EP1023989A1 - Rubber baler with extended service life - Google Patents
Rubber baler with extended service life Download PDFInfo
- Publication number
- EP1023989A1 EP1023989A1 EP99101388A EP99101388A EP1023989A1 EP 1023989 A1 EP1023989 A1 EP 1023989A1 EP 99101388 A EP99101388 A EP 99101388A EP 99101388 A EP99101388 A EP 99101388A EP 1023989 A1 EP1023989 A1 EP 1023989A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- ram head
- press wall
- baling apparatus
- ram
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
- B30B9/3003—Details
- B30B9/3032—Press boxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
- B30B9/3003—Details
- B30B9/3021—Press rams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
- B30B9/3003—Details
- B30B9/3014—Ejection means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
A improved service life baler press assembly including a number of novel press
chamber and ram assembly components formed of a relatively hard material, such as a
thermoplastic polymer (e.g., acetal resins) or any other suitable material having low static
and dynamic coefficients of friction. Press chamber components according to the invention
include press wall liners coupled to the press chamber walls. The press wall liners are
manufactured of the thermoplastic polymer, and are disposed between the press walls and
a ram head during period of compression. The low static and dynamic coefficients of
friction of the thermoplastic polymer material allow the ram head to move inside of the
press chamber without damaging the walls of the press chamber. In addition, one
embodiment of the present invention includes a ram head cover also composed of a
thermoplastic polymer or other suitable material. The ram head cover reduces wear damage
to the press wall liners. The surface area of a traditional ram head can be reduced to accept
the ram head cover. The interaction between the various press chamber components
reduces the contamination of rubber (or any other compressible material) by preventing
metal cuttings from being formed during extended use. The disclosed press wall liners also
feature a unique interlocking configuration that prevents rubber from migrating through the
junctions of the wall liners.
Description
- The present invention relates to presses and baling equipment, and more particularly to a reduced-maintenance rubber baler utilizing thermoplastic or polymer materials having low static and dynamic coefficients of friction to improve structural components such as press chamber liners and platen or ram head covers.
- Baling machines come in many shapes and sizes, and are used to transform loose materials into solid blocks having a variety of uses. In typical baling machines, such as the type used to bale rubber products, rubber or other compressible material is fed into a press chamber by a conveyor belt or by screw conveyor. The material is then compressed in the press chamber by a hydraulic ram having a ram head or platen until a relatively solid block is formed. The block is then ejected and the process is repeated to form additional blocks.
- Many rubber baling machines utilize steel for the press chamber walls, press chamber liners, ram head or platen covers, and wear strips about the press or mold chamber. Steel fragments resulting from grinding and wear on these steel components often results in metal contamination of the rubber product. This contamination sometimes causes the product to be rejected for uses requiring rubber of high purity in which even trace amounts of metal render the blocks useless. Further problems arise because the liner plates are often simply metal sheets butted up against one another. Rubber can migrate between the comers or junctions between these plates, causing misalignment between the press chamber and the hydraulic ram. Rubber extrusion between the steel components also results in product loss.
- Attempts have been made to combat these problems. For example, the wear strips in many presses are comprised of materials other than steel in order to reduce frictional wear of steel press chamber walls due to movement of the ram head. Without frequent and time-consuming maintenance, however, the wear strips often become worn to the point of causing the press to become misaligned. In turn, misalignment frequently results in scoring of the steel press chamber walls and product contamination. The maintenance required for these prior art baling machines therefore results in less than desirable overall operating costs.
- Briefly, a baler press assembly according to the present invention includes a number of novel press chamber and ram assembly components formed of a relatively hard material, such as a thermoplastic polymer (e.g., acetal resins) or any other suitable material having low static and dynamic coefficients of friction.
