ABSORBENCY

About Absorbency

Water absorbency, oil absorbency, adsorption, sound absorption, moisture absorption, moisture absorption and desorption, etc,
It demonstrates high absorbency in various scenes. We are proud of its high absorbency.

Absorption

Absorption

Pulp is the fiber with the best cost performance for absorbency among fibers. Pulp air laid nonwoven fabrics, which use pulp as the main raw material, also vary in absorbency depending on the amount of pulp used. The water absorption ratio of pulp air laid nonwoven fabrics is as high as about 35 times its own weight, and the water absorption can be further increased by blending with super absorbent polymer (SAP) or super absorbent fiber (SAF). It is used in many fields, such as sandbag sheets, water shielding sheets, absorbents for panty liners and incontinence pads, and evaporation and humidification materials.

Oil Absorption

Oil Absorption

Pulp air laid nonwoven fabrics absorb oil (vegetable oil) 12 times their own weight. It is used for wiping off machine oil stains, wiping off ink stains in printing plants, etc. It is also used as cooking paper to drain oil from fried food and as an underlay (tray mat) for deli trays to cut excess oil.

Adsorption

Adsorption

Sheets blended with porous functional materials such as activated carbon, carbon fiber, silica gel, and zeolite have excellent gas adsorption properties. SOx and NOx are contained in flue gas from coal-fired thermal power plants and factories and in vehicle exhaust. The activated carbon adsorption effect desulfurizes and denitrifies the gases. *Not all gases can be treated with this product.

Sound Absorption

Sound Absorption

Air laid nonwoven fabrics with many voids are effective as porous sound absorbing materials. Its sound absorption effect is particularly pronounced in the mid to high frequency range. It is used as a removable sound absorbing material for noise reduction in home appliances and air conditioning. There is also a water-repellent type sound-absorbing material recommended for outdoor use.

Moisture absorption

Moisture absorption

In a process that does not use water at all, super absorbent fibers (SAF) can also be blended. There is no concern about powder loss, and the material retains its shape after absorption. It is used in many fields, including industrial materials, medical, and daily sundries, such as dehumidification during transport packaging and prevention of dew condensation in electrical control boxes.

Moisture Absorption/Desorption

Moisture Absorption/Desorption

In Japan, where summers are hot and humid and winters tend to be cold and dry, humidity and temperature fluctuate widely. Sheets containing highly water-absorbent fibers or silica gel absorb moisture at high humidity and expel moisture at low humidity, maintaining an ideal condition inside an airtight space. They are used to maintain freshness in the vegetable compartment of refrigerators and as humidity-regulating materials for housing.

Others

Others

Air laid nonwoven fabrics with a structure that has many voids can absorb not only light, low-viscosity liquids such as water, but also high-viscosity liquids such as various kinds of medicines and blood. Air laid nonwoven fabrics are used in many fields such as air freshener volatiles, absorbents for hygiene products, and cosmetic puffs.

Effects of basis weight and thickness

Pulp, which has the highest absorbency of all fibers, is used as the main raw material.
The amount of absorbency increases depending on the amount of the blend. Also, the lower the density, the higher the absorbency.

Absorbency

KINOCLOTH process

KINOCLOTH process

Kinocloth is a pulp fiber-based sheet. A sheet with a basis weight of 60 g/m² and a thickness of 1.2 mm absorbs approximately 2,100 g/m² of water!

TDS process

TDS process

A product of the TDS process capable of producing thicker and higher basis weight nonwoven fabrics. A sheet with a basis weight of 1,200 g/m2 absorbs approximately 11,000 g/m2 of water!

*The above values are measured values, not guaranteed values.

Effects of Super Absorbent Polymer (SAP) and Super Absorbent Fiber (SAF)

Super Absorbent Polymer (SAP) is well known as an absorbent for disposable diapers and sanitary products, and Super Absorbent Fiber (SAF) is a fiber made from the same resin. Because of this feature, it is difficult to use them in the sheet manufacturing process through the use of water. Dry nonwoven fabric manufacturing methods such as our air laid method can make full use of their characteristics.

