In board book printing process, die cutting is an
important step related to production quality and production efficiency. Card
book die cutting has special requirements for the process, die cutting will
directly affect the quality of products, must be strictly in accordance with
the process requirements.
The die-cutting process of the board book printing is as follows: mold making or mold �?upper version �?
setting machine pressure �?adjusting rules �?sticking sponge rubber strip �?
pressure cutting, adjusting pressure �?formally cutting and cleaning waste.
Even according to this kind of more standard die-cutting process operation,
after the die-cutting products still have some products will appear the
phenomenon of edge, paper dust, trace line powerless, even burst line, below we
analyze the causes of these problems and solutions.
Paper and blades
The paper that board book uses
has 200~500 g/m2 gray bottom white board paper and white card paper, also have
1~3 thick gray board paper, some paper fiber is longer, density is high, can
not rise hair, dust generally, and some white board paper or gray board paper
fiber is short, density is low, drop powder is serious, die cut paper dust is
many, not only hair but also not easy die cut. For this kind of paper in board book printing, should choose high-quality blade or steel good special-shaped mold.
After die-cutting, press the back knife paper (bottom
template) to determine the exact position of the knife line. Die-cut version on
the computer according to the card page to confirm the location of the knife
line and indentation line, the product has a holistic grasp. Debugging stage
pressure must be light, the bottom template has a clear indentation line. After
adjusting the knife slot, first set a pressure value, pad the paper under the
steel bottom plate, observe whether the knife line at the edge of the knife is
easy to separate after pressure test, disconnect the pressure to do local paper
pad treatment, make the plate die cutter pressure uniform, and gradually
increase the machine pressure.
Suitable pressure, die cutting
edge clean, easy to separate, and die cutting knife is not easy to wear.
Selection and installation of sponge tape
Sponge tape should have enough hardness to press the
paper, so that the die-cutting knife will cut the paper smoothly in board book printing. Different paper should use different hardness sponge rubber strip,
installation position and height should also be scientific, standard material
selection and installation is the basis for improving die cutting quality.
Use of Die Cutter
Some reprint board book,
the size specification does not change, in order to reduce the cost, often uses
the original die-cut edition, but because the old die-cut edition storage time
is too long or the last die-cut quantity is too many, the blade is no longer
sharp, it is difficult to die-cut qualified products, paper dust, edge,
indentation line deformation and other failures are also difficult to avoid. In
view of this situation, the wear of the old die cutter should be checked before
production. If the die cutter has exceeded the specified die cutting amount,
the new knife should be prepared directly to avoid the appearance of defective
products.