EN
GUANLIN bag in bag pre-filter solution, double layer dust collection bag for extended service life in heavy dust loads.
Double layer bag-in-bag filter bags with an inner pre-filter that intercepts coarse dust before it reaches the main felt, extending service life in heavy loading baghouses.
Description
When a baghouse carries a heavy coarse fraction, the main felt absorbs the abrasive load and wears through long before its filtration capacity is used up. The bag-in-bag approach adds an inner sacrificial layer: coarse particles are intercepted there, the outer felt only handles the fine fraction, and the whole assembly lasts considerably longer than a single-layer bag in the same duty.
Why Choose GUANLIN Bag-in-Bag Solutions
- Two-stage filtration — inner layer catches coarse dust before it abrades the main felt.
- Extended service life — the outer bag sees a lighter, finer load.
- Replaceable inner layer — swap the pre-filter alone when consumed.
- Retrofit friendly — fits existing cages and tubesheets.
- ≥99.9% efficiency — combined layers capture down to 1 μm.
- Custom sizing — Ø115–200 mm × 1000–6000 mm.
Application Scenarios
Woodworking with shavings and dust
Planer chips are intercepted before they abrade the main felt.
Cement and mineral transfer
Coarse clinker plus fine dust spread across two stages.
Powder conveying receivers
Batch slugs of coarse material followed by fine airborne dust.
Foundry sand handling
Abrasive sand captured by the inner layer.
Recycling and waste transfer
Variable dust loads levelled out by the two-stage design.
Overloaded baghouses
Where air-to-cloth ratio is marginal, extended life buys time.
Our Factory
GUANLIN has manufactured filtration products in Dongguan since 2003, operating a 6,000 m² plant with automated filter bag sewing lines, automated singeing equipment, cage welding systems and pleated filter production lines. Products are exported to Singapore, Vietnam, Malaysia and other markets, with ISO 9001 and ISO 14001 certified quality management.
Product Specifications
| Item | Specification |
| Construction | Inner pre-filter + outer main bag |
| Media | Polyester needle felt |
| Temperature | 130°C continuous / 150°C peak |
| Efficiency | ≥99.9% (particles ≥1 μm) |
| MOQ | 10 pcs |
FAQ
Q1. How is this different from a normal bag?
It carries an inner sacrificial pre-filter layer.
Q2. Can the inner layer be replaced alone?
Yes.
Q3. Does it affect airflow?
Pressure drop is slightly higher; check fan margin before retrofitting.
Q4. MOQ and lead time?
10 pcs, 7–15 days.
Key Specifications
- Construction: inner pre-filter + outer main bag
- Media: polyester needle felt
- Temperature: 130°C continuous
- MOQ: 10 pcs
