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Manufacturing fabrication glued plywood

Manufacturing fabrication glued plywood

Veneer is a thin slice of wood made by rotary cutting or slicing of the log. The appearance of veneer varies and it depends on how the log is cut. Moist, warm and debarked logs are rotary cut into thin layers called veneers after careful measuring and cutting of the logs. Long but thin slices of wood appear. Wood changes dimensions when it dries or absorbs water. Therefore, to produce a stable and high quality product, drying has to reduce the moisture content to the right level prior to further processing.

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Manufacturing Process of Veneer and Plywood

Geen, Grand Rapids, Mich. Application February 19, ,. In the fabrication of flat plywood panels a number of sheets or layers of veneer are glued together to form a composite panel; each sheet is composed of strips or pieces of veneer, for example, 6 inches wide; a coat of glue is applied to the edges of the strips; the glue being then dried, then moistened with a solution of formaldehyde, and then by me.

The handling of the strips for edge-gluing, and the handling of the sheets in assembling the plies, frequently result in splitting or damaging the veneer, not only at their margins, but also in their inner areas. This makes it necessary to temporarily secure together the edges at the split until the assembly of sheets is placed in the press or mold. Heretofore, so far as I am aware, it has been practically impossible to repair these splits except by adhesive tape applied to the exposed faces of the outer layers or plies of the panel or along the margins left for trim from the panel because it was necessary to remove the tape used for such repair from the finished panel.

This practice was objectionable because the complete removal of the tape from the exposed faces of the panel was difficult, resulted in marring the outer face of the panel, and the tape left an indentation in the exposed faces produced from the pressure in the press. The tape could not be used between the layers or plies because it usually consisted of paper coated on one face with bone glue which becomes sticky when moistened and is not water resistant.

It was objectionable to permit such tape to remain between the'plies, because it was not water resistant. In molding plywood into shells of single curvature it is sometimes necessary to assemble a series of pieces or sheets of veneer, each composed to form a single ply or layer and the layers are assembled in the mold with the grain in the contiguous sheets arranged at right angles to one another.

In this fabrication it is important and necessary to retain the sheets of each layer in place in the mold to avoid relative movement between them, so their edges will not work apart or overlap at the joints while the plies are being 1 superposed in the mold and until the shell has beerf molded to shape. Extreme care is necessary in retaining the sheets of each layer of veneer so their edges will not work apart or overlap.

This handling also frequently results in splitting the veneer. For these purposes, it is necessary to use tape between the layers. The paper tape, as before stated, could not be satisfactorily used between the layers and was objectionable for that purpose. The primary object of the invention is to provide an adhesive tape which can be used between the layers of the panel for efliciently securing the edges at a split or the edges between the sheets of a layer together between the plies or layers,.

This object is attained primarily by providing a film or tape of phenol formaldehyde alkali-condensed thermo-setting tape, strips of which can be placed between the edges of sheets ofintermediate layers or plies or across the joint or across splits on the inner faces of any of the plies, which will effectively hold the parts together until the panel is subjected to heat and pressure in the mold, and which will readily spread over the wood in the veneer and be water resistant when the glue in the panel and the tape has set.

Another object of the invention is to facilitate the fabrication of plywood panels and shells by theuse of a suitable adhesive tape between the layers, where necessary or desirable, and which can be permanently left in the finished product. The invention consists in the several novel features which are hereinafter set forth and more particularly defined by claims at the conclusion hereof.

An exemplification of tape embodying the invention and adapted for application between plies of veneer is produced from a film, such as tissue paper, preferably. The polyvinyl alcohol imparts wet-sticking characteristics to the surface of the wood to which the tape is applied.

The phenolic formaldehyde alkalicondensed thermo-setting resin PR14 provides the final insolubility with respect to solvents after the adhesive has passed through the bonding and curing process.

