WO2022176866A1 - シートモールディングコンパウンドの製造方法、炭素繊維マット堆積装置およびシートモールディングコンパウンド製造装置 - Google Patents

シートモールディングコンパウンドの製造方法、炭素繊維マット堆積装置およびシートモールディングコンパウンド製造装置 Download PDF

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Publication number
WO2022176866A1
WO2022176866A1 PCT/JP2022/006032 JP2022006032W WO2022176866A1 WO 2022176866 A1 WO2022176866 A1 WO 2022176866A1 JP 2022006032 W JP2022006032 W JP 2022006032W WO 2022176866 A1 WO2022176866 A1 WO 2022176866A1
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WO
WIPO (PCT)
Prior art keywords
vertical plane
carbon fiber
pin roll
roll
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/006032
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English (en)
French (fr)
Japanese (ja)
Inventor
健太郎 小田
康 渡邊
禎雄 鮫島
由貴廣 水鳥
惇二 金羽木
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Mitsubishi Chemical Corp
Original Assignee
Mitsubishi Chemical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Chemical Corp filed Critical Mitsubishi Chemical Corp
Priority to EP25154355.9A priority Critical patent/EP4545265A1/en
Priority to JP2023500864A priority patent/JP7597199B2/ja
Priority to CN202280013745.4A priority patent/CN116917099A/zh
Priority to EP22756184.2A priority patent/EP4296027A4/en
Publication of WO2022176866A1 publication Critical patent/WO2022176866A1/ja
Priority to US18/231,701 priority patent/US20230390967A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
    • B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
    • B29B15/10—Coating or impregnating independently of the moulding or shaping step
    • B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
    • B29B15/122—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/18—Separating or spreading
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4242—Carbon fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B29K2105/128—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles in the form of a mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2307/00—Use of elements other than metals as reinforcement
    • B29K2307/04—Carbon
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/02—Reinforcing materials; Prepregs

Definitions

  • the present invention mainly relates to a method for producing a sheet molding compound (SMC), and more particularly to a method for producing an SMC using carbon fibers as reinforcing fibers (CF-SMC).
  • SMC sheet molding compound
  • CF-SMC carbon fibers as reinforcing fibers
  • the present invention also relates to a carbon fiber mat depositing apparatus that can be suitably used for manufacturing CF-SMC, and an SMC manufacturing apparatus including the same.
  • Carbon fiber reinforced plastic is a lightweight material with excellent mechanical properties suitable for parts of automobiles, ships, railway vehicles, manned aircraft, unmanned aircraft and other transportation equipment, and its importance has been increasing in recent years. It's becoming In order to improve the production efficiency of CFRP products, an intermediate material, that is, a carbon fiber prepreg, is being developed in which a reinforcing material made of carbon fiber is previously impregnated with a matrix resin.
  • CF-SMC is a kind of carbon fiber prepreg, and in its manufacturing process, a chopped carbon fiber bundle produced by supplying a continuous carbon fiber bundle to a chopper and cutting it into A carbon fiber mat is formed. Techniques for depositing a carbon fiber mat having a uniform fiber basis weight on a running carrier film have been studied (Patent Documents 1 and 2).
  • a main object of the present invention is to provide a technique useful for producing CF-SMC with improved uniformity of fiber basis weight. Problems that can be solved by each embodiment of the present invention may be disclosed explicitly or implicitly in this specification.
  • Preferred embodiments of the invention include, but are not limited to: [1] (i) Pull out the carrier film from the roll and run it so that its width direction is kept horizontal, (ii) T direction is horizontal and perpendicular to the running direction of the carrier film. Then, a plurality of continuous carbon fiber bundles are arranged in parallel and supplied to a chopper equipped with a cutter roll having a rotation axis parallel to the T direction, and each of them is cut by the chopper to a predetermined length within the range of 5 mm to 60 mm.
  • the chopped carbon fiber bundle produced by the cutting is fragmented by the following fragmentation processing apparatus A arranged under the chopper, and then dropped onto the carrier film to make the carbon fibers depositing a mat; (iv) impregnating said carbon fiber mat with a thermosetting resin composition; and (v) placing a lower partition perpendicular to the T direction below said fragmentation processor;
  • a method for producing a sheet molding compound comprising: The fragmentation processing apparatus A has a first pin roll and a second pin roll each having a rotation axis parallel to the T direction, arranged in a direction orthogonal to the T direction.
  • said first pin roll is rotationally driven such that the pins on the side facing said second pin roll move from top to bottom, and said second pin roll is driven such that the pins move from top to bottom on the side facing said first pin roll;
  • a fragmentation processor that is rotationally driven to move toward.
  • the fragmentation treatment reduces the number of chopped carbon fiber bundles having a number of filaments greater than ⁇ (N/n)+0.5 ⁇ K contained in the unit weight of the carbon fiber mat, [1] to [5]. ]
  • the distance from the peripheral surface of the cylinder of the first pin roll is greater than the length of the pin of the first pin roll, and The manufacturing method according to any one of [1] to [7], wherein the distance from the peripheral surface of the cylinder of the two pin rolls is greater than the length of the pins of the second pin roll.
  • the manufacturing method according to [8] At least between the vertical plane containing the rotation axis of the first pin roll and the vertical plane containing the rotation axis of the second pin roll, at any part of the upper edge of the lower partition, the following first condition and at least one of the second condition is satisfied, the manufacturing method according to [8].
  • First condition the distance from the peripheral surface of the cylinder of the first pin roll is less than the length of the pin of the first pin roll plus 3 cm.
  • Second condition the distance from the peripheral surface of the cylinder of the second pin roll is less than the length of the pin of the second pin roll plus 3 cm.
  • All of the lower partitions are arranged inside an enclosure, and the enclosure consists of two side walls each parallel to the running direction of the carrier film, and a front wall and a rear wall each parallel to the T direction, The manufacturing method according to any one of [1] to [14]. [16] The manufacturing method according to [15], wherein at least part of the enclosure is corrugated so that a horizontal cross section thereof has a corrugated shape. [17] All of the lower partitions are arranged between two side covers, each of which is parallel to the running direction of the carrier film, and the width of the carbon fiber mat in the T direction. is regulated by the two side covers.
  • the distance from the peripheral surface of the cylinder of the first pin roll is greater than the length of the pin of the first pin roll, and the cylinder of the second pin roll.
  • the carbon fiber mat depositing apparatus according to any one of [26] to [29], wherein the distance from the peripheral surface of the second pin roll is greater than the length of the pin of the second pin roll.
  • First condition the distance from the peripheral surface of the cylinder of the first pin roll is less than the length of the pin of the first pin roll plus 3 cm.
  • Second condition the distance from the peripheral surface of the cylinder of the second pin roll is less than the length of the pin of the second pin roll plus 3 cm.
  • the carbon fiber mat depositing apparatus according to any one of [26] to [36], which intersects both the vertical plane containing the second pin roll and the vertical plane containing the rotation axis of the second pin roll.
  • the carbon fiber mat depositing device according to any one of [26] to [37], wherein an upper partition perpendicular to the T-direction is arranged between the chopper and the fragmenting device.
  • the distance from the peripheral surface of the cylinder of the first pin roll is greater than the length of the pin of the first pin roll, and the cylinder of the second pin roll
  • the following third condition and the fourth condition are satisfied.
  • the distance from the peripheral surface of the cylinder of the second pin roll is less than the length of the pin of the second pin roll plus 3 cm.
  • a sheet molding compound manufacturing apparatus comprising the carbon fiber mat depositing apparatus according to any one of [26] to [43].
  • the sheet molding compound manufacturing apparatus according to [44] further comprising two coaters, a mechanism for laminating two carrier films, and an impregnator.
  • the fragmentation processing device has a first pin roll and a second pin roll, each having a rotation axis parallel to the T direction, arranged in a direction orthogonal to the T direction, and the partition includes the The manufacturing method according to [46] or [47], which has a portion sandwiched between a vertical plane containing the rotation axis of the first pin roll and a vertical plane containing the rotation axis of the second pin roll.
