DE102007049482A1 - Stamping- and micro-stamping device for e.g. paper, has stamping arrangement mounted on preheating furnace of product/laminate, which is wound by winding coil and is packed for later utilization so that complete stamping cycle is considered - Google Patents

Abstract

The device has a stamping arrangement (1) mounted between a coil (A) and a winding coil (B). The arrangement is formed by a master cylinder (2) and a pressing cylinder (3), which is made of elastic material e.g. rubber. The arrangement is directly mounted on a preheating furnace of a product/laminate (L), which receives a reciprocal thermal shock after stepping through the arrangement, where the thermal shock is exerted by a cooling cylinder (R). The product/laminate is wound by the winding coil, and is packed for later utilization so that a complete stamping cycle is considered. An independent claim is also included for a method for stamping and micro-stamping on a product.

Description

FIELD OF USE

The The present invention is concerned with an embossing and microembossing process and the like Devices with the larger part of flexible products and materials can be used used in the printing industry, being a unique one engraved heated cylinder is used; the operating procedure is simple, which allows its immediate use, wherein the cylinder with the back pressure of a Anpresszylinders with Printing machines is coupled, whereby a large economy is generated and results not yet revealed in the market, in particular in relation to micro-embossing in flexible laminate products; the newly introduced procedure applies to Rotationsprägebereiche in the fields of rotogravure and flexographic printing, those in the printing sector of rotary printing in flexible packaging articles, decorative films, Finishing industries for flexible plastic, extruded (plastic) and laminate (glue plastic assemblies) products are included; the newly introduced Procedure has the goal to different products of the printing industry of flexible films and carriers to provide a decorative effect and / or protection against cloning, where it acts as a security element.

STATE OF THE ART

As Is known to printing professionals, embossing is one of the existing forms, Graphics in high or low relief on products, e.g. Paper, Plastic and the like, to mark.

she is a conventional one Engraving process, which is in the corporate segment of rotogravure printing and flexo printing in particular in printing systems with a rotating feature is used.

More accurate said the currently used embossing method puts the possibility a plane surface stamping (stamp and die) or double rotation stamping (punch and die) ahead.

The Flat surface embossing process (Punch and die) uses stamping plates in zinc or photopolymer, which are engraved by spark erosion or chemical methods. He is for through paper and cardboard sheets supported Printing industry determined. Its operation requires a complicated system rotating or planing presses for rotogravure, flexographic printing and offset printing process. It can also be used for cutting and folding operations become.

The Double rotary embossing system (Stamp and die) includes two steel cylinders in high and low Deep relief (stamp and die) are engraved. Both cylinders must be with Gear and synchronized work. The same cylinder arrangement can also by a steel cylinder (stamp) and another Press paper cylinder (die) to be formed. This system is to Determines graphics in high and / or low relief on products or flexible packaging items to mark the paper, cardboard, aluminum paper, metal paper, Aluminum, etc. as a carrier use. Some examples of their uses include the packaging segments for: beer labels, Yoghurt lids, cigarette packs, toilet paper, etc.

in the Market are the existing embossing machines generally known, which serve the main purpose of this engraving system, normally equipped with two rollers or cylinders, using a cold stamping process to enable. Such is true, e.g. For machines, which are in the documents of the Find a PI0504521-5 patent foreseeing a machine where one Plate material embossing arrangement at least two embossing rolls includes, the outermost ends are rotatably mounted on the side panels of the embossing machine. Each side panel is in a fixed part and at least one divided movable part.

consequently It may be noted that normal embossing procedures essentially envisage a machine where the product to be marked, in the General paper, plastic and the like, between two rotating Cylinders (punch and die) passes through and simultaneously with Controlled the embossing equipment being, with a centesimal precision between the two cylinders is required to get the desired graphics to characterize the product.

Other general characteristics of the stamping equipment the fact that rolls usually have a shaft with one Geared slot having the fit between them possible and that allows a sufficiently strong precise pressure, to the product with a quality so that it does not dissolve into its components.

Some Disadvantages in the conventional embossing process can thereby be shown, such. the one with stamping plates goes along because they have many restrictions on the market of flexible packaging because they only work with plate material that is not continuous embossing process without seams allows.

Another disadvantage of this method is the limitation to the carriers of paper and cardboard. The determination of the relief, the obtained by this method is limited to coarser images that do not allow fine micro detail images (micro-engraving).

A other unfavorability encountered in the conventional embossing process, refers in particular to the double embossing system (punch and die), because its application in relation to the possible stamping on paper, cardboard and Aluminum limited is. The types of graphics engraved on the system cylinders can be are quite varied but do not support micro details.

