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The primary purpose of T1 is validation and discovery, not perfection. The main objectives are:
Verify Mold Functionality: Does the mold open, close, eject parts, and cycle without issues? We check the gating system, cooling lines, ejection mechanism, and vents.
Obtain First Articles: We produce the first set of samples for initial dimensional, visual, and assembly testing.
Establish a Baseline Process: We find a set of machine parameters that can produce a basically complete part, creating a starting point for future optimization.
Identify and Document Issues: The most critical goal is to uncover any and all problems related to the mold design, product design, or manufacturing process.
A systematic approach is crucial for a productive trial.
Phase 1: Preparation (Before the Mold is Even Installed)
Review Documentation: Have the product drawing, mold design, and material data sheet (MSDS) ready.
Mold Inspection: Check for any shipping damage and ensure all moving components (slides, lifters) work smoothly.
Machine Setup: Select a press with the correct clamp tonnage and prepare it by heating the barrel and setting up mold temperature controllers.
Phase 2: Initial Startup & Parameter Setting
The machine is run in manual mode to perform slow, low-pressure cycles. This "dry cycle" ensures everything moves correctly without plastic. Then, technicians set initial parameters for injection speed, pressure, and temperature based on the material and mold design.
Phase 3: The Core of the Trial: Process Optimization
This is an iterative cycle of Produce, Observe, Analyze, and Adjust. The golden rule: change only one parameter at a time to understand its effect.
Here’s a quick guide to troubleshooting common T1 defects:
| Defect | Likely Cause | Adjustment Direction |
|---|---|---|
| Short Shot (Incomplete Fill) | Low injection speed/pressure, cold mold/material. | Increase injection speed/pressure. Raise mold and melt temperatures. |
| Flash (Excess Material on Parting Line) | Clamp force too low, injection pressure too high. | Increase clamp tonnage. Reduce injection pressure. |
| Sink Marks (Voids on Thick Sections) | Insufficient packing or cooling. | Increase pack/hold pressure and time. Optimize cooling line design. |
| Flow Lines | Material cooling too fast as it flows. | Increase injection speed and melt temperature. |
| Burn Marks | Trapped air (gas) ignites from compression. | Reduce injection speed to allow air to escape. Clean or enlarge vents. |
The typical adjustment sequence is:
Solve Filling Issues: First, ensure the part fills completely without short shots or flash.
Apply Pack/Hold Pressure: Then, address sink marks by optimizing the pack and hold phase to compensate for material shrinkage.
Fine-Tune Appearance: Finally, adjust speeds and temperatures (often using multi-stage injection) to minimize flow lines, weld lines, and other visual defects.
Phase 4: Documentation & Sampling
Once a stable process is achieved, the most important step begins: documentation.
Record Final Parameters: Every temperature, pressure, speed, and time setting is meticulously recorded.
Label and Bag Samples: Multiple samples from a stable cycle are collected and labeled for:
Dimensional Analysis (e.g., using a CMM)
Assembly Validation
Customer Review
After the trial, you should receive a comprehensive report that includes:
Final machine settings (the Process Window)
Photos of the samples, highlighting any defects
A detailed list of discovered issues, categorized as mold, product design, or process-related
Preliminary dimensional data
Recommendations for mold modifications and the need for a T2 trial
View the T1 trial not as a pass/fail test, but as the most valuable learning opportunity in the molding lifecycle. It's the chance to identify issues when they are cheapest and easiest to fix. Clear communication, realistic expectations, and a collaborative spirit between your team and the mold maker will turn the T1 trial into a solid foundation for production success.
