WO2008049811A1 - Procédé de traitement pour base d'impression de papier mélamine - Google Patents
Procédé de traitement pour base d'impression de papier mélamine Download PDFInfo
- Publication number
- WO2008049811A1 WO2008049811A1 PCT/EP2007/061299 EP2007061299W WO2008049811A1 WO 2008049811 A1 WO2008049811 A1 WO 2008049811A1 EP 2007061299 W EP2007061299 W EP 2007061299W WO 2008049811 A1 WO2008049811 A1 WO 2008049811A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin
- paper
- processing method
- based mixture
- pigment
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C5/00—Processes for producing special ornamental bodies
- B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
- B44C5/0469—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/18—Paper- or board-based structures for surface covering
- D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
- D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
Definitions
- the invention relates to thin papers used in laminated or laminated decorations, as well as to their manufacturing processes.
- the invention relates more precisely to the bases of printing of melamine papers, for the production of parquet or high-end furniture.
- Finished sheets are papers that are adhered to the desired support
- Japanese paper Japanese Laida paper
- their grammage weight of the sheet per square meter in g m -2
- This paper has a good internal cohesion and a high smoothness giving it printability and lacquering, but its transformation and collage are delicate as it tends to bulge (deformation from planarity).
- roller located on the paper machine, consisting of a pair of superimposed cylinders, whose arrangement can be horizontal or inclined (pre-impregnated cases, which then have a low warp but a higher cost and a less smoothed Japanese paper), either at the processor (in the case of post-impregnated manufacturing is higher because of the recovery of the process on different machines).
- the paper passes through a soaking bath that forms between each cylinder and the sheet of paper. In this type of machine, it does not control the exact amount deposited on the paper and no more the amount that penetrates deep into the heart of the paper.
- this machine having a single feed dipping bath, it is impossible to make differentiated deposits from one side to the other of the sheet of paper.
- the fact that the paper completely through the soaking bath would make it impossible to deposit such differentiated deposits since the two products would mix with each other at the heart of the paper during soaking .
- the physical characteristics of the finished sheets thus obtained do not allow their use in all types of application. They are suitable for the manufacture of low-end furniture panels, vertical surfaces, etc. but their resistance to blows, abrasion, heat, liquids, light, or chemicals is low.
- melamine papers are preferably made, either by a low pressure technique or by a high pressure technique.
- These melamine papers include: - a decorative sheet, a cover sheet, which gives the stack specific characteristics of strength, and protects the decorative sheet stains, abrasion and scratches.
- the cover sheet is composed of a cellulosic material, free of impurities and low opacity, which contains optionally mineral pigments to increase its resistance to abrasion and hardness.
- the pigment is chosen so that, following its impregnation, it induces neither appearance of color in the laminate, nor increased opacity, which would mask a pattern printed on the underlying decorative sheet.
- the cover sheet generally has a basis weight of about 20 to 40 g. m "2 , which increases to 75 to 100 g / m 2 after being impregnated.
- the decorative sheet and the cover sheet are impregnated with a mixture of thermosetting resins and catalysts, and then applied to a panel (the back of which is usually applied a counterbalancing sheet for dimensionally stabilize the formed complex) by means of a low pressure press.
- the resin then diffuses in the stack of sheets, and allows their strong adhesion to the panel.
- the finished sheets can not be used in a low (or high) pressure technique: their constituent material and their treatment do not allow their optimal impregnation with resins. That is why they are glued by means of a film of glue on the support panel which they must decorate. But this technical solution does not offer surface characteristics, scratch resistance, abrasion, sufficient to be used in the application of parquet floors, worktops or high-end furniture.
- EP 0 870 872 discloses a process for obtaining a thin paper of the finished sheet type, in which pigments (with the aid of a binder) are coated on the printing or lacquering surface of the paper , the face opposite the coating being impregnated with an impregnating resin.
- the absorption of the resin by the paper amounts to only 5% to 30% by weight, based on the raw paper, the paper used in the manufacture of finished sheets not normally intended for to be impregnated. Otherwise, since no resin is present on its printing face, it has no particular dimensional stability.
- the melamine paper on the other hand, has a high dimensional stability and an increased resistance to abrasion and scratches compared to the finished sheets. This is why they are preferred in applications such as the production of parquet and high-end furniture.
- a cover sheet is also applied to a decorative sheet.
- one or more sheets of kraft paper are placed under the decorative sheet.
