US20200324493A1 - Method of manufacturing a composite part comprising a core and at least one skin region - Google Patents

Method of manufacturing a composite part comprising a core and at least one skin region Download PDF

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Publication number
US20200324493A1
US20200324493A1 US16/753,975 US201816753975A US2020324493A1 US 20200324493 A1 US20200324493 A1 US 20200324493A1 US 201816753975 A US201816753975 A US 201816753975A US 2020324493 A1 US2020324493 A1 US 2020324493A1
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Prior art keywords
skin
core
polymer
core element
thermoplastic
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US16/753,975
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English (en)
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Burak Baser
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Mitsubishi Chemical Advanced Materials Composites AG
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Mitsubishi Chemical Advanced Materials Composites AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/12—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/84—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks by moulding material on preformed parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B29C2043/189—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the parts being joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/52—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/465—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating by melting a solid material, e.g. sheets, powders of 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
    • B29K2101/12—Thermoplastic materials
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules
    • 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
    • B29K2223/00—Use of polyalkenes or derivatives thereof as reinforcement
    • B29K2223/10—Polymers of propylene
    • B29K2223/12—PP, i.e. polypropylene
    • 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
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/12—Thermoplastic materials
    • 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
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/08—Glass
    • 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
    • B29K2823/00—Use of polyalkenes or derivatives thereof as mould material
    • B29K2823/04—Polymers of ethylene
    • B29K2823/06—PE, i.e. polyethylene
    • B29K2823/0658—PE, i.e. polyethylene characterised by its molecular weight
    • B29K2823/0683—UHMWPE, i.e. ultra high molecular weight polyethylene