- Press chamber components according to the invention include press wall liners coupled to the press chamber walls. The press wall liners are manufactured of the thermoplastic polymer or other suitable material, and are disposed between the press walls and the ram head during period of compression. The low coefficients of friction of the thermoplastic polymer material allows the ram head to easily move inside of the press chamber without damage to the walls of the press chamber. In addition, one embodiment of the present invention includes a ram head cover also composed of the thermoplastic polymer or other suitable material. The ram head cover reduces wear damage to the press wall liners. The surface area of a traditional ram head can be reduced to accept the ram head cover. The interaction between the various press chamber components reduces the contamination of rubber (or any other compressible material) by preventing metal cuttings from being formed during extended use. The disclosed press wall liners also feature a unique interlocking configuration that prevents rubber from migrating through the junctions of the wall liners.
- The improved components of the present invention can be scaled for use in a baler press assembly of any size. In addition to producing a higher-quality end product, it has been determined through lengthy experimentation that a baler press assembly incorporating these improved components has an improved service life, requiring much less maintenance than traditional baler presses.
- A better understanding of the present invention can be obtained when the following detailed description of the preferred embodiment is considered in conjunction with the following drawings, in which:
- Figures 1 A and 1 B depict side and front views, respectively, of an upstroke baler press incorporating components according to the present invention;
- Figure 2 is a perspective view of a prior art ram head;
- Figure 3 shows a perspective view of a ram head according to the present invention;
- Figure 4 is an exploded view of the press chamber components according to the present invention;
- Figure 5A - 5D are isomeric views of press wall liners according to the invention;
- Figure 6 is an isomeric view of an interlocking press wall liner junction in accordance with the invention;
- Figure 7 is a perspective view of a ram head cover according to the present invention; and
- Figure 8 is a cross sectional view of the ram head cover of Figure 7.
-
- Turning now to the drawings, Figures 1A and 1B show side and front views, respectively, of an exemplary upstroke baler press assembly B incorporating novel components according to the present invention. The baler press assembly B is capable of producing high quality rubber bales and requires much less maintenance than prior balers. Only relevant portions of the baler press assembly B are shown; other portions are well known to those skilled in the art and are not discussed herein for sake of clarity.
- In the disclosed embodiment of the invention, the baler press assembly B includes press chamber B formed of reduced wear components comprised of a thermoplastic polymer or other suitable material of the type described below. The baler press assembly B also includes a
bale ejector assembly 11 and aram assembly 12. During normal operation, rubber chips or other compressible materials are supplied to the press chamber B via a conveyor belt (not shown). The presschamber top liner 19 is then positioned over the press chamber B and theram assembly 12 is activated. - The disclosed
ram assembly 12 is comprised of ahydraulic rod 14 positioned within a rod housing andscraper 15. Aram head 16 is secured to the end of thehydraulic rod 14. In turn, aram head cover 18 comprised of a thermoplastic polymer or other suitable material is secured to theram head 16. Theram head 16 andram head cover 18 are described below in greater detail in conjunction with Figures 2 - 3 and 7 - 8. Theram assembly 12 is coupled to thepress walls 20 viasocket cap screws 17. - Upon activation, hydraulic power is applied to the
ram assembly 12 such that thehydraulic rod 14 travels in an upward direction, forcing theram head 16 and ram head cover 18 into thepress chamber 10. The baler press assembly B is powered by a hydraulic power unit (not shown). Hydraulic power from the power unit is supplied to the baler press assembly B at a number ofpower connection points 30. The compression force applied by theram assembly 12 is of sufficient magnitude to form a solid bale of the compressible material contained in thepress chamber 10. Following formation of the bale, the presschamber top liner 19 is repositioned and the bale is ejected by thebale ejector assembly 11. The entire process is then repeated to form additional bales. - For purposes of this specification, the term "thermoplastic polymer" is defined to encompass the DuPont materials Delrin® and Delrin AF® and any other materials having similar relevant properties. Delrin® is an acetal resin thermoplastic polymer (or acetal homopolymer) manufactured by the polymerization of formaldehyde. Delrin AF® contains high tensile strength fibers of Teflon® fluoroplastic resin. Similar wear resistant materials having low static and dynamic coefficients of friction (as compared to steel) and capable of being formed into or bonded to press wall liners and ram head covers are considered to fall within the scope of the term thermoplastic polymer as used in the claimed invention.
