Preparation process for preventing scrap falling of pulping forming product and production line of pulping forming product

Abstract

The invention discloses a preparation process for preventing scrap falling of a pulping forming product, which comprises the following steps: (1) adding 20% of water into a pulp dispersing tank, and then matching and combining long fiber pulp and short fiber pulp, and putting into the pulp dispersing tank for soaking and dispersing; (2) after slurry dispersing is completed, the slurry is beaten into a buffer tank for slurry buffering; (3) refining the slurry in the buffer tank, and pumping the refined slurry into a refining tank; (4) adding a compound additive into the refining tank according to 4% of the weight of the dry pulp, and stirring for at least half an hour; (5) adding a waterproof agent into the refining tank, and continuously stirring for at least half an hour; (6) after stirring, conveying the slurry into a thick slurry tank for subsequent dilution; in this way, the mechanical strength and wear resistance and breakage resistance of the paper can be improved, and the problem of scrap falling caused by friction or vibration in the transportation process of paper-plastic products can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of packaging materials technology, and in particular to a preparation process and production line for preventing chipping of pulp-molded products. Background Technology

[0002] Pulping is the process of processing various raw materials into paper pulp. Raw materials can include wood, bamboo, waste paper, etc. Through the mechanical action and chemical treatment of pulping machinery, paper pulp of a certain concentration is obtained, which is then used in subsequent papermaking processes.

[0003] In traditional pulping processes, fibers and matrix particles (such as SiO2, CaCO3, etc.) are mainly bonded by physical entanglement or weak hydrogen bonds, lacking strong chemical bonds. As a result, the overall fiber bonding force is weak, and when the final paper product is subjected to vibration or friction, the particles can easily fall off the fiber surface, forming dust.

[0004] Paper lint can cause product surfaces to become rough and affect the feel; on the other hand, when used for food packaging or tableware, the fine fibers may get into the food, posing a hygiene risk. Summary of the Invention

[0005] The main technical problem solved by this invention is to provide a preparation process and production line for preventing chipping of pulped products. By adjusting the formula, production equipment and process, chipping is prevented and the product yield is guaranteed.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a preparation process for preventing chipping of pulp-forming products, comprising the following steps: (1) Add 20% water to the pulping tank, and then put the long fiber pulp and short fiber pulp into the pulping tank for soaking and pulping. (2) After the slurry is dispersed, the slurry is poured into a buffer tank for slurry buffering; (3) Next, the slurry in the buffer tank is refined and then pumped into the refining tank; (4) Add composite additives to the refining tank at 4% of the dry pulp weight and stir for at least half an hour; (5) Next, add the waterproofing agent to the refining tank and continue stirring for at least half an hour; (6) After mixing, the slurry is transported to the thickening tank for subsequent dilution and use.

[0007] Preferably, the long fiber pulp and short fiber pulp are selected from bamboo pulp and sugarcane pulp respectively, and are added at 65% and 35% by weight respectively.

[0008] Preferably, the soaking time is at least half an hour, and the dispersing time is at least ten minutes.

[0009] Preferably, the refining process uses three refining machines, and the refining current is controlled at 85A.

[0010] Preferably, the composite additive is composed of 28-30% fatty alcohol polyoxyethylene ether, 15-17% polyvinyl acetate, and 53-57% water.

[0011] Preferably, the amount of waterproofing agent added is 3.5% of the dry slurry weight.

[0012] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide a production line for preventing chipping of pulped products, used to complete the preparation process of preventing chipping of pulped products. The production line includes a pulper with a pulp tank. The pulp in the pulp tank is transferred to a buffer tank by a pulp pump to stabilize the pulp flow, optimize fiber quality, and balance production continuity. The pulp in the buffer tank is continuously refined by three refining machines and then pumped into the refining tank for the adjustment and stirring of relevant additives. After completion, it is transported to the thickening tank by a storage pump for subsequent dilution and use.

