Netstal presents a world first at the Fakuma trade fair: injection compression molding on stack molds
September 8, 2015
Netstal presents a world first at Fakuma 2015 (hall A7, booth 7303/7304) – injection compression molding on a stack mold. This new innovation will be demonstrated using a 15oz (425g) margarine tub made from PP that is manufactured with 4+4 cavities on an ELION 2800-2000 and weighs only 10.7 g.
World first: injection compression molding on stack molds
Following close collaboration between the mold manufacturer Plastisud, the automation specialist Machines Pagès and the Swiss injection molding manufacturer Netstal, the injection compression molding process and the stack mold technology were brought under the same roof. It appears almost trivial at first sight: a slightly modified injection molding machine from the Netstal ELION Hybrid series molding margarine tubs in standard format 15oz (425 grams) with IML decoration in a cycle time of five seconds. On closer inspection, it turns out that the process is performed in a stack mold with 4+4 cavities. "The really revolutionary thing about the whole process is hidden from view: the polypropylene packaging is not injection molded but manufactured in an injection compression molding process," explains Markus Dal Pian, Vice President, Sales & Marketing at Netstal. "This combination of injection compression molding and stack mold is a complete novelty in the industrial production of packaging," emphasizes Dal Pian. The cavities are partially filled in only 100 ms with extremely even results and the process is performed at a low pressure to prevent tension in the material. The high quality of the platen parallelism guarantees a synchronicity of 99.98 % between the mold, machine and automation system.
A partnership for success
In just a few months, Plastisud developed a stack mold specially adapted to the requirements of the new production process. "The unique injection compression molding technology guarantees perfectly balanced parting planes with an extremely low dispersion rate" explains Laurent Buzzo, CEO of Plastisud. Thomas Iten, PAC application engineer at Netstal emphasizes: "The special design of the stack mold developed by Plastisud plays a key role in this application." The automation specialist Machines Pagès provides specific know-how in the area of handling systems for in-mold labeling (IML) to ensure that the automation process has been adapted perfectly to the machine and mold.
A genuine innovative leap
Iten is convinced that "the combination of the injection compression molding process with a specially balanced stack mold is a genuine innovative leap" because "this configuration uncompromisingly combines the advantages of the two technologies." The fundamental benefits of injection compression molding include narrow wall thicknesses and a lighter product resulting in lower unit costs. Furthermore, the end product (lids in particular) shows fewer signs of distortion and has a greater dimensional accuracy due to the lower stresses placed on the material. These properties make the end product much more attractive for packers such as margarine manufacturers compared to other processes. The financial benefits are equally as important for the packaging manufacturer: a significant increase in productivity through the use of a stack mold and drastic reduction in material costs by up to 20% as well as total flexibility in terms of shape, appearance and decoration of the manufactured part.
The Netstal product brand stands for first-class, high-performance, high-precision injection molding machinery and system solutions. Netstal customers set a high value on the company’s continuous drive to innovate, excellent service and efficient, high-performance engineering solutions, especially for the beverage, packaging and medical technology industries. The Netstal brand, embodied by the Netstal company with its long engineering tradition in Näfels, Switzerland, has been part of the KraussMaffei Group since 1992. For more information: www.netstal.com.
About the KraussMaffei Group
The KraussMaffei Group is among the world’s leading suppliers of machinery and systems for producing and processing plastics and rubber. Its products and services cover the whole spectrum of injection and reaction molding and extrusion technology, giving the company a unique position in the industry. The KraussMaffei Group is innovation-powered, supplying its products, processes and services as standard or custom solutions which deliver sustained added value along the customer’s value-adding chain. The company markets it’s offering under the KraussMaffei, KraussMaffei Berstorff and Netstal brands to customers in the automotive, packaging, medical, construction, electrical, electronics and home appliance industries. Continuing a long tradition of engineering excellence, the international KraussMaffei Group currently employs around 4,000 people. With a global network of more than 30 subsidiaries and more than 10 production plants, supported by around 570 sales and service partners, the company is close to customers around the world. KraussMaffei has been headquartered in Munich since 1838. For more information: www.kraussmaffeigroup.com.