PET Composite Non-Woven Tape for Electrical Insulation
2026-09-29
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What Is PET Composite Non-Woven Tape?
PET composite non-woven tape is an electrical insulation tape made by combining a polyester (PET) film layer with a non-woven insulating layer, together with a suitable adhesive system when an adhesive-backed construction is required.
The composite structure combines the dimensional stability and dielectric properties of PET film with the flexibility and conformability of non-woven material.
This makes PET composite non-woven tape useful for electrical insulation applications where a single film layer may not provide the required combination of flexibility, mechanical protection, and insulation performance.
Structure of PET Composite Non-Woven Tape
A typical construction may include:
PET Film + Non-Woven Insulation Layer + Adhesive
Depending on the application, the material structure and adhesive can be customized.
The PET layer can provide:
Electrical insulation
Dimensional stability
Mechanical strength
Smooth and consistent surface
The non-woven layer can provide:
Flexibility
Conformability
Cushioning
Additional insulation thickness
The final performance depends on the materials, thickness, adhesive system, and manufacturing process.
Where Is PET Composite Non-Woven Tape Used?
PET composite non-woven tape can be used in various electrical insulation applications.
1. Transformer Insulation
The tape can be used for winding insulation, layer separation, component wrapping, and other insulation positions where a composite structure is required.
Transformer insulation systems may use different materials according to the specific electrical, thermal, and mechanical requirements of each position.
2. Motor and Coil Insulation
PET composite non-woven tape can also be considered for motor and coil applications where flexibility and insulation stability are important.
It can be used for:
Coil wrapping
Winding insulation
Component fixing
Protective insulation
Separation between insulating components
3. Electrical Components
The composite structure can also be used in various electrical and electronic components where additional insulation thickness or conformability is required.
PET Composite Non-Woven Tape vs PET Film Tape
Although both products use PET film, their structures and application characteristics are different.
Feature
PET Film Tape
PET Composite Non-Woven Tape
Structure
PET film + adhesive
PET + non-woven + adhesive
Flexibility
Good
Generally higher
Surface
Smooth
Composite structure
Dimensional stability
High
High, depending on construction
Cushioning
Limited
Better
Thickness options
Thin to medium
Medium and higher constructions
Typical use
General electrical insulation
Composite insulation and wrapping
The right choice depends on the insulation position and required tape construction rather than simply the material name.
How to Choose PET Composite Non-Woven Tape
Before selecting a product, several parameters should be confirmed.
Thickness
Thickness affects insulation build-up, mechanical protection, and the available space inside the component.
Width
The tape width should match the winding or assembly process. Narrow tapes may be required for automatic or precision applications.
Adhesive
The adhesive system should be compatible with the application temperature and the surface being bonded.
Electrical Performance
Depending on the insulation system, buyers may need to evaluate dielectric strength, insulation resistance, and other electrical properties.
Temperature Resistance
The complete tape construction should be evaluated under the actual operating and processing temperature.
Winding and Converting Quality
For automatic applications, consistent slitting, stable rewinding, edge quality, and winding density are also important.
Why Manufacturing Quality Matters
For composite insulation tapes, the performance of the finished product depends not only on the raw materials but also on the converting process.
Important manufacturing controls include:
Composite material quality
Adhesive coating uniformity
Drying and curing
Rewinding tension
Slitting accuracy
Roll winding density
Finished-product inspection
Poor converting quality can cause problems such as uneven edges, unstable rolls, wrinkles, or inconsistent tape feeding.
Customized PET Composite Non-Woven Tape
Different electrical components may require different combinations of:
PET film thickness
Non-woven thickness
Total thickness
Adhesive type
Adhesive thickness
Tape width
Roll length
Core size
Color
Therefore, customized PET composite non-woven tape can be developed according to the customer's insulation structure and production process.
Liangyi Tape — Electrical Insulation Tape Manufacturer
Changshu Liangyi Tape Industrial Co., Ltd. is a source manufacturer of electrical insulation tapes with in-house coating, rewinding, and slitting capabilities.
