Information on the most widely used ASTM standards within the materials testing industry
Model: UT1029B-A305; ISO 17555, ISO 15987, ISO 15988
Film Biaxial Stretch Tensile Testing Machine / Cross-type four-axis planar biaxial tensile testing machine (Also known as: four-axis biaxial tensile tester, film biaxial tensile testing machine, cross biaxial tensile machine, biaxial elongation tester, biaxial tensile tester), the device uses an X-Y orthogonal cross layout with four independent servo stretching axes (X, X-, Y, Y-). The sample is a cross-shaped film, with each of the four arms held by a set of clamps. The two axes can be independently closed-loop controlled, allowing for equal biaxial (1:1 synchronous stretching) or unequal biaxial (1:2, 2:1, or uniaxial) loading. This perfectly simulates the bidirectional stress conditions in film blowing, thermoforming, and packaging, making up for the limitation of uniaxial stretching that only provides data in one direction.
Mainly used for mechanical performance testing and analysis of uniaxial and biaxial stretching of non-metallic materials such as PET, PA, PP, PS, and EVA. It has three closed-loop control modes: stress, strain, and displacement, and can determine parameters like maximum force, tensile strength, bending strength, compressive strength, elastic modulus, elongation at break, yield strength, constant deformation elongation, constant force elongation, as well as the relationship between specified force and deformation.
ISO 17555 Biaxially oriented polypropylene (BOPP) film for general purposes
ISO 15987 Plastics - Film and sheeting - Biaxially oriented polyamide (nylon) films
ISO 15988 Plastics - Film and sheeting - Biaxially oriented poly(ethylene terephthalate) (PET) films
General introduction
Film Biaxial Stretch Tensile Testing Machine / Cross-type four-axis planar biaxial tensile testing machine (Also known as: four-axis biaxial tensile tester, film biaxial tensile testing machine, cross biaxial tensile machine, biaxial elongation tester, biaxial tensile tester), the device uses an X-Y orthogonal cross layout with four independent servo stretching axes (X, X-, Y, Y-). The sample is a cross-shaped film, with each of the four arms held by a set of clamps. The two axes can be independently closed-loop controlled, allowing for equal biaxial (1:1 synchronous stretching) or unequal biaxial (1:2, 2:1, or uniaxial) loading. This perfectly simulates the bidirectional stress conditions in film blowing, thermoforming, and packaging, making up for the limitation of uniaxial stretching that only provides data in one direction.
Mainly used for mechanical performance testing and analysis of uniaxial and biaxial stretching of non-metallic materials such as PET, PA, PP, PS, and EVA. It has three closed-loop control modes: stress, strain, and displacement, and can determine parameters like maximum force, tensile strength, bending strength, compressive strength, elastic modulus, elongation at break, yield strength, constant deformation elongation, constant force elongation, as well as the relationship between specified force and deformation.
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The four-axis stretching machine can stretch thick film samples made from thin film materials under 2 mm thick and 70-100 mm square. It can perform film stretching experiments at the required stretch ratio, suitable temperature, and time, providing samples for lab physical and chemical testing. Based on the sample performance, a variety of additives and formulations can be determined. When applied to production lines, it can greatly reduce trial costs. Any thick sheet made from crystalline or amorphous polymers suitable for biaxial stretching can be statically stretched on this machine.
This system can perform synchronous stretching as well as asynchronous stretching, meaning when different stretching speeds are set for X and Y, it can show how the material deforms under force and how the force value decreases.
Main features
The main machine uses a metal frame structure, which is stable and reliable. The high-precision loading control mechanism is made up of a servo motor, reducer, and ball screw, driving the chuck to move back and forth to apply load to the cross. The X/Y-direction ball screws are installed strictly at 90-degree orthogonal angles, with the X/Y axes of the four-way chuck installed coaxially to ensure a uniform force plane during stretching.
