CN1942367A - Gable-top package for pourable food products and method for dimensioning thereof - Google Patents

Abstract

A gable top package (1, 1') for pourable food products produced by folding and sealing a sheet packaging material (2) and provided with a gabled top portion (4) including front and back sloping top wall (10, 11) joined together at a top transversal seal (12), and a pair of side top walls (18, 19) connecting respective lateral edges (15, 16) of said front and back sloping top walls (10, 11) and obtained by folding respective portions (46, 47) of the sheet packaging material (2) along predetermined crease lines (31, 33, 42, 44, 50, 51, 54, 55, 56, 65; 31, 33, 43, 45, 52, 53, 57, 58, 59, 66) delimiting a number of panels (A, B, C, D, E, F, G); the above mentioned crease lines (31, 33, 42, 44, 50, 51, 54, 55, 56, 65; 31, 33, 43, 45, 52, 53, 57, 58, 59, 66) are determined among a plurality of possible crease lines designed so as the forming of the side top walls (18, 19) is performed by means of rotations of the panels (A, B, C, D, E, F, G) as rigid bodies about their respective crease lines (31, 33, 42, 44, 50, 51, 54, 55, 56, 65; 31, 33, 43, 45, 52, 53, 57, 58, 59, 66).

Description

The method that is used for the chevron roof packing of pourable food and is used for determining its size

Technical field

The present invention relates to a kind of chevron top (gable-top) packing that is used for pourable food.

Background technology

As everyone knows, many pourable foods, for example fruit juice, UHT (ultra-high temperature is handled) milk, wine, tomato juice or the like are contained in the packing that aseptic packaging material makes and sell.

Packing have and comprise for example multiple-structure of fibrous material layer such as paper of one deck, and its two sides is coated with the heat seal plastics, for example polyethylene; Under the situation of the aseptic packaging that is used for long-term storage food such as UHT milk, packing also comprise the oxygen isolated material that one deck is limited by for example aluminium film, it is stacked on one deck heat seal plastics, and covered by another layer heat seal plastics, this layer heat seal plastics finally define packing with the contacted inside face of food.

The typical case of this packing is the packing that is used for the parallelepiped shape of liquid or pourable food, for example known Tetra Brik Aseptic (registered trade mark (RTM)) packing and pack with the what is called " chevron top " of trade name Tetra Rex (registered trade mark (RTM)) known to usually, it has by two inclinations that connect together in top cross sealing place or the chevron top portion that sloped wall limited.

More than packing can be formed by continuous pipe, and described pipe is by involving in line bend to packing and longitudinal sealing obtains; This carries out aseptic process by applying chemosterilant such as superoxol the packing volume on wrapping machine, after sterilization, remove chemosterilant by heating evaporation from package material surface.So the volume of the packing after the sterilization remains in the osed top gnotobasis, and folding and longitudinal sealing gets up and forms vertical tube.

This pipe is filled with food aseptic or aseptic process, and seals and carry out cross-sectional cut equally spacedly, to form pillow packs piece installing (pack), afterwards it is mechanically folded up to form finished product packing.

Involving in of two kinds of fundamental types expects that filling and shaping machine are known: first kind of more general type is the machine with two pairs of reciprocating type clamps; Such machine comprises, for example by the Tetra Pak Carton AmbientAB company that is positioned at Sweden Lan De city Ruben Rausings gata and TB/21, TBA/19 and TBA/21 series machine and the Tetra Pak A3 wrapping machine produced by the Tetra Pak CartonAmbient S.p.A company that is positioned at Modena, ITA city Via Delfini 1.The wrapping machine that involves in material of second type is the loop chain type, wherein, be shaped and sealing unit by two practise physiognomy to loop chain but not carry by reciprocating type clamp.An example of this machine also is the TB/22 wrapping machine of being produced by Tetra Pak Carton Ambient S.p.A company.

For allow packing twist in be shaped and last folding process in fold, on packing, forming broken line on the flow production line, it defines so-called " folding line pattern ".