Our product range includes:
PET / Mylar insulation tape
PI / Kapton tape
PET composite non-woven tape
PET silicone tape
Fiberglass cloth insulation tape
Transformer barrier tape
Transformer margin tape
We can provide customized widths, thicknesses, adhesive systems, and roll specifications for transformer, motor, coil, and other electrical insulation applications.
Conclusion
PET composite non-woven tape combines the advantages of PET film and non-woven insulation materials in one composite construction.
It can be considered when an electrical insulation application requires a combination of insulation, flexibility, mechanical stability, and conformability.
When selecting the right tape, evaluate the complete construction, adhesive system, thickness, electrical performance, temperature requirements, and converting quality rather than choosing only by the backing material.
Looking for customized PET composite non-woven tape for electrical insulation? Contact Liangyi Tape for your application requirements.
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Why Tape Flatness Matters in Automatic Tape Application
2026-09-28
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Electrical insulation tape is often used in automatic winding and taping processes for transformers, coils, motors, and other electrical components.
For these applications, electrical insulation performance is not the only consideration. Tape flatness, winding density, roll stability, and slitting quality can also directly affect the performance of automatic equipment.
A tape that looks acceptable during manual application may still cause problems on an automatic winding machine if the finished roll is not sufficiently flat and stable.
What Is Tape Flatness?
Tape flatness refers to the ability of a finished tape roll or tape web to remain relatively flat and stable without excessive curling, deformation, edge lifting, or uneven winding.
For automatic applications, good tape flatness helps the tape:
Feed smoothly through the machine
Maintain a stable running direction
Pass through guide rollers correctly
Maintain consistent contact with the application surface
Reduce wrinkles and edge deformation
Prevent unexpected interference with machine components
This is particularly important for narrow insulation tapes used at high winding speeds.
Why Is Flatness Important for Automatic Winding Machines?
Automatic winding machines typically use rollers, guides, tension systems, and other mechanisms to control the movement of insulation tape. Research on insulation-tape winding systems also highlights the importance of controlling tape tension during automatic winding.
If the tape roll has poor winding quality, several problems may occur.
1. Tape Deformation
If the finished roll is uneven or has excessive internal stress, the tape may deform when unwound.
This can cause:
Edge lifting
Tape curling
Wrinkles
Uneven feeding
Unstable positioning
2. Unstable Tape Feeding
Automatic equipment requires relatively consistent tape movement.
A deformed tape roll may cause the tape to move from side to side or fail to remain properly aligned with the guide system.
This can affect the final winding position.
3. Interference With Machine Rollers
For some automatic winding applications, the tape needs to pass through multiple rollers.
If the tape roll contains loose areas, protrusions, or unevenly wound sections, the tape may not enter the roller system smoothly.
In severe cases, the tape can become trapped between rollers and interrupt production.
4. Reduced Winding Consistency
Uneven winding density can create differences in roll diameter and local tension.
During automatic application, this may result in inconsistent tape feeding and different winding tension from one section of the roll to another.
What Causes Poor Tape Flatness?
Tape flatness is influenced by several manufacturing factors.
Factor
Possible Effect
Rewinding tension
Excessive or insufficient tension may cause deformation
Winding density
Loose winding can create gaps and unstable roll structure
Slitting quality
Uneven edges can affect tape tracking
Core alignment
Misalignment can cause an uneven roll
Film properties
Flexible films may be more sensitive to winding conditions
Adhesive properties
Adhesive thickness and tack can affect winding behavior
Roll handling
Improper storage or transportation may deform finished rolls
Therefore, tape flatness should be considered together with rewinding and slitting quality, rather than treated as an isolated appearance requirement.
Why Winding Density Matters
A well-controlled rewinding process should produce a compact and uniform roll.
If the winding density is too low, gaps may form between tape layers. These gaps can become more obvious during transportation, storage, or automatic unwinding.
