when used, observation with a thermal imaging camera shows a slight increase in temperature in the area where it is applied. Kita explains, “Ginger is also a stimulant ingredient, so we believe that the warmth is felt by applying it to the skin to promote blood circulation. When applied, it feels as if it warms the body from the inside.”In addition, the plaster contains more than 10% ginger powder (by weight), and the amount of ginger powder in the plaster was also the result of careful consideration, accord-ing to Kita.“Basically, the higher the amount of ginger, the more warmth you feel, but the way you feel it depends great-ly on your age and whether or not you have back pain or other symptoms. I myself felt warmth even without adding 10%, but since the product is sold to osteopathic clinics where people with symptoms go, I added a little more. Also, the hot patch is intended for use in winter. In winter, pores are closed and it is difficult to feel the warmth, so we took that into consideration. The point of mixing a considerable amount of ginger powder without lumps and applying it is our manufacturing know-how.”However, as the amount of powder increases, the plas-ter tends to become harder and the texture of the sheet is compromised. In addition, the layers of the base non-woven fabric and the ointment tend to peel off easily, and the oint-ment can remain on the skin when the hot patch is peeled off, making it difficult to achieve both warmth and texture,” Kita continued.The warmth of the hot patch is said to last approximate-ly 6-7 hours. The company recommends applying it to the body after taking a bath.Additionally, the company sells MEGUREFRE, a conven-tional cold-type sheet for feet that uses natural menthol and 100% essential oils of lavender, grapefruit, bergamot, mar-53Hot Patch with gingerOne of them is “Hot Patch,” a warming sheet containing dried ginger powder. The product uses 100% ginger as the aroma and warming ingredient, and the gingerol contained in ginger is thought to slowly warm the body. Mr. Kita ex-plained how the product was developed as follows.“Our previous adhesive skin patch and sheet products were only cold-sensitive products, and we wanted to add a warm-sensitive type to our products lineup. Our products are mainly sold at orthopedic clinics. There, products that are gentle to the skin using menthol have gained support, and ‘skin-friendliness’ is one of the features of our products. How can we create a warm-sensitive type while respecting this point? Generally, warm compresses are made with in-gredients derived from Capsicum annuum, and we made a prototype using Capsicum annuum ingredients. Since the poultice tingled, we thought about finding an ingredient that would be less stressful to the skin, and we arrived at ginger. It is said that adding ginger to tea warms the body, and this gave us a hint.”“We do not know what actually contributed to the warm sensation, but at present we think it was gingerol. As a re-sult, we were able to take advantage of the plaster-making know-how we had cultivated with the cold-sensitive type, such as kneading into SIS,” says Kita.Although the hot patch itself does not generate heat Challenging to achieve both warmth and textureIn the development stage, samples of ginger powder from a herbal medicine manufacturer and mixed with water or fluid paraffin. However, it alone did not give a feeling of warmth. On the other hand, when mixed with SIS or raw rubber, which were used in the cold type, and coated, Kita felt warmth from the first application.Refreshment sheets for feet using essential oilsHot Patch is sold mainly at osteopathic clinics through trad-ing companies. “When we started selling them, we received mixed reactions. One person who soaked a towel in ginger boiled water and applied it to his body, which is called folk medicine, said, ‘It saves me the trouble of making it, and I can apply it when I go out. Even at natural food stores, it is sold as a sheet product that can be easily applied as an alternative to the traditional method of treatment,” said Yoshida.
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