Grid film, pulp molded product preparation process and pulp molded product

Abstract

The present disclosure provides a mesh film, a pulp molded product preparation process and a pulp molded product, wherein the mesh film includes a mesh and a soluble structure, wherein the soluble structure includes at least a filling portion arranged in the pores of the mesh, and the soluble structure and the mesh form a film layer, and the soluble structure has solubility that can be dissolved by a solution, and the pulp molded product preparation process includes slurry treatment, wet blank mesh forming and hot pressing and shaping the meshed wet blank product, and during the wet blank mesh forming process, the meshed wet blank product is formed on the mold by vacuum slurry absorption with the help of the mesh film. Based on the mesh film, the present disclosure greatly improves the bursting strength and impact resistance of the pulp molded product, and improves the overall protective performance of the packaging.

Description

Technical Field

[0001] The present disclosure relates to the field of packaging technology, and in particular to a grid film, a pulp molded product preparation process, and a pulp molded product. Background Art

[0002] Pulp molded products are an environmentally friendly packaging material made of natural paper plastic fibers through a molding process. Due to the characteristics of the material itself (long and short fibers interlaced), when pulp molded products are used to package large-volume products, they are very easy to break, causing product damage, thus losing the packaging protection function. Although the packaging protection function of pulp molded products can be improved by increasing the thickness or by increasing the amount of pulp absorption, increasing the thickness will increase the amount of raw pulp used, resulting in increased energy loss during the production process; although increasing the amount of pulp absorption can increase the material density, it will also increase the amount of raw pulp used and increase costs. Summary of the invention

[0003] In view of this, in order to at least partially solve the above technical problems, the present disclosure first provides a grid membrane, and the technical solution is as follows.

[0004] A mesh membrane, comprising:

[0005] a mesh having pores; and

[0006] a soluble structure, the soluble structure comprising at least a filling portion disposed in the pores, and the soluble structure and the net forming a film layer;

[0007] The soluble structure has solubility that it can be dissolved by a solution.

[0008] In one embodiment, the dissolvable structure further includes an outer layer covering the film layer.

[0009] In one embodiment, the net is a cotton fiber net or a nylon net.

[0010] According to another aspect of the present disclosure, a process for preparing a pulp molded product is provided, comprising the steps of:

[0011] Pulp processing, in which paperboard fibers are pulped and mixed to form a final pulp, and the final pulp is supplied to a production mold including a male mold and a female mold;

[0012] Wet blank laying and forming, using a mesh film on a production mold to form a wet blank product through vacuum slurry absorption; and

[0013] The wet web product is hot pressed to shape to obtain the final product.

[0014] In one embodiment, in the wet web laying and forming step, the process includes:

[0015] The concave mold is slurried once to form the underlying structure;

[0016] The mesh film is transferred to the top of the concave mold, and the mesh film is attached to the underlying structure by vacuuming;

[0017] The lowering die performs secondary slurry suction to form a mesh interlayer; and

[0018] The concave and convex dies are combined to squeeze and dehydrate the mesh interlayer to form a wet blank.

[0019] In one embodiment, the step of performing secondary slurry absorption on the descending die includes the steps of dissolving the soluble structure of the mesh membrane to form a hollow net, and absorbing slurry from the hollow net to form a mesh interlayer with an underlying structure.

[0020] In one possible implementation manner, when the mesh film is transferred to the top of the concave mold, the distance between the mesh film and the top of the concave mold is 9 mm to 11 mm.

[0021] According to another aspect of the present disclosure, a pulp molded product is provided, which is produced by the pulp molded product production process as described above.

[0022] In one embodiment, the pulp molded product comprises:

[0023] an omentum layer, the omentum layer having a first surface and a second surface opposite to each other;

[0024] a first pulp layer disposed on the first surface; and

[0025] A second pulp layer is located on the second surface.

[0026] In one embodiment, the web layer includes a web having pores and a pulp filling structure located in the pores.

[0027] The present invention is based on the grid film, which greatly improves the bursting strength and impact resistance of pulp molded products and improves the overall protective performance of the packaging.

[0028] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0030] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0031] Figure 1 A structural diagram of a mesh membrane according to an embodiment of the present disclosure is shown;

[0032] Figure 2 Shows Figure 1 Cross-sectional view of the mesh membrane;

[0033] Figure 3 A process flow chart of a pulp molded product preparation process according to an embodiment of the present disclosure is shown;

[0034] Figure 4a Shows Figure 3 Schematic diagram of the wet web laying process (I);

[0035] Figure 4b Shows Figure 3 Schematic diagram of the wet web laying process (II);

[0036] Figure 4c Shows Figure 3 Schematic diagram of the wet web laying process (III);

[0037] Figure 4d Shows Figure 3 Schematic diagram of the wet web laying process (IV);

[0038] Figure 4e Shows Figure 3 Schematic diagram of the wet web laying process in (V);

[0039] Figure 4f Shows Figure 3 Schematic diagram of the wet web laying process in (VI);

[0040] Figure 5 A partial structural diagram of a pulp molded product according to an embodiment of the present disclosure is shown.

