547 results about "Putty" patented technology

The utility model provides a putty stirring and grinding integrated moving trolley suitable for a spraying robot. The putty stirring and grinding integrated moving trolley comprises a chassis, a stirring machine, a liquid pump and a grinding machine. The chassis is used for fixing the stirrer, the infusion pump and the grinding machine; the chassis comprises a chassis frame, a first containing cavity and a second containing cavity are formed in the chassis frame, the stirring machine is located in the first containing cavity, and the grinding machine is located in the second containing cavity. One end of the infusion pump is provided with a feeding port, the other end of the infusion pump is provided with a discharging port, one end of the infusion pump extends into the stirring machine, and the other end of the infusion pump is fixed to the chassis frame, can be communicated with the grinding machine and is used for conveying materials in the stirring machine into the grinding machine. According to the invention, stirred materials can be directly pumped out of the charging barrel and conveyed into the charging barrel of the grinding machine through the infusion pump, and meanwhile, the materials can be discharged or continuously stirred through the three-way valve in the grinding machine; and the quick connector arranged at the bottom of the charging barrel can be connected with a valve or a material pipe, so that fixed-point discharge of materials can be realized, and a clean and tidy use environment can be ensured.

The invention provides a high-precision assembly type outer wall transparent seam coating construction method which comprises the following steps: S1, base surface treatment: cleaning the surface of an outer wall, removing loose, peeled, hollow and pulverized base surfaces, and removing dust and oil stains; and S2, alkali-resisting glass fiber gridding cloth is laid, anti-crack mortar is scraped on the surface of the base layer in batches, and then the gridding cloth is pressed into the anti-crack mortar. Before blade coating of the coating, the alkali-resisting glass fiber gridding cloth is matched with the anti-crack mortar, so that the anti-falling performance of the anti-crack mortar is enhanced, leveling of the surface of the outer wall is achieved, and follow-up coating spraying is facilitated; in addition, the construction steps of the coating are improved, the sequence of structural joint gluing is adjusted, and structural joint gluing is performed after the first time of flexible waterproof putty blade coating, so that the flatness of the wall surface is ensured, and the forming quality of the outer wall coating is improved.

The invention discloses a production process parameter management system and method and a putty powder coarse primer preparation method, and relates to the field of parameter management.The historical production data is converted into a reusable process knowledge base, the quality risk under different parameter combinations can be accurately predicted through an established defective rate mapping model, and the production process parameter management efficiency is improved. The resource waste caused by the traditional trial and error method is obviously reduced; microcosmic differences of material components are captured through high-precision spectral analysis, surface defects are rapidly positioned by combining an image processing technology, and finally millisecond-level automatic sorting of certified products and defective products is achieved. Not only is the misjudgment problem of a single detection means solved, but also the detection model can be reversely optimized through continuously accumulated sample data; when a novel raw material or formula is changed, the system can rapidly migrate historical learning experience, the dynamic adaptation of a quality control standard is ensured, and finally, the production mode change from passive quality inspection to active prevention and from experience driving to data driving is realized.

The invention relates to the technical field of composite material engineering, and discloses a method for manufacturing a foam female die of an airplane model, which comprises the following steps: firstly, carrying out gradient grinding on the inner surface of the foam female die; filling the polished foam female die with an epoxy material and a putty material, and polishing again; the polished foam female die filled with the epoxy material and the putty material is coated with a microcrystalline wax sealing layer, and a solvent type release agent is sprayed; and carrying out a wet lamination process on the foam female die filled with the epoxy material and the putty material. A traditional mold is replaced with the corrodible modified foam female mold, so that the single-piece mold manufacturing cost is reduced, the period is shortened, the complex machining process of the traditional mold is not needed, the material cost is low, the manufacturing steps are simple and convenient, manpower and time investment is greatly reduced, the method is particularly suitable for small-batch customized production, and economic benefits are improved.

The invention discloses a polymer modified exterior wall putty manufacturing process and a product. The polymer modified exterior wall putty manufacturing process comprises the following steps: preparing the following components in parts by weight: 40-60 parts of an inorganic cementing material, 30-50 parts of aggregate, 2-8 parts of a polymer modifier, 0.1-0.5 part of cellulose ether, 0.5-2 parts of a waterproof agent and 0-5 parts of a functional additive; the inorganic cementing material and the aggregate are put into a mixing machine for dry mixing; and adding the polymer modifier, the cellulose ether, the waterproof agent and the functional additive, and uniformly mixing.