  • the fragmentation processing device comprises only one pin roll having a rotation axis parallel to the T direction, and the partition has a portion sandwiched between a first vertical plane and a second vertical plane, [46 ] or the manufacturing method as described in [47].
  • the fragmentation processing device comprises basket rolls having a rotation axis parallel to the T direction, and the partition has a portion sandwiched between a third vertical plane and a fourth vertical plane, [46] Or the production method according to [47].
  • the vertical plane containing the rotation axis of the basket roll is located between the third vertical plane and the fourth vertical plane, and the distance from the vertical plane containing the rotation axis of the basket roll to the third vertical plane
  • the third and fourth vertical planes are defined such that the distance to the fourth vertical plane is both twice the maximum radius of the basket roll.
  • the fragmentation processing device has a first pin roll and a second pin roll arranged in a direction perpendicular to the T direction, each having a rotation axis parallel to the T direction, and the partition is arranged in a direction perpendicular to the T direction. Having a portion sandwiched between a vertical plane containing the rotation axis of one pin roll and a vertical plane containing the rotation axis of the second pin roll, The manufacturing method according to any one of [53] to [55]. [58] The production method according to [57], wherein the following formula (1) is satisfied.
  • d12 is the distance between the rotation axes of the first pin roll and the second pin roll
  • LF is the fiber length of the chopped carbon fiber bundle
  • a is preferably 1, more preferably 2 is.
  • the fragmentation processing device comprises only one pin roll having a rotation axis parallel to the T direction, and the partition has a portion sandwiched between a first vertical plane and a second vertical plane, [53] The production method according to any one of to [55].
  • the vertical plane containing the rotation axis of the pin roll is located between the first vertical plane and the second vertical plane, and the distance from the vertical plane containing the rotation axis of the pin roll to the first vertical plane and the first vertical plane
  • the first vertical plane and the second vertical plane are defined such that the distances to the two vertical planes are both twice the maximum radius of the pin roll.
  • the fragmentation processing device comprises a cage roll having a rotation axis parallel to the T direction, and the partition has a portion sandwiched between a third vertical plane and a fourth vertical plane, [53]- The production method according to any one of [55].
  • the vertical plane containing the rotation axis of the basket roll is located between the third vertical plane and the fourth vertical plane, and the distance from the vertical plane containing the rotation axis of the basket roll to the third vertical plane
  • the third vertical plane and the fourth vertical plane are defined such that the distance to the fourth vertical plane is both twice the maximum radius of the basket roll.
  • All of the partitions are arranged between two side covers, each of the two side covers is parallel to the running direction of the carrier film, and the width of the carbon fiber mat in the T direction is The manufacturing method according to any one of [46] to [63], which is regulated by the two side covers. [66] The production method according to any one of [46] to [65], wherein the content of carbon fiber bundles having a filament number exceeding 0.5K in the carbon fiber mat is 99% by weight or more.
  • Each of the plurality of continuous carbon fiber bundles consists of N filaments and is partially split into n sub-bundles in advance, and the chopped carbon fiber bundles are The fragmentation treatment reduces the number of chopped carbon fiber bundles having a number of filaments greater than ⁇ (N/n)+0.5 ⁇ K contained in the unit weight of the carbon fiber mat, [46] to [66]. ]
  • a resin paste made of a thermosetting resin composition is applied to the upper surface of the carrier film, and after depositing the carbon fiber mat, heat is applied.
  • Another carrier film coated on one side with another resin paste made of a curable resin composition is superimposed on the upper surface side of the carrier film to form a laminate, and the laminate is further pressed, [46] to [ 67].
  • a travel path for a carrier film, a chopper arranged on the travel path, a fragmentation device arranged between the chopper and the travel path, and the fragmentation device and the travel path A partition that divides the space between the wherein said partition is at least partially corrugated to have a corrugated horizontal cross-section.
  • the fragmentation processing device comprises a pin roll or basket roll, and the pin roll or basket roll has a rotation axis parallel to the T direction.
  • the fragmentation processing device has a first pin roll and a second pin roll, each having a rotation axis parallel to the T direction, arranged in a direction orthogonal to the T direction, and the partition includes the The carbon fiber mat depositing apparatus according to [69] or [70], which has a portion sandwiched between a vertical plane containing the rotation axis of the first pin roll and a vertical plane containing the rotation axis of the second pin roll.
  • the fragmentation processing device comprises only one pin roll having a rotation axis parallel to the T direction, and the partition has a portion sandwiched between a first vertical plane and a second vertical plane, [69 ] or the carbon fiber mat depositing apparatus according to [70].
  • the fragmentation processing device comprises basket rolls having an axis of rotation parallel to the T direction, and the partition has a portion sandwiched between a third vertical plane and a fourth vertical plane, [69] Or the carbon fiber mat depositing apparatus according to [70].
  • the vertical plane containing the rotation axis of the basket roll is located between the third vertical plane and the fourth vertical plane, and the distance from the vertical plane containing the rotation axis of the basket roll to the third vertical plane
  • the third and fourth vertical planes are defined such that the distance to the fourth vertical plane is both twice the maximum radius of the basket roll.
  • a travel path for a carrier film, a chopper arranged on the travel path, a fragmentation device arranged between the chopper and the travel path, and the fragmentation device and the travel path A partition that divides the space between the wherein the normal of at least a portion of said partition is inclined from the T direction in the horizontal plane.
  • the carbon fiber mat depositing apparatus according to [76] wherein the inclination angle is 1° or more, 5° or more, 10° or more, 15° or more, or 20° or more.
  • the fragmentation processing device has a first pin roll and a second pin roll arranged in a direction perpendicular to the T direction and each having a rotation axis parallel to the T direction, and the partition is arranged in a direction perpendicular to the T direction.
  • the vertical plane containing the rotation axis of the pin roll is located between the first vertical plane and the second vertical plane, and the distance from the vertical plane containing the rotation axis of the pin roll to the first vertical plane and the first vertical plane
  • the first vertical plane and the second vertical plane are defined such that the distances to the two vertical planes are both twice the maximum radius of the pin roll.
  • the fragmentation device comprises basket rolls having a rotation axis parallel to the T direction, and the partition has at least a portion sandwiched between a third vertical plane and a fourth vertical plane, [76]
  • the carbon fiber mat depositing device according to any one of [78]. However, the vertical plane containing the rotation axis of the basket roll is located between the third vertical plane and the fourth vertical plane, and the distance from the vertical plane containing the rotation axis of the basket roll to the third vertical plane The third vertical plane and the fourth vertical plane are defined such that the distance to the fourth vertical plane is both twice the maximum radius of the basket roll.
  • the carbon fiber mat depositing apparatus according to [84], wherein the following formula (3) is satisfied.
  • D34 is the distance between the third vertical plane and the fourth vertical plane
  • LF is the fiber length of the chopped carbon fiber bundle produced when the continuous carbon fiber bundle is cut by the chopper.
  • a is preferably 1, more preferably 2.
  • a sheet molding compound manufacturing apparatus comprising the carbon fiber mat depositing apparatus according to any one of [69] to [88].
  • the sheet molding compound manufacturing apparatus according to [89] further comprising two coaters, a mechanism for laminating two carrier films, and an impregnator.
  • a technique useful for producing CF-SMC with improved uniformity of fiber basis weight is provided.
  • FIG. 1 is a plan view showing a continuous carbon fiber bundle partially split into five.
  • FIG. 2 is a cross-sectional view showing a continuous carbon fiber bundle partially split into five.
  • FIG. 3 is a schematic diagram of an SMC manufacturing apparatus.
  • FIG. 4 is a schematic diagram of a chopper.
  • FIG. 5 is a schematic diagram of a fragmentation processing device.
  • FIG. 6 is a schematic diagram of a pin roll provided in the fragmentation processing apparatus.
  • FIG. 7 shows a part of the peripheral surface of the pin roll developed on a plane.
  • FIG. 8 is a schematic diagram showing the positional relationship and the like of two pin rolls provided in the fragmentation processing apparatus.
