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Coffee Machine Tubing – Cold-Runner Molding Solution

Silicone tubing inside a coffee machine carries hot water, steam, and brewed coffee, often at 【90–130】°C and under pump pressure, thousands of cycles over the machine's life. The tube has to stay flexible, hold its bore dimension at the clamp and barb connections, resist compression set, and transfer no odor or taste into the beverage.

Extruded tubing cannot form the shaped ends, flanges, and molded connection features that modern brewing units need, and it varies in wall thickness along its length. Conventional compression molding leaves flash inside the bore and gate marks at the flow path, both of which cause leaks, pressure drop, and residue build-up.

TYM's solution molds the complete tube in an 8-cavity cold-runner mold on a vertical LSR injection molding machine, producing a finished, flash-free part with consistent bore and wall thickness straight out of the mold.

Cavities

8

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Silicone tube components of the coffee machine - TYM

Core Technology Breakdown

TYM Vertical LSR Injection Molding Machine

The vertical clamping layout suits insert overmolding. Plastic mask frames sit securely in the lower mold under gravity, which prevents insert shifting during injection.

- ▸ Vertical clamping and injection layout. Operators or robots can load inserts easily, and the frames stay stable during mold closing.
- ▸ Shuttle / dual-station lower mold option. One station is loaded with new frames while the other is molding, which cuts idle time between cycles.
- ▸ LSR metering and mixing system with a precision plunger injection unit.
- ▸ Closed-loop servo control keeps shot weight consistent across all 8 cavities.
- ▸ Low-pressure, controlled injection profile protects the plastic insert from deformation or damage.

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

Cold-Runner Precision Injection Control

8-Cavity Cold-Runner Overmolding Mold

- - ▸ Cold-runner system with needle-valve cold nozzles LSR stays uncured until it enters the cavity, so there are no runners to trim or scrap.
  - ▸ 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 8 cavities are qualified against the same drawing tolerance.
  - ▸ Mold temperature mapping across the 8 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
8-Cavity Output	Eight finished tubes per cycle on a single vertical 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.
No Deflashing Required	Parts come out of the mold finished, with no trimming or gate cutting.

Silicone tube injection mold for coffee machine - TYM

Technical Specifications

Parameter	Specification
Machine Type	TYM Vertical LSR Injection Molding Machine
Molding Process	LSR overmolding (insert molding)
Injection System	Servo-driven plunger, closed-loop control
Mold Cavities	8 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 vertical machine, the 8-cavity cold-runner overmolding mold, and the automation as one complete system from a single source. You do not need to source them from separate vendors.

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 8-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 tube diameters and lengths?

Yes. The mold is built to your drawing for bore diameter, wall thickness, length, and end features. Injection parameters are fully programmable for changeovers. For the best cycle time and tolerance, we recommend a dedicated mold per part number.

Why choose molded silicone tubing over extruded tubing?

Extrusion produces plain, constant-section tube only, and wall thickness varies along the length. Molding lets you form flanges, barb ends, elbows, and sealing features in one piece, with tighter and more repeatable dimensions, which removes downstream cutting and assembly steps.

Will the tubing affect the taste of the coffee?

No. We use platinum-cured, food-grade LSR, which leaves no peroxide residue and is odor- and taste-neutral. Post-curing can be added when your specification requires the lowest volatile content.

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.