Silicone rubber gasket for laptop overmolded LCD screen
FEATURES
Injection Molding Machine Fleet
Ansix operates a total fleet of 260 injection molding machines, with clamping force capacities ranging from 30 tons to 2,800 tons, covering the entire spectrum of component size requirements from miniature electronics to larger structural parts.
The machinery lineup includes premier brands such as Japan‘s Fanuc, Sumitomo, Toshiba, Nissei, Engel, and China’s Haitian and Victor Taichung Machinery. For liquid silicone rubber (LSR) overmolding applications, the company features Germany‘s Arburg machines, specifically configured for LSR processing with two-component material feeding systems.
All machines are equipped with full servo-electric drive systems, delivering stable shot-to-shot repeatability with accuracy of ±0.1%. This ensures that every molded part remains dimensionally consistent across million-cycle production runs — directly translating into reduced scrap rates and lower overall manufacturing costs for customers.
Inspection and Metrology Equipment
Ansix operates an ISO 8 Class Cleanroom and follows GMP standards compliant with US medical-grade FDA 510K requirements, implementing rigorous quality control protocols across all production stages.
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Mold Description
Product Materials:
PORON VMQ SILICONE+carbon black
Soft rubber: TPE
Mold Material:
S136ESR
Number of Cavities:
2+2
Glue Feeding Method:
Hot runner
Cooling Method:
Water cooling
Molding Cycle
42.5s
- The mold manufacturing process and product material selection
The company maintains Coordinate Measuring Machines (CMM) and optical imaging measurement systems, performing full-dimension report comparisons for every mold before it leaves the facility. Critical dimensions are verified to achieve Cpk ≥ 1.33, providing statistical assurance of process capability and dimensional stability.
Equipment Category Capability Customer Value
5-axis CNC machining 0.002mm precision No mold mismatch, smooth parting line
Slow-wire EDM 0.03mm micro features Thin-wall integrity, no distortion
CMM + Optical inspection Full-dimension reporting, CPK≥1.33 Guaranteed dimensional conformance
Cleanroom (ISO 8) Compliant with FDA 510K Medical-grade cleanliness for sensitive electronics
Customer Value Translation: “We equip our five-axis machining centers and slow-wire EDM systems to process your complex LCD bezel geometries at 0.002mm precision, ensuring your silicone gasket seats flush with no flash. Each mold receives a full-dimension CMM report with CPK≥1.33 before delivery.”
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Ansix holds a complete portfolio of international quality certifications: ISO9001, IATF16949 (automotive), ISO13485 (medical devices), ISO14001 (environmental), and BSCI (social compliance). These accreditations reflect the company‘s commitment to systematic quality control and regulatory compliance across multiple industries.
2. Core Competencies: Mold Manufacturing That Speaks with Numbers
2.1 Mold Life Expectancy
Customer trust in mold quality begins with confidence in production longevity. Ansix selects mold materials according to specific application requirements:
Mold Component Material Options Guaranteed Life (GF-reinforced) Customer Value
Mold base P20 - Structural stability
Mold core/cavity S136, 2344, 2343, 8407, SKD11/61/DC53, M340/4Cr13/9Cr18, NAK80, H13 500,000 shots Predictable tooling ROI over million-cycle runs
Wear inserts Powder metallurgy tool steel Extended maintenance intervals Reduced downtime
Each mold is accompanied by material certifications and heat treatment curves, providing full traceability.
Customer Value Translation: “Your mold will deliver 500,000 shots in GF-reinforced material with full material certification. We deliver this guarantee backed by heat treatment documentation and wear testing.”
2.2 Achievable Tolerances
Feature Type Standard Tolerance Precision Capability
Structural components ±0.05mm Standard
Precision sealing surfaces ±0.02mm LSR industry benchmark
Critical mating features ±0.005mm High-precision category
Customer Value Translation: “We hold ±0.02mm on your LCD sealing lip — meaning consistent compression, no leak paths, and no secondary adjustment at assembly.”
2.3 Mold Types and Configurations
Ansix offers a comprehensive range of mold architectures:
Cold-runner molds — Standard configuration for LSR materials, utilizing cold runner systems to minimize material waste
Valve-gated hot runner molds — Enables elimination of runner waste in high-volume production, significantly reducing piece-part cost
Stack molds — Doubles production output per machine cycle for high-volume programs
Two-shot / multi-material molds — For complex integrated sealing solutions combining rigid plastic substrates with LSR overmolding
High-gloss / mirror-finish molds — Surface roughness Ra < 0.05μm, suitable for transparent or cosmetic-grade components
2.4 Gate and Runner System Design
Before any steel is cut, Ansix performs mold flow analysis to predict melt flow behavior, weld line positions, and air trap locations. This simulation-driven approach enables optimization of gate placement and runner geometry before production begins, ensuring balanced cavity filling without premature curing or incomplete fill.