- the complex thus formed is then impregnated with a melamine resin, before being placed in a press which applies a high pressure (and a high temperature), so as to obtain a "sandwich" of great density and great hardness.
- the cost of high pressure papers is 30% to 40% higher than that of low pressure laminates. They are used for example in the manufacture of work plans. Their mechanical performance, including their resistance to moisture or their temperature resistance, but also their resistance to abrasion and scratches, are much better.
- the patent application WO 02/079571 describes for example a method of manufacturing a low pressure printing base, during which a composition comprising, on the upper surface, then optionally on the lower surface, is applied. a formaldehyde resin, an acrylic latex and a hardener.
- a formaldehyde resin an acrylic latex
- a hardener an acrylic latex
- This process makes it possible to reduce the grammage of the paper weighing between 15 g. m “2 and 60 g. m " 2 , as well as the amount of impregnated resin, while improving the mechanical characteristics of the printing base obtained.
- the method used requires two to three successive stages for the impregnation of the layers, which increases its time and cost of manufacture without improving the quality of printing compared to the state of the art.
- Patent application WO 01/21892 for its part proposes a process for manufacturing paper for impregnation with synthetic resins, applicable to low and high pressure techniques, comprising the steps of impregnating the paper with a first mixture A based on resins, then, or simultaneously, to apply a second resin-based mixture B, preferably identical to the mixture A. Following a drying step, a third resin-based mixture C is then applied to at least one of the faces, preferably of the same composition as the mixture A. Thanks to the pretreatment step of this process, the paper obtained has a better quality of printing. However, the process requires many production steps, and therefore leads to an increase in its manufacturing cost.
- An object of the invention is to provide a printing base for melamine paper having a low basis weight according to a low pressure technique.
- Another object of the invention is to provide, in a single industrial operation, a printing base for melamine paper using a low pressure technique that combines greater dimensional stability than the state-of-the-art melamine papers when it is printed. and its transformation and superior print quality.
- Another object of the invention is to provide a printing base for melamine paper according to a low pressure technique, the print quality of which is greater than that of the state-of-the-art melamine papers, so that get a larger print result, or reduce the level necessary inking with a print rendering equivalent to that of the state of the art, in order to reduce printing costs.
- Another object of the invention is to provide a printing base for melamine paper according to a low pressure technique capable of being easily transformed, by increasing its mechanical strength and its cohesive strength.
- Another object of the invention is to implement a low pressure manufacturing process of a printing base for melamine paper, to reduce the amount of impregnated resin during its processing.
- Another object of the invention is to implement a low pressure manufacturing process of a melamine paper printing base, the production costs of which are reduced compared to known methods.
- the invention proposes a paper tape processing method for the manufacture of a melamine paper printing base, for application to a low pressure impregnation technique, comprising the steps of: a) realizing a paper based on weakly refined fibers, the paper having pigments, b) coating a resin-based mixture on the upper surface of the paper, to be printed, c) coating a resin-based mixture on the lower surface of the paper, paper, intended to be applied against a panel, d) drying the paper,
- the coating steps (b) and (c) are simultaneous, and the coated on the top and bottom surfaces of the paper have a different composition.
- the method comprises an additional step e) of treating at least one of the coated surfaces during steps (b) or (c) in soft calenders.
- steps (a) to (e) are advantageously performed directly on the same paper machine.
- FIG. 1 illustrates the impregnation of a sheet of paper by injection nozzles according to the invention
- Figure 2 is a sectional view of Figure 1.
- the laminate floors include, as we have seen, a decorative sheet, a cover sheet, a particle-based board (MDF (for Medium Density Fiber, medium density fiber), HDF (for High Density Fiber, fiber to high density), etc.) and a cover sheet.
- MDF Medium Density Fiber, medium density fiber
- HDF High Density Fiber, fiber to high density
- the invention relates to the improvement of the process for the treatment of papers used as printing bases (decorative sheets) of melamine papers, the covering sheet being applied, if necessary, by the transformer.
- a support paper based on weakly refined fibers comprising a mixture of 50 to 20% by weight of long fiber pulp (resinous) and 50 to 80% by weight of short fiber pulp ( Hardwood).
- Long fibers are fibers of 3 to 5 mm, derived from softwoods such as pine, spruce, radiata pine or Douglas fir.
- Short fiber pasta of the order of 1 to 2 mm, comes from eucalyptus, acacia, maple, birch or chestnut, for example.
