CN117416610A - Packaging box and manufacturing method thereof - Google Patents

Abstract

The invention discloses a packaging box and a manufacturing method thereof, wherein the packaging box includes a packaging body and a filling structure. The packaging body has a surface, the surface of the packaging body forms a recessed area, and the recessed area has a bottom surface, and the packaging body includes the first foaming material. The filling structure is arranged in the recessed area and connected to the bottom surface, and the filling structure has side walls. The first foam material surrounds the side wall of the filling structure, and a groove is formed between the first foam material and the side wall of the filling structure. The filling structure includes a second foaming material, and the average sphericity of the particles of the first foaming material is closer to 1 than the average sphericity of the particles of the second foaming material.

Description

Packaging box and manufacturing method thereof

Technical field

The present invention relates to a packaging box and a manufacturing method thereof. Specifically, the present invention relates to a packaging box containing recycled foam material and a manufacturing method thereof.

Background technique

Styrofoam foam materials are one of the most widely used and most used materials among packaging materials due to their low price and good production and protection efficiency. However, in recent years, issues such as energy conservation, carbon reduction, reduction of earth energy extraction and resource conservation have received much attention. If the product is made of 100% new materials, the production cost of the product will increase.

Therefore, adding reuse design of recycled materials into packaging materials is one of the trends in green technology. However, after adding recycled materials, packaging materials often have a structural weakening problem, which may lead to a decrease in the support and protective power of objects to be protected. This is a technical problem that needs to be solved when using recycled materials. In addition, after new foam materials and recycled foam materials are directly mixed and molded, the differences in the composition of the particles and uneven stress of the two materials will cause poor bonding, causing the packaging box to warp, deform, or be poorly formed.

Contents of the invention

In order to solve the above technical problems, embodiments of the present invention provide a packaging box, which includes a packaging body and a filling structure. The packaging body has a surface, and a recessed area is formed on the surface. The recessed area has a bottom surface, and the packaging body contains the first foaming material. The filling structure is arranged in the recessed area and connected to the bottom surface, and has a side wall. The first foaming material surrounds the side wall, and a groove is formed between the first foaming material and the side wall. The filling structure includes a second foaming material, and the average sphericity of the particles of the first foaming material is closer to 1 than the average sphericity of the particles of the second foaming material.

Embodiments of the present invention also provide a method for manufacturing a packaging box, which includes injecting a first foaming material into a first region of a mold, and injecting a second foaming material into a second region of the mold. The first region surrounds the second region, and there is a partition between the first region and the second region, and the sphericity of the particles of the first foaming material is closer to 1 than the average sphericity of the particles of the second foaming material. and hot-pressing the first foam material and the second foam material to form a packaging box. The hot-pressing conditions of the first foam material and the second foam material are the same.

Compared with the prior art, embodiments of the present invention can add recycled foam materials into the packaging box without affecting the structural strength of the packaging box. Moreover, recycled foam materials can be integrated into the original manufacturing method of new foam material packaging boxes without increasing manufacturing costs. In addition, recycled foam materials can be crushed, melted and granulated for re-production without classification, minimizing waste and energy use.

Description of the drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the accompanying drawings are described as follows.

Figure 1 is a schematic perspective view of a packaging box according to an embodiment of the present invention;

Figure 2A is a schematic top view of the packaging box according to the embodiment of the present invention;

Figure 2B is a schematic cross-sectional view of the filling structure and trench according to the embodiment of the present invention;

Figure 3 is a schematic top view of the configuration of the filling structure on the first support surface according to the embodiment of the present invention;

Figure 4 is a schematic top view of the configuration of the filling structure on the second support surface according to the embodiment of the present invention;

Figure 5 is a schematic side view of the packaging box manufacturing equipment and mold according to the embodiment of the present invention;

Figure 6 is a schematic flow chart of a manufacturing method of a packaging box according to an embodiment of the present invention.

