KR20000016050A - Laminated sheet and manufacturing method of laminated sheet - Google Patents

Abstract

PURPOSE: A method of manufacturing a laminated sheet is provided to manufacture a laminated sheet including a sheet made with metal foil and paper. CONSTITUTION: A laminated sheet is manufactured by the steps of:adhering a sheet of a metal foil(3) with a sheet of paper(4) each other; printing an image on an outer surface of the paper; embossing the image on the metal foil; embossing a mirror of the image on the metal foil registered with the printed image if the image is printed on the paper previously; and printing the mirror of the image on the outer surface of the paper registered with the embossed image on the metal foil if the image is previously embossed on the metal foil.

Description

Laminated Sheet and Manufacturing Method of Laminated Sheet

Laminated sheets, such as those composed of metal foil and sheets of paper, can be used for a variety of functions, including wrapping or packing. Consumer goods such as sweets are often packaged individually or in bundles using laminated sheets, and cigarettes and cigars are often sold in bins or boxes with laminated sheets as liners. Laminated sheets are particularly useful as overlay layers because metal foils form barriers against light and moisture that can degrade tobacco quality.

Laminated sheets are often printed or embossed with an "image" or other information, such as a manufacturer's or distributor's trademark, logo or company name, to enhance the appearance of the product wrapped or wrapped with the laminated sheet.

Generally, laminated sheets are printed or embossed on only one side. Usually, it is printed on paper or embossed on metal foil, but sometimes it is also printed on metal and embossed on paper. Printing and embossing are performed by methods well known in the printing art, such as roll to roll embossing and engraved printing.

Although methods for producing laminated sheets comprising embossed metal foils and printed paper are well known in the printing and paper industry, it is desirable to produce laminated sheets in which the printing and embossing is in registration, i.e. the printed and embossed images are exactly matched. How to provide is not well known so far.

The present invention relates to a laminated sheet and a method for producing the laminated sheet.

In particular, the present invention relates to laminated sheets comprising a sheet of metal foil and paper and a method for producing the laminated sheets.

1 is a schematic diagram of a preferred embodiment of a process according to the invention for producing a preferred embodiment of a laminated sheet according to the invention.

FIG. 2A is a plan view of a metal foil surface of a laminated sheet produced by the process shown in FIG. 1. FIG.

FIG. 2B is a plan view of the paper surface of the laminated sheet produced by the process shown in FIG. 1. FIG.

3 is a cross-sectional view of the laminated sheet shown in FIGS. 2A and 2B.

Detailed description of the invention

In the process shown in FIG. 1, the metal foil 3 and the paper 4 are fed from each reel 1 and 2 so that the metal foil 3 and the paper 4 are stacked in series. Passed through the working place, the image is printed on paper 4 and the "mirror" image is embossed on the metal foil 3.

In connection with FIG. 1, the metal foil 3, which is usually silver aluminum foil, passes from the reel 1 on a coating roll 5 which applies the adhesive, preferably as a flat film, over a predetermined surface of the metal foil 3. do.

The metal foil 3 and the paper 4 from the reel 2 are two lamination rolls 6a which press the adhesive coated surface of the metal foil flat against a predetermined surface of the paper 4 to form a laminated sheet and Passed between 6b.

Next, the outer surface of the metal foil of the laminated sheet is colored by transferring the laminated sheet in contact with the gravure roll 7 applying the colored ink layer on the outer surface of the metal foil 3.

The wet ink is dried by passing the laminated sheet through a drying chamber 8 through which hot air is circulated.

The laminated sheet is then passed across the gravure cylinder 9, leaving an image printed on the outer surface of the paper 4.

Wet ink on paper is dried by passing the laminated sheet through another drying chamber 10.

The laminated sheet is then passed to an embossed site comprising a die 12b and a material 12a that emboss a “mirror symmetric” image of the image printed on the paper 4 on the metal foil 3. The control assembly comprising a sensor 11 upstream of the embossed work site detects the image printed on the paper 4 and prints the embossed "mirror symmetry" image on the metal foil 3 on the paper 4. The process is controlled by any means suitable for registration with the captured image.

Finally, the embossed and printed laminated sheet is fed to the large reel 13 for storage before the sheet is cut and wound onto smaller reels.

FIG. 2A shows the outer surface of some metal foil 3 of the laminated sheet produced by the above-described process in which an image 15 comprising an arrangement of the word “tobacco” is embossed. FIG. 2B shows the outer surface of the paper 4 of the laminated sheet portion shown in FIG. 2A. The outer surface of the paper is represented by a printed image 17 comprising an arrangement of the words "tobacco". The arrangement is consistent with the shape, size and position of the embossed and printed image.

FIG. 3A is an enlarged cross-sectional view of a portion of the laminated sheet shown in FIG. 2A, showing the metal foil 3 and the paper 4 held by each other by the adhesive thin film layer 18. The metal foil 3 has a stamping 19 which is produced by pressing the surface of the metal foil in contact with the embossed die. Since the embossing and printing coincide, the paper has an application of the ink 20 corresponding to the stamping portion 19 in the metal foil 3.

