US20090129708A1 - Plastic zipper having preventing function against unfairly unsealing, and the manufacturing method and manufacturing appartus thereof - Google Patents
Plastic zipper having preventing function against unfairly unsealing, and the manufacturing method and manufacturing appartus thereof Download PDFInfo
- Publication number
- US20090129708A1 US20090129708A1 US12/066,692 US6669208A US2009129708A1 US 20090129708 A1 US20090129708 A1 US 20090129708A1 US 6669208 A US6669208 A US 6669208A US 2009129708 A1 US2009129708 A1 US 2009129708A1
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- US
- United States
- Prior art keywords
- plastic
- zipper
- plastic zipper
- guide rails
- tear tape
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B19/00—Slide fasteners
- A44B19/10—Slide fasteners with a one-piece interlocking member on each stringer tape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
- B65D33/2516—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener
- B65D33/2533—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener the slide fastener being located between the product compartment and the tamper indicating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
- B65D33/2541—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterised by the slide fastener, e.g. adapted to interlock with a sheet between the interlocking members having sections of particular shape
-
- 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
- B31B70/813—Applying closures
- B31B70/8131—Making bags having interengaging closure elements
- B31B70/8133—Applying the closure elements in the cross direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2401/00—Tamper-indicating means
- B65D2401/05—Tearable non-integral strips
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T24/00—Buckles, buttons, clasps, etc.
- Y10T24/25—Zipper or required component thereof
- Y10T24/2514—Zipper or required component thereof with distinct member for sealing surfaces
Definitions
- the present invention relates to prevention against unfairly unsealing of a plastic zipper, of a plastic zipper with a slider, and of a bag equipped with the plastic zipper, which are easily opened and re-closable while they keep hermetic sealing, and which are used as packaging materials of foods, medicines, electronic products, etc.
- Bags equipped with plastic zippers are widely used as packing materials for foods, medicines, electronic products and other goods. Especially, bags equipped with plastic zippers with sliders are widely used as packing materials which are easily opened and re-sealable.
- FIG. 16 a partially sectioned perspective view
- FIG. 17 which is a sectional view taken along arrows B-B′ in FIG. 16 of the above-mentioned Patent document 1
- a partitioning film having perforations is disposed inside the bag.
- a system is applied in this example wherein when a new bag is opened first, the perforations of the partitioning film are opened after the zipper is opened by the slider, and therefore, the bag has good appearance and productivity.
- contents of the bag are fine particles such as powder, there causes a problem that the fine particles are clogged on a portion of the partitioning film and cannot be discharged smoothly.
- FIG. 18 of the above-mentioned Patent document 1 discloses a system applied to a bag body having a zipper with a slider, wherein an upper portion of the zipper is spot welded under a condition wherein the slider is in a closed position, and the spot welded portion of a new bag body is cut off by the slider at the first cut.
- the films at the upper portion of the zipper are closely in contact with each other, it is hard to judge from appearance whether or not the spot welded portion is cut off when the zipper is in a closed state.
- perforations are formed at the upper portion of the zipper, i.e., at the portion above the engaging portion, and while the zipper is in a closed state, a part of the upper portion of the zipper is partially cut off, and then, a slider is disposed at the cut off portion.
- This example applies a system wherein the upper portion of the zipper is cut off from the perforations by means of the slider when it is opened, however, sometimes cutting off may not be done well. Further, this system can be adopted only such a type of zipper as having an (upper) flange portion projecting upward from the engaging portion.
- FIG. 14 and FIG. 16 of the above-mentioned Patent document 1 have advantage that the hermetic seal of the bag can be secured even if the bag uses perforations, but the systems illustrated in FIG. 18 and FIG. 19 cannot be applied to usage requiring a long preservation such as retorted foods because sealing ability of the bag depends on the sealing ability of the zipper.
- Patent document 3 discloses in concrete neither an apparatus nor a method for industrially carrying out such welding.
- Patent document 2 the inventor of the present application disclosed a slider which is applicable to a hermetic plastic zipper wherein engaging portions are welded with each other via an easily peelable plastic layer. Although such a hermetic zipper has a high opening intensity, the slider disclosed in Patent document 2 can open the plastic zipper having high opening intensity such as disclosed in Patent document 2 while the slider is small and strong.
- the inventor of the present application disclosed a method for continuously producing a hermetic zipper, the plastic zipper having easily peelable plastic layer extending in a longitudinal direction of the plastic zipper, wherein the easily peelable plastic layer is welded by ultrasonic waves and which has a peeling intensity in a certain constant level.
- Patent document 1 WO 2005/048763 A1
- Patent document 2 WO 03/022697 A1
- Patent document 3 JP 2004-026193
- Patent document 4 JP 2004-209841
- Patent document 5 JP 2004-196321
- An object of the present invention is to provide a plastic zipper which solves the above-described problems inherent to the conventional plastic zippers, unsealing of which can be known at once from its appearance when the plastic zipper is unfairly or erroneously unsealed so that unfairly unsealing can be prevented, and which can be produced effectively.
- Another objects of the present invention are to provide a manufacturing apparatus and a manufacturing method for manufacturing such a plastic zipper having preventing function against unfairly unsealing.
- the present invention is mainly characterized in that a tear tape having an easily peelable plastic layer is detachably welded on top surfaces of a plastic zipper located at its mouth side, or that top surfaces of the plastic zipper located at its mouth side are detachably welded in a longitudinal direction.
- top surfaces of a plastic zipper located at its mouth side means the portions which comprise two fringes extending in a longitudinal direction of the plastic zipper and located at the mouth side of two plastic films on which a pair of engaging portions are formed, and it is not limited to a plane.
- an apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
- two long and slender guide rails are disposed in parallel to each other so as to guide outer surfaces located at an open end of the plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films;
- multiple sets of guide rollers a set of which consists of two pieces of rollers, are disposed facing to said guide rails so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper, an axis of each guide roller being positioned perpendicular to the guide rails,
- a heating member is disposed facing to a space formed between the two guide rails at a position opposite to the guide rollers relative to the guide rails;
- a moving means for causing approaching and departing movements to said heating member relative to the guide rails is disposed so as to heat up the top surface located at the mouth side of the plastic zipper.
- a tear tape can be welded detachably to the top surfaces of a plastic zipper located at its mouth side by disposing a tear tape supply device for supplying a tear tape into the space formed between the guide rails in the above-described manufacturing apparatus, and thus, the above-described object can be achieved.
- the heating member may be a plate member having an edge parallel to the guide rails, and a fringe of said edge may be straight or uneven.
- a rotatable circular disk having a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member may be used as the heating member.
- the two guide rails may be provided with at least one connecting portion, by which they are connected to each other, at the side of said heating member.
- the heating member has an edge which is formed in a concave shape at a portion facing to the connecting portion in order to avoid collision with connecting portion when the heating member advances toward the guide rails.
- the above-described object is achieved by a method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
- a plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films, to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails so as to guide outer surfaces located at an open end of the plastic zipper into the space located between said guide rails and so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;
- the above-described object is achieved by a method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
- a plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films, and a tear tape having easily peelable plastic layer formed on one surface thereof to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails, said easily peelable plastic layer of said tear tape being supplied in a condition wherein it is capable of in contact with the top surfaces located at the mouth side of the plastic zipper;
- welding may be performed by using a heating member having an edge parallel to the guide rails while the plastic zipper, or the plastic zipper and the tear tape are in a stopped condition.
- the welding may be performed in a moving condition.
- welding may be performed by continuous hot stamping by using rotatable heated circular disk having a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member.
- the above-described object is achieved by a plastic zipper having preventing function against unfairly unsealing characterized in that the plastic zipper has a pair of engaging portions and is located on surfaces of plastic films, and a tear tape is detachably welded to the top surfaces of the plastic zipper at the mouth side thereof along a longitudinal direction of the plastic zipper.
- the above-described object is achieved by a bag body equipped with a plastic zipper having preventing function against unfairly unsealing characterized in that the plastic zipper, which has a tear tape detachably welded on top surfaces thereof located at its mouth side or which has top surfaces located at its mouth side continuously welded thereto, is fitted at a mouth portion of the bag body.
- the plastic zipper the top surfaces of which located at the mouth side is detachably welded in a longitudinal direction, or which has a tear tape having easily peelable plastic layer detachably welded at the top surfaces located at the mouth side thereof, can be produced industrially and effectively.
- the plastic zipper of the present invention has the tear tape having the easily peelable plastic layer detachably welded at the top surfaces located at the mouth side thereof, the tear tape will be peeled off when the plastic zipper is subjected to unfair or erroneous unsealing. Under such a condition, even if a person who has performed unfair action tries to return it to its former condition, the former condition cannot be returned any more. Further, the fact wherein the unsealing operation has be done can be understood at a glance from its appearance. Especially when the tear tape is used, even if a part of the tear tape has been peeled off, the fact wherein the unsealing operation has been done can be understood at a glance, since the peeled off portion flutters.
- the tear tape will be cut off, when the tear tape is subjected to a peeling off operation from the side edge, and accordingly, it can be understood that it has been subjected to an unfair unsealing operation.
- the tear tape will be cut off or peeled off when the slider is moved with the tear tape adhered thereto, and accordingly, it can be understood that it has been subjected to an unfair or erroneous unsealing operation.
- the plastic zipper which is an object of the present invention, may have engaging portions formed in any shape as long as it has a pair of engaging portions 1 A and 1 B formed on surfaces of two plastic films F and F, and it may have or may not have flange portion extending outward from the engaging portion.
- top surface located at the mouth side of the plastic zipper means the portion located at the edge of the mouth side, and the engaging portion may be the edge, and alternatively, the flange portion may be the edge, and further, the edge may be in a flat surface or in a curved surface, and its shape is not limited particularly.
- the engaging portions of the plastic zipper 1 in the embodiment illustrated in FIGS. 1 and 2 comprise a pair of male and female hooks 1 A and 1 B and do not have any flange portions, and the edges TA and TB (please refer to FIG. 2 .) of the engaging portion located at mouth side are the top surfaces located at the mouth side of the plastic zipper.
- a pair of long and slender guide rails 3 A and 3 B are disposed in parallel to each other and forming a space therebetween. These guide rails 3 A and 3 B are used to guide two outer surfaces 1 C and 1 C of the edges located at the mouth side of the plastic zipper 1 , and the edges located at the mouth side are inserted into the space between the guide rails 3 A and 3 B. Further, in this embodiment, a tear tape 5 is also inserted into the space between the guide rails TA and TB.