Symbol Description

10: Packing box

100: Packaging body

110: Side wall part

120: Bottom of box

130: Depression area

150: first support surface

150L: long side of rectangle

150W: Short side of rectangle

160: Second support surface

160L1, 160L2: Long side

160S1, 160S2: short side

160W1, 160W2: Width

160V1, 160V2, 160V3, 160V4: vertex

200: Filling structure

210: Side wall

300: First foaming material

400: Second foam material

500: Groove

500W: Groove width

500D: Groove depth

600: First edge area

701, 702, 703, 704: Second edge area

800: Manufacturing molds

801: First area

802: Second area

810: Partition

900: Flowchart

901, 902, 903: Steps

Detailed ways

Various embodiments will be described in this specification, and those skilled in the art can easily understand the spirit and principles of the present invention with reference to the accompanying drawings. Here, various elements or portions illustrated in each drawing may be exaggerated or changed for the sake of clarity. Therefore, it should be understood by those of ordinary skill in the art that the dimensions and relative proportions of various elements or portions illustrated in the drawings are not the true dimensions and relative proportions of the actual elements or portions. Additionally, although specific embodiments are described in detail herein, these embodiments are illustrative only and are not to be considered restrictive or exhaustive in any respect. Therefore, for those of ordinary skill in the art, various changes and modifications to the present invention should be obvious and can be easily accomplished without departing from the spirit and principles of the invention.

It will be understood that, although the terms "first", "second", "third" etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/or /or parts shall not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a 'first element', 'component', 'region', 'layer' or 'section' discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.

Referring to FIGS. 1 and 2A , FIG. 1 is a schematic perspective view of a packaging box according to an embodiment of the present invention, and FIG. 2A is a schematic top view of a packaging box according to an embodiment of the present invention. As shown in FIG. 1 , the packaging box 10 according to the embodiment of the present invention includes a packaging body 100 and a filling structure 200 . In FIG. 1 , the packaging body 100 is a three-dimensional structure, and the shape of the packaging body 100 is generally rectangular when viewed from a top view, as shown in FIG. 2A . The peripheral area of the packaging body 100 is the relatively thick side wall portion 110 , while the inner area of the packaging body 100 is the box bottom 120 which is relatively thin and is surrounded by the side wall portion 110 . In other words, the packaging body 100 has a structure with a recessed area 130 in the inner region, and the bottom surface of the recessed area 130 is the top surface of the box bottom 120 .

In FIG. 2A , when the packaging box 10 is viewed from a bird's-eye view, the packaging body 100 has a surface. The surface of the packaging body 100 represents the first supporting surface 150 in the top surface of the box bottom 120 , and the surface of the packaging body 100 is on the side wall. The area of the top surface of portion 110 represents second support surface 160 . That is, the shape of the first supporting surface 150 is a rectangle, and the shape of the second supporting surface 160 is an annular shape. In FIGS. 1 and 2A , the filling structure 200 is disposed in the recessed area 130 and connected to the bottom surface. Moreover, the location where the filling structure 200 is disposed is preferably in an area close to the junction of the side wall portion 110 of the packaging body 100 and the bottom 120 of the box.

The above-mentioned packaging body 100 and filling structure 200 each have different composition materials. For example, the packaging body 100 may be made of new foam material, and the filling structure 200 may be made of used foam material. In other words, the filling structure 200 uses recycled foam materials. The components of foam materials can be various types of plastics, such as expanded polystyrene (EPS), expanded polypropylene (EPP), expanded ethylene polymer (Expandable Polyvinyl Polymer, EPO) and foamed polystyrene (EPS). Polyethylene (Expandable Polyethylene, EPE) and other materials.

In addition, the packaging body 100 uses a new foam material, the constituent particles of the material are not lost, and the shape of each particle in the material is closer to a spherical shape. On the contrary, the filling structure 200 is made of recycled foaming material. The constituent particles of the material have been lost after use, or have been broken down during the recycling process. The shape of each particle in the material is relatively irregular, and the surface is less smooth. In one embodiment, the average sphericity of the material particles of the packaging body 100 is closer to 1 than the average sphericity of the material particles of the filling structure 200 . In another embodiment, under the same volume, the surface area of the material particles of the packaging body 100 is smaller than the surface area of the material particles of the filling structure 200 . Detailed material properties of the packaging body 100 and the filling structure 200 will be described in subsequent paragraphs of the description.