For narrow tapes used on automatic equipment, loose winding may create local protrusions or unstable sections.
A sufficiently dense and uniform roll provides better dimensional stability and more consistent tape feeding.
The Relationship Between Rewinding Tension and Flatness
Rewinding tension needs to be carefully controlled.
If the tension is too high, the tape may experience excessive stress, edge deformation, or roll distortion.
If the tension is too low, the winding may become loose and unstable.
Therefore, the objective is not simply to use higher winding tension, but to establish a suitable tension range according to the tape structure, width, thickness, adhesive system, and application requirements.
This is especially important for PET/Mylar insulation tapes and other thin electrical insulation materials.
How Can Manufacturers Improve Tape Flatness?
A reliable manufacturing process should control several stages:
1. Stable Slitting
The tape should be slit to the required width with consistent edges and minimal deformation.
2. Controlled Rewinding
Rewinding tension should be adjusted according to the tape construction and roll dimensions.
3. Uniform Winding Density
The finished roll should be compact and evenly wound without obvious loose sections or local protrusions.
4. Roll Inspection
Finished rolls can be checked for:
Flatness
Edge condition
Roll appearance
Winding density
Core alignment
Width
Length
Adhesive condition
5. Application Testing
For tapes intended for automatic equipment, testing the tape on the actual application process can provide more useful information than relying only on conventional laboratory tests.
Tape Flatness Is More Than an Appearance Requirement
For general manual applications, minor roll deformation may not always cause an obvious problem.
For automatic tape application, however, the requirements can be much stricter.
A stable tape roll can help improve feeding consistency, reduce machine interruptions, and maintain uniform winding quality.
This is why electrical insulation tape for automatic equipment should be evaluated not only for electrical and adhesive properties, but also for flatness, winding density, rewinding quality, and converting accuracy.
Liangyi Tape: Electrical Insulation Tape for Automatic Applications
Changshu Liangyi Tape Industrial Co., Ltd. manufactures electrical insulation tapes with in-house coating, rewinding, and slitting capabilities.
Our product range includes:
PET / Mylar insulation tape
PI / Kapton tape
PET silicone tape
PET composite non-woven tape
Fiberglass cloth insulation tape
Transformer barrier tape and margin tape
For automatic winding applications, we can customize tape width, thickness, roll length, adhesive system, rewinding structure, and other converting requirements according to the customer's application.
Our focus is not only on the tape material itself, but also on the finished roll quality required by the customer's production process.
Conclusion
For automatic tape application, tape flatness and winding quality can be just as important as basic insulation and adhesive performance.
Proper slitting, rewinding tension, winding density, and finished-roll inspection can help produce a more stable tape roll for automatic winding machines.
When selecting electrical insulation tape for automatic equipment, it is therefore important to evaluate both material performance and converting quality.
Looking for customized electrical insulation tape for automatic winding applications? Contact Liangyi Tape for PET, PI, silicone, composite, and other electrical insulation tape solutions.
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What Is Margin Tape and How Is It Used in Transformers?
2026-09-28
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Margin tape is an electrical insulation material used in transformer winding applications to create a controlled insulating margin between conductive layers and other transformer components.
It is commonly supplied in narrow or customized widths and can be made from different insulating materials depending on the transformer design, insulation system, and manufacturing requirements.
What Is Transformer Margin Tape?
Transformer margin tape is used to provide additional insulation coverage along the edge of a winding or insulating layer.
During transformer manufacturing, maintaining the required insulation distance is important. Margin tape can help create a defined insulating area and reduce the risk of unwanted contact between conductive components.
The exact width, thickness, and material of margin tape depend on the transformer structure and insulation requirements.
Where Is Margin Tape Used?
Margin tape is mainly associated with transformer winding and electrical insulation applications.
Typical applications include:
Transformer winding insulation
Edge insulation
Layer separation
Insulation margin control
Electrical component protection
Customized transformer insulation structures
The tape may be applied manually or incorporated into automated winding and assembly processes.
