What you need to know about sublimation fastness and sublimation fastness testers

What is sublimation fastness? Iron Fastness (color fastness to heat pressing)

Iron fastness refers to the degree to which a dyed fabric changes color or fades when pressed.

The degree of discoloration is determined by dyeing other fabrics with the iron . Scorch fastness is rated from 1 to 5, with 5 being the best and 1 being the worst.

When testing the scorch fastness of different fabrics, the temperature of the test ironused should be selected.

Dry pressing

Dry sample is pressed with a heating device at a certain temperature and pressure for a certain time.

Damp pressing

A dry sample is covered with a damp cotton cloth and pressed with a cloth heater at a specified temperature and pressure for a specified time.

Wand pressing

The top of a wet sample is covered with an adjacent wet cotton fabric and covered with a Heater pressed at a specific temperature and pressure for a specific time.

Sublimation fastness (color fastness to dry heat)

Sublimation Color fastness is the degree of sublimation of dyed fabric during storage.

Sublimation fastness The level of distortion, fading and stainingThe color of white fabric after the heat press treatment is evaluated using a greyscale swatch card and is divided into 5 levels, with 1 being the worst and 5 being the best reach~ 4 to meet the wearing needs.

Principle

The sample of the textile that comes into contact with one or two specified adjacent fabrics, is heated by close contact with a medium heated to the required temperature. The color change of the specimen and the discoloration of the adjacent fabric are assessed with the gray scales.

The influencing factors of sublimation fastness

It is related to the dye itself: Low temperature dyeing is worst, and high temperature dyeing is best.
Related to the heat treatment temperature of dyeing: the setting temperature after baking should be mastered welln. Too high or too low a temperature will affect sublimation fastness.

What is sublimation color fastness test? Color fastness using the heat press methodSamplesIf the textile to be tested is fabric, use a 40mm × 100mm sample. If the textile to be tested is yarn, knit it into fabric and use a piece 40 mm × 100 mm or wrap it around a piece of thin inner material measuring 40 mm × 100 mm tightly to form a layer form that is only the thickness of the yarn. If the textile to be tested is loose fibre, comb and compress enough of it to form a 40mm × 100mm layer and sew the sheet to an adjacent piece of cotton to support the fibre. Process1.General

1.1 The choice of pressing temperature used depends to a large extent on the type of fiber and the construction of the fabric or garment. In the case of mixturesalso recommended to use the temperature that corresponds to the fiber with the lowest heat resistance. The following temperatures cover three commonly used pressing conditions:

110℃±2℃

150℃±2℃

200℃±2℃

Other temperatures can be used if required, provided they are noted separately in the test report.

1.2 Samples of material that have undergone heat or drying treatment shall be conditioned in a standard temperature atmosphere for textile testing compliance with ISO 139, i. H. 65%±2%RH and a temperature of 20℃±2℃ before being tested.

1.3 The bottom plate of the heater is covered with the heat-resistant film. Wool flannel padding and drying. Undyed cotton cloth .regardless of whether the plate is heated or not.

2.Press dry

Place the dry sample on the cotton cloth covering the wool flannel padding. Lower thosetop platen off the heater and hold the sample at the indicated pressing temperature for 15 s.

3. Wet Press

Place the dry sample on the cotton cloth covering the wool flannel padding. Next, soak a piece of cotton Place a 40mm × 100mm fabric in grade 3 water and squeeze or extract until it contains its own mass of water. Place the wet fabric on top of the dry sample. Lower the top platen of the heater and allow the sample to stand for 15 minutes s at the specified pressing temperature.

4. Wet pressing

Soak the sample and an adjacent piece of cotton (40 mm × 100 m).m in grade 3 water and squeeze or extract until they contain their own mass of water. Place the wet sample on top of the dry cotton cloth covering the wool flannel padding and place the wet adjacent fabric on top of the sample. Lower the top plate of the HHeater and leave the sample at the specified pressing temperature for 15 s.

Dry Heat Color Fastness Method. Specimens Connect the heater to a piece of adjacent multifiber fabric of the same size by sewing along one of the shorter sides, with the multifiber fabric adjacent to the face of the specimen; or attach a sample between them of a size equal to the size of the heater. The two adjacent single fiber fabrics of the same size are made by sewing along one of the shorter sides.

If yarn or loose fiber is to be tested, take a mass of the yarn or loose fibers, which corresponds to about half of \'. the total mass of the adjacent fabrics and

Place it between a piece of the adjacent multi-fiber fabric of the same size as the heater and a piece of the non-dyeable fabric of the same size and sew them to all vier pages together. Or put it between each piece of them. Sew together two predetermined single-strand fabrics the size of the heater and sew on all four sides. ProcedurePlace the composite in the heater and leave it there for 30s at one of the following temperatures:

150℃bottom 2℃

180℃±2℃

210℃ ±2℃

Other temperatures can also be used on request, provided they are specifically noted in the test report table. The pressure on the sample must be 4 kPa ± 1 kPa.

Remove the composite sample and leave in air for 4 hours in the standard temperature atmosphere for testing according to ISO 139, i.e. H. a temperature of 20°C ±2℃ and a relative humidity of (65±2)%. In tropical countries, the standard tropical atmosphere can be used for testing according to ISO 139, i.e. H. a temperature of 27℃±2℃ and relative humidity of (65 ± 2)%. Evaluate the color change using the gray scalesof the sample and the staining of the adjacent fabric compared to portions of the adjacent fabrics similarly treated in the absence of a sample. What is that? Relationship between sublimation and fastness quality of disperse dye?

Polyester fabric is dyed with disperse dyes and subjected to dry heat treatment above 130°C, such as e.g. B. Post-dyeing hot stretching, resin baking, etc., which usually varies in different degrees in the following three aspects. For example, dye fastness (soap washing, rubbing, sun exposure) is usually reduced by 0.5-1.5 degrees. The color light of the fabric surface changes to different degrees; the soiling of the cotton viscose component of the woven fabric or blend increases.

Sublimation Fastness Tester

Application:

The scorch and YG605 Series Sublimation Fastness Tester is designed to determine color fastness to hot press and dry heat and to perform sublimation testing.Provides controlled dry heat and pressure conditions with heated top and bottom sides, electronic temperature controller and carefully controlled top panel weight.

Feature:

Equipped with MCU to control time and timeTemperature and over-temperature safety function to shut down the device when overheated.HHigh quality temperature sensor (PT100), more precise temperature control and more durable. Two separate heating coils for the upper or lower heating platen can be operated individually Operating under relative standards. The temperature of the 3 group heating blocks is controlled separately (for YG605-III).

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