DE102011106537A1 - Producing curved composite glass body formed from flexible, laminated thin glasses, by separating superimposed thin glasses by a curable adhesive layer, stretching a stack of thin glasses to bearing surfaces, and curing the adhesive layer - Google Patents

Abstract

The method comprises separating two superimposed thin glasses (2) by a curable adhesive layer (3), stretching a stack of thin glasses to bearing surfaces (9), and curing the adhesive layer by an irradiation of electromagnetic radiation such as light including UV, visible or infrared light, by microwave or radio waves or by electrons. The thin glasses are flexible even at room temperature, and are coatable in a plane state. An independent claim is included for a composite glass body.

Description

1. State of the art

Transparent printing cylinders made of quartz glass, z. For example, for the SAIL method of the Hewlett-Packard Research Labs, wherein UV radiation is radiated through the cylinder into the printing substrate. From the so-called functional contact pressure are known tasks in which it depends on extreme accuracies in the cylinder and substrate guide, not only to accurately reflect certain patterns, but also to tensions that break z. B. a glass gravure printing could lead to avoid.

Firstly, the creation and processing of the above transparent cylinder is very expensive; secondly, these cylinders should be small for laboratory applications - 8 cm inside diameter at 16 cm height or less - so that the space for measuring or blasting equipment is limited and also the thermal management of such cylinders z. B. may be demanding in photochemical tests; Third, cylindrical printing plates can only be processed on special machines, for. B. in a laser engraving machine according to the prior art.

Shock absorbing bearings are known, the z. B. have an annular elastomer layer; These are referred to in this document as a rubber bearing. Magnetic bearings are known which stabilize a preferably ferromagnetic axis by a suitable arrangement of permanent magnets or electromagnets.

We are looking for a cost-effective method for producing transparent, more accurate and smooth printing forms whose surface would be easily editable with as many known methods of the prior art as possible; These printing plates would be used in devices that reduce the risk of printing form breaking.

2. Description of the invention

The invention described below achieves the above object with a method according to claim 1 and a printing form according to claim 4. Further features of the invention are laid down in the dependent claims.

2.1 Description of a preferred embodiment

1 shows schematically and preferably, a frame ( 4 ), which consists of two sector discs ( 8th ) having an axis of rotation, which two bearings ( 5 ), and those with a number of struts ( 7 ) are connected. In this case, the sector discs ( 8th ) each have a precisely part-cylindrical worked bearing surface ( 9 ), where both surfaces ( 9 ) conform to a cylinder whose axis coincides with the axis of rotation above.

The two surfaces ( 9 ) a support surface for a composite glass body ( 1 ), which preferably takes the form of a cylindrically curved rectangle. Preference is given to the preparation of ( 1 ) first cut as a flat rectangle of thin glass. Then, in at least one further step, a next congruent flat thin glass is cut out and an adhesive layer is applied to the penultimate cut thin glass ( 3 ), preferably ( 3 ) after curing is judicious. Then the next thin glass is applied. This process can also be done several times. Now the thin glass stack is bent and so with ( 9 ) contacted that the last applied thin glass on ( 9 ), whereby preferred ( 9 ) has small steps on the edge, which take into account the gradations of the after bending. Preference is given ( 1 ) with a precisely adapted sector-shaped clamp ( 6 ) on ( 9 ).

Preferably, any processing of the first thin glass on the non-adherent side, z. B. mechanically or as a coating or as surface functionalization.

Preference is given ( 3 ) after the application of ( 1 ) on ( 9 ) Hardened, z. B. by irradiated from one or both sides UV light.

After curing forms ( 1 ) a composite glass body according to the invention, whose one cylinder-shaped curved outer surface is stretched, while the other cylindrically curved outer surface is compressed.

