Resin color pen and preparation method thereof

Abstract

The invention provides a resin color pen and a preparation method thereof, and belongs to the technical field of pen production. The preparation method of the resin color pen comprises the following steps: (1) mixing materials of the resin color pen; (2) granulating the mixed material of the resin color pen; (3) extruding a resin color pen blank; (4) vacuum setting; (5) water cooling; and (6) cutting. By adopting the thermoplastic extrusion integrated forming process and the special-shaped forming mold, the resin color pen with the cross section of the hollow structure can be manufactured, the preparation steps of the resin color pen can be simplified, operation is easy and convenient, the process is simple, the production efficiency is improved, and production materials can be effectively saved.

Description

Technical Field

[0001] The present invention relates to the field of pen production, and in particular to a resin colored pen and a preparation method thereof. Background Art

[0002] Pencils are commonly used cultural and learning supplies in life, usually used for writing or drawing. Generally, pencils usually include an inner lead core and an outer wooden rod that wraps the lead core. As an example, the lead core of a related pencil mainly includes coloring materials, adhesives, and clay, etc. The outer layer of the pencil is wrapped by a wooden rod, and the surface needs to be painted.

[0003] In the process of realizing the concept of the present disclosure, the inventors found that the relevant pencil production process has technical problems such as complicated production process, high manufacturing cost, low production efficiency, and high cost of materials required for production. Summary of the invention

[0004] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides a resin colored pen and a preparation method thereof.

[0005] According to an embodiment of one aspect of the present disclosure, a method for preparing a resin colored pen is provided, comprising: (1) mixing resin colored pen materials: mixing 20-40 parts by weight of a thermoplastic main material, 10-20 parts by weight of stearic acid, 20-40 parts by weight of paraffin wax, 2-5 parts by weight of a thermoplastic elastomer, 5-10 parts by weight of a coloring material, and 20-40 parts by weight of talcum powder to obtain a resin colored pen mixed material, wherein the thermoplastic main material is selected from any one of the following: polyethylene, polystyrene, or a copolymer of acrylonitrile, butadiene, and styrene; (2) granulating the resin colored pen mixed material: granulating the resin obtained in step (1) The color pen mixed material is granulated to prepare resin color pen granules; (3) extruding the resin color pen blank: heating and melting the resin color pen granules obtained in step (2) to form a molten material, and passing the molten material through a special-shaped forming die to extrude a resin color pen blank with a hollow cross-section structure based on a thermoplastic extrusion process; (4) vacuum shaping: vacuum shaping the resin color pen blank obtained in step (3); (5) water cooling: pulling out the vacuum-shaped resin color pen blank and cooling it; (6) cutting: cutting the cooled resin color pen blank to obtain a resin color pen with a hollow cross-section structure.

[0006] According to an embodiment of another aspect of the present disclosure, a resin colored pen is provided, which is manufactured by the method described above. The resin colored pen is integrally formed, and the cross-section of the resin colored pen is a hollow structure.

[0007] According to the embodiments of the present disclosure, the materials used to prepare the resin colored pens in the method of the embodiments of the present disclosure include thermoplastic main body materials, stearic acid, paraffin, thermoplastic elastomers and talcum powder, and these materials can be well applied to the processing technology of thermoplastic extrusion to realize the one-piece molding of the resin colored pens. Compared with other preparation methods such as injection molding and blow molding, the thermoplastic extrusion process can realize continuous production, has the advantages of simple operation, low equipment investment and production cost, high production efficiency, and is more suitable for manufacturing long and continuous products, such as pencils and drawing sticks. It can be understood that through the aforementioned resin colored pen materials, it is possible to realize the continuous and efficient production of one-piece resin colored pens with a hollow cross-section based on the thermoplastic extrusion process, thereby effectively simplifying the preparation steps of the resin colored pens, and having the advantages of simple operation, simple process, high production efficiency, material saving, and low production cost. Therefore, the disclosed embodiment can produce resin colored pens with a hollow structure in cross section by adopting a thermoplastic extrusion integrated molding process and a special-shaped molding mold, which can simplify the preparation steps of the resin colored pens, is easy to operate, has a simple process, improves production efficiency, and can effectively save production materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0009] Figure 1 A resin colored pen according to an embodiment of the present disclosure is schematically shown;

