581 results about "Wood drying" patented technology

Present invention refers to timber quick drying method. It contains 1, putting to be processed timber in timber drying chamber, heating from 30 degree centigrade to 70-98 degree centigrade within 4 to 10 hr and making timber drying vapour being saturated state, 2, keeping temperature for a period, holding time scaling up according to timber thickness, holding time hrs being equal to timber thickness cms, 3, fast reducing timber drying chamber temperature in a period according to timber thickness, 4, repeating step 1-3 by several time, wherein each time the timber heating time being 10-50 minutes, and removing filling saturated vapour process to reduce timber moisture content to demand value. Said invention has equal moisture content gradient and temperature gradient and saves energy source

The invention discloses a system for drying wood, which comprises a drying kiln, a humidity generator, a heat energy recoverer, a filter and a control system, wherein the drying kiln is provided with a gas inlet and a gas outlet; high-temperature waste gas discharged out of the gas outlet of the drying kiln is filtered by the filter, then is input to the heat energy recoverer, and is discharged out after performing heat exchange with low temperature gas from the humidity generator in the heat energy recoverer, and the heated low temperature gas output by the heat energy recoverer is sent into the gas inlet of the drying kiln through a pipeline; and the control system controls the work of the drying kiln, and controls the humidity of the low temperature gas output by the humidity generator according to the temperature, the humidity and the moisture content of the wood to be controlled in the drying kiln so as to control the humidity of the gas input in the drying kiln. By setting the humidity generator and the heat energy recoverer, the system optimizes the drying quality of the wood and minimizes the energy consumption; and simultaneously, because the working gas is used circularly, the waste gas is prevented from being discharged to the atmosphere to pollute the environment.

The invention belongs to a timber drying method for eucalyptus planted forests. The method comprises the following steps: selecting materials; measuring initial moisture content, in which, sawtimbers are detected to obtain moisture contents and the sawtimbers of different moisture contents are respectively dried; stacking, in which, reasonable circulation of airflow inside a kiln is ensured and the capacity of the kiln is fully utilized to prevent timber warping and end checking; placing a moisture content check plate inside the kiln, in which, the moisture content check plate of dried timber inside the same kiln is determined according to requirements to check the moisture content of the check plate; and controlling the temperature and humidity inside the kiln according to the drying standards of different eucalyptus species. The timber drying method has the advantages of preventing eucalypti from crimpling in the process of drying and ensuring drying quality of eucalypti.

The invention discloses pre-processing equipment and a processing method for improving wood breathability. The device comprises a wood processing chamber in which a hollow cavity is arranged, an ultrasonic processing device, a wood holding assembly used for holding the wood to be processed, and a detecting device used for detecting the wood temperature, and the ultrasonic processing device is used for performing ultrasonic processing on the wood to be processed, wherein the wood to be processed is stacked on the wood holding assembly. The method disclosed by the invention is used for performing ultrasonic processing on the wood under a vacuum state so as to improve the wood breathability, get through the moisture passages in the wood to guarantee the smoothness of the passages when the moisture in the wood volatilizes during the drying process, improve the drying quality of the wood, reduce the drying defects during the drying process and shorten the drying period, and furthermore, the pre-processing equipment is simple, the operation is convenient, the processing technique conditions (pressure, ultrasonic power and frequency) are controllable, so that the equipment and the method are suitable for processing various types of wood.

A multichamber timber drying kiln in which different conditions are maintained in each chamber and methods of drying timber using such a kiln. In one aspect timber is rapidly heated within a first chamber (2; 202; 207) and then transferred to a further chamber (3; 203; 208) for further drying. Timber may be transferred from the first chamber (2; 202; 207) when the moisture content of the timber approaches the fibre saturation point A preheating chamber (1; 201; 206) may be provided to preheat the timber before passing to the first chamber (2; 202; 207). A conditioning chamber (4; 204; 209) may be provided after the further chamber (3; 203; 208) to condition the timber. Energy transfer means (49–53; 54–58) may be provided to transfer energy between chambers.

