1435results about How to "Improve smell" patented technology

Methods and systems are disclosed for phototreatment in which replaceable containers comprising one or more adjuvant (consumable or re-useable) substances are employed. The adjuvant substance can be, for example, a topical substance or a coolant. Systems are disclosed for using a topical substance to detect contact of a phototreatment device with a tissue, detect speed of a phototreatment device over the tissue, detect regions of tissue that have been treated by a phototreatment device and / or to provide other benefits to the tissue such as improved skin tone and texture, tanning, etc. Safety systems are also disclosed that ensure that a proper consumable substance and / or container is connected to a phototreatment device and / or directed to a proper target. Additionally, cooling systems and methods that utilize phase change materials for extracting heat from a light generating device are disclosed.

The present invention relates to a formulation of herbal toothpowder or toothpaste for gums and teeth, which comprises of powder or paste of Zanthoxylum armatum (20-25%), Zingiber officinale (25-30%), Santalum album (8.25-8.5%), Spilanthes calva (2.0-2.5%), Pistacia lentiseus (2.0-2.5%), Quercus infectoria (8.0-8.5%), Usnea longissima (1-4%), as well as roasted alum and common salt.

The invention relates to a low-smell polypropylene composite material and a preparation method thereof. The low-smell polypropylene composite material comprises the following components in percentage by weight: 54 to 90 percent of polypropylene, 10 to 40 percent of talcpowder, 0.5 to 5 percent of plant fibers and 0.1 to 1.0 percent of heat stabilizer disteaxyl thiodipropionate (DSTP). The preparation method comprises the following steps of: weighing the raw materials in a weight ratio; performing dry mixing in a high-speed mixer for 3 to 5 minutes; and putting the mixed raw materials into a twin-screw machine, and melting, extruding and granulating to prepare granules of the polypropylene composite material. The polypropylene composite material has a simple preparation process, is low in cost, good in smell, low in organic volatile matter content and high in other fundamental characteristics such as mechanical properties and thermal oxidization stability.

The invention relates to a making method and an eating method for four hot pot taste seasonings. The making method comprises the following steps of: decocting spices such as gromwell, round cardamom fruit, tsaoko amomum fruit, resurrection lily, clove, amomum fruit, nutmeg, hawthorn, allspice, cumin, cinnamon, liquorice, fenugreek lysimachia, dahurian angelica root, jasmine, lysimachia sikokiana, nard, tangerine peel, Indian long pepper, anise, myrcia, Mongolian thyme herb, cyperus rotundus, fructus amomi rotundus, purple perilla, costustoot, fennel, grosvener siraitia, galangal and lemon grass, and ingredients such as beef tallow, colleseed oil, Pixian spicy bean, fermented soya beans, cooking wine, chili like the magnetic defang, dry pod pepper, ginger, garlic, green Chinese onion, pepper, black pepper, crystal sugar, white sugar, chicken powder, aginomoto, salt, fresh soup and fermented glutinous rice according to a proportion to prepare a special hot spot material, and respectively extracting. The hot pot taste seasonings are suitable for cooking methods such as stir-frying, frying, mixing, steaming, simmering, dipping, stewing, and stewing in soy sauce. The eating method is the same as that of soup-free hot spot dishes; and the hot pot taste seasonings are convenient to use, namely a proper amount of seasoning is added when dishes are cooked, and a mode of scalding in soup in the traditional hot spot is not needed.

Methods and systems are disclosed for phototreatment in which replaceable containers comprising one or more adjuvant (consumable or re-useable) substances are employed. The adjuvant substance can be, for example, a topical substance or a coolant. Systems are disclosed for using a topical substance to detect contact of a phototreatment device with a tissue, detect speed of a phototreatment device over the tissue, detect regions of tissue that have been treated by a phototreatment device and / or to provide other benefits to the tissue such as improved skin tone and texture, tanning, etc. Safety systems are also disclosed that ensure that a proper consumable substance and / or container is connected to a phototreatment device and / or directed to a proper target. Additionally, cooling systems and methods that utilize phase change materials for extracting heat from a light generating device are disclosed.

