JPS6099857A - Bag with wicket with extended side seal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a plastic pancaging bang with wickets.
The present invention relates to a site-sealed wicket bag with an extended 1ip lip.

Side-sealed bags are conventionally made by slitting one collapsed edge (θ) of layflat tubing and then forming a pair of side-by-side heat seals and a weakened line between them. Layflat 3 by heat sealing the limb canals at regular intervals transversely to produce
A slit edge produced in succession from the .-shaped film forms the bung opening and one transverse seal C, J, the bag side. In manufacturing a series of extended lip bags, a longitudinal strip along one side of the layflat tube is removed adjacent the tube edge that is to become the mouth end of the bag. Such bags thus have a front panel that is shorter than the rear panel so that the bung opening is at the upper edge of the front tongue. Multiple bags loaded on the wicket weigh 71g
Loading the product t1 into the bang
) Wicketholes are provided in the extended lip of the panda to facilitate this. Product stuffing using wicket-picking bags typically involves stacking the wicket-bearing bags on a wicket post at the product-stuffing station, then using an air jet to inflate the bag at the mouth end of the top bag, and then tearing the wicket into the bag. The process of compressing the product into an inflated bag with sufficient force to pull the bag from the wicket post as occurs in the hole.
A k. This sequence is repeated for a series of products until one wicket and one bag stack is completed.

The problem that has arisen with side-sealed wicket bags is that the side-seal integrity (
The termination point of the side seal at the eye edge of the bag is relatively weak, thus forcing the product into the inflated wicket bag (integrity).
A force is exerted on the bung mouth that tends to delaminate the side seal at its relatively weak termination point before the bug tears from the Witz post. It is noted that the above problem does not appear when using end-sealed wicket picking bags; one method that has been adopted in an attempt to overcome this problem is to provide a tear-initiating slit at the top of the wicket hole. Ta. however,
This method involves a series of perforated such bags being split into individual bangs in a bag separating device.
The present invention is directed to complete reinforcement of the side seal terminations in such bags.

What generally attracts attention is the “5ide” issued on March 12, 1968 for Play 7 (Brayla).
5eal Bag Construction wit
543.372.857 for ``StreeB Rθliθf Note) 1'', which uses a spout to prevent zyde seal delamination during loading of product into bags while being wicketed. The present invention is directed to a wicket bag with side-sealed extended lips having a heat-fused stress relief notch near the end of the side-seal.

Of general interest is the Plast issued to Ericsson on April 16, 1974.
ic Bag Having Arcuate Clos
ed End and Arcuate Lipped
U.S. Patent No. 3.804゜3 for “Open End”
No. 22 discloses an end-sealed wicket bag having an arcuate mouth end and an arcuate cutout in the front 9tj bag panel opposite the Reike rating hole in the rear bag panel. This structure forms a lip at the mouth end of the end seal bag for manual collection of the bag mouth during product filling.

The main object of the invention is to ensure that the bag is completely reinforced in the bag opening area (during the product stuffing period) so that the bag can be torn preferentially at the wicket hole rather than at the side seal termination point ('
buff with side sealed extended lip wicket (integrally reinforced) (5ide 5ealedex)
tented lip wicketed bag)
Chiru by providing.

Thus, in a wicket bag comprising a flexible thermoplastic material bag, the rear panel has an extended lip with one or more wicket holes. ! The side-sealed edge of the front panel of the bag opposite the extended lip (marginal extensi
ons), the length of the extension being one wicket during the loading period of product in the bag, loading forces.
) extends the side seal sufficiently beyond the bung opening such that the active surface of the side seal intersects the side seal substantially below the extended terminal point of the side seal. be done.

In a preferred embodiment in which the wicket bag has symmetrically positioned wicket holes, the area of application of the packing force is substantially such that the wicket holes are spaced apart from each other in their layflat Sθ para- tion. the first point and the second point on the top of the wicket hole respectively in the state where the bag is located at the top of the wicket hole; It lies in the plane defined by the third point at the center of the class of the bag opening when unfolded.

Preferably, the Zydeseal extension extends from the bag mouth to at least approximately the top of the wicket hole, and most preferably extends to the top of run zero.