As alternative, packing can be cut into half-blank, it forms packing on the rolling roll forming machine, and finished product packing loaded onto food, and seals.

Specifically, in case be shaped being rolled on the circular knitting machine, uncompleted packing just has the parallelepiped shape of upward opening; Thereby the opposing sidewalls on the top of packing by not completing is compressed the upper limb that upwards spurs other wall toward each other, afterwards it is sealed, and with the formation transverse sealing, thereby obtains the chevron top portion.

In case be shaped, the packing of the above-mentioned type can be accepted further procedure of processing, for example adds the opening device of Reclosable.

The chevron roof packing can be easily uses together in conjunction with the opening device of Reclosable, because the inclination roof is wideer than the corresponding straight portion of parallelepiped, and therefore allows and is applied with bigger opening device, for example loads onto spiral cap etc.

In packaging industry, need when guaranteeing that packing are correctly folding, improve constantly the possibility of the shape and size of especially distinguishing the chevron roof packing.This requirement source in the packing the relevant market demand of outward appearance aesthetic variation, and for varieties of food items, need guarantee do not having well-known choking to fill in the demand of toppling under the condition of phenomenon, this plug phenomenon of choking is promptly exported food product flow discontinuously from packing, it is characterized in that flowing and stop up and the alternating state of significantly gushing out, food may be sputtered out.

As for after a bit, therefore should be noted that different food may have different viscosity, and need the chevron top portion to have different height, to guarantee correct toppling over.

Summary of the invention

One object of the present invention provides the packing of a kind of chevron top type, its can be very simple and inexpensive manner satisfy the demand.

This purpose realizes by the chevron roof packing described in the claim 1.

Another object of the present invention is to design a kind ofly to be used for determining difform chevron roof packing size, to guarantee the method that packing are correctly folding simultaneously.

This purpose realizes by the method described in the claim 5.

Brief description

Below will be by example and with reference to the accompanying drawings to describe the present invention two nonrestrictive preferred embodiments, wherein:

Fig. 1 is the transparent view according to chevron roof packing of the present invention;

Fig. 2 is the transparent view of the more high range on Fig. 1 top of packing;

Fig. 3 is the different transparents view of pillow packs piece installing with Fig. 4, and this pillow packs piece installing has constituted the freak oil that are used to produce packing shown in Figure 1;

Fig. 5 is the transparent view of the more high range of top in folding process of Fig. 3 and packing shown in Figure 4;

Fig. 6 is the package sheet material that has the folding line pattern that is used for shop print 1 packing;

Fig. 7 is the view of the more high range of a package sheet material part shown in Figure 6; With

Fig. 8 is the transparent view according to another embodiment of chevron roof packing of the present invention.

Be used to implement optimal mode of the present invention

Referring to Fig. 1, label 1 expression is according to the chevron roof packing that is used for food of the present invention.

Packing 1 is made by the package sheet material 2 (Fig. 6) that is called " material 2 " hereinafter, and the chevron top portion 4 that consists essentially of the main portion 3 of parallelepiped shape and upwards define main portion 3 borders.

Specifically, material 2 defines the definite length of packing, and this packing are used to produce individual packaging 1, and has the multiple-structure of described type before.

Main portion 3 has and is preferably square diapire 5, antetheca 6, rear wall 7 and pair of sidewalls 8,9.

Chevron top portion 4 comprises top rake roof 10 and the rear-inclined roof 11 that is provided with opening device 24 (Fig. 1), and rear-inclined roof 11 seals 12 places in the top cross of packing 1 and links to each other with top rake roof 10.

Chevron top portion 4 also comprises a pair of top- side fin 13,14, it seals the respective side end portion 12a at 12 places adjacent to top cross, 12b, and be folded in outside the used pack top volume of food, thereby define along the prolongation of respective side walls 8,9 and the corresponding triangle side roof 18,19 that extends.