[0013] The beneficial effects of this invention are: This invention addresses the problem of easy shedding of surface debris in conventional pulping and molding products in existing technologies. Through the assembly of production lines, adjustment of formulas, and establishment of preparation processes, the resulting products, after repeated friction tests, not only exhibit improved mechanical strength and abrasion and burst resistance, effectively preventing the shedding of paper-plastic products during transportation due to friction or vibration, but also demonstrate that the formulation components of this invention can be used in conjunction with other agents without causing ionic conflicts. This effectively interweaves long and short fibers, preventing the shedding of short fibers, ensuring a high product yield, and improving the user experience, making it highly practical and applicable for widespread adoption. Attached Figure Description

[0014] Figure 1 This is a flowchart of a production line for preventing chipping of pulped and molded products according to the present invention; Figure 2 This is a schematic diagram of the appearance of a product made from conventional pulp. Figure 3 This is a schematic diagram of the appearance of a pulp molding product made using this invention. Detailed Implementation

[0015] The preferred embodiments of the present invention will now be described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0016] Example: This invention provides a manufacturing process for preventing lint shedding in pulp products, primarily addressing the common problem of lint shedding in commercially available pulp products. The main reason for lint shedding in traditional pulping processes is that fibers and matrix particles (such as SiO2, CaCO3, etc.) are mainly bonded through physical entanglement or weak hydrogen bonds, lacking strong chemical bonds. When pulp products are subjected to vibration or friction, particles detach from the fiber surface, forming dust. Furthermore, in conventional processes, fiber length is typically <1 mm, resulting in insufficient aspect ratio and difficulty in forming an effective three-dimensional network skeleton. Stress concentration in fiber agglomeration areas easily becomes crack initiation points, leading to localized peeling. The applicant carefully analyzed the causes of lint shedding and made targeted adjustments and innovations to the manufacturing process, formulation components, and production line.

[0017] First, add 20% water to the pulping tank. Then, combine long-fiber pulp and short-fiber pulp and add them to the pulping tank of the pulping machine for soaking and spreading. The soaking time should be at least half an hour, and the spreading time should be at least ten minutes. The long-fiber pulp and short-fiber pulp used in this invention correspond to bamboo pulp and sugarcane pulp, respectively, and are added at 65% and 35% by weight. We know that the average fiber length of bamboo pulp is 1.5~3.0 mm, and some fibers can reach more than 4.0 mm. Although it will be partially cut during the pulping process, it still retains a high proportion of long fibers, which is especially suitable for providing tensile strength and tear strength of paper. On the other hand, the average fiber length of bagasse is only 0.8~1.5 mm, and the fibers are fine and short. After pulping, the fiber length of bagasse is further shortened, but the fiber surface is rough, and the water retention and filling properties are excellent. The bagasse fibers fill the gaps between the long fibers of bamboo pulp, improving the paper uniformity and surface smoothness. Therefore, by controlling the weight ratio of the two, it helps to reduce shedding and improve the surface fineness.

[0018] After pulping is completed, the pulp in the pulping tank is transferred to the buffer tank by the pulping pump. The buffer tank can temporarily store the pulp after pulping to avoid the subsequent refining machine from running dry or overloaded due to fluctuations in the supply. On the other hand, the fiber suspension after pulping may have local differences in concentration or fiber distribution, such as the long fibers of bamboo pulp sinking and the short fibers of sugarcane pulp floating. The buffer tank uses low-speed stirring to make the pulp concentration, temperature and pH value uniform, avoiding the occurrence of flow deviation or selective refining during refining. At the same time, the buffer tank provides a residence time of 20 to 60 minutes to allow the fibers to naturally absorb water and expand, improving the efficiency of subsequent refining.

[0019] Next, the slurry in the buffer tank is refined and then pumped into the refining tank. This invention uses three refining machines and the refining current is controlled at 85A to obtain the best fiber uniformity. After the above refining, the bonding area between fibers can be significantly increased, the hydrogen bond bonding force can be improved, and the specific surface area of ​​the fiber can be increased by more than 100%, and the tensile strength can be increased by more than 30%.

[0020] During the refining process, a composite additive is added to the refining tank at 4% of the dry pulp weight, and then stirred for at least half an hour. The composite additive components selected in this invention are 28-30% fatty alcohol polyoxyethylene ether, 15-17% polyvinyl acetate, and 53-57% water. It can not only prevent fiber agglomeration and promote uniform pulp flow, but also form flexible bridges between fibers through physical adsorption and hydrogen bonding with cellulose, thereby improving the interlayer bonding strength of subsequent papermaking. For the final pulp product, it can not only improve tensile strength and tear resistance, but also reduce dusting rate and improve ink absorption uniformity.