One greater Disadvantage of this system is that the group of cylinders with gearbox and work synchronized. This restriction makes it incredibly difficult Graphics, i. the cylinders to change. The loss of synchronization often makes it technically and / or financially impossible to make the switch and even if done, it can take days or weeks, depending on that Case and machine dimensions. Another important unfavorability of the conventional double embossing system is the impossibility of the system, plastic materials such as BOPP, polyester, PVC, to shape polyethylene, which are considered flexible materials.

BRIEF DESCRIPTION OF THE INVENTION

While he on the improvement of the pressure segment, in particular the process or the double embossing system, aimed, developed in the development area of equipment and appropriate procedures Applicant the present unique embossing and micro embossing method, that on rotary embossing used in the fields of rotogravure and flexographic printing becomes where a conventional Machine now use a single cylinder with a steel body can, which has been referred to as master cylinder, to the one Metal, plastic cover or the like are attached can. On the surface of the steel cylinder or a corresponding cover can several Types of graphics and / or textures in high and / or low relief engraved be found; Engraving these graphics is by chemical etching or laser sublimation.

A from the corresponding advantages in terms of the fact that one on the surface of the Master cylinder attached cover is used, is the fact that among other functions the body of the cylinder is used again can be after the graphic and / or texture on it surface is engraved, worn out.

consequently it is with the use of covers made of copper, nickel, Chromium, rubber and specific plastics are manufactured, possible, the body to reuse the cylinder for worn or damaged graphics to re-engrave, or even new graphics and / or textures too engraving. This attachment of the cover over the master cylinder is according to standards or durability against abrasion, durability and hardness selected.

Of the engraved master cylinder works together with a smooth rubber cylinder, which are both subjected to pneumatic or hydraulic pressure. The said rubber cylinder is due to its hardness and resistance selected against abrasion, wherein these characteristics are also determined in relation to the material to be embossed.

Of the engraved master cylinder is subjected to heating, the Temperature of the to be embossed Material depends; heating can be generated in several ways, e.g. by electric Resistance, Oil, Water or any other method that generates a corresponding heat.

one the advantages of the present embossing and Micro embossing process concerns the fact that it is the embossing of most of the flexible Allows materials, which are used in the printing industry, with only one engraved Cylinder is used.

Compared with conventional Procedure, the newly introduced Procedure with respect to several technical points, wherein the most important of them is the fact that only one engraved Cylinder is used without requiring synchronization is because it uses no other steel cylinder. This improvement allows a high speed stamping, because there is no synchronization between the engraved cylinder and the Rubber cylinder needed.

One Another innovation point concerns the fact that uses heat is used to heat the master cylinder while the conventional double embossing Cold process is.

The enables new procedures that graphics are so shaped be aligned with the graphics, those on the carrier printed (already printed material to be embossed should).

Another advantage over the conventional method is that the new method is functionally simplified, allowing its use in direct coupling with printing machines that operate or do not work in Pro production lines, or to produce an accurate alignment with the printed material, thereby producing efficiency, great economy and achieving results not yet disclosed to the marketplace, in particular with respect to micro embossing of flexible laminates.

one the main points that enabled that the result obtained by the process in question was the Predicting an adaptation in relation to conventional machines, what the Master cylinder and other devices of the present method turned into a multifunctional device, which is capable of adapting itself to multiple machines to shape the multiple materials by the printing industry for flexible films and paper are produced. The solution found included a combination of temperature, speed, pressure, pretreatment and post-treatment of the laminate product and hardness between the engraved cylinder and the rubber cylinder used in the new Method is used.

DESCRIPTION OF THE DRAWINGS

Around to supplement the present description for a better understanding the features of the present invention, and according to a preferred practical realization is the description by accompanied by a set of drawings, where on an exemplary non-limiting way the following has been presented:

1 represents the newly introduced embossing process which is generally used in a schematic embossing machine of laminate products.

DETAILED DESCRIPTION OF THE INVENTION

Corresponding the listed Illustrations, the present invention relates to a new embossing and microembossing and a related device, and more specifically, it is concerned with a stamping process of the type used in the rotary embossing areas in the areas rotogravure and flexographic printing is used.

According to the present Invention is the embossing process at a printing range of rotary printing for the production of flexible packaging items, Decorative films, finishing industries for flexible Plastic, extruded (plastic) and laminate (glue plastic assemblies) products and in the most diverse products of the printing industry of flexible foils and straps used as a decorative element and / or protection against Cloning (as a security element) act.

