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Medical Tube Mould for Collecting Biological Samples

Medical test tubes are common laboratory instruments used in medical, testing, and scientific research fields. They are primarily designed for collecting, storing, mixing, or culturing biological samples (such as blood, urine, saliva, cells, reagents, etc.). Typically made of glass or polymer materials (e.g., polyethylene, polypropylene), they feature strong chemical stability, high temperature resistance, and good light transmittance, preventing sample contamination or component changes.

Medical test tubes are categorized by purpose into general test tubes, centrifuge tubes, anticoagulant tubes (containing anticoagulants), culture tubes, etc., with various specifications (e.g., capacities ranging from 1 to 50mL). They are used with tools like test tube racks and clamps, and must be operated under sterile conditions to ensure the accuracy and safety of experimental results. As essential basic tools, medical test tubes play a crucial role in clinical diagnosis, disease screening, and biological research.

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Introduction of PET Test Tube Mould

We can produce: medical supplies molds, medical plastic molds, medical equipment molds, disposable blood transfusion, liquid appliance injection molds, medical drop bottle molds, medical bottle molds, health care bottle molds, laboratory supplies molds, medical test tube molds, Medical molds, pharmaceutical preform molds, pharmaceutical bottle cap molds, medical plastic packaging molds, sheath stripping molds, large needle sleeve molds, needle holder large core molds, long cavity molds, needle holders, strip molds, protection Set of pull sleeve mold, sheath gate mold, needle seat needle mold, vibration small core mold, pull rod mold, sheath mold, needle seat cavity mold, needle seat.

Medical tube mould

Product Features

Mold ranges from 1 cavity to 72 cavities.
The mold plate is made of stainless steel.
Standard interchangeable mold component.
High performance hot runner system ensures uniform melt flow and pressure in all cavities.
All of parts are manufactured by CNC equipments.
Advanced structure is designed consulting European cap mold.
Mold cavity and Core are made of steel with fine polishing, high hardness and anti-corrosion to get mold's high precision and good quality.
Pneumatic drive the nozzle pin for simultaneous high-speed open and close actions.
Patent designed rectifying system is adopted to lessen the possible preform thickness problem happening during production.
Special designed water hoses eliminate leakage and water marks on preform.
Mold flow analysis reduce AA level.
Long using life over 2.5 million times of injection cycle.

Overall Structural Framework of the Mold

The medical PET test tube mold adopts a two-plate mold structure, consisting of a fixed mold (front mold), moving mold (rear mold), guiding and positioning system, temperature control system, gating system, and ejection mechanism. The fixed and moving molds are guided by 4 sets of high-precision guide pillars and bushings (with a fit clearance ≤ 0.003mm) to ensure accurate alignment of the cavity during mold clamping, preventing uneven wall thickness of the test tube due to misalignment. The number of mold cavities is usually 4 or 8 (balancing efficiency and precision). The cavity and core are of an integral structure (to avoid joint seam affecting transparency) and are made of S136H mold steel (quenched to HRC50-52), polished to a mirror finish (Ra ≤ 0.01μm) to ensure a smooth, flawless inner wall of the test tube.

Products Display

The design of medical PET test tube molds must balance high-precision molding, transparency, and shatter resistance, while adapting to the low flowability of PET materials.

Medical Tube Mould

Targeted Designs Adapting to PET Characteristics

1. Improving Poor Flowability: In addition to increasing the size of runners and gates, a fillet (R0.5mm) is set at the cavity inlet to reduce melt impact and turbulence when entering the cavity; an auxiliary runner groove (depth 0.2mm) is set in the middle of the core to guide the melt to fill evenly to the tube top.
2. Ensuring Uniform Wall Thickness: The cavity and core adopt concentricity control (coaxiality ≤ 0.005mm). Three-coordinate measurement is used to ensure the wall thickness deviation of test tubes formed in each cavity is ≤ 0.1mm, avoiding shattering due to local thinness or uneven cooling due to excessive thickness.
3. Enhancing Shatter Resistance: The test tube bottom is designed with a circular arc transition (R1.5mm) to avoid right-angle stress concentration; the corresponding position at the bottom of the mold cavity is polished to a mirror finish to ensure uniform PET crystallization here and enhance impact resistance.

