LSR Liquid Silicone U-Shaped Toothbrush
FEATURES
Infrastructure — The Foundation of Customer Confidence
What customers care about: Can you deliver consistently? Will your equipment handle my part geometry?
Ansix Tech`s manufacturing infrastructure is purpose-built for precision LSR molding:
Mold Manufacturing Equipment. We operate a complete suite of precision machining equipment including five-axis high-speed machining centers capable of achieving ±0.002mm accuracy on complex curved surfaces—critical for ensuring that the U-shaped toothbrush`s parting line remains smooth and flash-free. The combination of high-speed machining and EDM (electrical discharge machining) capabilities allows us to process intricate features such as the micro-bristle textures and embedded cleaning nodes that define premium U-shaped toothbrush performance. Precision wire EDM systems handle narrow slots and fine micro-holes as small as 0.03mm, maintaining wall thickness uniformity throughout the U-shaped geometry without distortion.
Our machining workshop includes high-speed CNC centers from leading manufacturers, coordinate measuring machines (CMMs) for dimensional validation, and optical inspection systems for surface quality assessment. Each mold cavity undergoes full-dimension reporting before release, with critical dimensions achieving Cpk ≥ 1.33—a statistical guarantee of process capability.
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Mold Description
Product Materials:
LSR SILICONE
Soft rubber: silicone
Mold Material:
S136ESR
Number of Cavities:
8
Glue Feeding Method:
Hot runner
Cooling Method:
Water cooling
Molding Cycle
12.5s
- The mold manufacturing process and product material selection
Injection Molding Machine Fleet. We deploy 260 injection molding machines with clamping forces ranging from 30 tons to 2,800 tons, covering U-shaped toothbrush components of all sizes from compact travel versions to full-size adult models. Our LSR-dedicated machines include Engel, Arburg (Germany), Fanuc, Sumitomo, Toshiba, and Nissei (Japan), providing unmatched flexibility for single-shot LSR, two-shot overmolding, and multi-material applications. All primary LSR machines feature all-electric servo-drive systems, delivering repeatable injection accuracy of ±0.1% shot-to-shot to ensure that every production cycle yields identical part quality. For medical and food-grade U-shaped toothbrush production, we maintain Class 8 cleanroom facilities compliant with ISO 14644 and US FDA 510K standards.
Quality Metrology Systems. Our quality infrastructure includes CMMs for geometric dimensioning and tolerancing (GD&T) verification, optical measurement systems for fast in-process inspection, and hardness testers for material validation. Every mold receives a full-dimension inspection report before shipment, and during production, we implement statistical process control (SPC) with real-time Cp and Cpk tracking to monitor dimensional stability continuously.
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Value Delivered. This equipment foundation directly addresses customer concerns: consistent part quality from first shot to millionth shot, reliable delivery through redundant machine capacity, and regulatory readiness for FDA and ISO-certified production environments.
Part Two: Mold Engineering — Core Competitiveness in Precision Tooling
What customers care about: How many cycles will this mold run? What tolerances can you hold? How fast can you deliver?
Tool Steel Selection and Performance Guarantees
LSR molding imposes unique demands on tooling due to the material`s high-temperature curing (170-210°C) and potential chemical interactions from platinum-catalyst reaction byproducts. Ansix Tech selects mold steels based on part requirements and production volume:
Steel Grade Hardness (HRC) Characteristics Application
S136 48-52 Superior corrosion resistance, excellent mirror polish (Ra≤0.1μm) Transparent U-shaped brush heads, high-gloss surfaces, medical/food-grade components
NAK80 38-41 Pre-hardened, exceptional machinability, mirror polish Ra≤0.05μm Complex U-shaped geometries requiring fine detail, intricate cooling channels
H13 48-52 Hot-work steel, high thermal conductivity, good toughness High-cavitation production molds requiring rapid thermal cycling
1.2083 (DIN) 48-52 Good corrosion resistance, cost-effective Medium-volume production, non-transparent components
17-4PH 40-45 Precipitation-hardening stainless steel, high strength Long-run production requiring dimensional stability under load
For maximum mold longevity in high-volume LSR production, we apply specialized coatings: DLC (diamond-like carbon) coating achieves HV 2000-3000 hardness with friction coefficients as low as 0.05-0.1, while nitriding treatments provide HV 1000+ surface hardness at moderate cost.
