EP0222184B1 - Stitched valve bag and procedure for making same - Google Patents
Stitched valve bag and procedure for making same Download PDFInfo
- Publication number
- EP0222184B1 EP0222184B1 EP86114154A EP86114154A EP0222184B1 EP 0222184 B1 EP0222184 B1 EP 0222184B1 EP 86114154 A EP86114154 A EP 86114154A EP 86114154 A EP86114154 A EP 86114154A EP 0222184 B1 EP0222184 B1 EP 0222184B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bag
- mantle
- incision
- valve
- end margin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/14—Valve bags, i.e. with valves for filling
- B65D31/142—Valve bags, i.e. with valves for filling the filling port being formed by folding a flap connected to a side, e.g. block bottoms
Definitions
- the invention concerns a stitched valve bag and a procedure for manufacturing stitched valve bags as described in the precharacterizing part of claim 1 and claim 2 respectively.
- the bag made as taught by the invention is intended to be used as a so-called cement bag or equivalent.
- the part of the tubular blank beyond the incision is removed in connection with the cut-off operation. Folding of the valve member or the corner of the valve opening is then performed, whereafter the valve end and bottom of the bag may be stitched closed.
- valve bag manufactured by a procedure of prior art is formed in that the paper web is run in tubular form of desired dimensions, the bag blank in tubular form comprising a mantle part with both ends open. Next, one open end of the tubular bag blank can be stitched closed, and folding of the valve opening corner can be performed on the other end of the bag blank. It is thus understood that no incision in the machine direction for forming the valve on the bag is associated with this manufacturing method. When the corner of the valve opening has been folded, the valve end of the bag can be stitched closed. The drawback of a bag made by this procedure is that the valve will be short and therefore the bag does not close properly.
- the object of the invention is to provide a stitched valve bag which has greater strength and better tightness at its valve end and to teach a procedure by which a bag of said kind is manufactured without involving any extra work steps in the procedure and which enables the length of the valve member on the valve bag to be adjusted in a simple manner.
- the bag of the invention is easy to manufacture by mechanical means.
- the procedure of the invention is even simpler than previous procedures because no piece of material has to be removed from the bag blank. As a result, savings in economy are also achieved since the material can be more completely utilized.
- the bag manufactured by the procedure of the invention has greater strength than those of prior art because the material of the bag's valve end, which used to be discarded, is now made use of towards improving the strength of the bag's valve end. Since the stitched seam of the valve end will have good strength, the bag can be made using even one single material course (several courses may naturally equally be used).
- the inner course is for instance paper
- the outer, so-called reinforcing material is for instance a course woven of some plastic material.
- the valve bag of prior art (FR-A 971 464, Figs. 10-14), presented in Fig. 1A, has been generally denoted with reference numeral 10.
- Reference numerals equivalent to those in Fig. 1A are used in Figs 1B, 2A and 2B.
- the valve bag 10 comprises a mantle part 11 x, an upper end margin 12 and a lower end margin 13. In one corner of the upper end margin 12 of the bag 10 has been formed a valve member 14.
- Fig. I A the bag 10 is shown in the stage where it has already been cut, but the valve member 14 has not been folded.
- Fig. 1B the valve member 14 is shown, folded along the folding lines 15.
- the folds of the valve bag 10 carry the reference numeral 17.
- the mantle part 11 of such a bag 10 of prior art usually consists of a plurality of material thicknesses, e.g. of the triple material thickness.
- the bag 10 of prior art, described above, can be made on a material web e.g. in two ways, as depect- ed in Figs 2A and 2B.
- the bag 10 may be made in that the full-with paper web is run to tubular shape of desired dimension, by cutting the web along the dotted lines indicated with reference numeral 13a, and which go to form the lower end margin 13 of the bag 10.
- an incision 16 running in the machine direction, i.e., parallel to the mantle part 11 is made at one end margin of the bag blank, this incision extending up to the transversal line 12a, marked with a dotted line, and this forming the upper end margin 12 of the bag 10.
- the waste piece 19 is smaller of its size than in the procedure of Fig. 2A, but implementation of the procedure of Fig. 2B is more difficult.
- the paper web may be cross-cut, for forming the bag 10, only at one end of the bag 10 with a transversal cut 13b. It is thus understood that this cut 13b will produce, on the material web, the lower parts 13 of two consecutive bags.
- the upper parts 12 of two consecutive bags face each other and therefore the cut 12b cannot be carried at one go right across the material web.
