Food Sachet or Container

Inactive Publication Date: 2008-01-03
VALLID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] According to the present invention, there is provided a sachet or food container formed of two plastics sheets joined to one another around the edges of an internal pocket of the sachet or container by welded seals, wherein the compositions the two plastics sheets differ one from the other and are selected such that the strength of the seals is controllable by varying at least one welding parameter selected from temperature, pressure and dwell time, and wherein the two sheets are welded to one another using a first set of welding parameters to produce strong seals in some of the seam regions bounding the internal pocket, while other seam regions bounding the pocket are welded using a second set of welding parameters to produce weak seals at which the sachet will burst open preferentially when the pocket is pressurised.

Problems solved by technology

Thus while welding polypropylene to itself and easy peel materials to themselves did not produce satisfactory result, good results were obtained by welding a polypropylene layer to an easy peel layer.

Method used

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  • Food Sachet or Container

Examples

Experimental program
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Embodiment Construction

[0023] The sachet 10 shown in the drawings is essentially the same as that disclosed in WO2004 / 019741 to which reference may be made for a more detailed explanation of the sachet and the manner in which it is used in a beverage dispensing machine. The sachet 10 is formed of two plastics sheets 12, 14 welded to one another along seams 22 to define a sealed pocket 20 filled with a granular beverage material 18, such as ground coffee, tea leaves, or chocolate or soup powder.

[0024] A spacer 16 is provided to keep the two sheets 12, 14 apart and hot water injected into the spacer 16 passes into the pocket 20 through radial passages in the spacer 16 and contacts the powder 18. The spacer 16 is designed to prevent the brewed beverage from contacting the needle that injects hot water into the sachet to prevent contamination of the needle. As the pocket 20 fills with hot water, the pressure in the pocket rises until a point is reached when a weak seal region 24 along the seam 22 ruptures an...

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Abstract

A sachet or food container is formed of two plastics sheets joined to one another around the edges of an internal pocket of the sachet or container by welded seals. The compositions of the two plastics sheets differ one from the other and are selected such that the strength of the seals is controllable by varying at least one welding parameter selected from temperature, pressure and dwell time. The two sheets are welded to one another using a first set of welding parameters to produce strong seals in some of the seam regions bounding the internal pocket, while other seam regions bounding the pocket are welded using a second set of welding parameters to produce weak seals at which the sachet will burst open preferentially when the pocket is pressurised.

Description

FIELD OF THE INVENTION [0001] The present invention relates to the manufacture of sachets for use in a beverage machine and of packets and containers for enabling food to be heated in a microwave oven. BACKGROUND OF THE INVENTION [0002] Beverage machines are known which inject a liquid, usually hot water, under pressure into a sachet having a sealed pocket containing an infusible product, such as ground coffee or tea leaves, or soluble solids such as hot chocolate powder or granules. The sachet bursts under the pressure of the injection water and a beverage is dispensed into a cup. One example of such a pressure rupturable sachet is to be found in GB 2392374. [0003] It is desirable to design sachets of this kind such that they will always burst in the same place and dispense the beverage in a controlled manner. This is in order to avoid soiling the machine itself, the outside of the dispensing cup or the machine operator. [0004] The same requirement for a controlled release of the p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D75/30B65D75/58B65D85/804
CPCB65D75/30B65D85/804B65D75/58
Inventor WINSLOW, JOHNBARNES, KENNETH EDWARDJANSEN, BARRY
Owner VALLID
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