Breaking the Linear Limitations of Panel Furniture: A Detailed Analysis of Core Stock Preparation Processes for Two Types of Special-Shaped Panels

Conventional panel furniture mostly adopts regular flat panels. Nevertheless, demand for curved and lightweight custom furniture keeps rising. Two special-shaped stock preparation technologies — hollow core panels and multi-layer laminated bent panels — have become core techniques for furniture factories to create distinctive styling. This article systematically analyzes the structure, production workflow and applicable scenarios of the two processes.

I. Manufacturing Process of Lightweight Hollow Core Panels

To resolve the pain points of excessive self-weight and high raw material costs of solid thick panels, the industry widely applies hollow structures as a substitute. They are mainly divided into double-faced hollow core panels and single-faced thickened panels.

Distinction Between the Two Structures

Double-faced hollow core panels: Decorative veneers on both sides with consistent appearance, suitable for double-view cabinets and decorative tabletops.Single-faced thickened panels: Veneer only on the front surface with no aesthetic requirements for the back side, mostly applied against walls or concealed thickened components.

Frame and Core Filler Design

The frame can be made of solid wood, particleboard, multi-layer plywood and other wood-based panels. It is preferable to adopt uniform materials to avoid warping and deformation caused by temperature and humidity fluctuations. Soft timber is recommended for solid wood frames with narrow width control. The frame follows symmetrical design principles, and joints can be fixed by tongue-and-groove connections, dowels or staples.Internal fillers include slats, grid strips, corrugated sheets and honeycomb core. Thanks to light weight and low cost, honeycomb core is the most mainstream core material for mass-produced hollow panels.

Lamination Production Workflow

The surface veneer panels are cut about 2 mm larger than the frame. During assembly, brads are used for temporary fixing to prevent dislocation. Forming can be achieved via cold pressing or hot pressing:

• Cold pressing: Multiple layers can be pressed simultaneously with low equipment investment; the preferred option for small and medium batch production.

• Hot pressing: Higher production efficiency and suitable for large-volume orders. Pressing temperature and duration shall match the adhesive type and panel thickness.

Key Processing Points for Thickened Panels

Thickened edge strips shall adopt the same material as the substrate. Thickening treatment is carried out after veneering and sanding with machining allowance reserved. Positioning jigs are used during processing, and PVA white glue is adopted for cold pressing shaping. Stacked panels must be well aligned to avoid dislocation defects.

II. Multi-Layer Veneer Laminated Bending Process

Laminated veneer bending is the mainstream process for curved chair backs, streamlined tabletops and special-shaped wooden components. Multiple glued veneers are assembled, placed into moulds and hot-pressed under pressure to form smooth curved surfaces integrally, greatly expanding the styling boundaries of furniture.

1. Advantages and Disadvantages of the Process

Advantages

• Thin veneers are easy to shape with low requirements on wood bending performance; the process is simple and suitable for mass production.

• Arbitrary complex radii can be customized with smooth and attractive curved surfaces, compatible with all kinds of creative furniture.

• Thin wood veneers are fully utilized to substantially improve timber utilization.

• Multi-layer laminated structure boasts higher strength than solid wood; finished products feature stable dimensions and resist deformation and cracking.

Disadvantages

• Higher adhesive consumption during processing. Glue lines remain visible on panel edges, imposing certain requirements on subsequent finishing processes.

2. Standards for Pre-selection of Veneers

Raw materials can be rotary-cut veneers, sliced veneers, thin fibreboards and more. Core veneers prioritize strength and elasticity with loose appearance requirements; surface veneers select premium wood veneers with attractive grain and moderate hardness. The moisture content of all veneers is controlled within 6%–12%, and machining allowance is reserved during cutting.

3. Specifications for Gluing and Assembly

The glue spread rate is adjusted according to timber species, panel thickness and surface smoothness: less glue for hardwood, thin veneers and smooth surfaces; moderately increased glue for softwood, thick panels and rough surfaces. Excessive or insufficient glue will reduce bonding strength.Three grain arrangement modes are available for veneers: parallel, cross and mixed layout. Grain direction makes no difference for fibreboard assembly. Veneers and fibreboards can also be stacked in combination to optimize overall panel performance.

4. Hot Press Forming and Post Curing

Unidirectional / multi-directional presses cooperate with moulds for compression shaping. Pressure, temperature and holding time are determined by panel thickness, timber species and styling; hot pressing is the mainstream industrial practice.Demoulded bent panels cannot undergo deep processing immediately. A conditioning cycle is required for stress relief and moisture equalization, effectively avoiding later springback and twisting defects.

Conclusion

Linear styling can no longer satisfy modern home aesthetics. The lightweight hollow panel process and multi-layer laminated bent panel forming technology address two major production demands: panel weight reduction & cost control, and curved surface shaping. Furniture manufacturers can flexibly adopt the two processes based on product positioning and order scale, enrich their product styling portfolio and develop differentiated panel furniture.