CA1071990A - Rolling lobe diaphragm manufacture - Google Patents
Rolling lobe diaphragm manufactureInfo
- Publication number
- CA1071990A CA1071990A CA255,348A CA255348A CA1071990A CA 1071990 A CA1071990 A CA 1071990A CA 255348 A CA255348 A CA 255348A CA 1071990 A CA1071990 A CA 1071990A
- Authority
- CA
- Canada
- Prior art keywords
- wire
- sock
- impregnated
- intermediate portion
- bead
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/005—Producing membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/755—Membranes, diaphragms
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reinforced Plastic Materials (AREA)
- Ropes Or Cables (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Diaphragms And Bellows (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In the manufacture of a rolling lobe diaphragm by forming a sock on a spool having opposed, relatively rotatable hyperboloid portions the diaphragm is provided with a radially inextensible bead reinforcement by winding a filamentary material, such as wire, around the sock on the spool. The wire may be sheathed in uncured rubber which will bond to the sock, or a filamentary material may be used which will harden after being wound round the sock.
In the manufacture of a rolling lobe diaphragm by forming a sock on a spool having opposed, relatively rotatable hyperboloid portions the diaphragm is provided with a radially inextensible bead reinforcement by winding a filamentary material, such as wire, around the sock on the spool. The wire may be sheathed in uncured rubber which will bond to the sock, or a filamentary material may be used which will harden after being wound round the sock.
Description
~ - \
~719~) The present invention rela~es to improvements in diaphragms and moxe paxticularly to an improved method for the production of a diaphra~m of the rolling lobe type and to a rolling lobe diaphragm made by the method.
In Canadian Patent No. 702,533 dated January 26, 1965, there is disclosed a method of manufacturing a diaphragm by winding filamentary material over the peripheral edges of two relatively axially movable and co-axially mounted end portions of a forming spool to form a tubular sock from the material and then relatively rotating said end portions while allowing them to approach one another to produce a neck in the sock. After treatment of the sock to retain its shape it is removed from the forming spool and one end of the sock is pushed through a ring which is to provide a bead reinforcement for the narrower diameter end oE the formed diaphragm. Thereafter one end o~ the sock ig folded over the other 50 that the bead ring is between the two layers of the sock material. The sock preferably comprises uncured rubber which, on curing, bonds the two layers of the sock together thereby retaining ~0 the bead ring at the narrower end of the formed diaphragm.
U. K. Patent Specification No. 1,034,105 discloses a preferred means of f~ng-one end o~ the diaphragm over the other utilisiny an inflatable bag.
U. K. Patent Speci~ication Nos. 1,059,330 and 1,059,329 relate respectively to a method and an apparatus whereby such a diaphragm can be built on a forming reel or spool which comprises two halves, aach of which has an end portion which is cylindrical in form and an inwardly extending concavely curved portion in the form of a hyperboloid portion.
The two halves are carried in co-axial relation on a rod ~. .' ,.
~719~) The present invention rela~es to improvements in diaphragms and moxe paxticularly to an improved method for the production of a diaphra~m of the rolling lobe type and to a rolling lobe diaphragm made by the method.
In Canadian Patent No. 702,533 dated January 26, 1965, there is disclosed a method of manufacturing a diaphragm by winding filamentary material over the peripheral edges of two relatively axially movable and co-axially mounted end portions of a forming spool to form a tubular sock from the material and then relatively rotating said end portions while allowing them to approach one another to produce a neck in the sock. After treatment of the sock to retain its shape it is removed from the forming spool and one end of the sock is pushed through a ring which is to provide a bead reinforcement for the narrower diameter end oE the formed diaphragm. Thereafter one end o~ the sock ig folded over the other 50 that the bead ring is between the two layers of the sock material. The sock preferably comprises uncured rubber which, on curing, bonds the two layers of the sock together thereby retaining ~0 the bead ring at the narrower end of the formed diaphragm.
U. K. Patent Specification No. 1,034,105 discloses a preferred means of f~ng-one end o~ the diaphragm over the other utilisiny an inflatable bag.
