Blow molding apparatus

Claim 2

A blow mold for forming a container having a neck, said blow mold comprising: a. means forming a mold portion having a container forming cavity therein with the mold having portions thereof relatively movable between mold open and closed positions; b. surfaces defining a bore for forming a container neck forming portion of said mold, said bore opening into the cavity of said mold and having a free first end and a second end adjacent said cavity; c. thread forming grooves in said surfaces for forming threads on one end of a container formed in said mold; d. a collar forming groove in said surfaces and positioned between said thread forming grooves and said second end for forming a collar on said container neck; e. a first rib extending outwardly from each of said surfaces into said bore and positioned between said collar forming groove and said thread forming grooves and forming a flow restriction therebetween; and f. a second rib extending outwardly from each of said surfaces into said bore and positioned between said collar forming groove and said second end for restricting movement of container material away from said collar forming groove.

Claim 3

The mold as set forth in claim 1 wherein said means includes: a. two separable mold halves relatively movable between said open and closed positions, said mold halves having portions defining said cavity; and b. jaw portions each cooperating with a respective said mold half and having a said surface thereon, said jaw portions being movable between first and second positions wherein when in said first position said surfaces define said bore.

Claim 4

The mold as set forth in claim 2 wherein: a. said jaw portions being movable independently of said mold halves.

Claim 5

The mold as set forth in claim 2 wherein: a. said first and second ribs having a generally triangular cross section with a first surface partially defining same being generally normal to a longitudinal axis of said bore and facing said first end.

Claim 6

The mold as set forth in claim 4 wherein: a. said first and second ribs having a second surface partially defining extending into said bore from said surfaces and inclined from said surfaces toward said first end to said first surface and having a juncture with a respective said first surface, said juncture being characterized by the absence of a sharp edge.

Claim 7

A blow molding apparatus for forming a container having a neck, said apparatus comprising: a. first and second mold halves positioned in opposed relation and movable between mold open and closed positions; b. means operably connected to a respective said mold half for selectively moving same between said mold open and closed positions; c. neck-forming jaws each positioned adjacent a respective said mold half and movable independently thereof between first and second positions, said jaws being in opposed relation and each having a neck-forming surface wherein when said jaws are in said first position said surfaces are coextensive and define an opening through said jaws, said opening having a free first end and a second end adjacent said mold halves, said jaws having thread-forming grooves in said surfaces for forming threads on a neck portion of a container formed in said mold halves and jaws; d. second means operably connected to said jaws for selectively moving same between said first and second positions; e. a collar-forming groove in each of said surfaces and positioned between said thread-forming grooves and said second end, said seal collar-forming grooves being coextensive when said jaws are in their said first position; f. a first rib extending outwardly from each of said surfaces into said opening and being coextensive when said jaws are in their said first position to form a first annular choke ring positioned between said thread-forming grooves and said collar-forming grooves; and g. a second rib extending outwardly from each of said surfaces into said opening and being coextensive when said jaws are in their said first position to form a second annular choke ring positioned between said collar-forming grooves and said second end, said second ribs restricting flow of material, from which the container is formed, from the neck of said container into a body portion of said container.

Claim 8

A blow molding apparatus for forming a container having a neck, said apparatus comprising: a. first and second mold halves positioned in opposed relation and movable between mold open and closed positions; b. means operably connected to a respective said mold half for selectively moving same between said mold open and closed positions; c. neck-forming jaws each positioned adjacent a respective said mold half and movable independently thereof between first and second positions, said jaws being in opposed relation and each having a neck-forming surface wherein when said jaws are in said first position said surfaces are coextensive and define an opening through said jaws, said opening having a free first end and a second end adjacent said mold halves, said jaws having thread-forming grooves in said surfaces for forming threads on a neck portion of a container formed in said mold halves and jaws; d. second means operably connected to said jaws for selectively moving same between said first and second positions; e. a collar-forming groove in each of said surfaces and positioned between said thread-forming grooves and said second end, said seal collar-forming grooves being coextensive when said jaws are in their said first position; f. a first rib extending outwardly from each of said surfaces into said opening and being coextensive when said jaws are in their said first position to form a first annular choke ring positioned between said thread-forming grooves and said collar-forming grooves; and g. a second rib extending outwardly from each of said surfaces into said opening and being coextensive when said jaws are in their said first position to form a second annular choke ring positioned between said collar-forming grooves and said second end, said second ribs restricting flow of material, from which the container is formed, from the neck of said container into a body portion of said container.

Claim 9

The blow molding apparatus as set forth in claim 6 wherein: a. said first and second ribs have a generally triangular cross section with a first surface partially defining same being generally normal to a longitudinal axis of said opening and facing said first end.

Claim 10

The blow molding apparatus as set forth in claim 7 including: a. means for stretching and orienting a parison from which said container is formed wherein said second annular choke ring restricts flow of material from said container neck area into the container body portion during stretching and blowing of said parison.