Definitions

  • the present invention relates to a novel method of manufacturing a composite part comprising a core and at least one skin region formed of a skin thermoplastic polymer attached thereto. Moreover, the invention relates to a composite part comprising a core element and at least one skin region formed of a skin thermoplastic polymer attached thereto.
  • Ultra high molecular weight polyethylene also known as “UHMWPE”, on the other hand, is an exceptionally strong and durable polymer totally unlike its poorer relatives.
  • UHMWPE is prepared by special polymerization processes in which the polyethylene chains acquire an exceptionally high molecular weight, typically having number average molecular weights of from 1.5 ⁇ 10 6 to 1 ⁇ 10 7 daltons, supplied as a resin powder. It is their very long polymer chains which make these polymers unique. However, this same feature is also the cause of major processing problems. While ordinary polyethylene even including polyethylene of very high molecular weight can be melt extruded, attempts to melt extrude UHMWPE have been largely unsuccessful, despite much research in this area. Virtually all UHMWPE products are produced by compression molding or ram extrusion. As indicated by U.S. Pat. No. 5,286,576, processing methods applicable to conventional thermo-plastics, such as continuous extrusion, calendaring, and injection molding, are generally inapplicable to UHMWPE.
  • UHMWPE powder is introduced into a coffin-like mold of very thick section.
  • a thick cover which fits within the mold cavity is then placed on top of the powder, and the whole assembly is heated to above the crystalline melt temperature while being compressed to very high pressure.
  • the molds are then slowly and uniformly cooled, and the product, generally in the form of a thick slab, is demolded.
  • compression molding is a cost-intensive and labor intensive method of producing UHMWPE products. However, it is essentially the only process which can be used to make panels or sheets of large width, and is thus still a much used process.
  • UHWMPE In contrast to the high wear resistance and excellent sliding properties resulting from its very low friction coefficient, UHWMPE has low stiffness with an E-modulus typically ranging from 500 to 1′000 MPa. Accordingly, UHMWPE cannot be used integrally as structural parts and needs to be applied as lining. In other words, structural parts are built starting from a mechanically performant structure made e.g. of steel, wood or other polymers, which is then lined with UHMWPE in a secondary operation.
  • UHMWPE cannot be reinforced simply by incorporating reinforcement fibers, since adhesion of UHMWPE to reinforcement fibers is very poor.
  • a method of manufacturing a composite part comprising a core and at least one skin region formed of a skin polymer attached thereto, the skin polymer being a low surface energy thermoplastic polymer, the method comprising the following steps:
  • a composite part comprising a core and at least one skin region formed of a skin polymer attached thereto, the skin polymer being a low surface energy thermoplastic polymer, the core element having a surface with at least one contacting region provided with a plurality of anchoring sites and the skin region being mechanically engaged into the anchoring sites of the core element, the skin region having a thickness of 0.5 to 10 mm.
  • the method allows production of lightweight composite parts with excellent surface properties of the skin region.
  • the term “low surface energy thermoplastic polymer” shall be understood as a polymer having very poor adhesion to reinforcement fibers (e.g. to glass-, carbon- or aramid fibers), especially UHMWPE, polytetrafluorethylene (PTFE), polyvinylidene fluoride (PVDF) and polychlorotrifluoroethylene (PCFTE) so that fiber reinforcement is provided by using a fiber reinforced core with different polymer having sufficient adhesion to the fibers and thus providing high mechanical performance.
  • PTFE polytetrafluorethylene
  • PVDF polyvinylidene fluoride
  • PCFTE polychlorotrifluoroethylene
  • mold with a heatable mold cavity shall be understood in its broadest sense as generally used in the field of thermoplastic processing.
  • the mold may be a non-structured mold with two cooperating, substantially planar or slightly bent mold surfaces.
  • Horizontally closing molds will be preferable for the reasons explained below, but this shall not exclude the use of vertically closing molds in principle.
  • the dimensions of the core element and the amount of skin polymer to be loaded into the mold cavity shall reasonably match the dimensions of the mold cavity so as to allow carrying out the heat pressing step and providing the required reinforcement.
  • the core element to be provided with the skin region shall have on its outer surface at least one contacting region provided with a plurality of anchoring sites.
  • the latter are intended to provide a mechanical anchoring or gripping engagement zone for the skin polymer.
  • the latter is supplied in powder form, and for a good result it will be necessary to ensure that all of the contacting zones are sufficiently contacted with the powder.
  • the skin polymer powder shall penetrate into any cavities defined by the anchoring sites as uniformly and thoroughly as possible. For this purpose, it may be appropriate to apply a vibrating or shaking motion to the filled mold.
  • loading of the mold cavity before carrying out the heat pressing step may include any of the following steps:
  • An “appropriate amount” of skin polymer powder is an amount that allows formation of a molten skin layer with a predetermined thickness.
  • the molten skin polymer matrix is caused to solidify. Any parts of the matrix that had penetrated into cavities and recesses of the core element will then be mechanically engaged and thus provide the desired anchoring of the skin region and the core.
  • the term “core element” will be used for the initial structure that is placed into the mold cavity.
  • the heat pressing step will or will not lead to a change of the core element's properties and shape.
  • the core element comprises some type of thermoplastic polymer, henceforth called “core thermoplastic polymer”
  • the heat pressing will lead to a melting and rearrangement not only of the skin polymer, but also of the core element.
  • the term “core” will generally be used for the region that was originally the core element before the heat pressing treatment.
  • the core may be substantially identical to the core element or it may be a somehow re-shaped version of the original core element.
  • the core element shall be of a material and configuration in which the polymer chains are not degraded by the conditions prevailing during the heat pressing step.
  • core element also includes the possibilities of multiple core elements arranged either co-planarly or in a stacked manner. In the latter case, the so-called skin region may extend to regions between stacked core elements.
  • skin shall be understood in its broadest terms as referring to a surface layer attached to an inner or core structure.
  • the layer of skin polymer is applied to one face of the core element, i.e. either above or below the core element.
  • a horizontally closing mold is advantageous.
  • the layer of skin polymer powder is applied patchwise.
  • an entire face or even the entire surface of the core element may be configured as a contacting region, in which case the patchwise skin configuration will be determined by appropriately localized application of skin polymer.
  • the core element is formed of a thermoplastic fleece with reinforcement fibers, wherein the thermoplastic fleece consists of a core thermoplastic polymer.
