The enclosed figures are described as follows:
Numeral 2-a shows a feeding screw for the material when it is in a liquid state typical of equipment normally used in moving and molding plastic material within specific molds located in front of head 2.
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Upon examination of the enclosed figures it is quite easy to understand the object of the present device and method to make two color pots it by using equipments already in use for other various types of molding operations for single color pots.
Overall, shown here there is an extruder 2 including a feeding hopper (2-d) for uncolored (neutral) plastic granulate and two feeders (2-d1 and 2-d2) used as proportioning devices and mixers which provide a means to color the granular product (2-d) following an exact management system which is programmable both in quantity and time. The mixed product then moves through the screw (2-a) of the extruder 2 where the granulate, colored according to need, enters a liquid state and is propelled by the screw towards the injection nozzle (2-c) and into the mold 3 and 3a in the sequence and timed to provide the two desired colors.
Flower and plant pots are injected today using this method but the results are very different form those obtained in the presently described manufacturing method. Two-color containers are commonly obtained streaked along injection direction colonizing the entire pot. In previous methods the colored areas are not well differentiated as is the object of the present pot molding method, which provides for a well defined separation between the color of the larger lower truncated conical portion of the pot and the raised cylindrical edge of the top portion of the pot.
In order to obtain this separation of coloring two geometric characteristics of conical pot the flat ring area, formed between in the engaged mold halves 3 and 3-a shown by the planar annular areas 3-b and 3-ba operate to yield great proportioning precision of the colors on each side of the planar areas 3-b and 3-ba over conventionally injection molded terra cotta pots it was also possible to reduce, generally speaking, the difference between the two colors within the ring C1 portion, after having well made ring portion C1 with a shiny color and seemingly enameled, and the lower portion not. Also smaller base shows an exchange area of coloring because also here injection is going to be prepared for next coming ring or cylindrical belt C1 of a subsequently molded pot.
On the smaller base (flat bottom support portion) of truncated cone pot, coloring is not important, since it cannot be viewed when used as a pot for a plant. As a result, any excess injection material from the truncated cone portion of a prior molded pot, is mixed with incoming shiny material or alternately colored injection material for the ring C1-Cn on a subsequent molded pot, before the coloring is carried out between cone and next coming shiny ring C1-Cn which is enamalized or colonized differently than the truncated portion of the next pot. As can be readily seen, by exact timing of the screw (2a) moving the proper amount of mixture of materials for each single pot, from the two feeders (2d1 and 2-d2), and the timing of that volume and mixture delivered by the screw (2a) to the mold, the mixed material can be injection molded first in one color or shiny finish to the ring C1-Cn, and subsequently to form the truncated sidewall M1-Mn in the second color of finish. Any remaining material from the injector 2 that carries sidewall material and new incoming ring C1-Cn material, is deposited to form the bottom wall of the pot prior to the next subsequent pot being molded. The pots, as well shown in drawing of
As depicted in Figure the various and numerous shapes that can be made all with various cylindrical belts or rings C1, C2, . . . Cn, well colored which can resemble terra cotta flower pots with enameled edges or different colors.
We need now to point out that the shape and dimension of the area formed in molds 3 and 3a, in order to better allow change of color at the intersection of 3-ba and 3b, does not much differ from that of terra cotta pots and in any case it is not of a different shape from usual stocking areas for piling up usual terra cotta or plastic pots (black or brown).
Finally, we want to point out that dimensional changes both of belt C1-Cn and of truncated cone M1-Mn do not change various items here described in relation to present invention.
Number | Date | Country | Kind |
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PT 2006 U 000018 | Jul 2006 | IT | national |