通过加热而封密封在织物里面的衬背。见胶粘。

Backing that is sealed to the fabric by heat. See Bonding.

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圆背书上壳前要在自制的圆背工具上对中缝预热成型，方便其与书背吻合，并使书背与书封壳中间吻合一致。

Before the round endorsement on the shell to home-made round back on to the nucleus Raphe Magnus, facilitate its warm up and back, and make the back and middle neurorrhaphy book sealed shell.

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包装的款式多样化，背封、插角、连袋、冲孔等。

Packing type diversification, pillow sealing, standing type, punching etc.

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