Forming process of paper holder with paper lining and paper holder formed by adopting process

Abstract

The invention discloses a forming process of a paper support with a paper lining and the paper support formed by adopting the process, and the forming process comprises the following steps: providing at least one layer of paper combination, and pretreating the paper combination; the pretreated paper combination is transferred to a forming area of a forming mold for mold closing and hot pressing; the surface of the hot-pressed paper is subjected to negative-pressure water desorption in a forming cavity, and a paper support with a containing groove is formed; and the mold is split, and air blowing separation is conducted on the surface of the paper support. The paper holder formed in the mode is good in ductility and supporting performance, is full and highly consistent in uniformity through experimental inspection, can avoid complete dependence on the forming procedure from paper pulp to paper blank, and reduces the source limitation of paper raw materials.

Description

Technical Field

[0001] The invention relates to the technical field of paper tray forming technology, and in particular to a paper tray forming technology with a paper lining and a paper tray formed by the technology. Background Art

[0002] The paper tray is one of the components in the product packaging box that is used to support the product. A groove that matches the shape of the product is formed on the top of the paper tray to hold the product. The quality of the paper tray is directly related to the customer's intuitive feeling after unpacking the product, and indirectly affects the sales volume of the product. Therefore, the paper tray is of great significance to product packaging.

[0003] The current preparation of paper trays relies on the selection, processing and preparation of raw materials. From pulp to paper tray, a lot of pre-processing is required. The raw materials are first mixed and stirred, and then prepared into paper. For enterprises or manufacturers, it takes up a lot of space resources and time costs, making the complete process of preparing paper trays lengthy.

[0004] Therefore, there is still a need for a paper tray forming process with a paper lining and a paper tray formed by the process to solve the above problems. Summary of the invention

[0005] The present invention provides a solution to the above-mentioned problems.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A process for forming a paper tray with a paper lining, comprising:

[0008] Providing at least one layer of paper combination, and pre-treating the paper combination;

[0009] Transferring the pretreated paper combination to the forming area of ​​the forming mold for closing the mold and hot pressing;

[0010] Desorbing moisture from the surface of the hot-pressed paper under negative pressure in a forming cavity to form a paper tray with a storage groove;

[0011] The mold is separated and separated by blowing air on the surface of the paper tray.

[0012] Preferably, the paper combination comprises: a shaping paper layer A and a wet pulp embryo layer B, wherein the number of layers of the shaping paper layer A is greater than or equal to 1, and the number of layers of the wet pulp embryo layer B is greater than or equal to 0.

[0013] Preferably, when the paper combination is all formed paper, the forming process includes stacking the pre-treated formed paper in sequence in a forming area and hot pressing the pre-treated paper by closing a forming mold.

[0014] Preferably, the pretreatment process is:

[0015] The multi-layer forming paper is immersed in a solution containing a softener or a water absorbent, and the solution temperature is 5-25° C. for 3-5 minutes.

[0016] Preferably, when the paper combination comprises at least one layer of wet pulp embryo, the pretreatment step comprises:

[0017] Suck out and close the mold to form wet pulp embryo in the pulp suction mold;

[0018] The wet pulp embryo is placed in the lower mold of the forming mold, and then the forming paper is placed on the wet pulp embryo.

[0019] Preferably, the forming area of ​​the mold includes a guide net and guide holes, the guide net is located on the upper mold or the lower mold of the mold, the guide holes are located on the upper mold or the lower mold, and the guide holes are used to discharge moisture from the paper after flowing through the guide net from the forming area.

[0020] Preferably, the deepest depth of the storage groove is less than 1 / 2 of the width from the edge of the storage groove to the boundary of the molding area, the opening rate of the guide holes in the molding area is 1-3%, and the spacing between adjacent guide holes is 10-20 mm.

[0021] Preferably, when the surface of the hot-pressed paper is subjected to negative pressure desorption in the molding cavity, the negative pressure in the guide hole is 50-90 MPa;

[0022] The hot pressing time of the molding area during mold closing and hot pressing is 50-60s, and the pressure of the molding area during mold closing is 80-120kgf.

