Our Polyoxymethylene POM Injection Molding Services

Elevate your high-performance production with Yigu Technology’s premium Poliossimetilene (Pom) Servizi di stampaggio a iniezione—where precision meets durability. Leveraging our injection molding expertise, advanced machinery, and custom tooling, we deliver POM parts that excel in low friction, alta rigidità, and dimensional stability—perfect for automotive, industriale, elettronica, and consumer applications demanding reliable, long-lasting components.​

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Cos'è il poliossimetilene (Pom) Stampaggio a iniezione?

Poliossimetilene (Pom), commonly known as acetal resin, is a high-performance engineering thermoplastic renowned for its exceptional mechanical properties and low friction. Derived from formaldehyde monomers (either homopolymers or copolymers), POM’s linear molecular structure gives it a unique combination of strength, rigidità, and wear resistance that mimics metal. Stampaggio a iniezione is a manufacturing process that melts POM pellets, injects the molten material into a custom mold cavity, cools it to solidify, and ejects the finished part. Insieme, POM injection molding produces robust, precision-engineered components ideal for moving parts, marcia, and other applications where low friction and dimensional consistency are critical.​

Definizioni chiave & Core Concepts​

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Material Properties of POM​

POM’s unique properties set it apart as a top choice for engineering applications, often replacing metal (PER ESEMPIO., ottone, acciaio) to reduce weight and cost:​

• Alta resistenza: Tensile strength of 60–70 MPa (POM homopolymer: 70 MPA; copolimero: 60 MPA)—stronger than ABS (40 MPA) and comparable to some metals.​

• Basso attrito: Coefficient of friction (0.15–0.30) similar to Teflon but with higher wear resistance—ideal for parts that slide or rotate.​

• Alta rigidità: Flexural modulus of 2.5–3.5 GPa—retains shape under load (critical for structural parts like gears or hinges).​

• Stabilità dimensionale: Basso coefficiente di espansione termica (Cte: 8–12 × 10⁻⁵/°C) e assorbimento di umidità minimo (0.2–0,5%)—ensures parts fit consistently in tight assemblies.​

Resistenza chimica: Resistente agli oli, grassi, solventi, e la maggior parte dei prodotti chimici domestici (except strong acids/bases like nitric acid).

Le nostre capacità: Delivering High-Performance POM Injection Molding

Alla tecnologia Yigu, we specialize in POM injection molding—our capabilities are tailored to handle POM’s unique processing challenges (Sensibilità all'umidità, high crystallinity) and deliver parts that meet the strictest industry standards (PER ESEMPIO., Iso 9001 per automobili, FDA per dispositivi medici).​

Creazione di capacità di base

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The POM Injection Molding Process: Step-by-Step Precision

POM’s unique characteristics—high crystallinity, Sensibilità all'umidità, and fast cooling rate—require a specialized, optimized process to maintain strength, basso attrito, stabilità dimensionale. Our workflow minimizes defects and maximizes performance, whether you’re producing 50 gear prototypes or 500,000 automotive hinges.​

Fare un passo 1: Preparazione del materiale (Critical for POM)​

POM absorbs moisture rapidly (fino a 0.5% In 24 ore a 50% umidità), che causa hydrolytic degradation (cracking, fragilità, or reduced strength) during molding. Our preparation process eliminates this risk:​

• Asciugatura: POM pellets are dried in dehumidifying dryers at 80–100°C for 3–4 hours (homopolymer: 90°C/4hrs; copolimero: 80°C/3hrs) to reduce moisture content to <0.05%.​

• Additive/Filler Blending: Mix dried pellets with additivi (UV stabilizers for outdoor use, lubricants to enhance low friction) O riempitivi (glass fiber for extra strength, carbon fiber for conductivity—note: fillers increase stiffness but may reduce friction performance).​

• Magazzinaggio: Dried pellets are stored in sealed, heated hoppers (50–60 ° C.) to prevent reabsorbing moisture before molding.​

Fare un passo 2: Design dello stampo (Optimized for POM)​

POM’s high crystallinity (60–80%) and fast cooling rate cause significant shrinkage (1.5–3,0%)—mold design must account for this to avoid warping or dimensional errors:​