  • FIG. 9 is a schematic diagram for explaining the action of the lower partition. In each of FIGS.
  • FIG. 10 shows the positional relationship among the fragmentation processor, the first carrier film and the lower partition.
  • FIG. 11 is a plan view showing a plurality of lower partitions perpendicular to the T direction arranged along the T direction.
  • FIG. 12 is a plan view showing a plurality of lower partitions perpendicular to the T direction arranged along the T direction.
  • Figure 13 shows how the lower partition is placed inside the enclosure.
  • FIG. 14 shows the positional relationship among the chopper, the fragmentation processor, the first carrier film, the lower partition and the upper partition.
  • FIG. 15 is a schematic diagram of a comb.
  • FIG. 16 is a histogram showing the filament number distribution of chopped carbon fiber bundles in a carbon fiber mat.
  • FIG. 17 is a histogram showing the filament number distribution of chopped carbon fiber bundles in a carbon fiber mat.
  • FIG. 18 is a histogram showing the filament number distribution of chopped carbon fiber bundles in the carbon fiber mat.
  • FIG. 19 is a histogram showing the filament number distribution of chopped carbon fiber bundles in a carbon fiber mat.
  • FIG. 20 is a drawing explaining the pitch between continuous carbon fiber bundles when arranged in parallel to be supplied to a chopper.
  • FIG. 21 is a plan view showing the arrangement of the six compartments of the partition box and the direction when the partition box is placed on the carrier film.
  • FIG. 22(a) shows the positional relationship between the partition box and the side cover
  • FIG. 22(b) shows the positional relationship between the partition box, the side cover and the lower partition.
  • the running direction of the carrier film is perpendicular to the plane of the paper.
  • FIG. 23 shows the positional relationship among the chopper, the fragmentation processor, the first carrier film, the lower partition and the upper partition.
  • FIGS. 24(a)-(c) show corrugated plates whose horizontal sections are sinusoidal, triangular, and trapezoidal, respectively.
  • FIG. 25 is a plan view showing a plurality of lower partitions arranged along the T direction, the normals of which are inclined from the T direction in the horizontal plane.
  • FIG. 26 is a schematic diagram showing basket rolls.
  • One embodiment of the present invention relates to a method for manufacturing SMC including the following (i) to (v). (i) Pull out the carrier film from the roll and run it so that its width direction is kept horizontal. (ii) When a horizontal direction perpendicular to the running direction of the carrier film is the T direction, a chopper equipped with a cutter roll having a rotation axis parallel to the T direction is used to feed a plurality of continuous carbon fiber bundles parallel to each other. and cut each of them into a predetermined length within the range of 5 mm to 60 mm with the chopper.
  • the chopped carbon fiber bundles produced by the cutting are fragmented by the following fragmentation processing apparatus A arranged under the chopper, and then dropped onto the carrier film to deposit a carbon fiber mat.
  • the fragmentation processing apparatus A has a first pin roll and a second pin roll each having a rotation axis parallel to the T direction arranged in a direction orthogonal to the T direction, and the first pin roll is arranged in the direction perpendicular to the T direction.
  • the pins are rotatably driven such that the pins move from top to bottom, and the second pin roll is rotatably driven such that the pins move from top to bottom on the side facing the first pin roll. It is a fragmentation processing device.
  • Continuous carbon fiber bundle used in the SMC manufacturing method according to the present embodiment is preferably made of PAN (polyacrylonitrile)-based carbon fiber filaments, and the number of filaments per bundle is not limited, but is, for example, 3K. ⁇ 100K.
  • NK means N ⁇ 1000. Therefore, 3K-100K is, in other words, 3000-100000.
  • the continuous carbon fiber bundle may be partially split beforehand into a plurality of sub-bundles, as exemplified in, but not limited to, FIGS. 1 and 2 . 1 and 2, a continuous carbon fiber bundle 10 having a flat shape is partially split into five sub-bundles 11 by slitting.
  • a continuous carbon fiber bundle 10 having a flat shape is partially split into five sub-bundles 11 by slitting.
  • the fiber direction (longitudinal direction) of the fiber bundle is the x direction
  • the width direction is the y direction
  • the thickness direction is the z direction
  • FIG. FIG. 2 shows a cross section of the continuous carbon fiber bundle 10 perpendicular to the x direction (a cross section cut along the yz plane).
  • the first slit row AS1 is composed of a plurality of first slits S1 arranged in the x direction.
  • the second slit array AS2 is composed of a plurality of second slits S2 arranged in the x direction.
  • the third slit row AS3 is composed of a plurality of third slits S3 arranged in the x direction.
  • the fourth slit row AS4 is composed of a plurality of fourth slits S4 arranged in the x direction.
  • the slit length LS and the inter-slit gap length LG are constant within any slit row, and are also common between different slit rows.
  • the ratio L S /(L S +L G ) of the slit length L S to the sum of the slit length L S and the inter-slit gap length L G is usually 90% or more, preferably 95% or more. good. Therefore, the continuous carbon fiber bundle 10 is split into five sub-bundles 11 in most parts, as shown in FIG.
  • the positions of the first slit row AS1 , the second slit row AS2 , the third slit row AS3 , and the fourth slit row AS4 in the y direction are set so that the five sub-bundles 11 have substantially the same width. It is For example, when the number of filaments of the continuous carbon fiber bundle 10 is 15K, the number of filaments of each sub-bundle 11 is 3K ⁇ 0.5K.
  • the slit length L S is not limited, it is preferably longer than 100 mm, more preferably longer than 500 mm.
  • the slit length L S is, for example, more than 25 mm and 50 mm or less, more than 50 mm and 100 mm or less, more than 100 mm and 200 mm or less, more than 200 mm and 500 mm or less, more than 500 mm and 1000 mm or less, more than 1000 mm and 1500 mm or less, more than 1500 mm and 2000 mm or less, more than 2000 mm and 3000 mm or less, and the like.
  • the inter-slit gap length LG may be, but is not limited to, 1-10 mm, for example.
  • the x-direction position of the inter-slit gap GS is preferably the same among all slit rows as in the example shown in FIG. 1, but is not essential.
  • the above description is not limited to the case where the number of sub-bundles formed by partial splitting of the continuous carbon fiber bundle 10 is 5, and the same applies to cases where the number is 4 or less or 6 or more. .
  • the number of filaments in the sub-bundles formed by splitting the continuous carbon fiber bundle 10 is preferably 15K or less, more preferably 10K or less, still more preferably 5K or less, 4K or less, regardless of the number of sub-bundles to be formed. Furthermore, it may be 3K or less.
  • the number of filaments in a sub-bundle is preferably, but not limited to, greater than 0.5K.
  • FIG. 3 shows a conceptual diagram of an SMC manufacturing apparatus that can be preferably used when manufacturing SMC using the SMC manufacturing method of the present embodiment.
  • the SMC manufacturing apparatus 100 has a first coater 110, a second coater 120, a chopper 130, a fragmentation processor 140, a lower partition 150 and an impregnator 160.
  • the width directions of the first carrier film 41 and the second carrier film 42 pulled out from different rolls are always kept horizontal.
  • the first coating machine 110 is used to apply the first resin paste 51 to the first carrier film 41 to form the first resin paste layer 51L.
  • the second coating machine 120 is used to apply the second resin paste 52 to the second carrier film 42 to form the second resin paste layer 52L.
  • the chopper 130 includes a cutter roll 131, a receiving roll (rubber roll) 132 and a guide roll 133, as shown in FIG.
  • a plurality of cutting blades 131a extending in the rotation axis direction of the cutter roll 131 are arranged on the outer periphery of the cutter roll 131 at regular intervals in the circumferential direction.
  • the direction in which the cutting blade 131 a extends may be slanted with respect to the rotating shaft direction of the cutter roll 131 .
  • the rotation axes of the cutter roll 131, the receiving roll 132 and the guide roll 133 are all parallel to the T direction.
  • the T direction is horizontal and perpendicular to the running direction of the first carrier film 41 .
  • the T direction is perpendicular to the plane of the paper.