- FIG. 3A and 3B Another valve bag of prior art (FR-A 971 464, Figs. 1-8), depicted in Figs. 3A and 3B, has been generally denoted with reference numeral 20.
- the bag 20 comprises a mantle part 21, an upper end margin 22 and a lower end margin, not depicted in the figure.
- the folds of the bag 20 carry the reference numeral 27.
- a valve member 24 is formed in one corner of the upper end margin 22 by folding one corner along the folding lines 25, whereafter the bag 20 is ready for being stitched.
- Fig. 3B has been indicated the stitched seam 28, and a similar stitched seam is of course also provided in the lower end margin of the bag 20.
- the bag 20 according to Figs.
- the bag 20 is manufactured by cutting the material web to tubular lengths of desired dimension, whereby the bag blank in tubular form comprises a mantle part 21 with both ends open.
- a valve member 24 In the upper end margin 22 of the bag is formed a valve member 24 by folding one upper corner of the bag along the folding lines 25, whereupon the upper end margin 22 of the bag is stitched closed with the stitched seam 28, and the lower end margin with a similar seam. The bag is then fully completed.
- 3A-3B could likewise be anchored in similar manner, but this too would require the use of a longer blank. Moreover, making the fold would be exceedingly difficult in practice when a bag as in Figs 1A-2B and 3A-3B is made of a plurality of material courses.
- Figs. 4A-4C is presented the manufacturing of the valve end of a bag 30 according to the invention
- Fig. 5 illustrates the way in which the bag blank is taken from the material web.
- the material web has been run in tubular form and it has been cross-cut to given dimensions along the lines 32a and 33a.
- a longitudinal incision 36 for the valve blank 34 in the upper end margin 32 of the bag blank in the machine direction, i.e., longitudinal to the mantle part 31 of the blank.
- the bag 30 of said figures comprises a mantle part 31, a lower end margin, or bottom end margin not depicted in these figures, and an upper end margin 32.
- an incision 36 in the machine direction for the valve blank 34 has been made, in the way just described, an incision 36 in the machine direction for the valve blank 34.
- the folds of the bag 30 carry the reference numeral 37. Said incision in the machine direction, 36, has been carried up to the folding line 39 of the valve end, which corresponds to the upper end margin 12 of the bag 19 shown in Fig. 1A. Different from the bag shown in Fig.
- the bag blank is not cut along the folding line 39 in the design of the invention; instead, the upper end margin 32 of the bag is folded along said line 39 in order to reinforce the valve end of the bag 30.
- the valve blank is folded, to become a valve member 34', along the folding lines 35, and thereby the forming of the valve member 34' is completed.
- the above-mentioned folding of the upper end margin 32 of the bag 30 along the folding line 39 is carried out, as shown in Fig. 4C.
- the valve end of the bag 30 and its lower end margin 33 are then stitched closed with stitched seams 38.
- valve end of the bag 30 of the invention can thus be anchored in the way just described, by folding double the upper end margin 32 of the bag 30. Through this, the strength of the valve end of the bag 30 is substantially improved, so that the bag 30 may even be made using one single material course if this should be required.
- the bag When using several material courses, the bag may be manufactured either of paper or equivalent altogether, or by using, one of the courses at least, various reinforcing materials, e.g. woven fabric material or equivalent.
- the reinforcing material has to be of a kind which endows the bag 30 with adequate strength, and the reinforcing material may moreover be treated in a way preventing moisture penetration, in which case it will also constitute a moisture protection for the bag 30.
- the woven fabric material cannot become unravelled in the vicinity of the stitched seam 38 at the valve end of the bag because the upper end margin 32 of the bag has been folded double. It is obvious, of course, that the lower end margin 33 of the bag may equally be folded double in like manner, although in that case a longer bag blank will be needed.
- the invention is not critial as regards the succession in which cross-cutting, incision, valve folding and stitching of upper and lower part are performed.
Abstract
Description
- The invention concerns a stitched valve bag and a procedure for manufacturing stitched valve bags as described in the precharacterizing part of claim 1 and claim 2 respectively. The bag made as taught by the invention is intended to be used as a so-called cement bag or equivalent.
- Bags of the kind described above, paper bags in particular (see FR-A 971 464, Fig. 10-14; GB-A 1 588 042), have previously been manufactured. The part of the tubular blank beyond the incision is removed in connection with the cut-off operation. Folding of the valve member or the corner of the valve opening is then performed, whereafter the valve end and bottom of the bag may be stitched closed.
