CN2439949Y

CN2439949Y - Two-way stretching-resisting plastic composit film piece with good heat-sealing performance

Info

Publication number: CN2439949Y
Application number: CN 00244470
Authority: CN
Inventors: 甘国工
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-19
Filing date: 2000-09-19
Publication date: 2001-07-25
Anticipated expiration: 2010-09-19

Abstract

The utility model provides a two-way stretching-resistance plastic composite film piece with good heat-sealing performance. The inner part of the composite film piece at least is provided with a plastic film piece which is stretched in one-way warp-wise way, at least a plastic film piece which is stretched in one-way weft-wise way, and at least a plastic film piece which is not be stretched and oriented and has good heat-sealing performance or at least a plastic film piece whose warp-wise stretching-resistance strength is higher than weft-wise stretching-resistance strength, at least a plastic film piece whose weft-wise stretching-resistance strength is higher than warp-wise stretching-resistance strength, and at least a plastic film piece which is stretched and oriented and has good heat-sealing performance. The utility model has the advantages of high two-way stretching-resistance strength and good heat-sealing performance. The utility model is convenient for sealing mouth and connecting operation.

Description

The bidirectional tensile plastic composite film sheet of heat sealability excellence

The utility model relates to a kind of composite plastic film sheet, particularly be a kind of bidirectional tensile plastic composite film sheet of heat sealability excellence.

Plastics and coextrusion composite membrane have been used quite general as the base material and the geo-membrane material of packaging material, for the waste that reduces resource with widen the range of application of plastic foil at packing and earthwork engineering, people have utilized tensile strength after the plastic foil hot-stretch orientation to increase the characteristics of this macromolecular material molecule stretching orientation of 5 to 15 times, utility model and the product that provides many stretched plastic films to make, polyethylene as simple tension, polypropylene packaging film, in order to as packing with tie up purposes, the polyethylene of simple tension, polypropylene, nylon, polyester silk or arrowband are as weaving, braiding, packaging bag, geotextiles and tie up usefulness.Particularly silk after the simple tension or arrowband through braiding back through, broadwise all has advantages of higher tensile strength, is a kind of packaging material of having many uses and geotextile material.

This technology that is used as packaging bag and geotextiles base material and the product of acquisition of after simple tension, having woven, with original plastic foil with the coextrusion composite membrane made packaging bag compare with geomembrane, bear identical load-carrying and identical stretching resistance, raw material can be saved more than 2 times.And use more reliable.Obviously engineering cost and packing cost can be lower than adopting plastic foil and coextrusion composite membrane.

Packaging bag and geomembrane majority need waterproof, antiseep and desired strength height, thus present more packing and engineering, still utilize through the silk of simple tension or braiding back, arrowband again film come waterproof, antiseep.Because the requirement of weaving and intensity, must be carried out to the process of silk or one-tenth fillet to plastics, the braiding process must be arranged, this braiding process is just as the weaving process process that weaves factory, 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 processing charges cost balance out the cost of raw and processed materials of saving than aforementioned plastic foil coextrusion composite membrane, people just begin one's study and the new structural composite base material of utility model to replace woven cloth be the packaging material and the geotechnological material of base material, particularly woven cloth is that the packaging material of base material often need to use behind the multiple film, adding the bad general bagging of heat sealability and connecing the width of cloth all is to sew to seal to connect the width of cloth, inconvenience is used after making waste recovery, become the environmental protection public hazards, unfavorable environmental protection.

Known have a biaxial tension diaphragm, the compound film sheet that biaxial tension diaphragm and unstretched plastics and plastic film are composited, the compound film sheet that simple tension diaphragm, simple tension diaphragm and unstretched plastics and plastic film are composited.Biaxial stretching film is extrudate flow Yangjing diaphragm or extrudes blowfilm shaping tubular diaphragm and divide macromolecule that other hot-stretch makes diaphragm through, latitude both direction generation molecular orientation effect and arrangement through institute's external force of executing to warp-wise, broadwise below the above viscous state temperature of glassy state temperature, thereby produce the stretching resistance of 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, the packaging field and the geotechnological field that can not be used for tear-proof or easily produce the stress mouth.

The simple tension diaphragm be into behind the diaphragm more than the glassy state temperature, below the viscous state temperature just/or warp-wise or broadwise simple tension diaphragm, the macromolecule that makes diaphragm/through or direction of latitude produce orientation and arrangement and produce advantages of higher tensile strength on the direction, the tensile strength of this draw direction is higher 5 to 15 times with the diaphragm of basal area than not stretching, but the tensile strength on the direction that does not stretch is more much lower with the diaphragm of basal area than not stretching, and more easily tear, and make this film tear resistance poor.

In order to prevent to adopt the simple tension diaphragm to make a direction that tensile strength be arranged, another direction does not have tensile strength fully and easily tears, people utilize plastics to make packing and geotextiles, have to the fillet of simple tension through, latitude two upwards braiding reach the two-way tensile strength and tear-resistant that all has, but braid is if want waterproof, antiseep, also must be through a compound skim, but can have aforesaid recycling and environmental issue.