U. K. Patent Speci~ication Nos. 1,059,330 and 1,059,329 relate respectively to a method and an apparatus whereby such a diaphragm can be built on a forming reel or spool which comprises two halves, aach of which has an end portion which is cylindrical in form and an inwardly extending concavely curved portion in the form of a hyperboloid portion.
The two halves are carried in co-axial relation on a rod ~. .' ,.
2.
.
~7~9~
with the inner hyperboloid portions spaced apart while a tubular sock is built on the spool comprising sheets of flexible material made up from adhesively coated cords.
Thereafter the halves of the reel are relatively rotated on the rod and their hyperboloid portions are moved into contact to produce a sock with a narrower diameter central portion in which the cords or filaments no lonyer extend axially of the sock. A bead wire ring is applied externally over the centre of the sock and it is then ~ ed and cured, e.g. by the method ~scribed in U. K. Paten-t Speciication No.
1,034,105.
Canadian Patent No. 732,494 dated ~pril l9, 1966 relates to the improvement of utilising for the beacl rein-Eorcements a-t the narrower diameter ends of the diaphragm a wire coil which i9 extensible in the longitudinal direction but substantially incompressible in respect of its cross-sectional shape. This reinforcement will yield to allow the opening at the narrower diameter end of the ormed diaphragm to be enlarged.
U. K. Patent Specification No. 1,330,465 relates to the formation of the sock from sheet material and a textile rein~orcement sprayed with a rubber solution containing the compounds necessary to form an aldehyde condensation resin.
It is not always desirable to use the ex*ensible bead reinforcement of Canadian Patant 732,494. The method currently employad for producing the ma~ority of rolling lobe -diaphragms involves removing the sock from the reel on which it has been formed and twisted, passing one end of the sock through a pre-formed, substantially radially inextensible bead ring until the ring is located at the neck of the sock - ~
~7~9~[3 and then mounting one end of the sock on a former such as is described in U. K. Patent No. 1,034,105 so that the other end of the sock can be folded over the end on the former and the uncured rubber contained in ~he sock can be cured to produce the finished diaphragm.
These operations are carried out manually, which affects the cost of the finished product. Additionally, the manual operation of "wringing the neck" of the sock to pass one end through a small, pre-formed bead reinforcement ring can damage the sock, or example by displacing the filamentary material which is not yet held in position by curing the rubber.
Among the objects of the present invention are to reduce the manual labour involved in the production of a rolling lobe diaphragm and to eliminate the cause of possible damage reEerred to in the previous paragraph.
According to the present invention there is provided a method of manufacturing a rolling lobe diaphragm which comprises winding a cord of textile material alternately from a peripheral, circular, edge of one of two axially spaced end portions of a forming spool to a peripheral circular, edge of the other end portion to form a substantially cylindrical enclosure o parallel cord length~ between said end peripheries, twisting said end portions re:Latively to each other about their common axis while moving said circular peripheries toward each other during said twisting to draw said cord lengths between said circular peripheries in side-by-side position to form an intermediate portion of reduced diamter spaced from said circular peripheries, embedding saicl cords in a flexible sheet of elastomer to form an ~impervious enclosure and to maintain said cord structure assembly on ~. ' .
99~
removal of said structure from said forming spool, applying a plurality of windings of a filamentary mat~rial on said intermediate portion of reduced diameter to form a radially inextensible annular bead thereon, and folding the resulting structure on one side of said annular bead about ~aid annular bead onto the structure on the opposite side of said annular bead.
The said bead reinforcement may be formed by winding onto the sock individual strands respectively impregnated with the components of a chemically co-reactive system capable of curing or haxdening in each others presence and curing or hardening or allowing to cure or harden the thus formed bead reinEorcement. Said strands may be twisted to orm a cord which is wound around the sock. The strands may be impregnated one with an unsaturated po}yester resin dissolved in styrene containing a catalyst e~g. cobalt and preferably a tertiary amine in addition and another with an unsaturated polyester resin dissolved in styrene to which has been added a solution of a peroxide such as methyl ethyl ketone peroxide in dimethyl phthalate. Another example o~ this type of system is to re-place the polyester resin by an epoxy resin e.g. in a two component system; one component being an epoxy resin such as that available under the ~rade mark Epikote 815 from Shell Canada Limited and the other component being a catalyst e.g~
boron trifluoride etherate in solution eOg. in tetrahydro furfuryl phthalate. If the filamentary material is of steel -~
wire the preferred co-reactive system is based on an epoxy resin.
