CA1283063C - Reinforced molded plastic tank for compressed air and method of making same - Google Patents
Reinforced molded plastic tank for compressed air and method of making sameInfo
- Publication number
- CA1283063C CA1283063C CA000519672A CA519672A CA1283063C CA 1283063 C CA1283063 C CA 1283063C CA 000519672 A CA000519672 A CA 000519672A CA 519672 A CA519672 A CA 519672A CA 1283063 C CA1283063 C CA 1283063C
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- Prior art keywords
- envelope
- container
- plastic
- neck
- fabric
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Abstract
REINFORCED MOLDED PLASTIC TANK FOR COMPRESSED AIR
AND METHOD OF MAKING SAME
Abstract of the Disclosure A reinforced plastic presure vessel of sandwich-type construction and method of making same. A plastic hollow container is molded with at least one neck. A fabric envelope is fashioned to fit the container snugly and is slid over the container. The envelope is then either drawn closed by means of drawstrings or is covered by a second fabric envelope. The envelope-enclosed container is then coated with an outer layer of protective and stabilizing plastic.
AND METHOD OF MAKING SAME
Abstract of the Disclosure A reinforced plastic presure vessel of sandwich-type construction and method of making same. A plastic hollow container is molded with at least one neck. A fabric envelope is fashioned to fit the container snugly and is slid over the container. The envelope is then either drawn closed by means of drawstrings or is covered by a second fabric envelope. The envelope-enclosed container is then coated with an outer layer of protective and stabilizing plastic.
Description
)63 Description REINFORCED MOLDED PLASTIC TANK FOR COMPRESSED ~IR
AND METHOD O~ MAKlNG SAME
Technical Field This invention rela-tes, in general, to the manufacture of fiberglass-reinrorced plastic pressure vessels ~or s-toring compressed gases. The inven-tion is also directed to methods of making compressed air tanks for use in truck braking systems.
Back~round A_ Vessels or air tanks which are capable oE with-standing internal pressure are necessary in the braking andother systems on trucks. Such vessels when constructed of steel have several disadvantages. First, they are subject to corrosion from moisture and other contaminants found in compressed air systems. E~forts to coat the inside of these tanks with corrosion~resistant substances have not been totally successful. Second, they are heavy, which is a disadvantage in truck applications where the contribution of the weight of the vessel to chassis weight must displace payload.
A corrosion-resistant thermoplastic material would seem to overcome these disadvantages. Vessels constructed from thermoplastic materials have a larger strength-to-weight ratio than steel vessels. Ho~ever, current thermoplastic materials do not possess su~ficient strength to withstand -the opera~ing pressures o~ truck air systems unless they are reinforced with another material.
Typically, rein~orcement of plastic pressure vessels has been accomplished by winding filaments of a very high strenyth and sti~fness around the tank. This process is time-consuming and requires special winding equipment to accomplish a uniform application o~ a reinforcing filament .. .
, .
: . , 3~)~3 layer. Typical of these systems is the apparatus shown in Laibson, U.S. Patent No. 3,508,677. The process is expen-sive and has been limited to low production volumes and specialized tanks. It is prohibitively expensi~e for the manufacturer of truck air tanks and the like. Accordingly, it would be desirable in the ar-t to achieve a method o~
producing a reinforced plastic pressure vessel without -the need for winding filamen-tary material around the vessel.
Disclosure of Invention . . .
It is a primary objective oE the lnvention to provide a method for economically producing a reinEorced plastic vessel for compressed air or other pressurized fluids.
lS A further objective is to provide a method for producing a reinforced pressure vessel without the need for winding reinforcing material around the vessel.
A further objective i5 to produce a reinforced plastic vessel for compressed air for use in the bra]cing systems of trucks.
The present invention discloses a method for producing a reinforced molded plastic vessel by first fashioning a cylindrically shaped, hollow plas-tic container having a neck, with a passage extending through the neck to allow move~ent of fluid through the neck into and out of the container. The container is then enclosed by a cylin-drically shaped fabric envelope. The envelope has an open end which is dimensioned to slide over the container such that the open end of the envelope is fitted tightly around the neck end of the container and the envelope thereby encloses the container snugly. Finally, a layer oE
protective and stablizing plastic is applied to the ; envelope-enclosed container.
