熨袖板，烫衫板a very small ironing board (= a table for ironing clothes on), used for ironing sleeves, trouser legs, etc.
A sleeve board helps you iron a shirt without making a crease in the sleeve. 用烫衫板熨烫衬衫，袖子不会有皱痕。
Sleeve boards are a great sewing tool and are useful for much more than just pressing sleeves. 烫袖板不止可以烫袖子，还是缝纫的好工具。