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WO2005118264A1 - Sac sous vide réutilisable sans joint - Google Patents

Sac sous vide réutilisable sans joint Download PDF

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Publication number
WO2005118264A1
WO2005118264A1 PCT/US2004/017353 US2004017353W WO2005118264A1 WO 2005118264 A1 WO2005118264 A1 WO 2005118264A1 US 2004017353 W US2004017353 W US 2004017353W WO 2005118264 A1 WO2005118264 A1 WO 2005118264A1
Authority
WO
WIPO (PCT)
Prior art keywords
vacuum bag
fluoroelastomeric
strip
reusable vacuum
forming tool
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/US2004/017353
Other languages
English (en)
Inventor
John Potter
William Mead
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northrop Grumman Corp
Original Assignee
Northrop Grumman 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 Northrop Grumman Corp filed Critical Northrop Grumman Corp
Priority to PCT/US2004/017353 priority Critical patent/WO2005118264A1/fr
Publication of WO2005118264A1 publication Critical patent/WO2005118264A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • 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
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/544—Details of vacuum bags, e.g. materials or shape

Definitions

  • the present invention relates generally to vacuum bags and, more particularly, to an improved reusable vacuum bag configured for application of at least one sealant bead for sealing the reusable vacuum bag to a forming tool during fabrication of a composite part on the forming tool.
  • the production of composite parts requires the application of pressure onto a composite part against a forming tool.
  • the vacuum bag is used for debulking the composite part such that wrinkles and trapped air in the composite part may be forced out under vacuum pressure.
  • the vacuum bag is also utilized to hold the composite part against the forming tool while uncured resin is impregnated therein by vacuum pressure.
  • the vacuum bag is further used for curing the resin in the composite part in an autoclave or in an oven at elevated temperature and pressure.
  • a common vacuum bag material is nylon.
  • nylon vacuum bags are desirable as the thin nylon film can be laid over the composite part on the forming tool. The nylon film can then be hand conformed to the small inside radii of the forming tool.
  • nylon loses considerable resiliency after a single use in an autoclave and therefore cannot be reused to fabricate another composite part.
  • composite parts fabricated using nylon vacuum bags may exhibit flaws in that wrinkles and pinholes may appear due to the bunching up of the nylon film against the forming tool under vacuum pressure. Leakage of the seal between the vacuum bag and the forming tool has also limited production of composite from nylon vacuum bags.
  • silicone rubber has been utilized to fabricate vacuum bags because it has an elongation of over 500% which allows it to stretch over small radii on forming tools.
  • silicone rubber has a maximum exposure temperature of 500° F which allows for greater curing cycle flexibility.
  • silicone rubber retains its resiliency over many autoclave cycles and is therefore suitable as a reusable vacuum bag material.
  • the seal between the vacuum bag and the forming tool is critical in the quality of the resulting composite part as any loss of uniform vacuum pressure adversely affects the quality of the cured part.
  • Common sealing techniques include the use of clamps located at the bag border. However, their use is cumbersome and the seal is not always reliable. Magnets may also be spaced around the bag border.
  • magnets are only practical for use with relatively flat steel forming tools, and are not useful in border areas on non-steel tools.
  • Mechanical seals such as channels, grooves and keys formed in the base plate of the forming tool may work reasonably well for composite parts with relatively large curvatures.
  • mechanical seals cannot be used for forming tools having small inside and outside radii.
  • Zinc chromate sealant tape is one such sealant tape that is widely used in composite part manufacturing. Zinc chromate sealant tape is not limited by the material of the forming tool as it adheres to both metallic and composite forming tools. However, a principal limitation in the use of silicone rubber for reusable vacuum bags is that standard sealant tapes do not readily adhere to silicone rubber due to the inherently natural lubricity of silicone. Although commercial sealants, including zinc chromate sealant tape, adhere to and cleanly remove from metal or composite forming tools after use, these commercial sealants do not adhere to silicone rubber.
