Degradable environment-friendly plant fiber packaging box with visible film and window and preparation method of degradable environment-friendly plant fiber packaging box

Abstract

The invention provides a degradable environment-friendly plant fiber packaging box with a visible film window and a preparation method of the degradable environment-friendly plant fiber packaging box with the visible film window. A composite welding mold installed on an ultrasonic sheet sealing machine is manufactured, and the composite welding mold comprises an upper mold and a lower mold which are oppositely arranged; an upper pressing die matched with the window in shape and larger than the window in size is arranged on the side, opposite to the lower die, of the upper die, and the side, opposite to the upper die, of the lower die is sunken to form a die positioning area; an environment-friendly film blank is placed in a film positioning area of the lower die, a plant fiber degradable environment-friendly packaging box with a window is correspondingly arranged above the environment-friendly film blank in a covering mode, and an upper pressing die of the upper die is driven to descend relative to the position where the film positioning area close to the lower die is located to achieve die assembly; and after mold closing, ultrasonic welding is conducted to obtain the environment-friendly plant fiber degradable environment-friendly package with the visible film window.

Description

Technical Field

[0001] The invention relates to the field of degradable environmentally friendly packaging boxes, and in particular to a plant fiber degradable environmentally friendly packaging box with a visible film window and a preparation method thereof. Background Art

[0002] Plant fiber degradable environmentally friendly packaging boxes are environmentally friendly products. They use natural plant fibers as the main raw materials, such as bamboo fiber, straw fiber, corn starch, etc. This type of packaging box is designed to reduce the impact on the environment. They can be naturally degraded and will not accumulate in the environment and become a source of pollution like traditional plastic products. With the increasing global awareness of environmental protection, plant fiber degradable environmentally friendly packaging boxes have become a popular choice to replace traditional plastic packaging.

[0003] Plant fiber degradable and environmentally friendly packaging boxes are often used as environmentally friendly lunch boxes or other food packaging. For example, restaurants, canteens and take-out services often use plant fiber degradable and environmentally friendly packaging boxes to pack food. For example, food manufacturers use plant fiber degradable and environmentally friendly packaging boxes to pre-package fruits, eggs and other foods for transportation. In order to achieve the effect of sealing the packaged items, most plant fiber degradable and environmentally friendly packaging boxes are designed as a complete plane to cooperate with the box body to form a complete enclosed space for accommodating the packaged items. However, in scenarios where plant fiber degradable and environmentally friendly packaging boxes need to be able to visually display the packaged items, such as retail scenarios where customers need to be able to view the packaged items in the plant fiber degradable and environmentally friendly packaging box without opening the plant fiber degradable and environmentally friendly packaging box, it is necessary to open a transparent window on the plant fiber degradable and environmentally friendly packaging box.

[0004] The preparation process of the plant fiber biodegradable and environmentally friendly packaging boxes with transparent windows currently on the market is: post-processing the complete packaging box to open the window, and then using glue to adhere the transparent film to the window opened on the packaging box. For example, the US200500986A solution is a preparation process of adhering the transparent film to the covering window. However, this process requires the use of additional glue to adhere the transparent film, but the components of the glue are various polymers and chemical additives, which means that the glue is not environmentally friendly either in the production or degradation process, and does not conform to the green concept of biodegradable and environmentally friendly packaging boxes. Summary of the invention

[0005] The purpose of the present invention is to provide a plant fiber degradable and environmentally friendly packaging box with a visible film window and a preparation method thereof, and to adopt ultrasonic welding technology and a specially designed composite welding mold to realize the preparation of the plant fiber degradable and environmentally friendly packaging box with a visible film window, so as to obtain a green and environmentally friendly plant fiber degradable and environmentally friendly packaging box with a visible film window.

[0006] To achieve the above objectives, the present technical solution provides a method for preparing a plant fiber degradable environmentally friendly packaging box with a visible film window, comprising the following steps:

[0007] S1: Make a biodegradable and environmentally friendly packaging box made of plant fibers with windows;

[0008] S2: manufacturing an environmentally friendly film embryo, wherein the shape of the environmentally friendly film embryo matches the shape of the window and the size of the environmentally friendly film embryo is larger than the size of the window;

[0009] S3: manufacturing a composite welding mold installed on an ultrasonic sealing machine, wherein the composite welding mold comprises an upper mold and a lower mold arranged opposite to each other, an upper pressing mold having a shape matching the shape of the window and a size larger than the size of the window is provided on one side of the upper mold opposite to the lower mold, and a side of the lower mold relative to the upper mold is recessed to form a membrane positioning area;

