A method for dyeing pulp molded products that saves dye usage

Abstract

The present invention provides a method for dyeing pulp molded products that saves dye usage, comprising the following steps: Step 1: Heating ambient temperature water to 40-90°C in a heating water tank; Step 2: Adding the hot water, raw pulp, and dye to a pulper; Step 3: The pulper breaks up the pulp and dyes it; Step 4: Sending the dyed liquid slurry to a molding machine for production. The present invention aims to provide a method for dyeing pulp molded products that achieves good dyeing results and is environmentally friendly, saves dye usage, and reduces dye usage.

Description

Technical Field

[0001] The invention relates to the technical field of pulp molded product production, in particular to a pulp molded product dyeing method that saves dye usage. Background Art

[0002] Pulp molding is a three-dimensional papermaking technology. It uses waste paper as raw material, shaping paper products into specific shapes using specialized molds on a molding machine. Pulp molding, in addition to making lunch boxes and tableware, is also increasingly used for industrial cushioning packaging, and is experiencing rapid growth. In recent years, with the increasing demand for manufacturing products, particularly packaging, paper-based plastics are gradually replacing plastics. The diverse color requirements for paper-based plastics necessitate dyeing during the pulping process to meet the diverse color requirements of different customers.

[0003] Directly using tap water or recycled water pulp for dyeing during the production of paper-plastic products has the following disadvantages:

[0004] 1. It requires more dyes, dyeing auxiliaries and fixing agents;

[0005] 2. The dyeing effect will also be affected by the environment and water temperature, and the color fluctuates greatly;

[0006] 3. The color fixing effect is poor. Summary of the Invention

[0007] Therefore, the present invention aims to solve the problems in the prior art of pulp molded products such as large amounts of dyeing materials, large fluctuations in dyeing effects, and poor color fixing effects.

[0008] To this end, the technical solution adopted is that the present invention provides a method for dyeing pulp molded products that saves dye usage, comprising the following steps:

[0009] Step 1: Heat the room temperature water to 40-90℃ using a heating water tank;

[0010] Step 2: adding hot water, raw material pulp, and dye into a pulper;

[0011] Step 3: The pulper breaks up the pulp and dyes it;

[0012] Step 4: Send the dyed liquid slurry to the molding machine for production.

[0013] Preferably, in step 1,

[0014] The heating water tank adopts the circulating heating mode of electric heating tube.

[0015] Preferably, in step 1,

[0016] A plurality of temperature sensors are arranged in the heating water tank.

[0017] Preferably, in step 2,

[0018] The dye is toner.

[0019] Preferably, in step 2,

[0020] Add dyeing aid and fixing agent into the pulper in sequence.

[0021] Preferably, in step 3,

[0022] The pulper is used to stir and mix the slurry through a stirring mechanism.

[0023] Preferably, the stirring speed of the stirring mechanism is 1000-2000 rpm, and the stirring time of the stirring mechanism is 30-40 min.

[0024] Preferably, in step 3,

[0025] The slurry is dyed at a dyeing temperature of 40-90°C for 20-30 minutes.

[0026] Preferably, in step 4,

[0027] The molding machine dehydrates and molds the dyed liquid slurry to form a wet blank.

[0028] Preferably, the wet blank of the product is made into a molded product by hot pressing and drying.

[0029] The technical solution of the present invention has the following advantages:

[0030] 1. The present invention saves more than 25% of dyes and more than 10% of auxiliary dyes and fixing agents;

[0031] 2. The present invention can stabilize the dyeing effect, and the dyeing of pulp molded products is not affected by the environment and water temperature;

[0032] 3. The present invention can improve the color fixing effect of pulp molded products. After abrasion resistance testing, according to the AATCC six-color nine-level color chart, the color can be improved from level 3 to level 4.5.

