DOWNLOAD AHS AHERACTIVE AND THE LATEST OFFERS ARE AT YOUR FINGERTIPS.

MOTEK
CHINA

End-to-end plastic chair mould solutions

From design to volume
One closed loop for every chair

Precision injection tools for dining, beach, office, rattan and gas-assist chairs. Hot runners, cooling layout and interchangeable inserts help you hit 35–55 s cycles and 0.5–1 million shot life.

√ 200+

√ Chair mould projects

√ 1,000,000

√ Shot life potential

√ ±0.05mm

√ Critical tolerance

√ 30+

√ Export markets

Application Mastery

Tailored Chair Mold Solutions

Whether you produce mass-market stackable monoblock chairs or ergonomic luxury office furniture, Motek designs molds with optimized parting lines and conformal cooling.

Monobloc Stackable Chairs

Specialized single-injection or gas-assist molds designed for maximum stacking stability and minimal wall thickness variation.

Rattan / Leisure Beach Chairs

Intricate texture engraving via CNC & EDM laser texturing to produce realistic rattan weave patterns without demolding friction.

Office & Shell Chairs

Engineered for PP/ABS engineering plastics with slider mechanisms for undercuts, armrest slots, and sleek curved contours.

Designer Barstools

Deep cavity design with robust ejection systems to prevent deformation during rapid cooling of high stools and curved seats.

Workflow

Custom Chair Mold Development Process

From initial 3D conceptualization to final trial shot testing in our high-tonnage injection machines, our streamlined 5-stage process ensures total transparency.

Communication of requirements

Discuss the product dimensions, structure, appearance, material, mold steel requirements, injection machine tonnage, and other key information needed for product design.

Step 1

Technical Drawing Approval

The documents to be confirmed include: product 3D drawings, mold drawings, and any related drawings required for mold flow analysis, if applicable.

Step 2

Custom Materials & Mold Processing

Prepare the required steel according to customization needs, and arrange mold processing such as CNC machining, EDM, deep-hole cooling, polishing and texturing, as well as steel heat treatment.

Step 3

Trial Sample Approval

Conduct trial molding and send samples to the customer for confirmation, and keep improving the mold until the customer approves it as qualified.

Step 4

Shipment and Delivery

Prepare the mold 2D/3D drawings, inspection reports, etc., and customize wooden crates as required, arrange booking, and confirm the shipping schedule.

Step 5

After-sales Follow-up Service

Provide services such as rapid response, technical support, repair and maintenance, and spare parts supply for customers' mold usage.

Step 6

Engineering

The success or failure of a plastic chair mold lies in every detail.

With a large projected area, many ribs, and uneven wall thickness, mold life and chair strength depend on the coordinated design of steel, cooling, gates, and vents.

√ Place the gate at the center of the seat so all four legs fill simultaneously and short shots disappear.

√ Keep the main wall at 3–4.5 mm and ribs under 0.6× the wall thickness to control sink marks.

√ Hot runners reduce cold scrap and gate trimming, often cutting cycle time by 10–20%.

√ Smooth parting and proper venting prevent flash and burn marks.

√ Interchangeable back inserts let one base tool run multiple textures.

√ Gas assist for thick arms and art chairs lowers clamp force and residual stress.

Spec Sheet

Configurable Mould Parameters

Typical ranges only. Final build follows part size, resin grade and target output. Part size determines mold structure and machine tonnage; resin grade determines steel and runner system; target output determines tool life and steel grade. Cooling, surface finish, lead time and budget should also be confirmed together.

Item	Options / Values	Notes
Cavity / Core Steel	P20, 718H, 2738, NAK80, H13, S136	Selected by tool life and polish requirements
Cavity / Core Hardness	Pre-hardened steel HRC 30–35; Heat-treated steel HRC 48–52	Directly affects wear resistance and mold life
Mold Base	LKM / HASCO / DME / MISUMI	LKM S50C or P20 are common choices
Runner System	Hot runner (pin-point gate) / Cold runner	Hot runner is common for chairs to reduce cold scrap and improve efficiency
Number of Cavities	Single cavity (large chairs) / Multi-cavity (stools)	Large chairs are usually 1-cavity; small parts can be multi-cavity
Resins	PP, HDPE, ABS, PC, regrind	PP is commonly used for chairs; UV-stable PP required outdoors; glass-filled resins need wear-resistant steel
Tool Life	300,000 – 1,000,000 shots	P20 approx. 200,000–300,000; 2738/heat-treated steel can reach 600,000–1,000,000
Cycle Time	35 – 70 s	1.3–2.5 kg chairs: 45–66 s on standard machines; 35–50 s on high-efficiency machines
Injection Machine Tonnage	650T – 1650T	Standard chairs approx. 850T; PC chairs / gas-assist chairs require 1350T+
Clamp Force Check	Projected area × cavity pressure (350–500 kg/cm²) × 1.17 safety factor	Must exceed the parting force; insufficient clamp force causes flash
Surface Finish	Mirror / grain / rattan EDM	Parting line should be smooth to the touch
Corrosion Consideration	PVC/POM/PBT and other corrosive resins require S136, 2316	Halogen-containing or acidic plastics require stainless steel molds
CAD / CAE	UG, SolidWorks, Pro/E, AutoCAD, Moldflow	Fill and cooling studies completed before steel is cut