[0010] S4: placing the environmentally friendly film blank into the film positioning area of ​​the lower mold and placing the corresponding cover of the plant fiber degradable environmentally friendly packaging box with an opening window on the environmentally friendly film blank, driving the upper pressing mold of the upper mold to descend relative to the position close to the film positioning area of ​​the lower mold to achieve mold closing;

[0011] S5: After the mold is closed, the ultrasonic sealing machine is started to perform ultrasonic welding. After the welding is completed, the upper pressing mold of the upper mold is driven to rise relative to the position where the film positioning area away from the lower mold is located to realize mold opening, and the plant fiber biodegradable environmentally friendly packaging box with a visible film window is taken out.

[0012] In addition, the present solution provides a plant fiber degradable environmentally friendly packaging box with visible film windows prepared according to the above-mentioned method for preparing a plant fiber degradable environmentally friendly packaging box with visible film windows.

[0013] Compared with the prior art, this technical solution has the following characteristics and beneficial effects:

[0014] 1. This solution adopts ultrasonic welding and sets up a special composite welding mold to achieve the attachment of the environmentally friendly film to the window of the plant fiber degradable environmentally friendly packaging box without the need for additional viscose materials, thereby forming a plant fiber degradable environmentally friendly packaging box with a visible film window, meeting the requirements of green environmental protection.

[0015] 2. This solution can directly produce plant fiber biodegradable and environmentally friendly packaging boxes with windows through the plant fiber molding process. Different from the method of forming first and then opening holes, this solution can save a lot of plant fiber raw materials and further reduce costs.

[0016] 3. The composite welding mold designed in this scheme uses the design of positioning protrusions and film positioning areas so that the environmentally friendly film can be firmly attached to the plant fiber degradable environmentally friendly packaging box to form a visible film window, thereby improving the quality of the final processed plant fiber degradable environmentally friendly packaging box with a visible film window. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of a method for preparing a plant fiber degradable and environmentally friendly packaging box with a visible film window according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the composite welding mold according to the present invention.

[0019] Figure 3 Detailed structural diagram of the membrane positioning area of ​​the composite welding mold according to the present invention.

[0020] Figure 4 It is a detailed structural schematic diagram of the third positioning groove in the film positioning area of ​​the composite welding mold according to the present invention.

[0021] Figure 5 It is a schematic diagram of the preparation process of a plant fiber biodegradable environmentally friendly packaging box with a visible film window according to an embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the preparation process of a plant fiber biodegradable environmentally friendly packaging box with a visible film window according to another embodiment of the present invention.

[0023] Figure 7 It is a schematic diagram of a plant fiber biodegradable and environmentally friendly packaging box with a visible film window.

[0024] In the figure: upper mold -10, lower mold -20, membrane positioning area -21, first positioning groove -211, second positioning groove -212, third positioning groove -213, positioning protrusion -2131, inner ring boss -2132, outer ring boss -2133. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0026] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0027] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0028] The present invention provides a method for preparing a plant fiber biodegradable and environmentally friendly packaging box with a visible film window. The method adopts ultrasonic sealing technology and designs a special composite mold to attach a transparent film to the plant fiber biodegradable and environmentally friendly packaging box with a window in an environmentally friendly and pollution-free manner. The design of the special composite mold can improve the adhesion quality of the transparent film to the plant fiber biodegradable and environmentally friendly packaging box.

[0029] Specifically, Figure 1 As shown, the method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window provided in the present solution comprises the following steps:

[0030] S1: Make a biodegradable and environmentally friendly packaging box made of plant fibers with windows;

[0031] S2: manufacturing an environmentally friendly film embryo, wherein the shape of the environmentally friendly film embryo matches the shape of the window and the size of the environmentally friendly film embryo is larger than the size of the window;

[0032] S3: manufacturing a composite welding mold installed on an ultrasonic sealing machine, wherein the composite welding mold comprises an upper mold and a lower mold arranged opposite to each other, an upper pressing mold having a shape matching the shape of the window and a size larger than the size of the window is provided on one side of the upper mold opposite to the lower mold, and a side of the lower mold relative to the upper mold is recessed to form a membrane positioning area;

[0033] S4: placing the environmentally friendly film blank into the film positioning area of ​​the lower mold and placing the corresponding cover of the plant fiber degradable environmentally friendly packaging box with an opening window on the environmentally friendly film blank, driving the upper pressing mold of the upper mold to descend relative to the position close to the film positioning area of ​​the lower mold to achieve mold closing;

[0034] S5: After the mold is closed, the ultrasonic sealing machine is started to perform ultrasonic welding. After the welding is completed, the upper pressing mold of the upper mold is driven to rise relative to the position where the film positioning area away from the lower mold is located to realize mold opening, and the plant fiber biodegradable environmentally friendly packaging box with a visible film window is taken out.

