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| 2. Auxiliaries for a system of correcting faulty cloth |
| 2-1. |
Auxiliaries for system of decoloration of dyed polyester or CDP (Cation Dyeable Polyester)
Kayadecolor KP series (for dyes) |
 Decoloration of dyed polyester
| • |
Reductive decoloration
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 |
| • |
Reductive decoloration
→ oxidative decoloration
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| • |
Decoloration of dyed CDP
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 |
Treatment conditions
To achieve complete decoloration, it is recommended that oxidative decoloration be conducted after reductive decoloration
| Reductive decoloration |
| Kayadecolor KP-H |
6g/L |
(alkaline agent) |
| Kayadecolor KP-CY |
5g/L |
(decoloration agent) |
| Kayadecolor KP-LV |
2g/L |
(dispersing agent) |
| Kayadecolor KP-CH |
1g/L |
(chelating agent) |
| Hydrosulfite |
5-10g/L |
|
| Liquor ratio |
1:30~50 |
|
Treatment temperature and time: 135 x 40min |
| Oxidative decoloration |
| Kayadecolor KP-SP |
5g/L |
(decoloration agent) |
| Oxalic acid |
3g/L |
|
| Liquor ratio |
1:30~50 |
|
| Treatment temperature and time: 100 x 30min |
| Note: |
This recipe aims for complete decoloration. Even decoloration can be achieved without carrier spots if the indicated auxiliaries (5 items) are used. In addition, specks can be removed and staining
of the pot/machine avoided while the treated cloth itself will not be weakened. The use of hydrosulfite is very important since the use of thiourea dioxide due to the high temperature will reduce the
effectiveness by half. Oxidative decoloration is effective when conducted after reductive decoloration and is not effective when conducted alone. |
2-1-1. Kayadecolor KP-H
Characteristics
Alkali agents for decoloration
| • |
Kayadecolor is an auxiliary for the decoloration of polyester and CDP dyed with disperse or cationic dyestuffs. It combines the function of pH control with a disperse effect. |
| • |
Since this agent combines the function of pH control with a disperse effect, it can be used to simplify the decoloration process. |
| • |
This agent is suitable for decoloration in high pressure treatments, displaying excellent results. |
| • |
Since this agent is in powdered form, it is easy to handle. |
Quality specifications
The quality specifications for Kayadecolor KP-H are shown in the table below.
Kayadecolor KP-H: Quality specifications
| 1.Appearance |
White powder |
| 2. pH |
Approx. 11 (1% aqueous solution) |
| 3. Solubility |
Dissolves readily in warm water |
| 4. Packaging |
20kg cardboard case |
| 5. Handling |
Avoid contact with eyes, skin and clothing. Wear suitable protective equipment during operations. |
2-1-2. Kayadecolor KP-CY
Characteristics
Decoloration auxiliaries
| • |
Kayadecolor KP-CY is an auxiliary for the decoloration of polyester and CDP dyed with disperse or cationic dyestuffs, effectively releasing dyestuff that is diffused inside dyed fibers. |
| • |
Good heat-resistant stability to emulsification. |
| • |
Does not affect the colorfastness of dyed cloth. |
| • |
Suppresses the production of odors and smoke during the final setting. |
| • |
Warm water must be used during dilution. |
Quality specifications
The quality specifications for Kayadecolor KP-CY are shown in the table below.
Kayadecolor KP-CY: Quality specifications
| 1. Appearance |
Transparent yellow liquid |
| 2. Components |
Aromatic ester |
| 3. Ionicity |
Mix of nonionic and anionic |
| 4. pH |
4.0 (2% emulsion fluid) |
| 5. Specific gravity |
1.0 (15) |
| 6. Melting point |
3.6 |
| 7. Packaging |
18kg can |
| 8. Handling |
Avoid contact with eyes, skin and clothing. Wear suitable protective equipment during operations. |
2-1-3. Kayadecolor KP-LV
Characteristics
Agent for dispersion and prevention of redeposition in decoloration
| • |
Kayadecolor KP-LV is an agent for dispersion and prevention of redeposition during the decoloration of polyester or CDP dyed with disperse or cationic dyestuffs. |
Quality specifications
The quality specifications for Kayadecolor KP-LV are shown in the table below.