[0023] Preferably, it also includes:

[0024] The paper tray is visually inspected through light, and if the paper tray is qualified, the edges and corners of the paper tray are removed by a die-cutting assembly to obtain a final paper tray molded product.

[0025] A paper tray is prepared by any one of the above-mentioned paper tray forming processes.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least:

[0027] At least one layer of paper combination is used, wherein the paper combination includes at least one layer of molded paper. The molded paper is pre-treated, transferred to the molding area of ​​the molding mold, and the mold is closed and hot-pressed, and then the moisture on the surface of the paper is desorbed to form a paper tray with a storage groove. The paper tray formed in this way has good ductility and support. Experimental tests have shown that the uniformity is highly consistent, and it can avoid complete reliance on the formation process from pulp to paper embryo, reducing the source restrictions of paper raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the process structure of the molding process of an embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the lower mold structure of an embodiment of the present invention.

[0030] 1. Lower mold; 2. Molding area; 3. Guide hole. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0032] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of the present invention.

[0033] A first aspect of the present invention provides a process for forming a paper tray with a paper liner, comprising:

[0034] At least one layer of paper combination is provided, and the paper combination is pre-treated. One or more sheets of paper are stacked to form the paper combination.

[0035] The pre-treated paper combination is transferred to the forming area 2 of the forming mold for closing and hot pressing. The forming mold can be a mold including an upper mold and a lower mold, and the shape of the forming area 2 of the mold is the same as the shape of the preset paper tray.

[0036] The surface of the hot-pressed paper is dehydrated under negative pressure in the forming cavity to form a paper tray with a storage groove, so that the moisture on the paper is evenly removed.

[0037] The mold is separated and separated by blowing air on the surface of the paper tray.

[0038] At least one layer of formed paper is used. The formed paper is hot-pressed and closed inside the mold. The moisture of the formed paper is removed through the structure inside the mold to avoid local stress concentration when the paper is deformed. The paper has poor ductility and forms a paper tray with a storage slot. After experimental inspection, the paper tray made in this way has a uniform thickness and can stably support the product without deformation. The necessary pre-processing link of raw materials from pulp to paper embryo is broken. The raw materials can be directly formed paper, which simplifies the overall reduction method of the paper tray forming process and reduces production costs.

[0039] In one embodiment, the paper combination comprises: a shaping paper A layer, a pulp wet embryo B layer, the number of layers of the shaping paper A layer is greater than or equal to 1, and the number of layers of the pulp wet embryo B layer is greater than or equal to 0. The paper combination may include a layer of shaping paper, the shaping paper may be a pre-prepared hard paper, and the pulp wet embryo may be formed by pulp adsorption drying and a series of processes.

[0040] After experimental inspection, a layer of forming paper and a layer of wet pulp embryo are used, and the wet pulp embryo is used as the bottom layer, and the top is combined with the forming paper. Water infiltrates into the forming paper on the top through the wet pulp embryo. During compression and mold closing, the moistened forming paper provides good internal support force to avoid excessive local deformation of a single wet pulp embryo when the paper is extended, which leads to uneven fiber distribution. The density of the forming paper layer is greater than the fiber density of the wet pulp embryo. Through the combination of large and small densities, during pressing, the fibers of the wet pulp embryo can migrate and fill the bottom of the forming paper. While ensuring good ductility, the fiber uniformity of the paper tray is improved. The paper tray prepared in this way has good density.

[0041] Alternatively, one or more layers of forming paper may be used for direct forming. One or more layers of soaked paper may be transferred to a forming mold, which provides pressure while drying the absorbed moisture on the paper. This ensures uniform deformation of the paper and prevents concentrated accumulation of paper, which may lead to excessive local thickness.

[0042] Preferably, when the paper combination is all formed paper, the forming process includes stacking the pre-treated formed paper in the forming area 2 in sequence, and hot pressing the pre-treated paper by closing the forming mold. When all the pre-treated paper is formed paper, multiple layers of pre-treated paper are stacked, and then pressed and heated by the forming mold to form a paper tray.

