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Baby Bottle Nipple – Horizontal Cold-Runner Automated Molding Solution

A baby bottle nipple is one of the most demanding parts in liquid silicone molding. It is thin-walled, deeply undercut, and every surface goes directly into an infant's mouth. The wall must be soft enough for natural sucking yet strong enough to resist tearing and biting. The vent and flow hole must be dimensionally repeatable, or feeding rate varies from bottle to bottle. And because the part is transparent, any flash line, gate mark, or flow mark is immediately visible to the consumer.

Compression molding and conventional injection leave flash around the flange and gate vestige on the tip, both of which must be trimmed by hand. Manual deflashing on a food-contact infant product adds labor cost, adds contamination risk, and can never be fully consistent.

TYM's solution molds the nipple in a 6-cavity cold-runner mold on a horizontal LSR injection molding machine, with automatic mold ejection that releases finished parts without an operator touching the mold.

Cavities

6

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Core Technology Breakdown

Horizontal LSR Injection Molding Machine

The horizontal layout is the right choice for a fully automatic, unattended nipple cell. The mold opens sideways, so ejected parts drop clear by gravity into a collection bin below, with no operator standing at the mold and no handling step in the cycle.

- ▸ Horizontal clamping with side mold opening. Parts fall free after ejection, which is what makes true lights-out operation possible.
- ▸ LSR metering and mixing system with a precision plunger injection unit.
- ▸ Low-pressure, profiled injection fills thin nipple walls completely without over-packing the flange or flashing the parting line.
- ▸ Integrated mold and injection unit temperature control holds even vulcanization from the tip to the flange, so hardness and elasticity do not vary within the part.

The machine delivers the steady clamping force and injection precision required for thin-wall, high-cavitation IV cannula connector molding.

6-Cavity Cold-Runner Mold — No Sprue, No Flash

- - ▸ 6-cavity cold-runner system with needle-valve cold nozzles LSR stays uncured in the runner, so there is no runner scrap and no material to recycle. Material utilization approaches 100%.
  - ▸ Sprueless, gate-free design. No gate vestige is left on the face-contact sealing lip.
  - ▸ Precision insert location. Each frame is positioned accurately so silicone wall thickness stays uniform around the whole face seal.
  - ▸ Tight shut-off at the plastic/silicone interface. Flash cannot creep onto the rigid frame or the canister connection area.
  - ▸ Optimized venting prevents trapped air at the deep contours of the nose bridge and chin.

Food-Contact Material Compliance

The rubber coating molding process is the heart of the system. Our design features:

- ▸ Food-grade and platinum-cured LSR. Platinum curing leaves no peroxide by-products, so there is no odor or taste transfer into water or coffee.
  - ▸ Materials available to FDA 21 CFR 177.2600, LFGB, and EU 10/2011 requirements depending on your target market.
  - ▸ Fully cured, low-volatile parts. Post-curing can be added when your specification calls for the lowest possible volatile content.
  - ▸ Stable at brewing temperatures. Silicone retains elasticity through repeated hot water and steam cycles, without hardening or cracking like many thermoplastic tubes.

Dimensional Consistency Control

A dedicated robotic pick-and-place system completes the automation loop:

- ▸ Cavity-by-cavity validation during sampling, so all 6 cavities are qualified against the same drawing tolerance.
  - ▸ Mold temperature mapping across the 6 cavities to keep shrinkage uniform.
  - ▸ Documented process parameters delivered with the mold, so production can be repeated exactly after any changeover or maintenance.

Key Benefits at a Glance

Benefit	Detail
6-Cavity Output	Six finished nipples per cycle on a single horizontal machine.
Zero-Waste Molding	Cold-runner needle-valve gating means no sprues, no runners, near 100% LSR utilization.
Clean Flow Path	Flash-free bore and gate-free surface prevent flow restriction, leaks, and residue build-up.
Molded-In Features	Supported core pins and balanced filling hold tolerance along the full tube length.
Food-Safe & Taste-Neutral	Platinum-cured, food-grade LSR compliant with FDA, LFGB, and EU standards.
Fully Automated	Mold ejection plus gravity drop means true lights-out operation with no handling step.

Infant silicone nipple injection mold - TYM

Technical Specifications

Parameter	Specification
Machine Type	TYM Horizontal LSR Injection Molding Machine
Molding Process	LSR Injection Molding
Injection System	Servo-driven plunger, closed-loop control
Mold Cavities	6 cavities, cold-runner design
Gate Type	Needle-valve cold nozzles
Gate/Flash Condition	Sprueless, no flash
Material	Self-adhesive Liquid Silicone Rubber (LSR)

One Supplier. One System. One Guarantee.

We deliver the horizontal machine and the 6-cavity cold-runner mold, including the ejection system, as one matched package from a single source, instead of leaving you to coordinate between a machine vendor and a mold shop.

No Integration Headaches:

The machine and mold are designed together to ensure optimal performance and seamless compatibility.

Single-Point Responsibility:

We take full accountability for the overall quality, performance, and after-sales service of the entire system.

Pre-Tested and Validated:

The complete system is rigorously tested, tuned, and validated as a single functioning unit before delivery.

Faster Ramp-Up:

With process parameters already configured, your team can start mass production within days of installation.

Proven in Production

Our 6-cavity LSR tube solution is running in production and delivers:

High Yield Rate:

Consistently achieves industry-leading pass rates during both visual and dimensional inspections.

Uniform Seal Thickness:

Precise insert location and balanced filling keep the face seal consistent for reliable fit.

Minimal Post-Processing Requirement:

Produces flash-free parts with minimized gate marks, reducing the need for deflashing or gate trimming.

Long-Term Process Stability:

Sprueless cold-runner design maintains stable output without process drift over extended production runs.

Made for Global Standards

CE-Certified Safety

All electrical components and integrated safety systems are fully CE-certified, guaranteeing safe and reliable operation in global manufacturing environments.

FDA & EU Compliant Processing:

Engineered to meet strict hygiene standards, our system is fully capable of processing food-grade and medical-grade LSR materials compliant with FDA and EU regulations.

ISO 9001 Quality Management:

Our entire workflow—from initial R&D and mold design to manufacturing and final testing—is strictly governed by ISO 9001 quality management protocols.

Comprehensive Global Support:

We provide complete English technical documentation, intuitive English PLC interfaces, and highly responsive global technical support for commissioning and troubleshooting.

Frequently Asked Questions

Projects

Can this system produce different nipple shapes and flow rates?

Yes. The mold is built to your drawing for nipple profile, wall thickness, flange diameter, and vent/flow hole configuration. Slow, medium, and fast flow versions are normally handled with dedicated cavity inserts or dedicated molds. We recommend a dedicated mold per model for the best cycle time and tolerance.

How reliable is automatic demolding on such a soft, undercut part?

This is the core of the mold design. The stripper system spreads demolding force evenly around the flange, and air assist breaks the vacuum at the core so the part releases without stretching or tearing. We validate release over a continuous unattended run before shipment.

Are the flow holes molded in or cut afterwards?

Both approaches are possible depending on your design and hole size. We will review your drawing and advise whether the hole should be molded directly or formed in a separate automated step, along with the dimensional tolerance each approach can hold.

What training and support do you provide?

We provide on-site training for operators and maintenance technicians, complete documentation (machine manual, mold maintenance guide, process parameters), and remote technical support. Our engineers are available worldwide for on-site commissioning and troubleshooting.

Ready to Transform Your Nipple Production?

Contact us today for a free consultation, process analysis, and quotation.

We can provide production simulations, sample molding, and ROI projections tailored to your specific requirements.