Polymer Tech

RUBBER LINING: Rubber lining  is a rubber sheet or membranes used for protection from corrosion in aggressive chemical environments. There are several rubber Lining applications some of which include resistance to acid, chemicals and alkalis, abrasion resistance, infect protection Types of Rubber for Linings ·      Natural Soft Rubber Linings ·      Hard Rubber Linings ·      Synthetic Rubber Linings Various  Synthetic rubbers   like chloprene rubber, butyl rubber, and hypalon rubber are used for making these types of rubber lining.  Both the types of rubber-  natural Rubber   and  Synthetic rubber  - are used for making different varieties of rubber linings. The type of rubber depends upon the purpose and application of rubber lining. Natural soft rubber linings are usually made from various types of poly soft rubber. These types of rubber have such characteristics as low hardness, high resilience, and flexibility.  They are abrasion resistant linin

     De f lashing Many m oulded products can be separated from their excess m oulding scrap by use of scissors, cr y o g enic deflashing or buffin g . T he latter process has to be carried out w ith caution for those products w hich are bonded to m etal substrates, because excessi v e g eneration of heat w ill result in loss of the bond inte g r ity and product failure.   Bu ffi ng M ach i nes T hese units can v ary from si m ple w i re brushes rotating at hi g h speed to carborundum belts. H eat g eneration in the rubber product is the m ain problem w ith these units.   Cr y ogen i c De fl ash i ng Un i t s Cr y o g enic deflashing of rubber is co m m only carried out using liquid nitro g en as the te m perature depressant, althou g h so m e s m aller units can be operated using solid carbon dioxide as the low te m perature m ediu m . C orrect deter m inati

F l u i d   Bed   S y s t em T his   s y ste m ,   de v eloped   by   Rapra   during   the   period   1959   to   1974   uses   the   principle   of   fluidisation  of   particles   by   the   passa g e   of   air   throu g h   the   m ass.   I n   its   si m plest   form   the   po w der,   usually   g l ass   beads   (ballotini),   is   held   in   a   m etal   trou g h in   the   lo w er   portion   of  w hich   lies   a   la y er   of porous cera m ic   tiles,   abo v e   the   air   pipes   and   heating  m eans.   Passa g e   of the heated   air throu g h the ballotini causes   fluidisation.   T here   is   so m e   de g r ee   of   loss   of   fluidisation   i m m ediately   abo v e   the   profile being   v ulcanised   if   the   fluidisation   is   from below,   but   this   can   be   i m pro v ed   by   using   side   entry   for so m e   of   the   air. A f ter   re m o v al   of   the   v ulcanised   product   it   is   necessary   to   re m o v e

A u t o cla v es Autoclaves for rubber product vulcanization are available a wide range of sizes to suit the product type. The main use for autoclaves is in the production of extrusions, sheeting and components which are of unsuitable size of construction for convention mould vulcanization.Exa m ples   of   this   t y pe   of   product   can   ran g e   from roller   co v erin g s   to   hand - built   products   such   as footwear. The Machinery: Autoclaves are predominantly cylindrical pressure vessels with lids or doors to process the  rubber parts that require exposure to elevated pressure and temperature. They are available in a wide range of sizes and design pressures in horizontal (or sometimes vertical) configuration. The key component of the autoclave is  the door . For a manufacturer, this is also the critical component in cost of autoclave construction.  Two  types of autoclaves are in common use –  Non-jacket ed  and  Jacketed . In the  non