US2827935A - Method for treating wood surfaces - Google Patents

Method for treating wood surfaces Download PDF

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Publication number
US2827935A
US2827935A US615127A US61512756A US2827935A US 2827935 A US2827935 A US 2827935A US 615127 A US615127 A US 615127A US 61512756 A US61512756 A US 61512756A US 2827935 A US2827935 A US 2827935A
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United States
Prior art keywords
wood
rubbing
pressure
heat
contact
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Expired - Lifetime
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US615127A
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English (en)
Inventor
George E Alexander
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General Plywood Corp
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General Plywood Corp
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Application filed by General Plywood Corp filed Critical General Plywood Corp
Priority to US615127A priority Critical patent/US2827935A/en
Priority to FR1172402D priority patent/FR1172402A/fr
Priority to FR747995A priority patent/FR73025E/fr
Priority to NL221096A priority patent/NL221096A/nl
Priority to GB40295/57A priority patent/GB861347A/en
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Publication of US2827935A publication Critical patent/US2827935A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/003—Mechanical surface treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents

Definitions

  • the principal object of this invention is to provide a novel wood surface treating process which can be simply and inexpensively carried out and which results in the substantial improvement of that surface in one or more respects such as increased hardness, smoothness and reflectivity and reduced porosity and absorbency.
  • Another important object is to provide a wood glossifying process which can be performed at high speed on a straight through production line conveyor.
  • Another important object of this invention is to provide a novel and inexpensive frictional method for changing the structure of the wood along the surface without changing the underlying structure and, through such change, to effect a substantial increase in surface smoothness and a substantial decrease in its ability to absorb finishing or other materials.
  • Another object of this invention is to provide a new and novel process for producing a wood product having its surface wood structure of relatively greater density and finer texture than the density and texture of the underlying natural wood structure.
  • the objects of my invention may be achieved by frictionally heating the surface of the wood sufliciently'to soften the wood along that surface without softening it throughout its depth and by compressing the wood while the surface wood is softened so as to density the surface wood without appreciably densifying the wood throughout its depth.
  • the surface should be frictionally heated to a temperature high enough to soften the surface wood (by softening the plastic binder of the surface wood) and it may be heated to a temperature sufiicient to char the surface wood provided the charring temperature is reduced below the lower char limit before charring begins.
  • the chemistry of wood is very complex, difiicult to understand and not too well understood. However, it is known to contain interdispersed heat plasticizable materials and its content of these materials is believed to be largely embraced by the term lignin. The process is carried out on seasoned and dried wood without artificial moistening.
  • the drawing discloses one type of apparatus for practicing the process of this invention.
  • This apparatus includes a pair of horizontally spaced and aligned conveyor sections or portions 1 and 2, each of which contains a plurality of freely rotatable rollers 3.
  • the upper surface of the rollers 3 project slightly above the surface of the conveyor frame to support a piece of plywood or planar wood products such as a fiush door or wall panel 4.
  • the wall panel 4 is freely movable on the rollers 3.
  • the adjacent spaced ends of conveyor portions 1, 2 are mounted on correspondingly spaced brackets 5, 6 which are secured by any suitable means, such as welding, to upstanding supporting members 7, 8 of inverted L-shape.
  • the supporting members 7, S are also provided with upwardly turned lip portions 7a, 8a, respectively, which are spaced from each other to define an opening 9 between them.
  • the opening 9 is arranged to receive an arcuate portion of a cylindrical member or drum 10 fixedly mounted on driving shaft 11, which is driven by any suitable driving means such as a motor (not shown).
  • This drum 10 is preferably approximately 16 inches in diameter but may be of any diameter desired according to the size of the apparatus in the drawing, and is preferably covered with one or more cylindrical layers or sleeves 10a, composed of rubber or other suitable yieldable material so that the roll can compel the belt to conform to uneven or itregular surfaces in a manner known in this art. If rubber is used it may be vulcanized to the surface of the drum 10.
  • the arcuate portion of the drum 10 which extends through the opening 9 is so positioned that it tangentially engages the undersurface of the panel 4, when it is positioned on the conveyor rollers 3.
  • a continuous or endless surface treating belt 12 preferably composed of cork or containing a cork surface, is arranged around the peripheries of 3 the rotating drum 10, which functions as a backing member for belt 12, and an idler drum 13, which is fixedly mounted for rotating movement on a shaft 14 supported in any suitable manner.