  • Fiber reinforced thermoplastic fleece materials are widely used in manifold technical areas, particularly for producing lightweight form parts with advantageous structural properties.
  • the thermoplastic fleece and—depending on type—also the reinforcement fibers incorporated therein, provide an irregular surface region with protruding thermoplastic and/or reinforcement fiber portions and open or cavernous regions therebetween.
  • the protruding portions can be end portions of thermoplastic or reinforcement fibers, but they can also be loop like protrusion sections of a long fiber element.
  • the core thermoplastic polymer can be selected from a variety of known polymers such as e.g. polyamide (PA), polypropylene (PP), polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK)
  • PA polyamide
  • PP polypropylene
  • PPS polyphenylene sulfide
  • PEI polyetherimide
  • PEEK polyetheretherketone
  • the melting temperature of the core thermoplastic polymer should be sufficiently low so that the press heating, which is conducted at temperature adapted to the skin polymer, leads to melting of the core thermoplastic polymer.
  • suitable core polymers appear to be e.g. PPS, PEI and PEEK.
  • UHMWPE as skin polymer
  • the suitable core polymers notably include PP.
  • the core element formed of a thermoplastic fleece with reinforcement fibers may comprise structural reinforcement elements. Therefore, according to one embodiment (claim 9 ), the core element further comprises at least one reinforcement layer. In certain embodiments (claim 10 ), the reinforcement layer is selected from a fabric, a multiaxial stitch or unidirectional reinforcement.
  • the core element is formed as a solid or hollow body wherein the anchoring sites are configured as surface discontinuities such as recesses, rims or undercuts.
  • the size of such discontinuities shall be large enough to allow easy penetration by skin polymer powder dispersed thereon.
  • bodies suitable as core elements of the present invention are simple plates or rods, but also hollow profiles such as tubes.
  • the anchoring sites may be formed by appropriate surface treatment, which can include sand or glass bead blasting.
  • additional anchoring may be provided by applying a suitable coupling agent, e.g. a thin layer of olefin based adhesive, onto the surface of the core element.
  • FIGS. 5 to 7 shows vertical section views of further embodiments of the composite part
  • FIG. 8 shows a photographic reproduction of one embodiment of the composite part
  • FIG. 9 shows an enlarged section (micrograph) of an edge region of the composite part of FIG. 8 .
  • UHMWPE was used as skin polymer
  • polypropylene was used as core thermoplastic polymer
  • glass fibers were used as reinforcement fibers.
  • other suitable materials may be chosen.
  • the temperature and possibly also the pressure applied in the heat pressing step may have to be adapted. For this purpose it may be appropriate to conduct a small series of test runs systematically changing temperature and pressure.
  • a first layer 2 of approximately 2 mm of UHMWPE in powder form is uniformly distributed on a lower mold plate 4 of a heatable mold cavity (not shown).
  • a core element 6 formed of a lofty mat comprising a thermoplastic fleece 8 containing reinforcement fibers 10 , e.g. with 20 to 80% by weight of randomly oriented polypropylene (PP) fibers and 80 to 20% by weight of glass fibers is placed onto the first layer 2 of skin polymer powder.
  • second layer 12 of approximately 2 mm of UHMWPE in powder form is uniformly distributed onto the top of the core element 6 .
  • FIG. 1 b at this point a fraction of the skin polymer powder has penetrated into interstitial regions between the various PP and glass fibers in the regions near the surface of the core element.
  • the stacked arrangement thus prepared is then subjected to a heat pressing step by driving an upper mold plate 14 against lower mold plate 4 under appropriate heating.
  • the UHMWPE powder is driven further into the core element and is caused to melt; simultaneously, the PP fibers of the core element are caused to also melt and the lofty fiber arrangement is compressed to some extent.
  • the resulting composite part comprises a central core 16 made up of glass fibers 10 and a solid PP core matrix 18 , which is stacked between a lower skin 20 and an upper skin 22 formed of a solid matrix of UWHMPE.
  • the boundary region between skin and core regions comprises an arrangement of geometrically intertwined regions of solidified PP, solidified UHMWPE and glass fiber portions, thus providing an strong mechanical coupling of the various layers.
  • the core element 6 contains, in addition of PP fibers 8 and glass fibers 10 , two internal reinforcement layers 24 a and 24 b.
  • These reinforcement layers can be formed, e.g., of a reinforcement fabric or a multi-axial or unidirectional reinforcement layer.
  • Such reinforcement layers are well known in the field of fiber reinforced thermoplastics. Alternatively, one could also use a plate-like solid element for reinforcement.
  • the heat pressing step leads to formation of a composite part, wherein the core 16 now contains the reinforcement layers 24 a and 24 b.
  • the core 16 now contains the reinforcement layers 24 a and 24 b.
  • molten PP is driven into recesses and cavities of the reinforcement element and provides mechanical connection to the core matrix.
  • the example of FIG. 3 only differs from the example of FIG. 3 in that the upper skin 22 does not cover the entire uppers surface of core 16 . Accordingly, the upper layer of UHMWPE powder is only applied as a patch 12 a covering a part of the core element, and correspondingly, the upper skin is formed as a skin patch 22 a.
  • the core element 6 is constituted of a plate element 26 provided with a plurality of vertical passages 28 and a plurality of horizontal recesses 30 disposed in the lateral plate surface.
  • the core element 6 is placed thereon and then further UHMWPE powder is applied taking care to fill the vertical passages 28 and the horizontal recesses 30 and also forming an upper UHMWPE layer 12 .
  • a composite part as shown if FIG. 5 c is formed.
  • a UHMWPE skin 32 completely surrounds the solid core 16 , which is essentially identical to the originally inserted core element 6 .
  • Anchoring of the UHWMPE skin 32 to the core 16 is provided by the geometric structure formed by the vertical passages 28 and horizontal recesses 30 .
  • FIG. 5 just shows one example of a composite part with a patchy UHMWPE skin, which can be shaped e.g. to provide low friction at selected, exposed regions 22 a of the composite part.
  • a substantially solid core 16 with appropriate horizontal recesses 30 and vertical undercuts 34 can optionally contain an additional functional element 36 .
  • the core 16 can be formed of a plurality of tubular elements 38 arranged substantially along a principal plane of the composite part. Mechanical anchoring between the skin matrix and the core is provided to some extent by the geometric arrangement of tubular elements 38 . Nevertheless, it may be appropriate to provide further anchoring by applying a suitable adhesive on the surface of the tubular elements.
  • the composite part illustrated in FIGS. 8 and 9 comprises an upper UHMWPE skin layer and a bottom UHMWPE skin layer each consolidated to a skin thickness of about 2 mm.
  • the core layer comprises an upper and a lower PP-GF fleece with approximately 50% GF content and each about 1 mm thick, and a stack of reinforcement PP-GF fabric layers sandwiched therebetween.
  • a heat pressing was carried out starting from 25° C. and rising up to 200° C. under 20 bar pressure, After reaching 200° C. the pressure and temperature were maintained for 10 min, followed by a cooling from 200° C. to 70° C. still under 20 bar pressure.
  • the UHMWPE skin bottom part of FIG. 9

