Unlock instant, AI-driven research and patent intelligence for your innovation.

Package provided with a rigid lid and a valve, in particular for cooking food

a technology of rigid lids and valves, which is applied in the direction of functional valve types, containers, packaged goods, etc., to achieve the effect of convenient opening of the lids

Inactive Publication Date: 2003-10-02
PROPLAST
View PDF8 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The solution proposed by the present invention gives results that are similar to those obtained by the valve of document WO 01 / 09003 in terms of operation and venting. However, it has the merit of being even simpler and thus less expensive, even though it is more limited in terms of application.
[0023] In a particular embodiment, making it easier to open the lid, the package includes a tab fixed to or extending the flexible sheet or the label type flat element. By pulling on the tab, the user can detach the flexible sheet from the lid, thereby uncovering the opening zone in the lid, which has the effect of putting the inside of the package at atmospheric pressure.

Problems solved by technology

However, it has the merit of being even simpler and thus less expensive, even though it is more limited in terms of application.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Package provided with a rigid lid and a valve, in particular for cooking food
  • Package provided with a rigid lid and a valve, in particular for cooking food
  • Package provided with a rigid lid and a valve, in particular for cooking food

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0032] The package 1 in the first embodiment shown in FIG. 1 is constituted by a jar 2 and by its rigid or semi-rigid closure lid 3, suitable for screwing in leaktight manner onto the top portion 2a of the jar 2. The lid 3 is pierced by an orifice 4 which is designed to allow the gas which is produced in the inside portion 5 of the package 1 to escape while the substances 6 contained inside the jar 2 are being subjected to heat treatment.

[0033] The orifice 4 made in a flat portion of the lid 3 is a circular hole having a diameter of several millimeters, preferably being about 7 mm, which corresponds to a section of about 38.5 mm.sup.2.

[0034] A flexible sheet 7 is placed over the orifice 4, and in the example shown the sheet is of rectangular or square configuration. The flexible sheet 7 is preferably fixed solely along two side zones 7a, 7b adjacent to two opposite sides 8a and 8b of the sheet 7 on either side of the orifice 4. The sheet 7 is fixed by an adhesive coating 9 interpose...

second embodiment

[0047] In a second embodiment as shown in FIG. 4, the lid 3 is provided on its inside face 14 with a porous element 15 which is fixed over the orifice 4. The porous element 15 is designed to allow gas to vent from the inside portion of the package while preventing any possibility of contamination between the valve 12 and the substances contained in the package. This porous element 15 must therefore be impermeable to liquids.

third embodiment

[0048] In the third embodiment shown in FIG. 5, the flexible sheet 7 is not fixed to the lid 3, but to a label 16 which is used for informing the consumer about the substance contained in the package. The flexible sheet 7 is fixed to the label 16, for example, by sticking the top face 7c of the flexible sheet 7 to the bottom face of the label 16. The label 16 is in turn fixed in part to the lid 3 so as to leave at least one unfixed zone. While the valve 12 is in operation, the exhaust channel formed through the sealing treatment in the liquid state extends between the orifice 4 and the edge of the sheet 7a which faces the unfixed zone of the label 16.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The package is closed by a lid and it is fitted with a valve fixed over an opening zone of section greater than 10 mm<2>, and preferably lying in the range 30 mm<2 >to 50 mm<2>, leading to the inside of the package and formed through said lid. This opening zone is either an orifice formed through a flat lid, or else a hollow chamber itself pierced by a vent orifice of small size. The valve comprises solely a flexible sheet extending over the opening zone together with a sealing compound disposed between the flexible sheet and the lid. The sealing compound is solid at ambient temperature and it passes to a non-sticky liquid state when its temperature is raised. During heat treatment, the valve opens and closes in a succession of venting sequences. The valve opens under the effect of the pressure inside the package increasing sufficiently to create an exhaust channel through the sealing compound in the liquid state spread between the lid and the flexible sheet, said channel extending between the opening zone and an edge of the flexible sheet. After partial venting through the exhaust channel, and while the pressure inside the package is still greater than the pressure outside it, the valve is caused to close by said exhaust channel closing due to the cohesion forces between the sealing compound in the liquid state and both the lid and the flexible sheet. On cooling at the end of heat treatment, the sealing compound solidifies and fixes the flexible sheet to the lid, thereby locking the valve in its closed position.

Description

[0001] The present invention relates to a package fitted with a valve, in which package a substance is subjected to heat treatment that causes gas to be given off, said valve being in communication with at least one orifice leading into the package and co-operating with a sealing compound to enable venting to take place through said orifice during the treatment, while also preventing air from returning at the end of treatment. Such a package is usable in a very wide variety of fields such as cooking food, sterilizing equipment for single use in the medical field, and packaging pharmaceutical, medicinal, or cosmetic preparations.[0002] Document WO 01 / 09003 discloses the package of that type in which the valve is constituted by a base, a flexible sheet, and a sealing compound. The base has a hole in its center and it is totally fixed to the wall of the package so that the hole lies over the vent orifice formed through said wall. The flexible sheet is fixed in part to the base, for exa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B65D51/16B65D77/22B65D81/34F16K17/38F16K24/04F16K31/64
CPCB65D51/1644B65D77/225B65D81/3415F16K24/04B65D81/3453B65D2205/00F16K17/38B65D81/343
Inventor CROSS, ANTHONY BERNARDGUITTON, DIDIER
Owner PROPLAST