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Professional Zinc Alloy Surface Finishing Solutions

树脂滴流

Epoxy Resin Dripping — Crystal-Clear Logo Inserts & Nameplates for Hardware

Create high-gloss 3D logo inserts for zipper pulls, badges and nameplates using epoxy resin. AB ratio, degassing and curing — the complete guide.

滴胶车间工作台 滴胶操作台，AB胶混合，真空脱泡机，固化架排列整齐

The Epoxy Resin Dripping Process

Weigh → Mix → Degas → Fill → Cure → Demold — precision at every step

1AB Ratio Formulation

Epoxy resin (Part A) + hardener (Part B). Common weight ratios: 3:1 or 1:1 depending on formulation. Accuracy matters — ±2% ratio error changes viscosity, cure time and final hardness. Zero-conductivity measuring cup prevents bubbles.

Key Parameters
Common ratio: 3:1 or 1:1 by weight
Tolerance: ±2%
Mix time: 2–3 min slow stir
Pot life: 20–40 min @ 25 °C
Zinc alloy parts before surface finishingBefore
Finished zinc alloy parts after surface finishingAfter

2Degassing (Vacuum or Still Degas)

Mixed resin traps micro-bubbles during stirring. Vacuum chamber at −0.08 to −0.1 MPa for 3–5 min pulls bubbles out. Alternative: let the cup sit still for 10–15 min — bubbles rise naturally, but slower.

Key Parameters
Vacuum level: −0.08 to −0.1 MPa
Vacuum time: 3–5 min
Still degas: 10–15 min
Result: Bubble-free clear resin
真空脱泡机 真空脱泡箱，混合后的AB胶放入，气泡抽出，液面平稳

3Resin Dripping into Molds

Silicone mold with engraved logo cavitiy. Use a dispensing needle or syringe for precise volume control. Fill in one continuous motion to avoid trapped air layers. Allow 5 min still degas after filling for any remaining bubbles to surface.

Key Parameters
Mold material: Silicone rubber
Fill method: Needle / syringe
Fill speed: Slow, one continuous flow
Post-fill degas: 5 min still
滴胶��具 硅胶模具，凹槽为拉链头logo形状
手工滴胶操作 操作工用滴管将树脂注入模具
滴胶后静置 滴胶后的模具在水平台上静置，气泡上升

4Curing — Room Temp vs Accelerated

Room temp (25 °C): 24 hours to demold, 72 hours full cure. Accelerated (60 °C): 2 hours in oven, then cool slowly. Fast heating causes thermal shock = internal cracks. Never exceed 80 °C — resin yellows.

Key Parameters
Room temp cure: 24 h demold / 72 h full
Accelerated cure: 60 °C × 2 h
Max temp: 80 °C (yellowing risk)
Cooling: Slow, in oven
固化架上的产品 滴胶产品整齐放在固化架上���水平校正，温度计显示25°C

5Demolding & Finishing

Peel silicone mold away. Examine for bubbles, incomplete fill or contamination. Crystal-clear result with >90% light transmission. Optional: UV-blocking topcoat to prevent yellowing over time.

Key Parameters
Light transmission: > 90%
Gloss (60°): > 85 GU
Yellowing resistance: Standard / UV-block
Touch-up: Clear coat on surface if needed
水晶滴胶成品 拉链头滴胶logo，字体清晰，表面镜面光亮，3D凸起效果
▼

Epoxy vs Other Clear Coatings

Why epoxy dripping gives the best 3D gloss for logo inserts

PropertyEpoxy ResinUV-Cure ResinAcrylic Clear Coat
3D dome effectExcellentGood (thin only)Poor
Gloss (60°)> 85 GU> 80 GU60–75 GU
Full cure time24–72 h2–10 s24 h
HardnessShore D 75–85Shore D 80–90HB–2H pencil
Yellowing resistanceGood (UV-grade)ExcellentFair
Bubble sensitivityHighLowLow
Max thickness per pour3–5 mm (can layer)0.5–1 mm0.1–0.2 mm

📌 Resin Dripping Cheat Sheet

AB ratio tolerance±2% by weight
Vacuum degas−0.08 to −0.1 MPa, 3–5 min
Room temp cure24 h demold / 72 h full
Accelerated cure60 °C × 2 h
Light transmission> 90%
Gloss (60°)> 85 GU
Max pour thickness3–5 mm
⚠ Never mix AB ratio by volume — always weigh itEpoxy hardener and resin have different densities. A 3:1 ratio by volume can be 4:1 or 2.5:1 by weight, leading to soft, tacky or brittle cured resin. Use a digital scale with 0.1 g resolution. The pot life clock starts the moment you start mixing, not when you finish.

