CN206395159U - A kind of self-support plastic packaging bag for being used to pack liquid detergent - Google Patents

Abstract

The utility model is related to a kind of self-support plastic packaging bag for being used to pack liquid detergent, including plastic packaging bag body, plastic packaging bag body includes preceding plastic sheet, rear plastic sheet, the lower plastic sheet being bonded, accommodating chamber is provided with plastic packaging bag body, plastic packaging bag body is provided with conduction part, conduction part outer end is additionally provided with hand and tears portion, hand, which is torn, is respectively equipped with recess and easy-torn line between portion and conduction part, conduction part is affiliated to groove provided with arc, conduction part is provided with the drainage channel for being through to accommodating chamber, and preceding plastic sheet is provided with the first bulge-structure；Plastic sheet is provided with the second bulge-structure afterwards, and the first bulge-structure and the second bulge-structure can form sealing function to the end of drainage channel jointly.The utility model has the advantages that simple in construction, design science is reasonable, easy to use, is manufactured into body, in upright placement after opening packaging, sealing function can be automatically formed, it is to avoid liquid detergent occurs rotten, avoid smelling out, it is ensured that the air quality of living environment.

Description

A kind of self-support plastic packaging bag for being used to pack liquid detergent

Technical field

The utility model is related to package of liquid products field, particularly a kind of self-support plastics package for being used to pack liquid detergent Bag.

Background technology

At present, in order to reduce the production and transportation cost of liquid detergent, increasing fluid product changes to be carried out by polybag Packaging.But plastics package Shortcomings always on the convenience used, many worries are brought to consumption.For example：To When liquid detergent is filled in Packaging Bottle, because plastic bag is usually that software plastics are made, and its size being open can be with human hand The size of active force and changed with the reduction of fluid product in polybag, in pouring process even if extreme care also when Side leakage occurs or unrestrained situation in length, and no small frustration is brought to consumer.Although occurring in that at present by plastics bag The structure of mozzle is set in pack, to guide liquid detergent to enter in the Packaging Bottle specified by mozzle.But transporting Cheng Zhong, mozzle can be squeezed deformation, not reach water conservancy diversion effect.In the case of excessive compression, or even mozzle occurs The situation of packaging bag is punctured, and the manufacturing cost of such plastic packaging bag is higher.Meanwhile, existing self-support plastic packaging bag is in sealing Place is not provided with any complementary structure, after sealing is cut off, and the liquid detergent in plastic packaging bag will directly be contacted with air, long Under the use of time, the quality for being easily caused liquid detergent changes, and influences the cleaning performance of clothing.Moreover, liquid detergent it is easy from The sealing part cut off flies away out, influences the air quality on periphery, and people may be to healthy after excessive smell is sucked Impact.Especially in the presence of the patient of breathing problem, the respiratory tract of people can be stimulated after suction, may result in patient's Aggravation.

Utility model content

The purpose of this utility model is to solve the above problems and deficiency is moulded there is provided a kind of self-support for being used to pack liquid detergent Expect packaging bag, the self-support plastic packaging bag has the advantages that simple in construction, design science is reasonable, easy to use, is manufactured into body, And during the storage after opening packaging, can both be avoided that liquid detergent occurs rotten, also automatically to sack formation sealing function It is avoided that smelling out, it is ensured that the air quality of living environment.