The invention relates to a preparation method for low-density viscoelastic polyurethane foam. Based on 100 parts by weight of mixed polyether, Isocyanate reaction active ingredients include (biii) 70-95 percent of propylene epoxide, ethylene oxide copolymerized polyol or a compound thereof, wherein the oxygen ethylidene unit content is not less than 70 percent by weight, (biii) 5-30 percent of propylene epoxide, epoxy ethane copolymerized polyol or a compound thereof, wherein the oxygen ethylidene unit content is 20 percent by weight at most, and (biv) 0-15 percent of propylene epoxide, propylene epoxide copolymerized polyol or a compound thereof, wherein the oxygen ethylidene unit content is 20 percent by weight at most; a reaction system does not contain any toluene diisocynate component or foaming agents except water; at least two polyether polyols are taken as major polyethers; and low-density viscoelastic polyurethane foam with low odor and excellent fatigue resistance is prepared.

The invention belongs to the field of smokeless tobaccos, and particularly relates to a bagged snus and a manufacturing method thereof. The bagged snus comprises, by weight, 1-20% of sweetening agents, 0.5-5% of acidifying or alkalizing agents, 0.5-5% of corrigent, 0.5-5% of flavoring agents, 0.2-3% of humectant, 0.01-1% of antioxidant, 0.01-1% of preservative, and the balance tobacco granular materials. The moisture content of the mixture is 20-60%. Moisturizing and / or aromatic flavoring treatment or treatment through a salivary secretion promotion agent is conducted on the surface of a packaging bag. By means of the bagged snus and the manufacturing method thereof, the apparent property of the bagged snus is improved, meanwhile, the taste comfort of the bagged snus is improved, salivary secretion is promoted, the bagged snus is made to be more suitable for the consumption habits of Chinese consumers, the special fragrance feature is endowed to bagged snus products from inside to outside, and the purpose of being tasty at the moment the snus products enter mouths is truly achieved.

The invention relates to a hand-care disposable disinfection gel and a preparation method thereof. The hand-care disposable disinfection gel comprises ethanol, a bactericide, a cosolvent, a thickener, an emollient, essence and a PH regulator, wherein the essence is used as a carrier to cover pungent odor of ethanol. The hand-care disposable disinfection gel has the advantages of being bactericidal, washing-free, not sticky and greasy, and comfortable in smell, and caring hands. The preparation method comprises the following steps: the thickener swells in purified water fully to prepare a liquid A; meanwhile, the bactericide and the cosolvent are added in ethanol to be mixed uniformly to prepare a liquid B; then, the liquid B is poured into the liquid A; the emollient and the essence are poured in the liquid A, after purified water is supplemented to be sufficient, the PH regulator is added to regulate the PH value to 6.0-8.0, and the uniform mixing is performed.

The invention discloses a chicken manure fermentation organic fertilizer, which is prepared from the following raw materials: chicken manure, straw powders, konjak flour, corn flour, cellulose, zeolite, humic acid, potassium dihydrogen phosphate, urea, peat soil, a leavening agent, a soil improvement agent, a film coating agent, potassium sulfate, borax and calcium superphosphate. The above raw materials are subjected to the integrated treatment of anaerobic fermentation and aerobic fermentation, so that the organic fertilizer is prepared through the fermentation of the chicken manure. The chicken manure fermentation organic fertilizer is complete in fermentation effect, and is capable of killing plant pathogenic bacteria, eggs, weed seeds and other harmful microorganisms in the chicken manure, and generating a large amount of nutrients beneficial to the plant growth and the plant absorption. The process is simple and easy to implement. The raw materials of the prepared organic fertilizer are rich in nutrition. Meanwhile, the prepared organic fertilizer is high in fertilizer efficiency and rich in nutrition, and can coordinate the soil nutrient balance, improve the soil nutrient, promote the plant growth, increase the plant yield and improve the plant quality.

Fire-retardant powder comprising at least 30% by weight of mono ammonium dihydrogen phosphate and / or di-ammonium monohydrogen phosphate, at least 5% by weight of alkaline bicarbonate, at least 3% by weight of silica, and at least 5% by weight of a compound selected from the group consisting of: sodium chloride, potassium chloride, potassium bromide, potassium sulfate, magnesium carbonate hydroxide pentahydrate, magnesium chloride hexahydrate, iron(II) sulfate heptahydrate, zinc (II) chloride, and combinations thereof. The invention also relates to building materials preferably comprising natural fibers and comprising at least 5% by weight, and at most 30% of a powder according to the invention.

