MGK, CCK, and SCK are all types of release papers used in various industries. Here are the differences between them:

MGK (Machine-Glazed Kraft): MGK release paper is made from machine-glazed Kraft paper. It has a smooth and glossy surface on one side, which provides good release properties. It is commonly used in applications such as adhesive tapes, labels, and decals.

CCK (Clay-Coated Kraft): CCK release paper is made from Kraft paper coated with a layer of clay on one side. The clay coating provides enhanced smoothness and improved release properties. CCK release paper is often used in applications that require high-quality printing, such as pressure-sensitive labels, graphic arts, and packaging.

SCK (Super-Calendered Kraft): SCK release paper is made from Kraft paper that has been super-calendered to achieve a very smooth surface. This type of release paper offers excellent release properties and is commonly used in applications such as silicone release liners, composites, and synthetic leather.

In summary, the main differences between MGk, ccK, and sck release papers lie in their manufacturing processes, surface characteristics, and specific applications. MGk paper is machine-glazed kraft paper, ccK paper is clay-coated kraft paper, and sck paper is super-calendered kraft paper. 

While Xinfei Release paper is not belong to CCK release paper ,MGK release paper or SCK release paper. The base paper we use is similar to Glassine's base paper, two coatings on paper surface. First primar PVA coating, then solvent free silicone oil coating. Safe and no chemical residues. Widely used in hygiene industry, like sanitary napkin or sanitary pads.

When it comes to choosing the perfect protective case for your product, the options can be hard to choose from.  At Yisi Packing, we specialize in manufacturing custom EVA cases, cut and sew cases, and lamination cases.  Each style has its unique strengths, and selecting the right one depends on your product, budget, industry, and brand goals.

In this comprehensive guide, we’ll explore the differences between EVA, cut and sew, and lamination cases.  Whether you're a startup launching a new device, a cosmetics brand looking for stylish packaging, or a medical company that needs robust protection, this blog will help you make an informed decision.

1. What Are EVA Cases?

EVA (Ethylene Vinyl Acetate) is a high density foam material widely used for semi rigid protective cases.  These cases are made by thermoforming EVA sheets, which are then laminated with fabrics like PU, nylon, or polyester and finished with a zipper and handle.

Key Features:

• Lightweight yet durable

• Water resistant and shock absorbent

• Customizable shapes and colors

• Ideal for electronics, tools, cosmetics, and medical kits

Manufacturing Process:

• Mold design based on your product
• Thermoforming EVA shell
• Fabrc lamination
• Assembly with zippers, handles, and internal trays

Use Cases:

• Headphone and speaker cases

• Medical device kits

• Tool cases

• Gaming accessories

2. What Are Cut and Sew Cases?

Cut and sew cases are made by stitching multiple pieces of fabric together over soft padding or foam.  Unlike molded EVA cases, these are soft sided and more flexible, offering a unique feel and design.

Key Features:

• More fabric variety (canvas, denim, mesh)

• Greater design freedom for shapes and pockets

• Softer, more textured finish

• Often includes extra compartments and internal dividers

Manufacturing Process:

• Fabric and padding selection

• Pattern cutting

• Sewing and stitching of panels

• Zipper and accessory attachment

Use Cases:

• Cosmetic and toiletry bags

• Travel pouches and organizers

• Wearable tech cases

• Children’s products

3. What Are Lamination Cases?

Lamination cases combine thermoforming and layering technologies, creating a case with a laminated surface over a structured paper or plastic base.  This approach allows for sleek finishes and eye catching branding, making them a popular option for premium packaging.

Key Features:

• Glossy or matte surface textures

• More premium and high end look

• Great for printing graphics and logos

• Semi rigid like EVA but more design focused

Manufacturing Process:

• Base paper or plastic shaping

• Lamination of printed or decorative fabrics

• Assembly with zippers and linings

Use Cases:

• High end electronics packaging

• Brand gift sets

• Medical and wellness kits

• Marketing or promotional cases

4. Head to Head Comparison

5. How to Choose the Right Style for Your Product

✅ Choose EVA Case if:

• You need solid protection with lightweight material

• Your product requires a custom molded fit

• You want a sleek, professional look

✅ Choose Cut and Sew Case if:

• Your case needs lots of compartments or zippers

• You’re working with soft goods or fabric oriented products

• You want the lowest cost at low volumes

✅ Choose Lamination Case if:

• You want a luxury feel and visual impact

• Your packaging is part of a premium product experience

• You plan to print logos or full color designs

6. Why Work with Yisi Packing?

Yisi Packing is a leading EVA case and soft packaging manufacturer based in China. We support global brands with:

• In house mold and design development

• High volume production capabilities

• Custom materials, colors, and finishes

• Strict quality control and ISO certification

Clients trust us for our consistency, innovation, and competitive pricing.