[0041] Explanation of the numbers in the figure: 10, mesh membrane; 11, mesh; 12, soluble structure; 121, filling part; 122, outer layer; 1221, first outer layer; 1222, second outer layer; 21, mesh layer; 22, first pulp layer; 23, second pulp layer; 30, production mold; 31, concave mold; 32, convex mold; 33, pulp pool; 34, base. DETAILED DESCRIPTION

[0042] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0043] like Figure 1 and Figure 2 As shown, the mesh film 10 includes a net 11 and a soluble structure 12, the net 11 has pores, the soluble structure 12 includes a filling portion 121 arranged in the pores, and the soluble structure 12 and the net 11 form a membrane layer, wherein the soluble structure 12 has solubility that can be dissolved by a solution. When making the mesh film 10, a mesh sheet such as a fiber net with pores can be soaked in a water-soluble resin solution and then dried. In a dry state, the mesh film 10 is a uniform and dense film, and the net is contained in the film. Since the mesh film 10 is airtight, it can be attached to the surface of a special-shaped structure by vacuum adsorption.

[0044] See again Figure 1 and Figure 2 In one embodiment of the present disclosure, the soluble structure 12 has an outer layer 122 covering the membrane layer in addition to the filling part 121 disposed in the pores. The membrane layer has an upper and lower surfaces relative to each other. The outer layer 122 includes a first outer layer 1221 disposed on the upper surface and a second outer layer 1222 disposed on the lower surface. Based on the arrangement of the outer layer 122, the air tightness of the mesh membrane 10 can be better ensured.

[0045] In one embodiment of the present disclosure, the net 11 is a cotton fiber net. It should be understood that the net 11 can also be a nylon net or the like.

[0046] The mesh membrane 10 disclosed in the present invention can be used in specific processes, such as pulp molding wet blank forming, and can be vacuum adsorbed on the surface of the preformed wet blank in the interval between two slurry absorptions. During the second slurry absorption, the soluble structure 12 of the mesh membrane 10 dissolves under the aqueous solution and vacuum pressure, exposing the hollow network structure, which is conducive to the fiber interlacing of the two slurry absorptions and avoids stratification. The following is an introduction to the preparation process of pulp molding products in combination with the mesh membrane 10.

[0047] like Figures 3 to 4f As shown, the process for preparing pulp molded products according to the present disclosure comprises:

[0048] Step S100, pulp processing, to make the paperboard fiber into the final pulp through pulping and pulping, and supply the final pulp to the production mold 30 including the male mold 32 and the female mold 31. It should be understood that the production mold 30 includes a base 34 and a pulp pool 33 in addition to the male mold 32 and the female mold 31. The base 34 is used to install the male mold 32 and the female mold 31, and is used to form the pulp pool 33. The pulp pool 33 is used to hold the final pulp made after pulping. The male mold 32 and the female mold 31 can be raised and lowered relative to the base 34. The female mold 31 is provided with air holes to facilitate vacuuming for pulp absorption. The production mold 30 can adopt a traditional wet blank molding mold. The traditional wet blank molding mold belongs to the prior art and will not be described in detail here.

[0049] Step S200, wet blank is laid and formed, and a wet blank product is formed by vacuum slurry absorption on a production mold 30 with the help of a mesh film 10; and

[0050] Step S300, hot pressing and shaping the wet blank product to obtain the final product.

[0051] Since step S100 and step S300 are the same as the conventional process, they will not be described in detail here.

[0052] Combined with reference Figures 4a to 4f , in the wet web laying and forming step, including:

[0053] The concave mold 31 is vacuumed by means of the air holes to perform a slurry suction to form a bottom layer structure, such as Figure 4a In this step, by controlling the slurry suction time and pressure, a bottom layer structure with half the thickness is formed on the concave mold 31. The thickness is reduced by half here relative to the traditional wet blank forming process (the traditional wet blank forming only includes one vacuum slurry suction and dehydration step);

[0054] The concave mold 31 is lifted, and then the mesh film 10 is transferred to the top of the concave mold 31, and vacuum is drawn again by means of the air holes so that the mesh film 10 is attached to the underlying structure. Figure 4b and Figure 4c ;

[0055] The descending concave mold 31 performs secondary slurry suction to form a mesh sandwich, such as Figure 4d ;as well as

[0056] The concave mold 31 and the convex mold 32 are combined to squeeze and dehydrate the mesh interlayer, and then the convex mold 32 is lifted to form a wet blank for laying the mesh. Figure 4e and Figure 4f .

[0057] Specifically, the secondary slurry absorption step of the descending die 31 includes the steps of dissolving the soluble structure 12 of the mesh film 10 to form a hollow net, and evacuating the die 31 to absorb the slurry from the hollow net to form a mesh sandwich with the underlying structure.

[0058] In one embodiment of the present disclosure, when the mesh film 10 is transferred to the top of the concave mold 31, the distance between the mesh film 10 and the top of the concave mold 31 is 9 mm, 10 mm, or 11 mm. In this way, on the one hand, the mesh film 10 can be attached to the underlying structure during vacuuming; on the other hand, the mesh film 10 can be prevented from interfering with the concave mold 31 during the transfer process.

