SU903144A1 - Roll to roll-type machines for processing polymer materials - Google Patents

Description

(5) ROLLS TO ROLLS FOR PROCESSING

one

The invention relates to equipment for the processing of plastics, rubber compounds and can be used in various kinds of roller plants: calenders, rollers, and mainly in installations for the heat treatment of polymer films.

A roller for roller machines for processing polymeric materials, containing a rotatably mounted shell and placed inside the circumference of the circumference with equal intervals relative to each other at an equal distance from the inner surface of the shell, stationary heating elements in the form of quartz tubes, with quartz tubes having common or individual for each element reflectors that direct the radiation to the heated surface of the shell 1.

Such a roll does not allow creating a uniform temperature field according to POLYMER MATERIALS.

The length of the roll shell is due to uneven temperature along the length of each heater, caused by end effects, the need for cooling the terminal connectors at the ends of the heater, etc., as a result of which the edges of the shell heat up less than the center.

Closest to the proposed roll is to a roll machine for the processing of polymeric materials, containing a rotatably mounted shell and a continuous spiral heating element t2 concentrically mounted inside the latter along its length.

IS

In such a roll, the spiral heating element is wound around a central axis and its turns are angled to the longitudinal axis of the roll. This embodiment of the heating element increases the uniform heating of the roll along its length.

Claims (1)

However, the spiral heating element used in the roll has constant dimensions in length, diameter and frequency of coils, which limits its operational capabilities in terms of the length of the heated section and the intensity of its heating. The purpose of the invention is to expand the operational capabilities of the roller. a rotatably mounted shell and a continuous spiral heating element mounted inside the latter along its length, with (Invention , is provided with supporting elements mounted inside the shell, at least one of which is mounted with an axial displacement relative to the shell and is spring-loaded relative to the end of the latter, and the turns of the spiral heating element are arranged parallel along the axis of the roll with equal pitch and fixed around the circumference on the supporting elements. 1 shows a general view of the device, and Fig. 2 shows the supporting elements q with heating elements embedded in them; The roll contains rotatably mounted in the subsh nozzles 1 shell 2 with end caps 3. Inside the shell along its length, a continuous spiral heating element k is concentrically mounted, the stack of which is arranged parallel along the axis of the roll with equal pitch relative to each other and fixed around the hole in the holes 5 of the supporting elements 6 and The latter are installed inside the shell on the fixed central pipe 8, the supporting element 7 being axially displaceable and spring-loaded relative to the end cover 3 by a spring 9 mounted on an axially movable bowl 10 connected to the supporting element 7. The ends of the heating element k are connected to a voltage source (not shown). Supporting elements can be made of electrically insulating material or metal with elements for thermal and electrical insulation. Wire or nichrome or other known materials can be used as a heating element. This design of the roll can be equipped with a temperature sensor that, together with the regulating device, allows control of the amount of current supplied to the heating elements and precisely maintain the temperature of the roll. Any known sensor can be used as a temperature sensor, and it can be either contact or non-contact and is installed either inside or outside the roller, depending on the specific heating conditions of the polymeric material and the required accuracy of maintaining the surface temperature of the roll. The roller works as follows. When voltage is applied to the heating element, the latter, due to its continuity, heats along the entire length and uniformly heats the shell 2 to the required temperature. In the process of heating, the heating element — the wire or tape — may lengthen and sag, especially at the center of the roll, which causes a drop (decrease) in the temperature at that place. In order to eliminate this undesirable phenomenon, the coils of the support element 7 are constantly tensioned by the spring 9, and the holes 5 allow the heating element to freely pass through the supports 6 and 7. If the heating surface of the rolls is to be enlarged, the support elements can be moved apart. The distance between the turns can be pre-set in accordance with the necessary heating conditions. Thus, the aforementioned design of the roll to the roll machines for the processing of polymeric materials improves the uniformity of the temperature field of the roll by using a continuous spiral heating element and expands the technological capabilities of the roll. Invention Roller for roller machines for the processing of polymeric materials, containing a shell installed with the possibility of rotation and a continuous spiral heating element mounted concentrically inside the latter over its length, I distinguish