The invention relates to a biomass composite granular fuel, and a manufacturing method and device thereof. Crop straws with low lignin content and heat value and wood materials with high lignin content and heat value are used as the raw materials, pulverized, mixed in a random ratio and granulated to obtain the granular fuel. The manufacturing method comprises the following steps: using crop straws with low lignin content and heat value and wood materials with high lignin content as the raw materials, respectively pulverizing and drying the crop straws and wood materials, mixing, softening with steam, molding, cooling and packaging to make the granular fuel. The manufacturing device comprises a wood chipping and pulverizing system, a pulverized wood drying system, a straw cutting and pulverizing system, a pulverized straw drying system, a granulating system and a product processing and packaging system. The composite granular fuel of the invention does not need adhesive or other additives with high heat value, thereby keeping the fixed granule shape and enhancing the heat value of the fuel.

The invention discloses lumber drying equipment and a method of drying lumber by using equipment. The device comprises a lumber drying room (1) with a hollow cavity in the inner portion, an ultrasonic wave processing device (2), a vacuum supply device (3) carrying out the vacuum supply processing to the hollow cavity of the lumber drying room (1), an installing material assembly (4) placing to-be processed lumbers and a heating device (5) carrying out heating processing to the to-be processed lumbers. An ultrasonic wave energy converter is directly contacted with the lumbers in the drying process. The lumbers are dried under the vacuum condition. An ultrasonic wave with certain frequency and power is added in the lumber vacuum drying process. The lumbers are dried under the low drying temperature. Drying rate is high and drying quality is good. Produced drying defects under the high temperature condition of the vacuum drying can be avoided. The drying equipment is simple. The drying method is convenient to operate.

The invention discloses a method for preparing a zebra-strip upright post material for a wood stair by using moso bamboo. The method comprises the following steps of: 1, cutting 4 to 6-year old moso bamboo and cutting bamboo poles into bamboo sections with predetermined specifications; 2, splitting and breaking the bamboo sections; 3, putting a part of carded moso bamboo sections into a wood cooking kettle for overheat steam carbonization; 4, drying the carbonized carded moso bamboo sections and the remaining non-carbonized moso bamboo sections into a wood drying kiln for drying respectively;5, soaking the dried carded moso bamboo sections and the carbonized moso bamboo in a phenolic resin respectively; and 6, laminating and assembling the carded moso bamboo sections and the carbonized moso bamboo soaked with phenolic resin glue solution in a preset assembling mode and pressurizing and compacting the laminated and assembled carded moso bamboo sections and carbonized moso bamboo in a cold press. A recombined moso bamboo laminated material with attractive zebra strips prepared by the method can meet the use requirement on the upright post of the wood stair.

The invention provides a rotary drying method for timbers. The method comprises the following steps of: stacking the timbers and airing the timbers till the water content is about 30 percent; stacking the aired timbers, putting the timbers in a timber drying kiln, preheating, raising the temperature, humidifying, preserving heat and moisture, drying and dehydrating, finally treating and carrying out balanced humidification and rotary treatment many times. The method has the keys that a drying medium in a kiln is kept to form rotary vortex, and the water content of the timbers is not reduced in one step and is kept in rotary decline; by the rotary method, the internal stress of the timbers is dispelled in time, drying stress and surface hardening are eliminated, plasticizing deformation is prevented in the drying stage of the timbers, the defects of air shrinking, bending, deforming, cracking and the like are not caused, the degradation loss of the timbers is reduced to be below 6 percent, the drying period is shortened by about 20 percent, energy can be saved by about 15 percent, and limited timber resources are utilized more effectively; and the method has strong universality, is suitable for various different timbers, and can be widely applied to drying kilns with high automation degree.

The present invention is high temperature and high pressure steam timber drying process and apparatus. The timber drying process includes the following steps: stacking timber inside the drying apparatus, and drying timber with overheat steam in the pressure of 500-1000 kg/sq m, temperature of 120-180 deg.c, saturation degree of 20-80 % and flow rate of 6-12 m/s. The timber drying apparatus includes one medium temperature and pressure controlling system, one high pressure kettle assembly and one overheat steam generator connected through one pipeline. The present invention has high drying efficiency, low energy consumption, high drying quality, and capacity of greatly raising the size stability, corrosion resistance and weather resistance of timber.

