Injection molding process for marker pen parts with smooth surface

Abstract

The application discloses a kind of marker parts surface smooth injection molding processes, it is related to injection molding processing field, specifically includes the following steps: S1, mold processing, accurate injection mold, and the injection mold is washed, while the injection mold is preheated and brush demolding agent treatment, and the injection mold is fixed in clamping, in the injection mold after clamping is installed in turnover vibration machine;The marker parts surface smooth injection molding process of the application, by melt in mold is vibrated after each injection, so that the bubble in melt can be removed, while by controlling the turnover period of turnover vibration machine can guarantee the turnover angle of turnover vibration machine is 90 degrees in one injection interval, so as to guarantee the uniformity of turnover vibration machine vibration, while the mold can be vibrated from multiple angles, so as to avoid the pore of injection molding part after setting, facilitate to improve the production quality of injection molding part, facilitate people to use.

Description

Technical Field

[0001] This invention relates to injection molding technology, specifically to an injection molding process for smoothing the surface of marker pen parts. Background Technology

[0002] Currently, synthetic fibers have been widely used in the pen manufacturing industry in recent years. Internationally popular marker pens are a new type of writing instrument that uses nylon elastic yarn for the nib and polyester fiber for the ink reservoir. Marker pens are widely used in education, office work, drawing, and industrial design due to their smooth writing, even and rich colors, variety of ink colors, dust-free writing, ability to adjust line width at any time, and erasability. Marker pens, also known as marker pens or markers, consist of a pen holder and a refill inside the holder. The front of the holder has a nib that extends and inserts into the refill. They are a type of colored drawing pen specifically for writing or drawing, and are very commonly used. Currently, the main production method for marker pen parts is plastic injection molding.

[0003] Currently, plastic injection molding involves injecting molten plastic into a mold under pressure, where it cools and solidifies to obtain various desired plastic parts. Specialized injection molding machines are available for this purpose. The most commonly used plastics are polyethylene, polypropylene, ABS, PA, and polystyrene. This process often results in numerous air bubbles being generated when the molten plastic is injected into the mold. These bubbles remain in the molten plastic and are difficult to remove. After injection molding, these bubbles form pores, thus affecting the quality of the molded parts. Summary of the Invention

[0004] The purpose of this invention is to provide an injection molding process for smoothing the surface of marker pen parts, thereby overcoming the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an injection molding process for smoothing the surface of marker pen parts, specifically including the following steps:

[0006] S1. Mold processing: Prepare the injection mold, clean the injection mold, preheat the injection mold and apply release agent, close and fix the injection mold, and then install the closed injection mold on the flipping vibration machine.

[0007] S2. Injection molding raw material processing: Select injection molding raw materials, heat and melt the injection molding raw materials and stir them evenly to make injection molding melt for later use;

[0008] S3, mold injection: The prepared injection solution is injected into the mold through the injection nozzle. The injection is divided into multiple injections. After each injection, the process is stopped for 4-12 seconds, and the mold is vibrated by a rotating vibration machine until the multiple injections are completed.

[0009] S4. Mold cooling: Spray cooling water onto the surface of the mold to cool it down. The temperature of the cooling water should be 20-30 degrees Celsius until the mold and the internal melt are completely cooled to room temperature.

[0010] S5. Mold opening and demolding: Open the cooled mold and simultaneously inject high-pressure gas into the mold through the injection nozzle to demold, obtaining the injection molded part blank.

[0011] S6. Injection molding part processing: Cut and grind the injection interface and burrs of the injection molding part blank to obtain the injection molding part.

[0012] S7. Mold release agent treatment: Remove the injection molded part and treat the surface of the injection molded part with mold release agent to ensure that there is no residual mold release agent on the surface of the injection molded part.

[0013] Furthermore, in S1, the release agent is polyethylene wax, and the preheating time of the injection mold is 150-200 degrees Celsius for 10-20 minutes.

[0014] Furthermore, in step S2, the injection molding raw material contains heat stabilizers, flame retardants, and modifiers, and during mixing, a high-speed mixer is used for mixing at a speed of 100 r / min for 10-15 minutes, and the heating temperature during mixing is 100-120 degrees Celsius.

[0015] Furthermore, in S3, the mold is injected four times, and the injection pressure during each injection is 80-120 MPa.

[0016] Furthermore, in S3, the flipping vibration machine is an ultrasonic flipping vibration machine, the ultrasonic flipping vibration machine operates for 4-12 seconds each time, and the flipping cycle of the flipping vibration machine is 1-3 seconds.

