Rotary stretch blow molding apparatus
AssigneeMonsanto Company
InventorsIvan L. Kauffman, Robert C. Kellogg
Life of this patent
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Abstract
A continuous motion stretch blow molding apparatus for blow molding hollow articles from tubular parisons. A rotary parison loading turret loads parisons sequentially onto a plurality of stretch pin means operatively carried on a continuous motion transfer means which then conveys each of said stretch pin means into an operative position in a molding station on a continuous motion multi-station rotary molding turret. The parisons are stretched longitudinally, blown to form a final article, cooled in the molding stations, and then said article is ejected.
Claims11
In a continuous motion stretch blow molding apparatus, for blow molding hollow articles from tubular parisons, the combination comprising:
- A. a continuous motion transfer means;
- B. a plurality of upwardly disposed stretch pin means operatively carried on said transfer means, each stretch pin means including:
- a. a stretch pin body and a stretch pin provided with:
- i. first passage means for conveying blow air into a parison carried on a stretch pin means to blow such parison into the shape of a final article;
- ii. second air ejection passage means for conveying transfer air into said final article carried on such stretch pin means;
- and
- b. valve means operatively associated with the air ejection passage means and responsive to the pressure of the blow air to prevent blow air from exiting through the air ejection passage means during forming of said final article;
- C. a continuous motion rotary parison loading turret for receiving parisons and for sequentially loading them onto said stretch pin means;
- D. a continuous motion rotary molding turret having a plurality of molding stations;
- E. said transfer means being operative to locate each of said stretch pin means with a parison loaded thereon in an individual one of said molding stations for a stretching, blowing and cooling operation on each parison on each stretch pin means to form an article from each parison;
- and
- F. pressurized fluid ejection means successively cooperable with the second air ejection passage means of each stretch pin means to eject each article upwardly from each stretch pin means.
In a continuous motion stretch blow molding apparatus for blowing molding hollow articles from tubular parisons having one open end and one closed end, the combination comprising:
- a. a continuous motion transfer means;
- b. a plurality of upwardly disposed stretch pin means operatively carried on said transfer means;
- c. a continuous motion rotary parison loading turret for receiving preheated parisons and for sequentially loading them onto said stretch pin means;
- d. a continuous motion rotary parison molding turret having a plurality of molding stations;
- e. said transfer means being operative to locate each of said stretch pin means with a parison loaded thereon in an individual one of said molding stations for a stretching, blowing and cooling operation on each parison on each stretch pin means to form an article from each parison;
- f. ejection means operatively positioned between said molding rotary turret and said rotary parison loading turret for ejecting a final article from the stretch pin means;
- g. means between the molding turret and ejection means for maintaining a stretch pin member of each stretch pin means in extended position to aid in holding said final article in substantially vertical position on the stretch pin means substantially until such final article is ejected from the stretch pin means;
- and
- h. means between the ejection means and rotary parison loading turret for moving each stretch pin member of each said stretch pin means to a parison loading position prior to movement of said stretch pin means into operative engagement with the rotary parison loading turret.
in a continuous motion stretch blow molding apparatus for blow molding hollow articles from tubular parisons at orientation temperature having one open end and one closed end, the combination comprising:
- a. a continuous motion parison transfer means;
- b. a plurality of upwardly disposed stretch pin means carrying said open ends of said parisons in a fixed plan of travel and operatively carried on said transfer means, each stretch pin means including a stretch pin mounted for axial movement;
- c. a continuous motion rotary parison loading turret for receiving said parisons and for sequentially loading them onto said stretch pin means;
- d. a continuous motion rotary molding turret having a plurality of molding stations movable through a circular path with said turret, each molding station including:
- i. stretch pin actuator means for axially raising one of said stretch pins to an extended position;
- ii. means for selectively introducing fluid under pressure through said stretch pin means substantially after completion of said raising movement;
- and
- iii. means engaging said stretch pin actuator means for maintaining the stretch pin in extended position during introduction of said fluid into a parison and subsequent cooling of an article blown therefrom as each such station moves along said circular path;
- e. said transfer means being operative to locate each of said stretch pin means with a parison loaded thereon in an individual one of said molding stations;
- f. ejection means operative to eject one of said hollow articles upwardly from each stretch pin means after leaving a molding station;
- g. means concentric with and disposed in fixed position adjacent said rotary molding turret beneath the mold stations to sequentially elevate and lower each of the stretch pin actuator means at preselected positions of a mold station along its rotary path of movement;
- and
- h. means for successively disengaging the means of (d)(iii) before a mold station reaches the position in its rotary path of movement whereat the stretch pin actuator means is lowered.
Dependencies are inferred from the claim text.