  • the drums 10, 13 are rotated by drive shaft 11 in the counterclockwise direction indicated by arrows D and I, the idler drum 13 being used to maintain the desired tension in the surface treating belt 12.
  • I preferably employ a surface treating belt of the type having a cork surface, e. g., as exemplified by the belts presently made under U. S. Patent No. 2,542,058, except that the very mild abrasive sometimes employed in such cork belts is unnecessary and may be omitted.
  • Any other flexible, yielding, relatively nonabrasive frictional rubbing medium or frictional belt material, such as canvas, or other cloth made of natural or synthetic fibers, may be employed so long as it is capable of frictionally developing the requisite temperature when the requisite operating conditions are employed, and of withstanding both the operating temperatures and pressures.
  • these belts provide a flexible, frictional, relatively nonabrasive buffing or rubbing and somewhat yielding surface composed of nonmetallic material. Since this material, in comparison with metal, is a relatively poor conductor of heat or a good heat insulator, it may be aptly described as a heat insulating material.
  • my process does not make a rough surface smooth, nor does it involve the abrasive cutting or removal of any material.
  • a surface is rough sanded, and then heated and densified in accordance with my invention, it will still remain a rough surface even though there has been some improvement in smoothness. But this rough sanded surface will nevertheless have the superior finishing properties which characterize surfaces treated in accordance with my invention.
  • the process should be applied to wood surfaces which have been finish sanded.
  • the panel 4 is rapidly moved from left to right, along the predetermined path provided by the conveyor. This movement is effected by a feed roll 15, which is arranged above and in contact with the upper surface of the panel.
  • the feed roll 15 is preferably conventionally covered with a spirally grooved or ungrooved cylinder of rubber to increase traction and is driven in the direction of the arrow F by means of a shaft 16 on which roll 15 is fixedly mounted.
  • the shaft 16 is supported on any suitable type of resilient bearing pedestal (not shown) which permits a limited amount of vertical movement so that the feed roll 15 will exert a downward pressure on the work in the direction of the arrow P.
  • the weight of the roll itself may be augmented if desired by auxiliary weights, springs or other means for exerting the required downward pressure, which should be substantial.
  • the shaft is preferably driven by means of a belt 17 which is arranged around the shaft 16 in such a manner as to pull downwardly on the shaft 16 as it is being driven.
  • a panel 4 is fed into the space between drums and 15.
  • the substantial pressure of the feed roll against the panel forces the undersurface of that panel downwardly against the treating belt 12 as the panel passes therebetween.
  • the panel is fed or propelled by the feed roll at a linear speed approximating the peripheral speed of the feed roll, there being relatively little or no slippage therebetween.
  • the drum 10 drives the surface treating belt in a direction opposite to that of the panel and at a substantially higher speed. Under these conditions, a high temperature is momentarily produced on the surface of the panel along the line or band of contact between the belt and the panel. This temperature should be high enough to soften the surface wood momentarily, and more or less instantaneously, without softening the underlying wood structure of the panel.
  • a very mild abrasive or lubricating material in dry powdered form may be employed in conjunction with the process with some improvement in the surface sheen.
  • the process is essentially a nonabrasive process, as is clear from the fact that even a very light pencil mark made on a piece of wood before treatment is not removed therefrom during the surface treatment.
  • a wood surface may be pressure smoothed and densified by a heated platen having a surface which is pressed against the surface of the wood.
  • a platen heated to a temperature of 475 F. to 500 F. and pressed against the wood surface for one second at 200 p. s. i. gives good results.
  • the pressure should be p. s. i. or more, and the quality of the finished surface improves up to a pressure of 300 p. s. i. or more.
  • the only upper limit on the pressure is that irrlposed by the crushing strength of the unheated body of the wood, which must not be reached.
  • the pressure was insufiicient to produce the desired degree of surface densification at the temperature used although, due to the long exposure, the wood was heated and softened to a greater depth and consequently the total permanent compression (i. e., reduction in thickness due to treatment of one surface) was higher than that of specimen 3.
  • the platen temperatures given above will necessarily be higher than the temperature reached by the wood due to the necessity of transferring heat by conduction from the platen to the wood.
  • the apparatus of the drawing Since the desired results are achieved when the temperatures developed are high and only surface wood is heated it is desirable to complete the treatment with the apparatus of the drawing within a time period of no more than /5 of a second, and preferably within a period not exceeding of a second.
  • the period of treatment is determined by the width of the wood surface contacted under pressure by the friction member and the rate of feed of the work. With a 16-inch rubber covered drum it is estimated that the width of the band of contact is no more than A when the pressure applied by feed roller 21 is 7 /2 pounds per lineal inch of roller length.
