Address
304 North Cardinal St.
Dorchester Center, MA 02124
Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM
Topworks Plastic Mold — Huangyan, Taizhou, China
Custom Injection Molds and Molded Parts, Built for Overseas Buyers
We design molds, cut steel, and run production in one place. You send a drawing. We review it for manufacturing, quote the tool and the parts, and ship finished parts to buyers in the United States, Europe, and Australia. No trading layer, no handoff between shops.
What We Do
Mold Design and DFM Review
Wall thickness, draft, ribs, undercuts, gate position, and venting are checked before steel is cut. Problems found here cost nothing. Problems found at T1 cost weeks.
Prototyping
Prototype parts confirm fit, feel, and function before tooling starts. A prototype that fails is cheap. A mold that fails is not.
Mold Tooling
Single-cavity and multi-cavity tools, cold runner and hot runner, slides, lifters, and collapsible cores for undercut parts. Steel is chosen for your resin, volume, and mold life.
Injection Molding
Production runs on the quoted press size, with the process window set from the mold trial — not guessed from a datasheet.
How a Project Runs
- Send your drawing and RFQ. 3D file, 2D drawing, resin, annual volume, and cosmetic rules. Mark every undercut and every surface that matters.
- DFM review and quote. We flag design risks, name the mechanism for each undercut, and quote tooling and unit price separately.
- Mold design and steel. Gate, runner, cooling, and ejection are laid out for your part, not copied from the last job.
- T1 trial and first-article check. Trial parts are measured against the drawing before the mold is approved for production.
- Production. Parts run to the approved process window, with the same settings shot to shot.
- Inspection, packing, and shipping. Parts are checked, packed for export, and shipped with the documents your customs broker needs.
Before Steel Is Cut, Check These
Most mold problems are design problems that reached the tool shop too late. Ask your supplier about each item below before approving a mold design.
- Undercuts: which mechanism releases each one, and what it adds to tool cost — see lifters, slides, and collapsible cores compared on cost.
- Gate vestige: where the gate sits, what mark it leaves, and the maximum height allowed — see gate vestige control for cosmetic parts.
- Machine fit: projected area, cavity pressure, and margin behind the quoted tonnage — see clamping force calculation.
- Steel choice, cooling layout, and ejection plan for your resin and volume.
Latest Technical Articles
Injection Molding Undercuts: Lifters, Slides, and Collapsible Cores Compared on Cost — three mechanisms compared on tooling, cycle time, and upkeep.
Clamping Force Calculation: How to Size the Right Injection Molding Machine — projected area, cavity pressure, margin, and machine fit.
Gate Vestige Control: Keeping Cosmetic Parts Clean After Degating — gate placement, gate types, and trimming rules.
What Buyers Say
“All plastic parts are perfect. We are delighted, and there are good chances to continue our relationship for any coming new project.” — Cristiano, Products Developer
“Steven is an excellent professional with great knowledge and technical practice.” — Paulo
“Steven is a very detail-oriented project manager and engineer who can solve problems creatively and also provides excellent service.” — David, Business CEO
Send Your Part Drawing
Tell us the resin, the volume, and the surfaces that matter. We will name the mechanism for each undercut, the tooling adder, and the cycle effect before steel is cut.
Business: Topworks injection mould. Hours: Monday to Sunday, 09:00–17:00.