Abstract: The preform is formed by an upper neck which maintains unchanged its form in the final object and a hollow body, joined to the neck. The method foresees the insertion, within a matrix cavity, of a metered body of polymeric material whose mass is metered according to a reference value, and the subsequent pressure insertion of a punch within the matrix cavity until it closes the mold's molding chamber, the punch conferring the shape to the inner surface of the preform and the matrix having an inner surface which confers the shape to the outer surface of the preform. According to the invention, in the molding of the preform, the error of the mass of the metered body with respect to the reference value is distributed in the hollow body, which undergoes a subsequent hot deformation until it achieves the final shape.

Abstract: A method for creating a seal gasket in the closure cap of a container starting from a cap formed separately, characterised by comprising the following operations: inserting into a cap (1, 10, 100) a first portion (3, 30, 300) of material in the plastic state having barrier properties against O2, CO2, or other gases; inserting a first die (4, 40, 400) to subject said first portion of material to compression in order to form on the base of the cap a first layer (5, 50, 500) of material having barrier properties against said gases; inserting into the cap onto said first layer a second portion (6, 60, 600) of material in the plastic state having hydraulic sealing properties; and inserting a second die (7, 70, 700) to subject said second portion of material to compression in order to form on said first layer a second layer (8, 80, 800) with hydraulic sealing properties.

Abstract: The mold comprises a matrix (30) and a punch (20) adapted to penetrate into the cavity of the matrix to determine the molding chamber of the mold, the object being formed through the pressure insertion of the punch (20) within the cavity of the matrix (30) where a metered body (8) of polymeric material has been previously placed whose mass is metered according to a reference value. According to the invention, the matrix (30) comprises at least one deformable wall (31) whose inner surface defines at least part of the surface of the matrix (30), said deformable wall (31) having, at least in part, a relatively thin thickness which permits it to be elastically deformed under the pressure of the polymeric material in the final molding step of the object, thereby absorbing the error of the mass of the metered body (8) with respect to the reference value.

Abstract: The unit operates by coupling together under pressure a punch (11) and a die with its closed cavity loaded with a charge of polymer material, the charge being produced outside the die and then inserted into the die cavity. The unit comprises a mould having a lower die part arranged to form the lower part of the outer surface of the article, the inner surface (30a) of which comprises a lower end portion and an axially extending lateral portion. The lower die part (30) comprises a first constituent member (31) and a second constituent member (32) having inner surfaces (33, 34) which can be complementarily aligned to together define the inner surface (30a) of the lower die part (30); the inner surface (34) of the second constituent member (32) defines totally or to a large extent said lower end portion of the inner surface of the lower die part (30).

Abstract: An apparatus comprises: forming means movable along a first path for compression moulding doses of plastics; a plurality of transfer means for transferring said doses to said forming means; a plurality of arm means, each arm means being associated with a corresponding transfer means for moving said transfer means along a second path having a portion substantially coinciding with a further portion of said first path.

Abstract: The plant comprises a plurality of shuttles (10) each carrying at least one die part (110), the shuttles being conveyed in a moulding apparatus (20) which is provided with a plurality of punches and a corresponding plurality of seats (21) for holding the shuttles (10), the seats arranged to receive and release the shuttles (10),the moulding apparatus comprising means for inserting the punches into the die cavities (11, 12) of the shuttle and means for withdrawing the punches to achieve a compression moulding cycle for the article. The shuttles (10) are independent of the moulding apparatus. Each shuttles (10)comprises at least one circuit (15) for at least one conditioning fluid for controlling the temperature of the article located in the die, the moulding apparatus (20) comprising at least one feed system (25) for at least one conditioning fluid to feed the conditioning fluid to the shuttles (10) inserted in the seats (21) of the moulding apparatus (20).

Abstract: Machine for forming caps by compression molding comprising: a first carousel rotating about a central axis and provided peripherally with a plurality of compression molding units mounted equidistant from each other and from the axis of rotation, said units comprising an upper punch and a lower die provided with a cavity, said punch and die being mutually movable along a common vertical axis in response to suitable operating means; a second carousel rotating about a central axis parallel to that of the first carousel and provided peripherally with means for feeding the charge of material to be molded to the die cavities of the first carousel, and means for collecting the molded caps abandoned by the punches of the first carousel; means for feeding charges of material to be molded to said second carousel; a possible third carousel provided peripherally with means for guiding and conveying the caps abandoned by the second carousel; said first and second carousel and said second and possible third carousel having

Abstract: The apparatus serves for compression moulding performs (9) for synthetic resin containers by inserting under pressure a mould punch (15) into a die cavity (20a) loaded with a charge (8), the preforms (9) comprising an upper neck (91) provided with projections and a hollow body (92) lying below the neck (91). The apparatus comprises a plurality of first die components (21), each arranged to form the outer surface of the hollow body (92) of the perform (9), and being operated by inserting said punch (15) underpressure into each of them, to compression mould the perform (9). An equal plurality of second die components (22) are provided, each arranged to form the outer surface of the neck (91), each being associated with and secured to the first die component (21), said second component (22) being divided into at least two sectors (23) to be drawn apart to extract the preform (9).