If you're still unsure which type of case is right for your product, our team of engineers and designers is ready to help you.  We offer free consultations, samples, and design support tailored to your business.

7. Ready to Start Your Custom Case Project?

Contact Yisi Packing today to request a quote or sample. Whether you’re developing a new product or upgrading your current packaging, we’ll guide you every step of the way.

👉 Website: www.packingyisi.com
📧 Email: info@packingyisi.com
📞 Phone: +852-57402289

Bonus Tip: Optimize for Your Industry

Each case type can be fine tuned to serve your niche:

• EVA for medical kits with antimicrobial lining

• Cut and sew for travel with hanging hooks and organizers

• Lamination for cosmetics with mirror inserts and printed branding

Yisi Packing will help you turn these ideas into reality.

Introduction

In modern fuel-powered vehicles, the electrical system plays a crucial role, and the wiring harness is the "blood vessels" and "nerves" of the entire electrical system. It is responsible for transmitting power, signals and data to ensure the normal operation of various components such as the engine, lights, instruments and safety systems. So, what exactly are the wiring harnesses in a fuel-powered car? What are their respective functions?

 1. What is an automotive wiring harness?

A Wiring Harness for automobiles is an integrated system composed of multiple wires, cables, connectors, terminals, protective sleeves (such as tapes, bellows), etc. It is designed and assembled in accordance with the electrical layout of the vehicle to ensure that power, signals and data can be transmitted efficiently and stably.

Due to the complex internal environment of automobiles (high temperature, vibration, humidity, etc.), the wiring harness must meet the following requirements:

• High-temperature resistant (The engine compartment can reach over 120℃)
• Anti-vibration (preventing fracture caused by long-term vibration)
• Waterproof and dustproof (especially in the chassis and engine compartment)
• Electromagnetic shielding (to avoid signal interference

2. Classification of main wiring harnesses in fuel vehicles

The wiring harnesses of fuel vehicles are usually classified by functional areas and mainly include the following categories:

(1)Engine Harness

Function: Connect the engine control unit (ECU), sensors, actuators (such as fuel injectors, ignition coils), etc., to ensure the stable operation of the engine.

Main components:

• ECU wiring harness: Transmits engine control signals (such as fuel injection, ignition timing).
• Sensor wiring harness: Connects oxygen sensors, crankshaft position sensors, knock sensors, etc., providing real-time data.
• Actuator wiring harness: Controls fuel injectors, throttle valves, idle motors, etc.

Features: High-temperature resistant, oil-resistant, and usually made of high-specification insulating materials.

(2) Body Wire Harness in car

Function: Connect electrical devices inside the vehicle, such as lights, air conditioners, audio systems, power Windows, etc.

Main components:

• Lighting system wiring harness: connects headlights, taillights, turn signals, brake lights, etc.
• Air conditioning wiring harness: Controls compressors, blowers, and temperature sensors.
• Audio/entertainment system wiring harness: connects radios, speakers, and navigation systems.
• Electric window/door lock wiring harness: Controls window lifting and central locking.

Features: Complex wiring, requiring consideration of waterproofing (such as door wiring harnesses) and anti-interference (such as audio signal lines).

(3) Dashboard Wire Harness

Function: Connect to the dashboard, center console, airbags, etc.

Main components:

• Combined instrument wiring harness: Transmits information such as vehicle speed, rotational speed, fuel level, and water temperature.
• Airbag wiring harness: Connects the airbag sensor and the detonation device (high reliability required).
• Multimedia/navigation wiring harness: Supports display screens, reversing cameras, etc.

