# US 10,308,000 B2 · Method for pre-preg manufacturing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,308,000 B2 - Document ID: US10308000B2 - Status: Granted - Kind: B2 - Application number: 15/163,180 - Filed: 2016-05-24 - Published: 2017-11-30 - Granted: 2019-06-04 - Earliest claimed: 2016-05-24 - Assignees: The Boeing Company - Applicants: The Boeing Company - Inventors: Hardik Dalal; Alain A. Adjorlolo; Adam F. Gross; Elena M. Sherman; John J. Vajo; Andrew P. Nowak; Brad Andrew Coxon; Kurtis Willden; Daniel M. Rotter; Stephen Lee Metschan; Berryinne Decker - Web page: https://patentgrep.com/patent/US10308000B2 ## CPC - B32B 37/02: characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations - B29C 33/68: Release sheets - B29C 37/0075: {using release sheets} - B29C 70/541: {Positioning reinforcements in a mould, e.g. using clamping means for the reinforcement (positioning inserts in moulds B29C33/12; lay-up on a mould B29C70/30)} - B29C 70/543: {Fixing the position or configuration of fibrous reinforcements before or during moulding (for non-woven fabrics D04H3/08)} - B32B 2327/00: Polyvinylhalogenides - B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - 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 (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) ## Abstract A method of making a composite part comprises covering a mold tool for a composite part with a parting film, the parting film comprising a polymer sheet and a pressure sensitive adhesive. The parting film is positioned so that the polymer sheet is between the mold tool and the pressure sensitive adhesive. At least one layer of pre-preg is layed up on the parting film covering the mold tool to form a layed-up composite part. The pre-preg comprises an adhesive. The layed-up composite part is removed from the parting film. ## Claims ### Claim 1 A method of making a plurality of composite parts, the method comprising: covering a mold tool for a composite part with a parting film, the parting film comprising a polymer sheet and a pressure sensitive adhesive, the parting film being positioned so that the polymer sheet is between the mold tool and the pressure sensitive adhesive; forming a first composite part by carrying out (i) a laying up process comprising laying up at least one layer of pre-preg on the parting film covering the mold tool to form the first composite part, the pre-preg comprising an adhesive; and (ii) removing the first composite part from the parting film; and repeating (i) and (ii) to form an additional composite part, the first composite part and the additional composite part being formed without removing the parting film from the mold tool. ### Claim 2 (depends on 1) The method of claim 1, wherein the laying up process and the removing are carried out 5 to 50 times without removing the parting film from the mold tool. ### Claim 3 (depends on 1) The method of claim 1, wherein the pressure sensitive adhesive adheres to the at least one layer of pre-preg while laying up occurs, the pressure sensitive adhesive releasing the first composite part during the removing of the first composite part from the mold tool. ### Claim 4 (depends on 1) The method of claim 1, wherein the polymer sheet comprises a material chosen from polymers of polyethylene, polyethylene terephthalate (“PET”), fluorinated ethylene propylene (“FEP”), nylon and combinations thereof. ### Claim 5 (depends on 1) The method of claim 1, wherein the polymer sheet is a Corona-treated polymer sheet to improve adhesion. ### Claim 6 (depends on 1) The method of claim 1, wherein the pressure sensitive adhesive has an elasticity ranging from 50% to 1000%. ### Claim 7 (depends on 1) The method of claim 1, wherein the pressure sensitive adhesive comprises a material chosen from adhesives of acrylic resin, polyurethane, rubber, styrene-butadiene-styrene copolymer, ethylene vinyl acetate, styrene block copolymers and combinations thereof. ### Claim 8 (depends on 1) The method of claim 1, wherein the pressure sensitive adhesive comprises a material chosen from adhesives of styrene-butadiene-styrene block copolymers, styrene-butadiene-styrene random copolymers and combinations thereof. ### Claim 9 (depends on 1) The method of claim 1, wherein the pressure sensitive adhesive has a mass average molecular weight of about 70,000 g/mol to about 1,500,000 g/mol. ### Claim 10 (depends on 1) The method of claim 1, wherein the pressure sensitive adhesive comprises a block copolymer having a first block and a second block, the first block having a glass transition temperature of less than 20° C. and the second block having a glass transition temperature of greater than 20° C. ### Claim 11 (depends on 1) The method of claim 1, wherein removing the first composite part is performed with a tool that adheres to the pre-preg more strongly than the pressure sensitive adhesive of the parting film. ### Claim 12 (depends on 11) The method of claim 11, wherein the tool is a vacuum chuck. ### Claim 13 (depends on 11) The method of claim 11, wherein the tool comprises an adhesive that adheres to the pre-preg. ### Claim 14 (depends on 1) The method of claim 1, wherein a surface of the first composite part contacts the parting film during laying up of the pre-preg, and less than 10 micrograms/cm2 of the pressure sensitive adhesive remain on the surface of the first composite part after removing the first composite part from the parting film. ### Claim 15 A method of making a plurality of composite parts, the method comprising: covering a mold tool for a composite part with a parting film, the parting film comprising a polymer sheet and a pressure sensitive adhesive, the parting film being positioned so that the polymer sheet is between the mold tool and the pressure sensitive adhesive; forming a first composite part by carrying out (i) a laying up process comprising laying up at least one layer of pre-preg on the parting film covering the mold tool to form the first composite part, the pre-preg comprising an adhesive; and (ii) removing the first composite part from the parting film; and repeating (i) and (ii) to form an additional composite part, the first composite part and the additional composite part being formed without removing the parting film from the mold tool, wherein the pressure sensitive adhesive comprises a material chosen from adhesives of acrylic resin, polyurethane, rubber, styrene-butadiene-styrene copolymer, ethylene vinyl acetate, styrene block copolymers, and combinations thereof. ### Claim 16 (depends on 15) The method of claim 15, wherein the polymer sheet comprises a material chosen from polymers of polyethylene, polyethylene terephthalate (“PET”), fluorinated ethylene propylene (“FEP”), nylon and combinations thereof. ### Claim 17 (depends on 15) The method of claim 15, wherein the polymer sheet is a Corona-treated polymer sheet to improve adhesion. ### Claim 18 (depends on 15) The method of claim 15, wherein the pressure sensitive adhesive has an elasticity ranging from 50% to 1000%. ### Claim 19 (depends on 15) The method of claim 15, wherein the pressure sensitive adhesive comprises a material chosen from adhesives of styrene-butadiene-styrene block copolymers, styrene-butadiene-styrene random copolymers and combinations thereof. ### Claim 20 (depends on 15) The method of claim 15, wherein the pressure sensitive adhesive has a mass average molecular weight of about 70,000 g/mol to about 1,500,000 g/mol. ### Claim 21 (depends on 15) The method of claim 15, wherein the pressure sensitive adhesive comprises a block copolymer having a first block and a second block, the first block having a glass transition temperature of less than 20° C. and the second block having a glass transition temperature of greater than 20° C.