Mold Life Guarantee. We provide specific cycle guarantees based on steel selection: 500,000 cycles minimum for glass-filled materials, 1,000,000 cycles for unfilled medical-grade silicone. Each mold ships with material certification reports and documented heat treatment curves for full traceability.
Dimensional Capability Statement
Part Category Achievable Tolerance Customer Value
General structural features ±0.05mm Reliable assembly fit without post-processing
Critical fit surfaces / alignment features ±0.02mm Consistent performance across production batches
Precision micro-features (bristle texture nodes) ±0.008mm Uniform cleaning pressure, no sharp edges
Overmolded interface dimensions ±0.015mm Perfect integration with electric toothbrush handles
Mold Type and Gate System Optimization
Cold Runner Systems with Valve Gate Control. LSR requires specialized runner systems because the material cures at elevated temperatures. We implement cold runner systems that maintain LSR at low temperature (around 35°C) until injection, then fully crosslink the material within the heated cavity (140-220°C). This approach eliminates material waste—a critical advantage for customers concerned about raw material costs.
Our precision valve-gate cold runner systems are designed to support fully automated startup and balanced cavity filling, even in family molds with cavities of varying volumes. During process setup, the system automatically detects the material volume required to fill each cavity, greatly reducing setup time and material consumption.
Advanced Venting Strategy. LSRs low viscosity—comparable to water—makes it highly susceptible to flash and air entrapment[reference:16]. We implement micro-EDM venting channels with labyrinth-effect surface roughness (Ra 3-22μm), which allows trapped air to escape while containing the silicone within cavity boundaries. For the U-shaped toothbrush s complex arched geometry, our engineering team positions vents specifically at the last points of mold fill—where air trapping is most likely to occur.
Mold Flow Analysis (MFA). Before steel is cut, we perform comprehensive Moldflow simulation to analyze filling patterns, weld line locations, and air trap positions. This virtual molding approach identifies and resolves potential issues before physical tooling begins, preventing costly revisions downstream. For LSR, mold flow analysis is particularly critical given the material`s shear-thinning behavior and complex thermal curing profile. We use these simulations to optimize gate location and quantity, ensuring balanced cavity filling across all mold cavities simultaneously.
Cooling System Design for Production Efficiency
Uniform thermal management is essential for consistent LSR curing. We design conformal cooling channels that follow the U-shaped contour of the toothbrush, maintaining cavity temperature uniformity within ±1°C—preventing both incomplete cure (which causes sticky parts) and overcure (which degrades flexibility). Each cooling circuit is validated through thermal simulation before manufacturing to ensure balanced heat dissipation across all cavities.
Lead Time Standards
Mold Complexity Standard Lead Time Express Option Quality Assurance
Simple U-shaped brush mold (single cavity) 10 days 7 days Full inspection report
Medium complexity (multi-cavity) 25-45 days 20 days T0 sample included
High-complexity (family mold with inserts) 35-50 days 28 days DFM + Moldflow + T0-T3 reports
Even under accelerated timelines, we never compromise validation: every mold receives run-in testing and dimension verification before shipment.
Customer Value Summary for Mold Engineering:
Extended tool life = Lower per-part amortization costs
Precision tolerances = Eliminates rework and assembly failures
Cold runner system = Reduced material waste (up to 30% savings on LSR consumption)
Mold flow validation upfront = Avoids
5
,
000
−
5,000−20,000 in post-tooling design changes
Part Three: LSR Injection Molding — Process Control Excellence
What customers care about: Will my parts warp? Will there be flash? Will different batches match?
The Unique Challenges of LSR Molding
LSR differs fundamentally from thermoplastic injection molding: it undergoes chemical crosslinking at elevated temperatures (typically 170-210°C) rather than physical cooling, and it exhibits extremely low viscosity during injection. This combination creates three specific manufacturing challenges:
Flash formation — Excess material escapes beyond cavity boundaries along parting lines
Air entrapment — Low-viscosity LSR can` t push trapped air out of deep cavities
Gate pre-curing — Premature curing at the injection point blocks proper cavity filling
Ansix Tech addresses each challenge through systematic process control systems.
