DE102010037638B4 - Heat-insulating and naturally degradable container - Google Patents

Abstract

A heat-insulating and naturally-degradable container comprising a paper container (10) having an inner surface (11) in contact with the food or beverage and an outer surface (12), a water-proofing layer (20) formed as a film the inner surface of the paper container (10) is laminated and formed by a mixture of hydrous magnesium silicate, resin and calcium carbonate, and a foam layer (30) which is formed only on at least a part of the outer surface of the wall (13) and from a liquid binder and heat-resistant foam particles, wherein a mixture of liquid binder and heat-resistant foam particles is applied to the outer surface of the container, wherein the heat-resistant foam particles are foamed by heat and form the foam layer, wherein the liquid binder by polyvinyl acetate resin, ethylene n-vinyl acetate resin, polypropylene resin or mixture thereof, and wherein the heat-resistant foam particles are formed by a thermoplastic polymer comprising a low boiling point solvent.

Description

Technical area

The invention relates to a container, in particular a heat-insulating and naturally degradable container.

State of the art

The conventional paper container usually has a PE coating on the surface. If the container is thrown away after use, the PE coating can not be removed, so that the paper container can not be degraded naturally.

• (1) Die Polymilchsäure kann nicht in der normalen Umgebung abgebaut werden und muss in der geschlossenen Müllbearbeitungsfabrik mit Anaerobien behandelt werden, so dass die Rückgewinnungskosten hoch sind;
• (2) Die Polymilchsäure kann beim Abbau Methan erzeugen, das ein Treibhausgas ist, dessen Treibhauseffekt um einen Faktor 23 höher ist als der des Kohlendioxids, und somit das Treibhausproblem verschlimmern kann;
• (3) Die Polymilchsäure hat ein gleiches Aussehen wie PET und kann mit PET verwechselt und zusammen weggeworfen werden, wodurch das PET verschmutzt wird und nicht wiederverwendet werden kann;
• (4) Die Polymilchsäure ist aus Mais hergestellt, wodurch die Versorgung von Nahrungsmittel beeinflusst wird, so dass der Preis des Nahrungsmittels steigt.

To solve this problem, a biomass made from polylactic acid (PLA) from corn is used. Although the polylactic acid can be biodegraded and reused, in practice it has several limitations:

• (1) The polylactic acid can not be decomposed in the normal environment and must be treated with anaerobies in the closed refuse processing plant so that the recovery cost is high;
• (2) The polylactic acid can produce methane, which is a greenhouse gas whose greenhouse effect is higher by a factor of 23 than that of carbon dioxide, and thus can worsen the greenhouse problem;
• (3) The polylactic acid has the same appearance as PET and can be confused with PET and discarded together, which contaminates the PET and can not be reused;
• (4) Polylactic acid is made from corn, which affects the supply of food so that the price of the food increases.

Since the use of polylactic acid has several limitations, the use of polylactic acid in some countries is prohibited or not recommended.

Since polylactic acid is not the best solution for plastic and PS containers, the search for an environmentally friendly material is continuous. Therefore, it is an important task to develop a biodegradable and inexpensive container.

From the document DE 69 903 486 T2 For example, a heat-insulating paper cup is known which comprises a water-proofing layer of resin and a heat-insulating outer layer of foamed polypropylene resin, thereby achieving better insulation in printed areas. The document DE 60 207 862 T2 discloses a beverage container in which, for the purpose of isolation, the container wall comprises a paper web layer, a foam layer and a polymer shrink film layer. From the document US 2009 0 220 711 A1 a cup is known which consists of an outer foam cup and a paper cup received therein, wherein the inside of the foam cup is treated with heat so that the paper cup sticks directly thereto.

Object of the invention

The invention has for its object to provide a heat-insulating and naturally degradable container.

