CN101553414B

CN101553414B - Recloseable bag

Info

Publication number: CN101553414B
Application number: CN2007800450961A
Authority: CN
Inventors: N·J·罗杰斯
Original assignee: Procter and Gamble Ltd
Current assignee: Procter and Gamble Ltd; Procter and Gamble Co
Priority date: 2006-12-05
Filing date: 2007-11-30
Publication date: 2012-04-04
Anticipated expiration: 2027-11-30
Also published as: MX2009006051A; RU2404101C1; BRPI0719919A2; US20080131035A1; ATE477196T1; DE602007008344D1; ES2350266T3; AR064159A1; WO2008068696A1; ZA200903774B; CN101553414A

Abstract

The invention relates to bag ( 10 ) comprising a line of weakness ( 28 ) for ease of opening, and a reclosing means ( 32 ), wherein the bag ( 10 ) comprises a front panel ( 12 ), back panel ( 14 ) andopposing side panels ( 16, 18 ), the panels being sealed together to provide a top section ( 24 ) and a bottom section ( 26 ), and wherein the line of weakness ( 28 ) extends around all of the front ( 12 ), back ( 14 ) and side ( 16, 18 ) panels so that the top section ( 24 ) is completely removable from the rest of the bag, and wherein the reclosing means ( 32 ) is attached to the front ( 12 ), back ( 14 ) and side ( 16, 18 ) panels adjacent to the line of weakness ( 28 ). The invention also relates to process for forming bags ( 10 ) from a web of film ( 30 ).

Description

The bag of Reclosable

Technical field

The present invention relates to be used to store such as but be not limited to the bag of products such as powder or detergent granules, pet food, coffee, cereal, wherein said bag has makes weak line that bag opens easily and packaged unit again.

Background technology

Flexible pouch is used for packing the various consumables that comprise detergent granules today.In order to be used as packing, these bags must be difficult for opening during transportation and stores processor.The detergent bags of listing has several shortcomings at present.The first, present bag is not difficult to open by scissors, knife or other utensil.The customer usually attempts to tear said bag, and net result is to make content spill.In addition, bag can pullling and stretch and become distortion because of opening action with any literal that is printed on the bag.

The second, in case after opening, present detergent bags does not provide effective parts to come closing bag again.Again the ability of closing bag is that a lot of customers are desired.This packing for big model is all the more so.Up to now, it is still unsatisfactory to be used for sealing again the method for this type of bag.These methods comprise zip and adhesive tape and simple fold mechanism.The major defect of preceding method is that the content of bag pollutes packaged unit again, thus the sealing that can't make parts form failure-free, can reuse.In addition, simple fold mechanism does not provide the protection for product leakage.

Therefore, still there is demand for the flexible pouch of opening (that is, not by knife, scissors or other utensil) easily that is used for consumer products packaged.Still exist for can be after bag is opened by the extra needs of customer in order to the mechanism that seals said bag securely again.Again closing means preferably should not receive the influence of any pollution.

Summary of the invention

The present invention through provide comprise the weak line that is easy to open and again the bag of packaged unit satisfied aforementioned needs; Wherein said bag comprises anter, back sheet and relative lateral plate; Said each sheet is sealed to together so that top and bottom to be provided; And wherein said weak line extends around all anters, back sheet and lateral plate, so that can the remainder of top from bag be removed fully, and the contiguous weak line of wherein said packaged unit again is attached to anter, back sheet and lateral plate.

The present invention also provides a kind of and processes the method for bag by the film net, and wherein said film net transmits along one or more machine in the vertical, and the vertical direction in thin film planar be horizontal, said method comprising the steps of:

(a) the weak line of the whole width that crosses film basically roughly is provided in the horizontal;

(b) the contiguous weak attached packaged unit again of line;

(c) cut and seal said film with formation comprise weak line and packaged unit again bag.

Wherein the step (a) and (b) with (c) on same or independent machine, carry out step (a) and (b) accomplish before preferably in step (c) with any order; And along net with fixed interval repeating step (a) and (b) with (c) to form a plurality of bag.

Description of drawings

Fig. 1 and 2 is the transparent view of bag of the present invention.

Fig. 3 is the transparent view of bag of the present invention after removing the top fully.

Fig. 4 is the diagrammatic view of the part of film net, illustrates method embodiment of the present invention.

Fig. 5 is the diagrammatic view of the part of film net, illustrates alternative approach embodiment of the present invention.