Common Materials for Margin Tape
PET / Mylar Margin Tape
PET film is commonly used for electrical insulation because it provides a combination of mechanical strength, dimensional stability, and electrical insulation performance.
PET / Mylar margin tape can be supplied in customized widths and thicknesses according to the transformer design.
PI / Kapton Margin Tape
PI tape may be selected when the application requires higher-temperature performance.
The suitability of PI margin tape depends on the complete tape construction, including the polyimide film and adhesive system.
Composite Insulation Tape
Composite structures can combine different insulation materials to meet specific requirements for flexibility, thickness, mechanical performance, or electrical insulation.
The appropriate construction should be selected according to the customer's insulation system.
How to Choose Margin Tape for Transformers?
1. Width
Width is one of the most important specifications for margin tape.
The required width should correspond to the transformer winding design and the required insulation margin.
For customized products, manufacturers can slit wider materials into specific narrow widths.
2. Thickness
The thickness of margin tape affects the overall insulation structure.
Customers should clarify whether the specified thickness refers to:
Film thickness
Adhesive thickness
Total tape thickness
3. Electrical Insulation Performance
Depending on the application, customers may specify requirements such as:
Breakdown voltage
Dielectric strength
Insulation resistance
Insulation thickness
Testing methods should be clearly defined when comparing products from different suppliers.
4. Temperature Requirements
The tape should be compatible with the operating temperature of the transformer and the overall insulation system.
The actual temperature performance depends on the complete construction, including the backing material and adhesive.
5. Application Method
The application method can also influence tape selection.
For automatic winding or dispensing, important factors may include:
Consistent width
Stable roll structure
Suitable winding density
Clean slitting edges
Good roll flatness
Controlled adhesive performance
A tape that works well for manual application may require additional process validation for automatic equipment.
Customized Transformer Margin Tape
Transformer manufacturers may have different requirements for margin tape depending on their winding design.
Typical specifications include:
Material
Total thickness
Width
Roll length
Core size
Adhesive type
Color
Packaging
At Liangyi Tape, we provide customized electrical insulation tape solutions with coating, rewinding, and slitting capabilities.
Our self-produced insulation tape categories include:
PET / Mylar insulation tape
PI / Kapton tape
PET composite non-woven tape
PET silicone tape
Fiberglass cloth tape for electrical insulation applications
Margin Tape Manufacturer in China
Changshu Liangyi Tape Industrial Co., Ltd. is a source manufacturer of industrial electrical insulation tapes in China.
We focus on electrical insulation tape manufacturing and customized converting rather than general packaging tape.
Our capabilities include:
Adhesive Coating → Rewinding → Slitting → Inspection → Packing
Relevant quality and compliance documentation includes UL E246820, ISO 9001, ISO 14001, IATF 16949, REACH, and RoHS-related testing documentation.
Conclusion
Margin tape is an important insulation material for transformer winding applications. By providing a controlled insulating margin, it can help meet the electrical separation requirements of different transformer designs.
When selecting margin tape, customers should consider the required material, width, thickness, electrical performance, temperature requirements, adhesive, and application method.
Looking for transformer margin tape?
Contact Liangyi Tape with your required width, thickness, quantity, and application for a customized electrical insulation tape solution.
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What Is Transformer Barrier Tape? Applications and Selection Guide
2026-09-24
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Transformer barrier tape is an electrical insulation material used to provide separation and insulation between different parts of a transformer. It can help maintain the required insulation distance and protect components during winding and assembly.
Depending on the transformer design and insulation system, barrier tape can be made with different film, non-woven, adhesive, and composite structures.
What Is Transformer Barrier Tape?
Transformer barrier tape is designed to create an insulating barrier between conductive or functional parts of a transformer.
It may be used in areas where controlled insulation thickness, electrical separation, and reliable positioning are required.
