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 .

Polypropylene or Monorientado and CAST Biaxially oriented polypropylene BOPP. Basic differences between them. First to say no one is better than the other, just that one function of the application is more desirable than the other. Transparency and brightness is quite similar in the two cases. The BOPP being 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 heat with less time temperature and thickness of the electrode (welding wire). How to differentiate from each other? BOPP: Catching one of the sheets of the bag and pulling the sides of the Bioriented not stretch without envargo the cast monorientado or 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, polyolefin shrink etc. Machines have to close these bags are desktops, manageable, and very easy to use if you can see in this link.<here mouse click> Poliprolileno micro-perforated bags . Micro Details