In modern industrial production, efficient operation and long lifespan of equipment are key factors in improving productivity. However, equipment will face problems such as friction, vibration, and impact during long-term and high load operation, which can lead to rapid wear and frequent failures, thereby increasing maintenance and repair costs. Therefore, reasonable selection and use of buffer pads have become an important means to reduce equipment maintenance costs.

In various fields such as industrial production, electronic equipment manufacturing, transportation packaging, etc., laminated cushioning pads play a crucial role as important protective components. They not only effectively absorb shock and evenly distribute pressure, but also provide protective isolation to prevent damage to items during transportation or use. However, there are many types of cushion pads in the market, and how to choose the compression cushion pad that suits your needs has become a challenge for many enterprises in procurement and production. Material is one of the key factors determining the performance of cushioning pads, and different materials have different physical properties, durability, and applicable environments. Common cushion materials include silica gel, rubber, polyurethane, foam and plastic. Each material has its unique advantages and applicable scenarios.

In the process of automobile manufacturing, with the continuous advancement of technology, more and more high-precision components are being applied to various fields of automobiles. Especially in vehicle manufacturing, electronic system assembly, interior processing, and the production of other key components, release film plays a crucial role as an indispensable auxiliary material. Release film not only effectively protects the surface of automotive components from contamination, scratches, or adhesion during processing, transportation, and storage, but also improves assembly accuracy, ensuring production efficiency and product quality.

The release film under high temperature environment must have strong heat resistance and stability. This is because in many production processes, such as composite material molding, electronic component packaging, and automotive parts manufacturing, the process temperature involved may reach up to 200 ° C or higher. Therefore, release films need to maintain the stability of their physical and chemical properties under high temperature conditions to avoid thermal degradation, melting, aging, or deformation at high temperatures.

With the widespread use of multi-layer boards and HDI boards, PCB manufacturers have gradually realized a key auxiliary material that has been neglected for a long time - the cushion pad, in the process of improving the compression yield. Especially when facing complex structures such as high-order blind buried hole plates, thick copper plates, and rigid flex joint plates, pressing problems occur frequently, such as warping, bubbling, copper surface pressure damage, resin accumulation, etc. Then, how to choose the most suitable cushion pad for your product and process?

In the current large-scale application of high-density interconnect (HDI) boards, the lamination process has always been the top priority for quality control. Whether it's smartphone motherboards, car system control boards, or advanced communication base station equipment, HDI technology is irreplaceable in improving integration and signal integrity. However, many manufacturers frequently suffer from issues such as warping, bubbling, blind hole cracking, delamination, and copper surface damage during HDI board lamination. These problems are not uncommon. Where is the problem? Many times, it's not a big problem with the equipment or design, but rather you may have overlooked a key auxiliary material - the compression buffer pad. Today we will delve into why HDI board lamination is prone to problems, and how to effectively improve lamination quality and product yield by selecting suitable cushioning materials.

With the rise of high-end applications such as 5G communication, artificial intelligence, and automotive electronics, PCB boards have increasingly more layers and more complex structures. For multilayer boards like 6-layer, 8-layer, or even 22-layer and beyond, the stability of the lamination process directly determines the performance and yield of the circuit board. Among these, an overlooked material—the lamination buffer pad—plays a crucial role in enhancing lamination quality. Multilayer PCB is made by bonding multiple copper-clad laminates and pre impregnated resin layers (PP) through a lamination process. As the number of layers increases, the thickness of the board increases, the requirements for alignment accuracy improve, and the accumulation of thermal stress increases, resulting in a geometric multiple increase in manufacturing difficulty.

In the high-precision PCB manufacturing process, lamination is one of the core processes that affect the final product quality. However, common issues such as bubbling, warping, delamination, and copper surface damage during lamination often perplex engineers. Beyond stack-up design, equipment parameters, and lamination programs, there is another easily overlooked "hidden contributor" playing a crucial role—namely, the lamination cushion pad. The PCB lamination process is essentially a thermal compression bonding process: multiple layers of materials (such as copper foil, core boards, prepreg, etc.) are bonded under high temperature and pressure to form a complete multi-layer circuit board structure.

In the manufacturing of multi-layer PCBs, the success or failure of the lamination process directly determines the yield and performance stability of the product. In the lamination process, a crucial auxiliary material that is easily overlooked is the compression cushion pad (Cushion Pad/Press Pad), which often determines whether the finished board is "flat, non foaming, and non pressure damaged". This article will systematically explain "how to choose a cushion pad" from five aspects: the principle of cushion pad, material selection, matching strategy, common problems, and selection suggestions. It will help you improve the quality of compression and make your multi-layer board more stable and flat!

In the PCB manufacturing process, the most commonly focused aspects are typically "key process steps" such as etching accuracy, lamination stability, conductivity quality, and AOI inspection. However, a "minor player"—the release film—often goes overlooked. In fact, although the release film does not directly participate in circuit conduction, it plays an indispensable role in multiple stages, including dry film lamination, pattern transfer, lamination alignment, and finished product protection. If this film is not chosen properly, it may lead to issues such as film blistering, pattern misalignment, lamination delamination, surface scratches, and ultimately result in batch rework and yield reduction. So, how exactly does a "good" roll of release film help improve PCB manufacturing yield?

In high-precision manufacturing fields such as electronic die-cutting, FPC processing, OCA lamination, display module assembly, and semiconductor material transfer, release film serves as a "surface carrier," consistently positioned at the forefront of the production process. Although it does not directly form part of the product, it plays an extremely critical role in the manufacturing process—supporting, isolating, positioning, and protecting. Behind all these functions, "cleanliness" stands as the core foundation ensuring the stable operation of all processes.

In the daily production of industries such as electronic die-cutting, FPC manufacturing, label backing, optical bonding, etc., "release film residue" is a common and headache problem. It not only pollutes the surface of the product, but also causes poor die-cutting, bonding failure, functional abnormalities, and even leads to customer complaints and large-scale rework. However, truly solving the problem of residual glue is not as easy as simply changing a roll of film. Many engineers and procurement personnel often blame "poor film quality" and "too sticky glue" when encountering problems, but overlook the details hidden behind the process, formula, environmental control, and so on. Whether a release film has residual adhesive is actually the result of the coupling of multiple factors such as material system and process conditions. This article will provide in-depth analysis from below perspectives to help you systematically solve the pain point of "resin residue".