What the technical solution of the utility model was realized in：

A kind of to be used to pack the self-support plastic packaging bag of liquid detergent, its feature is to include plastic packaging bag body, wherein Plastic packaging bag body includes preceding plastic sheet, rear plastic sheet, lower plastic sheet, the structure phase of the preceding plastic sheet and rear plastic sheet Together, the preceding plastic sheet upper end is bonded together with rear plastic sheet upper end by heat pressing process, the preceding plastic sheet left and right sides Accordingly bonded together to the rear plastic sheet left and right sides by the way that heat pressing process is corresponding, the preceding plastic sheet bottom and rear plastic sheet Bottom is enclosed jointly is formed with lower port, and the lower plastic sheet surrounded surface is bonded in the four of lower port by heat pressing process respectively On all inwalls, the preceding plastic sheet, rear plastic sheet enclose and are formed with closed accommodating chamber jointly with lower plastic sheet；The plastics bag The pack body upper left corner is provided with the conduction part extended laterally, and the conduction part is by pasting the first plastic sheet together, second Plastic sheet is constituted, and first plastic sheet is identical with the structure of the second plastic sheet, and the conduction part outer end is additionally provided with hand and tears portion, institute State hand and tear portion and be made up of the first film, the second film pasted together, first film is identical with the structure of the second film, institute State the first plastic sheet, the first film, preceding plastic sheet and be integrated the slice plastic structure processed, second plastic sheet, Two films, rear plastic sheet are integrated the slice plastic structure processed, and the hand tears the outward flange that portion is in contact with conduction part On offer and offer arc on recess in tip-angled shape, conduction part side wall and be affiliated to groove；The hand tears portion and conduction part Junction provided with laser cutting easy-torn line；Upper extrusion forming goes out to have first in the middle part of the first plastic sheet medial surface Connected in star, the first strip groove outer end is extended on the first film medial surface, and described first strip groove the inner is extended to On preceding plastic sheet medial surface；Upper extrusion forming goes out to have the second strip groove in the middle part of the second plastic sheet medial surface, and described second Strip groove outer end is extended on the second film medial surface, and described second strip groove the inner extends to rear plastic sheet medial surface On；Position position with second strip groove on rear plastic sheet of first strip groove on preceding plastic sheet is corresponding, And first strip groove and the second strip groove enclose to form Packed drainage channel jointly, the drainage channel and accommodating chamber phase Insertion；Extrusion forming goes out to have the first bar shaped convex portion, the first bar shaped convex portion two ends difference in the preceding plastic sheet inner left wall Before extending on the left of plastic sheet on abutting edge and the first strip groove the inner, extrusion forming goes out on the preceding plastic sheet upper end inwall There is the second bar shaped convex portion, the second bar shaped convex portion two ends extend respectively to preceding plastic sheet upper end abutting edge and the first strip groove On the inner, extrusion forming is gone back on the preceding plastic sheet medial surface and goes out to have Article 3 shape convex portion, Article 3 shape convex portion is from the first bar shaped Groove ends extend plastic sheet inner side forward, the first bar shaped convex portion, the common structure in the second bar shaped convex portion and Article 3 shape convex portion Into the first bulge-structure for being in alphabetical Y-shaped；Extrusion forming goes out to have Article 4 shape convex portion in the rear plastic sheet inner left wall, The Article 4 shape convex portion two ends extend respectively on the left of rear plastic sheet abutting edge with the second strip