spine
Spine or spinal may refer to:
Science Biology
* Vertebral column, also known as the backbone
* Dendritic spine, a small membranous protrusion from a neuron's dendrite
* Thorns, spines, and prickles, needle-like structures in plants
* Spine (zoolo ...
, a front cover, and a back cover.
The spine however includes a steel
spring
Spring(s) may refer to:
Common uses
* Spring (season), a season of the year
* Spring (device), a mechanical device that stores energy
* Spring (hydrology), a natural source of water
* Spring (mathematics), a geometric surface in the shape of a h ...
that serves to hold together the inner book as soon as it is inserted.
When the front and back covers are pushed apart by more than 270 degrees, the spring will open, and the inner book can be inserted, removed or supplemented by individual leaves.
The process takes only a few seconds, and the finished bound book is like a book with hard cover.
Typical
paper size
Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents.
The ISO 216 standard, which includes the commonly used A4 size, is the international standard for paper size. I ...
s are A4 and A5, or their equivalent, the maximum stack height is usually 2 cm.
In contrast to other binding methods, the binder can be reused by simply removing the old inner book block and replacing it by a new one.
This way, the binder can be used for decades for always new content.
Furthermore, no additional devices are required than the binder itself.
Since the inner book is neither glued, nor stitched or stapled, it can still be used as a master for additional copies.
In the
GDR
East Germany, officially the German Democratic Republic (GDR; german: Deutsche Demokratische Republik, , DDR, ), was a country that existed from its creation on 7 October 1949 until German reunification, its dissolution on 3 October 1990. In t ...
, a springback binder in A5 format was part of a first grader's typical equipment.
During the school year, it was filled with exercise sheets that were distributed one by one.
See also
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Loose leaf
A loose leaf is a piece of paper of any kind that is not bound in place, or available on a continuous roll, and may be punched so as to be organized in a ring binder. Loose leaf paper may be sold as free sheets, or made up into notepads, where ...
*
Ring binder
Ring binders (loose leaf binders, looseleaf binders, or sometimes called files in Britain) are large folders that contain file folders or hole punched papers. These binders come in various sizes and can accommodate an array of paper sizes. T ...