Subsequent to winding the bead reinforcement is preferably subjected to a jet of warm air to cure the same.
~CI 7~9~ ~
Alternatively the filamentary material may be impregnated with a solution or dispersion of a polymerisable liquid and a phoko initiator and the bead reinforcement may be exposed to ultra-violet light to cure t.he same. In this method said filamentary material may be i~lpregnated with an unsaturated polyester resin dissolved in styrene to which is added benzoin-n-butyl ether and the wound bead reinforce-ment may be exposed to a medium pressure mercury vapour lamp.
Another example of this method is to impregnate the fila-mentary material with an epoxy resin composition containing a photo initiator and expose the wound bead reinforcement ~o ul~ra-violet ligh~
The filamentary mat~rial may be a strand of fibre-glass, cotton, polyester, rayon, nylon, aromatic polyamide such as that available under the trade mark, Kevlar, carbon filaments, or metal wire such as fine steel wire.
Preferably the resinous composition is hardened or cured or allowed to harden or cure prior to foldin~ the sock. ...
The filamentary material may alternatively be wire, pref~rably a braided wire, which is preferably sheathed in a material which can be adhered to itself and~or to the sock to secure the windings. The sock on the spool~may have an outer surface of uncured rubber, the wire may be sheathed in -.
uncured rubber and the formed diaphragm may be subjected to treatment to cure the rubber thereby bonding the wire sheath to the sock. The windings of wire may be secured by a number of windings of tape applied over the wire, and where the sock comprises uncured rubber and t~e wire is sheathed in uncured rubber the tape is advantageously of uncured rubber which will subsequently bond to ~he sheath and the sock in the curing -treatment.
~C~7~99(~
A preferred embodiment of the inven~ion will now be described wi-th reference to the accompanying drawings, in which:-Figurs l illustrates a sock on a forming reel to which a bead reinforcement is being applied by the method of the present invention, and Figure 2 illustrates a subsequent step in the diaphragm forming method in which o~ half of the sock is ~olded over the other.
The sock lO illustrated in Figure l has been made by the method described in Canadian Patent 702,533 or U. K.
Patent Specification Nos. l,034,105, 1,059,330 or 1,330,465 by building up rubberised filamentary matarial on a reel com- ;
prising similar half portions 11 and 12 which have mutually opposed hyperboloid portions 13 and 14.
After building the sock one of the halves ll or 12 has been rotated relative to the other to bring the sock 10 to the shape shown with a central portion of reduced diameter.
In accordance with the present invention, a bead reinforcement is now built on the sock lO by applying to its central, reduced diameter portion several windings 15 of a braided wire 16 which ha~ a sheath 17 of uncured rubber.
Ater applying the desired number o~ windings oE the wire 16 to the sock 10 the appropriate length o~ wire is cut off and the tacky uncured rubber of the sheath 17 will tend to ~
hold ~ windings in place by the windings adhering together -; and to ~ sock 10 especially if the sock lO has an external surface of uncured rubber. ~ number of windings of uncured ; rubber tape 18 can be applied over the windings of wire 16 to assist in holding them in place.
' " ' ~ ' '. ' ~ ~ ' . ' ' ' ' '. ' ' ;;' ' ' ' ' ' '. '.' ' ' ' "
7~99~
As described in U-. K. Patent Specification No.
1,034,105 one end of the sock 10 is now placed over a substantially bell~shaped former 19 and the other end of the sock is folded over usiny an inflatable bag from the position shown in dotted lines in Figure 2. The windings 15 of wixe are thus enclosed between the two layers of the sock at the narrower diameter end of the diaphragm thus formed. To finish the diaphragm, the folded sock is subjected to trea~-ment to cure the rubber which bonds the two layers of t:he sock together as well as bonding the rubber of the sheath 17 to the rubber of the sock 10 and the additional rubher of the tape 18.