In a preferred embodiment of the invention~ the fabric envelope has, at its open end, drawstxings which allow the open end of the envelope to be closed snugly 3~3~3 around the neck of the con-tainer. The plastic container may have threaded me-tal inserts molded into its neck.
In a second preferred embodiment of the inven-tion, a second outer envelope covers the envelope-enclosed container before the outer plastic layer is applied. This second outer envelope is also cylindrical and has an opened and a closed end; however, lhe closed end of the outer envelope has an aper-ture which is dimensioned to allow the neck of the container to pass therethrough. After the outer envelope is slid onto the envelope-enclosed ; container, a protective ancl stablizing plastic is applied to -the doubly envelope-enclosed container. The plastic container may have threaded metal inserts molded into its neck.
In a third preferred embodiment of the invention, the hollo~ plastic container is fashioned to have two necks, located at opposite ends of the cylindrically shaped container. Each neck may have threaded metal inserts molded into it. Two cylindrically shaped envelopes are fashioned, each having an open end and a closed end, the closed end having an aperture dimensioned to allow one neck of the container to pass therethrough. One envelope is slid over the double-necked container such that the envelope covers the container and one neck of the container ~:25 extends through the aperture in the closed end of the envelope. Then, the second envelope is slid over the envelope-enclosed container such that the second envelope covers the envelope-enclosecl container and the second neck :of the container extends through the aperture in the closed 30 end of the second envelope. After the second envelope is properly situated, a protective and stabilizing plastic is applied to the doubly envelope-enclosed container.
Brie~ Descri~tion of the Drawlnqs Figure 1 is a side elevational view oE a thermo-plastic vessel used in this invention before reinforcement.
-' '' ' ~ ' ' ' ' . ~ ~X~33()63 Figure 2 is a top view of the vessel before reinforcement.
Figure 3 is a side view of a fabric envelope being drawn over the plastic vessel in the first pre~erred embodiment.
Figure 4 is a side view of the two fabric e~velopes being drawn over the plastic vessel in opposite directions in the second preferred embodiment.
Figure 5 is a side view of the finished vessel having two necks.
Figure 6 is an enlarged ~ectional view of a wall increment made in accordance with the present invention.
Best Mode for Carrying Out the Invention This invention discloses a method for construct-ing a reinforced plastic pressure vessel in a sandwich-type construction. The reinforced vessel's construction con-sists of an inner plastic layer, a reinforcing layer and an outer stablizing plastic layer.
A hollow thermoplastic container 9 of the desired shape and volume is molded by one of several common processes, such as blow molding or rotational molding. As Figure 1 demonstrates, the container has a neck 10 molded out of the plastic which serves as an opening through which f]uid can flow into and out of the container. As shown in Figure 2, the container is cylindrical in shape.
Next, a reinforcing fabric envelope is then woven or knitted separately from a filament-type reinforcing material such as glass, graphite or boron fibers.
Alternatively, the envelope may be constructed from metal wires or mesh, or high modulus organic materials, such as aramidt or any other high strength fiber materials. The envelope is fashioned to such dimensions as to fit snugly over the container.
The envelope 11 is then pulled over the molded container so that the open end of the envelope is located at the neck end of the container. This is shown in Figure ~ ;, 3~)~i3 3. The open end of the envelope can be drawn tight by means of draw strings 12 so that the open end of the envelope fits snugly around the neck of the container.
Alternatively, after the first envelope is pulled over the container, a second envelope 13 is also pulled over the container -to cover the first envelope. This is shown in Eigure 4. The second envelope is pulled on from the opposite end and has an aperture 14 knitted or woven into its closed end so that the neck of the container ma~
extend through the closed end of the second envelope.