Customer Value Translation: “Mold flow analysis eliminates weld lines and short shots before you spend a dollar on steel — meaning faster time-to-sampling and no unpleasant surprises.”
2.5 Lead Time Standards
Mold Complexity Standard Lead Time Expedited (with validation preserved)
Simple molds 10 days -
Medium-complexity molds 25–45 days 20 days minimum
High-complexity precision molds Customized schedule By negotiation
Crucially, expedited delivery does not compromise mold validation — all verification steps (dimensional inspection, sampling, adjustment rounds) are preserved.
Customer Value Translation: “Your production schedule drives our lead time commitment. Expedited options maintain all quality gates, so speed does not mean shortcuts.”
2.6 Flash Control and Parting Line Quality
Ansix achieves parting line matching accuracy of 0.005mm through precision grinding and EDM finishing. Combined with self-locking clamping force compensation, flash height is consistently maintained below 0.03mm, eliminating manual deflashing operations across the entire production batch.
Customer Value Translation: “No secondary deflashing means lower labor costs and no risk of operator damage to delicate sealing lips.”
3. Injection Molding Excellence: Taking the Risk Out of Production
3.1 Silicone Rubber Gasket Product Introduction
Liquid Silicone Rubber (LSR) has emerged as the premium material choice for electronic display sealing applications worldwide. For laptop LCD screens, an overmolded silicone rubber gasket serves multiple critical functions simultaneously: dust and moisture ingress protection, shock absorption, vibration damping, and display edge sealing.
The global LSR market is valued at approximately USD 2.81 billion (2024) , projected to grow at a CAGR of 8.50% through 2035, driven by demand for reliable sealing solutions in portable electronics.
Key LSR material properties relevant to laptop LCD applications:
Property Typical Value Functional Benefit
Operating temperature –65°C to +150°C (peak 260°C) Withstands device operational and environmental extremes
Compression set Very low Maintains sealing force over product lifespan
Hardness range 5–80 Shore A Soft-touch sealing up to firm structural sealing
Biocompatibility USP Class VI, ISO 10993 Safe for skin-contact devices
Tear resistance High Withstands repeated assembly/disassembly cycles
3.2 LSR Overmolding Process Overview
The LSR overmolding process encapsulates a rigid substrate (typically PC/ABS plastic or metal LCD frame) with a precision silicone rubber sealing layer. The two-component LSR material (Parts A and B) is metered, mixed at a 1:1 ratio, and injected into a cold-runner mold where the substrate is pre-loaded.
Injection pressures for LSR typically range from 250 to 10,000 psi, with mold temperatures controlled between 150°C–160°C to initiate heat-activated curing. Cure times range from 20 to 60 seconds depending on part geometry and material formulation.
Process flow diagram:
text
Substrate preparation → LSR metering/mixing → Injection (closed mold)
→ Heat curing → Mold opening → Finished part ejection → Secondary operations (optional)
3.3 Material Selection and Raw Material Characteristics
Specific LSR grades suitable for laptop LCD gaskets:
Material Grade / Supplier Key Properties Application Suitability
Momentive Silopren LSR 3286/40 Self-lubricating properties Gaskets requiring easy assembly into tight bezels
Dow SILASTIC™ RBL-9200-65 LSR Improved flowability, extended pot life Complex thin-wall geometries with intricate flow paths
Dow SILASTIC™ RBL-9694-45M 45 Shore A, 1:1 mix ratio, cure-in-place High-volume gasketing with consistent sealing force
IOTA LSR 6330 30 durometer, excellent low-hardness sealing Soft-compression seals for delicate display assemblies
Fluoro-LSR (F-LSR) Fuel and oil resistance, Tg –68°C Specialized applications requiring chemical resistance
Material certifications: All silicone materials are manufactured from virgin polymer, free from visible internal porosity, surface defects, and dimensional irregularities as specified by ASTM standards.
Material selection guidance provided to customers:
Shore A hardness: Softer silicone (e.g., 30 Shore A) provides better sealing at lower compression force, ideal for fragile LCD assemblies; harder grades (e.g., 60–70 Shore A) offer greater durability
Platinum-cured vs. peroxide-cured: Platinum-cured LSR offers lower compression set and better biocompatibility, preferred for medical-grade and premium electronics applications
Color options: LSR is transparent across grades but can be pigmented to custom colors without degrading mechanical properties
Thermal conductivity: For heat-dissipation applications, thermally conductive silicone grades can be specified
Customer Value Translation: “We select your LSR material based on your sealing requirements, assembly torque limits, and product lifespan targets. Softer material means lower closure force, which means less stress on your LCD module.”
