CN105857817A - Heat-insulating container - Google Patents

Abstract

An insulated container comprises a bottom wall and a surrounding wall which is jointed with the bottom wall and defines a containing space together. The surrounding wall comprises a paper layer, an inner lamination layer which is coated on the inner side of the paper layer and can be expanded by heating foaming, an outer lamination layer which is coated on the outer side of the paper layer, and an ink layer which is coated on the outer lamination layer. The inner lamination layer is composed of a first component, and the first component comprises low-density polyethylene. The outer laminated film layer is composed of a second component, and the second component comprises high-density polyethylene. The inner film layer directly surrounds the containing space, so that heat energy of liquid contained in the containing space can be directly insulated, the chance of heat energy dissipation is reduced, and the heat insulation effect and the heat preservation effect are improved.

Description

insulated container

technical field

The invention relates to a container, in particular to a paper container with heat insulation effect.

Background technique

Since paper containers are more environmentally friendly than Expandable Polystyrene (EPS) tableware, they have become the most commonly used food packaging containers in the catering industry, fast food industry, and food processing industry. In order to attract customers' attention and stimulate their willingness to purchase, manufacturers usually print various patterns on the outer surface of paper containers, such as food or ingredients patterns or advertising texts.

In addition, a general paper container is usually covered with a film layer on the inner surface of the paper layer, so as to make the paper container waterproof, but its heat insulation and heat preservation effect is poor. In order to improve the aforementioned problems, some companies provide a paper container with heat insulation effect. The outer surface of the paper layer is usually provided with a layer of foamable foam film layer, and the foam film layer is heated at a high temperature to make the foam film layer foam structure. Through the heat insulation effect of the foam film layer, the problem of the paper container being hot is avoided, and the heat preservation effect is improved.

However, since the foamed film layer is arranged on the outermost layer of the entire paper container, heat energy will only be insulated by the foamed film layer after passing through the film layer and the paper layer, so the aforementioned paper container is insulated. Still not ideal with insulation effect.

In addition, since the outer surface of the cup usually has a foam structure, some problems are faced when printing various patterns on the outer surface of the paper container. Specifically, when coating general ink on this foaming film layer to form the ink layer with pattern, because general ink can suppress foaming and expansion, make in the process of heating this foaming film layer at too high temperature, this hair The overall degree of foaming and expansion of the foam film layer is uneven, resulting in the rupture of the ink layer covering the foam film layer, thereby reducing the aesthetic feeling of the appearance. And because the degree of foaming is uneven, the heat insulation effect of the foamed film layer is reduced.

For this reason, industry usually can use the synchronous ink of higher price to coat on this foam film layer, in the process of heating this foam film layer at high temperature, this synchronous ink can expand while this foam film layer foams, Then it expands outwards synchronously, thus forming a patterned ink layer. In order to have a smooth appearance, it is necessary to print multiple simultaneous inks in the manufacture, which is not only difficult in construction, but also complicated in the process, thereby increasing the manufacturing cost.

Contents of the invention

The object of the present invention is to provide a thermally insulated container excellent in thermal insulation and thermal insulation effects.

The thermally insulated container of the present invention comprises a bottom wall and a surrounding wall joined with the bottom wall and jointly defining a containing space. The surrounding wall includes a paper layer, the paper layer has an inner side facing the containing space, and an outer side opposite to the inner side. The surrounding wall also includes an inner film layer that is coated on the inner side of the paper layer and can be heated and expanded, an outer film layer that is coated on the outer side of the paper layer, and an outer film layer that is coated on the outer layer layer of ink on top of the layer. The inner coating layer is composed of a first component, the first component contains low-density polyethylene; the outer coating layer is composed of a second component, and the second component contains high-density polyethylene vinyl.

In the heat-insulated container of the present invention, the second component further includes low-density polyethylene.

In the heat-insulated container of the present invention, the content of high-density polyethylene in the second component is not less than that of low-density polyethylene.