- This procedure of prior art, and the bag manufactured according to this procedure, is embarrassed by a number of drawbacks. It is a significant drawback that in the manufacturing of the bag wasted pieces are cut off and have to be discarded the removal of which is often difficult in practice and which cannot be utilized in any way whatsoever: being waste material, they have to be thrown away. Furthermore, the stitched seam on the side of the bag's valve end detracts from the strength of the bag because the material in the vicinity of the seam has not been "anchored" in any way. Moreover, a bag of this kind, when subjected to stress, tends to fail at the valve-end stitches and the material in the bag will then escape through the stitched seam.
- Another valve bag manufactured by a procedure of prior art (see FR-A 971 464, Fig. 1-2) is formed in that the paper web is run in tubular form of desired dimensions, the bag blank in tubular form comprising a mantle part with both ends open. Next, one open end of the tubular bag blank can be stitched closed, and folding of the valve opening corner can be performed on the other end of the bag blank. It is thus understood that no incision in the machine direction for forming the valve on the bag is associated with this manufacturing method. When the corner of the valve opening has been folded, the valve end of the bag can be stitched closed. The drawback of a bag made by this procedure is that the valve will be short and therefore the bag does not close properly.
- The object of the invention is to provide a stitched valve bag which has greater strength and better tightness at its valve end and to teach a procedure by which a bag of said kind is manufactured without involving any extra work steps in the procedure and which enables the length of the valve member on the valve bag to be adjusted in a simple manner.
- This object is achieved by the characterizing part of claim 1 and claim 2 respectively.
- With the procedure of the invention and with a bag manufactured according to the procedure several advantages over designs of prior art are achieved, of which for instance the following may be held forth. The bag of the invention is easy to manufacture by mechanical means. The procedure of the invention is even simpler than previous procedures because no piece of material has to be removed from the bag blank. As a result, savings in economy are also achieved since the material can be more completely utilized. The bag manufactured by the procedure of the invention has greater strength than those of prior art because the material of the bag's valve end, which used to be discarded, is now made use of towards improving the strength of the bag's valve end. Since the stitched seam of the valve end will have good strength, the bag can be made using even one single material course (several courses may naturally equally be used). When two material courses are used, the inner course is for instance paper, and the outer, so-called reinforcing material is for instance a course woven of some plastic material. Furthermore, it is possible by changing th length of the valve to produce by the procedure of the invention a bag with better tightness than by any method of prior art.
- The invention is described in detail in the following, referring to some advantageous embodiments of the invention, presented in the figures of the attached drawing, but to which the invention is not meant to be exclusively confined.
- Figs. 1A and 1B present, as seen from above, a paper bag of prior art.
- Figs. 2A and 2B present, as seen from above, two alternative embodiments of the material web associated with the manufacturing of the bag depicted in Figs. 1 A and 1 B.
- Figs. 3A and 3B present, as seen from above, another bag of prior art.
- Fig. 4A presents, as seen from above, the valve end of a bag according to the invention, prior to folding the corner of the valve member.
- Fig. 4B presents, as seen from above, the valve end of a bag according to the invention, with the corner of the valve member folded.
- Fig. 4C presents, as seen from above, the valve end of a bag according to the invention, fully stitched.
- Fig. 5 presents, as seen from above, the material web of which the bag of the invention is made.
