Off-line thickness measurement, performed outside of the production line, provides an efficient and precise way to assess material quality. This article explores the importance, methods, and tools used for off-line thickness measurement of PE films and aluminum foil sheets.

Why Thickness Measurement Matters

1. Quality Assurance
   Maintaining consistent thickness ensures uniform product performance and minimizes defects. Variations in thickness can lead to weak spots, inefficiencies, or compromised barrier properties in packaging.
2. Cost Efficiency
   Excessive material thickness increases production costs, while insufficient thickness may compromise functionality. Accurate measurement helps balance cost and performance.
3. Compliance with Standards
   Industries often have strict standards for material thickness. For example, food and pharmaceutical packaging must meet stringent requirements to ensure safety and durability.
4. Performance Optimization
   Thickness directly affects mechanical properties like tensile strength, flexibility, and barrier performance. Regular measurement ensures the material meets the desired specifications.

Methods of Off-line Thickness Measurement

Various techniques are used to measure the thickness of PE films and aluminum foils off-line. Each method has its strengths, depending on the material’s properties and the precision required.

1. Mechanical Contact Measurement

This traditional method uses micrometers or calipers to measure thickness by applying direct contact to the material.

• Advantages:
  • Simple and cost-effective.
  • Provides accurate point measurements.
• Limitations:
  • Labor-intensive and slow.
  • Potential to deform soft materials like thin PE films.

2. Magnetic Induction Measurement

For aluminum foil, which is conductive, magnetic induction techniques are often used. These devices measure the distance between the probe and a metallic reference.

• Advantages:
  • High precision for metallic materials.
  • Non-destructive.
• Limitations:
  • Limited to conductive materials like aluminum foil.

3. Infrared (IR) or Optical Thickness Gauging

Optical methods involve shining infrared light onto the material and measuring its absorption or reflection to calculate thickness.

• Advantages:
  • Ideal for transparent and semi-transparent PE films.
  • Non-contact and non-destructive.
• Limitations:
  • Less effective for opaque or highly reflective materials.

4. Ultrasonic Measurement

Ultrasonic devices send sound waves through the material and measure the time it takes for the wave to return, calculating thickness based on the speed of sound in the material.

• Advantages:
  • Suitable for both PE films and aluminum foil.
  • Non-destructive and highly accurate.
• Limitations:
  • Requires calibration for different materials.

Labthink Solutions for Off-line Thickness Measurement

Labthink offers advanced instruments for measuring the thickness of flexible packaging materials, including PE films and aluminum foils. These devices provide highly accurate and repeatable measurements, making them ideal for quality control labs.

Labthink C640 Thickness Tester

• Features:
  • Mechanical contact method with high precision.
  • Suitable for PE films, aluminum foils, and other thin materials.
  • Conforms to standards like ASTM D645 and ISO 4593.
• Applications:
  • Ideal for laboratory testing of flexible films and foils.
  • Easy to operate with automated testing functions.

1, magnetic card thickness detection

According to ISO 7810, the international standard of magnetic card on the physical performance of the magnetic card, the thickness of the magnetic card should be 0.76±0.08mm. Therefore, the thickness detection of magnetic card is to detect and control the thickness of magnetic card. On the other hand, it can save the raw material input and increase the output value. Take Labthink C640 Thickness Tester as an example, the thickness tester adopts the principle of mechanical surface contact type measurement, and the resolution is up to 0.1 micron. In addition, the operation of the instrument is very simple. Due to the automatic feeding function, it only needs to set the measurement points, sample step distance/interval, test time and other parameters before the test, and click the Test to start the test. Labthink is continuous innovating, researching and developing while accumulating technologies, the tester uses ultra-high precision displacement sensor, scientific structure layout and professional control technology to achieve high test stability, repeatability and precision.

2, magnetic card film stripping testing

In the use of magnetic card, the magnetic card will be subject to the action of many external factors leading to the separation of the surface coating from the substrate. Although it does not affect the use of magnetic card, it will destroy the touch of consumers, reduce the use of feelings. In order to extend the close binding state of the film and the substrate and delay the separation time, in the production process, it is necessary to test magnetic card sample, including testing the stripping strength of the film and the substrate in advance, that is, the film will be separated from the substrate under much force, so as to improve the filming process. Labthink BLD-200N Stripping Tester have for models with different load ranges according to the customer’s detection requirements, i.e., 30N/50N/100N/200N, with an accuracy of level 1 and a minimum detectable tension of 0.06N. The instrument is controlled by a microcomputer, and has two major functions of stripping and stretching. The specific detection method is very simple: first of all, sample the magnetic card according to the requirements and peel off part of the film and substrate, and keep both firmly fixed on the fixture. Secondly, set the test parameters according to the standards or the experimental requirements. Finally, click on the start button to start the test. The whole test process will be completed automatically by the system control, and the test results are printed by the built-in microprinter.

The above several magnetic card detection items, in the actual production, are vital to adjust the production process and improve the product quality. Through the corresponding test instruments, to control and master a reasonable variety of technical parameters, the materials can be well used in the production of magnetic cards while control quality and control costs. Labthink is committed to helping customers deal with packaging problems through the improvement of packaging testing technology and the research and development of testing instruments, and helping the quality and safety of packaging related industries. For more details, please Click to Labthink or email to info@labthink.com for consultation. Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.

A benchtop thickness tester for thin materials is a specialized instrument used to accurately measure the thickness of thin materials such as films, foils, papers, textiles, and other similar products. These thickness testers are designed to provide precise measurements of material thickness, often in microns or mils.

The benchtop thickness tester typically consists of a base unit with a flat surface where the material sample is placed for measurement. The instrument applies a constant pressure on the sample while a sensor detects the thickness of the material. The results are displayed on a digital screen for easy reading and analysis.