Kayadecolor KP-LV: Quality specifications
| 1.Appearance |
Pale yellow liquid |
| 2.Components |
Mix of special nonionic and cationic surfactants |
| 3.Ionicity |
Mix of nonionic and anionic |
| 4.Solubility |
Dissolves readily in water at room temperature |
| 5 Packaging |
18kg can |
| 6.Handling |
Avoid contact with eyes, skin and clothing. Wear suitable protective equipment during operations. |
2-1-4. Kayadecolor KP-CH
Characteristics
Agent for dispersion and prevention of scum during decoloration
| • |
Kayadecolor KP-CH prevents the formation of scum during the decoloration of polyester and CDP dyed with disperse or cationic dyestuffs. This agent is capable of producing a good hand while evenly
decoloring the treated material. |
Quality specifications
The quality specifications for Kayadecolor KP-CH are shown in the table below.
Kayadecolor KR-CH: Quality specifications
| 1. Appearance |
Transparent pale yellow liquid |
| 2. Components |
Mix of special high polymer anionic surfactants |
| 3. Ionicity |
Anionic |
| 4. pH |
Approx. 10 (1% solution) |
| 5. Solubility |
Dissolves readily in water at room temperature |
| 6. Packaging |
18kg can |
| 7. Handling |
Avoid contact with eyes, skin and clothing. Wear suitable protective equipment during operations. |
2-1-5. Kayadecolor KP-SP
Characteristics
Auxiliary for oxidative decoloration
| • |
Kayadecolor KP-SP is an auxiliary for the decoloration of polyester and CDP dyed with cationic or disperse dyestuffs, effectively releasing dyestuff that is diffused inside dyed fibers. |
| • |
Can achieve a high level of whiteness. |
| • |
Prevents corrosion of machinery. |
| • |
Practically no production of chlorine gas, and thus easily used in operations. |
| • |
Does not weaken the cloth. |
Quality specifications
The quality specifications for Kayadecolor KP-SP are shown in the table below.
Kayadecolor KR-SP: Quality specifications
| 1. Appearance |
Transparent liquid |
| 2.Components |
Mix of oxidizing agents |
| 3. Ionicity |
Anionic |
| 4. pH |
Approx. 9.0 (1% aqueous solution) |
| 5. Specific gravity |
1.24 (15) |
| 6. Packaging |
20kg can |
| 7. Handling |
Avoid contact with eyes, skin and clothing. Wear suitable protective equipment during operations. |
2-1-6. Colorfastness to light of redyed cloth after decoloration
Problems with colorfastness to light do not exist for redyed cloth. However, since there is a tendency towards inferior colorfastness to light if decoloration is not conducted thoroughly, it is recommended
that oxidative decoloration be conducted after reductive decoloration.
The colorfastness to light of dyed polyester that is redyed after decoloration is shown in the following figure.
(Click for enlargement)
The colorfastness to light of dyed CDP that is redyed after decoloration is shown in the following figure.
(Click for enlargement)
2-1-7. Tear strength of redyed cloth
Dyed polyester and CDP will not weaken as a result of decoloration and redyeing.
Tear strength of redyed cloth (JIS L 1096-1999)
| |
Treated condition
|
Warp |
Weft |
PET 100%
(Tropical cloth)
|
Dyed cloth |
28.3N
(100%)
|
21.9N
(100%) |
| Decolored cloth |
29.1N
(103%) |
19.9N
( 91%) |
| Redyed cloth |
30.4N
(107%) |
23.5N
(107%) |
CDP 100%
(Dacron)
|
Dyed cloth |
23.9N
(100%) |
24.2N
(100%) |
| Decolored cloth |
19.9N
( 83%) |
19.3N
( 80%) |
| Redyed cloth |
19.0N
(80%) |
18.3N
( 76%) |
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