The method of manufacturing a wicket bag with a side-sealed extended lip further comprises: forming a side-sealed extended lip on the front bag panel at the bottom end to form an extended lip and a side-sealed extension of the opposite hem in the front bag panel; A cutout is formed to partially expose the rear bag panel and the side seal's extended termination point is the area on which the stuffing force is applied during stuffing of the bag during wicking. A method is provided characterized in forming one or more wicket holes in said extended lip selectively positioned to intersect said side seal more substantially below.

A more detailed explanation will be given with reference to the accompanying drawings.

FIG. 1 shows a side-sealed extended lip wicket bag improved in accordance with the present invention.
5ealed extenea 11 pwicked
bag) 10 is shown. Grasshopper 10id side heat seals 13a, b and edges (, marginal
ly) Jointed front noggle 11 and rear side noggle 1
It has 2. The side seals 13 are spaced apart by a width 14 that defines the width of the product-containing envelope of the panda 10.

The bag bottom 15 may for example be made of a layflat tubular film.
It may be seamless as shown. The rear panel 12 has a greater length than the front panel 11 to allow for extensions and protrusions 16. The mouth 17 of the bag is spaced below the top of the lip extending a distance 25, which is the height of the lip. Thus) the product-containing envelope of bag 10 has a length of 1
An extended lip 16 extending from 7 to the bottom 15 has punched pairs of wicket holes 13a,b, with pairs of wicket holes 18a,b positioned symmetrically across the bag and spaced a center distance 19 apart. ing. The bottom of the wicket hole 18 is located at the front panel 11.
Normally this would be at or above the bung opening 17 so as not to interfere with the insertion of the wicket post through the wicket hole 1, although this is not preferred. In other words, the bottom can be drilled so as to cut through the front wicket hole a small distance 1jj16% below the rim at radius 1 of the wicket hole. The tops of the wicket holes are spaced 11' a selected distance of 20 degrees below the top of the extended lip 16.

According to the invention, the bag kl front nozzle 11 has side seal hem extensions 21 &, 21b extending upward from the mouth 17. The length of the extension f31S21 is further determined by Although it is not necessary that the minimum length of the extension be large, good experience shows that it extends to or above the top of the wicket hole 18.
i.e., preferably, the spacing 22 will be approximately equal to the spacing 20 or less than the spacing 20j.
In the case of the FJ joint, the S extension part 21 may further extend to the m part of the lip 16 extending by one as described below. The width of the extension 21 is indicated at 24 and generally extends from the side seal 1
3 to be formed along the edge extension 21 without difficulty. However, the width of the extension 24 is not so wide as to obstruct the wicket hole, preferably from a 1-g crease (puckθrin(
7), thereby improving the bag's layflatness (
To improve layflatness, the extension width 24 is made larger than the heat affected zone near the seal 15. Typically, extension width 24 will be at least one inch. The purpose of the sealed heli extension 21 is to provide a wicketed configuration.
extending the bag side seal at least approximately the necessary distance beyond the bag mouth so that during product filling of the bag during product filling the bag does not act substantially against the relatively weak side seal endpoints in the configuration); Therefore, during one product filling period, the bag preferentially tears λi at the wicket hole rather than at the end of the side seal. Preferably, roundings 25 are provided at the trailing joint between the hemline extension and the baglo for stress relief purposes.

In FIG. 2, a preferred form of the present invention is shown for a particular bag 1o''rf.
It is similar to bag 10 in all respects except that it is fully extended at the top end of the extended lip at 55. This arrangement promotes convenience in bag construction and provides a conventional side-sealed bag from a lay-flat tubular film as described above, followed by a generally U-shaped end section in the front bag A-flank. It can be easily formed by creating a cutout section.

A wicket hole is then formed in the thus exposed portion of the rear bag pawl, ie, the extended lip, and selectively positioned relative to the side seal termination in accordance with the present invention. A series of such bags, preferably with one hole, first supplies one infinite length of layflat tubular film, slits one crushed edge of the layflat film, and slits one crushed edge of the layflat film on one side and cutting U-shaped cutouts at the slit line at regular intervals along the length of the layflat film and punching selectively located wicket holes in the areas exposed by the cuts;
Next, along the lay-flat film, holes were made at regular intervals between the nine cutouts, and the lines that simulated the strength were lined up so that they were between the heat seals. Manufactured by forming pairs of loaf direction heat seals. The bag of FIG. 1 can be manufactured in a similar manner except that the cutout has a flanged U-shape as shown. Conveniently, the side heat seal bead can reach the top of the extended lip two inches beyond the side seal extension.

