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Apparatus for shaping a tubular preform into a hollow body
| Details |
Inventors: Torsten, Nilsson;
Assignee: Petainer S.A. (Neuchatel, CH)
Primary Examiner: Woo; Jay H.
Assistant Examiner: Mackey; James P.
Attorney, Agent or Firm: Ladas & Parry
Apparatus for shaping a tubular preform into a hollow body in which an axially directed wall of the preform primarily comprises oriented and/or crystallized plastic material. The tubular preform (10d) is fixed in a circumferential region (13d) in the vicinity of the mouth edge (14d) of the preform between mechanical forming devices (30,40), after which the devices, during continued clamping of the circumferential region, are displaced in the axial direction of the preform relative to a mandrel (50). Thus, the mandrel is displaced into the preform during simultaneous expansion thereof and the material is oriented and/or crystallized. In a preferred embodiment, there is compensation of the stretching forces, which arise in the material when inserting the mandrel, by applying a force to the bottom of the preform by a bottom support (75). |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS FIG.
1 shows a preform 10 with a bottom section 11, a mouth 12, a ribbon-shaped, circumferential mouth edge region 13, a mouth edge 14, and an axially directed wall 15, located between the mouth and the bottom section.
The central axis of the preform is denoted by reference numeral 16.
The preform is, in FIG.
2, placed in an apparatus for temperature setting of the preform material.
The apparatus includes a sleeve 91, a mandrel 92 and a bottom support 93.
All these devices are provided with channels 97 through which a fluid, such as a liquid passes for individual setting of each device to a certain working temperature.
The devices are adjustable to positions where there is formed between them a cavity whose shape substantially corresponds to that of the preform.
A preform which is placed in the cavity is thus enclosed on both the inside and the outside by the devices and assumes a temperature which in every part of the preform is determined by the temperatures of the adjoining devices and the time the preform stays in the cavity.
FIGS.
3 and 4 show a basic apparatus for reduction of the material thickness of the preform during its simultaneous extension in the axial direction.
The apparatus includes a bottom support 94, a mandrel 95 and a traction device 96 which surrounds the mandrel and is displaced in its axial direction by displacement devices (not shown in the Figures).
Between the mandrel and the traction device there is defined a slot 90 the breadth of which is less than the material thickness of the axially directed wall of the preform.
The traction devices and/or the mandrel as well as the bottom support are, as a rule, provided with channels 98 through which fluid, such as a liquid passes for regulation of the temperature of the devices.
Depending on the application, heat is either supplied or removed by means of the liquid.
There is a preform 10a,b located in the apparatus, and its wall 15a,b, has undergone an axial stretching (extension) and associated crystallization
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