- Part tolerances reviewed by geometry and resin
- Low Volume Production
- Prototype and bridge-tooling options
- DFM Feedback
- Tooling and production lead times quoted by project
CNCMAVEN supports custom injection molding from DFM review and mold planning through sampling, inspection, and production. Send the part drawing, 3D model, resin requirement, color or finish, estimated annual volume, and inspection needs for a project-specific review.
Injection Molding Processes
Injection molding is best suited to repeat production of resin parts whose geometry is designed for filling, cooling, and ejection. Material selection, wall thickness, draft, ribs, bosses, undercuts, gate location, and cosmetic requirements should be reviewed before the mold is released.
Blow Molding
Blow molding involves clamping molten thermoplastic material into a mold and blowing air into it to expand against the mold cavity walls. After cooling and solidifying, the desired product shape is formed.
Compression Molding
Compression molding is mainly for molding thermosetting plastics and comes in two types: compression molding and transfer molding, which vary based on material characteristics and processing equipment.
Insert Molding
Insert molding refers to a molding process where a pre-prepared insert of a different material is placed into a mold, and then resin is injected. The molten material bonds and solidifies with the insert, resulting in a single integrated product.
Two Shot Molding
Two-shot molding forms two materials or colors in a coordinated molding cycle. It can combine rigid and soft-touch features, but resin compatibility, tool design, and production volume determine whether it is practical.
Nano Injection Molding
Nano molding joins selected metals and thermoplastics after a controlled metal-surface treatment. The metal alloy, resin, pretreatment, bonding target, and validation method must be evaluated for the application.
Overmolding
Overmolding forms a second resin or elastomer layer over a molded substrate or insert. Material compatibility, shutoff geometry, adhesion, and part handling must be confirmed during DFM.
Injection Molding
Injection molding feeds granular or powdered raw material into an injection machine's hopper, where it's heated and melted. The molten material is then injected into the mold cavity through the nozzle and gating system, solidifying to form the desired shape.
Rotational Molding
Rotational molding involves adding plastic raw materials into a mold, which rotates along two perpendicular axes while being heated. This process allows the plastic to coat the entire mold surface evenly, forming the desired shape.
Structural Foam Molding
It is a manufacturing process that injects a gas into melted plastic resin to create lightweight, strong parts with a foamed core. It's used to produce large, thick-walled components with excellent strength and dimensional stability, commonly found in automotive and construction industries.
Extrusion Molding
Extrusion molding is mainly used for molding thermoplastic materials. It involves melting the material and pushing it through a shaped opening using a rotating screw. After shaping, the material is cooled and hardened to produce the final product.
Dip Molding
Dip molding uses the flowability of thermoplastic polymers under specific conditions, allowing them to be shaped into desired forms through jetting and solidification at room temperature using specialized tools and methods.
Thermoforming
Thermoforming, also known as vacuum forming, is a method where sheet materials are heated, vacuumed onto a mold, and cooled to create plastic products.
Injection Molding
Also known as injection-compression molding, utilizes the pressure of an injection molding machine to directly inject preheated rubber material from the barrel through a nozzle into the mold cavity, where it undergoes vulcanization to form the desired shape.
Compression Molding
Rubber compression molding places preprocessed rubber materials into an open mold cavity, which is then closed and subjected to pressure and heat in a vulcanizing press. This process causes the rubber to vulcanize and take shape.
Transfer Molding
Transfer molding, also called transfer compression or potting molding, places preprocessed rubber strips or blocks into a transfer mold cavity. The rubber is compressed by the transfer plunger and forced into the mold cavity through the gating system for vulcanization and shaping.
Extrusion Molding
Rubber extrusion molding heats and plasticizes rubber material in an extruder, pushing it forward with a screw or plunger. It then extrudes various semi-finished products using a rubber extrusion mold to complete the forming process.
Injection Molding Materials
Choose an injection-molding material from the part’s mechanical, thermal, chemical, cosmetic, regulatory, and cost requirements—not from resin name alone. Common options include ABS, PC, PP, PE, PA, POM, TPE, and TPU; filled grades, flame ratings, UV exposure, color, shrinkage, and moisture sensitivity can change both part and mold design.
