Parallel rainbow dust-free chalk and processing method thereof

Abstract

The invention belongs to the technical field of stationery, and provides parallel rainbow dust-free chalk and a processing method thereof. The chalk is formed by fixedly connecting at least two dust-free chalk units with different colors in parallel along the axial direction, and the cross section of a finished product is fan-shaped or distributed in parallel in a layered manner; each unit comprises 9-15 parts of a binder, 43-57 parts of a filler, 0.5-1.5 parts of a coloring agent, 4-6 parts of a moisture-proof lubricant and 25-35 parts of an emulsification dispersion medium. The processing method comprises the following steps: metering raw materials, preparing powder and a mixture in a color separation manner, pressing color strips in a color separation manner, combining the color strips in parallel, filling the color strips into a die, carrying out collaborative extrusion molding at 30-40 DEG C and 0.5-1.0 MPa, and carrying out post-treatment, wherein the mixture is rolled for not less than 2 times. Single-support multi-color writing is achieved, the color bar area is large if the color is small, use is convenient, multi-color lines with natural transition can be drawn at the same time if the color is large, and the drawing interest is improved; through the process of color separation pressing, combined die filling and collaborative extrusion, color unit interfaces are tightly attached, the structure is stable, the process is compatible with existing equipment, and industrial popularization is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of stationery technology, specifically relating to a parallel rainbow dustless chalk and its processing method. Background Technology

[0002] Currently, all dustless chalk on the market is single-color, and there are no rainbow chalk products that integrate multiple colors. In scenarios requiring multi-color expression, such as painting and blackboard writing, users need to frequently change different colors of single-color chalk, which is not only cumbersome and seriously affects creative or teaching efficiency, but also easily interrupts the creative process. At the same time, the color expression of single-color chalk is relatively limited and cannot meet people's needs for rich color combinations. Rainbow chalk, with its unique multi-color integrated design, can form a variety of color combinations, which can greatly enhance the fun and creativity of the drawing process and better adapt to the needs of painting, blackboard writing, and other scenarios. Therefore, developing a rainbow dustless chalk product that integrates multiple colors, is easy to use, and also makes drawing fun has become an urgent need in the current educational supplies industry. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of existing colored dustless chalk, such as inconvenience in use and limited color options due to its monochrome structure. It provides a parallel rainbow dustless chalk and its processing method. This chalk integrates multiple colored drawing strips into a single piece, allowing for the drawing of multi-colored lines or pictures. It not only achieves multi-color writing functionality with a single chalk but also boasts the advantage of low dust levels. Furthermore, its unique multi-color integrated design allows for diverse color combinations, greatly enhancing the fun and creativity of the drawing process. This better meets the needs of drawing creation, children's fun teaching, and other scenarios, thus satisfying the urgent demand in the educational supplies industry for rainbow dustless chalk products that integrate multiple colors, are easy to use, and offer drawing enjoyment.

[0004] The technical solution of the present invention is as follows:

[0005] In this invention, unless otherwise specified: the "coloring agent" is a pigment; the "binder" is stearic acid, sodium hydroxide, and sodium bentonite; the "filler" is calcium carbonate and talc; the "moisture-proof lubricant" is paraffin wax; and the "emulsifying dispersion medium" is water. Specifically, in the binder, stearic acid and sodium hydroxide constitute a reactive binder, and sodium bentonite constitutes an auxiliary binder.

[0006] A parallel rainbow dustless chalk is composed of at least two different colored dustless chalk units fixedly connected side-by-side along the axial direction. The dustless chalk units are distributed in a fan shape or in parallel layers across the cross-section of the chalk. Each dustless chalk unit comprises the following functional components: 9-15 parts by weight of binder, 43-57 parts by weight of filler, 0.5-1.5 parts by weight of colorant, 4-6 parts by weight of moisture-proof lubricant, and 25-35 parts by weight of emulsifying dispersion medium. The dustless chalk units of different colors achieve tight interfacial bonding through a molding process of "pre-assembly of colored stripes + co-extrusion," forming a structurally stable whole.