  • the width direction of the first carrier film 41 running under the chopper 130 is also parallel to the T direction.
  • the fragmentation processing device 140 includes a pair of pin rolls, that is, a first pin roll 141 and a second pin roll 142, both of which have rotation axes parallel to the aforementioned T direction.
  • the first pin roll 141 and the second pin roll 142 are arranged in a direction orthogonal to the T direction.
  • the fragmentation processing device 140 has a cover 143 and a guide plate 144 arranged inside it, but this is not essential.
  • the purpose of the fragmentation treatment performed by the fragmentation treatment device 140 is to divide one chopped carbon fiber bundle 20 into two or more fiber bundles by striking with a pin roll, thereby depositing on the first carrier film 41 To increase the ratio of chopped carbon fiber bundles composed of a smaller number of fiber filaments contained in the carbon fiber mat 30.
  • not all of the chopped carbon fiber bundles produced by cutting the continuous carbon fiber bundles need to be divided into two or more fiber bundles. Some chopped carbon fiber bundles may pass through the shredder without being split into two or more fiber bundles.
  • the first pin roll 141 has a cylinder 141a and a plurality of pins 141b arranged on the peripheral surface of the cylinder 141a.
  • the plurality of pins 141b preferably have the same shape and size as each other.
  • Both the cylinder 141a and the pin 141b are rigid and made of, for example, a metal material. Examples of metallic materials include, but are not limited to, steel, stainless steel and aluminum alloys.
  • the diameter of the cylinder 141a can be, but is not limited to, for example 60 mm to 150 mm.
  • the pin 141b extends perpendicular to the axis of rotation of the first pin roll 141 and has, for example but not limited to, a cylindrical shape.
  • the boundary between the end surface and the peripheral surface of the pin 141b may be chamfered.
  • the diameter of the pin 141b can be, but is not limited to, 1 mm to 5 mm, for example.
  • the length L P1 of the pin 141b ie, the distance from the tip to the root of the pin, can be, but is not limited to, 10 mm to 50 mm, for example.
  • the arrangement of the pins 141b on the peripheral surface preferably overlaps the original arrangement when shifted 5 mm to 20 mm in the axial direction and 4 mm to 30 mm in the circumferential direction.
  • the arrangement of the pins 141b shown in FIG. 7 overlaps the original arrangement when shifted axially by 2.5 mm and circumferentially by approximately 4.3 mm.
  • the maximum radius of the pin roll is defined as the distance from its axis of rotation to the tip of the pin.
  • the radius of the cylinder 141a is preferably half or more of the maximum radius of the first pin roll 141, more preferably 75% or more. This is because the higher the ratio of the cylinder radius to the maximum radius of the pin roll, the smaller the difference between the peripheral speed at the tip of the pin and the peripheral speed at the root of the pin when the pin roll is rotating.
  • a magnetic material can be used as the material of the pin 141b.
  • the pin 141b is firmly fixed to the cylinder 141a so as not to fall off during manufacturing. It can be easily spotted using a sensor-based metal detector.
  • Suitable examples of the magnetic material include steel and magnetic stainless steel.
  • austenitic stainless steels belonging to chromium-nickel stainless steels (representative steel grades are 18Cr-8Ni stainless steels such as SUS304 of Japanese Industrial Standards) do not have magnetism.
  • austenitic-ferritic stainless steel belonging to chromium-nickel stainless steel (typical steel grades are SUS329J1 and SUS329J4L of Japanese Industrial Standards) and ferritic stainless steel belonging to chromium-based stainless steel (typical steel grades are Japanese Industrial Standards) 18Cr stainless steel such as SUS430), martensitic stainless steel (typical steel grades are 13Cr stainless steel such as SUS410 of Japanese Industrial Standards), and precipitation hardening stainless steels (typical steel grades are SUS630 and SUS631 of Japanese Industrial Standards ) is a magnetic material.
  • first pinroll 141 also applies to the second pinroll 142 .
  • the sum of the maximum radius r M1 of the first pin roll 141 and the maximum radius r M2 of the second pin roll 142 is preferably greater than the distance d 12 between the rotation axes of these two pin rolls.
  • the sum of the maximum radius r M1 of the first pin roll 141 and the cylinder radius r C2 of the second pin roll 142 and the sum of the cylinder radius r C1 of the first pin roll 141 and the maximum radius r M2 of the second pin roll are both The distance d between the rotation axes of the pin rollers is smaller than 12 .
  • the distance d12 between the rotation axes of the first pin roll 141 and the second pin roll 142 may be variable. That is, the fragmentation processing device 140 is configured so that the positions of the rotation shafts of one or both of the first pin roll 141 and the second pin roll 142 can be moved horizontally along the running direction of the first carrier film 41. can do.
  • Both the first pin roll 141 and the second pin roll 142 are rotationally driven by a drive mechanism (not shown). As shown in FIG. 5, the first pin roll 141 rotates such that the pin 141b moves from top to bottom on the side facing the second pin roll 142, and the second pin roll 142 faces the first pin roll 141. The side rotates so that the pin 142b moves from top to bottom. Rotating both the first pin roll 141 and the second pin roll 142 is advantageous in preventing the chopped carbon fiber bundles 20 from getting stuck between these two pin rolls.
  • the rotational speeds of the first pin roll 141 and the second pin roll 142 may be independently controllable.
  • the chopped carbon fiber bundle 20 produced by cutting the continuous carbon fiber bundle 10 by the chopper 130 passes between the first pin roll 141 and the second pin roll 142 and falls onto the first carrier film 41. 140 is located directly below chopper 130 .
  • the cutter roll 131 and the receiving roll 132 are brought into contact directly above the gap between the first pin roll cylinder 141a and the second pin roll cylinder 142a.
  • a lower partition 150 perpendicular to the T direction.
  • the lower partition 150 is flat and its thickness direction is parallel to the T direction. In other words, the normal to the lower partition 150 and the T direction are parallel.
  • FIG. 9A when the space below the fragmentation device 140 is partitioned into a plurality of regions along the T direction by one or more lower partitions 150, the chopped carbon fiber bundles 20 in this space movement in the T direction is confined within each region.
  • the lower partition 150 may preferably be a metal plate, but is not so limited.
  • the lower partition 150 may be a perforated plate or a mesh as long as it can prevent the chopped carbon fiber bundles 20 from moving. It is desirable that the lower partition 150 have sufficient strength to prevent it from fluttering due to the airflow generated by the rotation of the first pin roll 141 and the second pin roll 142, but it is not desirable to be too thick.
  • its thickness is preferably 5 mm or less, more preferably 3 mm or less.
  • the preferred mode of placing the lower partition 150 is as follows. First, the lower partition 150 is arranged along the running direction of the first carrier film 41 so as to intersect both the vertical plane containing the rotation axis of the first pin roll 141 and the vertical plane containing the rotation axis of the second pin roll 142. preferably extended. This is because most of the chopped carbon fiber bundles 20 falling on the first carrier film 41 fall through the region sandwiched between these two vertical planes.
  • the distance d P1 from the peripheral surface of the cylinder 141 a of the first pin roll is preferably greater than the length L P1 of the first pin roll pin 141 b at any part of the upper edge 150 a of the lower partition 150 .
  • the distance d P2 from the peripheral surface of the cylinder 142a of the second pin roll is greater than the length L P2 of the pin 142b of the second pin roll.
  • the difference between the distance d P1 and the length LP1 of the pin 141b of the first pin roll, and the difference between the distance d P2 and the length LP2 of the pin 142b of the second pin roll are both 0.1 cm or more, and further It is more preferably 0.5 cm or more.
  • the distance d P1 from the peripheral surface of the cylinder 141a of the first pin roll is less than the length of the pin 141b of the first pin roll LP1 plus 3 cm, preferably less than LP1 plus 2 cm, more preferably LP1 plus 1 less than .2 cm.
  • the distance d P2 from the cylinder 142a of the second pin roll is less than the length of the pin 141b of the second pin roll LP2 plus 3 cm, preferably less than LP2 plus 2 cm, more preferably less than LP2 plus 1.2 cm is.
