Abstract: The invention relates to a method for packaging carbon dioxide snow in a plastic film bag, in which method the following steps are employed: a—a fluid which has a temperature below the dew point of the air is injected into and in contact with the plastic film bag, then b—the carbon dioxide snow is introduced into the plastic film bag, then c—the plastic film bag is closed. The invention also relates to apparatus for implementing this method.

Abstract: The invention relates to a method for packaging carbon dioxide snow in a plastic film bag, in which method the following steps are employed:

Abstract: Provided are catering service trolleys for preserving and distributing meal service trays in aeroplanes. The trolley includes side walls with double shells defining vertical channels opening at their upper part into the housing containing the refrigerating agent and at their lower part in the proximity of the bottom of the section receiving the meal-trays, thus enabling the refrigerating gas to circulate by convection over the whole height of the trolley and a more homogeneous temperature distribution.

Abstract: An insulated chamber (1) for preservation and transportation comprises a container (2) of carbon dioxide snow provided with a lateral opening (5) permitting the injection, within the container, of liquid CO.sub.2 under pressure by a distribution device (10) connected to a source of liquid CO.sub.2 (6). The distribution device is provided with an electrovalve (18) controlled by a control block (19) comprising a timer permitting selecting the duration of injection of liquid CO.sub.2 into the container (2) to form there a controlled volume of carbon dioxide snow. The installation is useful for the preservation and transportation of fresh food products as well as frozen food products.

Abstract: An insulated chamber (1) for preservation and transportation comprises a container (2) of carbon dioxide snow provided with a lateral opening (5) permitting the injection, within the container, of liquid CO.sub.2 under pressure by a distribution device (10) connected to a source of liquid CO.sub.2 (6). The distribution device is provided with an electrovalve (18) controlled by a control block (19) comprising a timer permitting selecting the duration of injection of liquid CO.sub.2 into the container (2) to form there a controlled volume of carbon dioxide snow. The installation is useful for the preservation and transportation of fresh food products as well as frozen food products.

Abstract: The container (1) is divided interiorly into an upper chamber (3) receiving a reservoir (9) for refrigerant product, typically dry ice, and a lower chamber (4) receiving the load, by a thermal shield (6) from the edges of which extend into the lower chamber (4) a flexible baffle structure (12) guiding the circulation of cold gas between the upper chamber (3) and gas passages along the walls of the lower chamber (4) defined by vertical (10) and horizontal (11) strips. The container is especially useful for the transport of fresh or frozen products.

Abstract: The present invention relates to an isothermal container with isothermal walls comprising a thermally conducting reservoir (10) for refrigerant product disposed in the upper part of the container; a baffle (3) of thermally insulating material, of a size slightly less than the internal section of the container and having about its periphery an annular space (8) suitable for the free passage of the gas is disposed horizontally below the reservoir (10), at a distance sufficient to delimit in the upper part of the container a region (6) suitable for natural convective heat exchange; the reservoir (10) and the baffle (3) comprising securement and support means (4, 12, 13, 14) in the container (1), characterized in that it computes at least one food compartment (c) disposed in the container, below the plate forming a baffle, of a size substantially less than the internal volume of the container, a space remaining free about the compartment (c) in the container.

Abstract: Particles of shot and particles of carbon dioxide ice are simultaneously blasted onto the work piece (6) to be treated. Application in the treatment of the surface of work pieces composed of plastics material or coated with a plastics material.

Abstract: A treatment chamber for a charge comprises at least oen door, internal walls delimiting a treatment space, passages for the recirculation of gas, and apparatus for circulating gases in the treatment space and the passages. The circulating apparatus extracts the gases from the treatment space (4) and sends them through the passages (9, 9'). The chamber is provided with injectors (12) for cryogenic fluid and an outlet (16) for evacuation of gas. The injectors are at least one nozzle (12) to spray liquid nitrogen or carbon dioxide and are disposed adjacent the circulating apparatus, which is in the form of a fan (8), the injectors (12) being directed toward the inlet of this fan. In the corresponding treatment process, a cryogenic gas is circulated through the charge, a cryogenic fluid e.g. liquid carbon dioxide or liquid nitrogen is injected into the gas flow leaving the charge, and the cooled gas is recirculated so as to cause it to pass again through the charge in the same direction.

Abstract: The installation comprises three units separated from one another: a grinding mill (1) fed with pieces of dry ice, a metering device (3) having an extracting spring-screw (13), and a propelling device (5) mounted in a vehicle gas conduit (4). The assembly is maintained under an atmosphere of CO.sub.2 by a cover (6). Application in the cleaning of surfaces in the nuclear industry.

Abstract: The apparatus comprises a plurality of modular containers (2) each receiving a charge of products. Liquid CO.sub.2 is injected into each container under the control of a thermostat (28). The excess gases are collected in a single manifold (5), heated in a vessel (3) and then discharged through calibrated discharging means (7). The invention is particularly suitable for the cooling of food products.

Abstract: The invention concerns the cooling of a viscous product. The product placed in a vessel 30 is cooled by a rotary pot 8 in which is generated, by sleeves 20 and 21, a deposit of carbonic acid snow 40. Application in the cooling of food products such as clear soups, thick soups, sauces, creams, pastes, gelled products, etc.

Abstract: The gaseous CO.sub.2 is supplied at a pressure of 10 bars and at a constant rate of flow to the primary inlet (3) of an aspiration device (1). Gaseous SO.sub.2 coming from a cylinder (24) which is heated and contains liquid SO.sub.2 is conducted through a heated line (4) provided with an adjustable flow meter (27) to the secondary inlet (5) of the aspiration device. The mixture issuing from the latter is injected into a buffer tank (6) whose pressure is regulated at a value higher than the pressure of utilization and is drawn from this buffer tank when utilized. Applications in the supplying of mixtures for hardening sand moulds or cores to foundries of medium size.

Abstract: A treatment chamber for a charge comprises at least oen door, internal walls delimiting a treatment space, passages for the recirculation of gas, and apparatus for circulating gases in the treatment space and the passages. The circulating apparatus extracts the gases from the treatment space (4) and sends them through the passages (9,9'). The chamber is provided with injectors (12) for cryogenic fluid and an outlet (16) for evacuation of gas. The injectors are at least one nozzle (12) to spray liquid nitrogen or carbon dioxide and are disposed adjacent the circulating apparatus, which is in the form of a fan (8), the injectors (12) being directed toward the inlet of this fan. In the corresponding treatment process, a cryogenic gas is circulated through the charge, a cryogenic fluid e.g. liquid carbon dioxide or liquid nitrogen is injected into the gas flow leaving the charge, and the cooled gas is recirculated so as to cause it to pass again through the charge in the same direction.