Zipper Fin

Zipper fin 

A heat sink fins like zippers

What is Zipper Fin?

Zippers are a very good invention because they can connect two pieces of cloth to one. By using a special geometry, it can interlock with itself, thus achieving continuous connection. This makes it easier to handle a zipper as a whole, rather than manipulating each individual part. When we want to use a lot of thin fins on the fins, it's very painful to assemble each one. That's what zipper fin do.

The zipper fin is a metal sheet that is stamped step by step. First, use the punch to create the geometry of the fins. Length, height and fins pitch are determined in the first set of punches.The fins thickness are determined by the thickness of the fins used. In the process of secondary punching, the fin is folded up and locked together with the previous fin.When the fin stack has enough fins for the application of the stack, it will be removed from the punching area and ready to become a complete zipper fin heatsink.

Each zipper fin heatsink has its own design for progressive perforating fins.This makes the application of the zipper fin assembly more specific, as any new zipper fin heat sink structure usually requires a new set of punche machine. Zipper fin heat sink are ideal for high-volume applications rather than low volume production runs, as stamping costs will be spread over fewer heatsink.

Zipper fin manufacturing process

1. Zipper fin is a process commonly used in the processing of thin fin.

2. Zipper fin is used for the processing process of combining the single thin fin formed by stamping AL1050&CU1100 into a dense parallel fin. The specific method is as follows: when forming, a small section of specially designed protruding part (buckle point) is retained at the edge of the fin. The fin is fixed in a customized mold, and the protruding part is bent and locked together to form parallel fins in neat arrangement.

3. Another purpose of the use of zipper fin is to compensate for the interface impedance resulting from the subsequent connection (usually brazed) between the fin and the heat-absorbing bottom.The connection area between the thin parallel sheet fin and the heat-absorbing base is small, and considering the actual connection rate and interface impedance of the connection surface, the heat transfer between the heat-absorbing base and the fin may become the bottleneck in the entire heat conduction path of the heat sink.Therefore, the blade folding process will leave a folding edge on the side where the fin will be connected with the heat-absorbing bottom. After bending the lock, the blade will be combined into a relatively flat surface, that is, each fin will have a "wider" bottom, and the side will become an "L" shape. In this way, heat is transferred from the heat-absorbing base to the "bottom" of the individual fin through the connection surface, and from the inside to the vertical part where the heat is actually lost.

Zipper fin heat sink materials

The benefit of having two separate components is that you can mix and match materials.The zipper fin heat sink material can be copper base and aluminum fins, or  copper fin and aluminum base. Depending on the application requirements, zipper fin heat sink material may need an all-aluminum or all-copper. The material determines the joining between the fin and the base. Aluminum resists soldering, so the aluminum/aluminum joints are epoxy bonded. Epoxy does not adhere well to copper, so copper/copper joints are easy to weld. If mixed the two, the aluminum components are usually nickel-plated and then the assembly is soldered together.

Zipper fin heat sink are a great heat transfer solution. While Lori uses them in the simplest form, zipper fin has a wide range of application and deign flexibility. Contact Lori team for assistance with your zipper fin heat sink design.

Zipper fin heatsink Features

1. Advantages: simple mechanical locking structure, fewer procedures; The interface impedance generated by the subsequent connection between the fin and the heat-absorbing base can be compensated; Process quality is relatively stable, suitable for mass production.

2. Disadvantages: in order to ensure the stability and tidiness of the combination, the design requirements for the single fin stamping die are relatively high.

3. Typical products: combined with stamping, they are mainly used to manufacture parallel dense thin fins for reflow welding or wind duct design.

How lori uses zipper fin heatsink?

Lori stack the zipper fin on the base as a heatsink assembly. Lori only uses zipper fin heat sink like this, so you can easily compare one heat sink with these fins to other heat sink types. But zipper fin stacks can also be embedded with heat pipes to produce generate self supporting heat sinks or larger tower heat sinks.

Contact Lori team for assistance with your zipper fin heat sink design.

Aluminum Zipper fin heat sink

Aluminum zipper fins stacks and aluminum base 

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Aluminum and copper zipper fin heat sink

Aluminum and copper zipper fins stacks and aluminum base 

Aluminum Zipper fin heat sink

Aluminum zipper fins stacks and aluminum base 

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