In another alternative, the plastic container is molded with two necks, one at each end of the cylindrically shaped container as shown in Figure 5. Two cylindrically shaped envelopes are then fashioned from fiberglass, i.e., by knitting or weaving techniques. Each envelope has an open end and a closed end, the closed end having an aperture dimensioned to allow a neck of the container to pass therethrough. The first envelope is slid over the double-necked container such that the envelope covers the container and one neck of the container extends through the aperture in the closed end o~ the envelope. The second envelope is then slid over the envelope-enclosed container such that the second envelope covers the envelope-enclosed container and the second neck of the container extends through the aperture in the closed end of the second envelope.
Finally, in any of the embodiments, the envelope-enclosed container is then covered by a second layer of plastic to stabilize and protect the enclosed container.
This can be accomplished by spraying a layer of resin on the envelope-enclosed container, by putting the envelope~
enclosed container back into a mold and molding a layer of plastic onto it, or by shrinking a heat-shrinkable plastic over the envelope-enclosed container. This second layer of plastic may be of the same or a different plastic as the inner molded plastic container.
.
~x~3063 A sectional view of the layers in the final product is shown iD E`igure ~. The reinforced plastic pressure container has a molded plastic interior 18 which provides corrosion resistance, a reinforcing fiber layer 19 comprised of one or more layers of fabric, which provides strength to withstand pressurization and an outer plastic coating 20 which stabilizes and protec-ts khe reinforcing material.
It is intended that the material of which the container is molded be flexible enough to expand readily into the reinforcing fiber layer and transfer all pressuri-; zation loads to it. It is also intended that the material be selected primarily for its low cost and resistance to degradation by pressure and air system contaminants.
15As shown in Figure 5, each neck oE the container may have -threaded metal inserts 15 and 16 molded into it, as shown in -the finished vessel of Figure 5. The molded-in inserts may be oE multiple-port design 17 to eliminate -the need for a manifold on the neck to obtain multiple inlets and/or outlets from the vessel. ~ drain hose 18 may be attached to one of the molded-in inserts, as shown in Figure 5, to allow water and other contaminants to be expelled from the vessel through the neck.
The stabilizing and protecting outer resin cover may have bosses molded into it for the purpose of mounting the finished vessel to another structure or for mounting valves or other equipment to the vessel.
From the foregoing it will be appreciated that, although specific embodiments of the invention have been described herein for purposes of ill-ustration, various modifications may be made without deviatin~ from the spirit and scope of the invention. Accordingly, the invention is not limited except as by the appended claims.
G
AND METHOD O~ MAKlNG SAME
Technical Field This invention rela-tes, in general, to the manufacture of fiberglass-reinrorced plastic pressure vessels ~or s-toring compressed gases. The inven-tion is also directed to methods of making compressed air tanks for use in truck braking systems.
Back~round A_ Vessels or air tanks which are capable oE with-standing internal pressure are necessary in the braking andother systems on trucks. Such vessels when constructed of steel have several disadvantages. First, they are subject to corrosion from moisture and other contaminants found in compressed air systems. E~forts to coat the inside of these tanks with corrosion~resistant substances have not been totally successful. Second, they are heavy, which is a disadvantage in truck applications where the contribution of the weight of the vessel to chassis weight must displace payload.
A corrosion-resistant thermoplastic material would seem to overcome these disadvantages. Vessels constructed from thermoplastic materials have a larger strength-to-weight ratio than steel vessels. Ho~ever, current thermoplastic materials do not possess su~ficient strength to withstand -the opera~ing pressures o~ truck air systems unless they are reinforced with another material.
Typically, rein~orcement of plastic pressure vessels has been accomplished by winding filaments of a very high strenyth and sti~fness around the tank. This process is time-consuming and requires special winding equipment to accomplish a uniform application o~ a reinforcing filament .. .
, .
: . , 3~)~3 layer. Typical of these systems is the apparatus shown in Laibson, U.S. Patent No. 3,508,677. The process is expen-sive and has been limited to low production volumes and specialized tanks. It is prohibitively expensi~e for the manufacturer of truck air tanks and the like. Accordingly, it would be desirable in the ar-t to achieve a method o~
producing a reinforced plastic pressure vessel without -the need for winding filamen-tary material around the vessel.
