Why a process, not a supplier list
Most problems with containers and storage boxes are decided before production: the wrong material for the food, a lid tolerance nobody wrote down, a declaration that covers the resin but not the finished part, a carton that wastes a layer of the container. A supplier list does not catch those; a process does. Lidwell is a sourcing desk, not a plant. We coordinate vetted partner plants across the Guangdong takeout cluster, the Taizhou and Ningbo household plastics clusters and the Longgang printing cluster near Wenzhou, and run each program through the same seven steps.
The seven steps
- Brief. Items, use, destination market, channel and volume.
- Match. Material, process and partner plant for each item.
- Samples. Real reference models checked against the specification.
- Documents. Food contact declarations and test plan for the market.
- Order. Quantity, route, timelines and inspection confirmed in writing.
- Inspection. In-process and final checks before the lot leaves.
- Shipping. Packing, consolidation, documents and handover.
1. Brief
A useful brief says what the container has to do, not just its size: hot or cold food, reheating, freezing, display, reuse, the delivery bag or shelf it must fit, the destination market and the channel. Add an annual volume estimate and the parts you want branded. The sizing guide helps turn a menu or a product range into capacities.
2. Match
The desk matches each item to a material and process first and a partner plant second. Hot takeout goes to PP, thermoformed in Guangdong or injection molded; cold fruit display to clear PET; storage boxes and vacuum containers to injection plants in Taizhou or Ningbo; printed bakery and gift boxes to Longgang. PVC is considered only for non-heated packaging such as gift box windows and organizer cases. The shortlist comes back with real reference models, their sizes in mm, capacities and gram weights, and the route and typical minimum for each.
3. Samples
Stock samples take 3-7 working days and printed samples 7-15 working days, then travel by courier in about 5-8 days. Before they leave, the desk checks size, gram weight, lid fit and, for food ware, a tilt test with liquid. A new mold goes through a T1 trial in about 25-45 days, corrections and a golden sample signed by both sides, which becomes the reference for every later lot.
4. Documents
Documents are matched to the market: supplier declarations to FDA 21 CFR 177.1520 for PP in the United States, declarations of compliance to EU 1935/2004 and 10/2011 with a migration report for Europe, GB 4806.7-2023 for China, and state PFAS rules for paper and fibre packaging in the US. Declarations and reports are issued to partner plants or to your brand per project and verified by the desk. See the compliance guide.
5. Order
The order confirmation fixes quantity, route, material per part, gram weight tolerance, lid fit, print reference, packing specification, carton marks, inspection plan, documents, timelines and shipping terms. Changes after approval are confirmed again in writing.
Gram weight deserves its own line. It is the clearest sign of wall thickness, and a quiet reduction of a gram or two per piece is the most common way a container drifts from the approved sample. The confirmation states the reference weight from the golden sample and the tolerance, so it can be checked at inspection rather than argued about after a complaint. The same logic applies to the lid: the confirmation names which lid closes which base, so mixed capacities on one footprint stay interchangeable across repeat orders. Partner plant audits behind this step are described in factory audit.
6. Inspection
Checks run in process and before shipment against the agreed plan. The table lists the usual checkpoints; numbers of samples and pass criteria are stated working defaults, confirmed per order.
| Stage | Checks | Reference |
|---|---|---|
| Sample | Size, gram weight, lid fit, tilt test, odor | Specification |
| In process | First articles, wall thickness, print color | Golden sample |
| Final | Visual defects, lid fit, tilt and drop, freezer or microwave per marking, carton count | Inspection plan |
| Packing | Sleeve count, carton marks, carton stacking | Packing specification |
Details are in testing and inspection.
7. Shipping
Goods from several plants are consolidated, carton marks are checked against the packing list and the shipment leaves FCL or LCL with a clean document set. Findings, golden samples and reports stay in the program file, so a repeat order starts from where the last one ended. See logistics and shipping and MOQ and lead time.