US3876449A - Method for impregnating selected regions of a gas permeable blanket - Google Patents

Method for impregnating selected regions of a gas permeable blanket Download PDF

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Publication number
US3876449A
US3876449A US317572A US31757272A US3876449A US 3876449 A US3876449 A US 3876449A US 317572 A US317572 A US 317572A US 31757272 A US31757272 A US 31757272A US 3876449 A US3876449 A US 3876449A
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US
United States
Prior art keywords
blanket
impregnate
vacuum
enclosure
regions
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.)
Expired - Lifetime
Application number
US317572A
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English (en)
Inventor
Harvell Morton Smith
Larry Edward Howard
Iii Harry Todd Mitchell
Lester Fisher
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.)
Johns Manville Corp
Johns Manville
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Johns Manville
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Publication date
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Priority to US317572A priority Critical patent/US3876449A/en
Priority to JP48141996A priority patent/JPS5123546B2/ja
Priority to CA188,649A priority patent/CA1008316A/en
Application granted granted Critical
Publication of US3876449A publication Critical patent/US3876449A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor

Definitions

  • the degree of penetration of the impregnate into the blanket is a function of the degree of the vacuum created and the time over which the vacuum is applied. Where relatively deep penetration is desired in certain portions of a region, a partial vacuum or negative pressure zone can be created in the enclosure adjacent these portions.
  • the present invention relates to a gas permeable insulating blanket which has been impregnated in selected regions and the method and apparatus for producing such a blanket.
  • Such a blanket would have the advantage of greatly reducing the weight of the core while providing the fire retardant properties and ma chinability required for such a core.
  • the present invention provides a method for producing localized impregnation of a gas permeable insulating blanket comprising: (a) enclosing the blanket, except for surfaces of regions to be impregnated, in a gas impermeable enclosure, (b) applying an impregnate over the exposed surfaces of the regions to be impregnated, and (c) creating a partial vacuum within the enclosure to draw the impregnate into the regions being impregnated.
  • the apparatus utilized comprises a pair of platens having opposed major surfaces.
  • the platens can be moved between first and second positions. In the first position the major surfaces of the platens are adapted to clamp a blanket therebetween and in the second po sition the major surfaces are spaced apart a sufficient distance to permit the insertion and removal of blankets from the apparatus.
  • the major surfaces of the platens together with side closure plates carried on one of the platens define a cavity between the platens which is adapted to receive a gas permeable blanket.
  • a blanket is in the cavity one of the closure plates is positioned to expose a surface of the blanket so that impregnate can be placed on the exposed surface of the blanket.
  • means for creating a partial vacuum within the cavity is activated to draw the impregnate into the regions of the blanket to be impregnated.
  • the above method and apparatus are utilized to impregnate localized regions of the insulating blanket with a resin so that a hard wood-like machineable surface is provided on the edges of the blanket.
  • the remainder of the blanket remains soft, flexible and of low density.
  • FIG. 1 is a perspective view of the apparatus of the present invention
  • FIG. 2 is a side elevational view of the apparatus platens
  • FIG. 3 is an elevational view of the major surface of one of the platens taken substantially along lines 33 of FIG. 2;
  • FIG. 4 is a cross sectional view through the platens with an insulating blanket in place and taken substantially along lines 44 of FIG. 1.
  • the impregnating apparatus includes two platen assemblies 2'0 and 22. While the illustrated assembly is one preferred form of the apparatus for carrying out the method of the present invention, it will be apparent to those of ordinary skill in the art that certain modifications can be utilized in the apparatus which are equivalent to those disclosed and illustrated.
  • the platen assemblies 20 and 22 are each provided with a metal platen 24 and 26, respectively, which are supported on hollow shafts 28 and 30.
  • the hollow shafts 28 and 30 are each rotatably mounted on a carriage (not shown) and provided with a conventional indexing means (e.g., a ring gear on the shaft which meshs with an output gear of an electric motor affixed to the carriage) for rotating the platen assembly through intervals of
  • the carriages are each slidably mounted in tracks and provided with double acting hydraulic piston cylinder assemblies or other conventional means for moving the platens 24 and 26 toward or away from each other. While both platens must be capable of rotation to index successive sides of the platens into position for the impregnating process. Only one of the platens needs to be reciprocally mounted to bring the platens into position for the impregnating operation and to separate the platens for the insertion and removal of insulating blankets.
  • the platens 24 and 26 have major surfaces 32 and 34 respectively which engage and clamp the insulating blanket 36 therebetween when the platens are brought into their operative position.
  • the major surfaces 32 and 34 are provided with recesses 38 and 40 which communicate with vacuum pumps (not shown) through the hollow shafts 28 and 30 of the platen assemblies and vacuum ports 42 and 44.
  • the recesses 38 and 40 are shallow and constricted at their midportions.
  • the shallow recesses 38 and 40 are elongated with constricted center portions and flaring end portions which terminate adjacent ends of the platens.
  • the configuration of the recesses is illustrated in FIG. 3 which shows the constricted portion 46 and the flaring end portions 48 of the recess 38.
  • the recess shown in FIG. 3 is only constricted relative to the longer side edges, the recess can also be constricted in its midportion relative to the upper and lower edges.
  • the upper and lower edges as shown in FIG. 3 were as long as or longer than the side edges shown in that Figure, it would be necessary to constrict the midportion of the recess relative to these edges to equalize the effective suction along these edges.
  • the platen 24 is provided with a series of sliding closure plates 50, 52, 54 and 56 which are located about the major surface 32 the platen and cooperate with a complementary groove 58 extending about the periphery of the major surface 40 of platen 26.
  • the plates 50, 52, 54 and 56 are each provided with a pair of depending runners 60 which are received in complementary slots 62 located in side walls of the platen 24.