1. The name of the design product: loading shovel. 2. The use of the design product: for scraping putty, loading shovel hand tools. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: front view.

The utility model discloses a putty flexibility detection device, and the putty flexibility detection device is provided with a plurality of groups of support plates and shaft bodies, and the support plates and the shaft bodies are connected through folding assemblies, and the folding assemblies can drive the support plates to move along the radial direction of the shaft bodies, and the opening end of the U-shaped frame is rotatably arranged on the shaft body, and a roller is movably arranged in the U-shaped frame through a first displacement assembly, and the roller can move along the length direction of the U-shaped frame, and the clamping block is slidably arranged on the top of the pedestal and connected with the pedestal through a second displacement assembly. Through the above arrangement, the bending radius of the test plate can be adjusted, and the application scenarios of the device are widened.

The application discloses a long-acting fragrance essential oil microcapsule veneer artificial board and a preparation method thereof, and comprises a core board, both sides of the core board are provided with surface layer single boards with holes, the surface of the surface layer single boards with holes is sequentially provided with a surface layer thin single board and an impregnated glue film paper; a plurality of waist-shaped through holes are arranged on the surface layer single boards with holes, and the waist-shaped through holes are filled with essential oil microcapsule composite fillers; the essential oil microcapsule composite fillers comprise essential oil microcapsules, putty powder, wood fibers and melamine urea-formaldehyde resin glue; and the essential oil microcapsules comprise single-layer coated microcapsules and double-layer coated microcapsules. The essential oil microcapsules are carried by means of the waist-shaped holes arranged on the surface layer single boards, so that the problem that the adding amount of the microcapsules cannot be improved is solved; and the single-layer and multi-layer microcapsules are simultaneously added, so that the damage of the temperature and pressure in the hot-pressing forming process to the microcapsules is avoided, the long-acting and slow-releasing effect of the fragrance can be realized, and the doped odor generated by the VOC release of the board itself is inhibited.

The utility model discloses an environment-friendly putty powder mixing device, relates to the technical field of putty powder mixing, and solves the problems that when an existing putty powder mixing device is used, putty powder is mixed and stirred by adopting a single stirring shaft and a stirring rod, and the stirring shaft rotates unidirectionally in the stirring process, so that the stirring efficiency is high. The putty powder mixing device comprises a box body, the box body is of a cylindrical structure, a circular opening is formed in the side wall face of the box body, a rotating disc is rotationally installed in the circular opening, and one side of the rotating disc is located in the box body and fixedly provided with a shaft rod. Through cooperation of the driving assembly and the stirring assembly, the two stirring rods stir the materials in the stirring barrel at the same time, and then putty powder is turned and stirred by the stirring plate while being turned and stirred by the stirring assembly, so that the putty powder is fully mixed.

The utility model belongs to the technical field of dust removal devices, and particularly discloses a workshop dust removal system for putty powder production, which comprises a dust removal box, a main fan and a plurality of dust collectors, the dust collectors are arranged below the side wall of a workshop, the dust inlet surfaces of the dust collectors are obliquely arranged, and an electrostatic dust removal plate is fixedly connected in the dust removal box. Electric modules are fixedly connected to the top of the dust removal box on the two sides of the electrostatic dust removal plate, cleaning motors are fixedly connected to moving terminals of the electric modules, cleaning rolling brushes are fixedly connected to rotating shafts of the cleaning motors, an air inlet end and an air outlet end are arranged at the left end and the right end of the dust removal box respectively, a discharging pipe is arranged at the bottom of the dust removal box, and the bottom of the discharging pipe communicates with a collecting box. The inclined dust collector is arranged on the lower portion of the workshop and is suitable for collecting dust in the workshop, the electrostatic dust collection plate is arranged in the dust collection box, the dust can be well collected and treated, the cleaning rolling brush is arranged, and the dust adsorbed on the electrostatic dust collection plate can be collected through the rolling brush.

