ARBURG
Micro-injection module for production of miniature parts / Double screw can handle standard granules
Arburg (Lossburg / Germany; www.arburg.com) has developed a micro-injection module that offers a solution for the injection moulding of miniature and micro parts using standard granules. An injection module combining an 8mm injection screw with a second screw for melting the material can meet technical specifications for producing these very small parts, the company claims.
 Shot weights of just a few milligrams can be achieved with the new micro-injection module from Arburg (Photo: Arburg) |
With shot weights of just a few milligrams it is essential that the dwell time of the melts in the injection unit is kept low to reduce material shearing. Precise regulation of the cylinder temperature is also important. The new unit employs a servo-electrically driven screw pre-plasticising section, installed at 45° to the horizontal injection unit, to prepare standard granulates for injection. The molten material is then transported from the pre-plasticising stage to the injection unit.
The 8mm injection screw is used solely for transport purposes. It is fitted with a non-return valve and operates on a screw/piston principle. The homogenous melt is then continuously fed from the material inlet to the tip of the injection screw. A newly dosed melt is always available for every shot, keeping material dwell times short, preventing thermal damage to the material, Arburg said.
The micro-injection module is designed specifically for use on electric “Allrounder A” machines with a size 70 injection unit. It has a modular design that can be changed quickly, allowing the machine to be used for the moulding of larger parts.
The 8mm injection screw is used solely for transport purposes. It is fitted with a non-return valve and operates on a screw/piston principle. The homogenous melt is then continuously fed from the material inlet to the tip of the injection screw. A newly dosed melt is always available for every shot, keeping material dwell times short, preventing thermal damage to the material, Arburg said.
The micro-injection module is designed specifically for use on electric “Allrounder A” machines with a size 70 injection unit. It has a modular design that can be changed quickly, allowing the machine to be used for the moulding of larger parts.
18.05.2010 Plasteurope.com [216229]
Published on 18.05.2010
German version of this article...