  • the distance d12 between the rotation axes of the first pin roll 141 and the second pin roll 142 is variable, either one or both of the first pin roll 141 and the second pin roll 142 are used as the first carrier film 41
  • All or part of the upper edge 150a of the lower partition 150 may be horizontal so that it can be moved horizontally along the direction of travel. In the example shown in Figure 23, the entire upper edge 150a of the lower partition 150 is horizontal.
  • the first carrier is preferably 20 cm or less, more preferably 15 cm or less, still more preferably 10 cm or less.
  • the distance d P3 can be, for example, 5 cm or more so that there is a sufficient gap between the lower edge 150b of the lower partition and the carbon fiber mat deposited on the first carrier film 41 .
  • FIG. 1 In the example of FIG. 1
  • the front edge of the lower partition 150 ie the edge of the first carrier film 41 in the running direction
  • the rear edge of the lower partition 150 ie the running direction of the first carrier film 41
  • the pitch P when arranging a plurality of lower partitions 150 along the T direction is preferably 20 cm or less, more preferably 15 cm or less, still more preferably 10 cm or less, and 7.5 cm or less, and even more preferably 5 cm or less.
  • the pitch P is preferably twice or more, more preferably three times or more, the fiber length of the chopped carbon fiber bundles 20 produced by cutting the continuous carbon fiber bundles 10 by the chopper 130 . Setting the pitch P in this way makes it difficult for the chopped carbon fiber bundles to be oriented along the lower partition 150 when deposited on the first carrier film 41 .
  • the lower partition 150 may be corrugated such that the horizontal cross-section is corrugated.
  • the direction of the chopped carbon fiber bundles 20 that collide with or contact the lower partition 150 and fall varies depending on the manner of collision or contact, so that the chopped carbon fiber bundles 20 are deposited on the first carrier film 41.
  • the randomness of the orientation of the fiber bundles is less likely to be impaired.
  • FIG. 12 shows an example in which the lower partition 150 is corrugated so that the horizontal cross section has a rectangular wave shape.
  • the corrugation is not limited to a rectangular wave, and may be a sine wave, a triangular wave, a trapezoidal wave, or the like.
  • FIGS. 24(a) to 24(c) illustrate corrugated plates whose horizontal cross-sectional shapes are sine wave, triangular wave, and trapezoidal wave, respectively.
  • the pitch and height of corrugation can be, for example, approximately the same as the fiber length of the chopped carbon fiber bundle, but are not limited. These can be optimized by trial and error depending on the wavy waveform.
  • the thickness of the carbon fiber mat 30 deposited on the first carrier film 41 can be locally reduced at such portions.
  • the lower partition 150 In order to prevent such a situation, at least a portion of the lower partition 150, preferably at least at a portion sandwiched between a vertical plane containing the rotation axis of the first pin roll 141 and a vertical plane containing the rotation axis of the second pin roll 142, the lower partition The 150 normal can be tilted from the T direction in the horizontal plane.
  • An example is shown in FIG.
  • the inclination angle ⁇ can be 1° or more, 5° or more, 10° or more, 15° or more, or 20° or more, and can be 45° or less, 40° or less, or 35° or less, but is not limited. do not have.
  • the multiple lower partitions 150 are parallel to each other, but such a configuration is not required.
  • the lower partitions 150 need not be parallel to each other.
  • the width of the region where the amount of chopped carbon fiber bundles 20 deposited is reduced due to being shaded by the lower partition 150 is about the same as the length of the chopped carbon fiber bundles 20. It is estimated to be.
  • the tilt angle ⁇ when the normal line of the lower partition 150 is tilted from the T direction in the horizontal plane can be determined so as to satisfy the following formula (1).
  • d12 is the distance between the rotation axes of the first pin roll 141 and the second pin roll 142
  • LF is the fiber length of the chopped carbon fiber bundle 20.
  • the factor a is preferably 1, more preferably 2.
  • d12 ⁇ tan ⁇ is preferably 1.3 cm or more, more preferably 2.6 cm or more. Since the length of the chopped carbon fiber bundle 20 may exceed the fiber length depending on the angle formed by the cutting planes at both ends of the chopped carbon fiber bundle 20 and the fiber direction, this point should be taken into consideration when setting ⁇ . desirable.
  • At least a portion of the lower partition 150 preferably at least a vertical plane containing the axis of rotation of the first pin roll 141 and the axis of rotation of the second pin roll 142.
  • a similar effect can be obtained by corrugating the portion sandwiched between the vertical planes so that the horizontal cross section has a corrugated shape.
  • the waveform may be a square wave, but is preferably a trapezoidal wave, more preferably a sine wave, and most preferably a triangular wave.
  • the period of corrugation is desirably sufficiently larger than the length of the chopped carbon fiber bundles 20, and is therefore preferably twice or more the fiber length L F of the chopped carbon fiber bundles 20.
  • all of the lower partitions 150 may be placed inside the enclosure 152, as shown in FIG.
  • the enclosure 152 consists of two side walls 152a parallel to the traveling direction of the first carrier film 41, and a front wall 152b and a rear wall 152c parallel to the T direction.
  • the position of the upper end of the enclosure 152 may be higher than the upper ends of the first pin roll 141 and the second pin roll 142 provided in the fragmentation processing device 140 . That is, the enclosure 152 may surround the lower partition 150 at its lower portion and the first pin roll 141 and the second pin roll 142 at its upper portion. If the shredder 140 includes a cover 143, as in the example shown in FIG. may be integral with the cover 143 and surround the first pin roll 141 and the second pin roll 142 .
  • the inner dimension in the T direction at the lower end of the enclosure 152 is generally smaller than the width of the first carrier film 41 .
  • the width of the carbon fiber mat 30 deposited on the first carrier film 41 is the distance between the lower edges of the two sidewalls 152a.
  • the distance from the lower edges of the two side walls 152a of the enclosure 152 to the top surface of the first carrier film 41 is equal to or less than the distance from the bottom edge 150b of the lower partition to the top surface of the first carrier film 41.
  • the lower partition 150 may be seamlessly connected to each of the front wall 152b and rear wall 152c of the enclosure.
  • At least a portion of the enclosure 152 may be corrugated such that the horizontal cross-section is wavy.
  • the pitch and height of corrugation can be, for example, approximately the same as the fiber length of the chopped carbon fiber bundle, but are not limited.
  • As a modification in order not to lose the function of regulating the width of the carbon fiber mat 30 formed on the first carrier film 41 in the T direction, only all or part of each side wall 152a is left, and the rest of the enclosure 152 is provided. part can be removed. This modification has the advantage of facilitating the detection and repair of defects in the lower partition 150 as well as facilitating the removal of fluff that adheres to the lower partition.
  • an upper partition 154 perpendicular to the T direction may be placed above fragmenter 140, ie, in the space between chopper 130 and fragmenter 140.
  • FIG. 14 the upper edge 150a of the lower partition 150 and the lower edge 154b of the upper partition 154 each have horizontal portions at both ends, and the former and the latter abut each other at the horizontal portions.
  • Such configuration is preferred, but not required.
  • the positions of the lower partition 150 and the upper partition 154 in the T direction may be offset from each other.
  • the purpose of the upper partition 154 is to move the chopped carbon fiber bundle 20 in the T direction by the airflow generated by the rotation of the first pin roll 141 and the second pin roll 142 while the chopped carbon fiber bundle 20 falls from the chopper 130 toward the fragmentation processing device 140. By preventing this, the uniformity of the basis weight of the carbon fiber mat deposited on the first carrier film 41 in the T direction is further improved as compared with the case where only the lower partition 150 is used.
  • a preferred mode of arranging the upper partition 154 is as follows. First, the upper partition 154, like the lower partition 150, is arranged so that it intersects both the vertical plane containing the rotation axis of the first pin roll 141 and the vertical plane containing the rotation axis of the second pin roll 142. preferably extends along the running direction of the upper partition 154.
