233 results about "Softwood" patented technology

The invention relates to the field of machining, and discloses an adjustable wood-working machining multifunctional clamping and positioning method which comprises the following steps: S1, acquiring three-dimensional space position information of a workpiece through laser scanning, and generating point cloud data containing a texture trend; s2, analyzing geometrical characteristics and mechanical characteristics of the workpiece based on the point cloud data, generating a clamping position distribution instruction and matching a clamping mode; s3, a grading pressure threshold value is set according to the wood density grade, and cooperative force application control of multiple clamping arms is dynamically adjusted based on distributed pressure feedback; and S4, fusing the vibration spectrum and the visual displacement data to monitor the position offset of the workpiece in real time. Through a dynamic pressure balancing strategy, according to wood density grading, pressure threshold values are set, gradient pressure control is conducted on hardwood, slope changes are limited, pre-pressing relaxation time is configured for cork wood, multiple clamping arms are adjusted in real time to cooperatively apply force through distributed feedback, and the structural integrity of wood of different densities is guaranteed.

The invention discloses environment-friendly high-barrier packaging paper and a preparation method thereof, and belongs to the technical field of paper product manufacturing. The method comprises the following steps: dispersing bleached sulfate softwood pulp in an aqueous solution of TEMPO and NaBr, adding a NaClO solution, adjusting the pH value, carrying out a reaction, washing the product obtained by the reaction, and carrying out high-pressure homogenization to obtain TEMPO oxidized nanocellulose (TOCNF); mixing the bleached sulfate softwood chemical pulp, hardwood pulp and viscose fibers, pulping, papermaking and the like to obtain original paper; then, TOCNF and waterborne epoxy modified acrylic emulsion are mixed, and a mixed coating is prepared; and finally, coating the surface of original paper with the coating according to a certain mass ratio, and carrying out hot-pressing curing to obtain the environment-friendly high-barrier packaging paper. The packaging paper is excellent in mechanical property, high in barrier property, good in surface uniformity and printing property, environment-friendly and degradable in raw materials, simple to prepare and low in cost.

The invention discloses base paper for aluminum spraying and a preparation method thereof, and relates to the technical field of base paper. The preparation method comprises the following steps: pulping softwood pulp, then adding deionized water to dilute the softwood pulp until the mass concentration is 0.8%-1%, then adding modified gel particles, modified bentonite and a PAE wet strength agent, adjusting the pH value to 6.5-7.5, stirring for 40-60 minutes, and then adding deionized water to dilute the softwood pulp until the mass concentration is 0.5%-0.7% to obtain mixed paper pulp; and then making the mixed paper pulp into paper sheets, squeezing, drying, coating the surface layer coating on the surface of base material paper, and drying with hot air to obtain the body paper for aluminum spraying. According to the invention, the modified gel particles and the modified bentonite are added, so that the mildew-proof and moisture-proof capabilities of the base paper for aluminum spraying are effectively improved; the introduction of the surface coating further improves the mildew-proof and moisture-proof capabilities. Therefore, the method has a wider application prospect.

The invention relates to the field of paper for aluminum electrolytic capacitors, and discloses a preparation method of a high-liquid-absorption high-voltage electrolytic capacitor diaphragm. The whole diaphragm is prepared from high-beating-degree and high-purity insulating softwood pulp, so that high unit thickness voltage resistance can be ensured. The adopted preparation method is a continuous drying mode, the drying efficiency is higher than that of a gap drying mode, after the fibers are formed through a fourdrinier wire, heating drying is firstly adopted, and then freezing decompression drying is adopted, so that fine pore structures among the fibers can be effectively increased, the high voltage resistance of the diaphragm is reserved, and the liquid absorption performance of the diaphragm is also greatly improved; therefore, ion moving resistance is reduced and diaphragm internal resistance is reduced.

