CN1096391C

CN1096391C - Two-way anti-pull composite plastic film packing bag with good thermal sealing property

Info

Publication number: CN1096391C
Application number: CN00109908A
Authority: CN
Inventors: 甘国工
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-11
Filing date: 2000-07-11
Publication date: 2002-12-18
Anticipated expiration: 2020-07-11
Also published as: CN1280094A

Abstract

The present invention provides a package bag of a bidirectional stretching-resistance composite plastic film with excellent hot sealability. The package bag comprises a barrel-shaped bag body. The present invention is characterized in that the base material adopted by the barrel-shaped bag body is formed by simultaneously compounding with at least one layer of plastic film which is not stretched and oriented and has excellent heat sealability after compounded with at least one layer of warp unidirectional stretching plastic film and at least one layer of weft unidirectional stretching plastic film or is formed by simultaneously compounding with at least one layer of plastic film which is not stretched and oriented and has excellent heat sealability after compounded with at least one layer of plastic film whose warp stretching intensity is higher than weft stretching intensity and at least one layer of plastic film whose weft stretching intensity is higher than warp stretching intensity. The present invention has the advantages of high intensity, no leakage, slide prevention, favorable film performance and automatic package.

Description

The Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence

Technical field:

What the present invention relates to is a kind of improved packaging bag, particularly be a kind of Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence.

Background technology:

Plastics and coextrusion complex film are as the base material of packing and used quite general, for the waste that reduces resource with widen the field of application of plastic film in packing, people have utilized tensile strength after the plastic film hot-stretch orientation to increase the characteristics of this High molecular material molecule stretching orientation of 5 to 15 times, invention and the product that provides many stretched plastic films to make, polyethylene as unilateral stretching, polypropylene packaging film, in order to as packing with tie up purposes, the polyethylene of unilateral stretching, polypropylene, nylon, polyester silk or arrowband are as weaving, braiding, packaging bag is used.Silk after the special unilateral stretching or arrowband through the braiding back through, broadwise all has advantages of higher tensile strength, is a kind of packing of having many uses.

This technology that is used as the packaging bag base material and the product of acquisition of having woven after unilateral stretching compared with the packaging bag that original plastic film and coextrusion complex film are made, bears identical load-carrying and identical stretching resistance, and raw MAT'L can be saved more than 2 times.And use more reliable.Obviously packing cost can be lower than adopting plastic film and coextrusion complex film.

The packaging bag majority needs waterproof, antiseep and desired strength height, thus present more packing, still utilize through the silk of unilateral stretching or braiding back, arrowband again film come waterproof, antiseep.Because the requirement of weaving and intensity, must be carried out to the course of processing of silk or film forming or one-tenth fillet to plastics, the braiding process must be arranged, this braiding process is just as braiding the weaving cotton cloth of factory, technological process, both took a lot of work, time-consuming again, also the cloth of braiding must be remake once even the multiple film processing of secondary for waterproof, antiseep afterwards.When needs connect the cloth width of cloth when wide, also must connect the width of cloth to the edge fit processing of sewing.When bag, also must make one by one, also the automation of inconvenient baling line.When rising to, wage and treating cost cost balance out the cost of raw and processed materials of saving than aforementioned plastic film coextrusion complex film, people just begin one's study and invent new structural composite base material to replace woven cloth be the packing of base material, particularly woven cloth is that the packing of base material often need to use behind the multiple film, for the curtain coating of multiple film, often use the fusion index multiple pleurodiaphragmatic in terspace material bigger several times than knitting.Adding the bad general bagging of heat sealability and connecing the width of cloth all is that the width of cloth is sealed and connects in sewing, and inconvenience is used, and becomes the environmental protection public hazards, unfavorable environmental protection.

