CN101670684B

CN101670684B - Manufacturing process of packaging bag

Info

Publication number: CN101670684B
Application number: CN2009101926016A
Authority: CN
Inventors: 张列荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-19
Filing date: 2009-09-19
Publication date: 2011-03-23
Anticipated expiration: 2029-09-19
Also published as: CN101670684A

Abstract

The invention discloses a manufacturing process of a foldable flexible packaging bag which is provided with a flat bottom and a side wall; the manufacturing process has the characteristics that: front and back surfaces and left and right side surfaces of a bag body are processed by sheets, the left and right side surfaces are internally folded along middle, so as to form a state with four layers at two sides and two layers in the middle; next, the bag body is expanded from inner part, the front sheet is turned over forwards and the back sheet is turned over backwards at one end of the bag body, the turning-over length is half of the width of left and right side surfaces; meanwhile, the left and right side surfaces are driven to turn over outwards, so as to form a shape with an opening in middle, lifted inner side surfaces of four side edges and expanding body from bottom to up; the sheets at the bag bottom are protruded from the middle part from top to bottom and front and back parts thereof are tilted up upwards, and two sides of an inner surface of the bag bottom sheet are tilted upwards, and the whole body is in a shape which is shrank from up to down; finally, the bag bottom sheet and the bag body are matched and combined. The manufacturing process has the advantages of high yield and simple following procedures.

Description

A kind of manufacture craft of packaging bag

Technical field

The invention belongs to a kind of manufacture method of packaging bag, relate to a kind of making, refer to a kind of manufacture craft flat, folding flexible bags that has especially with flexible bags of sidewall.

Background technology

In the manufacture craft of existing flexible bags, superimposed and two sides, two sides inwardly were converted into four folded bag bodies before and after existing employing was formed in earlier along the centre, dig by facing down before the portion of bag body end again and two sides each dig to the left and right and be folded on the back, and end, back portion is also exposed up, make the last portion in four sides all be positioned at same plane, be compounded in unlimited by bag egative film material then, each face dig or the inner surface that exposes on production method, by the finished product packing bag that this manufacture craft obtains, be rugosity at the bottom of having bag, that expose and flat is characteristics such as a sheet.

But, there is the pressure to sealing in this manufacture craft, the problem that technical factors such as the time control that temperature of sealing and envelope are pressed is had relatively high expectations, for example, when big slightly or envelope pressure time of high slightly or pressure was long slightly when temperature, because a bag body end portion digs, part was to be folded on bag body front again at last, therefore, cause that easily bag inboard of body front-back locates to merge below folding, the front-back of bag body is sticked together, bag is damaged and reduces yield rate.

In addition, also exist must be to the bag end of exposing, the complicated technology problem that clout is repaired around it for this manufacture craft.At first, because the packaging bag after the moulding, a long limit of its bag egative film material is also superimposed on bag body front, its pruning is needed to grow the limit lift, thereby be difficult to realize automation, have to adopt artificial cut operation mode, and operating, it is also time-consuming both to require great effort.Secondly, even more important, the finishing of bag end dual-side will more bother, because bag end dual-side is superimposed together with bag body both sides, and concordant substantially, therefore, also be difficult to by automation to bag at the bottom of dual-side prune, often again need be perfect by manually pruning, could satisfy commodity requirement attractive in appearance, operate and spended time and skill.

Summary of the invention

The object of the present invention is to provide a kind of making to have two sides, and the bottom is the technology of the flat Foldable package bag of a sheet, this manufacture craft has the yield rate height and later process is handled characteristic of simple.

Its purpose is realized by following scheme:

A kind of manufacture craft of packaging bag at first is processed into the bag body that is made of two sides, front and back and left and right sides face with flexible sheet material, and is again that left and right sides face is inwardly folding along medium line, becomes to be both sides four folded middle two states of folding; Then, the bag body is opened internally, and in an end of bag body, the sheet material of front is turned down forward, the sheet material of back turns down backward, its length of sheet material of turnover just is half of left and right side width, simultaneously, driving that face terminal inflexed part in the left and right sides also is positioned at apart from length along the side medium line separately is that the line on the summit of the point at half place of width, left and right side and corner, side outwards turns down, see from top to bottom, the outline and the fold line of bag body have constituted following form: this form has the opening of a strip in the centre, the end of front and back is exposed to outside turnover part and all is rendered as an isosceles trapezoid, the inflexed part of left and right side end is exposed to outside turnover part and all is rendered as two triangle intersect together, and integral body has the form that enlarges from bottom to top; Then, get length and bag height degree, the bag egative film material that width is consistent with bag body width, in the middle of bag egative film material, press a horizontal scrimp, and inner surface is got length equal bag height degree outstanding downwards and inner surface front and rear part is inclined upwardly and turns up with a bag body width difference in the middle part of horizontal scrimp, simultaneously, the left and right sides of bag egative film material inner surface respectively transversely the line on the end points of scrimp middle part and summit, corner, the left and right sides also upwards turn up, see from the bottom up, the outline and the fold line of bag egative film material have constituted following form: the part of upwards turning up before and after the inner surface all is rendered as an isosceles trapezoid, the part that upwards turn up the inner surface left and right sides all is rendered as two triangle intersect together, and integral body has the form of dwindling from top to bottom; At last, carry out heat seal by the edge of above-mentioned bag egative film material inner surface and the inner surface at edge, above-mentioned bag body four sides.

