Eight problems and how they were solved
Each entry is one specific order: the problem first, then what was changed, then a result you can check.
Case 01 · Appliance component supplier · flexible PVC
Off-centre wall fixed — first-pass assembly yield 92% → above 99%
- Requirement
- Flexible PVC tube, 8 mm OD × 6 mm ID × 120 mm, 30,000 pcs per month, for a seal in an appliance component.
- Problem
- The previous supplier’s tube had an off-centre wall, so the seal did not compress properly and the customer’s line carried a high rework rate. The cut ends also had burrs that needed manual trimming.
- What we changed
- Adjusted the sizing sleeve and the vacuum level to hold wall eccentricity within 0.15 mm, and changed fixed-length cutting to a process that deburrs the cut face.
- Result
- First-pass assembly yield rose from 92% to above 99%, and the customer removed the 100% inspection station.
- Key parameters
- 8 mm OD × 6 mm ID × 120 mm · 30,000 pcs/month · eccentricity ≤ 0.15 mm
Case 02 · Small appliance manufacturer · PE, dual-layer co-extrusion
Dual-layer co-extruded tube approved in a single sampling round
- Requirement
- Dual-layer tube, 10 mm OD × 7.6 mm ID; the outer layer carries an antimicrobial additive; 150,000 m per month.
- Problem
- The two layers need different properties — a soft inner layer and a functional outer layer. A single-layer die cannot produce that; the two flow paths have to be combined inside the die.
- What we changed
- Built a new dual-layer co-extrusion die, with the inner and outer layers metered and temperature-controlled independently.
- Result
- The first sample was approved in one round and the part went straight into volume production.
- Key parameters
- 10 mm OD × 7.6 mm ID · 150,000 m/month · dual-layer co-extrusion
Case 03 · Fire-safety equipment manufacturer · rigid PVC profile
0.8 mm thinnest wall across complex sections, flame rating UL 94 V-0
- Requirement
- Several complex PVC profile cross-sections, 18 tonnes per year, with a flame rating required to reach UL 94 V-0.
- Problem
- The thinnest wall is 0.8 mm. Material flows fast in a wall that thin and starves easily, and a standard PVC compound does not reach V-0 at that wall thickness.
- What we changed
- Developed a modified PVC compound that satisfies both the flame rating and the filling requirement of the thin sections.
- Result
- The product was tested to UL 94 and reached V-0, passed customer acceptance, and moved into series supply.
- Key parameters
- multiple complex cross-sections · 0.8 mm thinnest wall · 18 t/year · UL 94 V-0
Case 04 · Toy component manufacturer · PE / PP
Four-cavity die plus high-speed cutting brought the unit cost down
- Requirement
- PE / PP small tube, 3.3 mm OD, cut to 10 mm, 200 kg per month.
- Problem
- Two problems compounded. The existing die produced too little per hour, which pushed the unit cost up; and a standard cutter cannot cut a 10 mm length cleanly — the cut face came out uneven.
- What we changed
- Built a new four-cavity extrusion die to run four tubes at once, and added a high-speed cutter whose cycle keeps up with the line speed.
- Result
- Output went up and unit cost came down, with wall-thickness consistency improving at the same time. The shortest length we now cut is 2 mm.
- Key parameters
- 3.3 mm OD · 10 mm cut length · four cavities · 200 kg/month
Case 05 · Straw trader, export channel · PC with gold powder
Gold-powder PC straws — removing surface agglomeration and sink marks
- Requirement
- PC straw with a gold-powder effect, 8 mm OD × 6.6 mm ID × 230 mm, 50,000 pcs per month.
- Problem
- The metallic look depends on the powder being evenly distributed through the wall. With the usual colorant-plus-gold-powder ratio, the surface showed agglomerated specks and local sink marks.
- What we changed
- Re-balanced the gold-powder ratio, ground the powder to a finer particle size, and extended the mixing time so the powder disperses more evenly in the compound.
- Result
- Even distribution with no agglomeration; the part went into volume production. The customer reported that the item performed well in its category on Amazon.