 Features: It is necessary to ensure stable signals and prevent false alarms (such as incorrect triggering of airbags).

(4) Chassis Wire Harness

Function: Connect components related to the chassis, such as ABS, ESP, suspension system, etc.

Main components:

• ABS/ESP wiring harness: Connects wheel speed sensors and hydraulic control units.
• Transmission wiring harness (for automatic transmission models) : Transmits shift signals.
• Suspension system wiring harness (for some high-end vehicles) : Connects the air suspension control module.

 Features: It needs to be wear-resistant and corrosion-resistant (the chassis is vulnerable to mud and water erosion).

(5) Trunk Wire Harness

Function: Connect the trunk lights, reversing radar, fuel pump, etc.

Main components:

• Fuel pump wiring harness: Supplies power to the fuel pump (directly affecting the fuel supply to the engine).
• Reversing radar/camera wiring harness: Supports reversing assistance system.
• Trunk light wiring harness: Provides lighting.

Features: Waterproof required (water may enter the trunk).

(6) CAN bus (Controller Area Network)

Function: Modern automobiles use CAN bus to replace some traditional wiring harnesses, achieving efficient data transmission (such as communication between the engine, transmission, and instruments).

Advantages:

• Reduce the weight of the wiring harness (traditional wiring harnesses may account for 5% of the total vehicle weight).
• Improve data transmission speed (such as vehicle speed and fault code sharing).

Application

The engine ECU communicates with the transmission ECU.

The dashboard displays the vehicle status (such as fault lights).

3. Common Faults and Maintenance of Automotive Wiring Harnesses

Although the wiring harness design is reliable, problems may still occur after long-term use:

(1) Common faults

• Open circuit: Wire breakage (such as frequent opening and closing of car doors causing fatigue of the wiring harness).
• Short circuit: The insulation layer is damaged, causing the positive and negative poles to come into contact (which may burn out the fuse).
• Poor contact: Terminal oxidation or loosening (such as the headlights flickering on and off).
• Corrosion: A humid environment causes the wiring harness to rust (especially the chassis wiring harness).

(2) Maintenance suggestions

• Regularly inspect the appearance of the wiring harness (for any wear or aging).
• Avoid modifying the circuit privately (which may cause overload or short circuit).
• After wading through water, check whether the wiring harness has taken in water (especially the engine wiring harness).

4. Future trends: Lightweight and intelligent wiring harnesses

As the degree of automotive electronicization increases, wiring harnesses are also constantly evolving:

• Lightweighting: Use aluminum wires and optical fibers to replace some copper wires (such as Tesla reducing the length of wire harnesses).
• High-speed data transmission: Supports in-vehicle Ethernet (for autonomous driving and high-definition cameras).
• Modular design: Simplifies installation and maintenance processes.

Aichie is a leading provider of connection solutions in the industry, focusing on producing high quality connectors, cables and wire harnesses. Aichie has hundreds of skilled employees in two factories, the domestic factory is located in the famous manufacturing city Dongguan City China , and the overseas factory is located in Tan Uyen City, Binh Duong Province, Vietnam. Products are widely used in industries such as Automobiles, Clean Energy, Automation manufacturing, and Smart Homes.

Welcome to cooperate with us, we will do our best to help you win much more business opportunities!

Send inquiry: sales03@aichie.com

Although the automotive wiring harness may seem insignificant, it is the core of the entire vehicle's electrical system. From engine control to airbags, from headlights to entertainment systems, every wire is playing a silent role. Understanding the classification and functions of wiring harnesses can not only help car owners maintain their vehicles better, but also enable us to have a deeper understanding of the operating principles of automobiles.

The working conditions for steel mill bearings are demanding as they will face dust, steel particles, water, heat, high speed and high temperature.

Four-row cylindrical roller bearing works as the radial cylindrical roller bearings on the roll neck. Its performance values the most for the rolling mill bearings.

ESG Bearing, as an expert on steel rolling mill bearings. We are always improving ESG quality to better meet steel mill’s requirements. With years of testing, ESG Bearing now announced that ESG has successfully make our four-row cylindrical roller bearings with steel cage.

The working life, wear-resistance and performance of the radial cylindrical roller baring with steel cage proves to be better than bearing with brass cage.

