Machine stretch blow molding.

Hydraulic press has T-shaped body with sections containing pressure, control and support pistons

The press, e.g. for opening and closing the jaws of a drawing-blowing mould, consists of a T-shaped body (9) with three branches, a first branch (10) containing a pressure piston (17), a second (11) with the control piston (40) actuating the pressure piston by a fluid contained in a chamber (26), and a third branch (12) containing a piston (70) actuated by pressure fluid. The chamber (26) is located between the three pistons and can be divided by a valve (44) into two partial chambers (21, 42) so that the control piston moves the pressure piston when the valve is open and the third piston acts on the pressure piston when the valve is closed.

Forming container perform made from at least materials using same injector to supply each material successively

Forming a perform from at least two materials by using a single injector to introduce them successively into a mould so the first material contacts the mould surface, then the second material contacts the first material and then the injector is closed. The injector has separate conduits for each material and a member sliding in a central bore. The member has successive positions for admitting the first material, second material and closing the injector. Independent claims are included for the following: (a) Apparatus for performing the above method. (b) A perform produced by the above method. Preferred Features: The front end of the member is concave and, when the injector is closed, it shapes the end of the perform. The amount of both materials supplied by the injector compensates for their cooling during the injection process.

Machine for the manufacture of plastic container.

Blow-molding plant module, includes preform-followers reaching into molds to guide and complete expanding preform, operating in conjunction with special holder which maintains sterility inside colder neck

In this plant module, preforms arriving are blown to containers. In the blow-molding unit (12), preform-followers (79) reach into the mold cavity (46), traveling together with preform and mold. Each follower has a rest (81) contacting the external surface of the preform and/or container during formation. This accompanies and guides the preform during its blowing and formation. Preferred features: The rest (81) is at the low end of a rod (80) sliding in the upper part of the mold (45), and is designed for contact with the preform. An actuator (82) cylinder (83) controls rod movement directly. In a development, the rod carries a separate rest component which is retracted, ultimately reaching a position (90) where it forms part of the mold surface in an enlarged recess (not shown) in the mold wall. The rest rod includes a hollow section, in which pressure can be reduced, to hold the end of the preform during blowing and guidance. The rest is perforated. The central bore (29) of the preform ...

Heating device for plastic processing machines.

Machines for the manufacture of plastic containers.