  • the distance d P1 from the peripheral surface of the cylinder 141a of the first pin roll is preferably greater than the length L P1 of the pins 141b of the first pin roll.
  • the distance d P2 from the peripheral surface of the cylinder 142a of the second pin roll is greater than the length L P2 of the pin 142b of the second pin roll.
  • the difference between the distance d P1 and the length LP1 of the pin 141b of the first pin roll, and the difference between the distance d P2 and the length LP2 of the pin 142b of the second pin roll are both 0.1 cm or more, and further It is more preferably 0.5 cm or more.
  • the following third condition and at least one of the fourth condition can be satisfied.
  • the distance dP2 from the peripheral surface of the cylinder 142a of the second pin roll is less than the length of the pin 141b of the second pin roll LP2 plus 3 cm, preferably less than LP2 plus 2 cm, more preferably LP2 plus 1 less than .2 cm.
  • the distance d12 between the rotation axes of the first pin roll 141 and the second pin roll 142 is variable, either one or both of the first pin roll 141 and the second pin roll 142 are used as the first carrier film 41
  • All or part of the lower edge 150b of the upper partition 154 may be horizontal so that it can be moved horizontally along the direction of travel. In the example shown in Figure 23, the entire lower edge 154b of the upper partition 154 is horizontal.
  • At least one of the fifth condition and the sixth condition can be satisfied.
  • Fifth condition the distance from the peripheral surface of the cutter roll 131 does not exceed 3 cm, preferably does not exceed 2 cm, and more preferably does not exceed 1 cm.
  • Sixth condition the distance from the peripheral surface of the backing roll 132 does not exceed 3 cm, preferably does not exceed 2 cm, and more preferably does not exceed 1 cm.
  • the upper end of the enclosure 152 may be positioned higher than the upper ends of the first pin roll 141 and the second pin roll 142 and the upper partition 154 may be arranged inside the enclosure 152 .
  • the lower partition 150 and the upper partition 154 may be joined together to form a unitary partition.
  • a comb 170 is arranged between the lower partition 150 and the first carrier film 41 .
  • the comb 170 has a structure in which a plurality of second rods 170b are fixed like teeth of a comb to the sides of a first rod 170a.
  • the comb 170 is arranged such that the first rod 170a is parallel to the T direction and the second rod 170b is perpendicular to the T direction.
  • the free end of the second rod 170b is the fixed end. It is tilted so as to be closer to the first carrier film 41 than.
  • the fixed end of the second rod 170b is located upstream of the free end in the running direction of the first carrier film 41, but it may be the other way around.
  • the comb 170 it is possible to prevent the orientation of the chopped carbon fiber bundles deposited on the first carrier film 41 from deviating in the running direction of the first carrier film 41 .
  • the use of comb 170 is optional and not required.
  • the traveling direction of the first carrier film 41 is horizontal below the fragmentation processing device 140 .
  • the upper surface of the first carrier film 41 is preferably maintained horizontally below the fragmentation processor 140 .
  • the SMC manufacturing apparatus 100 has a mechanism for gradually bringing the first carrier film 41 and the second carrier film 42 closer to the upstream side of the impregnator 160 .
  • the first carrier film 41 and the second carrier film 42 are laminated together to form the laminate 60 .
  • the first resin paste layer 51L, the carbon fiber mat 30 and the second resin paste layer 52L are sandwiched between the first carrier film 41 and the second carrier film .
  • the impregnation machine 160 is equipped with two upper and lower belt conveyors in order to sandwich and convey the laminate 60 from above and below with two conveyor belts, and also has rolls for sandwiching and pressurizing the laminate 60 together with the conveyor belts. ing.
  • the SMC manufacturing method of this embodiment is described in 1.2.
  • An example of using the SMC manufacturing apparatus described in 1. is as follows. First, a continuous carbon fiber bundle 10 is pulled out from a fiber package prepared in advance. A continuous carbon fiber bundle may be drawn from a bobbin package attached to a creel by external extraction, or a continuous carbon fiber bundle may be drawn by internal extraction from a package from which the bobbin has been extracted.
  • a plurality of continuous carbon fiber bundles 10 are arranged parallel to each other and supplied to the chopper 130 in a direction orthogonal to the T direction. At this time, the continuous carbon fiber bundles 10 are arranged so that the number of cuts per length of the cutter roll 131 in the axial direction is constant. Although it is preferable to arrange the continuous carbon fiber bundles 10 at a constant pitch, it is not essential. For example, when a plurality of lower partitions 150 are arranged at a constant pitch P in the T direction, continuous The carbon fiber bundles 10 may be arranged.
  • the chopper 130 cuts the continuous carbon fiber bundle 10 into chopped carbon fiber bundles 20 so that the fiber length after cutting is a predetermined length within the range of 10 to 60 mm.
  • the predetermined length may typically be 0.5 inches (about 1.3 cm), 1 inch (about 2.5 cm), 2 inches (about 5.1 cm), etc., but is not limited.
  • the fragmentation treatment by the fragmentation treatment device 140 is not aimed at loosening the chopped carbon fiber bundles 20 to a state similar to that of a single filament.
  • the fragmentation treatment does not generate fiber bundles and single filaments with a filament number of 0.5K or less, or even if they do occur, the content in the carbon fiber mat 30 deposited on the first carrier film 41 is
  • the peripheral speed at the pin tips of the first pin roll 141 and the second pin roll 142 is set so as to be less than 1% by weight.
  • the resulting chopped carbon fiber bundle contains, for some reason, Filament counts greater than ⁇ (N/n)+0.5 ⁇ K may be included.
  • the purpose of the fragmentation treatment may be to split such chopped carbon fiber bundles into a plurality of chopped carbon fiber bundles with less than ⁇ (N/n)+0.5 ⁇ K filaments per bundle.
  • the purpose of the fragmentation treatment may be to split a chopped carbon fiber bundle obtained by cutting a continuous carbon fiber bundle that is not partially split into chopped carbon fiber bundles having a smaller number of filaments. .
  • the first pin roll 141 and the second pin roll 142 are rotationally driven so that the pins on the side facing each other move from top to bottom.
  • One of the reasons that the fragmentation processor 140 has two pin rolls and rotates the two pin rolls in this way is that more chopped carbon fiber bundles 20 can be hit by the pins of the pin rolls, and in addition This is because even if the chopped carbon fiber bundles have a weight distribution, the carbon fiber mat 30 is difficult to have front and back surfaces.
  • the reason why the carbon fiber mat 30 is difficult to turn over is that both the heavy chopped carbon fiber bundles and the light chopped carbon fiber bundles are collected in a narrow area between the two pin rolls and fall onto the first carrier film 41 at the same time. .
  • the first resin paste 51 is a thermosetting resin composition, and its base resin is not limited, but includes, for example, vinyl ester resin (also called epoxy acrylate resin), unsaturated polyester resin, epoxy resin, polyimide resin, Maleimide resin or phenolic resin. A mixed resin of a vinyl ester resin and an unsaturated polyester resin may be used as the base resin.
  • the first resin paste 51 may contain a curing agent, a polymerization inhibitor, a thickener, a reactive diluent, a low-shrinkage agent, and the like, if necessary.
  • the chopped carbon fiber bundles 20 processed by the fragmentation processing device 140 fall on the upper surface of the first carrier film 41 on which the first resin paste layer 51L is formed, forming the carbon fiber mat 30.
  • the second coating machine 120 is used to apply the second resin paste 52 having the same composition as the first resin paste 51 to the second carrier film 42 .
  • the second carrier film 42 is superimposed on the first carrier film 41 on which the carbon fiber mat 30 is placed, with the surface on which the second resin paste layer 52L is formed facing down, thereby forming a laminate 60.
  • the carbon fiber mat 30 is impregnated with the first resin paste 51 and the second resin paste 52 by being pressurized by the impregnator 160 .
  • the impregnated carbon fiber mat 30 is wound around a bobbin while being sandwiched between the first carrier film 41 and the second carrier film 42 .
  • the sheet molding compound is completed through a step of increasing the viscosity of the first resin paste 51 and the second resin paste 52 that have permeated the carbon fiber mat 30 .