Process Standardization and MES Integration
All injection molding machines in our LSR production cells are networked to a Manufacturing Execution System (MES) that locks critical process parameters: temperature profiles (barrel, nozzle, mold), injection pressure and speed profiles, cure time, shot volume, and cooling duration. Parameter adjustments require engineer-level authorization with full audit trail documentation. Every production batch undergoes first-article and last-article dimensional comparison to verify process stability throughout the run.
Size Stability Control
U-shaped toothbrush dimensional consistency depends on precise thermal management. We implement zone-divided mold temperature control using dedicated mold temperature controllers, maintaining core and cavity temperature differentials within 2°C—a critical factor for preventing distortion of the arched geometry. In production validation, we have demonstrated that for similar LSR oral care products, three consecutive production batches separated by one week exhibited critical hole spacing fluctuations of ≤0.02mm.
For high-volume production, we incorporate in-mold pressure and temperature sensors that provide real-time feedback to the injection molding machine`s closed-loop control system. This allows automatic compensation for material viscosity variations between batches, ensuring part-to-part consistency even when incoming material properties fluctuate.
Surface Finish Specification
Surface Requirement Achievable Standard Customer Application
General appearance No bubbles, no flow marks Standard U-shaped toothbrush
High-gloss transparent Ra ≤ 0.05μm, optical clarity Premium transparent U-shaped brush heads
Matte/textured finish Consistent grain depth ±0.005mm Non-slip grip surfaces
Post-coating/printing Compensated for deformation, print registration ±0.1mm Branded/customized brushes
Material Selection and Traceability
We source medical-grade and food-grade LSR materials from certified suppliers, maintaining full material traceability from batch receipt through finished product shipment. Our material portfolio includes biocompatible LSR grades suitable for oral contact applications, meeting USP Class VI and ISO 10993 certification requirements. Each material batch is tested for key properties—viscosity, cure rate, shore hardness, and tensile strength—before release to production.
We have extensive experience molding engineering thermoplastics alongside LSR, including PC/ABS blends, polycarbonate, PPS with 40% glass fiber reinforcement, PEEK for high-performance components, PTFE/PFA for chemical resistance, nylon 6 with 30% glass, PBT, and high-temperature materials such as PEI, PPS, and LCP.
Flame retardancy and UV resistance validation: We verify UL94 V-0 ratings for applicable components and conduct UV exposure testing to ensure color stability and mechanical property retention after extended service life.
Process Optimization Case Study
In a recent LSR overmolding project, Engel`s automated LSR cell—similar to the technology we deploy—demonstrated a 62% reduction in process variation through real-time viscosity monitoring and automatic injection volume adjustment, resulting in more stable process control, reproducible component quality, and reduced scrap. Ansix Tech applies analogous control technologies across our LSR molding lines.
Customer Value Summary for Process Control:
No flash = Eliminates manual deflashing labor (typically
0.02
−
0.02−0.05 per part)
Consistent dimensions batch-to-batch = Zero assembly line rejects
Surface grade assurance = No secondary finishing costs
Full traceability = Regulatory compliance for FDA/ISO markets
Part Four: Quality Assurance — Building Customer Trust Through Validation
What customers care about: How do I know these parts are good? What if something goes wrong?
Four-Stage Quality Validation Protocol
Stage 1: Design for Manufacturing (DFM) and Mold Flow Analysis (MFA). Before any steel is cut, our engineering team prepares a comprehensive DFM report covering: recommended draft angles (typically 1-3° for LSR), wall thickness optimization (2-4mm recommended for U-shaped geometry), gate location and type, ejector pin mark locations and allowable tolerances, and mold split line placement.
The DFM report serves as a collaborative design tool—identifying potential manufacturing conflicts, suggesting cost-saving alternatives, and ensuring the final product design is optimized for high-volume production before tooling investment begins. Changes made at this stage cost pennies compared to the dollars required for post-tooling modifications.