The exact construction depends on the transformer's design, operating temperature, electrical requirements, and manufacturing process.
Where Is Barrier Tape Used in Transformers?
Barrier tape can be used in several transformer manufacturing processes, including:
Layer insulation
Winding insulation
Separation between conductive components
Insulation barriers
Component protection
Customized transformer insulation structures
The required tape construction should be determined according to the specific transformer design.
Common Materials for Transformer Barrier Tape
PET / Polyester Barrier Tape
PET film is commonly used for electrical insulation because of its combination of mechanical strength, dimensional stability, and insulation performance.
PET-based barrier tape can be customized according to the required thickness and width.
Composite Barrier Tape
Composite constructions can combine different insulation materials to achieve specific mechanical, electrical, or processing characteristics.
For example, a composite film structure or PET/non-woven construction may be selected for a particular transformer application.
Non-Woven Barrier Tape
Non-woven materials can provide flexibility and conformability while serving as part of an electrical insulation system.
The material and adhesive construction should be selected according to the required insulation and temperature conditions.
How to Choose Transformer Barrier Tape?
Several factors should be considered when selecting barrier tape.
1. Thickness
The total thickness of the tape affects the insulation structure and available space inside the transformer.
Customers should specify whether the required thickness refers to the backing material or the complete tape construction.
2. Width
Barrier tape width should match the transformer design and required insulation area.
For customized products, manufacturers may supply narrow-width rolls according to the customer's winding or assembly process.
3. Electrical Insulation
Depending on the application, important requirements may include:
Breakdown voltage
Dielectric strength
Insulation resistance
Insulation thickness
Test methods and conditions should be confirmed when comparing different suppliers.
4. Temperature Resistance
The tape should be compatible with the operating temperature and insulation system of the transformer.
Temperature performance depends on the complete construction, including the backing material and adhesive.
5. Adhesive Performance
If the barrier tape uses an adhesive layer, the adhesive should be compatible with the target substrate and operating conditions.
Tack, peel strength, aging performance, and temperature resistance may need to be evaluated.
Customized Transformer Barrier Tape
Transformer manufacturers may require specific combinations of:
Material
Thickness
Width
Adhesive
Roll length
Core size
Winding configuration
At Liangyi Tape, we provide customized electrical insulation tape solutions with coating, rewinding, and slitting capabilities.
Our self-produced insulation tape categories include:
PET / Mylar insulation tape
PI / Kapton tape
PET composite non-woven tape
PET silicone tape
Fiberglass cloth tape for electrical insulation applications
We can work with customers on customized tape dimensions and constructions according to their application requirements.
Transformer Barrier Tape Manufacturer in China
Changshu Liangyi Tape Industrial Co., Ltd. is a source manufacturer of industrial electrical insulation tapes in China.
Our focus is on electrical insulation products rather than general carton sealing tape. We provide customized converting and manufacturing solutions for industrial customers.
Relevant quality and compliance documentation includes UL E246820, ISO 9001, ISO 14001, IATF 16949, REACH, and RoHS-related testing documentation.
Conclusion
Transformer barrier tape provides an insulating barrier and separation function in transformer manufacturing. PET, composite film, and non-woven constructions can be selected for different applications depending on electrical, thermal, mechanical, and processing requirements.
When sourcing barrier tape, customers should clearly define the required material, total thickness, width, adhesive, electrical performance, and application conditions.
Looking for customized transformer barrier tape?
Contact Liangyi Tape with your required material, thickness, width, quantity, and application for a customized electrical insulation tape solution.
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PET Tape vs PI Tape: What Is the Difference?
2026-09-22
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PET Tape vs PI Tape: What Is the Difference?
PET tape and PI tape are two commonly used materials in electrical insulation and industrial manufacturing. Although both can provide electrical insulation and protection, they differ in backing material, temperature performance, and application suitability.
Understanding the differences between PET and PI tape helps engineers and purchasing teams select the right insulation tape for their products.
