[0001] Centers made of injection-molded synthetic resin for forming cores for the winding
of yarn packages for handling in the textile industry, have been in use for some time
now. At the end of the work cycle, these centers may be recovered or may be destroyed
and are frequently recycled as recycled material to be used in the injection molding
of further centers; recycling by molding offers the advantage of ensuring the service-ability
of the new centers, as contrasted with the use of used centers which may become deformed.
[0002] The centers are almost always shaped differently at their two ends, for a variety
of reasons; the packages must be formed on correctly oriented centers, and the formed
packages must be placed - for later handling - in a specific orientation, which it
is not easy to judge from the ends of the support which barely project from the mass
of yarn forming the package.
[0003] The invention relates to a center made to facilitate the perception of the orientation
of the center, by the ends barely projecting from the center, which operation may
be carried out either by eye or by an automated system.
[0004] The yarn package center - for handling purposes in spinning, package winding, twisting,
dyeing, weaving and the like - made of injection-molded synthetic resin, is molded
according to the invention from plastic material of two colors, resulting in one end
of a different color from the opposite end. This achieves the object of facilitating,
and of checking, the orientation of the center and hence of the yarn package from
which its two ends slightly project. The center may be checked easily by eye or by
a chromatic sensor, owing to the color difference which is produced in the center
according to the invention.
[0005] Where the center is of disposable type or is designed for once-only use with the
material being reused after being ground down, it advantageously is made mostly of
a dark material, in particular black, and of a material of contrasting color limited
to a terminal portion and to the associated end. By this means the material recovered
by the grinding and plasticizing of centers shaped in this way can be used directly
as injectable material for forming the preponderant dark-colored portion of the new
molded centers, with the addition, if necessary, of a colorant or strongly-colored
resin.
[0006] The drawing shows a possible embodiment of the invention, and shows in particular
a center of a conventional type in an external, partially sectioned view.
[0007] The accompanying drawing shows the center, which is indicated as a whole by 1, with
a top end 1A and a bottom end 1B which differ slightly in shape and project slightly
from the mass M of the yarn package which is cross wound onto said center. The two
ends 1A and 1B project very slightly from said mass and therefore are already necessarily
almost out of sight, and their shapes and sizes are quite difficult to tell apart,
especially by eye. This makes it difficult to judge package orientation, which must
be decided when the packages are being mounted on the various appliances for the handling
and processing of the yarn gathered in package form on the center. Selection of the
orientation may be entrusted to the operator or may be automated.
[0008] According to the invention, and as indicated already, the center 1 is to be made
from two different colors of synthetic resin, which are indicated by 1X and 1Y. These
colors are injected by methods which may be readily envisioned to obtain the support
as a single piece formed from said two materials, which are more or less evenly separated
along a line of separation indicated in the drawing by 1Z. The preponderant material,
as regards quantity, which is shown in the drawing by 1X, advantageously is very dark
or even black, while the material present in lesser quantity, shown in the drawing
by 1Y, is of a more or less vivid color that is distinctly lighter than the color
1X, to provide very clear chromatic discrimination between the two ends 1A and 1B.
Alternatively, in order to use as little as possible of the light-colored material,
it is possible to inject this light-colored material into that end which is smallest
in cross section and in dimensions, which in certain cases may be the end 1A rather
than the end 1B of said center; in this case the appearance of the material 1X and
material 1Y of the center would be the reverse of that illustrated in the drawing.
[0009] Very dark synthetic resin is used for the major amount rather than the light-colored
resin because it is advantageous to be able to use the material recovered by grinding
down centers that have already served as single-use centers in order to form the starting
material for the molding of new, similar centers. The low presence of light-colored
material, as at 1Y, as opposed to the preponderant presence of very dark material,
as at 1X, in the ground material allows the recovered material to be used as the material
for the formation of the preponderant dark-colored part, with the addition, if necessary,
of colorants and/or new and very dark resin.
[0010] The aforegoing achieves the advantages already indicated of ease of discrimination
between the positions of the ends 1A and 1B of the centre owing to their chromatic
differentiation, which may also be indicated automatically by a suitable chromatic
sensor.
1. A yarn package center for handling purposes in spinning, package winding, twisting,
dyeing, weaving and the like, made of injection-molded synthetic resin, said center
being molded from plastic material of two colors, resulting in one end of a different
color from the opposite end, in order to facilitate, and to check, the orientation
of the center and hence of the yarn package from which its two ends slightly project.
2. The yarn package centre as claimed in the preceding claim, of disposable type with
the material being reused after being ground down, which center is made mostly of
a dark material, in particular black, and of a material of contrasting color limited
to a terminal portion and to the associated end.
3. Two-color yarn package center for spinning, package winding, twisting, dyeing and
other machines; the whole as described and illustrated.