- composition of this mixture is chosen to form a support particularly adapted to its impregnation at heart by resins which will be coated on the faces of the paper.
- the percentage of short fibers (50 to 80%) makes it possible to improve the formation of the sheet while the percentage of long fibers (50 to 20%) form a canvas whose filling of the holes is made by means of short fibers, which creates a porosity of the support adapted to the filling of the resins heart.
- the basis weight of the backing paper could be between 40 and 43 gm -2 .
- the support paper are also present pigments known in the industry to give it a certain whiteness (to optimize the contrast of the decor) and sufficient opacity to prevent a pattern or defect of the board can be seen through the lens. paper thickness (transvision).
- titanium oxide TiO 2 can be used in a percentage ranging from 10% to 30% of the mass of the paper.
- a grade is chosen which gives the material good aging and light stability.
- inorganic pigments are also added to the paper, such as for example Kaolin, so as to further improve the opacity of the paper (from 0% to 20% of the weight of the dry paper base, according to the pigments).
- the mineral pigments are indeed excellent inter-fiber filling materials. The addition of these pigments combined with a low degree of refining of the fibrous mixture leads to high porosity levels for the base paper base (eg gurley porosity ⁇ 20 s).
- additives improving the resistance of the material such as a polyamide epichlorohydrin resin (PAE), at a rate of 0.1% to 1.5% of the mass of the dry paper base, which is an agent known in paper mill for its characteristics of resistance in the wet state.
- PAE polyamide epichlorohydrin resin
- the pH of the fibrous suspension is maintained close to the neutral pH in the wet part of the machine, in order to promote the crosslinking of the impregnated resins.
- all the steps of the manufacturing process are carried out in a weakly basic or acidic medium corresponding to a pH of between 6.5 and 7.5. This is to increase the rate of crosslinking of the resins, an important element of the process, since it provides for incorporating into the paper a maximum of resin at the top of the paper machine and it is important that the resin stored in the paper is fully reticulated when the paper web comes out of the paper machine.
- the crosslinking of the resins is faster in a substantially neutral medium.
- the resins being relatively basic (pH between 7.7 and 8.5), it is therefore important that the bath of the pulp is at a pH between 6.5 and 7.5 to neutralize the resins and thus improve their rate of crosslinking.
- a differential coating of the paper formed directly on the paper machine is implemented by means of a "film-press” or “film-sizer".
- This differential coating consists of depositing simultaneously on the upper surface (which corresponds to the surface that will be in contact with the cover sheet) and on the lower surface
- the film-press or film-sizer is a double-sided coating device using worms 3a, 3b called “pencils” or blades for driving in a controlled manner the coating composition on pressure rollers 2a,
- the roll 2a placed on one side of the paper 1, makes it possible, by compressing the paper 1 against the second roll 2b, to drive it in the direction and the direction of travel 10.
- Each worm 3a, 3b is in contact with the roller 2a, 2b corresponding.
- the principle of volumetric deposition related to the diameter of the spirally wound metal wires around the roller 3a-3b makes it possible to finely control the volume of each deposited composition.
- the recovery bins 4a and 4b are disposed respectively under the worm 3a and 3b to recover and recycle each excess resin mixture.
- each tray 4a, 4b is connected to a respective recycling circuit, in order to take into account separately the composition collected on each side of the paper.
- composition of the layer applied to the lower surface whose grammage represents between 20% and 40% of the final basis weight of the paper, is preferably composed of:
- At least one mineral pigment such as Kaolin, in a proportion of from 0% to 40% of the composition by dry weight, preferably 28%.
- thermosetting resin which may be either a urea resin or formaldehyde resin, in a proportion of 30% to 80% of the composition by dry weight, preferably 36%, or an acrylic resin, melamine, aldehyde, modified urea formic acid, or a resin not releasing formaldehyde during its crosslinking and drying.
- the resins of the lower layer are intended to provide resistance to the delamination of the paper when it is adhered thanks to the diffusion of the resins on the support panel on which the paper is applied, by increasing the internal cohesion of the material, and by stiffening.
- a synthetic latex in a proportion of 20% to 50% of the composition by dry weight, preferably 36%, such as a styrene-acrylic latex with a glass transition temperature Tg greater than 20-25 °.
- This latex is indeed self-crosslinking, and leads, unlike the resin, a flexibility to the material, to avoid making it too brittle.
- a catalyst of the resin in a proportion of 0.2% to 5% of the mass of resin used.