[0035] In some embodiments, the plant fiber biodegradable and environmentally friendly packaging box with a window can be a cover or a cover body, and the specific choice is adjusted according to the actual product needs.

[0036] Step S1 of the present scheme adopts the plant fiber molding process to directly produce a plant fiber degradable and environmentally friendly packaging box with an opening. Specifically, step S1 of the present scheme further includes the steps of: processing in a plant fiber mold forming machine to obtain a wet embryo; transferring the wet embryo to a hot press for heating and molding to obtain a dry product; transferring the dry product to a slicer for trimming to obtain a plant fiber degradable and environmentally friendly packaging box with an opening.

[0037] It should be noted that the wet blank processed by the present scheme can be a hollow wet blank or a non-hollow wet blank. When the wet blank is a hollow wet blank, step S1 of the present scheme further includes the steps of: processing the hollow wet blank in a plant fiber mold forming machine to obtain a hollow wet blank, wherein the hollow wet blank is provided with a hollow hole whose size is smaller than the size of the window; transferring the hollow wet blank to a hot press for heating and molding to obtain a hollow dry product; transferring the hollow dry product to a slicer for trimming to obtain a plant fiber degradable and environmentally friendly packaging box with a window, wherein the hollow hole is trimmed to obtain a window.

[0038] At this time, this scheme designs a molding mold with hollow holes for the plant fiber biodegradable and environmentally friendly packaging box with visible film windows. Correspondingly, in the plant fiber mold molding machine, the plant fiber can be injected into the molding mold to obtain a hollow wet embryo with hollow holes, thereby reducing the amount of plant fiber raw materials required for the hollow wet embryo. Compared with the traditional process of punching or cutting holes in packaging boxes such as foam boxes or paper boxes, this method can greatly save raw material costs and shorten the processing steps.

[0039] In addition, it should be noted that the hollow wet embryo is provided with a hollow hole 5 to 8 mm smaller than the size of the window. The advantage of this design is that the window that meets the design requirements can be obtained through fine-tuning of the trimming machine later, while also not wasting too much plant fiber raw materials.

[0040] Correspondingly, the hollow dry product is transferred to a slicer for inner and outer trimming. The shape of the hollow hole is corrected by inner trimming to obtain a window that meets the design requirements, and the rough edges of the plant fiber degradable and environmentally friendly packaging box are corrected by outer trimming.

[0041] In step S2, the shape of the environmentally friendly film body prepared by this scheme matches the shape of the window opening and the size of the environmentally friendly film body is 3 to 8 mm larger than the size of the window opening, so that the environmentally friendly film body can completely cover the window opening to achieve a sealing effect. Specifically, the size of the environmentally friendly film body prepared by this scheme is 3 to 8 mm larger than the edge of the window opening. For example, if the window opening is a circular hole with a diameter of 2 cm, the environmentally friendly film body is a circular film with a diameter of 2.3 to 2.8 m. If the window opening is a rectangular hole of 1*2 cm, the environmentally friendly film body is a rectangular film with a diameter of (1.3 to 1.8)*(2.3 to 2.8) m.

[0042] In addition, the thickness of the environmental protection film embryo of this scheme is 0.05-0.2mm. The advantage of such a design is that it facilitates the quality of ultrasonic welding. Specifically, ultrasonic welding converts mechanical energy into thermal energy through high-frequency vibration, thereby melting the materials on the welding surface to combine them. If the membrane of the environmental protection film embryo is too thick, the energy of the ultrasonic wave may be excessively absorbed or attenuated before reaching the welding interface, resulting in poor welding effect; on the contrary, if the membrane of the environmental protection film embryo is too thin, it may reach the required temperature in a short time, and stopping the vibration too early may cause the welding to be weak; and the thickness of the membrane of the environmental protection film embryo directly affects the melting degree and contact area of ​​the welding area. The appropriate thickness can ensure that the material reaches the optimal melting state, thereby obtaining sufficient welding strength.