- Key parameters
- 8 mm OD × 6.6 mm ID × 230 mm · 50,000 pcs/month · PC + gold powder
Case 06 · Medical equipment manufacturer · flexible PVC
Chamfers, a single-side hole and an 80 mm flare — solved as one process
- Requirement
- Flexible PVC tube in several sizes, 500 kg per year. Both ends chamfered, a single-side hole through the wall, and one end flared to an 80 mm length.
- Problem
- All three operations sit beyond standard equipment. A standard chamfering machine cannot hold a soft tube without deforming it; a standard punch only makes through-holes in rigid tube and collapses an unsupported single-side hole; and an 80 mm flare is beyond a standard flaring die.
- What we changed
- Worked with an equipment maker to develop a hot-head chamfering machine that handles both rigid and soft tube, added a new cutting die to the punching machine that cuts soft tube with a heated blade so the cut face stays clean, and built a dedicated die for the flare with the heat-setting time established over several trials.
- Result
- All three operations qualified and the part passed customer acceptance.
- Key parameters
- several sizes · both ends chamfered · single-side hole · 80 mm flare · 500 kg/year
Case 07 · Pet product manufacturer · flexible PVC
Thick-wall flexible PVC tube with a smooth bore
- Requirement
- Thick-wall flexible PVC tube, 38 mm OD × 30 mm ID × 300 mm, first order 500 pcs.
- Problem
- A thick-wall flexible PVC tube is hard to bring to a smooth bore; a soft compound has little rigidity, and the thicker the wall the harder the bore is to control.
- What we changed
- Developed a new modified PVC compound to replace the original material and re-ran the tooling trials.
- Result
- A thick-wall flexible PVC tube with a smooth bore was developed and confirmed by the customer.
- Key parameters
- 38 mm OD × 30 mm ID × 300 mm · first order 500 pcs
Case 08 · Drone assembly manufacturer · material and colour confirmed per airframe
Arm routing tube: 10 mm width in two cut lengths, adhesive backing applied
- Requirement
- Black routing tube, 10 mm wide, in two lengths: 10 × 85 mm and 10 × 130 mm, protecting the harness run between the main body and the wing. Double-sided tape on the back so the tube bonds to the inside of the arm and frame.
- Problem
- The folding arm leaves little room and the harness has to follow the fold. The tube must shield the wires from the carbon-fibre plate edge without standing proud enough to interfere with folding. The two lengths serve different airframes, and the customer was dispensing adhesive onto every piece by hand — slow, and hard to place consistently.
- What we changed
- Cut to the two fixed lengths, 85 mm and 130 mm, with deburred ends; laminated double-sided tape with a release liner onto the back so the part is peel-and-stick out of the box, removing the customer’s dispensing station.
- Result
- Both lengths went into series supply. The same section can be adjusted in length, width and wall thickness for a new airframe’s routing path.
- Key parameters
- 10 mm width × 85 / 130 mm length · adhesive backing · length, width and thickness made to drawing
Drone harness tube (routing tube): standard sizes and what can be customised
Shenzhen Weiheng Plastic Products Co., Ltd. extrudes harness tubing for drone assembly — routing tube, wire channel, harness protector. Two sizes are standard: 10 × 85 mm and 10 × 130 mm (10 mm width, 85 mm and 130 mm long), with double-sided tape on the back, for protecting the harness run between the main body and the wing.
Those two sizes are regular items, not a capability limit. The same flat tube can be made to drawing: length, width and wall thickness are all adjustable; colour and stiffness are chosen to suit the airframe; ends can be square-cut or deburred; and the adhesive is selected for the surface it bonds to.
Three things are enough to assess feasibility: (1) how many wires and the maximum bundle diameter; (2) the usable length and width at the mounting point; (3) whether the bonding surface is carbon-fibre plate, plastic or metal. Send the cross-section drawing or a sample and we will confirm the process first, then quote MOQ and lead time against the size, tooling and quantity. Quotations are tax-inclusive; freight is charged separately at the actual carrier rate.
