What Cause Board Book Warping And Deforming?

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What Cause Board Book Warping And Deforming?
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• Board book warping and deforming is a common
  technical problem encountered by board book
  printers.

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• Board books include hardcover books with gray
  boards as bookcases and books mounted with
  cardboard with a weight of 200-250 grams per
  square meter. They are very common in book
  printing companies and are prone to quality
  problems such as warping and deforming.

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What cause board book warping and deforming?

• 1.Raw materials
• The structure of the gray board or cardboard
  itself determines that it is easier to warp and
  deform during board book printing. Gray board or
  cardboard has high density and long fibers, and
  its water absorption has a great influence on the
  structure of board books.
• When absorbing water, the fibers of the gray
  board or cardboard will stretch, due to gray
  board or cardboard has a certain thickness, the
  amount of water absorbed on both sides will be
  inconsistent, resulting in different elongation
  lengths of the fibers of the gray board or
  cardboard, which makes gray board or cardboard
  deforming.
• At the same time, when water is lost, the fibers
  of the gray board or cardboard will shrink, but
  the inconsistent water loss on both sides will
  cause the fibers to shrink inconsistently,
  resulting in deformation.
• Although the gray board or cardboard will deform
  due to water absorption and water loss, the
  deformation caused by water loss is more serious
  than water absorption. In addition, different
  brands and types of gray board or cardboard have
  different water absorption and deformation extent
  in custom board book printing.

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• 2. Ambient temperature and humidity
• The environmental temperature and humidity have a
  great influence on the printing board books. When
  the ambient temperature and humidity are lower
  than the water content of the cardboard, it will
  cause the cardboard to lose water, and the degree
  of water loss in each part of the cardboard is
  generally different, resulting in warping and
  deformation of the cardboard.
• When the ambient temperature and humidity are
  higher than the water content of the cardboard,
  it will cause the cardboard to absorb water,
  which will also cause the cardboard to warp and
  deform.
• The degree of deformation in these two cases are
  different. The deformation when water is lost is
  much greater than that when water is absorbed, so
  the warping deformation of board books always
  occurs in the dry seasons of autumn and winter.

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• 3. Production process
• When print a board book, it is necessary to cover
  or mount with white latex. The white latex
  contains a lot of water. When the shell is placed
  or mounted, a large amount of water will enter in
  the cardboard, but the water does not enter
  uniformly, which leads to inconsistent moisture
  content in each part of the cardboard, finally
  leads to the board books warping and deforming.

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• 4. Production method
• When custom board book, some companies use
  machines to automatically load them, and some
  companies are artificial shell. Automatic
  shelling by machines is generally more uniform
  than the adhesive applied by artificial shell, so
  that the moisture content of the cardboard is
  more uniform.
• At the same time, the viscosity of the adhesive
  used for automatic shelling by machine is
  different from that of the adhesive used for
  manual shelling, that is, the solid content of
  the adhesive is different. The solid content of
  the adhesive should be high, and the water
  content should be small, and it is less likely to
  cause board book warping and deforming.

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• 5. Process design
• Whether it is gray board or cardboard, all have
  textures, so when the board book is shelled or
  mounted, it needs to be carried out according to
  the texture. A lot of production experience tells
  us that for custom board books, it is necessary
  to cover the casing along the grain for the
  mounted book, it needs to be mounted along the
  grain. If it does not follow the grain, the
  finished cardboard book will have serious warping
  deformation in the later stage.
• In short,raw materials,ambient temperature and
  humidity, production process, production method
  ,process design,these five aspects,which are the
  mainly factors to cause the board book warping
  and deforming.In next article,we will focus on
  how to solve board book warping and deforming.