SMC Bathroom Wall Panel Moulds

The SMC wall panel mold is a thermosetting composite material compression mold, used to press SMC sheet-like molding plastic under high temperature and high pressure to form waterproof wall panels for bathrooms, mobile shelters, and hotel overall bathrooms, as well as exterior decorative wall panels. It features surface A-level smoothness, a backside with reinforcing ribs, waterproof and flame-retardant properties, and stable dimensions.

SMC wall panel compression mold in reality

 

I. Overall structure composition of the mold

 

1. Upper and lower mold cavities (core forming components)

Upper mold: Front surface of the formed wall panel, mirror polishing + chrome plating treatment, capable of achieving film transfer texture coating, pure color high-gloss surface, surface roughness Ra ≤ 0.4 μm, anti-sticking mold, easy demolding.

Lower mold: Back surface of the formed wall panel, designed with longitudinal and transverse reinforcing ribs grooves, pressing out an integrated reinforcing rib, enhancing the wall panel's bending strength, capable of预留 installation pins, splicing slot structure.

 

2. Temperature control system

Two mainstream heating methods：

· Oil circulation heating： Temperature control is uniform, accuracy ±3~5℃, suitable for large-sized wall panels (1200×2400mm, 1500×3000mm) mass production;

· Electric heating rod heating： Low investment cost, suitable for small and medium batch, small-sized specification molds. Standard forming temperature： 140~160℃.

 

3. Guidance positioning + Exhaust system

· Four sets of precision guide pins and guide sleeves, ensuring no deviation during large plate mold assembly, controlling burrs ≤ 0.1mm;

· Micro-ventilation grooves are set around the mold cavity + optional vacuum exhaust, avoiding bubbles, material shortage, and surface pinhole defects in the sheet.

 

4. Demolding mechanism

Using pneumatic lifting and multi-point pin layout, preventing warping deformation of large-sized wall panels, ensuring the sheet is flat and easily demolded.

 

 

II. Selection of Common Mold Materials (Based on Production Lifespan)

 

die steel	Heat treatment hardness	Estimated cycle life	applicable scene
P20/718H	HRC32~38	30~50 Ten thousand times	Small and medium-sized batches of conventional civilian wall panels, the best choice for cost-effectiveness
2738	HRC34~40	50~80 Ten thousand times	High-frequency mass production, export orders, A-level appearance requirements
H13 hot work steel	HRC48~52	800,000 to 1,000,000 + batches	Large-scale press machine, high-pressure mass production, long-term continuous production

 

Surface treatment: cavity mirror surface polishing + hard chromium electroplating 5-10 μm. It is wear-resistant, corrosion-resistant, and can be repeatedly demolded without scratching the paint surface.

 

 

III. Regular Process Parameters and Production Flow

 

1. Core forming parameters

Forming pressure: 800 - 2000T hydraulic compression press

Mold temperature: 145 - 155℃

Holding and curing time: 120 - 200 seconds

SMC material feeding: Cutting, weighing, and laying materials, and simultaneous placement of heat transfer decorative film. The decorative surface is not peeled off during one-time forming.

 

2. Complete production process

1. Mold preheating, spraying internal/external release agents on the cavity

2. Cutting of SMC sheets, precise weighing, laying down the mold, adhering the decorative film

3. Closing the mold → High-pressure locking → Constant temperature holding and curing

4. Opening the mold, using multiple pneumatic actuators for ejection and release

5. Edge trimming of the wall panel, removing burrs, inspection and storage

SMC molding principle

 

 

IV. Key design points of SMC wall panel molds

 

1. Demolding angle: Flat surface ≥ 1°, reinforcement position ≥ 1.5°, to prevent surface scratches and reinforcement breakage;

2. Reinforcement layout: Cross-intersecting grid reinforcement, the thickness of the reinforcement is generally ≥ 0.8 times the wall panel thickness, which reduces weight and prevents deformation, and the installation reinforcement positions are still retained after cutting;

3. Wall thickness uniformity: The conventional wall thickness of the wall panel is 3-5mm, the wall thickness difference is controlled within 0.5mm, to avoid local uneven curing and warping;

4. Mold design: Use a flat mold, combined with peripheral overflow grooves + exhaust grooves, to control burrs and reduce the workload of post-processing trimming;

5. Integrable pre-drilled screw inserts, during pressing, directly form and install the threaded holes, no need to drill holes later.

 

 

V. Main Application Scenarios

1. Complete bathroom SMC waterproof wall panels, shower room wall panels, bathroom ceilings;

2. Portable hospital, container dormitories, temporary resettlement housing prefabricated interior wall panels;

3. Hotel apartments, homestay integrated bathroom wall panels;

4. Rail transit, ship interior anti-corrosion wall panels, industrial anti-corrosion exterior wall panels.

 

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