right distance Wd between the lower ends of each inner surface 31S of the pair of extrusion port side portions 31 and the left-right distance Wf between the front end portions of each inner surface 32S of the pair of inter-roll side portions 32 is If the width of the outlet 11 in the left-right direction is Wm, it can be set as appropriate under the condition of Wm <Wd ≦ Wf.

(G) In the above embodiment, the side wall 3G of the material storage unit 3 is configured by the extrusion port side part 31 and the inter-roll side part 32 which are separate from each other. You may comprise by the member of.

(H) Even if the material storage unit 3 is configured to have an upper opening having an upper opening 30 at the top, the pressure application unit 4 as in the above embodiment is omitted, and the pushing force from the material extrusion unit 1 The molding material M may be configured to enter between the pair of rolls 21 by gravity.
Or the material storage part 3 is comprised in the state closed over the peripheries of the upper, lower, left, and right side peripheral parts, and the molding material stored in the material storage part 3 by the pushing force from the material extrusion part 1 You may comprise so that a pressure may be applied to M.

By the way, according to the sheet forming apparatus of the above embodiment, the following effects can be expected.
In the rear view of the extrusion port 11, a conventional retention region of the molding material is hardly generated in the upper region between the edge of the extrusion port 11 and the inner surface of the extrusion port side portion 31.
Further, since the width in the left-right direction of the material storage portion 3 becomes wider toward the lower side and further the flow toward the lower side of the molding material M described above is generated, the area covered as wide as possible on the outer peripheral surface of the lower roll 21 is covered. The molding material M can be brought into contact.
That is, since the molding material M extruded from the extrusion port 11 to the material reservoir 3 effectively flows toward the lower roll 21 and spreads in the left-right direction along the outer peripheral surface of the lower roll 21. The molding material M enters the gap between the pair of rolls 21 in a state where the variation in the width in the left-right direction is suppressed. Thereby, it is suppressed that a sheet | seat width becomes narrow and it is suppressed that an unevenness | corrugation arises in the edge of a sheet-like material.
Therefore, it is possible to provide a sheet forming apparatus that can improve the yield in sheet forming.

  However, also with this sheet forming apparatus, the inner surface 31S facing the inside of the material reservoir 3 in the periphery of the extrusion port 11 on the back side of the extrusion port forming body 12 where the extrusion port 11 is formed, and the extrusion port side portion 31, the pressing member The part surrounded by 41 becomes a space (dead space) in which the pushing force by the biaxial taper screw 13 of the material extruding part 1 is difficult to be transmitted, the flow of the molding material M becomes worse, and a staying area is likely to occur. There was a problem that it was not possible to completely suppress the occurrence of irregularities and notches on the edge of the sheet-like material.

  In addition, this sheet forming apparatus is provided with a parallel inner surface portion 32c in which the opposed inner surfaces are parallel to each other in plan view at the distal end portion on the roll 21 side of the inter-roll side portion 32 of the pair of side wall portions 3G. The target width for forming the material M into a sheet shape is defined, but the molding material M that has entered the gap between the side surface of the parallel inner surface portion 32c and the roll 21 has a shape of the parallel inner surface portion 32c. There was a problem in that it was rolled as it was without being discharged for the reason, and it protruded to the edge of the sheet-like material, resulting in intermittent protrusions.

In this way, when irregularities and cutouts occur on the edge of the sheet-like material, the sheet width of the sheet-like material may be narrower than the target sheet width and may be treated as defective, and the generated edge If the concave portion is deep, the sheet-like material may be cracked and the sheet-like material may be cut, so that the yield tends to decrease, and there is room for further improvement in improving the yield in sheet molding of the molding material M. there were.
In addition, when a protrusion is generated at the edge of the sheet-like material, the protrusion is a sheet in the buffer 60 or the like including a conveyor device that conveys the sheet-like material to the sheet material processing device 70 that is a rear device of the sheet forming apparatus. There is a problem in that the yield is reduced because the material is missing from the shaped material, and the productivity is lowered because it takes manpower and time to clean the missing material.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a sheet forming apparatus that can further improve the yield in sheet forming.

  In order to achieve the above object, a sheet forming apparatus according to the present invention receives a material extrusion portion for extruding a molding material forward from an extrusion port, and a molding material extruded from the material extrusion portion. The sheet forming is provided with a material rolling part that is molded and discharged and a material storage part that temporarily stores the molding material extruded from the material extrusion part between the material extrusion part and the material rolling part In the apparatus, the pair of side wall portions that define both the left and right sides of the material storage portion include an extrusion port side portion on the extrusion port side and a roll-to-roll side portion on the roll side across the shared tangent line of the pair of rolls. It is comprised, The inner surface of the said extrusion port side part is formed in the curved surface shape which followed the curved shape of the extrusion port among the inner surfaces of a pair of said side wall part, It is characterized by the above-mentioned.