[0010] Figure 2 Schematically shows a cross section of a resin colored pen according to an embodiment of the present disclosure;

[0011] Figure 3 Schematically shows a cross section of a resin colored pen according to another embodiment of the present disclosure;

[0012] Figure 4 The cross section of a resin colored pen according to some embodiments of the present disclosure is exemplarily shown. DETAILED DESCRIPTION

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0014] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0015] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0016] Pencils are commonly used cultural and learning supplies in life, usually used for writing or drawing. Generally, pencils usually include an inner lead core and an outer wooden rod that wraps the lead core. As an example, the lead core of a related pencil mainly includes coloring materials, adhesives, and clay, etc. The outer layer of the pencil is wrapped by a wooden rod, and the surface needs to be painted.

[0017] In the process of realizing the concept of the present disclosure, the inventors found that the relevant pencil production process has technical problems such as complicated production process, high manufacturing cost, low production efficiency, and high cost of materials required for production.

[0018] Specifically, according to one aspect of the embodiments of the present disclosure, a method for preparing a resin colored pen is provided, comprising the following steps:

[0019] (1) Mixing resin colored pen materials: Mixing 20-40 parts by weight of a thermoplastic main material, 10-20 parts by weight of stearic acid, 20-40 parts by weight of paraffin wax, 2-5 parts by weight of a thermoplastic elastomer, 5-10 parts by weight of a coloring material, and 20-40 parts by weight of talcum powder to obtain a resin colored pen mixed material, wherein the thermoplastic main material is selected from any one of the following: polyethylene, polystyrene, or a copolymer of acrylonitrile, butadiene, and styrene;

[0020] (2) Granulating the resin colored pen mixed material: Granulating the resin colored pen mixed material obtained in step (1) to prepare resin colored pen granular material;

[0021] (3) extruding a resin colored pen blank: heating and melting the resin colored pen granules obtained in step (2) to form a molten material, passing the molten material through a special-shaped forming die, and extruding a resin colored pen blank with a hollow cross-section based on a thermoplastic extrusion process;

[0022] (4) vacuum shaping: vacuum shaping the resin colored pen blank obtained in step (3);

[0023] (5) Water cooling: Pull out the vacuum-formed resin color pen blank and cool it;

[0024] (6) Cutting: Cutting the cooled resin colored pen blank to obtain a resin colored pen with a hollow structure in cross section.

[0025] According to an embodiment of the present disclosure, acrylonitrile, butadiene and styrene terpolymer (AcrylonitrileButadieneStyrene plastic) may be referred to as ABS resin.

[0026] As an example, the thermoplastic main material can be selected as, in parts by weight: 20 parts of polyethylene, 25 parts of polyethylene, 30 parts of polyethylene, 35 parts of polyethylene, 40 parts of polyethylene, 20 parts of polystyrene, 25 parts of polystyrene, 30 parts of polystyrene, 35 parts of polystyrene, 40 parts of polystyrene, 20 parts of ABS resin, 25 parts of ABS resin, 30 parts of ABS resin, 35 parts of ABS resin or 40 parts of ABS resin.

[0027] As another example, the thermoplastic main body material may be selected, for example, in parts by weight: 20 parts polyethylene + 20 parts polystyrene, 25 parts polyethylene + 15 parts polystyrene, or 30 parts polyethylene + 10 parts polystyrene.

[0028] According to one embodiment of the present disclosure, stearic acid can be selected as 10 parts, 15 parts or 20 parts by weight, for example. Paraffin can be selected as 20 parts, 25 parts, 30 parts, 35 parts or 40 parts by weight, for example. Thermoplastic elastomer can be selected as 2 parts, 3 parts, 4 parts or 5 parts by weight, for example. Talc can be selected as 20 parts, 25 parts, 30 parts, 35 parts or 40 parts by weight.