- the tear tape 5 has easily peelable plastic layer 5 E on one surface thereof, and this easily peelable plastic layer 5 E is so inserted that it becomes in contact with the top surfaces TA and TB located at mouth side of the plastic zipper 1 .
- multiple sets of guide rollers 2 A and 2 B are disposed facing to guide rails 3 A and 3 B and spacing in a longitudinal direction of the guide rails 3 A and 3 B.
- the guide rollers 2 A and 2 B are used to sandwich the plastic films F and F near the engaging portion of the plastic zipper 1 located at the side of the contents.
- the axes 8 A and 8 B of the guide rollers 2 A and 2 B are positioned perpendicular to the guide rails 3 A and 3 B. It is preferred that each guide roller 2 A or 2 B is supported on the rotating axis 8 A or 8 B via bearing, respectively.
- a heating member 4 is disposed facing to a space formed between the two guide rails 3 A and 3 B at a position opposite to the guide rollers 2 A and 2 B relative to the guide rails 3 A and 3 B.
- the heating member 4 is connected to a moving means 6 , for example, an actuator, which can cause the heating member 4 its approaching and departing movements relative to the guide rails 3 A and 3 B.
- the heating member 4 is used for heating the top surfaces TA and TB at the mouth side of the plastic zipper 1 which is sandwiched by the guide rails 3 A and 3 B, and it is advanced by means of the moving means 6 towards the space formed between the guide rails 3 A and 3 B to a position which is indicated by an alternate long and two short dashes line in FIGS. 1 and 2 , and it heats up the tear tape 5 and the top surfaces TA and TB at the mouth side of the plastic zipper 1 , in the embodiment illustrated in FIGS. 1 and 2 .
- the heating member 4 is a plate member having an edge 4 A parallel to the guide rails 3 A and 3 B, and the fringe 4 B of the edge 4 A is straight.
- the fringe 4 A of the heating member 4 is straight, it can form a continuous welded portion.
- the fringe 4 B of the edge 4 A of the heating member 4 may be uneven, and in this case, it can form welded portions along a dotted line.
- the welding operation of the tear tape 5 to the top surfaces at the mouth side of the plastic zipper 1 is done as follows.
- the plastic zipper 1 and the tear tape 5 are forwarded between the guide rails 3 A and 3 B and between the guide rollers 2 A and 2 B from a plastic zipper supply device and the tear tape supply device, which are not illustrated in the drawings. In this case, they are forwarded in such a condition that the easily peelable plastic layer 5 E on the tear tape 5 is able to be in contact with the top surfaces TA and TB at the mouth side of the plastic zipper 1 , and the outer surfaces 1 C and 1 C of the mouth side ends of the plastic zipper 1 are guided into the space between the guide rails 3 A and 3 B, and simultaneously, the tear tape 5 is also guided into the space.
- the plastic films F and F located near the engaging portions 1 A and 1 B of the plastic zipper 1 are sandwiched by each set of the guide rollers 2 A and 2 B. Then, under this condition, the movements of the plastic zipper 1 and the tear tape 5 are stopped. Under this stopped condition, the top surfaces TA and TB at the mouth side of the plastic zipper 1 sandwiched by the guide rails 3 A and 3 B and the easily peelable plastic layer 5 E of the tear tape 5 are in a condition wherein they keep their contact.
- the phrase “in a condition wherein they keep their contact” means that they are in a condition wherein the tear tape 5 and the top surfaces TA and TB at the mouth side of the plastic zipper 1 are in parallel to each other and become close so that they are in contact with each other or slightly away from each other.
- the actuator 6 is operated, and the plate shaped heating member 42 which has been positioned at the waiting position is advanced to a position illustrated in an alternate long and two short dashes line, and is inserted into the space between the guide rails 3 A and 3 B.
- the plate shaped heating member 4 is pressed to the stopped top surfaces TA and TB at the mouth side of the plastic zipper 1 and the tear tape 5 to hot stamp them.
- the easily peelable plastic layer 5 E of the tear tape 5 is melt by the hot stamping, and the tear tape 5 is detachably welded to the top surfaces TA and TB at the mouth side of the plastic zipper 1 .
- the welded pattern is determined by the shape of the fringe 4 B of the edge 4 A of the plate shaped heating member 4 .
- the plastic zipper 1 and the tear tape 5 are transferred in a direction of an arrow indicated by OUT in FIG. 1 , and in the space between the guide rails 3 A and 3 B, the plastic zipper 1 and the tear tape 5 , both of which have not been welded yet, are transferred from a direction indicated by arrow IN to a direction indicated by an arrow OUT.
- plastic zippers 1 which have tear tapes 5 welded to the top surfaces TA and TB at mouth side thereof, can be produced continuously.
- the plastic zipper 1 which comprises a pair of male and female hooks 1 A and 1 B, of the present invention, which has preventing function against unfairly unsealing and which has tear tape 5 welded to the top surfaces TA and TB at mouth side thereof, is produced.
- FIG. 3 illustrates another embodiment of the plastic zipper which can be produced by the apparatus illustrated in FIGS. 1 and 2 .
- no tear tape 5 is used, but the welded portion TS which continuously extends in a longitudinal direction of the zipper is formed by welding the top surfaces TA and TB at mouth side of the zipper 1 with other.
- Such a welded portion TS is formed as follows.
- a plastic film F with a long sized plastic zipper having a pair of engaging portions 1 A and 1 B is supplied between the guide rail 3 A and 3 B and between the guide rollers 2 A and 2 B.
- the outer surface 1 C of the top surfaces at the mouth side of the plastic zipper is guided to the space between the guide rails 3 A and 3 B, and the plastic film F located near the engaging portions 1 A and 1 B at the contents side of the plastic zipper is sandwiched by each set of the guide rollers 2 A and 2 B. Then, in the sandwiched condition, the movement of the plastic film F is stopped.
- the heating member 4 having a straight fringe 4 B at the edge 4 A is inserted into the space between the guide rail 3 A and 3 B, and the top surfaces TA and TB at mouth side of the stopped plastic zipper are hot stamped by the straight fringe 4 B, and thus, a welded portion TS which continuously extends in a longitudinal direction of the zipper is formed.
- the plastic film F is transferred in a direction indicated by OUT, and a slider is fitted therewith.
- heat sealing HS is done perpendicular to a longitudinal direction of the plastic film F, and the open mouth for filling is sealed off after the contents have been filled up, and cutting off operation is carried out at the heat sealed portion HS.
- FIG. 4 which is a perspective view similar to FIG. 1 , shows another embodiment of an apparatus for manufacturing a plastic zipper of the present invention, which has a preventing function against unfairly unsealing
- FIG. 5 is a cross sectional view taken along lines B-B′ in FIG. 4 .
- the welding operation was performed in a condition wherein the plastic zipper 1 and the tear tape 5 were stopped.
- the embodiment illustrated in FIGS. 4 and 5 is an apparatus for welding a moving tear tape to a the plastic zipper.
- the guide rollers 2 A and 2 B and the guide rails 3 A and 3 B are the same as those disposed in the apparatus illustrated in FIGS. 1 and 2 .
- the heating member 4 is a rotatable circular disk.
- the heating circular disk 4 is rotatably supported around the rotating axis 7 , and it is connected to a moving means 6 , for example, an actuator, which causes approaching and departing movements relative to the guide rail 3 A and 3 B.
- the rotating axis 7 is disposed perpendicular to a longitudinal direction of the guide rails and a transferring direction of the heating disk 4 .
- the plastic zipper 1 which has a pair of engaging portions 1 A and 1 B, and the tear tape 5 , which has the easily peelable plastic layer 5 E on one side, are supplied from the plastic zipper supplying device and from the tear tape supplying device, both of which are not illustrated, between the long and slender guide rails 3 A and 3 B which are positioned in parallel to each other forming a space therebetween and between multiple sets of guide rollers 2 A and 2 B, each of which consists of two pieces.
- the easily peelable plastic layer 5 E of the tear tape 5 is made in a condition wherein it is in contact with the top surfaces TA and TB at the mouth side of the plastic zipper 1 , the outer surfaces 1 C and 1 C of the top surfaces at the mouth side of the plastic zipper are guided to the space between the guide rails 3 A and 3 B, and the tear tape 5 is also guided into the space.
- the plastic films F and F which are near the engaged portions 1 A and 1 B of the plastic zipper 1 located at the contents side are sandwiched by each set of guide rollers 2 A and 2 B.
- the rotatable heating circular disk 4 is advanced to a position illustrated in an alternate long and two short dashes line, and it is inserted into the space between the guide rails 3 A and 3 B.
- the heating circular disk 4 at the advanced position presses the tear tape 5 against the top surfaces TA and TB at the mouth side of the plastic zipper 1 , and it performs hot stamping operation together with the movements of the plastic zipper 1 and the tear tape 5 while it is rotating in a transferring direction.
- the top surfaces TA and TB at mouth side of the plastic zipper 1 and the easily peelable plastic layer 5 E of the tear tape 5 are detachably welded with each other.
- the heating circular disk 4 can move between the advanced position illustrated in an alternate long and two short dashes line and a waiting position illustrated in a continuous line, by continuously moving the plastic zipper 1 and the tear tape 5 while the heating circular disk 4 is stopped at the advanced position, the welding can be done continuously. Further, while the plastic zipper 1 and the tear tape 5 are moving continuously, the welding can be done intermittently by reciprocating the heating circular disk 4 between the advanced position and the waiting position.
- the inventor of the present application has conducted an investigation wherein the guide rails similar to the guide rails 3 A and 3 B are used in place of the disposition of the sets of guide rollers 2 A and 2 B.
- the base portion at the engaging portion in the zipper strongly gnaws into the guide rails when the heating member 4 is pressed to the top surfaces TA and TB at the mouth side of the plastic zipper, and accordingly, when the plastic zipper moves in a lengthwise direction, the frictional resistance in a moving direction is generated, and the frictional resistance fluctuates widely with lapse of time, i.e., frictional resistance highly increases or decreases with lapse of time.
- the zipper tape may be prolonged, or it may be deformed by heat caused by the frictional resistance or by prolongation. Therefore, it is not so practical to use guide rails for sandwiching plastic films at the contents side.