The compound film sheet that also has known packaging bag and base material to adopt to have biaxial tension diaphragm and unstretched plastics and plastic film to be composited, or the compound film sheet that is composited of unilateral stretching diaphragm and unstretched plastics and plastic film.Biaxial stretching film be extrudate flow Yangjing diaphragm or extrude blowfilm shaping tubular diaphragm below the above viscous state temperature of glassy state temperature through institute's external force of executing to warp-wise, broadwise respectively the hot-stretch Polymer that makes diaphragm through, latitude both direction generation molecular orientation effect and arrangement, and the stretching resistance of generation both direction, the tensile strength of both direction is than the compound film sheet that does not stretch and form, or the compound film sheet that is composited of unilateral stretching diaphragm and unstretched plastics and plastic film.Biaxial stretching film be extrudate flow Yangjing diaphragm or extrude blowfilm shaping tubular diaphragm below the above viscous state temperature of glassy state temperature through institute's external force of executing to warp-wise, broadwise respectively the hot-stretch Polymer that makes diaphragm through, latitude both direction generation molecular orientation effect and arrangement, and the stretching resistance of generation both direction, the tensile strength of both direction is all higher 5 to 10 times than the plastic film of the same basal area that does not stretch, and we can obtain the more not better base material of stretched plastic diaphragm performance of bidirectional stretch intensity to utilize this characteristic and processing technology.This film is widely used in food, electronic publication and clothing etc., but as the packing base material, it has a fatal weakness, it is exactly counter stress mouth tear resistance extreme difference, promptly in case there is a stress to produce, even a little pin hole begins to be easy to be torn from this hole, can not be used for anti tear or easily produce the packaging field of stress mouth.

The patent No. 97244530 discloses a kind of by warp, the compound bidirectional tensile plastic composite film sheet of latitude unilateral stretching plastic film.This compound film sheet is by warp, the compound bidirectional stretch compound film sheet of latitude unilateral stretching plastic film, it is characterized in that the plastic film of one deck warp direction stretching is at least arranged in the described compound film sheet, at least the plastic film of one deck broadwise stretching has tack coat between the plastic film that the plastic film of warp direction stretching and broadwise stretch.This compound film sheet has adopted the plastic film of warp direction stretching and the plastic film that broadwise stretches respectively at warp-wise and broadwise, therefore the tensile strength of two directions is all born by the unilateral stretching film of direction separately respectively, because of the unilateral stretching film itself has intensity the highest in the same film, therefore each to stretching resistance reached optimized matching, also be the maximum tensile strength.

This two-layer and tack coat or welding layer are combined as a whole, if produce stress mouth or breach, because of the effect of tack coat, breach tear by through, the two-layer quadrature of latitude promptly 90 ° of compound stretch film stop, and improved tear resistance greatly.

This film can also increase one deck warp direction stretching film or the compound with it more performance that gets of broadwise stretch film to the requirement through the tensile strength of, latitude both direction according to usage condition.

This film is used for packing, has overcome the weakness of aforementioned various films, has saved resource, has been beneficial to and reclaims and environmental protection.

But, it is more very difficult that fusion between the unilateral stretching between film and the biaxial stretching film connects, because want fusion to connect will to make the film fusion of junction, just destroyed the stretch orientation Polymer and arranged orientation and intensity, can reduce seal, the tensile strength values of interface.So for the higher packaging bag of ask for something seal and automatic packaging line on seal, can only adopt stick bonding, limited the field of application of this film.

Summary of the invention:

In view of above reason, the objective of the invention is in order to overcome above deficiency, a kind of intensity height is provided, non-leakage, anti-skidding, save material, film properties is good, and packing can realize automation, applied range, recyclable utilization is beneficial to the Bidiretional tension-resistant packing bag of composite plastic film of the heat sealability excellence of environmental protection.

The object of the present invention is achieved like this:

Packaging bag of the present invention comprises the tubular bag; ； Between stretched plastics diaphragm adhesive layer is arranged, adopt the plastics diaphragm of heat-sealing excellent performance to have melting connection or anti-piercing function.

It is to form plastic film is stretched that above-mentioned warp-wise tensile strength is higher than the plastic film of broadwise tensile strength, plastic film that the broadwise tensile strength is higher than the warp-wise tensile strength.

Between above-mentioned plastic film adhesive layer is arranged.

Have at least in the above-mentioned compound film sheet one deck through warp direction stretching or the warp-wise tensile strength is higher than the plastic film of broadwise tensile strength or the plastic film that stretches through broadwise or the broadwise tensile strength is higher than the broadwise tensile strength is respectively to be extruded by extruder by multiple different material to make.

