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Número de publicaciónUS3908902 A
Tipo de publicaciónConcesión
Fecha de publicación30 Sep 1975
Fecha de presentación26 Oct 1973
Fecha de prioridad26 Oct 1973
Número de publicaciónUS 3908902 A, US 3908902A, US-A-3908902, US3908902 A, US3908902A
InventoresCollins Benjamin P, Novello John J
Cesionario originalCollins Synthetics Inc
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Molded or extruded synthetic railroad ties, beams and structural members
US 3908902 A
Resumen
This invention relates to railroad ties and the like, such as beams and structural members, and particularly to articles of recycled wood and to the process of making the same.
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Descripción  (El texto procesado por OCR puede contener errores)

United States Patent 1191 Collins et al.

[ 51 Sept. 30, 1975 22 Filed: Oct. 26, 1973 211 Appl. No; 410,171

[52] US. Cl 238/83; 260/9; 260/174 R [51] Int. Cl. E01B 3/02 [58] Field of Search 260/17, 16, 9; 238/83,

[56] References Cited UNlTED STATES PATENTS 598.127 2/1898 1 623,185 4/1927 3.463.746 8/1969 3,598,312 8/1971 Hamilton, Jr. 238/84 Primary Examiner-M. Henson Wood, Jr Assistant E.\'uminerRichard A. Bcrtsch Attorney, Agent, or FirmSmythe & Moore [57] ABSTRACT This invention relates to railroad ties and the like, such as beams and structural members, and particularly to articles of recycled wood and to the process of making the same.

4 Claims, 3 Drawing Figures US. Patent Sept. 30,1975

MOLDED OR EXTRUDED SYNTHETIC RAILROAD TIES, BEAMS AND STRUCTURAL MEMBERS This invention relates to railroad ties, beams and structural members made from waste wood.

Railroad ties have been made of wood for many years, the ties being placed on rock ballast and having the steel rails carried thereon and fastened thereto, such as by spikes or the like. Wood deteriorates in spite of being impregnated with a preservative, such as creosote. The ties are of such a size that wood must be obtained from large size trees without defects, such as splits, and suitable lumber or wood is becoming scarce. Other types of material, such as concrete or metal, have not been satisfactory because of weight and improper resiliency. Also, concrete is subject to cracking because of water freezing. Due to the aforementioned scarcity of lumber, beams and similar structural members of high strength also have been expensive and difficult to obtain. It is known to make thin particle board from wood chips and thermosetting resins, such as in U.S. Pat. No. 3,463,746.

One of the objects of the invention is to provide an improved railroad tie, structural member, or the like, which is relatively inexpensive and yet will perform satisfactorily in service and the method of making the same.

In one aspect of the invention, recycled comminuted railroad ties, as well as waste wood, such as wood chips or bark, can be mixed with thermoplastic polyester resin and catalyst and subjected to high pressure and heat to form a railroad tie, structural beam or the like. The term structural beam is meant to include load bearing members for buildings or other structural use. The mixture also can include fire retardants and reinforcing means, such as wood slabs as obtained in lumber milling operations. The waste wood has its moisture content controlled so as to have a moisture retention of at least 30 percent by weight. The ties and beams have a relatively high density in the range of 50 to 70 lbs. per cu. ft. and with a high strength.

Other objects, advantages and features of the present invention will become apparent from the accompanying description and drawings, which are merely exemplary.

IN THE DRAWINGS FIG. 1 is a fragmentary perspective view of a tie with rails thereon;

FIG. 2 is a schematic view of one manner of making a tie; and

FIG. 3 is a fragmentary perspective sectional view of a tie showing the chips therein.

Referring to FIG. 1, a railroad tie is normally partially embedded or laid on crushed rock ballast 11. Rails 12, 13 are laid on top of tie 10 and can be held in place in various known manners, such as by spikes 14, 15.

Old or used railroad ties can be cut or comminuted or made into wood chips for use in producing the tie of the present invention. If the tie has creosote therein and it is deemed necessary, the creosote can be removed in any known manner, such as acetone or the like.

Other waste wood products, such as bark resulting from lumber milling or chips produced in milling, can be used as will appear hereafter. Merely by way of example, the chips can be A to /2 inch in length and the comminuted tie fibers can be inch long.

The recycled tie chips or fibers and/or the waste wood is mixed with thermoplastic polyester resin and then placed in a mold and pressed under heat and pressure.

Alternatively, the mixture can be extruded as shown in FIG 2. The waste wood to be extruded along with the resin and additives are placed in hopper 16 and extruded through dies 17 by screw 18 to a receiving station 19. Heat is applied as is known in the extrusion art. The finished tie 20 or structural member is sized as desired. Other suitable catalysts can be used, including those which do not require external heat for action.

The waste wood should be dried or treated before molding or extrusion so that it has a moisture retention of at least approximately 30 percent by weight and preferably about 35 percent.

As one specific example, a tie or beam can be produced which is composed of:

Percentage by Weight Waste wood 50% Polyester resin, GR l 17 25% Aluminum hydrate, Alcoa 33l 23% Benzyl peroxide powder catalyst 1% Dimethyl aniline catalyst 1% The thermoplastic resin is that furnished by W. R. Grace Co. under the identification of GR 1 17. Greater flexibility in the ties and beams was obtained by using a polyester resin furnished by W. R. Grace under the identification of GR 14010.