- Polymethyl Methacrylate (PMMA)
- Acrylonitrile Butadiene Styrene (ABS)
- Nylon Polyamide (PA)
- Polycarbonate (PC)
- Polyethylene (PE)
- Polyoxymethylene (POM)
- Polypropylene (PP)
- Polystyrene (PS)
- Thermoplastic Elastomer (TPE)
- Thermoplastic Polyurethane (TPU)
- Polyvinyl Chloride (PVC)
- Polyethersulfone (PES)
- Polyethylene Terephthalate (PET)
- PA6 Polyamide 6
- Polybutylene Terephthalate (PBT)
- High-Density Polyethylene (HDPE)
- Polyethylene Terephthalate Glycol (PETG)
- Polyether Ether Ketone (PEEK)
- Low Density Polyethylene (LDPE)
- High Impact Polystyrene (HIPS)
- Silicone
- Liquid Silicone Rubber (LSR)
- PC-PBT
- Teflon (PTFE)
- Polylactic Acid (PLA)
- Polyetherimide (PEI)
- Polyphenylene Oxide (PPO)
- Polyphenylsulfone (PPSU)
- Styrene-Butadiene Copolymer (SBC)
Injection Molding Capabilities
| Capability | Project-Specific Details |
|---|---|
| MOQ | Prototype, bridge, and production quantities reviewed by tooling and unit-cost target |
| Mold plan | Tool material, cavity count, gate, runner, cooling, ejection, texture, and expected tool life reviewed before release |
| DFM inputs | 3D model, drawing, resin and grade, color, finish, critical dimensions, annual volume, and inspection requirements |
| Quality plan | Material verification, first-article approval, dimensional inspection, appearance criteria, and production sampling agreed by project |
| Lead time | Quoted after DFM, mold complexity, resin availability, sampling rounds, and order quantity are confirmed |
Every quotation should separate mold scope, sampling, and production parts. Before tooling starts, confirm resin grade, shrinkage assumptions, cavity count, gate and parting-line constraints, cosmetic surfaces, critical dimensions, inspection method, packaging, and the expected order profile.
Defined Inspection Plan
Tooling Matched to Volume
Critical Dimensions Identified
Resin Grade Confirmed
Complex Geometry Reviewed
Cost Drivers Made Clear
Quality Records by Project
Part Size Checked Against Equipment
Injection Molding Applications
Automotive
- Dashboards - Bumpers - Body panels - Door panels - Trim components (interior and exterior) - Grilles - HVAC vents - Engine covers - Wheel arch liners - Underbody shields - Lighting components (headlamp housings, taillight lenses) - Airbag covers - Armrests - Cup holders - Center console components - Battery enclosures - Fuel tank components - Exterior mirror housings - Roof racks - Mud flaps
Food Industry
- Water cups - Drink bottles - Trays - Containers - Lids - Utensils (forks, spoons, knives) - Food packaging components (caps, closures) - Dispensing equipment parts - Food processing machinery components - Customized molds for specialty food products
Electronics
- Circuit board components (enclosures, holders, connectors) - Keyboards (keycaps, keyframes) - Mice (housing, buttons) - Laptop and Tablet cases - Smartphone cases and covers - Wearable device components (watch bands, fitness tracker casings) - Audio equipment components (speaker housings, control knobs) - Camera components (lens caps, camera bodies)
Medical
Diagnostic housings, laboratory consumable components, device enclosures, caps, connectors, and non-implant plastic parts, subject to material, cleanliness, traceability, and regulatory requirements defined by the customer.
Robotics
- Robot frames and casings - Grippers and end-effectors - Joint covers and protective shields - Sensor housings and mounts - Encoders and feedback devices - Motor mounts and brackets - Control panels and interface panels - Display bezels and covers - Battery enclosures and holders - Camera housings and mounts - Armature components for robotic arms - Electrical connectors and terminals - Base plates and mounting brackets
Building Products
Fasteners, anchors, electrical boxes, protective covers, drainage fittings, hardware housings, and other repeat molded components designed for the required weather, flame, load, and installation conditions.
Injection Molding FAQs
Injection molding melts a specified resin, injects it into a closed mold, cools the part, and ejects it for repeat production. It is usually selected when expected volume justifies tooling and the design can be molded consistently.
Some limitations include high initial tooling costs, limitations in part size and thickness, and the need for careful design considerations to avoid defects like warping or sink marks.
Cost is driven by part geometry, resin and additives, mold material, cavity count, sliders or lifters, gate and runner design, texture, tolerance and inspection needs, sampling rounds, and order volume. A useful RFQ includes the 3D model, drawing, resin grade, annual volume, and quality requirements.
Lead time should be quoted after DFM because mold complexity, steel and component availability, machining, texture, sampling rounds, resin availability, inspection, and production quantity all affect the schedule. Ask for tooling, T0/T1 sample, approval, and production milestones separately.
Use consistent walls where practical, add suitable draft, support bosses and ribs, reduce avoidable undercuts, and identify acceptable gate, parting-line, ejector, weld-line, and sink-mark locations. Mark critical dimensions and cosmetic surfaces on the drawing for DFM review.
The quality plan can include resin and color verification, first-article approval, dimensional inspection of critical features, visual defect criteria, functional checks, process records, and agreed production sampling. Specify required reports in the RFQ.
Yes. Specify a color standard or approved sample, resin grade, texture or SPI-style finish target where applicable, gloss range, and any appearance limits. Color and surface results should be approved on molded samples before production.
Maximum part size depends on projected area, shot size, mold dimensions, clamp force, resin, wall thickness, and geometry. Send the 3D model and expected volume so the supplier can confirm equipment fit.
Injection molding is usually favored for repeat resin parts when tooling cost can be spread across volume. CNC machining is often better for prototypes, low quantities, or geometry that is difficult to mold. The decision should compare tooling, unit cost, material, tolerances, lead time, and expected lifetime volume.
Include a 3D model and drawing, resin and grade, color and finish, critical dimensions, annual and order quantities, expected product life, mating or functional requirements, inspection documents, packaging, and target schedule.