Two kinds of composite plastic film sheets that this is main, easily tear weakness with the tear resistance difference in order to overcome the stress mouth, it is compound with it to have increased unstretched plastics and composite plastic film sheet, design is respectively more even to intensity by unstretching film, there is certain lear energy to remedy the defective of biaxial tension diaphragm and simple tension diaphragm, in the application of reality, also obtained some actual effects, but also do not reached requirement far away for demanding packing of load bearing requirements height, tensile strength and tear-proof and geotechnological application.

It is a kind of by warp, the compound bidirectional tensile plastic composite film sheet of latitude simple tension plastic film that the patent No. 97244530 provides.This compound film sheet is by warp, the compound bidirectional stretch compound film sheet of latitude simple tension 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 all has separately the simple tension film of direction bear respectively, because of the simple tension film itself has intensity the highest in the same film, therefore each to stretching resistance reached best fit, also be the maximum tensile strength.This two-layerly is combined as a whole with tack coat, if produce stress mouth or breach, because of the use of tack coat, breach tear by through, the two-layer quadrature of latitude promptly 90 ° of compound stretched film stop, and improved tear resistance greatly.This film can also according to service condition to the tensile strength through, latitude both direction require to increase one deck warp direction stretching film or broadwise stretched film and the compound more performance that gets.This film is used to pack, paulin, geomembrane have good performance and purposes.But, it is more very difficult that fusion between simple tension film and the biaxial stretching film connects, will make the film of contact be molten because want fusion to connect, and just to have destroyed the stretch orientation macromolecule and arranged orientation and intensity, and can reduce that this will seal, the tensile strength values of interface.So for the higher packaging bag of ask for something seal and automatic packaging line on seal or geomembrane connect the width of cloth, can only adopt bonding bonding, limited the range of application of this film.

In view of above reason, the purpose of this utility model is for a kind of bidirectional stretch intensity height is provided, and can do the bidirectional tensile plastic composite film sheet of materials such as packing, paulin, geomembrane, heat sealability excellence that the scope of application is wide.

The purpose of this utility model is achieved like this:

Have in the utility model compound film sheet one deck warp-wise simple tension plastic film at least and at least one deck broadwise simple tension plastic film and not the heat sealability excellence of stretch orientation plastic film or have at least one deck warp-wise tensile strength be higher than the plastic film of broadwise tensile strength and at least one deck broadwise tensile strength be higher than the plastic film of warp-wise tensile strength and one deck plastic film of the heat sealability excellence of stretch orientation not at least, come the plastic film of the heat sealability excellence of stretch orientation mainly to bear fusion connection or the anti-function that punctures, warp-wise tensile strength is higher than the plastic film of broadwise tensile strength, the plastic film that broadwise tensile strength is higher than warp-wise tensile strength is to form plastic film is stretched, have at least in the compound film sheet one deck through warp direction stretching or warp-wise tensile strength is higher than the plastic film of broadwise tensile strength or be respectively to be extruded by extruder by multiple different material to make through the plastic film that the broadwise tensile strength that broadwise stretches is higher than warp-wise tensile strength, can select different raw materials to improve the flexibility of diaphragm, tear resistance or heat sealability.

Between above-mentioned stretched plastic film adhesive layer is arranged.

Between above-mentioned plastic film adhesive layer is arranged.

Above-mentioned bidirectional tensile plastic composite film sheet has anti-skidding and concavo-convex muscle line that gain in strength on the one side at least.

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

Above-mentioned compound film sheet is a flat diaphragm.

The utility model compound film sheet after on, latitude both direction, all having brought into play plastics simple tension macromolecule and having aligned tensile strength than the stretched plastic diaphragm is not high 5 to 15 times, bidirectional stretch intensity height, the tearing toughness height, fusion, heat sealability excellence, the scope of application is wide, can be used as materials such as packaging bag, geomembrane, paulin, greatly reduce cost, more conveniently seal and be connected, baling line is easily realized automation, the recyclable utilization of product is the environmental protection type packing material.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:

Fig. 1 is the utility model embodiment 1 structural representation.

Fig. 2 is the utility model embodiment 2 structural representations

Fig. 3 is the I portion enlarged drawing of Fig. 2.

Fig. 4 is a broadwise stretched film structural representation among Fig. 2.

Fig. 5 is a warp direction stretching membrane structure schematic diagram among Fig. 2.

Fig. 6 is the utility model embodiment 3 structural representations.

Fig. 7 is the II portion enlarged drawing of Fig. 6.

Fig. 8 is the utility model embodiment 4 structural representations.

Fig. 9 is the utility model embodiment 5 structural representations.