• a) Zwischen einer Spule (A) mit dem zu prägenden Produkt/Laminat (L) und einer Wickelspule (B) wird die Prägeanordnung (1) montiert, die durch einen Masterzylinder (2), der möglicherweise erwärmt wird, und einen Anpresszylinder (3) von elastischem Material, vorzugsweise Kautschuk, gebildet wird;
• b) Die Anordnung (1) von Zylindern (2) und (3) ist in einer bevorzugten Konstruktion unmittelbar nach einem Vorheizofen (E) des Produkts/Laminats (L), das sich schon im Abwickelverfahren befindet, montiert; ein Vorheizen wird entsprechend dem Typ von zu prägendem Produkt angewandt. Es ist nicht notwendig, das Vorheizen auf eine allgemeine Form aufzubringen;
• c) Das Produkt/Laminat (L) kann nach Hindurchtreten durch die Prägeanordnung (1) einen umgekehrten Thermoschock erhalten, der durch einen Kühlzylinder (R), der keinem Druck ausgesetzt ist, ausgeübt wird; der umgekehrte Thermoschock ist wie das Vorheizen nur im Fall von spezifischen Produkten notwendig und ist nicht notwendig, um diese Stufe des Verfahrens zu verallgemeinern;
• d) Das Produkt/Laminat (L) wird in der Spule (B) wieder aufgewickelt und zur späteren Verwendung verpackt, wobei der beendete Prägezyklus berücksichtigt wird.

The method consists of the following steps, which are applied to an embossing machine (M):

• a) Between a coil (A) with the product / laminate (L) to be embossed and a winding bobbin (B), the embossing arrangement ( 1 ) mounted by a master cylinder ( 2 ), which may be heated, and a pressure cylinder ( 3 ) is formed of elastic material, preferably rubber;
• b) The arrangement ( 1 ) of cylinders ( 2 ) and ( 3 ) is mounted in a preferred construction immediately after a preheating furnace (E) of the product / laminate (L), which is already in the unwinding process; Preheating is applied according to the type of product to be embossed. It is not necessary to apply the preheating to a general form;
• c) The product / laminate (L), after passing through the embossing arrangement ( 1 ) receives a reverse thermal shock, which is exerted by a cooling cylinder (R), which is not subjected to pressure; the reverse thermal shock, like preheating, is only necessary in the case of specific products and is not necessary to generalize this stage of the process;
• d) The product / laminate (L) is rewound in the bobbin (B) and packaged for later use, taking into account the finished embossing cycle.

The master cylinder ( 2 ) may represent an engraved surface with graphics and textures (T) to be imprinted on the product / laminate (L), or it may be provided with a sleeve ( 4 ) of corresponding material, such as sheet material of copper, nickel, chromium, rubber and specific plastic products, are covered with engravings of graphics, textures and microtextures (T); the case ( 4 ) can be applied by means of adhesive, vacuum or any other type of adhesion to the master cylinder ( 2 ) to be appropriate.

The jacket cover ( 4 ) on the master cylinder ( 2 ), can be removed for new engravings from worn or damaged graphics or even for new graphics, textures or microtextures (T). The application of a layer ( 4 ) on the master cylinder ( 2 ) is selected according to standards of resistance to abrasion, durability and hardness.

The master cylinder ( 2 ) receives a heating that can come from several systems, such as electrical resistance, oil, water or any other device that generates a corresponding heat to the surfaces temperature in a range that can vary between 40 and 180 °. The temperature is determined according to the resistance of the product / laminate to be embossed (L) and according to the production rate and pressure available in the cylinder assembly.

The pressure cylinder ( 3 ) is smooth and should have a controlled hardness that provides pressure over the master cylinder ( 2 ) and the product / laminate (L) to be embossed. A surface pressure above the master cylinder ( 2 ), which by the Anpresszylinder ( 3 ) is controlled by a pneumatic, hydraulic or mechanical system.

The order ( 1 ) of cylinders ( 2 ) and ( 3 ), when attached to the embossing machine (M), does not require equal diameters since they do not require any synchronization.

The embossing and micro-embossing method has as its greatest advantage the possibility to use most of the flexible materials used in the printing industry with the use of only one engraved cylinder or master cylinder ( 2 ) to shape it.

The embossing arrangement ( 1 ) allows application to various flexible products (L), such as paper, aluminum, plastic, and also has as a different importance the embossing application in low and / or high relief on flexible plastic films, for which it is due to the fragility, sensitivity and the Structure memory of the material gives no similar process. Flexible films can be extruded (cast) into individual layers or glued into multiple layers, which in this case are usually referred to as laminates. Examples of flexible films are, but are not limited to, polyester, BOPP, polyethylene, PVC, polypropylene. The corresponding method can also be used for leather, film papers, fabrics and any other type of film.

