Description
Pen Mold Parts are key mold components used in the production of writing instruments such as ballpoint pens, ballpoint pens, and fountain pens, including pen tip molds, pen holder injection molds, pen clip molds, ink tube molding molds, and mold inserts. The material is usually made of high wear-resistant tool steel (such as S136, NAK80, H13) or hard alloy (such as YG8, YG15), and the surface treatment process includes nitriding treatment (hardness ≥ 900HV), mirror polishing (Ra ≤ 0.05 μ m), and chrome plating (thickness 0.005-0.01mm), ensuring that the mold has high precision, corrosion resistance, and long life characteristics.
Characteristics of Pen Mold Parts
1. High precision and dimensional stability
Mold accuracy ± 0.005mm, thermal expansion coefficient ≤ 1.2 × 10 ⁻⁵/℃ (S136 material). Pen molds need to meet the requirements of small size. For example, a certain neutral pen manufacturer uses the S136 pen holder mold, which has a hardness of 52HRC after vacuum quenching. When injecting ABS plastic, the outer diameter tolerance of the pen holder is controlled within ± 0.01mm to ensure assembly accuracy with the pen core.
2. Corrosion resistance and anti adhesive properties
The depth of the nitride layer is 0.02-0.03mm, and the surface hardness is ≥ 900HV. The mold is prone to corrosion when exposed to ink or plastic for a long time. For example, a certain ballpoint pen manufacturer used a nitrogen treated pen tip mold. After continuously producing 100000 pens, the mold surface showed no rust and the ink residue decreased by 80%, reducing the cleaning frequency.
3. Mirror polishing and appearance quality
Polishing grade SPI A1 (Ra ≤ 0.01 μ m), smoothness ≥ 800GU. The appearance of the pen holder should be free of scratches or flow marks. For example, a high-end pen manufacturer uses the NAK80 pen holder mold, which is mirror polished and then injected with PC material to achieve a surface finish of 900GU, meeting the luxury grade appearance requirements.
4. Quick mold change and modular design
The standard interface is compatible with international standards such as DME and HASCO, and the mold change time is ≤ 15 minutes. Modular design can shorten downtime. For example, a stationery manufacturer uses a detachable pen clip mold component, which eliminates the need to disassemble the entire mold when changing the pen clip shape, resulting in a 30% increase in production efficiency.
5. High wear resistance and long lifespan
Hard alloy inserts have a hardness of ≥ 90HRA and a service life of ≥ 2 million times. The pen tip mold needs to withstand high-frequency stamping. For example, a certain ballpoint pen manufacturer uses YG8 hard alloy pen tip molds. When continuously stamping 0.5mm thick stainless steel pen tips, the single use life can reach 2.5 million times, which is 5 times longer than the tool steel mold life.
Application scenarios of Pen Mold Parts
1. Ballpoint pen manufacturing industry
Pen tip stamping, pen holder injection molding, pen clip molding.
2. Neutral pen manufacturing industry
Pen holder injection molding, ink tube molding, pen cap assembly.
3. Pen manufacturing industry
Precise stamping of pen tip, metal processing of pen holder, and formation of ink cartridge.
4. Erasable pen manufacturing industry
Thermal ink tube molding, dual color injection molding of pen holder.
5. Touchpen manufacturing industry
Forming of conductive material for pen tip and processing of metal shell for pen holder.
6. Gift pen customization industry
Personalized pen holder carving, pen clip laser marking.
Cleaning and Maintenance Guide for Pen Mold Parts
1. Daily cleaning
Steps:
Use a soft bristled brush to remove plastic residue or ink from the surface of the mold;
Dip a cotton cloth in neutral cleaning agent (such as isopropanol) and wipe, avoiding the use of acidic and alkaline solvents;
After cleaning, apply a thin layer of anti rust oil (such as WD-40) with a thickness of ≤ 0.02mm.
2. Regular maintenance
Cycle: Perform deep maintenance after every 500000 production cycles.
Operation:
Disassemble mold accessories and clean with an ultrasonic cleaning machine (frequency 40kHz, temperature 30 ℃);
Check the wear of the mold blade or cavity, and grind if necessary (grinding amount ≤ 0.03mm/time);
After reassembly, conduct a trial mold to confirm the product size and appearance quality.
3. Storage requirements
Environment: Temperature 10-25 ℃, humidity ≤ 40%, no corrosive gases;
Protection: Apply anti rust oil to the surface of the mold, wrap it with dust-proof cloth, and store it in a dedicated mold rack to avoid heavy pressure or collision.
Pen Mold Parts FAQs
Q1: How to choose the material of pen mold accessories?
A: Choose according to production needs. For example, it is recommended to use S136 or NAK80 for injection molded plastic pen holders; It is recommended to use YG8 hard alloy or H13 tool steel for stamping metal pen tips.
Q2: How to evaluate the lifespan of mold accessories?
A: The lifespan depends on the material, heat treatment, and usage conditions. For example, after nitriding treatment, the lifespan of the S136 pen stem mold can reach 1-1.5 million cycles; The lifespan of YG8 hard alloy pen tip mold can reach 2-3 million cycles.
Q3: How to solve the problem of mold sticking?
A: Adopting nitriding treatment or chrome plating process, or adjusting injection parameters such as injection pressure and holding time. For example, a certain manufacturer reduced mold sticking by 70% through chrome plating treatment.
Q4: How to repair scratches on the surface of the mold?
A: Minor scratches can be restored by polishing (using diamond abrasive paste, particle size W5-W1); Serious scratches need to be returned to the factory for welding repair and reprocessing.
Q5: Can mold accessories be customized?
A: Support customization. 2D drawings (in formats such as DWG/DXF) or 3D models (STEP/IGES) are required, with clear requirements for material, hardness, tolerances, and surface treatment.
