Bottle cap inner stopper 18 20 24 28 Dental plastic inner stopper Cosmetic plastic bottle sealing inner stopper
FEATURES
Automated Machining Ratio of 70%: High automation reduces human error and ensures consistency across mold components.
Customer Value: Predictable mold quality, faster delivery (reducing mold fabrication lead time by 15–20%), and reduced risk of assembly mismatches that could otherwise delay your product launch.
1.2 Injection Molding Machine Fleet — Consistency from the First Shot to the Last
Ansix Tech operates 260 injection molding machines with clamping forces from 30 to 2,800 tons, covering every product size from miniature caps for personal care products to large closures for industrial containers. Our primary machines include FANUC, Sumitomo, Toshiba, Nissei, Engel, and ARBURG.
Tonnage Range Application
30–150 tons Small cosmetic caps, pharmaceutical closures, fine-thread precision parts, inner stoppers 18mm-28mm
150–800 tons Standard beverage bottle caps, sports cap closures, medium-sized packaging components
800–2,800 tons Large industrial caps, pail closures, multi-cavity high-volume production
All-Servo Electric Drive Systems: Our machines are equipped with all-servo motor drives delivering repeatable precision of ±0.1%.
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Mold Description
Product Materials:
PP
Mold Material:
S136ESR
Number of Cavities:
32
Glue Feeding Method:
Hot runner
Cooling Method:
Water cooling
Molding Cycle
9.5s
- The mold manufacturing process and product material selection
Customer Value: Multiple production runs over weeks or months produce identical bottle cap inner stopper dimensions. Your capping machinery will seat caps with consistent torque, reducing waste from improper seals. Energy consumption is significantly lower than hydraulic alternatives, directly reducing your per-part electricity cost by approximately 30–40%.
1.3 Inspection and Quality Equipment — Data-Driven Validation for Defect-Free Production
Ansix Tech has successfully passed ISO9001, IATF16949, ISO13485, and ISO14001 certifications, with ISO Class 8 cleanrooms and GMP standard workshops.
CMM (Coordinate Measuring Machine) and Optical Inspection System: Every mold that leaves our facility undergoes full dimensional reporting against customer specifications. Critical dimensions are validated with CPK ≥ 1.33 before production approval.
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Customer Value: Zero dimensional surprises during your production validation. For bottle cap inner stoppers, which typically require internal dimension tolerances of ±0.15mm (thread inner diameter, inner stopper outer diameter, top wall thickness) and external dimensions within ±0.30mm (cap outer diameter, overall height), our measurement systems ensure every part meets specification before shipment.
Section 2: Mold Manufacturing Core Competencies — Customer Value Delivered Through Measurable Metrics
What customers truly care about: tool life, dimensional precision, delivery speed, and maintenance costs. Below is how we translate these technical metrics into customer value.
2.1 Mold Steel Selection — Balancing Durability and Cost
Steel Grade Hardness Application Life Expectancy
P20 (Pre-hardened) 30-32 HRC Large cores/cavities for non-abrasive materials 500,000-1,000,000 cycles
S136ESR (Stainless) 48-52 HRC High-gloss finish, cosmetic caps, pharmaceutical components 1,000,000+ cycles
2344 / 8407 / H13 (Hot Work) 46-52 HRC Hinges, sliders, wear-critical components 500,000+ cycles
SKD11 / DC53 58-62 HRC High-wear applications, glass-filled materials 300,000-500,000 cycles (GF materials)
NAK80 37-43 HRC High-gloss and pre-hardened applications 500,000-800,000 cycles
M340 / 4Cr13 / 9Cr18 48-52 HRC Corrosion-resistant, medical/pharmaceutical applications 800,000+ cycles
For high-volume production of dental plastic inner stoppers and cosmetic bottle sealing inner stoppers, Ansix typically selects P20 for large cores/cavities and H13 for hinges and sliders that experience high wear.
Customer Value: Glass-filled materials (GF) guaranteed for 500,000 cycles; standard plastics for 1,000,000+ cycles. Every mold is delivered with steel certification and heat treatment documentation, enabling you to calculate exact per-part amortized tooling costs and budget maintenance intervals with confidence.
