Abstract: A metering valve for delivering pasty mediums includes a valve housing having an inlet opening and an outlet opening, with a variable flow restrictor therebetween. The flow restrictor has one or more holes for connecting the inlet opening to the outlet opening. At least one hole can be intermittently placed between the inlet and the outlet to reduce the effective cross section of the hole.

Abstract: A valve arrangement includes a valve housing and a closing element movably arranged within the housing. The housing has a cylindrical bore a lateral inlet opening, an axial outlet opening, and a valve seat arranged axially at a distance away from the inlet opening. The closing element includes a sealing section adapted to seat against a valve seat so as to block fluid flow through the outlet, and tapered portion which defines a rotationally symmetrical circumferential distribution space between itself and the bore.

Abstract: Photochromic printing inks are disclosed which are in particular used for the printing of security documents. Prints are normally nearly colorless and become colored when energy irradiated, such as by ultraviolet light. This photocoloration is reversible. The printing inks contain photochromic compounds which are protected against other ink components. Methods are described to prepare the inks, to print security documents, and to detect counterfeiting.

Abstract: A printing ink for the printing of security documents by the method of engraved steel die printing, having a viscosity of at least 1 Pa.multidot.s at 40.degree. C. under a shear of about 1000 sec.sup.-1, containing a binder matrix, a polymerization initiator for polymerizable matrix components, fillers and pigments, and the usual additives. The binder matrix contains at least one cationically polymerizable compound, modified to bring about the desired rheology of the ink, and the photoinitiator, activable by UV, heat and EB, is an onium salt capable of releasing a Lewis or Bronsted acid.This ink has best and very rapid drying characteristics.

Abstract: The liquid colorant dispersion intended to be incorporated in plastic materials prior to their transformation and intended to color in bulk these plastic materials comprises a vehicle principally comprising a terpene oil based on pinene and colorant materials. An ethoxylated alkylphenol and other surface-active constituents selected from the group comprising sodium dioctylsulfosuccinate, sodium benzoate, fatty acid condensates, phosphoric ester and alkylpolyalkoxylate may be added to the vehicle. This dispersion compatible with conventional polymers permits obtaining products of a homogeneous coloration, without surface alteration and without distortions.

Abstract: A method and apparatus for authenticating documents, utilizing the ferroelectric properties of poled polymeric materials. The properties displayed by the poled materials are detected in order to authenticate the documents to which they are affixed. The poled polymeric material can be used as a protective coating or covering for an indentifying photograph and/or signature and can be applied to a document in such a fashion that heat is needed to remove it. The ferroelectric properties of the poled polymeric material virtually disappear when the material is subjected to critical temperatures, such as those necessary to remove the material from the document. The absence of these properties therefore, signifies that the document has been tampered with.

Abstract: The transfer sheet or web is intended for the use in a heat transfer printing process of cotton, of cotton-polyester blend or of nitrogen containing textile fibers such as wool, silk or nylon.It comprises on its surface at least one organic impregnating agent which has a melting point between 60.degree. and 230.degree. C. and is no polymer, at least one water insoluble, non-subliming dyestuff, and the minimum amount of a binder. The dyestuff forms a pattern or image which is heat contact printed on said textile substrate without the use of carrier vapors or vacuum. The pattern to be heat transferred may also be prepared in an electrophotographic process using a new toner comprising particles of impregnating agent, binder and dyestuff.The pattern on the transfer support is transferred at a temperature between 160.degree. and 230.degree. C. during 30 to 60 seconds to said textile substrate. The printings obtained have very good light, rubbing and washing fastnesses; the handling is not impaired.

Abstract: A method for preparing a flexographic or gravure printing ink in dry, powdered form. The method comprises comminuting a blend of all ink components, the solvents excluded, under oxygen free and temperature controlled conditions. The powder obtained is homogeneous, dust free, solid, dry and free-flowing and provides a ready-for-use printing ink on simply stirring with the normally used solvents.

Abstract: The transfer sheet is used for dry thermal printing of water swellable celluluse fibers with dyestuffs which are insoluble in water of 60.degree. C. The dyestuffs are difficult to evaporate and cannot be used in a conventional heat transfer printing process. They are transferred at 230.degree. C. and a contact pressure of 10.sup.4 -10.sup.6 Pa from a base paper provided with a release coating, to cellulose fibers which have been swollen with water and the swollen state of which has been preserved after drying with a polyglycol. I order to increase the penetration of dyestuffs into the textile structure, it is recommended to lower the air pressure in the transfer area down to a pressure ranging from 1 to 5.times.10.sup.4 Pa.

Abstract: When silk fabrics, pre-treated with swelling agents, are printed by heat transfer techniques, the fabric will yellow. The invention eliminates yellowing by pre-treating said silk fabrics with a liquid or solid impregnating agent, dissolved or dispersed in water, then drying the fabric, and adding before, during or after the pre-treating an optical brightening agent of the type normally used for polyester.The impregnating agent can alternatively be applied to the fabric in a water-free condition before or during dyestuff transfer, and an optical brightener may be added.It is further contemplated to use easily migrating dyestuffs which are transferred to the fabric at relatively very low temperatures, and to avoid dyestuff migration by pre-treating the silk fabric with solid impregnating agents.All these techniques produce deep and brilliant shades; the prints have excellent fastnesses.

Abstract: A nucleophilic alkoxylated compound is bridged as a polyurethane by a polyisocyanate derivative or as a polyester by a polyacid derivative. A desensitizing ink for wet offset printing on an acceptor surface of a chemical duplicating set is thus obtained.

Abstract: In a desensitizing ink for the wet offset printing of a given area of the acceptor surface of a duplicating set containing an alkoxylated nucleophilic compound, preferably having a molecular weight lying in the range of from 2000 to 4000 and having a hydrophilic-lipophilic balance (HLB) of from 3 to 6, emulsified water is added to the mass of ink.This rapidly forms a fine stable emulsion of water in the ink which is favorable for continuous wet offset printing.

Abstract: A process for preventing the counterfeiting of valuable documents through use of photography, photocopying techniques, or other methods of counterfeiting. The process includes laminating an extremely thin metallic film to the substrate of the valuable document before the document is printed with the area of the metallic film being small in comparison to the area of the document. The metallic film can be located anywhere on the face of the document and a "latent image" is embossed on the metallic film when the document is printed. Embossing the latent image on the metallic film, rather than on the document substrate, provides many advantages not possible in the prior art.A photocopy of a document containing the embossed metallic film does not include the latent image and a color photocopy will be different in color than the original document. Therefore, a lay observer can readily differentiate between a genuine document and a counterfeit document.