The embossing process includes, as already mentioned, the possibility, the micro-embossing perform, what the marking in low and / or high relief of micrographics or optical effects for generating the indication of origin of the product allows which represents a "security code" to the Identify the packaging and automatically promote the product, which acts as an anti-cloning or anti-piracy code.

The present invention of embossing or microembossing process limited their application is not limited to the details and stages that are described hereby are. It is another embodiment capable and can be practiced or performed in a variety of fashions, and it is understood that the terminology used a descriptive non-limiting Purpose.

Claims (14)

Embossing and micro embossing method and apparatus therefor having an embossing method applied to rotary embossing areas in the fields of rotogravure and flexographic printing, more particularly in the printing area of rotary printing for the production of flexible packaging, decorative films, flexible plastic converting industries, extruded (plastic) laminate ( Glue plastic assemblies) products and other diversified products of the printing industry of flexible films and supports; characterized in that the method comprises the following steps applied to an embossing machine (M): a) between a reel (A) with the product / laminate (L) to be embossed and a reel spool (B) the embossing arrangement ( 1 ) mounted by a master cylinder ( 2 ), which can be heated, and a pressure cylinder ( 3 ) is formed of elastic material, preferably rubber; b) The arrangement ( 1 ) of cylinders ( 2 ) and ( 3 ) is optionally mounted immediately after a preheat oven (E) of the product / laminate (L), which is already in an unwinding process; c) The product / laminate (L), after passing through the embossing arrangement ( 1 ) optionally receive a reverse thermal shock applied by a cooling cylinder (R) which is not subjected to pressure; d) The product / laminate (L) is rewound through a bobbin (B) and packaged for later use, taking into account the finished embossing cycle. Device according to claim 1, characterized in that the master cylinder ( 2 ) is made of steel, presenting an engraved surface with graphics and textures (T) to be embossed onto a product / laminate (L). Device according to claim 1 and in a constructive option, characterized in that the master cylinder ( 2 ) with a shell ( 4 ) of corresponding material, such as plates made of copper, nickel, chromium, rubber and specific plastic materials, is covered with graphics, textures and microtextures (T); the case ( 4 ) can be applied by adhesive, vacuum or any other type of adhesion to the master cylinder ( 2 ) to be appropriate. Apparatus according to claim 3, characterized ge indicates that a cover layer ( 4 ) for engraving worn or damaged graphics or engraving new graphics, textures or microtextures (T). Device according to claims 3 and 4, characterized in that the material of one of the master cylinder ( 2 ) applied layer ( 4 ) depends on a product / laminate (L) selected according to parameters of resistance to abrasion, durability and hardness. Device according to one of the preceding claims, characterized in that the master cylinder ( 2 ) receives heating that can come from a variety of devices, such as electrical resistance, oil, water, or any other device that generates appropriate heat to maintain the surface temperature within a range of 40 to 180 degrees. Device according to one of the preceding claims, characterized in that the on the master cylinder ( 2 ) applied temperature according to resistance parameters of the product / laminate to be embossed (L) and according to the production speed and the pressure in the arrangement of cylinders ( 2 ) and ( 3 ) is determined. Apparatus according to claim 1, characterized in that the pressure cylinder ( 3 ) is smooth. Device according to claims 1, 2, 3 and 8, characterized in that the pressure cylinder ( 3 ) has a hardness and an exerted pressure, which are controlled when it comes into contact with the master cylinder ( 2 ) and the product / laminate (L) to be embossed; where the surface pressure on a master cylinder ( 2 ), which by the Anpresszylinder ( 3 ) is controlled by a pneumatic, hydraulic or mechanical system. Device according to one of the preceding claims, characterized in that the master cylinder ( 2 ) one of the diameter of the pressure cylinder ( 3 ) may have different diameters. Device according to one of the preceding claims, characterized in that an arrangement ( 1 ) of cylinders ( 2 ) and ( 3 ) does not require any synchronization. Method according to one of the preceding claims, characterized in that the embossing and micro embossing process only an engraved cylinder or master cylinder ( 2 ) used. Method according to one of the preceding claims, characterized characterized in that the method allows the embossing and / or micro embossing in low and / or high relief on different flexible products (L), such as Paper, aluminum, plastic material, extruded (molded) flexible plastic films, in single layers or glued in several layers (laminates) and also leather, layer papers, Tissue and any other type of foil is applied. Method according to one of the preceding claims, characterized in that the micro-embossing method associated with the arrangement of cylinders ( 2 ) and ( 3 ) which allows deep and / or high-relief marking of micrographics or "security code" type optical effects.