- The valve bag of prior art, (FR-A 971 464, Figs. 10-14), presented in Fig. 1A, has been generally denoted with
reference numeral 10. Reference numerals equivalent to those in Fig. 1A are used in Figs 1B, 2A and 2B. Thevalve bag 10 comprises a mantle part 11 x, anupper end margin 12 and alower end margin 13. In one corner of theupper end margin 12 of thebag 10 has been formed avalve member 14. In Fig. I A, thebag 10 is shown in the stage where it has already been cut, but thevalve member 14 has not been folded. In Fig. 1B thevalve member 14 is shown, folded along thefolding lines 15. The folds of thevalve bag 10 carry thereference numeral 17. In Fig. 1B has also been indicated, with interrupted lines, thestitches seam 18, with which the upper end x that in its flattened state provides two opposed mantle sides confined between two side margins andmargin 12 of the bag is stitched closed after thevalve member 14 has been folded. Of course, a similar stitchedseam 18 is also applied in the lower end margin of the bag. Themantle part 11 of such abag 10 of prior art usually consists of a plurality of material thicknesses, e.g. of the triple material thickness. - The
bag 10 of prior art, described above, can be made on a material web e.g. in two ways, as depect- ed in Figs 2A and 2B. As shown in Fig. 2A, thebag 10 may be made in that the full-with paper web is run to tubular shape of desired dimension, by cutting the web along the dotted lines indicated withreference numeral 13a, and which go to form thelower end margin 13 of thebag 10. Next, in order to form thevalve member 14, anincision 16 running in the machine direction, i.e., parallel to themantle part 11, is made at one end margin of the bag blank, this incision extending up to thetransversal line 12a, marked with a dotted line, and this forming theupper end margin 12 of thebag 10. Along saidline 12a is thereafter made a cross-cut, whereby thewaste piece 19 is removed from the bag blank. Thevalve member 14 is then folded along thefolding lines 15, and bothend margin seam 18. In practice, thecuts - In the manufacturing mode of Fig. 2B, the
waste piece 19 is smaller of its size than in the procedure of Fig. 2A, but implementation of the procedure of Fig. 2B is more difficult. In the procedure of Fig. 2B, the paper web may be cross-cut, for forming thebag 10, only at one end of thebag 10 with atransversal cut 13b. It is thus understood that thiscut 13b will produce, on the material web, thelower parts 13 of two consecutive bags. On a material web as shown in Fig. 2B, theupper parts 12 of two consecutive bags face each other and therefore thecut 12b cannot be carried at one go right across the material web. - Another valve bag of prior art (FR-A 971 464, Figs. 1-8), depicted in Figs. 3A and 3B, has been generally denoted with
reference numeral 20. Thebag 20 comprises amantle part 21, anupper end margin 22 and a lower end margin, not depicted in the figure. The folds of thebag 20 carry thereference numeral 27. Avalve member 24 is formed in one corner of theupper end margin 22 by folding one corner along thefolding lines 25, whereafter thebag 20 is ready for being stitched. In Fig. 3B has been indicated the stitched seam 28, and a similar stitched seam is of course also provided in the lower end margin of thebag 20. Thebag 20 according to Figs. 3A and 3B is rather much simpler to manufacture than thebag 10 of Figs 1A-2B. Thebag 20 according to this embodiment is manufactured by cutting the material web to tubular lengths of desired dimension, whereby the bag blank in tubular form comprises amantle part 21 with both ends open. In theupper end margin 22 of the bag is formed avalve member 24 by folding one upper corner of the bag along thefolding lines 25, whereupon theupper end margin 22 of the bag is stitched closed with the stitched seam 28, and the lower end margin with a similar seam. The bag is then fully completed. - With the bags of prior art described in the foregoing is associated the drawback that the material lying in the vicinity of the stitched
seam 18, 28 in theupper end margin bag seam 18, 28, whereby the material in the bas escapes through the seam. Of course, thebag 10 of Figs 1A-2B could be anchored by folding double theupper end margin 12 before stitching the valve end of the bag and performing the stitching only thereafter. The blank for thebag 10 formed in this manner would, however, have to be longer than that of Figs 1A-2B by the length of the folded part, with the result of greater material waste and even higher manufacturing costs. Thebag 20 of Figs. 3A-3B could likewise be anchored in similar manner, but this too would require the use of a longer blank. Moreover, making the fold would be exceedingly difficult in practice when a bag as in Figs 1A-2B and 3A-3B is made of a plurality of material courses. - In Figs. 4A-4C is presented the manufacturing of the valve end of a
bag 30 according to the invention, and Fig. 5 illustrates the way in which the bag blank is taken from the material web. As can be seen in Fig. 5, the material web has been run in tubular form and it has been cross-cut to given dimensions along thelines 32a and 33a. In this same connection is made alongitudinal incision 36 for the valve blank 34 in theupper end margin 32 of the bag blank, in the machine direction, i.e., longitudinal to themantle part 31 of the blank. - Forming the valve member 34' of the
bag 30 and "anchoring" the valve end is effected in the way depicted in Figs 4A-4C. Thebag 30 of said figures comprises amantle part 31, a lower end margin, or bottom end margin not depicted in these figures, and anupper end margin 32. In theupper end margin 32 has been made, in the way just described, anincision 36 in the machine direction for thevalve blank 34. The folds of thebag 30 carry thereference numeral 37. Said incision in the machine direction, 36, has been carried up to thefolding line 39 of the valve end, which corresponds to theupper end margin 12 of thebag 19 shown in Fig. 1A. Different from the bag shown in Fig. 1 A, the bag blank is not cut along thefolding line 39 in the design of the invention; instead, theupper end margin 32 of the bag is folded along saidline 39 in order to reinforce the valve end of thebag 30. As can be seen in Fig. 4B, the valve blank is folded, to become a valve member 34', along thefolding lines 35, and thereby the forming of the valve member 34' is completed. When the valve member 34' has been fully folded, the above-mentioned folding of theupper end margin 32 of thebag 30 along thefolding line 39 is carried out, as shown in Fig. 4C. The valve end of thebag 30 and itslower end margin 33 are then stitched closed with stitchedseams 38. - The valve end of the
bag 30 of the invention can thus be anchored in the way just described, by folding double theupper end margin 32 of thebag 30. Through this, the strength of the valve end of thebag 30 is substantially improved, so that thebag 30 may even be made using one single material course if this should be required. - When using several material courses, the bag may be manufactured either of paper or equivalent altogether, or by using, one of the courses at least, various reinforcing materials, e.g. woven fabric material or equivalent.
