33results about How to "Low residual formaldehyde" patented technology

The invention provides a production method for a damp-proof ceiling decoration density board. The production method includes the steps that broken wood materials or broken gains such as various types of straw and nutshells which are generated after crops are harvested and damp-proof urea-formaldehyde resin adhesives are mixed and pressed into a board, and the board and melamine-soaked paper or aluminium oxide wear-resistant paper are pressed and attached at a high temperature to form the damp-proof ceiling decoration density board. Three times of cold pressing, three times of hot pressing and two times of heat dissipation regimens are adopted for board forming. The cold pressing temperature is the room temperature, the cold pressing pressure is 2.5 MPa, and the hot pressing pressure is 1.5-2.0 MPa. The temperature of the first time of hot pressing is 130-135 DEG C. The temperature of the second time of hot pressing is 125-130 DEG C. The temperature of the third time of hot pressing is 120-125 DEG C. The heat dissipation regiments are achieved by lowering the temperature of a constant temperature room to the room temperature through natural ventilation cooling, and the time ranges from 3 h to 4 h. The melamine-soaked paper or the aluminium oxide wear-resistant paper is attached to the surface of the board at a temperature of 150 DEG C and under the pressure of 1.5 MPa.

The invention provides a method for producing a high-temperature-resisting oriented particle board by using a total-eucalyptus leftover material. The method comprises the steps of material preparation, drying, debarking, impurity removing, sorting, storage, respective gluing of a surface layer and a core layer, classified paving, pre-hot-pressing molding, sanding of an overcoating and the like, wherein the surface layer is coated with an isocyanate sawdust powder composite adhesive; the core layer is coated with a high-temperature-resisting composite urea resin adhesive; the core layer wood shaving is of a three-layer structure which comprises a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer; the core layer middle layer is paved longitudinally; the core layer upper surface layer, the core layer lower surface layer and the surface layer are paved horizontally. The oriented particle board prepared by the method provided by the invention is 31MPa to 40MPa in parallel static bending intensity, 4605MPa to 4776MPa in parallel elasticity modulus, 1501MPa to 1770MPa in vertical elasticity modulus, 10% to 18% in thickness swelling rate of 24-h water absorption and as high as 89009N in vertical nail-holding power, and is good in dimensional stability and reliability. Moreover, the oriented particle board prepared by the method provided by the invention is also excellent in heat resistance.

The invention provides a method for producing a weather-resistant oriented strand board by using a full-eucalyptus leftover material. The method includes material preparation, drying, peel and impurity removing, sorting storage, gluing of a surface layer and core layer, classified pavement, pre-hot pressing forming, facing sanding and other working procedures. The surface layer is coated with isocyanate sawdust powder composite adhesives, and the core layer is coated with weather-resistant composite urea-formaldehyde resin adhesives. Core layer wood shavings are divided into three layers of structures and comprise a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer. The core layer middle layer is longitudinally laid, and the core layer upper surface layer, the core layer lower surface layer and a surface layer are transversely laid. According to the oriented strand board prepared through the method, the static bending intensity in the parallel direction is 31-40MPa, and the parallel elasticity modulus is 4580-4760MPa; and the vertical elasticity modulus is 1510-1790MPa, the 24 h thickness swelling rate of water absorption is 11%-16%, vertical nail-holding ability reaches up to 87800N, and the dimensional stability and reliability are good. Moreover, the oriented strand board prepared through the method has excellent weather resistance.

The invention relates to a home building material, in particular to a method for making an insect-proof low-aldehyde wardrobe board. The method for making insect-proof and low-aldehyde wardrobe boards is characterized in that it includes the following steps: plank rotation—drying—repair—adhesive coating—pre-pressing—hot pressing—edge trimming and sanding—insect-proof treatment—wear-resistant paper sticking— Decorative veneer - edge banding. The formaldehyde residue of the adhesive used to make the wardrobe board in the present invention is low, and the aluminum alloy frame is inlaid around the wardrobe board, which can effectively prevent moisture and moisture in the air from penetrating into the inside of the board, and improve the moisture resistance and water resistance of the wardrobe board. The wardrobe board prepared by the present invention has good properties such as moth-proof, mildew-proof, moisture-proof, wear-resistant, etc., the residual amount of formaldehyde is low, and the harm to the human body is reduced, and the quality of the wardrobe board obtained is stable, the size stability is good, and it is not Easy to crack and damage, not easy to deform, long service life.

The invention relates to a method for producing a low-formaldehyde medium-density fiberboard and belongs to the technical field of wood resource utilization. The method for producing the low-formaldehyde medium-density fiberboard comprises the technological steps of raw material slicing, impurity-removal and screening, boiling, waxing and hot grinding, gluing and drying, mat formation and hot pressing, and finished product obtaining. According to the method, residues, such as battens and waste veneer, generated during wood processing are used for producing the low-formaldehyde medium-density fiberboard, waste materials are recycled, and full utilization of wood resources is effectively achieved; the formaldehyde residual volume of low-formaldehyde urea formaldehyde resin adhesive used for producing the medium-density fiberboard is low, in this way, harm to the health of human bodies is reduced, and the bonding force is high; in addition, the fiberboard has good damp-proof performance and good water-proof performance, the internal structure of the board is uniform, the density is proper, the dimensional stability is high, the quality is stable, and the service life is long.

The invention provides a manufacturing technology for an anti-flaming low-aldehyde solid wood composite floor board. The manufacturing technology for the anti-flaming low-aldehyde solid wood composite floor board is divided to four processes: the preparation process for modified urea resin, the synthetic process of flame retardant phosphorus polyurethane, the glue-regulating technology process, and the hot plate technology process. The formaldehyde residual quantity of the anti-flaming low-aldehyde solid wood composite floor board is less than 0.3 mg / L, the anti-flaming effect of the used phosphorus polyurethane flame retardant is good, the poisonous gas is not released during the anti-flaming process, and the environment is protected. The production technology of the hot-pressing technology process uses the hot-cold pressing compound technology, and the continuous production of the solid wood composite floor board is achieved by two times of laminating.