Each lateral side flap 13,14 has one side that the relative side 15 by top rake roof 10 is limited, and by the associated side end portion 12a of top cross sealing 12, and 12b is formed and be folded in another side on the relative side 16 of rear-inclined roof 11.

Lateral side flap 13,14 is folded in the corresponding gable top of sidewall 8,9 and divides on 20; As after explain more clearly, top portion 20 is straight, and with respective side walls 8,9 coplane or slope inwardly slightly basically.

In order to understand the shape of packing better, arrive Fig. 7 referring now to Fig. 3.

Packing 1 can be made by continuous pipe (not shown) shape packing, and it is by involving in line bend to packing and longitudinal sealing obtains, and is limited by the repeat length of material 2 (Fig. 6).Or rather, 21 stacks of the marginal portion of material 2 also are sealed on the opposed edges part 22, thereby obtain basically the longitudinal sealing 23 that extends along the vertical center line of the rear wall 7 of finished product packing 1.

Afterwards, at regular intervals pipe is carried out transverse sealing, thereby form transverse sealing, cut along this transverse sealing then, to form so-called pillow packs piece installing (not shown), it is adapted to pass through a plurality of last folding steps and becomes finished product packing 1.

What known is, the pillow packs piece installing has the essential part of parallelepiped and relative convergent shape end portion, and the end portion of this convergent shape is tapered to corresponding transverse sealing from this essential part.

Fig. 3,4 and 5 have shown that label is 26 tundish piece installing, it is obtained by flattening one of them convergent shape end portion by the pillow packs piece installing.

Specifically, tundish piece installing 26 comprises respectively the wall 5 with the main portion 3 of finished product packing 1,6,7,8,9 corresponding parallelepiped essential part 28 and four sidewalls that define by diapire, and top convergent shape end portion 29, it is designed to limit the chevron top portion 4 of finished product packing 1, and is tapered to top cross sealing 12 from essential part 28.

More particularly, top convergent shape end portion 29 defines the top rake roof and the rear-inclined roof 10 of finished product packing 1,11, and be provided with from top rake roof and rear-inclined roof 10, the lateral side flap 13 that 11 opposite side is outstanding, 14, it is suitable for being folded on the respective top part 20 of sidewall 8,9 as mentioned above.

As alternative, tundish piece installing 26 can be made by the packing half-blank that is equivalent to material 2 length separately; This half-blank forms package being rolled on the circular knitting machine (not shown), and formed package is loaded onto food and sealed.

Material 2 (Fig. 6) comprises folding line pattern 30, i.e. many line of weakness that obtain by the wrinkle roller, it has formed broken line, can be shaped and last folding step during along described broken line material is folded.

By known methods, folding line pattern 30 comprises four transverse crease lines 31,32,33,34; Line 31,32 is near the lateral end of material 2, and defines corresponding top and bottom transverse sealing area 31a, 32a; Line 33,34 has formed the level angle of chevron top portion 4 and diapire 5, and for clarity also at Fig. 1, shows in 3,4 and 5.

By known methods, folding line pattern 30 also comprises side corner that forms packing 1 and four longitudinal broken lines 35 that extend between transverse crease lines 33 and 34,36,37,38, and many broken lines 40 in the zone that is included between broken line 34 and the bottom transverse sealing area 32a, it is designed to produce the bottom sides fin (known but not shown) of tundish piece installing 26, and described bottom sides fin is suitable for being folded and flattens and obtain diapire 5.Line 40 has known layout, is not described in detail at this.

Longitudinal broken line 35,36 is near corresponding lateral section 21,22, and longitudinal broken line 37,38 is between line 35 and 36.

For clarity, the antetheca 6 of packing 1 is limited by line 37 and 38, and rear wall 7 is limited by line 35 and 36, and sidewall 8 is limited by line 35 and 37, and sidewall 9 is limited by line 36 and 38.