• Shrinkage Compensation: Molds are sized 1.5–3.0% larger than the final part (homopolymer: 2.5–3.0% shrinkage; copolimero: 1.5–2,0%).​

• Cooling Systems: Uniform water-cooling channels (spaced 15–25mm apart) to prevent uneven cooling (che provoca deformazione); mold temperature maintained at 40–80°C (higher temp = slower cooling = reduced internal stress).​

• Supporto per la progettazione in parte: We advise on adding draft angles (1–2 °) and fillets (0.5–1mm) to POM parts—prevents cracking during ejection and improves mold filling.​

Fare un passo 3: Injection Parameters (Tailored to POM Grades)​

POM’s narrow melting range (160–180°C for copolymer; 175–185°C for homopolymer) requires precise parameter tuning to avoid degradation (ingiallimento) or incomplete filling. Below are standard settings for two common grades:​

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Fare un passo 4: Post-Molding Operations​

After demolding, POM parts may undergo:​

• Taglio: Rimozione della plastica in eccesso (flash) with sharp, low-friction tools (to avoid scratching POM’s surface—critical for low-friction parts like bearings).​

• Ricottura: Heating parts to 120–140°C for 1–2 hours, Quindi raffreddamento lentamente (10–15°C/hour) Per ridurre lo stress interno (prevents cracking in high-stress applications like automotive gears).​

• Trattamento superficiale: Applying coatings, tessitura, or printing (Vedi la sezione 5 per i dettagli).​

• Ispezione: QC checks for:​

• Precisione dimensionale: Laser measurement (±0.002mm tolerance) to ensure parts fit in assemblies.​

• Friction Performance: Taber abrasion testing (wear rate: <10 mg/1,000 cycles for general-purpose POM).​

Forza: Testi di trazione (ASTM D638) to verify strength meets specs (≥60 MPa for copolymer).

Materiali: Choosing the Right POM Grade for Your Project

Not all POM is the same—each grade (homopolymer, copolimero, rafforzato) is tailored to specific applications, balancing strength, flessibilità, e costo. Selecting the right grade ensures your parts meet performance, normativo, and design goals.​

Common POM Types for Injection Molding​

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Material Selection Tips​

1. Prioritize strength vs. flessibilità: For high-stress moving parts (marcia), choose POM homopolymer; for parts prone to impact (cerniere della porta), pick copolymer.​

2. Consider environmental exposure: Per uso esterno, select UV-stabilized POM; for chemical-rich environments (macchinari industriali), use standard copolymer (better chemical resistance than homopolymer).​

Embrace sustainability: Our rPOM is ideal for brands focused on eco-friendly practices—use it for non-critical parts (PER ESEMPIO., marce giocattolo) to cut costs and reduce environmental impact.

Trattamento superficiale: Enhancing POM’s Function & Estetica

POM’s natural surface is smooth (supports its low-friction properties) but can be modified to improve grip, durata, or branding—without compromising its core performance. We offer five core treatments tailored to POM:​

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Vantaggi: Why Choose POM Injection Molding?

POM injection molding offers unmatched benefits for engineering applications requiring a blend of strength, basso attrito, and dimensional stability—often replacing metal to reduce weight, costo, and maintenance.​

Key Advantages of POM Injection Molding​

• Alta resistenza & Rigidità: Stronger than most plastics (Addominali, Pp) and comparable to brass (resistenza alla trazione: 60–70 MPa vs. brass’s 70–80 MPa)—ideal for structural parts that replace metal.​

• Basso attrito & Resistenza all'usura: Coefficient of friction (0.15–0.30) and wear rate ( <10 mg/1,000 cycles) make POM parts last 3–5x longer than ABS or PP in moving applications (PER ESEMPIO., marcia).​

• Stabilità dimensionale: Minimal moisture absorption (0.2–0,5%) and low thermal expansion (8–12 × 10⁻⁵/°C)—ensures parts fit consistently in tight assemblies (PER ESEMPIO., Connettori elettronici, Sensori automobilistici).​