[0059] According to another aspect of the present disclosure, a pulp molded product is further provided. The pulp molded product of the present disclosure is produced by the pulp molded product production process as described above.

[0060] like Figure 5 As shown, the pulp molded product includes a mesh layer 21, a first pulp layer 22 and a second pulp layer 23. The mesh layer 21 has a first side and a second side opposite to each other (the first side and the second side are not marked in the figure), the first pulp layer 22 is located on the first side, and the second pulp layer 23 is located on the second side.

[0061] In the embodiment of the present disclosure, the mesh layer 21 includes a mesh with pores and a pulp filling structure located in the pores, which can be referred to in Figure 2 ,and Figure 2 The difference is that in the web layer 21 of the pulp molded product, the pulp filling structure is located in the pores.

[0062] The pulp molded product of the embodiment of the present invention was compared with the pulp molded product made by a traditional process through a bursting strength test. The pulp molded product made by the traditional process had a bursting strength of 2325.51 kPa, the pulp molded product made by the mesh film 10 of the cotton fiber mesh had a bursting strength ≥5300 kPa, and the pulp molded product made by the mesh film 10 of the nylon mesh (120 mesh) had a bursting strength ≥4914.75 kPa. It can be seen that the present invention greatly improves the bursting strength of the pulp molded product and improves the overall protective performance of the packaging.

[0063] From the above, it can be seen that the pulp molded product and pulp molded product preparation process disclosed in the present invention, based on the grid film, have the following advantages:

[0064] 1. Greatly improve the bursting strength and impact resistance of pulp molded products, and improve the overall protective performance of the packaging.

[0065] 2. After using degradable fiber materials for laying the net, the excellent environmental performance of pulp molded products can still be maintained.

[0066] 3. Compared with the traditional structure, this solution is a lightweight solution while maintaining the same strength, which is beneficial to reducing material costs.

[0067] 4. Solved the problem of automatic mesh laying on special-shaped structures.

[0068] 5. The sandwich structure is a mesh, and the fibers of the upper and lower layers can still be intertwined, avoiding separation of the upper and lower layers.

[0069] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0070] For ease of description, spatially relative terms such as "above", "above", "on the upper surface", "above", etc. may be used here to describe the spatial positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that spatially relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein.

[0073] The present disclosure has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present disclosure to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present disclosure is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present disclosure, and these variations and modifications all fall within the scope of protection claimed by the present disclosure. The scope of protection of the present disclosure is defined by the attached claims and their equivalents.

Claims

1. A process for preparing pulp molded products, characterized in that: Includes steps: Slurry processing, in which paperboard fibers are pulped and mixed to form a final slurry, and the final slurry is supplied to a production mold (30) including a male mold (32) and a female mold (31); Wet blank mesh forming, forming a wet blank product by vacuum slurry absorption on a production mold (30) with the aid of a mesh film (10); as well as The wet blank product is hot-pressed to shape to obtain the final product; The mesh membrane comprises: a mesh (11) having pores; and A soluble structure (12), the soluble structure (12) comprising at least a filling portion (121) arranged in the pores, and the soluble structure (12) and the net (11) forming a membrane layer; wherein the soluble structure (12) has solubility capable of being dissolved in an aqueous solution; In the wet web laying and forming step, it includes: Performing a slurry suction on the concave mold (31) to form a bottom layer structure; The mesh film (10) is transferred to the top of the concave mold (31), and the mesh film (10) is attached to the underlying structure by vacuuming; The descending concave mold (31) performs secondary slurry suction to form a mesh sandwich; and The concave mold (31) and the convex mold (32) are combined to squeeze and dehydrate the mesh interlayer to form a mesh-laid wet blank product.

2. The process for preparing pulp molded products according to claim 1, characterized in that: The dissolvable structure (12) further comprises an outer layer (122) covering the film layer.

3. The process for preparing pulp molded products according to claim 1, characterized in that: The net (11) is a cotton fiber net or a nylon net.

4. The process for preparing pulp molded products according to claim 1, characterized in that: The step of performing secondary slurry absorption on the descending concave mold (31) includes the steps of dissolving the soluble structure (12) of the mesh film (10) to form a hollow net, and forming a mesh sandwich with an underlying structure after slurry absorption on the hollow net.

5. The process for preparing pulp molded products according to claim 1, characterized in that: During the process of transferring the mesh film (10) to the top of the concave mold (31), the distance between the mesh film (10) and the top of the concave mold (31) is 9 mm to 11 mm.

6. A pulp molded product, characterized in that: The pulp molded product is prepared by the process for preparing the pulp molded product according to any one of claims 1 to 5.

7. The pulp molded product according to claim 6, characterized in that include: A mesh layer (21), wherein the mesh layer (21) has a first surface and a second surface opposite to each other; A first pulp layer (22) located on the first surface; as well as A second pulp layer (23) is located on the second surface.

8. The pulp molded product according to claim 7, characterized in that The mesh layer (21) comprises a hollow mesh with pores and a pulp filling structure located in the pores.

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