Method for homogeneously heating products

A technology for uniform heating of products, applied in the fields of dielectric heating, food preservation, food science, etc., can solve the problem of uneven heating of products or tubes, etc.

Inactive Publication Date: 2012-02-29
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Non-uniform heating of the cross-section of the product or pipe;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Example: heater tube for liquid suspension

[0036] 100 kg of fruit preparation comprising strawberries, sugar and gelling agent are conveyed through the HF heater tubes. A quartz glass tube was used as a heater tube, on which an aluminum electrode to which an HF field was applied was mounted externally. In a first test, a fruit preparation was pumped through an HF field. Owing to the high product viscosity and the associated longer product residence time, an excessively high temperature of 30° K occurs on the inside of the quartz glass tube compared to the core flow.

[0037] In order to sufficiently heat the product in the core flow, the delivery rate must be adjusted so that a temperature of 70°C is obtained internally. Here, temperatures above 100° C. are reached on the tube walls, which seriously impairs the quality of the fruit preparation.

[0038] In the second test carried out according to the method of the invention, a double set of quartz glass tubes was u...

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PUM

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Abstract

The invention relates to a method for heating product uniformly. The product is heated in electrical and magnetic field, in particular the HF filed. The first area of the product is more intensely heated than the second area through the alternating field. The invention is characterized in that the first area is cooled before or during heating at least in the alternating field through additional manner and / or measure for heat transmission and the second area is heated through the additional manner and / or measure for heat transmission. When the method of the invention is used to heat in high frequency electric and magnetic field, the uniformity of the temperature distribution of food, medicine and / or cosmetic is realized.

Description

technical field [0001] The invention relates to a method for homogeneous heating of products, in particular for homogenizing the temperature distribution in foodstuffs, medicines and / or cosmetics when heated in a high-frequency alternating electromagnetic field. Background technique [0002] Heating methods are required in order to degerm foods or pharmaceuticals to make them durable. An example is the pasteurization or sterilization of food products, eg preservation in glassware or jars. [0003] Methods for heating the product using heat exchangers or steam autoclaves are known. Thus, for example, milk is heated during pasteurization in a plate heat exchanger, held at pasteurization temperature for a certain period of time, and then cooled again. This method is suitable for liquid food and has been proven for a long time. [0004] Packed with vegetables, fruit, fast food (Fertiggerichten), one-pot cooking (Eint pfen) or similar contents are heated almost exclusively i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B6/46A23L3/005
CPCH05B6/62A23L3/005
Inventor P·艾斯纳T·普法伊费尔
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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