EP0191276A1 - Holzvorbereitungsverfahren zum Imprägnieren - Google Patents

Holzvorbereitungsverfahren zum Imprägnieren Download PDF

Info

Publication number
EP0191276A1
EP0191276A1 EP85870022A EP85870022A EP0191276A1 EP 0191276 A1 EP0191276 A1 EP 0191276A1 EP 85870022 A EP85870022 A EP 85870022A EP 85870022 A EP85870022 A EP 85870022A EP 0191276 A1 EP0191276 A1 EP 0191276A1
Authority
EP
European Patent Office
Prior art keywords
perforations
wood
faces
fibers
spacing
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Withdrawn
Application number
EP85870022A
Other languages
English (en)
French (fr)
Inventor
Charles Henri De Moor
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.)
Hamon Sobelco SA
Original Assignee
Hamon Sobelco SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hamon Sobelco SA filed Critical Hamon Sobelco SA
Priority to EP85870022A priority Critical patent/EP0191276A1/de
Publication of EP0191276A1 publication Critical patent/EP0191276A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • B27M1/006—Mechanical surface treatment for preparation of impregnation by deep incising

Definitions

  • the invention relates to the protective treatment of wood, in particular for industrial cooling towers (also called atmospheric refrigerants).
  • the invention relates more particularly to a process for preparing wood for its impregnation to the core.
  • the process of the invention is prior to the impregnation of the wood and is independent of the technique and of the impregnation product which will be used.
  • the penetration is negligible because it takes place in the direction of the length (of the order of one to several meters) of the pieces of wood, essentially along the axis of the trunks of trees.
  • wood is subjected to the action of water to be cooled, often charged with various chemical substances, to that of atmospheric air, carrying innumerable biological germs (algae, mushroom gnons, (fungi), ...), and to strong variations in temperature and humidity, especially between the stops and the steps of the atmospheric refrigerant.
  • the pieces of wood used in industrial constructions, and in particular in atmospheric refrigerants, are obviously treated by impregnation before assembly, all the various cuts and perforations, in particular for the passage of bolts, having however been carried out before the impregnation treatment.
  • the manipulation of pieces of wood, their assembly, their assembly in industrial constructions constitute numerous occasions to injure the wood; if the impregnation is very shallow, the slightest injury is a primer to the subsequent attack of the wood by aggressive biological and chemical agents which easily reach the non-impregnated part.
  • the slightest defect in a thin impregnation layer also makes it locally porous and therefore conducive to the penetration of destructive agents.
  • a thin layer is also easily pierced mechanically, both by the accidental action of man and by the action of animals and various parasites. It is therefore important to seek to improve the penetration of impregnation products.
  • the penetration depth has thus been multiplied by 5 or even 10, this remains however small; it is very far from a penetration to the core of the impregnation products, this penetration being always very low in the direction perpendicular to the fibers ("grains" in English).
  • the fibers are not strictly coaxial with the trunk (theoretically vertical for a straight upright tree); they have inclinations relative to the axis of the trunk, or more exactly by relation to the direction of movement of the logs ("log" in English) in the incising machine, on the order of 10% on average, random, on either side of the axis; the length of the notches will therefore affect a quantity of fibers which is all the greater as the notches are, on the one hand, longer and on the other hand, closer to one another in the direction of the length.
  • notches are relatively long (0.4 inch or 10 mm typically) and the longitudinal pitch is relatively small (0.4 inch or 10 mm between two successive notches offset tangentially by 0.2 inch, or 5.0 mm; 3 inches or 75 mm, between two aligned notches).
  • the reduction in mechanical properties will be greater the smaller the diameter of the log, and will be particularly sensitive in bending for example, because it is essentially the outer layers which provide resistance to bending.
  • resistance of wooden constructions, particularly atmospheric refrigerants it will be necessary to admit significant reductions in the maximum admissible tensions, of the order of 20 to 25%.