- the frictional resistance taking into consideration the thickness of edge portion at mouth side of the plastic zipper, the frictional resistance can be decreased by adjusting the space between the guide rails 3 A and 3 B, which guide two outer surfaces 1 C and 1 C of the top surfaces at the mouth side of the plastic zipper 1 , at an appropriate value.
- the inventor of the present invention has conducted an investigation, wherein guide rollers similar to the guide rollers 2 A and 2 B are used instead of disposition of the guide rails 3 A and 3 B.
- guide rollers similar to the guide rollers 2 A and 2 B are used instead of disposition of the guide rails 3 A and 3 B.
- the velocity of the tear tape changes abruptly upon start or stop of supply of the tear tape, and if the tape undulates, there causes problems that the tear tape is caught in the space between the guide rollers or that it entangles around the guide roller.
- the guide rails 3 A and 3 B are used like the present invention, such problems do not occur.
- FIG. 6 Another embodiment of guide rails 3 A and 3 B and the plastic zipper is illustrated in FIG. 6 .
- FIGS. 6( a ) and 6 ( b ) are views corresponding to the cross sectional view taken along A-A′ in FIG. 1 , respectively, they show different embodiments, respectively.
- each guide rail 3 A or 3 B is formed in a long and slender parallelepiped shape as a whole, it is provided with grooves 3 C and 3 C extending in a longitudinal direction at their surfaces facing each other. The upper and lower edges of the tear tape 5 enters in these grooves 3 C and 3 C and is guided thereby.
- the plastic zipper 1 of this embodiment is of a type wherein the flange portions FLA and FLB projecting from the engaging portions 1 A and 1 B. The thickness of both flange portions FLA and FLB is smaller than the thickness of the engaging portions 1 A and 1 B.
- the space between the guide rails 3 A and 3 B at the portion where the flange portions FLA and FLB are guided is narrower than that in the embodiment illustrated in FIGS. 1 and 2 , however, the space between the guide rails 3 A and 3 B located at the side where the heating member 4 is inserted is wider so that inserting operation can be done easily.
- the guide rollers 2 A and 2 B and the heating member 4 are similar to those of the above-explained embodiments illustrated in FIGS. 1 and 2 and in FIGS. 4 and 5 , and also the welding method can be carried out along the lines explained with regard to these embodiments.
- FIGS. 7( a ) and 7 ( b ) are perspective views of a plastic zipper according to another embodiment of the present invention, and FIG. 7( a ) shows the situation wherein the tear tape is welded, and FIG. 7( b ) shows the situation wherein a part of the tear tape is peeled off.
- the plastic zipper 1 of this embodiment has the flange portions FLA and FLB extending outward from the engaging portions 1 A and 1 B, and the tear tape 5 is welded to the top surfaces TA and TB at mouth side along a broken line.
- the tear tape 5 can be easily peeled off even if the peel off intensity is strong.
- the phrase “weld along a broken line” means that the shape of the welded portion TS is formed by short straight lines which continue intermittently, it is a dotted line comprising a plurality of dots and formed in a round shape, a square shape or a designed pattern, or it is a mixture of short straight lines and dot lines, and it is not limited to the case wherein a tear tape is used, but it also includes the case wherein the top surfaces at mouth side of the zipper are directly welded, too.
- the tear tape 5 is cut obliquely, namely forming an angle of less than 90°, from the side edge toward the closed end of the plastic zipper.
- the tear tape 5 can be peeled off continuously without cutting off on its way, when the tear tape 5 is pulled and peeled off from the opening end of zipper towards its closing end.
- the position of the slits 5 A in the tear tape 5 i.e., the space between the slits, and the number of the slits 5 A are not particularly limited, as long as they are in ranges wherein unfair peeling off can be understood, and they may be formed uniformly in a lengthwise direction, and alternatively, they may be formed at a part of the lengthwise direction. Preferably, they are formed on both the sides of the tear tape as illustrated.
- the width n (in mm) of the tear tape 5 is within a following range of inequality wherein the thickness of the top surfaces at the mouth side stands for m (in mm). 0.5 ⁇ n ⁇ m+4 (in mm)
- the connecting portion 3 D can restrict such movement of the tear tape 5 and can prevent its coming out from the grooves 3 C. Therefore, the producing speed, i.e., moving velocities of the plastic zipper 1 and the tear tape 5 , can be enhanced.
- any one of the following methods may be accepted.
- the zippers are closed, and then, the top surfaces TA and TB at the mouth side are welded directly or using the tear tape by mean of the methods of the present invention.
- the bag bodies having the preventing function against unfairly unsealing are obtained.
- the top surfaces TA and TB at the mouth side are welded directly or using the tear tape so that the bag bodies having the preventing function against unfairly unsealing are obtained, and then, contents are filled in the bag bodies through the mouth which has been open at the bottom or the side in accordance with the known method, thereafter, the filling open mouth is closed by the heat sealing.
- the bag bodies having the preventing function against unfairly unsealing are obtained.
- bag bodies filled with contents which have been packed automatically can be produced.
- the films having hermetic zipper fitted therewith are introduced into a zipper guide Y 10 which comprises two parallel guide rails 3 A and 3 B and multiple sets of guide rollers 2 A and 2 B in an apparatus of the present invention illustrated in FIGS. 1 and 2 .
- a tear tape having easily peelable plastic layer formed thereon is withdrawn from a tear tape roll Y 7 and is introduced into the zipper guide Y 10 through a dancer roll Y 8 while the tension therein is kept constant.
- the depth of the hot stamping can be set arbitrarily by adjusting the stroke of the moving means 6 , i.e., actuator, of the welding device Y 11 , and is preferably in a range between 0.1 mm and 0.5 mm.
- the stroke of the moving means 6 i.e., actuator
- the welding device Y 11 the depth of the hot stamping can be set arbitrarily by adjusting the stroke of the moving means 6 , i.e., actuator, of the welding device Y 11 , and is preferably in a range between 0.1 mm and 0.5 mm.
- the films with the plastic zipper which have been fitted with the unfair unsealing preventing portions added thereto are subjected to unsealing preventing operation, such as forming slits at a predetermined positions at the closed end of the zipper, by means of a closed end manufacturing device Y 12 , and the slider is installed at the positions, where the unsealing preventing operation has been done, by means of an automatic slider installing device Y 13 .
- the slider is supplied from the automatic slider supplying device Y 14 .
- Patent Laid-open No. 2004-209841 Japanese Patent Laid-open No. 2004-209841
- Patent Document 5 Japanese Patent Laid-open No. 2004-196321
- a tape-like plastic zipper wherein a hook of an engaging portion has not been welded is withdrawn from a zipper roll Y 30 , and the portion corresponding to easily peelable plastic layer on the hook of the plastic zipper is inserted between an ultrasonic horn H- 1 and an anvil A- 1 which are spaced at a constant distance, and then, the plastic zipper is passed through between the ultrasonic horn H- 1 and the anvil A- 1 at a constant velocity, and the easily peelable plastic layer on the hook is welded continuously by means of the ultrasonic wave.
- the plastic zipper having the hook welded thereto is fed into a zipper guide Y 10 of the present invention, and while the tear tape is also supplied with from a tear tape roll Y 7 , hot stamping is done continuously by means of the welding device Y 11 which comprises the rotatable heating plate 4 and the moving means 6 as illustrated in FIGS. 4 and 5 .
- the welding device Y 11 which comprises the rotatable heating plate 4 and the moving means 6 as illustrated in FIGS. 4 and 5 .
- a hermetic zipper which has a portion for preventing unfairly unsealing can be continuously manufactured.
- it is wound up into a zipper roll Y 33 .
- Dry laminated films were wound into film rolls Y 1 and Y 2 , respectively, which films comprised linear low density polyethylene (L-LDPE) having a thickness of 40 micron at inside thereof and PET having a thickness of 20 micron at outside thereof. These films, used for constituting the bag body, were withdrawn from the film rolls Y 1 and Y 2 , and were supplied with the bag manufacturing machine through the dancer roll Y 4 .
- L-LDPE linear low density polyethylene
- This hermetic zipper was withdrawn from the zipper roll Y 3 , and was set on a predetermined position on the films used for bag bodies which were fed from the film rolls Y 1 and Y 2 , and then, the zipper was welded intermittently to the films by means of the heat sealing machine Y 5 and Y 6 . In this manner, the films with the hermetic zipper were formed.
- the guide rails had a length of 400 mm and had two long and slender parallelepiped shapes which were spaced and positioned in parallel to each other, and had grooves, the depth q of which was 1 mm and width p of which was 1 mm, formed therein as illustrated in FIG.
- the tear tape the width of which was 3 mm and the material of which was lamination of the polyethylene terephthalate (PET) resin having a thickness of 15 micron and the easily peelable resin having a thickness of 30 micron, was withdrawn from the tear tape roll Y 7 , and while the tension was kept at 60 gf, it was introduced into the groove of the guide rails of the zipper guide 10 through the dancer roll Y 8 .
- PET polyethylene terephthalate
- the hot stamping portion i.e., the shape of the edge, of the heating member in the welding device Y 11 was constituted by the rectangles, which have a size of 0.8 mm ⁇ 0.3 mm and which were aligned in a dotted line at an interval of 5 mm in a longitudinal direction, and the stamped shape was in a broken line.
- the films fitted with the plastic zipper having the unfair unsealing preventing portion were further transferred, and were added the preventing operation against unsealing, such as the cutting, at a predetermined position of the closed end of the zipper, and then, the slider was installed at the position, where the preventive operation against unsealing was performed, by means of the automatic slider setting device Y 13 .
- the slider was supplied from the automatic slider supplying device Y 14 .
- Such bag bodies could be produced at a speed of 50 bags per a minute.
- the peeling intensity at 90 degree peeling off was 224 gf in the average and 41.9 gf in the standard deviation, respectively.
- FIG. 1 A first figure.
- FIG. 1 It is a perspective view showing one embodiment of an apparatus for manufacturing a plastic zipper of the present invention with preventing function against unfairly unsealing together with a long plastic zipper and a long tear tape processed in this apparatus, and the long plastic zipper and the long tear tape are cross sectioned.
- FIG. 1 It is a cross sectional view taken along A-A′ in FIG. 1 , wherein the hatching lines showing the cross section are partly omitted.
- FIG. 1 It is a perspective view of one embodiment showing a bag body of the present invention which is equipped with a plastic zipper with preventing function against unfairly unsealing, and a part of which is illustrated in cross section.
