A method for preparing pulp molding

Abstract

The present invention provides a method for preparing pulp molding, which includes: mixing stainless steel fiber, polyvinyl alcohol, aluminum sulfate and wood fiber into pulp; setting an electromagnetic device on the target area of ​​the pulp absorption mold; placing the pulp absorption mold in the mixed pulp, and energizing the electromagnetic device to concentrate the stainless steel fiber in the pulp to the target area; and using vacuum pulp absorption to form a wet paper blank for preparing pulp molding. The above preparation method can improve the structural strength of the pulp molding, avoid the problem that the pulp molding is easily damaged at the position where the force is concentrated and becomes unusable, so as to better achieve the purpose of protecting the packaged product.

Description

Technical Field

[0001] The invention relates to the technical field of packaging materials, and in particular to a preparation method of pulp molding. Background Art

[0002] Pulp molded products are made of carton scraps, newsprint, white pure wood pulp, etc., which are pulverized and mixed into a certain concentration of pulp. A proper amount of additives are added to the molding machine to make the fibers evenly adsorbed on the mold surface by vacuum and pressure, thereby forming a fiber wet pulp molded blank with a geometric shape and size that fits the mold, and then further obtain pulp molded products. Pulp molded products are light in weight, high in compressive strength, good in cushioning performance, and easy to recycle and reuse after use. They are classic green packaging products and have been widely used at home and abroad in recent years. However, due to the material of the pulp molded products themselves, they are prone to damage at the location where the force is concentrated, which makes the pulp molded products unable to continue to be used, and it is also impossible to better protect the packaged products. Summary of the invention

[0003] In view of the above technical problems existing in the prior art, the present invention provides a preparation method of pulp molding.

[0004] An embodiment of the present invention provides a method for preparing pulp molding, the method comprising:

[0005] mixing stainless steel fiber, polyvinyl alcohol, aluminum sulfate and wood fiber into slurry;

[0006] An electromagnetic device is arranged on a target area of ​​the slurry suction mold;

[0007] Placing a slurry absorption mold in the mixed slurry, and energizing the electromagnetic device to concentrate the stainless steel fibers in the slurry to the target area;

[0008] A wet paper blank for pulp molding is formed by vacuum suction.

[0009] In some embodiments, the preparation method further comprises:

[0010] Fixing the magnet included in the electromagnetic device on the target area of ​​the slurry suction mold;

[0011] The magnet is energized via a cable electrically connected to the magnet.

[0012] In some embodiments, the weight percentage of the stainless steel fiber is 3% to 5% of the slurry.

[0013] In some embodiments, the weight percentage of the polyvinyl alcohol is 0.3% to 0.5% of the slurry; the weight percentage of the aluminum sulfate is 0.3% to 0.5% of the slurry.

[0014] In some embodiments, the stainless steel fiber has a diameter ranging from 2 μm to 8 μm and a length ranging from 2 mm to 3 mm.

[0015] In some embodiments, the preparation method further includes: controlling the adsorption force and movement parameters of the electromagnetic device on the stainless steel fiber based on the current parameters for energizing the electromagnetic device; wherein the current parameters include at least the current magnitude and the current passage time, and the movement parameters include at least the movement speed and movement distance of the stainless steel fiber.

[0016] In some embodiments, the electromagnetic device is provided on the target area of ​​the slurry suction mold, specifically comprising:

[0017] Determine the bending position of the slurry suction mold as the target area;

[0018] An electromagnet included in the electromagnetic device is arranged inside the bending part of the slurry suction mold.

[0019] In some embodiments, after the wet paper blank for pulp molding is formed by vacuum suction, the preparation method further comprises:

[0020] The wet paper blank is sent to the shaping mold for shaping, drying and shaping, and the pulp molded product is formed after shaping.

[0021] In some embodiments, the preparation method further comprises: coating an antistatic agent layer on the surface of the formed pulp molded product.

[0022] In some embodiments, the slurry suction mold is made of non-metallic material.

[0023] Compared with the prior art, the beneficial effect of the embodiments of the present invention is that: by mixing stainless steel fibers, polyvinyl alcohol, aluminum sulfate and wood fibers into the slurry, and by using an electromagnetic device arranged on the target area of ​​the slurry absorption mold, the stainless steel fibers in the slurry can be concentratedly adsorbed to the target area, thereby improving the structural strength of the pulp molding, avoiding the problem that the pulp molding is easily damaged at the position where the force is concentrated and becoming unusable, so as to better achieve the purpose of protecting the packaged products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0025] Figure 1 This is a flow chart of a method for preparing pulp molding according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a first implementation of a method for preparing pulp molding according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of a second implementation of the preparation method of pulp molding according to an embodiment of the present invention.

[0028] The components indicated by the reference numerals in the figures are:

[0029] 1- slurry; 2- slurry absorption mold; 21- target area. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments, but are not intended to limit the present invention.

