Netstal crossing the threshold of 2 mm of thickness of preform them

The current minimum standard of up to 2 mm wall thickness means that you preforms them already they have touched its limit. In other words, in relation to the consequential hollow containers to be made from of her preform geometry of preform them is at its doorstep. Any reduction in the weight of her preform only will be possible through a specific know-how and a high level of innovation.

Weight reduction through a new minimization of the thickness of the wall of her preform is possible, but lowering the limit of 2 mm necessarily depends on the ratio of the length of the route of the flow in the cavities. Only a precise system integrated with high reproducibility of the process of molding by injection and a very solid construction of the mold could lead to solve that challenge. Accepting that the injection under high pressure may deform males and harm both the distribution of the thickness of wall (something that must be avoided at all costs), the more severe requirements are for the system and in particular to the mold. In close collaboration with the Swiss manufacturer of molds Otto Hofstetter, Netstal has managed to build systems that allow breaking the barrier of 2 mm, ensuring all the requirements of quality.

In addition to reducing the wall thickness, also has other reduction measures of weight, for example in the threaded neck. In this area, the manufacturers of molds Otto Hofstetter and MHT (Germany) have succeeded in reducing weight without enforceable standards to plugs and without harming the quality. While we are only talking about a few tens of gram for preform, the sum represents tons of PET savings per year.

Another area of her preform important when you want to save weight is the basis. By using special forms of the base as the Cappello design, an infrared heater can heat the base more effectively, especially in the case of old machines blowing. In this way improves the drawing of the base and avoid thick areas in the area of the trough of her preform. This step not only improves the distribution of the tensions in what will be the base of the bottle, reducing the chances of cracking, but it also reduces the weight.