[0029] According to the embodiments of the present disclosure, in the preparation process of the above-mentioned resin colored pens, the thermoplastic main material has thermoplasticity and can play the role of a matrix material in the thermoplastic extrusion process, and it can provide the basic physical properties required for the resin colored pens, such as flexibility and strength. Thermoplastic elastomers can provide additional flexibility and elasticity in the thermoplastic extrusion process, which helps to improve the writing performance and durability of the resin colored pens. Stearic acid and paraffin can be used as lubricants to improve the fluidity of the molten material, increase the gloss of the molten material surface, reduce the friction between the materials and between the materials and the processing equipment surface, and avoid the adhesion of the materials to the processing equipment. Coloring materials can be used to enable the resin colored pens to be colored, provide the color of the resin colored pens and the color depth when writing. Talcum powder can be used as a filler to improve the molding and processing performance of the resin colored pens, reduce the amount of production materials used, and reduce production costs.

[0030] According to the embodiments of the present disclosure, thermoplastic elastomer (TPE or TPR for short), also known as artificial rubber or synthetic rubber. Thermoplastic elastomer has the excellent properties of high elasticity, aging resistance, and oil resistance of traditional cross-linked vulcanized rubber, and at the same time has the characteristics of convenient processing and wide processing methods of ordinary plastics, and can be applied to processing technologies such as extrusion molding, injection molding, and blow molding.

[0031] According to the embodiments of the present disclosure, the colors of the resin colored pen can include black, white, red, orange, yellow, green, cyan, blue, purple, etc., which are not limited here. For example, different colors of resin colored pens can be prepared by selecting different coloring materials.

[0032] According to the embodiments of the present disclosure, the coloring material can be used as the coloring component of the resin colored pen, and it can be matched in a variety of formulas according to actual needs. For example, the matched coloring material can be mixed with 30 parts of polyethylene, 15 parts of stearic acid, 30 parts of paraffin, 3 parts of thermoplastic elastomer, and 30 parts of talcum powder by weight, and finally resin colored pens of different colors can be made by adopting the above preparation method.

[0033] As an example, when selecting the coloring material for a black resin colored pen, for example, 8-10 parts by weight of carbon black may be selected, for example, 8 parts, 9 parts or 10 parts of carbon black may be selected.

[0034] As another example, when selecting coloring materials for green resin colored pens, for example, 2019 Light Fast Yellow G: 4-7 parts, 4382 Phthalocyanine Blue BGS: 1-2 parts, and carbon black: 0.03-0.05 parts can be selected by weight. For example, 2019 Light Fast Yellow G can be 4 parts, 5 parts, 6 parts or 7 parts, 4382 Phthalocyanine Blue BGS can be 1 part or 2 parts, and carbon black can be 0.03 parts, 0.04 parts or 0.05 parts.

[0035] As another example, when selecting coloring materials for a red resin colored pen, for example, 4129 Permanent Red FGR: 5-7 parts by weight can be selected, for example, 4129 Permanent Red FGR can be 5 parts, 6 parts or 7 parts.

[0036] It should be noted that the coloring materials and their proportions required for color pencils of different colors are well known to those skilled in the art and will not be described in detail here.

[0037] According to one embodiment of the present disclosure, the resin colored pen mixture obtained in step (1) can be fed into a screw extruder granulator, which heats the resin colored pen mixture, melts it, and then extrude and cool it to make resin colored pen granules.

[0038] According to the embodiments of the present disclosure, the resin colored pen granules can be heated and melted to form a molten material, and the molten material can be passed through a special-shaped forming die to extrude a resin colored pen blank having a hollow cross-section structure based on a thermoplastic extrusion process.

[0039] According to the embodiments of the present disclosure, the thermoplastic extrusion process is an efficient, continuous, and low-cost molding method. For example, the thermoplastic extrusion process can use the extrusion effect of a screw or a plunger to allow the heat-melted polymer material to be pushed by pressure through a die head to be formed into a continuous profile with a constant cross-section.

[0040] Specifically in the embodiments of the present disclosure, for example, the resin colored pen particles can be plasticized by the extrusion action of a screw or a plunger to form a molten material while being pushed forward, and the molten material continuously passes through a special-shaped forming die to extrude a resin colored pen blank with a hollow cross-section.

