WO2022096974A1 - Appareil et procédé servant à fabriquer des sacs à fond plat, et sac à fond plat - Google Patents

Appareil et procédé servant à fabriquer des sacs à fond plat, et sac à fond plat Download PDF

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Publication number
WO2022096974A1
WO2022096974A1 PCT/IB2021/059651 IB2021059651W WO2022096974A1 WO 2022096974 A1 WO2022096974 A1 WO 2022096974A1 IB 2021059651 W IB2021059651 W IB 2021059651W WO 2022096974 A1 WO2022096974 A1 WO 2022096974A1
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WO
WIPO (PCT)
Prior art keywords
film
patch
unit
bag
cut
Prior art date
Application number
PCT/IB2021/059651
Other languages
English (en)
Inventor
Vedant AGGARWAL
Original Assignee
Aggarwal Vedant
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aggarwal Vedant filed Critical Aggarwal Vedant
Publication of WO2022096974A1 publication Critical patent/WO2022096974A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/006—Controlling; Regulating; Measuring; Safety measures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/005—Making flexible containers, e.g. envelopes or bags involving a particular layout of the machinery or relative arrangement of its subunits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/10—Feeding or positioning webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/146—Cutting, e.g. perforating, punching, slitting or trimming using tools mounted on a drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/85—Applying patches or flexible valve inserts, e.g. applying film-like valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/88—Printing; Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the invention relates to an apparatus for manufacturing block bottom bags from tubular film using thermal welding such that bag is recyclable.
  • Thermoplastic bags are already known which are formed from a tube of thermoplastic material which is cut transversely to the axis of the tube and then joined together along the lines of cutting.
  • the main disadvantage of these known bags is that when filled they assume the shape of a pillow or cushion, a shape which is disadvantageous when it is desired to stack these bags, as well as being wasteful of material since the "pillow comers” will hold only a small volume of material.
  • Lock-bottom 1 or parallelepipedal bags on the other hand known to have, been constructed in the past using one or more plies of paper or like material and using an adhesive to secure the bottom-forming members in place.
  • the bottom forming members are usually formed by suitable cuts and folds in the opposite ends of the blank or tube from which the said bags were constructed, which are not completely recyclable as per current environmental norms/standards.
  • the bases or ends of the block bottom sacks or bags are typically formed in machines where flat placed tubular pieces of thermoplastic film are folded into a block shape at their ends.
  • the bag making machines typically comprise a number of stations designed to carry out specific functions that finally lead to make a complete block bottom bag.
  • a number of new aspects need to be looked at.
  • Such as lesser time for changing roll at the unwinding station to reduce the production loss, quick and even cutting and transfer of cut piece from one direction to another, good bonding of patch to the top and bottom to form a bag and efficient transportation, etc. are some of the main aspects of the machines to be looked at.
  • a typical machine comprises processing stations such as station for opening out the ends of the continuously conveyed tubular sections into the bottom squares forming the open bottoms, and for fixing and closing the bottoms with the insertion of valve leaves or tubes, and for attaching bottom cover sheets onto the closed bottoms.
  • thermoplastic film roll Some of these relate to aspects such as high speed unwinding and edge-guiding of thermoplastic film roll; pre-treatment of thermoplastic film surface like perforation, anchor hole; inspecting the thermoplastic film for flaws; high speed cutting; transferring the thermoplastic film at high speed, rejecting defective parts of the thermoplastic film without interrupting the production flow, and more, which are not considered in a holistic manner.
  • aspects have been considered individually, however, there is not a single apparatus that incorporates all these aspects. Also, synchronous controlling of all these units working as a single machine is a huge challenge.
  • Another patent application CN102328774 (‘774) discloses packaging bag, to a square-bottom valve bag containing thermoplastic plastics and a manufacturing method thereof.
  • the sealing at the end is done by hot air and the cover patch which is applied at the ends to seal the bag can be of plastic or cloth, such kind of bonding of different materials require precision and therefore it is time consuming, which will eventually lower the production rate.
  • Further patent (‘774) does not discloses any apparatus for manufacturing the same or an automated process of manufacturing of such bags.