The invention discloses a cellulose paper-based diaphragm for a zinc-iodine battery as well as a preparation method and application of the cellulose paper-based diaphragm. The diaphragm is of a three-layer composite structure and comprises a matrix layer formed by paper pulp fibers such as softwood pulp, hardwood pulp, bamboo pulp or straw pulp through a wet papermaking technology, and compact functional layers which cover the two sides of the matrix layer and are formed by oxidized nanocellulose (TOCN). The preparation method mainly comprises the following steps: preparing the paper-based diaphragm matrix through wet papermaking, coating the two sides of the paper-based diaphragm matrix with TOCN aqueous dispersion, and finally carrying out hot-pressing drying treatment to enable the three layers to be tightly combined. According to the invention, the nano aperture and the surface negative electricity functional group of the TOCN layer are utilized, so that physical blocking and electrostatic repulsion of polyiodide ions can be realized at the same time, and the shuttle effect is effectively inhibited; and the uniform pore channels can guide zinc ions to uniformly deposit and inhibit dendritic crystal growth. The diaphragm is green in raw material, simple in process and low in cost, and the cycle life and coulombic efficiency of the battery can be remarkably improved when the diaphragm is applied to the zinc-iodine battery.

The invention relates to the technical field of sound absorption materials, in particular to an aerogel and cork composite sound absorption material with a dual-scale pore structure and a preparation method. The preparation method of the aerogel-softwood composite sound absorption material with the double-scale pore structure comprises the following steps that softwood particles subjected to microwave treatment are placed in a SiO2 aerogel precursor solution to be subjected to vacuum impregnation treatment, then hydrolysis and condensation polymerization are conducted, a three-dimensional network structure is formed through crosslinking, freeze drying is conducted after water soaking, and the aerogel-softwood composite sound absorption material with the double-scale pore structure is obtained. SiO2 aerogel and cork composite particles are obtained; and spraying a polyurethane adhesive into the SiO2 aerogel and cork composite particles, and then carrying out hot press molding to obtain the aerogel and cork composite sound absorption material with the dual-scale pore structure. According to the preparation method, microwave treatment and dipping treatment are combined, so that the sound absorption performance of the prepared aerogel and cork composite sound absorption material with the double-scale pore structure is improved, and the problem that sound absorption is not facilitated due to the unique cell structure of cork is solved.

The present invention provides a method for preparing unbleached impregnated insulating paper, belonging to the technical field of insulating paper preparation. The method uses a mixture of unbleached softwood sulfate pulp and unbleached hardwood sulfate pulp as raw materials, adds a bulking agent, gelatinized cationic starch, and a wet strength agent, and adjusts the preparation process to produce unbleached impregnated insulating paper with high dry and wet strength and good liquid absorption properties.

The invention relates to a method for manufacturing SCK paper having a basis weight in the range of 50 to 100 g / m2, wherein an optimal combination of nonrecycled BCP, BCTMP and recycled pulp obtained from release liner supercalendered Kraft paper is used to adjust the properties of the fiber furnish. While the use of BCTMP enables a product having a higher bulk, the recycled pulp component, which has high compatibility with the paper manufacturing process, enables to balance the manufacturing process and reduce the dimensional changes and shrinkage of the formed SCK paper. The combined presence of the BCTMP and the recycled pulp component in the fiber furnish improves the water removal from the fibers during the SCK paper manufacturing, while the presence of non-recycled BCP produced from softwood improves the formation and runnability of the paper web on the paper machine. This enables to produce SCK paper with improved sustainability, wherein the density may be controlled by means of the fiber furnish, without downgauging and without adverse effects to other paper properties, which would prevent the use of the SCK paper as substrate layer in a release liner.

In a release paper consisting of a backing paper layer coated on at least one side with PVOH and a silicone coating on at least one side, in which the backing paper layer coated on at least one side with PVOH consists of bleached kraft paper, containing at least up to 30 wt. % softwood and hardwood with a total freeness between 30 °SR and 42 °SR, preferably between 33 °SR and 38 °SR, and processing aids, and also a release layer which is applied at least on one side to the PVOH-coated side of the backing paper layer and consists of 0.5 to 5 g / m2 of a silicone, and wherein the release paper coated at least on one side with PVOH and silicone has a density between 850 and 990 kg / m3, preferably between 900 and 970 kg / m3, and a method for producing a release paper.