  • the diameters of the perforations are preferably 2 to 3 mm; they may however be between 1 and 5 mm depending on the case (nature of the wood, length of the perforation, nature of the subsequent impregnation, method of perforation).
  • the holes are always drilled perpendicular to the fibers; but in any plane perpendicular to the fibers, the perforations are oriented either perpendicular to the ring rings, or tangentially to the ring rings, or at any angle with respect to the ring rings.
  • the perforations are substantially perpendicular to the rings; this is the case for round pieces whose axis is substantially that of the tree (logs, posts, piles).
  • the parts are preferably perforated on the faces which give the shortest perforation lengths.
  • these square and rectangular section pieces can be perforated on faces perpendicular to each other.
  • the pieces of any section are preferably perforated on their flat faces and are perforated perpendicular to these faces.
  • the perforations on one side are offset from each other both in the direction of the fibers and in the perpendicular direction.
  • the impregnation product will fill the holes resulting from the perforations and will diffuse in the wood especially along the fibers, from a few cm to a few tens of cm as indicated above; in the other directions the penetration will be weaker.
  • the spacing of the holes is different in the direction of the fibers and in the direction perpendicular to the fibers. It is preferably larger in the direction of the fibers than in the perpendicular direction fiber laire.
  • the perforations can be done by any known process, in particular by drilling using drill bits or forests. But it can also be done in a new way by hollow needles, the central channel of the needle ensuring the evacuation of the wood.
  • the central recess of the needles seems essential; in fact, a solid needle would crush the wood over its entire length and create tensions which could crack the wood and create breaking points.
  • Such hollow needles have a length at least equal to that of the hole to be made, for example 35 mm, and have a diameter, for example, outside of 3 mm, and inside of 1.8 mm, the thickness of the walls of the needle being 0.6 mm; these needles would be, for example, special hardened tool steel; the perforation would be by depression, either continuous or jerky; a correct draft of the tip of the tool ensures a good cut, avoiding any crushing of the wood, and ensures the reflux of the chips by the center of the needle.
  • the essential advantages of the hollow needle compared to the forest are that it does not require rotating equipment, which is a source of danger and is more expensive, and that it does not heat the wood locally.
  • Figure 1 is a sectional view of a piece of wood showing the penetration of an impregnated product gnation in the absence of incisions or perforations, (prior art);
  • Figure 2 shows in elevation a piece of perforated wood according to the invention and Figures 3 to 6 show in cross section various modes of perforation.
  • FIG. 1 which illustrates the prior art
  • the shaded part shows how the impregnation product penetrates negligently, in the direction of the length of the fibers, essentially along the axis of the tree trunks, in the absence of incisions.
  • the spacing is preferably greater (certainly not smaller) so as not to force the piece of wood, the easy penetration of impregnation products in this direction allowing it; this spacing is of the order of magnitude from 4 to 40 mm.
  • the new wood preparation process therefore ensures good penetration to the core; as for the deterioration of the mechanical properties, it is significantly lower than for the incision process; the derating factors of the maximum admissible tensions are of the order of 6 to 15%, depending on the arrangement of the perforations and the nature of the constraints.
  • the perforations 1, executed from a single face pass through the part; on the other hand, in FIG. 4, relating to a thicker part, the perforations 1 are executed on two opposite faces and are blind, stopping shortly before the center 3 of the part; they are aligned there opposite one another; alternatively, they can be offset.
  • the perforations 1 are radial, of equal length, stop substantially before the center 3, and are preferably arranged in a helix around the periphery of the part.
EP85870022A 1985-02-06 1985-02-06 Holzvorbereitungsverfahren zum Imprägnieren Withdrawn EP0191276A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP85870022A EP0191276A1 (de) 1985-02-06 1985-02-06 Holzvorbereitungsverfahren zum Imprägnieren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85870022A EP0191276A1 (de) 1985-02-06 1985-02-06 Holzvorbereitungsverfahren zum Imprägnieren

