Basic information about membrane press
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Basic information about membrane press

Views:3     Author:Site Editor     Publish Time: 2019-12-13      Origin:Site

Membrane press

2580F - 副本

In membrane presses, coating materials such as veneer, thermoplastic films or transfer finish foils are pressed to pre-glued, profiled surfaces or shaped parts.

Technical principle

Before processing in the press, the workpieces have to be prepared. This includes the application of an adhesive layer - e.g. by a spraying device or by rollers - with prior cleaning of the adhesive surface (e.g. with brushing machines). The adhesive is then dried and later in the press activated by heating. If self-adhesive films are used, the application of glue to the workpiece is deleted.

The prepared workpiece is further processed as follows:

Placing of the pieces on the machine table

The workpiece edge should be completely enclosed, so supports are necessary, which are slightly smaller than the pieces themselves. Supports are not needed when using a pin-System.

When an optimization software is available, table top and film can be used as best as possible.

Covering the table with the film and separation from the role or covering the workpieces with veneer.

The film is removed from the film magazine - either manually or with a film unrolling device - and after covering the table it is usually cut off by a foil cutting device.

Moving of the table into the press (manually or automatically)

Pressing process according to the chosen principle (see: operating principles of membrane presses)

Coating material and workpiece are heated, thus the glue is activated, the thermoplastic film becomes deformable.

During the pressing, the coating material adapts to the surface of the workpiece.

Adhesive or film harden when cooled, wood material and coating are now connected to each other.

The table moves out of the machine after the pressing process, the workpieces are turned over.

Possible feeding systems, see: machine table

Removing of protruding pieces of film.

manually or automatically using a cutting station

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thermoplastic film

Film that is deformed when reaching a certain temperature. Used for coating derived timber panels (e.g. on mould presses or membrane presses).

Examples

PVC film

oil and acid resistant

contains harmful pasticizers

melting temperature: 120 °C

ABS film

high surface hardness

oil resistant

melting temperature: 105 °C

PP film

properties heavily influenced by fillers

high temperature resistance (up to 110 °C)

melting temperature: 160 °C

Transfer-Finish-Film

The real processing temperature is below the melting temperature and is indicated by the film manufacturer.


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