Precision Control and Verification

After mold assembly, coordinate measuring machines are used for full-size inspection. Key dimensions such as cavity diameter, depth, and taper are controlled within a tolerance of ±0.005mm. During test molding, 3 test tubes are sampled from each cavity to test light transmittance (≥90%), wall thickness deviation, and impact strength (no breakage in a 1.2m drop test) to ensure compliance with medical-grade requirements.

This structural design not only solves the problem of poor PET flowability but also ensures the transparency, wall thickness stability, and shatter resistance of the test tube through high-precision molding and uniform cooling, fully meeting the needs of medical scenarios.

Design and Function of Key Components

Cavity and Core (Core Molding Parts)

Cavity (for forming the outer surface of the test tube): The inner wall is gradually polished to ensure uniform polishing precision from the inlet to the bottom, avoiding uneven light refraction that affects transparency. The cavity depth is 0.5mm longer than the actual length of the test tube (to reserve for shrinkage), and the inner wall taper is controlled at 0.5° (facilitating demolding and compensating for PET cooling shrinkage).
Core (for forming the inner surface of the test tube): Adopts a stepped design. The diameter precision at the top (test tube opening) is controlled within ±0.01mm. The clearance between the middle wall thickness forming section and the cavity is strictly controlled at 0.8-1.2mm (depending on the test tube specifications, ensuring the wall thickness is uniform and meets the "not too thin" requirement; usually, the test tube wall thickness is designed to be 1.0-1.5mm). The core surface is chrome-plated (thickness 0.005-0.01mm) to enhance wear resistance and demolding performance, preventing PET melt adhesion that affects transparency.

Gating System (Adapting to Low-Flow PET)

A hot runner system (single-cavity independent hot nozzle) is adopted, with the hot nozzle temperature controlled at 270-290℃ (higher than the PET melting point of 250-260℃) to prevent melt solidification in the runner. The hot nozzle diameter is designed to be Φ3-4mm (20% larger than ordinary runners) to reduce flow resistance.
The gate is located at the center of the test tube bottom (submarine gate) with a diameter of Φ1.5-2mm, ensuring the melt fills the cavity through the shortest path and reducing flow distance. The runner cross-section is circular (diameter Φ8-10mm), reducing flow resistance by 30% compared to rectangular runners.

Temperature Control System (Ensuring Molding Stability)

Both the cavity and core are equipped with spiral cooling water channels. The cavity water channel is close to the surface (5-8mm from the cavity wall), and the water temperature is controlled at 60-70℃ (higher than the PET glass transition temperature to reduce internal stress). The temperature difference between the inlet and outlet of the water channel is ≤ 2℃ to avoid test tube deformation or reduced transparency due to uneven cooling.
A thermal insulation pad (3-5mm thick, made of titanium alloy) is installed between the hot runner and the cavity to prevent heat transfer from the hot runner to the cavity, which would affect cooling efficiency.

Ejection Mechanism (Avoiding Product Damage)

A push tube ejection is adopted (an annular push tube is arranged around the core). The fit clearance between the push tube and the core is ≤ 0.005mm, and the ejection stroke is 10mm longer than the test tube length to ensure smooth demolding. The contact area between the top of the push tube and the test tube bottom is ≥ 5mm² to avoid crushing the test tube or leaving marks during ejection.
The ejection speed is controlled at 5-10mm/s (slow start to avoid PET material whitening due to pulling). After ejection, the test tube is picked up by a mechanical hand with negative pressure to reduce contamination from manual contact.

Ventilation System (Solving Melt Venting Problems)

Vents are arranged at the end of the cavity (test tube bottom) and the parting surface, with a depth of 0.01-0.015mm (smaller than the PET melt flash value of 0.02mm) and a width of 5-10mm, ensuring smooth discharge of air and volatile components in the cavity to avoid bubbles or scorch marks affecting transparency and strength.

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