A second 200-ton compression molding press went into service at our Gaobu workshop in late August, and by mid-September it was holding a steady cycle on the 6 mm shell used across the tool case line. The tooling shop had been waiting on it since spring. Two older presses were running 14-hour days to cover a run of insulin cooling cases and a repeat order of drone cases for a German distributor, and the queue for new molds had stretched past four weeks.
What the new press changes on the floor
Cycle time on a 320 x 240 x 90 mm shell came down from roughly 165 seconds to about 120 seconds once the platen settled at 175 °C (347 °F). That number is off the line log after three weeks of running the same tool on both machines, not off a spec sheet. The more useful change is consistency. Wall thickness on the older presses varied by about 0.4 mm around deep corners, which later shows up as a lid that sits proud by a hair. On the new press the spread is closer to 0.15 mm, and the trimming operators spend less time with a knife. The extra capacity goes first to our EVA case range.
A shipment to Rotterdam and what it had to pass
The first full order off the new press was 3,000 two-layer tool cases for a Netherlands importer, packed 12 per carton and shipped out of Yantian in the second week of September. Before loading, the cartons went through the drop sequence in ISTA 2A: 1.0 m onto concrete, six faces, three drops each, plus a vibration run. Two shells in the batch showed corner whitening on the second face, and the molding team traced it to a 10 °C dip in the platen overnight when the workshop power cycled. The fix was unglamorous: a longer preheat before the first shot of the day, written into every setup card. The same shells are running again on our EVA tool case line with the revised card.
Sampling, materials and the next bottleneck
Sampling still runs at about three days for a straightforward shape with a die-cut foam insert. Complex builds take longer, usually seven to ten days. An insulin cooling case with a gel pocket, or a vanity case with an aluminum frame and a mirror panel, gets its foam cut and fitted twice. Most shells use EVA sheet at 0.18 to 0.22 g/cm³ with Shore C hardness between 45 and 65. Softer than that and the shell slumps at the corners after a few hundred open-close cycles; harder and it transmits impact instead of absorbing it.
Buyers who want to see how the shells are made can walk the floor. The Gaobu site covers more than 10,000 m² with six lines and a little over 100 people across two shifts, and the two stops that answer most questions are the molding bay and the QA bench. Set a date through the contact page or write to lucy@lianpingbag.com.
Next on the schedule is a second incoming-material bench. The current one checks RoHS and REACH documentation for every resin lot and retains samples for twelve months, and with the extra press throughput it has become the bottleneck instead of the molding bay. Ms. Chen, who runs incoming inspection, has asked for a second set of calipers and a dedicated shelf before the quarter is out.