[0017] Furthermore, after injection molding in S3 is completed, the mold needs to be subjected to pressure holding treatment. Pressure needs to be continuously applied to the inside of the mold, with a pressure value of 50-70 kg / cm3 and a holding time of 40-60 minutes.

[0018] Furthermore, in S4, the water cooling time for the mold is 10-20 minutes.

[0019] Compared with the prior art, the present invention provides an injection molding process for smoothing the surface of marker pen parts. By vibrating the melt in the mold after each injection, air bubbles in the melt can be removed. At the same time, by controlling the rotation cycle of the tumbling vibrator, the rotation angle of the tumbling vibrator can be guaranteed to be 90 degrees within one injection interval, thereby ensuring the uniformity of the vibration of the tumbling vibrator. It can also vibrate the mold from multiple angles, thereby avoiding the formation of air holes in the injection molded parts after shaping, which facilitates the improvement of the production quality of injection molded parts and makes them easier for people to use. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Example 1:

[0024] Please see Figure 1 A smooth injection molding process for marker pen parts includes the following steps:

[0025] S1. Mold processing: Prepare the injection mold, clean the injection mold, preheat the injection mold and apply release agent, close and fix the injection mold, and then install the closed injection mold on the flipping vibration machine.

[0026] S2. Injection molding raw material processing: Select injection molding raw materials, heat and melt the injection molding raw materials and stir them evenly to make injection molding melt for later use;

[0027] S3, mold injection: The prepared injection solution is injected into the mold through the injection nozzle. The injection is divided into multiple injections. After each injection, the process is stopped for 4 seconds, and the mold is vibrated by a rotating vibration machine until the multiple injections are completed.

[0028] S4. Mold cooling: Spray cooling water onto the surface of the mold to cool it down. The temperature of the cooling water should be 20-30 degrees Celsius until the mold and the internal melt are completely cooled to room temperature.

[0029] S5. Mold opening and demolding: Open the cooled mold and simultaneously inject high-pressure gas into the mold through the injection nozzle to demold, obtaining the injection molded part blank.

[0030] S6. Injection molding part processing: Cut and grind the injection interface and burrs of the injection molding part blank to obtain the injection molding part.

[0031] S7. Mold release agent treatment: Remove the injection molded part and treat the surface of the injection molded part with mold release agent to ensure that there is no residual mold release agent on the surface of the injection molded part.

[0032] In S1, the release agent is polyethylene wax, and the preheating time of the injection mold is 150-200 degrees Celsius for 10-20 minutes.

[0033] In S2, heat stabilizers, flame retardants and modifiers are added to the injection molding raw materials. During mixing, a high-speed mixer is used with a mixing speed of 100 r / min and a mixing time of 10-15 minutes. The heating temperature during mixing is 100-120 degrees Celsius.

[0034] In S3, the mold is injected four times, and the injection pressure during each injection is 80-120 MPa.

[0035] In S3, the tumbling vibration machine adopts an ultrasonic tumbling vibration machine. The ultrasonic tumbling vibration machine operates for 4 seconds each time, and the tumbling cycle of the tumbling vibration machine is 1.778 seconds. This setting allows the melt in the mold to be vibrated after each injection, thereby removing air bubbles from the melt. At the same time, by controlling the tumbling cycle of the tumbling vibration machine, the tumbling angle of the tumbling vibration machine can be guaranteed to be 90 degrees within one injection interval, thus ensuring the uniformity of the vibration. It can also vibrate the mold from multiple angles, thereby avoiding the formation of air holes in the injection molded parts after shaping, which facilitates the improvement of the production quality of injection molded parts and makes it convenient for users.

[0036] After S3 injection molding is completed, the mold needs to be pressure-held. This requires continuous pressure to be applied inside the mold, with a pressure value of 50-70 kg / cm3 and a holding time of 40-60 minutes. This keeps the melt in the mold under a fixed pressure, thereby compacting the melt, further removing air bubbles, and improving the production quality of the injection molded parts.

[0037] In S4, the water cooling time for the mold is 10-20 minutes.

[0038] In S7, the release agent on the surface of the injection molded part is treated by adding nucleating agents and high-melting-point polyolefins to recrystallize the release agent. This not only removes the release agent from the surface of the injection molded part, but also allows the release agent to be recrystallized and utilized.

[0039] Example 2:

[0040] Please see Figure 1 This embodiment provides a technical solution based on Embodiment 1, specifically including the following steps:

[0041] S1. Mold processing: Prepare the injection mold, clean the injection mold, preheat the injection mold and apply release agent, close and fix the injection mold, and then install the closed injection mold on the flipping vibration machine.