Folding line pattern 30 (Fig. 5 and Fig. 6) also comprises many auxiliary broken lines, and it is in the zone that is included between transverse crease lines 31 and 33.These auxiliary broken lines comprise four roughly broken lines 42,43,44,45 longitudinally, and it defines the side corner of top rake roof 10 and rear-inclined roof 11, and originate in the intersection point 35a of line 33 and each bar vertical line 35,36,37,38,36a, 37a, 38a.In the example shown, line 42,43,44 and 45 slight inclination and form the upwards wall 10,11 of the trapezoidal shape of convergent, but can be fully longitudinally, that is, constituted vertical line 35,36,37,38 prolongation.

Line 42,44, comprise the top cross sealing area 31a part between online 42 and 44, and line 33 be included in the top portion 20 that a part between intersection point 35a and the 37a defines tab area 46 and sidewall 8, this tab area 46 defines lateral side flap 13.Similarly, line 43,45, the part that comprises the top cross sealing area 31a between online 43 and 45, and line 33 be included in the top portion that a part between intersection point 36a and the 38a defines tab area 47 and sidewall 9, this tab area 47 defines lateral side flap 14.In addition, longitudinal broken line 42,43,44,45, transverse crease lines 33 and top cross sealing area 31a define other two zones 48,49, and zone 48,49 between zone 46,47, and defines corresponding top rake roof and rear-inclined roof 10,11 separately.

In each tab area 46, in 47, folding line pattern 37 also comprises paired inclined fold line 50,51 and 52,53, it originates in a 35a respectively, 37a and 36a, 38a, and link to each other with the 31c place respectively at a 31b along broken line 31, thereby with line 33 be included in a 35a respectively, 37a and 36a, the part between the 38a defines equicrural triangle together.

Line 50,51 and line 52,53 define the external world, side of lateral side flap 13,14 separately.

Three broken lines 54 that are used for tab area 46,55,56 and be used for three broken lines 57 of tab area 47,58,59 respectively from a 35a, 37a, 31b and some 36a, 38a, 31c extend on the mid point that is positioned at relevant equicrural triangle, and these mid points are represented by 60 and 61 respectively for tab area 46 and tab area 47.

Broken line 54,55 and broken line 57,58 extend symmetrically about the relative prolongation of broken line 56 and corresponding broken line 59 respectively.

The line 54,55 of tab area 46 at mid point 60 and corresponding some 35a, extends between the 37a, and upwards defines the top portion 20 of sidewall 8 respectively.Similarly, the line 57,58 of tab area 47 at mid point 61 and corresponding some 36a, extends between the 38a, and upwards defines the top portion 20 of sidewall 9 respectively.

In each tab area 46,47, folding line pattern 37 also comprises continuous broken broken line 65,66, promptly do not have open circuited dotted line, it is crossing with relevant broken line 50,52, and between relevant mid point 60,61 and the relevant intersection point of transverse crease lines 31, extend with longitudinal broken line 42,43.Specifically, the continuous broken broken line 65,66 of each bar is divided into two parts 67,68 by relevant broken line 50,52, and formation approaches but is not equal to 180 ° angle between them. Part 67,68 extends to transverse crease lines 31a from relevant broken line 50,52 respectively, and extends to relevant mid point 60,61 respectively.

Above-mentioned broken line in each tab area 46,47 defines a plurality of leg-of-mutton panel A, B, and C, D, E, F, G, as described in hereinafter, it is suitable for folding according to predetermined order.

Specifically, for tab area 46, panel A is limited by broken line 31,44 and 51; Panel B is limited by broken line 51,55 and 56; Panel C is limited by broken line 33,54 and 55, and defines the top portion 20 of sidewall 8; Panel D by the part 68 of broken line 56, broken line 65 and broken line 50 that part of qualification the between the broken line that is included in 65 and 31; Panel E by the part 68 of broken line 54, broken line 65 and broken line 50 that part of qualification the between the broken line that is included in 65 and the some 35a; Panel F by the part 67 of broken line 31, broken line 65 and broken line 50 that part of qualification the between the broken line that is included in 65 and the broken line 31; And panel G by the part 67 of broken line 42, broken line 65 and broken line 50 that part of qualification the between the broken line that is included in 65 and the some 35a.