This object is achieved by the heat-insulating and naturally-degradable container of the present invention comprising: a paper container having an inner surface in contact with the food or beverage and an outer surface; a water-proofing layer formed by film lamination on the inner surface of the paper container and comprising water-containing magnesium silicate, resin and calcium carbonate; and a foam layer which is only on at least a part of the outer surface of the wall and made of a liquid binder and heat-resistant foam particles, wherein the liquid binder and the heat-resistant foam particles are mixed together and then applied to the outer surface of the container, finally thermally foam the heat-resistant foam particles and form the foam layer, wherein the liquid binder comprises polyvinyl acetate resin, ethylene-vinyl acetate resin, polypropylene resin or a mixture thereof, and wherein the heat-resistant foam particles include thermoplastic polymer enclosing a low boiling point solvent, includes.

The paper container, the water-proofing layer and the foam layer are all biodegradable. In addition, a water-tightness on the inside and a heat-insulating effect on the outside is achieved.

Brief description of the drawings

1 a sectional view of the invention,

2 an exploded view of the invention,

3 a perspective view of the invention.

Ways to carry out the invention

Further details, features and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Like from the 1 to 3 it can be seen, the invention comprises a paper container 10 , a water-proofing layer 20 and a foam layer 30 ,

The paper container 10 has an inner surface 11 which is in contact with the food or beverage, and an outer surface 12 on. In the present embodiment, the paper container 10 formed in the form of a cup and has a wall 13 and a floor 14 which form a receiving space for fluid such as water or the like. The water protection layer 20 is preferably on the whole inner surface of the wall 13 and the soil 14 formed so that the paper tray 10 has a waterproofness. The foam layer 30 is only on at least part of the outer surface of the wall 13 educated. That is, the foam layer 30 may completely cover the outer surface or form a three-dimensional structure on the outer surface.

The water protection layer 20 is by film lamination on the inner surface of the paper container 10 educated. In one embodiment, the water protection layer is 20 formed by a mixture of hydrous magnesium silicate, resin and calcium carbonate, wherein the proportion of hydrous magnesium silicate 15-40 wt .-%, the proportion of resin 2-10 wt .-% and the proportion of calcium carbonate 50-83 wt .-% is , In the present embodiment, the resin is an epoxy resin. In another embodiment, the water-proofing layer is 20 formed by a mixture of hydrous magnesium silicate, resin, calcium carbonate and polymer of alkenes, wherein the proportion of hydrous magnesium silicate 15-40 wt .-%, the proportion of resin 2-10 wt .-%, the proportion of calcium carbonate 50-83 wt .-% and the proportion of polymer of alkenes 10-70 wt .-% is. The polymer of alkenes may be polyethylene, polypropylene, polystyrene or their mixture. By this composition, the stretchability, the waterproofness, the aging resistance and the surface smoothness of the water-proofing layer are increased. At the same time a high thermal and chemical stability is achieved. Therefore, it is suitable as a water-proofing layer of a beverage container. In addition, the water-proofing layer is biodegradable by the above-mentioned composition and can be separated from the paper container. During combustion, no poison is generated, so that the environmental protection conditions can be met. In this water-proofing layer further IR particles or nanosilver particles can be mixed in, so that the water-protective layer has a bactericidal and fresh-preserving effect.

The foam layer 30 is made of a liquid binder and heat-resistant foam particles. The liquid binder and the heat-resistant foam particles are mixed together and then applied to the outer surface of the container. Finally, the heat-resistant foam particles foam by heat and form the foam layer. It should be noted that before the heat treatment, the coating of the liquid binder and the heat-resistant foam particles can be dried. As a result, the semi-finished products coated with the foam layer can be stacked and deposited. In the present embodiment, the liquid binder is formed by polyvinyl acetate resin, ethylene-vinyl acetate resin, polypropylene resin or mixture thereof. The heat-resistant foam particles are formed by thermoplastic polymer enclosing a low boiling point solvent. In the mixture of the liquid binder and the heat-resistant foam particles, a dye may be blended to form a color.

