Booster

The utility model relates to an ejection booster designed to settle the problem of tough ejection due to deformation of the soft packaging tube. A tubular material is taken as an orbit, a perforated cover is provided at either end respectively; an opening is provided on the tube wall, a rolling object is taken as a roller, the clearance designed for the roller and the orbit is twice the thickness of the packaging-tube wall. The soft packaging-tube is arranged into the orbit; an ejection hole is fixed on the cover at one end of the orbit; the roller rolls along the orbit from the tail of the soft packaging-tube to press the soft packaging-tube; the area on the cross-section of the soft packaging tube contacting with the roller is almost zero, therefore, the material contained in the soft packaging-tube can only move toward the ejection hole. When the roller is stopped, the roller does not roll freely due to the elastic deformation of the soft packaging-tube, and the contained material does not return into the rolled soft packaging-tube through the plane roll. The utility model is capable to effectively control undesired deformation.