- Referring more specifically to the
press chamber 10,press walls 20 function to provide a rigid support capable of withstanding the necessary compression forces.Press wall liners 22 according to the invention are secured to the inside of thepress walls 20 by means of socket cap screws 26. It is contemplated that many types of securing means could be used in place of thesocket cap screws 26, and the precise manner in which thepress wall liners 22 are secured to the press walls is not considered critical to the invention. - Referring now to Figure 2, a prior art
metal ram head 32 is shown. Thisram head 32 is comprised of abottom portion 32a that connects to thehydraulic rod 14. Atop portion 32b communicates hydraulic pressure to thepress chamber 10. In prior baler press assemblies, frictional wear between themetal press walls 20 and thetop portion 32b of theram head 32 frequently results in costly maintenance and product contamination. Aring 33 comprised of Teflon® or the like has been used to the combat this problem. Thering 33 is situated in a groove along the outer circumference oftop portion 32b of the ram head. Thering 33, however, may become worn to the point of causing the press to become misaligned. In turn, misalignment frequently results in scoring of the steel press chamber walls and product contamination. - Referring now to Figure 3, a
metal ram head 16 according to the present invention is shown. Theram head 16 includes abottom portion 16a that connects to thehydraulic rod 14 and atop portion 16b for receiving the ram head cover 18 (Figures 7 and 8). In a departure from the prior art, thetop portion 16b of theram head 16 includes a reducedsection 16c on which theram head cover 18 is secured. The reducedsection 16c includes a plurality of ram head bores 36 for receiving the mounting screws (not shown) used to attach theram head cover 18. Preferably, no portion of theram head 16 comes into frictional contact with thepress wall liners 22 during a baling cycle. - Figure 4 depicts the components of the
press chamber 10 in greater detail. Four thermoplastic polymerpress wall liners 22 interlock to form the sides of thepress chamber 10. The press wall liners are fixedly secured to thepress walls 20 of Figure 1. In the disclosed embodiment, twopress wall liners 22a are somewhat longer that the other twopress wall liners 22b, such that arectangular press chamber 10 is formed. The precise shape of thepress chamber 10 is not critical to the invention, however, and all fourpress wall liners 22 could be of equal dimensions, thereby forming asquare press chamber 10. During a baling operation, the top of thepress chamber 10 is formed by a presschamber top liner 19, which is also comprised of thermoplastic polymer in the preferred embodiment of the invention. The bottom of the press chamber is formed by the thermoplastic polymerram head cover 18, which is affixed to theram head 16. - Of import to the present invention,
ram head cover 18 prevents the metal of theram head 16 from coming into contact with thepress wall liners 22. Although thepress wall liners 22 by themselves provide improved performance over the prior art by preventing scoring of thepress walls 20, the inclusion of the ram head cover 18 further extends the service life of the baler press assembly B by reducing wear on thepress wall liners 22. The low static and dynamic coefficients of friction of the thermoplastic polymer material also reduce the hydraulic pressure necessary for the baling process. Through lengthy experimentation, it has been determined that a baler press assembly B according to the present invention has a very long service life as compared to prior baler press assemblies. In addition, reduced-friction interaction between thevarious press chamber 10 components ameliorates contamination of the rubber (or any other compressible material) by preventing the introduction of metal cuttings due to wear. - Turning now to Figures 5A - 5D, isometric views of the
press wall liners press wall liners press wall liners press walls 20. Many other types of securing means, such as rivets, could be used to secure thepress wall liners press walls 20. - In addition to the liner bores 28, each of the
press wall liners portions 23 for forming an interlocking junction between thepress wall liners 22. Turning briefly to Figure 6, a top view of an interlockingpress wall liner 22 junction is shown. In the disclosed embodiment, theextruded portions 23 of apress wall liner 22 are essentially lips formed by chamfering each end of thepress wall liner 22. When thepress wall liners 22 are installed in thepress chamber 10, theextruded portions 23 are configured to interlock in a substantially congruent manner, such that migration of the compressible material between thepress walls liners 22 is retarded. This feature of the invention further improves the service life of the baler press assembly B. - Referring now to Figures 7 and 8, a perspective view and a cross-sectional view, respectively, of the thermoplastic polymer ram head cover 18 according to the present invention are shown. As can be seen, the disclosed
