What Types of Heat Transfer Paper are there?

There are many ways to divide the types of thermal transfer paper.

The hot stamping temperature is divided into high-temperature heat transfer, medium-temperature heat transfer, and low-temperature heat transfer.

The method of tearing off the bottom paper is divided into hot stripping, warm stripping, and cold stripping. Hot stripping is to tear off the backing paper immediately while it is hot; warm stripping is to wait for a few seconds, and tear off the backing paper when it is warm; cold stripping is to slowly tear off the backing paper after completely cooling.

According to the effect after ironing, it can be divided into breathable, dyed, soft, and three-dimensional thermal transfer paper.

According to the principle of thermal transfer, it can be divided into hot melt adhesive type and sublimation type thermal transfer paper.

Hot melt adhesive type heat transfer paper

Hot melt adhesive type heat transfer paper, also known as film heat transfer paper, contains a coating that acts as a hot melt adhesive. The pattern surface of the heat transfer paper is attached to the printed object, and the back of the paper is heated appropriately. Applying pressure, the coating adheres to the fabric, acting as a carrier and transfer. The use of adhesive film heat transfer paper will leave a layer of glue on the printed matter to varying degrees, making the pictures and texts more eye-catching and prominent, but there will be a feel.

Sublimation heat transfer paper

Sublimation type thermal transfer paper refers to printing the thermal sublimation transfer ink on the paper and overlapping the printed paper with the fabric to heat, pressurize or decompress, and disperse dyes on the paper sublimated and transferred in a gas phase state. onto the substrate. Its main feature is that the dye in the transfer ink is sublimated by heat and penetrates the surface of the object. After sublimation, a bright color image is formed, so the thermal transfer product has no hand feel, the image will not fall off, crack, and is durable.

Among the above two thermal transfer printing technologies, the sublimation thermal transfer printing technology is more mature. The advantage is that after transfer on the fabric, the feel and thickness remain unchanged, and it is especially suitable for transfer on light-colored and white chemical fiber fabrics. However, sublimation heat transfer is only suitable for products with polyester fibers on the surface, and cannot be used on pure cotton knitted fabrics or dark-colored fabrics.

The reason why polyester fiber can be sublimated for thermal transfer printing is that the amorphous area of ​​polyester fiber has tiny voids of 10~100Å. When the temperature rises to about 200°C, the amorphous area moves violently, the voids increase, and gradually form The semi-molten state, that is, the formation of the so-called liquid layer creates conditions for the gaseous disperse dyes to enter the fiber. On the other hand, at this temperature, the dye sublimates into a gaseous state, and due to the attraction of van der Waals force, the gaseous dye moves around the polyester fiber and then diffuses into the amorphous region to achieve coloration.

Cotton fibers cannot be directly transferred with dispersed dyes because the amorphous region has very small voids and no thermoplasticity in the dry state. When the temperature rises, not only the so-called liquid layer is not formed, but also the gaseous dispersed dyes are not attractive, and most of the dyes escape or stay on the transfer paper.

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