Automatic Cosmetic Lip Liner Eyebrow Pencil Filling and Demolding Line Designed for Round and Triangular

Product Overview

This lip liner pencil filling machine brings the whole hot filling sequence onto one platform: mould oil spraying, mould preheating, bottom-up filling, timed cooling and automatic demolding. Instead of passing trays between separate stations by hand, the operator loads a mould set, runs a timed preheat, fills from the 5L oil-heated tanks, cools on the integrated table and releases finished pencils with the needle push or air blow method. Sequence control sits in a Mitsubishi PLC, so each stage starts and stops on time rather than on operator judgement.

Contact parts are SS316L inside a SUS304 tank shell, which is the specification most cosmetic quality teams expect from a lip liner pencil filling machine before they will approve a sample batch. Preheating and cooling are the two stages most often skipped by manual workshops and most often blamed later for tip defects. On this line both are timers with visible set points, so a shift supervisor can confirm the cycle ran as intended. A lip liner pencil filling machine that controls those stages produces sticks with an even core, clean surface and predictable hardness, which is exactly what a private label buyer checks in the first 500 pieces.

Key Advantages

• One continuous process: spraying, preheating, filling, cooling and demolding happen in a set sequence, so trays no longer wait between stations.
• SS316L product contact parts: the wetted path inside the SUS304 tank shell is SS316L, which eases cleaning validation before a new shade is introduced.
• Timed preheating: the preheat table runs on a set duration, which reduces the cold-mould defects that cause short shots at the pencil tip.
• Timed cooling before release: pencils solidify on the cooling table at -2°C to -1°C before demolding, which lowers bending and surface marking during release.
• Automatic demolding for both shapes: needle push handles round pencils and the air blow method handles triangular pencils without changing the base machine.
• Atomized oil film: a fine spray keeps mould surfaces conditioned, so release stays clean and manual wiping between cycles is reduced.
• Recipe-driven settings: fill volume, preheat time and cooling time are stored per product, which shortens changeover on a shared lip liner pencil filling machine.

Applications

• Lip liner and lip contour pencil production in 2-10 ml stick volumes.
• Eyebrow pencil lines that need consistent tip fill and clean surface finish.
• Eyeliner pencil production where core density affects application smoothness.
• Under-eye highlight pencils and other soft pencil formats with a low melting point bulk.
• OEM projects that switch between several mould sets during one week of production.

What the Sequence Means in Practice

In a manual workshop the filling, cooling and demolding steps are separated by hand carts and waiting time, and the result varies with the operator. On this lip liner pencil filling machine the stages are linked by timers, so a tray that is preheated for the set period is filled at the same mould temperature as the tray before it, and it cools for the set period before release. That repeatability is what allows a producer to promise a hardness specification to a buyer and then actually hold it across a 20,000 piece order. It also gives the quality team a documented parameter set to attach to each batch record, which is increasingly requested during factory audits for cosmetic pencil supply.

The line is assembled in a workshop that also builds filling, capping and labeling equipment, so the same engineering team that quotes the machine stays involved during commissioning. Documents shared with buyers include the electrical diagram, pneumatic layout, spare part list, operation manual and a video of the factory acceptance run on the buyer’s own bulk samples. That documentation package is what quality managers usually ask for before they approve a new supplier, and it is prepared before shipment rather than after arrival.

Frequently Asked Questions

Q: Does the line demold automatically for triangular pencils?
A: Yes. Round pencils are released with the needle push method and triangular pencils with the air blow method. The correct mode is selected on the control panel and the matching mould set is loaded.

Q: Which materials contact the bulk?
A: The two 5L tanks use a SUS304 outer shell with SS316L parts in contact with the product, and the same SS316L specification is used on wetted filling path components, which helps with cleaning validation between shades.

Q: How long does a full cycle take?
A: Cycle time depends on the bulk formula and on the preheat and cooling durations set for that formula. The line is rated at a stated 45-50 pcs/min, and the timers are adjusted per product and stored as a recipe.

Q: Can one lip liner pencil filling machine handle several mould sets?
A: Yes. Mould sets for different pencil shapes and diameters can be swapped, and each product keeps its own recipe for volume, preheat time and cooling time.

Building a Repeatable Pencil Filling Routine

A lip liner pencil filling machine only delivers consistent output when the surrounding routine is fixed as well. Clean the mould set at the start of each shift, spray a thin atomized film, load the tray on the preheat table and let the timer finish before filling begins. After filling, move the tray to the cooling table without delay, and demold only when the timer releases it. Teams that follow this routine on the lip liner pencil filling machine report fewer tip voids and fewer rejects after sharpening, because the two stages most often rushed by hand are now enforced by the controller.

Because the lip liner pencil filling machine stores volume, preheat and cooling values per product, the routine survives a shift change. A new operator recalls the recipe instead of guessing, which is the main reason buyers move from manual pouring to a lip liner pencil filling machine in the first place.