[0033] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0034] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a physical diagram of the prior art of the present invention;

[0038] Figure 3 Schematic diagram of the structure of the stirring device of the present invention;

[0039] Figure 4 This is an enlarged view of the stirring device A of the present invention;

[0040] Among them, 1-liquid storage tank, 2-dual output shaft motor, 3-transmission box, 4-cam, 5-driving gear, 6-rotating ring, 7-transmission rod, 8-driven gear, 9-first rotating plate, 10-first stirring rod, 11-first spring, 12-guide rod, 13-second rotating plate, 14-second stirring rod, 15-second spring, 16-stirring plate. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0042] It should be noted that when a component is referred to as being “fixed to” or “disposed on” another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being “connected to” another component, it can be directly or indirectly connected to the other component.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, and therefore cannot be understood as limiting the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0045] The embodiment of the present invention provides a method for dyeing pulp molded products with reduced dye usage, such as Figure 1-2 As shown, the following steps are included:

[0046] Step 1: Heat the room temperature water to 40-90℃ using a heating water tank;

[0047] Step 2: adding hot water, raw material pulp, and dye into a pulper;

[0048] Step 3: The pulper breaks up the pulp and dyes it;

[0049] Step 4: Send the dyed liquid slurry to the molding machine for production.

[0050] The working principle of the above technical solution is: tap water is injected into the heating water tank through a water pipe, the heating water tank heats the tap water to 40-90°C, hot water of appropriate temperature, raw material pulp, and dye are added to the pulper in sequence, and the adding order can be adjusted. The pulper is started, the pulper breaks up the raw material pulp, the hot water, pulp, and dye are fully mixed and stirred, the dye liquid dyes the pulp, and the dyed pulp is sent to the molding machine for molding and drying to finally make a molded product.

[0051] The beneficial effects of the above technical solution are:

[0052] 1. The present invention saves more than 25% of dyes and more than 10% of auxiliary dyes and fixing agents;

[0053] 2. The present invention can stabilize the dyeing effect, and the dyeing of pulp molded products is not affected by the environment and water temperature;

[0054] 3. The present invention can improve the color fixing effect of pulp molded products. After abrasion resistance testing, according to the AATCC six-color nine-level color chart, the color can be improved from level 3 to level 4.5.

[0055] In one embodiment, in step 1,

[0056] The heating water tank adopts the circulating heating mode of electric heating tube.

[0057] The working principle and beneficial effects of the above technical solution are: the water in the water tank is circulated and heated through multiple heating pipes, thereby improving the heating efficiency of room temperature water, ensuring uniform heating of room temperature water, and ensuring the production quality of pulp molded products.

[0058] In one embodiment, in step 1,

[0059] A plurality of temperature sensors are arranged in the heating water tank.

[0060] The working principle and beneficial effects of the above technical solution are: multiple temperature sensors monitor the water temperature in the heating water tank in real time, and adjust the power of the electric heating pipe according to the monitoring situation to ensure that the hot water supplied to the pulper always meets the requirements.

[0061] In one embodiment, in step 2,

[0062] The dye is toner.

[0063] The working principle and beneficial effects of the above technical solution are as follows: the powdered dye is easy to store, easy to mix in hot water, convenient to mix with the raw material pulp, and dye the pulp to achieve a good white effect.

[0064] In one embodiment, in step 2,

[0065] Add dyeing aid and fixing agent into the pulper in sequence.

[0066] The working principle and beneficial effects of the above technical solution are as follows: the dyeing auxiliary agent is used to improve the dyeing efficiency and dyeing quality of the pulp, and the fixing agent is used to ensure the uniformity of the pulp dyeing, prevent the pulp molded products from fading or uneven color, and ensure the production quality of the pulp molded products.

[0067] In one embodiment, in step 3,

[0068] In the pulper, the pulp is broken up and mixed by a plurality of staggered rotating augers.

[0069] The working principle and beneficial effects of the above technical solution are as follows: a number of staggered rotating augers stir the hot water, raw material pulp and dye added to the pulper, fully crush the raw material pulp, ensure that the three are fully mixed, and facilitate pulp dyeing.