Be more preferably, in the such scheme, after bag egative film material and bag body are compound, in the middle of the turnover of front and back end part pressed to respectively, can make face terminal each diabolo with bag egative film material both sides in the left and right sides all be folded and be built between the end of front and back and integral body is carried out mold pressing finalize the design along its intersecting lens.This not only helps saving storage or transportation space, and is prior, gets ready for further handling simultaneously.

Be more preferably, in the such scheme, a heat seal carried out on the base of packaging bag end again.Can when carrying out the mold pressing typing, integral body carry out.This can make by the edge of bag egative film material inner surface and bag at one's side the inner surface on edge combine better.

Be more preferably, in the such scheme, carry out disposable clout in the base of packaging bag end along same straight line and cut the limit finishing.Like this, can make the end of two sides, front and back and left and right sides face all obtain simultaneously pruning.

The manufacture craft of thus obtained packaging bag, owing to adopt the mode of the direct pressing in edge, thereby can not exist simultaneously the problem of other position Hybrid Heating, can fundamentally stop the inboard coherent problem of bag body, thereby help improving the yield rate of product.

The packaging bag that obtains of manufacture craft thus, because compound tense, the bag body is open-shaped and bag is contraction-like in an end, thereby involved being folded in bag body at the bottom of the moulding back pkt., the bag end of this internal, make face each diabolo terminal and bag egative film material both sides in the left and right sides all be folded and be hidden between the end of front and back along its intersecting lens, this helps taking advantage of a situation in operation subsequently according to this general layout, the end of front and back is pressed to middle then practicable typing, not only can be packaging bag and store or transport and provide convenience, importantly, also owing to need not fold then again and can operate, its typing is simple to operate, also helps the mechanical automation of later process.

Thus obtained typing packaging bag, the distal edge at four sides, the bag end is along the end that all is folded in the typing packaging bag, therefore, not only can carry out heat seal to each limit again, and clout also can solve with the excision mode of imposing uniformity without examining individual cases around the base, promptly once shear in the upper and lower surface heating of the base of typing packaging bag end or on the base of typing packaging bag end, just can carry out heat seal and finishing to the surrounding edge edge simultaneously, this will simplify the processing of later process greatly, obviously, also help satisfying the requirement of mechanical automation.

Description of drawings

Fig. 1 is the schematic diagram of bag body of the present invention moulding;

Fig. 2 is that Fig. 1 bag body is converted into the bottom and is rendered as uncovered and a bag egative film material is converted into the schematic diagram that is rendered as outstanding process;

Fig. 3 is the uncovered schematic diagram that the ledge of Fig. 2 bag egative film material is compounded in Fig. 2 bag body;

Fig. 4 be Fig. 3 packaging bag after mold pressing by the schematic diagram of heat seal once more and disposable excision clout.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described in detail:

Referring to Fig. 1-Fig. 4, the manufacture craft of this packaging bag, adopt following step:

With reference to Fig. 1, at first, adopt flexible material to be processed into to have front 1, the bag body of back 2 and left surface 3 and right flank 4 opening that is square in the middle of the bag body; Secondly, again that left surface 3, right flank 4 is inwardly folding in the middle of separately along it respectively, respectively become a broken line in the middle of it and be 31 and 41 inflexed part, the inflexed part is the V-shape shape.

With reference to Fig. 2, then, by the opening and closing device from bag body inside, with the end of front 1 and back 2 each forwards, backwards direction open an angle, just half of left surface 3 or right flank 4 width by its length of end of open front 1 and back 2, simultaneously, drive the inflexed part 32 of left surface 3 and right flank 4 ends, 42 each to be positioned at apart from length along the side medium line be some d or the summit e of c and corner, side and the line of g or f and h at half place of width, left and right side, it is angle of de and dg or cf and ch direction upset to the left and right, at this moment, see from top to bottom, the outline and the fold line of bag body have constituted following form: this form has the opening of a strip in the centre, the end of front 1 and back 2 is exposed to outside flip portion and all is rendered as an isosceles trapezoid A, the inflexed part 32 of left surface 3 and right flank 4 ends, 42 flip portion that are exposed to the outside all are rendered as two triangle B and intersect together, intersection ad that two triangle B intersect and bc are and project upwards, isosceles trapezoid A and triangle B all constitute with bag plane, place, body bottom, and integral body has the form that enlarges from bottom to top; Moreover, make bag egative film material form a horizontal scrimp a1d1c1b1 from the centre by mould, and inner surface is got length in the middle part of horizontal scrimp d1c1 equal bag height degree outstanding downwards and inner surface front and rear part is inclined upwardly and turns up with a bag body width difference, simultaneously, the left side of bag egative film material inner surface is the end points d1 and corner, the left side summit e1 of scrimp middle part transversely, g1 upwards turns up, the right side of bag egative film material inner surface is the end points c1 and the right edge angular vertex f1 of scrimp middle part transversely, h1 upwards turns up, at this moment, see from the bottom up, the outline and the fold line of bag egative film material have constituted following form: acclivitous part all is rendered as an isosceles trapezoid A1 before and after the inner surface, the part that upwards turn up the inner surface left and right sides all is rendered as two triangle B1 and intersects together, two crossing intersection a1d1 and b1c1 of triangle B1 project upwards, isosceles trapezoid A1 and triangle B1 all constitute with the plane of passing through horizontal scrimp a1d1c1b1 place, and integral body has the form of dwindling from top to bottom.