- FIG. 1 It is a view showing another embodiment of an apparatus for manufacturing a plastic zipper of the present invention with preventing function against unfairly unsealing, and it is a perspective view similar to FIG. 1 .
- FIGS. 6( a ) and 6 ( b ) are cross sectional views correspond to the cross section views taken along A-A′ in FIG. 1 , wherein the hatching lines showing the cross section are partly omitted, they show other embodiments, respectively.
- FIGS. 7( a ) and 7 ( b ) are cross sectional views showing other embodiments of the plastic zipper of the present invention, and FIG. 7( a ) shows the state wherein the tear tape is welded, and FIG. 7( b ) shows the state wherein a part of the tear tape is peeled off.
Abstract
In a plastic zipper 1 having a pair of engaging portions 1A and 1B formed on surfaces of plastic films F, a plastic zipper having preventing function against unfairly unsealing is provided wherein a tear tape 5 is detachably welded to the top surfaces at mouth side of the plastic zipper in a longitudinal direction of the plastic zipper, and thus, it can be ascertained at a glance that it is unsealed unfairly or erroneously.
The plastic zipper is guided between two guide rails 3A and 3B, disposed in parallel to each other and forming a space therebetween, and pairs of guide rollers 2A and 2B, and a tear-tape having easily peelable plastic layer formed on one surface thereof is guided to the space between the guide rails 3A and 3B, and then, both of them are welded together by hot stamping by means of a heating member.
Description
- The present invention relates to prevention against unfairly unsealing of a plastic zipper, of a plastic zipper with a slider, and of a bag equipped with the plastic zipper, which are easily opened and re-closable while they keep hermetic sealing, and which are used as packaging materials of foods, medicines, electronic products, etc.
- Bags equipped with plastic zippers are widely used as packing materials for foods, medicines, electronic products and other goods. Especially, bags equipped with plastic zippers with sliders are widely used as packing materials which are easily opened and re-sealable.
- However, with diversification of contents of packages, further more advanced air tightness has been required for a package, and an additional function of a package wherein broken seal can be detected after it has been hermatically sealed is desired because the sealed package which has been opened by wrong purpose or by an inaccurate error may cause various troubles such as mixing of foreign substances or spoiling of quality of contents in the package.
- The inventor of the present application disclosed conventionally known examples of plastic zippers with the sliders having preventing function against unfairly unsealing in
FIGS. 14 to 19 of WO 2005/048763 A1 (Patent document 1). - In the example illustrated in
FIG. 14 (a partially sectioned perspective view) and inFIG. 15 which is a sectional view taken along arrows A-A′ inFIG. 14 of the above-mentionedPatent document 1, in a bag body having a zipper with a slider, the zipper and the slider fitted at the upper portion of the bag body are covered by a perforated covering film. Since a system is applied in this example wherein when a new bag is opened first, the zipper is opened or closed by the slider after the covering film is torn along the perforations, the system is simple and has a good operability. However, there is a disadvantage that the bag has bad appearance and inferior industrial productivity. - In the example illustrated in
FIG. 16 (a partially sectioned perspective view) and inFIG. 17 which is a sectional view taken along arrows B-B′ inFIG. 16 of the above-mentionedPatent document 1, in a bag body having a zipper with a slider, a partitioning film having perforations is disposed inside the bag. A system is applied in this example wherein when a new bag is opened first, the perforations of the partitioning film are opened after the zipper is opened by the slider, and therefore, the bag has good appearance and productivity. However, when contents of the bag are fine particles such as powder, there causes a problem that the fine particles are clogged on a portion of the partitioning film and cannot be discharged smoothly. -
FIG. 18 of the above-mentionedPatent document 1 discloses a system applied to a bag body having a zipper with a slider, wherein an upper portion of the zipper is spot welded under a condition wherein the slider is in a closed position, and the spot welded portion of a new bag body is cut off by the slider at the first cut. However, in this example, since the films at the upper portion of the zipper are closely in contact with each other, it is hard to judge from appearance whether or not the spot welded portion is cut off when the zipper is in a closed state. - In the example illustrated in
FIG. 19 of the above-mentionedPatent document 1, perforations are formed at the upper portion of the zipper, i.e., at the portion above the engaging portion, and while the zipper is in a closed state, a part of the upper portion of the zipper is partially cut off, and then, a slider is disposed at the cut off portion. This example applies a system wherein the upper portion of the zipper is cut off from the perforations by means of the slider when it is opened, however, sometimes cutting off may not be done well. Further, this system can be adopted only such a type of zipper as having an (upper) flange portion projecting upward from the engaging portion. - The systems illustrated in
FIG. 14 andFIG. 16 of the above-mentionedPatent document 1 have advantage that the hermetic seal of the bag can be secured even if the bag uses perforations, but the systems illustrated inFIG. 18 andFIG. 19 cannot be applied to usage requiring a long preservation such as retorted foods because sealing ability of the bag depends on the sealing ability of the zipper. - Further, the inventor of the present application proposed in Japanese Patent Application Laid-open No. 2004-026193 (Patent document 3) that in order to prevent unfairly unsealing of a zipper, at a mouth side end of one of a plastic zipper having a pair of male and female hooks, a covering piece covering up a mouth side end of the other hook is disposed and that the covering piece and the mouth side are welded together. However, the Patent document 3 discloses in concrete neither an apparatus nor a method for industrially carrying out such welding.
- Further, in WO 03/022697 A1 (Patent document 2), the inventor of the present application disclosed a slider which is applicable to a hermetic plastic zipper wherein engaging portions are welded with each other via an easily peelable plastic layer. Although such a hermetic zipper has a high opening intensity, the slider disclosed in Patent document 2 can open the plastic zipper having high opening intensity such as disclosed in Patent document 2 while the slider is small and strong.
- Furthermore, in the
Patent document 1, the inventor of the present application disclosed a method for continuously producing a hermetic zipper, the plastic zipper having easily peelable plastic layer extending in a longitudinal direction of the plastic zipper, wherein the easily peelable plastic layer is welded by ultrasonic waves and which has a peeling intensity in a certain constant level. - Patent document 1: WO 2005/048763 A1
- Patent document 2: WO 03/022697 A1
- Patent document 3: JP 2004-026193
- Patent document 4: JP 2004-209841
- Patent document 5: JP 2004-196321
- An object of the present invention is to provide a plastic zipper which solves the above-described problems inherent to the conventional plastic zippers, unsealing of which can be known at once from its appearance when the plastic zipper is unfairly or erroneously unsealed so that unfairly unsealing can be prevented, and which can be produced effectively.
- Other objects of the present invention are to provide a manufacturing apparatus and a manufacturing method for manufacturing such a plastic zipper having preventing function against unfairly unsealing.
- The present invention is mainly characterized in that a tear tape having an easily peelable plastic layer is detachably welded on top surfaces of a plastic zipper located at its mouth side, or that top surfaces of the plastic zipper located at its mouth side are detachably welded in a longitudinal direction. In the present invention, the phrase “top surfaces of a plastic zipper located at its mouth side” means the portions which comprise two fringes extending in a longitudinal direction of the plastic zipper and located at the mouth side of two plastic films on which a pair of engaging portions are formed, and it is not limited to a plane.
- According to the present invention, the above-described object is achieved by an apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
- two long and slender guide rails are disposed in parallel to each other so as to guide outer surfaces located at an open end of the plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films;
- multiple sets of guide rollers, a set of which consists of two pieces of rollers, are disposed facing to said guide rails so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper, an axis of each guide roller being positioned perpendicular to the guide rails,
- a heating member is disposed facing to a space formed between the two guide rails at a position opposite to the guide rollers relative to the guide rails; and
- a moving means for causing approaching and departing movements to said heating member relative to the guide rails is disposed so as to heat up the top surface located at the mouth side of the plastic zipper.
- Further, a tear tape can be welded detachably to the top surfaces of a plastic zipper located at its mouth side by disposing a tear tape supply device for supplying a tear tape into the space formed between the guide rails in the above-described manufacturing apparatus, and thus, the above-described object can be achieved.
- In the manufacturing apparatus, the heating member may be a plate member having an edge parallel to the guide rails, and a fringe of said edge may be straight or uneven. Alternatively, a rotatable circular disk having a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member may be used as the heating member.
- Further, in the manufacturing apparatus, the two guide rails may be provided with at least one connecting portion, by which they are connected to each other, at the side of said heating member. In this case, the heating member has an edge which is formed in a concave shape at a portion facing to the connecting portion in order to avoid collision with connecting portion when the heating member advances toward the guide rails.
- According to the present invention, the above-described object is achieved by a method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
- supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails so as to guide outer surfaces located at an open end of the plastic zipper into the space located between said guide rails and so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;
- stopping movement of the plastic zipper in a sandwiched condition; and
- hot stamping and detachably welding the top surfaces located at the mouth side of the stopped plastic zipper by means of a heating member having an edge parallel to the guide rails.
- Further, according to the present invention, the above-described object is achieved by a method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
- supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, and a tear tape having easily peelable plastic layer formed on one surface thereof to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails, said easily peelable plastic layer of said tear tape being supplied in a condition wherein it is capable of in contact with the top surfaces located at the mouth side of the plastic zipper;
- guiding the outer surfaces located at an open end of the plastic zipper into the space located between said guide rails, and guiding said tear tape into said space, and at the same time, sandwiching the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;
- stopping movement of the plastic zipper and the tear tape in a sandwiched condition;
- inserting a heating member having an edge parallel to the guide rails into said space between said guide rails; and
- hot stamping the top surfaces located at the mouth side of the stopped plastic zipper and said tear tape by means of a heating member so as to detachably weld the top surfaces located at the mouth side of the plastic zipper with said easily peelable plastic layer of said tear tape.
- In the above-described manufacturing method, although the welding is performed by using a heating member having an edge parallel to the guide rails while the plastic zipper, or the plastic zipper and the tear tape are in a stopped condition, the welding may be performed in a moving condition. In this latter case, in the above-described manufacturing apparatus, welding may be performed by continuous hot stamping by using rotatable heated circular disk having a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member.
- According to the present invention, the above-described object is achieved by a plastic zipper having preventing function against unfairly unsealing characterized in that the plastic zipper has a pair of engaging portions and is located on surfaces of plastic films, and a tear tape is detachably welded to the top surfaces of the plastic zipper at the mouth side thereof along a longitudinal direction of the plastic zipper.
