• St. Petersburg

    (812) 458-59-47

  • Moscow

    (495) 933-97-56

Work recommendations

 

These recommendations have been developed taking into account general requirements for works with decorative paper-based laminates manufactured with the use of ordinary thermo-reactive resins. Decorative HPL plastic produced at our enterprise is made from standard raw materials purchased abroad, and its properties correspond to those of similar products.
 
 

Transportation

For  transportation of decorative paper-based laminate it is necessary to use only flat, well fixed pallets and avoid sliding the sheets. At handling operations, in order to prevent scratching of HPL sheets, it is necessary to lift them by hand, or use vacuum grippers.

IT IS NOT RECOMMENDED to transport the sheets of decorative plastic by traction, because foreign particles and sharp ends may damage the sheet surface.

 

Storage

 

Sheets of paper-based laminate should be stored in closed premises protected against moisture and sunlight. Optimal storage conditions:  18-20°С, relative air humidity 50-65%.

 

Sheets of thin and thick plastic material should be stored in original packaging or laid one onto another at a solid flat surface (on  shelves)

IT IS NOT RECOMMENDED to keep the sheets in a vertical position. The upper sheet can be covered with polyethylene film. 

 

Attention! When the decorative laminate is stored at low humidity (from 5 to 20%) or at high humidity (from 70 to 90%), it can constrict or expand. Due to this property, sheets of laminate and structures on which they are fixed should reach their moisture balance under conditions of use. Recommended storage conditions are temperature of 18-20°С and relative humidity of 50%. Time of exposition for  ventilation should be not less than one week. Sheets of laminate and construction plates to be ventilated are laid in a form of separate piles with spacers from wood strips, for example.

 

Mechanical operation

 

A. Laminate cutting. It is recommended to use cutting tools with hard-alloy inserts for cutting and drilling. In order to prevent formation of scores and splitting, laminate cutting should be arranged so that the milling cutter reaches a sheet from the side of decorative layer. The steel milling cutter should have the diameter from 25 to 45 cm for straight cutting and from 16 to 12 cm for curve cutting. The cutting speed should be from 25 to 40 m/min. In case both sides of the sheet are decorated, splitting on the lower side can be avoided by changing the angle of the knife contact (see Fig. 3). In order to prevent formation of cracks, all internal angles of the mortises should be rounded. This is made by means of drilling the rounded internal angles of the mortises directly before cutting. 

 

B. Drilling the holes. It is recommended to drill the holes for fixing screws with a diameter bigger than the diameter of a screw or a tapping screw, in order to provide for a free motion of laminate when it changes the size due to changes of the ambient temperature and humidity. In order to avoid splitting, holes in the laminate sheet are to be drilled in advance, on a horizontal surface from the decorated side, with a support onto a solid base from wood or chipboard.

 

C. Mounting the laminate. Only screws or tapping screws with horizontal support head (see Fig. 5) should be used. Sunk screws with conical head are not recommended for use, because a hole with bevel edge for them reduces the thickness of laminate to be mounted that causes additional reason  for its destruction. Tapping screws with smaller pitch of thread provide for more reliable connection. It is recommended to fix the screws or tapping screws with a tolerance for free movement, i.e. not to tight the screws absolutely; otherwise, the point of fixing will become a place concentrating the tensions thus causing destruction of a laminate sheet during mounting or afterwards, in service.
 

 

Gluing

 

Usually, laminate is glued onto chipboard, fiberboard, medium-density fiberboard, and plywood plates. Before gluing, it is necessary to equalize temperature and moisture of the laminate, glue, and base layer - preferably 18-22°С and relative air humidity about 50%. Freshly purchased chipboard, fiberboard, MDF, or plywood sheets should be dried during at least one week, so that the excessive moisture would not deteriorate the quality of laminate gluing. It is necessary to use wooden underlying plates with flat, even, polished, free of defects surfaces; it is also absolutely necessary to keep all the raw materials (laminate, glue, underlying) and surfaces to be glued clean, in order to avoid a risk of foreign particles inclusion or defects of the surface. The glue should be always applied onto the whole back surface of laminate, and it is important to check that it is applied evenly.

 

The applied quantity of glue depends on properties of the wooden underlying plates – the rougher a surface, the larger amount should be applied. It is essential to provide for uniform pressure at compression of laminate. After the laminate and underlying plate are glued, then in order to avoid non-uniform expansion, it is necessary to keep the structure during 48 hours at the temperature between 20 and  24°С, and relative air humidity between 45 and 55%.

 

Depending on equipment and type of underlying plate, various types of glue can be used. Some recommendations for the most widely spread types of glue and equipment are provided below. The recommendations are of general character, and can be changed depending on conditions of laminate usage conditions. Anyway, it is better of all to consult with a glue supplier to specify necessary parameters.

 

Type of glue Glue consumption, g/m²  Time before gluing, open state, min. Compression pressure, kPa  Compression time
at 20°С at 40°С at 60°С
PVA glue, water dispersed 90-150, onto laminate or underlying plate 1… 30 100-300 8-60 min 4-12 min 45-160 s
PVA glue, two-component glues 90-150, onto laminate or underlying plate 1… 30 depending on components content 100-300 In accordance with producer’s recommendations
Glues on base of urea-, melamine-, urea-melamine-formaldehyde resins 90-150, onto laminate or underlying plate 1… 20 300-500 15-180 min 5-30 min 1-12 min
Depending on hardener system
Glues on base of phenol-formaldehyde and resorcinol resins 100-180, onto laminate or underlying plate 2… 15 150-500 ок. 8 час. Depending on hardener system
Contact adhesives
 with or without hardener
150-250, onto laminate or underlying plate Depending on ambient temperature and type of glue not less than 500 not less than 1 min  
Two-pack glues: epoxy, polyester, polyurethane 100-250, onto laminate or underlying plate Depending on the type of glue Pressure in pile, storage in horizontal position Depending on the type of glue and hardener  
Hot-melt glues 180-300, onto laminate or underlying plate Extremely short Pressure of the pressing roll 180-220°С Temperature of glue application

 

Закрыть x