In the heat-insulated container of the present invention, the content of the high-density polyethylene in the second component is 50wt% to 70wt%.

According to the heat insulation container of the present invention, the bottom wall includes a paper layer, an inner film layer, and an outer film layer; the paper layer of the bottom wall has an inner side facing the containing space, and an opposite side The outer surface of the inner surface; the inner membrane layer is coated on the inner surface of the paper layer and can be heated and expanded; the outer membrane layer of the bottom wall is coated on the outer surface of the paper layer of the bottom wall.

The beneficial effects of the present invention are: the inner coating layer with foaming effect is arranged on the inner surface of the surrounding wall, and the inner coating layer directly surrounds the containing space, so that the content of the containing space can be directly insulated The heat energy of the contained liquid reduces the chance of heat energy dissipation, thereby improving the heat insulation effect to avoid the problem of the heat insulation container being hot, and improving the heat preservation effect.

Description of drawings

Fig. 1 is a perspective view of an embodiment of the heat-insulated container of the present invention;

Fig. 2 is a partial side sectional view of the present embodiment, mainly showing the structure of a bottom wall and a surrounding wall of the heat-insulated container;

Fig. 3 is a partial side sectional view of the present embodiment, mainly showing the layered structure of the surrounding wall;

FIG. 4 is a partial top sectional view of the present embodiment, mainly showing the junction of two sides of the surrounding wall.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that in the following description, similar elements are denoted by the same numerals.

Referring to Figures 1, 2, 3, and 4, an embodiment of the heat-insulated container of the present invention can be used to hold food materials. In this embodiment and related drawings, the appearance of the food material is described by taking the barrel shape as an example.

The heat-insulated container of this embodiment includes a bottom wall 1 and a surrounding wall 2 joined with the bottom wall 1 and jointly defining a containing space 3 .

In terms of shape and structure, the bottom wall 1 includes a plate-shaped bottom 101 located at the bottom of the receiving space 3 , and a ring-shaped joint portion 102 protruding downward from the periphery of the bottom 101 . The surrounding wall 2 includes a surrounding portion 201 surrounding the accommodating space 3 , and a ring-shaped folding portion 202 that is turned inwards and upwards from the bottom edge of the surrounding portion 201 .

Since the shape and structure of the heat-insulating container are known designs and there are many types, the structure of the heat-insulating container is not limited to the above-mentioned assembling method in practice.

In terms of layer composition, the bottom wall 1 includes: a paper layer 11 , an inner film layer 12 , and an outer film layer 13 . The paper layer 11 has an inner side 111 facing the containing space 3 , and an outer side 112 opposite to the inner side 111 . The inner film layer 12 is covered on the inner surface 111 of the paper layer 11 and can be heated and expanded. The outer film layer 13 is covered on the outer surface 112 of the paper layer 11 .

The surrounding wall 2 includes: a paper layer 21 , an inner film layer 22 , an outer film layer 23 , and an ink layer 24 . The paper layer 21 has an inner side 211 facing the containing space 3 , and an outer side 212 opposite to the inner side 211 . The inner coating layer 22 is coated on the inner side 211 of the paper layer 21 and can be heated and expanded, the outer coating layer 23 is coated on the outer side 212 of the paper layer 21, and the ink layer 24 is coated on the outer side. On the coating layer 23.

In terms of material selection, the materials of the inner coating layers 12 and 22 are the same, and both are composed of the first component, and the first component includes low density polyethylene (LDPE for short).

The materials of the outer coating layers 13 and 23 are the same, and both are composed of the second component, and the material of the second component can adopt the following two forms.

One of the aspects is that the second component only contains high-density polyethylene (High Density Polyethylene, referred to as HDPE), and the other aspect is that when the second component contains both high-density polyethylene and low-density polyethylene, That is, the outer coating layers 13 and 23 are made by kneading high-density polyethylene and low-density polyethylene.

