PVC soft sheetin detail
PVC hard sheetin detail
PVC roodin detail
PVC is a plast on the basis of polivinilkhlorid, not containing a plasticizer. Except for polivinilkhlorid, in composition PVC. stabilizators (preventing destruction of material at processing and exploitation) and oilings matters enter (facilitating pererabot).Sometimes in composition PVC. enter dyes (for further receipt of the coloured wares), fillers(for the decline of cost, change of physicomechanical properties ) and modifiers (for the improvement of some physical properties).
PVC get mixing of component parts in the mixers of different type. Then mixture is either directly processed in wares or previously receive from it half-finished products- granules, pills or the weight received by means of rollers.Methods of processing .PVC depend on the type of the produced good: pellicle PVC. get calendering the weights, processed by rollers ; smooth folias — pressing of packages, collected from tape, on floor hydrohammers; shallow wares of different type — casting under constraint from granules on castable machines, and also pressing of pills or powdery mixture on vertical hydrohammers;pipes, profiled wares and wavy folias — by an extrusion from granules on the screw settings; large wares of the complicated configuration — by means of a method of vacuum formation from sheets on forming machines.
If a granulate of is polivinilkhlorid ( PVC) in form by a granul-cilindrov diameter from 2 to 4 mm (bead PVC), then concept of PVC — polyvinylchloride without addition of plastic in the form of sheets. PVC ( sheets of NPVC) is made the methods of pressing, calendering or extrusion.
In first case, by thermal presovaniya resins are with tape of PVC, and other remaining raw material of PVC, by a stay after the processes of calendering of tape or extrusion of other wares - PVC of brand of VN turns out. In last case resin of PVC is skipped through an extruder with a preliminary warming-up, as a result get granules, rod or folias of NPVC( lasts is named viniplastom of brand of VNE).
At addition of plasticizers appear "soft" forms of PVC (see, for example, a plasticate of PVC is a sheet, cable plasticate).
PVC is thermoplastic opaque material; does not burn and does not have a smell; well added to the different types of tooling on ordinary machine-tools.
PVC easily welds (230-250°C) by welding rod and well sticks together the various types of glues, prepared .On the basis of polyvinylchloride and perchlorovinyl pitches; welding and glue connections durability of which makes 80-90% from durability of material, well added to tooling.
PVC can be also glued to the metallic, concrete and wooden surfaces. PVC is a good dielectric scope 20-80°C; at heating higher 80°C comes sharp falling of dielectric properties. Protractedly possible working temperature from -30°C to +60°C, without the mechanical loading maximally possible lower limit -50°C.
PVC will not dissolve in a methyl, ethyl alcohol, higher alcohols, glycerin and numerous aliphatic alcohols, aliphatic hydrocarbons, lubricating and vegetable butters. PVC sheet chemically bars to influence:
- sulphuric acid: oil of vitriol to 20°C, 40% concentrations to 60°C;- aquafortis to 50% at 50 °C;
- are mixtures of acids nitric and sulphuric;- nitrozy;-departing gases (khlorovodorod and chlorine in mixture with air and aquatic pair);
- acetic acid100%; — ant acid to 50%;
- phosphoric acid, divorced and concentrated;
- sulphureous acid; are lyes to 50%;
- ammonia; — to the chloric lime;
- are peroxigens 10%; — solution of permongonata concentrated;
- solution of salts of all kinds;
- ozone; — sour sewages;
- alkaline sewages;
- fuoric acid to 40% at 20 °C;
- sulphuretted hydrogen water;