Prevention of webbing

Webbing is prevented just by setting on the machine:

– reduce compression speed,

– prevent too fast cooling down of material.

Webbing is prevented by screens in the clambing frame:

– limit forming area, so that geometrical compression conditions will be more favourable, … so that the “initial tent” will be smaller.

Webbing is prevented by design change:

– apply larger radii on the upper side of the mould so that geometrical compression conditions will be more favourable,

– change mould is such a way that webbing looks like purposely implemented reinforcement rib,

– create more surface in the lower section on that the webbing area can be used up.

Webbing is prevented by changing the mould in the waste area:

– build up mould higher so that webbing will form in the waste area ( this is only possible if the coresponding section will be severed),

– tear webs apart.

This can be effected with 2 artificial elevations ( e.g. hemispheres ), one right and left each of the web.

Similarly successful might be a wide recess below the web.

Webbing is prevented by means of the pre-stretching plug:

– according to the basic principle: ” you may press small webs, you have to pull large webs”,

– the pre-streching plug must be propably used in combination with negative moulds, especially for long, negatively formed groove-like recesses.

Webbing is prevented due to heavy sagging:

– if the surface of a heated materil is larger  than the surface of the forming tool, there will be surface webbing. This is the case, when sagging is severe and the mould is flat,

– the solution is to mounth the mould at an increased height so that there will be a larger forming surface ( mould + increased height). It should be at least the size of the material surface generated by sagging.





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