[0031] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0033] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0035] The present invention provides a method for preparing pulp molding, such as Figure 1 As shown, the pulp molding preparation method includes steps S101 to S104.

[0036] Step S101: mixing stainless steel fiber, polyvinyl alcohol, aluminum sulfate and wood fiber into slurry 1.

[0037] Specifically, the stainless steel fiber has high thermal conductivity, which can transfer heat to the pulp molding faster and accelerate the drying efficiency. The stainless steel fiber has a high elastic modulus, and the fiber strength can reach 1200Mpa to 1800Mpa, thereby enhancing the strength of the pulp molding. In addition, the stainless steel fiber has good magnetic conductivity, and its aggregation degree can be controlled by a magnetic field, thereby adjusting the structural strength of the pulp molding.

[0038] Specifically, polyvinyl alcohol has the characteristic of being easy to form a film, and can increase the wettability and adhesion of the fiber surface.

[0039] Specifically, aluminum sulfate is used to adjust the pH value and neutralize anions in the slurry 1.

[0040] Specifically, the above-mentioned wood fibers mainly include bamboo fibers. The following is a performance comparison table of stainless steel fibers and bamboo fibers. It can be seen from this table that compared with bamboo fibers, stainless steel fibers have greater fiber strength, smaller diameter, and stronger thermal conductivity, magnetism, and softness.

[0041] Performance comparison table of stainless steel fiber and bamboo fiber

[0042] Fiber strength diameter Thermal conductivity magnetic Softness Bamboo Fiber 250MP 35μm to 140μm weak none powerful Stainless steel fiber 1200MP to 1800MP Less than 10μ powerful powerful powerful

[0043] Step S102: an electromagnetic device is arranged on the target area 21 of the slurry suction mold 2.

[0044] Specifically, the target area 21 can be set by the user based on experience, such as a stress-concentrated area in transportation, packaging, or other scenarios, or an area prone to wear, or an area prone to damage at a bend.

[0045] Specifically, the target area 21 may be a part of the slurry absorption mold 2 or the whole slurry absorption mold 2. That is, the electromagnetic device may be arranged on a part of the slurry absorption mold 2 or the whole slurry absorption mold 2.

[0046] Specifically, the electromagnetic device can be understood as a device that can generate a magnetic field when powered, so as to achieve the purpose of adsorbing the stainless steel fibers.

[0047] Step S103 : placing the slurry absorption mold 2 in the mixed slurry 1 , and energizing the electromagnetic device to absorb the stainless steel fibers in the slurry 1 to the target area 21 .

[0048] Specifically, Figure 2 and Figure 3 As shown, Figure 2 The stainless steel fibers in the slurry 1 shown in FIG. 1 are in a non-adsorbed state. Figure 3 The stainless steel limit in the slurry 1 shown in the figure is in an adsorbed state. After the electromagnetic device is powered on, the electromagnetic device will generate a magnetic field to adsorb the stainless steel fibers in the slurry 1 to the location of the electromagnetic device, that is, the target area 21, thereby increasing the structural strength of the position corresponding to the target area 21 of the formed pulp molding.

[0049] Step S104: forming a wet paper blank for pulp molding by vacuum suction.

[0050] Specifically, each fiber in the slurry 1 can be attached to the outer wall of the slurry absorption mold 2 under vacuum slurry absorption, thereby forming the wet paper blank. After the wet paper blank is processed, a pulp molded product can be obtained.

[0051] The present invention mixes stainless steel fibers, polyvinyl alcohol, aluminum sulfate and wood fibers into the slurry 1, and uses an electromagnetic device disposed on the target area 21 of the slurry absorption mold 2 to concentrate the stainless steel fibers in the slurry 1 on the target area 21, thereby improving the structural strength of the manufactured pulp molding, avoiding the problem that the pulp molding is easily damaged at the position where the force is concentrated and becoming unusable, so as to better achieve the purpose of protecting the packaged products.

[0052] In some embodiments, the preparation method further comprises:

[0053] Fixing the magnet included in the electromagnetic device on the target area 21 of the slurry suction mold 2;

[0054] The magnet is energized via a cable electrically connected to the magnet.

[0055] Specifically, the magnet is constructed as an electromagnet, which is placed on a fixed area of ​​the slurry suction mold 2, and is energized through a cable to generate a magnetic field.

[0056] In some embodiments, the weight percentage of the stainless steel fiber is 3% to 5% of the slurry 1 .

[0057] In some embodiments, the weight percentage of the polyvinyl alcohol is 0.3% to 0.5% of the slurry 1 ; the weight percentage of the aluminum sulfate is 0.3% to 0.5% of the slurry 1 .

[0058] In some embodiments, the stainless steel fiber has a diameter ranging from 2 μm to 8 μm and a length ranging from 2 mm to 3 mm.

[0059] Specifically, the softness of stainless steel fibers with a diameter range of 8 μm is equivalent to that of hemp fibers with a diameter of 13 μm, so that the stainless steel fibers can be effectively integrated with the bamboo fibers contained in the wood fibers.

