Abstract:
The present invention concerns a process and a device for the separation of substances dissolved in the washing waters used in a processing bath (20) for a photographic film (21). The photographic film, after passing through the processing bath, is caused to pass successively through at least two washing tanks (22, 23, 24), the process consisting of causing the waste water from the washing baths (22, 23, 24) to circulate through a nanofiltration membrane device (27), the permeate (P) from the said nanofiltration device (27) being recirculated to the washing tank or tanks (22, 23) other than the last (24) of the tanks in which the film passes, the last of the tanks being fed with clean water from an auxiliary source (31). Application to the recovery of photographic effluents.
Abstract:
The present invention concerns a method of emptying a flask closed by a liquidtight removable stoppering element (2), obtained from a single material which can be recycled, comprising at least one closure sheet fixed to a lateral skirt for mounting the said stoppering element (2) on the spout of the said flask, for example by screwing, emptying being effected by tipping onto a perforation means disposed inside an emptying orifice, characterised in that emptying is effected directly through the closure sheet of the said stoppering element (2) held in the closed position on the spout of the flask, after tearing on the projection on the said means of perforating the said sheet, the said tearing causing the opening of the said sheet over the entire cross section of the said spout. The invention also concerns a stoppering element (2) implementing the method.
Abstract:
A machine supplied with strip material and including a plurality of feed hoppers (21) arranged on a turret (20). When an external supply such as a large-capacity hopper (30) is used, an interface device (50) defines a guide (51) between the outlet slot of the external supply and the inlet slot of the machine. The interface device (50) is characterised in that at least one portion (22) of the guide is combined with the rotary turret and rotates therewith. This system is useful for supplying a photographic printer.
Abstract:
La présente invention se rapporte à un procédé de préparation de borates de métal alcalino-terreux. Le procédé consiste à produire un mélange d'un alcoxyde de métal alcalino-terreux et d'un alcoxyde de bore, à hydrolyser ce mélange pour former un précurseur de borate métallique, puis à appliquer ce précurseur en couche sur un substrat et à le soumettre à un traitement thermique pour former une pellicule inorganique sur le substrat. Ce procédé convient particulièrement à la préparation de couches de bêta borate de baryum qui peuvent être utilisées dans des dispositifs optiques non linéaires pour la génération de deuxièmes harmoniques.
Abstract:
The invention relates to a reversal color photographic print material. Said reversal material comprises a support with, in order, a substantially light-insensitive fine grain emulsion layer which does not take part in the image formation, a red-sensitive emulsion layer having associated therewith a cyan-forming coupler, a green-sensitive emulsion having associated therewith a magenta-forming coupler, a blue-sensitive emulsion having associated therewith a yellow-forming coupler. This arrangement allows to adjust the shape of the characteristic curve of red, green, blue-sensitive emulsion layers.
Abstract:
The device for supplying under pressure a photographic coating station is comprised of a first reservoir intended to receive a given volume of photographic emulsion, said reservoir being connected to an air reservoir whose pressure is maintained constant by appropriate means, the volume of said air reservoir being much larger than the volume of the first reservoir so as to absorb substantially the relative variations of pressure related to the emulsion volume variations. Application to the coating of photographic products.
Abstract:
Détecteur de tension superficielle pour écoulement de liquide. Il comporte une sonde de mesure formée d'un cylindre mouillable dont la circonférence de la section transversale ne présente aucune concavité, la distance séparant le centre isobare de la section transversale d'un point quelconque à la circonférence étant inférieure à 3 mm, et le rapport entre les distances maximale et minimale séparant un point à la circonférence du centre isobare étant égal ou inférieur à 2. Le détecteur trouve son application dans la mesure de la tension superficielle des compositions photographiques sur un dispositif d'enduction photographique.
Abstract:
Procédé de préparation de particules d'oxyde métallique, et particules ainsi obtenues. Le procédé consiste: à précipiter un hydroxyde, à ajouter un composé inorganique tel qu'un sel dont le point de fusion est inférieur à la température de cristallisation de l'oxyde, et à chauffer l'hydroxyde et le sel jusqu'à une température élevée. On obtient ainsi un oxyde sous forme finement pulvérulente permettant notamment la réalisation de couches minces conductrices.
Abstract:
On décrit le conditionnement de bandes photosensibles très longues. Le magasin comprend un socle (10) adapté à la manutention par chariot élévateur, et une enveloppe (20) étanche à la lumière constituée de deux parties (210, 211) dont chacune présente une lèvre (220, 221) délimitant des fentes permettant l'extraction du produit photosensible. L'axe du mandrin se maintient dans une position sensiblement horizontale grâce à une série de rouleaux porteurs (30) disposés sous les rouleaux de produit photosensible. Application: alimentation en papier photographique.
Abstract:
The invention relates to a punch-holder block for a perforating device and to a process for mounting punches (1) on said block. According to the invention, the block has a narrow groove (12) passing through the thickness of the block and extending along the entire length of the row of punches (1). The groove (12) is prolonged, at each end, perpendicular to the axis of alignment of the punches (1) so as to define a longitudinal beam (14) and two portions of transverse beams (15, 16). The groove (12) is arranged so that a deformation of the longitudinal beam (14) causes the two portions of transverse beams (15, 16) to move toward each other, thus blocking the punches (1). Application to the perforation of products in strip form.