Above-mentioned compound film sheet is no seam tubular diaphragm.

Above-mentioned compound film sheet is a flat diaphragm, and the tubular bag is by behind the flat diaphragm overlap joint, forms with welding or bonding way.

Have anti-skidding on the outer diaphragm of the tubular bag that above-mentioned bidirectional tensile plastic composite film sheet is made and concavo-convex muscle line that gain in strength.

Seal in addition in the above-mentioned packaging bag or the bag end of discharge port, breakdown is arranged or irritate the sack of sack.

Packaging bag compound film sheet of the present invention after on, latitude both direction, all having brought into play plastics unilateral stretching Polymer and having aligned tensile strength than the stretched plastic diaphragm is not high 5 to 15 times, bidirectional stretch intensity height.Compound film sheet has also adopted the plastic film of the heat sealability excellence that one deck at least do not stretch, and more conveniently seals connection.

Packaging bag tensile strength height of the present invention, non-leakage, anti-skidding, save material, film properties is good, and packing can realize automation, applied range, recyclable utilization is beneficial to environmental protection.

Description of drawings:

Fig. 1 is compound film sheet structural representation Fig. 1.

Fig. 2 is compound film sheet structural representation Fig. 2.

Fig. 3 is compound film sheet structural representation Fig. 3.

Fig. 4 is I, the II portion enlarged drawing among Fig. 2, Fig. 3.

Fig. 5 is broadwise stretch film 7 structural representations among Fig. 2, Fig. 3.

Fig. 6 is warp direction stretching film 9 structural representations among Fig. 2, Fig. 3.

Fig. 7 is compound film sheet structural representation Fig. 4.

Fig. 8 is compound film sheet structural representation Fig. 5.

Fig. 9 is the embodiment of the invention 1 figure.

Figure 10 is a packaging bag enclosing constitution diagram among Fig. 9.

Figure 11 is the embodiment of the invention 2 figure.

Figure 13 is the embodiment of the invention 3 structural representations.

Figure 14 is the block diagram of Figure 13.

Figure 15 is the embodiment of the invention 4 structural representations.

Figure 16 is the I portion enlarged drawing among Figure 15.

The specific embodiment:

Referring to Fig. 1, high density polyethylene (HDPE) (HDPE) plastic film 2 of the broadwise stretching (or the broadwise tensile strength is higher than the warp-wise tensile strength) that employing hot pressing compound (or it is compound to extrude curtain coating) becomes one with it on the LDPE (Low-density polyethylene plastics) diaphragm (LDPE) 1 of the heat sealability excellence that do not stretch in the bidirectional tensile plastic composite film sheet of heat sealability excellence is by the plastic film 4 of ethene-vinyl acetate resin copolymer (FVA) adhesive layer 3 with plastic film 2 bonded assembly warp direction stretchings (or the warp-wise tensile strength is higher than the broadwise tensile strength).

Compound film sheet shown in Fig. 2 is a flat diaphragm, and the compound film sheet shown in Fig. 3 is that tubular does not have seam composite plastic film sheet.Its structure is basic identical with compound film sheet shown in Figure 1.The plastic film 5 that comprises the LDPE (also can be LLDPE) of the heat sealability excellence of the not stretch orientation that is bonded as one by adhesive layer 6,8, broadwise stretched plastic diaphragm 7, warp direction stretching plastic film 9.Plastic film 5 can overcome that unilateral stretching is intermembranous, the intermembranous fusion bonded assembly deficiency that is difficult for of biaxial tension, make place that the heat-sealing mouth etc. of tubular package bag needs welding more failure-free connect, also can keep original tensile strength that compound film sheet is located in sealing part, seam (envelope) simultaneously.Fig. 4 is I among Fig. 2, Fig. 3, II portion enlarged diagram.The outer warp direction stretching film 9 of the warp direction stretching film 9 of Fig. 2 and Fig. 3 has anti-skidding and concavo-convex muscle line 10 that gain in strength as shown in Figure 4, this concavo-convex muscle line is arranged along warp-wise (vertically) draw direction, the general concavo-convex discrepancy in elevation is 1/2 to 1/3 of sublevel warp direction stretching film thickness, and the purposes that film is looked in concavo-convex spacing distance distribution can change.This concavo-convex muscle line can be simultaneously at two surface distributions, also can a surface distribution in office, can not distribute yet.Broadwise stretch film 7 and warp direction stretching film 9 are extruded different material with multi-layer co-extruded machine and are made two-layer co-extruded films again through warp-wise or broadwise stretching when producing film respectively.See Fig. 5, broadwise stretch film 7 is obtained by high density polyethylene (HDPE) 11 and linear polyethylene 12 coextrusion, sees that Fig. 6 warp direction stretching film 9 is obtained by high density polyethylene (HDPE) 13 and linear polyethylene 14 coextrusion.Can select different raw materials to improve flexibility, tear resistance and the heat sealability of diaphragm by two-layer co-extrusion.

