PP plastic mold

We specialize in custom PP plastic mold development, PP (Polypropylene) component production, and optional assembly services—not finished product trading. Our molds are engineered to maximize PP’s unique advantages (chemical resistance, low density, good flowability) , with tailored structures optimized for PP’s molding behavior, delivering high-quality PP parts for packaging, home appliances, automotive, and industrial applications.

1. Custom Mold Structures: Tailored to PP’s Molding Characteristics

PP’s distinct properties (low shrinkage, high melt flow, moderate rigidity) require molds that address its specific needs—such as minimizing warping and leveraging its flow efficiency. Our custom mold structures include:

Cavity & Core: Machined via high-precision CNC machining (tolerance as tight as ±0.02mm) to suit PP’s features:

Optimized wall thickness (1–3mm) to avoid sink marks—PP’s low shrinkage (1.5–2.5%) performs best with uniform thickness, critical for parts like food containers or appliance covers.

Textured or smooth surfaces (Ra ≤0.8μm for smooth parts) to replicate PP’s ability to retain surface details—ideal for packaging with branding or anti-slip requirements.

Draft angles (2–5° for vertical surfaces) to prevent sticking—PP’s low friction coefficient aids demolding, but sufficient angles ensure smooth part removal.

Gating System: Designed for PP’s high flowability (MFR 1–40 g/10min):

Edge gates (for small-to-medium parts, e.g., bottle caps, toy components) to enable fast filling—PP’s rapid flow reduces cycle time and minimizes weld lines.

Hot runner systems (for large or multi-cavity parts, e.g., food trays, automotive interior panels) to maintain consistent melt temperature—reduces material waste by 18–25% and avoids cold runners that waste PP resin.

Cooling System: Calibrated to control PP’s cooling rate (key for dimensional stability):

Even cooling channels (spaced 10–15mm apart) to prevent warping—PP’s semi-crystalline structure can warp if cooled unevenly, especially in large flat parts like storage boxes.

Water-cooled inserts for thickened areas (e.g., handle bases on containers) to speed up cooling—cuts cycle time by 30–40% compared to natural cooling, critical for high-volume production.

Ejection System: Suited to PP’s moderate rigidity:

Ejector pins (arranged at non-visible edges) with flat tips—PP’s flexibility resists marking, but strategic placement avoids damaging functional areas (e.g., sealing edges on lids).

Stripper rings (for cylindrical parts like pipes or caps) to distribute force evenly—prevents deformation of PP’s lightweight structure.

2. PP Material Variants & Their Applications

PP is available in modified grades to match diverse application needs—we select the right PP variant based on your part’s function and environment:

General-Purpose PP (GP-PP): Ideal for everyday items (e.g., food containers, plastic bags, small appliance parts). Offers balanced rigidity (Shore D 60–70), chemical resistance (to water, oils, mild acids), and low cost—suitable for low-stress, indoor use.

High-Impact PP (HI-PP): Used for durable parts (e.g., automotive bumpers, tool cases, children’s toy frames). Modified with rubber additives to boost impact resistance (10–15 kJ/m²)—withstands drops and shocks without cracking, even at low temperatures (-10°C).

Chemical-Resistant PP (CR-PP): Perfect for industrial or medical parts (e.g., chemical storage tanks, laboratory beakers, cleaning equipment components). Resists strong acids, alkalis, and solvents—maintains structural integrity in harsh chemical environments, meeting FDA or industrial safety standards.

Glass-Filled PP (GF-PP, 10–40% GF): Great for structural parts (e.g., automotive underbody components, industrial machine brackets). Reinforced with glass fiber to enhance tensile strength (up to 50 MPa) and reduce shrinkage (1.0–1.2%)—suitable for load-bearing PP parts requiring precision, like automotive sensors or machinery supports.

Heat-Resistant PP (HR-PP): Suitable for high-temperature applications (e.g., microwave-safe food containers, dishwasher parts, engine bay components). Withstands temperatures up to 120–150°C—retains rigidity and shape in hot environments, ideal for parts exposed to heat during use.

3. PP Injection Molding Process: Optimized for Performance

Our injection process is fine-tuned to maximize PP’s advantages, with key benefits:

Precision & Consistency:

Melt temperature control (180–220°C) to avoid overheating—PP degrades at high temperatures, so precise control ensures optimal flow without material damage.

Injection pressure (50–80 MPa) to match PP’s low viscosity—enables full cavity filling without excessive stress, reducing warping in parts like thin-walled packaging.

Dimensional tolerance control (±0.03mm for small parts) via servo-driven machines—critical for PP components needing tight fits, such as bottle caps with sealing requirements.

Efficiency:

Fast cycle times (15–35 seconds per part)—PP’s high flow and quick cooling enable rapid production, ideal for high-volume items like disposable containers (daily output up to 100,000 parts for multi-cavity molds).

Multi-cavity molds (32–96 cavities for small parts, e.g., caps)—PP’s uniform flow supports consistent filling across cavities, ensuring all parts meet quality standards.

Cost-Effectiveness:

Minimal material waste—PP’s high flow reduces scrap from incomplete filling, and hot runner systems cut waste by 18–25%.

No post-processing for most parts—PP’s surface finish and dimensional stability eliminate the need for sanding or trimming, lowering labor costs.

4. Our Services: Beyond Molds—PP Components & Assembly

We provide end-to-end solutions for PP production, tailored to your requirements:

PP Component Manufacturing: Produce custom PP parts in sizes (5×5mm to 1000×800mm), shapes (thin-walled packaging, complex structural parts), and finishes (matte, glossy, anti-slip). Supports color matching (RAL/Pantone codes) and food-safe certifications (FDA, EU 10/2011) for packaging or medical parts.

Value-Added Assembly: Optional assembly services for PP sub-assemblies—such as attaching rubber gaskets (for sealed containers), bonding PP parts with heat welding, or integrating metal inserts (for structural strength). Delivers ready-to-integrate sub-assemblies, saving your production time.

Custom Design Support: Offer 3D mold design and PP prototyping (via injection molding or CNC machining). We produce 20–50 prototype parts in 2–3 days to test PP’s performance (impact resistance, chemical compatibility, fit) and optimize 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.