One major characteristic that’s useful to understand when it comes to plastic prototype production and/or plastic part manufacturing is the distinction between thermoplastic and thermoset materials. To make a long story short, thermoplastic materials can be melted, cured (cooled down such that they become solid), melted again, cured again, and so forth. There is a limit to the number of times this process can be repeated depending on the particulars of the given material but the point is that thermoplastic materials can be melted multiple times without significantly degrading the material. Thermoset materials, by contrast can only be melted once. After a thermoset material cures, attempting to heat it again to its melting point would cause it to burn (rather than melt) the material. It is useful to think of a 2-part epoxy when trying to understand thermoset plastics. An epoxy, like a thermoset material, is liquid prior to setting. Once the resin dries, however, it is not possible to melt it again.
The present invention relates to a bottle made of biaxially oriented thermoplastic material intended to contain a flat liquid which is filled cold.
It is well known that bottles made of thermoplastic material are becoming lighter, which creates problems in obtaining good mechanical strength from these bottles both in the longitudinal direction and in the transverse direction.
The Applicant has proposed to supply a bottle made of bioriented thermoplastic material which, to facilitate its handling on the packaging and distribution chain, has a generally square section, rounded angles, a circular bottom and which resists without significant deformation , when it is filled, at a compression force applied along the longitudinal axis of the bottle. This compressive force is manifested when the bottles are stacked one on top of the other during their storage and transport. In addition, this bottle must have a resistance to the transverse compression forces developed during the holding of the latter in order to pour the liquid which it contains, without the flow of the liquid poured being irregular and causing splashes.