- In this case, it is preferred that width of the detachable tear tape is in a range between not less than 0.5 mm and the amount which is obtained by adding 4 mm to the thickness of the zipper. The detachable tear tape may be welded continuously in a direction of the plastic zipper or may be welded along a dotted line extending in a longitudinal direction of the plastic zipper.
- It is preferred that the plastic zipper of the present invention is provided with a slider.
- Further, according to the present invention, the above-described object is achieved by a bag body equipped with a plastic zipper having preventing function against unfairly unsealing characterized in that the plastic zipper, which has a tear tape detachably welded on top surfaces thereof located at its mouth side or which has top surfaces located at its mouth side continuously welded thereto, is fitted at a mouth portion of the bag body.
- According to the manufacturing apparatus and the manufacturing method of the present invention, the plastic zipper, the top surfaces of which located at the mouth side is detachably welded in a longitudinal direction, or which has a tear tape having easily peelable plastic layer detachably welded at the top surfaces located at the mouth side thereof, can be produced industrially and effectively.
- Since the plastic zipper of the present invention has the tear tape having the easily peelable plastic layer detachably welded at the top surfaces located at the mouth side thereof, the tear tape will be peeled off when the plastic zipper is subjected to unfair or erroneous unsealing. Under such a condition, even if a person who has performed unfair action tries to return it to its former condition, the former condition cannot be returned any more. Further, the fact wherein the unsealing operation has be done can be understood at a glance from its appearance. Especially when the tear tape is used, even if a part of the tear tape has been peeled off, the fact wherein the unsealing operation has been done can be understood at a glance, since the peeled off portion flutters. Further, in the event wherein the tear tape has cuts made from the side edge thereof and a plurality of slits are formed, the tear tape will be cut off, when the tear tape is subjected to a peeling off operation from the side edge, and accordingly, it can be understood that it has been subjected to an unfair unsealing operation. In the case of the plastic zipper with the slider, if such slits are obliquely cut towards the closed end of the zipper, the tear tape will be cut off or peeled off when the slider is moved with the tear tape adhered thereto, and accordingly, it can be understood that it has been subjected to an unfair or erroneous unsealing operation.
- Also in the case of the plastic zipper which has the top surfaces at the mouth side continuously welded to each other in a longitudinal direction, the welded portion of the top surfaces at the mouth side will be cut off or broken when the plastic zipper is unfairly or erroneously unsealed, and accordingly, the fact wherein the unsealing operation has be done can be understood at a glance.
- As described above, because everyone can understand easily that unsealing operation has been done from the appearance, an intention to try to unfairly unseal is ceased. Therefore, it can prevent unfair unsealing.
- Since the plastic zipper of the present invention can be produced industrially by using a manufacturing apparatus, it can be produced effectively.
- Further, when the function of the present invention for preventing unfairly unsealing is added to such a hermetic plastic zipper as disclosed in
Patent document 1 or 2 wherein engaging portions comprise a pair of male and the female hooks and which has a continuous tightening wall inside one of the hooks and a continuous pressing rib inside the other hook, a bag with slider can be provided which is used with assumption of long time preservation and hermetical re-seal after unsealing. - The present invention will now be explained in detail based on the embodiments illustrated in the drawings.
- The plastic zipper, which is an object of the present invention, may have engaging portions formed in any shape as long as it has a pair of engaging
portions - In the present invention, the phrase “top surface located at the mouth side of the plastic zipper” means the portion located at the edge of the mouth side, and the engaging portion may be the edge, and alternatively, the flange portion may be the edge, and further, the edge may be in a flat surface or in a curved surface, and its shape is not limited particularly.
- The engaging portions of the
plastic zipper 1 in the embodiment illustrated inFIGS. 1 and 2 comprise a pair of male andfemale hooks FIG. 2 .) of the engaging portion located at mouth side are the top surfaces located at the mouth side of the plastic zipper. - In
FIGS. 1 and 2 , a pair of long andslender guide rails guide rails outer surfaces plastic zipper 1, and the edges located at the mouth side are inserted into the space between theguide rails tear tape 5 is also inserted into the space between the guide rails TA and TB. Thetear tape 5 has easilypeelable plastic layer 5E on one surface thereof, and this easilypeelable plastic layer 5E is so inserted that it becomes in contact with the top surfaces TA and TB located at mouth side of theplastic zipper 1. - As illustrated in
FIG. 1 andFIG. 2 , multiple sets ofguide rollers rails guide rails guide rollers plastic zipper 1 located at the side of the contents. Theaxes guide rollers guide rails guide roller rotating axis - A
heating member 4 is disposed facing to a space formed between the twoguide rails guide rollers guide rails heating member 4 is connected to a moving means 6, for example, an actuator, which can cause theheating member 4 its approaching and departing movements relative to theguide rails heating member 4 is used for heating the top surfaces TA and TB at the mouth side of theplastic zipper 1 which is sandwiched by theguide rails guide rails FIGS. 1 and 2 , and it heats up thetear tape 5 and the top surfaces TA and TB at the mouth side of theplastic zipper 1, in the embodiment illustrated inFIGS. 1 and 2 . - In the embodiment illustrated in
FIGS. 1 and 2 , theheating member 4 is a plate member having anedge 4A parallel to theguide rails fringe 4B of theedge 4A is straight. When thefringe 4A of theheating member 4 is straight, it can form a continuous welded portion. Although it is not illustrated in the drawings, thefringe 4B of theedge 4A of theheating member 4 may be uneven, and in this case, it can form welded portions along a dotted line. - In the embodiment illustrated in
FIGS. 1 and 2 , the welding operation of thetear tape 5 to the top surfaces at the mouth side of theplastic zipper 1 is done as follows. - The
plastic zipper 1 and thetear tape 5 are forwarded between theguide rails guide rollers peelable plastic layer 5E on thetear tape 5 is able to be in contact with the top surfaces TA and TB at the mouth side of theplastic zipper 1, and theouter surfaces plastic zipper 1 are guided into the space between theguide rails tear tape 5 is also guided into the space. At the same time, the plastic films F and F located near the engagingportions plastic zipper 1 are sandwiched by each set of theguide rollers plastic zipper 1 and thetear tape 5 are stopped. Under this stopped condition, the top surfaces TA and TB at the mouth side of theplastic zipper 1 sandwiched by theguide rails peelable plastic layer 5E of thetear tape 5 are in a condition wherein they keep their contact. In the present invention, the phrase “in a condition wherein they keep their contact” means that they are in a condition wherein thetear tape 5 and the top surfaces TA and TB at the mouth side of theplastic zipper 1 are in parallel to each other and become close so that they are in contact with each other or slightly away from each other. - Then, the
actuator 6 is operated, and the plate shaped heating member 42 which has been positioned at the waiting position is advanced to a position illustrated in an alternate long and two short dashes line, and is inserted into the space between theguide rails heating member 4 is pressed to the stopped top surfaces TA and TB at the mouth side of theplastic zipper 1 and thetear tape 5 to hot stamp them. The easilypeelable plastic layer 5E of thetear tape 5 is melt by the hot stamping, and thetear tape 5 is detachably welded to the top surfaces TA and TB at the mouth side of theplastic zipper 1. In this occasion, the welded pattern is determined by the shape of thefringe 4B of theedge 4A of the plate shapedheating member 4. In other words, when thefringe 4B is straight, it is welded in a strait line, and when thefringe 4B is uneven, it is welded along a dotted line. Thereafter, the actuator is operated again, and the plate shapedheating member 4 returns to its waiting position. - After the welding operation has been finished, the
plastic zipper 1 and thetear tape 5 are transferred in a direction of an arrow indicated by OUT inFIG. 1 , and in the space between theguide rails plastic zipper 1 and thetear tape 5, both of which have not been welded yet, are transferred from a direction indicated by arrow IN to a direction indicated by an arrow OUT. - By repeating the above-described welding operation,
plastic zippers 1, which havetear tapes 5 welded to the top surfaces TA and TB at mouth side thereof, can be produced continuously. - As described above, according to the embodiment illustrated in
FIGS. 1 and 2 , theplastic zipper 1, which comprises a pair of male andfemale hooks tear tape 5 welded to the top surfaces TA and TB at mouth side thereof, is produced. -
FIG. 3 illustrates another embodiment of the plastic zipper which can be produced by the apparatus illustrated inFIGS. 1 and 2 . In the embodiment illustrated inFIG. 3 , notear tape 5 is used, but the welded portion TS which continuously extends in a longitudinal direction of the zipper is formed by welding the top surfaces TA and TB at mouth side of thezipper 1 with other. - Such a welded portion TS is formed as follows. In the apparatus illustrated in
FIGS. 1 and 2 , a plastic film F with a long sized plastic zipper having a pair of engagingportions guide rail guide rollers outer surface 1C of the top surfaces at the mouth side of the plastic zipper is guided to the space between theguide rails portions guide rollers heating member 4 having astraight fringe 4B at theedge 4A is inserted into the space between theguide rail straight fringe 4B, and thus, a welded portion TS which continuously extends in a longitudinal direction of the zipper is formed. - Thereafter, the plastic film F is transferred in a direction indicated by OUT, and a slider is fitted therewith. Then, heat sealing HS is done perpendicular to a longitudinal direction of the plastic film F, and the open mouth for filling is sealed off after the contents have been filled up, and cutting off operation is carried out at the heat sealed portion HS. According to the above-described steps, bag bodies filled up with the contents and having plastic zippers which provide a preventing function against unfairly unsealing are produced.