During foaming, the liquid binder is first softened. As the temperature is further increased, the solvent enclosed by the thermoplastic polymer gasifies, thereby expanding the thermoplastic polymer. Since the liquid binder is already softened and flowable, it can fill the gaps between the foam particles so that the foam layer has a lower surface roughness. Therefore, the surface of the foam layer can be printed. Since the foam layer has a dense structure and the air pores are closed, waterproofness can be achieved. The temperature of foaming the foam layer is preferably 80-160 ° C, and preferably increases gradually, so that the softening of the liquid binder and the foaming of the foam particles is more uniform. Through the foam layer, the heat is transported between different phases and media, whereby the heat conduction coefficient is reduced, so that a thermal insulation is achieved. The foam layer can biodegrade and thus be broken down into non-polluted water and carbon dioxide so that environmental protection is achieved.

Since the inner water-proofing layer and the outer foam layer are both biodegradable, the invention is an environmentally friendly container. In addition, the water-proofing layer and the foam layer are easy to machine and can be changed as needed. Further, the water-proofing layer and the foam layer are not made of food, have low manufacturing costs and have a heat-insulating effect. In addition, the water-proofing layer and the foam layer are formed on a same container. This is not known yet.

The invention can also be applied to other containers such as a paper cup, a paper plate, a paper box or the like, which simultaneously have an above-mentioned water-proofing layer and foam layer.

LIST OF REFERENCE NUMBERS

10

container

11

inner surface

12

outer surface

13

wall

14

ground

20

Waterproof layer

30

foam layer

Claims (9)

Thermally insulating and naturally degradable container, comprising a paper container ( 10 ), which has an inner surface ( 11 ), which is in contact with the food or drink, and an outer surface ( 12 ), a water protection layer ( 20 ), which act as a film on the inner surface of the paper container ( 10 ) and is formed by a mixture of hydrous magnesium silicate, resin and calcium carbonate, and a foam layer ( 30 ), which only on at least a part of the outer surface of the wall ( 13 ) and is made of a liquid binder and heat-resistant foam particles, wherein a mixture of liquid binder and heat-resistant foam particles is applied to the outer surface of the container, wherein the heat-resistant foam particles are foamed by heat and form the foam layer, wherein the liquid binder by Polyvinyl acetate resin, ethylene-vinyl acetate resin, polypropylene resin or mixture thereof, and wherein the heat-resistant foam particles are formed by a thermoplastic polymer comprising a low boiling point solvent. Heat-insulating and naturally degradable container according to claim 1, characterized in that in the water-proofing layer ( 20 ), the hydrous magnesium silicate has a content of 15-40% by weight, the resin has a content of 2-10% by weight and the calcium carbonate has a proportion of 50-83% by weight. Heat-insulating and naturally degradable container according to claim 1, characterized in that the paper container ( 10 ) a wall ( 13 ) and a floor ( 14 ), which form a receiving space, wherein the foam layer ( 30 ) on at least part of the outer surface of the wall ( 13 ) is formed. Heat-insulating and naturally degradable container according to claim 1, characterized in that the water-proofing layer ( 20 ) also comprises IR particles or nanosilver particles. Heat-insulating and naturally degradable container according to claim 1, characterized in that the water-proofing layer ( 20 ) also comprises polymer of alkenes. Heat-insulating and naturally degradable container according to claim 5, characterized in that in the water-proofing layer ( 20 ), the hydrous magnesium silicate is 15-40% by weight, the resin is 2-10% by weight, the calcium carbonate is 50-83% by weight, and the polymer is alkenes 10-70% Wt .-% has Heat-insulating and naturally degradable container according to claim 5, characterized in that the paper container ( 10 ) a wall ( 13 ) and a floor ( 14 ), which form a receiving space, wherein the foam layer ( 30 ) on at least part of the outer surface of the wall ( 13 ) is formed. Heat-insulating and naturally biodegradable container according to claim 5, characterized in that the polymer of alkenes polyethylene, polypropylene, polystyrene or their mixture may be. Heat-insulating and naturally degradable container according to claim 5, characterized in that the water-proofing layer ( 20 ) also comprises IR particles or nanosilver particles.

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