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Apparatus for continuous heated pressing of material in sheet form
| Details |
Inventors: Held, Kurt;
Assignee:
Primary Examiner: Woo; Jay H.
Assistant Examiner: Bushey; C. Scott
Attorney, Agent or Firm: Toren, McGeady & Associates
For the continuous pressing of sheet material in a reaction zone between two endless, heated press belts of a double band press at increased process temperatures, the capability for operating at process temperatures which are higher than critical, permissible operating temperatures of the double band press is achieved by heating the press belts in such a way that they have the highest temperature at their outsides facing the sheet material with heat flow through the press belt being effected from the hot outer side to the opposite inner side of the press belt. The heat flow direction in the reaction zone which otherwise leads from a pressure plate to the press belt outer side is thus reversed and, heating members are arranged in the vicinity of the press belt on the outer side thereof shortly before the reaction zone. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Referring now to FIG.
1, there is shown, in perspective, apparatus in accordance with the present invention.
In FIG.
1, there is shown the intake zone of a double band press 2 which is utilized for hot pressing of a forwardly moving material sheet 1.
The material sheet 1 can be a plastic material-bound laminate, e.
g.
, an electrolaminate or also a fiber binding agent mixture, wherein the binding agent is a thermoplast with a melting point between, for example, 250.
degree.
and 350.
degree.
C.
In the area of the intake zone, the double band press 2 is formed with two deflecting drums 5 and 6 which are arranged one above the other and which are rotatably supported in bearing supports 3 and 4, respectively.
An endless press belt 7 and 8 is respectively guided around each drum 5, 6.
The press belts 7, 8 extend in a manner known per se over additional deflecting rollers (not shown) which are likewise supported on the bearing supports 3, 4.
As shown in the drawings and also in FIGS.
2 and 3, each press belt 7, 8 consists of a press belt pack which is formed in each instance from four belt sides or layers 11, 12, 13, and 14, in the case of the deflecting drum 5, and 15, 16, 17, and 18, in the case of the deflecting drum 6.
The four sides of each of the press belt packs are pressed into one another.
The belt sides 14 and 18, respectively, comprise in each instance the outer side or surface of the individual press belt pack and they engage, respectively, on opposite sides of the material sheet 1 in the area of the reaction zone 10, as shown in FIG.
1.
The rotating direction of the individual press belts is indicated by arrows A in FIG.
1.
The material sheet 1 advances from right to left, as seen in FIG.
1, and is compressed in the reaction zone 10 accompanied by the simultaneous application of heat and pressure.
The deflecting drums 5, 6 are heated in a manner known per se so that the heat is transferred from the drums to the multilayered press belts 7, 8
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