Abstract: The invention relates to a rigid or semirigid plastic part designed to form the bottom of a package whose side wall consists of a laminated film. The plastic part has a central axis and includes the following features: a peripheral welding zone designed to contact and be welded to the inside surface of the side wall; a convex inside face and a concave outside face; the inside face and the outside face each comprise a zone whose centre is on the axis and which is designed to contact a tool used to attach the part to the side wall; and a profile at least partially defined by a curve. The invention also relates to a package having a bottom consisting of the plastic part.

Abstract: The invention relates to a device for moulding a plastic article in which the article is obtained by the compression of a quantity of plastic material (3) in the molten state between the two parts of a mould, comprising at least one supply of plastic material (1), a rod (11), sliding in a sleeve (8) suitable for temporarily supporting said quantity of plastic material (3), a mould for the head of the article (6, 7) and a mandrel (18) cooperating with said mould (6, 7), characterized in that it comprises non-elastic retaining means (12-14, 23, 24) which are suitable for limiting the bidirectional displacement of the rod (11) in the sleeve (8). The invention also relates to a method using the aforementioned device.

Abstract: The invention relates to a tube end (2) made of plastic formed in a single piece and made by a moulding method; end comprising a first cylindrical wall (7) comprising a thread (8) on its outer surface and a second, smaller, cylindrical wall (9) placed inside the first cylindrical wall (7), the two cylindrical walls (7, 9) being coaxial, the inner face of the second cylindrical wall (9) comprising a discontinuous thread (10, 11) defined by a series of sectors (10) and interruptions (11). The invention also relates to a device and a method for the manufacture of the tube end.

Abstract: The invention relates to a device for moulding a plastic article in which the article is obtained by the compression of a quantity of plastic material (3) in the molten state between the two parts of a mould, comprising at least one supply of plastic material (1), a rod (11), sliding in a sleeve (8) suitable for temporarily supporting said quantity of plastic material (3), a mould for the head of the article (6, 7) and a mandrel (18) cooperating with said mould (6, 7), characterized in that it comprises non-elastic retaining means (12-14, 23, 24) which are suitable for limiting the bidirectional displacement of the rod (11) in the sleeve (8). The invention also relates to a method using the aforementioned device.

Abstract: The invention relates to a rigid or semirigid plastic part designed to form the bottom (1) of a package whose side wall (2) consists of a laminated film, said part having a central axis (3) and comprising the following features: a. A peripheral welding zone (4) designed to contact and be welded to the inside surface (5) of said side wall (2); b. A convex inside face (6) and a concave outside face (7); c. The inside face (6) and the outside face (7) each comprising a zone (10, 11), whose centre is on said axis (3) and which is designed to contact a tool used to attach the part to said side wall (2); and d. A profile at least partially defined by a curve. The invention also relates to a package having a bottom consisting of a part as defined above.

Abstract: The invention relates to a device for moulding a plastic article in which the article is obtained by the compression of a metered quantity of plastic (3) in the molten state between the two parts of a mould, comprising at least one supply of plastic (1), a rod (11), sliding in a sleeve (8) suitable for temporarily supporting said metered quantity of plastic (3), a mould for the head of the article (6, 7) and a mandrel (18) cooperating with said mould (6, 7), the sleeve (8) having an upper face (16) and a lateral wall (17), the device being characterized in that it includes means for depositing the metered quantity on the sleeve (1, 2), which means are designed so that the amount of plastic (22) lying above a plane (20) coinciding with the upper face (16) of the sleeve (8) is between 20% and 40% of the total mass of the metered quantity (3). The invention also relates to a method using the aforementioned device.

Abstract: The invention relates to a plastic metering system in a device for producing plastic articles, comprising a metering unit (1) forming a block (2) comprising a material feed duct (10), a metering cavity (4) which may communicate with the said material feed duct (10), a material outlet orifice (5) placed on a wall of the said metering cavity (4), and a valve (3) in the form of a cylindrical rod designed to slide through and close off the said material outlet orifice (5), characterized in that the metering unit (1) furthermore includes a piston (7) mounted so as to slide coaxially around the valve (3) so as to allow the volume of the metering cavity (4) to be varied and the material feed duct (10) to be momentarily closed off. The invention also relates to a method for using the said system.

Abstract: The invention relates to a plastic metering system in a device for producing plastic articles, comprising a metering unit (1) forming a block (2) comprising a material feed duct (10), a metering cavity (4) which may communicate with the said material feed duct (10), a material outlet orifice (5) placed on a wall of the said metering cavity (4), and a valve (3) in the form of a cylindrical rod designed to slide through and close off the said material outlet orifice (5), characterized in that the metering unit (1) furthermore includes a piston (7) mounted so as to slide coaxially around the valve (3) so as to allow the volume of the metering cavity (4) to be varied and the material feed duct (10) to be momentarily closed off. The invention also relates to a method for using the said system.

Abstract: In a method for producing a molded plastic article, individual portions of material are removed from a flow of heat-plasticized material which flows vertically downwards from a closable dispensing aperture of a dispenser and are transferred to a mold before being pressed by closure of the mold to form a molded article. The required portions are cut by cutting shears from the flow of material at a point below the dispensing aperture and at a distance from it. A device for the production of the molded plastic article has a closable mold and a material dispenser for heat-plasticized synthetic material which can be arranged above the molding chamber. The dispenser has a dispensing aperture which points towards the mold and can be closed by a closure unit and from which the flow of plasticized material emerges. A shearing device for separating the required portions of material is situated below and at a distance from the dispensing aperture.