The invention relates to the technical field of agricultural paper, in particular to double anti-mite fruit cultivating bag paper and a preparation method thereof. The preparation method comprises the following steps: pulping: respectively pulping natural-color bamboo pulp and natural-color softwood pulp, then mixing, adding water, and uniformly mixing to obtain pulp; papermaking: sequentially adding iron oxide yellow, aluminum sulfate, rosin size and a wet strength agent into the pulp, adding water for dilution, and drying after papermaking to obtain fruit cultivating bag body paper; sizing: taking oxidized cassava starch, adding water, preparing starch slurry, heating, continuously stirring until the starch is completely gelatinized, taking starch gelatinized liquid, adding neem oil, putting into a high-speed homogenizing emulsifying machine, emulsifying to obtain neem oil anti-mite emulsion, uniformly mixing the neem oil anti-mite emulsion with wax emulsion to obtain anti-mite glue liquid, immersing the fruit cultivating bag body paper into the anti-mite glue liquid, and drying to obtain the fruit cultivating bag. And taking out and drying to obtain the double anti-mite fruit cultivating bag paper. The composite material has physical barrier and long-acting anti-mite functions, and the risk of insect attack invasion is greatly reduced.

The invention provides high-humidity base paper and a quantifiable preparation process thereof, and relates to the field of paper production and processing. Comprising the following raw materials in percentage by mass: 15%-25% of softwood pulp, 40%-55% of hardwood pulp, 10%-25% of soft fibers, 10%-20% of nanocellulose, 0.5%-1.5% of vegetable fat polymer composite microspheres and 1%-3% of functional aids, wherein the solid content of aqueous suspension of the softwood pulp and the hardwood pulp is 3%-8%; the nano cellulose is subjected to surface modification treatment. According to the paper, coniferous wood pulp long fibers, hardwood pulp short fibers and soft fibers are utilized to form a three-dimensional framework, nano-crystalline cellulose enhances wet load transmission through a nanoscale bridging network, vegetable fat microspheres construct a hydrophobic layer to inhibit moisture permeation, the three components have a synergistic effect, so that the wet tensile strength is improved, and meanwhile, high air permeability is kept; and the balance of water resistance and ventilation is realized.

The present disclosure relates to a machine glazed paper comprising softwood fibers, the machine glazed paper comprising starch to an amount within the range of from 0.1 wt. % by weight to 2 wt. % of the dry weight of the machine glazed paper. the amount of softwood fibers of the total amount of fibers being 63 wt. % or more, and the machine glazed paper having a Cobb value within the range of from 20 gsm to 50 gsm. as measured according to the standard method ISO 535:2014. The present disclosure furthermore relates to a method of producing the machine glazed paper.

Systems and methods are described for fiber-based, plastic-free products for storage of emulsion food products. In some embodiments, a coating is applied to the product, such as a coating comprising efficacious proportions of xylitol, citric acid, water, microfibrillated cellulose, and polyvinyl alcohol. A slurry is used to fabricate the product includes various proportions of fiber blends (e.g., combinations of bleached softwood, bleached hardwood, kraft paper, and / or virgin fiber), AKD, starch, a stearate (e.g., Magnesium or Calcium Stearate), a defoamer, and microfibrillated cellulose.

The invention provides a preparation method of environment-friendly straw paper with hydrophobic and lip-sticking-free properties. The preparation method comprises the following steps: respectively pulping bleached softwood pulp and bleached hardwood pulp, and mixing to obtain a fiber mixture; adding a biological wax waterproof system sizing agent into the fiber mixture, or adding the biological wax waterproof system sizing agent and an antibacterial agent, and adding a wet strength agent and an alkyl ketene dimer, and carrying out net forming treatment; the preparation method comprises the following steps: carrying out squeezing dehydration and primary drying treatment on paper pulp subjected to net forming treatment, carrying out surface coating and sizing by adopting a sizing system containing a biological wax waterproof system sizing agent, carrying out secondary drying treatment, and finally sequentially carrying out calendering and coiling to obtain the environment-friendly straw paper. Experiments show that the straw paper disclosed by the invention has the advantages of excellent hydrophobicity, no lip sticking, high strength, high antibacterial property, complete degradability, no toxicity and environment friendliness.

The present invention relates to a glass paper for stripping interleaving paper, wherein the majority of the fiber ingredients are non-regenerated bleached chemical pulp from hardwood such as birch or eucalyptus. A small amount of recycled pulp produced from release liner glass paper and / or pulp mill broke is used to adjust the characteristics of the fiber ingredients. The invention makes it possible to produce cellophane, wherein the fibrous ingredients do not contain non-recycled chemical pulp produced from cork.