[0007] The corresponding processing method includes the following steps:

[0008] (1) Raw material measurement: Weigh the binder, moisture-proof lubricant, colorant, filler and emulsifying dispersion medium according to the weight parts, and weigh and store the colorant separately according to the color type.

[0009] (2) Color-separated powder preparation: For each color, the corresponding colorant, filler, binder (auxiliary binder) and emulsifying dispersion medium are added separately to the stirring device and stirred until they are evenly mixed to obtain a single-color powder.

[0010] (3) Color separation preparation of mixture: The binder (reactive binder) and moisture-proof lubricant are put into the dispersion device for emulsification to obtain an emulsion; the emulsion is divided into portions according to the color of the powder and added to the powder of different colors respectively. Each color of material is stirred separately to make the emulsion and powder blend together; then each color of mixture is rolled by rolling equipment at least twice to obtain a variety of qualified mixtures of different colors.

[0011] (4) Color-separated pressing of colored strips: Each color mixture is pressed into a single color strip. The cross-sectional shape of the single color strip is determined according to the number and distribution of colors in the cross-section of the finished product. When the cross-sectional color of the rainbow chalk finished product is distributed in a fan shape, the cross-sectional shape of the single color strip is adapted to the number of colors in the rainbow chalk. Specifically, when the number of colors is 2 or 4, the cross-section is rectangular, and when the number of colors is 3, 5, 6 or 7, the cross-section is circular. When the cross-sectional color of the rainbow chalk finished product is distributed in parallel layers, the cross-section of the single color strip is rectangular.

[0012] (5) Parallel combination and molding of colored stripes: Arrange at least two single-color stripes of different colors according to the distribution type of the cross-sectional color of the final product and fit them tightly together to form a combination and then put it into the mold of the molding machine; wherein, when the finished product is distributed in a fan shape, the single-color stripes are arranged according to the fan angle; when the finished product is distributed in parallel layers, the single-color stripes are stacked along the axial direction according to the preset layer order.

[0013] (6) Co-extrusion molding: Adjust the temperature and pressure inside the die of the molding machine. The temperature is controlled at 30~40℃ and the pressure is controlled at 0.5~1.0MPa. Co-extrude the combination into a multi-colored integral blank. After extruding the fan-shaped colored stripe combination, a blank with a fan-shaped cross-section is obtained. After extruding the parallel layered colored stripe combination, a blank with a parallel layered cross-section is obtained.

[0014] (7) Post-processing: Cut the blanks and solidify them to obtain parallel rainbow chalk finished products; wherein, after solidification, the blanks corresponding to the fan-shaped distribution combination are obtained with the cross-section of the colored stripes being evenly distributed in a fan shape, and the blanks corresponding to the parallel layered distribution combination are obtained with the cross-section of the colored stripes being parallel layered after solidification.

[0015] The present invention has the following significant advantages:

[0016] (1) Convenient and efficient to use: When there are fewer colors, the fan-shaped area or parallel layered area of ​​the corresponding colored strip is larger. While a single chalk integrates multiple colors, the writing contact area is more suitable for regular use needs. Multi-color writing or drawing can be achieved without frequent replacement, greatly improving the efficiency of use. It is especially suitable for teaching blackboard writing, children's drawing and other scenarios, avoiding interruption of the train of thought during pen replacement.

[0017] (2) Enhance painting effect and interest: When there are many colors, the multi-color strip structure with a fan-shaped cross section or parallel layered distribution can draw multi-color lines at the same time, enriching the painting expression, making the color transition more natural and the picture more layered, effectively enhancing the painting effect; the diverse and coherent color presentation can fully stimulate the user's painting interest, especially suitable for children's fun painting, creative graffiti and other scenarios.

[0018] (3) Stable product quality: By preparing mixed materials and pressing colored strips by color separation, the uniformity and color consistency of each color are achieved; after the colored strips are arranged side by side, they are extruded by a screw press, so that the interfaces of different color units are fully integrated and tightly attached, the structural stability is significantly improved, and they are not easy to break or separate during use; the optimization of the rolling process further improves the durability of the product.

