FI74074B - FOERFARANDE FOER FRAMSTAELLNING AV OMSLAGSPAPPER ELLER LIKNANDE. - Google Patents

Description

74074

A method of making wrapping paper or the like

The present invention relates to a method for producing wrapping paper or the like according to the preamble of claim 1.

According to such a method, wood-free or wood-containing paper to one side of the desired pressure pattern and the second side surface may be moisture resistant coating.

The wrapping paper currently used in florists is made by printing shop signs and marks on sheets of polished paper quality in a so-called sheet machine. Such wrapping papers are well suited for their intended use, are decorative and prevent moisture from penetrating through the flower package.

However, their disadvantage is their high manufacturing costs. Made on Yankee cylinder machines, and printed on intermittent printing machines, the price of wrapping papers is initially high. The printing method used does not allow for more automation.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a completely new method for producing wrapping papers. The invention starts from the idea that wrapping papers can be made in a conventional offset rotary machine from ordinary paper grades by simultaneously pressing the desired pattern on the upper surface of the paper and a moisture-protective layer on its lower surface. The latter layer is preferably printed using a flat sheet metal, i.e. a so-called compact sheet metal.

More specifically, the method 2 74074 according to the invention is characterized by what is set forth in the characterizing part of claim 1.

The processing of printed sheets of paper after printing or, correspondingly, their pretreatment before this is known per se from the patent literature. DE-A-2 345 183 discloses a device adapted to an offset printing machine, by means of which it is possible to apply varnish, rubber solution or color to the surface of pre-printed sheets. The device according to GB Hacking Publication 2,046,173, in turn, can perform two post-processing operations simultaneously. Examples of such functions are numbered, overprinted, rubberized, perforated, and cut.

However, none of the publications discloses the above-mentioned solution for the production of a product suitable for wrapping paper or the like, in which a patterning and a moisture-insulating coating layer are simultaneously printed on the upper surface of the paper.

The invention provides considerable advantages. Thus, the wasted capacity of the newspaper offset rotation can be reduced and the waste paper rolls left over from newspaper printing are processed into wrapping paper sheets. The product made in this way fully meets the properties required of, for example, the wrapping paper of flower packages, but is nevertheless very affordable. In addition, the use of offset grain rotation makes pattern four-color printing possible.

The production of wrapping papers according to the invention is preferably carried out in an offset rotary rotary machine. The opposite printing rollers in the printing unit are fitted with printing plates in the normal manner, the one coming from the upper unit being intended for printing the pattern of the wrapping paper. The lower roll is provided with a flat sheet metal, i.e. a so-called compact sheet metal, which is usually used for printing color bases. The flat surface of the sheet 3 74074 substantially corresponds to the size of a sheet of paper. A solution for forming a moisture barrier is introduced into this damper in the normal manner. A mixture of varnish and varnish with about 30% by weight of varnish and the rest of the varnish can be used. Said composition corresponds approximately to the stock solution used in color printing.

The color roller is used to print the desired one-, two-, or four-color pattern on the top surface of the paper, and the bottom roller simultaneously applies a solution of varnish and varnish evenly to the entire bottom surface of the paper sheet. Uncoated areas may form at the edges of the paper sheet due to the clearance of a few millimeters between the edges of the sheet. However, these are irrelevant to the functionality of the product.

With the simple arrangement described above, wrapping papers of paper grades with a specific weight of 40 to 80 g / m2 can be produced in a standard offset rotary rotary machine. The dimensions of the papers, ie their height and width, vary depending on the machine used.

In the exemplary case, in the above machine, wrapping papers were made from wood-containing paper suitable for newspaper printing, which weighed 45 g / m 2. The sheets of paper had a height of 578 mm and a width of 400 and 800 mm, respectively. The solution used to form the moisture barrier contained 30% by weight of varnish and the rest of the varnish.

Within the framework of the invention, it is of course possible to consider solutions that differ from the above. Thus, by means of the invention, it is also possible to produce gift papers and other suitable sheets of paper. The solution according to the invention can furthermore be applied in other continuous printing machines, such as flexo machines.

Claims (2)

1. Process for producing a wrapping paper or the like wood-containing or wood-free paper, in which method one side of the pressure to the desired pattern, and the second side of the surface contacting the solution, preferably a mixture of varnish and the varnish, which forms a moisture barrier van layer, characterized in that the paper is pressed on two sides in a printing press using as a second printing plate a plate for printing the desired pattern and as a second, opposite printing plate a flat sheet (so-called compact sheet) by means of which said solution is applied to the surface of the paper. Method according to Claim 1, characterized in that the printing is carried out in an offset rotary rotating machine, preferably in an offset rotary rotary printing press. 1,