- In order to produce a product which has the welded top surfaces TA and TB at the mouth side of the plastic zipper as illustrated in
FIG. 3 , at least a part of the top surfaces TA and TB at the mouth side of the engaging portion is made overlapped. It is preferred that easily peelable plastic layer is formed on one of the overlapped portions at top surfaces TA and TB at the mouth. When the above-described steps have been carried out, the welded portion TS extending in a longitudinal direction of the zipper can be easily cut off by the slider. -
FIG. 4 , which is a perspective view similar toFIG. 1 , shows another embodiment of an apparatus for manufacturing a plastic zipper of the present invention, which has a preventing function against unfairly unsealing, andFIG. 5 is a cross sectional view taken along lines B-B′ inFIG. 4 . In the above-described embodiment illustrated inFIGS. 1 and 2 , the welding operation was performed in a condition wherein theplastic zipper 1 and thetear tape 5 were stopped. Contrary to this, the embodiment illustrated inFIGS. 4 and 5 is an apparatus for welding a moving tear tape to a the plastic zipper. Theguide rollers guide rails FIGS. 1 and 2 . In the embodiment illustrated inFIGS. 4 and 5 , theheating member 4 is a rotatable circular disk. The heatingcircular disk 4 is rotatably supported around the rotatingaxis 7, and it is connected to a moving means 6, for example, an actuator, which causes approaching and departing movements relative to theguide rail rotating axis 7 is disposed perpendicular to a longitudinal direction of the guide rails and a transferring direction of theheating disk 4. When the fringe of the heatingcircular disk 4 is in a smooth round shape, a continuous welded portion can be formed, and when the fringe of theheating rotating disk 4 is formed in a cogwheel shape, dotted welding portions can be formed. - In order to weld the
tear tape 5 to the top surfaces at mouth side of theplastic zipper 1 in the embodiment illustrated inFIGS. 4 and 5 , the following operation is carried out. - The
plastic zipper 1, which has a pair of engagingportions tear tape 5, which has the easilypeelable plastic layer 5E on one side, are supplied from the plastic zipper supplying device and from the tear tape supplying device, both of which are not illustrated, between the long andslender guide rails guide rollers FIGS. 1 and 2 , while the easilypeelable plastic layer 5E of thetear tape 5 is made in a condition wherein it is in contact with the top surfaces TA and TB at the mouth side of theplastic zipper 1, theouter surfaces guide rails tear tape 5 is also guided into the space. At the same time, the plastic films F and F which are near the engagedportions plastic zipper 1 located at the contents side are sandwiched by each set ofguide rollers plastic zipper 1 and thetear tape 5 while they are moving, the rotatable heatingcircular disk 4 is advanced to a position illustrated in an alternate long and two short dashes line, and it is inserted into the space between theguide rails circular disk 4 at the advanced position presses thetear tape 5 against the top surfaces TA and TB at the mouth side of theplastic zipper 1, and it performs hot stamping operation together with the movements of theplastic zipper 1 and thetear tape 5 while it is rotating in a transferring direction. Thus, the top surfaces TA and TB at mouth side of theplastic zipper 1 and the easilypeelable plastic layer 5E of thetear tape 5 are detachably welded with each other. - In this embodiment, because the heating
circular disk 4 can move between the advanced position illustrated in an alternate long and two short dashes line and a waiting position illustrated in a continuous line, by continuously moving theplastic zipper 1 and thetear tape 5 while the heatingcircular disk 4 is stopped at the advanced position, the welding can be done continuously. Further, while theplastic zipper 1 and thetear tape 5 are moving continuously, the welding can be done intermittently by reciprocating the heatingcircular disk 4 between the advanced position and the waiting position. - Also in the apparatus illustrated in
FIGS. 4 and 5 , by performing hot stamping without usingtear tape 5, such aplastic zipper 1 as illustrated inFIG. 3 , wherein the top surfaces TA and TB at the mouth side of theplastic zipper 1 has been welded, can be manufactured. - In order to sandwich the plastic films F and F near the engaging portion located at contents side of the
plastic zipper 1, the inventor of the present application has conducted an investigation wherein the guide rails similar to theguide rails guide rollers heating member 4 is pressed to the top surfaces TA and TB at the mouth side of the plastic zipper, and accordingly, when the plastic zipper moves in a lengthwise direction, the frictional resistance in a moving direction is generated, and the frictional resistance fluctuates widely with lapse of time, i.e., frictional resistance highly increases or decreases with lapse of time. Thus, there is a risk that at a velocity of about 30 m/min, which is required to a conventional bag producing machine, the zipper tape may be prolonged, or it may be deformed by heat caused by the frictional resistance or by prolongation. Therefore, it is not so practical to use guide rails for sandwiching plastic films at the contents side. - On the contrary, when the guide rollers are used like the present invention, even if the base portion at the engaging portion of the zipper strongly gnaws into the guide rails, when the plastic zipper moves in a lengthwise direction, the frictional resistance in a moving direction is extremely small. Especially, in the case of rollers with bearings, the frictional resistance is scarcely generated.
- As for the frictional resistance, taking into consideration the thickness of edge portion at mouth side of the plastic zipper, the frictional resistance can be decreased by adjusting the space between the
guide rails outer surfaces plastic zipper 1, at an appropriate value. - Further, in order to guide the two
outer surfaces plastic zipper 1 and thetear tape 5, the inventor of the present invention has conducted an investigation, wherein guide rollers similar to theguide rollers guide rails guide rails - Another embodiment of
guide rails FIG. 6 . AlthoughFIGS. 6( a) and 6(b) are views corresponding to the cross sectional view taken along A-A′ inFIG. 1 , respectively, they show different embodiments, respectively. - In the embodiment illustrated in
FIG. 6( a), though eachguide rail grooves tear tape 5 enters in thesegrooves plastic zipper 1 of this embodiment is of a type wherein the flange portions FLA and FLB projecting from the engagingportions portions guide rails FIGS. 1 and 2 , however, the space between theguide rails heating member 4 is inserted is wider so that inserting operation can be done easily. - When
such guide rails FIG. 6( a) are used, thetear tape 5 can be surely guided, and the contact between thetear tape 5 and the top surfaces at the mouth side of the plastic zipper, i.e., the flange portions FLA and FLB in this embodiment, can be kept. Further, when the velocity of thetear tape 5 changes suddenly, the tape may undulate, however, if theguide rails FIG. 6( a) are used, such problem does not occur because the edges of thetear tape 5 are guided by thegrooves - In the embodiment illustrated in
FIG. 6( b), theplastic zipper 1 has flange portions FLA and FLB, and the edges of the flange portions have protrusions FPA and FPB formed thereon. The engagingportions FIG. 1 toFIG. 6( a) and comprise a pair of hooks, the female hook of which has a continuous pressing rib, and the male hook of which has a continuous tightening wall. In this embodiment, theguide rails guide rails plastic zipper 1, i.e., the protrusions FPA and FPB in this embodiment, have easily peelable plastic layer formed thereon, they are suitable for welding with each other. - Further, in the embodiment illustrated in
FIGS. 6( a) and 6(b), theguide rollers heating member 4 are similar to those of the above-explained embodiments illustrated inFIGS. 1 and 2 and inFIGS. 4 and 5 , and also the welding method can be carried out along the lines explained with regard to these embodiments. -
FIGS. 7( a) and 7(b) are perspective views of a plastic zipper according to another embodiment of the present invention, andFIG. 7( a) shows the situation wherein the tear tape is welded, andFIG. 7( b) shows the situation wherein a part of the tear tape is peeled off. Similar to the plastic zipper illustrated inFIG. 6( a), theplastic zipper 1 of this embodiment has the flange portions FLA and FLB extending outward from the engagingportions tear tape 5 is welded to the top surfaces TA and TB at mouth side along a broken line. When welding has been done along such a broken line, since concentrated stress acts on the peeled off portion TS when it is peeled off, there is an advantage that thetear tape 5 can be easily peeled off even if the peel off intensity is strong. - In the present invention, the phrase “weld along a broken line” means that the shape of the welded portion TS is formed by short straight lines which continue intermittently, it is a dotted line comprising a plurality of dots and formed in a round shape, a square shape or a designed pattern, or it is a mixture of short straight lines and dot lines, and it is not limited to the case wherein a tear tape is used, but it also includes the case wherein the top surfaces at mouth side of the zipper are directly welded, too.
- It is preferred that the
tear tape 5 hasslits 5A cut from the edge thereof and spaced in a lengthwise direction thereof as illustrated inFIGS. 7( a) and 7(b). When such slits 5A are formed, thetear tape 5 will be cut off on its way because of theslits 5A, if it is tried to peel off thetear tape 5 from the side, namely from the edge. Therefore, unfair peeling off can become clear. - Furthermore, it is preferred that the
tear tape 5 is cut obliquely, namely forming an angle of less than 90°, from the side edge toward the closed end of the plastic zipper. When such slits 5A are formed, thetear tape 5 can be peeled off continuously without cutting off on its way, when thetear tape 5 is pulled and peeled off from the opening end of zipper towards its closing end. - In the case of a plastic zipper with a slider, when the slider is forcibly moved, under a condition wherein a tear tape is adhered thereto, from the closing end of the zipper towards its opening end, since the
tear tape 5 is cut off or torn off by the movement of the slider, unfairly unsealing can be known at a glance. In this case, it is preferred that the angle of the slit is in a range from 20° to 60°. When the angle θ is below 20°, since the length of theslit 5A becomes too long, there occurs a risk that the slit portion hangs down and that its appearance becomes bad. When the angle θ is more than 60°, since the peeling strength at the easily peelable portion TS of thetear tape 5 becomes weaker than the cutting off strength of thetear tape 5, only the easily peelable portion TS is peeled off while thetear tape 5 is not cut off, and therefore, there is a risk that unfair peeling off is unclear. - The position of the
slits 5A in thetear tape 5, i.e., the space between the slits, and the number of theslits 5A are not particularly limited, as long as they are in ranges wherein unfair peeling off can be understood, and they may be formed uniformly in a lengthwise direction, and alternatively, they may be formed at a part of the lengthwise direction. Preferably, they are formed on both the sides of the tear tape as illustrated. - It is preferred that the width n (in mm) of the
tear tape 5 is within a following range of inequality wherein the thickness of the top surfaces at the mouth side stands for m (in mm). 0.5≦n≦m+4 (in mm) - Namely, if the width n (in mm) of the
tear tape 5 is less than 0.5 mm, there is a possibility that thetear tape 5 may be cut off when it is peeled off, and contrary to this, when the width n is beyond (m+4) mm, there is a possibility that the tear tape may bulge out from the slider at the slider disposing position and may cause bad appearance. Further when theslits 5A are formed in thetear tape 5, it is preferred that the width of the remaining portion where theslit 5A exists, i.e., the portion which is not cut, is not less than 0.5 mm. -
FIG. 8 is a perspective view showing another embodiment of the guide rails of the present invention, and the guide rollers and the heating member are omitted their illustration. The guide rails 3A and 3B in this embodiment have the cross sectional shapes similar to those illustrated inFIG. 6( a). The twoguide rails portion 3D, preferably two or more than two connecting portions, which connects them to each other at the heating member side which is not illustrated. When such a connectingportion 3D is disposed, even if the velocity of thetear tape 5 may change suddenly, and the tape may undulate so that it tends to come out from thegrooves 3C formed on theguide rails portion 3D can restrict such movement of thetear tape 5 and can prevent its coming out from thegrooves 3C. Therefore, the producing speed, i.e., moving velocities of theplastic zipper 1 and thetear tape 5, can be enhanced. - When the bag body provided with the plastic zipper of the present invention and having contents filled therein is manufactured, any one of the following methods may be accepted.