In FIG. 6, which is a side view of the bag 10 of FIG. 1, the product stuffing forces acting against the mouth of the bag are shown and shown in a wicked and inflated configuration 10A to illustrate the principles of the invention. ing. Each bag has a wicket hole 18a.

Through 18b and positioned on the wicket post (not shown) is the edible fowl fi(w).
holθ pOultr7) as f1. A jet of air is directed into the bag to inflate it as shown to facilitate insertion of the jfQ item. The bag is restrained by the wicket pillar, indicated by the center t/i50 of the wicket hole IBa, and the restraint point is point 51.
The top of the wicket hole forced against the wicket post at . The inflation of the bag while restrained in its wicket holes is 35 below the side seals 16 (although the inflation above the side seals shown at 152 is equal to 7 of the spacing 14 or about 7 of the spacing between the side seals). The expansion of the panda shown in is from the interval 14 to the wicket hole interval 1
One point 54 that inflates the bag equal to about 9 minus 7 is the center of the bung mouth or the inflated bag, which is the main point of contact when thrusting the product into the inflated bag. Indicates the top point of the bag opening. Thus, the product packing force (
The proauctloading forces are the reaction forces at point 31, which is the point of restraint of the wicket hole relative to the wicket post, respectively.
Line 55 represents the line of action of the stuffing force which intersects Zide seal 15 in the vicinity of position 66, which will act on the bag mouth substantially at point 34 with rce). The line 35 would more precisely be characterized as the action of the stuffing force 1f11 at position 66t, which would occur a small distance 1%i1: below the top of the wicket hole 51. The principle of the invention is therefore that the packing force acts on the bag side seals in the intermediate zone, which is one point away from the 14 points, after the relatively weak seal at 67. If the active surface passes through point 57 or passes to the right of point 67, then the side seal of the bag←], ?++'jProbably peeled off during the packing period:tt
, Ly, Pj+fi, etc.

It is generally noted that the line of action of the tie-in force or its intersection with the plane and side seals is easily determined by visual observation; The test is simply carried out by first arranging the pandas, then restraining the bag at the top of its wicket hole against the surface, and then widening the bung mouth fully at approximately the center of the rim. . In this expanded and slightly elongated configuration, the lines of toutness are clearly visible and the distribution of their relative tautness can be easily discerned by contact. Therefore, the location of the intersection of the darning tension line and the side seal can be easily seen. The surface of action of the packing force is considered to span approximately the same space as the line of maximum tension (coθxtθn5ive), and the surface of action is 1 when the tension or stress distribution on this surface is approximately 0 at the end of the side 7-le. Generally speaking, it is considered to be below the end of the side seal.

As a preferred practical experience, the side seal lip extension 21 should extend from the bung mouth to at least approximately the top of the wicket hole at point 61. (in the case of As a first approximation, the required minimum extension will be somewhat smaller, as determined from geometric constraints, and on an elastic basis, by modeling the side seal as Two upper X"D-1) I: ' 1 + ((D/b) -1)
(C-a)/(2C-a) J+ 1.8 (Ewh'
, /l'() 'where X = the required minimum extension length of the side seal 1 a - the distance between the centers of the wicket holes pjfU and b - the distance from the top of the lip to the Leichent hole n1 mountain to the top a■1 (
, h C - bag width interval between side seals, p = I
It is the distance from the top of the J-tube to the bang opening, W = width of the side seal bead, h = thickness of the side seal, ~ = film spring constant, and E - elastic modulus of the film. Ru.

To illustrate the use of the above formula in calculations, a side-sealed groove made according to Figure 81 with a center-to-center distance of 6 inches (a) and an extended lip. The distance from the top of the wicket hole to the top of the wicket hole is 1.61 inches (b).