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Textile Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Laminated Bodies (AREA)
US16/753,975 2017-10-06 2018-10-08 Method of manufacturing a composite part comprising a core and at least one skin region Abandoned US20200324493A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP17195107.2 2017-10-06
EP17195107.2A EP3466634A1 (fr) 2017-10-06 2017-10-06 Procédé de fabrication d'une pièce composite comprenant un noyau et au moins une région de la peau
PCT/EP2018/077371 WO2019068939A1 (fr) 2017-10-06 2018-10-08 Procédé de fabrication d'une pièce composite comprenant un noyau et au moins une région de peau

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/077371 A-371-Of-International WO2019068939A1 (fr) 2017-10-06 2018-10-08 Procédé de fabrication d'une pièce composite comprenant un noyau et au moins une région de peau

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US18/319,562 Continuation US20230286224A1 (en) 2017-10-06 2023-05-18 Method of manufacturing a composite part comprising a core and at least one skin region

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US20200324493A1 true US20200324493A1 (en) 2020-10-15

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US18/319,562 Pending US20230286224A1 (en) 2017-10-06 2023-05-18 Method of manufacturing a composite part comprising a core and at least one skin region

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WO2019068939A1 (fr) 2019-04-11
CN111542423A (zh) 2020-08-14
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CN111542423B (zh) 2023-06-09
US20230286224A1 (en) 2023-09-14
JP7425723B2 (ja) 2024-01-31
JP2020535995A (ja) 2020-12-10

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