• Costo-efficacia: Cheaper than metal (Pom: ​3.50–5.00/kg vs. ottone: ​8.00–12.00/kg) and requires less post-processing (no machining like metal parts); injection molding drives unit costs down to ​0.15–0.80 per part.​

• Resistenza chimica: Resiste agli oli, grassi, and solvents—ideal for parts exposed to harsh fluids (PER ESEMPIO., Componenti del motore automobilistico, macchinari industriali).​

POM vs. Other Engineering Plastics & Metallo

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Industria delle applicazioni: Where POM Injection Molding Excels

POM’s unique blend of low friction, alta resistenza, and dimensional stability makes it indispensable in engineering-focused industries—often replacing metal to cut costs and weight while maintaining performance. Below are real-world use cases and our tailored solutions:​

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Casi studio: Our POM Injection Molding Success Stories

We’ve helped clients across industries solve complex challenges with POM injection molding—delivering parts that replace metal, reduce maintenance, e migliorare le prestazioni. Below are three standout projects:​

Caso di studio 1: POM Copolymer Automotive Door Hinges​

• Sfida: Una casa automobilistica leader necessaria 500,000 door hinges that were lightweight (Per migliorare l'efficienza del carburante), resistente all'impatto (to withstand 100,000+ door openings), ed economico (to replace brass hinges). Their previous brass hinges were heavy (adding 0.5kg per car) and prone to rust.​

• Soluzione: Abbiamo raccomandato POM copolymer for its balance of flexibility (Resistenza all'ambiente: 10 KJ /) e forza. Our custom molds included shrinkage compensation (2.0% for copolymer) and uniform cooling channels to prevent warping. We added a minor texturing to the hinge surfaces to reduce friction and improve wear resistance.​

• Risultati: The POM hinges were 60% lighter than brass (reducing per-car weight by 0.3kg and improving fuel efficiency by 1.5%) e costo 40% meno. They passed 150,000 door-opening tests with no cracks or deformation, and showed no signs of wear after 3 years of real-world use. The automaker expanded their order to 1 million hinges/year for all their sedan models.​

Caso di studio 2: POM Homopolymer Industrial Conveyor Gears​

• Sfida: A logistics company needed 10,000 conveyor gears that could withstand 24/7 operazione, resist lubricating oil, and have low friction (to reduce energy use). Their previous ABS gears failed after 3 months due to high wear and poor oil resistance.​

• Soluzione: Abbiamo usato POM homopolymer for its exceptional wear resistance (Taber wear rate: <5 mg/1,000 cycles) and oil resistance. Our molds were polished to Ra 0.1 µm (to enhance low-friction properties) and included optimized gating to ensure full filling of the gear teeth. Post-molding, we annealed the gears at 130°C for 1 hour to reduce internal stress.​

• Risultati: The POM homopolymer gears lasted 18 mesi (6x longer than ABS) and reduced conveyor energy use by 8% (due to lower friction). They showed no swelling or degradation after 12 months of exposure to lubricating oil, and the client now uses our POM gears for all their global conveyor systems—saving $200,000/year in replacement costs.​

Caso di studio 3: FDA-Compliant POM Copolymer Syringe Plungers​

• Sfida: Necessità di un'azienda di dispositivi medici 200,000 syringe plungers that were biocompatible (incontra ISO 10993), liscio (to ensure precise fluid control), and sterilizable (via autoclaving). Their previous PP plungers were too flexible, causing inconsistent fluid delivery.​

• Soluzione: Abbiamo selezionato FDA-compliant POM copolymer (meets USP Class VI standards) for its stiffness (flexural modulus: 2.8 GPA) e superficie liscia. Our molds had mirror-polished cavities (Ra 0.05 µm) to ensure plunger smoothness, and we optimized injection parameters (170°C barrel temp, 90 Pressione MPA) per evitare difetti superficiali. Post-molding, we performed 100% controlli dimensionali (±0.002mm tolerance) to ensure consistent fit in syringes.​

Risultati: The POM plungers provided 30% more precise fluid control than PP (per clinical tests) e passò 50+ cicli di autoclave (121° C.) with no warping. They met all ISO 10993 standard di biocompatibilità, and the client expanded our partnership to produce plungers for their entire line of insulin and vaccine syringes.

