Why the ABS liner/drawer set is five problems in one tool

• 0.4–0.7% Shrink On A 1.2 m Deep-Draw Box Is A 3D Compensation Problem, Not A Scale Factor. ABS shrinks 0.4–0.7% (junhuimould page datum), but flow-direction vs transverse-direction differ by ~0.1% on a long liner wall. A naive "cavity = part × 1.005" scales the box uniformly and the flange comes out 1.5 mm too small on the flow axis, 0.8 mm on the transverse—door won't close. JH Mold runs Moldflow with the actual gate location, predicts the anisotropic shrink map, and cuts the cavity with a 3-axis compensation mesh (longer axis ×1.006, transverse ×1.004, corners relaxed). The 0.7 mm minimum wall is the lower bound: below that the liner short-fills at the deep corner; above 2.5 mm the crisper rail sinks. The DFM report states wall 0.7–2.5 mm, radius 0.5 mm min, rib thickness 60% of wall—same rules as a beauty shell but at 20× linear scale.

• Fixed Half 5℃ Hotter Than Moving Half Kills High-Gloss Silver Streak. The junhuimould processing note is explicit: "fixed mold temperature is usually about 5℃ higher than the moving mold to ensure surface quality," 60–80℃ for high-gloss liner, 50–60℃ for structural. Reason: the fixed (cavity) half contacts the melt first and sets the skin; if it is colder than the moving (core) half, the skin freezes before the core packs, leaving silver streaks and a dull finish on the visible liner face. On a door-liner deco panel that will be electroplated or piano-black painted, a 3℃ delta is the difference between first-shot accept and 200 scrap shots. The temp delta is not a process tip, it is a cooling-channel design constraint: fixed half gets tighter baffle spacing, moving half gets wider.

• Hot-Runner Valve Gate Erases Weld Line On 1.2 m Door Liner; Pin Gate Would Scar It. A refrigerator door liner is a flat-ish 0.9×0.6 m panel with a decorative strip. A cold-runner pin gate at the edge leaves a 3 mm vestige that must be degated and polished—unacceptable on a piano-black face. A hot-runner valve gate (Yudo/Synventive class, though junhuimould lists hot runner or pin gate recommended) injects at the centre or hidden flange, shuts cleanly, and the multi-stage high-speed fill (junhuimould: "medium to high speed, multi-stage high-speed for high-gloss") pushes the two flow fronts to meet at the far edge where the weld line is invisible behind the door gasket. For a drawer face (smaller, 0.4×0.3 m) a pinpoint cold gate is fine; for the liner and door liner, hot-runner valve is the only route to a weld-free Class-A surface. The "hot runner or pin gate recommended" line on the page is material-independent: it means "part size decides, not resin."

• P20/718H + SPC Mirror Polish Is A Steel Chain, Not One Steel. Cavity steel P20 (pre-hardened 28–32 HRC) for 300k-shot structural liners; 718H (pre-hardened 30–35 HRC) for 500k–1M drawer faces; SPC mirror polish (not hand buffing) for electroplate-grade drawer fronts where Ra <0.05 μm is mandatory or the chrome pits. The core can be the same steel; the cavity insert is what gets the mirror. JunHui's note "cavity requires high-precision polishing (SPC polishing is required for mirror finish)" means the shop keeps an SPC lapping bench and a profilometer, not a grinder with a felt wheel. A liner mould quoted on "P20, polished" without SPC grade is a structural liner, not a high-gloss one—two different tools.

• 3D → Moldflow → CNC → Trial Is The Appliance-Brand Qualification Gate. JH Mold workflow: 3D part review (UG/PROE) → moldflow shrink/warp prediction → cavity compensation → CNC (5-axis + EDM) → assembly → trial (T1 samples sent to brand QA) → sample confirm → mass production. The trial step is where a global appliance brand spends 4–6 weeks: liner warpage measured on CMM against ±0.05 mm, drawer slide-fit tested on actual rail, PU-foam simulation pressed against liner outer skin to check bulge. No trial, no PO. The junhuimould line "we have successfully provided OEM/ODM services to numerous renowned global home appliance brands" is the residue of that gate—brands don't onboard a mould shop on price, they onboard on T1 warpage data.

• Hubei JunHui / JUN HUI As White-Goods Mould House. Hubei Junhui Mold Co., Ltd. (JH Mold), brand JUN HUI, junhuimould.com, Hubei origin. Not a Shenzhen 3C-enclosure shop pivoting to fridges; a Hubei-based large-mould house (liner/drawer/door panel) sharing the CNC hall with commercial-fridge and automotive-fridge programmes. The same 5-axis centres that cut a 2.8 T liner mould also cut a commercial display-fridge drawer; the moldflow licences, the SPC bench, the 80–90℃ drying ovens are sized for ABS liner volume, not 5k-shot TWS shells. That scale is why a liner mould lead time is 45–60 days, not 4 weeks.

JunHui / junhuimould supply context

• Maker: Hubei Junhui Mold Co., Ltd. (JH Mold), brand JUN HUI; junhuimould.com; origin Hubei, China

• Product: Custom ABS Refrigerator Parts Injection Mold

• Parts covered: Inner liner, door liner, drawer, decorative panel (household / commercial / automotive fridge)

• Resin: ABS (recommend dry 80–90℃ × 2–4 h, moisture <0.1%)

• Process window: Mold temp 50–80℃ (fixed 5℃ > moving; 60–80 high-gloss, 50–60 structural); inj pressure 70–140 MPa; hold 20–60% of inj; back pressure 5–15 MPa; multi-stage medium-high speed

• Shrink: 0.4–0.7% (cavity compensated)

• Runner: Hot runner (valve) for liner/door liner; pin/cold gate for drawer; min wall 0.7 mm

• Steel: P20 / 718H pre-hardened; SPC mirror polish on cavity for high-gloss

• Ejection: Large area, synchronized, no mark on electroplate face

• Life: 300,000 – 1,000,000 shots

• Capability: 3D design (UG/PROE/CAD) → mold flow analysis → CNC precision machining → trial mold validation → OEM/ODM

• URL: https://www.junhuimould.com/product/custom-abs-refrigerator-parts-injection-mold

Key characteristics and application scope

• Product Name: Custom ABS Refrigerator Parts Injection Mold

• Alternate Terms: JunHui JH Mold custom ABS fridge liner drawer door panel mould 0.4-0.7% shrink hot runner P20 718H SPC polish, Hubei JUN HUI refrigerator inner liner injection tool 1M shots, junhuimould.com white-goods ABS mould OEM, household commercial automotive fridge parts mould

• Tool class: Large deep-draw thin-wall high-gloss ABS appliance mould (not 3C enclosure, not automotive bumper, not PET preform)

• Core Applications:

• Household refrigerator inner liner — 1.2 m deep-draw box, 0.7–2.5 mm wall, crisper rail, air-duct boss, PU-foam backface, warpage <0.2 mm/1000 mm

• Door liner / door deco panel — piano-black or electroplate face, hot-runner valve gate, weld line hidden behind gasket

• Crisper / freezer drawer — 718H cavity, SPC mirror polish, slide-fit ±0.1 mm on liner rail

• Decorative panel / trim — texture MT or high-gloss, pin gate acceptable, 300k-shot structural grade

• Commercial / automotive fridge parts — same tool family, thicker wall (2.5–3.5 mm), less gloss demand, P20 steel

• Companion logic: Same JunHui PO pulls liner + drawer + door-liner + deco panel so one moldflow study covers the whole fridge interior, one steel batch, one trial window.