Disclosure of Invention . . .
It is a primary objective oE the lnvention to provide a method for economically producing a reinEorced plastic vessel for compressed air or other pressurized fluids.
lS A further objective is to provide a method for producing a reinforced pressure vessel without the need for winding reinforcing material around the vessel.
A further objective i5 to produce a reinforced plastic vessel for compressed air for use in the bra]cing systems of trucks.
The present invention discloses a method for producing a reinforced molded plastic vessel by first fashioning a cylindrically shaped, hollow plas-tic container having a neck, with a passage extending through the neck to allow move~ent of fluid through the neck into and out of the container. The container is then enclosed by a cylin-drically shaped fabric envelope. The envelope has an open end which is dimensioned to slide over the container such that the open end of the envelope is fitted tightly around the neck end of the container and the envelope thereby encloses the container snugly. Finally, a layer oE
protective and stablizing plastic is applied to the ; envelope-enclosed container.
In a preferred embodiment of the invention~ the fabric envelope has, at its open end, drawstxings which allow the open end of the envelope to be closed snugly 3~3~3 around the neck of the con-tainer. The plastic container may have threaded me-tal inserts molded into its neck.
In a second preferred embodiment of the inven-tion, a second outer envelope covers the envelope-enclosed container before the outer plastic layer is applied. This second outer envelope is also cylindrical and has an opened and a closed end; however, lhe closed end of the outer envelope has an aper-ture which is dimensioned to allow the neck of the container to pass therethrough. After the outer envelope is slid onto the envelope-enclosed ; container, a protective ancl stablizing plastic is applied to -the doubly envelope-enclosed container. The plastic container may have threaded metal inserts molded into its neck.
In a third preferred embodiment of the invention, the hollo~ plastic container is fashioned to have two necks, located at opposite ends of the cylindrically shaped container. Each neck may have threaded metal inserts molded into it. Two cylindrically shaped envelopes are fashioned, each having an open end and a closed end, the closed end having an aperture dimensioned to allow one neck of the container to pass therethrough. One envelope is slid over the double-necked container such that the envelope covers the container and one neck of the container ~:25 extends through the aperture in the closed end of the envelope. Then, the second envelope is slid over the envelope-enclosed container such that the second envelope covers the envelope-enclosecl container and the second neck :of the container extends through the aperture in the closed 30 end of the second envelope. After the second envelope is properly situated, a protective and stabilizing plastic is applied to the doubly envelope-enclosed container.
Brie~ Descri~tion of the Drawlnqs Figure 1 is a side elevational view oE a thermo-plastic vessel used in this invention before reinforcement.
-' '' ' ~ ' ' ' ' . ~ ~X~33()63 Figure 2 is a top view of the vessel before reinforcement.
Figure 3 is a side view of a fabric envelope being drawn over the plastic vessel in the first pre~erred embodiment.
Figure 4 is a side view of the two fabric e~velopes being drawn over the plastic vessel in opposite directions in the second preferred embodiment.
Figure 5 is a side view of the finished vessel having two necks.
Figure 6 is an enlarged ~ectional view of a wall increment made in accordance with the present invention.
Best Mode for Carrying Out the Invention This invention discloses a method for construct-ing a reinforced plastic pressure vessel in a sandwich-type construction. The reinforced vessel's construction con-sists of an inner plastic layer, a reinforcing layer and an outer stablizing plastic layer.
A hollow thermoplastic container 9 of the desired shape and volume is molded by one of several common processes, such as blow molding or rotational molding. As Figure 1 demonstrates, the container has a neck 10 molded out of the plastic which serves as an opening through which f]uid can flow into and out of the container. As shown in Figure 2, the container is cylindrical in shape.
Next, a reinforcing fabric envelope is then woven or knitted separately from a filament-type reinforcing material such as glass, graphite or boron fibers.
Alternatively, the envelope may be constructed from metal wires or mesh, or high modulus organic materials, such as aramidt or any other high strength fiber materials. The envelope is fashioned to such dimensions as to fit snugly over the container.
