Hi there,

 

As the original manufacturer of the ZDzmj-IV-L Paint Brush Head Machine, we’ve supported hundreds of client sites worldwide. We often see avoidable tuning issues stem from mismatched material parameters, not machine performance. Below are practical, field-tested tips from our senior technicians to help you run stable production and reduce rejects.

 

First: Confirm Your Product Scope

This machine is designed for standard paint brush production:

Flat brushes: 1" – 5"

Angled brushes: 1" – 4"

Theoretical filament length: 44–155mm

Staying within this range is the foundation of smooth operation. The details below will help you fine-tune for consistent quality.

 

1. Match Ferrule Size and Filament Length Properly

Poor size matching leads to loose bristles and high rework. Based on extensive production tests, we recommend this proven pairing:

 

Ferrule size Bristle length Ferrule height Ferrule gap
1” 44mm ＜32mm Wedges thickness/gap≤0.6
1.5” 44-46mm
2” 48mm
2.5” 51mm
3” 54-56mm
4” ＞57mm

 

(Data in this table is based on goat hair imitation filament: 30% PBT, 70% PET, with a diameter of around 0.08mm. Recommended filament lengths for other materials shall be subject to actual usage conditions.)

Key reminder: Do not use overly short filament on large ferrules.

 

Short filament cannot be securely anchored during the pulling process, causing unstable continuous production. The wasted labor and scrap will far exceed any material savings. Contact our technical team if you need guidance on your material setup.

 

2. Keep Ferrule Height Under 32mm for Quality Taper

 

The filament guard pins at the pulling station are built for ferrules up to 32mm tall. Exceeding this height means the pins cannot properly reach the filament bundle, resulting in failed bristle pulling and uneven taper.

 

Our official recommendation: keep ferrule height at 30mm or less. This margin will greatly reduce tuning time and defects.

 

3. Keep Wedge-to-Ferrule Thickness Ratio (Gap) Below 0.6

 

The “fish-mouth” defect — an open gap in the center of the bristle tip — is caused by excessive wedge thickness.

 

Per our machine specification, the ratio of wedge thickness to ferrule thickness (known as Gap) must stay below 0.6. Exceeding this limit displaces the center filament bundle during forming, creating the gap defect that is very difficult to fix through machine tuning alone.

 

The optimal ratio varies by filament stiffness and ferrule wall thickness. Our on-site technicians will fine-tune it during commissioning, but 0.6 is the strict upper limit for stable production.

 

Final Note

 

Spec sheets set theoretical limits, but real production results depend on how your materials work with the machine. Filament material, stiffness, and ferrule tolerance all affect final quality.

 

 

At Hengyu Automation, we stand behind every machine we deliver. These tips come from our on-site service experience, and we’re always here to support you with troubleshooting, process optimization, and spare parts.

 

If you have questions about tuning or maintenance for our paint brush head machine, feel free to reach out to our after-sales team directly.