FAQ

Why does my epoxy stay tacky after 24 hours?
Wrong AB ratio — too much hardener or not enough. Check your scale calibration. Temperature below 18 °C slows cure dramatically. Heat the room to 25 °C for 4 hours and see if it finishes curing.
How to remove bubbles that form after pouring?
Bubbles that appear after pouring are usually from air trapped under the mold surface or released from the resin as it warms. Use a heat gun (700–800 °C) passed quickly over the surface — bubbles pop instantly. Or use a pressure pot (0.3–0.5 MPa) during cure to collapse bubbles.
Can I pour epoxy over painted surfaces?
Yes, but the paint must be fully cured and clean. Some paint chemistries inhibit epoxy cure (amine blush). Test on a sample first. A thin sealer coat of the same epoxy or a clear primer prevents compatibility issues.
How to prevent yellowing of clear epoxy?
Use UV-stabilized epoxy (aliphatic or cycloaliphatic hardener). Add UV absorber additive (e.g., Tinuvin) at 0.5–1%. Avoid direct sunlight exposure. For outdoor nameplates, specify a UV-block clear topcoat.
What is the maximum practical logo size for dripping?
Logo area up to 20 × 30 mm for single-pour. Larger than that → exothermic heat builds up and causes cracking. For larger logos, pour in 2–3 mm layers with 4 h between pours, or use a lower-exotherm formulation.

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Workshop Planning Data

Resin Dripping — Data Zinc Alloy Finishing Managers Need

Resin dripping (epoxy dispensing) creates crystal-clear domed logos, badges and nameplates on zinc alloy parts, protecting printed graphics while adding a premium 3D look.

220 m²Workshop Area
12 peopleTeam Size
70 kWInstalled Power
150-400k pcs/dayDaily Output (10 h)

Quality Inspection & Control

Check itemMethodAcceptance standard
Dome height & shapeHeight gauge / visualUniform dome 0.8-2.0 mm, no air bubbles
Bubble controlVisual 10×Zero visible bubbles after degassing
AdhesionCross-cut + tapeISO 2409 rating 0-1
HardnessShore DShore D 75-85 after full cure
TransparencyHaze meterHaze < 3%, water-clear
Cure completenessFingernail / MEK testNo tack after cure schedule

Workshop Layout & Floor Area

ZoneArea
Dispensing machines area80 m²
Degassing & curing room50 m²
Printing / preparation35 m²
QA20 m²
Resin store (cold)15 m²
Utility & lockers20 m²
Total workshop220 m²

Manpower & Shift Plan

RoleHeadcount
Dispenser operators6
Printing / prep operators2
QC inspectors2
Supervisor1
Maintenance1
Total (2 shifts × 10 h)12

Power & Utility Demand

EquipmentDemand
Dispensing machines (4 × 4 kW)16 kW
Curing ovens / UV20 kW
Vacuum degassing8 kW
Air compressor11 kW
Lighting & auxiliary15 kW
Installed total70 kW
Typical running load≈ 52 kW

Production Flow Chart

Print / MaskScreen print logo, mask area
Mix & DegasResin + hardener, vacuum degas
DispenseAuto dispensing of resin dome
Level & CureSelf-level, oven or UV cure
InspectBubble, height, adhesion check
PackProtective film, pack

Daily Capacity — 10-Hour Operating Day

ParameterValue
Cycle time15-30 min (cure 60-120 min)
Pcs per dispenser per 10 h40,000-100,000
Daily output (4 dispensers)150,000-400,000
Monthly output (26 days)3-10 million pcs
First-pass yield≥ 97%

Output Value Estimate

ParameterValue
Processing fee per pieceUSD 0.01-0.03
Daily output value (10 h)USD 2,500-8,000
Monthly output valueUSD 65,000-208,000
Annual output valueUSD 780,000-2,500,000

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