EP0532376A2 - Verfahren zur Herstellung von zylindrischen Rohren aus Holzfurnier und dadurch erhaltenes Produkt - Google Patents

Verfahren zur Herstellung von zylindrischen Rohren aus Holzfurnier und dadurch erhaltenes Produkt Download PDF

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Publication number
EP0532376A2
EP0532376A2 EP92402269A EP92402269A EP0532376A2 EP 0532376 A2 EP0532376 A2 EP 0532376A2 EP 92402269 A EP92402269 A EP 92402269A EP 92402269 A EP92402269 A EP 92402269A EP 0532376 A2 EP0532376 A2 EP 0532376A2
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EP
European Patent Office
Prior art keywords
veneers
cylinder
press
phase
equal
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Application number
EP92402269A
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English (en)
French (fr)
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EP0532376A3 (en
Inventor
Daniel M. Plagne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sa Profilocean
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Sa Profilocean
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Publication date
Application filed by Sa Profilocean filed Critical Sa Profilocean
Publication of EP0532376A2 publication Critical patent/EP0532376A2/de
Publication of EP0532376A3 publication Critical patent/EP0532376A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor

Definitions

  • the present invention relates to a method of manufacturing cylindrical pipes based on wood veneers.
  • a method currently used consists in stacking several veneers glued wire on wire, that is to say with their respective wood wire parallel to that of the others, and so that this direction of the wire is parallel to the axis of the mandrel. central.
  • This double parallelism, on the one hand of the wires between them, on the other hand of the wires with the central axis, is necessary to allow sufficient flexibility for forming.
  • the two heated semi-cylindrical molds are brought together and tighten the two stacking assemblies around the central mandrel: at the start the forming is done cold, before the calories from the molds have hardened the glue, then the hardening takes place while the assembly forms only one cylinder.
  • the two stacking assemblies were made in a size such that the sum of their two widths is equal to or slightly greater than the circumference of the central mandrel.
  • the pointing of the edges parallel to the axis is then done either by simple docking, or by overlap.
  • the cylinder thus obtained after opening the two half-molds and releasing the central mandrel, has a high resistance to bending which makes the fibers parallel to their yarn, that is to say in elongation where the value is maximum, but a low tensile strength which makes the fibers work perpendicular to their yarn, that is to say in tearing where the value is minimal.
  • the cylinders thus produced have poor resistance to internal pressures during use.
  • Document US-A-2 449 526 discloses the manufacture of cylindrical pipes from several veneers with two plies of different wood grain direction which can bend naturally, the thickness of the double ply veneers being such that it allows the additional folding of the veneer using a press to give it the curvature of the cylinder to be manufactured by using several double ply overlapping plies. During this additional bending, the veneers are subjected to stresses which ultimately prove to be detrimental to the compressive and tensile strength of the pipes produced.
  • the invention provides a method of manufacturing cylindrical pipes based on wood veneers which takes advantage of the anisotropy characteristics of wood without creating additional bending constraints.
  • At least one assembly intended to form a multiply with at least three plies, of asymmetrical structure, an outer face of the multiply consisting of a wooden veneer whose direction of the wood fiber wire is parallel to the axis of the cylinder to be formed, the other outer face of the plywood being made of a wooden veneer whose direction of the wood fiber wire is perpendicular to the axis of the cylinder, a pressing is carried out in a flat press of at least this assembly, then the multiply obtained is allowed to deform into a tile at the exit of the press so that it takes a bending of radius substantially equal to the final radius of the cylinder to be manufactured, and the ends of at least this multiply are connected in an assembly press.
  • all the faces of the wooden veneers intended to come into contact with an element used in the composition of the plywood are glued.