[0019] (4) Strong process compatibility: The processing method is optimized based on the existing dustless chalk production process, without the need for large-scale modification of production equipment, which is convenient for industrial promotion. Attached Figure Description

[0020] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0021] The present invention will be further described in detail below through specific embodiments. These embodiments are merely descriptive and do not constitute a limitation on the scope of protection of the present invention.

[0022] Example 1

[0023] 1. Raw material ratio (by weight):

[0024] Red unit: 9 parts binder, 50 parts filler, 1 part red colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0025] Orange unit: 9 parts binder, 50 parts filler, 1 part orange colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0026] Yellow unit: 9 parts binder, 50 parts filler, 1 part yellow colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0027] Green Unit: 9 parts binder, 50 parts filler, 1 part green colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium;

[0028] Blue unit: 9 parts binder, 50 parts filler, 1 part blue colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0029] Indigo unit: 9 parts binder, 50 parts filler, 1 part indigo colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium;

[0030] Purple unit: 9 parts binder, 50 parts filler, 1 part purple colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium.

[0031] 2. Processing steps:

[0032] (1) Raw material measurement: Weigh the binder, moisture-proof lubricant, colorant, filler and emulsifying dispersion medium accurately according to the weight parts; weigh and store the colorant separately according to the required color type to complete the measurement and color separation of each functional component.

[0033] (2) Color-separated powder preparation: For each color, the corresponding colorant, filler, binder (auxiliary binder) and emulsifying dispersion medium are added separately to the stirring device and stirred until they are evenly mixed to obtain a single-color powder with uniform color and consistent composition.

[0034] (3) Color separation preparation of mixture: The binder (reactive binder) and moisture-proof lubricant are put into the dispersion device for emulsification to obtain a uniform emulsion; the emulsion is divided into portions according to the color of the powder and added to the powder of different colors respectively. Each color of material is stirred separately to fully integrate the emulsion and the powder; each color of mixture is rolled by rolling equipment at least twice to obtain a mixture of different colors.

[0035] (4) Color-separated pressing of colored strips: The qualified mixture of each color is fed into the pressing machine for pressing to obtain a single color strip with a circular cross-section, size that matches the subsequent extrusion mold, consistent length, and flat surface; the viscosity and thermoplastic range of each color strip are kept consistent.

[0036] (5) Parallel combination and molding of colored stripes: Seven different colored stripes are evenly arranged at a preset fan-shaped angle, with each stripe closely attached and without gaps, forming a stripe assembly with a fan-shaped cross-section; the stripe assembly is placed into the matching extrusion mold of the screw-type forming machine, and the position of the stripes is fixed by the positioning structure inside the mold.

[0037] (6) Co-extrusion molding: Adjust the temperature of the screw press to 30~40℃ and the pressure to 0.5~1.0MPa so that the colored strips in the mold enter a stable plastic flow state simultaneously; under the action of pressure, the colored strips are further closely attached along the mold cavity, maintaining a laminar flow state and forming a stable interface without mixing; through co-extrusion at the mold outlet, a long strip, uncured, seven-color integral blank with a fan-shaped cross-section is obtained.

[0038] (7) Post-processing: The extruded long strip of whole blank is cut directly into several small blanks of uniform specifications; the small blanks are sent to a dryer for drying or air drying to remove moisture from the material and complete solidification and shaping, and finally a seven-color parallel fan-shaped rainbow dustless chalk product with stable structure, clear color boundaries and uniform fan-shaped distribution of cross-section color stripes is obtained.

[0039] Example 2:

[0040] 1. Raw material ratio (by weight):

[0041] Red unit: 9 parts binder, 50 parts filler, 1 part red colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0042] Green Unit: 9 parts binder, 50 parts filler, 1 part green colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium;

[0043] 2. Processing steps:

[0044] (1) Raw material measurement: Weigh the binder, moisture-proof lubricant, colorant, filler and emulsifying dispersion medium accurately according to the weight parts; weigh and store the colorant separately according to the required color type to complete the measurement and color separation of each functional component.

[0045] (2) Color-separated powder preparation: For each color, the corresponding colorant, filler, binder (auxiliary binder) and emulsifying dispersion medium are added separately to the stirring device and stirred until they are evenly mixed to obtain a single-color powder with uniform color and consistent composition.