  • the present invention is distinguished from these prior arts arrangements by a fact that “block-bottom 1 or parallelepipedal bag which is wholly constructed of heat-sealable thermoplastic material with the bottom being formed and joined to the side walls of the bag by thermal welding steps non-contact type. Further, the bags of the present invention may be formed of one or more plies of thermoplastic material. Further, there is therefore also a need to provide a single apparatus to make block bottom bags that incorporates features such as such as inspecting the thermoplastic film for flaws, transferring the thermoplastic film at high speed, rejecting defective parts of the thermoplastic film without interrupting the production flow, and more, by considering them in a holistic, seamless and advantageous manner.
  • the main object of the present invention is to provide an apparatus to make block bottom bags from recyclable thermoplastic film.
  • Another object of the present invention is to provide an unitary apparatus adapted to make recyclable thermoplastic film based block bottom bags that incorporates features such as inspecting the thermoplastic film for flaws, transferring the thermoplastic film at high speed process , rejecting the defective parts of the thermoplastic film without interrupting the production flow, thermal welding of valve patch and cover sheet, and more, by considering them in a holistic manner.
  • a further object of the present invention is to provide a apparatus that is suitably adapted for processing of thermoplastic film to form block bottom bags.
  • Yet another object of invention to provide an automated apparatus for manufacturing of block bottom bag from recyclable thermoplastic.
  • Yet another object of the present invention is to provide an automated process of manufacturing of block bottom bag from recyclable thermoplastic
  • Figure 1 andl A show the apparatus of the present invention in a schematic form
  • Figure 2 shows the welding/sealing device
  • Figure 3 shows the working principle of welding/seahng device
  • Figure 4 shows the block bottom bag made from recyclable thermoplastic film
  • Thermoplastic film can be produced from blown film extrusion machine which involves a process of extrusion of plastic through a circular die, followed by “bubble -like” expansion.
  • Mainly polyethylene (HDPE, LDPE and LLDPE) but a wide variety of other materials can be used as blends with these resins or as single layers in a multi-layer film structure, these include PE, PP, PA and EVOH to form thermoplastic film.
  • Such kind of film and bags made out of it are widely used in Industry packaging (e.g. shrink film, stretch film, bag film or container liners), Consumer packaging (e.g. packaging film for frozen products, shrink film for transport packaging, food wrap film, packaging bags, or form, fill and seal packaging film), Laminating film (e.g. laminating of aluminium or paper used for packaging for example milk or coffee), Barrier film, films for the packaging of medical products, Agricultural film (e.g. greenhouse film, crop forcing film, silage film, silage stretch film).
  • Industry packaging e.g. shrink film, stretch film, bag film or container liners
  • Consumer packaging e.g. packaging film for frozen products, shrink film for transport packaging, food wrap film, packaging bags, or form, fill and seal packaging film
  • Laminating film e.g. laminating of aluminium or paper used for packaging for example milk or coffee
  • Barrier film films for the packaging of medical products
  • Agricultural film e.g. greenhouse film, crop forcing film, silage film, silage stretch film
  • thermoplastic film which are flimsy in nature needs to be treated and handled very precisely during bag manufacturing.
  • the various processes involve needs an accurate and specific functionality so that production rate is high preferably 120- 140 bags per minute or more, and at the same time bag of desired strength is achieved which when filed with 40-50 kg of material can withstand the drop test.
  • the apparatus of the present invention has the following stations or units with their specific functionalities: a) a thermoplastic film-roll feeding means which comprises of a thermoplastic film edge guiding and unwinding unit b) a thermoplastic film preparatory means that in itself comprises
  • thermoplastic film perforation means optionally consist of thermoplastic film perforation means
  • thermoplastic film cleaning means • a thermoplastic film cleaning means c) an inspection and sensing means which comprises of inspection unit d) a thermoplastic film cut length cutting means consisting of high speed cross-cutter e) a transportation means with transfer unit f) a defect rejection means to eliminate defective pieces into rejection zone g) a top and bottom edge opening means comprises of
  • valve patch unit for storing, conveying and thermal welding/sealing means of valve patch i) a top and bottom folding means j) a cover patch unit for storing, conveying and thermal welding means of cover patch k) a stacking means l) a main automation and controlling means
  • some of the aforementioned stations are combined.
  • an apparatus for manufacturing cross bottom sacks from laid-flat tubular cut piece of the film (2) made from thermoplastic film roll (1) is provided.