The water and the methyl alcohol act as solvents for reducing the viscosity of the glue so that it will spread readily over the surface of the film to which it may be applied. This tape, when its coated side is subsequently moistened, will possess highly adhesive properties before the glue is cured, and so that the veneer V the present invention, strips of tape which have to which it may be applied will be firmly secured together before the glue is cured. In fabricating panels of plywood in the manner before stated, with sections or sheets of veneer edge-glued together, strips of the treated tape are torn from a roll and applied across a split in any part of a sheet of veneer, or lapped over margins of the strips of wood forming the sheets, wherever such is desirable, by moistening the coating on the tape and pressing it against the face of the wood sufilciently so the coating on the tape will spread, firmly adhere thereto, and secure the edges of the split or sections in the same layer in the plane of the layer or ply.

In the outer layers of the plywood panel, the edges of the splits will be secured together by tape on the face which is not exposed. On the intermediate plies or layers, the strips of the coated tape may be applied to either face. Short strips of the tape may also be used to secure sheets together in edgewise relation wherever desired. In fabricating curved plywood shells, the tape is applied to repair splits in the'same manner on the non-exposed faces of the outer sheets and either of the faces of the intermediate sheets or layers.

The strips of tape are also applied to the margins of sheets in the same ply or layer to securely hold the edges of sheets of the same layer, wherever it is necessary or desirable, against working apart or overlapping at the joints when they are being, and after they have been, placed in the mold. Thedesired assembled number of plies, interleaved with a film of phenolic formaldehyde alkali-condensed thermosetting resin, are subjected to pressure and heat in a press or in a mold until the interleaved glue and the strips of tape have been cured and become permanently set.

The material in the strips of tape in the completed plywood panel or shell will be resistant to solvents and will be spread over and pass into the interstices in the faces of the veneer and will be so thin that no perceptable unevenness will be present in the outer faces of the finished panel or shell.

As a result, no removal of the material in the tape is necessary or possible. In the fabrication of shells having compound curvatures, each ply is usually composed of pieces of veneer cut into shapes to fit together in the been treated as before described are moistened on their coated faces and lapped across the seam between the pieces in the same layer for securing them in their arranged relation in the mold.

The moistened side of the strips of tape will have highly adhesive properties before the pieces and the layers are bonded together, so that the strips of tape will prevent the pieces from wcrkins apart or creeping together while the shell is being assembled in the mold.

After the layers'of the shells have been assembled in the mold, they will be subjected to heat and pressure for thermosetting the glue between the faces of the piles and the glue in the tape.

The preferred formula hereinbefore specified for the solution with which the film is treated may be varied within the following ranges: poly vinyl alcohol, 8 to 40 grams; PRl-l, 4 to 20 grams; the water and methyl alcohol in any sufiicient percentage to act'as a solvent for reducing the viscosity of the glue to the desired extent for spreading.

Ethyl alcohol, dimethyl ketone or isopropyl alcohol may be substituted for the methyl alcohol. Any of the following maybe substituted for poly vinyl alcohol, viz: gum arabic, gum tragacanth. The invention exemplifies an adhesive tape which can be used between the layers of plywood to secure together edges of splits in, or sheets of, wood-veneer in the same layer and which does not require removal of the material in the tape from the finished panel or shell.

The invention also exemplifies a method of fabricating plywood in which the edges of splits in the veneer or between sheets of veneer in the layers respectively are secured by tape which is applied between the layers without objectionable result in the finished panel or shell. The invention is not to beunderetood as restricted to the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by letters Patent is:. Tape adapted to secure together the margins of a sheet of wood veneer or a split therein comprising a thin paper film substantially. Tape adapted to secure together the margins of a sheet of wood veneer or a split therein comprising a thin paper fihn substantially.

Tape adapted to secure together the margins of a sheet of wood veneer or a split therein co prising a thin paper film substantially. Tape adapted to secure togetherthe marwood veneer or a split therein comprising a thin paper film substantially. Application February 19, , Serial No. The primary object of the invention is to provide an adhesive tape which can be used between the layers of the panel for efliciently securing the edges at a split or the edges between the sheets of a layer together between the plies or layers, and which does not require removal from the completed panel.

