Front Flap Hollow Blow-molded Seat
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Front Flap Hollow Blow-molded Seat

Front-Flap Hollow Blow-Molded Seat feature a seat that flips forward and folds up. It unfolds to accommodate spectators and folds down at the end of the event, creating a user-friendly space for crowd evacuation. The seat and backrest are hollow-molded, featuring smooth corners and an ergonomically designed curved backrest. Internal ribs enhance strength and load-bearing capacity. The front-flap hollow blow-molded seat's seat and backrest are connected by cast aluminum alloy, ensuring smooth flipping and resistance to loosening even after extended use. This design can be used for both fixed and retractable seating, and its lightweight design facilitates installation.
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Product Introduction

The production process for front-flap hollow blow-molded seats is relatively complex, involving raw material preparation, blow molding, assembly, and quality inspection. This is the production process for standard seats. For custom requirements, we will first discuss the process with the user and tailor the seat to their specific requirements.

 

Raw Material Preparation: We select high-quality high-density polyethylene (HDPE) and, as required, add anti-aging agents and color masterbatches to ensure weather resistance, impact resistance, and color stability.

 

Blow Molding: The raw material is heated in an extruder, extruded into a mold, and the hot parison is placed in a mold. Compressed air is introduced to inflate the parison until it fits snugly into the mold cavity. The air pressure cools and sets the shape. After the air is released, the mold is opened and the blow-molded part is removed, revealing the general shape of the seat.

 

Assembly: Because the front-flap hollow blow-molded seat can be flipped during use, the seat and back panels are produced separately. They are then assembled using metal brackets to ensure they do not loosen during use.

 

Quality Inspection: Simulate the flipping operation during use to confirm that the stability and load-bearing capacity meet the requirements before shipment.

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The quality of front-flap hollow blow-molded seats is essential to ensure their long-term use. Therefore, we conduct quality inspections immediately after purchasing, focusing on material properties, structural strength, and performance characteristics. Below are detailed inspections: 

1

Raw Material Inspection: Infrared spectroscopy is used to verify the use of high-density polyethylene materials to avoid the use of recycled materials, which can reduce performance during use. UV aging testing and tensile strength testing are also included.

2

Hollow Structure Testing: An ultrasonic thickness gauge is used to check the thickness deviation of the seat and backrest to avoid excessive thinness, which may cause cracking during use.

3

Load Testing: A 750N vertical load is applied for one hour, with deformation ≤ 2mm and no cracks or structural failure. The frame is then subjected to a 1000N horizontal pull for 10 minutes without loosening.

4

Dynamic Fatigue Testing: A cyclic flip test is performed, ensuring smooth and unstuck flipping.

We recommend purchasing front-flap hollow blow-molded seats from professional manufacturers, who ensure quality and provide comprehensive after-sales service.

 

What additives are used throughout the production process of our front-flap hollow blow-molded seats?

1

Tougheners: Enhance the impact resistance of the HDPE material, ensuring it can withstand frequent flips and maintains an elongation at break of 400% or higher.

2

UV inhibitors: Enhance resistance to UV aging, ensuring it will not fade even after 10 years of use.

3

Antioxidants: Prevent oxidative degradation during the high-temperature blow-molding process, ensuring material stability.

These additives ensure the longevity of our front-flap hollow blow-molded seats. We will continue to innovate throughout the production process to produce even higher-quality products.

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Detailed pictures of the grandstand seats

 

 

Grade I polyethylene

Polyethylene is a milky-white, semi-transparent, waxy solid with a molecular weight of 100,000 to 300,000. Its translucency distinguishes it from completely transparent PET and opaque PP, and it has a waxy surface. During use, color masterbatch is added to achieve uniform coloring, and the resulting color is very stable and resistant to fading over long-term use. The waxy surface does not easily attract dust, facilitating future maintenance.

Its high molecular weight ensures it can withstand significant pressure and impact, preventing the seat from easily deforming or breaking during use. When the seat is impacted, it undergoes slight deformation to absorb energy, thus preventing permanent deformation even when run over.

Key performance advantages of seats made from Grade I high-density polyethylene raw materials:
Mechanical strength: Tensile strength of approximately 20-30 MPa during use;
Chemical resistance: Resistant to acids, alkalis, and organic solvents, but should not come into contact with strong oxidants;
Barrier properties: Low permeability to water vapor and oxygen;
High strength: Crystallinity as high as 80%-90%, resulting in excellent tensile strength and hardness, suitable for high-pressure environments.

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Buyers from Russia, Kyrgyzstan and Kazakhstan are very interested in our seats.Come to the factory to sign a contract and formulate a plan.

The grandstand steps are constructed with 17mm laminate board, 1.2mm anti-slip flooring, and aluminum alloy decorative edging. This gives the steps both high strength and an aesthetically pleasing surface, facilitating cleaning. The surface layer is secured to the grandstand's auxiliary support frame with rivets, ensuring the high strength and structural stability of the movable grandstand.

Guardrails are installed on both sides and powder-coated. The guardrails are 1000mm high and constructed of steel. Their horizontal static load capacity should be able to withstand: a load of 60kg/m² for 30 seconds, with no significant permanent deformation after unloading. Their vertical static load capacity should be able to withstand: a load of 100kg/m² for 1 minute, with no significant permanent deformation after unloading.

Front flap hollow blow-molded seat
warehouse

The warehouse for front flap hollow blow-molded seats can be categorized and stored according to their condition, divided into an inspection area, a qualified area, and a shipment area. Finished products undergo inspection before leaving the factory; therefore, they first enter the inspection area, and once they pass inspection, they are transferred to the qualified area. When a customer purchases seats, the required seats are assembled and placed in the shipment area to ensure smooth delivery.

Especially for seats with metal parts, they should be separately categorized and equipped with moisture-proof boxes to prevent rust from affecting later installation. Desiccants can also be placed in this area to further control local humidity. Regular inspections of the inventory are necessary to check the smoothness of the flip-up mechanism and for scratches on the surface; any problems must be repaired immediately.

There are two machines in the old factory and two domestically advanced blow molding machines in the new factory.

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Our company provides free design drawings and solution development services for front flap hollow blow-molded seats. The front-mounted structure involves details such as smooth opening and closing, load-bearing stability, and locking adaptability. The solution includes the fixing method to the grandstand floor, the space after the folding panel is retracted, and after-sales maintenance guidelines. Different adjustments will be made for different usage scenarios.

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