The influences of the stitch density of pile yarn upon the thermal retaining property of blankets were studied by using the knitted blanket (the Mayer blanket) and the tufted blanket.
The results are as follows :
(1) In general, the heat transfers mainly due to heat conduction at the pile yarn density of commercial Mayer blankets.
(2) A tufted blanket shows the maximum thermal retention at 28 stitches/5cm. The heat tends to transfer due to heat convection at less than 28 stitches/5 cm. By contrast, the heat tends to transfer due to conduction at more than 28 stitches/5cm.
(3) To improve the thermal retention of the blanket, a Mayer blanket is desired to be produced in more loose course density than that of commercial blanket. A tufted blanket is desired to be produced in higher stitch density than that of commercial tufted blanket.

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The amount of visual illusion of the test pattern has been estimated by comparison between the test pattern width and control one, where the comparison pattern has constant figure. Various test patterns have been examined under the constant test condition. The results are as follows:
When a checkered pattern of the back ground is coarse, the amount of visual illusion is small. The amount of visual illusion is slightly larger when the back ground swings. The amount of visual illusion on the black back ground is slightly larger than that on the white back ground. There is no significant difference between narrow stripe and wide one. Black pattern is judged to be the most narrow of all, and then white pattern is judged to be slightly wider. The pattern with horizontal stripes was judged to be more narrow than one with vertical stripes. Long pattern is judged to be the widest of all.
Repeat of experiment, size of back ground and other experimental conditions have no influence on illusion.

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