摘要:
To facilitate separation of lumber pieces that are of different species, an indicator liquid is sprayed on to a fresh cut end of each lumber piece to produce a characteristic reaction, e.g. based upon pH. After a suitable interval the coated ends of the lumber pieces are optically scanned, the scanned image being analyzed spectrographically to identify the species of the lumber piece, e.g. as between spruce and fir. The lumber pieces are separated accordingly so that further processing thereof, e.g. kiln drying can be done under optimal conditions for that species.
摘要:
A novel method of making a wood composite employing cellulosic material as the wood component and pulverized blast-furnace slag as the binder component and the product produced thereby is disclosed. A settable mixture of the wood component, binder component and water is prepared and thereafter subjected to a forming pressure within a confined space. While in its confined condition, the mixture is also subjected to heat and carbon dioxide (CO.sub.2) for a time and at a temperature sufficient to cause accelerated and early setting of the mixture. Optionally, calcium-rich compounds can be added to the settable mixture as a slag cement binder enhancer and sodium silicate can also be used as a mineralizer. The cellulosic material can also be pre-treated with a fire retardant resulting in a cementatious wood composite exhibiting improved fire resistance and in situ fire load bearing strength. Slag cement is plentiful, being a by-product of steel mills, but as a binder, is significantly less expensive than Portland cement. Employing CO.sub.2 injection, comparable set times for slag and Portland cements can be obtained, but the wood composite employing a slag cement binder has superior final strength.
摘要:
A method and apparatus for rapidly determining the moisture content of a substance. An area of one surface only of the substance is subjected to a predetermined intensity of radiant energy for a selected period of time and the temperature rise is measured. The rise in the surface temperature of the substance such as pieces of wood, is approximately inversely proportional to the moisture content of the wood and thus is easily determined. This is obtainable by transporting the substance on a fixed speed conveyor past a heat source, variations in the rise and fall in the surface temperature readings immediately following the application of heat are representative of its moisture content; low readings indicating high moisture content while high readings being indicative of low moisture content.
摘要:
An apparatus for cutting wood, the apparatus comprising a housing element defining a work surface and an interior, a means for delivering wood to the work surface, a plurality of incising elements arranged in the work surface to incise the wood in a direction substantially parallel to the fibre of the wood, a plurality of slicing blades arranged in the work surface to slice incised wood, and an opening in the work surface opening into the interior of the housing element.
摘要:
The present invention relates to a method for controlling sapstain and mold in wood using a biocontrol agent having a high pH tolerance and an alkaline solution. Biocontrol agents that do not discolor wood may be introduced onto wood or wood products to prevent sapstain and mold. The biocontrol agent grows on the wood surface and protects the wood against attack by stain or decay fungi. The application of an alkaline solution containing a biocontrol agent having a high pH tolerance to the wood product is very effective in controlling stain or decay fungi. The alkaline solution raises the pH of the wood to a level which impedes growth of other wood-inhabiting fungi but does not inhibit colonisation of the wood by the biocontrol agent.
摘要:
A wood wall structure has standard components arranged in such a way that strength and ductile capacity exceeds those in current standard wall arrangements. The structure has a top plate and a bottom plate that are substantially the same, each plate having a groove along the center face, a central sheath is positioned between the top and bottom plates fitting into each groove. Pairs of vertical framing elements extend between the top and bottom plates with the central sheath sandwiched therebetween and attachments between the pairs of framing elements retain the central sheath in position.
摘要:
A method of producing laminated veneer lumber (LVL) with good dimensional stability, characterized by a particular lay-up of the veneers and the veneers being of at least two different wood species. The particular veneer lay-up and species arrangement, minimizes the tendency of warping and cracking of the LVL. All veneers are laid-up in pairs by species with the loose sides of each pair contacting each other and with the species pair sequence from face to core being identical on either side of the center ply or center line. The veneer tight faces of different species are bonded to one another. The dimensional stability of the LVL is optionally enhanced by a water repellent, flow promoter and bulking agent that is incorporated into the adhesive before application onto the veneer. The different species veneers are dried to different moisture contents before lay-up with the denser species being of lower moisture content than the less dense species.
摘要:
A press apparatus and method for steam pressing a mat of compressible material and a binder into a formed product and has particular application to the steam pressing of lignocellulosic material and a binder to form composite board and includes a border projection means generally configured to the outline of the end product to be produced and which is carried by a press platen, preferably the upper press platen, and which is intended to impinge into the mat during its compression and to effect a steam pressure seal at the impingement area of the mat. As a pressure seal of the compressed mat is created about the mat edges, steam can then be passed through the mat in order to cure the binder. If desired, cool air can be passed through the mat afer steaming to condense residual steam in the mat. The compressed mat after steaming, can also be subject to vacuum prior to releasing it from the press. The edges of the cured mat which have been subject to impingement, can subsequently be trimmed off.
摘要:
Apparatus for inspection of a cutting tool by an examination device is provided. The examination tool is preferably a camera. The apparatus includes a base and a cutting tool mounting member on the base for attachment of a cutting tool to be inspected. The mounting member is adapted to position the cutting tool at a viewing location for the camera. There is a movable arm having a mounting location for receiving the camera. The movable arm is mounted to the base for rotation such that the camera moves in a first plane that includes the viewing location. The movable arm is also pivotable away from first plane to a second plane. An aperture through the base permits observation of the viewing location by the camera when the arm is pivoted to the second plane. The apparatus of the present invention permits fast, accurate and consistent measurement of the cutting surface geometry of a cutting tool. Preferably, the mounting location for the camera is movable along the arm and includes a positioning system to automatically adjust the position of the mounting location when the arm is pivoted from the first plane to the second plane to maintain the focus of the camera. By maintaining the focus of the camera between the first and second planes, the apparatus of the present invention permits rapid and accurate inspection of a cutting tool surface using software controlled inspection systems.
摘要:
The service life of wooden poles such as utility poles is increased by forming the butt end portion thereof with slots that penetrate deeply into the wood, these slots being formed prior to pressure treatment of the wood with preservatives and thus improving the penetration of the preservatives into the wood. After drying, the butt end of the pole is encased in a shell, suitably of polymers, that is bonded to the butt of the pole and presents a barrier to the penetration of fungus or insects, and likewise prevents the passage of liquids which might leach preservative from the pole into the surrounding ground.