The invention relates to the field of paper for aluminum electrolytic capacitors, and discloses a preparation method of a high-voltage low-internal-resistance electrolytic capacitor diaphragm. The whole diaphragm is prepared from high-beating-degree and high-purity insulating softwood pulp, so that high unit thickness voltage resistance can be ensured. The adopted preparation method is a continuous drying mode, the drying efficiency is higher than that of a gap drying mode, after fibers are formed and dried through a fourdrinier wire, the surface of a paper web is treated in a spraying mode, then freezing and reduced-pressure drying are adopted, a large number of fine pore structures are given to the surface of the diaphragm, and the high voltage resistance of the diaphragm is reserved; and the adsorption speed and the adsorption capacity of the diaphragm on electrolyte can be effectively improved, so that the internal resistance of the diaphragm is reduced.

The invention relates to the technical field of softwood cutting devices, and particularly discloses a softwood sheet bending piece positioning and fitting cutting device which comprises supporting legs, symmetrical workbenches are fixedly mounted on the upper end faces of the supporting legs, and vertical rods are fixedly mounted at the corners of the outer sides of the upper end faces of the workbenches. A mounting plate is fixedly mounted at the upper ends of the vertical rods; the U-shaped supporting plate fixed to the workbench can be precisely matched with the cambered surface of the cork bending piece, the air pipe and the circumferential air holes in the U-shaped supporting plate can be matched with the air path system to form negative pressure adsorption, and the cork thin plate is tightly attached to the inner side of the U-shaped supporting plate. And the negative pressure can uniformly act on the bending surface, so that local displacement is prevented, and the positioning and laminating precision error is controlled within an extremely small range.

The preparation method of the environment-friendly anti-aging packaging base paper comprises the following steps: taking softwood pulp and dissolving pulp, pulping for the first time, adding microcrystalline cellulose, and stirring to form first pulp; adjusting the pH value of the first slurry to be neutral, adding a water-soluble chitosan-polyphenol compound, and pulping for the second time to form second slurry; adding oxidized sodium alginate into the second pulp, and pulping for the third time to form third pulp; forming raw paper according to a papermaking process; the invention further provides packaging base paper which has the characteristic of good anti-aging performance. Softwood pulp and dissolving pulp are used as papermaking raw materials, microcrystalline cellulose, a water-soluble chitosan-polyphenol compound and oxidized sodium alginate are used, a pulping process which is sequentially added according to a sequence is formed, a stable fiber network is constructed layer by layer, and a mechanism of skeleton supporting, covalent crosslinking and antioxidant end capping is formed. The anti-aging performance of the raw paper is improved.

The invention relates to the technical field of manufacturing of coated paperboards, in particular to frame paper for cigarettes and a preparation process of the frame paper. The problem that the mechanical property and the barrier property cannot be considered at the same time in the prior art is solved. According to the frame paper for the cigarettes, the bleached hardwood pulp and the softwood pulp are compounded, and the calcium carbonate and the nanocellulose crystals are added to prepare the high-uniformity modified paper base; then, polycaprolactone diol, isophorone diisocyanate, dimethylolpropionic acid and 1, 4-butanediol are subjected to a reaction, aminopropyltriethoxysilane is used for blocking, obtained polyurethane emulsion is mixed with gelatinized starch and flaky kaolin step by step, and the composite coating is prepared; coating double surfaces of the modified paper base with the composite coating, and performing step-by-step drying, hot-pressing shaping and curing to obtain the paper. Through multi-stage cooperation of paper base-coating-process, the frame paper has excellent mechanical properties, high printing stability and high barrier property, and is suitable for the field of high-grade cigarette packaging with strict performance requirements.

The invention relates to the technical field of battery diaphragms, in particular to a wood fiber composite diaphragm and a preparation method thereof. According to the diaphragm, renewable softwood pulp is used as a basic raw material, after aldehyde groups are introduced through sodium periodate oxidation, tannic acid, zinc acetate and cystamine are utilized to synergistically construct a zinc coordination network functional layer; then, molecular crosslinking with methoxypolyethylene glycol, polyethylene glycol, hexamethylene diisocyanate, gamma-aminopropyltriethoxysilane and nano silicon dioxide is realized under the action of a catalyst; and finally, the paper-making and hot-pressing processes are performed to prepare and mold. The diaphragm is particularly suitable for being applied to high-safety and high-performance aqueous metal zinc batteries, and an innovative technical path is provided for industrialization and green upgrading of zinc ion battery diaphragm materials.

