Children are God's best gifts for parents. Faced with purity like a white baby, parents always hope to give them the best protection and devote all their love to them. As children grew up day by day, they began to touch the world slowly, and the dangers lurked around them at the same time. When I was little, I was particularly afraid of being lonely. I saw other small partners learning to ride a bike. I also secretly pushed a bicycle higher than me to join them. As a result, I could imagine the fierceness that I fell. In this accident, I only remember the top of my head that was mixed with white hair when I was disinfected, and when she looked at me, I felt distressed and guilty. Say something about the children's learning to ride a bike today. Let us prevent problems, have less pain, and have more joy.
Parents need to know that the age of a child suitable for learning a two-wheeler is 4 to 6 years old. For safety, you can learn from a two-wheeled vehicle with auxiliary wheels. Regarding the choice of road, it is recommended that children under the age of 10 cannot control the car freely, and are not suitable for riding on the hillside or on a road with heavy traffic. It must be monitored that he can only play in the park or on the empty field, but also during the day. It is important to choose a suitable helmet for your child. The size should be appropriate. When he puts on, the helmet does not turn to the front or side as the head turns. When choosing, let him try it on. A suitable helmet should only fit one finger between the child's chin and lace. We also routinely check the handlebars and axles every month to see if the wheels sound normal when the brakes are tightened.
In early childhood, because the cartilage between the two vertebrae of the spine is particularly developed and physiological bending is not yet fixed, the bones of young children are relatively soft and elastic, and are easily deformed. Therefore, when riding a stroller, the height of the seat must be adjusted properly to teach the child a correct posture and avoid deformity of the spine. Cycling often requires the coordination of the wrist bones and muscles. However, the child's wrist bones are composed of soft tissues, which are soft and easy to fold. Therefore, wrist injuries should be avoided during activities. Infant pelvic development is not mature, should pay particular attention to the action of getting on and off. And when picking a rider's field, be careful that the ground is not too hard so that the bones that make up the hip bone are not transposed. In particular, girls should be more protected so as not to affect their development.
Riding a baby carriage is a good way for young children to exercise. Proper and scientific exercise can promote the development of children's bones and muscles. However, because the growth and development of young children are not yet fully completed, parents need to pay special attention not to allow children to be injured in cycling. Finally, before each child's cycling activity, parents should first check whether the baby carriage is damaged and effectively avoid accidents. No matter what we do, we should all be moderate, and it is best to stay on the spot. After all, our early days just want our children to have a happy and carefree childhood.
EVA resin is an ethylene-vinyl acetate copolymer, and the general vinyl acetate (VA) content is 5% to 40%. Compared with polyethylene, EVA is widely used in foam shoes due to the introduction of vinyl acetate monomer into the molecular chain, which reduces high crystallinity and improves flexibility, impact resistance, filler compatibility and heat sealing performance. Materials, functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields. Generally speaking, the performance of EVA resin mainly depends on the content of vinyl acetate on the molecular chain.
Main purpose:
1. It is widely used in the fields of foamed shoe materials, functional shed films, packaging molds, hot melt adhesives, wires and cables and toys.
2. EVA products with vinyl acetate content of 5% ~ 10% are elastic films;
3. EVA with vinyl acetate content of 20-28% is mainly used for hot melt adhesive and coating products;
4. The content of vinyl acetate is 5% ~ 45%, and the main products are films (including agricultural films) and sheets, injection molding, molding products, foaming products, hot-melt adhesives, etc.
(1) Foamed shoe material. Shoe material is the main application field of EVA resin in China. In the EVA resin used for shoe materials, the content of vinyl acetate is generally 15% ~ 22%. Because EVA resin blended foamed products have soft, good elasticity, chemical corrosion resistance and other properties, they are widely used in the soles and interior materials of middle and high-end travel shoes, mountaineering shoes, slippers and sandals. In addition, this material is also used in the fields of soundproof panels, gymnastic pads and sealing materials.
(2) Film. The main purpose of EVA film is to produce functional greenhouse film. The functional shed film has high weather resistance, anti fogging and thermal insulation performance. Because polyethylene has no polarity, even if a certain amount of anti fogging agent is added, its anti fogging performance can only be maintained for about 2 months; The shed film made by adding a certain amount of EVA resin not only has a high light transmittance, but also has a great improvement in the anti fog drop performance, generally more than 4 months. In addition, EVA can also be used to produce packaging film, medical film, laminated film, casting film, etc.
(3) Wires and cables. With the continuous development of computer and network engineering, halogen-free flame retardant cables and silane crosslinked cables are more and more used for the safety of computer rooms. EVA resin is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane crosslinked cables due to its good filler inclusion and crosslinkability. In addition, EVA resin is also used to make the sheath of some special cables. The content of EVA resin used in wires and cables is generally 12% ~ 24%.
(4) Toys. EVA resin is also widely used in toys, such as children's wheels and seat cushions.
(5) Hot melt adhesive. The hot melt adhesive with EVA resin as the main component is very suitable for automatic assembly line production because it does not contain solvent, does not pollute the environment and has high safety. Therefore, it is widely used in wireless book binding, furniture edge sealing, automobile and household appliance assembly, shoe making, carpet coating and metal anti-corrosion coating.
(6) Others. EVA resin is also widely used in ink, luggage, wine bottle cushion cover and other fields. It is estimated that the consumption of EVA resin in these areas is not less than 15 kt.
EVA Resin for Foam,EVA Resin Granule,EVA Resina,Ethylene Vinyl Acetate
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