Compression-moulded tray and method of producing a fibre tray

a technology of compression moulding and fibre material, which is applied in the direction of packaging foodstuffs, packaging goods types, containers for heating food, etc., can solve the problems of bacteria and flavouring agents not being able to migrate through the packages, being very hot, and sometimes even impossible to hold in your hands, etc., to achieve the effect of improving function

Inactive Publication Date: 2009-12-31
SIG TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]By to the present invention, a tray with a considerably impro

Problems solved by technology

The handling of foodstuff put very high demands on the packaging.
They must meet the hygienic requirements, i.e. bacteria and flavouring agents should not be able to migrate through the packages to and from the surrounding environment.
They resist conventional ovens, but the disadvantages are that they become very hot and sometimes even impossible to hold in your hands.
Aluminum forms are also very fragile and cannot resist a great load.
Moreover, they cannot be put in a microwave oven
An essential disadvantage with solid or foamed plastic trays is that they cannot be put in a conventional oven, since they will then melt.
The choice of material suggested in the U.S. patent for the forming pulp is however not optimal for the manufacturing process and results in a formed tray lacking in function.
Moreover, there is no specification of the pulp, only how the machinery works.
Also, the described manufacturing process and assembling have some flaws like low and uneconomical production rate, large areas that have to be well sealed against air

Method used

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  • Compression-moulded tray and method of producing a fibre tray
  • Compression-moulded tray and method of producing a fibre tray
  • Compression-moulded tray and method of producing a fibre tray

Examples

Experimental program
Comparison scheme
Effect test

examples

Tested Materials

[0055]Polyester-laminated fibre trays formed of CTMP from a suspension. The dimensions of the trays were 173×117×30 mm.

Testing

[0056]Surface weight measurements were performed according to ISO 536:1995. Samples were taken from the bottom and the side walls of the trays.

[0057]Measurements of the thickness and density were performed according to ISO 534:1998. Samples were taken from the bottom and the side walls of the trays.

[0058]Measurements of the tear strength were performed according to ISO 1974:1990. Samples were taken from the bottom and the side walls of the trays.

Absorption of Water

[0059]A. The weights of the trays were measured, after which the whole tray was submerged under water for 60 seconds. After drainage of the water and drying in air for 1 minute, the tray was weighed again. The gain in weight was reported.

[0060]B. The weights of the trays were measured, after which they were filled with 5 dl of water and were left to stand in room temperature for 24 h...

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Abstract

A compression-moulded tray of fibre material, said tray being formed of fibre material in a compression method, from a suspension of mechanical pulp of cellulose. The formed tray has been formed by press-drying using heat to a dry content of 80-95%, preferably 90-95%, and the fibre material of the formed tray has a density in the order of 400-650 kg/m3. The inside of the tray is provided with a protective barrier.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a compression-moulded tray of fibre material, said tray having an opening, an inside and an outside.BACKGROUND[0002]The handling of foodstuff put very high demands on the packaging. They must meet the hygienic requirements, i.e. bacteria and flavouring agents should not be able to migrate through the packages to and from the surrounding environment. In some cases the tray should even be gas tight, i.e. for chilled food for long storage or fresh meat in modified atmosphere. They should have enough strength to resist the handling during storage and transport. Tough environmental demands are also put on the packaging, i.a. as to recycling, composting or burning of used packages.[0003]It has become more and more common with ready-cooked food dishes, and in addition to serving as a package for storage of the foodstuff, there are also requirements that it should be possible to put the packages directly into a microwave oven or a...

Claims

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Application Information

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IPC IPC(8): B65D81/34D21J3/00
CPCB65D1/34D21J7/00D21J3/00B65D81/34
Inventor SUNDBLAD, PERSODERLUND, ROGERNORDIN, BENGTBLECKO, LARS
Owner SIG TECH AG
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