Plastics Assembly

From Manual Assembly to Million-Piece Automation.

Texas Injection Molding turns molded components into finished, packaged assemblies — with assembly, sonic welding, printing, decoration, and custom packaging supported in the same Houston facility that molds the parts. Dedicated DFA teams and automation engineering help match the right labor, tooling, and automation strategy to your program volume, from hand-built assemblies to high-volume automated solutions.

A Molded Part Is Not Always a Finished Product

Between the part that leaves the press and the product your customer receives, there are often additional steps such as assembly, welding, printing, decoration, packaging, or labeling. When those operations are spread across multiple vendors, they can add freight costs, lead time, quality handoffs, and accountability gaps.

Texas Injection Molding keeps these value-added operations close to the molding process. Our DFA support helps determine the right mix of manual assembly, fixturing, semi-automation, or full automation, while services like sonic welding, printing, decoration, secondary machining, and custom packaging can be performed alongside our molding operations.

We also focus on maximizing the value of every labor dollar invested. When labor is required at the press, we look for ways to use that cycle time productively through inspection, trimming, assembly, or packaging-related work — helping reduce handling, improve efficiency, and lower overall production cost.

Molding, assembly, decoration, and packaging in one facility

Complete Assembly & Decoration Capabilities

Every operation between the molding press and the shipping dock — delivered by the team that made the parts.

Manual Assembly: Skilled hand assembly for low-volume, high-complexity, or early-stage programs where automation is not yet justified.

Semi-Automated Assembly: Fixtured stations and assist systems that pair operator judgment with repeatable process control — the mid-volume sweet spot.

High-Volume Automation: Fully automated solutions engineered for larger-volume programs that require consistent throughput, reduced handling, and documented quality.

Sonic Welding: Ultrasonic joining for strong, clean, fastener-free assemblies — integrated directly into the production flow.

Printing & Decoration: Plastic printing and part decoration completed in-house — branding, marking, and finishing without an outside decorator.

Custom Packaging: Application-specific packaging engineered for protection in transit and efficiency on your receiving end — kitted, labeled, packed, or line-ready.

Automation Sized to the Program — Not the Other Way Around

The right level of automation is a calculation, not a reflex. Our engineering team makes that decision deliberately for every program.

Volume-Matched Solutions: Manual, semi-automated, or fully automated — selected based on real volumes, part complexity, labor content, and timeline.

DFA From the Design Stage: Dedicated DFA teams engineer the product for efficient assembly before production starts — fewer operations, fewer failure points, and lower cost per unit.

Labor Efficiency at the Press: When operators are needed during molding, we look for opportunities to use that cycle time productively — completing assembly, inspection, packaging preparation, or other value-added steps while the part is being produced.

Cross-Operation Engineering: Automation engineers collaborate across molding, assembly, decoration, and packaging — applying proven solutions to new programs rather than reinventing each process from scratch.

Why DFA Pays for Itself

A product designed without assembly in mind can accumulate unnecessary cost through extra fasteners, awkward orientations, excess handling, or labor steps that could have been eliminated early. Our DFA teams engage at the design stage to simplify joins, consolidate parts where practical, improve ergonomics, and align the assembly method with the program’s expected volume.

Every unnecessary operation removed from the assembly process is cost avoided on every unit for the life of the program. Better DFA helps reduce complexity, improve repeatability, and create a more efficient assembly process.

Over-Automating Is as Expensive as Under-Automating

A fully automated cell on a low-volume program may be capital that never pays back. Manual assembly on a high-volume program may become a throughput ceiling and a labor cost that compounds.

Our automation engineers evaluate the entire spectrum — from hand assembly and fixtured workstations to semi-automated systems and high-volume automation — so we can recommend where your program belongs on that spectrum.

Why Choose Texas Injection Molding?

One facility that can take your product from resin to molded component to finished, packaged assembly — with the engineering discipline to do it at the right volume and cost structure.

DFA Second to None

Dedicated teams that engineer your product for efficient assembly from the first design conversation — helping build savings into the program before the first unit is made.

Manual to High-Volume Automation

The full assembly spectrum under one engineering team — so your program lands at the level its volume, complexity, and economics actually justify.

Finished, Not Almost-Finished

Sonic welding, printing, decoration, machining, and packaging in-house — products move forward customer-ready, line-ready, or distribution-ready, with fewer outside vendors.

One Quality System Throughout

Molding, assembly, and decoration governed by the same ISO 9001:2015 certification — reducing quality handoffs between operations.

Every Vendor You Remove Is Risk You Remove

A supply chain that runs molder-to-assembler-to-decorator-to-packager can create multiple quality systems, freight legs, handoffs, and opportunities for delay or finger-pointing. Texas Injection Molding collapses those operations into one coordinated manufacturing flow — one engineering team, one quality system, and one accountable partner from resin to packaged product.

Send us your assembly requirements. Our engineers will review the design, recommend the right labor or automation approach, and return a detailed quote — typically within 48 hours, with a free DFA review included.

Get Your Assembly & Decoration Quote — Free DFA Review Included

Send us your product requirements and volume targets. Our engineering team will review the assembly, decoration, packaging, and labor requirements; recommend the right manual, semi-automated, or automated approach; and return a detailed quote — typically within 48 hours.