DE2354281A1 - THERMAL INSULATING AND NON-DEFORMABLE STRUCTURE FOR A PRESS HEATING PLATE - Google Patents

Description

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'. DIPl.ING, DIETiIICH LEWALD 1 O C / O O 1

ρ 8541 M ** MTA »wAt? 2354281

8 MUNICH 4Ö,

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IiE JOINT PRANCAIS 10, rue de la Baume, 75008 PARIS, (France)

THERMAL INSULATING AND NON-DEFORMBAKE STRUCTURE PURE ONE

PRESS HEATING PLATE ■. ·

The invention relates to a thermally insulating and Non-deformable structure for a press heating plate, especially "intended for the molding of plastics.

As is well known, it belongs to a molding press for elastomers and thermosetting materials, in particular, have a rigid framework a cylinder with a movable beam inside permanently connected piston runs, the first side of which can face a beam firmly connected to the frame and whose the second side carries a heating plate.

The press also includes a plate with a complementary shape to the aforementioned shape, this plate is supported by a fixed beam.

To avoid that a bar is in a wake of the presence heated by the heating plate belonging to it, one sees them with a thermally insulating structure. Such a structure must absolutely be indeformable, so that the parallelism between the two mold plates, which are opposite each other, is always maintained with any printing.

The thermally insulating structures used to this day consist of 15 to 25 mm thick panels made of materials which can be of two types:.

"- Asbestos-cement boards ■

- to plates formed layer materials based on glass and resin _tissues; ·

The asbestos-cement panels are inexpensive, have a good thermal insulation coefficient, but are Fragile, because since they are relatively porous, they will be used in the event each closing process of the pre, sse; deformed and compressed j they slowly crumble during theirs. Use time and need to be replaced from time to time.

The panels made of laminates based on glass and resin fabric withstand greater resistance without any signs of wear Loads than the asbestos-cement panels, but they are unstable at high temperatures and also very expensive.

The invention is intended to overcome these disadvantages and a Create insulating structure for press plates that are exposed to high temperatures and high pressures is undeformable and acceptable prime costs enables.

409821/1036 ./.

The invention relates to a structure for the thermal insulation of a press plate from its fastening beam; these Structure is characterized according to the invention in that it from a variety of filler spacers Polyimide, which are arranged between the plate and the beam.

According to a particularly advantageous exemplary embodiment According to the invention, these spacers are in openings, which has a screen made of a heat-insulating material, the thickness of which is less than the height of the spacers

Further characteristics and advantages of the inventive Structure will become clear in the course of the following description with reference to the accompanying figure. In the figure, schematically shown in section a press that has a heat insulating has structure according to the invention.

This press, which is used to mold elastomers and thermosetting materials, has a rigid frame 1 with a cylinder 2, in the interior of which a piston 3, which is permanently connected to a movable beam 4, moves. This One side 6 of the bar 4 lies opposite a fixed bar 7. Furthermore, the bar 4 has a side 5 on which with A heating plate 9 is attached to a mold 8 by means of rods 12 is.

The complementary form and the bars assigned to it and the heating plate of the complementary form are not shown in the figure.

409821/1036

A heat-insulating layer is applied between the movable beam 4 and the heating plate 9 and consists of spacers 11 made of polyamide provided with long glass fibers. These spacers lie in openings which are provided in a thin, heat-insulating screen 10, for example made of wood cement, the thickness of which is less than the height of the spacers 11. The screen is applied to the beam 4. The spacers are clamped between the beam 4 and the heating plate 9 with the aid of the fastening rods 12. Their height is preferably less than their diameter, and their cross-section can be any. They are evenly distributed over the surface _s of the heating plate so they are taking that about a tenth of that plate.

Example - diameter of a spacer: 25 mm

- High 10 mm

- the surface occupied by the spacers

Hotplate $ 15 of the total

Heating plate surface

- thickness of the screen; 2 mm

A heat insulating layer according to the invention has the following remarkable properties:

- it is stable up to temperatures of about 200 ° C;

- The use of spacers makes it possible to 'reduce the load-bearing surface of the insulating material and thus reduce the heat exchange between the heating plate and the support beam. ringein j the temperature of the bars can be reduced by about 30 ° in this way °,

409821/1036 /

- It has excellent mechanical strength

Pressure on _s comparable to that of steel, and no deformation of any kind can be observed with repeated applications of pressures of around 300 to 400 bar. Therefore, the parallelism of the support plates for the forms is preserved

Such mechanical strength could be achieved with the help of spacers, for which the dimensions were given above, for example. "It can be stated that the use of * spacers with a height of about 10 mm instead of an insulating plate with a thickness of about 15 to 25 mm, an increase in the usable opening width of the press is possible! furthermore allows selected by the spacers ratio of diameter to H "dhe _s to vermeideno- the risk of kinking and flow..> ~ ~ ■

After all, the cost of a heat insulating one structure according to the invention not higher than that of previously known Thermal insulation ο

In the context of the invention, the use of. Screen 10 is a preferred embodiment of the heat insulating Structure »However, you can also click. do without the umbrella, so that the structure consists only of polyimide spacers provided with glass fibers consists.

The structure according to the invention can. Used everywhere there where thermal insulation of walls is required will be exposed to high pressures.

-Patent claims-409821/103 6

Claims (4)

PATENT CLAIMS /! 1. / heat-deformable structure for the thermal insulation of a heating plate of a press from a beam to which the heating plate is attached, characterized in that this structure consists of a large number of filled polyimide spacers (11) which are inserted into openings in a screen (10 lie) of preferably warmeisolierendem _s material wherein the layer thickness of the screen is less than the height of the distance pieces. 2. Structure according to claim 1, characterized labeled in ze ichne t _s that the Abstandsstttcke (11) has a ratio of height to diameter of less than 1 have " 3. Structure according to one of the preceding claims, characterized in that the printing surface Lache the Abs tends pieces (11) is about a tenth of the surface area of the heating plate (9). 4. Structure according to one of the preceding claims, characterized in that the screen (10) consists of wood cement « 409821/1036