  • the temperature developed during the treatment for any given rate of work feed and width of pressure contact depends on the pressure and the belt speed, increasing as either or both of these factors increase and vice versa. The best results are achieved when the temperature developed closely approaches the scorching temperature for the treatment time employed. The process cannot be applied to green wood or to wet wood since the evaporation of moisture absorbs the heat and prevents the wood surface from attaining the requisite temperature.
  • the maximum pressure exerted may be varied widely, it must be suflicient to produce the above specified degree of densification within the time indicated.
  • the actual maximum pressure exerted by the apparatus of the drawing is difficult to determine since it varies over the narrow band of contact from zero at the edges of the band to a maximum at the center.
  • relatively high maximum pressures are deas a'noas veloped and are necessary to obtain a useful densification of the wood surface in the very short treatment times employed.
  • excellent results have been obtained when the diameter of drum 10 is 16 inches and the downward pressure exerted by roller 15 ranges from 7 /2 pounds to 15 pounds per lineal inch of contact be tween the belt and the wood surface along the length of the roller. Under proper conditions of belt speed and work feed the pressures may be greater or less than that range.
  • the contact time is of a second or less for a contact band of one inch or less and the temperature closely approaches the scorching temperature which is believed to be in the neighborhood of 620 F. for that treatment time. This is indicated by the fact that under the conditions stated a very slight indication of scorching is noted at rare intervals. This can be avoided, if desired, and excellent results achieved by increasing the feed rate to 125 feet per minute.
  • the maximum pressure may have to be increased by increasing the force exerted by roller in order to obtain the desired degree of permanent compression and if this results in objectionable scorching the work feed will have to be increased to reduce the treatment time or the belt speed reduced to reduce the temperature developed. If any one of the other conditions is changed from the values stated in the above table, its effect, if deleterious may be compensated for by modifying one or more other conditions in accordance with the principles outlined above to produce the desired permanent compression within the stated time limits without objectionable scorching.
  • the panel may be frictionally heated by other means such as, for example, a cylindrical cotton bufiing wheel having an axial length equal to or exceeding the width of the surface to be treated.
  • the rubbing surface moves through a concavo-convex path with its convex side intimately and firmly pressed by a backing memberinto flat-faced rubbing contact with the fiat product surface to maintain in the rubbing zone a transversely-extending band of rubbing contact.
  • Prior burnishing operations The process should be distinguished from known wood burnishing operations which involve frictionally heating wood with cloth. Prior burnishing operations have not been applied to fiat wood surfaces of any substantial area, and the techniques employed are incapable of giving a uniform treatment over a large flat area.
  • my process can be performed to provide a surface which does not require the use of sealing or filling materials and which may, without using a sealer or a filler, be finished to produce .a surface far superior in quality to that heretofore obtainable on a commercially sanded surface with either or both sealer or filler.
  • the process is applied to Douglas fir plywood, the results are startling in that it substantially eliminates the very troublesome tendency of either or both the spring and summer grain and surface fibers of Douglas fir to raise after painting or other surface coating, and it also reduces the tendency of the wood to check.
  • the process of treating a relatively smooth Wood surface comprising: frictionally heating and compressing the Wood surface by a relatively nonabrasive heat-insulating friction member which, while a backing member presses it into contact with the wood surface, rubs it at one speed and relatively traverses it at a lower speed such that it does not remain in contact with any given portion of the wood surface for more than one-fifth of a second, the rubbing speed and the pressure and time of contact between the friction member and the wood surface being correlated to heat the surface to a temperature which will soften the heat plasticizable material in the wood and cause a permanent compression of the surface of the wood ranging from .0005" to .0050 during the period of contact.
  • the process of treating a relatively smooth wood surface comprising: frictionally heating and compressing the Wood surface by a relatively nonabrasive heat-insulating friction member which, while pressed against the wood surface, rubs it at a high speed and traverses it at a relatively low speed such that it does not remain in contact with any given portion of the wood surface for more than one-eighteenth of a second, the rubbing speed and the pressure, and time of contact between the friction member and the wood surface being correlated to heat the surface to a temperature which will soften the heat plasticizable material in the wood and cause a permanent compression of the surface of the wood ranging from .0005 to .0025 during the period of contact.