The specific embodiment

Now will be in detail referring to the preferred embodiments of the invention, the example has been shown in the accompanying drawing.Should be appreciated that term " preceding " and " back " that this paper is used for describing the sheet of bag only are used for representing to be orientated and in other words be interchangeable.As back literary composition more discusses fully, the present invention relates to a kind of flexible pouch that is used to comprise graininess, Powdered or other content (being preferably detergent granules), it has weak line and opens with help.Fig. 1 and 2 shows a kind of especially preferred bag 10 manufactured according to the present invention.It shows that bag 10 has anter 12, back sheet 14 and

lateral plate

16 and 18, and wherein each sheet all has upper limb 20 and lower edge 22.Bag 10 also has top 24 and bottom 26, and they all seal through anter 12 being joined on the sheet 14 of back with lower edge 22 along upper limb 20.All has weak line 28 on bag 10 each in anter, back sheet and

lateral plate

12,14,16,18.Fig. 3 shows the bag after top 24 being removed fully, and has shown again packaged unit 32.

Bag material

Bag of the present invention is processed by following material; Said material includes but not limited to polymer film, woven material, non-woven material; Be preferably polyethylene film; More preferably be monolayer material, coextrusion material, two laminate, three layer laminate and metallised laminate, all material has or does not have lacquer coat.Process like the available any means known in the art of bag of the present invention.The method that a kind of continuous net with material forms flexible pouch is well-known in the art and is described in the US Pat 5,054,619 of authorizing Muckenfuhs.According to following the preferred embodiments of the invention in greater detail; The continuous net 30 of the material shown in Fig. 4 transmits and roughly on laterally (CMD), has the weak line 28 of the whole width that roughly crosses net 30 on vertically (MD), and packaged unit 32 is roughly gone up contiguous weak line 28 at laterally (CMD) and carried out attached again.Again packaged unit 32 shown in Figure 4 comprises a ring bar 34 and two hook bars 36.

Weak line

According to opening easily of bag of the present invention be characterised in that desired bag break or separated track on the weakened film material.

Weak line extends through each in the forward and backward and lateral plate of bag.This make the bag entire top can be separated when opening.

Weak line will weaken film strength, make it can withstand normal filling, packing and processing operation, but opened by the customer easily.This character realizes through the trapezoidal tear strength that weakens initial film.Weaken the loss that trapezoidal tear strength also very likely is attended by tensile strength.

Weak line characterizes through following test method: the ASTM D-5733 standard method of test of a) the ASTM D-882 standard method of test of test tensile properties on thin plastic sheet, and b) testing the supatex fabric tear strength with trapezoidal method.According to ASTM D-882 and ASTM D-5733, weak line must be parallel to the minor face (that is width) of sample.Weak line must cover sample whole width and must be placed in the middle with respect to sample length.The line of rabbet joint that is used for the otch of initial trapezoidal tear sample must be at the top of weak line.

Use three parameters that obtain from above-mentioned standard testing to characterize weak line.First parameter is a yield value of stress.Preferably, in ASTM D-882 tensile test, the yield value of stress of weakened film should be not less than weakened film not yield value of stress 90%.The second, the final or rupture stress value of weakened film preferably should be not less than the not yield value of stress Y of weakened film ₁90%.

The 3rd, the average trapezoidal power of tearing according to ASTM D-5733 of weakened film preferably should be less than 4Kgf.

In addition, weak line can have pattern.Those patterns can be the form of continuous lines, dotted line or their combination.Yet most preferred pattern is a dotted line, and wherein dotted line is made up of a plurality of marking-off segments.The length of each marking-off segment is about 0.12mm to 4.4mm, preferably is about 0.3mm to 2mm, is more preferably 0.6mm to 1mm.Distance between the adjacent scribe section is about 0.4mm to 4mm, preferably is about 1mm to 3mm, is most preferably 1.5mm to 2mm.Depth of score will depend on the thickness of film and change.

At certain some place initial recess can be provided along weak line.Initial recess provides the zone of tearing more easily, because line is darker.Wherein also have sheet behind the vertical leak free if weak line is crossed over, then initial recess makes weak line tear a plurality of layers of said vertical leak free easily.

Produce the method for weak line

Available following method produces weak line, and said method includes but not limited to line, punching, chemical treatment, the combination of preferably laser scribing, laser beam perforation, mechanical marking, mechanical punching, embossing method or these methods.Preferably before film being processed bag, on film, process weak line.