2.2 Further embodiments of the invention

Conceivable are differently designed frames ( 4 ), provided they have a number of contact surfaces ( 9 ) such that the outer surface of a composite glass body applied to this number of surfaces ( 1 ) assumes a partially cylindrical shape. It is also conceivable that when applied to surfaces ( 9 ) that do not conform to a common circular cylinder, ( 1 ) assumes a different shape than that of a pitch cylinder.

Preferably, the stretched outer surface of ( 1 ) are processed by chemical, electrochemical, mechanical, plasma or other vapor deposition, for. B. to create a gravure pattern. The resulting pattern can z. B. conductive, or magnetizable, or locally (eg., By infrared radiation) selectively heatable, or hydrophilic / hydrophobic. In this case, the thin glass can be provided with suitable patterns of sacrificial materials.

Preferably, this processing is carried out as described above, on the non-bonded side of the first thin glass, which then the stretched outer surface of ( 1 ). Preferably, after bending ( 1 ) whose stretched outer surface is provided with a fluid, according to the invention curable coating, which penetrates into microcracks of the outer surface, which arise during bending, so that ( 1 ) is better protected against fractures. Both ( 6 ) as well as the thin glasses ( 2 ), z. B. by laser processing, provided with edge perforations and ( 9 ) has z. B. suitable pinion teeth to the exact application of ( 1 ) on ( 9 ) to support. Conceivable are large-area partial cylinders ( 1 ), z. B. formed from thin glasses for the display industry, wherein ( 1 ) is curved in a partial region in the manner of a cardioid so that ( 1 ) on ( 4 ), z. In addition to ( 6 ), with one to the axes ( 4 ) parallel clamping device kink-free fastened. Thus, a usable in a roll process printing cylinder can be formed.

Preferably, a camera may be mounted so that z. B. with suitable transparent and fluorescent pigmented colors, hydrodynamic measurements of the color jump of ( 1 ) can be measured on a substrate; Likewise, the viscosity of a z. B. in the polymerization conceived printing ink are measured with suitable fluorescent additives as a two-dimensional dynamic pattern, preferably in the printing line.

Preferably ( 4 ) are provided with part-cylindrical curved guides, so that the bearings ( 5 ) and the rotation of ( 4 ) 1 ) becomes more accurate about the common axis. Camps ( 5 ) can be designed as a rubber bearing or magnetic bearing, so z. B. shocks are cushioned.

The inventive composite glass body can also be used in other areas outside the printing technology, for. B. as a UV embossing tool.

3. Advantages of the invention

The invention preferably allows the cost-effective production of transparent printing plates, which are mechanically stronger than similar formed from solid glass printing plates. It opens up a series of coating processes for such printing plates which deposit on flat surfaces and, even with small partial cylinder diameters, permits an observation of the processes in the printing line which is improved over closed cylinders.

Claims (6)

Method for producing a bent composite glass body ( 1 ), from a number of flexible, laminated thin glasses ( 2 ), characterized in that - ( 2 ) is flexible at room temperature, and that - ( 2 ) is coatable and workable in a flat state, and that - in each case two superimposed thin glasses ( 2 ) by a curable adhesive layer ( 3 ) and that - the stack of thin glasses ( 2 ) on a number of bearing surfaces ( 9 ) is clamped and cured. Method according to claim 1, wherein the outer surface of the composite glass body ( 1 ) is coated after clamping on the mold. The method of claim 1, wherein the curing of the adhesive layer ( 3 ) by irradiation of electromagnetic radiation, preferably of light, for. B. of UV, visible or infrared light, or of microwaves or radio waves, or of electrons occurs. Composite glass body ( 1 ) made in a method according to any one of the preceding claims and which is transparent after curing. Composite glass body ( 1 ) coated with at least one coated or processed thin glass ( 2 ) is provided. Composite glass body ( 1 ) according to claim 4, which is used in a printing process, wherein ( 1 ) around warehouse ( 5 ), which perform the elastic suspension of an axle, like a magnetic or rubber bearing, and wherein ( 4 ) may include a number of partially cylindrical guide notes.

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