FIG. 3B is an enlarged cross-sectional view of a part of the laminated sheet shown in FIGS. 2A and 2B with the metal foil 3 and the paper 4 held together by the adhesive thin film layer 18. The metal foil 3 has a stamp 14 produced by pressing the surface of the metal foil without contacting the embossed die. Since the embossing and printing coincide, the paper has an application of ink 16 corresponding to the stamping portion 14 in the metal foil 3.

It should be noted that the particular image shown in FIGS. 2A and 2B can be arbitrarily selected and any suitable image can be embossed and printed on the laminated sheet.

It is an object of the present invention to provide a laminated sheet comprising printed paper and embossed metal foil, and to provide a laminated sheet in which the printed and embossed states are in registration.

It is a further object of the present invention to provide a method for producing the laminated sheet.

According to the present invention, a method is provided for providing a laminated sheet comprising the following steps.

i) adhering the metal foil sheet and the paper sheet to each other;

ii) printing an image on an outer surface of the paper; And

iii) embossing the mirror symmetric image on the metal foil in registration with the image printed on the paper.

According to the present invention, there is provided a method for producing a laminated sheet comprising the following steps.

i) adhering the metal foil sheet and the paper sheet to each other;

ii) embossing the image on the metal foil; And

iii) printing the mirror symmetric image on the outer surface of the paper in registration with the image embossed on the metal foil.

As mentioned above, the order of printing and embossing steps is not critical. However, it is preferable that the embossing step precedes the printing step.

It is particularly preferred that the method of the present invention comprises controlling the detection step first formed into the printed and embossed image and the subsequent embossed / printed step to ensure registration of the subsequently formed print and embossed image.

The step of attaching the paper and the sheet of metal foil to each other may be performed by any suitable method. In a preferred embodiment, the metal foil is passed onto a coating roller that applies an adhesive to the surface of one of the metal foils. The paper and metal foil are then passed between a pair of rolls that press the paper and the adhesive coated on the surface of the metal foil to form a laminated sheet.

The embossing step can be performed in any suitable step. In one embossing method, a workpiece (such as a roller) and an embossing die are placed on either side of the laminated sheet and drawn together so that the die contacts and embosses the foil. In another embodiment of embossing, the material is fixed and the die is moved up and down relative to the metal foil of the laminated sheet. In another embodiment of embossing, the material is moved against the paper of the laminated sheet to press the metal foil against the embossing die.

The embossing step acts as a material and acts as a roll and die formed from a relatively flexible material such as paper and feeds the laminated sheet between two rolls' nips such as another roll formed from a material such as steel It is preferable to include the step of.

The printing step can be carried out in any suitable way. For example, the printing step may include embossed or letterpress printing, flat printing or intaglio printing such as gravure printing or roll to roll gravure printing.

Laminated sheets of the present invention may have physical properties suitable for the intended use. For example, when trying to wrap a cake, the laminated sheet needs to be very flexible. Alternatively, when attempting to line the cigarette box, the laminated sheet may need to be relatively rigid to be folded and then folded.

Different physical properties of the laminated sheet can be provided to some extent by selecting the grade and shape of the adhesive and paper and / or metal foil.

It is preferred to include a metal foil selected from the main group of the periodic table.

In particular, the metal foil preferably comprises or consists of aluminum.

Optionally, the method includes coloring the metal foil. The coloring step includes a roll-to-roll gravure printing process in which the entire surface of the metal foil is colored by passing across an ink-gravure gravure roll. The coloring ink applied on the metal foil by the gravure roll can be dried by passing the metal foil through a hot air chamber or the like.

The invention is further described by way of example in conjunction with the accompanying drawings.

It is also believed that producing laminated sheets in which the embossed and printed "mirror symmetry" images are in registration is an important means by which buyers of products, such as tobacco, can distinguish products from other different merchants. In the tobacco industry, an important advantage is the ability to detect fake cigarettes.

Although the present invention has been described in connection with the preferred embodiment, those skilled in the art will appreciate that various changes may be made apparent upon reading the specification.

Claims (8)

a) attaching the metal foil sheet and the paper sheet to each other; b) printing the image on the outer surface of the paper; And c) embossing an image of the mirror symmetry on the metal foil in registration with the image printed on the paper Laminated sheet manufacturing method comprising a. a) attaching the metal foil sheet and the paper sheet to each other; b) embossing the image on the metal foil; And c) printing an image of mirror symmetry on the outer surface of the paper in registration with the image embossed on the metal foil Laminated sheet manufacturing method comprising a. The method according to claim 1 or 2, Detecting the first formed print and embossed image and subsequent subsequent embossed / printed steps to ensure registration of the subsequently formed print and embossed image. The method according to any one of claims 1 to 3, Passing a sheet of metal foil in contact with a coating roll applying an adhesive to a predetermined surface of the metal foil to form a laminated sheet, and a pair of nips and adhesives for pressing the paper together A method of manufacturing a laminated sheet comprising passing a sheet of paper and a metal foil coated with an adhesive between the coated metal foil. The method according to any one of claims 1 to 4, And wherein said metal foil comprises a metal selected from the main group of the periodic table. The method of claim 5, And the metal foil comprises aluminum or consists of aluminum. The method according to any one of claims 1 to 6, Laminating sheet metal manufacturing method comprising the step of coloring the metal foil. The method according to any one of claims 1 to 7, Laminated sheet produced by the above method.