Panel A, B, C, D, E, the method that F, the identical limiting mode of G can all fours and be applied to tab area 47 will not repeat to introduce at this, this is about the axis symmetry because of tab area 46 and 47, and this axis extends between longitudinal broken line 37,38 and be parallel with it.

During forming each tab area 46,47, panel E and B are folded on the panel C, and panel F overlaps on the panel G, and panel A has covered all remainders of tab area 46,47, so that limit relevant side roof 18,19.

According to an important aspect of the present invention, in each tab area 46,47 of material 2, folding line pattern 30 is designed to can be by making relevant panel A, B, C, D, E, F, (broken line is 50,51,54 to G for tab area 46 around its broken line separately as rigid body, 55,56,65, broken line then is 52 for tab area 47,53,57,58,59,66) rotate and formation side roof 18,19.

Stipulate that in this specification sheets and claim a little distortion that packing especially take place at the panel overlapping period because of its thickness do not got rid of in term " panel is as the rigid body rotation ".

More specifically say, by the following method, can obtain folding line pattern 30 in each tab area 46,47 of material 2:

-select the value of apex angle, apex angle is converged formation towards top cross sealing 12 along each side roof 18,19 of packing 1 between its opposed edges;

-be chosen in the length l of the top rake roof of measuring in a lateral direction 10 of top cross sealing 12; With

-determine each broken line 50,51,52,53,54,55,56,57,58,59,65,66 position and prolongations in each tab area 46,47, thereby by making relevant panel A, B, C, D, E, F, G forms each side roof 18,19 as rigid body around its corresponding described broken line rotation.

Because each side roof 18,19 is limited by the panel A of relevant tab area 46,47, so angle [alpha] is also formed by each broken line 44,45 and the appropriate section that is positioned at the interior broken line 31 in respective airfoil zone 46,47.

The applicant has been found that as described later, utilizes the simple geometric formula, and above-mentioned steps just can limit different folding line patterns in tab area 46,47, thereby makes chevron top portion 4 have different shapes.

For simplicity, following description partly will be only with reference to tab area 47 and Fig. 2 and Fig. 7, but identical description can be applied to tab area 46 with being equal to, and is not repeated in this description.

Specifically, by determining angle beta, can obtain the position and the prolongation of broken line 52,53, angle beta is by that part of formation between a 36a and the 38a of being included in of this line 52,53 and broken line 33.

Angle beta can calculate by the function of following formula as length l:

$\mathrm{\β}=\mathrm{arctg}\left(\frac{l}{c/2}\right)$

Wherein c refers to the width of packing 1, and it is given data, and is equivalent to the distance between broken line 36 and 38 or 35 and 37.

Angle beta allows and constructs broken line 52,53, and it originates in corresponding some 36a, 38a, and it is equilateral to define two of equicrural triangle, and the 3rd limit of this isoceles triangle shape is by that part of expression the between a 36a and the 38a of being included in of broken line 33.

By determining by line 57,58 and corresponding broken line 52,53 formed angle betas ₂, can obtain broken line 57,58, the position of 59 position and prolongation and mid point 61.

Angle beta ₂Can calculate by following formula:

${\mathrm{\β}}_2=\frac{\mathrm{\β}-({\mathrm{\θ}}_1-\mathrm{\θ})}{2}$

Wherein, θ refers to the angle of formation between each broken line 43,45 and corresponding broken line 52,53, and θ ₁Finger is finished the folding of chevron top portion 4 and after overlapping panel A on the panel C, by that part of formed angle between a 36a and the 38a of being included in of each broken line 43,45 and broken line 33.

