By Arabinda Ghosh
Geared toward engineering scholars, engineers, and technologists of the packaging undefined, this ebook presents the necessities of polymer packaging. It presents the reader with the information and talents to spot and resolve difficulties in packaging methods, and thereby enhance useful packaging. revenues and advertising and marketing humans interested by the packaging also will locate this a worthy source. a brief primer on polymeric fabrics and ingredients is by way of descriptions of crucial creation approaches for polymer packaging either non-stop and discontinuous. extra chapters disguise expertise of sealing and diverse changing tactics of packaging webs. The transparent, sensible informational concentration stems from the authors huge event within the packaging industries and as an educator.
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Laminated Tubes with an Outer Coating As already mentioned, every laminated tube has a longitudinal seam, the edge of which can be seen or can be felt with the fingers. Although technically quite okay, it does not look nice. In order to utilize the high barrier of an Al layer with the simultaneously better appearance of an edge-free tube surface, the tubes are coated on the outside with a PE layer. To produce this type of tube, the laminate roll is unrolled, sealed longitudinally as a lap seal continuously, and passed through a vertical ring die, where the outside of the tube is coated with a PE layer.
The cylindrical part of the tube is made by longitudinal sealing of a rectangular piece of laminate. Every laminate tube has a longitudinal seam. It may be a lap seal, or both ends may be fixed with two thin PET tapes sealed at the inside and outside. An injection-molded shoulder is sealed at one end of the cylinder. If necessary, a security film membrane is sealed on the orifice. A cap is brought onto the shoulder, either threaded or pressed. The laminate tube is now ready to be filled. The sealing of the shoulder with the cylindrical part must be of high quality because it is the weakest point of such a tube.
In particular, it is very important to not overheat the extruder. If the extruder is overheated, then resin may burn and produce brown to black particles. Some of them stick to the barrel inner wall. Even if later, good melt quality is produced, the burned particles leave the barrel wall from time to time, which leads to a dirty melt. Spots or even holes in the films or pipes are produced. It may take a whole day to clean the extruder. The extruder is mounted on a robust base. The screw is turned by a powerful electromotor via a suitable gear system to achieve different RPMs for the screw.