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WO2025073377A1 - Système et procédé de production de fils coupés pour la fabrication de mats à fils coupés - Google Patents

Système et procédé de production de fils coupés pour la fabrication de mats à fils coupés Download PDF

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Publication number
WO2025073377A1
WO2025073377A1 PCT/EP2023/077724 EP2023077724W WO2025073377A1 WO 2025073377 A1 WO2025073377 A1 WO 2025073377A1 EP 2023077724 W EP2023077724 W EP 2023077724W WO 2025073377 A1 WO2025073377 A1 WO 2025073377A1
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WO
WIPO (PCT)
Prior art keywords
rollers
strand
roller
strands
fibers
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PCT/EP2023/077724
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English (en)
Inventor
Jordi NADAL SELLARES
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Individual
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Individual
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Priority to PCT/EP2023/077724 priority Critical patent/WO2025073377A1/fr
Publication of WO2025073377A1 publication Critical patent/WO2025073377A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/02—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form
    • D01G1/04—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form by cutting

Definitions

  • a chopped strand mat is a fiber-reinforced composite material that uses chopped strands of glass fiber laid randomly and held together with a binder or stitching and are typically 2-5 cm in length.
  • the advantages of CSM compared with other composite materials are its strength-to-weight ratio, specific stiffness, and the equal distribution of loads in all directions on its surface.
  • CSM can be used between layers of woven fabric to help build thickness quickly and aid in all layers bonding well together.
  • the composite material disclosed in EP1478797 is a mat comprising discontinuous natural fibers and discontinuous glass fibers, the natural fibers having a length of less than 150 cm, whereas glass fibers have a length of between 10 and 200 mm.
  • the natural fibers are separated and carded, followed by needle punching, in other words, the resulting mat will have fibers aligned in the same direction. This is not desirable because the property of the equal distribution of loads in all directions is lost.
  • Another technical challenge is distributing randomly the chopped discontinuous fibers in a given surface because discontinuous threads tend to cake up.
  • the chopped strands to be produced can be made from discontinuous fibers, like flax fibers, as well as from continuous fibers, like glass fibers and carbon fibers.
  • first guiding means configured for receiving and orientating in a vertical position a band-like strand made of fibers
  • the rollers being arranged against each other at a tangential zone between them and being rotatable along their axis in opposed directions
  • the first roller of the fiber distributing rollers is a grooved roller that has a circumferentially grooved profile surface made of alternate circumferential peaks and valleys
  • the second roller of the fiber distributing rollers has a smooth surface in contact with the peaks of the profile surface of the first roller along the tangential zone, the spaces between the valleys and the smooth surface in the tangential zone being configured to house portions of the band-like strand made of fibers
  • the first guiding means are placed above the tangential zone and wherein at least one of the fiber distributing rollers is connected to a motor
  • each prong is located inside a corresponding valley of the grooved profile surface of the first roller of the fiber distributing rollers, the prongs being closer to the bottom of the valleys than to the peaks;
  • a band-like strand made of fibers is the result of pressing and flattening a strand made of fibers in order to achieve the form of a band, that is to say, with a cross section wider than its thickness.
  • the fiber distributing rollers distribute and divide the fiber material of the band-like strand by compacting it into the valleys of the first roller, producing corresponding a group of portions of the band-like strand. Since said group of portions, depending on the nature of the fibers, tends to remain embedded within the valleys, the scrapper disengages the group of portions, resulting a group of strands. Then, the lower ends of said group of strands are driven and/or pulled to the rotatory cutter for each strand to be cut in shorter strands called chopped strands.
  • the vertical distance between the upper end of the scrapper and the tangential zone (or the closest point between the fiber distributing rollers) between the fiber distributing rollers is comprised between 2 mm and 10 mm. Preferably, said vertical distance is about 8 mm. According to a particular embodiment of the system, the vertical distance between the upper end of the scrapper and the tangential zone between the fiber distributing rollers (the closest point between the rollers) is comprised between 2 and 6 times the thickness of the chopped strands to be produced by the system.
  • the distance between the edges of the peaks and the bottoms of the valleys of the grooved profile surface is between 0.8 and 2.0 times the distance between two consecutive peaks, preferably 1 .0 time.