  • VACUUM BAG FOR DEBULKING AND AUTOCLAVING LAMINATES OF COMPLEX SHAPES describes a silicone rubber vacuum bag assembly which can be used repeatedly to debulk and autoclave composite layups.
  • the bags are formed of a single layup of uncured silicone rubber over a forming tool. Portions of the bag which may overlay recesses and female radii are removed.
  • the silicone rubber is vacuum bagged in a nylon bag and cured in an autoclave. The recesses are then filled with uncured silicone rubber followed by a second cure period. After removal of the nylon bag from the forming tool, each of the vacuum bag assemblies is postcured to stabilize and preshrink the silicone rubber.
  • the vacuum bag assembly may be bonded to a frame for sealing to the forming tool.
  • a strip of adhesive tape commercially available as Mosites #14206 from the Mosites Rubber Company, is adhered to each strip of silicone elastomeric material.
  • Mosites sealant tape would not be applicable for use on complex contoured forming because wrinkling of the tape will occur when applied to small radii, resulting in leakage during vacuum pull.
  • a reusable vacuum bag for forming composite parts having small radii of curvature.
  • a reusable vacuum bag that can be effectively sealed to a forming tool to hold a vacuum during autoclaving.
  • a reusable vacuum bag to which commercially available sealant tape may be adhered and which has higher resistance to tears during use.
  • the present invention specifically addresses and alleviates the above referenced deficiencies associated with the sealing of reusable vacuum bags to a forming tool. More particularly, the present invention is an improved border configuration for sealing a reusable vacuum bag to a forming tool and a method of fabricating the reusable vacuum bag.
  • the reusable vacuum bag of the present invention differs from reusable vacuum bags of the prior art in that it utilizes a fluoroelastomeric strip for sealing the reusable vacuum bag to the forming tool with commercially available sealant tape.
  • the reusable vacuum bag of the present invention provides improved tack and adhesion to sealant tape, thus allowing for a vacuum tight seal to the forming tool.
  • a reusable vacuum bag that is configured for the application of a sealant bead for vacuum tight sealing of the reusable vacuum bag to a forming tool.
  • the forming tool has a contoured surface incorporating the desired shape of the composite part to be formed.
  • the forming tool perimeter may be a generally flat or contoured surface to which the reusable vacuum bag is sealed for debulking or autoclaving operations.
  • the reusable vacuum bag is comprised of at least one elastomeric layer and a fluoroelastomeric strip.
  • the elastomeric layer may be formed of silicone rubber provided in either a cured or uncured state.
  • the elastomeric layer is sealable against the forming tool and transmits autoclave pressure to the composite part when a vacuum is drawn thereagainst.
  • the reusable vacuum bag may include a release layer disposed on the surface of the composite part on the side opposite the forming tool to allow detaching of the composite part from the forming tool after autoclaving.
  • the reusable vacuum bag may also include a breather layer disposed on the surface of the release layer on the side opposite the composite part. The breather layer may have exposed interstices for drawing a vacuum between the reusable vacuum bag and the forming tool and to allow passage of gas volatiles that may be generated by the composite part as it cures during curing.
  • the elastomeric layer has a sealing flange extending peripherally thereabout.
  • the fluoroelastomeric strip extends substantially along the sealing flange and has first and second surfaces.
  • Mosites #10320-C manufactured by the Mosites Rubber Company of Fort Worth, Texas, is a fluorinated synthetic rubber which is chemically inert and which thus has excellent resistance to attack from sealant tape tacifiers with no substantial degradation in its mechanical properties even after repeated contact with tacifiers.
  • the high resistance to attack from tacifiers is due in part to its relatively high fluorine content of 70%.
  • commercial sealant tapes readily adhere to Mosites #10320-C.
  • the elastomeric layer and the fluoroelastomeric strip may each include polymers and a peroxide curative.
  • the peroxide curatives initiate vulcanization wherein the polymers of each material cross-link at an elevated temperature to form double-oxygen bonds such that a permanent bond is formed between the sealing flange and the fluoroelastomeric strip at the first surface.