A kind of method of the weak line of processing adopts beam of laser at least on flexible membrane.At first, the laser beam that power is enough to evaporate a part of membrane material focuses on the film.Use laser technology to allow very accurately controlling depth or penetration level: to penetrate film fully from very shallow being scoring to.Can adopt the laser that utilizes any type of electromagnetic radiation.Being used for suitable laser of the present invention comprises based on CO ₂Those laser of gas.

The kind of desired line pattern and the degree of depth and used film is all depended in the speed of film and the motion of laser beam.The usability methods that is used for the laser scribing film is disclosed in the US Pat 3,626,143,3,790 of all authorizing American CanCompany; 744,3,909,582 with authorize the US Pat 5,158 of AmericanNational Can Company; 499 and 5,229,180; Authorize the US Pat 5,001,325 of LPFVerpakkingen B.V; Authorize the US Pat 4,743,123 of Wavin B.V; All authorize the Japanese Patent 09133018,07008283 and 06103200 of Dainippon Printing Company.

The another kind of usability methods of line is to use blade a little less than being used to produce.Blade is installed on the stamp cylinder, and the stamp cylinder is directly installed on the film processing machine, so that before bag is shaped, process otch.Can adopt the different blades pattern to obtain different weak line patterns.Also can during processing, change the pressure that is applied on the blade, thereby can open easily with the size and the degree of depth assurance bag of control otch.

Embossing is the another kind of alternative approach that produces weak line.The embossing technology makes the film reduction by means of pressure, temperature, time and deformable contour on the specific region.Desired result obtains through thickness and/or the material structure that changes embossing track place.The basic equipment that is used for embossing comprises the sealing clamp that can press the back plate.Deformable contour or pattern are fixed on the anchor clamps and heat.Between deformable contour and back plate, press film.The known primary variables that influences this technology is: the film tension force when heating-up temperature, chilling temperature, pressure, time of heat, hardening time, embossing, the film tension force after the embossing, back panel material, back plate thickness, back plate temperature, anchor clamps pattern and anchor clamps thickness.Embossing units will be installed in the back of film winding station, preferably be attached in the packaging facilities line.The embossing case description that is suitable for is in the US Pat 5,878,549 of authorizing American National Can Company.

Again packaged unit

Again packaged unit preferably can be resisted the pollution of the content of bag.Its main objective is that protection is contained in other external factor that grain products in the bag avoids spilling, make moist and possibly influence the product integraty.This packaged unit again preferably includes the machanical fastener that is connected to flexible pouch, more preferably is hook-loop or hook-hook type, and it allows the customer to open along with the use of product in the bag and seals said bag securely many times.

Said parts comprise with fastener material be placed on the bag relative sheet on.Although imagined other configuration, in a preferred embodiment, said is anter and back sheet.Fastener can be disposable material or industrial materials.It is desirable to adopt disposable material to optimize cost.Machanical fastener can be Any shape and size, and can be in any position.Again the particular configuration of packaged unit assembly should make bag between the whole used life that is contained in product wherein, to be sealed." by sealing " is meant when with the bag inclination do not have product to spill.Specifically, packaged unit is characterised in that from an assembly of fastener and peels off another assembly energy needed again.This energy preferably should not be contained in the product in the bag less than the every Kg of 2.4Kgfmm/.

In a preferred embodiment, ring material has less than 40 gram/sq ms (gsm), is more preferably less than the basic weight of 30gsm.Preferably, the basic weight of hook material is less than 200gsm.Specifically, have been found that ring material is for example effective especially by the N29 that Aplix supplied of France.For hook, low basic weight extrude polypropylene hooks for example the Aplix that Aplix supplied 963 of France be preferred.

Again packaged unit is intended to and the above-mentioned parts collaborative work of opening easily that helps to open bag.At least one machanical fastener is placed on the sheet of bag, simultaneously a matching fastener is placed on the relative sheet of bag.Preferably, a machanical fastener most preferably adheres to two interactional horizontal bands the inside of anter and back sheet for adhering to the horizontal band of bag in-to-in under weak line.

Can these machanical fasteners be adhered on the bag through adhesives.Adhesives can be hot-melt adhesive or pressure sensitive adhesive.Just before being administered on the bag, hot-melt adhesive is administered on the machanical fastener said.Pressure sensitive adhesive is adhered on the fastener to become one.

