• PP Plastic Preform Injection Mold
  • PP Plastic Preform Injection Mold
  • PP Plastic Preform Injection Mold

PP Plastic Preform Injection Mold

Shaping Mode: Injection Mould
Surface Finish Process: Mirror Polishing
Mould Cavity: Multi Cavity
Plastic Material: PP
Process Combination Type: Compound Die
Application: Household Appliances, Commodity, Home Use
US$ 5/Piece 1 Piece(Min.Order)
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Basic Info.

Model NO.
Hot Runner
Design Software
Transport Package
Internation Standard Package
HS Code
Production Capacity

Product Description

PP Plastic Preform Injection MoldPP Plastic Preform Injection Mold

1Warranty of the molds5 million shots
2Stainless Steel Material of coreS136 (Brand : ASSAB)
3Stainless Steel Material of plates420
4Hardness of coreHRC50~52
5Hardness of cavityHRC50~52
6Hardness of neck ring(thread splits)HRC50~52
7Hardness of mold baseHRC35~38
8Hot Runner systemIt is researched and developed by our itself with consulting from European PET mold expert, adopting the international famous brand components, such as Heater (Brand : hotset ,Nozzle Heater (Brand : RNA, Canada), Plastic cap-insulator (Brand: DUPONT CHEMICAL, USA, withstands 350 Degree C), valve-stem(Material : SKD61, Brand : PUNCH, Japan))
9Number of cooling zones

Both of core plate and cavity plate adopt the central centralized water cooling system
Core Plate:
Water connector :
1pc entries cooling water
1pc outlets cooling water
Cavity plate :
Water connector :
1pc entries cooling water
1pc outlets cooling water
10Cycle time (estimated)Based on final preform wall thickness, preform shape, customer's machine injection process and PET resin's IV etc
11Cooling timeBased on final preform wall thickness, preform shape, customer's machine injection process and PET resin's IV etc
12Indicate spare parts Standard spare parts kits
14Number of points to be controlled (heating and/or thermocouples)Main-runner:  1 point temperature control 1 zone.
Sub-runner: each points voltage controlled mode,  1 point control the copper nozzles of each  cavities

Hot-half Mold features
Hot-runner channels have the top engineering in balance design;
Main parts of hot-half mold such as heaters, valve-stems are imported from Europe;
Drops are controlled individually and heating zone temperatures are adjustable, AA value from thermal degradation is minimized.

1.Hot Runner components
Imported from EUROPE and Italy, which is interchangeable with international leading brand mold makers from Canada

2.Hot-runner design

Manifold use rational balance design, each mold design is calculated by professional mold flow software;
Inner tunnel diameter size is different according to different flow rate require;
3.Preform Acceptance Criteria
  1. Thread tolerances

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 us approved preform drawing.
All ISBT standards can be viewed at stonepackage.en.made-in-china.com
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
3) Individual preform weight     variation from nominal(used minus tolerance)
Nominal weightTolerance
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 WeightTolerance
Less than 35g0.2g
35g to60g (≤0.3g)
Greater than 60g (0.5%×preform weight)
5) Wall thickness variation
Wall thickness variation = maximum wall thickness minus minimum wall thickness
Measured on the body within 3mm of the cavity/gate insert parting line
6) Ovality
Maximum ovality of the preform not to exceed 0.2mm. in the body of the preform

Ovality = maximum diameter minus minimum diameter
7) Perpendicularity

             (prior to re-heat)
Max 0.75mm

Ave: 0.5mm
8) Overall length
( excluding gate protrusion)
Preform lengthTolerance
Up to and including 120mm± 0.5mm
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
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)
12) Scratches
Can not see by visual inspection
13) Mismatch between parting lines (excluding any mismatch designed into the preform)
14) Flash 0.05mm (maximum)
15 ) Bubbles or unmeltsNot acceptable
16) Short shotsNot acceptable
17) Surface contaminationInner 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 contaminationNot acceptable
19) Gate length
Max: 1mm
20) Hole in injection pointLess than 1.0mm deep
21) Cold slugsNot acceptable
22) HazeNot acceptable
23) Moisture ringsNot acceptable
24) Degraded materialNot acceptable
25) Gate linesNot acceptable
26) Weld lines top of ventNot acceptable

27)  Polarized light
Stress within a preform can be detected by the use of polarized light. Preform design, resin and proscessing conditions all affec the stresses within a preform.
As the stresses shown by polarized linght are subjective, this tool will only be used for reference.

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