  • Mosites #10320-C can be permanently bonded to Mosites #10320-C due in part to the peroxide curative contained within the #10320-C compound.
  • the fluoroelastomeric strip is releaseably adhered at the second surface to the sealant bead.
  • the reusable vacuum bag may be fabricated by providing the elastomeric layer having a sealing flange, and covering the forming tool with the elastomeric layer.
  • a fluoroelastomeric strip is positioned between the sealing flange and the forming tool such that the fluoroelastomeric strip is substantially aligned along the sealing flange.
  • the forming tool may be overlaid with a model part prior to covering with the elastomeric layer to compensate for the thickness of the composite part.
  • Such a model part would be preformed and would have the same thickness and geometric features of the composite part. If the laminate thickness is small and the lateral geometric features are not too large, the model part need not be incorporated into the process for fabricating the reusable vacuum bag.
  • the reusable vacuum bag overlaying the forming tool is then vacuum bagged with a nylon bag using conventional bagging techniques.
  • the reusable vacuum bag is then cured by placing in an autoclave or oven at elevated temperature and pressure. After curing, the nylon bag and the reusable vacuum bag are removed from the forming tool.
  • the reusable vacuum bag is stabilized by postcuring in an oven at ambient pressure and elevated temperature in order to minimize further shrinkage of the reusable vacuum bag.
  • Fig. 1 is a broken away perspective view of a composite part formed on a forming tool utilizing a reusable vacuum bag of the present invention
  • Fig. 2 is an enlarged partial longitudinal sectional view taken along line 2-2 of Fig. 1 illustrating the arrangement of the layers that make up the reusable vacuum bag of the present invention
  • Fig. 3 is an enlarged longitudinal sectional view taken from Fig. 2 illustrating the detail of the sealing flange and the arrangement of a sealant bead with the forming tool
  • Fig. 1 is a broken away perspective view of a composite part formed on a forming tool utilizing a reusable vacuum bag of the present invention
  • Fig. 2 is an enlarged partial longitudinal sectional view taken along line 2-2 of Fig. 1 illustrating the arrangement of the layers that make up the reusable vacuum bag of the present invention
  • Fig. 3 is an enlarged longitudinal sectional view taken from Fig. 2 illustrating the detail of the sealing flange and the arrangement of a sealant bead with the forming tool
  • FIG. 4 is an enlarged longitudinal sectional view of a reusable vacuum bag of the prior art illustrating the arrangement of the sealing flange with the sealant bead;
  • Fig. 5 is a broken away perspective view of the forming tool and the reusable vacuum bag during fabrication thereof; and
  • Fig. 6 is an enlarged partial longitudinal sectional view taken along line 6-6 of Fig. 5 illustrating the detail of the sealing flange during fabrication of the reusable vacuum bag.
  • Fig. 1 illustrates a composite part 18 formed on a forming tool 16 utilizing a reusable vacuum bag 10 of the present invention.
  • Fig. 1 illustrates a composite part 18 formed on a forming tool 16 utilizing a reusable vacuum bag 10 of the present invention.
  • Fig. 1 illustrates a composite part 18 formed on a forming tool 16 utilizing a reusable vacuum bag 10 of the present invention.
  • Fig. 1 illustrates a composite part 18 formed on a forming tool 16 utilizing a reusable vacuum bag 10 of the present invention.
  • the forming tool 16 is shown having a contoured surface incorporating the desired shape of the composite part 18 to be formed.
  • the forming tool 16 perimeter may be a flat or a contoured surface to which the reusable vacuum bag 10 is sealed during preparation of the composite part 18, shown in Fig. 1, for debulking or curing.
  • Composite part 18 material is typically comprised of sheets or plies of woven or unidirectional filamentary material. The plies are laid over the forming tool 16. The plies are generally pre-impregnated with resin and are then placed on the forming tool 16. A vacuum pressure is drawn on the plies and the forming tool 16 with the aid of the reusable vacuum bag 10.