1) Four-way synchronized loading (in-situ stretching, the sample stays in place, and the system automatically adjusts based on relative force and point relative displacement, providing uniform speed displacement for synchronized loading, ensuring balanced force on the sample in the stretching area).
2) Four-way servo motor independent loading control, with feedback for force measurement in the orthogonal XY axes, ensuring synchronization/asynchronization and stable tension-holding force during loading.
3) Equipped with limit protection for any working position as well as overload and overcurrent protection for safety and reliability.
4) Automatic reset function after the experiment, returning to the initial state, making it easy to install and fix the next sample.
5) Heating and shaping insulation system with evenly distributed heating tubes. The circulating fan and multiple air outlets ensure the heating fully covers the testing space, with spiral air outlet arrangement to avoid directly blowing on the sample.
6) Stainless steel inner liner and insulation layer outside the testing space to prevent heat loss and protect personnel from burns.
7) The top cover has a tempered glass observation window, allowing you to watch the experiment and sample state. A high-definition camera is included for remote observation of stretching.
8) Equipped with a computer control system, building a powerful test database. Experiment data can be saved, queried, and called anytime, with capabilities for data recording and calibration reports.
9) Specialized measurement and control software can perform manual control, automatic control, constant rate force control, constant rate deformation control, and constant speed tension control, among various modes.
10) Users can define stretching modes according to need, such as 1*1 to A*A or A*B. The two power axes stretch according to internally defined speed relations. During stretching, you can hold displacement to observe force decay, or hold force to observe displacement extension, as well as monitor temperature effects on stretching.
11) Clamping tooling is pneumatic with multi-head synchronization. All pipelines use high-temperature resistant products, ensuring no air leaks or pressure loss during long-term operation.
ISO 527-1 Plastics — Determination of tensile properties Part 1: General principles
ISO 527-3 Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets
ISO 17555 Biaxially oriented polypropylene (BOPP) film for general purposes
ISO 15987 Plastics - Film and sheeting - Biaxially oriented polyamide (nylon) films
ISO 15988 Plastics - Film and sheeting - Biaxially oriented poly(ethylene terephthalate) (PET) films
GB/T 10005 Biaxially oriented polypropylene (BOPP) and low-density polyethylene (LDPE) composite films and bags
GB/T 18006.1-2009 General technical requirements for disposable plastic tableware
ISO 7500-1:2018 Metallic materials — Calibration and verification of static uniaxial testing machines
Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system
High and low temperature environmental chamber (-70~180℃): tests high-temperature tensile stretching and low-temperature toughness, suitable for film heat shrinkage and thermoforming conditions;
High-definition in-situ camera system: records the entire process of film stretching, necking, delamination, and tearing;
Pneumatic inflation attachment: simulates the biaxial stretching forces in blown film composite.
Specimen Clamping: The cross-shaped polymer film is placed in the center, with each of the four arms fixed to the X/Y clamps, and auto-aligned.
Control Mode Selection:
Equal Biaxial (1:1): X and Y stretch at the same speed simultaneously, ensuring uniform stress and strain, mimicking the orientation process of biaxially stretched film production.
Unequal Biaxial: Customize the X/Y stretching speed or force ratio to detect differences in film mechanics (anisotropy).
Synchronous Acquisition: Two-axis force sensors and optical extensometers record load, displacement, and strain in real-time simultaneously.
Data Termination: When the film breaks in any direction, the machine stops automatically, and the software automatically calculates biaxial mechanical properties and generates a standard report.
BOPP biaxially oriented polypropylene film (according to GB/T 10003, ISO 17555);
BOPA biaxially oriented nylon polyamide film (according to ISO 15987, GB/T 20218);
BOPET biaxially oriented polyester film (ISO 15988, GB/T 16958);
PE, PVC, PS cast films, lithium battery separators, optical release films, flexible packaging composite films;
Elastic films, geotextile membranes, medical polymer films, thermoforming sheets.