2.2 Achievable Tolerances
Component Type Achievable Tolerance Customer Value
Standard structural parts ±0.05mm Reliable assembly fit, reduced scrap
Precision gears / medical components ±0.005mm Guaranteed functionality for critical applications
Multi-cavity cavity-to-cavity variation ≤0.01mm Cap #1 fits same bottle neck as cap #48
2.3 Mold Type Offerings
Mold Type Efficiency Gain Customer Value
Hot runner system Eliminates cold runner waste Reduces material cost per part by 15–25%, faster cycle times
Stack mold (2-layer, 4-layer) Doubles or quadruples output per machine Increase production capacity by 100-300% without additional molding machines
2K / multi-material molds Overmolding in one cycle Eliminates secondary assembly operations, reduces labor cost
High-gloss molds (Ra<0.05μm) Produces transparent/glossy finish without secondary polishing Eliminates post-molding surface finishing — reduces cosmetic product cost
For PET transparent caps, we recommend hot runner systems that keep plastic molten within the runner, eliminating cold runner waste and reducing the need for recycling.
2.4 Gating Strategy — Filling Balance Without Defects
Through advanced mold flow analysis (Moldex3D, Moldflow), we simulate the entire injection process before cutting steel. Engineers analyze fill patterns, cooling rates, weld line positions, and potential air traps.
Customer Value: Pre-identified weld lines, gas traps, and sink marks mean zero surprise defects during production trials. This virtual optimization is the first step in cost savings — avoiding costly mold rework and production delays. For bottle cap inner stoppers, we optimize gate count and location to ensure filling balance across all cavities, eliminating short shots and reducing scrap rates below 1%.
2.5 Lead Time Standards
Mold Complexity Standard Lead Time Rush Lead Time*
Simple molds 10 days —
Medium complexity 25-45 days 20 days
High complexity 45-60 days 35 days
*Rush conditions require 24-hour machining shifts but never bypass mold validation steps (T0, T1, T2, T3 sampling). Customer value: Faster time-to-market without quality compromise.
2.6 Advanced Cooling System Design — The Hidden Driver of Efficiency
Proper cooling channel layout determines cycle time, part quality, and dimensional stability. Our cooling design philosophy:
Design Element Implementation Customer Value
Conformal cooling channels 3D-printed conformal channels following part contour 30-50% shorter cycle time, reduced warpage
Controlled core/cavity temperature difference Within 2°C through zone-controlled mold temperature controllers Minimized warpage and sink marks
High-efficiency water manifolds Individual cavity flow control Reduced part shrinkage variation across cavities
For bottle cap inner stopper molds, we design cooling circuits specifically matched to the geometry of the sealing lip and sidewall thickness to achieve:
Target cooling time: 3–8 seconds depending on part wall thickness
Overall cycle time target: 10–15 seconds for 24- to 48-cavity molds
Customer Value: Lower per-part energy cost, higher daily output, and faster ROI on your tooling investment.
Section 3: Injection Molding Process Control — Eliminating Customer Quality Anxiety
What customers fear most: sink marks, flash, dimensional instability, and batch-to-batch color variation.
3.1 Process Standardization — MES-Locked Parameters for Zero Variation
All injection molding machines at Ansix Tech are networked to our MES (Manufacturing Execution System). Molding parameters — temperature, pressure, speed, cooling time — are locked and can only be adjusted by authorized engineers.
Customer Value: First-piece and last-piece inspection for every batch ensures run-to-run consistency. No gradual process drift. No "mystery batches" that fail incoming inspection.
3.2 Dimensional Stability Control — Active Process Compensation
Control Method Implementation Customer Value
Mold temperature zone control Core/cavity temperature controlled separately, ΔT < 2°C Minimized warpage — reduces post-molding straightening costs
Ultrasonic wall thickness sensor Real-time thickness feedback + automatic packing pressure compensation Dimensional stability across entire production run
In-mold temperature/pressure sensors Closed-loop feedback for packing/holding phases ±0.02mm critical dimension stability over 3 consecutive weeks
Customer Value: For a typical bottle cap inner stopper (thread inner diameter, inner stopper outer diameter), key dimension fluctuation ≤0.02mm across multi-day production runs.
3.3 Surface Finish Standards — Eliminating Secondary Operations
Surface Grade Application Achievable Parameter Customer Value
Standard SPI B-1 Food/beverage caps Ra 0.8-1.6μm Good enough for most industrial caps
High-gloss SPI A-1 Cosmetic caps, dental inner stoppers, transparent parts Ra ≤0.05μm No post-molding polishing — reduces part cost by 10-15%
Textured SPI D-1 Matte finishes, grip surfaces Uniform texture depth Consistent visual appearance batch after batch
Transparent bubble-free PET, PC, acrylic Zero bubbles, zero flow lines Eliminates inspection sorting costs
For tooth-colored dental plastic inner stoppers requiring plating or printing, we can incorporate warp compensation in mold design to achieve printing registration within ±0.1mm.