  • the entire assembly of the forming tool 16, the composite part 18 and the reusable vacuum bag 10 is then placed in an autoclave in which the layup is finally cured through the application of further pressure at an elevated temperature. After removal from the autoclave and cooling down to room temperature, the reusable vacuum bag 10 and the composite part 18 are removed from the forming tool 16.
  • the reusable vacuum bag 10 of Fig. 1 is comprised of at least one elastomeric layer 20 and a fluoroelastomeric strip 24.
  • the elastomeric layer 20 is sealable to the forming tool 16. It is contemplated that there may be multiple elastomeric layers 20 that make up the reusable vacuum bag 10.
  • the elastomeric layer 20 may be formed of silicone rubber which may be provided in either a cured or uncured state.
  • the silicone rubber may have a thickness of from about .030 inches to about .120 inches, although the thickness of the silicone rubber may be of a thickness outside such a range depending on other variables such as the relative radii of curvature in the forming tool 16 and the overall size of the forming tool 16. It is further contemplated that the elastomeric layer 20 may have variable thicknesses at different sections on the reusable vacuum bag 10. For example, in sections where the reusable vacuum bag 10 traverses small male or female radii of the forming tool 16, the elastomeric layer 20 may be thinner to allow the reusable vacuum bag 10 to more readily stretch and conform the composite part 18 to the forming tool 16.
  • the elastomeric layer 20 may be thicker.
  • the elastomeric layer 20 transmits autoclave pressure to the composite part 18 when a vacuum is drawn thereagainst.
  • the reusable vacuum bag 10 is configured for application of at least one sealant bead 14, shown in Figs. 1 and 2 and described in more detail below.
  • Fig. 2 is an enlarged partial longitudinal sectional view taken along line 2-2 of Fig. 1 illustrating the arrangement of the layers that make up the reusable vacuum bag 10.
  • the reusable vacuum bag 10 may further include at least one release layer 32, shown in Fig. 2, disposed on the surface of the composite part 18 on the side opposite the forming tool 16.
  • the release layer 32 may provide release properties to the reusable vacuum bag 10 such that the reusable vacuum bag 10 is detachable from the composite part 18 after autoclaving.
  • the release layer 32 may be fluorinated ethylene propylene material or it may be a TEFLON release film or a TEFLON coated fabric.
  • the reusable vacuum bag 10 may also include a breather layer 34, also shown in Fig. 2, disposed on the surface of the release layer 32 on the side opposite the composite part 18.
  • the breather layer 34 may have exposed interstices 36 for drawing a vacuum between the reusable vacuum bag 10 and the forming tool 16. Such interstices 36 may allow passage of gas volatiles that may be generated by the composite part 18 as it cures during autoclaving.
  • the breather lay 34 may be fabricated of a woven material.
  • the breather layer 34 may also be fabricated from non-woven polyester or nylon fiber material.
  • FIG. 4 is an enlarged longitudinal sectional view of a reusable vacuum bag 10 of the prior art illustrating the arrangement of the sealing flange 22 with the sealant bead 14.
  • the sealing flange 22, also shown in Figs. 1 and 2 extends peripherally about the elastomeric layer 20. It is contemplated that the sealing flange 22 may have a width in a range of from about 14 inch to about 3 inches, although the width of the sealing flange 22 may fall outside of this range.
  • the sealing flange 22 of the present invention includes the fluoroelastomeric strip 24 extending substantially along the sealing flange 22, as shown in Fig. 3.
  • the sealant bead 14 is applied between the sealing flange 22 and the fluoroelastomeric strip 24 for sealing the fluoroelastomeric strip 24 to the forming tool 1 .
  • the sealant bead 14 provides vacuum tight sealing of the reusable vacuum bag 10 to the forming tool 16 during debulking and autoclave curing of the composite part 18.
  • the fluoroelastomeric strip 24 is also shown in Fig. 3 having first and second surfaces 26, 28 with the first surface 26 thereof disposed against the sealing flange 22.
  • the elastomeric layer 20 and the fluoroelastomeric strip 24 each have polymers.
