A filling device of a dual-layered filling and packing device having a cotton paper device within the packing device which guides cotton paper via a guide rack to fold the paper and to fill a paper bag with fixed amount of tea leaves, by means of a roller, the paper bag with tea leaves being sealed at the edges thereof, and by means of a gripping structure, the tea bag being held to a funnel tube of the folding structure, a plurality of rollers delivered packing foil from an insertion section through space between a folding slot and the funnel tube, characterized in that the gripping structure composes a magnetic cylinder interconnected to a Y-shaped pneumatic cylinder and the gripping section is extended with two corresponding folding board and the folding structure comprises a folding slot covered a gap outside the funnel tube, the cross-section of the funnel tube has a flat body and the folding slot is a U-shaped plate body having a top end folded outward to form the insertion section.

A film is drawn out from a film roll and continuously transferred, and margins of the film are overlapped and is sealed to produce a vertical seal by paired vertical seal rollers to shape the film into a tubular form. A product content is filled into a tube-shaped portion of the film, and the tube-shaped portion of the film is sealed to produce a lateral seal by paired lateral seal rollers and to thereby form a bag. At least one lateral seal roller of the lateral seal rollers is movably provided and there are provided a pusher device for pushing at least one seal roller against the other seal roller, a joint detector provided upstream in a film transfer direction of the paired lateral seal rollers for detecting a joint in the film, and a controller which reduces or eliminates a pushing force exerted by the pusher device when a specified time period has elapsed after detection of the joint in the film by the joint detector.

A forming apparatus is provided for forming a film into a sleeve around a filling tube. The forming apparatus has contact surface geometry that is contacted by the film as it travels thereacross configured to ensure smooth forming of the film into the sleeve. Smooth forming of the film into the sleeve is achieved, in part, by reducing longitudinal tensile forces in the film, by selecting the contact surface geometry to minimize transverse variations in tensile forces in the film, and by having contact edges of the contact surfaces shaped to reduce unnecessary stresses in the film.