RU2740174C2 - Method for relief marking of shells - Google Patents

Abstract

FIELD: methods and devices for marking.

SUBSTANCE: method involves short-term contact of the shell with the relief of cylindrical printing forms of printing machines, part of the surface of which is coated with a layer of a liquid composition containing water, a thickener and a solvent for the polymer material of the shell, followed by drying, heat treatment and shrinkage. Heat-shrinkable polymer film is used as shell.

EFFECT: invention provides improved performance of method for relief marking of shells.

4 cl, 3 ex, 3 dwg

Description

The area of technology to which the proposal relates

The invention relates to methods of application and the media themselves, characterized by the selection of materials used in machines or machines for transferring digital information, and more specifically to methods for embossed marking of cable sheaths, various communications, tags, labels or brands of shrinkable polymeric materials produced by them.

State of the art

It is known that artificial casings for food products and machine parts are made of plastic materials (polyvinyl chloride, polyamides or cellulose ethers). These artificial casings are not eaten and must be removed before final consumption. In some cases, however, especially for large shells, they are subjected to a special process called "shirring" before being sold.

In the process of corrugation, the casing is wrinkled in an orderly manner, like folds of an accordion, to form a tubular corrugated surface structure (US Patent 2,983,949; USP 452/24; 452/27; 53/581 IPC A22C 13/02; A22C 13/00, published 16.05 .1961 and US Patent 5,782,683; USP 452/27; 138 / 118.1; 426/513; 452/21 IPC A22C 13/00; A22C 013/02, published 21.07.1998).

Known casings for food, which can transfer color to salted meat (US Patent 2,521,101; NPK US 426/250 IPC A22C 13/00, published 05.09.1950).

Plastic casings generally have low permeability to water and are generally impermeable to smoke, which is a disadvantage in the manufacture of smoked salted meat.

In inventions (Patent RF 2409189, IPC А22С 17/10; А23В 4/044; А22С 13/00 published 20.01.2011 Bull. No. 2 and US Patent 4,384,006; NPK USA 426/383; 426/87 IPC A47J 37 / 04; A22C 017/10; A23L 003/18, published 05/17/1983; use hot wire meshes that are brought into contact with the food product, pushed forward and rotated so as to form a continuous spiral mark on the surface of the sausage casing.

In the US patent (US patent 4,905,587; NPK US 99/534; 425 / 133.1; 452/35; 99 / 450.6; 99 / 450.7; 99/494; 99/516 IPC А22С 11/00; А22С 11/024; A22C 007/00 published 03/06/1990) apply a thin layer of liquid to the meat while it is stuffing into the casing and describe that this can be adapted for grill-type marking.

US Patent (US Patent 5,834,076; NPK US 428 / 34.8; 428 / 36.91; 426/412; 138 / 118.1; 428 / 36.9; 206/802; 426/135; 426/105; 426 / 129; 428 / 195.1 IPC A22C 13/00, published 10.11.1998) describe a method of marking casing for salted meat, on which marking signs, logos, texts or anagrams have been printed with a material that is impervious to smoke or coloring substances. When processing salted meat, the area of the casing, on which nothing is printed, allows smoking or coloring substances to penetrate into the corresponding part of the sausage, while the area of the sausage surface corresponding to the area of the casing, which is imprinted with the said impermeable material, remains without coloring agents.

There is also known a method of marking products, in which the following steps are carried out in the specified order: the product is given its final shape and size in a separate process, then the product is placed in a package having a pre-formed pattern, and the specified pattern is introduced at least temporarily with product to obtain marking on the product. When implementing this method, drugs, candy or chewing gum are used as the product, which must be solid or semi-solid. As a pattern, a template, which is a depression and / or a protrusion, and as a package, an extractable transparent package or material, preferably heat-sealable, containing a foil, preferably aluminum and / or polymer, such as polyvinyl chloride and / or polyvinylidene chloride ("Method product marking and product marked using this method ”, RF Patent 98106630, IPC B65D 85/72; B65B 61/26 published on 10.02.2000).

The disadvantages of this method are the need to use individual embossed patterns for each package, which should be applied or applied to and removed from it.

The closest in technical essence and purpose is the method of marking the casing, including the application of patterns or relief elements impermeable to water, steam and smoke, sediment and heat treatment on the part of the casing covering the food product, followed by dismantling of the templates or relief elements (Pat RF 2431407, IPC A22S 17/00, published 20.10.2011 Bull. No. 29).

The sediment is carried out for 0.5-48 hours, depending on the properties and dimensions of the natural casing, as well as the manufacturer's recipe.

Heat treatment is carried out at least one temperature regime or in three stages, with the temperature regime at each subsequent stage with increasing temperature.

After heat treatment, lighter areas of color are obtained on the surface of the food product in accordance with the location of the marking than the rest of the surface.

The disadvantages of this method are its periodicity, i.e. the need to use individual templates for each casing that should be applied and removed, as well as the duration of heat treatment and shrinking operations, which reduces the productivity of the marking process.

The essence of the proposal

The technical problem to be solved by the proposal is to expand the technological capabilities and increase the productivity of the method for embossed marking of casings of arbitrary length according to the "roll-to-roll" scheme by using various types of printing machines.