  • Sheet molding compounds are used for molding CFRP products, for example using compression molding processes. CFRP products that can be manufactured using a sheet molding compound include not only parts used in aircraft, unmanned aerial vehicles, automobiles, ships, and other transportation equipment, but also sporting goods and leisure goods.
  • Modified Embodiment In a modified embodiment, the above 1. A modification is added to the SMC manufacturing method and manufacturing apparatus described in 1 to replace the fragmentation processing device A with another type of fragmentation processing device, or to change the operation of the fragmentation processing device A.
  • the fragmentation device A is replaced with a single pin roll type fragmentation device having only one pin roll having a rotation axis parallel to the T direction.
  • a single pin roll provided in this fragmentation processing apparatus may have a maximum radius of, for example, 100 mm or more and 200 mm or less and a cylinder diameter of 40 mm or more and 60 mm or less, but is not limited thereto.
  • first vertical plane and second vertical plane are defined as follows: a vertical plane containing the axis of rotation of the pin roll midway between the first and second vertical planes is The distance to the first vertical plane and the distance to the second vertical plane from the vertical plane located and containing the axis of rotation of the pin roll are both twice the maximum radius of the pin roll.
  • the lower partition defining the space into which the fragmented chopped carbon fiber bundles fall preferably has a portion sandwiched between the first vertical plane and the second vertical plane. Whether the lower partition intersects one or both of the first and second vertical planes, whether the lower partition is continuous between the first and second vertical planes, etc., depends on the chopped carbon. It may be determined after observing the position where many fiber bundles fall.
  • At least part of the lower partition can be corrugated so that the horizontal cross-section is wave-shaped, in order to make it difficult for the chopped carbon fiber bundles to orient along the lower partition.
  • the waveform can be a square wave, a sine wave, a triangular wave or a trapezoidal wave, but is not limited.
  • the first carrier film does not have a portion running right under the lower partition from the beginning to the end when passing under the fragmentation processing device. Therefore, at least part of the lower partition, the normal line of the lower partition may be inclined from the T direction in the horizontal plane.
  • the tilt angle can be 1° or more, 5° or more, 10° or more, 15° or more, or 20° or more, and can be 45° or less, 40° or less, or 35° or less, but is not limited. .
  • the tilt angle ⁇ when the normal line of the lower partition is tilted from the T direction in the horizontal plane can be determined so as to satisfy the following formula (2).
  • D 12 is the distance between the first vertical plane and the second vertical plane (four times the maximum radius of the pin roll) in equation (2), and LF is the fiber length of the chopped carbon fiber bundle.
  • the factor a is preferably 1, more preferably 2.
  • At least a part of the lower partition may be corrugated so that the horizontal cross section has a wave shape.
  • the undulating waveform may be a square wave, but is preferably a trapezoidal wave, more preferably a sine wave, and most preferably a triangular wave.
  • the corrugation period is preferably at least twice the fiber length of the chopped carbon fiber bundle.
  • the fragmentation device A is replaced with a basket roll type fragmentation device.
  • the cage roll type fragmentation processing apparatus includes a cage roll having a rotation axis parallel to the T direction as means for hitting the chopped carbon fiber bundles.
  • a basket roll is a roll that has as a unit structure a structure in which a plurality of elongated members are bridged between a pair of discs fixed around a central rod, and whose rotation axis is the central axis of the central rod. Examples of elongated members include bars with various cross-sectional shapes such as round bars, square bars or flat bars, and taut wires.
  • a basket roll may have multiple of the above unitary structures around a central rod, and may have a disk shared between two unitary structures.
  • the basket roll 241 illustrated in FIG. 26 consists of a central rod 241a, a pair of discs 241b fixed around it, and six round bars 241c bridged between the pair of discs.
  • all the rods are arranged on one cylindrical surface centered on the axis of rotation, but in other examples, multiple rods are arranged on each of multiple concentric cylindrical surfaces centered on the axis of rotation.
  • of round bars or other elongated members
  • the number of round bars (or other elongated members) placed on each cylindrical surface is not limited to six.
  • the diameter of the elongate member is, for example, 3 mm or less, may be 1.5 mm or less, and may be 1 mm or more.
  • the maximum radius of the cage roll is defined as the radius of the cylinder centered on the axis of rotation that contacts the elongated member farthest from the axis of rotation from the side opposite to the axis of rotation.
  • the radius of the dashed line shown in the left diagram of FIG. 26 is the maximum radius.
  • the maximum radius of the basket roll can be, for example, in the range of 100 mm or more and 200 mm or less, but is not limited.
  • the "third vertical plane” and the “fourth vertical plane” are defined as follows: the vertical plane containing the axis of rotation of the basket rolls midway between the third and fourth vertical planes. is located, and the distance from the vertical plane containing the axis of rotation of the basket roll to the third vertical plane and the distance to the fourth vertical plane are both twice the maximum radius of the basket roll.
  • the lower partition placed in the space where the fragmented chopped carbon fiber bundles fall has a portion sandwiched between the third vertical plane and the fourth vertical plane. Whether the lower partition intersects one or both of the third and fourth vertical planes, whether the lower partition is continuous between the third and fourth vertical planes, etc., depends on the chopped carbon. It may be determined after observing the position where many fiber bundles fall.
  • At least part of the lower partition can be corrugated so that the horizontal cross-section is wave-shaped, in order to make it difficult for the chopped carbon fiber bundles to orient along the lower partition.
  • the waveform can be a square wave, a sine wave, a triangular wave or a trapezoidal wave, but is not limited.
  • the first carrier film does not have a portion running right under the lower partition from the beginning to the end when passing under the fragmentation processing device. Therefore, at least part of the lower partition, the normal line of the lower partition may be inclined from the T direction in the horizontal plane.
  • the tilt angle can be, for example, 1° or more, 5° or more, 10° or more, 15° or more, or 20° or more, and can be 45° or less, 40° or less, or 35° or less, but is limited is not.
  • the tilt angle ⁇ when the normal line of the lower partition is tilted from the T direction in the horizontal plane can be determined so as to satisfy the following formula (3).
  • D 34 ⁇ tan ⁇ a ⁇ L F (3) where D 34 is the distance between the third vertical plane and the fourth vertical plane (four times the maximum radius of the basket roll) in equation (3), and LF is the fiber length of the chopped carbon fiber bundle.
  • the factor a is preferably 1, more preferably 2.
  • At least a part of the lower partition may be corrugated so that the horizontal cross section has a wave shape.
  • the undulating waveform may be a square wave, but is preferably a trapezoidal wave, more preferably a sine wave, and most preferably a triangular wave.
  • the corrugation period is preferably at least twice the fiber length of the chopped carbon fiber bundle.
  • the fragmentation processor of a different type from the fragmentation processor A used in the modified embodiment is described in 2.1. and 2.2. is not limited to those described in .
  • the direction of rotation of the pin rolls in the shredding apparatus A described above is changed so that at least one of the first pin roll 141 and the second pin roll 142 is rotated from below on the side facing the other pin roll. It may be rotationally driven so as to move upward.
  • a carbon fiber mat is produced from the above partially split continuous carbon fiber bundles. did. More specifically, a continuous carbon fiber bundle is cut into a length of about 1 inch (25.4 mm) with a chopper, and the resulting chopped carbon fiber bundle is run horizontally at a linear speed of 5 m / min. A carbon fiber mat was formed by dropping onto an uncoated carrier film.
  • FIG. 16 shows the filament number distribution of the chopped carbon fiber bundles in the carbon fiber mat, obtained by converting the measured weight into the number of filaments.
  • the content of carbon fiber bundles having a filament number exceeding 0.5K was 99.9% by weight or more.
  • Experiment 2 A carbon fiber mat was produced using the same SMC manufacturing apparatus as that used in Experiment 1 except that it was equipped with a fragmentation treatment apparatus, and the filament number distribution of chopped carbon fiber bundles in the carbon fiber mat was measured.
