摘要:
Method of manufacturing a container from a blank of plastic material, within a mold provided with a wall defining a cavity with the impression of the container, and a mold bottom that is movable with respect to the wall between a retracted position and a deployed position in which it extends protruding into the interior of the cavity in order to form a hollow recess in the container. The method includes inserting the blank into the mold; a pre-blowing operation including injecting a fluid under pressure into the blank, at a pre-blowing pressure; a blowing operation including injecting a fluid under pressure into the blank at a blowing pressure that is greater than the pre-blowing pressure; and a boxing operation, initiated prior to the blowing operation, and including moving the movable mold bottom from its retracted position to its deployed position.
摘要:
Method for producing a vessel (2) by blowing in a mould (11) from a preform (3) made of plastic material, comprising the operations consisting in: introducing the preform (3) into the mould; at a predetermined moment, called pre-blowing cue (tP), controlling the opening of an electrovalve (22) for establishing a communication between the inside of the preform (3) and a source (20) of gas at a predetermined pre-blowing pressure; measuring the pressure (P) inside the preform (3); detecting the so-called real moment (tA), of the beginning of the pre-blowing, at which the (P) in the preform (3) starts to increase; comparing this moment (tA) with a theoretical pre-blowing beginning moment; if the real moment (tA) of the beginning of the pre-blowing follows the theoretical pre-blowing beginning moment, advance the pre-blowing cue (tP); if the real moment (tA) of the beginning of the pre-blowing precedes the theoretical pre-blowing beginning moment, delay the pre-blowing cue (tP).
摘要:
A method for producing a vessel (2), involving: placing a preform (3) into the mold; at the pre-blowing cue (tp), controlling the opening of an electrovalve (22) for establishing communication between the preform (3) and a source (20) of gas at a predetermined pre-blowing pressure (Pp); measuring the pressure (P) inside the preform (3); at the blowing cue (tS), controlling the opening of an electrovalve (26) for establishing a communication between the preform (3) and a source (24) of a gas at a blowing pressure (PS) higher than the pre-blowing pressure (Pp); memorising the variations of the pressure (P) inside the preform (3) at least during the interval between the pre-blowing cue (tp) and the blowing cue (tS); detecting the expansion end moment (tC) from which the pressure in the preform (3) increases in a linear manner; and advancing the blowing cue (tS) according to the expansion end moment (tC).
摘要:
A device (10) for loading containers (12), which are provided with a neck (20), on an transporting element (14) includes a member (28) for individually grasping the container by the neck thereof, wherein the grasping member is used for catching or releasing the neck of a preform by the vertical slide of the preform with respect to the grasping member during an operation for catching or releasing it, the loading device includes elements (42, 68) for selectively ejecting the container from the transporting element during the releasing operation. The elements for ejecting the container are provided with container receiving members (42) which are used for catching the container prior to the releasing operation and are mounted in a horizontally movable manner in such a way that the trajectory of the receiving members are vertically superimposed and synchronized with the trajectory of the grasping device.
摘要:
The invention relates to a device (10) for loading containers (12), which are provided with a neck (20), on an transporting element (14) comprising a member (28) for individually grasping the container (12) by the neck thereof (20), wherein said grasping member (28) is used for catching or releasing the neck (20) of a preform (12) by the vertical slide of said preform (12) with respect to said grasping member (28) during an operation for catching or releasing it, the loading device (10) comprises means (42, 68) for selectively ejecting the container (12) from the transporting element (14) during the releasing operation and the inventive device is characterised in that said means for ejecting the container (12) is provided with container (12) reception means (42) which are used for catching the container (12) prior to the releasing operation and are mounted in a horizontally movable manner in such a way that the trajectory of the receiving means (42) are vertically superimposed and synchronised with the trajectory of the grasping device (28).
摘要:
Method of manufacturing a container (2) by stretch-blow molding in a mold (8) from a blank (3) of plastic material, which comprises the operations consisting of: measuring the pressure prevailing inside the blank (3) during a pre-blowing phase; detecting an instant corresponding to a local minimum pressure in the blank (3); placing in memory the instant at which said minimum pressure occurs as well as the corresponding pressure prevailing in the blank (3); comparing the instant and the pressure of the detected minimum with, respectively, a predetermined instant and pressure of a theoretical minimum pressure; if the measured minimum and the theoretical minimum do not coincide, ordering a modification of at least one of the following parameters: pre-blowing pressure, pre-blowing flow rate, stretching speed, heating temperature.
摘要:
A machine for manufacturing containers from blanks of plastic material, which includes an oven furnished with a plurality of radiation sources for heating blanks as they travel through at a predetermined speed of travel and heating profile, and a programmed control center for modifying the speed of travel and heating profile based on a temperature measurement made on a blank leaving the oven, and a pressure measurement made in the blank during a subsequent blowing.
摘要:
Method for producing a vessel (1) by stretch blow-moulding in a mould (11) from a preform (3) made of plastic material, comprising the operations consisting in heating the preform (3) to a predetermined heating temperature (T); introducing the preform (3) in the mould (11); stretching the preform (3) by means of a rod (16) displaced at a predetermined stretching speed (VE); at a predetermined moment, called pre-blowing cue (tP), controlling the opening of an electrovalve (22) for establishing a communication between the inside of the preform (3) and a source (20) of gas at a predetermined pre-blowing pressure (PP) and a pre-blowing flow rate (DP); measuring the pressure (P) inside the preform (3); detecting a pressure peak; memorising the moment (tB) at which this pressure peak occurs as well as the corresponding pressure (PB) inside the preform (3); comparing the moment (tB) and the pressure (PB) of the peak detected with, respectively, a predetermined moment and pressure for a theoretical pressure peak; if the measured peak and the theoretical peak are not confounded, modify at least one of the following parameters: pre-blowing pressure (PP), pre-blowing flow rate (DP), pre-blowing cue (tP), stretching speed (VE), heating temperature (T).
摘要:
A machine for manufacturing containers from blanks of plastic material, which includes an oven furnished with a plurality of radiation sources for heating blanks as they travel through at a predetermined speed of travel and heating profile, and a programmed control center for modifying the speed of travel and heating profile based on a temperature measurement made on a blank leaving the oven, and a pressure measurement made in the blank during a subsequent blowing.
摘要:
A method for producing a vessel by stretch blow-molding in a mold from a preform made of plastic material includes heating the preform and introducing the preform in the mold. The preform is stretched by a rod displaced at a predetermined stretching speed. At a pre-blowing cue, the electrovalve is opened for establishing a communication between the inside of the preform and a gas source at a predetermined pre-blowing pressure and a pre-blowing flow rate. Pressure inside the preform is measured and a pressure peak is detected. The moment at which this pressure peak occurs and the corresponding pressure inside the preform is stored and compared with a predetermined moment and pressure for a theoretical pressure peak. Depending on the result, at least one of the following are modified: pre-blowing pressure, pre-blowing flow rate, pre-blowing cue, stretching speed, and heating temperature.