[0041] According to the embodiments of the present disclosure, the obtained resin color pen blank with a hollow structure in cross section can be vacuum-formed to ensure the molding quality of the hollow structure. The vacuum-formed resin color pen blank can be pulled out and cooled, and the cooled resin color pen blank can be cut to obtain a resin color pen with a hollow structure in cross section.

[0042] According to the embodiments of the present disclosure, a resin colored pen blank with a hollow cross-section structure can be extruded through a special-shaped forming die, and then a resin colored pen with a hollow cross-section structure can be made, thereby effectively saving materials and reducing the material cost required for production. It is understandable that in order to facilitate writing and drawing, colored pens usually need to be rolled when used, and the rolled parts are difficult to be reused, which will cause waste of colored pen materials. When using the colored pen with a hollow cross-section structure according to the embodiments of the present disclosure, since the hollow structure reduces the material consumption of the resin colored pen, the amount of material wasted when rolling the resin colored pen can also be reduced, thereby having better economy.

[0043] According to the embodiments of the present disclosure, the materials used to prepare the resin colored pens in the method of the embodiments of the present disclosure include a thermoplastic main material, stearic acid, paraffin, a thermoplastic elastomer and talcum powder, and these materials can be well adapted to the processing technology of thermoplastic extrusion to realize the one-piece molding of the resin colored pens. Compared with other preparation methods such as injection molding and blow molding, the thermoplastic extrusion process can realize continuous production, and has the advantages of simple operation, low equipment investment and production cost, high production efficiency, and is more suitable for manufacturing long and continuous shaped products, such as pencils and drawing sticks. It can be understood that through the aforementioned resin colored pen material, it is possible to realize the continuous and efficient production of an one-piece resin colored pen with a hollow structure in cross section based on the thermoplastic extrusion process, thereby effectively simplifying the preparation steps of the resin colored pens, and having the advantages of simple operation, simple process, high production efficiency, material saving, and low production cost. Therefore, the disclosed embodiment can produce resin colored pens with a hollow structure in cross section by adopting a thermoplastic extrusion integrated molding process and a special-shaped molding mold, which can simplify the preparation steps of the resin colored pens, is easy to operate, has a simple process, improves production efficiency, and can effectively save production materials.

[0044] It should be noted that the method for preparing the resin colored pen provided in the embodiment of the present disclosure can be used to prepare pencils for writing, and can also be used to prepare drawing sticks for painting, and is not limited here.

[0045] According to an embodiment of the present disclosure, step (3) includes: adding resin colored pen granules to a screw extruder, the resin colored pen granules pass through the melting and heating chamber of the screw extruder to form a molten material, the molten material is sheared and extruded by the screw of the screw extruder into a special-shaped forming mold, and a resin colored pen blank with a hollow cross-section structure is extruded.

[0046] According to one embodiment of the present disclosure, the resin colored pen granules obtained in step (2) can be fed into a screw extruder. For example, the resin colored pen granules can be fed through a hopper and then enter a melting and heating chamber to form a molten material. For example, the molten material can be sheared and extruded by a screw into a special-shaped forming mold, and a resin colored pen blank with a hollow cross-section can be extruded through a thermoplastic extrusion process.

[0047] According to the embodiments of the present disclosure, a screw extruder and a special-shaped molding die can be used to extrude a resin color pen blank with a hollow cross-section structure through resin color pen granules based on a thermoplastic extrusion process. Exemplarily, the screw extruder can fully plasticize and evenly mix the resin color pen granules by relying on the pressure and shear force generated by the rotation of the screw, and the special-shaped molding die provided at the extrusion end of the screw extruder realizes the molding of the resin color pen blank with a hollow cross-section structure.

[0048] As an example, the screw extruder can be selected as a twin-screw extruder, a single-screw extruder or a multi-screw extruder, etc., which is not specifically limited here. For example, the screw extruder can be selected as a twin-screw extruder, which has the advantages of high output, high quality, high efficiency, good plasticizing effect, easy operation, low cost, etc.