[0070] In one embodiment, the rotation speed of the rotary auger is 1000-2000 rpm, and the crushing and mixing time of the rotary auger is 30-40 min.

[0071] The working principle and beneficial effects of the above technical solution are: the rotary auger rotates and stirs at high speed for a long time, so that the raw material pulp is completely broken down, the dye and pulp are fully mixed, the pulp dyeing efficiency is improved, and the dyeing effect is improved.

[0072] In one embodiment, in step 3,

[0073] The slurry is dyed at a dyeing temperature of 40-90°C for 20-30 minutes.

[0074] The working principle and beneficial effects of the above technical solution are: the slurry is always in a high temperature environment, the slurry is fully dyed, the dyeing effect is stable, the color fixing effect is good, it is not easy to decolorize, and the slurry is evenly dyed.

[0075] In one embodiment, in step 4,

[0076] The molding machine dehydrates and molds the dyed liquid slurry to form a wet blank.

[0077] The working principle and beneficial effects of the above technical solution are as follows: the dyed liquid slurry is fed into the forming mold, the forming machine vacuum dehydrates the semi-finished wet blank, the forming machine extrude the semi-finished wet blank, and secondary dehydration is performed to form a preform. The product wet blank has a high dehydration rate, and the production is convenient and efficient.

[0078] In one embodiment, the wet product is dried by hot pressing to form a molded product.

[0079] The working principle and beneficial effects of the above technical solution are as follows: the prepared wet blank of the product is fed into a hot pressing and drying mold, and the hot pressing and drying mold extrude the wet blank of the product at a temperature of 100°C, dries and shapes the wet blank of the product to make a pulp molded product.

[0080] In one embodiment, after the molded products are manufactured, the product colors are inspected, and qualified products are trimmed and packaged.

[0081] The working principle and beneficial effects of the above technical solution are: the pulp molded products are inspected in all directions, the qualified products are trimmed and cut, and then packaged for the next step of processing, and the unqualified products are recycled.

[0082] In one embodiment, in step 4,

[0083] The liquid slurry after dyeing is stored and transported through the liquid storage tank 1, and the liquid slurry is sent to the molding machine for production through the liquid storage tank 1.

[0084] The working principle and beneficial effects of the above technical solution are as follows: when pulp molded products are produced on a large scale, the pulping mechanism takes out a large amount of dyed liquid slurry, uses the liquid storage tank 1 to store the dyed liquid slurry, and according to the production requirements of the molding machine, the dyed liquid slurry is transported to different molding machines for production through the liquid storage tank 1.

[0085] In one embodiment, Figure 3-4As shown, a stirring device is provided in the liquid storage tank 1, and the stirring device comprises: a dual-output shaft motor 2, a transmission box 3, a cam 4, and a driving gear 5.

[0086] A vertical rotating ring 6 is rotatably connected to the inner wall of the top of the liquid storage tank 1, and a transmission box 3 is provided in the rotating ring 6. A dual-output shaft motor 2 is provided on the inner wall of one side of the transmission box 3, and the output shaft of one end of the dual-output shaft motor 2 passes through the side wall of the transmission box 3 and the axis of the cam 4 in sequence and is connected to the first rotating plate 9. The output shaft of the dual-output shaft motor 2 is rotatably connected to the side wall of the transmission box 3, and the output shaft of the dual-output shaft motor 2 is connected to the cam 4. A plurality of first stirring rods 10 are arranged at intervals on the circumferential outer wall of the first rotating plate 9. A driving gear 5 is provided on the output shaft of the other end of the dual-output shaft motor 2, and a transmission rod 7 is rotatably connected to the other three side walls of the transmission box 3. A driven gear 8 is provided at one end of the transmission rod 7. The driven gears 8 on both sides of the driving gear 5 are respectively meshed with the driving gear 5, and the driven gears 8 opposite to the driving gear 5 are respectively meshed with the driven gears 8 on both sides. The other end of the transmission rod 7 extends out of the transmission box 3;

