Selection of independent bagged springs and Bonnell springs
When shopping for mattresses, young friends often hear how advanced the independent bagged spring system is and how its performance can crush all other spring systems; The Bonnell spring system is outdated and has been phased out, and so on. Although our ultimate goal in purchasing a mattress is to wake up elegantly in the morning after a peaceful night’s sleep. But only by clearly explaining one’s needs for mattresses to the bed vendor and recommending suitable products can this ultimate goal be achieved.
The support system (spring system of a spring mattress) is the core and most important part of a mattress. Strictly speaking, different support systems correspond to different functional requirements, and no support system can meet all functional requirements very well. Having a basic understanding of the spring system can help determine whether the bed vendor is objective and professional, and also help them have a clear idea when faced with dazzling sales rhetoric.
What are the differences between independent bagged springs and Bonnell springs, which are two different structures, features, and uses of spring mattress support systems?
Using them to make mattresses for people to try lying down, they can only be tried lying down but not touched by hand. Non experienced professionals cannot identify the type of spring system; Some people may say that anti-interference ability is different, which can be distinguished by jumping around in bed, but in fact, some people still cannot distinguish it. A mattress with good stability, no matter what spring system is used, interference will not be so strong, and anti-interference is not only achievable with independent bagged springs.
In fact, different mattress support systems have their own “advantageous zones” of support and different elastic characteristics. The difference in physical sensation is not so obvious, after all, the “truly valuable performance” of mattresses can only be truly manifested when people are asleep; Only by waking up in the morning can one truly see its effects.
The core difference between these two spring structures lies in their elastic performance: the independent pocket spring is a stress structure spring, while Bonnell is a non stress structure spring. These two types of springs exhibit different reactions when dealing with changes in pressure. That is to say, the difference between them that users can feel is mainly reflected when lying down, turning over, adjusting body posture, and sitting up. In static conditions, their load-bearing performance is completely the same.
Differences in elasticity performance
The Pocketed Coil system is a mattress support system that compresses individual springs and places them into connected bags to form “spring bars”. These “spring bars” are then connected together to create a complete spring bed net.
Each spring in this spring system is always under pressure, and the structure that applies “pressure” in advance is a prestressed structure. The repulsive force that this spring always maintains is the stress of the spring.
The above concept is obscure and can be simply understood as the spring being compressed before a person lies in bed. Its characteristics are: within its elastic range, the spring exhibits relatively uniform resistance (supporting force) under pressure (smooth curve), gentle (slow change in pressure), and stable (overall deformation is small).
The Bonnell spring system is a support system for a spring bed mesh made by stringing independent Bonnel springs together with a thin strip spring (string spring) and fixing them to the frame.
This type of spring maintains its “natural state” without pressure or force, that is, its inherent formed form. In terms of mechanical structure, this spiral spring itself will only generate resistance after being subjected to force, and there is no external stress in its natural state.
The characteristic of the Bonnell spring system is that the working stroke of the spring is relatively large, but the resistance (bearing force) exhibited under pressure is uneven (uneven curve), with a gradient feeling from no deformation (static state) to deformation (back compression deformation). To put it simply: It’s a bit like an automatic transmission car with fewer gears, there is a jerky feeling when starting, but if you drive at a constant speed on the highway, there is no jerky feeling anymore; In addition, Bonnell springs exhibit significant elasticity when subjected to dynamic forces, while the elasticity of independent bagged springs is very weak.
Results of Differences in Elasticity Performance
These two different spring systems exhibit significant differences in their load-bearing capacity when supporting different pressures. From the following figure, we can see that:
The independent bagged spring system (blue curve in the figure below) has a uniform and consistent response (resistance) to pressure within its ideal elastic range. Compared to the Bonnell spring system (orange curve in the figure below), it is more sensitive when carrying smaller pressures; But when carrying pressure beyond the rational range, it appears “powerless” and almost loses elasticity.