  • the bending of the plywood according to the invention is therefore essentially carried out by the phenomenon of natural bending of the asymmetrical plywood, and it does not require additional bending constraints.
  • the product obtained by this process then has very good mechanical properties, in particular very good tensile and compressive strength.
  • the third ply, intermediate can be a glued wooden veneer similar to one of the two external plies of your choice according to the desired bending, knowing that an intermediate ply presenting a fiber thread parallel to the axis of the cylinder, that is to say parallel to the largest dimension of the cladding, will accentuate the bending. On the contrary, the choice of an intermediate fold in the direction of the perpendicular wire will lead to a reduction in bending.
  • the third ply is an intermediate ply which is not a wooden veneer. This fold subsequently designated as a separator promotes the relative sliding of the two outer folds during bending.
  • This separator is made of a material different from wood, it can be a non-woven or needled plastic film such as polyester.
  • the radius of curvature of the natural bending obtained from the asymmetric plies according to the invention depends on different parameters, among which: the thickness of the veneers, the material or quality of the veneer, the number of veneers, the distribution of these veneers according to the orientation of the wood fiber wire in the plywood, knowing that in the plywood used in the context of the invention, the veneers having the same orientation of the wood fiber wire are preferably adjacent to each other.
  • the veneers used as constituent elements of the plywood according to the invention have a thickness of between 0.5 and 3 mm and preferably between 0.5 and 2.5 mm.
  • the length and width of the veneers are directly related to the size of the cylinder to be manufactured as explained below.
  • the width of the plywood is then a fraction equal to the inverse of an integer, that is to say, equal to 1 2 or 1 3 or 1 4 , etc, of the circumference of the cylinder.
  • the number of wood fiber veneers oriented in the direction of the cylinder axis is preferably greater than the number of perpendicular wire veneers.
  • the bending radius obtained naturally depends on different parameters and therefore on the structure (constitution, arrangement, etc.) of the starting assembly.
  • a plywood made up of two rectangular veneers of 2.5 mx 1.25 m with direction of wire perpendicular to each other, 1 to 1.5 mm thick, made of wood soft, separated by a 1 mm separator made of a polyester nonwoven, bends at the exit of the flat press with a final bending radius between 75 and 150 mm approximately, while a multiply made of two veneers adjacent to the wood wire parallel to the length and a perpendicular wood wire veneer separated from the other two by a polyester non-woven separator bends at the outlet of the flat press with a bending radius of about 200 mm , this for softwood veneer thicknesses between 1 to 1.5 mm approximately.
  • the natural tendency to bend asymmetric plywood according to the invention is accentuated according to whether, in the stacking of veneers considered, the thickness or the density of the essence of one or more of them is modified in one direction or in the other.
  • any synthetic film such as for example a paper impregnated with formo-phenolic resin can be added to the composition of the stack either on the side intended to become the concavity of the tile, or on the other where it will constitute a tight and hard skin by having participated, if the direction of its own constituent fiber has been well implemented, in the desired deformation in tile.
  • This sheet is not considered to be a fold according to the invention.
  • This assembly press consists of a simple heated inner mandrel which need not be cylindrical but perhaps only flat with two reactive ends and an outer heated mandrel whose necessary and sufficient condition to be effective is 'be a circular arc of diameter equal to that of the cylinder to be manufactured: this outer mandrel will be accompanied by a possibly heating block of equal curvature placed symmetrically at the diametrically opposite end of the press.
  • a cylinder is thus obtained which has the advantage, while having sufficient flexural strength thanks to the plating (s) whose wire direction is parallel to the main axis, of having a high tensile strength thanks to the (X) cladding (s) whose direction of the wire perpendicular to the axis of the cylinder is such that an internal pressure will make the fiber work in elongation, that is to say with maximum resistance values.
