Direct laminated floor

CA 02390174 2003-02-27

TITLE OF THE INVENTION

DIRECT LAMINATED FLOOR

BACKGROUND OF THE INVENTION

It is well known to hot press cellulose sheets (papers) impregnated in phenol or melamine (or similar-resins) with wooden boards or panels (plus other components specified by the manufacturer) to produce products such as boards, laminated boards, panels, and direct laminated floors that imitate wood, ceramic, and natural stone. Such imitation materials are mainly used for floors.

If melamine is used, and if the product is to have a single work surface (for example a floor), the melaminized board that comes from the press typically has a surface area between 3 and 8 square meters. Such boards are then cut into units (strips) approximately 1,200.times.200 mm. Each unit is beneficially tongued and grooved for ready installation. The result is a decorative and resistant paving that imitates wood, ceramic or natural stone.

Such known products have two significant defects:

1. They are not very wear resistant.

2. They do not closely imitate natural products (such as ceramic and wood).

The applicant has investigated reason why such products are not very wear resistant. It has been observed that premature aging (wear) begins at or near the perimeter edges and/or along tongue and groove lines.

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-2The known products have an even (level) surface texture such that the user, such as a pedestrian, treads (the soles of his shoes make contact) equally on the center of a tile on its perimeter edge. But, since the perimeter edge is the weakest area it deteriorates first.

The applicant has also investigated the reason for the second defect. He has reached the conclusion that if an imitation product is not a suitable imitation of a natural product, it is at least partially because the imitation's surface texture, both optical and tactile, have design errors.

In current products, a decorative surface effect is achieved by a design that is printed on an impregnated (by resin) paper. However, the surface texture of products with such printed designs is typically monotonous (flat) over the whole surface. This is because the press mold produces a flat surface.

Thus, while a surface design represents the different characteristics (line, color) of a natural product, the texture (relief) provided by the press mold does not match a natural product's surface level variations, both with regard to sight and to touch.

SUMMARY OF THE INVENTION

One object of the invention is to overcome the wear problem of products (tile, strip, board, etc.), which typically have a polygonal shape such as a rectangle or square. The object is achieved by providing a relieved perimeter. That is, a product's perimeter edge is contoured to be a few tenths of a millimeter below the rest of the product's surface. Thus, when a user treads on the product the user's soles do not

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-3rest on the perimeter edges. Likewise friction or wear caused by other agents coming into contact with the product is avoided.

Another object of this invention is to overcome the problem wherein a product's surface (such as that of a tile, a strip, or a board) is totally even or monotonous. This object is achieved by producing a product having a surface texture that corresponds and adapts to a printed design. The result is close optical and textural identifications with a natural product.

That is if, for example, a wood knot appears in a design the final product is adapted to that design by providing an area having a volumetric, conceptual, and physical correspondence, both visual and textual, with a wood knot. A similar thing happens if there is a wood pore, a stone roughness, or bubbles on a ceramic.

The foregoing is achieved using an exact correspondence-concordance between the image on the impregnated papers and the relief texture of a press mold.

Example,

a) Ceramic tiles in which the unions (joints) between tiles are relieved to produce a paving of earthenware ceramics;

b) Wood designs where the streaks, pores, and knots of a paper design coincide with the surface texture.

In short, products with a very marked surface texture that adapts and corresponds to the design on a resin impregnated paper. What is achieved is a more realistic affect than when the surface texture does not adapt and correspond to the design on a resin impregnated paper. Not only is an optical effect created, but also the different reliefs, which appear in the correct areas, can be touched.

CA 02390174 2006-05-08

-4Also, the product's life increases as relieved joints do not undergo wear. This is because the relieved joints are not contacted when being trod upon.

This invention advocates new direct laminated flooring of cellulose sheets impregnated with polymerizable resins and having design characteristics, and that, once pressed, have offset/sunk areas in peripheral edges.

This invention is also characterized because the optical/tactile texture of the surface of the floor, once pressed, corresponds and adapts to the characteristics designed on cellulose sheets.

The invention thus provides according to an aspect, for a laminated material comprising cellulose sheets impregnated with a polymer resin that are mechanically pressed and cut into a product, wherein the product includes a surface having a visual pattern, the surface having both a perimeter area having an edge contour and an interior region, and the perimeter area being relieved such that a portion of the edge contour is at a different height than the interior region.

BRIEF DESCRIPTION OF THE DRAWINGS

To understand this invention better, a preferential way of practical execution is illustrated on the drawings, which are subject to accessory changes that take nothing away from their basic content.

FIG. 1 is a plan view of a design on a resin-impregnated paper before a product with that design is pressed and cut.

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- 4a FIG. 2 is a plan viewof a product that uses the resin-impregnated paper of

FIG. 1, after that product is pressed.

FIG. 3 cross-sectional view taken along line A--A of FIG. 2.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

An example of a practical execution of this invention, but not a limiting

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-5one, is described below.

This type of product usually has cellulose cores impregnated by polymerizable resins (such as phenols), in particular by melamine. The core may include wooden sheets or other products, such as silica, that resist abrasion.

A product has a rim area, as illustrated in FIG. 1, which may be a different color than the remainder of the product. The rim gives rise to a relieved perimeter rim 1 after pressing (see FIG. 2).

Turning now to FIG. 2, the pressed product unit 4, which is to be used in a paving, has a perimeter rim 1 that is sunk below the rest of the surface S of the product unit. The perimeter rim 1 forms a joint 2 as shown in FIG. 3. The joint 2 can be formed using numerous procedures, for example, tongue and groove.

The (mechanized) cutting, or quartering, of the first board is performed by a press and can be done in units (strips) of, for example, 300.times.300 mm, or 400.times.400 mm, or 600.times.600 mm. Several units can be maintained together in blocks of, for example, 1,200.times.300 mm. (four units) or 1,200.times.400 mm (three units).

According to the principles of the present invention, the pressed board attempts to imitate another product. In the illustrated embodiment the product unit 4 imitates a ceramic, thus two deformities (a) and (b) that are similar to those of a ceramic are produced. It should be understood that the deformities extend normal to the surface of the product unit 4.

As ceramic tiles are usually butt joined with a small layer of cement, it will be seen that the perimeter rim 1 successfully imitates that of a ceramic tile, both by

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-6touch and sight. This is due to its offset, and possibly by adding a cement color to the design of the cellulose papers (of FIG. 1 ).

Turning now to FIG. 3, if a user treads between product unit 4 tiles the sole 3 of the user's shoe never reaches the perimeter rim edge (a).

It can be seen that once the characteristics (a.sub.1 ) and (b.sub.1 ) of the product to be imitated (ceramic) have been defined in the design drawing of a paper (FIG. 1), the volume-relief-texture (deformities) in the end product at (a) and (b), reference FIG. 2, correspond perfectly with respect to the position, concept, physical aspects, and volume to the design drawing characteristics (a.sub.1) and (b.sub.1) of 10 the product to be imitated.

In the specific case of the perimeter rim 1, those of a ceramic tile can be considered.

Further mechanizing (working) of the product (flooring) that comes from the press usually includes dividing it into units (strips) that are to be placed on a floor, 15 and in providing the units (if necessary) with connection means, for example, tongue and groove features.

This mechanizing is not the object of the invention.