[0043] Furthermore, the preprocessing process is:

[0044] The multi-layer forming paper is immersed in a solution containing a softener or a water absorbent at a temperature of 5-25°C for 3-5 minutes. When two or more layers of forming paper are selected, the pretreatment step is: the multi-layer forming paper is respectively immersed in a softener or a water absorbent solution at a temperature of 5-25°C for 3-5 minutes to reduce the hardness of the paperboard and allow moisture to be absorbed on the surface and inside of the paper. The paper pretreated in this way has good plasticity during lamination and forming, and the multi-layer forming paper maintains good ductility, avoiding the problem of excessive local stress or loose distribution of paper fibers during subsequent forming, which leads to damage of the formed paper tray.

[0045] In another further embodiment:

[0046] When the paper combination includes at least one layer of wet pulp embryo, the pretreatment step includes:

[0047] The mixed slurry is sucked into the slurry suction mold and initially shaped into a wet pulp embryo by extrusion in the slurry suction mold.

[0048] Place the wet pulp embryo on the lower mold of the forming mold, and then place the forming paper on the wet pulp embryo. The wet pulp embryo as the bottom layer can maintain good ductility and improve the consistency of the paper when forming the paper embryo.

[0049] Preferably, the molding area 2 of the mold includes a guide net and guide holes 3, wherein the guide net is located on the upper mold or the lower mold of the mold, and the guide holes 3 are located on the upper mold or the lower mold, and the guide holes 3 are used to discharge the moisture of the paper after flowing through the guide net from the molding area 2. The guide net is, for example, a metal wire mesh, which covers or is fixed to the upper mold or the lower mold of the mold. The guide holes 3 are located below the guide net. During hot pressing, the guide net is attached to the bottom of the paper, and the moisture of the paper fibers after deformation and extrusion is evenly distributed along the guide net and flows out along the guide holes 3. The guide net squeezes the paper evenly from the bottom, so that the paper can be deformed evenly when deformed, avoiding uneven moisture distribution, which causes the local material of the paper support to be evenly distributed during molding and rupture.

[0050] Reference Figure 2 The lower mold 1 shown is understood, and the molding area 2 is located in the internal position of the lower mold 1. The deepest depth of the storage groove is less than 1 / 2 of the width from the edge of the storage groove to the boundary of the molding area 2. After testing, within this range, it can ensure that the paper still has good ductility when forming a paper tray, and avoid the remaining paper area in the storage groove is insufficient, resulting in hollowing. The opening rate of the guide holes 3 in the molding area 2 is 1-3%, and the spacing between adjacent guide holes 3 is 10-20mm. The opening rate accounts for 1-3% of the total area of ​​the molding area 2. After experimental testing, the cooperation between the opening rate and the guide net within this range can maintain good guide performance and avoid uneven water when squeezing.

[0051] Preferably, when the surface of the hot-pressed paper is subjected to negative pressure desorption in the forming chamber, the negative pressure in the guide hole 3 is 50-90 MPa. Experimental tests have shown that the guide holes 3 within this range can effectively discharge the moisture during forming, thereby preventing the local humidity of the paper from being too high, which may cause the material of the paper to disperse during deformation and cause light transmission.

[0052] The hot pressing time of the molding area 2 is 50-60s, and the pressure of the molding area 2 is 80-120kgf. During the hot pressing process, the temperature field of the entire workpiece is more uniform, the longitudinal heat flow is limited, the energy consumption is reduced, and the material performance is improved.

[0053] Preferably, the process further comprises:

[0054] The paper tray is visually inspected through light transmission, and if the paper tray is qualified, the edges and corners of the paper tray are removed by a die-cutting component to obtain a final paper tray formed product. If the paper tray is still qualified after passing the visual inspection through light transmission, the paper tray is sent to the die-cutting component to remove the edges and corners outside the preset shape.