Alternatively the bead reinforcement for the narrower diameter end of tile diaphragm may be built on the ~ock using, in place of ~he wire 16, flexible strands of glass, co'ton, polyester, rayon, aromatic polyamide such as that available under the trade mark Kevlar, carbon filaments or metal wire such as fine steel wire impregnated with ;;
materials which can be cured to provide a substantially rigid bead reinforcement on the sock before folding.
To provide a head reinforcement which can be easily and reliably maintained in position on the sock the bea~ rein-forcement for the narrower-diameter end o~ the diaphragm may be formed by winding onto the sock 10, in place o~ the wire 16, several turns of a cord (not shown) made by twisting together individual strands respectively impregnated with components of a chemically co-reactive system, the strands being flexible when wound onto the sock and subsequently being cured or allowed to cure before the folding operation.
In one example of a method o~carrying Ollt the invention individual fibre glass strands were impregnated respectively , . : . .
~197~9~
one wi-th an unsaturated polyester resin dissolved in styrene containing cobalt and a tertiary amine commercially available under the trade mark Strandglass Resin K and the other with an unsaturated polyester resin dissolved in s~yrene commercially available under the trade mark Beetle Resîn 862 to which had been added 5~ by weight of a 50~ by weight solution of methyl ethyl ketone peroxide in dimethyl phthalate. Theitwo impregnated strands were twisted together to form a flexible cord which was wound round a sock to form a bead reinforcement in place of the sheathed wire 16 of the example first described.
A narrow jet of warm air was applied to the zone of the sock onto which the cord was wound and under these conclitions yelation o~ tha resin took place ~lmost a~ quickly as the bead was wound. The same gentle heating was applied for a further 60 seconds to complete the cure of the resin, which resulted in a substantially rigid annulus surrounding and in contact with the sock, which was then folded and cured as described in the first example.
In yet another example the sheathed wire 16 was replaced by a strand of fibre-glass impregnated with a poly-merisable liquid containing a photo initiator. The bead reinforcement was formed by windiny onto the sock a strand of fibre-glass filaments impregnated with an unsaturated ~ .
polyester resin dissolved in styrene (commercially available under the trade mark Beetle Resin 862) to which had been added 2% by weight of benzoin-n-butyl ether. Exposure of the windings of the strand on the sock to ultra-violet light from a medium pressure mercury vapour lamp (commercially available under the trade mark Hanovia, type 220 UVS) resulted in cure o~ the resin on the side of the soclc '' 9. .~: ~
.. . . ................................................. .
: .. . ~ , :
7199~
exposed to the lamp in 1~0 seconds, whereupon the other or "shadowed" side of the bead was similarly cured. The former is preferably rotated about its axis during cure of the bead windings, and one or more additional mercury vapour lamps ar~ prefexably employed distributed around the sock.
Preferably the uncured rubber surface of the sock is masked from the ultra-violet light excep~ in a narrow zone where the bead reinforcement is located.
By methods above described, it is not necessary after removing the sock 10 on the halves 11 and 12 of the reel to "wring the neck" of the neck to get one end of it throuyh a bead reinforcement riny.
Although only the formation of the bead rein-forcement of the narrower diamter end of a diaphragm has been particular}y described, it will be apprecia-ked that the filament winding techniques of the invention are equally applicable to the formation of a substantially radially inextensible bead reinforcement for the larger-diameter Pnd of a rolling lobe diaphragm.
:.:
10.
:
,:, - ~
- . .
.
~7~9~
with the inner hyperboloid portions spaced apart while a tubular sock is built on the spool comprising sheets of flexible material made up from adhesively coated cords.
Thereafter the halves of the reel are relatively rotated on the rod and their hyperboloid portions are moved into contact to produce a sock with a narrower diameter central portion in which the cords or filaments no lonyer extend axially of the sock. A bead wire ring is applied externally over the centre of the sock and it is then ~ ed and cured, e.g. by the method ~scribed in U. K. Paten-t Speciication No.
1,034,105.
Canadian Patent No. 732,494 dated ~pril l9, 1966 relates to the improvement of utilising for the beacl rein-Eorcements a-t the narrower diameter ends of the diaphragm a wire coil which i9 extensible in the longitudinal direction but substantially incompressible in respect of its cross-sectional shape. This reinforcement will yield to allow the opening at the narrower diameter end of the ormed diaphragm to be enlarged.
