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Method and device for the production of moulded pieces from a layer of polyurethane

A polyurethane layer and molded parts technology, which is applied in the direction of spraying device, liquid spraying device, coating, etc., can solve the problem of adding reaction mixture to the coating mechanism or spraying mechanism, and achieve low consumption of raw materials, small cycle time and fast cycle time The best effect

Active Publication Date: 2010-02-17
HENNECKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But after this necessary injection interruption, the injection system must maintain full working capacity, that is, it is not allowed to add the reaction mixture in the coating mechanism or injection mechanism during the injection interruption

Method used

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  • Method and device for the production of moulded pieces from a layer of polyurethane
  • Method and device for the production of moulded pieces from a layer of polyurethane
  • Method and device for the production of moulded pieces from a layer of polyurethane

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Embodiment Construction

[0093] exist figure 1 A device 1 with a mixing head 2 and a spray nozzle 3 (which acts as a spray device comprising an arc 4 of 90°) is shown for spraying the polyurethane reaction mixture onto a substrate 5. The reaction components polyol A and isocyanate B are conveyed from a storage container via a metering device (not shown in the schematic diagram) via connecting pipes to a high-pressure mixing head 2 where they are mixed with one another. Next, the reaction mixture is extruded through the flow channel of the spray nozzle 3 (with an arc of 90°) and is applied in the jet 6 on the substrate 5, which here means has distinct dimples and inverted The tool surface of a tool with recesses (i.e. inaccessible pockets).

[0094] The sprayed reaction mixture reacts on the tool surface (substrate 5) to produce a skin 7, which can then be post-foamed in a subsequent processing step (not shown in the diagram), or can be further e.g. Processed into shaped parts for the automotive indu...

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Abstract

The invention relates to a method and a device for the production of moulded pieces comprising a layer of polyurethane by spraying, wherein a gas stream is introduced into the flow channel (11) of the spray device (3) in at least two positions.

Description

technical field [0001] The invention relates to a method and a device for producing molded parts comprising a polyurethane layer during an injection operation, wherein a gas flow is introduced into the flow channel of the injection device at at least two points. Background technique [0002] If it is a case where reactive plastics such as polyurethane are to be applied evenly on the substrate, at least spraying is used as an application technique. In highly reactive raw material systems, especially in injection operations, so-called high-pressure mixers are used, followed by special injection nozzles. An example of such an injection system is described in EP 0303305B1. [0003] Since such jet mixing heads are usually controlled by a robot which has to perform extremely fast movements, it is particularly advantageous for the jet mixing head to be constructed small and (and thus also) light. [0004] However, for three-dimensional injection layers, especially for molded part...

Claims

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Application Information

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IPC IPC(8): B05B7/00
CPCB05B7/0475B29K2075/00B29C41/08B05B7/0491B29C67/246B05B7/0458
Inventor W·波利克D·奥贝洛尔I·克莱巴
Owner HENNECKE
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