Fig. 7 has provided another structural representation of compound film sheet.Compound film sheet among Fig. 7 is basic identical with compound film sheet shown in Fig. 2, promptly comprise unstretching film 15, adhesive layer 17, broadwise stretch film 18, adhesive layer 19, warp direction stretching film 20, not existing together is in order to increase the broadwise tensile strength, to have increased broadwise stretching film 16 at unstretching film 15 and 17 of adhesive layers.

Fig. 8 has provided a structural representation again of compound film sheet.Compound film sheet among Fig. 8 is basic identical with compound film sheet shown in Figure 1, promptly comprise unstretching film 21, broadwise stretch film 22, adhesive layer 23, warp direction stretching film 24, it is easy to connect for fusion not existing together, and increases the tear-resistant of film and puncture ability simultaneously, compound one deck unstretching film 25 on warp direction stretching film 24.Two layers of

unidirectional stretch film

22,24 is mainly born tensile strength, and two-layer unstretching film is mainly born fusion and connected and the anti-function that punctures, and adopts the LLDPE plastics.

Above-mentioned these films are used to make packaging bag, because of the plastic layer of the heat sealability excellence that does not stretch is arranged, be more convenient for the bag heat-sealing, and sealing-strength height, baling line can be realized automation, the compound intensity height that respectively has of stretch film and stretch film in addition, air permeability energy, resistance to heat, optical property improve, the performance of tear-resistant, puncture, is a kind of compound package material of preferable performance excellence.

Embodiment 1:

Fig. 9, Figure 10 have provided embodiment 1 structural representation.This packaging bag is the packaging bag made from bidirectional tensile plastic composite film sheet shown in Figure 3.The tubular bag 26 that this bag adopts tubular bidirectional tensile plastic composite film sheet to make, the below of bag be a bag end 27, adopt method of heating such as high frequency to seal bag at the bottom of, the heat-sealing sack generally is to seal after packing material is packed into again, the 28th, seal sack.Seal the bag end and sack when this bag can be packed with the tubular bidirectional tensile plastic composite film sheet of rolling and form packaging bag on automatic packaging line.

Embodiment 2:

Figure 11 has provided embodiment 2 structural representations.Present embodiment 2 packaging bag tubular bags 29 are to have adopted tubular bidirectional tensile plastic composite film sheet, the socket self-sealing filling exit 30 that has plastic film to make, and this plastic film is sewed on or is bonded on the tubular compound film sheet.The heat-sealing bag end 31 and heat-sealing sack 32 (diaphragm of use can have the plastic membranous layer of the heat sealability excellence that also can not stretch) are arranged.

Embodiment 3:

Figure 12 has provided embodiment 3 structural representations.This is the flexible freight container of 0.5 ton, 1 ton and 2 tons article of packing.Comprise the tubular bag 33 that adopts bidirectional stretch tubular composite plastic film sheet to make, thick 1 to 2 times of the pouch diaphragm of 25 kilograms or the 50 kilograms dresses that compound film sheet is more common.34 is that cylindrical sheet with bag is folded into and after square back adds coating adhesive with the flat film compound film sheet of bidirectional stretch burst is bonded (or the surface has the flat film compound film sheet heat-sealing of bidirectional stretch of heat sealability excellence to form) at the bottom of this bag.Suspender belt 35 is that unilateral stretching diaphragm or arrowband are made, can be with 0.5 ton to 2 tons goods packing and handling by catching the bottom.Sequence number 36 is sacks of the band filling exit made of bidirectional tensile plastic composite film sheet or general plastic film.This bag can be packed the chemical that antiseep is had relatively high expectations.