[0049] According to an embodiment of the present disclosure, the shape of the cavity portion of the special-shaped molding die matches the shape of the hollow structure portion of the resin colored pen.

[0050] Figure 1 A resin colored pen according to an embodiment of the present disclosure is schematically shown.

[0051] According to one embodiment of the present disclosure, Figure 1 As shown, the cross section of the resin colored pen is a regular hexagonal periphery, and the center has a circular hollow structure. Accordingly, the special-shaped molding mold may include, for example, a regular hexagonal mold peripheral wall and a circular core rod located at the center of the mold cavity defined by the mold peripheral wall, so that the mold cavity portion of the special-shaped molding mold matches the shape of the hollow structure portion of the resin colored pen, thereby ensuring that the resin colored pen with a specific cross section and a hollow structure can be stably produced.

[0052] It should be noted that those skilled in the art can design a special-shaped molding mold according to actual needs or application scenarios to generate resin colored pens with corresponding cross-sectional shapes, which is not specifically limited here.

[0053] According to an embodiment of the present disclosure, the special-shaped forming die is detachably connected to the extrusion end of the screw extruder.

[0054] According to the embodiments of the present disclosure, the special-shaped forming die can be detachably connected to the extrusion end of the screw extruder, so that different special-shaped forming dies can be quickly replaced according to production needs to adapt to different product specifications or materials, which is conducive to reducing downtime in production and improving overall production efficiency. In addition, the detachable connection method can also facilitate the removal of the special-shaped forming die for maintenance or cleaning.

[0055] According to an embodiment of the present disclosure, in the step of granulating the resin colored pencil mixed material, the heating temperature of the resin colored pencil mixed material is 140°C to 160°C, for example, it can be 140°C, 145°C, 150°C, 155°C or 160°C.

[0056] According to the embodiments of the present disclosure, the material components in the resin colored pen mixture include polyethylene, stearic acid, paraffin, thermoplastic elastomer and talcum powder, and these materials can have good thermal stability within the temperature range of 140°C ~ 160°C, which can avoid the decomposition of materials or performance degradation in the resin colored pen mixture due to excessively high temperature, and the resin colored pen mixture can be effectively melted within the temperature range of 140°C ~ 160°C and has good fluidity, thereby ensuring the uniformity and continuity of the extrusion of the resin colored pen granules during the granulation process, thereby ensuring the molding quality of the resin colored pen granules, and ensuring the smooth progress of the subsequent preparation process.

[0057] According to an embodiment of the present disclosure, in the step of heating and melting the resin colored pen particles, the heating temperature of the resin colored pen particles is 140°C to 160°C, for example, it can be 140°C, 145°C, 150°C, 155°C or 160°C.

[0058] According to the embodiments of the present disclosure, the material components in the resin colored pen granules include polyethylene, stearic acid, paraffin, thermoplastic elastomer and talcum powder, and these materials can have good thermal stability within the temperature range of 140°C to 160°C, which can avoid the decomposition or performance degradation of the materials in the resin colored pen mixture due to excessively high temperature, and the resin colored pen granules can be effectively melted within the temperature range of 140°C to 160°C and have good fluidity, thereby ensuring the uniformity and continuity of the extrusion of the resin colored pen blank during the extrusion process, thereby ensuring the molding quality of the resin colored pen blank, and ensuring the smooth progress of the subsequent preparation process.

[0059] According to an embodiment of the present disclosure, step (6) includes: pulling and straightening the cooled resin colored pen blank to obtain an intermediate resin colored pen blank, and cutting the intermediate resin colored pen blank to form a semi-finished resin colored pen; the method for preparing a resin colored pen also includes: (7) sharpening: sharpening the semi-finished resin colored pen to produce a finished resin colored pen with a hollow cross-section.

[0060] According to an embodiment of the present disclosure, the pulling step can pull out the colored pencil blank to facilitate subsequent processing. The straightening step can be used to correct the straightness of the resin colored pencil to ensure that the resin colored pencil is straight and to ensure its stability and accuracy during use. The cutting step can cut the long colored pencil blank into a semi-finished resin colored pencil of a specific length, which meets the needs of standardized production and is convenient for packaging and sales. More preferably, the semi-finished resin colored pencil can also be sharpened to make a finished resin colored pencil with a hollow structure in cross section. The sharpening step can facilitate users to perform fine writing and painting, improve the ease of use of the resin colored pencil, and help to further enhance the user experience.