3.4 Process Standardization and Control
All injection molding machines are networked and integrated with a Manufacturing Execution System (MES) . Critical process parameters — including injection pressure, temperature profiles, curing time, and clamping force — are locked within the MES system, accessible only by authorized engineers. Each production batch undergoes first-article and last-article inspection comparison.
Customer Value Translation: “Every shot is made under identical conditions. Your part from batch #1000 is identical to batch #1 — predictable supply, predictable quality.”
3.5 Dimensional Stability Control
For precision electronic sealing applications, dimensional stability is paramount. Ansix employs zone-controlled mold temperature regulation systems, maintaining core-cavity temperature differentials within 2°C to minimize warpage.
Performance data: Across comparable gasket products produced over three consecutive weeks, critical hole-to-hole spacing variations are maintained below ±0.02mm.
Customer Value Translation: “±0.02mm hole spacing stability means your LCD panel seats correctly every time, with no assembly interference or fit issues.”
3.6 Appearance Quality Standards
Ansix defines and achieves specific appearance grades depending on application requirements:
Appearance Feature Achievable Standard
Transparent parts No bubbles, no flow marks
Plated / coated parts No gas marks or surface imperfections
High-gloss surfaces Ra ≤ 0.2μm surface roughness
Printed / painted surfaces Registration accuracy ±0.1mm with pre-calculated distortion compensation
3.7 Special Material Processing Capability
Ansix maintains extensive production experience with a wide range of engineering materials beyond standard LSR:
Material Type Examples Processing Considerations
PC/ABS blends PC/ABS, PC High-impact, flame-retardant electronics housings
High-temperature engineering plastics PPS+40%GF, PEEK, PEI, PPS, LCP Thermal management required, high wear resistance
Glass-filled thermoplastics PA6+GF30, PBT Abrasive to mold steel, requires hardened tooling
PTFE / PFA fluoropolymers PTFE, PFA, FEP Chemical resistance, high-temperature stability
Thermoplastic elastomers TPE, TPU Soft-touch overmolding applications
Fire rating compliance: Materials can achieve UL94 V-0 (flame-retardant) for electronic enclosure applications. Weathering resistance certified up to 3,000 hours UV exposure with no color change.
Customer Value Translation: “From standard PC/ABS to advanced PEEK, we have production-proven processes. If your material selection changes, we adapt without requalifying your entire supply chain.”
4. End-to-End Service: Reducing Customer Management Costs
4.1 Early Design Engagement: Design for Manufacturability (DFM) Report
Before any investment in steel cutting, Ansix provides a comprehensive DFM report for customer approval. This report includes:
Draft angle recommendations to facilitate smooth part ejection without surface drag marks
Wall thickness optimization to balance structural integrity and cycle time
Gate placement analysis to ensure balanced cavity fill with no short shots
Ejector pin mark location approval — customers approve where cosmetic surfaces will and will not have ejector witness marks
Material shrinkage compensation calculations
This early-stage analysis is fundamental to LSR overmolding success. By integrating DFM principles at the design stage, Ansix reduces design iterations, minimizes tooling costs, and streamlines the entire production process.
Customer Value Translation: “We find your manufacturability problems before you commit to tooling. DFM means fewer design rounds, lower engineering costs, and faster path to production.”
Proactive risk management: Ansix applies DFMEA (Design Failure Mode Effects Analysis) and PFMEA (Process Failure Mode Effects Analysis) methodologies to systematically identify and mitigate potential failure points before production.
4.2 Sampling and Validation (T0 through T3)
Ansix provides structured sampling and validation rounds:
Sampling Round Deliverable
T0 (first shot) First molded samples, baseline dimensional measurement
T1 First modifications implemented, partial improvement verification
T2 Refinements completed, performance near target
T3 Final validated samples with full dimensional report
Each round is accompanied by an improvement report documenting changes made and remaining issues. For design variations requiring evaluation, Ansix can produce quick-change mold inserts to validate alternative geometries without requiring complete mold re-manufacture.
4.3 Pilot Production (Pre-mass Production Validation)
Prior to full-scale mass production ramp-up, Ansix executes pilot production runs of 100 to 500 shots. During this pilot phase:
Production yield rates are statistically calculated
Process capability (Cpk) is verified for critical dimensions
Equipment stability is validated
Post-molding operations (deflashing, inspection, packaging) are rehearsed
Mass production does not commence until statistical evidence confirms stable, capable performance.