  • the first cutter surface is configured as a vertical passage of a through hole with a transversal cross section with an oblong curved shape or with a bean shape, the wall of the through hole having retaining means to retain one or more portions of the band-like strand made of fibers.
  • the retaining means provided in the wall of the through hole is a grooved surface with teeth provided along the inner perimeter of the through hole.
  • the rotatory cutter has a plurality of second cutter surfaces arranged radially with regard to the cutter rotation axis.
  • Each one of the two pulling rollers has a grooved profile surface.
  • Said grooved profile surface is configured with a groove forming a knuckle thread or a round thread.
  • the surface of the pulling rollers has a very low surface roughness, namely, it has an Ra about between 0.2 and 0.3. This avoids the strands become embedded in the pulling rollers and no scrapper is needed.
  • the pressure between the pulling rollers is very low, since a compaction of the fibers is not wished.
  • the preferred distance between the surfaces of the pulling rollers is between 0.05 and 0.1 mm.
  • a method for producing chopped strands from fibers suitable for the manufacture of chopped strand mats is disclosed.
  • the method of the invention is characterised by comprising the following steps: a) providing a band-like strand made of discontinuous fibers; b) orientating said band-like strand in a vertical position; c) introducing said orientated band-like strand between a pair of opposed fiber distributing rollers of parallel horizontal axis, with the width of the band-like strand extending parallel to the axis of the rollers, the rollers being arranged against each other at a tangential zone between them and being rotatable along their axis in opposed directions, wherein the first roller of the fiber distributing rollers is a grooved roller that has a circumferentially grooved profile surface made of alternate circumferential peaks and valleys, and the second roller of the fiber distributing rollers has a smooth surface in contact with the peaks of the profile surface of the first roller along the tangential zone, the first roller of the fiber distributing roller
  • the lower parts of the strands pass through the rotatory cutter and are pulled downwards by a pulling means in the form of two opposed pulling rollers with their axis parallel to the axis of the fiber distributing rollers, the pulling rollers being arranged against each other and being rotatable along their axis in opposed directions, wherein each one of the two pulling rollers has a grooved profile surface.
  • Said pulling rollers are the ones previously disclosed with regard to the system object of the invention.
  • the band-like strand has a width comprised between 0.5 cm and 8.0 cm and a thickness comprised between 0.12 mm and 2.0 mm.
  • the band-like strand can be made of natural discontinuous fibers or continuous fibers.
  • the method object of the invention has been carried out starting from a band-like strand of flax fibers of a width of 2.5 cm and a thickness of 0.3 mm, and also from a band-like strand of carbon fibers of a width of 1 .0 cm and a thickness of 0.15 mm.
  • the method of the invention is carried out by means of the system previously disclosed according to the first aspect of the invention.
  • a chopped strand made from fibers is disclosed, being characterised in that it is obtainable by the method according to the second aspect of the invention.
  • the resulting chopped strand fibers are of 30 to 40 tex, flat, without torsion or twisty, and their length is preferably around 50 mm.
  • a fourth aspect of the invention is referred to a chopped strand mat made of fibers, characterized in that it comprises chopped strands that are those obtained by the method according the second aspect of the invention or the chopped strands are obtainable by the method according to the second aspect of the invention.
  • a preferred chopped strand mat made of fibers according to the fourth aspect of the invention comprises chopped strands made of flax fibers, chopped strands made of carbon fibers, and chopped strands made of glass fibers.
  • Fig. 2 is a schematic view which illustrates how the scrapper removes the portions of the band-like strand housed in the valleys of the first grooved roller of the fiber distributing rollers forming strands,
  • Fig. 3 is a schematic view which illustrates how the fiber strands are pulled by the pulling rollers and then cut by the rotatory cutter into chopped strands
  • Fig. 6 is lateral view which illustrates a preferred embodiment of the first roller of the fiber distributing rollers, the scrapper and the second guiding means,
  • Fig. 11 shows a photograph of a chopped strand mat made of a flax fiber chopped strands produced according to the invention
  • the area and dimensions of the peaks 31 and valleys 32 of the first roller 3 are appropriate to split the band-like strand 11 into portions 1 T and house them within the spaces created between the valleys 32 and the smooth surface 4’.