Embodiment 4:

Figure 13, Figure 14 have provided embodiment 4 structural representations.Tubular bag 37 be with flat film compound film sheet become on the tube Bag Making Machine with the diathermic heating mode extrude molten plastic or the adhesive agent mode with the welding of diaphragm lap-joint or bond together.The heat-sealing bag ends 38 usefulness diathermic heating mode seals.The diaphragm that uses can have the plastic membranous layer that also can not have unstretched heat sealability excellence.Sequence number 39 is sacks.

Embodiment 5:

Figure 15, Figure 16 have provided embodiment 5 structural representations.Present embodiment 5 is basic same with embodiment 1.Not existing together is the concavo-convex muscle line 41 that pile is arranged and gain in strength on the outer diaphragm of tubular bag 40.

More than these packaging bags, can be widely used in the packing of food, chemical industry, mineral products, far products, feed etc., the packaging bag made from traditional composite plastic diaphragm and traditional multiple film woven bag ratio, have the intensity height, non-leakage, anti-skidding, save material, film properties is good, convenient printing, packing can realize automation, applied range, recyclable utilization, is beneficial to the advantage of environmental protection.It is a kind of combined package bag of excellent performance.

Claims

1, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence, comprise the tubular bag, it is characterized in that base material that simple shape bag adopts be by one deck warp-wise unilateral stretching plastic film at least and the compound back of one deck broadwise unilateral stretching plastic film at least and one deck at least not the plastic film of the heat sealability excellence of stretch orientation be composited or by one deck warp-wise unilateral stretching plastic film at least and compound while of one deck broadwise unilateral stretching plastic film at least and one deck at least not the plastic film of the heat sealability excellence of stretch orientation be composited or by one deck warp-wise tensile strength at least be higher than the plastic film of broadwise tensile strength and one deck broadwise tensile strength at least be higher than the compound back of plastic film of warp-wise tensile strength and one deck at least not the plastic film of the heat sealability excellence of stretch orientation be composited or be higher than the plastic film of broadwise tensile strength and one deck broadwise tensile strength at least and be higher than the not bidirectional tensile plastic composite film sheet of the heat sealability excellence that is composited of the plastic film of the heat sealability excellence of stretch orientation of the compound while of plastic film of warp-wise tensile strength and one deck at least by one deck warp-wise tensile strength at least, between stretched plastic film adhesive layer is arranged.

2, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 is characterized in that it is to form plastic film is stretched that the warp-wise tensile strength is higher than plastic film that the plastic film of broadwise tensile strength, broadwise tensile strength be higher than the warp-wise tensile strength.

3, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 and 2 is characterized in that adhesive layer is arranged between plastic film.

4, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 and 2, it is characterized in that having at least in the compound film sheet one deck through warp direction stretching or the warp-wise tensile strength is higher than the plastic film of broadwise tensile strength or the plastic film that stretches through broadwise or the broadwise tensile strength is higher than the broadwise tensile strength is respectively to be extruded by extruder by multiple different material to make.

5, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 and 2 is characterized in that compound film sheet is no seam tubular diaphragm.

6, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 and 2 is characterized in that compound film sheet is a flat diaphragm, and the tubular bag is by behind the flat diaphragm overlap joint, forms with welding or bonding way.

7, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 and 2 is characterized in that having anti-skidding and concavo-convex muscle line that gain in strength on the outer diaphragm of the tubular bag that the bidirectional tensile plastic composite film sheet is made.

8, the Bidiretional tension-resistant packing bag of composite plastic film of heat sealability excellence according to claim 1 and 2 is characterized in that sealing in addition in the packaging bag or the bag end of discharge port, breakdown is arranged or irritate the sack of sack.