EuroWire March 2016

wire 2016 show

4-8 April

Here it is extremely important that a uniform cross-linking over the entire production run is achieved or, respectively, that the product has a uniform cell structure and a regular result of foaming. Mixing station systems are required when precise dosing is necessary over the complete speed range of the extruder, if very small amounts/percentages of additives are to be dosed or if non-visible additives are to be handled. Depending on the requirements there are various systems/solutions available. As each manufacturing requires individual solutions, it is recommended that speci c solutions are worked out, in order to get the best results. In cable manufacturing nowadays it is common to make use of mixing station systems. In these types of systems all materials are dosed and thus controlled. Mixing stations work fully independently of the extruder speed and material consumption. Since the end of the 1970s, Woywod Kunststo maschinen has continously developed this technology and supplied reliable and high quality Plasticolor equipment to the market, which meets the requirements of the various customers. Woywod o ers two main versions of the mixing stations: • Plasticolor volumetric mixing stations and • Plasticolor gravimetric mixing stations (loss-in-weight principle) Plasticolor volumetric and gravimetric mixing stations have the following advantages: • Very good handling of all plastic materials, ranging from free- owing powder to micro-granules, and to coarse regrind • Extremely precise dosing of each individual component at any time of production • Experience has shown that this precision is ±0.5 per cent or better. It is to be noted that this precision is not taken from the average of many batches • Very good handling, quick cleaning and short changeover times • Sticking to the preset recipe over the full RPM range of the extrusion line • Very homogeneous and good quality of the mixture, also when having di erent material densities and varying material properties • Low volume of pre-mixed material of Plasticolor volumetric mixing stations are: • Material calibration tests are necessary • Comparatively low investment Speci c advantages/disadvantages

Speci c of Plasticolor gravimetric “loss-in-weight” mixing stations are: • No material calibration tests are necessary • Slightly higher cost of investment for the extrusion of special materials, synchronised Plasticolor mixing stations can be o ered. These systems provide a constant material level in the neckpiece and ensure that the amount of material does not vary. Woywod Kunststo maschinen GmbH & Co – Germany Website : www.plasticolor.de advantages/disadvantages For special applications and WTM will display a new horizontal line suitable for the production of coaxial cables wrapped with copper silver-plated tapes/wire. The line is composed of pay-o and take-up, caterpillar/capstan combined pulling unit and a wrapping unit, which is equipped with the latest generation taping head for CuAg-coated tape. Thanks to its high sensitivity dynamic dancer, this triple motorised head is particularly suitable for this kind of cable because of the precise wrapping it grants. The dynamic dancer is an active control system that adjusts the tension in real time, directly on the materials being wrapped, applying the pre-set pulling tension on the tape and keeping it constant in any situation, including when the tape is traversing from edge to edge on the spool. A further advantage of this line is to be equipped with newly designed single-shaft pay-o and take-up units: they are traversing, self-aligning and self-levelling in two axes and with a technologically advanced torque control. In combination with diameter laser control and torque sensors, they allow cable tension to be directly monitored and adjusted in real time. With this advanced adjustment system, no dancers are used, ▲ Newmachinery on o er fromWTM WTM Stand: 11D78

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March 2016