More specifically say angle θ and θ ₁Can followingly calculate:

θ＝180°-α-β，

Consider that α also is the formed angle of appropriate section by each broken line 43,45 and broken line 33, and the appropriate section of broken line 33 is positioned at the outside of tab area 47, and originates in corresponding some 36a, 38a; So

${\mathrm{\θ}}_1=\arccos \left(\frac{c/2}{l_1}\right)$

L wherein ₁Refer to the length of broken line 43,45, and the function that can be used as length l and apex angle calculates by following formula:

$l_1=\frac{l}{\cos (90-\mathrm{\α})}$

Be used to calculate θ ₁Formula come from such consideration, promptly after chevron top portion 4 folds, broken line 45 defines hypotenuse of a right triangle, wherein straight-line pass extends to the line segment that broken line 33 is included in that part of mid point between a 36a and the 38a from the summit of side roof 9, and that part of half adjacent to hypotenuse of this broken line 33 determined.

Angle beta ₂Can construct broken line 57,58,59 and limit its intersection point 61.

Utilize angle beta ₂, θ, θ ₁Can calculate that part of formed angle beta between a 36a and the 38a of being included in by broken line 57,58 and broken line 33 ₁:

β ₁＝β ₂+(θ ₁-θ)。

Angle [alpha] and θ can design broken line 43 and 45.

By calculate by the part 67 of line 66 and broken line 31 that part of formed angle γ between the broken line that is included in 43 and 59, can determine the intersection point between broken line 52 and 66.

Specifically, angle γ is angle θ ₂Function, angle θ ₂Be after finishing the folding of chevron top portion 4 and overlapping panel A on all other panels, form by broken line 45 and broken line 43.

Angle γ can followingly calculate:

$\mathrm{\γ}=\frac{\mathrm{\α}-({\mathrm{\θ}}_2-\mathrm{\α})}{2}$

Angle θ wherein ₂Can obtain by following formula

${\mathrm{\θ}}_2=2\mathrm{arcsen}\left(\frac{c/2}{l_1}\right)$

Therefore, following formula can be used for calculating angle γ:

$\mathrm{\γ}=\frac{\mathrm{\α}-\left(2\mathrm{arcsen}(\frac{c/2}{l_1}-\mathrm{\α})\right)}{2}$

Know angle γ, so just can design the part 67 of broken line 66, and obtained the position of the intersection point between the broken line 52 and 66.By above-mentioned intersection point is linked to each other with mid point 61, just can obtain the part 68 of broken line 66.

Fig. 8 has shown another example of chevron roof packing, its collectivity mark is 1 ', and can obtain according to the value of the length l of said method by changing apex angle and inclination roof 10.

From the foregoing description, can know according to packing 1 of the present invention and 1 ' advantage.

Specifically, by giving the panel that makes package sheet material 2 A, B, C simply, D, E, F, G forms packing 1 as rigid body around its corresponding broken line rotation, 1 ' side roof 18,19 condition just can be distinguished the size and dimension of chevron top portion 4, guarantees the correct closure of the correct folding and packing of packing simultaneously.

In addition, because different piece (the panel A of packing 2 of packing 2, B, C, D, E, F, G) folding obtain by rotation, and therefore not have distortion of being correlated with and the stress that causes thus, so during forming step, just can not impair the integraty of the aluminium lamination more far short of what is expected than other packing timber bed of material flexibility.

Yet clearly, in the scope that does not break away from claims, can to described herein and shown in packing 1,1 ' change.

Specifically, should be appreciated that, packing 1,1 ' be included in edge 21,22 and can have any design shape with main portion 3 between the broken line 31,32.

In addition, in each tab area 46,47, the part 68 of broken line 65,66 can limit by the pair of parallel line at least in part, and this has the associated end that merges into single line towards relevant mid point 60,61 to parallel lines.Like this, in the zone of the part 68 of broken line 65,66, just reduced the distortion that packing produce because of the thickness of overlapping panel.