[0061] According to the embodiments of the present disclosure, after vacuum forming, the resin colored pen blank is pulled out at a uniform speed along the water cooling groove and cooled by water. The cooled resin colored pen blank is pulled, straightened and cut by a straightening turntable at the end of the water cooling groove. There are multiple straightening turntables, and the multiple straightening turntables are symmetrically arranged on both sides of the axis of the water cooling groove, and the distance between each two adjacent straightening turntables is equal.

[0062] According to an embodiment of the present disclosure, after extrusion, the resin colored pen blank with a hollow cross-section structure can enter a vacuum shaping mold to shape the hollow structure portion. After vacuum shaping, the resin colored pen blank can be pulled out along a water cooling tank at a uniform speed to water cool the resin colored pen blank. After water cooling, the resin colored pen blank can be pulled and straightened by a straightening turntable at the end of the water cooling tank, and cut by a cutter to finally obtain a finished resin colored pen with a hollow cross-section structure.

[0063] As an example, there can be multiple straightening turntables, and the multiple straightening turntables are symmetrically arranged on both sides of the axis of the water cooling trough, and the distance between each two adjacent straightening turntables is equal, so that the colored pencil blank can be evenly stressed when being pulled, and the straightness of the colored pencil blank can be accurately adjusted.

[0064] According to another aspect of the embodiments of the present disclosure, a resin colored pen is provided. The resin colored pen is made by the above-mentioned preparation method. The resin colored pen is integrally formed, and the cross-section of the resin colored pen is a hollow structure.

[0065] It should be noted that the resin colored pen provided in the embodiment of the present disclosure can be used as a pencil for writing, and can also be used as a drawing stick for painting.

[0066] Figure 4 The cross section of a resin colored pen according to some embodiments of the present disclosure is exemplarily shown.

[0067] According to one embodiment of the present disclosure, Figure 4 As shown, the hollow structure of the resin color pen can be arranged at the center of the cross section of the resin color pen.

[0068] For example, Figure 4 As shown, the peripheral shape of the cross section of the resin colored pen can be selected as a circle, an ellipse, a rectangle, a rhombus, a regular polygon (such as a regular triangle, a square, a regular pentagon, a regular hexagon, a regular heptagon, a regular octagon), etc. Figure 4 Not all are shown in the figure, and those skilled in the art can make reasonable settings according to actual needs or application scenarios, etc., and no limitation is made here.

[0069] For example, Figure 4 As shown, the shape of the hollow structure at the center of the cross section of the resin colored pen can be, for example, a circle, an ellipse, a rectangle, a rhombus, a regular polygon, a T-shape, etc., and can also be a spindle, a windmill, a star, a dumbbell, etc. Figure 4 Not all are shown in the figure, and those skilled in the art can make reasonable settings according to actual needs or application scenarios, etc., and no limitation is made here.

[0070] It should be noted that the above is only an exemplary embodiment of the cross-section of a resin colored pen. Those skilled in the art can arbitrarily replace and combine the peripheral shape and the hollow structure shape of the cross-section of the resin colored pen. Any local changes or modifications that are derived from the technical ideas of the present disclosure and are easily inferred by those skilled in the art do not depart from the scope of protection of the present disclosure.

[0071] According to an embodiment of the present disclosure, the materials used to prepare the resin colored pen in the above preparation method include thermoplastic main body material, stearic acid, paraffin, thermoplastic elastomer and talcum powder, which can be well applied to the processing technology of thermoplastic extrusion to realize the one-piece molding of the resin colored pen. According to actual needs, both ends of the resin colored pen can be used for writing and drawing.