groove the inner, it is described after Extrusion forming goes out to have Article 5 shape convex portion on the inwall of plastic sheet upper end, and the Article 5 shape convex portion two ends extend respectively to rear plastics On piece upper end abutting edge and the second strip groove the inner, extrusion forming goes out to have Article 6 shape convex on the rear plastic sheet medial surface Portion, Article 6 shape convex portion extends on the inside of the second strip groove end backward plastic sheet, the Article 4 shape convex portion, Article 5 shape Convex portion has also collectively formed the second bulge-structure in alphabetical Y-shaped with Article 6 shape convex portion；First bulge-structure is preceding Position of the position with the second bulge-structure on rear plastic sheet on plastic sheet overlaps.

The beneficial effects of the utility model：The utility model includes plastic packaging bag body, on plastic packaging bag body Provided with conduction part, in conduction part being additionally provided with hand tears portion, and also extrusion forming goes out to have drainage to lead to respectively in conduction part and hand tear portion Road, the outer end of drainage channel is torn in portion positioned at hand, and the inner of drainage channel is connected with accommodating chamber.Its structure very simple and section Learn reasonable, the raw material of packaging bag need to be only used to three plastic papers, and then extrusion forming goes out needs on corresponding plastic paper Structure, bonded together finally by heat pressing process, its manufacture cost it is very low.Wherein, drainage channel is to pass through What extrusion forming came out, and be made of one piece with plastic packaging bag body.It is squeezed and occurs in transportation Deformation, also can voluntarily return to original state when in use, during liquid detergent is toppled over, and the size of drainage channel will not occur to appoint What changes；To keep the stability for toppling over middle fluid flow, it is to avoid the unrestrained situation of side leakage occur.And depositing after packaging is cut off During putting, because liquid detergent is affected by gravity, the bottom of plastic packaging bag can be in automatically, so that dirty open preceding plastic sheet Bottom and rear plastic sheet bottom, stick together the top and the top of rear plastic sheet of preceding plastic sheet, so that first Bulge-structure is sticked together with the second bulge-structure, is formed sealing function to the inner of drainage channel to automatically form, can be prevented Only air is come in contact by drainage channel with liquid detergent, to ensure the quality of liquid detergent, is extended the storage of liquid detergent and is used Time.Said structure is also avoided that the smelling out of liquid detergent, flies away in air, so that from avoiding causing shadow to surrounding enviroment Ring, and then ensure that people are healthy.Meanwhile, preserved needing the liquid detergent in plastic packaging bag being filled in bottle When, it arc is affiliated to the bottle mouth position that groove is hung on bottle, then the proposition of slow lifting plastic packaging bag, you can will do washing Liquid is filled in bottle, will not occur any side leakage, meanwhile, filling difficulty is also reduced, using very convenient simple, favorably In the filling efficiency of raising.Recess and easy-torn line that portion junction is provided with tip-angled shape are torn in conduction part and hand, bag is being taken apart During dress, people only need a hand to hold the side of plastic packaging bag, and the finger of another hand is pinched to be torn in portion in hand, Ran Houyong Power pulls hand to tear portion, and exerts a force on recess, you can crack is torn out at recess and is come out, then passes through easy-torn line It is oriented to, hand is torn portion and be separated from the position at setting, it is to avoid the excessive or too small situation of opening occurs. The operation is cut without knife and can just completed, easy to operate.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the structural representation of preceding plastic sheet use state in the utility model.