  In this case, the inner surface of the portion between the rolls of the pair of side wall portions can be formed in a curved shape that is continuous with the inner surface of the extrusion port side portion.

  In addition, a parallel inner surface portion in which the opposed inner surfaces are parallel to each other in plan view is provided at the end of the pair of side wall portions between the rolls in the roll side, and the parallel inner surface portion in the extrusion direction of the molding material is provided. The length can be set to 15% or less of the diameter of the roll.

  Further, among the inner surfaces of the pair of side wall portions, at least the left-right distance, which is the distance between the inner surfaces of the extrusion port side portions, in the left-right direction can be configured to increase toward the lower side.

  Further, the material reservoir is configured so that an upper portion is opened, and a pressure applying unit that applies pressure by pressing a pressing member from above on the molding material stored in the material reservoir. It can be provided.

  According to the sheet forming apparatus of the present invention, the pair of side wall portions defining the left and right sides of the material storage portion are formed on the extrusion port side of the extrusion port side across the shared tangent of the pair of rolls, and the roll on the roll side. An inner side portion, and among the inner surfaces of the pair of side wall portions, at least the inner surface of the extrusion port side portion is formed in a curved shape following the curved shape of the extrusion port. , Can reduce the space (dead space) where the pushing force by the material extruding part on the back side of the extrusion port forming body where the extrusion port is formed is difficult to be transmitted, and the flow of the molding material becomes worse, or the retention area is generated It is possible to prevent the sheet from being easily formed, to suppress the occurrence of unevenness and notches at the edge of the sheet material, and to improve the yield in sheet forming.

  In addition, the inner surface of the pair of side wall portions between the rolls is formed in a curved shape that is continuous with the inner surface of the extrusion port side portion, whereby the inner surface of the extrusion port side portion of the side wall portion and the roll Ensuring continuity with the inner surface of the intermediate portion, more reliably preventing the flow of the molding material from becoming worse and the possibility of stagnant areas to occur, causing irregularities and notches on the edge of the sheet-like material This can be suppressed and the yield in sheet forming can be improved.

  In addition, a parallel inner surface portion in which the opposed inner surfaces are parallel to each other in plan view is provided at the end of the pair of side wall portions between the rolls in the roll side, and the parallel inner surface portion in the extrusion direction of the molding material is provided. By setting the length to be 15% or less of the diameter of the roll, the distance that the molding material enters the gap between the side surface of the parallel inner surface portion and the roll can be shortened. The amount of intrusion can be reduced, the material to be molded can be prevented from protruding to the edge of the sheet-like material, and intermittent projections can be suppressed, and the yield and productivity in sheet molding can be improved.

In addition, among the inner surfaces of the pair of side wall portions, at least the left and right intervals, which are the intervals in the left and right direction between the inner surfaces of the extrusion port side portions, are configured to become wider toward the lower side. Since the width in the left-right direction of the material storage portion at the outlet side portion becomes wider toward the lower side, when filling the material storage portion with the molding material extruded from the extrusion port to the material storage portion, along the inner surface of the extrusion port side portion. As a result, the molding material flows downward. Thereby, in the back view of the extrusion port, a staying area of the molding material is hardly generated in the upper region between the edge of the extrusion port and the inner surface of the extrusion port side portion.
In addition, since the width of the material storage portion in the left-right direction becomes wider toward the lower side and the flow toward the lower side of the molding material described above is generated, the molding material is placed in a region as wide as possible on the outer peripheral surface of the lower roll. Can be contacted.
In other words, the molding material extruded from the extrusion port to the material storage portion effectively flows toward the lower roll and spreads in the left-right direction along the outer peripheral surface of the lower roll. With the variation suppressed, the molding material enters the gap between the pair of rolls. Thereby, it can suppress that a sheet | seat width becomes narrow, it can suppress that an unevenness | corrugation arises in the edge of a sheet-like material, and can improve the yield in sheet forming.

Further, the material reservoir is configured so that an upper portion is opened, and a pressure applying unit that applies pressure by pressing a pressing member from above on the molding material stored in the material reservoir. By being provided, it can avoid that a material storage part will be in an overpressure state. Thereby, the to-be-molded material which flows in the material storage part can be favorably spread in the left-right direction.
The pressing member presses the material to be molded in the storage portion from above in the vicinity of the central portion in the left-right direction, so that the material to be molded can flow in the storage portion while effectively spreading in the left-right direction. .
Therefore, since the material to be molded can enter the gap between the pair of rolls in a state in which the variation in the width in the left-right direction is suppressed, the yield in sheet forming can be further improved.