- the catalyst chosen depends, of course, on the thermosetting resin composing the layer.
- a hardener based on inorganic salts will be chosen as the catalyst, whereas if the choice of resin has been based on an acrylic, melamine, aldehyde, formic or modified urea resin, the catalyst may be be paratoluene sulfonic acid (ATPS).
- ATPS paratoluene sulfonic acid
- the bottom layer then has a basis weight of 27% of the basis weight of the decorative sheet (i.e., base paper).
- a paper With this specific composition of the lower layer of the paper, a paper is obtained whose dimensional stability is significantly improved.
- the resin mixture indeed coats the fibers thus preventing water from entering the heart of the fibrous network.
- the catalyst used promotes this hydrophobicity. It plays a role in insolubilizing the thermosetting resin by increasing the water resistance of the treated paper. Thus, during its printing and processing, the paper does not undergo expansion or shrinkage despite changes in the degree of humidity, which significantly reduces the scrap rate at the end of production.
- the level of dimensional stability of a paper obtained according to the process of the invention is 0.5%, whereas with a standard paper, the level of stability is 2.5% to 3%.
- composition of the layer applied on the upper surface which is deposited at a rate of 2 g. m "2 to 10 gm -2" on the paper, consists of:
- At least one mineral pigment such as Kaolin
- Kaolin in a proportion of 60% to 95% of the composition by dry weight, preferably 88%.
- This resin serves as a binder to the pigmentary part of the layer, and is compatible with the impregnating resins used during the processing.
- a catalyst of the resin in a proportion of 0.2% to 1% of the mass of resin used, such as paratoluene sulphonic acid (ATPS).
- ATPS paratoluene sulphonic acid
- This specific composition of the top layer deposited on one side of the paper, face intended for printing increases the print quality of the final paper.
- this highly pigmented layer makes it possible to achieve high levels of smoothness, and thus an excellent surface state, as well as very good printing results.
- the contact between the print head and the paper then becomes more regular, which makes it possible to obtain an image of greater optical density, or with a more regular contrast.
- the print result is better; and with equal print quality, the amount of ink used can be reduced, resulting in saving printing costs.
- pigments can of course be used, such as titanium dioxide (TiO 2 ) or calcium carbonate (CaCOs).
- a final paper having a basis weight of 56 g is obtained.
- the respective basis weights of the layers are 40-43 g. m 2 , 12 g, m 2 and 4 g. m 2 to 5 g m -2 .
- the dimensional stability of the paper is superior to the products of the state of the art.
- the resins composing the lower layer penetrate the core of the paper by their nature while the resin of the upper layer associated with the pigments remains mostly on the surface, thus allowing the inks during printing not to be diluted in the paper. paper thickness and therefore keep a sharp impression sharpness.
- a soft shell is a shell consisting of rolls covered with elastic materials on the one hand, and rollers having a hard surface on the other hand.
- a hard roll and a soft roll covered for example with a polyurethane coating, it allows to apply different calendering pressures on both sides of the paper, while maintaining a high opacity of the paper .
- the surface treatment is applied mainly to the upper layer in order to improve the printing characteristics, especially its smoothness. During the operation, according to the invention, it is possible to obtain Bekk smooths greater than 300 seconds.
- the paper thus obtained is applied to the desired panel, such as a floorboard or parquet, behind which is usually placed a counter-balancing sheet, to stabilize the dimensionally complex complex thus formed.
- a pressure of the order of 2.1 to 2.8 MPa is then applied by means of a low pressure press, the stack comprising the decorative paper, the cover sheet, the panel and the counterbalancing sheet, at a temperature between 105 0 C and 225 0 C, for a period of time ranging from 30 seconds to 40 seconds.
- diffusion of the impregnated resin into the stack diffuses and renders the cover sheet transparent.
- the amount of impregnating resins (used to impregnate the cover sheet and the printing base obtained by the process) required for paper processing can be reduced. , during the low pressure technique. This is made possible by the fact that, by means of the film-press at the beginning of the process, a large quantity of resin coming from the lower layer is already present in the paper structure, which will make it possible to reduce the amount of resin that will be necessary and even possible to penetrate the paper during the final impregnation operation after printing.
- the weight of the final melamine paper obtained is proportionally reduced.
- the lowering of the grammage and the amount of impregnated resin mechanically induces a proportional decrease in basis weight and impregnation at the level of the counter-balancing sheet.
