Advantageously recyclable environment-friendly thermal insulation box

Abstract

An advantageously recyclable environment-friendly thermal insulation box includes an inner box, an outer box and an insulation layer. The inner box has a sealed bottom, a peripheral wall, and a top opening having an engaging edge formed therearound. An engaging groove is provided between the engaging edge and the peripheral wall. The outer box includes a closed bottom and an open top provided with an engaging protrusion. Through engagement of the engaging protrusion with the engaging groove, the outer box is externally connected to the inner box with an enclosing space formed between the two boxes for receiving the insulation layer therein. The inner and outer boxes are made of a PP or an HDPE material, and the insulation layer is made of an EPE material, allowing the no longer usable thermal insulation box to be directly recycled to produce plastic pellets with good mechanical properties and accordingly higher value.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a thermal insulation box, and more particularly to a thermal insulation box that includes an insulation layer made of a specially selected material, so that the thermal insulation box, after becoming no longer usable, can directly undergo a recycling process to produce plastic pellets with good mechanical properties.BACKGROUND OF THE INVENTION[0002]Foodstuffs are in contact with air during logistic transportation thereof, which allows microorganisms present in the foodstuffs to multiply abnormally quickly and results in stale or even rotten foodstuffs. For the foodstuffs to maintain fresh longer, the foodstuffs are usually stored in a thermal insulation box during the logistic transportation, so that they are always in a low-temperature environment to lower the probability of becoming rotten.[0003]Most of the currently commercially available thermal insulation boxes include an insulation layer made of an expandable polysty...

AI Technical Summary

Benefits of technology

[0006]A primary object of the present invention is to provide a thermal insulation box that is made of particularly selected plastic materials, enabling the thermal insulation box, when it is no longer usable, to undergo a recycling process without the need of considering the structural composites thereof, and plastic pellets with good mechanical properties can be produced from the recycled thermal insulation box.

[0013]The thermal insulation box of the present invention is characterized in that the insulation layer is made of an EPE material and the inner and outer boxes are made of a PP material, allowing the no longer usable thermal insulation box to undergo a recycling process without the need of considering the structural composites thereof, and plastic pellets with good mechanical properties can be produced from the recycled thermal insulation box of the present invention.

[0014]Further, with the auxiliary layer made of the HDPE material being disposed in the enclosing space between the insulation layer and the outer box, it is able to lower the heat transfer efficiency of the insulation layer and therefore upgrade the insulation effect of the thermal insulation box.

Problems solved by technology

Foodstuffs are in contact with air during logistic transportation thereof, which allows microorganisms present in the foodstuffs to multiply abnormally quickly and results in stale or even rotten foodstuffs.

However, in a recycling process, the EPU material undergone a heating procedure is not reusable.

The EPS material for the insulation layer has relatively poor compatibility with plastic products from polyolefin polymers.

Therefore, when the thermal insulation boxes are recycled, the EPS material will remain in the recycled plastic pellets, making the recycled plastic pellets brittle and not endurable for use to have only low market value.

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