[0043] The membrane material of the environmentally friendly membrane embryo of this scheme is selected from any one of degradable plant fiber transparent membrane paper, PLA material or PET material, wherein the degradable plant fiber transparent membrane paper refers to the degradable plant fiber transparent membrane paper prepared from plant fibers such as wood pulp, paper pulp, bagasse and bamboo fiber, and the PLA material is a bioplastic polymerized from lactic acid produced by fermentation of corn starch, sugar cane or other renewable resources. This scheme preferably uses environmentally friendly degradable plant fiber transparent membrane paper and PLA material as the membrane material of the environmentally friendly membrane embryo.

[0044] In addition, as mentioned above, the membrane material of the environmentally friendly film embryo will also affect the degree of ultrasonic welding. Therefore, when the membrane material of the environmentally friendly film embryo is degradable plant fiber transparent film paper, the thickness of the environmentally friendly film embryo is 0.05~0.10mm, when the membrane material of the environmentally friendly film embryo is PLA material, the thickness of the environmentally friendly film embryo is 0.1~0.15mm, when the membrane material of the environmentally friendly film embryo is PET material, the thickness of the environmentally friendly film embryo is 0.125~0.20mm.

[0045] This scheme designs a composite mold specifically for ultrasonic welding of plant fiber biodegradable environmentally friendly packaging boxes with visible film windows, such as Figure 2As shown, the composite welding mold of the present scheme is installed on an ultrasonic sealing machine, and the composite welding mold includes an upper mold 10 and a lower mold 20 arranged relatively to each other, wherein the upper mold 10 is provided with an upper pressure mold (not shown in the figure) on one side relative to the lower mold 20, and the shape of the upper mold 10 matches the shape of the window and the size is larger than the size of the window, and the lower mold 20 is recessed on one side relative to the upper mold 10 to form a membrane positioning area 21.

[0046] In some embodiments, Figure 3 As shown, the membrane positioning area 21 includes a first step groove 211, a second step groove 212 and a third step groove 213 arranged in a stepped manner, wherein the widths of the first step groove 211, the second step groove 212 and the third step groove 213 decrease successively. In other words, the membrane positioning area 21 of this solution is designed with a first step groove 211, a second step groove 212 and a third step groove 213 whose widths decrease successively from top to bottom. The first step groove 211 in the membrane positioning area 21 of this solution serves as an extrusion support plane of the upper mold to support the upper mold 10, the second step groove 212 serves as a support plane of the environmentally friendly membrane blank to place the environmentally friendly membrane blank, and the third step groove 213 serves as an ultrasonic welding sealing layer to arrange uniform convex points for ultrasonic welding. Correspondingly, in step S4, the environmentally friendly film blank is placed on the second step groove 212 in the film positioning area 21 of the lower mold, and the corresponding cover of the plant fiber degradable environmentally friendly packaging box with a window is placed on the environmentally friendly film blank. The upper pressing mold of the upper mold is driven to descend relative to the position close to the film positioning area of ​​the lower mold until the upper mold is supported on the first step groove 211.

[0047] In order to facilitate ultrasonic welding, the environmentally friendly film blank is pressed and welded on the plant fiber biodegradable environmentally friendly packaging box with a window, such as Figure 4 As shown, a plurality of positioning protrusions 2131 are evenly arranged on the third step groove 213 of the membrane positioning area 21 of the present solution, and the positioning protrusions 2131 are raised relative to the plane of the third step groove 213 and are evenly distributed.

[0048] In some embodiments, the heights of the plurality of positioning protrusions 2131 evenly arranged on the third step groove 213 are the same, and the height of the positioning protrusions 2131 is 0.6-1 mm. Preferably, the height of the positioning protrusions 2131 is 0.8 mm.

[0049] In addition, the present solution does not impose any particular restrictions on the shape of the positioning protrusion 2121, and the shape of the positioning protrusion 2131 can be selected to be any one or a combination of a circle, an ellipse, a rectangle, a triangle, and a pentagon. In other words, the same third positioning groove 213 can be provided with positioning protrusions 2131 of the same shape or positioning protrusions 2131 of different shapes.

[0050] In addition, in order to ensure that ultrasonic welding can firmly weld the environmentally friendly film blank to the plant fiber degradable environmentally friendly packaging box with a window, the inner edge protrusion of the third step groove 213 is provided with an inner ring boss 2132, and the outer edge protrusion is provided with an outer ring boss 2133, wherein the inner ring boss 2132, the outer ring boss 2133 and the positioning boss 2121 are at the same height, and the positioning boss 2121 is evenly arranged in the space formed by the inner ring boss 2132 and the outer ring boss 2133. The advantage of such a setting is that the inner ring boss 2132, the outer ring boss 2133 and the positioning boss 2121 can form indentations on the environmentally friendly film blank, so that the environmentally friendly film blank can be ultrasonically welded to the plant fiber degradable environmentally friendly packaging box with a window under the action of ultrasonic welding.