In the present invention, the second component of the outer coating layer 13, 23 must contain high-density polyethylene, that is, the content of the second component of the outer coating layer 13, 23 high-density polyethylene cannot is 0 wt%. This is because the high-density polyethylene in the second component of the outer film layer 13,23 has the effect of blocking moisture, and because the material of the first component of the inner film layer 12,22 is low density Polyethylene, so in the process of heating to make the inner film layer 12, 22 foam and expand, the moisture in the paper layer 11, 21 will go to the inner film layer mainly made of low-density polyethylene material. 12, 22 direction flow, so that the inner film layer 12, 22 can be foamed.

In addition, as long as the second component of the outer coating layer 13, 23 contains high-density polyethylene, the outer coating layer 13, 23 will not expand, so the ink layer 24 can be selected from general ink. The general ink is made of water-based ink, specifically the model PF-G-110IN produced by Great World Ink & Coatings Co., Ltd., but not limited to the aforementioned examples.

Further, the content of high-density polyethylene in the second component of the outer coating layer 13, 23 is not less than that of low-density polyethylene. Preferably, the content of high density polyethylene in the second component is 50wt% to 70wt%, and the content of low density polyethylene in the second component is 30wt% to 50wt%. The numerical meanings of the upper and lower limits of the aforementioned content will be described later.

In manufacturing, when the bottom wall 1 and the surrounding wall 2 are bonded together to make the paper container, the surrounding wall 2 is first surrounded into a tube shape, so that the outer coating layer 23 on one end side of the surrounding wall 2 and the ink layer 24 is attached to the inner film layer 22 on the other end side of the surrounding wall 2, just as shown in FIG.

Next, as shown in FIG. 2 , the bottom 101 of the bottom wall 1 is positioned downward against the top edge of the folded portion 202 of the surrounding wall 2 , and the joint portion 102 of the bottom wall 1 is located at the top edge of the surrounding wall 2 . The surrounding part 201 and the folded part 202 are interposed between the opposite sides, and then heated by hot melt, so that the inner film layer 22 at the bottom of the surrounding part 201 and the folded part 202 is respectively bonded to the inner film layer of the joint part 102 12 and outer layer 13.

In use, the present invention arranges the inner surface 12 and 22 with foaming effect on the inner surface 111 of the bottom wall 1 and the inner surface 211 of the surrounding wall 2 respectively, through which the inner surface layer 12 , 22 directly surround the containing space 3, thereby directly insulating the heat energy of the liquid contained in the containing space 3, reducing the chance of heat energy loss, thereby improving the heat insulation effect to avoid the hot problem of the heat insulating container, and improving Insulation effect.

Further, when the second component of the outer coating layer 13, 23 comprises high-density polyethylene, the outer coating layer 13, 23 will not expand, so the ink layer 24 can be made of ordinary ink. Since the general ink is cheaper, the cost of materials can be reduced, and at the same time, because the construction of coating the general ink is simpler, the process can be simplified and the manufacturing cost can be reduced.

And when the second component of the outer coating layer 13, 23 contains both high-density polyethylene and low-density polyethylene, the outer coating layer 13 is made of high-density polyethylene and low-density polyethylene kneading material. The design of , 23 can reduce the melting point of the outer coating layer 13, 23, and can reduce the mutual adhesion of the superimposed outer coating layer 23 and the inner coating layer 22 during the process of surrounding the surrounding wall 2 into a tubular shape. and the heating temperature when the inner film layer 22 of the folded portion 202 and the outer film layer 13 of the joint portion 102 are bonded together, so energy can be saved and manufacturing cost can be reduced.

Therefore, the content of high-density polyethylene in the second component of the outer coating layer 13, 23 is not less than the content of low-density polyethylene, thereby reducing the melting point of the outer coating layer 13, 23 and maintaining the effect of blocking moisture . Preferably, the content of high density polyethylene in the second component is 50wt% to 70wt%, and the content of low density polyethylene in the second component is 30wt% to 50wt%.

