板に

into boards

→ 板
phrase Rare #45,252
into boards In 板にする, に marks the result of a change: something is made into boards. In other contexts, 板に can mean “on a board” or “by means of a board.”
JA: 木を切って板にした。
EN: I cut the wood into boards.

ひろしは材木をひいて板にしています。

Hiroshi is sawing lumber into boards.

彼は丸太をのこぎりでひいて板にしている。

He is sawing the log into boards.