TWI830249B - Double-layer foam paper container and method for manufacturing the same - Google Patents

Abstract

A method for manufacturing a double-layer foam paper container is provided, including following steps of: applying first foam material, primary drying, applying first foam material, secondary drying and heat foaming. A double-layer foam paper container is further provided, using the method described above, including: a main body, having a circumferential wall and defining a receiving space, a first foam layer disposed on at least part of a side of the circumferential wall opposite to the receiving space.

Description

Double-layer foam paper container and its preparation method

The invention relates to a foam paper container and its preparation method.

It is known that paper containers used to hold hot drinks are often provided with a foam material with a certain thickness on the outer wall of the paper container to achieve a heat insulation effect so that the user can hold it. The result of foaming will affect the heat insulation effect, for example, it will be more fluffy. , Thicker foam materials can achieve better heat insulation effects, but foam materials with larger holes are not conducive to printing, or printing can easily damage the foam layer structure, thus affecting the heat insulation effect and production yield.

In addition, cold drinks are usually packed in ordinary paper containers, which is inconvenient for users to hold for a long time. Cold drinks are also easy to de-ice, and water droplets can easily condense on the outer wall of the paper container, which may even cause the paper container to soften and break. This needs improvement.

On the other hand, in order to achieve the required thermal insulation effect, the thickness of the coating when coating the foam material in a single time is relatively thick, and drying is extremely time-consuming. If it is not completely dried (the outer layer is dry but the inner layer is not yet completely dry), the paper There may be sticking problems when containers are stacked on top of each other; if you want to speed up drying, you need to increase the temperature. However, high temperatures may deform the paper.

Therefore, it is necessary to improve how to provide paper containers that have good thermal insulation effect, are easy to print and are not easily soaked by water droplets.

The main purpose of the present invention is to provide a double-layer foam paper container and a manufacturing method thereof, which are easy to process and can provide a foam layer that has both thermal insulation and waterproof effects and is easy to print. It can also be used for different purposes of hot and cold drinks.

In order to achieve the above object, the present invention provides a method for making a double-layer foamed paper container, which includes the following steps: coating a first foaming material: coating a first foaming material on at least part of a paper container body; drying once : Drying the first foaming material at a foaming temperature lower than that of the first foaming material; Coating the second foaming material: On at least part of the surface of the first foaming material facing away from the paper container body Coating a second foaming material; secondary drying: drying the second foaming material at a foaming temperature lower than the second foaming material; and heating foaming: heating the paper container body to make The first foam material and the second foam material are respectively foamed and expanded into a first foam layer and a second foam layer.

In order to achieve the above object, the present invention also provides a double-layer foamed paper container using the above-mentioned manufacturing method, including: the paper container body has an annular wall surrounding a containing space, and the first foaming layer is located on At least part of the side of the annular wall facing away from the accommodating space.

10: Paper container body

11: Ring wall

12: Accommodation space

21: First foam material

22: Second foam material

21a, 21b: first foam layer

22a, 22b: Second foam layer

S1~S6: steps

Figure 1 is a perspective view of a preferred embodiment of the present invention.

Figure 2 is a cross-sectional view of a preferred embodiment of the present invention before foaming.

Figure 3 is a cross-sectional view of a preferred embodiment of the present invention.

Figure 4 is a schematic flow chart of a preferred embodiment of the present invention.

Figure 5 is a cross-sectional view of another preferred embodiment of the present invention.

Figure 6 is a flow block diagram of a preferred embodiment of the present invention.

The following examples are only used to illustrate the possible implementation modes of the present invention, but are not intended to limit the scope of protection of the present invention.

Please refer to Figures 1 to 4 and 6. The present invention provides a double-layer foam paper container, which includes a paper container body 10, a first foam layer 21a and a second foam layer 22a.

The paper container body 10 has an annular wall 11 surrounding an accommodating space 12; the first foam layer 21a is disposed on at least part of the side of the annular wall 11 facing away from the accommodating space 12 and has a first thickness ; The second foam layer 22a is disposed on at least part of the side of the first foam layer 21a facing away from the paper container body 10 and has a second thickness, and the first thickness is different from the second thickness. The first thickness and the second thickness can be changed according to usage requirements, so that they are suitable for holding hot drinks or cold drinks to achieve desired effects such as heat insulation, heat preservation, and waterproofing.

With reference to Figure 3, in this embodiment, the first thickness is greater than the second thickness, whereby the first foam layer 21a has an excellent thermal insulation effect on the hot drink in the paper container body 10 and can effectively maintain heat. In order to avoid burning hands, the second foam layer 22a can have a finer and smooth surface, and a printing layer can be provided on the side of the second foam layer 22a facing away from the first foam layer 21a, so that the printing effect is good. In other embodiments, the first thickness may also be smaller than the second thickness, as shown in FIG. 5 , whereby the first foam layer 21b can be stably attached to the ring wall 11 to increase structural strength, and the third The second foam layer 22b can effectively isolate the room temperature from the temperature inside the paper container body 10, further improving the cold preservation effect.