The invention discloses an oxetane compound applied to cationic photocuring systems. The oxetane compound is formed by a compound containing at least one hydroxyl group and at least one oxetane groupand halogenated hydrocarbon via nucleophilic substitution reaction, is not sensitive to humidity, and has the advantages of being high in reactivity, low in odor and viscosity, and strong in adhesion.

The invention discloses low-odor high-transparency ultrahigh flowability polypropylene which comprises the following components in percentage by mass: 96-99.89% of a polypropylene resin, 0.1-2% of a free radical form initiator, 0-0.2% of a lubricant, 0.01-0.3% of an antioxidant and 0-1.5% of a compounded transparent nucleating agent. Due to adoption of the compounded transparent nucleating agent which is sufficiently reacted with the polypropylene resin, the initiator, the lubricant and the antioxidant synergistically, the ultrahigh flowability polypropylene which is high in transparency, lowin yellow index and low in haze is prepared. In addition, the invention further discloses a completely novel preparation device and process of the low-odor high-transparency ultrahigh flowability polypropylene. The transparency, the low odor and the low volatilization of the product in the preparation process can be further improved on the basis of a completely novel formula, the product can be prepared by using a one-step method, large-scale popularization and production in factories can be implemented, meanwhile, the problem of small molecule residues in the product is also solved to a largeextent, and aftertreatment processes of non-woven fabric manufacturing companies can be simplified.

To provide boots which have hygienic and health advantages such as the ability to effectively deodorize the inside of the boots. The entire outer surface excluding the sole of the boot is made of a material which is formed into an integrated body by continuously knitting a yarn and, in the material, at least the instep-covering part to cover the toe or the instep of the foot is knitted out of a yarn including a fiber into which minute particles having one or more functions selected from among deodorizing function, antibacterial function or blood circulation promoting function. The boot can also be formed by knitting a twine which is made by twisting a fiber into which minute particles having deodorizing function, antibacterial function or blood circulation promoting function around a fiber which has high elasticity.

A harmless processing comprehensive utilization technology for life garbage is mainly used for solving the technical problems such as non-environmental protection of prior life garbage processing manner. The technical proposal mainly comprises the following steps of: separating and screening raw life garbage to separate recyclable waste materials such as paper, plastic and heavy metals for recycling and reusing, and combustible materials such as plants and waste clothes for burning in a burner; and then crushing the rest garbage, sieving, sorting, adding active bacteria, stirring completely, feeding into a high-temperature fermenter, and fermenting to obtain organic fertilizer and nutrient soil. According to the invention, the full process for processing the life garbage including fermenting, decomposition, deodorization, sterilization, purification, concentration and discharge only takes 18 to 30 hours, the volume of the waste materials can be reduced by about 30% to 70%, and high-quality organic fertilizer and nutrient organic substrate excellent in color, odor and nutrient can be produced. The process is energy-saving and environment-friendly, and can be widely used to process and reuse the life garbage.

The invention discloses a method for processing jasmine black tea. The jasmine black tea is obtained by the steps of: sun-drying fresh leaves of tea, withering, shaking green, twisting, fermenting, scenting and baking. The jasmine black tea prepared by the method retains the sweetness and mellowness of black tea and also has the faint scent of jasmine; and the product has an elegant appearance, excellent taste and aroma, strong and natural aroma, and mellow, sweet and refreshing taste, and leaves the aroma on teeth and cheeks and has fragrant aftertaste after being drunk, and the soup color is bright.

The invention belongs to the technical field of farm chemicals and discloses development and application of fatty acid methyl ester serving as environment-friendly solvent in pesticide preparations. The fatty acid methyl is adopted for replacing high-toxicity solvents in massive use at present. The fatty acid methyl which serves as the environment-friendly solvent is directly added in production of the pesticide preparations and capable of dissolving and dispersing active ingredients of pesticides, and after the fatty acid methyl ester is combined with other additives, qualified pesticide preparation products can be made by stirring, mixing, shearing or grinding. The fatty acid methyl ester is applicable to all pesticide products such as mineral pesticides, biological pesticides, chemical synthetic pesticides and the like.