[0072] It is understandable that, through the aforementioned method for preparing resin colored pens, it is possible to realize continuous and efficient production of one-piece resin colored pens with a hollow cross-section structure based on a simpler thermoplastic extrusion process, thereby simplifying the production process and effectively saving material usage, thereby reducing the material cost required for production. Since the hollow structure reduces the material usage of the resin colored pen, the amount of material wasted when the resin colored pen is rolled can also be reduced, so the resin colored pen provided by the embodiment of the present disclosure has better economy. In addition, the resin colored pen with a hollow cross-section structure can also present a unique product appearance based on the hollow structure after rolling / when used, which is conducive to improving the interest of the colored pen and the user's experience.

[0073] According to an embodiment of the present disclosure, the proportion of the hollow structure part of the resin colored pen to the resin colored pen is determined based on the hardness and support of the resin colored pen, wherein the hardness of the resin colored pen is determined based on the resin colored pen material used to make the resin colored pen, and the support of the resin colored pen is determined based on the shape of the hollow structure part of the resin colored pen.

[0074] The following is a further description of the disclosed embodiments by specific examples. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. Moreover, in the absence of conflict, the details in the following embodiments may be arbitrarily combined into other feasible embodiments.

[0075] It should be noted that the following specific examples are only for illustration, and the protection scope of the present disclosure is not limited thereto. The raw materials used in the following examples are all commercially available or prepared by a recognized processing method.

[0076] Embodiment 1:

[0077] 20 parts of polyethylene, 10 parts of stearic acid, 20 parts of paraffin, 2 parts of thermoplastic elastomer, 8 parts of carbon black and 20 parts of talc are mixed by weight to obtain a resin color pen mixed material 1. The resin color pen mixed material is heated and granulated to obtain a resin color pen granular material, and the heating temperature is 140°C.

[0078] The resin colored pen granules 1 are heated and melted to form a molten material, and the heating temperature is 140° C. The molten material is passed through a special-shaped forming die, and a resin colored pen blank with a hollow cross-section structure is extruded based on a thermoplastic extrusion process. The resin colored pen blank is vacuum-formed, the vacuum-formed resin colored pen blank is pulled out and cooled, and the cooled resin colored pen blank is cut to obtain a resin colored pen with a hollow cross-section structure.

[0079] Embodiment 2:

[0080] The preparation process of this embodiment 2 is substantially the same as that of embodiment 1, except that 40 parts of polyethylene, 20 parts of stearic acid, 40 parts of paraffin, 5 parts of thermoplastic elastomer, 10 parts of carbon black, and 40 parts of talcum powder are mixed by weight to obtain a resin colored pen mixture 2.

[0081] Embodiment 3:

[0082] The preparation process of this embodiment 3 is substantially the same as that of embodiment 1, except that when the resin color pen mixture is heated and granulated, the heating temperature is adjusted to 160° C. When the resin color pen granules are heated and melted, the heating temperature is adjusted to 160° C.

[0083] Embodiment 4:

[0084] The preparation process of this embodiment 4 is substantially the same as that of embodiment 1, except that the cooled resin color pen blank is pulled and straightened to obtain an intermediate resin color pen blank. The intermediate resin color pen blank is cut to form a semi-finished resin color pen. The semi-finished resin color pen is sharpened to obtain a finished resin color pen with a hollow cross-section.

[0085] Figure 2 The cross section of a resin colored pen according to one embodiment of the present disclosure is schematically shown. Figure 3 A cross section of a resin colored pen according to another embodiment of the present disclosure is schematically shown.

[0086] like Figure 2 and Figure 3 As shown, it can be understood that the resin colored pens with hollow structures of different shapes have different support degrees. The resin colored pens made of resin colored pen materials with different components and / or proportions also have different hardnesses.

[0087] According to the embodiments of the present disclosure, the hardness of the resin colored pen can be determined based on the resin colored pen material used to make the resin colored pen, and the support degree of the resin colored pen can be determined based on the shape of the hollow structure part of the resin colored pen. Thus, the proportion of the hollow structure part in the resin colored pen can be determined based on the hardness and support degree of the resin colored pen to ensure a balance between the usability and economy of the resin colored pen.

[0088] As an example, when the hardness of the resin colored pen is relatively high and the support of the resin colored pen is relatively good, the proportion of the hollow structure part to the resin colored pen can be set to be relatively high. As another example, when the hardness of the resin colored pen is relatively low and the support of the resin colored pen is relatively poor, the proportion of the hollow structure part to the resin colored pen can be set to be relatively low.