ram head cover 18 includes a recessedportion 18a that is configured to receive the reducedsection 16c of theram head 16. In addition, theram head cover 18 includes a plurality of countersunk bores 34 corresponding to the bores of the reduced section of theram head 16. Again, the precise manner in which theram head cover 18 is affixed to theram head 16 is not considered critical to the invention. As mentioned, all frictional contact between theram assembly 12 and thepress chamber 10 preferably occurs between thepress wall liners 22 and theram head cover 18. - It is contemplated that the novel portions of the
baler press assembly 10 could be used in any type of press assembly having a press chamber. Further, the scope of the invention is not considered limited to rubber balers, but instead could be used in the compression of a wide variety of materials. - Thus, an improved service life baler press assembly including a number of novel press chamber and ram assembly components has been described. The press chamber and ram assembly components are formed of a material having a low coefficients of friction. In addition to extending the service life of the baler press assembly, the reduction in frictional wear interaction between the various components reduces product contamination due to metal cuttings.
- The foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the size, shape, materials, components, circuit elements, wiring connections and contacts, as well as in the details of the illustrated circuitry and construction and method of operation may be made without departing from the spirit of the invention.
- An embodiment of the present invention can provide a bailing apparatus for compressing a compressible material, the baling apparatus comprising:
- a ram assembly having a ram head;
- a plurality of press walls forming a press chamber for receiving the ram head and the compressible material, wherein compression force is provided by movement of the ram head inside the press chamber; and
- a plurality of press wall liners coupled to the press walls and disposed between the press walls and the ram head during periods of compression, wherein the plurality of press wall liners are comprised of a material having low static and dynamic coefficients of friction,
- a first one of the plurality of press wall liners having a side surface with a first extruding portion of less thickness than the general thickness of the press wall liner, a second one of the plurality of press wall liners having a side surface with a second extruding portion of less thickness than the general thickness of the press wall liner, the first and second extruding portions adapted to tightly engage such that migration of the compressible material between the plurality of press wall liners is retarded.
-
- An embodiment of the present invention can provide a baling apparatus as set out in the foregoing paragraph wherein each of the plurality of press wall liners is integral with one of the plurality of press walls.
- An embodiment of the present invention can provide a baling apparatus as set out in either of the foregoing two paragraphs wherein the first and second extruding portions are lips formed by chamfering an end of the first and second press wall liners, the lips being capable of interlocking in a substantially congruent manner.
- In an embodiment of the present invention material forming wear strips and having low static and dynamic coefficients of friction may be a thermoplastic polymer material.
- In an embodiment of the present invention the compressible material may be a rubber bale.
- An embodiment of the present invention can provide a baling apparatus for compressing a compressible material, the baling apparatus comprising:
- a ram assembly, comprising:
- a metallic ram head; and
- a ram head cover mounted on the ram head;
- a plurality of press walls forming a press chamber for receiving the ram head assembly and the compressible material, wherein compression force is provided by movement of the ram head assembly inside the press chamber; and
- a plurality of press wall liners coupled to the press walls and disposed between the press walls and the ram head during periods of compression,
- a first one of the plurality of press wall liners having a. side surface with a first extruding portion of less thickness than the general thickness of the press wall liner, a second one of the plurality of press wall liners having a side surface with a second extruding portion of less thickness than the general thickness of the press wall liner, the first and second extruding portions adapted to tightly engage such that migration of the compressible material between the plurality of press wall liners is retarded,
- wherein the plurality of press wall liners and the ram head cover are comprised of a material having low static and dynamic coefficients of friction.
