Buying furniture is always a very responsible process. I want everything to be good: beautiful design, maximum convenience, and quality that will please me for many years. It is even more difficult to choose a sofa, because it is the center of gravity in the apartment. After a hard day at work, you want to come home and relax while watching your favorite movies and TV series, so it’s important to find the perfect model.
If design is a matter of taste, then the level of convenience depends on the content. In general, all internal structures can be divided into two large groups: spring blocks and polyurethane foam. Each option has its own set of properties. In this article, we will break down their main differences and try to find the answer to the question of which sofa is better: spring or polyurethane sofa.
Comparison of properties of polyurethane foam and spring blocks
First you need to decide what kind of furniture you prefer. Soft or harder? Springy or more static? In addition, it is important to decide for what purpose you are choosing a sofa: for gatherings or for daily sleep. It is better to choose furniture based on these nuances.
The filling of a sofa actually determines its key properties. Thus, polyurethane is a synthetic material with a porous and airy structure. It is suitable for lovers of hard and medium models that do not “jump” when you sit on them. The density and hardness of the seat depends on the density of the material and the number of layers. Polyurethane foam is a strong and durable option, which is chosen even by restaurateurs, since they need the most wear-resistant models.
A spring block consists of springs connected to each other. They are located vertically and parallel to each other. These models are ideal for those who like to relax while reading books or watching TV. It is believed that such structures are not as durable as polyurethane fillers. However, the spring blocks are protected by durable material: they do not wear out or become loose over time, maintaining their original properties for a long time.
Features of a polyurethane foam sofa
Now let's look at another option and its features.
- The ability to restore its previous form.
- High density. Able to replace the spring block.
- There are no signs of mold.
- High percentage of sound insulation.
- Does not cause allergies. Has health and safety inspections.
- Withstands temperature conditions.
- Elastic.
Pros of a PU sofa
Now about the positive aspects of polyurethane foam.
- The sofa is completely hypoallergenic, indispensable for people suffering from allergenic diseases.
- Germs and dust do not accumulate.
- Treated with Antibacterial agents. There are no appearances of fungi.
- High wear resistance. Can last more than 10 years if properly treated.
- The breathability is good, which allows it to have a positive effect on a person.
- When pressed, it instantly restores its previous appearance.
Cons of a PU sofa
And yet, it is worth mentioning the disadvantages.
- If used incorrectly, it often sags.
- May become deformed if exposed to direct sunlight. Therefore, the manufacturing material must have protective properties.
- Ease of combustion, which releases toxins.
- Too soft. Not suitable for those people who have problems with the spine.
Advantages and disadvantages of fillers
- springs;
The model with a spring block according to its internal design can be of two types: “Bonnel” and with independent parts. The first option consists of springs that depend on each other, which all move together under one influence. The sofa can easily support a weight of 110 kilograms. Moreover, such models are the most economical. Their main drawback is the fairly rapid deformation process. Manufacturers are gradually abandoning this model in favor of an independent spring design.
The second option is much more practical and durable. A high degree of elasticity creates an anatomical effect. Such furniture is very comfortable because the springs bend in proportion to the weight, precisely adapting to the contours of the body. However, the price of such models is much higher due to complex assembly technology.
- polyurethane foam;
Despite the fact that the polyurethane foam filling is synthetic, it is safe for health. At the same time, the price of a PPU sofa is lower than that of the model described above. From a practical point of view, it is convenient because it does not collect dust and retains its original characteristics for a long time, and from the point of view of appearance, the material gives the designer complete freedom of imagination. Folds and carriage ties on the seat are possible only with the use of polyurethane foam.
Polyurethane foam filler can be of two types in its structure: block and cast. The first option consists of sheets of the same size, from which the required parts are cut out and folded in layers, while the second option is immediately made into the desired shape and used to create complex models.
Among its shortcomings, buyers note only rigidity. In addition, if the material is cheap and of poor quality, over time it may “sag” and lose its shape, but this is rather an exception to the rule. But it has a lot of advantages:
- durability and wear resistance;
- safety and hypoallergenic;
- allows air to pass through and does not accumulate dust.
For many, the deciding factor is, of course, design. It is also important to note the fact that the polyurethane foam filler complements the sofa seats with springs. With this design, blocks alternate with layers of foam, which increases the service life of the springs.
Spring fillers
There are several types of spring fillers - independent spring block, dependent spring block “Bonnel” and spring block “Snake”. They differ depending on:
- spring diameter;
- their heights;
- the thickness of the metal rod from which the springs are made;
- number of springs per square meter.
The technology for manufacturing spring fillers is quite old, but they are still popular because they have a number of advantages:
- withstand heavy weight;
- durable to use;
- have orthopedic properties;
- good air exchange;
- sufficient elasticity and rigidity.
Spring fillers inside sofas are found both in antique furniture and in modern sofa models.
Independent spring block
It consists of separate elements representing barrel-shaped springs that do not touch each other. Each spring is placed in a separate cover made of non-woven material, which has a high level of strength. The covers are connected with elastic connections, and the entire structure is glued on both sides with non-woven fabric, which eliminates deformation.
In such structures, the load is distributed pointwise, the block does not sag, and is silent when the resting person changes position.
Independent block springs have a diameter of 5 to 6 centimeters and a density of 250 pieces per square meter. To give softness to the sofa seat, the independent spring block is covered on both sides with soft material - coconut coir or felt.