Why Choose Us for Your POM Injection Molding Needs?

With countless injection molding suppliers offering POM services, Yigu Technology stands out for our deep specialization in POM, uncompromising quality, and ability to solve engineering challenges. Here’s why leading brands in automotive, industriale, and medical sectors trust us:​

1. Specialized POM Expertise​

We don’t just mold plastics—we specialize in Polyoxymethylene (Pom). I nostri ingegneri hanno 15+ years of experience optimizing processes for POM’s unique traits:​

• Moisture sensitivity: Proprietary drying protocols (A <0.05% umidità) that eliminate cracking and brittleness.​

• Shrinkage control: Mold design techniques (shrinkage compensation, raffreddamento uniforme) that ensure dimensional accuracy (± 0,002 mm).​

• Low-friction optimization: Mold polishing (Ra 0.1–0.2 μm) and coating solutions that enhance POM’s natural low-friction properties.​

We’ve worked with every POM grade (homopolymer, copolimero, pieno di vetro, riciclato) and know how to tailor solutions for metal replacement, ALTERIE, or precision applications.​

2. Rigorous Quality Assurance​

Quality is critical for POM parts—especially those replacing metal or used in safety-critical applications. Teniamo Iso 9001 (produzione generale) E Iso 13485 (produzione di dispositivi medici) certificazioni, con a 99.6% defect-free rate for POM components. Our quality checks include:​

• Pre-molding: Moisture testing (Karl Fischer titration) to ensure POM pellets are dry (<0.05%).​

• In-molding: Real-time laser measurement for dimensional accuracy and vision inspection for surface defects (graffi, flash).​

• Post-molding:​

• Test di usura (Taber abrasion) for moving parts (marcia, cuscinetti).​

• Testi di trazione (ASTM D638) per verificare la forza (≥60 MPa for copolymer).​

• Regulatory compliance (FDA 21 Cfr 177.2470 for food/medical POM; UL94 V0 for flame-retardant POM).​

3. Customer-Focused Service​

We treat your project as a partnership—our goal is to solve your problems, not just deliver parts. From day one, you’ll work with a dedicated account manager who:​

• Provides free material/design consultations (PER ESEMPIO., helping you choose between POM homopolymer and copolymer for metal replacement).​

• Shares 3D mold designs and sample parts (entro 4 giorni) for approval before full production.​

• Offers flexible lead times: 3–5 giorni per i prototipi (stampi in alluminio), 2–4 settimane per corse ad alto volume (stampi in acciaio).​

• Fornisce 24/7 support for urgent issues (PER ESEMPIO., expediting parts for broken industrial machinery).​

4. Soluzioni innovative

Investiamo 7% delle nostre entrate annuali in R&D to push the boundaries of POM injection molding. Recent innovations include:​

• Metal-Replacement POM Blends: A proprietary mix of POM homopolymer and glass fiber (POM-GF15) that matches 90% of brass’s strength at 50% the weight and cost.​

• Self-Lubricating POM: POM grades infused with solid lubricants (PTFE particles) that reduce friction by 30% contro. standard POM—ideal for oil-free applications (PER ESEMPIO., food-processing machinery).​

• Fast-Cycle Molding: Custom cooling systems that cut POM cycle time by 20% (from 25s to 20s) without compromising quality—speeding up production for high-volume orders.​

5. Sustainable Practices​

We’re committed to reducing our environmental impact while delivering top-tier POM parts:​

• Recycled POM (rPOM): Foniamo 40% of our POM materials from post-industrial waste (PER ESEMPIO., POM scrap from automotive manufacturing) and offer rPOM grades that cost 15–25% less than virgin POM.​

• Riduzione dei rifiuti: Ricicliamo 96% di rottami di produzione (flash, parti difettose) back into the molding process—sending only 4% to landfills.​

Efficienza energetica: Le nostre macchine per stampaggio a iniezione utilizzano unità a frequenza variabile (Vfds) per ridurre il consumo di energia di 22% contro. standard equipment—lowering our carbon footprint and your costs.

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