The problem is solved by the fact that in the known method of marking the shell, a heat-shrinkable polymer film is used as the shell, short-term contact of the shell with the relief of cylindrical printing forms of printing machines is carried out, part of the surface of which is covered with a layer of a liquid composition containing water, a thickener and a solvent for the polymer casing material, followed by drying, heat treatment and shrinkage.

In this case, the liquid composition contains as a solvent for the polymer shell material 30-80 mass. % tetrahydrofuran or 3-8 wt.% dimethyl sulfoxide, and when applying a liquid composition to the shell, printing equipment is used for gravure or flexographic printing.

Shrinkage on the product is carried out in the same temperature regime, but in two versions. The first option is heat treatment and shrinkage in a continuous marking process if a product (product, cable, communication) is found inside the shell at the moment the shell contacts the relief of cylindrical printing forms of printing machines. The second option is to carry out the operations of marking casings of arbitrary length according to the "roll-to-roll" scheme and storing the roll for subsequent transfer to the packaging line or e-labeling of products (containers). In the second variant, heat treatment and sediment are carried out after cutting the roll casing and applying it to the product (container) in applicators.

The proposal is illustrated by diagrams of operations for embossed marking of shells using printing equipment and a type of relief on the shell, as well as specific examples of the method.

FIG. 1. Scheme of operations for applying the "roll to roll" shell embossed marking using printing equipment.

1 - heat shrinkable sheath (film);

2 - container with a liquid composition (paint);

3 - air supply compressor;

4 - thermoelectric heater;

5 - cylinder supplying solution;

6 - anilox roll;

7 - heated printing cylinder;

8 - transporting shafts;

9 - roll on the shaft feeding the casing (film);

10 - a roll on a shaft receiving a casing (film) with hidden marking

FIG. 2. General view of the relief.

1 - heat shrinkable sheath (film);

17 - braille embossed element

FIG. 3. Diagram of operations for applying relief marking of heat-shrinkable labels using printing equipment and fixing on containers.

1 - heat shrinkable sheath (film);

2 - a container with a liquid composition (paint);

3 - air supply compressor;

4 - thermoelectric heater;

5 - cylinder supplying solution;

6 - anilox roll;

7 - heated printing cylinder;

8 - transporting shafts;

9 - roll on the shaft feeding the casing (film);

11 - container with glue solution;

12 - apparatus for folding a shrink film into a sleeve;

13 - an apparatus for pressing the glued seam of a sleeve of a heat-shrinkable film;

14 - device for cutting sleeves of a shrink film for the size of the container;

15 - heat treatment tunnel;

16 - container

Description of the method and mode of marking

Example 1. A method of applying relief marking on a shell for relief intermediate technological marking of protective shells of printed electronics elements (RFID tags) implemented on a conveyor for manual assembly of devices by workers with impaired vision.

To apply embossed marking on the shells, a heat-shrinkable polymer film of plasticized polyvinyl chloride is used. Short-term contact of the shell with the relief of cylindrical printing plates is carried out for 3 seconds using an intaglio printing machine (Fig. 1). The printing surface of a cylindrical shape is coated with a layer of a liquid composition containing water, a thickener and 60 wt.% Tetrahydrofuran, a solvent for the polymeric shell material - polyvinyl chloride. The casing is dried and heat treated with shrinkage (Fig. 2).

Example 2. A method of applying embossed markings on a shell according to example 1, but the cylindrical surface is coated with a layer of a liquid composition containing water, a thickener and 80 wt% tetrahydrofuran. The casing is cut into sections, enters the applicator, is applied to the container, and heat treatment with an air stream and shrinkage are carried out on the container in the applicator thermostat.

Example 3. A method of applying embossed markings on the shell according to example 1 for marking the handle of soldering irons, screwdrivers and wrenches for an assembly line operated by visually impaired and blind people. As the material of the shells, a shrink film of polyethylene terephthalate in the form of a sleeve is used. The operation of short-term contact of the shell with the relief of cylindrical printing forms of printing machines is carried out on a roll-to-roll screen printing machine. The cylindrical surface is coated with a layer of a liquid composition containing water, a thickener 30 wt% tetrahydrofuran and 5 wt% dimethyl sulfoxide.

After a short contact of the shell with the cylindrical relief of the screen printing and drying machine, the shell is cut into pieces equal to the length of the tool handle, put on the handles and sent to the thermostat for shrinkage and relief development (Fig. 3).

After heat treatment and shrinkage on the shells of the handles, a relief marking appears in the form of an inscription in Braille (Fig. 2).

Claims (4)

1. A method of applying relief marking on a shell, characterized in that a heat-shrinkable polymer film is used as the shell, short-term contact of the shell with the relief of cylindrical printing forms of printing machines is carried out, part of the surface of which is covered with a layer of a liquid composition containing water, a thickener and a solvent for the polymer material shell, with its subsequent drying, heat treatment and shrinkage. 2. A method of applying a marking according to claim 1, characterized in that the liquid composition contains, as a solvent for the polymer shell material, 30-80 wt.% Tetrahydrofuran or 3-8 wt.% Dimethyl sulfoxide. 3. A method of applying a marking according to claim 1, characterized in that, when applying a liquid composition to the shell, a printing equipment for intaglio printing is used. 4. The method of applying the marking according to claim 1, characterized in that, when applying a liquid composition to the shell, polygraphic equipment for flexographic printing is used.

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