The utility model relates to the field of scrapers, and discloses a putty painting scraper which comprises a fixing rod and a scraper, the lower end of the fixing rod is fixedly connected with a bottom plate, the rear end of the upper surface of the bottom plate is fixedly connected with a mounting plate, a sliding groove is formed in the rear portion of the upper surface of the scraper, and clamping grooves are formed in the two sides of the front end of the inner wall of the sliding groove. Limiting grooves are formed in the two sides of the front end of the outer wall of the bottom plate. According to the scraping plate for putty painting, the sliding groove is designed in the scraper, the clamping groove is formed in the sliding groove, the clamping block is arranged on the bottom plate and connected with the first spring in the limiting groove, it is guaranteed that the clamping block can be tightly attached to the inner wall of the limiting groove, an operator only needs to pull the pulling pieces on the two sides to enable the clamping block to be tightly attached to the inner wall of the limiting groove, and the clamping block can be tightly attached to the inner wall of the limiting groove; and then the bottom plate is pushed to slide in the sliding groove, when the bottom plate reaches a designated position, the clamping block can automatically pop out and be tightly attached to the clamping groove, and the firm limiting effect is achieved.

The present application relates to the technical field of building materials, and specifically discloses a water-resistant putty powder for interior walls and a preparation method thereof. A water-resistant putty powder for interior walls, the raw materials of which include: sulphoaluminate cement, nano-heavy calcium powder, silica fume, double MOF composite nanotubes, modified diatomaceous earth, polypropylene fiber, nano-titanium dioxide, defoaming agent, dispersant and mildew inhibitor. The double MOF composite nanotubes are obtained by loading copper trimesic acid in the inner cavity of halloysite nanotubes and loading dimethylimidazole cobalt on the outer wall; the modified diatomaceous earth is obtained by modifying diatomaceous earth with stearic acid. The water-resistant putty powder for interior walls of the present application uses double MOF composite nanotubes as the core functional material, and under the synergistic effect of multiple components, it effectively enhances the water resistance and air permeability of the putty layer.

The utility model relates to the technical field of building decoration, and discloses an anti-crack suspended ceiling structure which comprises a main keel. According to the anti-cracking suspended ceiling structure, when a suspended ceiling is mounted, the supporting rods, the connecting rods and the mounting plate are arranged, the mounting plate is mounted in the center of the suspended ceiling plate, the contact area between the suspended ceiling and a keel can be increased, and the suspended ceiling can be effectively prevented from deforming and cracking after being used for a long time; after a suspended ceiling is installed, the joint of the two calcium silicate boards is coated with the first water-resistant putty layer, the second water-resistant putty layer is embedded after putty is dried, the flexible putty layer is embedded after putty is dried, the first polyurea waterproof coating and the second polyurea waterproof coating are coated after putty is dried, and then the glass fiber net is installed on the polyurea waterproof coatings; and finally, after the coating is dried, the ceiling board begins to be subjected to large-area puttying and finish coating brushing, through arrangement of multiple coatings, the moisture resistance and deformation resistance of the anti-cracking ceiling structure are improved, and meanwhile cracking can be effectively prevented.

The utility model discloses a gypsum putty powder adhesive force detection device which comprises a base, a fixing mechanism is arranged on the base, and an extrusion detection mechanism and a knocking detection mechanism are arranged on the base and located above the fixing mechanism. The extrusion detection mechanism comprises an air cylinder, a supporting frame and a pressing block, the supporting frame is fixed to the base, the air cylinder is fixed to the top of the supporting frame, a first pressure sensor is installed at the movable end of the bottom of the air cylinder, and the pressing block is fixedly installed on the lower pressure sensor. The utility model belongs to the technical field of gypsum putty powder detection, and particularly relates to a gypsum putty powder adhesive force detection device.

1. The name of the design product: toothpaste toy. 2. The use of the design product: for entertainment and play. 3. The design features of the design product: in shape. 4. The picture or photo that best shows the design features: perspective view 1.

The application relates to the technical field of putty powder production equipment, and discloses a screening device, which comprises a screening shell, a discharge pipe arranged on the side wall of the screening shell, a discharging piece detachably connected to the discharge pipe, a connecting assembly for connecting the discharging piece and the discharge pipe, a connecting ring arranged on the outer wall of the discharge pipe, a first ring body sleeved on the outer wall of the discharge pipe, a second ring body and a positioning piece for connecting the second ring body to the connecting ring, the first ring body being located in the inner cavity of the second ring body, the second ring body being provided with an abutting edge for abutting against the lower end of the first ring body, and the upper end of the discharging piece penetrating through the first ring body and being clamped between the first ring body and the second ring body. The application has the effects of stable connection and convenient disassembly.