  • the heating wedge placed on the side diametrically opposite to the first external mandrel not for bonding a balancing, but for associating between them two asymmetric plies deformed in tiles.
  • This has the advantage, when one is limited in width of flat press, to be able to manufacture cylinders of larger diameter. For example, if the flat press has a width of 1500 mm, it is only possible to produce cylinders whose maximum diameter is equal to 1500 mm / 3.1416, therefore a little less than 50 centimeters; on the other hand, if we can associate two plies, we can realize in this case cylinders with a maximum diameter of 2 x 1500 3.1416 , about 1 meter.
  • glued wood veneers 1 whose direction of the grain of the wood is parallel to their largest dimension in the plane are associated with a smaller number of glued veneers 2 whose direction of the grain is perpendicular to that of the previous two.
  • a separator 9 1 mm thick in a polyester nonwoven is placed between the veneers 1 and the veneers 2, for example the product sold under the name BIDIM by the company Rhône-Poulenc.
  • This separator allows better relative sliding of the veneers 1 vis-à-vis the veneers 2 and therefore facilitates subsequent natural bending.
  • the whole is placed in a hot flat press, at a sufficient pressure and the time necessary for the resins to be well polymerized.
  • the flat press is opened, the plane parallelepiped obtained is taken out and placed in the ambient atmosphere.
  • the variations in temperature and humidity, and, in general, the release of internal stresses consecutive to the asymmetry of its constitution and to the large difference in tendency to dimensional variations thus caused between the two axes of its plane cause the natural deformation of the parallelepiped into a tile 4 here in the shape of a semicircle.
  • the deformation of the multiply can go as far as forming a complete circle, this deformation being more pronounced if the thicknesses and / or densities of some of the veneers 1 are greater than those of the veneers 2.
  • One or more glued plating (s) or a glued shaped piece 6, possibly lined with impregnated paper identical to the previous one, are placed along the mandrel 5, preferably with the direction of its fibers perpendicular to the axis of the cylinder.
  • a wedge 7 of equal curvature is located symmetrically, that is to say at the diametrically opposite end of the press.
  • An internal mandrel 8 of dimension at most equal to the value of the desired final diameter, is designed in such a way that it can react to the pressures of the external mandrels 5 and 7.
  • a second identical assembly 9 is placed at the start of the operations and in a position diametrically opposite to the assembly 6.
  • a cylinder with a length of 2500 mm, a diameter of 400 mm and a wall thickness of 3.3 is manufactured.
  • mm with laminated phenolic interior surface is produced in a flat press having plates of a little more than 2500 mm long by 1300 mm wide.
  • the veneers are 1.15 mm thick each, 2500 mm long and 1256 mm wide and a sheet of phenolic impregnated paper 3 with a grammage per m2 adapted to the need and dimensions in the plane of 2500 mm and 1256 mm.
  • the cylinder will be produced in the special press by means of a mandrel 5 with a radius of curvature equal to 200 mm using a pointing assembly 6 of 2500 mm long having a suitable thickness and width. if necessary, associated with a sheet of impregnated paper of the same dimensions in the plan.
  • An assembly 9 identical to assembly 6 will preferably be used.
  • a cylinder with a length of 3100 mm, a diameter of 900 mm and a wall thickness of 5.3 mm with a laminated phenophenic outer surface is produced.
  • two asymmetrical 5 + 1 ply asymmetric plywood panels with two veneers 2 and three veneers 1 of 1.15 mm are produced in the flat press having plates of just over 3100 mm long and 1300 mm wide. each thick and 3100 mm long and 1413 mm wide, separated by a separator made of non-woven polyester. These two plies will then be assembled in the special press using assemblies 6 and 9 of suitable pointing.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
EP19920402269 1991-08-13 1992-08-12 Process for the manufacture of cylindrical pipes from wood veneer and product thereof Withdrawn EP0532376A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9110264 1991-08-13
FR9110264A FR2680334B1 (fr) 1991-08-13 1991-08-13 Procede de fabrication de tuyaux cylindriques a base de placages de bois, et produit en resultant.