The aforementioned average sphericity represents the shape parameter of the constituent particles in the foam material, and the sphericity of a particle represents the ratio of the surface area of a sphere with the same volume as the particle to the surface area of the particle. It is known that the surface area of a sphere is the smallest under the premise of the same volume. If a particle is closer to a sphere, the sphericity of the particle is closer to 1. On the contrary, the more fragmented the shape of the particles, the larger the surface area, which means that the sphericity of the particles is closer to 0. The packaging body 100 of the embodiment of the present invention is composed of a new foam material, and the shape of each particle in the material is relatively close to a spherical shape. Therefore, the average sphericity of the constituent materials of the packaging body 100 is closer to 1 than the average sphericity of the constituent materials of the filling structure 200 .

As shown in FIG. 1 , the filling structure 200 is configured to have a side wall 210 , and a groove 500 is formed between the side wall 210 of the filling structure 200 and the packaging body 100 . In other words, when the packaging box 10 is viewed from top to bottom, the filling structure 200 is surrounded by the groove 500 and is not in direct contact with the packaging body 100 , thus avoiding poor bonding between the two materials due to differences in composition particles and uneven stress. , causing the packaging box to warp, deform or be poorly formed.

Referring to FIG. 2B , which is a schematic cross-sectional view of a filling structure and a trench according to an embodiment of the present invention. Specifically, FIG. 2B is an example cross-sectional view of the position along AA′ in FIG. 1 . The trenches 500 surrounding the filling structure 200 are preferably configured to have equal trench widths 500W, and the widths of the trenches 500 Not larger than 5mm. Furthermore, the depth 500D of the groove surrounding the filling structure 200 is set to be less than 50% of the thickness of the packaging body 100 at the corresponding position in the thickness direction. For example, the groove 500 of the filling structure 200 is disposed on the first supporting surface 150 of the box bottom 120 of the packaging body 100, and as indicated by the parallel Z-axis direction in FIG. 2B, the groove depth 500D is less than the thickness of the box bottom. 50%. In addition, when placing items to be carried (such as a display panel) in the packaging box 10 , it is necessary to consider whether the bottom 120 of the box has uneven stress that may cause damage to the items to be carried. Therefore, the filling structure 200 and the packaging body 100 are preferably disposed flush with each other on the surface. In other words, the filling structure 200 and the packaging body 100 are disposed flush with each other on the first supporting surface 150 and the second supporting surface 160 .

In the following, different embodiments in which the filling structure 200 is provided in the packaging body 100 will be described in detail. Refer to FIG. 3 , which is a schematic top view of the configuration of the filling structure on the first support surface according to an embodiment of the present invention. As shown in the figure, in order to avoid using recycled foam material as a composition to affect the structural strength of the overall packaging box 10 , it is preferable to dispose the filling structure 200 at the edge area of the first supporting surface 150 of the packaging body 100 . For example, the filling structure 200 is disposed on the first edge area 600 of the rectangular first supporting surface 150 .

In Figure 3, the first supporting surface 150 has a rectangular long side 150L and a rectangular short side 150W. The first edge area 600 is preferably provided at the interface area between the box bottom 120 and the side wall part 110 of the packaging body. For example, the first edge area 600 presents a ring-shaped distribution of the filling structure 200 along the boundary area between the box bottom 120 and the side wall part 110 of the packaging body. The width of this annular distribution in the direction along the rectangular long side 150L of the first supporting surface 150 is not greater than 25% of the rectangular long side 150L, that is, the width of the filling structure 200 along the direction parallel to the X-axis in FIG. 3 is not greater than the rectangular length. 25% of side 150L. Moreover, the width of this annular distribution in the direction along the rectangular short side 150W of the first support surface 150 is not greater than 25% of the rectangular short side 150W, that is, the width of the filling structure 200 along the direction parallel to the Y-axis in FIG. 3 is not greater than 25% of 150W on the short side of the rectangle. In the embodiment of FIG. 3 , the filling structure 200 is arranged to avoid the middle area of the packaging body 100 , so that when the packaging box 10 carries items, the weight of the items will not be concentrated on the filling structure 200 and increase the risk of damage to the packaging box 10 . Chance of deformation or damage.