- the counterbalancing sheet when making the laminate floor, the counterbalancing sheet must necessarily have a weight equal to that of the top layer applied to the panel, to avoid any deformation of the paper and the panel, such as the bulge.
- Such a method according to the invention combines the particular advantages of different products that the state of the art did not allow to gather on the same product in a single step.
- the invention also relates to paper strips for the production of a printing base, obtained according to the method of the invention and such that, on their upper face, is coated a resin-based mixture and that, on their underside, is coated a resin-based mixture different from the first mixture.
- the resin-based mixture coated on the bottom surface comprises:
- the resin-based mixture coated on the upper surface comprises at least one resin, a pigment, and a resin catalyst.
- the resin may be an acrylic resin, melamine, aldehyde, formic, urea modified as described above and the resin catalyst will be paratoluene sulfonic acid.
- the resin may be a resin not releasing formaldehyde during its crosslinking and drying.
- the resin-based mixture coated on the upper surface may comprise according to the invention: 5% to 40% of resin,
- the invention also relates to the floor elements comprising paper strips, as described above, and may further comprise a cover sheet and a counterbalancing sheet.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0716282-0A2A BRPI0716282A2 (pt) | 2006-10-26 | 2007-10-22 | Processo de tratamento para tira de papel, tire de papel e elemento de parquê |
EP07821663A EP2079877A1 (fr) | 2006-10-26 | 2007-10-22 | Procédé de traitement pour base d'impression de papier mélamine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MC2527 | 2006-10-26 | ||
MC2527A MC200104A1 (fr) | 2006-10-26 | 2006-10-26 | Nouvelle méthode de production de la couche imprimée imitation bois dans le produit sols stratifiés par une machine à papier munie d'une filmpresse etd'une softcalandre |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008049811A1 true WO2008049811A1 (fr) | 2008-05-02 |
Family
ID=38950760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/061299 WO2008049811A1 (fr) | 2006-10-26 | 2007-10-22 | Procédé de traitement pour base d'impression de papier mélamine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2079877A1 (fr) |
CN (1) | CN101622400A (fr) |
BR (1) | BRPI0716282A2 (fr) |
MC (1) | MC200104A1 (fr) |
WO (1) | WO2008049811A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105862502A (zh) * | 2016-03-30 | 2016-08-17 | 宁波艾克威特智能科技有限公司 | 一种装饰原纸制备方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105034572A (zh) * | 2015-07-10 | 2015-11-11 | 安徽本色印刷有限公司 | 包装纸带单面涂胶印刷装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3716395A (en) * | 1967-10-31 | 1973-02-13 | Kuraray Co | Process of producing pigmented, a hardenable resin containing paper sheets, and products |
EP1035255A1 (fr) * | 1999-03-12 | 2000-09-13 | Premark RWP Holdings, Inc. | Dispositif et méthode pour traiter les deux côtés d'une feuille |
WO2001021892A1 (fr) * | 1999-09-21 | 2001-03-29 | Ernst Heller | Procede de traitement de bandes de papier, et papier pour impregnation par des resines synthetiques |
-
2006
- 2006-10-26 MC MC2527A patent/MC200104A1/fr unknown
-
2007
- 2007-10-22 CN CN200780047680A patent/CN101622400A/zh active Pending
- 2007-10-22 BR BRPI0716282-0A2A patent/BRPI0716282A2/pt not_active Application Discontinuation
- 2007-10-22 WO PCT/EP2007/061299 patent/WO2008049811A1/fr active Application Filing
- 2007-10-22 EP EP07821663A patent/EP2079877A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3716395A (en) * | 1967-10-31 | 1973-02-13 | Kuraray Co | Process of producing pigmented, a hardenable resin containing paper sheets, and products |
EP1035255A1 (fr) * | 1999-03-12 | 2000-09-13 | Premark RWP Holdings, Inc. | Dispositif et méthode pour traiter les deux côtés d'une feuille |
WO2001021892A1 (fr) * | 1999-09-21 | 2001-03-29 | Ernst Heller | Procede de traitement de bandes de papier, et papier pour impregnation par des resines synthetiques |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105862502A (zh) * | 2016-03-30 | 2016-08-17 | 宁波艾克威特智能科技有限公司 | 一种装饰原纸制备方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101622400A (zh) | 2010-01-06 |
EP2079877A1 (fr) | 2009-07-22 |
BRPI0716282A2 (pt) | 2013-12-24 |
MC200104A1 (fr) | 2007-12-12 |
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