Why Do Liquid Capsules Need A Separate Taping Machine?

As we mentioned earlier, a capsule is made up of a capsule cap and a capsule body. When the filling contents contains solvent solutions, it is a liquid capsule. However, the filled liquid will seep out of the junction of the capsule cap and body, which will cause the capsule to be defective. Therefore, a device is required to seal the capsule immediately after it has been filled and locked, before the liquid seeping out.

The liquid capsule banding machine is the device to avoid liquid capsule leakage, which will automatically band the filled capsule. The banding solution is required to seal the capsule, which is an aqueous solution based on gelatin or HPMC. The banding roller will apply the banding solution to the capsule cap and body joint for two loops. After that, the capsule is fed into the dry area, the banding solution solidify in the blowing air until it is not adhesive, now the liquid capsule is sealed and becomes a qualified product.

There are significant differences in design and function between liquid capsule filling machine and powder capsule filling machine, mainly due to the differences in physical properties of filling materials.The following are the specific differences and reasons why a separate taping machine is required for liquid capsules:

I. Core differences

The filling principle is different

Powder filling machine: quantitatively fill the dry powder into the capsule shell by means of screw metering, piston compression or vacuum powder suction.The powder has good fluidity and is easy to divide and measure.

Liquid filling machine: a precision pump (such as a gear pump or a plunger pump) or a peristaltic pump is required to transport viscous liquid, oil or suspension.Liquid is easy to leak, so dynamic sealing technology is needed.

Capsule processing method

Powder machine: the capsule shell is directly filled and then closed (such as the cap body is pressed) without additional sealing.

Liquid machine: An additional sealing step is required after filling, as the liquid may penetrate the capsule shell seams or corrode the gelatin material.

2. Why do liquid capsules need a separate tape sealer?

Necessity of sealing

The liquid is easy to leak or volatilize, and the cap body of the common capsule can not be completely sealed by pressing.The tape sealer enhances sealing by:

Hot melt sealing: the gelatin or auxiliary materials at the seam of the capsule are melted and bonded by heating.

Cause of process separation

Accuracy requirements: liquid filling and sealing shall be carried out step by step.After filling, the capsule needs to be positioned stably to seal accurately, and the independent tape sealing machine can optimize the efficiency.

Material compatibility: The tape may require special materials (such as moisture-proof aluminum foil), separate from the filling station to avoid cross-contamination.

Regulatory Compliance: Pharmaceutical manufacturing requires verification of containment (e.g., microbiological intrusion testing), and separate tape seals facilitate quality control.

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