1218（2）

Product size requirements:

Technical requirements:

1. The chair is designed and manufactured according to the principles of ergonomics and morphological aesthetics. The curvature of the back cushion and seat cushion fully conforms to the curve of the human body. The seat height and seat depth are reasonable, the sitting feeling is comfortable, the seat cushion can automatically return to its original position, and the appearance of the chair is simple and beautiful.

2. The basic center distance of the seat is: 560±10mm, the side depth of the seat with the seat bag opened is: 705±10mm, the side depth of the writing board with the seat bag opened is: 795±10mm, the chair height is: 1040±10mm, and the minimum row distance is: 900mm.

3. Under the premise of ensuring the comfort of the audience, the back cushion height shall not exceed 1040mm to increase the sound reflection area of ​​the chair backboard and improve the sound absorption of the seat; sound-absorbing holes shall be made on the seat bottom plate as needed to keep the sound absorption of the seat as consistent as possible at different occupancy rates.

4. Hidden anti-terrorism writing board: The writing board is fixed by mechanical high-strength bolts, which makes the connection parts of the writing board stronger and stronger, and will not loosen. The recovery mechanism is linked by a damping gas rod. The armrest and the writing board are tilted upward by 6.5 degrees to ensure the natural state of writing. The writing board has a built-in muffler function when it is opened and recovered, and there should be no rebound force and noise. The writing board support plate is made of high-quality aluminum alloy material and is die-casted by a mold. The size specifications of the aluminum alloy support plate are: length: 201±10mm, width: 84±10mm, thickness: 21±10mm. The rotating shaft sleeve of the writing board is made of brand-new high-quality PP+25%GF glass fiber reinforced material and is molded by mold-integrated injection molding. The writing board panel is made of high-quality high-density hardwood and is molded by mold pressure. The size specifications of the writing board panel are: length: 318±10mm, width: 242±10mm, thickness: 12±10mm

5. The seat fabric is made of high-grade knitted fabric (the type of fabric is subject to the final choice of the owner). The seat fabric has strong permeability, is elastic, and has been treated with flame retardant and anti-static treatment. The color fastness to acid and alkali sweat reaches level 4-5, the color fastness to dry rubbing reaches level 4-5, the bursting strength is ≥1100N, the anti-pilling performance is level 4-5, and the flat abrasion is ≥80,000 times; the formaldehyde content is <5mg/kg, the extractable heavy metal content does not exceed the standard, and the decomposable carcinogenic aromatic amine dyes (24 types) do not exceed the standard.

6. The seat sponge is made of high-density environmentally friendly polyurethane shaped sponge raw materials from BASF, Bayer, DuPont and other German companies, and is a high-quality sponge that is molded by cold-setting and foaming in one piece. The back sponge density is 45-50Kg/m³, the seat sponge density is 50-55Kg/m³, the rebound rate is ≥50%; the tensile strength is ≥120kpa, the tensile strength after dry heat aging is ≥120 kpa, the 75% compression permanent deformation is ≤8%, the elongation is ≥120%; the tear strength is ≥2.0N/cm, and the formaldehyde release is ≤0.05mg/㎡h. The seat sponge size specifications are length: 480±10mm, width: 460±10mm, height: 150±10mm, and the sponge density is 50-55KG/M3; the back sponge size specifications are length: 750±10mm, width: 460±10mm, height: 140±10mm, and the sponge density is 40-45KG/m3. The unique formula makes the foam antibacterial and can effectively inhibit Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli.

7. Aluminum alloy feet: Made of high-quality aluminum alloy material, die-casted by a mold, with a built-in anti-terrorism writing board that can be opened and recycled, and enough space for the writing board. The aluminum alloy armrest is ≥60mm wide and weighs ≥2.8KG. The surface of the aluminum alloy feet is designed with a curved surface to ensure the full beauty of the product. The left and right sides are decorated with medium-density fiberboard covered with thin cotton and cloth. A fixed plastic cup holder can be optionally installed at the bottom of the seat feet. The dimensions of the aluminum alloy feet are: length: 676±10mm, width: 404±10mm, thickness: 60±10mm.

8. Seat armrest cover: Made of high-quality beech/rubber wood/teak and other woods, the surface is coated with 5 layers of high-end environmentally friendly polyurethane paint. The formaldehyde emission meets the E1 level requirements. It has a curved shape and does not deform or crack. The armrest size specifications are: length: 380±10mm, width: 60±10mm, thickness: 30±10mm.

9. The seat iron frame is made of high-strength high-quality carbon steel plate by stamping, bending and welding. At the same time, 5 S-shaped springs with a diameter of 2.5mm are added to ensure the comfort, firmness and long-term use of the seat without trouble or abnormal noise. Dimensions: length 420±10mm, width 410±10mm, height 56±10mm.

10. The seat adopts hydraulic rod damping and spring return mechanism, with two-stage buffering, first fast and then slow, so that the seat can return to its position within 3 seconds, with escape silencing function, and rubber pads are added to the collision part of the seat to prevent collision and reduce noise, so that the seat opens without noise, returns slowly without impact, and the noise is as low as A sound level (≤35dB), with precise positioning, low failure rate, and service life ≥300,000 times. The return speed can be adjusted according to the needs of the site, and the return mechanism can be maintained with the service life.

11. Seat backboard: The outer board is made of high-quality high-density hardwood multi-layer board, which is molded by cold pressing and injection molding. It does not fade and resists deformation. The specifications of the back outer board are: length: 740±10mm, width: 495±10mm, thickness: 15±10mm. The dimensions of the seat outer board are: length: 440±10mm, width: 425±10mm, thickness: 12mm±10mm. Back inner board: It is made of high-quality plywood and molded by mold bending. The appearance is arc-shaped, beautiful and curvaceous. The dimensions of the back inner board are: length: 715±10mm, width: 450±10mm, thickness: 6mm.

12. All metal steels are made of high-quality cold-rolled plates or profiles, and the welded parts are welded by robots, with high welding quality, smooth weld marks and no welding slag. The surface of metal accessories such as seat frames, seat supports, armrest brackets, and writing board brackets should be treated with anti-rust treatment, and then electrophoretic 18-micron coating, anti-corrosion primer protection, and then epoxy resin 30-micron spraying, to ensure that the paint film will not rust after 400 hours of salt spraying or 100 hours of salt bath corrosion resistance test, and the paint film adhesion should be no less than level 2.

13. The seat is firmly fixed to the ground with steel pressure-explosive anchor bolts, and an ABS plastic sealing cover is specially provided to seal the structure of the pressure-explosive anchor bolts. The appearance is beautiful and dust-free, and it is easy to clean. The anchor bolts have passed the neutral salt spray test, 120 hours of test ≥ 9 levels, and there is no peeling, rust, burrs, etc. on the surface of the electroplating layer.

14. It is required to provide a set of single-seat chair samples; provide a set of aluminum alloy foot assembly samples for built-in anti-terrorism writing board, the aluminum alloy foot width ≥ 60mm, weight ≥ 2.8KG, the armrest cover and writing board are tilted upward 6.5 degrees to ensure comfortable and natural writing. The writing board must have a muffler function when opened and recycled, and there must be no rebound force and noise; provide a 3D model structure diagram of the product. If the samples are not provided as required or the samples provided do not meet the requirements, no points will be awarded.