Custom Silicone Pumpkin Mold | Dutch 2022 Project
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Product |
6-Cavity Halloween Pumpkin Silicone Baking Mold |
|---|---|
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Order Quantity |
Initial Order: 35,000 pcs |
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Material |
Food-Grade Solid Silicone |
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Key Specs |
Hardness: Shore A45 |
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Certification |
FDA Compliant, BPA-Free, Phthalate-Free |
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Lead Time |
DFM Evaluation: 24 hrs |
Project details
A Dutch holiday-themed baking tool brand planned to develop a 6-cavity pumpkin-shaped baking mold. The samples provided by the client’s original supplier had several issues: difficulty in completely demolding the thin, pointed parts of the pumpkin relief, inconsistent heights among the six cavities, and air trapping within the relief recesses.
To address the client’s needs, Z.S.R performed DFM optimization on the product structure, mold rigidity, injection system, and venting, protecting the pumpkin relief details, improving base plate rigidity, and optimizing the runner and venting design.
Based on the DFM results, the project moved into mold making and sample production, followed by quality verification of the first batch before mass production.
Delivery data
Engineering DFM Assessment
Rounded Corners and Draft Angle for Pumpkin Relief
Z.S.R added a 0.3~0.5 mm rounded corner to the sharp corners of the pumpkin relief, smoothed the base, and added a 1.5° draft angle to the cavity sidewall to prevent stress concentration at sharp corners and reduce friction during mold opening.
Pumpkin reliefs are thin-walled areas of concentrated stress, with high demolding resistance on the vertical sidewalls, making them prone to cracking during demolding. Increasing the radius of the corners, combined with the draft angle, disperses the concentrated stress, reduces demolding force, and improves the tear resistance of the relief structure, ensuring the integrity of the facial details in the finished product.
Thickened Base Plate and External Reinforcing Ribs
The thickness of the mold base plate was increased from 2.0 mm to 2.8 mm, and a 2.0 mm reinforcing rib was added to the outer frame to ensure that the base plate and cavity do not deform at room temperature.
A thin base plate is prone to deformation and warping under repeated heating. Thickening the base plate and adding reinforcing ribs significantly improves the overall structural rigidity and reduces heat-induced deformation.
Balanced Six-Cavity Feeding and Independent Venting Channels
Engineers adopted a symmetrical runner system and added 0.02 mm micro-venting channels at the lowest points and corners of the pumpkin relief grooves to ensure balanced feeding in all six mold cavities and smooth air expulsion from the relief.
The injection system of a 6-cavity mold can cause inconsistent filling pressure and flow rate in each cavity, resulting in insufficient filling of the far cavities and air trapping within the relief texture. Symmetrical runners balance the pressure, and independent venting in the dead corners of each relief ensures clear and full facial textures on the finished product.
Mold Making, Sample Production & Quality Verification
Mold Processing
Z.S.R Group is equipped with 10 advanced CNC machining centers and 4 EDM machines for silicone pumpkin mold making. The embossed area uses micro-engraving to create the pumpkin face patterns, and the cavity is polished to Ra0.2 μm to ensure clear patterns.
Silicone Molding
Production is supported by 48 solid-state molding machines, 12 liquid molding machines, and 13 injection molding silicone machines using food-grade solid-state silicone molding technology, enabling the rapid molding of 30,000 silicone pumpkin molds within 20 days. Over 10 printing and spraying production lines also allow for printing logos or patterns on the products.
Secondary Vulcanization
After molding, the silicone pumpkin molds undergo secondary vulcanization at 200°C for 2 hours.
The secondary curing process removes small-molecule volatiles, reduces product odor, and ensures the molds meet food contact requirements.
Quality Inspection
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Test |
Condition |
Acceptance Criteria |
Result |
|---|---|---|---|
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Fold Endurance Test |
Repeated folding of mold cavities for 5,000 cycles |
No cracks, no significant stress whitening |
Pass |
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Tear Strength Test |
Tear test on notched specimens |
Tear strength ≥ 22 kN/m |
Pass |
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Thermal Cycling Test |
50 cycles of 30 min freezing at -40°C ↔ 30 min baking at 230°C |
No deformation, cracking, hardening or oil exudation |
Pass |
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Flatness / Warpage Test |
Cooled after baking at 230°C, placed flat on a glass surface |
Base plate warpage ≤ 1.2 mm |
Pass |
|
Embossed Detail Inspection |
Microscopic inspection of pumpkin face embossed patterns |
Patterns are fully formed, with no missing corners or tearing |
Pass |
|
Dimensional Tolerance Inspection |
2D vision measuring system inspection of outer dimensions and individual cavity sizes |
Dimensional deviations controlled within ±0.20 mm |
Pass |
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Visual Inspection |
Full inspection of entire product |
No bubbles, material shortage, flash or scratches |
Pass |
|
Food Contact Test |
FDA-related food contact testing |
Meets applicable food contact requirements |
Pass |
The production samples passed the specified fold endurance, tear strength, thermal cycling, flatness, embossed detail, dimensional tolerance, visual, and food contact inspections. In particular, the pumpkin face embossed patterns were fully formed with no missing corners or tearing.
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Customer reviews & feedback
“We have received it, and the quality is excellent. We are currently conducting market testing. Thank you.” The customer subsequently reported positive sales and placed an order for another 5,000 units.
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