FR2535746A1 - CYLINDER HEATED BY AN ELECTRIC RESISTANCE, PARTICULARLY FOR THERMO-PRINTING FABRICS OF TISSUES AND FOR CALENDERS - Google Patents

Abstract

CYLINDER HEATED BY AN ELECTRICAL RESISTANCE, ESPECIALLY FOR THERMO-PRINTING MACHINES FOR FABRICS AND FOR CALENDERS. THE PRESENT INVENTION CONCERNS A CYLINDER HEATED BY AN ELECTRICAL RESISTANCE IN OIL BATH, FOR THE HEAT TREATMENT OF FABRICS OR PAPERS. THE CYLINDER CONSISTS OF A HOLLOW CYLINDRICAL ROLLER 2 EQUIPPED WITH AN ELECTRICAL RESISTOR 3 AXIALLY ARRANGED. THIS RESISTOR IS IMMERSE IN AN OIL BATH 7 WHICH DOES NOT COMPLETELY FILL THE INTERIOR CAVITY OF THE ROLLER, AND WHICH MAKES A UNIFORM DISTRIBUTION OF HEAT ON THE SURFACE OF THE ROLLER. THE INVENTION IS APPLIED TO THERMO-PRINTING MACHINES FOR FABRICS, CALENDERS OR ROWERS EQUIPPED WITH A FINAL CALENDER.

Description

253574 th

  CYLINDER HEATED BY AN ELECTRIC RESISTANCE, ESPECIALLY FOR

  TISSUE THERMO-PRESSING MACHINES AND FOR CALANDERS -

  The present invention relates to a cylinder heated by a resistor

  electric oil bath, especially for the-

  fabric printing, for final ironing calenders

  above or similar, and for rowers equipped with a final grille.

  As is known, in several sectors of the industry, such as the textile sector or the stationery sector, it is necessary to heat-treat the fabric or paper, in order to obtain the desiccation of an impression or heat-setting. tissue, or for the purpose of stabilizing

  the product before successive treatments.

  Currently, heating rolls are used which can not ensure a constant and uniform distribution of heat over all

their surface.

  This results in a significant alteration of the qualities of the treated product.

  Therefore, the object of the present invention is to overcome

  above-mentioned disadvantages by providing a cylinder, heated by means of oil bath electrical resistances, to obtain a uniform distribution of heat over the entire surface of the roll in order to obtain heat-fixing of the fibers of the fabric. polyester or sublimation thermoimpression, in an absolutely uniform way,

  without differences in treatment caused by a non-uniform temperature

form of said roll.

  On the other hand, the invention aims at producing a heated cylinder which is very simple and which does not require accessory elements capable of

  cause local cooling in the heating circuit.

  Another object of the invention is to provide a heated cylinder

  putting high surface temperatures, with a

  very low energy consumption, and whose constructional characteristics

  guarantee a high degree of operational safety and usability.

tion.

-2-

  For this purpose, the present invention relates to a heated cylinder of the gen-

  mentioned above, characterized in that it comprises a roll cy-.

  hollow cylindrical, equipped with an electrical resistance arranged axially

  and immersed in a bath of oil that does not completely fulfill the

the inner life of the roll.

  Other features and advantages of the heated cylinder according to

  invention will be more readily apparent from the detailed description of a

  preferred embodiment, given below by way of example, and with reference to the accompanying drawing, in which:

  FIG. 1 is an axial sectional view showing the heated cylinder

  according to the present invention, and

  Figure 2 is a sectional view along the line II-II of Figure 1.

  Referring to FIGS. 1 and 2, the heated cylinder 1 comprises a

  cylindrical roller 2 whose interior is hollow.

  An electrical resistance 3, preferably of the shielded type, is arranged axially inside the roller 2. It is electrically connected to sliding contacts 4, for its power supply during

the rotation of the cylinder.

  The resistor 3 is housed inside a tubular core core 5 having a series of radial holes 6, which put in communication

  the inside of the tubular core 5 with the cavity of the roll 2.

  This cavity contains an oil bath indicated by 7, whose level

  is enough to keep the water resistance completely immersed

  tance 3, even while rotating the roll, without filling the entire

roller cavity 2.

  Closed cells 10 are arranged around said tubular core 5, in the form of hollow elements in which the oil can not penetrate) and whose main function is to reduce the amount of oil

  necessary inside the roll.

  During the rotation of the cylinder oil, heated by conduction at

  electrical resistance 3, is distributed uniformly

  close to the inner wall of the roll, so as to obtain-

  uniform heating of the working surface of this roll.

  During the rotation of the cylinder, there is a natural circulation of the oil which from the tubular core 5 flows through the holes

  6 to the inner wall of the roller 2 so as to obtain a trans-

  fast mission of the heat between the resistance and the active surface of the roll, by preventing undesirable thermal dispersions and by

  also promoting an even distribution of heat.

  The dispersion described above also makes it possible to obtain temperatures

  superficial tures, even of the order of 3000 C with

reduced electrical

  The operation of the heated cylinder according to the present invention is

very simple.

  In fact, during the normal operating phases, the

  resistance 3, which heats the oil quickly and evenly

  the inside of the tubular core 5.

  This oil under the effect of natural circulation caused through

  the holes 6 by the rotation of the cylinder, carries the heat directly-

  towards the active surface of the roller thus ensuring a

  Fast and uniform heat and high productivity.

  An important aspect of this embodiment is the presence of

  voles 10 which are areas in which the oil can not

  penetrate> which greatly reduces the amount of oil needed and

  makes it possible to obtain rapid cooling of the cylinder, after using

tion.

  The foregoing description shows that the present invention fulfills the

goals mentioned above.

  In particular, it can be seen that the heated cylinder according to the present invention

  invention benefits from a uniform and consistent superficial

  of heat transmitted to the active surface of the cylindrical roller.

  by the circulation of the oil, which occurs naturally under the effect of the rotation of the cylinder. Since the oil is contained in the closed interior cavity

  of the roller, it is not necessary to use circulation pumps.

  level compensating tanks, since the pre-existing level

  established oil is fixed once and for all to the manufacture of

  In this way, the oil can not flow and damage the treated products.

  The described embodiment is susceptible of numerous modifications.

  obvious variations and variations for those skilled in the art without departing

framework of the invention.

-5-

Claims (4)

claims   1 Cylinder heated by electric resistance in an oil bath,   characterized in that it comprises a hollow cylindrical roller (2) equipped with an electrical resistance (3) arranged axially and immersed in an oil bath (7), which does not completely fill the internal cavity of the roll.   2 Cylinder according to claim 1, characterized in that Jadite re-   electrical resistance (3) is housed inside a tubular core (5)   communicating with said interior cavity.   3 Cylinder according to claim 2, characterized in that said tubular core comprises a series of radial holes (6), for the passage of   the heated oil to the surface of said roll (2).   4 Cylinder according to one of the preceding claims,   characterized in that it comprises inside said roll (2) a se-   of closed cells (10) without oil, arranged in such a way as to   reduce the amount of oil needed inside the roll.   Cylinder according to one of the preceding claims, characterized   characterized in that the circulation of the oil inside said wheel   water (2) takes place in a natural way during the rotation of the cylinder. heated.