3.4 Special Materials Processing Capabilities — Proven Across Industries
Material Category Specific Grades Process Challenges Mastered
Engineering thermoplastics PC/ABS, PC, PBT, PA6+GF30 Weld line strength, glass fiber orientation control, tool wear
High-temperature materials PEEK, PEI, PPS+40%GF, LCP Mold temperature up to 180°C, thermal expansion management
Food/pharma contact PP (homopolymer/copolymer), HDPE, LDPE, LLDPE Organoleptic property control, ultra-low particulate
Fluoropolymers PTFE, PFA, PVDF Sintering vs. melting behavior, corrosion-resistant tooling
Liquid silicone rubber LSR (2-component) Precision shot volume, flash-free parting lines
Medical grades ABS medical, PC medical, PP medical Validation-ready documentation, cleanroom production
Customer Value: UL94 V-0 flame rating for electrical applications; UV resistance (3,000 hours no discoloration) for outdoor caps. For dental and pharmaceutical inner stoppers: ISO13485-certified cleanroom manufacturing with full material traceability.
Section 4: End-to-End Service — Reducing Your Management Cost (Often Overlooked by Competitors)
4.1 Early Engagement (DFM Report) — Prevent Problems Before They Exist
Before we cut steel, we provide a comprehensive Design for Manufacturing (DFM) analysis report that translates part geometry into manufacturable tooling:
DFM Analysis Element What We Identify Customer Value
Draft angle verification Undercuts and insufficient draft angles (0.5°-3° recommended) Avoids mold redesign after tooling — saves
5
,
000
−
5,000−15,000 in rework
Wall thickness optimization Thin-to-thick transitions causing sink marks Prevents cosmetic rejections before production starts
Gate location optimization Weld line positions, air trap locations No unexpected strength weak points in sealing lip
Ejector pin mark placement Cosmetically-sensitive areas Zero visible marks on visible surfaces of cosmetic caps
Material shrinkage compensation 0.4-2.2% shrinkage depending on material (PP: 1.2-2.2%, HDPE: 1.5-4.0%) Part fits mating components on first shot
Customer Value: One DFM review session can prevent three to five mold iterations, saving 4-8 weeks of project timeline and
10
,
000
−
10,000−30,000 in unnecessary tooling modifications.
4.2 Trial Molding and Samples — Iterate Before You Commit
Milestone Deliverable Customer Value
T0 sample First shots from new mold Physical parts for fit/function testing
T1-T3 improvements Sample set + improvement report per iteration Visible progress tracking before mass production
Insert-change validation Quick-change cavity/insert testing Validate design variations without building new mold
Customer Value: Your team validates form, fit, and function before committing to full-scale production. For bottle cap inner stoppers, we provide sealing performance testing data before volume production begins.
4.3 Small-Batch Validation — Confirm Stability Before Ramp-Up
Before releasing to mass production, we offer 100–500 piece trial runs with statistical process data.
Customer Value: You receive actual CPK values for all critical dimensions. You approve production readiness based on data, not promises. No "we'll figure it out at volume" surprises.
4.4 Maintenance and Spare Parts — Long-Term Partnership
Service Commitment Customer Value
Spare parts delivery Ejector pins, core inserts, wear plates delivered with mold Reduced downtime during maintenance events
Scheduled maintenance Every 200,000 cycles or as specified Extended mold life — lower replacement cost
Repair service (after warranty) At cost + labor only Transparent pricing, no "surprise" capital outlays for premature tool replacement
Customer Value: predictable maintenance costs, reduced emergency mold repairs, and lower amortized tooling cost per part over the life of the mold.
