Plastic cap mold

We specialize in custom plastic cap mold development, plastic cap component production, and optional assembly services—not finished product trading. Our molds are engineered to match your plastic caps’ unique needs (e.g., leak-proof seals, thread precision, brand-specific designs) , with tailored structures, food-safe/industrial-grade material compatibility, and optimized injection molding to deliver reliable plastic cap parts for packaging, electronics, and industrial equipment.

1. Custom Mold Structures: Tailored to Plastic Cap Requirements

Plastic caps (e.g., beverage bottle caps, cosmetic jar caps, electronic device dust caps) demand strict sealing performance, precise thread fitting, and often aesthetic details—our mold structures are customized to address these key demands:

Cavity & Core: Machined via high-precision CNC threading tools (tolerance as tight as ±0.01mm for threads) to replicate critical features—such as internal/external threads (for screw-on caps), sealing rings (0.5–1mm thick for leak-proofing), anti-skid textures (on cap tops/edges), and embossed logos (0.1–0.2mm depth for brand recognition). For flip-top caps, the mold’s hinge structures are calibrated to ensure flexible opening/closing (≥10,000 cycles without breaking).

Gating System: Designed to avoid visible marks on cap surfaces and ensure uniform material flow. For small caps (diameter ≤30mm), pin gates (0.5–0.8mm) positioned at the cap’s non-visible base are used—they leave minimal residues and eliminate post-molding trimming. For large caps (diameter ≥80mm), hot runner systems with multi-point gates ensure even filling, reducing material waste by 12–18% and preventing thread deformation.

Cooling System: Optimized for caps’ thin-walled (0.3–1.5mm) and circular/oval shapes. Spiral cooling channels around the mold cavity ensure rapid, even heat dissipation—critical for maintaining thread precision and avoiding warping (a major issue for leak-proof performance). Cooling time is reduced by 25–35% via targeted temperature control (20–40°C), boosting production efficiency.

Ejection System: Uses ejector sleeves (for threaded caps, to avoid thread damage) or stripper plates (for smooth-top caps) to protect sealing structures and 外观. For flip-top caps, soft-ejection mechanisms prevent hinge stress—ensuring long-term flexibility and functionality.

2. Suitable Plastic Materials: Matched to Plastic Cap Applications

Plastic caps serve diverse roles (food contact, chemical resistance, dust protection)—we select materials based on safety, durability, and use scenarios:

PP (Polypropylene): Ideal for food/beverage caps (e.g., water bottle caps, soda caps, sauce jar caps). Meets FDA food-contact standards, offers good chemical resistance (to acids/alkalis), and low moisture absorption (no swelling that affects sealing). It’s also lightweight and cost-effective, suitable for high-volume packaging.

PE (Polyethylene): Used for flexible or low-cost caps (e.g., cosmetic tube caps, detergent bottle caps). Provides good impact resistance (even at low temperatures, -20°C), soft texture (for easy screwing), and compatibility with printing/labeling—suitable for non-food, daily-use packaging.

PET (Polyethylene Terephthalate): Perfect for high-transparency caps (e.g., cosmetic jar caps, clear beverage caps). Features excellent clarity (85–90% light transmittance) for product visibility, good heat resistance (up to 120°C, suitable for hot-fill applications), and scratch resistance—ideal for premium packaging.

ABS (Acrylonitrile Butadiene Styrene): Great for industrial/electronic caps (e.g., device dust caps, machinery port caps). Offers high rigidity (Shore D 75–80) for impact protection, chemical resistance (to oils/dust), and easy coloring—suitable for harsh environments (e.g., factories, outdoor equipment).

LDPE (Low-Density Polyethylene): Suitable for squeezable caps (e.g., lotion pump caps, condiment bottle caps). Provides high flexibility (Shore D 40–50) for easy squeezing, good sealability, and resistance to deformation—ideal for packaging with dispensing functions.

3. Injection Molding Process: Optimized for Plastic Cap Quality

Our injection molding process is fine-tuned to meet plastic caps’ strict sealing and precision demands, with these core advantages:

Leak-Proof Precision: Injection parameters (temperature 180–240°C, pressure 60–100MPa) are optimized to ensure uniform wall thickness and dense material structure—no internal voids that cause leaks. Each batch undergoes pressure testing (e.g., 0.5MPa air pressure for 30 seconds) to confirm sealing performance, with a leak rate below 0.1%.

Thread Accuracy: Computer-controlled servo molding machines maintain thread tolerance at ±0.01mm—ensuring caps fit perfectly with bottle necks (no loose or stuck issues). Post-molding thread inspection via optical scanners guarantees consistency across batches.

High-Volume Efficiency: Multi-cavity molds (32–96 cavities, based on cap size) maximize output. For standard 28mm water bottle caps, daily production reaches 300,000–500,000 components. Automated sorting, quality checking, and packaging systems reduce labor costs and ensure 99.9% defect-free output.

Cost Optimization: Hot runner systems minimize material waste; for orders over 100,000 caps, per-unit cost can be reduced by 10–15%. Two-shot molding is optional for caps needing dual properties (e.g., rigid PP core + soft TPE seal), integrating functions in one step and cutting assembly costs.