1. Name of the product in this design: Multifunctional Adjustable Putty Box. 2. Purpose of this design: A tool for applying putty powder. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design points: 3D diagram of the combined state 2. 5. This design is for a thin product, so the left and right views of component 3 are omitted; this design is for a thin product, so the top and bottom views of component 3 are omitted. 6. Other situations requiring explanation: Component 1 is the handle of the ash box, component 2 is the main body of the ash box, and component 3 is the baffle for adjusting the ash discharge size of the ash box.

The utility model relates to the field of expansion rubber blocks, and particularly discloses a high-foaming expansion rubber block for an automobile, which comprises a framework layer and a foaming layer, a boss is arranged on the end face of the side, facing the foaming layer, of the framework layer. A barb structure is arranged on the side face of the boss. The foaming layer is provided with grooves corresponding to the bosses, and the barb structures are embedded into the foaming layer. Convex-concave mortise and tenon joint splicing structures are arranged at the two ends of the framework layer, and a positioning pin and a magnetic attraction structure are integrated on the side, facing the automobile body metal plate, of the framework layer so that the framework layer can be fixed to the automobile body metal plate. And through the composite structural design of the framework layer and the foaming layer, mortise and tenon joint splicing and magnetic attraction fixing are combined, and the installation stability and the anti-seismic property of the rubber block can be effectively improved.

The application belongs to the technical field of coatings, and particularly relates to a putty based on ultraviolet light curing resin and a preparation method and application thereof. The putty based on ultraviolet light curing resin comprises, by mass fraction, 30-50 parts of ultraviolet light curing resin, 25-45 parts of fillers, 3-6 parts of diluents, 3-6 parts of poly(methyl methacrylate-co-methyl methacrylate), and 0.05-1.5 parts of a photoinitiator. The ultraviolet light curing resin comprises a light curing unsaturated polyester resin and a polyester acrylate. The fillers comprise antioxidants / halloysite nanotubes / basalt fibers, nano calcium carbonate, and nano zirconium oxide. The putty based on ultraviolet light curing resin has good adhesion, flexibility, impact resistance, heat resistance, and high and low temperature resistance, and can be applied in the fields of automobile repair and furniture manufacturing.

The invention belongs to the technical field of building thermal insulation materials, and particularly relates to putty for external wall thermal insulation and a preparation method thereof. The method comprises the following steps: 1) preparing materials; (2) premixing the nano aerogel, the ceramic fiber, the calcium sulfate whisker, the basalt fiber and the calcium stearate according to a proportion after material preparation is completed, so as to prepare composite powder; 3) uniformly dry-mixing a cement-based cementing material, cellulose ether and a water reducing agent, and mixing with the composite powder to prepare a base material; 4) slowly adding water into the base material, and continuously stirring to prepare a precursor; and 5) performing dynamic pre-aging on the precursor, and crushing and grinding the precursor into the putty powder after dynamic pre-aging. Cracking is reduced through a curing agent-free design, and the construction safety is improved; the pre-aging process widens the adaptability of the construction environment, and the requirements on humidity and temperature are obviously reduced; the microstructure is uniform, the heat conductivity coefficient is low and the mechanical property is stable; the cost is controllable and the method is suitable for large-scale popularization and application.

According to the rapid testing method for the discoloration of the copper ion wall coating, the defects that in an existing discoloration test, the discoloration test period of the copper ion wall coating is long, and the discoloration is slow can be overcome, the discoloration of copper ions can be more obvious by arranging different test matrix partitions on a gypsum board and combining new special test putty, and the discoloration of the copper ions can be more uniform. Meanwhile, the oven heating drying is added, the reaction speed can be increased, and the test period is shortened. In addition, the equal transverse division parts are added in the optimization scheme, so that the color change condition of the copper ion wall coating on different base materials can be tested synchronously.