[0087] The other end of the transmission rod 7 passes through the axis of the cam 4 and is connected to the first rotating plate 9, the transmission rod 7 is connected to the cam 4, and a plurality of first stirring rods 10 are arranged at intervals on the circumferential outer wall of the first rotating plate 9; a first spring 11 in a vertical direction is provided above the transmission box 3, the bottom end of the first spring 11 is connected to the transmission box 3, the top of the first spring 11 is connected to the inner wall of the top end of the rotating ring 6, and a guide rod 12 in a vertical direction is provided below the transmission box 3, the top end of the guide rod 12 is connected to the transmission box 3, the bottom end of the guide rod 12 passes through the rotating ring 6 and is connected to the second rotating plate 13, and a plurality of second stirring rods 14 are arranged at intervals on the circumferential outer wall of the second rotating plate 13, the guide rod 12 is slidably connected to the rotating ring 6, a second spring 15 is sleeved on the guide rod 12, the top end of the second spring 15 is connected to the transmission box 3, the bottom end of the second spring 15 is connected to the inner wall of the bottom end of the rotating ring 6, and stirring plates 16 are respectively provided on the outer walls of both sides of the rotating ring 6.

[0088] The working principle and beneficial effects of the above technical solution are as follows: when the liquid storage tank 1 stores or transports the dyed liquid slurry to the molding machine, the dual-output shaft motor 2 is started to drive the driving gear 5 to rotate, and the cam 4, the first rotating plate 9, and the first stirring rod 10 are driven to rotate. The driven gears 8 on both sides of the driving gear 5 are driven to rotate through the gear meshing transmission between the driving gear 5 and the driven gear 8. The driven gear 8 opposite to the driving gear 5 is driven to rotate through the gear meshing transmission between the driven gear 8 and the driven gear 8. The driven gear 8 drives the transmission rod 7 connected to it to rotate, and the transmission rod 7 drives the cam 4, the first rotating plate 9, and the first stirring rod 10 thereon to rotate. The rotation of the four cams 4 The transmission box 3 is driven to reciprocate up and down, and the rotation direction of the two cams 4 on the same axis is opposite to the rotation direction of the two cams 4 on the other axis, driving the transmission box 3 to swing back and forth. Through the composite superposition of motion, the transmission box 3 swings and reciprocates up and down, driving the first stirring rod 10 to swing and reciprocate up and down. Through the composite superposition of motion, the first stirring rod 10 rotates and swings while reciprocating up and down. The first stirring rod 10 stirs the liquid slurry in the liquid storage tank 1, ensuring that the liquid slurry is always in motion, ensuring that the liquid slurry is always mixed evenly, preventing the liquid slurry from being separated due to environmental factors such as too long time or external temperature during storage and transportation, and ensuring The dyeing and fixing effect of the liquid slurry is improved, and the production quality of pulp molded products is improved; the transmission box 3 drives the guide rod 12 to swing and reciprocate up and down. When the guide rod 12 moves upward, the first spring 11 compresses the second spring 15 and stretches it. When the guide rod 12 moves downward, the first spring 11 stretches the second spring 15 and compresses it. The guide rod 12 drives the second rotating plate 13 and the second stirring rod 14 to swing and reciprocate up and down. The second stirring rod 14 stirs the liquid slurry. The second stirring rod 14 transports the liquid slurry at the bottom of the liquid storage tank 1 to the upper layer, avoiding the liquid slurry from being stored for too long or precipitated due to external factors, resulting in uneven mixing of the liquid slurry, thereby improving the pulp The consistency of the quality of the molded products; the second stirring rod 14 transports the bottom liquid slurry to the upper layer, the first stirring rod 10 stirs the bottom liquid slurry, and relays the bottom liquid slurry to the top layer, so that the liquid slurry in the liquid storage tank 1 flows vertically, ensuring the mixing effect of the liquid slurry, stabilizing the dyeing effect of the liquid slurry, and improving the dyeing effect of the pulp molded product; the guide rod 12 drives the rotating ring 6 and the stirring plate 16 to swing back and forth, and the stirring plate 16 stirs the liquid slurry, so that the liquid slurry flows circumferentially, and the multi-directional flow of the liquid slurry avoids the liquid slurry from solidifying due to long-term storage, reduces the waste of liquid slurry, improves the utilization rate of liquid slurry, and reduces the production cost of pulp molded products.