Section 5: Differentiated Commitments — Addressing Common Customer Pain Points Directly
Instead of generic claims, here are our specific responses to common industry complaints:
Customer Complaint Ansix Tech Commitment Why We Can Make This Promise
"My mold breaks down constantly" Pre-delivery 2,000-cycle wear test + wear report; 3-year mold structural warranty (excluding normal consumable wear) Our steel selection, heat treatment, and runner balance ensure predictable life
"Excessive flash increases my deburring labor cost" Mold splits machined to 0.005mm fit precision + self-locking clamp force compensation Flash controlled to <0.03mm per batch — eliminates manual deburring
"Dimensions change every production run" Ultrasonic wall thickness sensors + real-time packing pressure compensation; in-mold temperature/pressure sensors with closed-loop control Dimensional stability within ±0.02mm across batches
"Mold repairs take too long" In-house EDM machining center and spark EDM workshop; most mold repairs never leave our facility — welding/insert changes restored within 24 hours Reduced production downtime — faster back-to-production
"My supplier can't run glass-filled materials without excessive tool wear" Mold steels selected for GF applications (SKD11, DC53, H13); wear surfaces hard-coated where needed 500,000-cycle guarantee for GF materials — not just an aspiration
Our core philosophy: A mold is not just a block of steel. It's a profit engine. When we design and build your bottle cap inner stopper mold, we simultaneously plan for the production line: robustness, venting paths, temperature balance, and ejection smoothness. Your production line receives molds that are ready to run — low flash, low maintenance, and high longevity.
We invite you to experience our DFM process with one of your existing parts. You will see firsthand how we identify and eliminate weld lines, gas traps, and sink marks before they ever reach your production line.
Product Specifications — Bottle Cap Inner Stopper Sizes 18/20/24/28
Ansix Tech manufactures bottle cap inner stoppers and sealing inner stoppers in standardized diameters of 18mm, 20mm, 24mm, and 28mm — the industry-standard sizes for cosmetic bottles, dental product containers, pharmaceutical vials, and industrial packaging applications. These sizes are compatible with most bottle neck finishes including GPI 400 neck finishes (18mm-400, 20mm, 22mm, 24mm, 28mm).
Material Selection for Inner Stoppers — Scientific Basis for Performance
Material Density (g/cm³) Hardness/Stiffness Key Properties Typical Application
HDPE 0.940-0.966 Rigid, high tensile strength (4,400 psi yield) Excellent chemical resistance, cold resistance, tough, translucent Primary inner stopper material for pharmaceutical/dental; offers rigidity + sealing
LDPE 0.910-0.940 Flexible, lower strength (1,900 psi) Excellent flexibility, chemical resistance, good heat seal property Squeeze dispensing inner seals, soft push-in fit applications
PP 0.90-0.91 Balanced stiffness/flexibility Dimensional stability, cost-effective, excellent heat resistance High-volume bottle cap inner stoppers, food contact applications
PE Blend (HDPE/LDPE) Variable Tailored stiffness/flexibility Crack resistance, flexibility, good processing Closure inner seals requiring both toughness and flexibility
HDPE offers a tight molecular structure giving higher density than other polyethylenes, making it highly durable, rigid, and opaque — ideal for inner stoppers requiring structural integrity. LDPE provides flexibility, durability, and chemical resistance — better for push-in fit applications where the stopper must conform to bottle neck variations.
Critical sealing parameters for inner stoppers:
Hardness (Shore D): 55-70 for HDPE; 45-55 for LDPE
Compression set recovery (ASTM D395): <15% after 22 hours at 50°C
Water absorption (ASTM D570): <0.01% — ensures dimensional stability in humid environments
Melt flow index (MFI): 2-10 g/10min for injection molding grades
Production Overview
Each bottle cap inner stopper is injection molded using precision multi-cavity tooling (16 to 48 cavities), with cycle times optimized to 8–15 seconds depending on part geometry and material selection. All production takes place in ISO-certified facilities (ISO9001, IATF16949, ISO13485, ISO14001) with 260 injection molding machines ranging from 30 to 2,800 tons.