-
- An embodiment of the present invention can provide a baling apparatus as set out in the foregoing paragraph wherein the ram head has a reduced surface area for receiving the ram head cover, and wherein the ram head cover prevents metal portions of the ram head from contacting the plurality of press wall liners.
- An embodiment of the present invention can provide a baling apparatus as set out in either of the foregoing two paragraphs wherein each of the plurality of press wall liners is integral with one of the plurality of press walls.
- An embodiment of the present invention can provide a baling apparatus as set out in any of the foregoing three paragraphs wherein the first and second extruding portions are lips formed by chamfering an end of the first and second press wall liners, the lips being capable of interlocking in a substantially congruent manner.
- An embodiment of the present invention can provide a baling apparatus for compressing a compressible material, comprising:
- a ram assembly, comprising:
- a metallic ram head; and
- a ram head cover mounted on the ram head;
- the ram head having a reduced surface are for receiving the ram head cover;
- a plurality of press walls forming a press chamber for receiving the ram head assembly and the compressible material, wherein compression force is provided by movement of the ram head assembly inside the press chamber; and
- a plurality of press wall liners coupled to the press walls and disposed between the press walls and the ram head during periods of compression,
- wherein the plurality of press wall liners and the ram head cover are comprised of a material having low static and dynamic coefficients of friction.
-
Claims (21)
- A baling apparatus for compressing a compressible material, the baling apparatus comprising:a ram assembly having a ram head;a plurality of press walls forming a press chamber for receiving the ram head and the compressible material, wherein compression force is provided by movement of the ram head inside the press chamber; andat least one press wall liner coupled to one of the press walls and disposed between the press wall and the ram head during periods of compression, wherein the press wall liner(s) is comprised of a material having low static and dynamic coefficients of friction.
- The baling apparatus of claim 1, wherein the material having low static and dynamic coefficients of friction is a thermoplastic polymer material.
- The baling apparatus of claim 1, wherein the thermoplastic polymer material is Delrin® or Delrin AF®.
- The baling apparatus of claim 1, wherein the at least one press wall liner is integral with a press wall.
- The baling apparatus of claim 1, wherein there are at least two press wall liners, at least one of the press wall liners having a side surface with an extruding portion of less thickness than the general thickness of the press wall liner, the extruding portion adapted to tightly engage a corresponding extrusion of the other press wall liner such that migration of the compressible material between the press wall liners is retarded.
- The baling apparatus of claim 5, wherein the extruding portion of each press wall liner is a lip formed by chamfering an end of each of the press wall liners, the lips being capable of interlocking in a substantially congruent manner.
- The baling apparatus of claim 6, wherein the chamfering is at essentially right angles.
- The baling apparatus of claim 1, further comprising:
wear strips disposed along the outer periphery of the ram head for engaging the press wall liners, the wear strips being comprised of a material having low static and dynamic coefficients of friction. - The baling apparatus of claim 8, wherein the material having low static and dynamic coefficients of friction is a thermoplastic polymer material.
- The baling apparatus of claim 9, wherein the low static coefficient of friction material is Delrin® or Delrin AF®.
- The baling apparatus of claim 1 configured as a rubber baler.
- A baling apparatus for compressing a compressible material, the baling apparatus comprising:a ram assembly, comprising:a ram head; anda ram head cover mounted on the ram head;a plurality of press walls forming a press chamber for receiving the ram head assembly and the compressible material, wherein compression force is provided by movement of the ram head assembly inside the press chamber; andat least one press wall liner coupled to one of the press walls and disposed between the press wall and the ram head cover during periods of compression,wherein the press wall liner(s) and the ram head cover are comprised of a material having low static and dynamic coefficients of friction.
- The baling apparatus of claim 12, wherein the material having low static and dynamic coefficients of friction is a thermoplastic polymer material.
