Specifications and Configurations of WST-BFP18 Auto Sheet-fed Square Bottom Paper Bag Machine (with Bottom Cardboard)

3.1.Infeed Section

1)Separate sheet paper feeder is adopted for feeding sheet paper automatically.
2)The sheet paper alignment can be adjusted manually in the lateral pattern.

3.2.Top Folding Section

1)Bag mouth creasing first, then top folding.
2)Top folding adopts water glue spray pattern.

3.3.Creasing Section

1)Separate material in-feed and creasing frame is adopted in this section.
2)Two sets of in-feed nip rollers, each one consists of one steel roller and one rubber roller in a roll-to-toll pattern, and can adjust its impressing force by spring.
3)Disk-type creasing device (both of the up and down parts are adjustable) can be adjusted for making various bags with different widths.

3.4.Tube Forming Section

1)The process of making sheet paper into tube is supported by groups of rollers and conveyer belts, whose speed can be adjusted separately.
2)Side glue application adopts hot melt glue spray pattern.
3)The paper tube is transferred for side creasing by vacuum belt conveying system and impressing wheels.
4)Forming mould and groups of djustable multi-discs are used for side tucking; the width of the forming mould is consistent with that of the paper tube.
5)During side creasing the transmission is made by groups of rollers and conveyer belts, whose driving force is provided by main motor.
6)Finally the paper tube after side creasing is transferred through a track with width adjustable in chain-pulling pattern, so that it can be positioned precisely and suitable for bottom forming.

3.5.Turnover Section

1)The transmission is made by groups of rollers and conveyer belts, so the paper tube can turn over(the bottom face forward after turn over)

3.6.Bottom Opening Section

1)The whole machine is mainly controlled by inverter-fed motor.
2)Adjustable bottom creasing device is used to adjust the bag bottom size.
3)Only one creasing line on the bag bottom; no creasing line on the bag surface.
4)Drum grippers, center grippers and sucker work simultaneously for bottom opening; copper guide plate used to drive the bottom to be flat.
5)Multi-layers bottom forming drum, center grippers, second tuck clamps, and drum grippers are adjustable for ease of changeover.
6)Smooth conveyance from guide wheel and belt to bottom cardboard inserting unit.

3.7.Bottom Forming Section

1)The multi-type seamless glue spray is composed of servo motor and synchronous belt, connecting two water-sprayed glue gun systems or hot melt glue spraying system to evenly glue the bottom.
2)The dimension adjustment is controlled by PLC frequency conversion in the on-line electric box and controlled by the touch screen.
3)Guide plate and belt guide for bottom closing and recompaction molding

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