1. What Are PET Tape and PI Tape?
PET Tape (Polyester Insulation Tape)
PET tape uses polyethylene terephthalate (PET) polyester film as its backing material. It offers a combination of electrical insulation, mechanical strength, and dimensional stability.
PET tape is commonly used in electrical components, transformer insulation, motor manufacturing, and industrial assembly.
PI Tape (Polyimide / Kapton Tape)
PI tape uses polyimide film as its backing material. It is widely selected for applications that require high-temperature performance and reliable electrical insulation.
PI tape is often used in electronics, motor insulation, high-temperature processing, and specialized electrical applications.
2. PET Tape vs PI Tape: Key Differences
Property
PET Tape
PI Tape
Backing material
Polyester (PET)
Polyimide (PI)
Temperature performance
Depends on grade and adhesive
Often selected for higher-temperature applications
Electrical insulation
Available in different grades
Available in different grades
Common applications
Transformers, motors, components
Electronics, motors, high-temperature insulation
Cost considerations
Often a cost-effective option
May have a higher material cost
Adhesive options
Acrylic, rubber-based, and other systems
Acrylic, silicone, and other systems
Note: Actual performance depends on the tape construction, adhesive, thickness, and test conditions.
3. Temperature Resistance
Temperature resistance is one of the main factors that distinguishes PET tape from PI tape.
PET tape can be suitable for applications with moderate temperature requirements, depending on its film and adhesive specifications.
PI tape is frequently selected for applications requiring higher-temperature resistance. However, the temperature rating of the complete tape depends on both the polyimide film and adhesive.
Before choosing a tape, customers should confirm:
Operating temperature
Exposure duration
Adhesive temperature resistance
Required electrical insulation performance
A material's general temperature characteristics should not replace verification of the specific product's technical data.
4. Common Applications
PET Insulation Tape
PET tape is commonly used in:
Transformer insulation
Motor and electrical component manufacturing
Insulation wrapping
Electrical separation
Industrial assembly
It is a practical option when the application requires suitable electrical insulation, mechanical performance, and controlled cost.
PI / Kapton Tape
PI tape is commonly used in:
High-temperature electrical insulation
Electronic component manufacturing
Motor and coil insulation
Specialized industrial applications
Thermal processing environments
The appropriate grade depends on the required temperature, dielectric properties, adhesive performance, and application conditions.
5. How to Choose Between PET and PI Tape?
Consider the following factors when selecting electrical insulation tape:
1. Temperature Requirements: Determine the normal and maximum operating temperatures.
2. Electrical Performance: Confirm breakdown voltage, dielectric strength, and other required specifications.
3. Adhesive Compatibility: Check adhesion to the target substrate and performance under operating conditions.
4. Thickness and Width: Select dimensions that meet the product design and application process.
5. Cost and Manufacturing Requirements: Consider the balance between material performance, production efficiency, and total cost.
For automatic application, roll stability, width consistency, and rewinding quality should also be evaluated.
6. PET and PI Insulation Tape Manufacturer
Changshu Liangyi Tape Industrial Co., Ltd. is a source manufacturer of industrial adhesive tapes in China. We provide electrical insulation tape solutions with capabilities including adhesive coating, rewinding, and slitting.
Our self-produced product categories include:
PET / Mylar insulation tape
PI / Kapton tape
PET composite non-woven tape
PET silicone tape
Fiberglass cloth tape for electrical insulation applications
We support customized specifications such as tape width, thickness, and roll configuration, depending on product requirements.
Conclusion
PET tape and PI tape serve different electrical insulation requirements. PET tape can be suitable for various general industrial insulation applications, while PI tape is often selected for environments requiring higher-temperature performance.
The best choice depends on the application, temperature, electrical specifications, adhesive compatibility, and manufacturing process.
Looking for PET or PI insulation tape?
Contact Liangyi Tape for customized electrical insulation tape solutions. Share your required thickness, width, quantity, and application with our team to discuss a suitable product.
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