About Solvron®


Solvron is a synthetic yarn of Polyvinyl Alcohol (PVA) family, and is produced exclusively by NITIVY CO.,LTD.
Solvron, as the name indicates, is easily dissolvable by plain warm or hot water with no aid of any chemical agents.
Because of its ready solubility, Solvron itself is not usable for ordinary wear apparels. However, taking advantage of its solubility, a number of significant applications for Solvron have been and are being developed and perfected.

Summary of Solvron Yarn


1) For Twistless yarn:

This application offers a softness effect. It is mainly used in natural fiber such as cotton and wool.
The natural fiber is doubled along with Solvron and wound in the reverse direction of the natural fiber.
After dissolving the Solvron, the natural fiber becomes twistless.

2) For Separation:

Solvron is used in applications to separate knitted fabric.
It is used mainly for socks, fishing nets, and narrow knitted tape separation.

3) For Reinforcement:

By covering or twisting ultra-fine yarn/fluffy yarn with Solvron yarn breakage can be prevented and weaving/knitting is made easier.
Solvron acts as a yarn reinforcement.

4) For Shrinkage

Utilizing Shrinkage is mainly used with SHC type for Dampening Cover with offset printing machines.

5) Solvron Sewing Thread:

Tacking thread for sanitary laundry bag, ground cloth, etc.

6) For Ground Cloth in Embroidery

7) For Marking:

Colored Solvron yarn (Red, Blue) is used for marking purposes in all knitted manufacturing processes.
It is mainly used in the manufacture of pantyhose.

8) For Higher Quality of Raschel Lace:

To create fancier Picot/Scallop patterns.

9) For Open work design:

Solvron can be used as a warp and weft support to create open work designs.
The spaces left by the dissolved Solvron will create the desired effect.

10) For Circular Knitting:

・By using circular-double machines it is possible to create a very interesting pile-knit fabric without using a special machine.
Recommended for Sport-Jerseys and Ladies Garments.
・Knitting Solvron to hold other yarns.
Solvron can be used as a holding yarn that will leave gaps and holes as needed in any designs.

Manual for Dissolving

I. Submerge Solvron Directly Into Hot Water:

To ensure quick and even dissolving, first heat water to the desired temperature, and then submerge Solvron directly into the hot water.
If Solvron is placed first in cold water, under tension-free status, and water temperature is raised gradually, Solvron will start shrinking without braking or disintegration. Only when the water reaches the dissolving temperature will the Solvron begin to dissolve away.

II. Sufficient Bath-Ratio/ Stirring, Over-Flowing:

The suitable bath-ratio is 1:30 weightwise. Bath-ratio should be sufficient to facilitate prompt dissolution and also to allow free movement of articles.
If too many articles are put in a limited volume of water dissolving will become difficult.
Stirring of water is essential to promote rapid dissolution.
Continual over-flowing of water is also ideal.

III. Dissolving Time:

Dissolving time greatly depends upon how much and in what status Solvron is used, and therefore it is rather difficult to generalize the dissolving time.
If Solvron is placed in direct contact with hot water, without being covered or wrapped by some insoluble materials, dissolving is easy and instant.
If, however, Solvron is covered or wrapped by insoluble material to the extent of preventing the free flow of hot water, dissolving takes much longer.
Generally speaking, 10-20 minutes of initial boiling, followed by secondary boiling** in fresh hot water will ensure dissolving under normal conditions.

** Secondary Boiling and Rinsing:
Solvron does dissolve in hot water, but it does not evaporate away like a gas.
Solvron, before dissolving, will transform into a glue-like solution of PVA, which promptly dissolves away into hot water if the temperature is hot enough.
Accordingly, re-boiling in fresh hot water is helpful in rinse, washing away PVA residue.
Also, to ensure complete removal of PVA residue, it is important to preferably with warm or hot water.
If PVA residue is left attached to the article, it will stiffen after drying.

IV. Following Factors Influence Dissolution. Dissolving Conditions Must be Set Considering These Factors:

  1. a. Dissolving temperature may rise depending on the condition of heat-set.
  2. b. Tension added at the dissolving process is inclined to make to dissolution harder.
  3. c. By twisting, flow-in-and-out of hot water takes more time which requires higher treatment temperature and/or longer treatment time.
  4. d. Solvron is not influenced by most chemicals but the following chemicals may impede dissolution:
    Salts like sodium sulfate, sodium chloride, alkali like caustic soda(sodium hydroxide), heavy metal like chromium, formalin, reactive dyestuff, etc.