  • thermoplastic film-roll feeding means (a) which consisting of
  • thermoplastic film edge guiding (not shown)
  • thermoplastic film preparatory means consisting of a preparatory means optionally consist of thermoplastic film perforation unit (5)
  • a preparatory means optionally consists of index hole punching means (44) , and a thermoplastic film cleaning means (not shown) an inspection and sensing means (c) consisting of inspection unit (4) a thermoplastic film cut length cutting means (d) like high speed crosscutter and an inclined cutter unit (7) a transportation means (e) consisting of
  • a traverse transfer unit (8) for transferring film from X to Y direction a defect rejection means (f) which eliminates the defective film cut pieces to ejection zone (40)
  • valve patch application means consisting of a valve patch unit (10) for storing, conveying and thermal welding of valve patch onto the one end of the film
  • a folding means for top and bottom folding (14,15) of film
  • cover patch application means consisting of a cover patch unit (16) for storing, conveying and thermal welding of cover patch
  • stacking means consisting of stacker unit (31) for storing the processed bag made of film
  • main automation and controlling means consisting of controlling unit (41) for controlling the process of manufacture of bag (32) from film
  • the thermoplastic film roll feeding means (a) supplies the thermoplastic film roll (1) which is supported on an unwinder unit (3).
  • the roll is unrolled in form of tubular film.
  • the unwinder unit (3) can be single station or multi station.
  • single and multi-station depicts the number of rolls which can be mounted on the unwinder unit such that an ideal roll is mounted opposite to the active roll.
  • the main aspect of multi station unwinder unit is that presence of plurality of stations side by side having unique shaft (45) for each station such that multiple rolls can be loaded, the said extra rolls can be utilised during change over.
  • the tubular film is made to pass through the thermoplastic film preparatory means (b) which comprises of a perforation unit (5) where at least one set of perforation roller (6) is present.
  • the perforation roller (6) comprises of plurality of needle shaped fins projecting outwards which are termed as nano perforation due to their small size preferably in the range of 0.5-0.7 mm diameter. These needles spread over the roller preferably at a density of 80-90 needles per square centimetre and form a cluster. Due to the cluster of needles and their dense nature, it creates nano perforation holes in the film.
  • nano in nano perforation is well known by person skilled in art such that it signifies the size of the needle such that it is very small when compared to the normal size used for manufacturing of bag from film.
  • the normal size of needle diameter preferably can be in range of 1- 1.5 mm where as nano size of needle diameter preferably can be in the range of 0.5-0.7mm.
  • index holes are made using punching means (44) and cleaning the thermoplastic film is done.
  • the cleaning can be done by jet of air which is passed over the tubular film at low output speed.
  • the tubular film is now passed through an inspection and sensing means (c) which comprises of inspection unit (4) such that any defects in the film can be monitored and the defective area can be removed after cutting by the cutting unit (7) before being processed to the side opening unit (9).
  • the inspection unit (4) further comprises of an emitter (42) and receiver units (43) which capture the image of the thermoplastic film passing through it and any change in the colour of the said thermoplastic film or any crack or breaks is indicated by the emitter / receiver unit and defects are detected.
  • the flaw locations are sensed and stored in a database in the controlling unit (41).
  • an inspection and sensing means (c) is placed before the preparatory means (b). As soon as the defective tubular film is detected by the inspection unit (4) the machine will stop, thereby stops the advancement of the tubular film further into the perforation unit (5). Such activity will increase the life of the perforation unit (5) as only the non- defective film is made to pass through the perforation unit (5).
  • the defects can be of nature like bulge, tear or any kind of protrusion which will hamper the perforation needles.
  • thermoplastic film cut length cutting means which comprises of cutting unit (7) where the film is cut into pieces of predetermined length, which typically depends on the bag size and shape.
  • the cutting of the thermoplastic film is done according to the feedback which is stored in a database.
  • the tubular film which is now cut by the cutter unit (7) into desired length of cut piece (2) with top and bottom end (2A,2B) is obtained.
  • cold cutting method is used to cut the film into desired cut piece (2) which has an advantage over the hot cutting operation. During hot cutting operation the upper and lower layer of the film is sealed together which required additional efforts to be separated in the later stages.
  • High speed cutter unit (7) is incorporated to increase the speed of the cutting operation by 25-30% i.e. 120-140 bags / min.
  • a signal from the inspection unit (4) is sent such that the defective pieces or the area containing defects are cut without wasting the film.