These testers are commonly used in industries like packaging, manufacturing, quality control, and research and development where knowing the exact thickness of thin materials is critical for ensuring product quality and performance.

Labthink® Benchtop Film Thickness tester

This thickness tester is applicable to the determination of thickness of:

Professional

CHY-CB Thickness Tester is designed based on the mechanical contacting method, which effectively ensures standard and accurate test data. The instrument strictly conforms to multiple national and international standards.

High-end

This thickness tester utilizes Labthink’s latest embedded computer control system, which provides a better performance than traditional single chip system.

Intelligent

The thickness tester is equipped with Labthink’s latest intelligent operating software, with user-friendly operating interface and intelligent data management. It also supports Lystem™ Lab Data Sharing System, which ensures uniform management of test results and test reports.

Thickness of BOPP cigarette film is the basic film performance index. Uneven thickness would influence the tensile strength and permeability as well as the following procedures. Thicker cigarette film would have better stiffness with better visual performance. But, the cost would also be great. In order to find the balanced solution, high precision thickness tester is needed. Labthink PARAM CHY-C2 is the lab thickness tester with the precision up to 0.1um. When testing thickness in different directions, deviation must be controlled within 3% usually. Meanwhile, the edge thickness of BOPP film has to be measured.

Further details please feel free to contact Amanda via:
TEL: +8653185060139     
FAX: +8653185062108                                              
EMAIL: trade5@labthink.cn       
MSN: amanda_labthink@hotmail.com

Further details please feel free to contact Amanda via:
TEL: +8653185060139     
FAX: +8653185062108                                              
EMAIL: trade5@labthink.cn       
MSN: amanda_labthink@hotmail.com

These testers adopt world leading technologies to ensure high accuracy and good repeatability with its convenient and simple operation. They have greatly reduced human interferences on the results. The testing results analysis and printing as well as contact area, measure pressure and moving speed are in strict compliance with standards.

These testers consist of 3 parts, namely, control system, measurement system and output/printing system. Measurement system measures film thickness and outputs corresponding electronic signal; control system is for parameter setting, correcting, signal processing and result display; and output/printing system is for result output and printing.

Labthink, the excellent provider of testing instruments and testing services, is devoted to provide most excellent and complete quality control solutions for pharmaceutical, foodstuff, cosmetics, packaging, printing, adhesive, automotive, petrochemistry, environment, biology, new energy, construction, aviation and electronic industries worldwide.

Further details please feel free to contact Amanda via:
TEL: +8653185060139     
FAX: +8653185062108                                              
EMAIL: trade5@labthink.cn       
MSN: amanda_labthink@hotmail.com

The principle of volatile corrosion inhibition is by using VCI, volatile corrosion inhibitor which can be evaporated under normal temperature so as to achieve saturation in the closed environment; VCI molecules are absorbed onto the metal surface to form a transparent protection film of several molecules thick after complicated physical and chemical reactions. This transparent protection layer is water proof, difficult to be dissolved and thus, can stop further corrosion. Evaporated VCI molecules can reach anywhere in the package with best anti-rust performance. VCI plastic material is manufactured by polyolefin resin with VCI under processes.

Volatile corrosion inhibiting film testing should adopt US military specification MII.PRF-22019D “Barrier Materials, Transparent, Flexible, Sealable, Volatile Corrosion Inhibitor Treated” and other domestic and international standards.

Whether the thickness of VCI plastic film is even or not is the basic for VCI film and its performances. Uneven thickness would affect the tensile strength, permeation of different parts of the package; and would affect the following processing. Thickness testing methods are varied. For VCI plastic film thickness measurement, ISO 4593 and GB/T 6672-2001 are applicable.

Labthink PARAM CHY-C2 and CHY-CA Thickness Testers are both high precision thickness testers for VCI plastic film thickness testing with the resolution upto 0.1um. Labthink PARAM CHY-CA Thickness Tester, besides its high precision, high efficiency and other characteristics and functions to similar PARAM CHY-C2, is equipped with automatic feeding system to satisfy the constant and effective testing requirements of the clients with greater testing efficiency.

Labthink, the excellent provider of testing instruments and testing services, is devoted to provide most excellent and complete quality control solutions for pharmaceutical, foodstuff, cosmetics, packaging, printing, adhesive, automotive, petrochemistry, environment, biology, new energy, construction, aviation and electronic industries worldwide.

Further details please feel free to contact Amanda via:
TEL: +8653185060139     
FAX: +8653185062108                                              
EMAIL: trade5@labthink.cn       
MSN: amanda_labthink@hotmail.com

Monocrystal line silicon wafer thickness testers consist of control, measurement and output systems. Measurement system measures thickness of silicon wafer and outputs corresponding electronic signal; control system is for parameter setting, modification, signal transfer and results display; output system calculates and prints the testing results.

These testers apply the most advanced measurement achievements, and are fully guaranteed with high accuracy and high result similarity. They are easy to operate and reduce human interferences to the utmost. Contact area, pressure, speed and other items comply with relevant standards. For a single test, measurement results can be typed; for several measurements, statistical results and their analysis can be printed.

Labthink, the excellent provider of testing instruments and testing services, is devoted to provide most excellent and complete quality control solutions for pharmaceutical, foodstuff, cosmetics, packaging, printing, adhesive, automotive, petrochemistry, environment, biology, new energy, construction, aviation and electronic industries worldwide.

Further details please feel free to contact Amanda via:
TEL: +8653185060139     
FAX: +8653185062108                                              
EMAIL: trade5@labthink.cn       
MSN: amanda_labthink@hotmail.com