The envelope 11 is then pulled over the molded container so that the open end of the envelope is located at the neck end of the container. This is shown in Figure ~ ;, 3~)~i3 3. The open end of the envelope can be drawn tight by means of draw strings 12 so that the open end of the envelope fits snugly around the neck of the container.
Alternatively, after the first envelope is pulled over the container, a second envelope 13 is also pulled over the container -to cover the first envelope. This is shown in Eigure 4. The second envelope is pulled on from the opposite end and has an aperture 14 knitted or woven into its closed end so that the neck of the container ma~
extend through the closed end of the second envelope.
In another alternative, the plastic container is molded with two necks, one at each end of the cylindrically shaped container as shown in Figure 5. Two cylindrically shaped envelopes are then fashioned from fiberglass, i.e., by knitting or weaving techniques. Each envelope has an open end and a closed end, the closed end having an aperture dimensioned to allow a neck of the container to pass therethrough. The first envelope is slid over the double-necked container such that the envelope covers the container and one neck of the container extends through the aperture in the closed end o~ the envelope. The second envelope is then slid over the envelope-enclosed container such that the second envelope covers the envelope-enclosed container and the second neck of the container extends through the aperture in the closed end of the second envelope.
Finally, in any of the embodiments, the envelope-enclosed container is then covered by a second layer of plastic to stabilize and protect the enclosed container.
This can be accomplished by spraying a layer of resin on the envelope-enclosed container, by putting the envelope~
enclosed container back into a mold and molding a layer of plastic onto it, or by shrinking a heat-shrinkable plastic over the envelope-enclosed container. This second layer of plastic may be of the same or a different plastic as the inner molded plastic container.
.
~x~3063 A sectional view of the layers in the final product is shown iD E`igure ~. The reinforced plastic pressure container has a molded plastic interior 18 which provides corrosion resistance, a reinforcing fiber layer 19 comprised of one or more layers of fabric, which provides strength to withstand pressurization and an outer plastic coating 20 which stabilizes and protec-ts khe reinforcing material.
It is intended that the material of which the container is molded be flexible enough to expand readily into the reinforcing fiber layer and transfer all pressuri-; zation loads to it. It is also intended that the material be selected primarily for its low cost and resistance to degradation by pressure and air system contaminants.
15As shown in Figure 5, each neck oE the container may have -threaded metal inserts 15 and 16 molded into it, as shown in -the finished vessel of Figure 5. The molded-in inserts may be oE multiple-port design 17 to eliminate -the need for a manifold on the neck to obtain multiple inlets and/or outlets from the vessel. ~ drain hose 18 may be attached to one of the molded-in inserts, as shown in Figure 5, to allow water and other contaminants to be expelled from the vessel through the neck.
The stabilizing and protecting outer resin cover may have bosses molded into it for the purpose of mounting the finished vessel to another structure or for mounting valves or other equipment to the vessel.
From the foregoing it will be appreciated that, although specific embodiments of the invention have been described herein for purposes of ill-ustration, various modifications may be made without deviatin~ from the spirit and scope of the invention. Accordingly, the invention is not limited except as by the appended claims.
G
Claims (16)
1. A method of constructing a reinforced plastic pressure vessel, comprising:
fashioning a plastic, hollow cylindrical container having a neck at one end and having a passage extending through the neck into the container;
fashioning a fabric envelope having an open end and dimensioned to enclose the container snugly, and designed to reinforce and add strength to the plastic container;
enclosing the plastic a container with the fabric envelope by sliding the envelope over the container such that the open end of the envelope is situated at the neck end of the container, wherein the fabric envelope reinforces the plastic container and provides strength to withstand and pressurization;
applying a layer of protective and stabilizing plastic to the envelope-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelope, and layer of protective and stabilizing plastic form an integral product.
fashioning a plastic, hollow cylindrical container having a neck at one end and having a passage extending through the neck into the container;
fashioning a fabric envelope having an open end and dimensioned to enclose the container snugly, and designed to reinforce and add strength to the plastic container;
enclosing the plastic a container with the fabric envelope by sliding the envelope over the container such that the open end of the envelope is situated at the neck end of the container, wherein the fabric envelope reinforces the plastic container and provides strength to withstand and pressurization;
applying a layer of protective and stabilizing plastic to the envelope-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelope, and layer of protective and stabilizing plastic form an integral product.
