In-Depth Analysis of Shape-Memory Umbrellas: Differences Between Heat-Processed and Panel-Type

In recent years, 'shape-memory umbrellas' have been gaining attention in the folding umbrella market.

With just one fold, the fabric naturally gathers neatly, reducing common frustrations with traditional folding umbrellas such as 'difficult to fold neatly' or 'time-consuming to store.' As a result, they are becoming increasingly popular as everyday-use umbrellas for commuting, school, and outings.

However, while all are called 'shape-memory,' there are actually significant differences in processing methods.

KIZAWA, as a specialist umbrella retailer engaged in product development, has conducted extensive verification of the structure and processing methods of shape-memory umbrellas through collaboration with partner factories. This time, from a specialist's perspective, we will explain the differences between 'heat-processed' and 'panel-type' methods, their respective advantages and disadvantages, and key points to check before purchasing.

There Are Two Main Types of Shape-Memory Umbrellas

Currently, shape-memory processing used in folding umbrellas can be broadly divided into the following two types:

### 1. Heat-Processed Type

This method involves applying heat to the fabric to create creases, enhancing ease of folding.

At KIZAWA, we name this heat-processed shape-memory umbrella 'Selfold'.

### 2. Panel-Type

This method involves bonding panel-like components to the inner side of the umbrella fabric to assist fabric movement, making it naturally gather when the umbrella is closed.

At KIZAWA, we name this panel-type shape-memory umbrella 'Pattofold'.

Both technologies aim for 'ease of folding,' but because their processing methods differ, their suitable applications and precautions also vary.

Selfold | Advantages and Disadvantages of the Heat-Processed Type

### Advantages

The main appeal of Selfold is that creases form clearly, allowing the fabric to gather neatly when the umbrella is closed.

With conventional folding umbrellas, users must carefully roll each panel one by one. However, with the heat-processed method, the fabric naturally returns along the creases, reducing stress during storage.

Additionally, because it is a relatively simple processing method, it is easy to commercialize and integrate into daily use.

### Disadvantages

On the other hand, there are also precautions with the heat-processed method.

Shape memory via heat processing involves applying heat and pressure to the fabric to create creases. However, standard umbrella fabrics cannot be directly heat-processed. The fabric's material, thickness, and processing method must all be designed to be compatible with heat processing.

An important point here is that 'rain umbrella fabrics compatible with heat processing' and 'fully UV-blocking fabrics compatible with heat processing' have different properties.

Rain umbrella fabrics compatible with heat processing are designed with waterproofing in mind, intended for use in rainy conditions. Therefore, if made with appropriate fabric and processing conditions, there is no excessive need to worry about rain leakage from the crease areas.

### Selfold | Rain Umbrella Lineup

- Opera: Ultra-lightweight with automatic open/close - forte+: Larger size with 55cm ribs - wsip: Big size with 60cm ribs - lupo: Automatic open/close with 65cm ribs

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On the other hand, fully UV-blocking sun umbrella fabrics have a laminated coating on the backside for shading and UV protection. This lamination achieves high UV-blocking performance, but when creases are formed via heat processing, stress tends to concentrate at those points.

Therefore, even with fully UV-blocking fabrics compatible with heat processing, there is a risk of rainwater seeping through the crease areas.

At KIZAWA, prioritizing the functionality and quality of fully UV-blocking sun umbrellas, we recommend the Selfold series' fully UV-blocking sun umbrellas for 'sun use only'.

### Selfold | Sun Umbrella Lineup

- stella: Three-fold compact design - opal: Compact five-fold design - mono: Larger size with 55cm ribs

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Whether a fully UV-blocking sun umbrella with shape-memory processing can be safely used as an all-weather umbrella cannot be determined by appearance alone.

Marketing umbrellas with heat-processed fully UV-blocking fabric as 'all-weather' without sufficient explanation may lead to customer misunderstanding.

At KIZAWA, we value clear communication—not only about convenience but also about material characteristics and usage precautions—to ensure customers do not misunderstand the intended use.

Pattofold | Advantages and Disadvantages of the Panel-Type

### Advantages

The feature of Pattofold is that it does not place excessive thermal stress on the fabric itself, but instead uses a panel structure to naturally gather the fabric.

Because the fabric aligns neatly when the umbrella is closed, it can be stored quickly and easily, making it convenient for busy mornings or use while traveling.

Additionally, since it does not involve strong heat processing on the creases, it is easier to design with compatibility in mind for fully UV-blocking or coated fabrics—a key advantage.

### Disadvantages

On the other hand, there are also structural considerations with the panel-type.

Due to the panel structure, the fabric section tends to be thicker and heavier than standard umbrellas. As a result, the stress on the ribs during opening and closing, as well as during use, tends to be greater. With the same rib structure as a standard folding umbrella, there may be concerns about strength.

In KIZAWA's Pattofold series, we have addressed this by using thicker ribs than standard folding umbrellas. This design increases overall rib stability, making it better able to handle the stress from the panel structure.

However, thicker ribs tend to increase weight. For a folding umbrella, not only ease of folding but also portability and lightness are important.

Therefore, at KIZAWA, we use Toray's carbon fiber 'Torayca® T700SC' at the tip of the main ribs.

T700SC is one of the high-performance carbon fiber series 'Torayca®' developed by Toray. Lightweight yet strong, it is used in sports equipment and other fields where both lightness and strength are required.

By focusing on strength in high-stress areas while minimizing weight, we aim to achieve both 'ease of folding' and 'lightweight design'.

Pattofold is not merely an 'easy-to-fold' umbrella. By considering the panel structure, fabric weight, stress on ribs, and material selection, we aim to create a shape-memory umbrella suitable for daily use.

For Panel-Type Shape-Memory, Confirming Authenticity is Crucial

The processing technology for panel-type shape-memory is based on patented technology owned by a specific company in Taiwan.

Products manufactured through official channels come with an identification tag containing a code.

This tag is an important indicator to confirm that the product was manufactured using legitimate technology.

In recent years, some similar or counterfeit products without such tags have been sold at low prices.

Due to its special structure, the panel-type is more difficult to manufacture than standard umbrellas.

Without official technology and equipment, it is difficult to produce consistently high-quality products. Counterfeit products that only mimic the appearance may lack sufficient functionality or durability.

Relying solely on price may result in insufficient shape-memory performance or differences in durability. When purchasing, we recommend checking not only the product description but also the presence of an authenticity tag and the seller's explanation.