4.4 Maintenance and Spare Parts
Ansix delivers each mold with a complete set of spare wear parts (ejector pins, core inserts) included. The company provides preventive mold maintenance services every 200,000 shots, with lifetime repair services available at cost-based pricing.
4.5 Quality Assurance Protocol
Quality Stage Activities
Incoming material Raw material certification verification, lot tracking
In-process Real-time process parameter monitoring via MES, automated flash detection
Outgoing inspection Full-dimension sampling per AQL standards
Statistical process control Critical dimensions tracked with CPK ≥ 1.33
Cleanliness ISO 8 Cleanroom for contamination-sensitive medical/electronic grades
Traceability Full material batch traceability to finished component
5. Differentiators: Direct Commitments That Address Common Pain Points
5.1 Addressing Mold Reliability Concerns
Customer Complaint Ansix Commitment
“Molds require frequent maintenance, disrupting production schedules.” “We perform 2,000-shot aging test before mold delivery, complete with wear report. We provide three-year structural warranty on mold (excluding consumable wear parts).”
“Excessive flash requires expensive manual deflashing.” “We machine parting lines to 0.005mm fit accuracy with self-locking clamp force compensation, maintaining flash below 0.03mm — eliminating manual deflashing.”
“Dimensional variation between production batches.” “Molding machines equipped with ultrasonic wall thickness sensors providing real-time feedback and automatic packing pressure compensation. In-mold temperature and pressure sensors enable closed-loop process control.”
“Mold repair lead times are too long.” “In-house electrode machining and EDM workshop. Mold repairs stay within our facility. Standard repair (weld repair/insert replacement) restored within 24 hours.”
5.2 Cost Reduction Mechanisms
Ansix reduces customer costs across multiple dimensions:
Cost Dimension Specific Measures Impact
Material cost Optimal gate design minimizes runner waste, cold-runner systems eliminate sprue Up to 30% material savings in high-volume LSR projects
Process efficiency Shorter cycle times through optimized mold cooling and high-speed injection Increased output per machine-hour
Secondary operations Flash control eliminates deflashing; integrated overmolding eliminates adhesive assembly Reduced labor and handling costs
Tooling amortization Multi-cavity molds and stack molds double output per cycle Lower piece-part price
Supply chain consolidation Single-source mold + molding + assembly Reduced vendor management overhead
Design optimization DFM eliminates post-tooling design changes and rework No unplanned engineering costs
Customer Value Translation: “Our valve-gated cold runner system eliminates material waste. Our flash control eliminates manual deflashing labor. Our MES eliminates batch-to-batch variability — every elimination reduces your hard cost per part.”
5.3 Capacity and Delivery Assurance
Capability Specification
Total injection molding machines 260 units
Clamping force range 30 to 2,800 tons
Global manufacturing footprint 4 facilities (China: Shenzhen, Dongguan, Hunan; Vietnam)
Total floor area 200,000+ square meters
Workforce 1,200+ employees
Annual turnover >1 billion RMB
Customer Value Translation: “With 260 machines across four factories, your production schedule is never capped by a single resource constraint. Peak demand is absorbed without lead time extension.”
5.4 Delivery and After-Sales Service
Standard international delivery:
DHL/FedEx air freight: 3–5 business days
Sea freight (full container): 20–35 days depending on destination
Mold creation lead time (standard): 10–45 days
After-sales service:
24-hour response commitment for technical inquiries
Dedicated customer support team in English and Chinese
Comprehensive mold operation and maintenance documentation provided with each shipment
Annual customer satisfaction review meetings for long-term partners
6. Closing Framework: Translating Technical Expertise into Customer Value
6.1 Capabilities and Value Translation Summary
Ansix Capability Problem Solved Cost Savings Risk Reduction
5-axis CNC (0.002mm accuracy) Parting line mismatch causing leakage No secondary deflashing ($0.02–0.05/part) No sealing failure returns
Mold flow analysis pre-design Weld lines, air traps, short shots Zero tooling rework ($5,000–15,000 per iteration) On-time sample delivery
2000-shot mold aging test Premature mold wear No unplanned maintenance downtime (3+ years stable production) Predictable production schedule
±0.02mm dimensional stability LCD panel fit issues No assembly rework ($0.01–0.03/unit) Zero customer assembly line stoppage
Cold-runner + valve-gate Material waste 30% LSR material savings (~$0.10–0.20/part) Lower total part cost
In-house mold repair (<24h) Long mold repair cycles No 2-week mold shipping delays <1 day production interruption
6.2 The “Mold as a Money-Printing Machine” Philosophy
For Ansix Tech, a mold is not simply a block of steel — it is a revenue-generating asset in the customer’s production line. Every design decision (steel selection, cooling channel layout, gate placement, venting strategy) is made with the customer‘s mass production in mind: plug-and-play mold performance, low flash across the entire shot count, extended service life between maintenance intervals.