2. The method of claim 1, further comprising a threaded metal insert molded into the neck of the container.
3. The method of claim 2 wherein the open end of the fabric envelope further comprises drawstrings to allow closing the envelope snugly around the neck of the container, and further including the step of tightening the drawstrings to close the envelope after the envelope is positioned fully over the container.
APPENDIX A . . . i
APPENDIX A . . . i
4. The method of claim 2, further comprising:
fashioning an outer fabric envelope having an open end and a closed end, said closed end having an aperture dimensioned to allow the neck of the container to extend therethrough, said envelope dimensioned to enclose the envelope-enclosed container snugly; and covering the envelope-enclosed container with the outer envelope before application of the outer plastic layer, by sliding the outer envelope over the envelope-enclosed container such that the closed end of the outer envelope is situated at the neck end of the envelope-enclosed container, and such that the neck extends through the aperture in the closed end of the outer envelope.
fashioning an outer fabric envelope having an open end and a closed end, said closed end having an aperture dimensioned to allow the neck of the container to extend therethrough, said envelope dimensioned to enclose the envelope-enclosed container snugly; and covering the envelope-enclosed container with the outer envelope before application of the outer plastic layer, by sliding the outer envelope over the envelope-enclosed container such that the closed end of the outer envelope is situated at the neck end of the envelope-enclosed container, and such that the neck extends through the aperture in the closed end of the outer envelope.
5. A reinforced plastic pressure vessel produced by:
fashioning a plastic, hollow cylindrical container having a neck at one end and having a passage extending through the neck into the container;
fashioning a fabric envelope having an open end and dimensioned to enclose the container snugly, and designed to reinforce and add strength to the plastic container;
enclosing the plastic container with the fabric envelope by sliding the envelope over the container such that the open end of the envelope is situated at the neck end of the container, wherein the fabric envelope reinforces the plastic container and provides strength to withstand pressurization; and applying a layer of protective and stabilizing plastic to the envelope-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelope, and layer of protective and stabilizing plastic form an integral product.
APPENDIX A . . . ii
fashioning a plastic, hollow cylindrical container having a neck at one end and having a passage extending through the neck into the container;
fashioning a fabric envelope having an open end and dimensioned to enclose the container snugly, and designed to reinforce and add strength to the plastic container;
enclosing the plastic container with the fabric envelope by sliding the envelope over the container such that the open end of the envelope is situated at the neck end of the container, wherein the fabric envelope reinforces the plastic container and provides strength to withstand pressurization; and applying a layer of protective and stabilizing plastic to the envelope-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelope, and layer of protective and stabilizing plastic form an integral product.
APPENDIX A . . . ii
6. The vessel of claim 5, further comprising a threaded metal insert molded into the neck of the container.
7. The vessel of claim 5 wherein the open end of the fabric envelope further comprises drawstrings to allow closing the envelope snugly around the neck of the container.
8. The vessel of claim 5, further comprising:
fashioning an outer fabric envelope having an open end and a closed end, said closed end having an aperture dimensioned to allow the neck of the container to extend therethrough, said envelope dimensioned to enclose the envelope-enclosed container snugly; and covering the envelope-enclosed container with the outer envelope, before application of the outer plastic layer, by sliding the outer envelope over the envelope-enclosed container such that the closed end of the outer envelope is situated at the neck end of the envelope-enclosed container, and such that the next extends through the aperture in the closed end of the outer envelope.
fashioning an outer fabric envelope having an open end and a closed end, said closed end having an aperture dimensioned to allow the neck of the container to extend therethrough, said envelope dimensioned to enclose the envelope-enclosed container snugly; and covering the envelope-enclosed container with the outer envelope, before application of the outer plastic layer, by sliding the outer envelope over the envelope-enclosed container such that the closed end of the outer envelope is situated at the neck end of the envelope-enclosed container, and such that the next extends through the aperture in the closed end of the outer envelope.