  • the runners 60 and the slots 62 have dove tail configurations so that the slots in the side wall both guide the closure plates and provide a means for retaining the closure plates in place.
  • the runners 60 extend from rear edges of the closure plates to about the middle of the plates.
  • the lengths and positions of the runners plus the lengths of the slots in the side walls are coordinated so that when the plates bottom on the slot 58 in the platen 26, the runners are flush with the major surface 32 of the platens or somewhat recessed within the ends of the slots 62. While as shown the plates are slid in and out manually, it is contemplated that conventional mechanisms can be utilized to automatically slide the closure plates back and forth.
  • FIGS. 2 and 3 show auxiliary vacuum ports 64 and 66 of the present invention which are utilized to induce impregnation of localized regions of the blanket to a depth greater than surrounding regions. These auxiliary ports are particularly adapted for use with a blanket where it is desired to provide a hardened area of greater depth for the location of a door knob and lock or similar means.
  • the auxiliary vacuum ports are located on the major surfaces 32 and 34 of the platens and are connected to an auxiliary vacuum pump.
  • the vacuum ports 64 and 66 are arranged inwardly of a region where the greater depth of impregnation is to occur, and reduce the pressure in the region intermediate the vacuum ports and the edge of the major surface.
  • An impregnate applying apparatus 68 is provided to apply impregnate along the upper edge of an insulating blanket retained between platens 24 and 26.
  • the applicator comprises a trough 70 which is divided by a plurality of plates 72 into sections with each section having its own impregnate supply line 74. Since the trough is divided into a plurality of sections (e.g., five sections) a particular section can supply impregnate to a specific region of an exposed edge. Thus, when it is desired to produce a localized region of greater impregnate penetration, impregnate can be poured on localized portion of the edge above that region.
  • a central section 76 is offset somewhat to facilitate the application of impregnate to an edge portion of an insulating blanket where a door knob and lock would be placed.
  • the central section 76 along with two intermediate sections 78 combine to supply the transverse edge of the blanket with impregnate. All five sections, including outer sections 80, are utilized to provide the longitudinal edge portions with impregnate.
  • Each of the supply lines 74 to the various sections of the trough is provided with a conventional valve 82 which can be suitably actuated by conventional controls to provide a flow of impregnate to the specific sections required for a particular application of an impregnate.
  • the impregnate assembly is mounted on a carriage (not shown) which can be moved in a vertical direction.
  • the trough can be located at the proper elevation for supplying impregnate to both the longitudinal and transverse edges of the blanket.
  • the trough can be raised to permit the indexing of the platens without the platens coming into contact with the trough.
  • a blanket of gas permeable insulating material 36 e.g., fiber glass insulating material is placed in platen 24 with closure plates 52, 54 and 56 extended.
  • the platens are then brought together so that the closure plates 52, 54 and 56 are received in the groove 58 of the platen 26 and the major surfaces of the platens grip the blanket 36 of insulating material therebetween.
  • the impregnate is then coated over the exposed edge of the blanket by allowing the impregnate to flow from the sections 76 and 78 of the trough all along the upper edge of the blanket.
  • the vacuum pump or pumps which communicate with recesses 38 and 40 through ports 42 and 44 are turned on and the impregnate is drawn into the insulating blanket by the vacuum created within the cavity.
  • the degree of penetration by the impregnate is governed by the degree of the vacuum created within the cavity and the length of time the vacuum is applied.
  • closure plate 56 is slid back and the closure plate 50 is slid into the groove 58 to thereby provide an enclosure wherein only the upper edge of the blanket is exposed by the retraction of the closure plate 56.
  • the sequence of impregnation. is thus repeated until each edge of the blanket has been impregnated. Once the impregnation of the blanket 36.
  • the impregnate When it is desired to impregnate one region of the blanket to a greater depth, the impregnate is applied from the central section 76 of the trough to the surface area of the blanket immediately above the auxiliary vacuum ports 64 and 66.
  • the vacuum pumps for the auxiliary vacuum system are then actuated for a suffi-' cient amount of time to draw the impregnate down to the desired depth.
  • the remainder of the edge is coated with the impregnate and the main vacuum system is actuated to draw the impregnate into the blanket the desired depth along the entire edge.
  • the above procedure can also be reversed with the auxiliary vacuum system being operated to draw the impregnate to a greater depth in the central region after the entire upper edge has been impregnated through the use of the main vacuum system.
  • a basic fiber glass insulating board of the required density (e.g., about 6 pounds/cubic foot) is produced in a conventional manner including a normal cure.
  • the board is then cut slightly oversize and is impregnated to a depth of typically up to about an inch and three quarters by the process outlined above with a resin material. All four edges of the board and the region for the door handle and lock are impregnated.
  • the impregnate is then cured and sanded or otherwise finished to the proper size.
  • the resin material contains both resin and a filler.
  • the resins can be phenolic, melamine or urea resins or modifications and mixtures thereof.
  • the fillers can in clude asbestos, powdered glass, clays and other equivalent fillers.
  • the material can also contain certain vinyl based monomers and/or cellulosic polymers and/or certain inorganic intermediate bonding agents.
  • the above processes produce an insulating blanket having strong high density edges to a desired depth. These edges are both machineable and have the required strength to hold screws to support the door on hinges and the like. The interior of the blanket remains as a low density soft flexible insulation blanket.
  • a method for producing localized impregnation of a gas permeable insulating blanket comprising:
  • the blanket is enclosed except for one edge of the blanket.
  • a the degree of penetration of the impregnate into the blanket is controlled by the degree of the vacuum created and the time the vacuum is applied.
  • a method for producing localized impregnation of a gas permeable insulating blanket having two major surfaces with a plurality of edges joining the major surfaces comprising:
  • the degree of penetration of the impregnate into the blanket is controlled by the degree of the vacuum created and the time the vacuum is applied.

