Filling plastic rod three-in-one crayon easy to roll and cut and preparation method thereof
By using easily shaving resin material to make the plastic pen barrel and the inverted conical straight rib structure, the problems of inconvenience and environmental pollution of traditional crayons are solved, realizing the production of low-carbon and environmentally friendly three-in-one crayons, simplifying the process and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-28
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional crayons are inconvenient to use, not environmentally friendly, and have complicated and costly production processes. In particular, three-in-one crayons use wood to wrap the material and have low production efficiency.
The plastic pen barrel is made of easily rollable resin material, and the three-in-one crayon refill is directly injected into the plastic pen barrel and fixed by an inverted cone and straight rib structure, which simplifies the production process and improves efficiency.
The design achieves a low-carbon and environmentally friendly three-in-one crayon, simplifying the production process, reducing costs, and improving production efficiency.
Smart Images
Figure CN121756772A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of drawing tools, and in particular to a three-in-one crayon with an easy-to-sharpen, refillable plastic handle and its preparation method. Background Technology
[0002] Traditional crayons are made primarily from paraffin wax and other synthetic waxes, fillers, and pigments, through melting, mixing, and molding. Their advantages are simple processing and low cost. However, they have disadvantages such as difficulty in washing off stains from clothing, skin, or other objects, and slippery surfaces when drawing or writing on smooth surfaces. Furthermore, traditional crayons often use oil-soluble pigments, which have poor biodegradability and are not environmentally friendly. Considering that children are the primary users of crayons, the safety and environmental friendliness of crayon materials are paramount. It is foreseeable that washable and environmentally friendly crayons will become a trend and gain increasing popularity.
[0003] Crayons, pastels, and watercolors on the market are mostly different types and forms. To meet different drawing and painting needs, consumers often need to buy and use them separately, which is inconvenient and wasteful. Therefore, a product that can be used as a crayon, pastel, and watercolor all at once would be very popular. However, the three-in-one crayons on the market use wood as the wrapping material, which consumes a lot of wood, making them neither low-carbon nor environmentally friendly. Furthermore, the production process of three-in-one crayon refills requires grinding the material, adding it to the melting tank of a molding machine, heating and stirring it to melt it, pouring it into the mold cavity of the molding machine, cooling it with cold water, ejecting it from the mold, and then wrapping the three-in-one crayon refills in wood. The production process is cumbersome, inefficient, and costly. Summary of the Invention
[0004] The purpose of this invention is to provide an easy-to-roll, three-in-one crayon with a plastic handle and its preparation method, thereby solving the above-mentioned problems.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] This invention discloses an easy-to-sharpen, refillable, plastic-tube three-in-one crayon, comprising a hollow plastic tube, a cap, and a three-in-one crayon refill. The three-in-one crayon refill is filled into the interior of the plastic tube and, after cooling, is fixed to the inner wall of the plastic tube. The bottom of the cap is inserted from the top of the plastic tube, and the bottom outer wall of the cap has an annular protrusion. The cap is secured to the top of the plastic tube via the annular protrusion. The inner wall of the plastic tube has an inverted cone and a raised straight rib.
[0007] Furthermore, the plastic pen barrel is made of resin material.
[0008] Furthermore, the length of the plastic pen barrel is 100-150mm, and the outer diameter is 8-15mm.
[0009] A method for preparing an easy-to-sharpen, three-in-one crayon with a refillable plastic handle, characterized by comprising the following steps:
[0010] A. Making the plastic pen barrel:
[0011] a1. Pen barrel injection mold making: Processing injection molds according to the required design pattern of the pen barrel;
[0012] a2. Pen barrel material mixing: The resin granules of pen barrel material are fed into the injection molding machine. The pen barrel material granules are discharged through the hopper and enter the melting heating chamber to form molten material. The molten material is pressurized and sent into the cavity of the injection mold.
[0013] a3. After cooling, the pen barrel is demolded, completing the production of the pen barrel;
[0014] B. Making the cap:
[0015] b1. Manufacturing of injection mold for pen barrel end cap: Processing the injection mold according to the design pattern required for the pen barrel;
[0016] b2. Cap Injection Molding: The cap PS high transparency resin granules or PP resin material are fed into the injection molding machine. The pen barrel material granules are discharged through the hopper and enter the melting heating chamber to form molten material. The molten material is pressurized and sent into the cavity of the injection mold. After being extruded through the mold in the molding cavity, the cap is formed.
[0017] b3. After cooling, the product is demolded, completing the production of the cap.