A decorative holder for holding potpourri or decorative items having hinged opening at the top, side, or bottom, the hinged opening capable of being secured closed, for example, by a latch or hook and loop closure, and capable of holding materials therein. The framed holder is formed by a plurality of frame supports that form a base and a lid and side frame supports and simulating the shape of one or more natural products such as a fruit, vegetable, nut, seed, animal, reptile, sea creature, star, or ball, box, or other similar object. The plurality of frame supports may further include a framework that is woven in and about the holder to secure the decorative items. The materials to be secured in the holder may include decorative items; botanicals, natural and / or synthetic; food stuffs; personal effects; and the like, all having a size and shape larger than any aperture in the holder.

The invention provides an adhesive for labeling, which comprises 1 to 40 percent of animal glue, 0 to 45 percent of emulsion, 0 to 20 percent of starch, 5 to 40 percent of diluting agent, 0 to 10 percent of cross-linking agent, 0 to 5 percent of thickening agent, 0.001 to 2 percent of additive, and 20 to 50 percent of water. The adhesive has the advantages of good initial adhesion, low solidification point, good water resistance, strong enzyme hydrolysis resistant stability, elution in non-alkaline high temperature water and so on, well meets the requirements of improving production speed, improving the qualification rate of the production and recovering containers at present, and is particularly used for labeling beer bottles.

The invention relates to a cool, fragrant and sweet additive for cigarettes and a preparation method and application of the cool, fragrant and sweet additive, and belongs to the field of cigarettes and tobacco. 20%-35% of menthyl acetate, 20%-50% of beta-cyclodextrin or pregelatinized starch and 30%-45% of deionized water are mixed in percentages by mass, and are ground for 1-4 hours at the room temperature to obtain paste, and the paste is placed in a light-shading and shade place in an exposed manner for 12-36 hours to obtain the additive. By the additive, the fragrance of the cigarettes canbe increased, the cigarettes are cool, fragrant and sweet obviously, and have abundant fragrance, irrigation is reduced, and smoking satisfaction and enjoyment of the cigarettes are improved.

The present invention relates to a low-odor flame retardant styrene-based resin composition and a preparation method thereof. The composition comprises the following components, by weight, 60-80 parts of a styrene-based resin, 0-10 parts of an impact modifier, 8-20 parts of a bromine-based flame retardant agent, 1-5 parts of a flame retardant synergist, 0.5-5 parts of a compound containing phosphorus and 1-3 parts of a hydrated metal oxide. The preparation method comprises: adding the raw materials excluding the hydrated metal oxide to a high-speed mixer to carry out premixing to obtain a premixed material; adding the premixed material and the hydrated metal oxide to a twin screw extruder; carrying out treatments of conveying, melting, shearing, extruding, cooling and pelletizing to obtain the product. According to the present invention, the compound containing the phosphorus and the hydrated metal oxide are added, such that the odor of the flame retardant styrene-based resin composition is improved to the maximal degree; the plasticizing temperature of the material is reduced, the thermal stability of the material is improved, such that the discoloration risk due to decompositionof the flame retardant agent is reduced, and the odor of the halogen flame retardant styrene-based material during the forming process and the product using process is effectively reduced.

The invention discloses a normal-temperature preparation method for ultrafine coccidia powder. The method comprises the following steps of: selecting decoction pieces of sweet wormwood, hairyvein agrimony, tuber fleeceflower root, Chinese pulsatilla root and cinnamon according to parts by weight, drying and smashing to obtain coarse powder of which the granularity is 80 meshes; putting the obtained coarse powder into a rod mill for smashing, feeding into the special bilateral airflow sieving machine through wind for sieving with a 500-mesh sieve, sieving to obtain power of which the particle diameter is less than or equal to 25 micrometers, conveying the powder which is obtained by sieving into a cyclone aggregator through airflow generated by a draught fan for collecting to obtain finished ultrafine coccidia powder; and collecting powder which is not sieved with the 500-mesh sieve with a funnel, and conveying to the rod mill through a pipeline for smashing circularly once again. The method has the advantages that: the entire preparation process is performed at the normal temperature without low temperature or special additional conditions; the particle diameter of a prepared finished medicament is less than or equal to 25 micrometers, and the cell-wall breaking rate and the biological availability are greatly increased; and due to the adoption of the bilateral airflow sievingmachine, the preparation process of the ultrafine coccidia powder is simplified, and the aim of controlling the quality standard of Chinese medicinal powder is fulfilled.

