FI78656C - Plastic foil with anti-slip protection and its use as a covering d for wood sticks - Google Patents

Description

78656 1 Plastic film with sliding guard and its use as a protective cover for wooden stacks Plastic film with splints and anverting for the protection of wooden stacks 5

The invention relates to a plastic film with a slip guard.

10 In connection with the storage of timber, it is now customary to cover wooden stacks with a plastic cover to prevent the timber from getting wet. Such stacks of wood can have a very large length, e.g. 6 m, as well as a width of about 5 m and a height of 1.5 or 2 m. As a result, great efforts have been made to provide suitable sliding guards by profiling the plastic film or in some other way. However, the known plastic films for this purpose have not been able to sufficiently prevent the slip accident from occurring.

20 In previously known attempts to equip plastic films with a high-friction anti-slip coating in the form of a coating material layer, the achievement has been to achieve anchoring between the plastic foil and the anti-slip layer. Polyethylene film is most often used in connection with wood stacks, as such films have sufficient strength for the purpose. However, it is difficult to achieve sufficient adhesion of the second material to the untreated polypropylene or polyethylene film, which is natural in itself, since polyethylene and polypropylene are often used as a loose layer, e.g. in connection with asphalt products such as roofing cardboard.

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It is therefore an object of the present invention to provide a plastic film with better read protection than hitherto known plastic foils. Another object of the invention is to provide a plastic film intended for use as a cover for wood stacks.

The above objects are achieved according to claim 1, wherein the anti-slip device comprises a discontinuous coating layer consisting of a mixture of asphalt, aggregate and a mixture of ethylene copolymer and bitumen.

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According to the invention, the plastic film can be provided with a material with high adhesion and good read protection if this material consists of a special type of asphalt mixture, namely a mixture of asphalt, filler and a mixture of ethylene-butyl acrylate-10 copolymer and bitumen. Such an asphalt mixture can be applied to a plastic film, including a polyethylene or polypropylene film, maintaining a strong adhesion even under the low temperature conditions that may occur with the protective coverings of wood stacks. As the mixture of copolymer and bitumen, it is preferable to use a mixture of ethylene-butyl acrylate copolymer and bitumen sold by BASF AG, Germany under the trademark LUCOBIT * 1210, which according to the manufacturer's product is a plastic material consisting of an ethylene-butyl acrylate copolymer and a certain bitumen. This material has the properties of a thermoplastic material and can be extruded, injection molded and extruded with conventional plastic processing machines. The material is a tough elastic mass with high elongation and the brittleness range is below -30 ° C, while the softening range is between 80-100 ° C.

If such a copolymer, steam-distilled asphalt and filler, in particular talc, are mixed together, a coating composition is obtained which, in the warm state, can be applied to the polyethylene and / or polypropylene film in individual spots or strips. In connection with the coating, the free surface of the anti-read protection mixture can optionally be provided with a rolled layer of sprinkling material, in particular sand. However, this is not necessary. Suitable mixtures between asphalt, talc and said mixture of ethylene-butyl acrylate copolymer and eric colbitum may be

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be about 50 Z of asphalt, about 20 Z of talc and about 30 Z of LUCOBIT.

The mixture, which has proven to be particularly useful as a slip protection on wood stacks, contains 28 Z of LUC0BIT®, 19 Z of talc 11200 and 53 Z of asphalt B120 (i.e. a softening point of 45 ° C and a penetration of 120 mm / 10).

3 78656 ^ The accompanying drawing shows a schematic sectional view of a stack of wood covered with a plastic film according to the invention. Figure 2 shows a schematic view and a sectional view on a larger scale of parts of the sliding barrier fire of the film.

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Fig. 1 thus shows a wooden stack 10 covered with a film 11, in which the embodiment shown has read protection spots 12 at least in those parts of the film which form the upper running surface on the wooden stack. Figure 2 shows on a larger scale a section of this non-slip part of the film. The film 11 thus has elongated spots 12 of anti-slip material, and a thin layer 13 of sand or other scattering material is adhered to the surface of the anti-slip material 12 in the example shown. However, such a layer is not absolutely necessary, but it can be advantageous in terms of storing the film rolled up.

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Claims (7)

78656 h Plastic film with anti-slip device, characterized in that the anti-slip device (12) comprises a discontinuous coating layer (12) consisting of a mixture of asphalt, filler and a mixture of ethylene copolymer and bitumen. 1 Claims Plastic film according to Claim 1, characterized in that the film is an ethylene or propylene plastic film. 10 Plastic film according to Claim 1 or 2, characterized in that the anti-slip layer (12) has a surface coating (13) of scattering agent, in particular sand. Plastic film according to Claim 1, 2 or 3, characterized in that the asphalt is steam-distilled asphalt. Plastic film according to one of Claims 1 to 4, characterized in that the ethylene copolymer is a copolymer of ethylene and butyl acrylate. Plastic film according to any one of the preceding claims, characterized in that the anti-slip layer consists of a mixture of about 50% asphalt, about 20% filler and about 30% of said mixture of ethylene-butyl acrylate copolymer and bitumen. Use of a plastic film according to one of the preceding claims as a protective cover for wooden stacks. 30 35