[0042] S2. Injection molding raw material processing: Select injection molding raw materials, heat and melt the injection molding raw materials and stir them evenly to make injection molding melt for later use;

[0043] S3, mold injection: The prepared injection solution is injected into the mold through the injection nozzle. The injection is divided into multiple injections. After each injection, the process is stopped for 8 seconds, and the mold is vibrated by a rotating vibration machine until the multiple injections are completed.

[0044] S4. Mold cooling: Spray cooling water onto the surface of the mold to cool it down. The temperature of the cooling water should be 20-30 degrees Celsius until the mold and the internal melt are completely cooled to room temperature.

[0045] S5. Mold opening and demolding: Open the cooled mold and simultaneously inject high-pressure gas into the mold through the injection nozzle to demold, obtaining the injection molded part blank.

[0046] S6. Injection molding part processing: Cut and grind the injection interface and burrs of the injection molding part blank to obtain the injection molding part.

[0047] S7. Mold release agent treatment: Remove the injection molded part and treat the surface of the injection molded part with mold release agent to ensure that there is no residual mold release agent on the surface of the injection molded part.

[0048] In S1, the release agent is polyethylene wax, and the preheating time of the injection mold is 150-200 degrees Celsius for 10-20 minutes.

[0049] In S2, heat stabilizers, flame retardants and modifiers are added to the injection molding raw materials. During mixing, a high-speed mixer is used with a mixing speed of 100 r / min and a mixing time of 10-15 minutes. The heating temperature during mixing is 100-120 degrees Celsius.

[0050] In S3, the mold is injected four times, and the injection pressure during each injection is 80-120 MPa.

[0051] In S3, the tumbling vibration machine adopts an ultrasonic tumbling vibration machine. The ultrasonic tumbling vibration machine operates for 8 seconds each time, and the tumbling cycle of the tumbling vibration machine is 2.47 seconds. This setting allows the melt in the mold to be vibrated after each injection, thereby removing air bubbles from the melt. At the same time, by controlling the tumbling cycle of the tumbling vibration machine, the tumbling angle of the tumbling vibration machine can be guaranteed to be 90 degrees within one injection interval, thus ensuring the uniformity of the vibration. It can also vibrate the mold from multiple angles, thereby avoiding the formation of air holes in the injection molded parts after shaping, which facilitates the improvement of the production quality of injection molded parts and makes it convenient for users.

[0052] After the S3 injection molding is completed, the mold needs to be pressure-held. Pressure needs to be continuously applied to the inside of the mold. The pressure value is 50-70 kg / cm3, and the holding time is 40-60 minutes.

[0053] In S4, the water cooling time for the mold is 10-20 minutes.

[0054] In S7, the release agent on the surface of the injection molded part is treated by adding nucleating agents and high-melting-point polyolefins to recrystallize the release agent.

[0055] Example 1:

[0056] Please see Figure 1 This embodiment provides a technical solution based on Embodiment 1, specifically including the following steps:

[0057] S1. Mold processing: Prepare the injection mold, clean the injection mold, preheat the injection mold and apply release agent, close and fix the injection mold, and then install the closed injection mold on the flipping vibration machine.

[0058] S2. Injection molding raw material processing: Select injection molding raw materials, heat and melt the injection molding raw materials and stir them evenly to make injection molding melt for later use;

[0059] S3, mold injection, the prepared injection solution is injected into the mold through the injection nozzle, and the injection is divided into multiple injections. After each injection, the process is stopped for 12 seconds, and the mold is vibrated by a rotating vibration machine until the multiple injections are completed.

[0060] S4. Mold cooling: Spray cooling water onto the surface of the mold to cool it down. The temperature of the cooling water should be 20-30 degrees Celsius until the mold and the internal melt are completely cooled to room temperature.

[0061] S5. Mold opening and demolding: Open the cooled mold and simultaneously inject high-pressure gas into the mold through the injection nozzle to demold, obtaining the injection molded part blank.

[0062] S6. Injection molding part processing: Cut and grind the injection interface and burrs of the injection molding part blank to obtain the injection molding part.

[0063] S7. Mold release agent treatment: Remove the injection molded part and treat the surface of the injection molded part with mold release agent to ensure that there is no residual mold release agent on the surface of the injection molded part.

[0064] In S1, the release agent is polyethylene wax, and the preheating time of the injection mold is 150-200 degrees Celsius for 10-20 minutes.