The invention relates to a sustained-release oral ulcer film having biological adhesion and a preparation method of the sustained-release oral ulcer film. According to the formula, the sustained-release oral ulcer film having the biological adhesion consists of the following components in percentage by weight: 5-50% of a bio-adhesion material, 5-80% of a sustained-release film forming material, 0.5-10% of a medicine, 1-50% of a supporting agent, 1-20% of a plasticizer, 0.1-0.5% of a bacteriostatic agent and 0.5-1% of a flavoring agent. The film provided by the invention, which is prepared in a specific production mode, is good in stability, and excellent biological adhesion and sustained-release performance of the film can be kept for a long time; a soluble sustained-release gel can be gradually formed as the film is adhered to an ulcer surface and absorbs water, so that contact of the ulcer surface with external side is prevented; the oral ulcer film provided by the invention has the characteristics of diminishing inflammation, alleviating pain, achieving an antibacterial effect and being free from toxins, irritation, mutagenic action and the like; and the oral ulcer film can promote growth of blood vessel endothelium and proliferation of fibroblasts and keratinocytes, and subsequently, the oral ulcer film can promote regeneration, repair of healing of the ulcer surface.

The invention provides corn straw nano dietary fiber and a preparation method thereof. The method adopts cellulase-producing bacteria for pure culture or mixed bacteria cofermentation to ferment corn straws, and carries out the ultra-high pressure homogenization treatment on the fermented corn straws to obtain the nano dietary fiber through spray drying or freeze drying. The corn straws are washed by water to remove impurities, dried, crushed and sieved, mixed evenly with skim milk powder or other substances and the water, sterilized and cooled; and a single-bacterium or multi-bacteria seed liquid of the cellulase-producing bacteria is inoculated into a culture medium for fermentation, a product after the fermentation is rinsed until the pH value is neutral, and the corn straw nano dietary fiber is prepared after homogenization treatment and spray drying or freeze drying. The method has simple preparation technology, mild conditions and no pollution to the environment, and is easy for industrialized production; and the dietary fiber has exquisite taste, increases the solubility, greatly improves water retention ability, water absorptivity and expansive power, and improves the content of soluble dietary fiber by more than 50 percent.

The invention provides a preparation method of hydroxy methionine salt and a compound, comprising the following steps: a. feeding metal hydroxide or basic metal oxide or amphoteric metal oxide and 2-hydroxy-4-methylthiobutyricacid into a closed and corrosion resistant reaction kettle to react for 0.5-12h according to a stoichiometric ratio, taking the low-boiling polar organic solvent or the mixed solvent thereof with water as the reaction medium, stirring, separating the target product, washing and drying to obtain the products; and b. recycling the reaction medium. The preparation method of the invention has short route, no consumption of acid or alkali reagent, low cost, easily-controllable product quality, environmental friendliness and the like, thus being applicable to large-scale industrial production.

The invention discloses high-weather-resistance high-stain-resistance white paint for outdoor woodware and a preparation method of the paint. The high-weather-resistance high-stain-resistance white paint for the outdoor woodware comprises the following components in percentage by weight: 28-32% of water-based pure acrylic emulsion, 28-32% of water-based self-crosslinking acrylic emulsion, 22-27% of titanium dioxide pulp, 0.2-0.3% of a defoaming agent A, 2-3% of a film forming additive, 1.5-2% of wax emulsion, 0.3-0.5% of a light stabilizer, 0.5-1% of nanometer zinc oxide pulp, 0.1-0.15% of a first in-tank preservative, 0.2-0.4% of mildew-proof algaecide, 0.2-0.3% of a substrate wetting agent, 0.2-0.7% of a first thickening agent and 3.85-16.3% of deionized water or purified water. The high-weather-resistance high-stain-resistance white paint for the outdoor woodware is resistant to weather, stain and water, low in smell and VOC and excellent in environmental protection and safety comprehensive performances; the preparation method is simple in process and low in cost.