  • a method of treating the surfaces of wood and other firm cellulosic materials, which are coherent enough to resist destructive Wear under rubbing pressures comprising: providing a product presenting a relatively smooth regular porous firm cellulosic surface containing interdispersed heat plasticizable material having the properties of being heat plasticizable at temperatures elevated substantially above room temperatures and of being in a hardened state at room temperatures after it has been heat plasticized; and rubbing said cellulosic surface with a relatively fast moving rubbing medium having a flexible relatively nonabrasive frictional heat insulating rubbing surface which is intimately and firmly pressed by a backing member against said cellulosic surface while traversing it at a controlled speed providing momentary rubbing contact at successive areas of said cellulosic surface; the magnitudes of the rubbing pressure against the cellulosic surface and the rubbing speed relatively to the cellulosic surface being correlatively controlled to cause said medium, during its momentary time of contact with a given area of said cellulosic surface not
  • a method of treating wood comprising: providing a product having a wood member presenting a relatively smooth regular porous wood surface containing interdispersed heat plasticizable material having the properties of being heat plasticizable at temperatures elevated substantially above room temperatures and of being in a hardened state at room temperatures after it has been heat-plasticized; rubbing said wood surface with a relatively fast moving rubbing medium having a flexible relatively non-abrasive frictional heat insulating rubbing surface which is intimately and firmly pressed by a backing member against said wood surface while traversing it; controlling the magnitude of the traversing speed at which the rubbing medium traverses said surface to provide rubbing contact of predetermined momentary order at successive areas of said wood surface; and correlatively controlling the magnitudes of the rubbing pressure against the surface and the rubbing speed relatively to the surface to cause said medium, during its momentary time of contact with a given area of said wood surface, not only to generate frictional heat on said wood surface at the elevated temperature level required for heat plasticizing the said heat-plasticizable material inter
  • a method of treating wood comprising: providing a product having a relatively smooth and fiat porous wood surface; moving that product edgewise relatively along a predetermined path extending longitudinally through a transverse work plane; moving an endless flexible rubbing medium, having a yielding relatively nonabrasive frictional heat insulating rubbing surface, at a relatively high rubbing speed toward and away from said surface at and along said transverse work plane; pressing said rubbing medium with a backing member into firm intimate frictional engagement with said wood surface to maintain a transversely extending band of rubbing contact therewith at and along said work plane; controlling the magnitude of the relative product speed through said work plane at a value providing momentary rubbing contact time of the order of a fraction of a second for each inch of contact band width; and correlatively controlling the magnitudes of the rubbing pressure against said surface and the rubbing speed relatively to the surface at values causing said medium, during its momentary time of contact with a given area of said wood surface, not only to generate frictional heat on said surface at the elevated temperature level required
  • the second mentioned controlling step is performed with the magnitudes of said rubbing pressure and rubbing speed controlled to produce plasticizing, smoothing and densifying without charring said surface wood.
  • the second mentioned controlling step is performed with the magnitudes of said rubbing pressure and rubbing speed controlled to produce said plasticizing, smoothing and densifying without scorching said surface wood.
  • the method of providing a substantially flat wood surface with a glossy and relatively non-porous finish comprising: nonabrasively bufling the surface with a buffing medium having a flexible yielding relatively nonabrasive frictional heat insulating rubbing surface moving at a predetermined bufiing speed, compressing the buffing medium between a backing member and said wood surface to press the bufiing medium into intimate and firm contact with said surface; and correlatively controlling the buffing speed, pressure and time to compress, pressure smooth and densify the surface wood without scorching the wood.
  • a method of finishing wood panels, flush doors and other fiat-faced products presenting a smooth porous firm heat-insulating flat surface, containing plasticizable material having the properties of being plasticizable at temperatures elevated substantially above room temperatures and of being in a hardened state at room temperatures after it has been heat plasticized comprising: moving such a product progressively through a rubbing zone; rubbing said product surface in said zone with a fast moving flexible yielding unabrasive heat-insulating rubbing surface, which moves toward and away from said product surface through a concavo-convex path with its convex side intimately and firmly pressed by a backing member into frictional rubbing contact with said product surface to maintain in said zone a transversely-extending band of rubbing contact; controlling the magnitude of the product speed to provide a rubbing contact time of the order of a fraction of a second for each inch of contact band width; and correlatively controlling the magnitude of the rubbing pressure against, and the rubbing speed relatively to, said product surface at values causing said