U. K. Patent Specification No. 1,330,465 relates to the formation of the sock from sheet material and a textile rein~orcement sprayed with a rubber solution containing the compounds necessary to form an aldehyde condensation resin.
It is not always desirable to use the ex*ensible bead reinforcement of Canadian Patant 732,494. The method currently employad for producing the ma~ority of rolling lobe -diaphragms involves removing the sock from the reel on which it has been formed and twisted, passing one end of the sock through a pre-formed, substantially radially inextensible bead ring until the ring is located at the neck of the sock - ~
~7~9~[3 and then mounting one end of the sock on a former such as is described in U. K. Patent No. 1,034,105 so that the other end of the sock can be folded over the end on the former and the uncured rubber contained in ~he sock can be cured to produce the finished diaphragm.
These operations are carried out manually, which affects the cost of the finished product. Additionally, the manual operation of "wringing the neck" of the sock to pass one end through a small, pre-formed bead reinforcement ring can damage the sock, or example by displacing the filamentary material which is not yet held in position by curing the rubber.
Among the objects of the present invention are to reduce the manual labour involved in the production of a rolling lobe diaphragm and to eliminate the cause of possible damage reEerred to in the previous paragraph.
According to the present invention there is provided a method of manufacturing a rolling lobe diaphragm which comprises winding a cord of textile material alternately from a peripheral, circular, edge of one of two axially spaced end portions of a forming spool to a peripheral circular, edge of the other end portion to form a substantially cylindrical enclosure o parallel cord length~ between said end peripheries, twisting said end portions re:Latively to each other about their common axis while moving said circular peripheries toward each other during said twisting to draw said cord lengths between said circular peripheries in side-by-side position to form an intermediate portion of reduced diamter spaced from said circular peripheries, embedding saicl cords in a flexible sheet of elastomer to form an ~impervious enclosure and to maintain said cord structure assembly on ~. ' .
99~
removal of said structure from said forming spool, applying a plurality of windings of a filamentary mat~rial on said intermediate portion of reduced diameter to form a radially inextensible annular bead thereon, and folding the resulting structure on one side of said annular bead about ~aid annular bead onto the structure on the opposite side of said annular bead.
The said bead reinforcement may be formed by winding onto the sock individual strands respectively impregnated with the components of a chemically co-reactive system capable of curing or haxdening in each others presence and curing or hardening or allowing to cure or harden the thus formed bead reinEorcement. Said strands may be twisted to orm a cord which is wound around the sock. The strands may be impregnated one with an unsaturated po}yester resin dissolved in styrene containing a catalyst e~g. cobalt and preferably a tertiary amine in addition and another with an unsaturated polyester resin dissolved in styrene to which has been added a solution of a peroxide such as methyl ethyl ketone peroxide in dimethyl phthalate. Another example o~ this type of system is to re-place the polyester resin by an epoxy resin e.g. in a two component system; one component being an epoxy resin such as that available under the ~rade mark Epikote 815 from Shell Canada Limited and the other component being a catalyst e.g~
boron trifluoride etherate in solution eOg. in tetrahydro furfuryl phthalate. If the filamentary material is of steel -~
wire the preferred co-reactive system is based on an epoxy resin.
Subsequent to winding the bead reinforcement is preferably subjected to a jet of warm air to cure the same.
~CI 7~9~ ~
Alternatively the filamentary material may be impregnated with a solution or dispersion of a polymerisable liquid and a phoko initiator and the bead reinforcement may be exposed to ultra-violet light to cure t.he same. In this method said filamentary material may be i~lpregnated with an unsaturated polyester resin dissolved in styrene to which is added benzoin-n-butyl ether and the wound bead reinforce-ment may be exposed to a medium pressure mercury vapour lamp.
Another example of this method is to impregnate the fila-mentary material with an epoxy resin composition containing a photo initiator and expose the wound bead reinforcement ~o ul~ra-violet ligh~
The filamentary mat~rial may be a strand of fibre-glass, cotton, polyester, rayon, nylon, aromatic polyamide such as that available under the trade mark, Kevlar, carbon filaments, or metal wire such as fine steel wire.
Preferably the resinous composition is hardened or cured or allowed to harden or cure prior to foldin~ the sock. ...