[0046] (3) Color separation preparation of mixture: The binder (reactive binder) and moisture-proof lubricant are put into the dispersion device for emulsification to obtain a uniform emulsion; the emulsion is divided into portions according to the color of the powder and added to the powder of different colors respectively. Each color of material is stirred separately to fully integrate the emulsion and the powder; each color of mixture is rolled by rolling equipment at least twice to obtain a mixture of different colors.

[0047] (4) Color-separated pressing of colored strips: The qualified mixture of each color is fed into the pressing machine for pressing to obtain a single color strip with a rectangular cross section, dimensions that match the subsequent extrusion mold, consistent length, and flat surface; the viscosity and thermoplastic range of each color strip are kept consistent.

[0048] (5) Parallel combination and mold assembly of colored stripes: Two different single-color stripes are evenly arranged at a preset fan-shaped angle, with each stripe closely attached and without gaps, forming a stripe assembly with a fan-shaped cross-section; the stripe assembly is placed into the matching extrusion mold of the screw-type forming machine, and the position of the stripes is fixed by the positioning structure inside the mold.

[0049] (6) Co-extrusion molding: Adjust the temperature of the screw press to 30~40℃ and the pressure to 0.5~1.0MPa so that the color strips in the mold enter a stable plastic flow state simultaneously; under the action of pressure, the color strips are further closely attached along the mold cavity, maintaining a laminar flow state and forming a stable interface without mixing; through co-extrusion at the mold outlet, a long strip, uncured, two-color integral blank with a fan-shaped cross-section is obtained.

[0050] (7) Post-processing: The extruded long strip of whole blank is cut directly to a preset length to obtain several small blanks of uniform specifications; the small blanks are sent to a dryer for drying or air drying to remove moisture from the material and complete solidification and shaping, and finally a two-color parallel fan-shaped rainbow dustless chalk product with stable structure, clear color boundaries and uniform fan-shaped distribution of cross-section color stripes is obtained.

[0051] Example 3

[0052] 1. Raw material ratio (by weight):

[0053] Red unit: 9 parts binder, 50 parts filler, 1 part red colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0054] Orange unit: 9 parts binder, 50 parts filler, 1 part orange colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0055] Yellow unit: 9 parts binder, 50 parts filler, 1 part yellow colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0056] Green Unit: 9 parts binder, 50 parts filler, 1 part green colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium;

[0057] Blue unit: 9 parts binder, 50 parts filler, 1 part blue colorant, 5 parts moisture-proof lubricant, 30 parts emulsifying dispersion medium;

[0058] Indigo unit: 9 parts binder, 50 parts filler, 1 part indigo colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium;

[0059] Purple unit: 9 parts binder, 50 parts filler, 1 part purple colorant, 5 parts moisture-proof lubricant, and 30 parts emulsifying dispersion medium.

[0060] 2. Processing steps:

[0061] (1) Raw material measurement: Weigh the binder, moisture-proof lubricant, colorant, filler and emulsifying dispersion medium accurately according to the weight parts; weigh and store the colorant separately according to the required color type to complete the measurement and color separation of each functional component.

[0062] (2) Color-separated powder preparation: For each color, the corresponding colorant, filler, binder (auxiliary binder) and emulsifying dispersion medium are added separately to the stirring device and stirred until they are evenly mixed to obtain a single-color powder with uniform color and consistent composition.

[0063] (3) Color separation preparation of mixture: The binder (reactive binder) and moisture-proof lubricant are put into the dispersion device for emulsification to obtain a uniform emulsion; the emulsion is divided into portions according to the color of the powder and added to the powder of different colors respectively. Each color of material is stirred separately to fully integrate the emulsion and the powder; each color of mixture is rolled by rolling equipment at least twice to obtain a mixture of different colors.

[0064] (4) Color-separated pressing of colored strips: The qualified mixture of each color is fed into the pressing machine for pressing to obtain a single color strip with a rectangular cross section, dimensions that match the subsequent extrusion mold, consistent length, and flat surface; the viscosity and thermoplastic range of each color strip are kept consistent.