  • the band-like strand 11 is divided and distributed by the peaks 31 and the smooth surface 4’ into portions 1 T and the fiber material of each portion is accumulated and compacted by the smooth surface inside the valleys 32.
  • the number, area, shape and deepness of the valleys 32 will depend on the material, thickness and fiber density of the starting band-like strand 11 used. It is possible to not use band-like strands from the beginning, but the strand should have to undergo a widening step. Conveniently, the band-like strand 11 shall not be wider than the grooved profile surface 3’ of the first roller 3.
  • Fig. 7 shows an example of a grooved profile surface 3’ of the first roller 3, in particular, for processing a band-like strand 11 of flax fibers.
  • the distance between two consecutive peaks 33 is about 0.8mm, the peaks 33 have a general triangular shape with a flat top between 0.1 and 0.2 mm.
  • the bottom of the valleys 32 has preferably a radius of 0.3 mm and its sides an angle about 60°.
  • the starting point was a heat-treated steel cylinder with a hardness of 65 HrC, then, the cylinder of the first roller 3 was machined to create the valleys 32 and peaks 33. Additionally, a series of holes were drilled from front to back to circulate a coolant through the interior of the first roller 3.
  • the first guiding means 2 are placed above the tangential zone between the rollers 3 and 4.
  • the first guiding means 2 are made of two flat rectangular plates oriented in V, bent at their lower end configuring a vertical channel.
  • Fig. 8 shows how it is provided with multiple vertical prongs 51 at its upper end.
  • Each prong 51 is located inside a corresponding valley 32 of the grooved profile surface of the first roller 3, the prongs 51 being closer to the bottom of the valleys 32 than to the peaks 31.
  • the vertical distance between the upper end of the scrapper 5 and the tangential zone between the rollers 3, 4 is comprised between 2 and 10 mm. Said vertical distance depends on multiple factors like the nature of the discontinuous fibers, its “stickiness” to the valleys 32, the fiber density of the band-like strand 11 or its resistance to bending. For instance, when producing chopped strands 10 from flax fibers, said vertical distance is preferably about 8 mm.
  • the vertical distance between the upper end of the scrapper 5 and the tangential zone between the fiber distributing rollers 3, 4 may also be selected as to be comprised between 2 and 6 times the thickness of the chopped strands to be produced by the system 100.
  • rotatory cutter 7 depicted in detail in Fig. 9, it comprises a first cutter surface 71 and a plurality of second cutter surfaces 72.
  • the second cutter surfaces 72 are cutting blades arranged in a plane perpendicular to the tangential zone between the rollers 3, 4.
  • the blades of the second cutter surfaces 72 are arranged radially with regard to a cutter rotation axis 7’ around which they rotate.
  • the first cutter surface 71 is a serrated or grooved vertical surface which is fixed to the frame of the system 100. Indeed, the first cutter surface 71 is configured as a vertical passage of a through hole made in a plate below the vertical passage 61 of the second guiding means 6 of the system 100.
  • the transversal cross section of through hole has an oblong curved shape or a bean shape.
  • the wall of the through hole has retaining means to retain one or more portions of the band-like strand 11 made of fibers that the scraper 5 has removed from the valleys 32 of the first roller 3.
  • the retaining means is the teeth or grooves that made the serrated or grooved surface provided along the inner perimeter of the through hole.
  • each one of the two pulling rollers 9 has a grooved profile surface configured with a groove forming a knuckle thread or a round thread.
  • the surface of the pulling rollers 9 has a very low surface roughness, namely, it has an Ra about between 0.2 and 0.3.
  • the pressure between the pulling rollers 9 is very low, since a compaction of the fibers is not wished.
  • the preferred distance between the surfaces of the pulling rollers is between 0.05 and 0.1 mm.
  • the lower parts of the strands 12 pass through the first cutter surface 71 and are pulled downwards by the two opposed pulling rollers 9. Then, being pulled downwards, the strands 12 are cut by second cutter surfaces 72 into chopped strands 10.
  • the round thread of the surface of the pulling rollers 9 avoids that the strands 12 that have become separated after having passed the fiber distributing rollers 3 and 4 and the scrapper 5 come joined or connected again, which would affect to the distribution of the chopped strands 10 in the mats.
