A. The foaming resin, foaming agent adhesive resin (making the finished product have adhesive property) are mixed together;
B. Foam processing. The foamed sponge was prepared by mixing 80 parts of vinyl acetate (EVA), 20 parts of APAO Pt 3385, 20 parts of Azodicarbonamide, 19 parts of CaCO 0.6 parts of diisopropyl peroxide. The foam sponge was prepared by blowing the closed cell with mechanical force. The density (d) is 0.028 g / cm the 25% compression hardness is 1.9 kPa.
Just like foaming, the same materials different manufacturing processes will make different things
Pu sponge mainly includes polyester polyether, which can be sliced rolled. It can also be processed according to customers' requirements, such as hot pressing blasting. Pu sponge has the characteristics of heat preservation, heat insulation, sound absorption, shock absorption, flame retardant, anti-static good air permeability, so it involves various industries, including automobile industry, battery industry, cosmetics industry, bra underwear manufacturing industry high-grade furniture manufacturing industry.
Selection of advantages disadvantages
1. When choosing a sponge, its tactility elasticity are the primary factors to judge. It should feel soft malleable.
2. In addition, the most practical way to distinguish is to fold the sponge in half rub each other. If you don't rub it a few times, it's time to get rid of it.
Folding chemical sponge
Polyurethane soft foam rubber, polyurethane is the most common polymer material in life, widely used in the production of various "sponge" products. elastic materials for shock absorption friction resistance, such as soles, tractor tank track substrates.
Folding industrial sponge
There are many kinds of sponges used in industrial production, such as foam cotton, shaped cotton, rubber cotton, memory cotton, etc.
This material cotton is made of polyurethane, mixed with various additives such as foaming agent, pressing agent into a simple mould to heat up. It is suitable for swivel chair, sofa cushion back cotton, a small amount of armrest is also made of shaped cotton. The material density is 55 ~ 60, its elasticity is in line with the relevant national standards. The elastic hardness of sponge can be adjusted according to different parts of the product. Generally, the base cotton has higher hardness higher density, followed by the back cotton, the pillow cotton is softer.
This material is foamed with polyether, just like foamed bread. The foamed cotton can be foamed by mechanical equipment manually surrounded by wood. The foamed cotton is like a square loaf. After slicing with slicing machine, the thickness of the foam cotton can be adjusted according to different requirements. Generally, 25 ~ 28KG / m3 is used for cotton, 20 ~ 22kg / m3 for others. Although the soft hardness of sponge is directly related to density, it is also related to different additive formulations. Therefore, the industry is divided into high elasticity, grey super, black grey super soft cotton. Product design use should be based on different shapes structures for reasonable scientific collocation, generally divided into upper, middle low three parts with different elasticity density of sponge. There is a kind of material called fire-retardant cotton (flame-retardant cotton) in the sponge. In fact, before the foam is foamed, fire-retardant agents, such as chlorine bromine, are added to the material formula to make the sponge produce strong smoke when it is on fire, which plays a role in flame retardant.
One of the sponges, which is foamed with natural latex as the main material. It has the characteristics of rubber, excellent elasticity, good resilience no deformation, but its price is high, 3 ~ 4 times higher than that of foam cotton.
Recycled sponge, the International English name bonded foam, is a new product a global sponge treatment method. Recycled sponge belongs to the recycling of industrial waste of polyurethane products. Its use value is no less than sponge, it is made of industrial sponge scraps, crushed, stirred, glue steam sterilized, sterilized, deodorized compressed. the production cost, the production cost is greatly reduced. It has good elasticity, good resistance, no deformation no odor. It can be made into products with various densities according to the needs of customers. The high density high elasticity regenerated sponge has a density of more than 60 kg / m3. It has the characteristics of high-efficiency flame-retardant, good tensile strength, large elasticity no deformation. After sterilization by high-pressure steam, it is environmentally friendly economical Use. It can be widely used to make sofas, mattresses, boss chairs, sports equipment, such as sponge gym mats, sponge fitness mats, sponge wrestling mats, sponge car cushions other products, which have been widely accepted by countries around the world.
The broken sponge in the recycled sponge is the small sponge pieces broken particles left after the industrial cutting, which has passed the quality inspection reached the standard. At the same time, the small pieces of sponge are easier to shape have longer function.
In the recycling sponge processing system, the folk recycled sponge is allowed to be used in the recycling sponge processing process, the used sponge flavor is very obvious. The taste of recycled sponges on the market is significant in part because of the use of used old sponges. Therefore, good recycled sponge consumers can rest assured to purchase use. In various fields of national economic construction people's life, the annual output of polyurethane products in the world is close to 7 million tons. A large amount of waste materials will appear in the production process after consumption use of such products: due to different production methods, 8% - 15% of corner waste will be produced; In addition, polyurethane products over the service life, its performance will be greatly reduced scrapped, all these wastes must be effectively recycled reused.
Because these sponge scraps can't be thrown directly into nature, nature can't be natural either