[0065] (5) Parallel combination and molding of colored stripes: Seven different colored stripes are stacked and arranged along the axis in a preset layering order, with each stripe closely attached and without gaps, forming a stripe assembly with a parallel layered cross-section; the stripe assembly is placed into the matching extrusion mold of the screw-type forming machine, and the position of the stripes is fixed by the positioning structure inside the mold.

[0066] (6) Co-extrusion molding: Adjust the temperature of the screw press to 30~40℃ and the pressure to 0.5~1.0MPa so that the colored strips in the mold enter a stable plastic flow state simultaneously; under the action of pressure, the colored strips are further closely attached along the mold cavity, maintaining a laminar flow state and forming a stable interface without mixing; through co-extrusion at the mold outlet, a long strip, uncured, seven-color integral blank with parallel layered cross-section is obtained.

[0067] (7) Post-processing: The extruded long strip of whole blank is cut directly to a preset length to obtain several small blanks of uniform specifications; the small blanks are sent to a dryer for drying or air drying to remove moisture from the material and complete solidification and shaping, and finally a seven-color parallel parallel rainbow dustless chalk finished product with stable structure, clear color boundaries and parallel layered distribution of cross-section color stripes is obtained.

[0068] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A parallel rainbow dustless chalk, characterized in that: The chalk is formed by extruding at least two different colored dustless chalk units that are fixedly connected side-by-side along the axial direction. The dustless chalk units are distributed in a fan shape or in parallel layers on the cross-section of the chalk, and the interfaces between the different colored units are tightly bonded to form an integral structure. Each dustless chalk unit consists of the following functional components in parts by weight: 9-15 parts binder, 43-57 parts filler, 0.5-1.5 parts colorant, 4-6 parts moisture-proof lubricant, and 25-35 parts emulsifying dispersion medium. Furthermore, the colorants in the at least two different colored dustless chalk units are different from each other.

2. The processing method for parallel rainbow dustless chalk according to claim 1, characterized in that, Includes the following steps: Raw material measurement: Weigh each functional component according to the formula and separate the colorants according to color type; Color-separated powder preparation: For each color, the corresponding colorant, filler, binder (auxiliary binder) and emulsifying dispersion medium are mixed to prepare a single-color powder; Color-separated preparation of mixtures: After emulsifying the binder (reactive binder) and the moisture-proof lubricant, the mixtures are divided into parts according to color and mixed with powder of the corresponding color, and rolled to obtain mixtures of multiple colors; Color-separated pressed stripes: Each color mixture is pressed into a single color strip. The cross-sectional shape of the single color strip is determined according to the number and distribution of colors in the cross-section of the finished product. Color stripe assembly and molding: Arrange at least two single-color stripes of different colors in a fan-shaped angle or stack them along the axis and fit them tightly together to form an assembly, which is then loaded into the molding machine mold. Co-extrusion molding: The composite is co-extruded into a multi-colored integral preform at a temperature of 30-40℃ and a pressure of 0.5-1.0MPa; Post-processing: The blank is cut and cured to obtain the finished parallel rainbow chalk.

3. The processing method according to claim 2, characterized in that: When the cross-sectional color of the finished rainbow chalk is distributed in a fan shape, the cross-sectional shape of the single-color strips obtained in the color separation and pressing step is adapted to the number of rainbow chalk colors. Specifically, when the number of rainbow chalk colors is 2 or 4, the cross-section of the single-color strip is rectangular; when the number of rainbow chalk colors is 3, 5, 6 or 7, the cross-section of the single-color strip is circular. In the strip assembly and molding step, the single-color strips are arranged in a fan-shaped angle to form an assembly.

4. The processing method according to claim 2, characterized in that: When the cross-sectional color of the finished rainbow chalk is distributed in parallel layers, the cross-section of the single-color strips produced in the color separation and pressing step is rectangular; in the strip assembly and molding step, the single-color strips are stacked and arranged along the axis in a preset layering order to form an assembly with a cross-section that is distributed in parallel layers.

5. The processing method according to claim 2, characterized in that: In the step of preparing the color mixture, each color mixture is rolled at least twice.

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