[0089] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for dyeing pulp molded products that saves dye usage, characterized in that: The steps include: Step 1: Heat the room temperature water to 40-90℃ using a heating water tank; Step 2: adding hot water, raw material pulp, and dye into a pulper; Step 3: The pulper breaks up the pulp and dyes it; Step 4: Send the dyed liquid slurry to the molding machine for production; In step 4, the liquid slurry after dyeing is stored and transported through the liquid storage tank, and the liquid slurry is sent to the molding machine for production through the liquid storage tank; A stirring device is provided in the liquid storage tank, and the stirring device includes: a rotating ring rotatably connected to the inner wall of the top end of the liquid storage tank, a transmission box is provided in the rotating ring, a dual-output shaft motor is provided on the inner wall of one side of the transmission box, the output shaft at one end of the dual-output shaft motor passes through the side wall of the transmission box and is connected to the cam and the first rotating plate, the output shaft at the other end of the dual-output shaft motor is provided with a driving gear, and transmission rods are rotatably connected on the other three side walls of the transmission box, one end of the transmission rod is provided with a driven gear, the driven gears on both sides of the driving gear are respectively meshed with the driving gear, and the driven gears opposite to the driving gear are respectively meshed with the driven gears on both sides, the other end of the transmission rod extends out of the transmission box, the transmission rod passes through the cam and is connected to the first rotating plate, and a plurality of first stirring rods are spaced apart on the circumferential outer wall of the first rotating plate; A first spring in a vertical direction is provided above the transmission box, the bottom end of the first spring is connected to the transmission box, the top end of the first spring is connected to the inner wall of the top end of the rotating ring, a guide rod in a vertical direction is provided below the transmission box, the top end of the guide rod is connected to the transmission box, the bottom end of the guide rod passes through the rotating ring and is connected to the second rotating plate, and a plurality of second stirring rods are provided at intervals on the circumferential outer wall of the second rotating plate; The guide rod is slidably connected to the rotating ring, a second spring is sleeved on the guide rod, the top of the second spring is connected to the transmission box, the bottom of the second spring is connected to the inner wall of the bottom end of the rotating ring, and stirring plates are respectively provided on the outer walls of both sides of the rotating ring.

2. A method for dyeing pulp molded products that saves dye usage according to claim 1, characterized in that: In the step 1, The heating water tank adopts the circulating heating mode of electric heating tube.

3. The method for dyeing pulp molded products according to claim 1, wherein: In the step 1, A plurality of temperature sensors are arranged in the heating water tank.

4. A method for dyeing pulp molded products that saves dye usage as claimed in claim 1, characterized in that: In the step 2, The dye is toner.

5. The method for dyeing pulp molded products according to claim 1, wherein: In the step 2, Add dyeing aid and fixing agent into the pulper in sequence.

6. The method for dyeing pulp molded products according to claim 1, wherein: In step 3, In the pulper, the pulp is broken up and mixed by a plurality of staggered rotating augers.

7. A method for dyeing pulp molded products that saves dye usage as claimed in claim 6, characterized in that: The rotation speed of the rotary auger is 1000-2000 rpm, and the crushing and mixing time of the rotary auger is 30-40 min.

8. The method for dyeing pulp molded products according to claim 1, wherein: In step 3, The slurry is dyed at a dyeing temperature of 40-90°C for 20-30 minutes.

9. The method for dyeing pulp molded products according to claim 1, wherein: In the step 4, The molding machine dehydrates and molds the dyed liquid slurry to form a wet blank.

10. A method for dyeing pulp molded products that saves dye usage according to claim 9, characterized in that: The wet product is dried by hot pressing to form a molded product.

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