[0055] The draft angle of the paper support is greater than 1°. Experimental tests have shown that the paper support within this range can be stably formed and maintain good consistency.

[0056] Embodiment 1:

[0057] Select a piece of molded paper and a wet paper embryo formed in a pulp absorption mold by pulp absorption, manually soak the molded paper in a solution containing a softener at a temperature of 15°C for 4 minutes, then place the wet paper embryo on the lower mold of the molding mold, and place the molded paper on top of the wet paper embryo, then close the mold at a pressure of 90kgf for 55 seconds, and demold to form product 1.

[0058] Embodiment 2:

[0059] Select a piece of molding paper, manually soak the molding paper in a solution containing a softener at a temperature of 15°C for 4 minutes, then place the wet paper blank on the lower mold of the molding mold, and place the molding paper on top of the wet paper blank, then close the mold at a pressure of 90kgf for 55 seconds, and demold to form product 2.

[0060] Comparative Example 1:

[0061] Select two wet paper embryos formed in the pulp absorption mold by pulp absorption, and then stack the two wet paper embryos on the lower mold of the forming mold, and place the formed paper on top of the wet paper embryos, and then close the mold at a pressure of 90kgf for 55 seconds, and demold to form product 3.

[0062]

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A paper tray forming process with a paper lining, characterized in that: include: Providing at least one layer of paper combination, and pre-treating the paper combination; Transferring the pretreated paper combination to the forming area of ​​the forming mold for closing the mold and hot pressing; Desorbing moisture from the surface of the hot-pressed paper under negative pressure in a forming cavity to form a paper tray with a storage groove; The mold is separated and separated by blowing air on the surface of the paper tray.

2. The paper tray forming process according to claim 1, characterized in that: The paper combination comprises: a shaping paper A layer and a wet pulp embryo B layer, wherein the shaping paper A layer has a layer number greater than or equal to 1, and the wet pulp embryo B layer has a layer number greater than or equal to 0.

3. The paper tray forming process according to claim 2, characterized in that: When the paper combination is all formed paper, the forming process includes stacking the pre-treated formed paper in sequence in a forming area and hot pressing the formed paper by closing the forming mold.

4. The paper tray forming process according to claim 3, characterized in that: The pre-processing process is: The multi-layer forming paper is immersed in a solution containing a softener or a water absorbent, and the solution temperature is 5-25° C. for 3-5 minutes.

5. The paper tray forming process according to claim 2, characterized in that: When the paper combination includes at least one layer of wet pulp embryo, the pretreatment step includes: Suck out and close the mold to form wet pulp embryo in the pulp suction mold; The wet pulp embryo is placed in the lower mold of the forming mold, and then the forming paper is placed on the wet pulp embryo.

6. The paper tray forming process according to claim 1, characterized in that: The molding area of ​​the mold includes a guide net and a guide hole. The guide net is located on the upper mold or the lower mold of the mold. The guide hole is located on the upper mold or the lower mold. The guide hole is used to discharge the moisture of the paper after flowing through the guide net from the molding area.

7. The paper tray forming process according to claim 6, characterized in that: The deepest depth of the storage groove is less than 1 / 2 of the width from the edge of the storage groove to the boundary of the molding area. The opening rate of the guide holes in the molding area is 1-3%, and the spacing between adjacent guide holes is 10-20mm.

8. The paper tray forming process according to claim 6, characterized in that: When the surface of the hot-pressed paper is subjected to negative pressure desorption in the molding cavity, the negative pressure in the guide hole is 50-90 MPa; The hot pressing time of the molding area during mold closing and hot pressing is 50-60s, and the pressure of the molding area during mold closing is 80-120kgf.

9. The paper tray forming process according to claim 1, characterized in that: Also includes: The paper tray is visually inspected through light, and if the paper tray is qualified, the edges and corners of the paper tray are removed by a die-cutting assembly to obtain a final paper tray molded product.

10. A paper tray, characterized in that: The paper tray is prepared by the paper tray forming process described in any one of claims 1 to 9.

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