However, the placement position of the filling structure 200 is not limited to the above embodiment. The filling structure 200 may also be disposed not to contact the carrying items, that is, not to be disposed on the first supporting surface 150 . For example, the filling structure 200 is disposed on the opposite side of the box bottom 120 from the first supporting surface 150 (not shown). The weight of the loaded items will not be directly distributed to the filling structure 200 and affect the overall structural strength of the packaging box 10 . In addition, the filling structure 200 may be arranged on the first supporting surface 150 in a structure that does not completely surround the first edge area 600 . For example, the filling structure 200 can be as shown in FIG. 2A . Two filling structures 200 are provided in the first edge area 600 , and each has two free ends facing each other but not connecting. This arrangement further reduces the impact of the filling structure 200 on the overall structural strength of the packaging box 10 .

In addition to disposing the filling structure 200 on the first supporting surface 150 of the box bottom 120 , the filling structure 200 can also be disposed on the second supporting surface 160 of the side wall part 110 . Refer to Figure 4, which is a schematic top view of the configuration of the filling structure on the second support surface according to an embodiment of the present invention. As shown in the figure, when the filling structure 200 is disposed on the second supporting surface 160 of the side wall portion 110, the impact of its position on the overall structural strength of the packaging box 10 also needs to be considered. When multiple packaging boxes 10 are stacked, the second supporting surface 160 of the side wall portion 110 of the packaging box 10 will serve as the main area to support the weight of the packaging box 10 .

Therefore, in the embodiment of FIG. 4 , the detailed shape of the second supporting surface 160 is first described. Since the packaging box 10 is generally rectangular when viewed from a top view, the periphery of the side wall portion 110 of the packaging box 10 can be represented as the long side 160L1, the long side 160L2, the short side 160S1 and the short side 160S2 of the second supporting surface. In addition, the four vertices of the rectangular packaging box 10 may be represented as vertices 160V1 to 160V4 of the second supporting surface 160 . Furthermore, the distance between the interface between the side wall portion 110 and the first supporting surface 150 and the periphery of the side wall portion 110 can be expressed as the width 160W1 and the width 160W2 of the second supporting surface 160 . The filling structure 200 is preferably disposed in the second edge region 701 to the second edge region 704 of the annular second supporting surface 160 . As shown in FIG. 4 , each second edge region is formed as a distribution that incompletely surrounds the second supporting surface 160 , that is, the shape of each second edge region is L-shaped.

The range of each second edge region preferably extends from the vertex 160V1 to the vertex 160V4 along the long side direction of the second support surface 160 by no more than 33% of the length of the long side. In detail, in the second edge region 701, the vertex 160V1 and the extension in the direction along the -X axis are no more than 33% of the length of the long side 160L1. In the second edge region 702, the vertex 160V2 extends in the direction of the -X axis by no more than 33% of the length of the long side 160L2. In the second edge region 703, the vertex 160V3 extends in the direction of the +X axis by no more than 33% of the length of the long side 160L2. In the second edge region 704, the vertex 160V4 extends in the direction of the +X axis by no more than 33% of the length of the long side 160L1.

Moreover, the vertices 160V1 to 160V4 respectively extend along the short side of the second support surface 160 by no more than 33% of the length of the short side. In detail, in the second edge region 702, the vertex 160V2 extends in the direction of the -Y axis no more than 33% of the length of the short side 160S1. In the second edge region 703, the vertex 160V3 extends in the direction of the -Y axis by no more than 33% of the length of the short side 160S2. In the second edge region 701, the vertex 160V1 extends in the direction of the +Y axis by no more than 33% of the length of the short side 160S1. In the second edge region 704, the vertex 160V4 extends in the direction of the +Y axis by no more than 33% of the length of the short side 160S2.