The filamentary material may alternatively be wire, pref~rably a braided wire, which is preferably sheathed in a material which can be adhered to itself and~or to the sock to secure the windings. The sock on the spool~may have an outer surface of uncured rubber, the wire may be sheathed in -.
uncured rubber and the formed diaphragm may be subjected to treatment to cure the rubber thereby bonding the wire sheath to the sock. The windings of wire may be secured by a number of windings of tape applied over the wire, and where the sock comprises uncured rubber and t~e wire is sheathed in uncured rubber the tape is advantageously of uncured rubber which will subsequently bond to ~he sheath and the sock in the curing -treatment.
~C~7~99(~
A preferred embodiment of the inven~ion will now be described wi-th reference to the accompanying drawings, in which:-Figurs l illustrates a sock on a forming reel to which a bead reinforcement is being applied by the method of the present invention, and Figure 2 illustrates a subsequent step in the diaphragm forming method in which o~ half of the sock is ~olded over the other.
The sock lO illustrated in Figure l has been made by the method described in Canadian Patent 702,533 or U. K.
Patent Specification Nos. l,034,105, 1,059,330 or 1,330,465 by building up rubberised filamentary matarial on a reel com- ;
prising similar half portions 11 and 12 which have mutually opposed hyperboloid portions 13 and 14.
After building the sock one of the halves ll or 12 has been rotated relative to the other to bring the sock 10 to the shape shown with a central portion of reduced diameter.
In accordance with the present invention, a bead reinforcement is now built on the sock lO by applying to its central, reduced diameter portion several windings 15 of a braided wire 16 which ha~ a sheath 17 of uncured rubber.
Ater applying the desired number o~ windings oE the wire 16 to the sock 10 the appropriate length o~ wire is cut off and the tacky uncured rubber of the sheath 17 will tend to ~
hold ~ windings in place by the windings adhering together -; and to ~ sock 10 especially if the sock lO has an external surface of uncured rubber. ~ number of windings of uncured ; rubber tape 18 can be applied over the windings of wire 16 to assist in holding them in place.
' " ' ~ ' '. ' ~ ~ ' . ' ' ' ' '. ' ' ;;' ' ' ' ' ' '. '.' ' ' ' "
7~99~
As described in U-. K. Patent Specification No.
1,034,105 one end of the sock 10 is now placed over a substantially bell~shaped former 19 and the other end of the sock is folded over usiny an inflatable bag from the position shown in dotted lines in Figure 2. The windings 15 of wixe are thus enclosed between the two layers of the sock at the narrower diameter end of the diaphragm thus formed. To finish the diaphragm, the folded sock is subjected to trea~-ment to cure the rubber which bonds the two layers of t:he sock together as well as bonding the rubber of the sheath 17 to the rubber of the sock 10 and the additional rubher of the tape 18.
Alternatively the bead reinforcement for the narrower diameter end of tile diaphragm may be built on the ~ock using, in place of ~he wire 16, flexible strands of glass, co'ton, polyester, rayon, aromatic polyamide such as that available under the trade mark Kevlar, carbon filaments or metal wire such as fine steel wire impregnated with ;;
materials which can be cured to provide a substantially rigid bead reinforcement on the sock before folding.
To provide a head reinforcement which can be easily and reliably maintained in position on the sock the bea~ rein-forcement for the narrower-diameter end o~ the diaphragm may be formed by winding onto the sock 10, in place o~ the wire 16, several turns of a cord (not shown) made by twisting together individual strands respectively impregnated with components of a chemically co-reactive system, the strands being flexible when wound onto the sock and subsequently being cured or allowed to cure before the folding operation.
In one example of a method o~carrying Ollt the invention individual fibre glass strands were impregnated respectively , . : . .
~197~9~
one wi-th an unsaturated polyester resin dissolved in styrene containing cobalt and a tertiary amine commercially available under the trade mark Strandglass Resin K and the other with an unsaturated polyester resin dissolved in s~yrene commercially available under the trade mark Beetle Resîn 862 to which had been added 5~ by weight of a 50~ by weight solution of methyl ethyl ketone peroxide in dimethyl phthalate. Theitwo impregnated strands were twisted together to form a flexible cord which was wound round a sock to form a bead reinforcement in place of the sheathed wire 16 of the example first described.
