GB2172545A - Apparatus for the manufacture of an easy-to-open synthetic resin bag - Google Patents
Apparatus for the manufacture of an easy-to-open synthetic resin bag Download PDFInfo
- Publication number
- GB2172545A GB2172545A GB08609735A GB8609735A GB2172545A GB 2172545 A GB2172545 A GB 2172545A GB 08609735 A GB08609735 A GB 08609735A GB 8609735 A GB8609735 A GB 8609735A GB 2172545 A GB2172545 A GB 2172545A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bag body
- tear
- tear string
- string
- bonding
- 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.)
- Granted
Links
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
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/18—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps
- B65D33/20—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using pressure-sensitive adhesive
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/66—Inserted or applied tearing-strings or like flexible elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/74—Auxiliary operations
- B31B50/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
- B31B50/812—Applying tabs, patches, strips or strings on blanks or webs
- B31B50/8125—Applying strips or strings, e.g. tear strips or strings
- B31B50/8126—Applying strips or strings, e.g. tear strips or strings parallel to the direction of movement of the webs or the blanks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Bag Frames (AREA)
Abstract
Apparatus for bonding a tear string to an inner surface of a bag body comprises separating rollers (10, 11) for separating vertically an upper continuous laminated film (3-1) which will be the upper surface of said bag body from a lower continuous laminated film (3-2) which will be the lower surface of said bag body, a tear string-positioning member (16) slidable laterally on tubes 14, 15 between said upper and lower continuous laminated films (3-1,3-2); a tear string-receiving hole formed in the member (16); and a heat bonding means (18) for bonding said tear string to the upper surface of said bag body, located on the downstream side of said tear string-positioned member (16). <IMAGE>
Description
SPECIFICATION
Apparatus for the manufacture of an easy-to-open synthetic resin bag
In a conventional bag having a bag body constituted by placing two laminated films formed by laminating together several layers of synthetic resin film over each other and heat-sealing the peripheral edges thereof, when part of the bag body is opened in orderto remove the contents, since the bag body is constituted by laminated films, the bag body is difficult to tear and hence the opening process is difficult.
According to the present invention, there is provided an apparatus for bonding a tear string to an inner surface of a bag body comprising: separating rollers for separating vertically an upper continuous laminated film which will be the upper surface of said bag body from a lower continuous laminated film which will be the lower surface of said bag body; a tear string-positioning member slidably disposed laterally between said upper and lower continuous laminated films; a tear-string-receiving hole formed in said tear string-positioning member; and a heat bonding means for bonding said tear string to the upper surface of said bag body, located on the downstream side of said tear stringpositioning member.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which:
Figure 1 is a front elevation of an easy-to-open synthetic resin bag;
Figure 2 is a section taken along the line I-I of
Figure 1;
Figure 3 is a section taken along the line ll-ll of
Figure 1;
Figure 4 illustrates a transverse groove formed in a tab part of the bag body of the easy-to-open synthetic resin bag of Figure 1;
Figures Sthrough 9 illustrate other examples of the transverse groove shown in Figure 4;
Figure 10 is a perspective view of the easy-to-open synthetic resin bag of Figure 1 in which the tear string thereof is being pulled;
Figure 11 illustrates the tab;
Figure 12 is a perspective view of another bag body of an easy-to-open synthetic resin bag;;
Figure 13 is an enlarged section taken along the line Ill-Ill of Figure 12;
Figure 14 illustrates another example of the tab;
Figure 15 illustrates an easy-to-open synthetic resin bag in which a layer of bonding agent is provided on the bag body;
Figure 16 illustrates an embodiment of apparatus for manufacturing an easy-to-open synthetic resin bag, according to the present invention;
Figure 17 is a front elevation of a tear stringpositioning member of the apparatus shown in
Figure 16;
Figure 18 is a section taken along the line IV-IV of
Figure 17;
Figure 19 is a section taken along the line V-V of
Figure 17; and
Figure 20 is a plan view of the tear string inserting mechanism shown in Figure 16.
As shown in Figures 1 and 2, a synthetic resin bag body A is constituted by a laminated film formed by laminating together the required number of layers of synthetic resin film. A base film 1 comprising one or more layers has a heat-sealable plastic film layer 2 laminated on the inner surface thereof. Two laminated films 3 each constituted by laminating together the base film 1 and the heat-sealable plastic film layer 2 are placed with the heat-sealable plastic film layers 2 facing each other, and the peripheral edges of the laminated films 3 are subjected to ultrasonic or heat sealing to constitute the bag body A.
Reference numeral 4 denotes the heat-sealed edges.
A synthetic resin material having such properties as moisture resistance, heat resistance and an ultraviolet-screening property is employed the base film 1. For the heat-sealable plastic film layer 2, it is possible to employ any material which enables the welding of the heat-sealable plastic film layers 2 to each other when the peripheral edges of the bag body A are subjected to ultrasonic or heat sealing.
The position of the opening of synthetic resin bag body A constituted by the laminated film with the arrangement as described above has a tear string B bonded to one inner surface of the bag body A, i.e., one of the heat-sealable plastic film layers 2, as shown in Figure 2.
It is possible to employ any kind of synthetic resin thread, natural thread or metal wire thread for the tear string B, and it can be either a single thread or a twisted yarn.