  • the cutting machine is adapted to cut the thermoplastic film at required process speed with high precision. Further, the said adaption of the cutting unit (7) is done due to the cross cutting operation by the cutter. Due to such operation the machine can run continuously without lowering down the speed.
  • the cut pieces (2) are transported to further stations by transportation means (e).
  • the said transportation means comprises of traverse transfer unit (8) which includes a positive grip transfer mechanism that achieves transport at a much higher speed than the system where cut pieces (2) are transported on a single conveyor in a single plane.
  • Such transfer unit (8) is capable of transferring cut piece of thermoplastic film (2) from X direction to Y direction at greater speed without slowing down the machine.
  • the defective piece of thermoplastic film which is sensed by the inspection unit (4) is cut by the cutter and are removed from the mainline processing via defect rejection means (f) into the ejection zone (40) such that only defect-free pieces continue their transport to further downstream stations.
  • the traverse transfer unit (8) can be constructed in such a way that the cut piece (2) does not stop but can be transferred in the inclined pull of fashion.
  • This inclined pull of fashion makes the cut piece (2) to move gradually in the inclined plane and changes the direction from X to Y.
  • edge opening means (g) which comprises of end opening unit (9) where the top and bottom ends (2A,2B) are opened for the purpose of fold making.
  • the opening of the ends may take place using a rotary mechanism or a mechanism that operates in a vertical plane.
  • the sides before subjecting to the rotary mechanism is opened by the suction means or any kind of means such as clipper arrangement which can open the two layers of film.
  • the opened layers of film is subjected to the profiled structures which rotates in such a way that during the movement in Y direction the bag is opened.
  • the end opening station (9) are situated both at the side A as well as side B such that the identical opening of the top and bottom end of the cut piece of film (2) is obtained.
  • a valve patch application means (h) comprises of a valve patch unit (10) which further comprises of valve patch roll (12) which is mounted on a shaft (45) which is free to rotate such that the supply of the valve patch (36) is done continuously and smoothly.
  • Valve patch unit (10) further comprises of a patch welding unit (13) which cuts the valve patch (36) into valve patch cut piece (11) of desired length and paste it over the bottom end of the cut piece of film (2). Further, more details of the patch welding unit is shown in figure 2 which is described in detail in the later stage of the description in the specification.
  • the valve patch (11) can be of a film of same material as of the cut piece of the film (2) or can be manufactured from composite materials which provide enough strength to the valve and can adhere with the substrate firmly.
  • the fixation of the valve patch (11) with the cut piece (2) can be done by any kind of means such as hot welding, hot melt gluing or by using ultrasonic methods.
  • Cut pieces (2) with opened ends are sent to folding means (i) which comprises of top folding unit (14) and bottom folding unit (15) to make folds that form the bottoms of the block-bottom bags.
  • folding means (i) which comprises of top folding unit (14) and bottom folding unit (15) to make folds that form the bottoms of the block-bottom bags.
  • Both top and bottom folding units (14,15) are identical in construction and are placed at side A and side B respectively.
  • cover patch application means which comprises of a cover patch unit (16) which further comprises of cover patch roll (18).
  • cover patch rolls supplies cover patch (37) to the bottom and top end of the folded cut piece of film (2) separately.
  • This individual supply of the cover patch (37) can be facilitated by providing two cover patch roll (18) which is identical in construction and are mounted on a single frame.
  • the cover patch (37) which is supplied from the cover patch roll (18) is made to cut into cover patch cut piece (17) into desired length and are pasted over the top and bottom of the cut piece of the film (2).
  • Such mechanism of cutting and pasting is done by the patch welding unit (13).
  • the apparatus of the present invention comprises of plurality of patch welding unit (13) such that the method of pasting patch can be done individually at different desired stations.
  • the bag (32) now formed is conveyed further by stacker means (k) into the stacker unit (31) at the desired location for stacking.
  • All the processes parameters at each unit level form (a-k) are stored in the main automation and controlling means (m) as a data base and provide feedback to the different unit such that the units can function and can be altered in operation individually.
  • the apparatus of the present invention can produce a thermoplastic block bottom bag using following units only:
  • the optional units such as perforation unit, inspection unit and rejection unit will enhance the speed of the machine such that defective cut pieces of thermoplastic film can be sensed and ejected easily from the main production line.