4. Our Services: Beyond Molds—Plastic Caps & Assembly

We provide end-to-end solutions for plastic cap production, not just molds:

Plastic Cap Manufacturing: Produce custom caps in various sizes (diameter 10–150mm), shapes (circular, square, oval), and designs (screw-on, flip-top, push-pull). Supports custom colors (RAL/Pantone codes), surface treatments (matte finish, UV coating), and safety features (child-resistant locks for medicine caps).

Value-Added Assembly: Optional assembly services for cap sub-assemblies—such as attaching foam/sealing gaskets (for enhanced leak-proofing), assembling flip-top hinges with springs, or integrating dispensing nozzles (for pump caps). Delivers ready-to-install cap units, saving your production time.

Custom Design Support: Offer 3D mold design and rapid prototyping (via SLA 3D printing). We can produce 50–100 prototype caps in 2–3 days for you to test sealing performance, fitting accuracy, and user-friendliness—optimizing the mold design before mass production.

We are plastic mold maker and can provide custom mold service, we can make injection molds, blow molds, rotational molds and die-casting molds.

For custom injection molds, we can provide professional custom injection molding services. Usually Plastic injection mold manufacturing Molding are manufactured using injection molding technology. The mold materials for injection molds can be chosen from P20, 718, S136, H13 and so on. The mold material reflects the mold life and product material requirements.

For parts that require blow molding production, we can also provide professional custom blow molding services.

Plastic injection mold manufacturing Injection Mould making

1.We communicate product design according to samples/drawings and your requirements.

2.After the product design is confirmed, we carry out the mold design, we provide all kinds of injection molds, blow molds, silicone molds, die-casting molds services.

3.Material procurement, steel cutting and mold basic tools.

4.Mold assembly

5.Mold inspection, tracking and controlling mold processing.

6. We will inform you the date of mold trial and send you the sample inspection report and injection parameters together with the sample.

7.Your instruction and confirmation of shipment.

8.Prepare the mold before packing.

Plastic injection mold manufacturing molding Specification

1. Professional manufacturer, design, production injection mould and stamping mould quality control

2. rich export experience plastic injection mould and stamping mould

3. Reasonable price of design mould

4. Cavities: single or as per your requirements cavity

5. Treatment: S45C Pretreat>25Hrc,And Nitriding

6. Mould Steel: Cavity ,Core and slide: P20 ,2738,2136 available Moldbase :LKM available

7. Standard:DEM ,HUSKY,available

8. Hot runner: according to your demand

9. Life time: >300 Thousand Times

10. Package: Plywood case, anti-rust paint

Mold design：

Information you need to provide us

1. If you have drawings, 2D drawings, 3D drawings (preferably in STEP format).

2. If there are no drawings, you need to provide specific length, width, height and weight information. (It’s best to send us samples)

3. Should the mold be sent to your country, or leave the mold in our factory and we will help you produce the product.

4. Mold material requirements, cavity number requirements (you can tell us about the size of your injection molding machine)

5. Product material requirements and product quantity. (You can tell us about the use of the product and we can give you suggestions)

Transaction process:

Mold testing：

Once the mold is complete, I do a mold test. It usually takes about 3-5 days to complete. We need to assemble the mold, adjust the pressure data of the machine, and try production. We need to check whether there are problems during the normal production of the mold and make modifications.

Product packaging

Packaging according to your needs

1.By air ,it takes 3-7 days for delivery .The goods can be shipped by DHL ,Fedex ,UPS .

2.By sea ,the delivery time is based on your port .

To South East Asian Countries takes about 5-12 days

To Middle east countries takes about 18-25 days

To European countries takes about 20-28 days

To American countries takes about 28-35 days

To Australia takes about 10-15 days

To African countries takes about 30-35 days.

Factory

Video-1: (Factory Video)

Video-2: (Injection Molding)

Video-3: (Blow molding)

Video-4: (Blow molding)

Video-5: (Roll molding)

Customer satisfaction is our most important goal. We focus on communication and cooperation with our customers, always pay attention to their needs and provide quick response and quality customer service. Our injection production mold factory is committed to establishing long-term relationships and ensuring that our customers receive the best after-sales service during the purchase and use of our products, and we will definitely do our best to solve any problems for our customers.

FAQ

1. Who are we?

We are based in Zhejiang, China, start from 2014,sell to North America(30.00%),Southern Europe(10.00%),Northern.

Europe(10.00%),Central America(10.00%),Western Europe(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%). There are total about 51-100 people in our office.

2. How can we guarantee quality?

Always a pre-production sample before mass production;

Always final Inspection before shipment.

3. What can you buy from us?

Mould,Plastic Product, Metal Product,Dental Product,CNC machining.

4. Why should you buy from us not from other suppliers?

Ningbo P&M Plastic Metal Product Co., Ltd. We main do all kinds of 3d design, 3d printing and plastic metal molds tooling and products. We have our own engineer and factory. One-stop supply:3d design - 3d printing - mold making - plastic injection.

5. What services can we provide?

Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU;

Accepted Payment Currency:USD,EUR;

Accepted Payment Type: T/T,L/C,PayPal,Western Union,Escrow;

Language Spoken:English,Chinese,Spanish,French,Russian.

6. What are the characteristics of your service?

1. Your inquiry related to our products or prices will be replied within 24hours.

2. Welltrained and experienced staffs to answer all your enquiries in fluent English.

3. Offering the support to solve the problem in the application or selling period.

4. Competitive prices based on same quality.

5. Guarantee samples quality same as mass production quality.