TWI880090B - Double-layer foam paper container and method to manufacture double-layer foam paper container - Google Patents

Abstract

A method to manufacture double-layer foam paper container includes steps of: coating a first foam material on a wall of the a paper container; coating a second foam material on an outer face of the first foam material wherein the blow points of the first foam material and the second foam material have 3 degrees difference; heating the paper container to make the first foam material and the second foam material foamed in different time to form a first foam layer and a second foam layer.

Description

Double-layer foam paper container structure and method for manufacturing double-layer foam paper container

The present invention relates to a foam paper container and a manufacturing method thereof.

It is known that paper containers for holding hot drinks are often provided with a foam material of a certain thickness on the outer wall of the paper container to achieve a heat insulation effect so that users can hold it. However, the foaming effect will affect the heat insulation effect. For example, a fluffier and thicker foam material can achieve a better heat insulation effect, but a less dense and fine foam material is not conducive to printing, or printing can easily destroy the foam layer structure, thereby affecting the heat insulation effect and yield.

In addition, cold drinks are usually served in ordinary paper containers, which can easily cause frostbite if held for a long time. Cold drinks can also easily heat up and no longer remain cool. In addition, water droplets can easily condense on the outer wall of the paper container, which can further soak the paper container, causing it to soften and become damaged. This needs to be improved.

On the other hand, when the foam material is applied once, in order to achieve the required insulation effect, the thickness of the coating is relatively thick, and the drying is extremely time-consuming. If the drying speed is to be accelerated, the temperature must be increased. However, high temperature may cause the paper to deform, and if it is not completely dried (the outer layer is dry but the inner layer is not completely dry), the paper containers may stick to each other when stacked.

Therefore, it is necessary to improve how to provide a paper container that has good heat preservation effect, is easy to print and is not easily soaked by water droplets.

The main purpose of the present invention is to provide a double-layer foam paper container structure and a method for manufacturing the double-layer foam paper container, which can provide a foam layer with heat insulation effect, waterproof effect and printing effect, and meet the different uses of hot and cold drinks.

To achieve the above object, the present invention provides a double-layer foamed paper container structure, comprising a paper container body, a first foamed layer and a second foamed layer.

The paper container body has a ring wall and encloses a accommodating space; the first foaming layer is arranged on at least a portion of the ring wall; the second foaming layer is arranged on at least a portion of the side of the first foaming layer facing away from the paper container body; wherein, after a first foaming material is coated on at least a portion of the ring wall of the paper container body, a second foaming material is further coated on at least a portion of the first foaming material, the foaming temperature of the first foaming material is at least 3 degrees lower than the foaming temperature of the second foaming material, and the first foaming material and the second foaming material are heated and foamed to form the first foaming layer and the second foaming layer respectively.

To achieve the above-mentioned object, the present invention further provides a double-layer foamed paper container structure, comprising a paper container body, a first foamed layer and a second foamed layer.

The paper container body has a ring wall and encloses a accommodating space; the first foaming layer is arranged on at least a portion of the ring wall; the second foaming layer is arranged on at least a portion of the side of the first foaming layer facing away from the paper container body; wherein, after a first foaming material is coated on at least a portion of the ring wall of the paper container body, a second foaming material is further coated on at least a portion of the first foaming material, the foaming temperature of the first foaming material is at least 3 degrees higher than the foaming temperature of the second foaming material, and the first foaming material and the second foaming material are heated and foamed to form the first foaming layer and the second foaming layer respectively.

To achieve the above object, the present invention further provides a method for making a double-layer foam paper container, comprising the following steps:

Applying a first foaming material: applying a first foaming material on at least a portion of a peripheral wall of a paper container body; applying a second foaming material: applying a second foaming material on at least a portion of a surface of the first foaming material facing away from the paper container body, wherein the foaming temperature of the first foaming material is at least 3 degrees lower than the foaming temperature of the second foaming material; heating and foaming: heating the paper container body so that the first foaming material first foams and expands to form a first foaming layer, and then the second foaming material foams and expands to form a second foaming layer.