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforced Plastic Materials (AREA)
  • Moulding By Coating Moulds (AREA)
  • Insulating Bodies (AREA)
US317572A 1972-12-22 1972-12-22 Method for impregnating selected regions of a gas permeable blanket Expired - Lifetime US3876449A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US317572A US3876449A (en) 1972-12-22 1972-12-22 Method for impregnating selected regions of a gas permeable blanket
JP48141996A JPS5123546B2 (enrdf_load_stackoverflow) 1972-12-22 1973-12-20
CA188,649A CA1008316A (en) 1972-12-22 1973-12-20 Method and apparatus for impregnating selected regions of a gas permeable blanket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US317572A US3876449A (en) 1972-12-22 1972-12-22 Method for impregnating selected regions of a gas permeable blanket

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US3876449A true US3876449A (en) 1975-04-08

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US317572A Expired - Lifetime US3876449A (en) 1972-12-22 1972-12-22 Method for impregnating selected regions of a gas permeable blanket

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US (1) US3876449A (enrdf_load_stackoverflow)
JP (1) JPS5123546B2 (enrdf_load_stackoverflow)
CA (1) CA1008316A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993517A (en) * 1975-10-31 1976-11-23 The United States Of America As Represented By The Secretary Of The Interior Thin cell electromembrane separator
US4144836A (en) * 1976-05-06 1979-03-20 Georg Fischer Ag Brugg Apparatus for the vacuum impregnation of boards or panels of porous material
US4200604A (en) * 1974-05-02 1980-04-29 Gte Sylvania Incorporated Method for forming a sealed outer ring for ceramic regenerator
US4873126A (en) * 1988-08-15 1989-10-10 Becton, Dickinson And Company System and process for spotting reagents on porous supports
US5045385A (en) * 1989-08-30 1991-09-03 Radixx World, Ltd. Fire retardant composition for building panels and door cores

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341645A (en) * 1940-05-16 1944-02-15 Celotex Corp Tiling
US2903389A (en) * 1956-08-03 1959-09-08 Fujita Toshitsune Method of molding reinforced plastics
US3301648A (en) * 1963-07-01 1967-01-31 Bausch & Lomb Method of confining and surfacing end portions of optical fiber bundles for maximum light transmission

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341645A (en) * 1940-05-16 1944-02-15 Celotex Corp Tiling
US2903389A (en) * 1956-08-03 1959-09-08 Fujita Toshitsune Method of molding reinforced plastics
US3301648A (en) * 1963-07-01 1967-01-31 Bausch & Lomb Method of confining and surfacing end portions of optical fiber bundles for maximum light transmission

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200604A (en) * 1974-05-02 1980-04-29 Gte Sylvania Incorporated Method for forming a sealed outer ring for ceramic regenerator
US3993517A (en) * 1975-10-31 1976-11-23 The United States Of America As Represented By The Secretary Of The Interior Thin cell electromembrane separator
US4144836A (en) * 1976-05-06 1979-03-20 Georg Fischer Ag Brugg Apparatus for the vacuum impregnation of boards or panels of porous material
US4873126A (en) * 1988-08-15 1989-10-10 Becton, Dickinson And Company System and process for spotting reagents on porous supports
AU608737B2 (en) * 1988-08-15 1991-04-11 Becton Dickinson & Company System and process for spotting reagents on porous supports
US5045385A (en) * 1989-08-30 1991-09-03 Radixx World, Ltd. Fire retardant composition for building panels and door cores

Also Published As

Publication number Publication date
CA1008316A (en) 1977-04-12
JPS5123546B2 (enrdf_load_stackoverflow) 1976-07-17
JPS4990766A (enrdf_load_stackoverflow) 1974-08-29

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