Double-layered foamed paper container and method of making the same

Abstract

A double-layered foamed paper container and a method for manufacturing the same. The method for manufacturing the double-layered foamed paper container comprises the following steps: coating a first foamed material (21), primary drying, coating a second foamed material (22), secondary drying, and heating and foaming. The double-layered foamed paper container manufactured by the method comprises a paper container body (10) having a ring wall (11) surrounding a containing space (12), and a first foamed layer (21a) arranged on at least a part of the surface of the ring wall (11) facing away from the containing space (12).

Description

Technical Field

[0001] This application relates to a foamed paper container and its manufacturing method. Background Technology

[0002] Paper containers used for holding hot drinks are typically insulated with a certain thickness of foam material on the outer wall to facilitate handling. The quality of the foaming affects the insulation effect. For example, a looser and thicker foam material can achieve better insulation, but foam material with larger pores is not conducive to printing, or printing can easily damage the structure of the foam layer, thus affecting the insulation effect and production yield.

[0003] In addition, cold drinks are usually served in ordinary paper containers, which are inconvenient for users to hold for a long time. The drinks also tend to defrost easily, and water droplets can easily condense on the outer wall of the paper container, which can even cause the paper container to soften and break. This situation needs to be improved.

[0004] On the other hand, in order to achieve the required heat insulation effect, the coating thickness of the foam material is relatively thick when it is applied in a single application, and the drying time is extremely long. If it is not completely dried (the outer layer is dry but the inner layer is not completely dry), there may be a problem of sticking when paper containers are stacked. If the drying speed is accelerated, the temperature needs to be increased. However, high temperature may cause the paper to deform.

[0005] Therefore, it is necessary to improve the paper containers that have good heat insulation, are easy to print on, and are not easily soaked by water droplets.

[0006] Application content

[0007] The main purpose of this application is to provide a double-layer foamed paper container and its manufacturing method, which is easy to process and can provide a foamed layer that has both heat insulation and waterproof effects and is easy to print, and can also meet different uses for hot and cold drinks.

[0008] To achieve the above objectives, this application provides a method for manufacturing a double-layer foamed paper container, comprising the following steps: coating a first foaming material: coating a first foaming material onto at least a portion of a paper container body; primary drying: drying the first foaming material at a temperature lower than the foaming temperature of the first foaming material; coating a second foaming material: coating a second foaming material onto at least a portion of the side of the first foaming material facing away from the paper container body; secondary drying: drying the second foaming material at a temperature lower than the foaming temperature of the second foaming material; and heating and foaming: heating the paper container body to cause the first foaming material and the second foaming material to foam and expand into a first foaming layer and a second foaming layer, respectively.

[0009] Optionally, before the heating and foaming step, a joining step is included: bending and connecting the paper container body to form an accommodating space.

[0010] Optionally, in the step of coating the second foaming material, the coating thickness of the second foaming material is different from the coating thickness of the first foaming material.

[0011] Optionally, in the step of coating the second foaming material, the coating thickness of the second foaming material is greater than the coating thickness of the first foaming material.

[0012] Optionally, in the step of coating the second foaming material, the coating thickness of the second foaming material is less than the coating thickness of the first foaming material.

[0013] Optionally, the first foaming material is the same as the second foaming material.

[0014] Optionally, it includes: the paper container body having a ring wall enclosing an accommodating space, the first foam layer being disposed in at least a portion of the side of the ring wall facing away from the accommodating space.

[0015] Optionally, 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.

[0016] Optionally, the first foam layer has a first thickness, the second foam layer has a second thickness, and the first thickness is less than the second thickness.

[0017] Optionally, the second foam layer has a printed layer on the side facing away from the first foam layer.

[0018] To achieve the above objectives, this application also provides a double-layer foamed paper container manufactured using the method described above, comprising: a paper container body having an annular wall enclosing an accommodating space, wherein the first foamed layer is disposed in at least a portion of the side of the annular wall facing away from the accommodating space. Attached Figure Description

[0019] Figure 1 This is a perspective view of a preferred embodiment of this application.