7. Conclusion: Long-term Partner Value
With over 28 years of manufacturing experience, more than 30,000 mold sets delivered since 1998, and four production facilities across China and Vietnam, Ansix Tech has transformed complex silicone rubber overmolding challenges into reliable, cost-efficient, mass-production realities for clients worldwide.
Through early DFM engagement, precision mold manufacturing, process-controlled injection molding, end-to-end quality assurance, and responsive after-sales service, Ansix delivers not just silicone rubber gaskets for laptop LCD screens — but predictable supply chain outcomes that reduce customer cost, eliminate risk, and guarantee product performance.
References
Ansix Tech – Corporate Profile (www.ansixtech.com) : Provides company history, facility capacity (260 injection molding machines, 30-2,800 tons, 4 factories across China and Vietnam), certifications (ISO9001, IATF16949, ISO13485, ISO14001, BSCI), and workforce of 1,200+ employees.
Ansix Tech – Overmoulding Manufacturer (m.ansixtech.com) : Offers overmoulding solutions with thermoplastics, thermosets, rubber, and silicone for electronic components, automotive parts, medical devices, and consumer products.
Ansix Tech – PC/ABS Overmolding with LSR (m.ansixtech.com) : Documents 28+ years DFM expertise, in-house tooling facility, zero-defect production philosophy, and solutions that reduce total system cost and eliminate assembly failures.
Ansix Tech – LSR O-Rings and Gaskets (m.ansixtech.com) : Describes LSR material properties (–65°C to 150°C operating range, low compression set, biocompatibility), global LSR market size (USD 2.81 billion, 8.50% CAGR), and cost reduction through material and process optimization.
Ansix Tech – Zinc Alloy Housing Overmolding (m.ansixtech.com) : Details five strategic pillars translating technical excellence into measurable customer value, with 30,000+ mold sets delivered since 1998.
LSR Injection Molding Process Review (scholar.oversea.cnki.net) : Reviews LSR injection molding process phases including resin handling, plastication, injection, pack and hold, and curing.
LSR Injection Pressure Range (www.cirtecmed.com) : Documents typical LSR injection pressure range of 250 to 10,000 psi.
High Precision LSR LIM Molding (www.bossgoo.com) : Lists heat curing time parameters (56 seconds at 150°C–160°C) and achievable tolerances for compression silicone rubber molded parts.
DFM and Mold Flow Analysis (www.gv-mold.com) : Describes mold flow simulation for predicting weld lines, air traps, short shots, incomplete filling, and warpage.
Momentive Silopren LSR 3286/40 (www.matweb.com) : Documents self-lubricating LSR grade suitable for gasket applications.
Dow SILASTIC™ RBL-9200-65 LSR (matweb.com) : Describes improved flowability and extended pot life characteristics.
Dow SILASTIC™ RBL-9694-45M (www.dow.com) : Documents 45 Shore A, 1:1 mix ratio, heat-cured LSR for gasketing applications.
IOTA LSR 6330 (www.iotachem.com) : Describes 30 durometer liquid silicone rubber for sealing applications.
ASTM Standard for Silicone Rubber Gaskets (store.astm.org) : Specifies manufacturing requirements for dense elastomeric silicone rubber gaskets, including virgin polymer requirement and freedom from internal porosity and surface defects.
Rubber Injection Molding DFM Guide (www.rapiddirect.com) : Discusses thermodynamics of elastomer curing, DFM rules for rubber mold design, and thermal management differences between LSR and rigid plastics.
Final Statement to Customers
For us at Ansix Tech, a mold is not just a piece of steel — it is a revenue-generating asset designed to function as your money-printing machine. We plan for thermal balance, venting paths, and shrinkage compensation from day one, so your production line experiences plug-and-play performance, minimal flash, and extended tool life. If you have an existing product, we welcome the opportunity to walk you through a live DFM report, where you will see exactly how we eliminate weld lines, air traps, and shrinkage risks before you commit to tooling investment.
Ansix Tech Co Ltd
If you have any plans related to Silicone rubber gasket for laptop overmolded LCD screen , 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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