Quality inspection for thin film manufacturers: Testing the machine properties of BOPP, BOPA, BOPET films in both MD and TD directions to meet national or export ISO standards;
Polymer material R&D: Developing new resins and modified masterbatch formulas, comparing biaxial orientation performance of films under different stretching processes;
Flexible packaging industry: Simulating biaxial pulling of composite films, vacuum bags, and boil-in-bags to evaluate tear resistance and extensibility;
Lithium battery / optical film industry: Testing the biaxial tensile strength and uniformity of diaphragms and release films;
Universities / research institutes: Studying polymer molding mechanisms, plotting biaxial stress-strain curves and yield surfaces.
Main Technical Specification
| Maximum test force | 500N for four axes |
| Test machine accuracy class | 0.5 |
| Test force measurement range | 0.2%—100% FS |
| Relative error of test force reading | within ±0.5% of reading |
| Test force resolution | 1/±300000 of maximum test force (full-range resolution constant) |
| Relative error of large deformation reading | within ±0.5% of reading |
| Large deformation resolution | 0.008mm |
| Relative error of displacement reading | within ±0.5% of reading |
| Displacement resolution | 0.001mm |
| Force control rate adjustment range | 0.01-5% FS/s |
| Relative error of force control rate | within ±1% of set value |
| Crossbeam speed adjustment range | 0.01—300mm/s |
| Tensile ratio | 5:1 |
| Effective stretching space (with fixtures) | 350*350mm |
| Drive method | servo motor with screw rail transmission loading |
| Stretching modes | one-way constrained, one-way unconstrained, two-way synchronous, two-way asynchronous |
| Main unit dimensions | 1700×1650×1550 mm |
| Power supply | 380V; 50HZ, 3kW |
| Weight | 30Kg |
| Fixtures: (Stainless steel or aluminum alloy) | |
| Clamping fixture | Manual clamping (automatic fixture optional) |
| Number of fixtures | 4*1 group |
| Fixture width | 15mm |
| Clamping thickness | 0.1-5mm (soft materials) |
| Heating and temperature control (optional) | |
Main Accessories
| Item | Quantity |
| Mainframe and transmission parts | 1 set |
| High-precision ball screws (TBI) | 4 sets |
| Reduction system (Taiwan) | 4 sets |
| Servo motors (Japan Panasonic) | 4 sets |
| Load cell (USA Celtron) | 4 pcs |
| SED103 measurement control system | 1 set |
| Clamp-type stretch fixtures | 4*1 set |
| Heating system (optional) | |
| Setting and insulation system (optional) | |
| Infrared temperature measurement system (optional) | |
| Lenovo computer | 1 set |
| HP A4 color inkjet printer | 1 set |
| Professional English Software | 1 set |
| Video monitoring system (optional) | |
| Documents (Manual, packing list, certificate) | |
Standard
ISO 17555 applies to packaging-grade BOPP films containing ≥95% polypropylene resin; usable as single-layer film or laminates paired with other plastic substrates. The test stipulated in ISO 17555 mainly include, tensile strength & strain at break, Dimensional change on heating (thermal shrinkage), Coefficient of water vapour transmission, Haze, Wetting tension etc.,
ISO 15987 specifies classification, mandatory visual, dimensional, mechanical, barrier, optical, surface energy, and food contact safety requirements for transparent BOPA film, supplied in roll form, either used standalone or laminated with PE, CPP, PET, aluminium foil for multi-layer packaging structures. The test stipulated in ISO 15987 mainly include, tensile strength & tensile strain at break, Oxygen transmission coefficient, Dimensional change on heating, Haze, Wetting tension etc.,
ISO 15988 specifies requirements for biaxially oriented transparent PET (BOPET) films, mainly used for packaging, either alone or as a laminated layer with other films. The main test stipualted in this standard include tensile strength and strain, Dimensional change on heating, Oxygen transmission coefficient, Water vapour transmission coefficient, Haze, Wetting tension, thickness etc.,
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