The invention discloses a preparation method of baking paper, and relates to the technical field of papermaking industry. According to the invention, the acidic bisulfite softwood pulp is used as a raw material, and the paper is endowed with an oil-proof characteristic through high-beating treatment, so that not only can potential harm to a human body caused by the use of an oil-proof agent in the baking paper be avoided, but also the problem of high energy consumption caused by high-beating-degree papermaking of the softwood pulp by a sulfate method in the prior art is solved.

The invention discloses an automobile ornament softwood surface coating, a preparation method and application, and relates to the technical field of automobile coatings, the automobile ornament softwood surface coating comprises the following specific components: a primer, a brush-off layer, a seal paint and a finish paint. Aiming at the structural defects and practical application requirements of the cork material, a multifunctional synergistic system of primer, brush-off layer, seal paint and finish paint is constructed; the nano flake mica and the nano montmorillonite form a labyrinth type water-blocking structure in the primer, the hyperbranched polyester and the nano cellulose construct a stable color wiping and developing system, and the organic silicon sealing layer is compounded with the hollow microbeads and the nano zinc oxide to realize light-weight heat insulation protection. And nano aluminum oxide and fluorine modified wax powder in the finish paint jointly enhance the wear resistance and scratch resistance of the surface, so that the overall weather resistance, adhesive force, damp heat resistance, aging resistance and mechanical stability of the cork are effectively improved on the premise of not sacrificing the natural touch of the cork. And a complete set of technical support and an industrialization foundation are provided for large-scale application of the cork material in automobile high-end ornaments.

The invention discloses a production method for reducing the proportion of long fibers of cream base paper, and belongs to the field of papermaking. The main technical scheme is as follows: raw materials comprise long fibers (one or more of cotton pulp, softwood pulp and bamboo pulp which are subjected to repulping and are ground by two serially connected disc mills until the beating degree is 25-35 degrees SR and the wet weight is 8.0-13.0 g), short fibers (hardwood pulp which is subjected to repulping and defibering and the beating degree is 15-20 degrees SR) and broken paper (subjected to repulping and defibering); adjusting the flow, mixing the three components according to the mass ratio of (8-20): (85-70): (15-0) in a pulp preparation pool, and uniformly grinding until the beating degree is 25-45 degrees SR; the white water reflux quantity is regulated and controlled in the process. And after the slurry is formed by a high-speed paper machine, wrinkling by using a ceramic or carbon steel scraper under the dryness of 55-85% at the wrinkling rate of 18-25%, and coiling and slitting to obtain the cream base paper. The quantification of the raw paper is 10-20g / m < 2 >, and the transverse dry tensile index is gt; 3.0 N.m / g, and the longitudinal wet tensile index gt; 3.0 N.m / g, and the softness lt; the bulk is gt; 6.60 m < 3 > / g, and the transverse liquid absorption height gt; and 75 mm / (100s). The process is optimized, the use amount of long fibers is remarkably reduced, meanwhile, it is ensured that the cream base paper has excellent strength and bearing performance, and the cost is remarkably reduced.

The utility model discloses a kind of transfer devices for cork furniture, belong to furniture transport technical field.It includes vehicle plate, handle and universal wheel.Vehicle plate below installs universal wheel and is convenient for moving, above welding handle, two slide rails are installed on vehicle plate, and circular limit block with roller inclined rail is correspondingly set in one end of slide rail.Adjusting assembly is rotated by hand wheel drive screw column, drive screw block and bearing connection slider connecting column lateral movement of it, core effect is to pull fixed plate and its connecting roller from roller inclined rail to slide rail, realize accurate positioning and transport of furniture on device.Rope automatic recovery assembly is automatically recovered by clock spring drive reel, in combination with ratchet and pawl anti-loosening mechanism and guide rope board, cooperate with rope binding column to realize furniture fast binding and fixing.Solve the problem that furniture is laborious in traditional transfer, fixed operation is complicated, with loading positioning accurate, binding convenient and the like advantages, significantly improve the safety and efficiency of cork furniture transfer.