Stage 2: Tooling Qualification (T0 through T3). We provide iterative sampling reports throughout mold development:
T0 — First test shot: validate basic mold function, identify major defects
T1 — First corrective iteration: verify dimensional accuracy against CAD
T2 — Fine-tuning: optimize gate balance, venting, cooling uniformity
T3 — Production-ready validation: demonstrate capability at target cycle time
Each trial includes a detailed improvement report with dimensional measurements, photos of any defects, and corrective action documentation. For complex U-shaped molds, we can exchange replaceable inserts to test different gate configurations or venting designs without rebuilding the entire mold—saving weeks of lead time and thousands in retooling costs.
Stage 3: Pre-production Validation (PPAP equivalent). Before full production release, we run a small validation batch of 100-500 cycles, during which we measure:
Statistical process capability (Cpk ≥ 1.33 for critical dimensions)
Cycle time consistency (standard deviation ≤ 0.5 seconds)
Visual defect rate (target ≤ 0.5%)
First-pass yield
Only when all acceptance criteria are met do we release the mold for full-scale production.
Stage 4: In-process and Final Inspection. During production runs, operators conduct hourly dimensional checks using go/no-go gauges and optical comparators. Statistical control charts track key dimensions in real-time, with automatic alerts when parameters drift beyond control limits. Completed products undergo final inspection: material hardness verification, surface defect inspection (automated vision systems for high-volume lines), assembly fit testing, and packaging integrity verification for drop-ship orders.
Ongoing Support and Maintenance
Spare parts management: Each mold ships with a documented set of replaceable wear components (ejector pins, core inserts) with part numbers and sourcing information to support in-house maintenance.
Scheduled maintenance program: We offer mold maintenance services at 200,000-cycle intervals, including cleaning, lubrication, wear measurement, and replacement of wear components.
Lifetime repair policy: Mold repairs are billed at cost for the life of the tool. For molds that have completed their guaranteed cycle life, we maintain tooling drawings and spare part specifications to support continued production.
Customer Complaint Response Matrix
Common Complaint Our Guarantee Evidence Provided
"Mold requires frequent repairs" 1,000-cycle run-in test before shipment; 3-year structural guarantee (excluding normal wear) Wear measurement report, run-in cycle log
"Excessive flash increases deflashing costs" Parting line fit ≤0.005mm; self-locking clamp force compensation limits flash ≤0.03mm per batch Flash measurement data from validation run
"Dimensions change between production runs" MES-locked parameters + ultrasonic wall thickness monitoring; in-mold pressure sensors for closed-loop control Cp/Cpk trend charts, material batch traceability records
"Mold repair takes too long" In-house electrode machining and EDM; standard repairs within 24 hours Documented repair SLA
Validation Documentation Package
For each customer project, we deliver a complete validation documentation package including:
DFM report with moldability analysis and optimization recommendations
Mold flow simulation report with fill, pack, cool, and warp analysis
Full-dimension inspection report (CMM) for each cavity
Material certification (steel and LSR)
Process parameter sheet (temperature, pressure, speed, time)
Cp/Cpk capability study for critical dimensions
Sample parts from T0 through T3 with measurement data
Run-in test log (cycle count, observations, any adjustments)
Part Five: Cost Optimization and Delivery Efficiency
What customers care about: How do I minimize unit cost? Can you scale with my demand?
Three-Pronged Cost Reduction Strategy
Ansix Tech reduces total production costs through systematic optimization across material consumption, process efficiency, and engineering design.
Material cost reduction. Our cold runner systems eliminate LSR waste from runner and sprue—a significant savings given that LSR costs are typically 3-5 times higher than commodity thermoplastics. For U-shaped toothbrush molds with multiple cavities, the cold runner approach reduces material consumption by 25-40% compared to hot runner alternatives.
We maintain strategic sourcing relationships with certified LSR suppliers, providing customers access to competitive material pricing combined with our purchasing volume across 260 injection molding machines. Material recommendations include specific grade specifications (brand and formulation) matched to application requirements—eliminating trial-and-error material selection.
Cycle time optimization. Each second saved in cycle time directly reduces unit cost. Our mold designs incorporate optimized cooling channel layouts that accelerate thermal extraction without compromising cure quality. Cooling represents 60-80% of total cycle time in LSR molding; conformal cooling following the U-shaped contour typically reduces cooling time by 20-35% compared to conventional straight-drilled cooling.