  • FIG. 2 shows a patch welding unit (13), which is identical in construction for application of both valve patch (11) and cover patch (17) but are placed at different locations as can be seen from figure 1.
  • the patch welding unit (13) comprises of frame (19) on which first idler roller (20), second idler roller (21), third idler roller (23) are mounted such that it provides tension to the patch which is unwounded from the roll (12,18).
  • a pressure roller (23) is also mounted on the frame (19) such that it applies little pressure on the patch (36/37) at first end (33) and hot drum (27), master cuter roller (24) is present at the second end (34) so that cutting of the patch (36/37) can be done properly.
  • the master cutter roller (24) contains a set of blade or sharp knife to cut the patch into piece by rotating about the axis (35).
  • Hot drum (27) preheats the patch cut piece (11/17) so that in the later stages the patch can be pasted over the cut piece of film (2) with good adhesion.
  • a first sensor (25) is provided to sense the edge of the patch (36/37) such that any lateral displacement of the patch (36/37) can be corrected.
  • a second sensor (26) is provided to sense the print mark if any such that the patch is cut at a predetermined length by sensing the print mark.
  • the aforementioned print mark is pre-printed on the patch (36/37) at a predetermined length.
  • This predetermined length is the length of the patch (L) required for covering the top and bottom folded end of the bag (32) as shown in figure 4.
  • the print mark sensor or second sensor (26) is specially designed to recognise the prints and command the master cutter (24) to cut the patch (36/37) at predetermined length.
  • the apparatus of the present invention can produce a thermoplastic film bag (32) without using first sensor (36) as well. In such case a lateral displacement of the patch (36/37) may be observed which can hinder the quality of the bag (32) produced.
  • the apparatus of the present invention can produce a thermoplastic film bag (32) without using second sensor (26) for the bag (32) produced from the non-pnnted thermoplastic film.
  • the non-pnnted film does not comprise of a print mark after every cut length position or printed area.
  • the basic significance of the print mark sensor (26) is that it senses the print mark and cut the film into desired length such that the printing of the film is not hampered.
  • the position of the idler rollers (20,21,22) can be altered in position such that a tension is maintained in the patch (36/37).
  • Valve patch cut piece (11) / cover patch cut piece (17) is sucked by the suction roller (28) such that it is conveyed and laid on the cut piece of the film (2) perfectly without any lateral displacement.
  • suction cylinder (28) comprises of plurality of micro pores (38) through which suction is created.
  • hot gun (30) through nozzle (39) throws a gust of air between the patch (11/17) and cut price of film (2) such that it creates a heating zone.
  • the temperature of the heat zone can be regulated by regulating the amount of air to the thrown by the hot gun (30).
  • the temperature of the heating zone is kept just below the melting temperature of the film or more preferably plastic i.e.
  • a support or impression roller (29) is present which provides a base to the film (2) and provides a positive drive to the film (2).
  • FIG. 4 shows bag (32) with block bottom end made from thermoplastic film cut piece (2) with valve patch cut piece (11) at one end and cover patch cut piece (17) at another end.
  • present invention is distinguished from the prior art arrangements by a “block-bottom 1 or parallel epipedal bag is wholly constructed of heat-sealable thermoplastic material with the bottom being formed and joined to the side walls of the bag with external cover-sheet/sealing sheet using non-contact type thermal welding steps.
  • the bags of the present invention may be formed of one or more plies of thermoplastic material. Further, the film material of bag body and its sealing sheet can be of similar type or different type.
  • the present invention also discloses a method for manufacturing of the block bottom bag from thermoplastic film involves following steps:
  • thermoplastic film roll (1) is made to unwind from the unwinder unit (3).
  • the film is made to enter and is inspected in the inspection unit (4)
  • valve patch cut piece (11) is pasted onto the bottom end (2B).
  • valve patch cut piece (11) is processed by cutting valve patch roll (12) into desired length by the patch welding unit (13).
  • cover patch cut piece (17) is pasted onto the top and bottom end (2A,2b) which are folded.
  • the cover patch cut piece (17) is processed by cutting cover patch roll (18) into desired length by the patch welding unit (13) to form a bag (32) with block bottom ends.
  • the bag (32) is further sent to stacker unit (31) for further storage.
  • the apparatus of the present invention therefore has a number of embodiments.
