摘要:
Inner surface strain of a container is reduced by suppressing a temperature drop of blow air, and heat resistance of the container is increased by enhancing the degree of crystallization. A blow air supply unit for a blow molding machine for molding a hollow bottle container 1 by supplying heated blow air into a preform includes: a high-pressure air source 11 for generating high-pressure blow air; a high-pressure gate valve 12 for opening/closing a blow air channel on the downstream of the high-pressure air source 11; a heat exchanger 13 for heating the blow air on the downstream of the high-pressure gate valve 12; a throttle valve 14 for throttling the flow rate of blow air on the downstream side of the heat exchanger 13; and a switchover valve 15 for switching the blow air on the downstream of the throttle valve 14.
摘要:
Das Verfahren und die Vorrichtung dienen zur Blasformung von Behältern (2). Ein Vorformling (1) aus einem thermoplastischen Material wird zunächst entlang eines Transportweges im Bereich einer Heizstrecke (24) einer thermischen Konditionierung unterworfen. Anschließend wird der Vorformling (1) innerhalb einer Blasform (4) durch Blasdruckeinwirkung in den Behälter umgeformt. Im Bereich der Heizstrecke (24) wird von mindestens einem Heizstrahler (30) einer Heizstrahlung mit einer maximalen Strahlungsintensität bei wellenlängen zwischen 0,4 Mikrometer und 1,0 Mikrometer emittiert.
摘要:
Energy-efficient apparatus for blow moulding articles from thermoplastic material includes a mould 2 defining a mould cavity 3 for receiving a heated thermoplastic parison 4. An air duct 9 connects the mould to a low pressure accumulator 10 containing air at a first moulding pressure for use in a first blowing stage, at least one intermediate accumulator 20, 30, containing air at intermediate pressures for use in intermediate blowing stages, and a high pressure accumulator 40 containing air at a final moulding pressure for use in a final blowing stage. The capacity of each of the accumulators is about ten times greater than the volume of the mould cavity. Valves 11-41 selectively control communication between each of the accumulators and the mould cavity 3 to admit air from each of the accumulators to the mould cavity in sequence during a blowing phase, and thereby expand the parison in a stepwise manner. During a recovery phase, the valves sequentially admit pressurised air from the mould cavity to the intermediate and low pressure accumulators 30-10 in turn to restore the accumulator pressures for the next moulding cycle.
摘要:
Apparatus for blow moulding hollow plastic bodies from plastic preforms, or parisons, which is adapted to detect bursts occurring in plastic bottles. To this purpose, the apparatus itself comprises a differential pressure transducer arrangement (10, 11), a low-pressure gas supply source (103) along with a related first supply channel (101), a high-pressure gas supply source along with a related second supply channel (105). The differential pressure transducer arrangement is made up by one or more tubes (3, 4) arranged crosswise in the second supply channel; these tubes contain respective separate chambers opening (5, 6) into the interior of said second supply channel (Pitot tubes). Two sensors (7, 8) adapted to detect respective pressures are connected in a distinct manner to said respective chambers. Any possible pressure variation at pre-determined moments during the blow-moulding cycle is processed and compared, and the result is an indication of whether a serious irregularity, such as a burst or a silent gas leakage, took place during the blow-moulding process of a given bottle.
摘要:
The invention concerns a method for making plastic tubes, whereby a tube blank (Te) brought to a temperature close to molecular orientation temperature is subjected to a bi-axial drawing, by radial expansion of the tube blank inside a forming shaft (2), with formation of a contraction cavity at one end of the tube, by controlled displacement of this contraction cavity to the other end of the tube, and by longitudinal drawing. The radial expansion is carried out in at least two phases, viz. a first phase during which the tube blank (Te) is inflated to an intermediate diameter (Di) determined by a double-walled envelope (21), introduced into the forming shaft (2), with circulation of a hot fluid between the two walls of the envelope (21), and then the envelope is gradually removed from the forming shaft (2) to enable, during a second phase, the radial expansion of the plastic tube up to an internal diameter of the forming shaft (2), and its longitudinal drawing.
摘要:
La présente invention concerne un procédé de soufflage d'emballage et un dispositif pour la mise en oeuvre dudit procédé. Le procédé est caractérisé par les étapes suivantes:
-) pré-soufflage à une première pression du gaz dans une préforme (1), -) soufflage à une deuxième pression du gaz dans la préforme pour obtenir un emballage (2); -) balayage de l'emballage au moyen d'un gaz à une troisième pression pendant une phase de décharge; -) maintien d'une contre-pression pendant le balayage; -) décharge du gaz résiduel de l'emballage.
摘要:
The invention concerns a device for blowing containers, in particular bottles, from a preform (1) with a gas and recuperating said gas, comprising at least means for supplying the device with gas at a first pressure and at a second pressure, drawing means and container forming means (2). It comprises means for recuperating said gas (6, 7) until a predetermined expansion pressure is reached in the container, means for controlling said recuperating means and adjusting means for adjusting the operating conditions of said control means.
摘要:
Verfahren zum Herstellen von Hohlkörpern (H) aus einem hohlen plastifizierten Vorformling (V) aus thermoplastischem Kunststoff, bei dem der Vorformling (V) in eine Kavität (WK) eines Werkzeuges (W) eingebracht und mittels eines Aufblasmediums von innen aufgeblasen wird, und bei dem mittels eines zweiten in die Kavität (WK) zwischen Vorformling (V) und Wandung (WW) des Werkzeuges (W) eingebrachten Mediums der Vorformling (V) manipuliert wird, dergestalt, daß zur Verlangsamung der Annäherung des Vorformlings (V) an die Wandung (WW) des Werkzeuges (W) das Medium mit Überdruck eingebracht wird und in den Bereichen, denen sich der Vorformling (V) beim Aufblasen zuletzt der Wandung (WW) des Werkzeuges (W) nähert mittels des zweiten Mediums ein Unterdruck zur Beschleunigung der Annäherung erzeugt wird, so daß die Varianz der Wanddicke des erhaltenen Hohlkörpers (H) über seinen Umfang betrachtet verringert wird.
摘要:
There is provided a method of molding a large container including the steps of preparing a preform from an injection-molded, thick-wall closed-end parison by repeatedly and intermittently applying an air blow pressure to the parison and releasing the air blow pressure therefrom, and stretch blow molding the preform to a thin-wall large container. The closed-end parison is released from a mold immediately after a skin layer keeping a parison shape is formed on the surface of the closed-end parison having a high inner temperature, and is then molded to a preform with a preform mold heated to a predetermined temperature, while the surface temperature of the parison is increased by the inner temperature. The preform kept at a stretch blow molding temperature is stretch blow molded into a blow mold to produce a large container.