It is a left view which shows the whole structure of one Embodiment of the sheet forming apparatus of prior application invention. It is a vertical left side view which shows a pressure application part, a material storage part, and a material rolling part. It is a vertical rear view which shows a material storage part. It is a cross-sectional top view which shows a material storage part. It is a perspective view which shows a material storage part. It is sectional drawing in the VI-VI direction of FIG. It is a figure which shows the extrusion port side part of a side wall part. It is a figure which shows the side part between rolls of a side wall part. It is a vertical back view of the material storage part for demonstrating the flow state of the to-be-molded material in a material storage part. It is a perspective view of the material storage part of one Embodiment of the sheet forming apparatus of prior invention. It is a perspective view of the material storage part of one Embodiment of the sheet forming apparatus of this invention. It is a vertical back view of the material storage part of one Embodiment of the sheet forming apparatus of prior application invention. It is a vertical back view of the material storage part of one Embodiment of the sheet forming apparatus of this invention. It is an expansion perspective view of the material storage part of one Embodiment of the sheet forming apparatus of prior invention. It is an expansion perspective view of the material storage part of one Embodiment of the sheet forming apparatus of this invention. The material storage part of one Embodiment of the prior application invention and the sheet forming apparatus of this invention is shown, (a) is a cross-sectional top view, (b) is a longitudinal rear view, (c) is a longitudinal right side view. It is the photograph which image | photographed the sheet-like material shape | molded by prior invention invention and the sheet forming apparatus of this invention from diagonally upward.

  Hereinafter, an embodiment of the sheet forming apparatus of the present invention will be described based on the drawings while comparing with the sheet forming apparatus of the prior invention.

  10-1, FIG. 11-1 and FIG. 12-1, FIG. 13 (a) and FIG. 13 (b) and FIG. 14, the left half of FIG. FIGS. 11-2 and 12-2, FIGS. 13A and 13B, and the right half of FIG. 14 show an embodiment of the sheet forming apparatus of the present invention corresponding thereto.

In the sheet forming apparatus according to the invention of the prior application, the pair of side wall portions 3G that divide the left and right sides of the material storage portion 3 are arranged so that the extrusion port side portion 31 on the extrusion port 11 side and the roll sandwich the common tangent line of the pair of rolls 21. The inner surface portion 31b of the inner surface 3S of the extrusion port side portion 31 among the inner surfaces 3S of the pair of side wall portions 3G has a planar shape. Is formed.
On the other hand, in the sheet forming apparatus of the present invention, the inner surface portion 31b is formed in a curved shape that follows the curved shape of the extrusion port 11, that is, the curved shape of the left and right sides of the rectangular shape of the extrusion port 11.
Here, “following the curved shape of the left and right sides of the rectangle of the extrusion port 11” means that the inner surface portion 31 b is formed so as to be continuous with the curved opening edges of the left and right sides of the rectangle of the extrusion port 11. means.
This curved surface shape is formed in a conical surface shape in which the volume of the extrusion port side portion 31 gradually increases toward the roll 21 side.
Accordingly, the sheet forming apparatus of the present invention is capable of pushing force by the material extruding portion 1 (specifically, the taper screw 13) on the back side (roll 21 side) of the extrusion port forming body 12 in which the extrusion port 11 is formed. A space (dead space) that is difficult to be transmitted can be reduced, and the flow of the molding material M is prevented from being deteriorated and a staying area is not easily generated, and irregularities and notches are generated at the edge of the sheet-like material S. This can be suppressed and the yield in sheet forming can be improved.

Moreover, in the sheet forming apparatus of the prior invention, the front spreading inner surface portion 32b of the inner surface 32S of the inter-roll side portion 32 of the pair of side wall portions 3G is formed in a planar shape.
On the other hand, in the sheet forming apparatus of the present invention, the inner surface portion 32 b is formed in a curved shape that is continuous with the inner surface portion 31 b of the extrusion port side portion 31.
Here, the inner surface portion 32a and the parallel inner surface portion 32c of the inner surface 32S of the inter-roll side portion 32 other than the inner surface portion 31b are also formed so as to be smoothly continuous with the adjacent inner surface portion 31b and the inner surface portion 32b.
Thereby, the sheet forming apparatus of the present invention ensures continuity between the inner surface 31S of the extrusion port side portion 31 and the inner surface 32S of the inter-roll side portion 32 of the side wall 3G, and the flow of the molding material M becomes worse. Thus, it is possible to more reliably prevent the staying area from being easily generated, suppress the occurrence of unevenness and notches at the edge of the sheet-like material S, and improve the yield in sheet forming.