[0089] In the above description of the present disclosure, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with respect to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present disclosure, those skilled in the art can understand the specific meanings of the above terms in the present disclosure according to the specific circumstances.

[0090] According to the above description of the present disclosure, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of the present disclosure, and are only for the purpose of facilitating the explanation of the scheme of the present disclosure and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present disclosure.

[0091] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A method for preparing a resin colored pen, characterized in that: include: (1) Mixing resin colored pen materials: 20-40 parts by weight of a thermoplastic main material, 10-20 parts by weight of stearic acid, 20-40 parts by weight of paraffin wax, 2-5 parts by weight of a thermoplastic elastomer, 5-10 parts by weight of a coloring material, and 20-40 parts by weight of talcum powder to obtain a resin colored pen mixed material, wherein the thermoplastic main material is selected from any one of the following: polyethylene, polystyrene, or a copolymer of acrylonitrile, butadiene, and styrene; (2) Granulating the resin colored pen mixed material: Granulating the resin colored pen mixed material obtained in step (1) to prepare resin colored pen granular material; (3) extruding a resin colored pen blank: heating and melting the resin colored pen granules obtained in step (2) to form a molten material, and passing the molten material through a special-shaped forming die to extrude a resin colored pen blank having a hollow cross-section structure based on a thermoplastic extrusion process; (4) vacuum shaping: vacuum shaping the resin color pen blank obtained in step (3); (5) Water cooling: pulling out the vacuum-formed resin color pen blank and cooling it; (6) Cutting: Cutting the cooled resin colored pen blank to obtain a resin colored pen with a hollow structure in cross section.

2. The method according to claim 1, characterized in that: The shapes of the cavity portion of the special-shaped molding die and the hollow structure portion of the resin colored pen match each other.

3. The method according to claim 1, characterized in that In the step of granulating the resin colored pencil mixed material, the heating temperature of the resin colored pencil mixed material is 140° C. to 160° C.

4. The method according to claim 1, characterized in that In the step of heating and melting the resin colored pen particles, the heating temperature of the resin colored pen particles is 140° C. to 160° C.

5. The method according to claim 1, characterized in that The step (3) comprises: feeding the resin colored pen granules into a screw extruder, the resin colored pen granules passing through the melting and heating chamber of the screw extruder to form a molten material, the molten material entering the special-shaped forming die through the screw shearing and extrusion of the screw extruder, and extruding the resin colored pen blank with a hollow cross-section structure.

6. The method according to claim 5, characterized in that The special-shaped forming die is detachably connected to the extrusion end of the screw extruder.

7. The method according to any one of claims 1 to 6, characterized in that The step (6) comprises: pulling and straightening the cooled resin color pen blank to obtain an intermediate resin color pen blank, and cutting the intermediate resin color pen blank to form a semi-finished resin color pen; The method further comprises: (7) sharpening: sharpening the semi-finished resin colored pen to produce a finished resin colored pen with a hollow structure in cross section.

8. The method according to claim 7, characterized in that After vacuum shaping, the resin colored pen blank is pulled out at a uniform speed along the water cooling groove and cooled by water. The cooled resin colored pen blank is pulled, straightened and cut by a straightening turntable at the end of the water cooling groove. There are multiple straightening turntables, and the multiple straightening turntables are symmetrically arranged on both sides of the axis of the water cooling groove, and the distance between each adjacent two straightening turntables is equal.

9. A resin colored pen, characterized in that: The resin colored pen is made by the method described in any one of claims 1 to 8, the resin colored pen is integrally formed, and the cross section of the resin colored pen is a hollow structure.

10. The resin colored pen according to claim 9, characterized in that: The proportion of the hollow structure part of the resin colored pen to the resin colored pen is determined based on the hardness and support of the resin colored pen, wherein the hardness of the resin colored pen is determined based on the resin colored pen material used to make the resin colored pen, and the support of the resin colored pen is determined based on the shape of the hollow structure part of the resin colored pen.

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