A narrow jet of warm air was applied to the zone of the sock onto which the cord was wound and under these conclitions yelation o~ tha resin took place ~lmost a~ quickly as the bead was wound. The same gentle heating was applied for a further 60 seconds to complete the cure of the resin, which resulted in a substantially rigid annulus surrounding and in contact with the sock, which was then folded and cured as described in the first example.
In yet another example the sheathed wire 16 was replaced by a strand of fibre-glass impregnated with a poly-merisable liquid containing a photo initiator. The bead reinforcement was formed by windiny onto the sock a strand of fibre-glass filaments impregnated with an unsaturated ~ .
polyester resin dissolved in styrene (commercially available under the trade mark Beetle Resin 862) to which had been added 2% by weight of benzoin-n-butyl ether. Exposure of the windings of the strand on the sock to ultra-violet light from a medium pressure mercury vapour lamp (commercially available under the trade mark Hanovia, type 220 UVS) resulted in cure o~ the resin on the side of the soclc '' 9. .~: ~
.. . . ................................................. .
: .. . ~ , :
7199~
exposed to the lamp in 1~0 seconds, whereupon the other or "shadowed" side of the bead was similarly cured. The former is preferably rotated about its axis during cure of the bead windings, and one or more additional mercury vapour lamps ar~ prefexably employed distributed around the sock.
Preferably the uncured rubber surface of the sock is masked from the ultra-violet light excep~ in a narrow zone where the bead reinforcement is located.
By methods above described, it is not necessary after removing the sock 10 on the halves 11 and 12 of the reel to "wring the neck" of the neck to get one end of it throuyh a bead reinforcement riny.
Although only the formation of the bead rein-forcement of the narrower diamter end of a diaphragm has been particular}y described, it will be apprecia-ked that the filament winding techniques of the invention are equally applicable to the formation of a substantially radially inextensible bead reinforcement for the larger-diameter Pnd of a rolling lobe diaphragm.
:.:
10.
:
,:, - ~
- . .
Claims (22)
1. A method of manufacturing a rolling lobe diaphragm which comprises winding a cord of textile material alternately from a peripheral, circular, edge of one of two axially spaced end portions of a forming spool to a peripheral circular, edge of the other end portion to form a substantially cylindrical enclosure of parallel cord lengths between said end peripheries, twisting said end portions relatively to each other about their common axis while moving said circular peripheries toward each other during said twisting to draw said cord lengths between said circular peripheries in side-by-side position to form an intermediate portion of reduced diameter spaced from said circular peripheries, embedding said cords in a flexible sheet of elastomer to form an impervious enclosure and to maintain said cord structure assembly on removal of said structure from said forming spool and applying a plurality of windings of a filamentary material on said intermediate portion of reduced diameter to form a radially inextensible annular bead thereon while the cord structure assembly is on the forming spool, removing the cord structure assembly from the forming spool and folding the resulting structure on one side of said annular bead about said annular bead onto the structure on the opposite side of said annular bead.
2. A method as claimed in Claim 1 wherein the filamentary material is impregnated with a hardenable or curable resinous composition such that said material is flexible during the winding operation but said composition hardened or cured or allowed to harden or cure subsequent to the winding operation.
3. A method as claimed in Claim 2 wherein the said bead reinforcement is formed by winding onto said intermediate portion individual strands respectively impregnated with the components of a chemically co-reactive system capable of curing or hardening in each others presence and curing or hardening or allowing to cure or harden the thus formed bead reinforcement.
4. A method as claimed in Claim 3 wherein said strands are twisted to form a cord which is wound around said intermediate portion.
5. A method as claimed in Claim 3 wherein said strands are impregnated one with an unsaturated polyester resin dissolved in styrene containing a metal catalyst and another with an unsaturated polyester resin dissolved in styrene to which has been added a solution of peroxide.
6. A method as claimed in Claim 5 wherein the metal catalyst is cobalt.
7. A method as claimed in Claim 5 or 6 wherein the styrene containing an unsaturated polyester resin and a metal catalyst also includes a tertiary amine.