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
US615127A 1956-10-10 1956-10-10 Method for treating wood surfaces Expired - Lifetime US2827935A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US615127A US2827935A (en) 1956-10-10 1956-10-10 Method for treating wood surfaces
FR1172402D FR1172402A (fr) 1956-10-10 1957-02-19 Procédé et appareil pour traiter les surfaces en bois
FR747995A FR73025E (fr) 1956-10-10 1957-09-24 Procédé et appareil pour traiter les surfaces en bois
NL221096A NL221096A (fr) 1956-10-10 1957-09-25
GB40295/57A GB861347A (en) 1956-10-10 1957-12-30 Method of treating the surface of wood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US615127A US2827935A (en) 1956-10-10 1956-10-10 Method for treating wood surfaces

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Publication Number Publication Date
US2827935A true US2827935A (en) 1958-03-25

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ID=8704838

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Application Number Title Priority Date Filing Date
US615127A Expired - Lifetime US2827935A (en) 1956-10-10 1956-10-10 Method for treating wood surfaces

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US (1) US2827935A (fr)
FR (2) FR1172402A (fr)
GB (1) GB861347A (fr)
NL (1) NL221096A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160543A (en) * 1961-06-07 1964-12-08 Elmendorf Armin High speed veneering
US4554959A (en) * 1981-07-10 1985-11-26 Ry Ab, Fack Surface treatment of sheet material
FR2673563A1 (fr) * 1991-03-08 1992-09-11 Skid Sa Appareil a poncer les skis.
CN113414082A (zh) * 2021-05-07 2021-09-21 龚海军 一种木材表面高阻隔性纳米涂布层制备工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996005034A1 (fr) * 1994-08-15 1996-02-22 Weyerhaeuser Company Placages de bois et produits derives a resistance et rigidite ameliorees
CN101603623B (zh) * 2009-05-29 2013-09-11 浙江世友木业有限公司 一种表面强化实木型材的制造方法
CN102166770B (zh) * 2011-01-27 2016-01-27 宁波市镇海捷登工艺楼梯厂 一种木条的加工设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118763A (en) * 1936-12-24 1938-05-24 Masonite Corp Burnishing of fiberboards
US2412523A (en) * 1944-11-28 1946-12-10 Lundstrom Carl Brynolf Method of producing wooden articles of circular cross section and varying diameter, and the resulting article
US2488301A (en) * 1944-04-17 1949-11-15 Lundstrom Carl Brynolf Furniture component with hardened exposed surfaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118763A (en) * 1936-12-24 1938-05-24 Masonite Corp Burnishing of fiberboards
US2488301A (en) * 1944-04-17 1949-11-15 Lundstrom Carl Brynolf Furniture component with hardened exposed surfaces
US2412523A (en) * 1944-11-28 1946-12-10 Lundstrom Carl Brynolf Method of producing wooden articles of circular cross section and varying diameter, and the resulting article

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160543A (en) * 1961-06-07 1964-12-08 Elmendorf Armin High speed veneering
US4554959A (en) * 1981-07-10 1985-11-26 Ry Ab, Fack Surface treatment of sheet material
FR2673563A1 (fr) * 1991-03-08 1992-09-11 Skid Sa Appareil a poncer les skis.
EP0504073A1 (fr) * 1991-03-08 1992-09-16 SKID Société Anonyme Appareil à poncer les skis
US5203118A (en) * 1991-03-08 1993-04-20 Skid, Societe Anonyme Ski grinding machine
CN113414082A (zh) * 2021-05-07 2021-09-21 龚海军 一种木材表面高阻隔性纳米涂布层制备工艺

Also Published As

Publication number Publication date
FR73025E (fr) 1960-09-22
FR1172402A (fr) 1959-02-10
GB861347A (en) 1961-02-15
NL221096A (fr) 1964-11-10

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