To achieve the above object, the present invention further provides a method for making a double-layer foam paper container, comprising the following steps:

Applying a first foaming material: applying a first foaming material on at least a portion of a peripheral wall of a paper container body; applying a second foaming material: applying a second foaming material on at least a portion of a surface of the first foaming material facing away from the paper container body, wherein the foaming temperature of the first foaming material is at least 3 degrees higher than the foaming temperature of the second foaming material; heating and foaming: heating the paper container body so that the second foaming material first foams and expands to form a second foaming layer, and then the first foaming material foams and expands to form a first foaming layer.

The following examples are merely used to illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention, so it should be noted in advance.

1 to 4 , the present invention provides a double-layer foam paper container structure, including a paper container body 10 , a first foam layer 21 a and a second foam layer 22 a .

The paper container body 10 has a ring wall 11 to enclose a accommodating space; the first foaming layer 21a is arranged on at least a portion of the ring wall 11; the second foaming layer 22a is arranged on at least a portion of the first foaming layer 21a facing away from the paper container body 10; wherein, after a first foaming material 21 is coated on at least a portion of the ring wall 11 of the paper container body 10, a second foaming material 22 is further coated on at least a portion of the first foaming material 21, the foaming temperature of the first foaming material 21 is at least 3 degrees lower than the foaming temperature of the second foaming material 22, and the first foaming material 21 and the second foaming material 22 are heated and foamed to form the first foaming layer 21a and the second foaming layer 22a respectively. Preferably, a printing layer is printed on a side of the second foaming layer facing away from the first foaming layer.

The present invention also provides a method for making a double-layer foam paper container, comprising the following steps:

Applying a first foaming material: Applying a first foaming material 21 on at least a portion of a peripheral wall 11 of a paper container body 10 .

Applying the second foaming material: Applying a second foaming material 22 on at least a portion of the surface of the first foaming material 21 facing away from the paper container body 10 , wherein the foaming temperature of the first foaming material 21 is at least 3 degrees lower than the foaming temperature of the second foaming material 22 .

Heating and foaming: The paper container body 10 is heated to make the first foaming material 21 foam and expand to form a first foaming layer 21a, and then the second foaming material 22 foams and expands to form a second foaming layer 22a. Preferably, a printing layer is printed on the side of the second foaming layer facing away from the first foaming layer.

Thereby, the first foaming layer foams and expands earlier and faster, and can expand to be thicker and fluffier, which has an excellent heat-insulating effect on the hot drinks in the paper container body, while the second foaming layer foams and expands more slowly, and its thickness is thinner but the texture is fine and dense, which is very suitable for further printing a printed layer thereon, and is also suitable for directly forming a printed foaming layer with pigment particles. Therefore, in this embodiment, a paper container with good heat-insulating effect and printing effect can be provided, which is particularly suitable for holding hot drinks.

In another embodiment of the present invention, as shown in FIGS. 2 , 5 and 6 , the present invention provides a double-layer foamed paper container structure, comprising a paper container body 10 , a first foamed layer 21 b and a second foamed layer 22 b .

The paper container body 10 has a ring wall 11 to enclose a accommodating space; the first foaming layer 21b is arranged on at least a portion of the ring wall 11; the second foaming layer 22b is arranged on at least a portion of the first foaming layer 21b facing away from the paper container body 10; wherein, after a first foaming material 21 is coated on at least a portion of the ring wall 11 of the paper container body 10, a second foaming material 22 is further coated on at least a portion of the first foaming material 21, the foaming temperature of the first foaming material 21 is at least 3 degrees higher than the foaming temperature of the second foaming material 22, and the first foaming material 21 and the second foaming material 22 are heated and foamed to form the first foaming layer 21b and the second foaming layer 22b respectively.

The present invention also provides a method for making a double-layer foam paper container, comprising the following steps:

Applying a first foaming material: Applying a first foaming material 21 on at least a portion of a peripheral wall 11 of a paper container body 10 .

Applying the second foaming material: Applying a second foaming material 22 on at least a portion of the surface of the first foaming material 21 facing away from the paper container body 10 , wherein the foaming temperature of the first foaming material 21 is at least 3 degrees higher than the foaming temperature of the second foaming material 22 .

Heating and foaming: The paper container body 10 is heated, so that the second foaming material 22 first foams and expands to form a second foaming layer 22b, and then the first foaming material 21 foams and expands to form a first foaming layer 21b.

