The metal strap Clean Factory is a batch/professional level metal strap cleaning, polishing, oxidation removal, passivation, and coating processing service provider for watch factories, brands, and repair centers. The core is a standardized production line of ultrasonic+multi groove line+drying+surface treatment, suitable for stainless steel, titanium, copper, copper alloy, and PVD coated watch straps.
1、 Core service content (factory level)
Deep cleaning: degreasing, removing sweat and salt deposits, removing welding spots, removing oxide skin, deburring, and removing polishing wax.
Surface treatment: polishing (mirror/brushed), passivation, rust prevention, PVD coating (IP black/titanium/rose gold, etc.).
Supporting processing: strap disassembly/assembly, chain link lubrication, testing, dust-free packaging.
Batch OEM: Cleaning/polishing of new watch straps by watch factories, after-sales refurbishment, and batch processing by repair centers.
2、 Mainstream equipment and production lines
Ultrasonic cleaning machine (single slot/multi slot line): mainly 40kHz, equipped with dedicated oil/wax/rust removal solution.
Vibration/centrifugal/eddy current grinding machine: batch deburring and rough polishing.
High temperature steam cleaning machine: sterilizes and cleans gaps.
Hot air/vacuum drying oven: thoroughly dry and rust proof.
Polishing machine/grinding line: rough polishing → medium polishing → fine polishing → mirror polishing.
PVD vacuum coating machine: coating reinforcement/color modification.
Testing equipment: Cleanliness tester, salt spray test, film thickness gauge, nickel release/ROHS testing.
3、 Standard cleaning process (batch production line)
Pre inspection and disassembly: classification, removal of meter heads, removal of meter sections, removal of screws/shaft cores.
Coarse washing to remove oil: ultrasonic wave+degreaser, 30-45 ℃, 5-10 minutes.
Fine cleaning/oxidation removal: Ultrasonic waves+specialized cleaning agents/weak acid passivation solution to remove welding spots/oxidation layers.
Multi tank rinsing: pure water+bubbling+spraying, gradually reducing residue.
Drying: Hot air/vacuum drying, 100-120 ℃, thoroughly dehydrated.
Polishing/Passivation/Coating (optional): Surface treatment as required.
Lubrication and assembly: Special gauge oil for chain links, reassembly inspection.
Testing and packaging: cleanliness/appearance/functional testing, dust-free/vacuum packaging.
4、 Major domestic factories (mainly in the Pearl River Delta)
Dongguan Zhongxin Strap Jewelry Hardware Polishing Factory: Strap/Case Polishing, Polishing, Deburring, Stainless Steel/Copper/Titanium Alloy.
Dongguan Xindengsheng Intelligent Grinding: Vibration/Ultrasonic Cleaning, Grinding Liquid/Brightener, Oxidation/Wax Removal.
Dongguan Biliang Cleaning Technology: Ultrasonic cleaning, flat grinding, serving Huawei/Apple/BYD.
Xinzhongji Vacuum Technology (Dongguan): PVD coating+fully automatic cleaning line, dedicated to clock hardware.
Shanghai Qianyang Electronics: Precision cleaning, meeting ISO16232 cleanliness standards, suitable for high-end watch straps.
5、 Key points of cooperation and delivery
Minimum order quantity: Batch OEM usually ≥ 500-1000 pieces; Small batches/samples can be negotiated.
Cycle: Routine cleaning takes 1-3 days; Polishing/coating for 3-7 days.
Material compatibility: Stainless steel 316L/304, titanium, copper, brass, PVD coating are all available; Gold plating/ultra-thin coating needs to be specified in advance.
Environmental requirements: ROHS, REACH, nickel release standard, suitable for export.
Quotation: Pricing based on material, process, and quantity. Cleaning costs approximately 0.5-3 yuan per piece, and polishing/coating costs separately.
