The origins of HST machinery go back to 1949, when the company's founder, Ingeborg Sauter, began to pack and sell tea bags by hand. Already at that time, the first mechanical devices were developed to simplify the manual work. Since those early days, the constant modernization of the tea packing plant has gone hand in hand with developments in mechanical engineering.

In the early years, small semi-automatic tea bagging machines were designed and built, which were soon used not only in-house, but also by tea packers in Germany, Austria and Switzerland.
The PT-5 was the first tea bag machine for the production of single-chamber bags without thread and label, followed by the PT-10 with thread and label. This was the first HST model to be a worldwide market success, produced in larger numbers and sold worldwide. The PT-10 was replaced around 1972 by the PT-20 series, where the double chamber bag replaced the single chamber bag. Initially the PT-21 for so-called naked tea bags, the PT-25 for paper bags was added in the 1970s. At the beginning of the 1990s, the PT-33, a model for tea bags with single aroma protection, was developed to series production readiness.

The growing number of tea packs sold necessitated the construction of the company's own wrapping machines (cellophane machines), such as the very smooth-running and stable ZE-10 model built in the 1960s, which was followed by the high-speed ZE-30 wrapping machine. This was initially built only for tea packs and was soon designed for many format ranges as well. This new type of machine was built from 1983 and sold in large numbers worldwide, especially to the food and cosmetics industry, but also for special applications such as tape-cassettes, CDs, DVDs.

In the course of time, many hundreds of machines and devices of all types and years of construction were used in production in the company's two own tea packaging plants in Germany. This resembles a permanent test operation, which makes it possible to pass on the experience gained directly to the mechanical engineering department and thus ensure constant improvements, a stroke of luck that not every supplier of tea bag machines can claim for itself. A fact that ultimately benefits not only the company's own packers, but also its many international customers. In this way, the PT series has also been constantly developed and improved.

Today, HST's mechanical engineering is optimally adapted to the requirements of the tea processing industry. Building, equipment and qualification of the staff meets all the criteria of a modern machinery supplier. Dozens of companies all over the world successfully work with HST tea packaging machines.

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