  • the polymers of the elastomeric layer 20 cross-link with the polymers of the fluoroelastomeric strip 24 at an elevated temperature typical of autoclaves and ovens.
  • the cross- linking of the polymers may be such that a permanent bond is formed between the sealing flange 22 and the fluoroelastomeric strip 24 at the first surface 26.
  • the elastomeric layer 20 and the fluoroelastomeric strip 24 may both include a peroxide curative that initiates vulcanization of the fluoroelastomeric strip 24 to the elastomeric layer 20 at an elevated temperature to form a permanent bond therebetween.
  • the sealant bead 14 disposed between the elastomeric layer 20 and the fluoroelastomeric strip 24.
  • the sealant bead 14 may include tacifiers therein.
  • the tacifiers may provide adhesion between the sealant bead 14 and the fluoroelastomeric strip 24.
  • fluoroelastomeric material adheres to commercial sealant tapes.
  • Commercial sealant tapes such as zinc chromate sealant tape also contain vulcanizing curatives.
  • the curatives in the sealant tape allow the sealant bead 14 to vulcanize at an elevated temperature, resulting in cross-linking within the sealant tape material itself and subsequent hardening or thermosetting of the sealant bead 14.
  • Such a hardening of the sealant bead 14 is desirable in that the hardened sealant bead 14 is easily removable with little or no residue from both the forming tool 16 and the fluoroelastomeric strip 24 by rolling the tape back onto itself.
  • the vulcanized sealant bead 14 is not reusable and is discarded. In comparison, a sealant bead 14 that is not vulcanizing would retain its pre-autoclave, gummy consistency making removal from the sealing surface difficult and time-consuming.
  • fluoroelastomeric material has strength and tear resistance that is compatible for use with an elastomeric layer 20 formed of silicone rubber.
  • the semi-rigid nature of the fluoroelastomeric material enhances its conformability to forming tools 16 having complex curved surfaces with small inside or outside radii.
  • Mosites #10320-C manufactured by the Mosites Rubber Company of Fort Worth, Texas is a preferred material that may be utilized for forming the fluoroelastomeric strip 24.
  • the sealant bead is applied to the fluoroelastomeric strip.
  • the preferred fluoroelastomeric material has a fluorine content of 70%.
  • the high fluorine content in Mosites #10320-C provides a high degree of chemical inertness and resistance to degradation that may otherwise occur during exposure to volatiles created during the autoclaving process. Without resistance to attack from volatiles, tacifiers and acids, the mechanical properties of the sealing flange 22 would degrade after two or three autoclave cycles to a degree such that the vacuum bag would not be reusable.
  • the first surface 26 of the fluoroelastomeric strip 24 is bonded to the sealing flange 22.
  • the second surface 28 of the fluoroelastomeric strip 24 is releaseably adhered to the sealant bead 14.
  • a release agent 30 may be disposed between the sealant bead 14 and the second surface 28 of the fluoroelastomeric strip 24 to prevent permanent bonding therebetween during autoclaving.
  • the fluoroelastomeric strip 24 may be formed of fluorinated synthetic rubber, which may be uncured fluoroelastomeric rubber.
  • the fluoroelastomeric strip 24 may be formed of a material having a fluorine content of at least 70%.
  • Mosites #10320-C is a preferred fluoroelastomeric material that will form a permanent bond with an elastomeric layer 20 formed of silicone rubber. Referring to Fig. 5, the method of fabricating the reusable vacuum bag 10 will now be discussed. Fig.
  • the reusable vacuum bag 10 may be formed of at least one elastomeric layer 20, although multiple elastomeric layers 20 may make up the reusable vacuum bag 10.
  • the elastomeric layer 20 may be formed of cured or uncured silicone rubber and may have a thickness of from about .030 inches to about .120 inches, although the thickness of the silicone rubber may be variable at different sections of the reusable vacuum bag 10.