Abstract: A method for separating a portion of extruded material from the continuous strip leaving an extruder, consisting of passing in front of the extrusion nozzle withdrawal means associated with at least one cutting means; said withdrawal means and said at least one cutting means are made to move independently of each other with velocities, in the sense of vectors, which differ from each other and differ in relation to the material portion separated.

Abstract: Machine for forming caps by compression molding comprising: a first carousel rotating about a central axis and provided peripherally with a plurality of compression molding units mounted equidistant from each other and from the axis of rotation, said units comprising an upper punch and a lower die provided with a cavity, said punch and die being mutually movable along a common vertical axis in response to suitable operating means; a second carousel rotating about a central axis parallel to that of the first carousel and provided peripherally with means for feeding the charge of material to be molded to the die cavities of the first carousel, and means for collecting the molded caps abandoned by the punches of the first carousel; means for feeding charges of material to be molded to said second carousel; a possible third carousel provided peripherally with means for guiding and conveying the caps abandoned by the second carousel; said first and second carousel and said second and possible third carousel having

Abstract: Method for forming articles of synthetic material by compression moulding, comprising the following operative stages: inserting a first measured quantity of synthetic material in the plastic state into the cavity of a mould comprising a punch with which it defines a first forming chamber for said measured quantity; pressing said measured quantity to obtain a first portion of the article; opening the mould and inserting a second measured quantity into said cavity; closing the mould by repositioning the punch relative to said cavity to define a second forming chamber; pressing said second measured quantity and again opening the mould, then extracting said article from the punch.

Abstract: A method for creating a seal gasket in the closure cap of a container starting from a cap formed separately, characterised by comprising the following operations: inserting into a cap (1, 10, 100) a first portion (3, 30, 300) of material in the plastic state having barrier properties against O2, CO2, or other gases; inserting a first die (4, 40, 400) to subject said first portion of material to compression in order to form on the base of the cap a first layer (5, 50, 500) of material having barrier properties against said gases; inserting into the cap onto said first layer a second portion (6, 60, 600) of material in the plastic state having hydraulic sealing properties; and inserting a second die (7, 70, 700) to subject said second portion of material to compression in order to form on said first layer a second layer (8, 80, 800) with hydraulic sealing properties.

Abstract: Method for decorating the top of a compression-molded cap of synthetic material intended to close a container, in which the decoration is positioned on a flat support in the form of a disc which is placed in the cavity of the cap forming mold before the constituent material of the cap is introduced, and is found to be bonded to the top of the cap after its removal from the mold.

Abstract: A plastic screw cap comprising a cylindrical cup provided with an internal thread and with a pilferproof ring which is connected to the rim of the cup by means of a plurality of bridges which form a circular fracture line, the ring having a plurality of internal flaps which are inclined towards the bottom of the cup; the pilferproof ring comprising a cylindrical wall, whose thickness is such that it is substantially flexible in a radial expansion direction, a rim which is connected to the rim of the cup by the bridges, and an opposite rim which is connected to an internal annular bead whose inside diameter is smaller than the inside diameter of the wall and whose thickness is significantly greater than the thickness of the wall, a plurality of flaps protruding from the region connecting the flexible wall and the internal annular bead and having such a thickness as to acquire substantial rigidity with respect to radial stresses.

Abstract: A plastic screw cap includes a cylindrical cup provided with an internal thread and with a tamper-evident ring which is coupled to the rim of the cup by means of a plurality of bridges forming a fracture line; the ring has a collar or expansion for retaining it below an annular raised portion of a container whereto the cap is applied. Incisions are formed on the outside of the tamper-evident ring, the incisions do not cross the entire thickness of the ring and allow an elastic radial expansion of the ring, such as to pass beyond the annular raised portion during the application of the cap to the container.

Abstract: Method for decorating the top of a compression-molded cap of synthetic material intended to close a container, in which the decoration is positioned on a flat support in the form of a disc which is placed in the cavity of the cap forming mold before the constituent material of the cap is introduced, and is found to be bonded to the top of the cap after its removal from the mold.

Abstract: A plastic screw cap of the type composed of a cylindrical cup provided with an internal thread and with a tamper-evident ring attached to the rim of the cup, the ring being provided with a retention collar engaging below an annular ridge of a container whereto the cap is applied, wherein the rim of the cup and the border of the ring, except for at least one angularly arranged portion constituting a connection region, are mutually separated by incisions which run all along the circumference of the tamper-evident ring by cutting through the thickness thereof.

Abstract: A plastic screw cap for closing a container, including a cup composed of a disk-like portion and a cylindrical wall that protrudes from the rim of said disk-like portion and has an internal thread that is adapted to engage a corresponding thread of the container, the cap further comprising an annular lip that protrudes from the disk-like portion concentrically with respect to the cylindrical wall, the annular lip acting as a shoulder for a sealing liner, so that the liner, when the cap has been applied to the container, frontally and externally engages the rim of the mouth of the container.