Perforated polypropylene bags for packaging bread or any other product that needs a good transpiration . The measure is ( B x C ) . B and C is the length width or height of the bag .

E CAST or Monorientado polypropylene and Biaxially oriented polypropylene BOPP . Basic differences between the two. First to say that no better one than the other , simply a function of the application one is more desirable than the other . Transparency and brightness is quite similar in both cases . There is a kind bag that matter some companies call it poliprolileno CRISTAL his excellent brightness , but not heat- welded must be closed with adhesive . These bags we do not have it in stock . The BOPP being of the same thickness as the CAST is more rigid but gives the feeling of thickness . The CAST is softer to the touch , is more pliable and easier to weld with shorter heat temperature and thickness of the electrode ( welding wire ) . How to differentiate one from another ? BOPP : Catching one of the sheets of the bag and pulling the sides of the Bioriented not stretch without envargo the monorientado or cast if this is the easiest way to recognize them . Keep in mind that there are other materials that are very similar but have other properties , cellophane , polyester , polyamide , etc. Polyolefin Shrink . Machines have to close these bags are desktops , manageable , and very easy to use if you can see in this link . <click here> Poliprolileno micro-perforated bags . Micro Details