The Story Behind Starpery W.R. 4.0

In 2021, Starpery Doll became the first brand in the sex doll industry to introduce weight-reduction technology for both TPE and silicone dolls, achieving notable improvements in overall weight and softness. However, early applications revealed a major challenge: it was difficult to standardize the weight reduction process. Some dolls turned out slightly stiff or heavier than expected, and the weight loss data fluctuated significantly.

Challenges with W.R. 3.0

During the initial testing phase, Starpery engineers discovered a fundamental conflict between softness and weight:

• Using a softer W.R. foam core caused the heavier silicone or TPE material (up to 25 kg) to compress the core excessively during pouring, resulting in hardening and poorer weight reduction.
• Using a harder foam core produced lighter dolls, but their softness suffered.

Balancing these two factors proved extremely difficult, and this contradiction became the main limitation of W.R. 3.0.

Formation of the W.R. Team

At the start of 2022, Starpery formed an independent W.R. R&D team to tackle this problem. The team experimented with various methods:

1. Horizontal pouring: Laying the doll mold flat to reduce the gravity effects on the foam core.
2. Rotary pouring with spindle frames: Fixing the mold on a rotary frame and injecting foam, though results were inconsistent.
3. Numerous additional methods: Despite repeated testing, no method could reliably achieve both significant weight reduction and realistic softness.

The team even questioned whether these goals were inherently contradictory. However, persuaded by company leadership, they chose to persevere.

Breakthrough Idea

The breakthrough came when the team decided to separate the mold during pouring, first filling the lower part of the body with silicone/TPE and then pouring the remaining material before it solidified. This approach required redesigning the 172 cm silicone mold.

Initial results were promising: dolls became softer and lighter. Yet, new issues emerged, including increased mold lines and uneven material distribution. The team then distilled their learnings over six months:

• Non-woven fabrics in the foam core increased hardness, so they needed to be eliminated to allow direct contact between foam core and silicone.
• Using a slow “drip irrigation” pouring method helped reduce compression on the core.
• Combining horizontal pouring for the first stage and vertical pouring for the second stage improved consistency.

W.R. 4.0 Implementation

At the beginning of 2023, the W.R. team fully implemented these improvements:

• Foam core molds were refined to better align with the skeleton, reducing skin unevenness and material shortages.
• Foam core thickness was carefully controlled to maintain optimal skin thickness.
• The skeleton, foam core, and mold were integrated into a single unit.

These changes resulted in the 172 cm doll being approximately 5.3 kg lighter than W.R. 3.0, with significantly improved, realistic softness.

For mass production, further refinements were made:

• Mold lines were minimized by adding openings in the hands and feet to fix the skeleton and ensure firmness.
• Foam core thickness was further reduced, allowing controlled silicone pressure for better results.
• A new pouring machine standardized production and reduced defects.

By mid-2023, tests on 172 cm and 151 cm dolls confirmed the results:

• 172 cm body weight reduced from 35+ kg (W.R. 3.0) to 29 kg
• Superior softness throughout the doll, surpassing even TPE in overall feel

Additional testing included toughness, heating, moaning, clamping, suction, and gel butt options, ensuring consistent performance with extra features.

W.R. 4.0 Weight-Reduction Data by Body Type

Starpery’s WR 4.0 silicone weight-reduction technology is now the default for all silicone bodies, except for a few that have not yet been upgraded.

Starpery W.R.4.0 vs W.R.3.0

Compared with W.R. 3.0, W.R. 4.0 not only makes the dolls lighter in weight but also improves their overall softness. Thanks to the application of W.R. 4.0 technology, Starpery’s BBW body types have become especially popular—because they are impressively light!

The development of W.R. 4.0 represents Starpery’s dedication to solving the long-standing challenge of balancing weight and softness in silicone and TPE dolls. Through persistent research, iterative mold design, and innovative production techniques, Starpery has set a new industry standard, delivering lighter, softer, and more realistic dolls than ever before.