Paper overlay

Secondary Treatments and Uses. Because hardboard products are utilized in a myriad of different ways, the variety of secondary treatments used by customers are practically unlimited. Hardboards are used in furniture, cabinets, paneling, doors, toys, and a host of other uses. Post-treatments may include cutting-to-size, finishing treatments with roU-appHed patterns, melamine overlays, printed paper overlays, paints, and even some extremely durable and water-resistant coatings used in tub and shower linings or other uses where water contact is frequent and extreme. 

A small amount of particleboard is made with a fire-retardant treatment for use in locations where codes require this material, as in some offices and elevators. Particleboards receive overlay and finishing treatments with ease. Wood veneers, melamine overlays, printed paper overlays, vinyl overlays, foils, and direct grain printing can all be done quite simply. A small amount of particleboard is also made in the form of shaped, molded articles such as furniture parts, paper roU plugs, bmsh bases, and even toilet seats. There is another small increment of particleboard made by the extmsion process. These products are made in small captive operations owned by furniture manufacturers which consume all of this production in their furniture. The extmsion process differs from conventional flat-pressed particleboard in that the wood furnish is forced between two stationary heated surfaces. The mats are formed from one edge and this edge is alternately formed and pushed between the heated platens, which are maintained at a distance equal to the thickness of board produced. This is an old, slow, small-scale process, but is stiU in use in at least one location. 

Overlay Paper. Overlay paper is a-cellulose paper of high purity, with substance weight in the range 20 to 80 g m-2. An essential feature is the refractive index, which is virtually identical with that of melamine-formaldehyde resin hence, after lamination—when all the fibres of the paper are wetted and consolidated with resin devoid of air—the overlay becomes transparent. It forms a durable, hard, clear layer to protect the decorative print layer below. 

Industrial Adhesives Paper Overlays Adhesive Resins Additives Hardeners... 

Dynea Oy is a leading provider of industrial adhesives and paper overlays. Its adhesives products include... 

Paper Overlays - (40% of wall panel consumption) are 1 to 2 mil printed paper films adhered to lauan plywood with PVA or other adhesive. Paper films are available in pre-topcoat or non pre-topcoat varieties. 

The domestic hardwood plywood industry has been trending towards the use of water based topcoats for some paper overlay, printed, and natural hardwood paneling products to reduce volatile organic compound emissions. To achieve desired surface product properties formaldehyde is often a component of the topcoat. 

Figure 14 provides a graphical representation of 27 chamber tests conducted on a variety of veneer, print, a paper overlay finished hardwood plywood paneling. Even though it is not shown, a breakdown by different product type did not affect the correlation by anymore than 5%. As with particleboard, the cloud of points below 0.2 ppm represents current production made to meet the H.U.D. hardwood plywood paneling standard (0.2 ppm chamber). The group of points between 0.24 and 0.36 ppm chamber are from earlier chamber studies needed to define the curve. 

Wood and wood-based materials such as plywood, fiberboard, paper-overlayed panels, and flakeboard, have specific properties which must be taken into account when formulating finishes for them. 

Because of their characteristic rigidity and brittleness in their cured state, when MF resins are used for impregnated paper overlays, small amounts (typically 3 to 5%) of modifying compounds are often copolymerized with the MF resin during its preparation to give better flexibility to the finished product and better viscoelastic dissipation of stress in the joint. Most commonly used are acetoguanamine, s-caprolactam, and p-toluene-sulfonamide (Formula 2). 

During heat curing of the MF paper overlay in the press, the complex decomposes, the MF resin is hardened by the acid that is liberated, morpholine is not vaporized and lost to the system, and on cooling the complex is reformed, leaving the cured glue line essentially neutral. 

In the meantime soak nitrocellulose Alters in 10 mM IPTG (1 ml 1 M stock/ 100 ml) for 30 min at room temperature, let air dry for several hours on a sheet of Whatman 3MM paper. Overlay plates with presoaked, upside-down filters incubate overnight at room temperature or for 6 hr at 37°C. 

Pipette this reaction mix through the paper overlay into the correct well. 

Saturating base paper (overlay paper) is made from special pulp and has basis weights of 15-40 g m. It is highly porous, free of dirt, and protects the underlying decor in the production of laminated products. 

Overlaid lumber is a composite of lumber and phenolic resin-treated kraft paper. Similar paper overlays are applied to veneer, plywood, fiberboard, and particleboard. Paper honeycomb cores also are made from phenolic resin-treated kraft paper, which is formed into a honeycomb of different geometrical designs, such as figure eight or hexagonal, in special... 

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