Mechanical Performance
Cage	Tensile Strength	Yield Limit	Peel Strength	Hardness
	σb	σ0.2	δ	HB
steel cage	＞400MPα	＞250MPα	18%	＞160~190
brass cage	＞250MPα	＞120MPα	15%	80~100
steel cage brass cage
＞ 90% clients re-order four-row cylindrical roller bearing with steel cage

Bilateral double-row thrust tapered roller bearings are a specific type of bearing designed to carry higher axial loads on the roll neck of the rolling mill stands. As the name implies, they can carry axial loads in both directions.

Usually, they are more often used in modern rolling mills, working with four-row cylindrical roller bearings, and double-row cylindrical roller bearings. Compared with angular contact ball bearings, and deep groove ball bearings, they can achieve the requisite axial loads with less space of the bearing housing.

Four row cylindrical roller bearings + Thrust Bearings

Cylindrical roller bearings inner diameter works together with roll neck to endure radial force. It has the advantages of heavy load, high rotation speed limit, high precision,inner and outer rings seperability and replacability, easy procession, lower production cost and convenient mounting and dismounting. The thrust bearings endure axial force. The detailed structure type can be chosen based on rolling mill feature.

When the heavy load speed is slow, the cylindrical roller bearings work with thrust bearings to endure thrust load with smaller axial clearance. When the rolling speed is higher, it works with angular contact ball bearings with higher rotation speed limit and with strick control of axial clearance to make the roller work with close axial guide and endure general axial load force.

This bearing specification type has the advantage of longer bearing life, reliability, high presion of the rolling products and easy control. So they are applicant widely in wire steel rolling mill, plate steel rolling mill,frame rolling mill, double-support roll of cold rolling mill and hot rolling mill.

Four Row Tapered Roller Bearings

Four row tapered roller bearings can endure both radial force and axial force without thrust bearings to make the main machine more compact. The inner diameter and the roll neck of four row tapered roller bearings work together with loose fit-up for convenient installation and dismounting. However sometimes the loose fit-up will slip. So the inner diameter will be made with screw oil tank.

At present, this specification model is still widerly applied in the working rolls of the four row hot rolling mill and cold rolling mill, bloomer and beam rolling mill.    

In the realm of industrial machinery, where efficiency and reliability are paramount, the precision of each component plays a pivotal role. One such critical component is the rolling mill bearing, and in our pursuit of excellence, we've elevated our manufacturing process to deliver super precision on the contact surface of the bearing roll way.

The Precision Engineering Process: Our commitment to quality begins with the meticulous engineering of the rolling mill bearings. We employ advanced technologies and cutting-edge manufacturing processes to achieve super precision on the crucial contact surfaces. This precision is particularly concentrated on the bearing roll way, ensuring an unparalleled level of accuracy in its form and function.

The precision engineering process involves the use of state-of-the-art machinery, stringent quality control measures, and the expertise of our skilled engineers. We leave no room for error, consistently adhering to tight tolerances to create a flawless and high-performance rolling mill bearing.

Benefits of Super Precision Rolling Mill Bearings:

1. Enhanced Performance: The super precision on the contact surface of the bearing roll way translates to superior performance in real-world applications. The precisely crafted bearings contribute to smoother operations and reduced friction, optimizing the overall efficiency of the rolling mill.

2 Extended Service Life: The precision-engineered bearings are designed to withstand the rigors of heavy-duty industrial applications. By minimizing wear and tear through precise construction, these bearings boast an extended service life, reducing downtime and maintenance costs.

3. Consistency in Operation: The uniformity achieved through super precision ensures consistent performance across all units. This consistency is crucial for the seamless operation of the rolling mill, contributing to the reliability of the entire system.

ESG Bearing started running our new bearing warehouse recently.

ESG Bearing has been making bearings for steel mills of billets, rebars, sections, angles, coils, for years. We deeply know what steel mills are always looking for. Quality bearing with the fastest delivery.

ESG Bearing has a large stock of steel mill bearings for better service to our clients. Our stock covers most of the highly wanted bearing models for steel mill bearings. Our immediate delivery will also help steel mills reduce their stock and cost for maintenance.

You may also contact us for regular update of our stock list.