Plastic caps and closures molding

We are a specialized manufacturer of high-performance custom plastic caps and closures. We engineer and produce functional sealing solutions for bottles, containers, and industrial packages where precision, reliability, and user experience are critical. As your dedicated molding partner—not a trading company—we provide complete in-house design, tooling, production, and assembly services, delivering closures that perfectly mate with your containers and protect your products.

Our Service: Engineered Closures & Ready-to-Use Assemblies

We manufacture the critical component that secures and dispenses your product. Our expertise covers the entire closure system: from the custom cap to the integration of liners, valves, droppers, or hinged mechanisms. We supply finished, assembled closures—including attached liners (induction or pressure-sensitive), over-caps, or tamper-evident bands—ready for your capping line.

Custom Design for Sealing, Function, and Ergonomics

A successful closure is a feat of precision engineering. We design every feature to meet specific functional goals:

Top Panel & Skirt: The top provides structural integrity and branding space; the skirt is engineered with specific thread profiles (continuous, lugs, bayonet) or snap-on features for a secure, user-friendly fit with the container neck.

Sealing System: The core of the design. We engineer various sealing surfaces: linerless lands for direct contact with the bottle finish, liner retention shelves for inserted seals, or integral sealing rings (like Flip-Top® style).

Tamper-Evident & Safety Features: We design and produce integrated tamper-evident bands (TE bands) that connect to the skirt via breakable bridges, and child-resistant (CR) mechanisms that require specific push-and-turn or squeeze-to-open actions.

Dispensing & Applicator Features: This includes integrated flip-top lids, spouts, dropper tips, brushes, or sprayer pump mating threads for specialized product delivery.

Ergonomics & Grip: Textured skirts, knurling, or ribbed patterns are designed for easy opening and closing, even with wet hands.

Material Science for Closure Performance

The right material ensures chemical compatibility, durability, and cost-effectiveness. We select from a range of FDA-compliant and engineering-grade resins:

Polypropylene (PP): The industry standard for most caps and closures. Offers excellent chemical resistance, good flexibility for snap-fits and living hinges (e.g., flip-top caps), and stress-crack resistance. Available in food-grade and medical grades.

Polyethylene (PE): LDPE is used for soft, squeeze-drop applicator tips. HDPE offers higher stiffness for heavy-duty or chemical closures.

Polyethylene Terephthalate (PET): Used for crystal-clear closures to match PET bottles, offering excellent clarity and recyclability in a single-material stream.

Engineering Resins (e.g., SAN, Acetal): Selected for specific needs like superior clarity (SAN) or extremely low moisture absorption and high stiffness for precision threads (Acetal).

The Precision Molding Process for High-Volume Consistency

Closure molding demands extreme precision, fast cycles, and absolute consistency to ensure perfect seal and function across millions of units.

High-Cavitation Tooling Expertise: We design and build robust molds with a high number of cavities (e.g., 32, 64, 96+) to achieve the production volumes and unit economics required for closure applications. This requires expert hot-runner systems and cooling design.

Process for Dimensional Stability: We maintain ultra-tight process controls to manage the uniform shrinkage of semi-crystalline materials like PP and PE. This is non-negotiable for holding the critical thread dimensions and sealing surface tolerances that prevent leaks.

In-Mold Assembly & Decoration:

Overmolding/2-Shot Molding: For creating soft-touch grips or flexible seals integrated into a rigid cap in a single automated cycle.

In-Mold Labeling (IML): For applying full-color, durable graphics directly onto the cap surface during molding, eliminating a secondary step.

Key Advantages of Our Closure Molding:

Leak-Free Performance Guarantee: Our precision engineering and process control ensure sealing surfaces are molded consistently, batch after batch.

Optimized for High-Speed Capping Lines: We design closures that feed, orient, and apply reliably on your high-speed equipment, minimizing downtime.

Integrated Solution: We handle the complexity by molding the cap, adding the liner, and assembling components, providing a single sourced, tested closure system.

Speed to Market & Cost Efficiency: Our expertise in high-cavitation tooling and efficient processing delivers the low unit costs and scalability your project requires.

Why Partner with Us for Your Caps & Closures?

Our differentiation is our dedicated focus on closure systems as engineered components, not just commodity parts. We provide critical Design for Manufacturing (DFM) analysis to optimize your closure for performance, cost, and assembly. We function as an extension of your R&D and production teams, managing the entire supply chain for the closure and ensuring it is perfectly tailored to your container and filling process.

Choose us when your application demands a sealing solution that is reliable, user-friendly, and manufacturable at scale. We deliver not just plastic caps, but engineered closure systems that protect your product and your brand.

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.