[0020] Figure 2 This is a cross-sectional view of a preferred embodiment of this application before foaming.

[0021] Figure 3 This is a cross-sectional view of a preferred embodiment of this application.

[0022] Figure 4 This is a flowchart illustrating a preferred embodiment of the present application.

[0023] Figure 5 This is a cross-sectional view of another preferred embodiment of this application.

[0024] Figure 6 This is a flowchart of a preferred embodiment of the present application.

[0025] Symbol explanation:

[0026] 10: Paper container body; 11: Circumferential wall; 12: Reception space; 21: First foaming material; 22: Second foaming material;

[0027] 21a, 21b: First foaming layer; 22a, 22b: Second foaming layer; S1~S6: Steps. Detailed Implementation

[0028] The following examples illustrate possible implementations of this application, but are not intended to limit the scope of protection sought by this application.

[0029] Please refer to Figures 1 to 4 , Figure 6 This application provides a double-layer foamed paper container, comprising a paper container body 10, a first foamed layer 21a and a second foamed layer 22a.

[0030] The paper container body 10 has an annular wall 11 that encloses a receiving space 12; the first foam layer 21a is disposed in at least a portion of the side of the annular wall 11 facing away from the receiving space 12 and has a first thickness; the second foam layer 22a is disposed in at least a portion of the side of the first foam layer 21a facing away from the paper container body 10 and has a second thickness, the first thickness and the second thickness being different. The first thickness and the second thickness can be changed according to usage requirements, thereby being suitable for holding hot or cold drinks, achieving the desired effects such as heat insulation, heat preservation, and waterproofing.

[0031] Reference Figure 3 In this embodiment, the first thickness is greater than the second thickness, thereby the first foamed layer 21a has excellent heat insulation effect on the hot beverage in the paper container body 10, effectively keeping it warm and preventing burns. Furthermore, the second foamed layer 22a can have a finer, smoother surface, and a printing layer can be provided on the side of the second foamed layer 22a facing away from the first foamed layer 21a, resulting in excellent printing effects. In other embodiments, the first thickness can also be less than the second thickness, such as... Figure 5 As shown, the first foam layer 21b can be stably attached to the ring wall 11 to increase structural strength, and the second foam layer 22b can effectively block the room temperature and the temperature inside the paper container body 10, further improving the cold insulation effect.

[0032] This application also provides a method for manufacturing a double-layer foamed paper container, comprising the following steps:

[0033] Applying a first foaming material S1: Applying a first foaming material 21 to at least a portion of a ring wall 11 of a paper container body 10.

[0034] First drying S2: The first foam material 21 is dried at a temperature lower than the foaming temperature of the first foam material 21.

[0035] S3: Applying a second foaming material: A second foaming material 22 is applied to at least a portion of the side of the first foaming material 21 facing away from the paper container body 10, wherein the coating thickness of the second foaming material 22 is different from the coating thickness of the first foaming material 21. The coating thickness of the second foaming material 22 can be configured to be greater than or less than the coating thickness of the first foaming material 21 as needed, thereby producing a double-layered foamed paper container with different effects. For example, the coating thicknesses of the first foaming material 21 and the second foaming material 22 can be adjusted by changing the mesh size of a coating apparatus.

[0036] Secondary drying S4: The second foaming material 22 is dried 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 foaming material is dried and non-sticky, which facilitates subsequent processing. The drying speed is fast and the temperature does not need to be too high, thereby improving the production speed.