  • the reusable vacuum bag 10 is fabricated by providing the elastomeric layer
  • the fluoroelastomeric strip 24 may be formed of fluorinated synthetic rubber, which may be uncured fluoroelastomeric rubber. Additionally, the uncured fluoroelastomeric rubber may contain a peroxide curative for initiating vulcanization with the silicone rubber. As mentioned above, Mosites #10320-C is the preferred fluoroelastomeric material that will bond with the elastomeric layer 20 formed of silicone rubber due in part to its peroxide curative content.
  • Mosites #10320-C adheres to commercially available sealant tapes such as zinc chromate sealant tape while being chemically resistant to attack from tacifiers that may contact the fluoroelastomeric strip 24 during autoclaving.
  • the chemical resistance of Mosites #10320-C is due in part to its high fluorine content of 70%.
  • Fig. 6 shown is an enlarged partial longitudinal sectional view taken along line 6-6 of Fig. 5 illustrating the detail of the sealing flange 22 during fabrication of the reusable vacuum bag 10.
  • the forming tool 16 is covered with the elastomeric layer 20 such that the sealing flange 22 extends beyond the forming tool 16 perimeter to facilitate sealing of the reusable vacuum bag 10 to the forming tool 16.
  • Fig. 6 shown is an enlarged partial longitudinal sectional view taken along line 6-6 of Fig. 5 illustrating the detail of the sealing flange 22 during fabrication of the reusable vacuum bag 10.
  • the forming tool 16 is covered with the elastomeric layer 20 such that the sealing flange 22 extends beyond
  • the forming tool 16 may be overlaid with a model part 40 prior to covering with the elastomeric layer 20.
  • a model part 40 would be preformed and would have the same thickness and geometric features of the composite part 18 which is to be ultimately molded on the forming tool 16.
  • the use of the model part 40 depends to some degree on the thickness of the laminates. If the laminate thickness is small and the lateral geometric features are not too large, the model part 40 need not be incorporated into the process for fabricating the reusable vacuum bag 10.
  • the reusable vacuum bag 10 may be overlaid directly on the forming tool 16. Turning back to the description of the process for fabricating the reusable vacuum bag 10, the fluoroelastomeric strip 24 is provided having a shape substantially matching that of the sealing flange 22.
  • the fluoroelastomeric strip 24 is then positioned between the sealing flange 22 and the forming tool 16 such that the fluoroelastomeric strip 24 is substantially aligned along the sealing flange 22.
  • a nylon bag 38 is provided for vacuum bagging.
  • the combination of the forming tool 16 and the overlaying reusable vacuum bag 10 is then vacuum bagged with the nylon bag 38 using conventional bagging techniques.
  • the reusable vacuum bag 10 is then cured in an autoclave or oven at elevated temperature and pressure. After curing, the nylon bag 38 and the reusable vacuum bag 10 are removed from the forming tool 16. The nylon bag 38 is discarded and the reusable vacuum bag 10 is stabilized by postcuring in an oven at ambient pressure and elevated temperature greater than the curing temperature.
  • the elevated temperature during stabilization is set to be higher than any temperature to which the reusable vacuum bag 10 will be subjected during future debulking and autoclaving operations.
  • the elevated temperature used during the postcuring step may be about 50° higher than that used in the autoclaving step.
  • the stabilization step minimizes further shrinkage of the reusable vacuum bag 10 and stabilizes the shape of the reusable vacuum bag 10.
  • the second surface 28 may be lightly hand-abraded with 120-grit sandpaper by rubbing the second surface 28 for no more than one minute such that any sheen of the second surface 28 may be slightly dulled.
