• General 26.04.2018 Comments Off on Vacuum Forming

    Production of blister packs is by vacuum forming. Accordingly, in order to produce the blister, you must first make a matrix. Production of blister packs and is to source material (plastic film) took the form of a matrix. The principle of its establishment as a whole, not unlike the manufacturing of molds for stamping. However, the polymer film is much softer and more pliable metal, so production of blister packaging allows for a matrix of less durable materials, which facilitates their manufacture and reduces costs. Manufacturing blisters occurs by creating a vacuum, or at least area of low pressure in the space between the polymer film and the matrix. In this case, on the other side of the film is air, which puts pressure on her, forcing fit snugly inside the mold, repeating its outlines. Manufacturing Blister packaging uses heated material – the film should be flexible, and after the adoption of the necessary forms to harden and turn into a solid blister. Nieman Foundation is open to suggestions.

    The described process of manufacture of blister packaging – this is the method vacuum forming. Due to the fact that the polymer film is heated to the required strain, the production of blister packs are often called, and thermoforming. The whole procedure is carried out by special vacuum-molding machine. As a rule, it is fed, roll tape (that is, the film does not cut into sheets). Therefore, after the release of material from the manufacture of blister packaging machine continues. Ribbon cut on sheets, and each of the blisters are harvested by special apparatus.

    However, production of blister packaging includes adherence to the finished blister cardboard substrate (if appropriate), and styling products in the ready packaging. In this package can be collapsible – in this case, the edges are folded blisters on three sides, and it is inserted into a cardboard backing. Can and glue the blister with a substrate. In this case, the production of blister packaging requires heat caused by blister thermo varnish so that it firmly sticks to the cardboard.

  • General 31.01.2018 Comments Off on Operating Experience

    The analysis of known solutions to design annulus, it was decided to abandon the intensifying heat transfer fluid flow patterns: cross-washing tubes with segmental partitions; swirl flow in the annulus with the help of specially made shear walls or by partitioning into the annular space in the form of twisted ribbons, etc. Therefore, considered heat exchangers are simple so-called reverse current circuit coolant, the space between the tubes do not cross partitions, install only one longitudinal septum. In addition, revised decision on the pipe wall thickness, shells, flanges, tube sheets, covers, without reducing their strength. Kidney Foundation gathered all the information. Experience to date experience in operating this type of heat exchanger is shown that the devices, in contrast to plate heat exchangers are not very sensitive to sudden temperature fluctuations and pressure. Their tube bundles easily and withstand the effects hydroblows, vibration, shaking. Pipes for supplying and draining medium located in the head coil (figure), which provides the convenience of strapping heaters and reduce thermal strains. At nominal values of expenditure-type heat exchangers have vvpi moderate pressure drop of 20-50 kPa, which in the case of the need for large heat fluxes at low temperature pressures connecting heaters in the units in parallel or sequentially in both Wednesdays, or a combination of schemes of their connections in the block. Pigging these heat exchangers can be made by any known method: chemical (1,5% aqueous solution of nitric acid), cavitation shock method, the steel wire hedgehogs, etc. Designed heat exchangers for energy and weight and size characteristics are second only to shell and type of vehicles ttai, but surpass the latter in Indicators of reliability due to the greater rigidity of tubes (lack of sag, and consequently the friction of pipes against each other) and a more reliable fastening tubes in tube sheets by welding, rather than silicone.

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