  • the procedure for producing the carbon fiber mat was the same as in Experiment 1, except that the chopped carbon fiber bundles were fragmented with a fragmentation processor before being deposited on the carrier film.
  • the fragmentation processing apparatus was provided with two horizontally aligned pin rolls each having a rotation axis parallel to the T direction, and both of the two pin rolls were made of metal and had the same configuration.
  • the diameter and length of the pins placed on the cylinder circumference of the pin roll were 3 mm and 20 mm, respectively.
  • the arrangement of the pins on the cylinder peripheral surface of the pin roll was periodic, and when the peripheral surface was expanded, it overlapped with the original arrangement when shifted 7.5 mm in the axial direction and 6.5 mm in the circumferential direction.
  • the sum of the maximum radii of each pin roll was 10 mm greater than the distance between the axes of rotation of the two pin rolls.
  • FIG. 17 shows the filament number distribution of the chopped carbon fiber bundles in the produced carbon fiber mat.
  • the content of carbon fiber bundles having a filament number exceeding 0.5K was 99.9% by weight or more.
  • Experiment 3 A carbon fiber mat was made in the same manner as Experiment 2, except that the two pin rolls were rotated so that the pins moved from bottom to top on the side facing the other pin roll, and the number of filaments was determined. distribution was measured.
  • FIG. 18 shows the filament number distribution of the chopped carbon fiber bundles in the produced carbon fiber mat. It was found that in the fragmentation treatment of Experiment 3, the chopped carbon fiber bundles tended to fragment more finely than in Experiment 2.
  • Experiment 4 A carbon fiber mat was produced in the same manner as Experiment 2 except that the two pin rolls were rotated in the same direction, and the filament number distribution was measured.
  • FIG. 19 shows the filament number distribution of the chopped carbon fiber bundles in the produced carbon fiber mat. It was found that the fragmentation treatment of Experiment 4 tended to fragment the chopped carbon fiber bundles more finely than that of Experiment 2.
  • the SMC manufacturing apparatus shown in FIG. 3 is the same as the SMC manufacturing apparatus shown in FIG.
  • the following experiment was conducted using an SMC manufacturing apparatus having a basic configuration.
  • a flat continuous carbon fiber bundle TR50S15L manufactured by Mitsubishi Chemical Co., Ltd.
  • a filament number of 15K a width of 8 mm and a thickness of 0.1 mm was cut into about 0.5 mm. It was partially split into nine 9 mm wide sub-bundles.
  • the position of the inter-slit gap in the fiber direction was the same for all slit rows.
  • the 52 partially split continuous carbon fiber bundles were arranged parallel to each other and supplied to the chopper of the SMC manufacturing apparatus from the direction orthogonal to the T direction.
  • the pitches between the continuous carbon fiber bundles when arranged in parallel to feed the chopper were alternately 8 mm and 16 mm, as shown in FIG.
  • a continuous carbon fiber bundle is cut into a length of about 1 inch (25.4 mm) with a chopper, and the resulting chopped carbon fiber bundle is fragmented with a fragmentation device, and then horizontally at a linear speed of 5 m / min.
  • the running resin paste was dropped onto the uncoated carrier film.
  • the two side covers placed under the fragmentation treatment device were made of aluminum alloy plates, parallel to the running direction of the carrier film, and had a length of 200 mm along the running direction of the carrier film. Both side covers were arranged so as to intersect both a vertical plane containing the axis of rotation of one pin roll of the shredder and a vertical plane containing the axis of rotation of the other pin roll of the shredder.
  • the lower edge of each side cover was horizontal, and the distance from the upper surface of the running carrier film was 58 mm.
  • the lower portion of each side cover was slightly bent inward so that the interval in the T direction between the lower edges of both side covers was 600 mm. As a result of using the side cover, the width of the carbon fiber mat deposited on the carrier film in the T direction was about 600 mm.
  • Both ends of the upper edge of the lower partition and both ends of the lower edge of the upper partition are provided with horizontal portions, respectively, and between the paired lower partition and the upper partition, the upper edge of the former and the lower edge of the latter are horizontal. It was made to hit each other at the part.
  • Both the lower and upper partitions had straight trailing and leading edges parallel to each other.
  • the trailing and leading edges were vertical.
  • the length from the trailing edge to the leading edge of the lower partition and the upper partition, that is, the length along the traveling direction of the carrier film was 370 mm.
  • Both the lower partition and the upper partition were arranged so as to intersect both the vertical plane containing the rotation axis of one pin roll of the fragmentation processor and the vertical plane containing the rotation axis of the other pin roll of the fragmentation processor.
  • the upper edge of the upper partition shall be parallel to the peripheral surface of the receiving roll of the chopper at a distance of 10 mm at the portion facing the peripheral surface of the receiving roll of the chopper, and 10 mm from the peripheral surface of the cutter roll at the portion facing the peripheral surface of the cutter roll of the chopper. They were placed in parallel at a distance.
  • the lower edge of the upper partition is parallel to the peripheral surface of one pin roll of the shredder at a distance of 30 mm at the portion facing the peripheral surface of the shredder, and is parallel to the peripheral surface of the other pin roll of the shredder.
  • the facing portions were parallel to the peripheral surface with a distance of 30 mm.
  • the upper edge of the lower partition is parallel to the peripheral surface of one pin roll of the shredder at a distance of 30 mm at the portion facing the peripheral surface of the shredder, and is parallel to the peripheral surface of the other pin roll of the shredder.
  • the facing portions were parallel to the peripheral surface with a distance of 30 mm.
  • the lower edge of the lower partition was horizontal and the distance from the upper surface of the carrier film was 177 mm.
  • Experiment 7 Fifty-two partially split continuous carbon fiber bundles were supplied to the chopper and cut in the same manner as in Experiment 6, except that the upper partition was not installed and only the lower partition was installed in the SMC manufacturing equipment, resulting in The chopped carbon fiber bundle was treated with a fragmentation treatment device and then dropped onto a running carrier film. In the same manner as in Experiment 6, the partition box was placed on the carrier film and passed under the fragmentation processing device, and the weight of the chopped carbon fiber bundles that fell into each of the six sections A to F of the partition box was measured, Averages, standard deviations and coefficients of variation between plots were calculated.
  • Experiment 8 Fifty-two partially split continuous carbon fiber bundles were supplied to the chopper and cut in the same manner as in Experiment 6, except that only the upper partition was installed in the SMC manufacturing apparatus without the lower partition, resulting in The chopped carbon fiber bundle was treated with a fragmentation treatment device and then dropped onto a running carrier film. In the same manner as in Experiment 6, the partition box was placed on the carrier film and passed under the fragmentation processing device, and the weight of the chopped carbon fiber bundles that fell into each of the six sections A to F of the partition box was measured, Averages, standard deviations and coefficients of variation between plots were calculated.

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PCT/JP2022/006032 2021-02-16 2022-02-16 シートモールディングコンパウンドの製造方法、炭素繊維マット堆積装置およびシートモールディングコンパウンド製造装置 Ceased WO2022176866A1 (ja)

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EP25154355.9A EP4545265A1 (en) 2021-02-16 2022-02-16 Sheet molding compound production method, carbon fiber mat deposition apparatus, and sheet molding compound production apparatus
JP2023500864A JP7597199B2 (ja) 2021-02-16 2022-02-16 シートモールディングコンパウンドの製造方法、炭素繊維マット堆積装置およびシートモールディングコンパウンド製造装置
CN202280013745.4A CN116917099A (zh) 2021-02-16 2022-02-16 片状模塑料的制造方法、碳纤维堆层堆积装置以及片状模塑料制造装置
EP22756184.2A EP4296027A4 (en) 2021-02-16 2022-02-16 METHOD FOR PRODUCING A MOLDED JOINT, DEVICE FOR DEPOSING A CARBON FIBER MAT AND DEVICE FOR PRODUCING A MOLDED JOINT
US18/231,701 US20230390967A1 (en) 2021-02-16 2023-08-08 Sheet Molding Compound Production Method, Carbon Fiber Mat Deposition Apparatus, and Sheet Molding Compound Production Apparatus

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