The invention discloses a submicron powder bazheng powder normal temperature preparation method, which comprises choosing technical materials of akebiaquinata, dianthus superbus, polygonum aviculare, liquorice, fried jasmine, rheum officinale, juncos communis medicinal slices, soapstone and plantain seed raw materials in proportion; drying and smashing to obtain coarse powder; extracting plantainseed oil in the plantain seed coarse powder to be reserved; evenly mixing the rest of coarse powder and the plantain seed dregs in a rod mill to be smashed to be sent into a special bidirectional airflow sieving machine for 500 sieves to obtain powder materials with the grain diameter equal to or smaller than 25 micrometers; achieving bazheng powder submicron powder by collecting powder materialsconveyed to a cyclone material collector by air airflow generated by an air induced fan; collecting the powder material not sieved for 500 sieves to be conveyed into the rod mill through a pipeline to be smashed repeatedly; and evenly mixing the collected bazheng powder submicron powder and the plantain seed oil to obtain submicron powder bazheng powder end products. The submicron powder bazheng powder normal temperature preparation method has the advantages of performing the whole process at the normal temperature. The special bidirectional airflow sieving machine simplifies preparation process of the submicron powder bazheng powder.

The invention provides a method for prolonging the preserving time of chilled fresh chicken. In the method, a newly slaughtered chick carcass is used as a raw material; nisin, sodium dehydroacetate and glycerol monolaurate are adopted as preservatives; composite preservative is prepared by adding 0.03 to 0.07 grams of nisin, 0.25 to 0.35 grams of sodium dehydroacetate and 0.6 to 0.8 grams of glycerol monolaurate into 1kilogram of sterile water; the glycerol monolaurate is firstly dissolved in 30 milliliters of 65 percent edible ethanol, and is added into the composite preservative; and the pH value of the preservative is adjusted to be between 4.0 and 5.0 by alimentary acetic acid. The storage time of the chilled fresh chicken which is subjected to preserving treatment is obviously prolonged, and is prolonged to 7 days from the primary 4 days, and the quality of the preserved chicken can be well maintained over 7 days. The application of the method ensures that individual slaughtering of the chicken can be transformed into factory slaughtering on the premise that the excellent flavor of the chilled fresh chicken is maintained, thereby greatly improving the environment, reducing pollution of individual chicken slaughtering to urban environment, and ensuring that safety and sanitation of foods can be better controlled.

The invention relates to novel ink and a production method thereof. The novel ink composition mainly comprises 10-15% of coloring agent, 12-20% of sizing material, 2-4% of wetting agent, 2-3% of brightening agent, 5-10% of oxidizing agent, 10-15% of stabilizing agent, 3-5% of preservative and the balance water according to percentages by weight. The novel ink adopts latest product structures and overcomes the problem that existing ink is not enough in brightness and fastness. Main addition of the brightening agent effectively improves brightness of the ink, and simultaneously, addition of the oxidizing agent in an auxiliary matched mode enables collagen in the ink to be synchronous reacted with the brightening agent and the oxidizing agent under association of water, thereby enabling the ink to improve writing and adhering fastness while greatly improving the brightness.

The invention discloses a method for producing chicken manure fermented feed, which comprises the following steps that: fully mixing fresh chicken manure with a carrier, and sterilizing and cooling the mixture to obtain a mixed material for standby; mixing and dissolving food-grade glucose in water to obtain nutrient fluid; mixing bacteria solution of yeast with bacteria solution of lactobacillus to prepare mixed bacteria solution; fully mixing and sealing the prepared mixed material, nutrient fluid and mixed bacteria solution in a plastic bag for fermentation at a temperature of between 25 and 35 DEG C for 2 to 4 days to obtain a fermentation material; and drying the fermentation material prepared by the steps; and when the water content in the fermentation material is reduced below 10 percent, crushing the fermentation material to obtain a finished product of the chicken manure fermented feed. By the method, parasite ova and harmful bacteria contained in the raw chicken manure can be removed, and the chicken manure can be prepared into the feed with good palatability and rich nutrition.

The invention is directed to a trash receptacle which includes engaging members that communicate with a satellite vehicle to compact trash. Such trash receptacle comprises a rigid outer housing having four main panels (front panel, a back panel, a first side panel and a second side panel). The front panel includes passageways. The four panels form a basin. Positioned on the back panel via a hinge is a pivoting top door that attaches through a lock assembly. The pivoting top door further includes access doors. A compaction ram, having ram connectors that exit the various passageways of the front panel, is positioned between the first and second side panels. The compaction ram includes one or more track guides capable of resting within tracks located on the first side panel and second side panel of the rigid housing. Such compaction ram may include a plurality of triangular beams having sharp edges.