[0021] Next, add the waterproofing agent to the refining tank and continue stirring for at least half an hour. The amount of waterproofing agent additive should be controlled at 3.5% of the dry pulp weight. This is mainly based on the consideration that the fiber will be broken down during the refining process, exposing more hydroxyl-OH groups. The waterproofing agent reacts with these active sites to form a hydrophobic film on the fiber surface, which is more uniform and thorough than surface coating. The waterproofing agent can be AKD wax, ASA, silicone or fluorocarbon.

[0022] Finally, the mixed slurry is transported to a thickening tank for subsequent dilution and use.

[0023] The production line used in the above preparation process is as follows: Figure 1 As shown, the system includes a pulper with a pulp tank. A pulp pump transfers the pulp from the pulp tank to a buffer tank to stabilize the pulp flow, optimize fiber quality, and balance production continuity. The pulp in the buffer tank is continuously refined by three refining machines and then pumped into a refining tank (also known as a storage tank) for the adjustment and stirring of relevant additives. After completion, it is transported to a thickening tank by a storage pump for subsequent dilution and use.

[0024] The paper formed from the pulp prepared by this invention was subjected to a lint-free test. Meanwhile, to visually demonstrate the technical effectiveness of the preparation process and production line of this invention, paper products prepared using conventional processes purchased from the market were subjected to an abrasion resistance test under the same conditions. The test data are as follows: The above tests clearly show that commercially available paper products made using traditional methods exhibit moderate fuzzing after 50 rubs. Further increasing the number of rubs results in very noticeable fuzzing. Figure 2 As shown, it is clear that the paper surface fibers are curled up, and the fuzzing phenomenon is obvious; while the paper surface prepared by this invention, under the same rubbing conditions, remains smooth and flat, which can be combined with... Figure 3 As shown, the technical effect of the solution of the present invention is obviously effective.

[0025] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A preparation process for preventing chipping in pulp-forming products, characterized in that, Includes the following steps: (1) Add 20% water to the pulping tank, and then put the long fiber pulp and short fiber pulp into the pulping tank for soaking and pulping. (2) After the slurry is dispersed, the slurry is poured into a buffer tank for slurry buffering; (3) Next, the slurry in the buffer tank is refined and then pumped into the refining tank; (4) Add composite additives to the refining tank at 4% of the dry pulp weight and stir for at least half an hour; (5) Next, add the waterproofing agent to the refining tank and continue stirring for at least half an hour; (6) After mixing, the slurry is transported to the thickening tank for subsequent dilution and use.

2. The preparation process for preventing chipping of pulp-forming products according to claim 1, characterized in that: The combination of long-fiber pulp and short-fiber pulp uses bamboo pulp and sugarcane pulp respectively, with the former added at 65% and 35% by weight.

3. The preparation process for preventing chipping of pulp-forming products according to claim 1, characterized in that: Soaking time should be at least half an hour, and the dispersing time should be at least ten minutes.

4. The preparation process for preventing chipping of pulp-forming products according to claim 1, characterized in that: The refining process uses three refining machines, and the refining current is controlled at 85A.

5. The preparation process for preventing chipping of pulp-forming products according to claim 1, characterized in that: The composite additive is selected from the following components: 28-30% fatty alcohol polyoxyethylene ether, 15-17% polyvinyl acetate, and 53-57% water.

6. The preparation process for preventing chipping of pulp-forming products according to claim 1, characterized in that: The amount of waterproofing agent added is 3.5% of the dry slurry weight.

7. A production line for preventing chipping of pulp-formed products, used to complete the preparation process for preventing chipping of pulp-formed products as described in any one of claims 1 to 6, characterized in that: The production line includes a pulper with a pulp tank. The pulp in the pulp tank is transferred to a buffer tank by a pulp pump to stabilize the pulp flow, optimize fiber quality, and balance production continuity. The pulp in the buffer tank is continuously refined by three refining machines and then pumped into the refining tank for the adjustment and stirring of relevant additives. After completion, it is transported to the thickening tank by a storage pump for subsequent dilution and use.

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