The efficacy of the present invention will be described below through experimental examples and comparative examples, wherein each experimental example and each comparative example are made to the size of a 700cc capacity hand cup on the market.

In the test of the heat preservation effect, put 220 grams of ice cubes and 300 cc of water at 25°C into each experimental example and each comparative example, and then start timing, and then observe it statically until the ice cubes are completely dissolved and record the required time. The longer it takes for the ice to dissolve completely, the better the insulation of the container.

The degree of foaming is to first measure the thickness difference of the inner coating layer 12, 22 of Experimental Example 1, 2, 3, 4 and Comparative Example 2 before foaming and after foaming, and measure the thickness of Comparative Example 1. The thickness difference of the outer coating layer 13, 23 before foaming and after foaming, and compare the expansion ratio of the thickness after foaming with respect to the thickness before foaming, wherein the higher the expansion ratio, the better the degree of foaming .

Table 1

Referring to Table 1, it can be seen from Comparative Example 1 that because the material of the inner film layer is high-density polyethylene, it will not foam, and the material of the outer film layer is low-density polyethylene, so it will foam. However, because the foamable outer film layer is arranged on the outermost layer of the entire paper container, when heat energy passes through the inner film layer and the paper layer, it will be subjected to the foamable film layer. The insulation of the outer coating layer, so the heat insulation and heat preservation effect of Comparative Example 1 is really not ideal.

On the other hand, as can be seen from Experimental Examples 1, 2, 3, and 4, since the material of the inner coating layer 12, 22 is low-density polyethylene and foamed, the accommodating space 3 is directly surrounded by the inner coating layer 22 , so as to directly insulate the thermal energy of the liquid contained in the accommodating space 3, reduce the chance of thermal energy loss, thereby improving the thermal insulation effect to avoid the problem of the thermal insulation container being hot, and improve the thermal insulation effect. Therefore, the thermal insulation effects of Experimental Examples 1, 2, 3, and 4 are indeed better than those of Comparative Example 1.

Again in experimental example 2,3,4, because the second component of described outer film layer 13,23 comprises high density polyethylene and low density polyethylene simultaneously, can reduce described outer film layer 13,23 The melting point can further reduce the heating temperature of the outer coating layer 13, 23, so energy can be saved and manufacturing cost can be reduced. Therefore, the content of the high-density polyethylene in the second component of the outer coating layer 13 , 23 is preferably 50wt% to 70wt%.

It should be noted that, in the present invention, the second component of the outer coating layer 13, 23 must contain high-density polyethylene, that is, the high density of the second component of the outer coating layer 13, 23 The content of polyethylene cannot be 0 wt%. This is because the high-density polyethylene in the second component of the outer film layer 13,23 has the effect of blocking moisture, and because the material of the first component of the inner film layer 12,22 is low density Polyethylene, so in the process of heating to make the inner film layer 12, 22 foam and expand, the moisture in the paper layer 11, 21 will go to the inner film layer mainly made of low-density polyethylene material. 12, 22 direction flow, so that the inner film layer 12, 22 can be foamed.

Referring to Table 1 again, it can be seen from Comparative Example 2 that once the content of the high-density polyethylene of the second component of the outer coating layer is 0 wt%, the second component of the outer coating layer and the inner The material of the first component of the coating layer is low-density polyethylene, and because the second component of the outer coating layer does not contain high-density polyethylene, it loses the effect of blocking moisture, and then heats the inner During the foaming and expansion process of the coating layer, the moisture in the paper layer will flow to the outer coating layer and the inner coating layer at the same time, thereby reducing the foaming of the inner coating layer and further reducing the Describe the heat insulation and heat preservation effect of the inner coating layer. Also therefore, the degree of foaming (expansion multiple) of the inner film layer of Comparative Example 2 is obviously lower than that of the inner film layers 12, 22 of Experimental Examples 1, 2, 3, and 4.