- After contents are filled in conventional bags, the zippers are closed, and then, the top surfaces TA and TB at the mouth side are welded directly or using the tear tape by mean of the methods of the present invention. Thus, the bag bodies having the preventing function against unfairly unsealing are obtained.
- Alternatively, before contents are filled, the top surfaces TA and TB at the mouth side are welded directly or using the tear tape so that the bag bodies having the preventing function against unfairly unsealing are obtained, and then, contents are filled in the bag bodies through the mouth which has been open at the bottom or the side in accordance with the known method, thereafter, the filling open mouth is closed by the heat sealing. Thus, the bag bodies having the preventing function against unfairly unsealing are obtained.
- Comparing with the former and latter producing methods, the latter method is more preferable since it has high productivity.
- Furthermore, by carrying out the method of the present invention during the bag manufacturing process, bag bodies filled with contents which have been packed automatically can be produced.
- Based on
FIG. 9 , process for manufacturing bag bodies filled with contents which have been packed automatically during the bag manufacturing process will now be explained, as one embodiment of the method according to the present invention. - Two sheets of films which will constitute the bag body are withdrawn from film rolls Y1 and Y2, and they are supplied with a bag manufacturing machine through a dancer roll Y4. On the other hand, a hermetic zipper having male and female hooks welded at an engaging portion of the zipper via easily peelable plastic layer is withdrawn from a zipper roll Y3, and the zipper is intermittently welded to the films by means of a heat sealing machine Y9 after the zipper is set on a predetermined position on the film, and thus, the films having hermetic zipper fitted therewith are formed.
- After a point seal has been done at the portion which will be an end portion of the bag with zipper by means of an ultrasonic heat sealing machine Y9, the films having hermetic zipper fitted therewith are introduced into a zipper guide Y10 which comprises two
parallel guide rails guide rollers FIGS. 1 and 2 . On the other hand, a tear tape having easily peelable plastic layer formed thereon is withdrawn from a tear tape roll Y7 and is introduced into the zipper guide Y10 through a dancer roll Y8 while the tension therein is kept constant. In the zipper guide Y10, the tear tape and the top surfaces at the mouth side of the hermetic zipper are hot stamped intermittently by means of the welding device Y11 which comprises theheating member 4 and the moving means 6 of the apparatus according to the present invention and illustrated inFIGS. 1 and 2 , while they are kept in contact with each other. Thus, the portion for preventing unfairly unsealing wherein the tear tape is welded to the top surfaces at the mouth side of the zipper is formed. - In this case, the depth of the hot stamping can be set arbitrarily by adjusting the stroke of the moving
means 6, i.e., actuator, of the welding device Y11, and is preferably in a range between 0.1 mm and 0.5 mm. Although depending on the size preciseness of the zipper, in the case of less than 0.1 mm, there are possibilities to cause unevenness in the peeling strength of the tear tape or to form portions which are welded insufficiently, and in the case of more than 0.5 mm, there are possibilities to cause too strong peeling strength, to break the tear tape while it is being peeled off when its width is narrow, or to deform the zipper. - The films with the plastic zipper which have been fitted with the unfair unsealing preventing portions added thereto are subjected to unsealing preventing operation, such as forming slits at a predetermined positions at the closed end of the zipper, by means of a closed end manufacturing device Y12, and the slider is installed at the positions, where the unsealing preventing operation has been done, by means of an automatic slider installing device Y13. In this case, the slider is supplied from the automatic slider supplying device Y14.
- Thereafter, contents are filled in the bag body from its bottom by means of the filling machine Y16, after the zipper and the films of the bag body are heat sealed in a direction perpendicular to the zipper at a position which will become the edge of the bag body, by means of a vertical heat sealing machine Y15. Then, after the bottom is closed by means of the heat sealing machine Y17, the heat sealed portion of the zipper and the bag body is cut off by means of the guillotine cutter Y18 at the position which will become the edge of the bag body. As a result, the bag body Y19, i.e., the product, having filled contents therein and having the hermetic zipper with the slider which has a portion for preventing unfairly unsealing, can be produced.
- Further, in the case wherein the heat sealed portion of the zipper and the films of the bag body are cut off at a position which will be the edge of the bag body by means of the guillotine cutter Y18 without using the heat sealing machine Y17 nor the filling machine Y16, a bag body, having an open mouth at its bottom and having the hermetic zipper with the slider which has a portion for preventing unfairly unsealing, is obtained.
- Furthermore, the method about which the inventor of the present application previously explained in detail in Patent document 4 (Japanese Patent Laid-open No. 2004-209841) may be used as a method for automatically setting slider, and the method about which the inventor of the present application previously explained in detail in Patent document 5 (Japanese Patent Laid-open No. 2004-196321) may be used as a method for processing the closed end of the zipper.
- Another embodiment of the process which produces the plastic zipper having the preventing function against unfairly unsealing of the present invention is explained based on the process diagram illustrated in
FIG. 10 . - A tape-like plastic zipper wherein a hook of an engaging portion has not been welded is withdrawn from a zipper roll Y30, and the portion corresponding to easily peelable plastic layer on the hook of the plastic zipper is inserted between an ultrasonic horn H-1 and an anvil A-1 which are spaced at a constant distance, and then, the plastic zipper is passed through between the ultrasonic horn H-1 and the anvil A-1 at a constant velocity, and the easily peelable plastic layer on the hook is welded continuously by means of the ultrasonic wave. Subsequently, the plastic zipper having the hook welded thereto is fed into a zipper guide Y10 of the present invention, and while the tear tape is also supplied with from a tear tape roll Y7, hot stamping is done continuously by means of the welding device Y11 which comprises the
rotatable heating plate 4 and the moving means 6 as illustrated inFIGS. 4 and 5 . As a result, a hermetic zipper which has a portion for preventing unfairly unsealing can be continuously manufactured. Then, it is wound up into a zipper roll Y33. - When such a zipper roll Y33 which has a portion for preventing unfairly unsealing is fed into the process of the bag producing machine illustrated in
FIG. 9 , the tear tape roll Y7, the zipper guide Y10 and the welding device Y11 are not used in the process ofFIG. 9 . - Further, the inventor of the present application previously explained in detail the producing process of the hermetic zipper having hooks whose engaging portions are welded together through the easily peelable plastic layer in Patent document 1(WO 2005/048763 A1).
- A concrete embodiment of the present invention will now be explained based on
FIG. 9 . Dry laminated films were wound into film rolls Y1 and Y2, respectively, which films comprised linear low density polyethylene (L-LDPE) having a thickness of 40 micron at inside thereof and PET having a thickness of 20 micron at outside thereof. These films, used for constituting the bag body, were withdrawn from the film rolls Y1 and Y2, and were supplied with the bag manufacturing machine through the dancer roll Y4. - On the other hand, the hermetic zipper was wound onto the zipper roll Y3. This hermetic zipper was the plastic zipper like that illustrated in
FIG. 6( b), and it had a pair of engaging portions formed on the surface of the plastic film F formed in a tape shape and made of linear low density polyethylene (L-LDPE), the flange portion having protrusions at the edge thereof was disposed at the mouth side of the engaging portion, and the hook portions of the engaging portions were welded together through easily peelable plastic layer. The protrusions at the flange portions were required when they were opened by the slider, and the thickness of the protrusions which served as the top surfaces at the mouth side was 1.5 mm. - This hermetic zipper was withdrawn from the zipper roll Y3, and was set on a predetermined position on the films used for bag bodies which were fed from the film rolls Y1 and Y2, and then, the zipper was welded intermittently to the films by means of the heat sealing machine Y5 and Y6. In this manner, the films with the hermetic zipper were formed.
- After the zipper portion which would be the end of the bag body with the zipper was point sealed by means of the ultrasonic heat sealing machine Y9, these films with the hermetic zipper were guided to the zipper guide Y10 wherein such guide rails as illustrated in
FIG. 8 were disposed. The guide rails had a length of 400 mm and had two long and slender parallelepiped shapes which were spaced and positioned in parallel to each other, and had grooves, the depth q of which was 1 mm and width p of which was 1 mm, formed therein as illustrated inFIG. 8 , and the thickness S obtained by summing up that at the portion for holding the flange portion and that of the groove was 2 mm, and thickness t from the groove to the side near the heating member was 1 mm, and it was connected at nine places by means of the connectingportions 3D formed in a square pillar shape and having a thickness of 1 mm. Further, a set of two guide rollers in the zipper guide Y10 had a diameter of 12 mm, and 8 sets of such guide rollers were disposed. As illustrated inFIG. 6( a), the outer surfaces of the edges of the flange portions were sandwiched between the guide rails, and the plastic films at mouth side located near the engaging portion of the hermetic zipper were sandwiched between the guide rollers. - On the other hand, the tear tape, the width of which was 3 mm and the material of which was lamination of the polyethylene terephthalate (PET) resin having a thickness of 15 micron and the easily peelable resin having a thickness of 30 micron, was withdrawn from the tear tape roll Y7, and while the tension was kept at 60 gf, it was introduced into the groove of the guide rails of the zipper guide 10 through the dancer roll Y8. In a condition wherein the easily peelable plastic layer of the tear tape and the top surfaces at the mouth side of the hermetic zipper were kept in contact with each other, hot stamping in the depth of 0.3 mm was carried out intermittently by means of the welding device Y11, the temperature of which was kept at 190° C., the unfair unsealing preventing portions, where the tear tape was welded along a dotted line to the top surfaces at the mouth side of the zipper, were formed. The hot stamping portion, i.e., the shape of the edge, of the heating member in the welding device Y11 was constituted by the rectangles, which have a size of 0.8 mm×0.3 mm and which were aligned in a dotted line at an interval of 5 mm in a longitudinal direction, and the stamped shape was in a broken line.
- The films fitted with the plastic zipper having the unfair unsealing preventing portion were further transferred, and were added the preventing operation against unsealing, such as the cutting, at a predetermined position of the closed end of the zipper, and then, the slider was installed at the position, where the preventive operation against unsealing was performed, by means of the automatic slider setting device Y13. In this case, the slider was supplied from the automatic slider supplying device Y14.