Comparison of SAP and SAF

Left: SAP blended product Right: SAF blended product

About Super Absorbent Polymer (SAP) blended products

SAP (Super Absorbent Polymer), which absorbs and swells to form a gel when in contact with water and exhibits high moisture retention, is blended to further increase absorbency: SAP alone has an absorption capacity several hundred times greater than its own weight in tap water, and 40 times greater in saline solution, which is intended for urine and other body fluids. In addition, it hardly releases water even when pressure is applied.

Absorbency

<Horizontal water absorption>
Sodium chloride solution with a concentration of 0.9 w/v%

KINOCLOTH process

KINOCLOTH process

B・SAP is a combination of "Kinocloth" and SAP. It features excellent water absorbency and sag resistance, showing high absorbency even in saline solution.

<Horizontal water absorption>

Distilled water

TDS process

TDS process

A sheet containing 250g/m2 of SAP in TDS has a high absorption capacity of over 60,000g/m2! Further blending up is also possible.

*The above values are measured values, not guaranteed values.

About Super Absorbent Polymer (SAP) blended products

Super Absorbent Polypropylene (SAP) in fibrous form, which exhibits the same excellent absorbency as SAP, with almost no spillage from the edge surface compared to SAP, and is less likely to lose its shape even in a swollen state after water absorption. It is also less likely to feel grainy, even with thin fabrics. Not only does it excel in water absorbency and moisture absorption, it also excels in repeated moisture absorption and desorption with changes in relative humidity.

Water absorbency

<Horizontal water absorption>
Distilled water

Basis weight: 210 g/㎡
Thickness: 2.3 mm sheet

Water absorbency

Pulp air laid nonwoven fabrics are made mainly from pulp, which is highly absorbent to begin with, but by blending SAF, the absorbency can be further improved. The amount of water absorption can be increased by increasing the percentage of SAF blended in the same basis weight and thickness.

Moisture Absorption


Moisture Absorption

Basis weight: 640 g/㎡
SAF 40% blended sheet

Moisture Absorption

SAF blended sheets absorb moisture differently depending on the environment, such as temperature and humidity. The higher the temperature and relative humidity, the higher the moisture absorption, but if the temperature is high but the relative humidity is low, the moisture absorption will be suppressed. And where the relative humidity is high, the higher the temperature, the faster the moisture absorption and the greater the amount of moisture absorbed will be.

*The above values are measured values, not guaranteed values.

Moisture Absorption/Desorption

Moisture Absorption/Desorption
*1: 25°C, 90%RH, after 240 min, pre-treatment: 105°C (dry) *2: 25°C, 35%RH, after 90 min, pre-treatment: 25°C, 90%RH

SAF blended sheets show superior performance in moisture absorption and desorption when compared with our sheets containing similar amounts of each material. It has superior moisture absorption and desorption properties than pulp, activated carbon, and silica gel.

Repeated Moisture Absorption/Desorption

30°C/90%RH-20°C/50%RH repeated test
Repeated Moisture Absorption/Desorption Minimal
performance
drop with
repetition

By adjusting the amount of SAF blended, the amount of moisture absorption, moisture absorption rate, etc. can also be controlled. It also has excellent moisture desorption properties, so when temperature or humidity decreases, moisture absorbed can be desorbed, thereby enabling repeated moisture absorption. Even a saturated moisture-absorbing SAF blended sheet will release more than 80% of the moisture it has absorbed. In addition, its moisture absorbency and desorbency is characterized by the fact that even after repeated moisture absorption and desorption, there is almost no degradation in performance.

*The above values are measured values, not guaranteed values.

Absorption behavior of a sheet containing super absorbent fiber (SAF)

*The movie is an image to express the absorption capacity.

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