9. A method of constructing a reinforced plastic pressure vessel, comprising:
fashioning a plastic, hollow cylindrical container having two necks located at opposite ends of the container, each neck having a passage extending through the neck into the container;
fashioning two envelopes, each having ah open end and a closed end, where the closed end has an aperture dimensioned to allow a neck of the container to extend therethrough, and where each envelope is dimensioned to enclose the container snugly, and further where each envelope is designed to reinforce and add strength to the plastic container;
APPENDIX A . . . iii enclosing the hollow plastic container with the first envelope by sliding the envelope over the container such that the envelope encloses the container and the first neck of the container extends through the aperture in the closed end of the first envelope, wherein the first fabric envelope reinforces the plastic container and provides strength to withstand pressurization;
covering the envelope-enclosed container with the second envelope by sliding the second envelope over the envelope-enclosed container such that the second envelope encloses the envelope-enclosed container and the second neck of the container extends through the aperture in the closed end of the second envelope, wherein the second fabric envelope reinforces the plastic container and provides strength to withstand pressurization; and applying a layer of protective and stabilizing plastic to the doubly envelop-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelopes, and layer of protective and stabilizing plastic form an integral product.
fashioning a plastic, hollow cylindrical container having two necks located at opposite ends of the container, each neck having a passage extending through the neck into the container;
fashioning two envelopes, each having ah open end and a closed end, where the closed end has an aperture dimensioned to allow a neck of the container to extend therethrough, and where each envelope is dimensioned to enclose the container snugly, and further where each envelope is designed to reinforce and add strength to the plastic container;
APPENDIX A . . . iii enclosing the hollow plastic container with the first envelope by sliding the envelope over the container such that the envelope encloses the container and the first neck of the container extends through the aperture in the closed end of the first envelope, wherein the first fabric envelope reinforces the plastic container and provides strength to withstand pressurization;
covering the envelope-enclosed container with the second envelope by sliding the second envelope over the envelope-enclosed container such that the second envelope encloses the envelope-enclosed container and the second neck of the container extends through the aperture in the closed end of the second envelope, wherein the second fabric envelope reinforces the plastic container and provides strength to withstand pressurization; and applying a layer of protective and stabilizing plastic to the doubly envelop-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelopes, and layer of protective and stabilizing plastic form an integral product.
10. The method of claim 9, further comprising a threaded metal insert molded into each neck of the container.
11. A reinforced plastic pressure vessel produced by:
fashioning a plastic hollow cylindrical container having two necks located at opposite ends of the container, each neck having a passage extending through the neck into the container;
fashioning two envelopes, each having an open end and a closed end, where the closed end has an aperture dimensioned to allow a neck of the container to extend therethrough, and where each envelope is dimensioned to enclose the container snugly, and further where each APPENDIX A . . . iv envelope is designed to reinforce and add strength to the plastic container;
enclosing the hollow plastic container with the first envelope by sliding the envelope over the container such that the envelope encloses the container and the first neck of the container extends through the aperture in the closed end of the first envelope, wherein the first fabric envelope reinforces the plastic container and provides strength to withstand pressurization;
covering the envelope-enclosed container with the second envelope by sliding the second envelope over the envelope enclosed container such that the second envelope encloses the envelope-enclosed container and the second neck of the container extends through the aperture in the closed end of the second envelope, wherein the fabric envelope reinforces the plastic container and provides strength to withstand pressurization; and applying a layer of protective and stabilizing plastic to the doubly envelope-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelopes, and layer of protective and stabilizing plastic form an integral product.