- The baling apparatus of claim 13, wherein the thermoplastic polymer material is Delrin® or Delrin AF®.
- The baling apparatus of claim 12, wherein the ram head is a conventional ram head in which the surface area has been reduced for receiving the ram head cover, and wherein the ram head cover prevents metal portions of the ram head from contacting the press wall liner(s).
- The baling apparatus of claim 12, wherein the ram head cover is coupled to the ram head via bolting means.
- The baling apparatus of claim 12, wherein the at least one press wall liner is integral with a press wall.
- The baling apparatus of claim 12, wherein there are at least two press wall liners, at least one of the press wall liners having a side surface with an extruding portion of less thickness than the general thickness of the press wall liner, the extruding portion adapted to tightly engage a corresponding extrusion of the other press wall liner such that migration of the compressible material between the press wall liners is retarded.
- The baling apparatus of claim 12, wherein the extruding portion of each press wall liner is a lip formed by chamfering an end of each of the press wall liners, the lips being capable of interlocking in a substantially congruent manner.
- The baling apparatus of claim 19, wherein the chamfering is at essentially right angles.
- The baling apparatus of claim 12 configured as a rubber baler.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99101388A EP1023989A1 (en) | 1999-01-26 | 1999-01-26 | Rubber baler with extended service life |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99101388A EP1023989A1 (en) | 1999-01-26 | 1999-01-26 | Rubber baler with extended service life |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1023989A1 true EP1023989A1 (en) | 2000-08-02 |
Family
ID=8237412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99101388A Withdrawn EP1023989A1 (en) | 1999-01-26 | 1999-01-26 | Rubber baler with extended service life |
Country Status (1)
Country | Link |
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EP (1) | EP1023989A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3613568A (en) * | 1969-11-13 | 1971-10-19 | Whirlpool Co | Refuse compactor ram cover |
US3937355A (en) * | 1971-09-27 | 1976-02-10 | Hobart Corporation | Removable liner for trash compactors |
DE2939205A1 (en) * | 1979-09-27 | 1981-04-16 | Augsburger Textilmaschinenfabrik Gmbh, 8904 Friedberg | Baling press for fibrous material - has compression members with friction reducing layer formed by plastics plates secured by screws |
DE2949712A1 (en) * | 1979-12-11 | 1981-06-19 | Norbert 7940 Riedlingen Seidner | Refuse baling press assembly - has ram head and housing made of reinforced concrete |
GB2169846A (en) * | 1984-11-21 | 1986-07-23 | Kumpulan Guthrie Sdn Bhd | Twin chamber press |
US4936206A (en) * | 1988-12-30 | 1990-06-26 | Thomas R. Miles | High-density compactor for fibrous material |
US5461975A (en) * | 1994-06-16 | 1995-10-31 | Driggs; Leland W. | Low friction baler liner |
-
1999
- 1999-01-26 EP EP99101388A patent/EP1023989A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3613568A (en) * | 1969-11-13 | 1971-10-19 | Whirlpool Co | Refuse compactor ram cover |
US3937355A (en) * | 1971-09-27 | 1976-02-10 | Hobart Corporation | Removable liner for trash compactors |
DE2939205A1 (en) * | 1979-09-27 | 1981-04-16 | Augsburger Textilmaschinenfabrik Gmbh, 8904 Friedberg | Baling press for fibrous material - has compression members with friction reducing layer formed by plastics plates secured by screws |
DE2949712A1 (en) * | 1979-12-11 | 1981-06-19 | Norbert 7940 Riedlingen Seidner | Refuse baling press assembly - has ram head and housing made of reinforced concrete |
GB2169846A (en) * | 1984-11-21 | 1986-07-23 | Kumpulan Guthrie Sdn Bhd | Twin chamber press |
US4936206A (en) * | 1988-12-30 | 1990-06-26 | Thomas R. Miles | High-density compactor for fibrous material |
US5461975A (en) * | 1994-06-16 | 1995-10-31 | Driggs; Leland W. | Low friction baler liner |
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