  • the low surface roughness of the surface of the pulling rollers 9 avoids the strands 10 become embedded in the pulling rollers 9 and thus, no additional scrapper is needed.
  • strands 12 pass through the vertical passage 61 of the second guiding means 6, they reach the through hole first cutter surface 71 that has a bean shape or an oblong curved shape.
  • Said through hole has a vertical wall with a serrated or grooved surface. As depicted in Fig. 9, the grooves extend vertically but the wall could have another kind of retaining means.
  • the lower ends of said strands 12 go through the through hole and are pulled by the pulling roller 9, one of the cutting blades of the second cutter surfaces 72 that rotate will cut the strands 12.
  • Second cutter surfaces 72 can be added to the body of the rotatory cutter 7.
  • the curved length of the circular trajectory between two consecutive second cutter surfaces 72 and the rotation speed of the rotatory cutter 7 determine the length of the chopped strands 11. It is even possible to obtain chopped strands 11 of different lengths with a same rotary cutter 7 by putting two consecutive second cutter surfaces 72 separated by a short distance and putting other two consecutive second cutter surfaces 72 with a longer distance.
  • the pulling rollers 9 project the chopped strands 10 in random directions, creating a dispersion cone that deposits the chopped strands 10 in a zone in a Gaussian fashion.
  • the length of the chopped strands 10, and therefore the distance at which the strands 12 are cut is similar to the length of the discontinuous fibers that form the strands 12.
  • the system 100 disclosed above is one of the ways to put into practice a method for producing chopped strands 10 from discontinuous fibers suitable for the manufacture of chopped strands mats.
  • the method also allows obtaining chopped strands 10 of continuous fibers.
  • the method comprises the following steps.
  • step c) the band-like material strand 11 is introduced between the pair of opposed fiber distributing rollers 3, 4.
  • the band-like strand 11 is moved downwards driven by the opposed rotation of the rollers 3, 4, passing between the peaks 31 and valleys 32 of the grooved profile surface 3’ of the first roller 3 and the smooth surface 4’ of the second roller 4 and being split and housed in the valleys 32 of the grooved profile of the first roller 3 forming portions 1 T of the band-like strand 11.
  • the chopped strands 10 are ejected in random directions as they are cut from the respective strands 12 by the rotatory cutter 7 and pulled by the pulling rollers 9, the chopped strands 10 fall by gravity and are homogenously distributed on an appropriate support layer, for instance a propylene layer or on a textile layer, for producing a chopped strand mat as the one shown in Fig. 11.
  • an appropriate support layer for instance a propylene layer or on a textile layer
  • a high TEX flax fiber band-like strand 11 was used as source material.
  • the flax fiber band-like strand 11 of Table 1 was used in the system 100 previously described. See the band-like strand 11 in Fig. 10.
  • the flax fiber band-like strand 11 in the form of a bobbin, was unwound and conveyed into the first guiding means 2 that guided the band-like strand 11 towards to the pair of opposed fiber distributing rollers 3 and 4.
  • the flax fiber band-like strand 11 When the flax fiber band-like strand 11 was inserted between the two fiber distributing rollers 3, 4, it split up by occupying spaces between the valleys 32 of the first roller 3 and the smooth surface 4’ at the height of the tangential zone.
  • the fiber density and thickness of the flax fiber band-like strand 11 used and its dimensions were proved to be appropriate for being split and housed by the rollers 3, 4, avoiding clogs and overheating.
  • the area and dimensions of the valleys 32 of the first roller 3 were proved to be appropriate to house the portions of the flax fiber band-like strand 11 , compacting it to form portions 1 T of the bandlike strand 11 to be converted into flax fiber strands 12 of approximately 30-40 tex.
  • the flax fiber strands portions 1 T passed the tangential zone of the fiber distributing rollers 3, 4, they tended to detach from the first roller 3 and abandon the valleys 32 because of its resistance to the bending force exerted by the rotation of the first roller 3. This detachment was favoured by the scrapper 5 with prongs 51 that dislodged the remaining flax fiber strand portions 1 T from the valleys 32.
  • the distance between the scrapper prongs 51 and the tangential zone of the fiber distributing rollers 3, 4 was about 8 mm. This distance was calculated considering the maximum point of resistance to bending of the flax fiber portions 1 T to make the detachment in the gentlest possible way.