[0051] In some embodiments, the width of the third step groove 213 is 4-7 mm, and correspondingly, the distance between the inner ring boss 2132 and the outer ring boss 2133 is set to 4-7 mm.

[0052] In some embodiments, an upper die having a shape matching the shape of the window and a size larger than the size of the window by 5 to 12 mm is provided on one side of the upper die 10 relative to the lower die 20. In other words, the size of the upper die on the upper die 10 is 2 to 4 mm larger than the size of the environmentally friendly film blank, and the size of the upper die is 5 to 12 mm larger than the size of the window. Preferably, the size of the upper die is 6 to 11 mm larger than the size of the window. The advantage of such a setting is that the upper die can be used to press the environmentally friendly film blank, so that the upper die can cooperate with ultrasonic welding to achieve press welding.

[0053] In addition, the shape of the lower mold 20 of the present solution matches the shape design of the plant fiber degradable environmentally friendly packaging box with a window, so that when the environmentally friendly film blank is placed in the film positioning area of ​​the lower mold, the plant fiber degradable environmentally friendly packaging box with a window can be attached to the lower mold 20 and placed above the environmentally friendly film blank. In other words, the lower mold 20 of the present solution is designed relative to the upper mold 10 to match the shape of the plant fiber degradable environmentally friendly packaging box with a window, so that the window of the plant fiber degradable environmentally friendly packaging box with a window is attached to the film positioning area.

[0054] Specifically, in step S4, the environmentally friendly film blank is placed on the second positioning groove 212 of the lower mold 20, the plant fiber degradable environmentally friendly packaging box with a window is set on the lower mold 20, and the window is set relative to the environmentally friendly film blank, and then the upper die of the upper mold is driven to descend relative to the position where the film positioning area near the lower mold is located to achieve mold closing, and the upper mold 10 after mold closing is set on the first positioning groove 211 and the upper die is set relative to the environmentally friendly film blank on the second positioning groove 212. In some embodiments, the width of the first positioning groove 211 is greater than the width of the upper die to ensure that the upper die can always press the environmentally friendly film blank during the ultrasonic welding process. In step S5, after the mold is closed, the ultrasonic sealing machine is started to perform ultrasonic welding, so that the convex point on the third positioning groove 213 cooperates with the ultrasonic welding to press the environmentally friendly mold blank on the plant fiber degradable environmentally friendly packaging box with a window to form a plant fiber degradable environmentally friendly packaging box with a visible film window.

[0055] The preparation method of the plant fiber degradable environmentally friendly packaging box with a visible film window of the present scheme is as follows Figure 5 and Figure 6 As shown, Figure 5 and Figure 6 Two methods of preparing plant fiber biodegradable and eco-friendly packaging boxes with visible film windows were demonstrated respectively: first, a hollow wet blank was prepared by a plant fiber molding process, and then the edges were trimmed to form a plant fiber biodegradable and eco-friendly packaging box with windows, the environmentally friendly film blank was placed in the film positioning area of ​​the lower mold and the plant fiber biodegradable and eco-friendly packaging box with windows was put on the lower mold to realize the mold closing process, and finally the corresponding plant fiber biodegradable and eco-friendly packaging box with visible film windows was obtained.

[0056] like Figure 7 As shown, the plant fiber degradable environmentally friendly packaging box with a visible film window provided by the present solution includes an environmentally friendly film and a plant fiber degradable environmentally friendly packaging box body with a window, wherein the environmentally friendly film is attached to the window position of the plant fiber degradable environmentally friendly packaging box body with a window, and the attachment position of the environmentally friendly film and the window position forms an indentation, and the shape of the indentation matches the shape of the positioning protrusion 2131, the inner circle boss 2122 and the outer circle boss 2123 on the third positioning groove 213. It should be noted that, since the present solution adopts ultrasonic welding to prepare the plant fiber degradable environmentally friendly packaging box with a visible film window, the environmentally friendly film forms an indentation on one side of the window position, and the other side is a flat plane. In other words, when the environmentally friendly film blank is pressed from the inside to the outside relative to the plant fiber degradable environmentally friendly packaging box body with a window, the inner side of the connection position of the environmentally friendly film and the plant fiber degradable environmentally friendly packaging box body with a window forms an indentation, and the outer side of the connection position of the environmentally friendly film and the plant fiber degradable environmentally friendly packaging box body with a window is a flat surface.

