Mould stage

An an alternative to printing the bottles or to affixing labels subsequently it is possible to apply the label at the moulding stage. Paper or thermoplastic film labels are printed in advance and are placed in the moulds before parisons are collected, being held in position by vacuum adhesion of the label takes place when the blown material fills the mould. 

Of eqnal importance to the properties of the moulded component is the influence of the filler during the mixing and moulding stages. Ease of incorporation in the rubber is important if a homogeneous mixture is to be produced. The more fine the filler, the more difficult it is to disperse. 

Figure 4.24. Kinetics of transfer of a diffusing substance in the liquid food of finite volume such as a = 55.3, with various values of the dimensionless number R. The initial profile of concentration of the diffusing substance is that attained at the end of the co-moulding stage described in Figure 3.30 for the three-layer bottle. Dimensionless numbers are used for the co-ordinates.

Figure 6.20 Transfer moulding Stage 1 Material transferred to cavity, tool closed...

Figure 6.21 Transfer moulding Stage 2 Material compressed to...

A variety of properties can be attained. Blending is usually done by the resin supplier, but additional blending can also be done at the moulding stage if convenient. Processability, flame retardancy, control of shrinkage and pigmentation are the principal reasons for using fillers. A brief description of the principal fillers follows ... 

In order to study the natural layout of the fibers in the mass of the concrete it is necessary to make sufficiently large specimens to avoid the surface influence of the mould. Blocks (dimensions 32 x 32 x 40 cm), were moulded on a flow table, the first series was filled in three times, followed each time by ten successive drops. The second series was filled in ten times, followed each time by ten drops.The quantity of energie received during moulding stage is much higher for series n 2. The specimens were cured in the open air till the testing date. 

When calculating structures it will be important to take into account, especially in multiaxial stress zones, the anisotropic characteristics confered to the material during the moulding stage. 

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