  • the present invention discloses an apparatus for manufacturing block bottom bags from sections of tubular film.
  • the apparatus comprises the following stations: a thermoplastic film-roll feeding means (a) which consists of an unwinding unit (3) for unwinding the film role and an optionally a thermoplastic film edge guiding; a thermoplastic film preparatory means (b) that in itself consists of a preparatory means with an optional thermoplastic film perforation unit (5) or an optional index hole punching means (44), and a thermoplastic film cleaning means; an inspection and sensing means (c) consisting of an inspection unit (4); a thermoplastic film cut length cutting means (d) in the form of a high speed cross-cutter or an inclined cutter unit (7); a transportation means (e) which consisting of a traverse transfer unit (8) for transferring film from X to Y direction; a defect rejection means (f) to send the defective film cut pieces to ejection zone (40); a top and bottom edge opening means (g) that
  • the unwinder unit (3) is either single station or multi station, wherein in the case of a multi-station unwinder unit there is provided a plurality of stations side by side having unique shaft (45) for each station for facilitating loading of multiple rolls.
  • the film perforation unit (5) is provided with at least one set of perforation roller (6) which comprises of plurality of needle shaped fins projecting outwards spread over the roller at a density of 80-90 needles per square centimetre in a cluster form.
  • the diameter of the needles is in the range of 0.5mm to 0.7mm.
  • said inspection unit (4) comprises an emitter (42) and receiver units (43) capable of capturing the image of the thermoplastic film passing through it and detecting any defects or change in the colour of the said thermoplastic film or any crack or breaks is indicated by the emitter / receiver unit and defects are detected.
  • said cutting means (d) comprises a cutting unit (7) that works on a cold cutting principle.
  • the edge opening means (g) comprises of end opening unit (9) where the top and bottom ends (2A,2B) are opened using a rotary mechanism or a mechanism that operates in a vertical plane, and wherein the sides before subjecting to the rotary mechanism are opened by the suction means or any kind of means such as clipper arrangement which can open the two layers of film, and wherein the opened layers of film are subjected to the profiled structures which rotate such that during the movement in Y direction the bag is opened.
  • valve patch application means (h) comprises a valve patch unit (10) which in itself comprises a valve patch roll (12) which is mounted on a shaft (45) which is free to rotate such that the supply of the valve patch (36) is done continuously and smoothly, and a patch welding unit (13) which cuts the valve patch (36) into valve patch cut piece (11) of desired length and paste it over the bottom end of the cut piece of film (2).
  • the patch welding unit (13) fixes said valve patch (11) with the cut piece (2) using means such as hot welding, hot melt gluing or by using ultrasonic methods.
  • the folding means (i) comprises a top folding unit (14) and a bottom folding unit (15) that make folds to form the bottoms of the block-bottom bags, and wherein said top and bottom folding units (14,15) are identical in construction and are placed at side A and side B respectively.
  • the cover patch application means (j) comprises a cover patch unit (16) which in itself comprises two cover patch rolls (18) that supply cover patches (37) to the bottom and top end of the folded cut piece of film (2) separately.
  • the two cover patch rolls (18) are identical in construction and are mounted on a single frame.
  • cover patches (37) are cut into cover patch cut pieces (17) into desired length and pasted over the top and bottom of the cut piece of the film (2) using a patch welding unit (13).
  • the patch welding unit (13) comprises a frame (19) on which first idler roller (20), a second idler roller (21), third idler roller (23) are mounted to provide tension to the patch which is unwounded from the rolls (12, 18); a pressure roller (23) is also mounted on the frame (19) to apply pressure on the patch (36/37) at first end (33); a hot drum (27), and a master cutter roller (24) is present at the second end (34) to cut the patches (36/37), wherein said master cutter roller (24) contains a set of blade or sharp knife, and wherein said hot drum (27) preheats the patch cut piece (11/17) so that in the later stages the patch can be pasted over the cut piece of film (2) with good adhesion.
  • a first sensor (25) is provided to sense the edge of the patch (36/37) such that any lateral displacement of the patch (36/37) can be corrected, and a second sensor (26) is provided to sense the print mark and said patch is cut at a predetermined length by sensing the print mark.