The Bonnell spring system has a wider range of ideal elasticity. Within the ideal elastic range, there is a jerky sensation in the response to pressure (resistance) (with a sharp change on the leftmost side of the orange curve). The Bonnell spring system is relatively sluggish for small pressure feedback; But it can exhibit good elasticity when bearing high pressure, which has significant advantages over independent bagged spring systems.
To sum up, starting from their elastic performance, the advantage of the independent bagged spring system lies in producing mattresses with moderate to slightly hard softness. Within this range, it can provide uniform and consistent support; The advantage of Bonnell spring system lies in manufacturing mattresses that are hard to very hard. The extremely hard mattress made with Bonnell spring system has a load-bearing capacity that cannot be compared or even replaced by other springs.
Supplement to Bonnell Spring System
According to the current level of industrial development in China, manufacturing high-quality spring bed nets is no longer a problem for professional mattress or spring manufacturers. The bed net in the picture is a bonnel spring system without partitions. Although the test below has no comfort, it can basically maintain the natural curvature of the human body.
Please note the two details in the above picture:
Although this is an ordinary spring bed net without partitions, the tester’s spine still maintains the natural curvature of the human body, indicating that partitions are not the only way to maintain natural curvature;
The spring next to the spring that is pressed down by the human body does not deform, and the magnitude of deformation of adjacent springs is the “anti-interference ability” of the spring system, indicating that the anti-interference ability of the spring system itself is not as different as it seems. Although this cannot be confused with the anti-interference ability of the final mattress product, it helps readers judge the correctness of the viewpoint that “anti-interference is only based on independent bagged springs” and can be used to demonstrate the professionalism of bed vendors who hold such views.
Different methods for adjusting softness and hardness (support)
️️️️● The independent pocket spring system can change the softness and hardness (support) of the entire bed net by adjusting the softness and hardness (resistance) of its individual springs.
Small supplement: There are several different arrangements of independent bagged spring matrices (parallel equidistant), interlocking arrangements (cross shaped), and cross arrangements (mixed springs with different resistances), but the springs must be connected to each other and the adjustable range is relatively limited.
Bonnell spring adjustment can change the softness and hardness (supporting force) of the entire bed net by adjusting the softness and hardness (resistance) of individual springs, and can also change the softness and hardness of the entire bed net by adjusting the density and arrangement of springs.
The difference between manufacturing process and industrial structure
The independent bagged spring system has rapidly developed with the rise of the mattress market and has been dominant for over a decade. The industry is very new, so it is basically in line with the most advanced international level, without the burden of outdated concepts and equipment. In addition, its industry threshold is relatively low, and it has become the most important spring support system for spring mattresses in China.
The Bonnell spring is an upgraded version of the oldest Hooke coil spring, but its upgrade is the knot that is criticized today. At that time, due to the manufacturing level of spring steel wire, only knotting could improve the stability of individual springs and the integrity of the spring system, and could suppress “torsion” and enhance durability. Bonnell springs can be considered a spring revolution back then, but it has been over a hundred years since then.
People have developed aesthetic fatigue towards this classic spring, and mattress manufacturers are unwilling to tell the same story repeatedly. In addition, there are a large number of old equipment, outdated production capacity, uneven product quality, and irrational industry reputation. Therefore, Bonnell springs are slowly fading out of the market.
At that time, mattresses that had been rolled with rollers were mostly made of Bonnell spring bed nets.
Differences in consumer cognition
There is a significant difference in consumers’ understanding of these two spring systems, with independent bagged springs being the mainstream. Bed vendors often talk about them, and consumers also listen to them more; Bonnell springs are fading out on the road, and as bed vendors speak less, consumers naturally listen less. In addition, people’s innate obsession with “new” has created a huge difference in their understanding of independent bagged springs and Bonnell springs today.
Dongguan Liansheng Non woven Technology Co., Ltd. was established in May 2020. It is a large-scale non-woven fabric production enterprise integrating research and development, production, and sales. It can produce various colors of PP spunbond non-woven fabrics with a width of less than 3.2 meters from 9 grams to 300 grams.
Post time: Jun-07-2025