Fig. 3 is the structural representation of rear plastic sheet use state in the utility model.

Fig. 4 is the structural representation of lower plastic sheet use state in the utility model.

Fig. 5 is the utility model use state with reference to figure.

Embodiment

As shown in figure 1, a kind of self-support plastic packaging bag for being used to pack liquid detergent described in the utility model, including plastics Packaging bag body 1, wherein, as shown in Figures 1 to 4, the plastic packaging bag body 1 include preceding plastic sheet 11, rear plastic sheet 12, Lower plastic sheet 13, the preceding plastic sheet 11 is identical with the structure of rear plastic sheet 12, the preceding upper end of plastic sheet 11 and rear plastic sheet 12 upper ends are bonded together by heat pressing process, and the preceding left and right sides of plastic sheet 11 passes through heat with the rear left and right sides of plastic sheet 12 Pressure technique accordingly accordingly bonds together, and the preceding bottom of plastic sheet 11 encloses and is formed with down jointly with the rear bottom of plastic sheet 12 Port, the lower surrounded surface of plastic sheet 13 is bonded on the surrounding inwall of lower port respectively by heat pressing process, the preceding modeling Tablet 11, rear plastic sheet 12 enclose and are formed with closed accommodating chamber 10 jointly with lower plastic sheet 13.As shown in figure 1, the plastics The upper left corner of packaging bag body 1 is provided with the conduction part 2 extended laterally, and the conduction part 2 is by pasting the first plastic sheet together 21st, the second plastic sheet 22 is constituted, and first plastics 21 are identical with the structure of the second plastic sheet 22, and the outer end of conduction part 2 is also Tear portion 3 provided with hand, the hand tears portion 3 and is made up of the first film 31, the second film 32 pasted together, first film 31 with The structure of second film 32 is identical, and first plastic sheet 21, the first film 31, preceding plastic sheet 11 are integrated the piece processed Shape plastic construction, second plastic sheet 22, the second film 32, rear plastic sheet 12 are integrated the slice plastic knot processed Structure, the hand tears the recess 4 offered on the outward flange that portion 3 is in contact with conduction part 2 in tip-angled shape, the side of conduction part 2 Arc is offered on wall and is affiliated to groove 5；The hand tears portion 3 and easy-torn line 6 of the junction provided with laser cutting of conduction part 2. As shown in Figure 1 to Figure 3, upper extrusion forming goes out to have the first strip groove 211 in the middle part of the medial surface of the first plastic sheet 21, and described the The outer end of one strip groove 211 is extended on the medial surface of the first film 31, and described the inner of first strip groove 211 extends to preceding plastics On the medial surface of piece 11；Upper extrusion forming goes out to have the second strip groove 221, described second in the middle part of the medial surface of second plastic sheet 22 The outer end of strip groove 221 is extended on the medial surface of the second film 32, and described the inner of second strip groove 221 extends to rear plastic sheet On 12 medial surfaces；Position of first strip groove 211 on preceding plastic sheet 11 is with the second strip groove 221 in rear plastic sheet Position on 12 is corresponding, and the first strip groove 211 and the second strip groove 221 enclose jointly to be formed Packed drainage lead to Road 20, the drainage channel 20 connects with accommodating chamber 10.As shown in Fig. 2 extrusion forming in the inner left wall of preceding plastic sheet 11 Go out to have the first bar shaped convex portion 111, the left side abutting edge of plastic sheet 11 and the before the two ends of the first bar shaped convex portion 111 are extended respectively to On the inner of one strip groove 211, extrusion forming goes out to have the second bar shaped convex portion 112 on the preceding upper end inwall of plastic sheet 11, described It is described before the two ends of second bar shaped convex portion 112 are extended respectively on the upper end abutting edge of plastic sheet 11 and the inner of the first strip groove 211 Extrusion forming is gone back on the preceding medial surface of plastic sheet 11 and goes out to have Article 3 shape convex portion 113, Article 3 shape convex portion 113 is from the first strip groove 211 ends extend the inner side of plastic sheet 11 forward, the first bar shaped convex portion 111, the second bar shaped convex portion 112 and Article 3 shape convex portion 113 together constitute the first bulge-structure 30 in alphabetical Y-shaped.As shown in figure 3, being squeezed in the inner left wall of rear plastic sheet 12 Molded to go out to have Article 4 shape convex portion 121, it is viscous that the two ends of Article 4 shape convex portion 121 extend respectively to the rear left side of plastic sheet 12 Meet place and on the inner of the second strip groove 221, extrusion forming goes out to have Article 5 shape convex portion on the rear upper end inwall of plastic sheet 12 122, the two ends of Article 5 shape convex portion 122 are extended respectively in the rear upper end abutting edge of plastic sheet 12 and the second strip groove 221 On end, extrusion forming goes out to have Article 6 shape convex portion 123, Article 6 shape convex portion 123 from second on the rear medial surface of plastic sheet 12 The end of strip groove 221 extends the inner side of plastic sheet 12 backward, the Article 4 shape convex portion 121, Article 5 shape convex portion 122 and the 6th Bar shaped convex portion 123 has also collectively formed the second bulge-structure 40 in alphabetical Y-shaped.First bulge-structure 30 is in preceding plastics Position of the position with the second bulge-structure 40 on rear plastic sheet 12 on piece 11 overlaps.The utility model includes plastics package Bag body 1, conduction part 2 is provided with plastic packaging bag body 1, hand is additionally provided with conduction part 2 and tears portion 3, in conduction part 2 and hand Tear in portion 3 that also extrusion forming goes out to have drainage channel 20 respectively, the outer end of