I The invention is not to beunderetood as restricted to the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by letters Patent is: 1. USA en. Process of making and utilizing sheeted adhesives and the products thus produced. Unified paper sheet, process of making, and pressure-sensitive adhesive tape made therefrom.

Bonding air-impervious flexible sheets using an adhesive,perforated,inner sheet and article produced thereby. EPB1 en. USB1 en. Shaped honeycomb structures and method and apparatus for making shaped honeycomb structures. GBA en.

Waterproofing Plywood. Sealing Plywood for longer life.

English en. About us Services Contact Us. Birch plywood production Manufacturing services Our company has a specialized workshop equipped with the panel saw machines, double-end profiling machine and machining centre with CNC; our qualified cuttermen carry out cutting and machining of plate materials MDF, plywood, laminated plywood , as well as fabricate component parts for case furniture, parquetry, etc. We offer services involving the following operations:. Cut-to-size plywoood.

Based in Tacoma, Washington, the Association is comprised of and represents manufacturers of structural plywood, oriented strand board OSB , cross-laminated timber, glued laminated glulam timber, wood I-joists, and laminated veneer lumber LVL. See the glossary backgrounder for explanation of these products. Adhesive and technology improvements eventually led to the manufacture of structural plywood from Southern pine and other species, and in the Association changed its name to American Plywood Association APA to reflect the national scope of its growing membership.

I've got to laminate 24 gauge sheet steel to baltic birch for a pair of Thermador refrigerator panels. Customer wants magnetic and blackboard. A buddy will cut the panels to size including ice maker cutout on a water jet. Testing with a few 12 x 12 pieces, to see what will hold up - especially with the water jet.

Plywood Glue Manufacturer

We offer a full range of plywood collections for your industrial and residential needs. Plywood is wood fabrication made of solid wood that is processed into sheets with the fiber direction on the wooden layer arranged transversely between the bottom layer and the surface layer using a special adhesive. In plywood production, a log is peeled into sheets of veneer which are then cut to the desired dimensions, dried, patched, glued together and then pressed under high temperature press to form the plywood panel. Depending on the type of log quality, color etc. Our plywood is known for its quality. Understanding that flatness and dimensional stability are essential in furniture manufacturing to bring about a perfect finishing and to minimize expansion and contraction, our range of plywood products exhibit the characteristics of being flat, dimensionally stable, durable, and of high precision. As flatness is a crucial factor in the secondary processing of plywood and is necessary for a smooth finishing, our plywood is also suitable for secondary processing. Last but not least, general plywood can also be used in concrete framework as a cheaper option for low-rise construction work. Our plywood products are the perfect choice for any interior work. We offer plywood designed with a more precise dimension as it is of great importance to interior work, particularly for flooring.

Environmentally-Friendly High-Density Polyethylene-Bonded Plywood Panels

Some of the details were edited by me ,according to China HPL production Process and related technology. High pressure laminates — Production process 2. Raw materials 3. Resin production 4.

Plywood and laminated wood are both made of layers laminae of wood glued together. The basic difference is that in plywood the grain of alternate layers is crossed, in general at right angles, whereas in laminated wood it is parallel.

The strongest, lightest, most versatile utility and decorative product made from a renewable resource, plywood is kilo for kilo stronger than steel. Plywood was the first type of engineered wood to be invented. It is made from thin sheets of wood veneer, called ply or veneers. The ply layers are bonded under heat and pressure with strong adhesives, usually phenol formaldehyde resin, making plywood a type of composite material.

Plywood Manufacturing

Mel Schwartz has degrees in metallurgy and engineering management and has studied law, metallurgical engineering, and education. His professional experience extends over 51 years serving as a metallurgist in the U. Bureau of Mines; metallurgist and producibility engineer, U.