Publications (1)

Publication Number Publication Date
EP0191276A1 true EP0191276A1 (de) 1986-08-20

Family

ID=8194730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85870022A Withdrawn EP0191276A1 (de) 1985-02-06 1985-02-06 Holzvorbereitungsverfahren zum Imprägnieren

Country Status (1)

Country Link
EP (1) EP0191276A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2689437A1 (fr) * 1992-04-06 1993-10-08 Imprelorraine Sa Machine pour la perforation de poteaux de bois en vue de leur imprégnation par des produits chimiques.
EP3398744A1 (de) * 2017-05-04 2018-11-07 Fürstenberg-THP GmbH Imprägnierverfahren für holzschwellen und imprägnierte holzschwelle

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191024483A (en) * 1910-08-11 1911-01-26 Samuel Haltenberger Improvements in or relating to the Impregnation of Timber.
US1646955A (en) * 1922-06-30 1927-10-25 Greenlee Bros & Co Incising machine
US2036411A (en) * 1932-07-30 1936-04-07 Harbow H Hathaway Lath machine
FR67296E (fr) * 1954-11-16 1958-02-19 Procédé d'injection des poteaux de ligne en bois de sapin et d'épicéa, à l'état sec soit par la créosote fluide, qu'il empêche d'exsuder, soit par le sulfate de cuivre en dissolution
US3515184A (en) * 1966-04-27 1970-06-02 Baxter & Co J H Apparatus for deep incising poles
GB1310781A (en) * 1969-03-27 1973-03-21 Richtberg Kg Karl Treatment of wooden poles
FR2385507A1 (fr) * 1977-03-30 1978-10-27 Weserhuette Ag Eisenwerk Procede pour ameliorer la capacite d'impregnation du bois
DE2936415A1 (de) * 1977-03-30 1981-03-26 Dr. Wolman GmbH, 76547 Sinzheim Flammwidrig ausgeruestetes holz fuer bauzwecke
DE3023245A1 (de) * 1980-02-07 1981-08-13 Romande Pour L Impregnation De Verfahren zum behandeln von holz, um dessen impraegnierung mittels schutzmitteln durchzufuehren
DE3139842A1 (de) * 1981-10-07 1983-04-28 PHB Weserhütte AG, 5000 Köln Verfahren zum verbessern der traenkfaehigkeit von holz

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191024483A (en) * 1910-08-11 1911-01-26 Samuel Haltenberger Improvements in or relating to the Impregnation of Timber.
US1646955A (en) * 1922-06-30 1927-10-25 Greenlee Bros & Co Incising machine
US2036411A (en) * 1932-07-30 1936-04-07 Harbow H Hathaway Lath machine
FR67296E (fr) * 1954-11-16 1958-02-19 Procédé d'injection des poteaux de ligne en bois de sapin et d'épicéa, à l'état sec soit par la créosote fluide, qu'il empêche d'exsuder, soit par le sulfate de cuivre en dissolution
US3515184A (en) * 1966-04-27 1970-06-02 Baxter & Co J H Apparatus for deep incising poles
GB1310781A (en) * 1969-03-27 1973-03-21 Richtberg Kg Karl Treatment of wooden poles
FR2385507A1 (fr) * 1977-03-30 1978-10-27 Weserhuette Ag Eisenwerk Procede pour ameliorer la capacite d'impregnation du bois
DE2936415A1 (de) * 1977-03-30 1981-03-26 Dr. Wolman GmbH, 76547 Sinzheim Flammwidrig ausgeruestetes holz fuer bauzwecke
DE3023245A1 (de) * 1980-02-07 1981-08-13 Romande Pour L Impregnation De Verfahren zum behandeln von holz, um dessen impraegnierung mittels schutzmitteln durchzufuehren
DE3139842A1 (de) * 1981-10-07 1983-04-28 PHB Weserhütte AG, 5000 Köln Verfahren zum verbessern der traenkfaehigkeit von holz

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2689437A1 (fr) * 1992-04-06 1993-10-08 Imprelorraine Sa Machine pour la perforation de poteaux de bois en vue de leur imprégnation par des produits chimiques.
EP3398744A1 (de) * 2017-05-04 2018-11-07 Fürstenberg-THP GmbH Imprägnierverfahren für holzschwellen und imprägnierte holzschwelle

Similar Documents

Publication Publication Date Title
Lutz Wood veneer: log selection, cutting, and drying
EP0191276A1 (de) Holzvorbereitungsverfahren zum Imprägnieren
US20160152401A1 (en) Method of Making a Log Insulator
WO1997011346A1 (en) Wood corer device
FI73162B (fi) Anordning vid en motorsaog foer uppslitsning av bark- och naeverskikt pao traedstammar.
US4071637A (en) Process for punching holes and slots in structural timber
FR3073262A1 (fr) Ensemble d’ancrage pour arbre
Wdowiak Defects in structural timber
EP3347550B1 (de) Mast zum stützen eines kabels und verfahren zur herstellung des masten
Cassens Factors determining the suitability of trees and logs for the face veneer industry
FI123809B (fi) Rulla, harvesteripää ja menetelmä puunrunkojen tai oksien korjaamiseksi
US2881814A (en) Method of debarking logs
JP5384993B2 (ja) 集成材の防腐処理方法
Conopask A Data-pooling Approach to Estimate Employment Multipliers for Small Regional Economics
JPH0557709A (ja) 木製棒材の製造方法
FR2846684A1 (fr) Parpaing en bois massif
FR3070827B1 (fr) Procede de devitalisation des vegetaux
JP6935954B1 (ja) チェーンソー用のストッパー、及び、巻き枯らし間伐の作業方法
EP0555599B1 (de) Verfahren zur Herstellung von Holzfliesen
Cassens Factors affecting the quality of hardwood timber and logs for face veneer
US42252A (en) Coewin s
McElhanney Standardization of terms in forest-products research
JP2001071308A (ja) 間伐材を利用した丸棒材
FR2530177A1 (fr) Barrette de conditionnement des bois
RU2178353C2 (ru) Способ подготовки круглых лесоматериалов к пропитке

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19870428

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DE MOOR, CHARLES HENRI