  • the release agent 30 may be applied to the fluoroelastomeric strip 24 after the stabilization step. Additional modifications and improvements of the present invention may also be apparent to those of ordinary skill in the art. Thus, the particular combination of parts described and illustrated herein is intended to represent only certain embodiments of the present invention, and is not intended to serve as limitations of alternative devices within the spirit and scope of the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

Un sac sous vide réutilisable (20) est configuré pour l'application d'un collier d'étanchéité (14) pour permettre une étroite étanchéité au vide du sac sous vide à un outil de formage (16) durant la fabrication d'une partie composite (18). Le sac sous vide comprend au moins une couche d'élastomère (20) et une bande fluoroélastomère (24). La couche d'élastomère peut être jointe à l'outil de formage et possède un bourrelet de joint (22) s'étendant tout autour de celui-ci. La bande fluoroélastomère s'étend nettement le long du bourrelet de joint et a une première et deuxième surfaces. La couche d'élastomère et la bande fluoroélastomère ont chacune des polymères et un traitement au peroxyde. Le traitement au peroxyde débute la vulcanisation quand les polymères de chaque matériau se lient à température élevée pour former des liaisons oxygènes doubles en ce qu'une liaison permanente est formée entre le bourrelet de joint et la bande fluoroélastomère à la première surface. La bande fluoroélastomère est attachée de façon amovible à la seconde surface du collier d'étanchéité.
PCT/US2004/017353 2004-06-01 2004-06-01 Sac sous vide réutilisable sans joint Ceased WO2005118264A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2004/017353 WO2005118264A1 (fr) 2004-06-01 2004-06-01 Sac sous vide réutilisable sans joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2004/017353 WO2005118264A1 (fr) 2004-06-01 2004-06-01 Sac sous vide réutilisable sans joint

Publications (1)

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WO2005118264A1 true WO2005118264A1 (fr) 2005-12-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009136845A1 (fr) * 2008-05-09 2009-11-12 Saab Ab Formage à chaud d'une tenture
GB2479463A (en) * 2010-04-08 2011-10-12 Gssc Inc Membrane seal in composite moulding
EP2821210A1 (fr) * 2013-07-02 2015-01-07 The Boeing Company Traitement sous vide de pièces composites à l'aide d'un ensemble formant un sac sous vide conformable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4681651A (en) * 1986-08-07 1987-07-21 Lockheed Corporation Vacuum bag sealing system
US4698115A (en) * 1984-09-28 1987-10-06 The Boeing Company Silicone rubber vacuum bag tool and method of fabricating same
US4842670A (en) * 1986-03-07 1989-06-27 Northrop Corporation Molded vacuum bag for debulking and autoclaving laminates of complex shapes
US5370598A (en) * 1993-04-29 1994-12-06 Grumman Aerospace Corporation Method of making reusable vacuum bag
US20040115299A1 (en) * 2002-12-11 2004-06-17 John Potter Seal-less reusable vacuum bag

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698115A (en) * 1984-09-28 1987-10-06 The Boeing Company Silicone rubber vacuum bag tool and method of fabricating same
US4842670A (en) * 1986-03-07 1989-06-27 Northrop Corporation Molded vacuum bag for debulking and autoclaving laminates of complex shapes
US4681651A (en) * 1986-08-07 1987-07-21 Lockheed Corporation Vacuum bag sealing system
US5370598A (en) * 1993-04-29 1994-12-06 Grumman Aerospace Corporation Method of making reusable vacuum bag
US20040115299A1 (en) * 2002-12-11 2004-06-17 John Potter Seal-less reusable vacuum bag

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009136845A1 (fr) * 2008-05-09 2009-11-12 Saab Ab Formage à chaud d'une tenture
GB2479463A (en) * 2010-04-08 2011-10-12 Gssc Inc Membrane seal in composite moulding
EP2821210A1 (fr) * 2013-07-02 2015-01-07 The Boeing Company Traitement sous vide de pièces composites à l'aide d'un ensemble formant un sac sous vide conformable
KR20150004267A (ko) * 2013-07-02 2015-01-12 더 보잉 컴파니 일치가능 진공 백 조립체를 사용하는 복합재 부품의 진공 백 공정
US9707705B2 (en) 2013-07-02 2017-07-18 The Boeing Company Vacuum bag processing of composite parts using a conformable vacuum bag assembly
KR102099585B1 (ko) 2013-07-02 2020-04-13 더 보잉 컴파니 일치가능 진공 백 조립체를 사용하는 복합재 부품의 진공 백 공정

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