SEE VIDEO BY TOPIC: Glulam Structure Pt.1 - Making varying geometry beams

The history of plywood is a history of the modern world. Combining lightness, strength and flexibility, plywood's story is a fascinating account of social, technological and design change over the past years. Take a journey, through ten-ish plywood objects, from a leg splint to the fastest aeroplane of the Second World War, from the Antarctic to the Finnish forests, from the handmade to the digitally cut. Plywood is made by gluing together thin sheets of wood called veneers, with the grain of each sheet running in an alternate direction. This creates a material that is stronger and more flexible than solid wood. The technique has been around for a long time — as early as BC in ancient Egypt — but it was not until the s that plywood started to be used on an industrial scale.

Engineered wood

Plywood is made of three or more thin layers of wood bonded together with an adhesive. Each layer of wood, or ply, is usually oriented with its grain running at right angles to the adjacent layer in order to reduce the shrinkage and improve the strength of the finished piece. Most plywood is pressed into large, flat sheets used in building construction. Other plywood pieces may be formed into simple or compound curves for use in furniture, boats, and aircraft. The use of thin layers of wood as a means of construction dates to approximately B. This technique was later used by the Greeks and Romans to produce fine furniture and other decorative objects. In the s, the art of decorating furniture with thin pieces of wood became known as veneering, and the pieces themselves became known as veneers. Until the late s, the pieces of veneer were cut entirely by hand.

We offer a full range of plywood collections for your industrial and residential Plywood is wood fabrication made of solid wood that is processed into sheets with of veneer which are then cut to the desired dimensions, dried, patched, glued.

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Geen, Grand Rapids, Mich. Application February 19, ,. In the fabrication of flat plywood panels a number of sheets or layers of veneer are glued together to form a composite panel; each sheet is composed of strips or pieces of veneer, for example, 6 inches wide; a coat of glue is applied to the edges of the strips; the glue being then dried, then moistened with a solution of formaldehyde, and then by me.

Descriptions of manufacturing processes 1. This analysis had to identify the amount, type and quality of energy required so as to identify possible energy savings compatible to the respective cost-benefit analysis. The following process descriptions of the manufacture of sawn timber, plywood and particleboard are of a general nature and should provide the reader with a broad outline of the production processes involved in the mechanical wood-based industry and the role in which energy plays a part.

Plywood is an important and stable building material, comprised of many different veneers glued together at right angles. These layers provide dimensional stability, but leave the edges, which expose all of the laminate sections, particularly vulnerable to water damage.

Thermoplastic films exhibit good potential to be used as adhesives for the production of veneer-based composites. This work presents the first effort to develop and evaluate composites based on alder veneers and high-density polyethylene HDPE film. The effects of these variables on the core-layer temperature during the hot pressing of multiplywood panels using various adhesives were also studied. UF and PF adhesives were used for the comparison. The findings of this work indicate that formaldehyde-free HDPE film adhesive gave values of mechanical properties of alder plywood panels that are comparable to those obtained with traditional UF and PF adhesives, even though the adhesive dosage and pressing pressure were lower than when UF and PF adhesives were used.

Engineered wood , also called mass timber , composite wood , man-made wood , or manufactured board , includes a range of derivative wood products which are manufactured by binding or fixing the strands, particles, fibres, or veneers or boards of wood, together with adhesives , or other methods of fixation [1] to form composite material. The panels vary in size but can range upwards of 64 by 8 feet 20m x 2. Engineered wood products are used in a variety of applications, from home construction to commercial buildings to industrial products. Typically, engineered wood products are made from the same hardwoods and softwoods used to manufacture lumber. Sawmill scraps and other wood waste can be used for engineered wood composed of wood particles or fibers, but whole logs are usually used for veneers, such as plywood , MDF or particle board. Some engineered wood products, like oriented strand board OSB , can use trees from the poplar family, a common but non-structural species.

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  1. Shalkis

    Very valuable phrase