[0057] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A method for preparing a plant fiber degradable environmentally friendly packaging box with a visible film window, characterized in that: The following steps are involved: S1: Make a biodegradable and environmentally friendly packaging box made of plant fibers with windows; S2: manufacturing an environmentally friendly film embryo, wherein the shape of the environmentally friendly film embryo matches the shape of the window and the size of the environmentally friendly film embryo is larger than the size of the window; S3: manufacturing a composite welding mold installed on an ultrasonic sealing machine, wherein the composite welding mold comprises an upper mold and a lower mold arranged opposite to each other, an upper pressing mold having a shape matching the shape of the window and a size larger than the size of the window is provided on one side of the upper mold opposite to the lower mold, and a side of the lower mold relative to the upper mold is recessed to form a membrane positioning area; S4: placing the environmentally friendly film blank into the film positioning area of ​​the lower mold and placing the corresponding cover of the plant fiber degradable environmentally friendly packaging box with an opening window on the environmentally friendly film blank, driving the upper pressing mold of the upper mold to descend relative to the position close to the film positioning area of ​​the lower mold to achieve mold closing; S5: After the mold is closed, the ultrasonic sealing machine is started to perform ultrasonic welding. After the welding is completed, the upper pressing mold of the upper mold is driven to rise relative to the position where the film positioning area away from the lower mold is located to realize mold opening, and the plant fiber biodegradable environmentally friendly packaging box with a visible film window is taken out.

2. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 1, characterized in that: Step S1 further includes the steps of: processing a wet embryo in a plant fiber mold forming machine, transferring the wet embryo to a hot press for heating and molding to obtain a dry product; transferring the dry product to a slicer for trimming to obtain a plant fiber biodegradable and environmentally friendly packaging box with a window.

3. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 2, characterized in that: A hollow wet embryo is processed in a plant fiber mold forming machine to obtain a hollow hole, wherein the hollow wet embryo is provided with a hollow hole whose size is smaller than that of the window; the hollow wet embryo is transferred to a hot press for heating and molding to obtain a hollow dry product; the hollow dry product is transferred to a slicer for trimming to obtain a plant fiber degradable and environmentally friendly packaging box with a window, wherein the hollow wet embryo is provided with a hollow hole whose size is 5 to 8 mm smaller than that of the window.

4. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 1, characterized in that: In step S2, the size of the environmentally friendly film embryo is 3 to 8 mm larger than the size of the window, and the thickness of the environmentally friendly film embryo is 0.05 to 0.2 mm.

5. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 1, characterized in that: The film positioning area includes a first step groove, a second step groove and a third step groove arranged in a stepped manner, wherein the widths of the first step groove, the second step groove and the third step groove decrease successively, and the environmentally friendly film blank is placed in the second step groove in the film positioning area of ​​the lower mold.

6. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 5, characterized in that: A plurality of positioning convex points are evenly arranged on the third step groove of the film positioning area, and the positioning convex points are raised relative to the plane of the third step groove and are evenly distributed.

7. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 6, characterized in that: The inner edge protrusion of the third step groove is provided with an inner ring boss, and the outer edge protrusion is provided with an outer ring boss, wherein the inner ring boss, the outer ring boss and the positioning boss are at the same height.

8. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 5, characterized in that: The width of the third step groove is 4-7 mm. An upper pressing die having a shape matching the shape of the window and a size larger than the size of the window by 5-12 mm is provided on one side of the upper die opposite to the lower die.

9. The method for preparing the plant fiber degradable environmentally friendly packaging box with a visible film window according to claim 1, characterized in that: The shape of the lower mold matches the shape of a plant fiber biodegradable and environmentally friendly packaging box with an opening.

10. A plant fiber degradable environmentally friendly packaging box with a visible film window, prepared according to the preparation method of the plant fiber degradable environmentally friendly packaging box with a visible film window according to any one of claims 1 to 9, characterized in that: It comprises an environmental protection film and a plant fiber degradable environmental protection packaging box body with a window, wherein the environmental protection film is attached to the window position of the plant fiber degradable environmental protection packaging box body with a window, and an indentation is formed at the attachment position of the environmental protection film and the window position.

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