  • the flax fiber strand portions protrude from the shear 50 mm to form, after their pass through the pulling rollers 9, chopped flax fiber strands 10 of approximately 50mm of length and a linear mass of 93 g/km.
  • the particular configuration of the pulling rollers 9 allowed the chopped flax fiber strands 10 to be projected in random directions without intersecting, creating a dispersion cone that deposited the flax fiber chopped strands 10a in a zone in a Gaussian fashion on a propylene textile of 195 g/m 2 , as it will be explained below.
  • Example 3 manufacturing of chopped strands mats Several chopped strand mats were manufactured using the flax fibers chopped strands 10a obtained in Example 1 and the carbon fibers chopped strands 10c obtained in Example 2. The flax fibers chopped strands 10a and the carbon fibers chopped strands 10c were pulled and deposited in a Gaussian fashion on a support layer of propylene textile by means of the pulling rollers 9.
  • Table 4 describes the density and composition of 7 different typologies of chopped strand mats that constitute the typologies of samples that were later tested.
  • Tensile tests The purpose of these tests is to determine the stress-strain curves of samples of the material in order to compare their structural response under a pure tensile test.
  • the modus operandi was:
  • Ao Original cross-section area.
  • Table 5 provides the width and thickness of the 5 tested FLL samples (flax fiber chopped strand mat samples), as well as their results of tensile strength and modulus of elasticity.
  • Fig. 14 shows the stress-strain curves of each FLL sample until the first crack appears.
  • the values of tensile strength and modulus of elasticity can be found in Table 6. The tensile strength can be obtained after the initial cracks (when the extensometer measures are not valid due to the cracking process); therefore, the tensile strength can be higher than the maximum stress of Fig. 14.
  • Table 7 provides the width and thickness of the 5 tested FV samples (glass fiber chopped strand mat samples), as well as their results of tensile strength and modulus of elasticity.
  • the tensile strength can be obtained after the initial cracks (when the extensometer measures are not valid due to the cracking process).
  • Table 8 provides the width and thickness of the 5 tested FLL+FV samples (samples of flax fiber (50% weight) + glass fiber (50% weight) chopped strand mats).
  • Table 9 provides the width and thickness of the 5 tested FLL+FC samples (samples of flax fiber (83% weight) + carbon fiber (17% weight) chopped strand mats).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un système et un procédé de production de fils coupés (10) à partir de fibres discontinues pour la fabrication de mats à fils coupés. Le système consiste en : - de premiers moyens de guidage pour un fil de type bande ; - une paire de rouleaux de distribution de fibres opposés (3, 4) d'axe horizontal parallèle disposés l'un contre l'autre au niveau d'une zone tangentielle entre eux et pouvant tourner le long de leur axe dans des sens opposés. Le premier rouleau possède une surface de profil rainurée de manière circonférentielle constituée de pics circonférentiels alternés (31) et de creux (32), et le second rouleau possède une surface lisse (4'). L'espace entre les vallées et la surface lisse loge des parties de la bande ; - un racleur (5) placé au-dessous de la zone tangentielle entre les rouleaux et pourvu de multiples griffes verticales (51) à son extrémité supérieure. Chaque broche est située à proximité de la partie inférieure des vallées (32) ; - de seconds moyens de guidage ; et - un dispositif de coupe rotatif.