These machanical fasteners are administered on the bag and can realize in a different manner.A kind of mode is before producing bag, these fasteners to be adhered on the film.In this case, prepare in the film net or on the machine with the film net from the volume in the uncoiling, the sheet of machanical fastener is attached on the film.In an alternative embodiment of the present invention, can be with the bag preform, and can machanical fastener be adhered on the bag after bag so is shaped.

Yet, in a preferred embodiment of the invention, hook-loop is adhered on the flat film.Most preferably, a ring bar and two hook bars or a hook bar and two contiguous weak lines of ring bars are administered on the flat film.This makes again packaged unit can leave beyond the bag length potted line, intactly around the bag opening packaged unit again is set basically simultaneously, to allow customer's complete closed bag.If the application of packaged unit separates with the bag forming process and on different machines, carries out again, then from the viewpoint of the roll stabilizing property before converting film in bag, this provides tangible advantage.

According to this embodiment of the present invention, it provides the method that is used for being formed by the film net bag, and wherein said film net transmits along one or more shaping machines in the vertical, and the vertical direction in membrane plane is laterally, said method comprising the steps of:

(b) the contiguous weak attached packaged unit again of line;

(c) cut with diaphragm seal with formation comprise weak line and packaged unit again bag; And wherein the step (a) and (b) with (c) can on same or independent machine, carry out step (a) and (b) accomplish before preferably in step (c) with any order; And along net with fixed interval repeating step (a) and (b) with (c) to form a plurality of bag.

In one first embodiment, roughly the film net transversely use hook, and roughly the film net vertically on use the ring bar.

In Fig. 5, shown preferred second embodiment.With hook 36 and/or encircle 34 the contiguous weak line 28 of a series of sticking patch and be administered on the film net 30.This has the following advantages: allow between adjacent sticking patch, to produce the gap and be used for cost-cutting to reduce making of hook or ring, still make effectively sealing of bag simultaneously.

As other a kind of selection, use sticking patch that using of hook can be carried out as a series of the using on the film net is vertical.With using and compare in the horizontal as noted before, this carries out usually more easily, and hook and ring relative to each other direction in bag is complementary to optimize closed performance.In fact, can sticking patch be administered to film with any angle between horizontal and vertical and control closed performance on the net.

In a preferable methods, adopt a machine to come execution in step (a) and (b), and adopt the independent machine that is in diverse location to come execution in step (c).

In another preferable methods, adopt three independent machines three separate location independently the execution in step (a) and (b) with (c).Under both of these case, execution in step (a) and machine (b) will launch film when step begins, when step finishes, again film is rolled into volume then, make film can easily be transferred to next machine and carry out subsequent processing.These two kinds of preferable methods have separates the advantage that different operations are made final bag.This separately allow to use than the high speed machines of peanut come execution in step (a) and (b); Thereby produce the film of pre-processed closed material again and weak line; Can on a plurality of Bag Making Machines, process said film then, Bag Making Machine is usually to move than execution in step (a) and the slower speed of machine (b).This makes capital investment lower, because only need small number of machines to come execution in step (a) and (b).This makes that also work efficiency is better because step (a) and (b) not with the complicated bag process confused of step (c).This also allows to select to set up the off-line stock of the film of pre-processed closed material again, to guarantee providing film to step (c) always.And; This makes the step (a) and (b) and (c) can independently carry out; Thereby allow easily to process and have no the weak line or the bag of closed material again; Perhaps have only the weak line or the bag of closed material again, perhaps not only had weak line but also had again the bag of closed material, and need not change machine or technique initialization greatly.

Preferably, a bag forming step (c) may further comprise the steps: folded membrane to be forming anter, back sheet and relative lateral plate, and the opposite edges of adjacent membrane seal forming the back sealing, and cut with diaphragm seal to form top and bottom seals.

In a preferred embodiment of the invention, all basically anters, back sheet and the lateral plate carrying out operation (b) and (c) make again packaged unit center on the bag inside extend.

Claims

1. one kind comprises the weak line (28) that is easy to open and the bag (10) of packaged unit (32) again; Wherein said bag (10) comprises anter (12), back sheet (14) and relative lateral plate (16; 18), said each sheet is sealed to together so that top (24) and bottom (26) to be provided, and wherein said weak line (28) is around all anters (12), back sheet (14) and lateral plate (16; 18) extend; So that can said top (24) remainder from said bag be removed fully, the contiguous said weak line (28) of wherein said packaged unit again (32) is connected to said anter (12), back sheet (14) and lateral plate (16,18).