- The reinforcing material has to be of a kind which endows the
bag 30 with adequate strength, and the reinforcing material may moreover be treated in a way preventing moisture penetration, in which case it will also constitute a moisture protection for thebag 30. The woven fabric material cannot become unravelled in the vicinity of the stitchedseam 38 at the valve end of the bag because theupper end margin 32 of the bag has been folded double. It is obvious, of course, that thelower end margin 33 of the bag may equally be folded double in like manner, although in that case a longer bag blank will be needed. - The invention is not critial as regards the succession in which cross-cutting, incision, valve folding and stitching of upper and lower part are performed.
- In the foregoing the invention has been described by way of example with reference to the figures of the attached drawing. By this it is not intended, however, to confine the invention to concern merely the examples presented in the figures: numerous modifications are feasible within the scope of the invention defined by the following claims.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86114154T ATE42938T1 (en) | 1985-10-17 | 1986-10-13 | SEWN VALVE SACK AND METHOD OF PRODUCTION. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI854058A FI71532C (en) | 1985-10-17 | 1985-10-17 | SOEMMAD VENTILSAECK OCH FOERFARANDE FOER FRAMSTAELLNING AV EN SAODAN. |
FI854058 | 1985-10-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0222184A1 EP0222184A1 (en) | 1987-05-20 |
EP0222184B1 true EP0222184B1 (en) | 1989-05-10 |
Family
ID=8521529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86114154A Expired EP0222184B1 (en) | 1985-10-17 | 1986-10-13 | Stitched valve bag and procedure for making same |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0222184B1 (en) |
AT (1) | ATE42938T1 (en) |
DE (1) | DE3663245D1 (en) |
FI (1) | FI71532C (en) |
SU (1) | SU1449009A3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5695055A (en) * | 1994-11-15 | 1997-12-09 | Kormanik, Jr.; Charles | Protective sleeve for golf bags |
WO1997017196A1 (en) * | 1995-11-10 | 1997-05-15 | Upm-Kymmene Oy | Hose-like blank of a plastic material and use of same in packages, in particular in sacks provided with a valve |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR971464A (en) * | 1948-09-09 | 1951-01-17 | Paper bag or container with valve for filling or closing | |
GB1239054A (en) * | 1968-07-22 | 1971-07-14 | ||
US4132347A (en) * | 1976-07-07 | 1979-01-02 | Showa Seitai Kogyo Kaisha Ltd. | Moisture proof bags provided with blow-in ports and method of manufacturing the same |
-
1985
- 1985-10-17 FI FI854058A patent/FI71532C/en not_active IP Right Cessation
-
1986
- 1986-10-13 DE DE8686114154T patent/DE3663245D1/en not_active Expired
- 1986-10-13 EP EP86114154A patent/EP0222184B1/en not_active Expired
- 1986-10-13 AT AT86114154T patent/ATE42938T1/en not_active IP Right Cessation
- 1986-10-16 SU SU864028438A patent/SU1449009A3/en active
Also Published As
Publication number | Publication date |
---|---|
EP0222184A1 (en) | 1987-05-20 |
ATE42938T1 (en) | 1989-05-15 |
SU1449009A3 (en) | 1988-12-30 |
FI71532B (en) | 1986-10-10 |
DE3663245D1 (en) | 1989-06-15 |
FI71532C (en) | 1987-01-19 |
FI854058A0 (en) | 1985-10-17 |
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