The invention discloses a wood drying technology, which comprises a moist heat treatment, a drying step, a finishing step and a cooling step, wherein, the finishing step and the cooling step are combined to a finishing-cooling step. The invention adopts the progressive combination drying technology, namely, the moist heat treatment is controlled by a time base, and is controlled by a water-content coefficient base after the drying step, and the finishing-cooling step is a balancing water-content coefficient base. As the finishing step and the cooling step are combined to a finishing-cooling step, the wood drying technology of the invention assures the finishing treatment effect, and also saves energy and shortens drying period. The adoption of the progressive combination drying technology, namely, different base control method is adopted at different stage, assures machining accuracy, and the good versatility suits for various wood.

The invention relates to a high-temperature wood convective treatment method for balancing lumber moisture content. The adopted technical scheme includes that lumber pieces are bonded and stored for over 72 hours in natural conditions; the naturally dried lumber pieces are piled in layers in a steam lumber drying furnace, stripped cushions are put in parallel on each layer of lumber, the lumber pieces are erected in the middle space of the furnace, the lumber volume takes up 60 percent of the cubage of the steam lumber drying furnace; the furnace is heated and the temperature is kept under 50-55 degrees Celsius to dry the lumber for 48 hours and moisture is discharged once every four hours; the furnace temperature is kept under 60-65 degrees Celsius for 36 hours to dry the lumber and moisture is discharged once every six hours; the furnace temperature is kept under 70-80 degrees Celsius for 24 hours to dry the lumber and moisture is discharged once every eight hours; the steam lumber drying furnace is stopped for 3-5 hours after drying for 10-14 hours; the furnace is cooled down and the temperature of the lumber being taken out of the furnace is controlled. The invention guarantees the moisture content difference between every two lumber pieces within 1 percent and prevents lumber from shrinkage, cave-in, warp, distortion and cracking in a long period; the woodwork produced by the invention has stable quality and long service life.

The invention discloses a novel wood drying method. The wood drying method comprises the following steps in sequence: sawing wood to be dried into wood sections with required lengths and measuring the initial water content and the oven-dry density of the wood; stacking the wood in a drying room; measuring the temperature of a feeding end and a discharging end of a wood stack along the drying medium flowing direction; according to the relationship equation of the temperature of the wood stack, steam partial pressure in the drying medium and the water content of the wood, calculating the accurate water content of the wood; and drying the wood according to the water content of the wood and the common wood drying benchmark program so as to obtain the high-quality dry wood. According the method, the measured water content of the wood is accurate, and the defect of large error of the water content measured by an electrical measuring method in prior arts can be overcome. The method is suitable for drying wood with any water content, the factor to be controlled in the drying process is single, the system is stable, and the wood drying quality and the wood drying efficiency are improved.

The invention discloses a wood drying process. The wood drying process comprises the steps of 1, preheating; 2, high-temperature and high-humidity treatment; 3, drying; 4, maintenance. When the wood drying process is adopted for drying wood, the surface stress and internal stress of wood can be eliminated, surface cracking or internal cracking of wood can be prevented, the original quality of wood is maintained, defects such as air shrinkage, bending, crinkling and deformation do not occur easily, the rate of wood damage caused by improper drying is reduced greatly, and meanwhile, energy is saved and drying time is shortened.

A wood drying installation for a wood drying kiln including a pair of electrodes adapted to be inserted into a wood stack contained in the kiln, a resistance connected in a series circuit with the electrodes, an AC voltage source connected to apply an AC voltage across the series circuit, a phase detecting circuit connected to the series circuit operable to generate a signal representing the phase angle between AC voltages applied to different parts of the series circuit, and a processor to receive the signal. The system is operable to determine a moisture value corresponding to a capacitive component of the reactive impedance between the electrodes in accordance with a predetermined arithmetic algorithm relating the value to the phase angle.