PCT/EP2023/077724 2023-10-06 2023-10-06 Système et procédé de production de fils coupés pour la fabrication de mats à fils coupés Pending WO2025073377A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2023/077724 WO2025073377A1 (fr) 2023-10-06 2023-10-06 Système et procédé de production de fils coupés pour la fabrication de mats à fils coupés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2023/077724 WO2025073377A1 (fr) 2023-10-06 2023-10-06 Système et procédé de production de fils coupés pour la fabrication de mats à fils coupés

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WO2025073377A1 true WO2025073377A1 (fr) 2025-04-10

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Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0474651B2 (fr) 1988-02-23 1992-11-26
US5678774A (en) * 1995-12-18 1997-10-21 Etc. Industries Inc. Fiberglass cutting apparatus and method
WO2002055770A1 (fr) * 2001-01-12 2002-07-18 Willem Frans Van Der Mast Procede et dispositif de decoupage des fibres optiques
EP1478797A1 (fr) 2002-02-27 2004-11-24 Saint-Gobain Vetrotex France S.A. Mat de fibres naturelles et de verre
EP2808433A1 (fr) 2012-07-31 2014-12-03 Teijin Limited Mat aléatoire, et corps compact de matériau composite renforcé par des fibres
EP2808432A1 (fr) 2012-08-01 2014-12-03 Teijin Limited Mat aléatoire, et corps compact de matériau composite renforcé par des fibres
EP2810979A1 (fr) 2012-01-31 2014-12-10 Teijin Limited Matériau composite renforcé de fibres et mat aléatoire
ES2539902T3 (es) 2011-02-01 2015-07-07 Teijin Limited Malla aleatoria y material compuesto reforzado con fibra
EP3578711A1 (fr) 2017-02-02 2019-12-11 Toray Industries, Inc. Faisceau de fibres partiellement séparées et procédé de fabrication d'un tel faisceau de fibres partiellement séparées, faisceau de fibres coupées mettant en uvre ledit faisceau de fibres partiellement séparées, et matériau de moulage en résine renforcé par des fibres
EP3719078A1 (fr) 2017-11-29 2020-10-07 Teijin Limited Matériau composite, procédé de production d'un objet moulé et procédé de production de matériau composite
CN112011894A (zh) * 2020-09-04 2020-12-01 嘉兴学院 一种涤纶废丝的再生利用方法
ES2870850T3 (es) 2016-10-12 2021-10-27 Toray Industries Malla aleatoria y método de producción para la misma y material moldeado de resina reforzada con fibra que usa la malla aleatoria
ES2884306T3 (es) 2015-07-01 2021-12-10 Toray Industries Dispositivo para fabricar haz de fibras cortadas y método para su fabricación
JP2022149483A (ja) 2021-03-25 2022-10-07 東レ株式会社 短繊維強化プリプレグシートの製造方法

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0474651B2 (fr) 1988-02-23 1992-11-26
US5678774A (en) * 1995-12-18 1997-10-21 Etc. Industries Inc. Fiberglass cutting apparatus and method
WO2002055770A1 (fr) * 2001-01-12 2002-07-18 Willem Frans Van Der Mast Procede et dispositif de decoupage des fibres optiques
EP1478797A1 (fr) 2002-02-27 2004-11-24 Saint-Gobain Vetrotex France S.A. Mat de fibres naturelles et de verre
ES2539902T3 (es) 2011-02-01 2015-07-07 Teijin Limited Malla aleatoria y material compuesto reforzado con fibra
EP2810979A1 (fr) 2012-01-31 2014-12-10 Teijin Limited Matériau composite renforcé de fibres et mat aléatoire
EP2808433A1 (fr) 2012-07-31 2014-12-03 Teijin Limited Mat aléatoire, et corps compact de matériau composite renforcé par des fibres
EP2808432A1 (fr) 2012-08-01 2014-12-03 Teijin Limited Mat aléatoire, et corps compact de matériau composite renforcé par des fibres
ES2884306T3 (es) 2015-07-01 2021-12-10 Toray Industries Dispositivo para fabricar haz de fibras cortadas y método para su fabricación
ES2870850T3 (es) 2016-10-12 2021-10-27 Toray Industries Malla aleatoria y método de producción para la misma y material moldeado de resina reforzada con fibra que usa la malla aleatoria
EP3578711A1 (fr) 2017-02-02 2019-12-11 Toray Industries, Inc. Faisceau de fibres partiellement séparées et procédé de fabrication d'un tel faisceau de fibres partiellement séparées, faisceau de fibres coupées mettant en uvre ledit faisceau de fibres partiellement séparées, et matériau de moulage en résine renforcé par des fibres
EP3719078A1 (fr) 2017-11-29 2020-10-07 Teijin Limited Matériau composite, procédé de production d'un objet moulé et procédé de production de matériau composite
CN112011894A (zh) * 2020-09-04 2020-12-01 嘉兴学院 一种涤纶废丝的再生利用方法
JP2022149483A (ja) 2021-03-25 2022-10-07 東レ株式会社 短繊維強化プリプレグシートの製造方法

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