drainage channel 20 is torn in portion 3 positioned at hand, drainage channel 20 The inner be connected with accommodating chamber 10.Its structure very simple and scientific and reasonable, the raw material of packaging bag need to be only used to three Plastic paper, then extrusion forming goes out the structure of needs on corresponding plastic paper, is bonded together i.e. finally by heat pressing process Can, the cost that it is manufactured is very low.Wherein, drainage channel 20 is come out by extrusion forming, and with plastic packaging bag body 1 It is made of one piece.It is squeezed and deforms in transportation, original state also can be voluntarily returned to when in use, During toppling over liquid detergent, any change will not occur for the size of drainage channel 20；To keep toppling over the steady of middle fluid flow It is qualitative, it is to avoid the unrestrained situation of side leakage occur.And during the storage after cutting off packaging, because liquid detergent is made by gravity With, the bottom of plastic packaging bag can be in automatically, so that the dirty bottom for opening preceding plastic sheet 11 and the bottom of rear plastic sheet 12, before making The top of plastic sheet 11 and the top of rear plastic sheet 12 are sticked together, so that the first bulge-structure 30 and the second bulge-structure 40 stick together, and form sealing function to the inner of drainage channel 20 to automatically form, can prevent air from passing through drainage channel 20 come in contact with liquid detergent, to ensure the quality of liquid detergent, extend storage and the use time of liquid detergent.Said structure can also The smelling out of liquid detergent is avoided, is flown away in air, so that from avoiding impacting surrounding enviroment, and then ensure people's body Body health.Meanwhile, as shown in figure 5, need the liquid detergent in plastic packaging bag being filled to preserved in bottle when, can be first Arc is set to be affiliated to the bottle mouth position that groove 5 is hung on bottle, then the proposition of slow lifting plastic packaging bag, you can liquid detergent is filling Into bottle, will not occur any side leakage, meanwhile, filling difficulty is also reduced, using very convenient simple, is conducive to improving Filling efficiency.Recess 4 and easy-torn line 6 that the junction of portion 3 is provided with tip-angled shape are torn in conduction part 2 and hand, packaging is being taken apart During, people only need a hand to hold the side of plastic packaging bag, and the finger of another hand is pinched to be torn in portion 3 in hand, Ran Houyong Power pulls hand to tear portion 3, and exerts a force on recess 4, you can tears out crack at recess 4 and comes out, then by easy Tearing line 6 is oriented to, and hand is torn portion 3 and be separated on the position at setting, it is to avoid opening occur excessive or too small Situation.The operation is cut without knife and can just completed, easy to operate.The utility model includes plastic packaging bag body 1, Conduction part 2 is provided with plastic packaging bag body 1, hand is additionally provided with conduction part 2 and tears portion 3, in conduction part 2 and hand tear portion 3 Also extrusion forming goes out to have drainage channel 20 respectively, and the outer end of drainage channel 20 is torn in portion 3 positioned at hand, drainage channel 20 the inner with Accommodating chamber 10 is connected.Its structure very simple and scientific and reasonable, the raw material of packaging bag need to be only used to three plastic papers, so Extrusion forming goes out the structure of needs on corresponding plastic paper afterwards, is bonded together finally by heat pressing process, and it is manufactured Cost it is very low.Wherein, drainage channel 20 is come out by extrusion forming, and is integrally formed with plastic packaging bag body 1 Form.It is squeezed and deforms in transportation, original state also can be voluntarily returned to when in use, is toppling over laundry During liquid, any change will not occur for the size of drainage channel 20；To keep the stability for toppling over middle fluid flow, it is to avoid There is the unrestrained situation of side leakage.And during the storage after cutting off packaging, can be automatic because liquid detergent is affected by gravity Bottom in plastic packaging bag, so that the dirty bottom for opening preceding plastic sheet 11 and the bottom of rear plastic sheet 12, plastic sheet 11 before making Top and the top of rear plastic sheet 12 stick together so that the first bulge-structure 30 is abutted in the second bulge-structure 40 Together, sealing function is formed to the inner of drainage channel 20 to automatically form, can prevents air from passing through drainage channel 20 and laundry Liquid comes in contact, to ensure the quality of liquid detergent, extends storage and the use time of liquid detergent.Said structure is also avoided that laundry The smelling out of liquid, flies away in air, so that from avoiding impacting surrounding enviroment, and then ensure that people are healthy. Meanwhile, need the liquid detergent in plastic packaging bag being filled to preserved in bottle when, arc is affiliated to groove 5 and hang In the proposition of the bottle mouth position of bottle, then slow lifting plastic packaging bag, you can liquid detergent is filled in bottle, will not be occurred Any side leakage, meanwhile, filling difficulty is also reduced, using very convenient simple, is conducive to improving filling efficiency.In drainage Recess 4 and easy-torn line 6 that the junction of portion 3 is provided with tip-angled shape tear with hand in portion 2, and in packaging process is taken apart, people only need one Hand holds the side of plastic packaging bag, and the finger of another hand is pinched to be torn in portion 3 in hand, then pulls at the portion of tearing 3 of starting, and will Power is applied on recess 4, you can is torn out crack at recess 4 and is come out, and is then oriented to by easy-torn line 6, can be smooth Make hand tear portion 3 to separate on the position at setting, it is to avoid there is the excessive or too small situation of opening.The operation need not be borrowed Helping knife to cut can just complete, easy to operate.