The invention relates to a processing method of wood of the furniture industry, in particular to an anti-cracking technology of solid wood. The anti-cracking technology of the solid wood sequentially comprises the following steps of: (1) soaking a raw wood in a water tank for 60 to 90 days; (2) cutting the soaked raw wood into boards according to the required size; (3) steaming the boards in a steam box for 2 to 4 days; and (4) drying the steamed boards to a required moisture content. The raw wood is soaked for long time so as to lead the raw wood to die really; the boards are steamed for days; the wood is plasticized so that the boards are more tougher; the boards and the wood are combined so as to lead the wood to be tough, tensile and firm and is not easy to crack; and a special drying technology of first natural drying and then alternating temperature drying prevents the wood from cracking and deforming in the drying process.

In a monitoring system for a wood drying kiln having a housing with an interior area for placement of a charge of wood for drying the charge of wood, the interior area having a floor, environment devices for adjusting heat and humidity in the interior area of the kiln, and a control unit for controlling the environment devices, the improvement is a support in the interior area for supporting a representative sample of the charge of wood, a sensor mounted to the support for sensing the weight of the sample which is a function of moisture content in the sample and a proportioning mechanism connected between the sensor and the sample for suspending the sample and for applying a proportioned force resulting from the weight of the sample to the sensor. The sensor is connected to the control unit for generating a signal which is proportional to the weight, and thus, to the moisture content of the sample. A stand on the kiln floor has a member for carrying the support at a location which is spaced from the wood charge without requiring and kiln wall space. The invention also includes the possibility of supporting the sensor from the ceiling and at any location in the kiln whether the sensor is supported from the ceiling or the floor. The invention is also useful in kilns for drying other materials than wood.

The invention relates to a drying process for preventing eucalyptus wood shrinkage, and belongs to the technical field of eucalyptus wood drying. The process comprises the following steps of: (1) performing soaking treatment on fresh eucalyptus wood or raw eucalyptus wood with high water content; (2) after the soaked raw wood is placed for 3 to 5 days, processing the raw wood into boards with thickness of 5 centimeters or 7 centimeters; and (3) drying the eucalyptus wood boards by controlling the center temperature of the wood and the humidity of the drying medium, and performing heating, heat insulation, drying and humidifying treatment of multiple stages. By the process, the defects of shrinkage, bending, cracking and the like easily produced in the drying process of the eucalyptus wood boards are overcome, and a new path is developed for improving the additional value of the eucalyptus wood.

The invention discloses a moisture content measuring method for a wood drying process and a wood drying method. The moisture content measuring method for the wood drying process and the wood drying method include: measuring an initial moisture content and initial weight of to-be-dried wood, and stacking the to-be-dried wood in a drying kiln; measuring temperature and wind speed of media flowing through two sides of the stacked to-be-dried wood, acquiring saturated vapor pressure of moist air according to dry-bulb temperature, acquiring relative humidity of the moist air according to temperatures of wet and dry bulbs, and finally acquiring density and moisture content of the moist air so as to obtain moisture contents of the to-be-dried wood at different times; according to the moisture contents of the to-be-dried wood, drying the to-be-dried word according to wood drying standards so as to obtain high-quality dry wood. The moisture content measuring method is precise, simple, low in input, applicable to any wood moisture content measurement, less in measuring parameters, simple in calculation, systematically stable, capable of overcoming the defects of large measuring error and narrow range of an electric measuring method and improving quality of solid wood plates, high in efficiency and low in cost.

The invention discloses a wood vacuum drying-carbonization integrated kiln which comprises a kiln body, a vacuum system connected with the kiln body, a vapor system, a water discharging system, an air discharging system, a compression system and an electric control system. A rapid-opening door is arranged on the kiln body, a heating pipe and a convection fan are arranged in the kiln body, stand bars are arranged at the bottom of the kiln body, the kiln body is separated from the ground through the stand bars in a suspended mode, a kiln body weight sensor is arranged at the bottom of each stand bar, the kiln body is an interlayer kiln body, a thermal insulation material covers the outer wall of the kiln body, the interlayer of the kiln body is filled with cooling water, and a cooling water circulating heat-dissipating system is arranged outside the kiln body. According to the wood vacuum drying-carbonization integrated kiln, vacuum drying and carbonization of wood are conducted in the same kiln, integration of a wood drying device and a carbonization device is achieved, and the wood vacuum drying-carbonization integrated kiln has the advantages of being small in occupied area, saving in energy, high in work efficiency and the like.