Aluminum hydrate can be added to the mix together with the catalyst for the polyester resin.

The structural member can have a composition in accordance with the following approximate ranges:

Percentage by Weight Waste wood 38% 65% Aluminum hydrate 25% 23% Polyester resin GR 1 17 or GR l40lO 35% 10% Dimethyl aniline 1% 1% Catalyst Benzyl peroxide powder 1% 1% mixed with When placed in a mold, a pressure of 300 to 800 p.s.i. can be applied for 15 to 30 minutes at 250F. to 300F. A density of 50 to lbs. per cu. ft. is obtained.

As a reinforcing means, slabs of wood also could be included in the mix. As an example, ties are normally 8 feet 6 inches to 9 feet 0 inch in length and are approximately 6 inches X 8 inches or 7 inches X 9 inches in cross section. The slabs can extend longitudinally in the member to within about 2 inches of each end, there being a single slab, more than one slab, or overlapping slabs.

It should be apparent that changes in details of construction and arrangement of parts may be made without departing from the spirit of the invention except as defined in the appended claims.

What is claimed is:

1. A waste wood structural member composed of:

Percentage by Weight Benzyl peroxide powder mixed with 2. A waste wood structural member as claimed in claim 1 wherein the structural member is a railroad tie. 3. A waste wood structural member composed of:

Percentage by Weight Waste wood 50% Polyester resin. GR l 17 25% Aluminum hydrate, Alcoa 33] 23% Bcnzyl peroxide powder catalyst l% Dimethyl aniline catalyst 4. A waste wood structural member as claimed in claim 3 wherein the structural member is a railroad tie.

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US598127 *10 May 18971 Feb 1898 Half to john j
US1623185 *17 Jul 19265 Abr 1927Hinde James JRailway tie
US3463746 *21 Nov 196626 Ago 1969Canadian IndParticle board
US3598312 *16 Dic 196810 Ago 1971Portec IncSynthetic crosstie
Citada por
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US4105159 *6 Oct 19768 Ago 1978Brown Gordon EldredComposite railroad tie
US4108377 *1 Mar 197622 Ago 1978Edward PotterNon-metallic-reinforced molded crosstie
US4150790 *20 Jun 197524 Abr 1979Edward PotterReinforced molded lignocellulosic crosstie and railway assembly
US4824627 *12 Abr 198825 Abr 1989Floyd V. HammerMethod of making a molded plastic product
US5413745 *21 Jul 19929 May 1995Andersson; CurtMethod and apparatus for producing an elongated beam
US5516472 *30 Ago 199414 May 1996Strandex CorporationExtruded synthetic wood composition and method for making same
US5916932 *16 May 199729 Jun 1999Rutgers, The State UniversityComposite building materials from recyclable waste
US6153293 *4 Feb 199928 Nov 2000Dahl; Michael E.Extruded wood polymer composite and method of manufacture
US617109630 Ago 19999 Ene 2001California Cedar Products CompanyDie for making extruded pencil blank
US633626529 Mar 20008 Ene 2002Siegfried NiedermairComposite railroad cross tie and method of manufacturing same
US697121117 Mar 20046 Dic 2005Crane Plastics Company LlcCellulosic/polymer composite material
US701735225 Oct 200228 Mar 2006Crane Plastics Company LlcCooling of extruded and compression molded materials
US7172136 *14 Mar 20056 Feb 2007Joseph LeonStructural members fabricated from waste materials and method of making the same
US718645727 Nov 20026 Mar 2007Crane Plastics Company LlcSiding panel composite material of cellulosic filler, PVC resin and chlorinated polyethylene; durable and weatherable siding, exhibits the look and feel of natural wood, may be stained, painted, colored, and capped
US74106878 Jun 200412 Ago 2008Trex Co IncBuilding material, a decking material, a railing component, and a decking board; wood fibers blended with the crystalline polymer
US74492291 Nov 200211 Nov 2008Jeld-Wen, Inc.Comprising cellulose material such as wood chips, thermoset polymer, a petroleum distillate, a release agent, and a catalyst
US774356719 Ene 200729 Jun 2010The Crane Group Companies LimitedFiberglass/cellulosic composite and method for molding
US807433931 Dic 200713 Dic 2011The Crane Group Companies LimitedMethods of manufacturing a lattice having a distressed appearance
US81672756 Jul 20101 May 2012The Crane Group Companies LimitedRail system and method for assembly
US822166315 Dic 200817 Jul 2012Nova Chemicals Inc.Method of making cellulosic filled thermoplastic composites of an anhydride containing copolymer
US846079710 Dic 200911 Jun 2013Timbertech LimitedCapped component and method for forming
DE2826410A1 *16 Jun 197820 Dic 1979Edward Potter And Dant & RusseBahnschwelle
WO1995013179A1 *10 Nov 199418 May 1995Strandex CorpExtruded synthetic wood composition and method for making same
WO2000021749A1 *14 Oct 199920 Abr 2000Reconstituted Technologies IncMolded railroad tie and method for making same
WO2003011543A1 *25 Jul 200213 Feb 2003Joseph Alfred LeonStructural members fabricated from waste materials and method of making the same
Clasificaciones
Clasificación de EE.UU.238/83, 524/34, 264/109, 524/14, 524/16
Clasificación internacionalE01B3/44, E01B3/00
Clasificación cooperativaE01B3/44
Clasificación europeaE01B3/44