The bag width between the side seals is 85 inches (C) and the bag mouth is 2 inches (C) below the top edge of the extended lip.
I)) The side heat seal of the bag is selected for practical purposes, i.e. just below the wicket hole, with a heat seal bead of 1 liter? The plastic film has a film thickness of 0.002 inches and a modulus of elasticity of 53.
, 600 psi (resistance and fill 1 spring constant 18 bonds per inch per inch (K)).The spring constant is the stress divided by the tensile strain resulting from the stress. The unit volume of the test film to be applied by 1°?, divided by the film Jlp multiplied by the obtained tensile force is determined as 'i'. From the above formula, the side-sealed hem extension from the pangro The minimum length ΣΣ of the wicket hole can be calculated as α56・r inch (4).With this required minimum interval, the above extension part is placed between the top of the wicket hole and the center of the wicket hole. I would like you to stay focused on positioning yourself.

In this regard, there is essentially no tension on the side seal terminations, and the chance of seal failure due to packing forces is substantial if the side seals terminate with an extension of approximately 0.53 inches or greater. will decrease to

As an example, the bag of type 8 shown in Fig. 1 has an Tested against side seal failure below. Trial!
One method is (1) restrain the panda at the top of the wicket hole and (2) observe the applied force. (5) using a spring scale to pull the bang mouth downward at its center and at an angle of approximately 45° to the rear bag panel; The various modes of failure consisted of tearing the side seal from the mouth end, tearing the extended lip at the wicket hole, The front bag/gunnel was torn and the back panel was torn.

The test bag has an overall length of 14 inches with a wicket hole diameter of -
inches, the center wheel Pill s inches (a) and extends from the top of the lip α94 inches (b) 1.11
Bag width between the side seals is 6.5 inches (C) and the bag width is 6.5 inches (C) between the side seals and the mouth weight is F [1
11.75 inches (D) with a geometric granota of 49 (Pi). Side heat seal (tr1 heat seal bead width o, 028 inches (W)
) and 010 inch saliva) were characterized by seal parameters including II). bag heat ir
The film is characterized by film parameters including a film thickness of 0.002 inches, a modulus of elasticity of 33,600 psi (Rli), and a film spring constant of 10 volts per square inch (K). 4 Zora barrier films, generally of the type disclosed in U.S. Pat. No. 5,741,253, issued June 26, 1973, to IIrax et al.

The minimum side 7-rule extension length was calculated to be approximately 0.70 inches (4) using the above formula. The bags were tested near and under the required minimum extension length.

The results are shown in the data table below.

Mr. K A Number of bags broken 254 298 204 Number of bags broken in Zydoshi style 97 48 2 % of total 38 16 1 Average force at break (d India) 12,9 13.1 1a .

Standard deviation of side seal failure force 2.6 2.4 - From the data table above, test group A, which has a side seal extension length of about 40 inches, which is the minimum required extension, had a high rate of side seal failure of about 58%. It can be seen that the damage rate was high. Test Group B, which had an extension length approximately equal to 70% of the required minimum extension, had a substantially reduced side seal failure rate of about 16%. The side seal breakage rate was very close to the required minimum value and showed a sharply reduced 4i1 rate of about 1 inch.

Thus, it can be seen that the side seal failure rate slightly decreases as the one side seal extension approaches the minimum sand requirement 11r1-. Furthermore, it can be seen that the side seal failure force increases significantly from Group B to Group 0.

Although the invention has been described in terms of preferred embodiments, it should be understood that modifications and changes can be made without departing from the principle and scope of the invention as set forth in the claims.

[Brief explanation of drawings]

FIG. 1 shows a side-sealed extended-lipped wicket bag according to the invention having a side-seal lip extension at the mouth end of the bag on the front bag, six flanges. FIG. 2 shows a particular case of the above embodiment in which the side seal extension extends to the top of the extended lip in the rear bag panel. FIG. 6 schematically shows the stuffing force diagram for the first bag in the inflated and wicked configuration. In the figure, 10...Bag S with a wicket with an extended lip that is side sealed 11...Front panel) 12...
Back ([111) e Ne/shi, 13...side seal,
14...Width 115...Bag bottom, 16...Extended lip~17...Bang opening, IQa, 18b...
Wicket hole t19...Leichent hole center-to-center car! AI
L 20...Distance between the top of the wicket hole and the top of the extended lip 121...Side seal edge extension 1tBs
) 6... Height of extended lip 124... Width of edge extension) 60... Center of wicket hole 161... Top of wicket hole, 52... Side seal seal": 9 below Cedar expansion 1 54...Center of the bag hole (r, 1, top 5 of the bag hole when inflated
1155... line of action of tying force and direction of action, 66.
...Action of stuffing force f8N or t': Intersection of direction of action and side seal, 57...Seal termination point) 50...Bag, 51a, 51b...Side-sealed edge extension, 52. ...bag mouth, 56...l, if called lip 111 +'bud・me)ru.