[0060] In some embodiments, the preparation method further includes: controlling the adsorption force and movement parameters of the electromagnetic device on the stainless steel fiber based on the current parameters for energizing the electromagnetic device; wherein the current parameters include at least the current magnitude and the current passage time, and the movement parameters include at least the movement speed and movement distance of the stainless steel fiber.

[0061] Specifically, the electromagnetic device may be connected to a control device, and the control device may be used to control the current parameters for supplying power to the electromagnetic device.

[0062] Specifically, the adsorption force on the stainless steel fiber can increase with the increase of the current provided to the electromagnetic device; the adsorption force on the stainless steel fiber can increase with the increase of the current passing time provided to the electromagnetic device. The moving speed and moving distance of the above-mentioned stainless steel fiber will also increase with the increase of the current provided to the electromagnetic device, and with the increase of the current passing time provided to the electromagnetic device.

[0063] In some embodiments, the electromagnetic device is provided on the target area 21 of the slurry suction mold 2, specifically including:

[0064] Determine the bending position of the slurry suction mold 2 as the target area 21;

[0065] The electromagnet included in the electromagnetic device is arranged inside the bending part of the slurry suction mold 2.

[0066] Specifically, the slurry absorption mold 2 may have a cubic body with a plurality of bends, which are vulnerable areas. Electromagnets are arranged at the bends to concentrate and absorb the stainless steel fibers in the slurry 1 to the bends.

[0067] In some embodiments, after the wet paper blank for pulp molding is formed by vacuum suction, the preparation method further comprises: sending the wet paper blank to a shaping mold for shaping, drying and shaping, and forming a pulp molded product after shaping.

[0068] In some embodiments, the preparation method further comprises: coating an antistatic agent layer on the surface of the formed pulp molded product, so that the pulp molded product can be suitable for the transportation of products sensitive to electrostatic discharge in the scenario of user packaging.

[0069] In some embodiments, the slurry absorption mold 2 is made of non-metallic material. The slurry absorption mold 2 made of non-metallic material can prevent the metal material from affecting the magnetic field generated by the electromagnetic device.

[0070] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims will be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the implementation of this application, and the examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0071] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, a person of ordinary skill in the art can use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features can be grouped together to simplify the present invention. This should not be interpreted as an intention that a disclosed feature that is not required to be protected is necessary for any claim. On the contrary, the subject matter of the present invention may be less than all the features of a specific disclosed embodiment. Thus, the following claims are incorporated into the specific embodiments as examples or embodiments, wherein each claim is independently used as a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the attached claims and the full scope of equivalent forms granted by these claims.

[0072] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A method for preparing pulp molding, characterized in that: The preparation method comprises: mixing stainless steel fiber, polyvinyl alcohol, aluminum sulfate and wood fiber into slurry; An electromagnetic device is arranged on a target area of ​​the slurry suction mold; Placing a slurry absorption mold in the mixed slurry, and energizing the electromagnetic device to concentrate the stainless steel fibers in the slurry to the target area; A wet paper blank for pulp molding is formed by vacuum suction; wherein: The weight percentage of the stainless steel fiber is 3% to 5% of the slurry; The weight percentage of the polyvinyl alcohol is 0.3% to 0.5% of the slurry; The weight percentage of the aluminum sulfate is 0.3% to 0.5% of the slurry.

2. The method for preparing pulp molding according to claim 1, characterized in that: The preparation method further comprises: Fixing the magnet included in the electromagnetic device on the target area of ​​the slurry suction mold; The magnet is energized via a cable electrically connected to the magnet.

3. The method for preparing pulp molding according to claim 1, characterized in that: The diameter of the stainless steel fiber ranges from 2 μm to 8 μm, and the length ranges from 2 mm to 3 mm.

4. The method for preparing pulp molding according to claim 1, characterized in that: The preparation method further comprises: Based on the current parameters for energizing the electromagnetic device, the adsorption force and movement parameters of the electromagnetic device on the stainless steel fiber are controlled; wherein the current parameters at least include the current magnitude and the current passing time, and the movement parameters at least include the moving speed and moving distance of the stainless steel fiber.

5. The method for preparing pulp molding according to claim 1, characterized in that: The electromagnetic device is arranged on the target area of ​​the slurry suction mold, specifically comprising: Determine the bending position of the slurry suction mold as the target area; An electromagnet included in the electromagnetic device is arranged inside the bending part of the slurry suction mold.

6. The method for preparing pulp molding according to claim 1, characterized in that: After the wet paper blank for pulp molding is formed by vacuum suction, the preparation method further comprises: The wet paper blank is sent to the shaping mold for shaping, drying and shaping, and the pulp molded product is formed after shaping.

7. The method for preparing pulp molding according to claim 6, characterized in that: The preparation method further comprises: An antistatic agent layer is coated on the surface of the formed pulp molded product.

8. The method for preparing pulp molding according to claim 1, characterized in that: The slurry absorption mold is made of non-metallic material.

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