Huizhou Ramson Technology Co., Ltd. is a professional ISO-certified modern linen fabric living room sofa factory in China, providing modern furniture solutions for commercial and residential contract projects. As a direct manufacturing partner for buyers searching for modular sofa manufacturers and suppliers in China, we offer factory-direct wholesale pricing, complete OEM/ODM customization, strict quality control, and reliable support for global projects.

We Build This Sofa

JF-5155 is a modular sofa we manufacture specifically for serviced apartment and project procurement. Below is exactly how our factory builds it - the raw materials, the internal construction, and the QC steps we run before it ever leaves the workshop.

We use a poplar multi-layer plywood frame, reinforced with corner brackets and assembled with a combination of corner-brace fixing and pneumatic staple/nail-gun joints. This is the structural approach we've relied on for years on serviced apartment projects - it holds up under the frequent, multi-person seating load that project sofas see far more than residential pieces.

Frame materials and tolerances: the structural frame is built from kiln-dried poplar and eucalyptus hardwood with a controlled moisture content of 8-12% - dry enough to prevent warping in sea containers, yet not so dry that the timber becomes brittle. Main load-bearing rails are 40 x 40 mm solid hardwood; cross-braces and seat-base rails are 30 x 30 mm. Corner reinforcement blocks are 90 x 90 mm, glued with white PVA wood adhesive, dowel-joined, and further secured with steel L-brackets and pneumatic staples.

Load rating: each seat position is tested to a 150 kg static distributed load (equivalent to EN 12520 commercial furniture standard), and the frame passes 100,000-cycle durability testing without loosening, squeaking, or structural failure. The KD (knock-down) structure uses bolts and eccentric cam locks - on-site assembly needs only the supplied Allen key, and modules can be disconnected and reconnected repeatedly without joint wear.

The seat base uses 3.8mm S-shaped flat springs combined with pocket spring cushioning and a webbing base underneath. This layered support spreads seating pressure across the frame and reduces long-term sagging risk - a common failure point on lower-spec project sofas.

• Seat cushion (main foam): 28kg/m³ foam - comfortable seating feel while resisting compression under daily project-level use.
• Base & side-panel filling: 23kg/m³ foam.
• Backrest & support layers: 18kg/m³ foam..

We support adjusting foam firmness for project requirements - density can be tuned to the region or the client's seating preference.

Every incoming batch of foam goes through incoming inspection at our factory - we verify the density spec before it's approved for cutting. We don't run production on generic, unverified foam.

Density and lay-up detail: the seat cushion uses 28 kg/m3 high-resilience (HR) polyurethane foam as the main comfort layer; the base and side panels use 23 kg/m3 support foam; the backrest and lumbar layers use 18 kg/m3 softer foam. Seat edges are wrapped with 3-inch (76 mm) high-density foam rails to prevent cushion roll-off and keep the seat edge shape crisp after years of use.

Fire-retardant rating: standard foam meets GB 8410 A-0 (China interior materials fire-retardant standard) with cigarette and match ignition resistance. For North American projects we can upgrade to CA117-2013 (California Technical Bulletin 117) and for European/hospitality projects to BS 5852 Crib 5. Physical test reports from SGS or INTERTEK are provided on request. Foam resilience is >=40% and compression set <=5% after 70,000 cycles, measured in our incoming-inspection lab.

Legs: Slim black metal legs - a stable, minimal base that fits current apartment living-room styling.

JF-5155 is built as a freely combinable modular sectional sofa: modules can be arranged to fit different apartment living-room layouts, and individual modules can be reordered separately after the initial project delivery. We manage fabric by production batch, which keeps visible color difference to a minimum even on multi-year reorders.

JF-5155 is fully OEM/ODM customizable for project procurement. Module mix: choose from 1-seat, 2-seat, 3-seat, chaise, corner, and ottoman modules - they click together via the hidden linking system, so the same SKU can be configured for studio, 1-bedroom, or 2-bedroom apartment layouts.

Dimension tuning: overall length can be adjusted +/-10 cm from the standard 200 cm; seat depth ranges 55-65 cm to suit regional sitting preferences. Leg finish: slim black metal legs are standard; brushed stainless steel or natural oak legs are optional. For common-area units, we can integrate a side console with USB-A / USB-C charging ports and a drink holder.

Branding and after-sales: embroidered logo on the cushion or a woven label under the seat is available from MOQ 30 sets. Removable, washable covers are stocked as spares, and replacement modules can be reordered individually after the initial delivery - critical for serviced-apartment operators who need to refresh one unit without replacing the whole sofa.

Packaging and lead time: each KD module is bagged in a non-woven dust sheet, corner-protected with expanded EPS foam, and packed in a 5-layer export carton; carton dimensions and CBM are listed in the specification table above. Standard lead time is 30-45 days from deposit confirmation and pre-production sample approval. Every production batch goes through incoming material inspection, frame and spring assembly QC, upholstery check, and a 24-hour sit-in hold before packaging, so the units you receive match the approved sample.

• Fabric passes SGS abrasion-resistance testing.
• Foam meets the GB 8410 A-0 fire-retardant standard.
• Product R&D and in-house QC are led by our founder, Gigi Xie, with 17 years of sofa manufacturing and foreign trade project experience.

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