[0065] In S2, heat stabilizers, flame retardants and modifiers are added to the injection molding raw materials. During mixing, a high-speed mixer is used with a mixing speed of 100 r / min and a mixing time of 10-15 minutes. The heating temperature during mixing is 100-120 degrees Celsius.

[0066] In S3, the mold is injected four times, and the injection pressure during each injection is 80-120 MPa.

[0067] In S3, the tumbling vibration machine adopts an ultrasonic tumbling vibration machine. The ultrasonic tumbling vibration machine operates for 12 seconds each time, and the tumbling cycle of the tumbling vibration machine is 2.83 seconds. This setting allows the melt in the mold to be vibrated after each injection, thereby removing air bubbles from the melt. At the same time, by controlling the tumbling cycle of the tumbling vibration machine, it is ensured that the tumbling angle of the tumbling vibration machine is 90 degrees within one injection interval, thus ensuring the uniformity of the vibration. It can also vibrate the mold from multiple angles, thereby avoiding the formation of air holes in the injection molded parts after shaping, which facilitates the improvement of the production quality of injection molded parts and makes it convenient for users.

[0068] After the S3 injection molding is completed, the mold needs to be pressure-held. Pressure needs to be continuously applied to the inside of the mold. The pressure value is 50-70 kg / cm3, and the holding time is 40-60 minutes.

[0069] In S4, the water cooling time for the mold is 10-20 minutes.

[0070] In S7, the release agent on the surface of the injection molded part is treated by adding nucleating agents and high-melting-point polyolefins to recrystallize the release agent.

[0071] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An injection molding process for a marker pen component with a smooth surface, characterized in that, Specifically, the following steps are included: S1. Mold processing: Prepare the injection mold, clean the injection mold, preheat the injection mold and apply release agent, close and fix the injection mold, and then install the closed injection mold on the flipping vibration machine. S2. Injection molding raw material processing: Select injection molding raw materials, heat and melt the injection molding raw materials and stir them evenly to make injection molding melt for later use; S3, mold injection: The prepared injection solution is injected into the mold through the injection nozzle. The injection is divided into multiple injections. After each injection, the process is stopped for 4-12 seconds, and the mold is vibrated by a rotating vibration machine until the multiple injections are completed. S4. Mold cooling: Spray cooling water onto the surface of the mold to cool it down. The temperature of the cooling water should be 20-30 degrees Celsius until the mold and the internal melt are completely cooled to room temperature. S5. Mold opening and demolding: Open the cooled mold and simultaneously inject high-pressure gas into the mold through the injection nozzle to demold, obtaining the injection molded part blank. S6. Injection molding part processing: Cut and grind the injection interface and burrs of the injection molding part blank to obtain the injection molding part. S7. Mold release agent treatment: Remove the injection molded part and treat the surface of the injection molded part with mold release agent to ensure that there is no residual mold release agent on the surface of the injection molded part.

2. The injection molding process for achieving a smooth surface on a marker pen component according to claim 1, characterized in that, In step S1, the release agent is polyethylene wax, and the preheating time of the injection mold is 150-200 degrees Celsius for 10-20 minutes.

3. The injection molding process for a smooth surface of a marker pen part according to claim 2, characterized in that, In step S2, the injection molding raw material contains heat stabilizers, flame retardants, and modifiers. During mixing, a high-speed mixer is used with a mixing speed of 100 r / min and a mixing time of 10-15 minutes. The heating temperature during mixing is 100-120 degrees Celsius.

4. The injection molding process for a smooth surface of a marker pen part according to claim 3, characterized in that, In S3, the mold is injected four times, and the injection pressure during each injection is 80-120 MPa.

5. The injection molding process for a smooth surface of a marker pen part according to claim 4, characterized in that, In S3, the flipping vibration machine is an ultrasonic flipping vibration machine. The ultrasonic flipping vibration machine operates for 4-12 seconds each time, and the flipping cycle of the flipping vibration machine is 1-3 seconds.

6. The injection molding process for a smooth surface of a marker pen part according to claim 5, characterized in that, After injection molding in S3 is completed, the mold needs to be subjected to pressure holding treatment, which requires continuous pressure to be applied inside the mold at a pressure value of 50-70 kg / cm². 3 The pressure holding time is 40-60 minutes.

7. The injection molding process for a smooth surface of a marker pen part according to claim 6, characterized in that, In step S4, the water cooling time for the mold is 10-20 minutes.

8. The injection molding process for a smooth surface of a marker pen part according to claim 6, characterized in that, In step S7, the release agent on the surface of the injection molded part is treated by adding a nucleating agent and a high-melting-point polyolefin to recrystallize the release agent.

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