The Ukrop® Kronen

The Crown Cap as part of the UKROP Project

The Crown cap is part of the UKROP project by TESET Studio, which promotes modern eco-friendly packaging for bottled drinks.

TESET Studio offers its own innovative closure. We have developed a Crown cap that makes uncorking much easier and permits joint utilisation of the cap and the bottle.

The History of Origin

Apparently, this product appeared in the 17th-18th centuries, when people started to make glass containers.

A drink such as beer required specific transportation conditions, because it kept on producing carbon dioxide, which blew off the lid. Besides, it was important to preserve the taste of beer, because it quickly goes off if storage conditions are wrong.

At that time, rubber and ceramic plugs were mostly used, but they both failed at their tasks. Rubber plugs spoiled the taste of the contents, and ceramic plugs didn´t fit snugly in the neck. As a result, a beer cork made of bark began to appear.

The new closure was quite expensive, but was perfectly suited for the task. While interacting with the liquid, the cork expanded in size and tightly closed the neck of the container, which ensured impermeability.

In 1892, an American named William Painter invented the Crown cap, which was a breakthrough in beer corking. The cap tightly closed the bottle and looked like a crown, hence the name.

The cap surface was lined with a thin paper layer on its inside to prevent interaction between the metal bottom and the liquid.

The invention proved very popular and was used not only for beer, but also for other carbonated drinks.

Today’s Caps

Today, bottle cap production is huge. Here are some requirements that have to be complied with:

  • the caps must protect the contents from gases, liquids or steam from the outside;
  • must guarantee impermeability;
  • must be chemically inert, and anti-allergic;
  • must preserve the product’s properties under any conditions;
  • must be easy to open;
  • must have a low cost to produce;
  • must look attractive.

The caps must have certificates of conformity issued by authorised bodies after the products have been studied and rigorously tested.

Types of Beer Caps

Over the course of time the product has been developed and improved, resulting in several varieties.

The most popular cap is a “pry-off”. To open it one needs a special bottle opener. This is the easiest and cheapest way of decorking glass bottles. It is the classics of closure production.

Another type of cap is a “twist-off”. It has no denticles, but a guide pressed obliquely into the side of the cap. That’s why it is screwed onto the neck and can be opened manually and re-closed.

Another type are the aluminium Crown caps. They do not require special devices for opening.

One more type is a “ring-pull” with a convenient opening ring.

As this direction develops, we at TESET Studio will also invent a new name for our version of the Crown cap.