Claims (11)

1. chevron roof packing (1,1 ') that is used for pourable food, it is produced by folding and sealed package sheet material (2), and comprise chevron top portion (4), described chevron top portion (4) is included in top rake roof and the rear-inclined roof (10,11) that top cross sealing (12) is located to connect together, and it is a pair of with described top rake roof and rear-inclined roof (10,11) the side roof (18,19) that respective side edge (15,16) is connected together, each described side roof (18,19) by with the appropriate section (46,47) of package sheet material (2) along predetermined broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) fold up and obtain described broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) define a plurality of panels (A, B, C, D, E, F G), is characterized in that,

Among many possible broken lines of designing, determine described broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66), thus by make described panel (A, B, C, D, E, F, G) as rigid body around its corresponding broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) rotation, and form described side roof (18,19).

2. packing according to claim 1 is characterized in that, the value by selecting drift angle (α) at least and the value of length (l) obtain to be used to form the required broken line (31,33,42,44,50,51,54,55,56,65 of side roof (18,19); 31,33,43,45,52,53,57,58,59,66), described drift angle (α) is along each side roof (18,19) form between its opposite edges that meet at described top cross sealing (12), described length (l) is one of described top rake roof and rear-inclined roof (10,11) length along the horizontal direction of described top cross sealing (12).

3. packing according to claim 1 and 2, it is characterized in that, described packing obtains by tundish piece installing (26), described tundish piece installing (26) has cylindricality main portion (28) and at least one seals the convergent shape end portion (29) that (12) limit by described top cross, described end portion (29) defines described top rake roof and rear-inclined roof (10,11), and be provided with relative outstanding lateral side flap (13,14), described lateral side flap (13,14) be designed to be folded in beyond the used pack top volume of food, to obtain described side roof (18,19).

4. packing according to claim 3, it is characterized in that, each described lateral side flap (13,14) have adjacent to described top rake roof and rear-inclined roof (10,11) one side of roof (10), and by the associated ends part of described top cross sealing (12) (12a, 12b) formed and adjacent to the another side of another roof (11) of described top rake roof and rear-inclined roof (10,11).

5. the method for the size of a chevron roof packing (1,1 ') that is identified for pourable food, described packing (1,1 ') produce by folding and sealed package sheet material (2), described packing (1,1 ') comprises chevron top portion (4), described chevron top portion (4) is included in top rake roof and the rear-inclined roof (10,11) that top cross sealing (12) is located to be connected together, and a pair of with described top rake roof and rear-inclined roof (10,11) the side roof (18,19) that respective side edge (15,16) is connected together, each described side roof (18,19) by with the appropriate section (46,47) of package sheet material (2) along defining a plurality of panel (A, B, C, D, E, F, predetermined broken line (31,33 G), 42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) fold up and obtain, described method is characterized in that described method comprises determines described broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) the position and the step of prolongation, thus by make described panel (A, B, C, D, E, F is G) as rigid body and around its corresponding broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) rotation forms described side roof (18,19).

6. method according to claim 5 is characterized in that, determines described broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57, the described step of position 58,59,66) and prolongation is to carry out in selecting the step of the desirable value of drift angle (α) and length (l) at least, described drift angle (α) is along each side roof (18,19) form between its opposite edges that meet at described top cross sealing (12), described length (l) is one of described top rake roof and rear-inclined roof (10,11) length along the horizontal direction of described top cross sealing (12).