The invention discloses wide-temperature-range silicone rubber-based rubber for aerospace thermal protection, a composite material and a preparation method of the wide-temperature-range silicone rubber-based rubber. According to the invention, three monomers, i.e., methylcyclosiloxane, hexaethylcyclotrisiloxane and phenylene silicon monomer, are subjected to ring opening and condensation copolymerization to obtain polysiloxane macromolecules containing three different chain link structures. A phenylene structure is introduced into a silicon rubber main chain, so that the silicon elastomer main chain is limited to form a volatile cyclic oligomer through a chain back-biting reaction and a chain segment rearrangement exchange reaction, the thermal stability is improved, and the initial decomposition temperature is up to 450.16 DEG C; the regularity of a molecular chain is broken by introducing ethyl, so that the glass-transition temperature is as low as 120.2 DEG C, and no crystallization phenomenon occurs. The base adhesive has excellent cold resistance, radiation resistance, ablation resistance, high temperature resistance and the like, and can be used as the base adhesive to be applied to the aspects of aerospace craft protective coatings, dynamic seal putty adhesives, sealants and the like.

The application discloses a top putty construction mechanism and a construction method, belongs to the technical field of building robots, and an AGV chassis is fixed with a lifting mechanism, the side of the last stage mechanism of the lifting mechanism is fixed with a first horizontal transverse structure, the surface of the first horizontal transverse structure is slidably connected with a second horizontal transverse structure, the surface of the second horizontal transverse structure is slidably connected with a putty construction structure, the putty construction structure comprises a mounting frame slidably connected with the second horizontal transverse structure, the top of the mounting frame is provided with a wall surface self-adapting structure, the top of the wall surface self-adapting structure is fixed with a scraper module, the wall surface self-adapting structure is driven to rotate through a scraper rotary power module, and the mounting frame is also provided with a putty spraying module. When the product sprays the top putty, full coverage and dead angle-free spraying and scraping can be realized, the construction structure of the product is automatically operated, the working efficiency is high, and the construction quality is better.

The invention discloses a building outer wall renovation construction method. The method comprises the following steps: step 1, checking and treating an original ceramic tile wall surface; the original ceramic tile wall surface is comprehensively checked, hollow ceramic tiles and a loose base layer are removed, and protruding foreign matters and pollutants on the wall surface are cleaned; a vacant part formed after removal and cleaning is filled and leveled with polymer cement mortar; polishing the glaze layer of the ceramic tile by using a polishing machine to form a rough surface so as to enhance the binding power of subsequent materials; step 2, interface processing; 3, construction of a renovating putty layer; 4, anti-crack mortar construction and gridding cloth construction are conducted; and step 5, surface layer construction. According to the method, the original ceramic tile wall surface is subjected to polishing, interface treatment and direct coating construction, so that the operation of chiseling off ceramic tiles and mortar layers in a large area in the traditional'removing and remaking 'process is avoided, mechanical impact noise and vibration generated in the construction process are remarkably reduced, and the method is suitable for renovating construction of building outer walls in a use state; and the interference to the surrounding environment and the user is effectively reduced.

The present application relates to the field of paint coating, and discloses a paint coating method for multi-color rice cave stone decoration, which comprises the following steps: first, wall surface pretreatment, first, cleaning the wall surface, ensuring the base layer to be flat, using a scraper to evenly apply anti-cracking mortar on the wall surface, then applying paint putty to level, and then evenly brushing an environmental protection primer to form a primer layer; second, respectively mixing rice cave stone primer and rice cave stone fabric, applying a layer of rice cave stone primer on the treated base layer, then thinly applying a layer of rice cave stone fabric, and thinly applying a second layer of rice cave stone fabric after the first layer is dry; third, when the second layer of rice cave stone fabric is semi-dry, sliding a scraping tool on the surface of the fabric to form texture lines, and then using a painting tool to intermittently wipe the rice cave stone paint on the surface of the fabric; and fourth, finally, spraying a varnish to increase the gloss of the decorative effect and to protect the wall surface, so as to improve the decorative effect and simulation degree of the wall surface.

The present application relates to putty powder grinding technical field, particularly to a kind of grinding machine for putty powder production, including grinder body, abrasive structure and feeding mechanism, wherein, the feeding mechanism of the present application includes installation on grinder body, at least two primary grinding cavities formed on the feeding machine body, installation on the feeding machine body, and the heat exchange cavity formed in the feeding machine body and around primary grinding cavity setting is added to all;When the present application eliminates caked powder, first by the pretreatment of stirring structure in primary grinding cavity, then send into abrasive cavity, caked powder is stirred and preheated and decomposed into several small caked in primary grinding cavity, small caked is subsequently sent into abrasive cavity and further processed, the present application improves the efficiency of subsequent abrasive structure processing caked powder by the pretreatment of caked powder.