Dependent spring block “Bonnel”
In this design, high-quality steel springs are connected to each other by steel wire with knots. The entire structure is secured on both sides with a metal frame, which makes the block stable, since the displacement of the springs is eliminated. The Bonnel block is elastic and reliable, capable of withstanding significant loads. The small diameter of the springs and their high density per square meter achieve the orthopedic effect of the product.
The top of the springs is covered with additional soft fillings for the comfort of the furniture.
Spring block “Snake”
Used in the seat and back of the sofa. Galvanized metal springs are located transversely to the base. They are attached to the wooden base with clips or hinged strips. The top is covered with felt. The seat is soft with a springy effect. Such a spring block is not able to withstand heavy loads and after some time of use begins to sag. Therefore, sofas with such filling are not suitable for sleeping.
Which sofa to choose: spring block or polyurethane foam
The choice of the final model largely depends on your preferences. Design and size are the first thing people pay attention to when purchasing. However, for classic models the question of filler remains open.
It is important to focus on the purpose of the purchase. For example, Bonnel springs for the kitchen are perhaps the worst option, because dining on a soft sofa at the table will be uncomfortable. For this reason, rigid polyurethane fillings would be more appropriate here.
It is worth choosing soft spring sofas for the living area. Sitting in front of the fireplace on a soft sofa, wrapped in a blanket, is a real pleasure. For sleeping, it is better to take compromise options of medium hardness with a convenient and reliable folding mechanism. Ultimately, the ideal option is the one that suits your desires. Choose the best and relax with pleasure!
How does it work
Filler – polyurethane foam for orthopedic mattresses and upholstered furniture
Before choosing a sofa, let’s find out what polyurethane foam is. This is a synthetic porous substance consisting of cells filled with air. During its manufacture, the liquid composition foams and then hardens. Polyurethane foam consists of 90% air and has thermal insulation properties. PPU is the same foam rubber, it is used almost everywhere - as a filler for furniture, toys for children, sponges for dishes, washcloths and much more are made from it.
Foam rubber sheet to give softness to products
It is widely used as a filler due to its compactness; this property gives softness and elasticity to the product. It is produced in the form of small sheets - this is foam rubber, and also in the form of quite strong and massive slabs - this is polyurethane foam. If the material is of poor quality, it will quickly become unusable and begin to crumble. Then it needs to be replaced.
Periotec
Completely safe for human health
Periotec
New non-woven fabric - Periotec. It contains: high-quality polyester fibers and impurities. Artificial substances such as corn fiber, bamboo or viscose can be used as impurities. Natural fibers such as wool, coconut, linen or cotton are also used.
Periotec, thanks to its composition, makes the product durable. It has a unique structure, formed from 3 layers. The first and main layer takes on the entire load. The arrangement of the fibers is vertical. Fixation occurs due to high temperature. Subsequent layers strengthen and support the first. The composition does not use toxic substances.
Advantages:
- good for people prone to allergic reactions;
- is an unfavorable environment for microorganisms;
- comfort;
- recovers well with minimal deformation;
- resistance to long-term loads;
- in terms of elasticity and ability to distribute the load, it is not inferior to a block with independent springs;
- lasts a long time;
- breathes well;
- fire resistance
Flaws:
no deficiencies identified
Periotec, as a sofa filler, is good for healthy sleep. But some may find it too harsh. By combining with soft tissues, it becomes less rigid.
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Price policy
It should be noted that polyurethane foam will cost much less than high-quality spring filler. The key point in this matter is the quality of the springs, which is not so easy to find. For example, the Bonnel model belongs to the category of outdated designs, so finding it on the markets is very problematic.
The quality of polyurethane foam is also of great importance for the duration of its service. Therefore, in both cases, saving on buying a sofa with high-quality filling will mean the loss of restful sleep, back pain, and so on.
In addition, in cases where it is almost impossible to look inside the sofa, documentation will be an assistant. A product quality certificate, which is required in every retail outlet, will be a good source of useful information for you. This document fully describes all the features of upholstered furniture of the specific model that you are going to purchase. Structural elements, fillers, material from which the cladding is made - all this is reflected in the certificate
The best springless synthetic fillers
- Many furniture manufacturers prefer to use polyurethane foam because it is an affordable material and easy to work with. There are two types - cast and block. In the first case, special forms are filled with the necessary composition, similar in thickness to sour cream. After it hardens, you get the desired shape. In the second case, the sheets are cut into layers of the required thickness and size and glued together.
Furniture polyurethane foam - an affordable and convenient material for frameless furniture
- Synthetic down. The spiral-shaped fiber, made of silicone, restores its previous shape after compression in a matter of minutes. It has such properties as good quality and reliability. It is mainly used for stuffing furniture pillows, as a filler for backrests and armrests.
Synthetic down - the artificial material of the future
- Sintepon. Non-woven, very lightweight material made from polyester fibers. The substance is hypoallergenic, so furniture with synthetic padding as a filler is used in children's rooms and is suitable for people prone to allergies. They also stuff pillows and use them in making clothes. Eco-friendly material, does not wear out for a long time, is resistant to various fungi, has a water-repellent property, and is safe.
Synthetic winterizer is a material suitable for people suffering from allergies.
- Periotec. Looks like weightless, plump felt, is safe for allergy sufferers, and may contain wool or cotton fibers. The density of such furniture can be normal or high.
PerioTek filler is an elastic, voluminous and durable material
- Quilted jacket. This is, in fact, a layer of cotton wool 5-10 cm thick, located between layers consisting of dense fabric. Furniture with such filling is soft, but there is no elasticity.
Padded padding for the manufacture of upholstered furniture