Like this, the uncovered form that the bag figure has become a centre to be started for the inner surface at edge, open-type four sides, and a bag egative film material inner surface has formed an inner surface surrounding and middlely has been outstanding form along exposing, and bag shape of egative film material can be coincide with the uncovered shape of bag body.

With reference to Fig. 3, then, carry out heat seal by the inner surface edge of above-mentioned bag egative film material and the inner surface at edge, above-mentioned bag body four sides.

With reference to Fig. 4, then, opening and closing device closure also withdraws from, the flange of front 1 and back 2 ends is pressed to middle respectively, the one-tenth diabolo B that makes left and right sides face end that takes advantage of a situation is folded along intersecting lens ad and bc, the one-tenth diabolo B1 of bag egative film material both sides is folded along intersecting lens a1d1 and b1c1, and these triangles also are built between the end of front and back; Then, carry out a heat seal again, and integral body is carried out the mold pressing typing in the base of end; At last, carry out the disposable limit finishing of cutting in the base of typing packaging bag end along same straight line.At this moment, because the end of two sides, front and back and left and right sides face all is positioned at the end of packaging bag, therefore, the disposable limit of cutting just can make them all obtain pruning, so obtained neat packaging bag.

Claims

1. the manufacture craft of a packaging bag comprises at first and is processed into the bag body that is made of two sides, front and back and left and right sides face with flexible sheet material, and is again that left and right sides face is inwardly folding along medium line, becomes to be both sides four folded middle two states of folding; It is characterized in that, then, the bag body is opened internally, and in an end of bag body, the sheet material of front is turned down forward, the sheet material of back turns down backward, its length of sheet material of turnover just is half of left and right side width, simultaneously, driving that face terminal inflexed part in the left and right sides also is positioned at apart from length along the side medium line separately is that the line on the summit of the point at half place of width, left and right side and corner, side outwards turns down, see from top to bottom, the outline and the fold line of bag body have constituted following form: this form has the opening of a strip in the centre, the end of front and back is exposed to outside turnover part and all is rendered as an isosceles trapezoid, the inflexed part of left and right side end is exposed to outside turnover part and all is rendered as two triangle intersect together, and integral body has the form that enlarges from bottom to top; Then, get length and bag height degree, the bag egative film material that width is consistent with bag body width, in the middle of bag egative film material, press a horizontal scrimp, and inner surface is got length equal bag height degree outstanding downwards and inner surface front and rear part is inclined upwardly and turns up with a bag body width difference in the middle part of horizontal scrimp, simultaneously, the left and right sides of bag egative film material inner surface respectively transversely the line on the end points of scrimp middle part and summit, corner, the left and right sides also upwards turn up, see from the bottom up, the outline and the fold line of bag egative film material have constituted following form: the part of upwards turning up before and after the inner surface all is rendered as an isosceles trapezoid, the part that upwards turn up the inner surface left and right sides all is rendered as two triangle intersect together, and integral body has the form of dwindling from top to bottom; At last, carry out heat seal by the edge of above-mentioned bag egative film material inner surface and the inner surface at edge, above-mentioned bag body four sides.

2. according to the manufacture craft of the packaging bag of claim 1, it is characterized in that, the whole bag that the compound back of bag egative film material and bag body constitutes, in the middle of the turnover part of its front and back end is pressed to respectively, make face each diabolo terminal and bag egative film material both sides in the whole bag left and right sides all be folded and be built between the end of whole bag front, back, and whole bag integral body is carried out the mold pressing typing along its intersecting lens.

3. according to the manufacture craft of the packaging bag of claim 1 or 2, it is characterized in that, a heat seal is carried out on the base of packaging bag end again.

4. according to the manufacture craft of the packaging bag of claim 1 or 2, it is characterized in that, carry out disposable clout in the base of packaging bag end along same straight line and cut the limit finishing.

5. according to the manufacture craft of the packaging bag of claim 3, it is characterized in that, carry out disposable clout in the base of packaging bag end along same straight line and cut the limit finishing.