The invention relates to the technical field of building materials, in particular to flame-retardant putty powder and a preparation method thereof.The flame-retardant putty powder is prepared from, by weight, 70-80 parts of heavy calcium carbonate; 20 to 30 parts of ash calcium powder; 0.3 to 0.5 part of cellulose; 0.05 to 1 part of starch ether; and 0.5-2 parts of vinylidene chloride-based copolymer latex powder. According to the flame-retardant putty powder provided by the invention, through the synergistic effect of the vinylidene chloride-based copolymer latex powder and all the components, the performance is remarkably improved. Due to the addition of the vinylidene chloride-based copolymer latex powder, the putty powder provided by the invention has favorable flame retardancy, can achieve excellent water resistance under the condition of not adding a hydrophobic compound or a water repellent, and is simpler in formula, lower in cost and more environment-friendly.

The utility model discloses a wall surface slicking device for house construction engineering construction, and relates to the technical field of building engineering. The device structurally comprises a handheld scraping plate, a turnover pressing plate and an extrusion handle, the handheld scraping plate comprises a rectangular supporting plate; two fixed handles are fixed at the rear end of the rectangular supporting plate; the upper surfaces of the two ends of the rectangular supporting plate are each fixedly provided with a sector plate. One side, close to the fixed handle, of the lower end part of the fan-shaped plate is provided with a round through hole rotationally matched with the overturning pressing plate; and an extrusion handle is rotationally mounted on the fixed handle through a pin shaft. The handheld scraping plate covers a large width, a large amount of coating can be contained between the handheld scraping plate and the turnover pressing plate, large-area coating output and scraping operation can be achieved through one-time charging, and the efficiency of smearing and scraping putty on the wall face is greatly improved; force is applied to the holding handle of the extrusion handle through the finger hook, the roller extrudes the overturning pressing plate to push the coating to the front end of the rectangular supporting plate, continuous operation of discharging and slicking of the coating can be achieved by integrally moving upwards, and operation is easy and convenient.

The utility model discloses a casing which is good in positioning effect and convenient to assemble. Comprising a shell, mounting lugs symmetrically arranged on the two sides of the shell, mounting holes formed in the mounting lugs, a bearing hole formed in the shell, a mounting spigot formed in the shell, fixing holes formed in the mounting lugs, a plurality of positioning holes formed in the bottom of the shell and a heat dissipation boss arranged at the bottom of the shell. The positioning clamping groove mechanisms are arranged on the shell in a circumferential array mode, the positioning clamping groove mechanisms are fixedly installed on the shell, and the installation lugs are fixedly installed on the shell. The ECU protective cover has the advantages that the end cover is convenient to install, the effect is good, the ECU protective cover can be well installed through the positioning clamping groove mechanism, and heat dissipation mud smeared on the heat dissipation boss can well help an ECU chip to dissipate heat.

The invention provides a step-by-step modification preparation method of a low-agglomeration electromagnetic wave-absorbing putty composite material, and belongs to the technical field of electromagnetic wave-absorbing putty composite materials. The preparation method comprises the following steps: S1, dispersing a micron-sized magnetic filler in a solvent, and drying to obtain surface-modified magnetic powder, S2, dispersing a nano-carbon conductive material in a modifier solution containing a functional group to obtain a surface-modified conductive filler, and S3, adding the surface-modified conductive filler into an organic putty resin matrix, and uniformly dispersing under a three-roller grinding condition to obtain a composite material, and S4, coating the surface of a base material with the composite material to obtain the electromagnetic wave-absorbing putty composite material with a magnetic / electric dual-loss synergistic effect and an interface dissipation enhancement effect. The electromagnetic wave-absorbing putty material with low agglomeration and uniform dispersion is realized through step-by-step chemical modification of the magnetic and conductive filler, reasonable proportioning and a precise control process, has synergistic absorption of magnetic loss, dielectric loss and interface polarization, and is flat in performance, wide in frequency band and easy to prepare.