[0018] C. Filling and molding:
[0019] c1. Attach the cap to the plastic pen barrel, and then insert the capped end of the plastic pen barrel into the slot opened on the filling plate;
[0020] c2. Pour the molten three-in-one crayon paste into the filling plate, and let the paste flow into the plastic pen barrel through the filling plate;
[0021] c3. After natural cooling, remove the plastic three-in-one crayon from the filling plate;
[0022] D. Packaging finished products.
[0023] Furthermore, the barrel heating temperature of the injection molding machine is 180-220℃.
[0024] Furthermore, the filling plate has 24 slots arranged in two rows.
[0025] Compared with the prior art, the beneficial technical effects of the present invention are as follows:
[0026] This invention uses an easy-to-shave resin material as the coating material for a three-in-one crayon colored pencil. The three-in-one crayon lead is directly filled into the plastic pen barrel and formed. The inverted cone prevents the three-in-one crayon lead from falling off, and the straight ribs prevent the three-in-one crayon lead from rotating during shaving and use. The overall structure is low-carbon and environmentally friendly, with a simple process, high production efficiency, and low cost. Attached Figure Description
[0027] The present invention will be further described below with reference to the accompanying drawings.
[0028] Figure 1 This is a schematic diagram of the structure of the three-in-one crayon with an easily rollable plastic filling rod of the present invention;
[0029] Figure 2 A cross-sectional view of the three-in-one crayon with an easily rollable plastic filling rod according to the present invention;
[0030] Figure 3 Two cross-sectional views of the three-in-one crayon with an easily rollable plastic filling rod according to the present invention;
[0031] Figure 4 This is a top view of the filling plate;
[0032] Figure 5 This is a sectional view of the filling plate;
[0033] Explanation of the attached labels: 1. Plastic pen barrel; 2. Three-in-one crayon refill; 3. Cap; 4. Inverted cone; 5. Straight rib. Detailed Implementation
[0034] like Figure 1-3 As shown, an easy-to-sharpen, refillable plastic-barreled three-in-one crayon includes a hollow plastic barrel 1, a cap 2, and a three-in-one crayon refill 3. The plastic barrel 1 is made of resin material, and the length of the plastic barrel 1 is 100-150mm, and the outer diameter is 8-15mm.
[0035] The three-in-one crayon refill 3 is poured into the interior of the plastic pen barrel 1. After cooling, the three-in-one crayon refill 3 is fixed to the inner wall of the plastic pen barrel 1. The bottom of the cap 2 is inserted from the top of the plastic pen barrel 1. The bottom outer wall of the cap 2 has an annular protrusion. The cap 2 is secured to the top of the plastic pen barrel 1 by the annular protrusion. The inner wall of the plastic pen barrel 1 has an inverted cone 4 and a raised straight rib 5. The inverted cone 4 prevents the three-in-one crayon refill from falling off, and the straight rib 5 prevents the three-in-one crayon refill from rotating during sharpening and use.
[0036] A method for preparing an easy-to-sharpen, refillable plastic three-in-one crayon includes the following steps:
[0037] A. Making the plastic pen barrel:
[0038] a1. Pen barrel injection mold making: Processing injection molds according to the required design pattern of the pen barrel;
[0039] a2. Pen barrel material mixing: The resin granules of the pen barrel material are fed into the injection molding machine. The pen barrel material granules are discharged through the hopper and enter the melting heating chamber to form molten material. The barrel heating temperature of the injection molding machine is 180-220℃. The molten material is pressurized and sent into the cavity of the injection mold.
[0040] a3. After cooling, the pen barrel is demolded, completing the production of the pen barrel;
[0041] B. Making the cap:
[0042] b1. Manufacturing of injection mold for pen barrel end cap: Processing the injection mold according to the design pattern required for the pen barrel;
[0043] b2. Cap Injection Molding: The cap PS high transparency resin granules or PP resin granules are fed into the injection molding machine. The pen barrel material granules are discharged through the hopper and enter the melting heating chamber to form molten material. The barrel heating temperature of the injection molding machine is 180-220℃. The molten material is pressurized and sent into the cavity of the injection mold. After being extruded through the mold in the molding cavity, the cap is formed.
[0044] b3. After cooling, the product is demolded, completing the production of the cap.
[0045] D. Filling and molding:
[0046] c1. Attach the cap to the plastic pen barrel, and then insert the capped end of the plastic pen barrel into the slots on the filling plate. The filling plate has 24 slots arranged in two rows.
[0047] c2. Pour the molten three-in-one crayon paste into the filling plate, and let the paste flow into the plastic pen barrel through the filling plate;
[0048] c3. After natural cooling, remove the plastic three-in-one crayon from the filling plate;
[0049] D. Packaging finished products.
