Core Packaging: Vertical Form Fill Seal ( VFFS ) machines

These machines use a reel of flexible material and either form it into a tube and then seal and fill it at regular intervals or fold it lengthwise and seal it at right angles to the fold to form a series of sachets which are filled and closed.

There are three type operation :

First type of machine ( center seal ), form pouches with a seal at each end and down the center of one face.

Second type of machine ( three or four side seal ), produces sachets with three or four edges sealed.

Third type of machine ( tetrapack operation ), made at rightangles to one another.

There are three kind of Form Fill Seal machinery :

Vertical machines, in which the material is formed into a circular section tube over a forming collar

Horizontal machines, in which the material is formed into a rectangular section tube through a forming box

Sachet forming machines, there are two type :

single web folded in half and then cross sealed

two webs which are brought together and innitially sealed on three side.

These machine frequently used for :

powder product like a milk, corn starch, etc

granular or solid product like a snack, candy, soap bar, etc or

liquid product like a sauce, soya milk, coconut oil,etc

The most important you must know how to select is..

When you use center seal first type of machine ( center seal ), the leakage frequently happen at "T" area, specially for liquid product. For a snack or another food product it cause product's self life shorter than usual because problem leakage happen.

How to solve it :

Using material packaging that sealing point lower than current ( Sealing Initial Temperature /SIT around 130 - 135oC, 60 - 70 strokes/min )
Increase pressure unit ( Jaw Seal ), be carefully whenever causing material shrinkage because over heating and over pressing
To over come over heating using PET ( Polyester film ) or Nylon film for Top layer film, but it not beneficial when using for package a snack, because price of PET and Nylon film higher than price of OPP film that commonly used.

Decrease your machine's speed to increase dwell time sealing for the material, specially at "T" area must be melting at both layer and solidify perfectly to ensure product can't penetrate the film.