Size suggestions for indoor use of PVC baseball
When using PVC baseballs indoors, three core requirements must be given priority: space limitations, safety, and operability. The following suggestions are provided from the perspectives of size selection, material compatibility, and user scenarios:
1. Diameter design: Balancing impact feedback and space occupation
Recommended diameter range: 6.5 cm to 7.0 cm
Spatial adaptation logic
A sphere with a diameter of 6.5 centimeters has a volume approximately 70% of that of a standard baseball. It can significantly reduce the flight distance after hitting the ball and is suitable for indoor Spaces with a ceiling height of less than 3 meters (such as living rooms and offices).
The 7.0-centimeter diameter sphere is closer to the standard ball grip, but it needs to be combined with lightweight design (such as weight ≤100 grams) to reduce the flight distance. It is suitable for indoor venues with a ceiling height of more than 3.5 meters (such as school gymnasiums).
Safety redundancy design
For every 0.1 centimeter increase in diameter, the lateral flight range of the ball after hitting the ball may expand by 5% to 8%. The size needs to be adjusted according to the width of the room. For example, for a room with a width of 5 meters, it is recommended to give priority to choosing a sphere with a diameter of 6.5 centimeters.
2. Weight optimization: Control flight distance and hitting feel
Recommended weight range: 50 grams to 100 grams
Lightweighting logic:
A 50-70-gram ball is suitable for children or scenarios with limited space (such as a floor height of no more than 3 meters). After hitting the ball, the flight distance can be shortened to 60%-70% of that of a standard ball.
The 80-100-gram ball is closer to the weight of a standard ball and is suitable for teenagers or professional training. However, the rebound force needs to be reduced through materials (such as foamed PVC) to avoid penetrating the ceiling or damaging the lamps.
Dynamic balance design
By adjusting the core density (such as using a composite structure of cork and PVC), a balance of “light weight and high elasticity” can be achieved. For instance, an 80-gram sphere can ensure the impact feedback while keeping the flight distance within 8 meters.
3. Materials and Structure: Enhance safety and durability
Material selection:
Foamed PVC: Density 0.8-1.0 grams per cubic centimeter. Hardness is reduced and impact force is minimized through microcellular foaming technology, making it suitable for children or home Settings.
Composite material: The outer layer is made of high-hardness PVC (Shore hardness ≥70A) for wear resistance, while the inner layer is filled with soft materials (such as EVA foam), balancing durability and safety.
Structural design
Surface anti-slip treatment: Add concave-convex texture or silicone coating to enhance grip stability and reduce the risk of dropping when hitting the ball.
Buffer layer design: Add an elastic buffer layer (such as TPU film) inside the sphere to further absorb the impact force and protect the interior walls or furniture.
4. Scene adaptation: Select the size based on usage requirements
Family entertainment scene:
Recommended size: Diameter 6.5 cm, weight 50-70 grams.
Design logic: The lightweight design reduces the demand for hitting power, making it suitable for children or non-professional users. Small-sized spheres reduce space occupation and avoid hitting lamps or glassware.
School/training institution scenario:
Recommended size: Diameter 6.8-7.0 cm, weight 80-100 grams.
Design logic: The size and weight close to the standard ball are conducive to technical movement training. Meanwhile, the flight distance is controlled through lightweight design, making it suitable for indoor venues with a ceiling height of over 3.5 meters.
Office stress relief scene:
Recommended size: Diameter 6.5 cm, weight 50-60 grams.
Design logic: The ultra-lightweight design reduces noise and impact, making it suitable for use in office cubicles or small meeting rooms to avoid disturbing others.
5. User feedback and optimization directions
Security Enhancement
Users generally report that “lightweight spheres are prone to being accidentally hit to high places”, and it is suggested to increase the surface friction of the spheres (such as by using a frosted treatment) or reduce the rebound coefficient (such as by adjusting the material formula).
Enhancement of fun
Some users have expressed their hope to increase the visibility of the ball. Fluorescent color coatings or luminous materials can be used to enhance indoor visibility and reduce the risk of accidental strikes.
Portability optimization
To address the issue of “inconvenient storage”, a compressible sphere (such as an inflatable PVC baseball) or a matching storage net bag can be designed to enhance the user experience.
Summary
The size design of indoor PVC baseball should focus on safety, space adaptability and hitting feedback. It is recommended that the diameter be controlled between 6.5 and 7.0 centimeters and the weight be controlled between 50 and 100 grams. Foamed PVC or composite materials should be given priority. Through structural optimizations such as surface anti-slip treatment and buffer layer design, the practicality of the product and user satisfaction can be further enhanced.