  • a suction roller (28) is provided to suck the valve patch cut piece (11) or the cover patch cut piece (17) to convey these and lay them on said cut piece (2) wherein said suction cylinder (28) comprises of plurality of micro pores (38) through which suction is created, and a support or impression roller (29) is provided to provide a positive drive to the film (2).
  • a hot gun (30) having a nozzle (39) is provided to throw a gust of air between the patch (11/17) and cut price of film (2) to create a heating zone the temperature of which is regulated by the amount of air to the thrown by the hot gun (30).
  • the temperature of the heating zone is kept just below the melting temperature of the film or more preferably plastic i.e., in the range of 80-100 °C or more preferably 95° such that film (2) and patch (11/17) does not melt but creates a good bonding, following which the block bottom bags are ready to be transported to stacking stations (31).
  • all operations are controlled in synchronous manner using electronic control and automation system, and wherein the main control system has facility for input of required control and process parameters through human machine interface.
  • some of the stations are operated manually.
  • a method of manufacturing of the block bottom bag from thermoplastic film using the apparatus disclosed in the foregoing embodiments has the following characterising steps: a) unwinding a thermoplastic film roll (1) from the unwinder unit (3); b) passing the inspected film through a perforation unit (5) where nano preformation marks are made onto the film by the perforation roller (6); c) inspecting the perforated film in the inspection unit (4) thereby cutting the perforated film into cut piece (2) by cutting unit (7) such that top end (2A) and bottom end (2B) is created which are then opened; d) transferring the cut piece (2) from X direction to Y direction using the transfer unit (8); e) Opening of the film (2) at the end using the end opening unit (9); f) affixing the valve patch cut piece (11) onto the bottom end (2B); h) folding the top and bottom ends (2A, 2B) of the cut piece (2) using, respectively, the top and bottom folding units (14, 15); i) affixing the
  • the invention discloses a block bottom bag made from a tubular film, said bag having a parallelepipedal shaped bottom characterised in that said bag is wholly constructed of heat-sealable thermoplastic material with the bottom being formed and joined to the side walls of the bag by non-contact type thermal welding.

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Abstract

L'invention concerne un appareil et un procédé servant à fabriquer des sacs à fond plat, et un sac à fond plat. L'invention concerne un seul appareil servant à fabriquer des sacs à fond plat incorporant des éléments tels que l'inspection du film thermoplastique à la recherche de défauts, le transfert du film thermoplastique à grande vitesse, le rejet de parties défectueuses du film thermoplastique sans interruption du flux de production, et autres, d'une manière holistique. En conséquence, l'appareil de l'invention comporte un moyen de préparation de film thermoplastique (b), un moyen d'inspection et de détection (c), un moyen de coupe de longueur de coupe de film thermoplastique (d), un moyen de transport (e), un moyen de rejet de défaut (f), un moyen d'ouverture de bord supérieur et inférieur (g), un moyen d'application de feuillet de valve (h), un moyen de pliage d'extrémités supérieure et inférieure (i), un moyen d'application de feuillet de couverture (j), un moyen d'empilement (k), et un moyen d'automatisation et de commande principal (1) consistant en une unité de commande (41) servant à commander le processus de fabrication du sac (32) à partir du film.
PCT/IB2021/059651 2020-11-04 2021-10-20 Appareil et procédé servant à fabriquer des sacs à fond plat, et sac à fond plat WO2022096974A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202011048131 2020-11-04
IN202011048131 2020-11-04

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WO2022096974A1 true WO2022096974A1 (fr) 2022-05-12

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PCT/IB2021/059651 WO2022096974A1 (fr) 2020-11-04 2021-10-20 Appareil et procédé servant à fabriquer des sacs à fond plat, et sac à fond plat

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AR (1) AR123986A1 (fr)
TW (1) TW202227262A (fr)
WO (1) WO2022096974A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170137178A1 (en) * 2015-05-13 2017-05-18 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Paper bag and manufacturing method for a paper bag
CN106739166A (zh) * 2016-12-28 2017-05-31 天津市金利达纸业有限公司 一种包装袋糊底一体机

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170137178A1 (en) * 2015-05-13 2017-05-18 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Paper bag and manufacturing method for a paper bag
CN106739166A (zh) * 2016-12-28 2017-05-31 天津市金利达纸业有限公司 一种包装袋糊底一体机

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TW202227262A (zh) 2022-07-16
AR123986A1 (es) 2023-02-01

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