Thus, the first foam layer expands slowly and has a smaller thickness but a fine and dense texture. When directly attached to the peripheral wall of the paper container, it can prevent water droplets on the outer wall from condensing and soaking the paper container when cold drinks are contained, causing the paper container structure to become soft, etc. In addition, the first foam layer has a large contact area with the paper and has strong adhesion and is not easy to fall off. The second foam layer is on the outside to isolate the room temperature and cold drinks, further improving the cold preservation effect.

In summary, the double-layer foam paper container provided by the present invention has different foaming results under the same foaming conditions due to the different foaming temperatures of the two foaming layers, and thus has different thicknesses and textures. Different requirements for the inner and outer layers can be met respectively, and cold and hot drinks can be contained in the most suitable paper container respectively, which has the advantages of heat preservation (cold), prevention of condensation and wetting of water droplets, and good printing effect. In addition, applying the foaming material twice can make the thickness of each foaming layer extremely thin, so that the drying speed is faster and the temperature does not need to be too high, which can increase the production speed.

10: Paper container body 11: Ring wall 21: First foaming material 22: Second foaming material 21a, 21b: First foaming layer 22a, 22b: Second foaming layer

Figure 1 is a three-dimensional diagram of the present invention. Figure 2 is a cross-sectional diagram of the present invention before foaming. Figure 3 is a cross-sectional diagram of the first embodiment of the present invention. Figure 4 is a schematic diagram of the foaming process of the first embodiment of the present invention. Figure 5 is a cross-sectional diagram of the second embodiment of the present invention. Figure 6 is a schematic diagram of the foaming process of the second embodiment of the present invention.

10: Paper container body 11: Ring wall 21a: First foaming layer 22a: Second foaming layer

Claims (6)

A double-layer foam paper container structure comprises: A paper container body having a ring wall and surrounding a containing space; A first foam layer, the first foam layer being arranged on at least a part of the ring wall; A second foam layer, the second foam layer being arranged on at least a part of the side of the first foam layer facing away from the paper container body; wherein, after a first foam material is coated on at least a part of the ring wall of the paper container body, a second foam material is further coated on at least a part of the first foam material, the foaming temperature of the first foam material is at least 3 degrees lower than the foaming temperature of the second foam material, and the first foam material and the second foam material are heated and foamed to form the first foam layer and the second foam layer respectively. The double-layer foam paper container structure as described in claim 1, wherein a printing layer is printed on the side of the second foam layer facing away from the first foam layer. A double-layer foam paper container structure comprises: A paper container body having a ring wall and surrounding a containing space; A first foam layer, the first foam layer being arranged on at least a part of the ring wall; A second foam layer, the second foam layer being arranged on at least a part of the side of the first foam layer facing away from the paper container body; wherein, after a first foam material is coated on at least a part of the ring wall of the paper container body, a second foam material is further coated on at least a part of the first foam material, the foaming temperature of the first foam material is at least 3 degrees higher than the foaming temperature of the second foam material, and the first foam material and the second foam material are heated and foamed to form the first foam layer and the second foam layer respectively. A method for making a double-layer foam paper container comprises the following steps: Applying a first foam material: applying a first foam material on at least a portion of a peripheral wall of a paper container body; Applying a second foam material: applying a second foam material on at least a portion of a surface of the first foam material facing away from the paper container body, wherein the foaming temperature of the first foam material is at least 3 degrees lower than the foaming temperature of the second foam material; Heating and foaming: heating the paper container body, so that the first foam material first foams and expands to form a first foam layer, and then the second foam material foams and expands to form a second foam layer. A method for making a double-layer foam paper container as described in claim 4, wherein a printing layer is printed on the side of the second foam layer facing away from the first foam layer. A method for making a double-layer foam paper container comprises the following steps: Applying a first foam material: applying a first foam material on at least a portion of a peripheral wall of a paper container body; Applying a second foam material: applying a second foam material on at least a portion of a surface of the first foam material facing away from the paper container body, wherein the foaming temperature of the first foam material is at least 3 degrees higher than the foaming temperature of the second foam material; Heating and foaming: heating the paper container body so that the second foam material first foams and expands to form a second foam layer, and then the first foam material foams and expands to form a first foam layer.

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