The present application belongs to the technical field of composite materials, and particularly relates to a plant fiber molded composite material, a preparation method thereof and an integrated system. The present application utilizes softwood to perform softwood pitch leaching-plant fiber modification-softwood pitch plastic extrusion integrated process, directly performs surface modification on the plant fiber by using the softwood pitch leaching liquor, reduces the surface polarity of the plant fiber and improves the performance of the composite material. The present application reduces the modification cost in the forming process of the plant fiber molded composite material while utilizing waste, and further crosslinks and extrudes to form softwood pitch plastic after concentrating the softwood pitch leaching liquor to prepare softwood pitch, so as to coat, strengthen and protect the plant fiber molded core material, prepare high-strength and high-stability full-green plant molded material, and provide technical support for the development of the softwood and plant fiber industry.

The application discloses a strength-heat preservation-decoration integrated laminated structure wood composite material and a preparation method thereof, and comprises at least two pieces of outer layer materials and an intermediate layer; the outer layer material is wood containing nanocellulose and water-based resin; and the intermediate layer is a blend of cork particles and polylactic acid. The nanocellulose and the water-based resin are dissolved in an alkaline solution to obtain a mixed solution, the mixed solution is treated by impregnation into the wood, and the outer layer material is obtained after hot pressing; the cork particles and the polylactic acid are blended and hot-pressed to obtain the intermediate layer; the two pieces of outer layer materials and the piece of intermediate layer are cold-pressed and glued together to obtain a three-layer composite material of outer layer material-intermediate layer-outer layer material; and a customized pattern is directly printed on the surface of the three-layer composite material by using a digital jet printing technology, so that the strength-heat preservation-decoration integrated laminated structure wood composite material is prepared. The application solves the problem of lack of multifunctional integrated wood materials in fabricated wood structure buildings.

The invention discloses a preparation method of coated gift packaging paper. The preparation method comprises the following operation steps: S1, pulping: respectively pulping bleached sulfate softwood chemical pulp, bleached sulfate broadleaf wood chemical pulp and alkaline hydrogen peroxide bleached poplar chemimechanical pulp, and mixing to form mixed pulp; s2, auxiliary material adding, wet paper sheet forming and pre-drying; s3, coating and sizing are conducted, specifically, the front face and the back face of the paper sheet are coated with a coating respectively, and the coating comprises coating-grade light calcium carbonate, coating-grade talcum powder, a dispersing agent, sodium hydroxide, modified acrylic copolymer emulsion, polyvinyl acetate latex, coating starch, sodium carboxyl cellulose, a lubricating agent and a defoaming agent; s4, carrying out post-drying and carrying out super-soft calendering treatment by adopting eight rollers and seven pressing areas; the invention also provides the coated gift packaging paper prepared by adopting the preparation method, the smoothness of the coated gift packaging paper is greater than 1200s, the roughness of the coated gift packaging paper is less than 1.2 microns, and the coated gift packaging paper completely meets the requirements of the coated gift packaging paper for absorbing and drying gravure or flexographic printing water-based ink.

An insulating radiant barrier sheathing product formed by directly bonding or applying an insulating radiant barrier (IRB) material to the interior surface (i.e., facing the attic or other interior space) of a wood, wood-based, manufactured wood, or cellulosic panel or structural or sheathing panel. The IRB panel product may be used as a roof sheathing panel, with one or more outer protective and finishing layers applied to the outer surface, such as, but not limited to, an underlayment and roofing shingles. The IRB material may comprise a mixture of a radiant barrier (RB) paint and a granulated insulating material. The granulated insulating material may comprise cork, EPS, XPS, poly-iso, other similar insulating material, or combinations thereof. Alternatively, the IRB material may comprise a reflecting bubble-wrap layer.

The present invention is directed to a film or coating comprising a fiber material, wherein at least 60% by weight of said fiber material is microfibrillated cellulose, said film or coating also comprising at least 1% by weight of extractives from wood bark or cork wood. The invention is also directed to products, such as packaging materials, using or incorporating said film or coating. Such packaging materials are for example laminates or multi-layer structures. The films or coatings according to the present invention having advantageous barrier properties and are therefore particularly suitable for sensitive objects that need to be packaged in a controlled or modified atmosphere. The present invention is also directed to a composition comprising a fiber material, wherein at least 60% by weight of said fiber material is microfibrillated cellulose, said composition also comprising at least 1% by weight of extractives from wood bark or cork wood. The composition is useful for example in the preparation of the film or coating.