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Nuogu Technology (Shanghai) Co., Ltd
Spider Mold Test Mold
NegotiableUpdate on 05/06
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Overview
Spider Mold Test Mold: A practical and industry standard rubber flowability testing solution for Spider Mold, which includes mold specifications, standard operating parameters, grading standards, and comparison methods. It is suitable for rubber blends (NR/SBR/BR/EPDM/NBR, etc.) and can be used for research and development, quality inspection, and incoming material control.
Product Details
1Spider Mold Test MoldRecommended standard spider mold specifications (industry standard)
Suitable for the vast majority of rubber compounds, you can directly find a mold factory for processing.
1. Mold structure
Type:Center gate+8 radial flow channels(Spider with 8 legs)
Gate: Center circular gateØ8–10 mm
Channel cross-section:rectangle
Width:4 mm
Depth:2 mm
Channel length:Total length 60 mm(Effective flow length of about 50 mm)
Channel angle:45 ° uniform distribution
Mold material: P20/718H mold steel, surface polished Ra ≤ 0.8
Why choose 8 legs 4 × 2 mm: It can reflect flow differences without being too sensitive and causing poor repeatability, and is a commonly used Spider Mold size in the rubber industry.
IISpider Mold Test MoldStandard testing process parameters (directly copied)
Default testing conditions:170℃ / 10 MPa / 10 min(EPDM, NBR, high hardness rubber compound can be fine tuned)
1. General Standard Procedure (SOP)
- Preparation of rubber material
Parking of mixed rubber for ≥ 4h, ≤ 72h
Sampling weight:15±1 g(Ensure to fill the center and start flowing)
Pressed into circular pieces, without bubbles or wrinkles
- mold preheating
Temperature:170℃
Preheating time:≥30 min
The template has good parallelism and no bias voltage
- Loading and mold closing
Place the adhesive material in the center
Quickly close the mold and apply pressure:10 MPa（100 kgf/cm²）
Instant timer:10 min
- Pressure holding vulcanization
Maintain 170 ℃ and 10 MPa throughout the entire process
Time to open the mold, take out the spider sample
- Cooling and measurement
Measure after cooling at room temperature for 30 minutes
Measure 8 legsFlow lengthTake the average value
3、 Recommend fine-tuning parameters based on adhesive type
You can directly apply it by pressing below:
| Glue type | Recommended temperature | pressure | time | explanation |
|---|---|---|---|---|
| NR/SBR/BR universal adhesive | 170℃ | 10 MPa | 10 min | Common benchmarks |
| NBR nitrile rubber | 170–175℃ | 10–12 MPa | 10 min | High viscosity, slightly increased pressure |
| EPDM (Ethylene Propylene Diene Monomer) | 175–180℃ | 12 MPa | 10–12 min | Poor liquidity, requiring higher temperature and pressure |
| High hardness adhesive (Shao A 80+) | 175–180℃ | 12–15 MPa | 10 min | Difficulty filling |
| Easy to burn adhesive material | 165–170℃ | 10 MPa | 8–10 min | 防止提前硫化 |
4、 Interpretation criteria for results (industry standard rating)
withAverage flow length of 8 legs LAs a core indicator:
1. Liquidity level (170 ℃/10min/10MPa)
L ≥ 45 mmGood liquidity
40 mm ≤ L ＜ 45 mmGood liquidity
35 mm ≤ L ＜ 40 mm: Average liquidity
30 mm ≤ L ＜ 35 mmLiquidity deviation
L ＜ 30 mmPoor liquidity, difficult to fill
2. Grading of appearance defects (very critical)
Simultaneously observe whether:
Shortage of materials, broken leg
Flow marks, sesame surface
Bubbles, layering
Burnt lumps, hard particles
Uneven branch length (poor dispersion)
Branch length difference>5mmdetermined to beUneven mixing/poor dispersion of fillers.
5、 Fixed method for formula comparison/quality inspection
If you want to doBatch stability, formula comparison, supplier comparisonUsing this set of fixed conditions:
Temperature:170℃
Stress10 MPa
Time:10 min
Sample size:15 g
Measure each sample3 modelsRemove outliers and take the average length
Example of qualified judgment (can be directly written into the standard):
The average flow length is ≥ 38 mm, and the length range of the 8 legs is ≤ 4 mm, with no obvious material shortage, bubbles, or burning.
6、 Corresponding relationship with Meni and rheometer (convenient for internal benchmarking)
Mooney viscosity ML (1+4) low at 100 ℃Spider flow lengthlong
Burning time t5 is shortSpider is prone to appearingInsufficient filling, short legs
High apparent viscosity of capillary tubeSpider flow lengthshort
The maximum value of Spider Mold:It can be seen that there are "dispersibility, mixing uniformity, and complex channel filling" that cannot be seen by Menny.
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