Embodiment 1:

Fig. 1 has provided the utility model embodiment 1 figure.The present embodiment compound film sheet is a flat diaphragm.The low density polyethylene films lamella (LDPE) 1 that comprises the heat sealability excellence that do not stretch is (when compound flat diaphragm connects wide need piece together width of cloth expanding for the paulin geomembrane time or become tube, can fusion when becoming bag connect), be the broadwise simple tension plastic film 2 (also can be the plastic film that broadwise tensile strength is higher than warp-wise tensile strength) of one with low density polyethylene films lamella 1 by hot pressing compound (or it is compound to extrude curtain coating), unidirectional warp direction stretching plastic film 4 (also can be commandant's diaphragm that warp-wise tensile strength is higher than broadwise tensile strength) is positioned at plastic film 2,4 employing ethylene-vinyl acetate copolymer (EVA) is with plastic film 2,4 adhesive layers that bond together 3.

Embodiment 2:

Fig. 2～Fig. 5 has provided the utility model embodiment 2 figure.Present embodiment 2 compound film sheets are flat diaphragm.Comprise the not plastic film 5 of the heat sealability excellence of stretch orientation (can adopt the LDPE material also can adopt the LLDPE material) of one deck, one deck broadwise stretched plastic diaphragm 7, one deck warp direction stretching plastic film 9.The adhesive layer 6,8 that plastic film 7,9 is bonded as one is arranged respectively plastic film 5,75,7,9 of plastic films.On warp direction stretching plastic film 9 surfaces concavo-convex muscle line 10 is arranged.The concavo-convex discrepancy in elevation is 1/2～1/3 of warp direction stretching plastic film thickness.Broadwise stretched plastic diaphragm 7 is extruded by the multilayer extruder by high-density polyethylene material 11, linear polyethylene material 12 as shown in Figure 4 and is formed.Warp direction stretching plastic film 9 is extruded by the multilayer extruder by high-density polyethylene material 13 and linear polyethylene material 14 as shown in Figure 5 and is formed.

Embodiment 3:

Fig. 6, Fig. 7 have provided the utility model embodiment 3 figure.3 fundamental sum embodiment 2 are same for present embodiment, and not existing together is that compound film sheet is no seam tubular diaphragm.

Embodiment 4:

Fig. 8 has provided the utility model embodiment 4 figure.The compound film sheet of present embodiment 4 is a flat diaphragm.The low density polyethylene films lamella 15 that comprises the heat sealability excellence that do not stretch, compound by hot pressing with the low density polyethylene films lamella is the broadwise stretched plastic 16 of one, broadwise stretched plastic diaphragm 18, warp direction stretching plastic film 20, lay respectively at 16,18,20 of membrane layers 15, plastic film and with it adhesive layer that is connected as a single entity 17,19.

Embodiment 5:

Fig. 9 has provided the utility model embodiment 5 figure.Present embodiment 5 fundamental sum embodiment 1 together.Do not exist together is by the do not stretch low density polyethylene films sheet 22 of heat sealability excellence of the compound one deck of hot pressing on warp direction stretching plastic film 21.Two layers of unidirectional stretched plastic diaphragm one broadwise stretched plastic diaphragm 23, warp direction stretching plastic film 21 are mainly born fusion and are connected and the anti-function that punctures, and adopt the LLDPE plastics to make.Sequence number 24,25 is respectively the low density polyethylene films lamella of the heat sealability excellence that do not stretch, adhesive layer.

Claims

1, the bidirectional tensile plastic composite film sheet of heat sealability excellence, it is characterized in that having in the compound film sheet one deck warp-wise simple tension plastic film at least and at least one deck broadwise simple tension plastic film and at least one deck not the heat sealability excellence of stretch orientation plastic film or have at least one deck warp-wise tensile strength be higher than the plastic film of broadwise tensile strength and at least one deck broadwise tensile strength be higher than the plastic film of warp-wise tensile strength and one deck plastic film of the heat sealability excellence of stretch orientation not at least.

2, the bidirectional tensile plastic composite film sheet of heat sealability excellence according to claim 1 is characterized in that between stretched plastic film adhesive layer being arranged.

3, the bidirectional tensile plastic composite film sheet of heat sealability excellence according to claim 1 is characterized in that adhesive layer is arranged between plastic film.

4, according to the bidirectional tensile plastic composite film sheet of claim 1 or 2 or 3 described heat sealability excellences, it is characterized in that the bidirectional tensile plastic composite film sheet has anti-skidding and concavo-convex muscle line that gain in strength on the one side at least.

5, according to the bidirectional tensile plastic composite film sheet of claim 1 or 2 or 3 described heat sealability excellences, it is characterized in that compound film sheet is no seam tubular diaphragm.

6, the bidirectional tensile plastic composite film sheet of heat sealability excellence according to claim 4 is characterized in that compound film sheet is no seam tubular diaphragm.

7, according to the bidirectional tensile plastic composite film sheet of claim 1 or 2 or 3 described heat sealability excellences, it is characterized in that compound film sheet is a flat diaphragm.

8, the bidirectional tensile plastic composite film sheet of heat sealability excellence according to claim 4 is characterized in that compound film sheet is a flat diaphragm.