Rigid Plastics

Alpha Packaging Introduces Two-Stage Blow-Molded Narrow-Neck Bottles

Posted: March 10, 2010

Alpha Packaging, a leading manufacturer of plastic bottles and jars for the personal care, pharmaceutical and nutritional supplement industries, has recently introduced four 32-oz. narrow-neck bottles that are made using a two-stage blow molding process. Each of the new 32-oz. bottles represent the largest size in Alpha’s four polyethylene terephthalate (PET) liquid lines: Boston Rounds, Cosmo Rounds, Modern Rounds, and Capri Ovals.
These bottles are typically used for large quantities of hand sanitizers, liquid soaps, shampoos, and conditioners, and other liquids used around the home or in larger institutional settings. The overflow for each bottle exceeds 1,000 ml (1 liter), so they are ideal for items marketed as either 32 liquid ounces or liter-size.
All four bottles are made from the same 50-gram 28-410 preforms on two-stage (reheat and blow) machinery at Alpha’s Salt Lake City plant. Reheat and blow is a stretch blow molding process in which a plastic preform is injection molded in one process, and then later, that preform is fed into a machine, reheated, and stretch-blow-molded in a second step. Often, preforms are made by one company and purchased by another company to make the finished bottle. However, in the case of these 50-gram preforms, Alpha manufactures both the preform and the bottles in its 2-stage process.
Alpha’s 50-gram preforms are available in standard colors of clear, light amber, cobalt blue and white for any of the four styles of narrow-neck bottles. Minimums for colored bottles are 50,000 pieces; clear bottles have a one-pallet minimum. Samples of Alpha’s stock bottles are available at www.alphap.com/products/catalog.html by searching under Alpha’s PET Narrow Neck bottles.