The insertos adjustable of blocks of feeding give speed and precision to the fimbriated of layers

The insertos adjustable for the block of feeding Ultraflow I that can adjust during the coextrusión allow to the manufacturers film and plate reduce the time of inactivity and the waste of material while they prepare insertos of permanent flow, and also logar greater precision in the profiles of definite thickness of each layer to the wide of the cabezal, as it has announced Nordson Extrusion Dies Industries.

A block of feeding gives form to polymers melted of two or more extrusores in layers to produce a structure of sándwich that distributes later to all the width of the final product inside a cabezal flat. In blocks of feeding like the Ultraflow I of Nordson Extrusion Dies Industries, an insert of flow mechanised especially provides a profile of thickness in transversal steering aim, and any change of work that involve relations of layer or properties of flow of polymer significantly different does necessary to design and mechanise different insertos. The innovative insertos of adjust for blocks of feeding Ultraflow I allow that the processors keep the production while they do adjust them until it attain the objective profile and can build an insert permanent adapted.

In the schematic diagram of the new insert of adjust for block of feeding Ultraflow I, the flow of polymer for a structure of five layers is of right to left. The polymer of the layer of the core ingresa in the channel of flow from the extreme more to the right. The following layer ingresa from the ports in the top and inferior, and his profile of thickness determines by means of the components of adjust of flow of colour bronze. Afterwards it comes the entrance of the external layer, that also outlines by means of ajustadores of flow. Each ajustador is formed by ten segments and the position of each segment determines by means of screws (that they do not appear in the illustration).

“The new insertos of adjust help to the processors to maximizar the time of operation and minimise the waste during the week or more than requires to design and mechanise insertos permanent”, commented Sam G. Iuliano, technician in boss. “Due to the fact that the insertos of adjust can adjust ‘on the fly', is possible to do several repetitions and do small additional changes in very little time and outlining the geometry with a lot of precision before mechanising an insert permanent. This process deletes the need to do several ‘cuts' of an insert permanent before arriving to the profile of layers wished”.

An insert of flow is typically of some 4 inches (10 cm) of width, mechanises in stainless steel and is designed especially to generate a profile of layer correctivo for a polymer with properties of specific flow. The component of adjust of flow of the new insert of adjust of Nordson Extrusion Dies Industries consists of ten segments, each one of which can adjust to reduce or increase the thickness of layer by means of the twist of his corresponding screw. Once that it has established the objective profile, a tool of measurement supplied by Nordson Extrusion Dies Industries reproduces the positions of the screws so that they can use to produce an insert permanent that correspond exactly.

The blocks of feeding of fixed geometry Ultraflow I can design to adapt to a carrete of sequence that makes possible to change the sequence of layers of material without having to block channels or disarm the block of feeding. Nordson Extrusion Dies Industries Also offers the block of feeding of adjustable geometry Ultraflow V that, in place of insertos interchangeable, has “flat combinadores” adjustable incorporated situated in the points in which the currents of material melted join with the channel of central flow.