Injection speed and pressure profiles are optimized using mold flow analysis to find the fastest fill time consistent with defect-free molding. Multi-stage injection speed profiles prevent both underfill (slow speed) and flash (excessive speed) while minimizing cycle duration.
Design-driven cost reduction (DFM). Early engineering involvement identifies cost-saving opportunities before tooling is built: simplifying undercuts to eliminate side-action mechanisms (reducing mold complexity by 15-30%), adjusting wall thickness to accelerate cooling (reducing cycle time), and consolidating multiple components into single overmolded parts (eliminating assembly operations and reducing supply chain complexity).
Cost Reduction Examples
For typical U-shaped toothbrush projects, Ansix Tech achieves:
Material savings: 20-35% — Through cold runner systems and optimized gate design
Cycle time reduction: 15-25% — Via conformal cooling and process optimization
Defect rate reduction: 50-70% — From DFM validation and MES-controlled processes
Tooling rework avoidance: $5,000-20,000 per project — Prevented by up-front DFM
Production Capacity and Scalability
Our 260 injection molding machines across four production bases provide redundant capacity and geographic flexibility. For U-shaped toothbrush production, we can support:
Volume Tier Production Approach Lead Time
Prototype / testing (50-500 units) Single-cavity mold, manual cell 1-2 weeks
Low volume (500-10,000 units/month) Single mold, automated cell 2-3 weeks
Medium volume (10,000-100,000 units/month) Multi-cavity mold, dedicated machine 3-4 weeks
High volume (100,000+ units/month) Multiple molds, multiple machines 2-3 weeks
Rapid changeover protocols (SMED methodology) keep machine downtime below 15 minutes between production runs of different products, maintaining >90% overall equipment effectiveness (OEE).
Delivery Assurance
All four Ansix Tech production facilities operate under ISO 9001:2015 (quality management), IATF 16949:2016 (automotive, applicable to high-reliability manufacturing), ISO 13485:2016 (medical devices), and ISO 14001:2015 (environmental management). This multi-certification framework ensures consistent quality delivery regardless of which production site fulfills an order.
Our in-house supply chain management team maintains long-term relationships with raw material suppliers and logistics partners, ensuring raw material availability and on-time finished goods delivery. We work with customers to establish safety stock levels and reorder triggers that balance inventory cost against supply risk.
Conclusion: Translating Technical Expertise into Customer Value
At Ansix Tech, we understand that a mold is not a piece of steel—it is a revenue-generating asset for your business. Every design decision we make—from material selection to cooling layout to gate location—is guided by one question: What delivers the greatest value to our customer?
Hardware investment provides the precision foundation—machines capable of ±0.002mm accuracy and Cpk≥1.33 process capability—reducing your quality risk before production begins.
Mold engineering excellence provides the longevity guarantee—1,000,000-cycle tool life with full documentation—reducing your per-part amortization cost and eliminating unplanned downtime.
Process control systems provide the consistency assurance—MES-locked parameters, real-time monitoring, automatic viscosity compensation—eliminating batch-to-batch variation and manual intervention.
Quality validation protocols provide the regulatory confidence—ISO 13485-certified systems, full traceability, comprehensive documentation—supporting FDA and international market compliance.
Cost optimization provides the competitive advantage—20-35% material savings through cold runners, 15-25% cycle time reduction through conformal cooling—lowering your unit cost without compromising quality.
When you partner with Ansix Tech for LSR U-shaped toothbrush production, you gain a manufacturing partner with 28 years of experience, 260 injection molding machines, 1,200+ employees, four strategic production bases, and a relentless focus on translating technical precision into measurable commercial advantage.
We invite you to schedule a DFM review for your U-shaped toothbrush project. Together, we will walk through the mold flow analysis, identify potential manufacturing risks before they become problems, and establish a production plan that delivers consistent quality at the lowest possible cost.
Ansix Tech — Engineering Trust, Delivering Value
*Contact: info@ansixtech.com | Phone: +86 15818692114*
Ansix Tech Co Ltd
If you have any plans related to LSR Liquid Silicone U-Shaped Toothbrush , you can contact us at any time. We will turn your ideas into reality, let you realize your dreams, and obtain large orders from the market. Our contact information is info@ansixtech.com. Or contact our CTO, mail: stephen@ansixtech.com
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