Lay-flat book production

1. A lay-flat book block production apparatus comprising:

a glue dispenser to transition between an active state in which glue is provided to one side of a web that is guided past the glue dispenser, and an inactive state in which glue is not provided to the web that is guided past the glue dispenser; and

a folding unit to fold the web, wherein each of a plurality of flat portions of a side of the folded web faces another of the plurality of flat portions of a same side, and wherein the folding unit includes a roller pair to guide the web and provide the web with a plurality of crease lines and a plurality of perforation lines, wherein:

a first roller of the roller pair includes at least one longitudinally extending, radially protruding portion to dive into at least one corresponding longitudinally extending notch of a second roller of the roller pair to crease the web, wherein the at least one corresponding longitudinally extending notch forces the web to sharply bend around the at least one longitudinally extending, radially protruding portion, and

the second roller of the roller pair includes at least one longitudinally extending line of radially protruding pins to dive into at least one longitudinally extending line of recesses of the first roller of the roller pair to perforate the web.

2. The lay-flat book block production apparatus according to claim 1 , wherein the folding unit is to fold the web along the plurality of perforation lines.

3. The lay-flat book block production apparatus according to claim 1 , wherein the folding unit arranges the folded web in a pile of flat web portions.

4. The lay-flat book block production apparatus according to claim 3 , wherein the folding unit further arranges the plurality of crease lines at one side of the pile of flat web portions.

5. A method of producing lay-flat book blocks, comprising:

guiding a web along a roller pair of a folding unit;

providing the web with a plurality of crease lines and a plurality of perforation lines, including:

creasing the web by diving at least one longitudinally extending, radially protruding portion of a first roller of the roller pair into at least one corresponding longitudinally extending notch of a second roller of the roller pair; and

perforating the web by diving at least one longitudinally extending line of radially protruding pins of the second roller of the roller pair into at least one longitudinally extending line of recesses of the first roller of the roller pair;

applying glue to at least a portion of one side of a web, including transitioning between an active state in which glue is provided to one side of the web that is guided past a glue dispenser, and an inactive state in which glue is not provided to the one side of the web that is guided past the glue dispenser;

folding the web along a plurality of crease lines and the plurality of perforation lines using the folding unit; and

gluing each of a plurality of flat portions of the one side of the folded web to one of a plurality of other flat portions of the one side.

6. The method according to claim 5 , wherein glue is not provided to at least two flat portions of the one side of the folded web that face each other.

7. The method according to claim 6 , further comprising separating the at least two flat portions of the one side of the web that face each other and to which glue has not been applied.

8. The method according to claim 5 , wherein the folding comprises arranging the folded web in a pile of flat web portions.

9. The method according to claim 8 , wherein folding comprises arranging the plurality of crease lines at one side of the pile of flat web portions.

10. The method according to claim 9 , further comprising cutting away a portion of a side of the pile that is opposite to the one side of the pile at which the crease lines are arranged.