8. A method as claimed in Claim 5 or 6 wherein the peroxide is methyl ethyl ketone peroxide.
9. A method as claimed in Claim 5 or 6 wherein the peroxide is in solution in dimethyl phthalate.
10. A method as claimed in Claim 3 wherein said strands are impregnated one with an epoxy resin and another with a solution of a catalyst.
11.A method as claimed in Claim 10 wherein the catalyst is boron trifluoride.
12. A method as claimed in Claims 5, 6 or 10 wherein subsequent to winding the bead reinforcement, the bead reinforcement is subjected to a jet of warm air to cure the same.
13. A method as claimed in Claim 2 wherein the filamentary material is impregnated with a polymerisable liquid containing a photo initiator and wherein the bead reinforcement is exposed to ultra-violet light to cure the same.
14. A method as claimed in Claim 13 wherein said filamentary material is impregnated with an unsaturated polyester resin dissolved in styrene to which is added benzoin-n-butyl ether and wherein the wound bead reinforcement is exposed to ultra-violet light.
15. A method as claimed in Claim 13 wherein said filamentary material is impregnated with an epoxy resin composition containing a photo initiator and wherein the wound bead reinforcement is exposed, prior to folding said inter-mediate portion to ultra-violet light.
16. A method as claimed in Claim 1 wherein the filamentary material is a strand of fibre-glass, cotton, polyester, rayon, nylon, aromatic polyamide, carbon or metal wire.
17. A method as claimed in Claim 16 wherein the metal wire is fine steel wire.
18. A method as claimed in Claim 1 wherein the resinous composition is hardened or cured or allowed to harden or cure prior to folding said intermediate portion.
19. A method as claimed in Claim 1 wherein the filamentary material used is wire sheathed in a material which can be adhered to itself and/or to said intermediate portion to secure the windings.
20. A method as claimed in Claim 19, wherein the wire used is braided wire.
21. A method as claimed in Claim 19 wherein said intermediate portion on the spool is provided with an outer surface of uncured rubber, the wire used is sheathed in uncured rubber and wherein the formed diaphragm is subjected to treatment to cure the rubber, thereby bonding the wire sheath to said intermediate portion.
22. A method as claimed in Claim 21 wherein uncured rubber tape is wound over the windings of rubber-sheathed wire.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2781075A GB1552229A (en) | 1975-07-02 | 1975-07-02 | Diaphragms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1071990A true CA1071990A (en) | 1980-02-19 |
Family
ID=10265675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA255,348A Expired CA1071990A (en) | 1975-07-02 | 1976-06-21 | Rolling lobe diaphragm manufacture |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS526861A (en) |
| AU (1) | AU501534B2 (en) |
| CA (1) | CA1071990A (en) |
| DE (1) | DE2629899A1 (en) |
| FR (1) | FR2316065A1 (en) |
| GB (1) | GB1552229A (en) |
| IT (1) | IT1063846B (en) |
| SE (1) | SE422905B (en) |
-
1975
- 1975-07-02 GB GB2781075A patent/GB1552229A/en not_active Expired
-
1976
- 1976-06-21 CA CA255,348A patent/CA1071990A/en not_active Expired
- 1976-06-24 AU AU15230/76A patent/AU501534B2/en not_active Expired
- 1976-06-28 SE SE7607364A patent/SE422905B/en not_active IP Right Cessation
- 1976-06-28 IT IT2481976A patent/IT1063846B/en active
- 1976-07-01 FR FR7620067A patent/FR2316065A1/en active Granted
- 1976-07-02 DE DE19762629899 patent/DE2629899A1/en not_active Withdrawn
- 1976-07-02 JP JP7884076A patent/JPS526861A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE7607364L (en) | 1977-01-03 |
| AU501534B2 (en) | 1979-06-21 |
| JPS526861A (en) | 1977-01-19 |
| FR2316065A1 (en) | 1977-01-28 |
| SE422905B (en) | 1982-04-05 |
| GB1552229A (en) | 1979-09-12 |
| DE2629899A1 (en) | 1977-01-20 |
| FR2316065B1 (en) | 1978-06-30 |
| IT1063846B (en) | 1985-02-18 |
| AU1523076A (en) | 1978-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |