Warranty: | After Shipping 14 Month |
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Shaping Mode: | Injection Mould |
Surface Finish Process: | Mirror Polishing |
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Attribute |
Specification |
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Thread tolerances are as per the International Society of Beverage Technologists "ISBT" standards. If the thread finish type is not within the ISBT standards, tolerances will be based on the approved preform drawing. All ISBT standards can be viewed at |
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2) Thread dimensions inspected (Coca China only check E, T, D, ID, "A" points dimension and calculation for these five points shall be>1.33) |
Standard dimensions inspected are as per the drawing shown |
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3) Individual preform weight variation from nominal (used minus tolerance) |
Nominal weight | Tolerance | |||||||
Less than 20g | ± 0.2 g | ||||||||
20g to 35g | ± 0.3 g | ||||||||
Greater than 35g to 50g | ± 0.3 g | ||||||||
Greater than 50g | ± 1 % | ||||||||
4) Maximum allowable weight variation between preforms in one shot. On an Index system, one shot is defined as a "single" face of the mold. |
Nominal Weight | Tolerance | |||||||
Less than 35g | 0.2g |
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35g to 60g | (≤0.3g) | ||||||||
Greater than 60g | (0.5%×preform weight) | ||||||||
5) Wall thickness variation
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Wall thickness variation = maximum wall thickness minus minimum wall thickness Measured on the body within 3mm of the cavity/gate insert parting line |
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6) Ovality |
Maximum ovality of the preform not to exceed 0.2mm. in the body of the preform Ovality = maximum diameter minus minimum diameter |
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7) Perpendicularity (prior to re-heat) |
Max 0.75mm Ave: 0.5mm |
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8) Overall length ( excluding gate protrusion) |
Preform length | Tolerance | |||||||
Up to and including 120mm | ± 0.5mm |
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Over 120 mm | ± 0.5% of perform length | ||||||||
9) Crystallinity |
Crystallinity in gate area: to be within 8mm diameter centered on gate tip (for preform base diameter less than 35mm) Crystallinity through the gate area: to have a depth less than 50% of the bottom wall thickness Crystallinity in body: not acceptable |
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10) Sink marks |
Not acceptable | ||||||||
11) Parting line deformation (Valid for Index molds only) |
Parting line deformation "PLD" on preform body : Many factors effect PLD including , preform design, parting line location, processing conditions Wall thickness less than 4.00mm.: Max. 0.20mm Wall thickness 4.0mm and greater: Max. 5% of wall thickness (Wall thickness measured and neck ring/cavity parting line) |
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12) Scratches |
Can not see by visual inspection | ||||||||
13) Mismatch between parting lines (excluding any mismatch designed into the preform) | 0.05mm(maximum) |
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14) Flash | 0.05mm (maximum) | ||||||||
15 ) Bubbles or unmelts | Not acceptable | ||||||||
16) Short shots | Not acceptable | ||||||||
17) Surface contamination | Inner and outer surface to be free of foreign material, e.g. dirt, grease, oil, … Not Acceptable on inner and outer surface of preform unless determined to be a result of the pet resin used | ||||||||
18) Embedded contamination | Not acceptable | ||||||||
19) Gate length |
Max: 1mm | ||||||||
20) Hole in injection point | Less than 1.0mm deep | ||||||||
21) Cold slugs | Not acceptable | ||||||||
22) Haze | Not acceptable | ||||||||
23) Moisture rings | Not acceptable | ||||||||
24) Degraded material | Not acceptable | ||||||||
25) Gate lines | Not acceptable | ||||||||
26) Weld lines top of vent | Not acceptable | ||||||||
27) Polarized light |
Stress within a preform can be detected by the use of polarized light. Preform design, resin and processing conditions all affect the stresses within a preform. As the stresses shown by polarized light are subjective, this tool will only be used for reference. |
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