Seals help blow molding machines work longer

Guangzhou Tech-Long, the largest manufacturer of PET (polyethylene terephthalate) bottle blow molding machines in China, needed a sealing solution for the dispenser located in the center of a blow molding machine, the core part of the machine where failure can lead to high costs due to lost production time. To achieve optimum performance the choice was a specially developed Turcon® PTFE based compound. A number of seals were specified including a custom Turcon® Roto Glyd Ring®, with a unique pressure relieving function.

The aim is to maximize production

The sealing system within the dispenser needed to operate in 1 to 4 MPa/ 145 to 580 psi dry air pressure at rotational speeds of 150 mm/s / six in/s non-stop for between 16 to 20 hours per day.

Image shows a Tech-Long dispenser

“We are continually trying to offer our customers machines that maximize production capability while minimizing downtime for maintenance,” says Zou DaQun, Technical Director of Tech-Long. “Trelleborg Sealing Solutions is a very good partner to Tech- Long. They do not just sell products but more importantly provide professional technical services and solutions. That is what Tech-Long is really interested in and why we have been in cooperation with Trelleborg for 10 years continuously.”

Successfully sealing dry air

Dry air is a difficult medium to seal. To successfully do this the seal must initially demonstrate a very smooth and tight dynamic sealing surface after a short run in. It must then have outstanding wear resistance in poorly lubricated conditions.

Sealing configurations from Trelleborg Sealing Solutions are now successfully operating in Tech-Long PET bottle blow molding machines globally. Tech-Long and Trelleborg Sealing Solutions continue to work together on new developments.