fashioning a plastic hollow cylindrical container having two necks located at opposite ends of the container, each neck having a passage extending through the neck into the container;
fashioning two envelopes, each having an open end and a closed end, where the closed end has an aperture dimensioned to allow a neck of the container to extend therethrough, and where each envelope is dimensioned to enclose the container snugly, and further where each APPENDIX A . . . iv envelope is designed to reinforce and add strength to the plastic container;
enclosing the hollow plastic container with the first envelope by sliding the envelope over the container such that the envelope encloses the container and the first neck of the container extends through the aperture in the closed end of the first envelope, wherein the first fabric envelope reinforces the plastic container and provides strength to withstand pressurization;
covering the envelope-enclosed container with the second envelope by sliding the second envelope over the envelope enclosed container such that the second envelope encloses the envelope-enclosed container and the second neck of the container extends through the aperture in the closed end of the second envelope, wherein the fabric envelope reinforces the plastic container and provides strength to withstand pressurization; and applying a layer of protective and stabilizing plastic to the doubly envelope-enclosed container, to produce a reinforced plastic pressure vessel wherein the container, fabric envelopes, and layer of protective and stabilizing plastic form an integral product.
12. The vessel of claim 11, further comprising a threaded metal insert molded into each neck of the container.
13. A reinforced plastic pressure vessel, comprising:
an inner plastic hollow container:
knitted fabric envelope snugly fitted over the entire container, wherein the fabric envelope reinforces and adds strength to the plastic container; and a plastic coating joining said envelope to said container, whereby expansion of the plastic container from internal pressurization is resisted by the envelope.
APPENDIX A . . . v
an inner plastic hollow container:
knitted fabric envelope snugly fitted over the entire container, wherein the fabric envelope reinforces and adds strength to the plastic container; and a plastic coating joining said envelope to said container, whereby expansion of the plastic container from internal pressurization is resisted by the envelope.
APPENDIX A . . . v
14. The vessel of claim 13 wherein said vessel has an opening defined by a narrow neck, and wherein said envelope includes a drawstring adjacent to the neck for positioning the envelope tightly around the neck.
15. The vessel of claim 13 wherein said envelope includes two separate layers, one said layer overlying and contacting a first part of the container, and. the second layer overlying and contacting a second part of the container, and also overlying and contacting a portion of said first layer.
16. The vessel of claim 13 wherein the vessel contains pressurization air for use on a wheeled vehicle and includes air fittings for connecting the vessel to an air supply system of the vehicle.
APPENDIX A . . . vi
APPENDIX A . . . vi
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82839386A | 1986-02-11 | 1986-02-11 | |
| US06/828,393 | 1986-02-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1283063C true CA1283063C (en) | 1991-04-16 |
Family
ID=25251672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000519672A Expired - Lifetime CA1283063C (en) | 1986-02-11 | 1986-10-02 | Reinforced molded plastic tank for compressed air and method of making same |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU594085B2 (en) |
| CA (1) | CA1283063C (en) |
| MX (1) | MX161733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3572200A1 (en) * | 2018-05-22 | 2019-11-27 | Cipax AB | A method for reinforcing a rotational-molded tank and a rotational-molded tank |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9007914D0 (en) * | 1990-04-06 | 1990-06-06 | Short Brothers Plc | Bagging arrangement for synthetic resin component processing apparatus |
| DE4107882C2 (en) * | 1991-03-12 | 1994-08-18 | Eugen Ehs | Method and device for manufacturing pressure vessels and pressure vessels |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4589562A (en) * | 1981-05-04 | 1986-05-20 | Fawley Norman | Structures reinforced by a composite material |
-
1986
- 1986-10-02 CA CA000519672A patent/CA1283063C/en not_active Expired - Lifetime
- 1986-10-08 AU AU63665/86A patent/AU594085B2/en not_active Ceased
- 1986-12-19 MX MX473186A patent/MX161733A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3572200A1 (en) * | 2018-05-22 | 2019-11-27 | Cipax AB | A method for reinforcing a rotational-molded tank and a rotational-molded tank |
Also Published As
| Publication number | Publication date |
|---|---|
| AU594085B2 (en) | 1990-03-01 |
| AU6366586A (en) | 1987-08-13 |
| MX161733A (en) | 1990-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |