EP0915748B1 - Procede pour l'impregnation de matieres organiques fibreuses hydratees, et installations pour la mise en oeuvre de ce procede - Google Patents
Procede pour l'impregnation de matieres organiques fibreuses hydratees, et installations pour la mise en oeuvre de ce procede Download PDFInfo
- Publication number
- EP0915748B1 EP0915748B1 EP96927106A EP96927106A EP0915748B1 EP 0915748 B1 EP0915748 B1 EP 0915748B1 EP 96927106 A EP96927106 A EP 96927106A EP 96927106 A EP96927106 A EP 96927106A EP 0915748 B1 EP0915748 B1 EP 0915748B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- treated
- constitution
- impregnation
- heating
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 37
- 238000009434 installation Methods 0.000 title description 16
- 239000000463 material Substances 0.000 claims description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 56
- 238000005470 impregnation Methods 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 23
- 238000001704 evaporation Methods 0.000 claims description 20
- 230000008020 evaporation Effects 0.000 claims description 17
- 230000000694 effects Effects 0.000 claims description 6
- 239000011343 solid material Substances 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 37
- 239000002023 wood Substances 0.000 description 8
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 235000013399 edible fruits Nutrition 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 235000013339 cereals Nutrition 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000011368 organic material Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 244000099147 Ananas comosus Species 0.000 description 2
- 235000009508 confectionery Nutrition 0.000 description 2
- 230000002255 enzymatic effect Effects 0.000 description 2
- 230000000855 fungicidal effect Effects 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical class N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 235000007119 Ananas comosus Nutrition 0.000 description 1
- 241000219310 Beta vulgaris subsp. vulgaris Species 0.000 description 1
- 244000141359 Malus pumila Species 0.000 description 1
- 241000209504 Poaceae Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000021536 Sugar beet Nutrition 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 235000021016 apples Nutrition 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- 229920001864 tannin Polymers 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Images
Classifications
-
- 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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0055—Radio-waves, e.g. microwaves
-
- 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
- B27K3/0207—Pretreatment of wood before impregnation
- B27K3/0221—Pore opening
-
- 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
- B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
Definitions
- the invention relates to a method for impregnating materials. hydrated fibrous organic materials, such as, for example, wood, fruit, grains or oilseeds, skins. It relates to also facilities for the implementation of this process. More in particular, the invention relates to a method and installations permitting the impregnation of fibrous organic solids hydrated by self-evaporation of water of constitution under vacuum instantaneous and overpressure injection of a solute solution to be injected.
- hydrated fibrous organic materials means any material fibrous organic comprising water of constitution occurring both in the form of free and residual water.
- examples include wood, fruits, vegetables, grains of grains or oilseeds or skins, all of which have not undergone prior desiccation phase.
- the wood is pre-dried and has moisture residual in the range of seven to eight percent (7 to 8%) and therefore presents this fact, a pre-existing porous structure.
- the phase of vacuuming only causes deaeration intended to eliminate the air included in the wood fibers.
- Document GB-A-15556 also describes a method of treatment of pre-dried wood, with almost total drying during operating phases and this by injection after degassing by vacuum effect.
- the invention relates to a method for impregnating at heart hydrated fibrous organic materials comprising water of constitution by means of a treatment liquid, such as for example a solution fungicide, a solution of hardening or flame retardant salts, a solution enzymatic for the treatment of wood, or a sugar solution for confectionery applications, or a salty solution for salted, or a solution of tannins for the treatment of the skins, etc ...
- a treatment liquid such as for example a solution fungicide, a solution of hardening or flame retardant salts, a solution enzymatic for the treatment of wood, or a sugar solution for confectionery applications, or a salty solution for salted, or a solution of tannins for the treatment of the skins, etc ...
- the wood was always previously dried or brought to a low humidity level, so that it contains air in an existing porous structure as a result of drying. We therefore seeks to eliminate this air included by heating and then evacuating in order to fill the porous structure with a treatment product.
- the material is necessarily hydrated, that is to say with its water of constitution and is not therefore not porous and contains no air significantly.
- the heating stage followed by the rapid evacuation stage by intermediate condensation of the emitted vapors causes vaporization of the water of constitution and thus the creation of a structure porous which was not pre-existing.
- the micro-channels formed ensure perfect continuity of communication between the heart of the matter, that is to say the deepest zones and the periphery thereof.
- These micro-channels are only filled with steam. So, by internal condensation of this vapor, it is possible to impregnate the core of the material any treatment solution without having to use back pressure excessive.
- the condensation of the water vapor is made instantly thanks to pressurization, the cold source then being constituted by the material itself.
- the impregnation of fibrous substances with a dissolved substance in water or any other solvent allows impregnation depth. This impregnation is done by means of a liquid previously heated to a temperature greater than or equal to the equilibrium temperature of the corresponding vacuum.
- the proportion of micro-channels formed essentially depends on the difference between the reheating temperature and that corresponding to the vacuum. The greater this difference, the greater the volume of the micro-channels trained will be important.
- the heating takes place at a pressure greater than 0.5 bar absolute, preferably at a pressure between 0.5 and 3 bars absolute, any of the known means in particular by conduction with a hot recirculating liquid or on a hot surface or steam condensation effect or use of high frequency heaters.
- Reduced pressure takes place in less than ten seconds. Indeed, it has been found that for solids of minimum dimensions located between 5 and 15 cms, the optimal vacuuming time is less to ten seconds, preferably on the order of six seconds.
- the invention also relates to two installations for setting up work of this process.
- Figure 1 is a representation of an installation for setting discontinuous work of the process according to the invention.
- FIG. 1 Figures 2a to 2d are schematic representations of the process according to the invention by means of the installation of FIG. 1.
- Figure 3 is a summary representation for the implementation continuous process according to the invention.
- the implementation of the method according to the invention can be done discontinuously, i.e. by submitting the same quantity of materials to be treated successively at the different stages of the process, either continuously, i.e. by circulating the material in different enclosures ensuring each of the process functions.
- FIG. 1 The installation described diagrammatically in FIG. 1 makes it possible to treat discontinuously the different types of materials referred to in the preamble.
- this installation mainly comprises a treatment (CT), a mixing condenser, a pressure source (SP), a vacuum device (DV), these different elements being interconnected by a network of pipes and valves, as well as appropriate recirculation.
- CT treatment chamber
- SP pressure source
- DV vacuum device
- the treatment chamber can consist of an enclosure, the autoclave type, for example stainless steel, pressure resistant and empty.
- This enclosure is associated with means for heating the material to treat which can be of various natures.
- it can be a recirculation and heating circuit liquid consisting of a pump (P1) and a surface exchanger (E1) whose function is to recover the liquid present in the bottom of the treatment chamber (CT) and reheat it then spray it on the material to be treated.
- P1 a pump
- E1 surface exchanger
- This treatment chamber (CT) is connected to the pressure source (SP) via a quick opening valve (V3), i.e. less than one second.
- This treatment chamber (CT) is also connected to the mixing capacitor (CM) by means of two valves (V1, V2) via tubing (T1, T2) of different section. In this way, depending on the circuit selected (T1, T2), and the opening speed of the valves (V1, V2), it is possible to adjust the vacuuming time.
- the mixing condenser (CM) also consists of a steel enclosure, possibly stainless. So completely essential, it contains a reserve of cold water (F), i.e. temperature significantly lower than that of the steam extracted from the material to be treated, and typically of the order of at least 25 ° C.
- This mixing condenser (CM) is associated with a recirculation circuit of cold water consisting of an exchanger (E2), for example of the type exchanger by surface, then from one or two centrifugal pumps (P2, P3) to broadband.
- This mixing condenser (CM) is connected to a vacuum device (DV) consisting essentially of a vacuum pump and so advantage of a vacuum level regulation system, in order to obtain optimal performance.
- CM mixing condenser
- DV vacuum device
- the material to be treated (M) is introduced into the treatment chamber (CT). It is heated there by any appropriate means already mentioned such as traffic and heating the impregnation solution which then constitutes the vector of calories, or else, more conventionally by introducing steam, or even by heating with high frequency waves
- valves (V1) and (V2) are open in order to set up communication the treatment chamber (CT) with the condenser mixture (CM) itself under very reduced pressure, of the order of 0.07 bar absolute at 0.09 bar absolute. It follows that this almost instantaneous vacuuming preheated material, causes self-evaporation of the water of constitution of the fibrous material (see Figure 2b). This evaporation creates in the material a network of micro-channels (5) of vapor connecting the heart of the material with its periphery.
- the extracted steam enters the mixing condenser and is condensed thanks to the presence of sprayed cold water which serves as reserve of frigories.
- the contact is brought into contact.
- material to be treated (M) with the impregnation solution (1).
- the material to be treated has been heated thanks to the impregnation solution, there is no need to additional solution introduction.
- valves (V2) and (V1) are then closed, which maintains inside the treatment chamber (CT) reduced pressure, close from that generated by the vacuum device.
- valve (V3) is open and therefore the treatment chamber (CT) is put almost instantly overpressure. This causes the introduction of the solution in the micro-channel network, right down to the heart of the matter.
- this installation includes a heating (CC), an evaporation chamber (EV), a chamber impregnation (CI), an overpressure zone (EG), and a vacuum source (SV).
- CC heating
- EV evaporation chamber
- CI chamber impregnation
- EG overpressure zone
- SV vacuum source
- the heating chamber (CC) is constituted by a enclosure open upwards to the water inside which are introduced the materials to be treated.
- this heating chamber (CC) can be equipped with different means of heating the material, namely a high frequency device (HF), or a water circulation circuit hot or hot impregnation solution consisting of a pump (PCH) drawing from the bottom of the heating chamber and bringing the hot water in a surface exchanger (ECH), then ensuring the ascent of the water hot to the top of the heating chamber (CC) for its spraying on the material to be treated.
- HF high frequency device
- the heating chamber includes a tubing (T5) equipped with a supply means, such as a screw Archimedes (6) followed by a positive displacement pump, which ensures the transport of the heated material to the evaporation chamber (EV).
- a supply means such as a screw Archimedes (6) followed by a positive displacement pump, which ensures the transport of the heated material to the evaporation chamber (EV).
- the invention covers alternative embodiments various in which the Archimedes screw can feed a rotary airlock or an airlock consisting of two guillotine valves.
- the evaporation chamber (EV) consists of an enclosure of the autoclave type, vacuum resistant, for example stainless steel. This evaporation chamber (EV) is connected, in the upper part, to the vacuum source (SV). In the lower part, the evaporation chamber (EV) includes advantageously a scraper device (7) allowing, by means of various advantageously oriented rotary blades (8), to bring the material towards the axis of symmetry of the evaporation chamber (EV).
- the bottom of the evaporation chamber (EV) has an opening (10) connected to a airlock (S2) or to an equivalent pump not shown, which connects this evaporation chamber (EV) to a tank (CI) for contacting the material with the impregnation solution (1).
- the vacuum source is for example a assembly comprising a condenser, a vacuum pump or the like vacuum device, a condensate extraction pump.
- this impregnation tank (C1) comprises a circuit for sampling the impregnation solution which leads to the by means of a pump (PS), said solution after heating to inside the evaporation chamber (EV), so as to ensure bringing the treated material into contact with the impregnation solution (1) at the time of spraying.
- PS pump
- EV evaporation chamber
- the impregnation tank (CI) is connected to the solution tank impregnation and includes a level regulator (LC) allowing control the progress of the process.
- LC level regulator
- the impregnation tank (CI) inside which the material is immersed in the impregnation solution (1) is then in overpressure with respect to the evaporation chamber.
- the impregnation tank (CI) is connected to a setting area overpressure constituted by a tube comprising a screw Archimedes (11) ensuring the elevation of the material for its outlet (12) from the installation.
- this Archimedes screw (11) is driven by a motor not shown at a speed calculated to ensure a time of stay under pressure sufficient to induce impregnation at the heart of matter.
- the value of the overpressure to which the material to be treated is subjected is controlled by the pressure regulator (PC) connected to the screw Archimedes (11).
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Reinforced Plastic Materials (AREA)
Description
- dans un premier temps, on élimine l'air disposé entre les multiples fibres du bois par dépression dans une enceinte hermétique.
- puis dans une seconde phase, on imprégne les plateaux de paraffine ou analogues.
- des durées de mise en oeuvre longues, de l'ordre de 5 minutes pour la mise sous vide, et de 10 minutes pour la mise en pression, ce qui ne provoquent pas de destructuration supplémentaire de la matière ;
- une pénétration en profondeur limitée, due à une destructuration insuffisante de la matière ;
- enfin, la mise en oeuvre d'un dispositif spécifique pour créer une forte pression de 5 à 10 bars pour l'injection.
- tout d'abord, à chauffer l'eau de constitution de la matière ;
- puis, à mettre en moins de 10 secondes ladite matière chaude sous une pression réduite, de manière à créer un réseau de micro-canaux assurant une communication sensiblement depuis le coeur jusqu'à la périphérie de la matière par effet de vaporisation d'une partie essentielle de l'eau de constitution ;
- puis, à mettre la matière ainsi traitée en contact avec un liquide d'imprégnation ;
- et enfin, à instaurer en moins de 1 seconde une surpression, de manière à faire pénétrer le liquide d'imprégnation dans les micro-canaux formés.
- dans une première phase, à chauffer une matière organique fibreuse hydratée, c'est-à-dire contenant l'essentiel de son eau de constitution (eau libre et eau résiduelle), de préférence au voisinage de 100°C pour accumuler de l'énergie dans l'eau de constitution ;
- puis, dans une deuxième phase, à mettre rapidement ladite matière chaude sous une pression réduite en un temps très court, de l'ordre de quelques secondes, de manière à créer à l'intérieur de ladite matière un réseau de micro-canaux qui seront ainsi maintenus ouverts par la structure fibreuse et remplis uniquement de vapeur d'eau, lesdits micro-canaux se dirigeant essentiellement radialement depuis le coeur jusqu'à la périphérie de la matière grâce à l'effet de vaporisation d'une partie essentielle de l'eau de constitution libre ou résiduelle ;
- puis, dans une troisième phase, à mettre au voisinage de l'extrémité extérieure de ces micro-canaux une solution d'un liquide d'imprégnation qui, grâce à la condensation de la vapeur des micro-canaux, va créer un système d'aspiration de la solution placée en périphérie ;
- et enfin, dans une quatrième phase, à augmenter rapidement la pression, par exemple de l'ordre de la seconde, de manière à faire pénétrer à coeur le liquide d'imprégnation dans les micro-canaux formés.
- le chauffage préalable de la matière (1ère phase) est effectué par tout moyen approprié, tel que par exemple la conduction avec une surface chaude ou avec un liquide chaud recirculant, voire par utilisation d'ondes haute-fréquence ;
- la mise sous vide instantanée (2ème phase) de la matière préchauffée provoque une auto-évaporation de l'eau de constitution qui crée dans cette matière un réseau nouveau de micro-canaux de vapeur différent de ce que l'on obtenait lors du séchage. L'importance du dégagement de vapeur d'eau instantané (voisin de 2,5 m3 émis en une seconde pour un kilo de matière traitée) fait que si les canaux existants sont utilisés pour l'évacuation de cette vapeur d'autres voies se créent, les premières étant insuffisantes pour assurer le débit ;
- la mise au contact avec le liquide d'imprégnation s'effectue à une température égale ou tout au plus légèrement supérieure à celle de la matière concernée, cette introduction pouvant se faire avant ou après la mise sous vide ;
- enfin, la mise sous pression très rapide de l'enceinte de traitement provoque l'introduction de la solution.
- des moyens de chauffage (E1,P1) de la matière à traiter contenue
dans une chambre de traitement (CT) reliée :
- d'un part, à une source de pression (SP) par une vanne (V3) ;
- d'autre part, à une source de vide par une vanne (V1,V2), dont la rapidité d'ouverture permet de moduler le temps nécessaire à la mise en dépression de la chambre, la source de vide étant constituée d'un condenseur à mélange (CM) contenant une réserve d'eau froide (F) dans sa partie basse et comportant un circuit de recirculation de l'eau froide (E2,P2,P3), ce condenseur étant relié, en partie haute, par une tuyauterie, à un dispositif de vide (DV) ;
- des moyens d'introduction (DC) d'un liquide d'imprégnation dans la chambre de traitement (CT).
- des moyens pour introduire en continu la matière à traiter dans une chambre de chauffe (CC) ;
- une chambre d'évaporation (EV) reliée, d'une part, à la chambre de chauffe (CC) par un sas (S1) permettant le passage de la matière à traiter et, d'autre part, à une source de vide (SV) ;
- une chambre d'imprégnation (CI,EG) reliée d'une part, à la chambre d'évaporation (EV) par un sas (S2) permettant le passage de la matière à traiter, et d'autre part, à un moyen (PC) de mise en surpression ;
- des moyens d'amenée d'un liquide d'imprégnation dans les chambres d'évaporation et d'imprégnation.
- l'imprégnation en profondeur de bois avant séchage par des produits fongicides permettant d'améliorer la longévité d'utilisation ;
- l'imprégnation des graines de céréales par une solution enzymatique afin de liquéfier l'amidon en évitant par là une mouture préalable ;
- l'imprégnation de fruits fibreux tels que des pommes ou des ananas par une solution sucrée afin de réduire le temps de préparation lorsque l'on désire confire ces fruits ; éventuellement, le procédé peut être appliqué par imprégnations successives ;
- l'imprégnation de graines oléagineuses par des solutions facilitant l'extraction des matières grasses ;
- l'imprégnation de racines, tels que les betteraves sucrières pour les épurer à coeur ;
- l'imprégnation de peaux par des solutions de tannage.
Claims (9)
- Procédé pour l'imprégnation d'une matière solide organique fibreuse hydratée comportant de l'eau de constitution, procédé consistant :tout d'abord, à chauffer l'eau de constitution de la matière ;puis, à mettre en moins de 10 secondes ladite matière chaude sous une pression réduite, de manière à créer un réseau de micro-canaux assurant une communication sensiblement depuis le coeur jusqu'à la périphérie de la matière par effet de vaporisation d'une partie essentielle de l'eau de constitution ;puis, à mettre la matière ainsi traitée en contact avec un liquide d'imprégnation ;et enfin, à instaurer en moins de 1 seconde une surpression, de manière à faire pénétrer le liquide d'imprégnation dans les micro-canaux formés.
- Procédé selon la revendication 1, caractérisé en ce que le chauffage de l'eau de constitution de la matière est obtenu par conduction avec une surface chaude.
- Procédé selon la revendication 1, caractérisé en ce que le chauffage de l'eau de constitution est réalisé par conduction avec un liquide chaud circulant.
- Procédé selon la revendication 1, caractérisé en ce que le chauffage de l'eau de constitution est réalisé par ondes à hautes fréquences.
- Procédé selon la revendication 1, caractérisé en ce que le chauffage de la matière à traiter s'effectue à une pression supérieure à 0,5 bar absolu et inférieure à 3 bars absolu.
- Procédé selon la revendication 1, caractérisé en ce que la mise au contact de la matière à traiter avec le liquide d'imprégnation s'effectue à une température légèrement supérieure ou égale à celle de la matière à traiter.
- Procédé selon la revendication 1, caractérisé en ce que la mise au contact de la matière à traiter avec le liquide d'imprégnation s'effectue sans variation de la pression réduite.
- Installation pour la mise en oeuvre du procédé selon les revendications 1 à 7, pour l'imprégnation en discontinu d'une matière solide organique fibreuse hydratée, comportant de l'eau de constitution, installation comprenant :des moyens de chauffage (E1,P1) de la matière à traiter contenue dans une chambre de traitement (CT) reliée :d'un part, à une source de pression (SP) par une vanne (V3) ;d'autre part, à une source de vide par une vanne (V1,V2), dont la rapidité d'ouverture permet de moduler le temps nécessaire à la mise en dépression de la chambre, la source de vide étant constituée d'un condenseur à mélange (CM) contenant une réserve d'eau froide (F) dans sa partie basse et comportant un circuit de recirculation de l'eau froide (E2,P2,P3), ce condenseur étant relié, en partie haute, par une tuyauterie, à un dispositif de vide (DV) ;des moyens d'introduction (DC) d'un liquide d'imprégnation dans la chambre de traitement (CT).
- Installation pour la mise en oeuvre du procédé selon les revendications 1 à 6, pour l'imprégnation en continu d'une matière solide organique fibreuse hydratée comportant de l'eau de constitution, installation comprenant :des moyens pour introduire en continu la matière à traiter dans une chambre de chauffe (CC) ;une chambre d'évaporation (EV) reliée, d'une part, à la chambre de chauffe (CC) par un sas (S1) permettant le passage de la matière à traiter et, d'autre part, à une source de vide (SV) ;une chambre d'imprégnation (C1,EG) reliée d'une part, à la chambre d'évaporation (EV) par un sas (S2) permettant le passage de la matière à traiter, et d'autre part, à un moyen (PC) de mise en surpression ;des moyens d'amenée d'un liquide d'imprégnation dans les chambres d'évaporation et d'imprégnation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR1996/001199 WO1998004391A1 (fr) | 1996-07-30 | 1996-07-30 | Procede pour l'impregnation de matieres organiques fibreuses hydratees, et installations pour la mise en oeuvre de ce procede |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0915748A1 EP0915748A1 (fr) | 1999-05-19 |
EP0915748B1 true EP0915748B1 (fr) | 2000-05-17 |
Family
ID=9488716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96927106A Expired - Lifetime EP0915748B1 (fr) | 1996-07-30 | 1996-07-30 | Procede pour l'impregnation de matieres organiques fibreuses hydratees, et installations pour la mise en oeuvre de ce procede |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0915748B1 (fr) |
ES (1) | ES2145476T3 (fr) |
WO (1) | WO1998004391A1 (fr) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190815556A (en) * | 1908-07-22 | 1909-03-18 | Johann Polifka | Improvements in or relating to the Impregnation of Wood |
US1680529A (en) * | 1927-04-08 | 1928-08-14 | Brown Co | Method of treating wood |
FR2116774A5 (en) * | 1970-12-02 | 1972-07-21 | Mathevet Raymond | Wooden platters - for supporting food,impregnated with paraffin(ic cpd) |
US4187346A (en) * | 1978-08-22 | 1980-02-05 | Shelby-Williams Industries, Inc. | Controlled permeation process for fireproofing wood |
NZ220816A (en) * | 1987-06-23 | 1989-12-21 | Nz Minister Forestry | Gaseous or vapour phase treatment of wood with boron preservatives |
FR2733438B1 (fr) * | 1995-04-27 | 1997-06-13 | Cogat Pierre Olivier | Procede et equipements d'impregnation de matieres solides organiques fibreuses, par vaporisation sous vide de l'eau de constitution et injection en contrepression d'une solution |
-
1996
- 1996-07-30 EP EP96927106A patent/EP0915748B1/fr not_active Expired - Lifetime
- 1996-07-30 ES ES96927106T patent/ES2145476T3/es not_active Expired - Lifetime
- 1996-07-30 WO PCT/FR1996/001199 patent/WO1998004391A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ES2145476T3 (es) | 2000-07-01 |
EP0915748A1 (fr) | 1999-05-19 |
WO1998004391A1 (fr) | 1998-02-05 |
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