Claims (1)

[Claims] 1. An elongated wicket whose rear iR channel has one or more wicket holes 1: with a wicket including side seal bags of flexible thermoplastic material. The bag is provided with a side-sealed helitar iξ length of the front side of the bag opposite the extending or protruding tongue, and the length of the volume extension is 1 the length of the bag while the bag is being held. Place the side seal far enough past the bung mouth so that during stuffing of product in the bung, the area of action of the stuffing force intersects the side seal substantially below the extended end point of the side seal. A bag with a wicket that is characterized by its extension. A wicket bag according to claim 1, which extends to the top. 5. The wicket pack according to claim 2, wherein the extension portion extends to the top of the extension lip. 4. comprising a pair of symmetrically located wicket holes, 1 and said working surface substantially comprising a pair of wicket holes, each with said wicket holes being spaced apart due to their lay-flat separation; the first point and the second point on the top of the bag, and the green color of the bag opening when the bag is restrained at the first point and the second point and the reading opening is fully widened; 2. A bag with a wick as claimed in claim 1. 5. The extension portion satisfies at least the following relational expression X=D−
br1+((D/D)-1XC-a)/(2cma)J
+1.8(Ewh'/K)' where: 1 X - the minimum necessary extension length of the side seal - a - the distance between the centers of the wicket holes, which must be 1b = from the top of the lip to the top of the wicket hole 1 C = distance between side seals and bag width irx; D - distance from top of lip to bag 1 x 1 + yrt; W - width of side seal bead; h = side seal The thickness of the VC is equal to the film spring constant, and E=the elastic modulus of the film, and the VC extends to the necessary minimum extension determined by Bang with wicket. 6. The wicket bag according to claim 1, wherein the width of the extension is sufficient to exceed the thermally shaped area around the side seal. A bag with a wicket according to claim 1, wherein a stress-relieving roundness is provided at a connecting part of the parts. A method of manufacturing a side-sealed extended-rigged wicket bag, comprising: a) a front panel of the bung so as to form an extended lip and opposed helical side-seal extensions in the bag channel; A cut-out part is formed at the lower end to partially expose the back side of the bag, and b) the action of the stuffing force during the stuffing of the product into the bag while it is being wicketed. The surface is suitably positioned to intersect the side seal substantially below the extended terminal point of the side seal. 9. The direction θ1. according to claim 8, wherein the cutout portion is generally formed in a flange-like U-shape. . 1 [L The method of claim 9, wherein the wicket holes have their tops at or below the top V of the side-sealed extension. 8. The cutout portion is generally U-shaped and includes forming a pair of symmetrically positioned wicket holes;
and the working surface is substantially connected to a first point and a second point at the top of the wicket hole, respectively, with the wicket hole spaced apart by a lay-flat separation thereof; defined by a sixth point l') at the center of the edge of the bang mouth when the eyes are fully dilated while being restrained by the first point and the second point. 9. The method according to claim 8, which lies in the plane of the invention. 15 The extension is at least approximately relative to the top of the wicket hole according to the following formula (%), where X = the length of the minimum necessary extension of the side seal, a = the distance between the centers of the wicket holes Dovetail 1b = Distance from the top of the lip to the top of the wicket hole, C = Bag width spacing between buzzed seals, D = Distance from the top of lJ pump to the top of the pangroshade, W = Side seal bead. , where h is the thickness of the side seal, K is the film spring constant, and E is the elastic modulus of the film, so that it is the minimum extension determined by It seems that it extends to! 14. A method according to claim 8, comprising forming a wick portion and ii positioning a wicket hole, 14. 9. The method of claim 8, wherein the width is greater than the area subjected to the thermal deformation.