Publications (2)

Publication Number Publication Date
EP0532376A2 true EP0532376A2 (de) 1993-03-17
EP0532376A3 EP0532376A3 (en) 1993-10-13

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EP19920402269 Withdrawn EP0532376A3 (en) 1991-08-13 1992-08-12 Process for the manufacture of cylindrical pipes from wood veneer and product thereof

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EP (1) EP0532376A3 (de)
FR (1) FR2680334B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102284980A (zh) * 2011-09-13 2011-12-21 刘航远 圆形胶合板的制作方法
CN108138508A (zh) * 2015-09-07 2018-06-08 帕斯科技术公司 杆
WO2020149784A1 (en) 2019-01-16 2020-07-23 Modvion Ab Laminated wood tower and method for assembly of a laminated wood tower
CN113874589A (zh) * 2019-05-09 2021-12-31 莫德维翁公司 木材连接件和包括多个这样的木材连接件的层压的木材塔
SE2051271A1 (en) * 2020-11-02 2022-04-26 Modvion Ab Method for producing a laminated veneer lumber board

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPR20100025A1 (it) * 2010-04-13 2011-10-14 Lamm Spa Tubolare in legno sfibrato, procedimento per realizzare detto tubolare esedia in legno impiegante detto tubolare
CN104942905A (zh) * 2015-06-12 2015-09-30 柳州市骏马木业有限公司 一种环保型高性能桉木胶合板的制作方法
CN104960042A (zh) * 2015-06-12 2015-10-07 柳州市骏马木业有限公司 一种高性能环保型桉木胶合板的生产方法
CN105171853A (zh) * 2015-06-12 2015-12-23 柳州市骏马木业有限公司 一种环保型高性能桉木胶合板的生产方法
CN104924373A (zh) * 2015-06-12 2015-09-23 柳州市骏马木业有限公司 一种环保型高性能桉木胶合板的制备方法
CN104942906A (zh) * 2015-06-12 2015-09-30 柳州市骏马木业有限公司 一种环保型高性能桉木胶合板的加工方法
CN104942909A (zh) * 2015-06-12 2015-09-30 柳州市骏马木业有限公司 一种环保型高性能桉木胶合板的制造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE95451C (de) * 1895-12-05 1898-01-05 Verfahren zur Herstellung von Fafsmänteln aus Holzfournieren
BE452758A (de) * 1900-01-01
US2043026A (en) * 1934-10-04 1936-06-02 Seymour & Peck Co Barrel
US2407711A (en) * 1943-05-20 1946-09-17 Brunswick Balke Collender Co Method of building and forming plywood parts
US2449526A (en) * 1943-05-03 1948-09-14 Us Plywood Corp Process for manufacturing plywood tubing
FR1008050A (fr) * 1950-01-06 1952-05-13 Presse pour la fabrication de tubes en bois
DE1007445B (de) * 1952-11-21 1957-05-02 Hausmann Blomberger Holz Verfahren zur Herstellung von elektrischen Heizbuegeln aus Sperrholzheizplatten
FR1220863A (fr) * 1957-12-30 1960-05-30 Hausmann Blomberger Holz Conduit d'aération et de ventilation constitué par plusieurs feuilles de placage ou de contreplaqué collées ensemble, utilisable dans les mines pour les cheminées d'aération et de ventilation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE452758A (de) * 1900-01-01
DE95451C (de) * 1895-12-05 1898-01-05 Verfahren zur Herstellung von Fafsmänteln aus Holzfournieren
US2043026A (en) * 1934-10-04 1936-06-02 Seymour & Peck Co Barrel
US2449526A (en) * 1943-05-03 1948-09-14 Us Plywood Corp Process for manufacturing plywood tubing
US2407711A (en) * 1943-05-20 1946-09-17 Brunswick Balke Collender Co Method of building and forming plywood parts
FR1008050A (fr) * 1950-01-06 1952-05-13 Presse pour la fabrication de tubes en bois
DE1007445B (de) * 1952-11-21 1957-05-02 Hausmann Blomberger Holz Verfahren zur Herstellung von elektrischen Heizbuegeln aus Sperrholzheizplatten
FR1220863A (fr) * 1957-12-30 1960-05-30 Hausmann Blomberger Holz Conduit d'aération et de ventilation constitué par plusieurs feuilles de placage ou de contreplaqué collées ensemble, utilisable dans les mines pour les cheminées d'aération et de ventilation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102284980A (zh) * 2011-09-13 2011-12-21 刘航远 圆形胶合板的制作方法
CN108138508A (zh) * 2015-09-07 2018-06-08 帕斯科技术公司 杆
EP3347550A4 (de) * 2015-09-07 2019-05-01 Pålskog Teknik AB Mast zum stützen eines kabels und verfahren zur herstellung des masten
US10576655B2 (en) * 2015-09-07 2020-03-03 Pålskog Teknik Ab Pole and method of manufacturing the pole
US11052566B2 (en) 2015-09-07 2021-07-06 Pålskog Teknik Ab Pole and method of manufacturing the pole
WO2020149784A1 (en) 2019-01-16 2020-07-23 Modvion Ab Laminated wood tower and method for assembly of a laminated wood tower
US12006713B2 (en) 2019-01-16 2024-06-11 Modvion Ab Laminated wood tower and method for assembly of a laminated wood tower
CN113874589A (zh) * 2019-05-09 2021-12-31 莫德维翁公司 木材连接件和包括多个这样的木材连接件的层压的木材塔
SE2051271A1 (en) * 2020-11-02 2022-04-26 Modvion Ab Method for producing a laminated veneer lumber board
SE544370C2 (en) * 2020-11-02 2022-04-26 Modvion Ab Method for producing a laminated veneer lumber board
WO2022093103A1 (en) * 2020-11-02 2022-05-05 Modvion Ab Method for producing a laminated veneer lumber board

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Publication number Publication date
FR2680334A1 (fr) 1993-02-19
EP0532376A3 (en) 1993-10-13
FR2680334B1 (fr) 1995-10-27

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