Rudis materiae et processui ex pet resina ad preform vestibulum

I. De basis rudis materia

In prima rudis materia est pet resina (polyethylene terephthalate), thermoplastic polyester.

Euge aedificium cuneos:

Purified Terephthaalum Acidum (PTA)

Chemical Formula: C₆h₄ (Cooh) ₂

A alba crystallina pulveris derived maxime a P-Xylene (PETROLEUM, secundum).

Dat eius rigiditatem et obice proprietates.

Monoethylene glycol (Meg)

Chemical Formula: C₂h₆o₂

A colore, Syrupy Liquid (etiam ex PETROLEUM, viahylene).

Providet flexibilitate ad Polymer catena.

Polymerization reactionem:

Gradus I - PRINCIPIUM / TranSterificatio: PTA Reacts cum MEG ad formare bis (II-hydroxyethyl) Terephthalate (Bhet).

Gradus II - Polycondensation: Bhet moleculis copulare in longum vincula, releasing aqua vel ethylene glycol ut byproduct.

Hoc producit pet Polymer vincula.

II. Pet resin forma

Post polymerization, pet est solidatae et interficiam in parva transparent pellets vel granulis ad facillimus tractantem.

Viscositas intrinseco (IV):
Pet resina pro prominefs typically habet IV inter 0.76 - 0,86 DL / g, determinandum Molecular pondus et mechanica vires.

III. ELOGATUSs in pet resina

Petr resina pro preforms saepe continet additives ad augendae proprietatibus:

IV. Siccatio ante processus

Pet resina est hygroscopic (absorbet humorem a aere).
Si processionaliter cum humorem intra, hydrolysis et fieri → mocecular torquem frangit → infirma preforms.

ARCENSUS Conditions:

Temp: 160-180 ° C

Time: 4-6 Horae

Finalis humorem content: ≤ L PPM

V. A resina ad Formeform

Processus: Iniectio CUMATIUM

Pet Pellets sunt pascuntur in Hopper

Liquefactum ad ~ 270-280 ° C

Infusum in ferro fingunt informibus sicut preform

Refrigeratum cursim retinere robore

Et Preform tunc vultus sicut test fistulam cum utrem capre - Promptus pro proten CUMATIUM.

In summary:

Et rudis materia Pet prominefs Est pet resina pellets ex PTA Meg per polymerization, interdum additives sicut UV absorbers, colorants, et reheat agentibus. Ante usum, resina oportet siccari, tum iniectio fingitur in prominet.