Moreover, as shown in FIG. 13, in the sheet forming apparatus according to the invention of the prior application, the inner surfaces facing each other are parallel to each other at the distal end portion on the roll 21 side of the inter-roll side portion 32 of the pair of side wall portions 3G. A parallel inner surface portion 32 c is provided, and the length L 0 in the extrusion direction of the molding material M of the parallel inner surface portion 32 c is set to 20 to 25% of the diameter D of the roll 21.
On the other hand, in the sheet forming apparatus of the present invention, the length L1 in the extrusion direction of the molding material M of the parallel inner surface portion 32c is shorter than L1 of the sheet forming apparatus of the prior invention by L ′ (FIG. 13 (a) and 13 (c) indicate a cut portion.), So that the diameter D of the roll 21 is set to 15% or less, preferably 3 to 10%, more preferably 5 to 7%. I am doing so.
Thus, the sheet molding apparatus of the present invention can shorten the distance that the molding material M enters the gap between the side surface of the parallel inner surface portion 32c and the roll 21, thereby reducing the penetration amount of the molding material M. As shown in FIG. 14, the molding material M can be prevented from protruding to the edge of the sheet-like material S and the intermittent projection St is generated, and the yield in sheet molding can be improved.

  The other configurations and operations of the sheet forming apparatus of the present invention are the same as those of the sheet forming apparatus of the prior application, but the configuration of the sheet forming apparatus of the present invention is other than the sheet forming apparatus of the prior application. The sheet forming apparatus that has been widely used in the past, for example, among the inner surfaces of the pair of side wall portions, the sheet forming apparatus configured such that the left-right spacing between the inner surfaces of the extrusion port side portions is constant in the vertical direction, The semi-open bank type provided with the pressing member 41 (here, the sheet forming apparatus (open bank type) configured to open the upper portion of the material storage portion 3 is positioned above the material storage portion 3 by the pressing member 41. The sheet forming apparatus configured to apply a pressure to the molding material M stored in the material storage unit 3 is called a “semi-open bank type”. Forming apparatus, for example, it can be applied to the closed bank type sheet forming device configured as above open bank type and material reservoir is enclosed space, but does not exclude it.

  As described above, the sheet forming apparatus of the present invention has been described based on the embodiments thereof, but the present invention is not limited to the configurations described in the above examples, and the configuration is appropriately changed without departing from the spirit of the present invention. Is something that can be done.

  Since the sheet forming apparatus of the present invention has the characteristic that the yield in sheet forming can be improved, it is suitable for use in various sheet forming apparatuses of open bank type, semi-open bank type and closed bank type. Can be used.

DESCRIPTION OF SYMBOLS 1 Material extrusion part 2 Material rolling part 3 Material storage part 3G Side wall part 3S Inner surface 4 Pressure application part 11 Extrusion port 21 Roll 21a Axis 31 Extrusion port side part 31S Inner surface 32 Inter-roll side part 32S Inner surface 41 Press member Ds Material extrusion direction (Extrusion direction of molding material)
M Molding material Wd Left-right distance between the lower ends of each inner surface of the pair of extrusion side portions Wf Left-right distance between front end portions of each inner surface of the pair of roll-side portions Wm Width of the extrusion port in the left-right direction Wt Left and right spacing between the upper ends of the inner surfaces of the extrusion port side portions

Claims (5)

  A material extruding unit for extruding a molding material forward from an extrusion port; a material rolling unit for receiving the molding material extruded from the material extruding unit; In the sheet forming apparatus provided with a material storage part for temporarily storing the molding material extruded from the material extruding part between the material rolling part and the material rolling part, The side wall portion includes an extrusion port side portion on the extrusion port side across the shared tangent of the pair of rolls, and an inter-roll side portion on the roll side, and at least the inner surface of the pair of side wall portions, An inner surface of the extrusion port side portion is formed into a curved surface shape following the curved shape of the extrusion port.   The sheet forming apparatus according to claim 1, wherein inner surfaces of the pair of side wall portions between the rolls are formed in a curved shape that is continuous with the inner surface of the extrusion port side portion.   A parallel inner surface portion in which the opposed inner surfaces are parallel to each other in plan view is provided at the front end of the pair of side wall portions between the rolls, and the length of the parallel inner surface portion in the extrusion direction of the molding material. Is set to be 15% or less of the diameter of the roll.   The left-right distance which is the distance of the horizontal direction of the inner surfaces of the said extrusion port side part at least among the inner surfaces of a pair of said side wall part is comprised so that it may become so wide toward the lower side, Claim 1 characterized by the above-mentioned. The sheet forming apparatus according to 2 or 3.   The material reservoir is configured so that an upper portion is opened, and a pressure application unit is provided that applies pressure to the molding material stored in the material reservoir by pressing a pressing member from above. 5. The sheet forming apparatus according to claim 1, 2, 3 or 4.

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