[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. A three-in-one wax crayon of easy roll-off, filled plastic stick characterized in that: The utility model relates to a hollow plastic pen barrel (1), a cap (2) and a three-in-one wax pencil core (3), the three-in-one wax pencil core (3) is filled into the inside of the plastic pen barrel (1), the three-in-one wax pencil core (3) is fixed on the inner wall of the plastic pen barrel (1) after cooling, the bottom of the cap (2) is inserted from the top of the plastic pen barrel (1), the bottom outer wall of the cap (2) is equipped with annular convex, the cap (2) is clamped on the top of the plastic pen barrel (1) through the annular convex, the inner wall of the plastic pen barrel (1) is equipped with inverted cone (4) and convex straight rib (5).
2. The easy roll-out, erasable, filled plastic stick tri-wax crayon of claim 1, wherein: The plastic pen barrel (1) is made of resin material.
3. The easy roll-out, erasable, filled plastic stick tri-wax crayon of claim 1, wherein: The length of the plastic pen barrel (1) is 100-150mm, and the outer diameter is 8-15mm.
4. A method of making a three-in-one wax pencil of the kind comprising a rolled and cut plastic barrel, a filler and a wick, according to any one of claims 1 to 3, characterized in that, The utility model relates to a hollow plastic pen barrel (1), a cap (2) and a three-in-one wax pencil core (3), the three-in-one wax pencil core (3) is filled into the inside of the plastic pen barrel (1), the three-in-one wax pencil core (3) is fixed on the inner wall of the plastic pen barrel (1) after cooling, the bottom of the cap (2) is inserted from the top of the plastic pen barrel (1), the bottom outer wall of the cap (2) is equipped with annular convex, the cap (2) is clamped on the top of the plastic pen barrel (1) through the annular convex, the inner wall of the plastic pen barrel (1) is equipped with inverted cone (4) and convex straight rib (5). The plastic pen barrel (1) is made of resin material. The length of the plastic pen barrel (1) is 100-150mm, and the outer diameter is 8-15mm. The utility model relates to a hollow plastic pen barrel (1), a cap (2) and a three-in-one wax pencil core (3), the three-in-one wax pencil core (3) is filled into the inside of the plastic pen barrel (1), the three-in-one wax pencil core (3) is fixed on the inner wall of the plastic pen barrel (1) after cooling, the bottom of the cap (2) is inserted from the top of the plastic pen barrel (1), the bottom outer wall of the cap (2) is equipped with annular convex, the cap (2) is clamped on the top of the plastic pen barrel (1) through the annular convex, the inner wall of the plastic pen barrel (1) is equipped with inverted cone (4) and convex straight rib (5). The length of the plastic pen barrel (1) is 100-150mm, and the outer diameter is 8-15mm. The utility model relates to a hollow plastic pen barrel (1), a cap (2) and a three-in-one wax pencil core (3), the three-in-one wax pencil core (3) is filled into the inside of the plastic pen barrel (1), the three-in-one wax pencil core (3) is fixed on the inner wall of the plastic pen barrel (1) after cooling, the bottom of the cap (2) is inserted from the top of the plastic pen barrel (1), the bottom outer wall of the cap (2) is equipped with annular convex, the cap (2) is clamped on the top of the plastic pen barrel (1) through the annular convex, the inner wall of the plastic pen barrel (1) is equipped with inverted cone (4) and convex straight rib (5). The length of the plastic pen barrel (1) is 100-150mm, and the outer diameter is 8-15mm. The utility model relates to a hollow plastic pen barrel (1), a cap (2) and a three-in-one wax pencil core (3), the three-in-one wax pencil core (3) is filled into the inside of the plastic pen barrel (1), the three-in-one wax pencil core (3) is fixed on the inner wall of the plastic pen barrel (1) after cooling, the bottom of the cap (2) is inserted from the top of the plastic pen barrel (1), the bottom outer wall of the cap (2) is equipped with annular convex, the cap (2) is clamped on the top of the plastic pen barrel (1) through the annular convex, the inner wall of the plastic pen barrel (1) is equipped with inverted cone (4) and convex straight rib (5). The length of the plastic pen barrel (1) is 100-150mm, and the outer diameter is 8-15mm. The length of the plastic pen barrel (1) is 100-150mm, and the outer diameter is 8-15mm. 5. The method of making an easy roll, easy cut, easy fill plastic straw tri- wax crayon of claim 4, wherein: 6. The method of making an easy roll, easy cut, easy fill plastic straw tri- wax crayon of claim 4, wherein: