Woodworking laminating

By far the bulk of amino resins are used in the woodworking industry for the manufacture of chipboard, plywood and as general glues and adhesives. Melamine-formaldehyde is an important component of decorative laminates. The amount of amino resins used for moulding applications is only of the order of 5% of the total. 

Internal fltlings snch as cupboards, drawers and shelves must be kept to a minimum. These may be made fiom stainless steel or a laminated plastic, which may be easily cleaned or disinfected bare wood is to be avoided, although painted or otherwise sealed woodwork m be satisfactory. Stainless steel trolleys can be used to transport eqiripmerrt and materials within the clean and aseptic areas but these must remain confined to then-respective units. Equipment should be so designed as to be easily cleaned and sterilized (or disinfected). 

Polycondensation adhesives based on phenol or phenol derivates with formaldehyde are mainly used in the production of wooden constructions (in woodworking one traditionally talks of glueing instead of bonding ), for example, in the manufacturing of laminated bonds (plywood, chipboard, fiber board, beams). Since in these applications, the adherends are able to absorb the water developing during the polycondensation reaction, the processing occurs in heated presses to enable the application of the necessary contact pressure at the required temperature (Section 7.2.4). For applications in nonindustrial fields these adhesive are practically unimportant. 

Because of the need to remove water, most applications for aqueous adhesives are with materials that would allow transmission of water vapor. Hence the major uses are with paper, wood and fabric, either as binders or laminating adhesives. Typical applications of emulsion adhesives include the following remoistenable gummed tape, tube winding, box manufacture, plywood manufacture, woodworking, bookbinding, abrasives manufacture, and as textile adhesives. 

A relatively recent application area for pcD has been in the woodworking industry. Wood composites such as medium density fibreboard (MDF), chipboard, laminated boards with plastic coatings, for use in furniture and on floorings, and also composites, used in wall claddings and in ceilings, all tend to be highly abrasive... 

These adhesives have few conventional engineering applications, being commonly used in the woodworking industry for bonding and lamination of wood and wood-associated materials. 

This equipment is used to feed the glue mix automatically to various woodworking machines such as roll coaters, jointing machines, plywood machines, furniture assembling machines and laminating machines. 

The cutting unit cuts the paper on hne. The speed of such a laminating line may reach 40 m/min by using fast curing urea-formaldehyde adhesives (refer to the Chapter 5, Woodworking and Furniture Adhesives , of Volume 3 of this Handbook). 

Faustel, Steinemann, Gasway, all from USA, also Homag Germany for vacuum press machines which are used for PVC film lamination in woodworking. 

Building and construction Assembly of structural panels (wood, metal, plastics and insulation materials), laminated panels, assembly of glazing systems, high-duty flooring, adhesive/sealants for woodwork and masonry. 

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