2. bag as claimed in claim 1; Wherein said lateral plate (16; 18) between said anter (12) and back sheet (14), form corner plate, and the lateral plate (16,18) of wherein said anter (12), back sheet (14) and formation corner plate is in relative end (20; 22) locate sealed together to form top seal and bottom seals; And wherein said weak line (28) extends around the lateral plate (16,18) of all anters (12), back sheet (14) and formation corner plate, so that can the remainder of said top seal from said bag be removed fully.

3. bag as claimed in claim 1 (10); Wherein said packaged unit again (32) centers on all basically anters (12), back sheet (14) and lateral plate (16 on the inboard of said bag (10); 18) extend; The contiguous said weak line (28) of said packaged unit again (32) is connected to said anter (12), back sheet (14) and lateral plate (16,18), so that said bag (10) can sealed again in said top (24) after the remainder of said bag removes fully.

4. bag as claimed in claim 1 (10), wherein said packaged unit again (32) comprises machanical fastener, said machanical fastener comprises the hook and/or the ring of working in coordination.

5. bag as claimed in claim 4 (10), wherein said ring material has the basic weight less than 40 gram/sq ms, and the basic weight of said hook material is less than 200 gram/sq ms.

6. one kind comprises the weak line (28) that is easy to open and the bag of packaged unit (32) again; Wherein said bag (10) comprises anter (12), back sheet (14) and relative lateral plate (16,18), said lateral plate (16; 18) between said anter (12) and back sheet (14), form corner plate; And the lateral plate (16,18) of wherein said anter (12), back sheet (14) and formation corner plate is located sealed together to form top seal and bottom seals in relative end (20,22); And wherein said weak line (28) is around the lateral plate (16 of all anters (12), back sheet (14) and formation corner plate; 18) extend so that can the remainder of said top seal from said bag be removed fully, wherein said packaged unit again (32) comprises machanical fastener, and said machanical fastener comprises the hook and/or the ring of working in coordination; The contiguous said weak line (28) of said hook and/or ring is connected to said anter (12), back sheet (14) and lateral plate (16,18).

7. bag as claimed in claim 6 (10), wherein said ring material has the basic weight less than 40 gram/sq ms.

8. bag as claimed in claim 6 (10), wherein said hook material has the basic weight less than 200 gram/sq ms.

9. one kind forms the method for bag (10) by film net (30), and wherein said film net (30) transmits along one or more machine in the vertical, and the vertical direction in membrane plane be horizontal, said method comprising the steps of:

(a) the weak line (28) of the whole width that crosses said film basically roughly is provided in the horizontal;

(b) the contiguous said weak attached packaged unit again of line (32);

(c) cut and seal said film, comprise the bag (10) of said weak line (28) and said packaged unit again (32) with formation; And

Wherein the step (a) and (b) with (c) on same or independent machine, carry out with any order;

And along said film net with fixed interval repeating step (a) and (b) with (c) to form a plurality of bag.

10. the method that forms bag (10) as claimed in claim 9, wherein step (a) and (b) accomplish before in step (c).

11. the method that forms bag (10) as claimed in claim 9; Wherein step (c) may further comprise the steps: folding said film is to form anter (12), back sheet (14) and relative lateral plate (16; 18); The opposite edges of contiguous said film seal to form the back and seal, and cut and seal said film to form top seal and bottom seals.

12. the method that forms bag (10) as claimed in claim 9, wherein folding said film is so that said packaged unit again (32) extends around all basically anters (12), back sheet (14) and lateral plate (16,18) on the inboard of said bag (10).

13. the method that forms bag (10) as claimed in claim 12, wherein said packaged unit again (32) comprises machanical fastener, and said machanical fastener comprises the hook and/or the ring of working in coordination.

14. the method that forms bag (10) as claimed in claim 13, wherein said ring material has the basic weight less than 40 gram/sq ms.

15. the method that forms bag (10) as claimed in claim 13, wherein said hook material has the basic weight less than 200 gram/sq ms.

16. the method that forms bag (10) as claimed in claim 9, wherein said weak line (28) forms through line, punching, chemical treatment or embossing method.

17. the method that forms bag (10) as claimed in claim 16, wherein said weak line (28) forms through laser scribing, laser beam perforation, mechanical marking or mechanical punching.