As for the width of each second edge region, it is preferably set to no greater than 33% of the width of the second supporting surface 160 . In detail, the second edge region is configured to extend from each vertex toward the long side direction by no more than 33% of the length of the long side, and from each vertex toward the short side direction by no more than 33% of the length of the short side, and from Each long side extends no more than 33% of the width in the direction toward the short side, and extends no more than 33% of the width in the direction from each short side toward the long side.

As in the embodiment shown in FIG. 4 , the width of the filling structure 200 in each second edge region is no greater than the width of the second supporting surface 160 . For example, in the second edge area 701, the distance that the filling structure 200 extends from the short side 160S1 to the -X-axis direction is no more than 33% of the width 160W1 of the second supporting surface 160, and the filling structure 200 extends from the long side 160L1 to +Y The distance extending in the axial direction is no more than 33% of the width 160W2 of the second supporting surface 160 .

Similarly, in the second edge area 702, the distance that the filling structure 200 extends from the short side 160S1 to the -X-axis direction is not greater than 33% of the width 160W1 of the second support surface 160, and the filling structure 200 extends from the long side 160L2 to -X The distance extending in the Y-axis direction is no greater than 33% of the width 160W2 of the second supporting surface 160 . In the second edge area 703 , the distance that the filling structure 200 extends from the short side 160S2 to the +X-axis direction is no greater than 33% of the width 160W1 of the second support surface 160 , and the filling structure 200 extends from the long side 160L2 to the -Y-axis direction. The extended distance is no greater than 33% of the width 160W2 of the second support surface 160 . In the second edge area 704 , the distance that the filling structure 200 extends from the short side 160S2 to the +X-axis direction is no greater than 33% of the width 160W1 of the second support surface 160 , and the filling structure 200 extends from the long side 160L1 to the +Y-axis direction. The extended distance is no greater than 33% of the width 160W2 of the second support surface 160 .

The packaging box 10 described in the above embodiment can be implemented by the following manufacturing method. Referring to FIGS. 5 and 6 , FIG. 5 is a schematic side view of a packaging box manufacturing equipment and mold according to an embodiment of the present invention, and FIG. 6 is a schematic flow chart of a packaging box manufacturing method according to an embodiment of the present invention. As shown in FIG. 5 , the packaging box manufacturing mold 800 at least separates a first area 801 and a second area 802 with a partition 810 , and the first area 801 is preferably configured to surround the second area 802 .

In step 901 of the flowchart 900, a new foam material serving as the packaging body 100, that is, the first foam material 300, is injected into the first area 801. The particles of the first foam material 300 have more spherical particles, and the particles of the first foam material 300 are preferably configured such that the proportion of sphericity is greater than 0.75 and is greater than 90%. In contrast, in step 902 of FIG. 6 , the recycled foam material as the filling structure 200 is injected into the second area 802 , that is, the second foam material 400 . The particles of the second foam material 400 have fewer spherical particles, and the particles of the second foam material 400 are preferably configured such that the proportion of sphericity is greater than 0.75 and less than 10%. In other words, the average sphericity of the particles of the first foamed material 300 is closer to 1 than the average sphericity of the particles of the second foamed material 400 .

If the size of the second foam raw material constituting the second foam material 400 does not meet the size of the injection equipment for manufacturing the mold 800, the second foam raw material can be minced with appropriate equipment until the sphericity of the particles is greater than 0.75. The proportion is less than 10%. Furthermore, in order to achieve a reuse design using recycled materials when making the packaging box 10 , the total weight of the second foaming material 400 is preferably configured to be greater than 5% of the total weight of the packaging box 10 . When injecting the second foam material 400 into the second area 802, it is preferable to configure the second foam material 400 to be flush with the first foam material 300 on the surface of the packaging box 10, so as to reduce the load of the packaging box 10. The uneven surface of the object causes uneven stress. The surface of the packaging box 10 may be the first supporting surface 150 located on the bottom 120 of the box, or the second supporting surface 160 located on the top surface of the side wall part 110, as in the previous embodiment.

Next, in step 903 of FIG. 6 , the first foam material 300 and the second foam material 400 are hot-pressed under the same temperature and pressure conditions to form the packaging body 100 and the filling structure 200 to form the packaging box 10 , that is, packaging. The main body 100 and the filling structure can integrate the manufacturing process, and there is no need to make them separately and then bond them, which will not increase the manufacturing complexity of the packaging box 10 .