- Subsequently, after the zipper and the films of the bag body were heat sealed in a direction perpendicular to the zipper at the position which would be the edge portion of the bag body, by means of the vertical heat sealing machine Y15, the heat sealed portion of the zipper and the films of the bag body was cut off at the position which would be the edge portion of the bag body by means of the guillotine cutter Y18. As a result, the bag body, having the hermetic zipper with the slider, which was provided with the preventing portion against unfairly unsealing, the length of whose zipper portion was 180 mm and whose depth was 260 mm, was obtained. (In this embodiment, the heat sealing machine Y17 and the filling machine Y 16, both of which were illustrated in
FIG. 9 , were not used.) - Such bag bodies could be produced at a speed of 50 bags per a minute. When twenty bags were extracted as samples from the produced bag bodies and the tear tapes were peeled off from the closed end of the zipper, the peeling intensity at 90 degree peeling off was 224 gf in the average and 41.9 gf in the standard deviation, respectively.
- Consequently, it was concluded that anybody could peel the tear tape off readily. Further, the tear tape which had been peeled off could not be resumed, and therefore, the prevention against unfairly unsealing was effective was confirmed, too.
- When the slider was slidably moved from the closed end towards the open end after the tear tape was peeled off, the plastic zipper which had been welded through the easily peelable plastic layer was easily peeled off, and the mouth was opened. Further, when the slider was slidably moved from the open end towards the closed end, the plastic zipper could be resealed.
-
FIG. 1 - It is a perspective view showing one embodiment of an apparatus for manufacturing a plastic zipper of the present invention with preventing function against unfairly unsealing together with a long plastic zipper and a long tear tape processed in this apparatus, and the long plastic zipper and the long tear tape are cross sectioned.
-
FIG. 2 - It is a cross sectional view taken along A-A′ in
FIG. 1 , wherein the hatching lines showing the cross section are partly omitted. -
FIG. 3 - It is a perspective view of one embodiment showing a bag body of the present invention which is equipped with a plastic zipper with preventing function against unfairly unsealing, and a part of which is illustrated in cross section.
-
FIG. 4 - It is a view showing another embodiment of an apparatus for manufacturing a plastic zipper of the present invention with preventing function against unfairly unsealing, and it is a perspective view similar to
FIG. 1 . -
FIG. 5 - It is a cross sectional view taken along B-B′ in
FIG. 4 , wherein the hatching lines showing the cross section are partly omitted. -
FIG. 6 - Although
FIGS. 6( a) and 6(b) are cross sectional views correspond to the cross section views taken along A-A′ inFIG. 1 , wherein the hatching lines showing the cross section are partly omitted, they show other embodiments, respectively. -
FIG. 7 -
FIGS. 7( a) and 7(b) are cross sectional views showing other embodiments of the plastic zipper of the present invention, andFIG. 7( a) shows the state wherein the tear tape is welded, andFIG. 7( b) shows the state wherein a part of the tear tape is peeled off. -
FIG. 8 - It is a perspective view showing another embodiment of a guide rail of the present invention.
-
FIG. 9 - It is a process flow diagram showing one embodiment of a process for producing the bag body having a plastic zipper with the slider and with function of preventing unfairly unsealing at the mouth portion of the present invention.
-
FIG. 10 - It is a process flow diagram showing another embodiment of the producing process for producing a bag body of the present invention having a plastic zipper with function of unfairly unsealing.
-
- 1 plastic zipper
- 1A, 1B engaging portion of a plastic zipper
- 2A, 2B guide roller
- 3A, 3B guide rail
- 4 heating member
- 5 tear tape
- 6 moving means
- F film
Claims (16)
1. An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
two long and slender guide rails are disposed in parallel to each other so as to guide outer surfaces located at an open end of the plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films;
multiple sets of guide rollers, a set of which consists of two pieces of rollers, are disposed facing to said guide rails so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper, an axis of each guide roller being positioned perpendicular to the guide rails, a heating member is disposed facing to a space formed between the two guide rails at a position opposite to the guide rollers relative to the guide rails; and
a moving means for causing approaching and departing movements to said heating member relative to the guide rails is disposed so as to heat up the top surface located at the mouth side of the plastic zipper.
2. An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
two long and slender guide rails are disposed in parallel to each other so as to guide outer surfaces located at an open end of the plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films;
multiple sets of guide-rollers, a set of which consists of two pieces of rollers, are disposed facing to said guide rails so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper, an axis of each guide roller being positioned perpendicular to the guide rails, a heating member is disposed facing to a space formed between the two guide rollers at a position opposite to the guide rollers relative to the guide rails;
a moving means for causing approaching and departing movements to said heating member relative to the guide rails is disposed so as to heat up the top surface located at the mouth side of the plastic zipper; and
a tear tape supply device for supplying a tear tape into the space formed between the guide rails is disposed.
3. An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing according to claim 1 , characterized in that said heating member is a plate member having an edge parallel to the guide rails, and a fringe of said edge is straight or uneven.
4. An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing according to claim 1 , characterized in that said heating member is a rotatable circular disk, and said circular disk has a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member.
5. An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing according to claim 1 , characterized in that said two guide rails are provided with at least one connecting portion, by which they are connected to each other, at the side of said heating member.
6. A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails so as to guide outer surfaces located at an open end of the plastic zipper into the space located between said guide rails and so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;
stopping movement of the plastic zipper in a sandwiched condition; and
hot stamping and detachably welding the top surfaces located at the mouth side of the stopped plastic zipper by means of a heating member having an edge parallel to the guide rails.
7. A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, and a tear tape having easily peelable plastic layer formed on one surface thereof to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails, said easily peelable plastic layer of said tear tape being supplied in a condition wherein it is capable of in contact with the top surfaces located at the mouth side of the plastic zipper;
guiding the outer surfaces located at an open end of the plastic zipper into the space located between said guide rails, and guiding said tear tape into said space, and at the same time, sandwiching the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;
stopping movement of the plastic zipper and the tear tape in a sandwiched condition;
inserting a heating member having an edge parallel to the guide rails into said space between said guide rails; and
hot stamping the top surfaces located at the mouth side of the stopped plastic zipper and said tear tape by means of a heating member so as to detachably weld the top surfaces located at the mouth side of the plastic zipper with said easily peelable plastic layer of said tear tape.
8. A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails so as to guide outer surfaces located at an open end of the plastic zipper into the space located between said guide rails and so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers; and
hot stamping and detachably welding the top surfaces located at the mouth side of the stopped plastic zipper by means of a rotatable heated circular disk having a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member while the plastic zipper is moving.
9. A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, and a tear tape having easily peelable plastic layer formed on one surface thereof to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails, said easily peelable plastic layer of said tear tape being supplied in a condition wherein it is capable of in contact with the top surfaces located at the mouth side of the plastic zipper;
guiding the outer surfaces located at an open end of the plastic zipper into the space located between said guide rails, and guiding said tear tape into said space, and at the same time, sandwiching the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;
inserting a rotatable heated circular disk having a rotating axis perpendicular to the moving direction of the heating member into said space between said guide rails; and
hot stamping the top surfaces located at the mouth side of the plastic zipper and said tear tape by means of said heated circular disk while the plastic zipper and the tear tape are moving so as to detachably weld the top surface located at the mouth side of the plastic zipper and said easily peelable plastic layer of said tear tape.
10. In a plastic zipper having a pair of engaging portions formed surfaces of plastic films, the plastic zipper having preventing function against unfairly unsealing characterized in that a tear tape is disposed in a longitudinal direction of the plastic zipper at mouth side of the plastic zipper, the tear tape being different from the plastic films and having easily peelable layer formed on one side thereof, the tear tape is detachably adhered to the top surfaces of the plastic zipper at the mouth side thereof via the easily peelable layer.
11. A plastic zipper having preventing function against unfairly unsealing according to claim 10 , characterized in that the width of the detachable tear tape is in a range between not less than 0.5 mm and the amount which is obtained by adding 4 mm to the thickness of the zipper.
12. A plastic zipper having preventing function against unfairly unsealing according to claim 10 , characterized in that the detachable tear tape has slits spaced in a longitudinal direction thereof by cutting from a side edge thereof.
13. A plastic zipper having preventing function against unfairly unsealing according to claim 12 , characterized in that the slits of said tear tape is formed in a state wherein they are cut obliquely towards a closed end of the plastic zipper.
14. A plastic zipper having preventing function against unfairly unsealing according to claim 10 , characterized in that the detachable tear tape is welded along a dotted line extending in a longitudinal direction of the plastic zipper.
15. A plastic zipper having preventing function against unfairly unsealing according to claim 10 , characterized in that the plastic zipper is equipped with a slider.
16. A bag body equipped with a plastic zipper having preventing function against unfairly unsealing according to claim 10 , characterized in that the plastic zipper is fitted at a mouth portion of the bag.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005016823 | 2005-09-13 | ||
JPPCT/JP2005/016823 | 2005-09-13 | ||
PCT/JP2005/017586 WO2007032093A1 (en) | 2005-09-13 | 2005-09-26 | Plastic fastener with unauthorized opening prevention function, and method and device for producing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090129708A1 true US20090129708A1 (en) | 2009-05-21 |
Family
ID=37864699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/066,692 Abandoned US20090129708A1 (en) | 2005-09-13 | 2005-09-26 | Plastic zipper having preventing function against unfairly unsealing, and the manufacturing method and manufacturing appartus thereof |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090129708A1 (en) |
EP (1) | EP1941990A4 (en) |
CN (1) | CN101263001B (en) |
WO (1) | WO2007032093A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022266115A1 (en) * | 2021-06-18 | 2022-12-22 | S. C. Johnson & Son, Inc. | Closure system for pouch or container |
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WO2022266115A1 (en) * | 2021-06-18 | 2022-12-22 | S. C. Johnson & Son, Inc. | Closure system for pouch or container |
US11772849B2 (en) | 2021-06-18 | 2023-10-03 | S. C. Johnson & Son, Inc. | Closure system for pouch or container |
Also Published As
Publication number | Publication date |
---|---|
EP1941990A4 (en) | 2008-11-19 |
EP1941990A1 (en) | 2008-07-09 |
CN101263001B (en) | 2010-09-15 |
CN101263001A (en) | 2008-09-10 |
WO2007032093A1 (en) | 2007-03-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |