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11-29-2017

Double-Sided Injection

High Precision Production of a Felt Tip Pen

The Star-Line nozzles allow flexibility with applications for a wide variety of resins, since practically all engineering resins, also with fillers added, can be processed reliably (© Heitec)

Together with Staedtler Mars GmbH & Co. KG, Heitec Heisskanaltechnik GmbH developed and implemented an effective and user-friendly mold concept for the production of a felt tip pen with side injection.

The required product quality dictated a double-sided injection per article in order to ensure the desired precision and dimensional stability. The barrel made of polypropylene (PP) needs to guarantee a long life of the pen. Together with the customer, Heitec Heisskanaltechnik, Burgwald-Bottendorf, Germany, searched for an optimal cavity arrangement and found it with the Star-Line nozzle 01.072.44.100.

Due to the compact tool construction of the two 16-cavity tools it was necessary to use as few hot runner nozzles as possible, whereby an article was filled with two opposing Star-Line nozzles. This was achieved by arranging the two nozzle tips partially at 90° degrees to one another. This improves the core stability, thus enabling a more uniform cavity fill and reduced wear. With this Star-Line nozzle arrangement its advantages, such as the variable tip positions, can be fully utilized and various articles can be arranged almost "free-dimensionally".

Thanks to the naturally balanced manifold fast color changes can be achieved. The thermally excellent temperature characteristics of the hot runner nozzles also enable the processing of luminescent colors.

The two-part snorkel and snorkel adapter, which can be separated below the crown, enable the introduction of a second parting line on the nozzle side. Therefore, the core pins can still be changed on the machine by opening this separation (remove 4 screws) and, if applicable, several article variations (core pin sizes) can be produced with one mold.

This possibility of nozzle separation naturally saves enormous set-up times since this advantage can also be used for tool cleaning, e. g. for vents. Here, the complete electrical installation remains untouched.

Company profile

Heitec Heisskanaltechnik GmbH

Frankenberger Str. 25
DE 35099 Burgwald
Tel.: 06451 7283-0
Fax: 06451 7283-83

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