What is described above are only some preferred embodiments of the present invention. It should be noted that various changes and modifications can be made to the present invention without departing from the spirit and principles of the invention. It should be apparent to those of ordinary skill in the art that the present invention is defined by the appended claims, and that in compliance with the spirit of the present invention, various possible substitutions, combinations, modifications, and conversions can be made without departing from the scope of the present invention. scope defined by the appended claims.

Claims (14)

1. A packaging box containing: A packaging body has a surface, and a recessed area is formed on the surface, and the recessed area has a bottom surface; wherein the packaging body includes a first foaming material; and A filling structure is provided in the recessed area and connected to the bottom surface, and the filling structure has a side wall, wherein the first foam material surrounds the side wall, and a groove is formed between the first foam material and the side wall; The filling structure includes a second foaming material, and the average sphericity of the particles of the first foaming material is closer to 1 than the average sphericity of the particles of the second foaming material. 2. The packaging box of claim 1, wherein the packaging body has a box bottom and a side wall portion surrounding the box bottom, and the top surface of the box bottom is the first supporting surface, and the top surface of the side wall portion It is a second supporting surface, and the recessed area is formed on at least one of the first supporting surface and the second supporting surface. 3. The packaging box of claim 2, wherein the first support surface is rectangular, and the filling structure is provided at a first edge area of the first support surface; wherein the first edge area is annular, and the The width of the first edge region in the direction parallel to the long side of the rectangle is not greater than 25% of the long side of the rectangle, and the width of the first edge region in the direction parallel to the short side of the rectangle is not greater than 25% of the short side of the rectangle. 4. The packaging box of claim 3, wherein the filling structure in the first edge area is a structure that does not completely surround the first edge area. 5. The packaging box of claim 2, wherein the second support surface is an annular area, and the outside of the side wall portion defines the long side, short side and vertex of the annular area, and the side wall portion and the third side wall portion are The distance between the intersection of a supporting surface and the outside of the side wall defines the width of the annular area; The filling structure is provided in the second edge area of the annular area, and the second edge area is defined as: extending from each vertex toward the long side by no more than 33% of the length of the long side, and extending from each vertex toward the short side. The side direction extension is no more than 33% of the length of the short side, and the extension from each long side towards the short side is no more than 33% of the width, and the extension from each short side towards the long side is no more than 33% of the width. 33% of that width. 6. The packaging box of claim 1, wherein the proportion of sphericity of the particles of the first foaming material is greater than 0.75 and is greater than 90%. 7. The packaging box of claim 1, wherein the proportion of sphericity of the particles of the second foaming material is greater than 0.75 and less than 10%. 8. The packaging box of claim 1, wherein the total weight of the second foam material is greater than 5% of the total weight of the packaging box. 9. The packaging box of claim 1, wherein the second foam material is flush with the first foam material on the surface. 10. The packaging box of claim 1, wherein the depth of the groove is less than 50% of the thickness of the packaging body at the corresponding position. 11. The packaging box of claim 10, wherein the grooves surrounding the filling structure have equal widths, and the widths are no greater than 5 mm. 12. A method of manufacturing a packaging box, including at least the following steps: Injecting the first foam material into the first area of the mold; Inject the second foaming material into the second area of the mold, wherein the first area surrounds the second area, and there is a partition between the first area and the second area, and the particles of the first foaming material The average sphericity is closer to 1 than the average sphericity of the particles of the second foaming material; and The first foaming material and the second foaming material are heat-pressed to form the packaging box, wherein the heat-pressing conditions of the first foaming material and the second foaming material are the same. 13. The manufacturing method of claim 12, further comprising: mincing the second foam raw material to form the second foam material, wherein the proportion of sphericity of the particles of the second foam material is greater than 0.75 and less than 10%. 14. The manufacturing method of claim 12, wherein injecting the second foam material into the second area of the mold includes: placing the second foam material and the first foam material on the surface of the packaging box Flush on top.