Quality inspection regime for inner stoppers:
Inspection Parameter Tolerance/Acceptance Criterion Method
Inner stopper outer diameter ±0.15mm CMM / optical comparator
Wall thickness ±0.05mm (critical sealing lip: ±0.02mm) Ultrasonic gauge
Part weight ±0.10g High-precision balance
Flash thickness <0.03mm Visual + microscope
Sealing lip integrity No cracks, bubbles, or deformation 10x magnification inspection
Color consistency ΔE<1.0 per batch Spectrophotometer
Cost Reduction — How Ansix Tech Reduces Customer Hard Costs
From material selection through process optimization, we systematically reduce your per-part cost:
Material optimization (5-15% cost reduction) — Strategic selection of base polymers with appropriate fillers while maintaining all functional requirements
Cycle time reduction (10-25% efficiency gain) — Optimized cooling channel design and process parameters reduce per-part production time
Multi-cavity productivity (200-400% capacity gain vs. single-cavity) — Up to 48 cavities per mold maximizes output per machine hour, reducing piece price through economies of scale
Zero-waste production (15-25% material savings) — Hot runner systems eliminate cold runner scrap; closed-loop process control minimizes reject rates below 1%
Automated downstream handling (10-20% labor cost reduction) — Robotic part removal, conveyor integration, and automated packaging
Global manufacturing footprint (China + Vietnam) — Strategic location optimization for logistics and labor costs
The combination of these strategies can reduce your landed part cost by 20-40% compared to conventional manufacturing approaches. Ansix Tech's expertise typically enables custom formulation or strategic selection of cost-effective materials that meet all functional requirements, directly reducing unit cost.
Delivery Lead Times — Quality Without Delay
Phase Delivery Timeline
DFM analysis and approval 5-7 days
Mold fabrication (standard) 25-45 days
T0-T3 sampling and iteration 7-10 days
PPAP / first article approval 3-5 days
Mass production ramp-up 1-2 weeks
Quality Assurance — Complete Traceability and Validation
Every mold is 100% inspected before shipment with full dimensional report and CPK documentation. Ansix Tech holds ISO9001 (quality management), IATF16949 (automotive), ISO13485 (medical devices), and ISO14001 (environmental) certifications.
Production environment: ISO Class 8 cleanroom + GMP standard workshops
Industry 4.0 integration: Smart manufacturing equipment and automated injection molding workshops
Inspection equipment: CMM (Coordinate Measuring Machine), optical vision inspection system, 100% automated dimensional verification available
Quality commitment: Zero-defect policy for critical sealing surfaces
Ansix Tech Company Background
Ansix Tech is a professional manufacturer specializing in plastic mold and product R&D, design, manufacturing, sales, and service. The company is committed to providing customers with high-quality, high-tech, and competitive products.
Founded: 1998 in Hong Kong by Mr. Huang
Subsidiaries: Shenzhen, Dongguan, Hunan, Vietnam
Total factory area: Over 200,000 square meters
Employees: Over 1,200
Injection molding machines: 260 units (30 to 2,800 tons) — primary machines: FANUC, Sumitomo, Toshiba, Nissei, Engel, ARBURG (LSR, 2K), Haitian, Taichung
Certifications: ISO9001, IATF16949, ISO13485, ISO14001
Experience: Over 28 years in precision injection molding
Molds built to date: Over 30,000
Design engineers: Over 200 dedicated
Ansix follows the principle: "Marketing-oriented, quality survival, technology development, service development, mutual benefit as the goal".
For further information: email info@ansixtech.com — our team will respond within 12 hours.
Summary
Ansix Tech delivers measurable customer value through:
Customer Need Ansix Tech Solution Measurable Outcome
Mold longevity Premium steel selection (P20, S136, H13, SKD11, DC53) 500,000-1,000,000+ cycles
Dimensional precision ±0.002mm machining, ±0.1% injection repeatability CPK≥1.33 guaranteed
Lower per-part cost Hot runner + multi-cavity + cycle optimization 20-40% cost reduction vs. conventional
Faster delivery 70% automated machining, 4 global facilities Simple molds: 10 days; complex: 25-45 days
Quality confidence ISO9001, IATF16949, ISO13485, ISO14001 Full traceability + PPAP package
Reduced risk Pre-production DFM analysis + T0-T3 sampling Problems identified before tooling
Lower management cost Full-service: design → mold → molding → assembly Single-source accountability
Our final message to customers: For us, a mold is not a block of steel. It is a profit engine. When we design your mold, we simultaneously plan for production line robustness, venting paths, temperature balance, ejection smoothness, and automated handling. Your production line receives molds that are ready to run — low flash, low maintenance, and high longevity.
We invite you to experience our DFM process with one of your existing parts. You will see firsthand how we identify and eliminate weld lines, gas traps, and sink marks — saving you time, money, and risk before production ever begins.
Ansix Tech — Make Our Customers Successful
Ansix Tech Co Ltd
If you have any plans related to Bottle cap inner stopper 18 20 24 28 Dental plastic inner stopper Cosmetic plastic bottle sealing inner stopper , 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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