CZ2844U1 - Surface treated flat paper-based layered material - Google Patents

Description

Technical field

The subject of the technical paper is a surface-treated paper-based sheet laminate, which is intended especially for the production of boxes.

BACKGROUND OF THE INVENTION

Currently, most paper boxes intended for use as packaging in a variety of industries are predominantly manufactured from conventional cardboard or cardboard, without any special coating. Virtually the only surface treatment is in most cases printing the box with the appropriate commercial, or. advertising information. Such a material is suitable for packaging products which, due to their nature, do not require special barrier properties of the packaging - in particular resistance to water and grease (greases), resp. impermeability to these substances.

If the above-mentioned barrier properties are required, it is mostly used in multi-part packaging, in external paper

v. .

a box of ordinary cardboard (carton), the product itself is stored in a second (inner) packaging - eg a sheet of polymeric material - that meets the requirement of barrier properties. The obvious disadvantage of this method of packaging is the increased material costs and the higher demands on working time in double packaging.

Therefore, methods of direct coating of paper, respectively. cartons for the boxes to ensure that the above barrier properties are met. In view of the large consumption of boxes and price range, this must not be an expensive or technologically demanding adjustment. This requirement is currently met mainly by the treatment of cardboard by so-called waxing. by direct impregnation of the cardboard with liquid wax or other similar material. Due to the nature of the resulting material, however, this treatment is intended for other types of products than boxes - especially for cups for liquid and paste products.

In general, therefore, because of the requirement of the aforementioned barrier properties, there is no known solution for surface treatment of conventional cardboard materials that would be optimal both financially and technologically and in terms of user properties of the obtained material.

The essence of technical re ^ e- ^ Γ

The surface-treated paper-based sheet composite according to the present invention contributes to eliminating the above-mentioned drawbacks. This sheet laminate, especially intended for the manufacture of boxes, comprises as a base layer a paper formation with a surface weight above 250 g / m ² , in particular cardboard with a surface weight of 400 to 900 g / m ² . The essence of the solution consists in that to this base layer at least one side is attached by means of an adhesive interlayer a paper covering layer of 60 to 120 g / m ² , which is surface treated with a layer of polyethylene of 10 to 60 g / m 2 ² ·

The adhesive interlayer may preferably be a polyvinyl acetate based adhesive layer.

The above-described sheet composite material has a very good resistance to moisture and grease (oil and grease resistance) due to the polyethylene deposit. At the same time, it is a completely hygienic material, suitable also for food products.

Examples are done by ^ T

In the exemplary embodiment, the surface-treated sheet composite material according to the exemplary embodiment comprises a base sheet having a basis weight of 600 g / m ² . A cover layer of paper having a basis weight of 80 g / m @ ^{2 is} laminated to this base layer. This paper is coated with a polyethylene coating of 20 g / m ² . The base paperboard layer is bonded to the paper overlay during lamination through a polyvinyl acetate based adhesive layer

From the described fertile material practically immediately after the lamination of the legs fertile cut-outs of boxes, which are then folded or glued to the final shape, are deemed suitable for the transport of fish, fruit, dairy products,

The inner part of the boxes is provided with polyethylene yield, so that the boxes of food goods - specifically, etc.

Claims (2)

H ARO Κ Υ '/ beer, 5-M based paper, pa) < . · Surface-treated surface - · layered material especially for production; krabic? ⁱ -obsáhuJ'ící ^J> as the basic 'PAP and tor layer formation; drawbar p 1 bang J weight i ^J load ¹ 250 g / a ² , especially cardboard with flat area. with a weight of 400 to 10,000 g / m @ 2, characterized in that the layer is at least one of the boundaries of the layer, the adhesive layer (s), the layer (s). '^' · Λίΐίίΐ ': · ^ · ~ ·' Ytýf77S ·: 'ŮA'i) <? '7. it: IsYy.Pv. Si: S ^; Paper having a basis weight of 60 to 120 g / m ² , which is coated with a polyethylene coating having a basis weight of 10 to 60 g / m ² . ' by being connected to this fundamental through A surface-treated sheet composite material according to claim 1, characterized in that. With the adhesive intermediate layer, the adhesive layer is based on polyvinyl acetate.