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

Coating the first foaming material S1: Coating a first foaming material 21 on at least part of the circumferential wall 11 of the paper container body 10.

Primary drying S2: Dry the first foaming material 21 at a temperature lower than the foaming temperature of the first foaming material 21 .

Coating the second foaming material S3: Coating a second foaming material 22 on at least a partial area of the side of the first foaming material 21 facing away from the paper container body 10, wherein the coating of the second foaming material 22 thickness It is different from the coating thickness of the first foam material 21 . The coating thickness of the second foam material 22 can be configured to be greater or smaller than the coating thickness of the first foam material 21 as required, thereby producing the double-layer foam paper container with different effects. For example, the coating thickness of the first foam material 21 and the second foam material 22 can be adjusted by changing the mesh size of a coating device.

Secondary drying S4: Dry the second foaming material 22 at a temperature lower than the foaming temperature of the second foaming material 22 (preferably also lower than the foaming temperature of the first foaming material 21). Through the primary drying step S2 and the secondary drying step S4, the coated foam material is dry and non-sticky, which facilitates subsequent processing. The drying speed is fast and the temperature does not need to be too high, thereby increasing the production speed.

Heating and foaming S5: The paper container body 10 is heated to foam and expand the first foaming material 21 and the second foaming material 22 respectively into a first foaming layer 21a and a second foaming layer 22a. . The first foaming material 21 and the second foaming material 22 are preferably of the same material type and have the same foaming temperature so that it is easy to control the foaming degree of the first foaming layer 21a and the second foaming layer 22a. And the thickness of the first foam layer 21a and the second foam layer 22a can be changed by adjusting the coating thickness, which facilitates processing. However, the material types of the first foaming material and the second foaming material can also be different, and foaming can be performed to different degrees at different temperatures to provide foaming layers with different densities.

Preferably, before the heating and foaming step S5, there is also a joining step S6: folding and connecting the paper container body 10 to form an accommodation space 12, so that the paper container body 10 can be connected during the processing. It is small in size and easy to process. It can also avoid problems such as insufficient bonding force and inconvenient operation caused by foaming first and then connecting. After the heating foaming step S5, it is preferable to further include a printing step: printing a printing layer on the side of the second foaming layer 22a facing away from the first foaming layer 21a, thereby avoiding printing first and then printing. The second foaming material 22 expands and causes the color materials of the printing layer to separate from each other, resulting in better printing effect.

In summary, the double-layer foam paper container provided by the present invention can meet different needs for the inner and outer layers due to the different thicknesses of the two foam layers, thereby providing a double-layer foam paper suitable for cold and hot drinks. The container has the advantages of heat preservation (cold), prevention of water droplet condensation and soaking, and good printing effect; in addition, Coating and drying the foaming material in two steps can make the thickness of each foaming layer extremely thin, making the drying speed faster and the temperature not needing to be too high. Foaming can be completed in one heating and foaming step, which facilitates production. And can increase production speed.

10: Paper container body 11: Ring wall 12: Accommodation space 21a: First foaming layer 22a: Second foam layer

Claims (10)

A method for making a double-layer foamed paper container, including the following steps: coating a first foaming material: coating a first foaming material on at least part of a paper container body; drying once: drying at a temperature lower than the first foaming material Drying the first foaming material at the foaming temperature of the foaming material; coating the second foaming material: coating a second foaming material on at least part of the side of the first foaming material facing away from the paper container body ; Secondary drying: drying the second foaming material at a foaming temperature lower than that of the second foaming material; and heating foaming: heating the paper container body to make the first foaming material and the The second foaming material is foamed and expanded into a first foaming layer and a second foaming layer respectively. The method for manufacturing a double-layer foamed paper container as claimed in claim 1, which further includes a joining step before the heating and foaming step: folding and connecting the paper container body to form a storage space. The method for making a double-layer foam paper container as claimed in claim 1, wherein in the step of coating the second foam material, the coating thickness of the second foam material is different from the coating thickness of the first foam material. cloth thickness. The manufacturing method of a double-layer foam paper container as claimed in claim 3, wherein in the step of coating the second foam material, the coating thickness of the second foam material is greater than the coating thickness of the first foam material . The manufacturing method of a double-layer foam paper container as claimed in claim 3, wherein in the step of coating the second foam material, the coating thickness of the second foam material is smaller than the coating thickness of the first foam material. . The method of making a double-layer foam paper container as claimed in claim 1, wherein the first foam material and the second foam material are of the same type. A double-layer foam paper container using the manufacturing method as described in any one of claims 1 to 6, including: the paper container body has an annular wall surrounding a storage space, and the first foam layer is provided on the At least part of the side of the annular wall facing away from the accommodation space. The double-layer foam paper container as claimed in claim 7, wherein the first foam layer has a first thickness, the second foam layer has a second thickness, and the first thickness is greater than the second thickness. The double-layer foam paper container as claimed in claim 7, wherein the first foam layer has a first thickness, the second foam layer has a second thickness, and the first thickness is smaller than the second thickness. The double-layer foam paper container as claimed in claim 7, wherein a printing layer is provided on a side of the second foam layer facing away from the first foam layer.

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