[0037] S5: The paper container body 10 is heated, causing the first foaming material 21 and the second foaming material 22 to foam and expand into a first foamed layer 21a and a second foamed layer 22a, respectively. Preferably, the first foaming material 21 and the second foaming material 22 are the same, and the foaming temperature is the same, making it easy to control the degree of foaming of the first foamed layer 21a and the second foamed layer 22a. Furthermore, the thickness of the first foamed layer 21a and the second foamed layer 22a can be changed by adjusting the coating thickness, facilitating processing. However, the first foaming material and the second foaming material can also be different, allowing for different degrees of foaming at different temperatures to provide foamed layers of different densities.

[0038] Preferably, before the heating and foaming step S5, a joining step S6 is included: bending and connecting the paper container body 10 to form an accommodating space 12. This makes the paper container body 10 smaller and easier to process during the manufacturing process, and avoids problems such as insufficient bonding strength and inconvenience caused by foaming first and then joining. After the heating and foaming step S5, a printing step is preferably included: printing a printing layer on the side of the second foaming layer 22a that faces away from the first foaming layer 21a. This avoids the problem of the ink in the printing layer separating due to the expansion of the second foaming material 22, which would occur if printing were done before foaming, resulting in a better printing effect.

[0039] In summary, the double-layer foamed paper container provided by this application, due to the different thicknesses of the two foamed layers, can meet the different needs of the inner and outer layers respectively, so as to provide a double-layer foamed paper container suitable for cold and hot drinks, which has the advantages of heat preservation (cold), prevention of water droplet condensation and wetting, and good printing effect. In addition, the foaming material is coated and dried in two stages, which can make each foaming layer extremely thin, making the drying speed faster and the temperature not needing to be too high. The foaming can be completed in one heating foaming step, which is convenient for production and can increase the production speed.

Claims

1. A method for manufacturing a double-layer foamed paper container, comprising the following steps: Applying a first foaming material: applying a first foaming material to at least a portion of a paper container body; First drying: Drying the first foaming material at a temperature lower than the foaming temperature of the first foaming material; Applying a second foaming material: Applying a second foaming material to at least a portion of the side of the first foaming material that faces away from the paper container body; Secondary drying: Drying the second foaming material at a temperature lower than the foaming temperature of the first foaming material, and the secondary drying temperature is also lower than the foaming temperature of the first foaming material; and Heating and foaming: The paper container body is heated so that the first foaming material and the second foaming material foam and expand into a first foaming layer and a second foaming layer, respectively.

2. The method for manufacturing a double-layer foamed paper container as described in claim 1, wherein before the heating and foaming step, a joining step is further included: bending and connecting the paper container body to form an accommodating space.

3. The method for manufacturing a double-layer foamed paper container as described in claim 1, wherein in the step of coating the second foaming material, the coating thickness of the second foaming material is different from the coating thickness of the first foaming material.

4. The method for manufacturing a double-layer foamed paper container as described in claim 3, wherein in the step of coating the second foaming material, the coating thickness of the second foaming material is greater than the coating thickness of the first foaming material.

5. The method for manufacturing a double-layer foamed paper container as described in claim 3, wherein in the step of coating the second foaming material, the coating thickness of the second foaming material is less than the coating thickness of the first foaming material.

6. The method for manufacturing a double-layer foamed paper container as described in claim 1, wherein the first foaming material is the same as the second foaming material.

7. A double-layer foamed paper container manufactured using the method described in any one of claims 1 to 6, comprising: The paper container body has a ring wall that encloses a receiving space, and the first foam layer is disposed in at least a portion of the side of the ring wall facing away from the receiving space.

8. The double-layer foamed paper container as claimed in claim 7, wherein the first foamed layer has a first thickness, the second foamed layer has a second thickness, and the first thickness is greater than the second thickness.

9. The double-layer foamed paper container as claimed in claim 7, wherein the first foamed layer has a first thickness, the second foamed layer has a second thickness, and the first thickness is less than the second thickness.

10. The double-layer foamed paper container as claimed in claim 7, wherein a printed layer is provided on the side of the second foamed layer facing away from the first foamed layer.

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