7. method according to claim 6 is characterized in that, determines described broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59, the described step of position 66) and prolongation comprises, is used to form in the expection of described package sheet material (2) in chevron top portion (4) that part of of packing (1,1 ') to carry out the design-calculated step, and described design content comprises:

First transverse crease lines (31) of the described top cross sealing of-qualification (12);

-the second transverse crease lines (33), it forms the level angle of described chevron top portion (4), and is positioned at from described first transverse crease lines (31) a distance, and described distance equals described selected length (l);

-many longitudinal broken lines (42,43,44,45), itself and described first transverse crease lines and second transverse crease lines (31,33) define a pair of first area (46 together; 47) and a pair of second area (48; 49), described a pair of first area (46; 47) define described side roof (18,19), described a pair of second area (48; 49) define described top rake roof and rear-inclined roof (10; 11), described longitudinal broken line (42,43,44,45) forms and makes the appropriate section of described second transverse crease lines (33) be positioned at the outside of described first area (46,47), forms and described selected drift angle (α) angle same; With

-many inner broken lines (50,51,54,55,56,65; 52,53,57,58,59,66), it is positioned at each described first area (46; 47) in, and its orientation be by in chevron top portion (4) forming process, considered the gained panel (A, B, C, D, E, F G) must be as rigid body rotation and the geometric relationship that obtains is determined.

8. method according to claim 7 is characterized in that, for each described first area (46; 47), described inner broken line is included in that described first transverse crease lines (31) is located to link to each other and defines double-type first inclined fold line (50,51 of equicrural triangle with described second transverse crease lines (33); 52,53), described method is characterized in that, designs each first area (46; The described step of the described inner broken line 47) comprises the step of calculating angle (β) by following formula, and described angle (β) is by each bar first inclined fold line (50,51; 52,53) with the described equicrural triangle of defining of described second transverse crease lines (33) that part of formation on one side:

$\mathrm{\β}=\mathrm{arctg}\left(\frac{l}{c/2}\right)$

Wherein, c refers to the width of packing to be formed.

9. method according to claim 8 is characterized in that, for each described first area (46; 47), described inner broken line comprises three second inclined fold line (54,55,56; 57,58,59), its mid point (60 from being positioned at described equicrural triangle; 61) extend to its corresponding summit, described method is characterized in that the described step that designs described inner broken line comprises by following formula calculates angle (β ₂) step, described angle (β ₂) by described second inclined fold line (54,55,56; 57,58,59) and corresponding described first inclined fold line (50,51; 52,53) form:

${\mathrm{\β}}_2=\frac{\mathrm{\β}-({\mathrm{\θ}}_1-\mathrm{\θ})}{2}$

Wherein, θ refers to the angle that forms between each bar longitudinal broken line (42,43,44,45) and adjacent first inclined fold line (50,51,52,53), and θ ₁Finger after finishing chevron top portion (4) folding, each bar longitudinal broken line (42,43,44,45) and the described equicrural triangle of defining of described second transverse crease lines (33) that part of formed angle on one side.

10. method according to claim 9 is characterized in that, for each described first area (46; 47), described inner broken line comprises the 3rd inclined fold line (65; 66), it is from described mid point (60; 61) extend to described first transverse crease lines (31), with described first inclined fold line (50,51; 52,53) wherein broken line (50; 52) intersect, and by described wherein one first broken line (50; 52) be divided into first and second portion (67,68), described first and second portion (67,68) formed between and be not equal to 180 ° angle, and lay respectively at the outside and inner of described equicrural triangle, described method is characterized in that the described step that designs described inner broken line comprises the step of calculating angle (γ) by following formula, and described angle (γ) is by described the 3rd inclined fold line (65; 66) described first (67) and described first transverse crease lines (31) be positioned at each described first area (46; 47) Nei that part of formation:

$\mathrm{\γ}=\frac{\mathrm{\α}-(2\mathrm{arcsen}\left(\frac{c/2}{l_1}\right)-\mathrm{\α})}{2}$

Wherein, l ₁The length that refers to longitudinal broken line (42,43,44,45).

11. a package sheet material (2), it is suitable for along predetermined broken line (31,33,42,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) fold and seal, so that produce the chevron roof packing (1,1 ') that is used for pourable food, it is characterized in that, determine described broken line (31,33,42 according to the described method of arbitrary claim in the claim 5 to 10,44,50,51,54,55,56,65; 31,33,43,45,52,53,57,58,59,66) size.

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