Wherein, the dash area that Fig. 2 is made up of into Fig. 4 the choice refreshments arranged at random together be preceding plastic sheet 11, after Corresponding bonding location on plastic sheet 12, lower plastic sheet 13.It is in dotted lines of the Fig. 1 into Fig. 3 guided by label 6 at position Easy-torn line 6, a plurality of parallel easy-torn line 6 can be set simultaneously in packaging bag, it is to avoid occur tearing inclined during opening the package Situation occurs.

Claims (1)

1. a kind of self-support plastic packaging bag for being used to pack liquid detergent, it is characterised in that：Including plastic packaging bag body（1）, its Middle plastic packaging bag body（1）Including preceding plastic sheet（11）, rear plastic sheet（12）, lower plastic sheet（13）, the preceding plastic sheet （11）With rear plastic sheet（12）Structure it is identical, the preceding plastic sheet（11）Upper end and rear plastic sheet（12）Upper end passes through hot pressing work Skill bonds together, the preceding plastic sheet（11）The left and right sides and rear plastic sheet（12）Mutually tackled by heat pressing process the left and right sides Bond together with answering, the preceding plastic sheet（11）Bottom and rear plastic sheet（12）Bottom is enclosed jointly is formed with lower port, institute State lower plastic sheet（13）Surrounded surface is bonded on the surrounding inwall of lower port respectively by heat pressing process, the preceding plastic sheet （11）, rear plastic sheet（12）With lower plastic sheet（13）Enclose jointly and be formed with closed accommodating chamber（10）；The plastic packaging bag Body（1）The upper left corner is provided with the conduction part extended laterally（2）, the conduction part（2）By pasting the first plastic sheet together （21）, the second plastic sheet（22）Constitute, first plastic sheet（21）With the second plastic sheet（22）Structure it is identical, the drainage Portion（2）Outer end is additionally provided with hand and tears portion（3）, the hand tears portion（3）By pasting the first film together（31）, the second film（32）Structure Into first film（31）With the second film（32）Structure it is identical, first plastic sheet（21）, the first film（31）、 Preceding plastic sheet（11）It is integrated the slice plastic structure processed, second plastic sheet（22）, the second film（32）, rear modeling Tablet（12）The slice plastic structure processed is integrated, the hand tears portion（3）With conduction part（2）On the outward flange being in contact Offer the recess in tip-angled shape（4）, the conduction part（2）Arc, which is offered, on the wall of side is affiliated to groove（5）；The hand tears portion （3）With conduction part（2）Junction provided with laser cutting easy-torn line（6）；First plastic sheet（21）In medial surface Extrusion forming, which goes out, in portion the first strip groove（211）, first strip groove（211）Outer end extends to the first film（31） On medial surface, first strip groove（211）The inner extends to preceding plastic sheet（11）On medial surface；Second plastic sheet （22）Upper extrusion forming goes out to have the second strip groove in the middle part of medial surface（221）, second strip groove（221）Outer end is extended to Second film（32）On medial surface, second strip groove（221）The inner extends to rear plastic sheet（12）On medial surface；It is described First strip groove（211）In preceding plastic sheet（11）On position and the second strip groove（221）In rear plastic sheet（12）On Position is corresponding, and the first strip groove（211）With the second strip groove（221）Enclose to form Packed drainage channel jointly （20）, the drainage channel（20）With accommodating chamber（10）Connect；The preceding plastic sheet（11）Extrusion forming goes out to have in inner left wall First bar shaped convex portion（111）, the first bar shaped convex portion（111）Two ends extend respectively to preceding plastic sheet（11）Left side abutting edge with First strip groove（211）On the inner, the preceding plastic sheet（11）Extrusion forming goes out to have the second bar shaped convex portion on the inwall of upper end （112）, the second bar shaped convex portion（112）Two ends extend respectively to preceding plastic sheet（11）Upper end abutting edge and the first strip groove （211）On the inner, the preceding plastic sheet（11）Extrusion forming is gone back on medial surface and goes out to have Article 3 shape convex portion（113）, Article 3 shape Convex portion（113）From the first strip groove（211）End plastic sheet forward（11）Inner side extends, the first bar shaped convex portion（111）、 Second bar shaped convex portion（112）With Article 3 shape convex portion（113）Together constitute the first bulge-structure in alphabetical Y-shaped（30）； The rear plastic sheet（12）Extrusion forming goes out to have Article 4 shape convex portion in inner left wall（121）, the Article 4 shape convex portion（121） Two ends extend respectively to rear plastic sheet（12）Left side abutting edge and the second strip groove（221）On the inner, the rear plastic sheet （12）Extrusion forming goes out to have Article 5 shape convex portion on the inwall of upper end（122）, the Article 5 shape convex portion（122）Two ends are each extended over To rear plastic sheet（12）Upper end abutting edge and the second strip groove（221）On the inner, the rear plastic sheet（12）Squeezed on medial surface It is molded to go out to have Article 6 shape convex portion（123）, Article 6 shape convex portion（123）From the second strip groove（221）End plastics backward Piece（12）Inner side extends, the Article 4 shape convex portion（121）, Article 5 shape convex portion（122）With Article 6 shape convex portion（123）Also altogether With the second bulge-structure constituted in alphabetical Y-shaped（40）；First bulge-structure（30）In preceding plastic sheet（11）On Position and the second bulge-structure（40）In rear plastic sheet（12）On position overlap.