In addition, the foaming degree of the outer film layer 13, 23 of Experimental Example 1 is the highest, and this is because in Experimental Example 1, the second component of the outer film layer 13, 23 only includes high-density polyethylene, That is to say, the content of the second component of the outer coating layer 13, 23 is 100wt% high-density polyethylene, which can effectively block the outward loss of moisture, so that the moisture in the paper layer 11, 21 is concentrated toward Internal flow, that is to make the water flow inward concentratedly towards the inner coating layer 12, 22 mainly made of low-density polyethylene material, so that the inner coating layer 12, 22 foams inward. Therefore, moisture can be locked in the outermost layer of the outer coating layer 13, 23 to prevent moisture from evaporating outward, thereby increasing the foaming degree of the inner coating layer 12, 22.

In contrast, the content of high-density polyethylene in the inner coating layers 12, 22 of Comparative Example 1 is 100 wt%, which can effectively block the inward loss of moisture, and make the moisture in the paper layers 11, 21 flow outward concentratedly. , that is to make the moisture flow outward concentratedly toward the outer coating layer 13 , 23 mainly made of low-density polyethylene material, so that the outer coating layer 13 , 23 is foamed outward. However, the design of the aforementioned outward foaming, coupled with the inner coating layer 12, 22 mainly made of high-density polyethylene material, is arranged in the innermost layer and cannot lock the moisture to avoid moisture from evaporating outwards. Therefore, the comparison example The degree of foaming of the outer coating layers 13 and 23 in Experimental Example 1 is lower than that in Experimental Example 1.

To sum up, in the present invention, the inner coating layers 12 and 22 having a foaming effect are respectively arranged on the inner side 111 of the bottom wall 1 and the inner side 211 of the surrounding wall 2, and the inner coating layer 22 is passed through the inner coating layer. 12, 22 directly surround the containing space 3, so as to directly insulate the heat energy of the liquid contained in the containing space 3, reduce the chance of heat energy loss, thereby improving the heat insulation effect and avoiding the hot problem of the heat insulating container, and Improve thermal insulation effect, so really can reach the purpose of the present invention.

Claims (5)

1. a heat-insulated container, comprises a diapire, and one engages with this diapire And jointly defining a leg containing space, this leg includes a ply of paper, this ply of paper There is a medial surface containing space towards this, and outside one in contrast to this medial surface Side；It is characterized in that: this leg also includes a medial surface being coated on this ply of paper can The heated interior leaching membrane layer of foaming and intumescing, the outer film of a lateral surface being coated on this ply of paper Layer, and a layer of ink being coated on this outer leaching membrane layer；This interior leaching membrane layer is by first group Part is constituted, and described first component comprises low density polyethylene (LDPE)；This outer leaching membrane layer is by second Component is constituted, and described second component comprises high density polyethylene (HDPE).

Heat-insulated container the most according to claim 1, it is characterised in that: described second group Part also comprises low density polyethylene (LDPE).

Heat-insulated container the most according to claim 2, it is characterised in that: described second group The content of the high density polyethylene (HDPE) of part is not less than the content of low density polyethylene (LDPE).

Heat-insulated container the most according to claim 2, it is characterised in that: described second group The content of the high density polyethylene (HDPE) of part is 50wt% to 70wt%.

Heat-insulated container the most according to claim 2, it is characterised in that: this diapire includes One ply of paper, an interior leaching membrane layer, and an outer leaching membrane layer；The ply of paper of this diapire has One medial surface containing space towards this, and a lateral surface in contrast to this medial surface； This interior leaching membrane layer is coated on the medial surface of this ply of paper and can be heated foaming and intumescing；This diapire Outer leaching membrane layer is coated on the lateral surface of the ply of paper of this diapire.