In order to bond the tear string B of this kind to the inner surface of the heat-sealable plastic film layer 2, such methods as follows can be used: the outer surface of the tear string B is formed of a heatsealable resin, thereby enabling the heat-bonding thereof; the tear string B is formed of a twisted yarn consisting of heat-sealable fibers, thereby enabling the heat-bonding thereof; or the surface of the tear string B is coated with a heat-sealable resin b as shown in Figure 2, thereby enabling the simple bonding of the string to the heat-sealable plastic film layer 2 on heating.
It must be noted that besides the embodiment wherein the tear string B is bonded to one side wall of the bag body A, the tear string B can be bonded all around the side walls as shown in Figures 12 and 13.
The end C of the tear string B is clamped between the peripheral edges of the laminated films 3 placed over each other. The end C of the tear string B is provided with a tab D, which has the following structure.
Side notches 5, 5' are formed on both sides of the end C in the pulling direction thereof. A transverse groove 6 is formed crossing the tear string B, with a certain space S provided between the transverse groove 6 and the ends of the notches 5, 5' so that the tab D is formed by the side notches 5, 5' and the transverse groove 6.
The space S provided between the ends of the notches 5, 5' and the transverse groove 6 is to allow the tab D between the side notches 5, 5' to be supported by the heat-sealed edge 4 at the peripher al edge of the bag body, and the ends of the transverse groove 6 are positioned so as to be at least outside the ends of the corresponding side notches 5, 5'. Thereby, if the tear lines deviate during in the process of tearing through the spaces S from the ends of the side notches 5, 5', the tear lines will inevitably reach the transverse groove 6.
A variety of shapes are available for the shape of the transverse groove 6 as shown in Figures 4 through 9.
It is desirable that the angle a between the transverse groove 6 and the tear string B toward the interior a of the bag body A shouid be at least 90 . If the angle is less than 90 , the force applied when tearing cannot be concentrated on the area n which is the intersection between the tear string B and the transverse groove 6, so that it becomes difficult for the tear string B to tear through the laminated film 3 smoothly.
The bag bodyAshown in Figure 12 is formed in such a way that the edges of a flat laminated film 3 are first laid over each other, the doubled edge is subjected to heat sealing in order to form the laminated film 3 into a tubular shape, and then the upper and lower ends thereof are sealed to obtain a hermetically sealed bag. Side notches 5, 5' and a transverse groove 6 which are similar to those shown in the first embodiment are formed in the edge of the overlapped seal 7, and the tab D is formed over the end C of the tear string B.
In such a folded bag, since the end C of the tear string B overlaps the other end C, one of the tear string ends C is cut at a piace corresponding to the transverse groove 6 (i.e. at X). Therefore, pulling the tab D enables the pulling of only the tear string B on the other side to tear open the bag body.
The side notches 5, 5' and the transverse groove 6 are formed at both edges of the flat laminated film 3 before forming the overlapped seal 7, and the ends of the laminated film 3 are laid over each other to form the overlapped seal 7. In this case, each of the side notches 5, 5' and the transverse groove 6 is formed, not as a vertical notch-like groove along a line, but as a notch-like groove with a rather larger width, thereby absorbing any slightly offset in the positions when the right and left edges are laid over each other, and thus allowing the notches in the right and left edges to align with each other.
It must be noted that when the width of the heat-sealed edge 4 is narrow, the part of the heat-sealed edge 4 around the reverse groove 6 is formed so have a wider width as shown in Figure 14.
Figure 15 shows a bonding agent 8 applied to the part of the bag body A above the opening thereof, with a peel-off strip 9 removably attached to the bonding agentS, which are used for closing the opening by bending over the upper part of the bag body A after is has been opened by pulling the tear string B.
An apparatus for manufacturing an easy-to-open synthetic resin bag will be described below.
This bag-manufacutring apparatus is constructed as shown in Figures 16 through 20. In other words, upper and lower separating rollers 10,11 are provided facing each other so as to separate vertically an upper continuous laminated film 3-1 which will be the upper surface of the bag body from a lower continuous laminated film 3-2 which will be the lower surface of the bag body. On the downstream side of the separating rollers 10, 11 as viewed in the direction of flow of the films, rollers 12, 13 are provided which again superimpose the upper and lower laminated films 3-1,3-2 which were vertically separated from each other, and two pipes 14, 15 can be horizontally displaced in the space between the vertically separated laminated films 3-1,3-2.Tear string-positioning members 16 are slidably attached to the pipes 14, 15. The tear string-positioning members 16 each have a hole 17 for receiving tear strings B-1 pulled from the side. The tear strings B-1 passing through the receiving holes 17 are positioned by the lateral sliding of the tear stringpositioning members 16, thereby allowing tear strings B-1 to be sandwiched between the upper and lower laminated films 3-1,3-2. The upper and lower laminated films 3-1,3-2 are superimposed, sandwiching between them the tear strings B-1, by means of the rollers 12,13, are separated vertically again, and then the tear strings B-1 and the upper laminated film 3-1 are bonded together by means of a heat-bonding means 18.
On the downstream side of the heat-bonding means 18, a bag making means 19 and a cutting means 20 are provided for heat-sealing and cutting the bag edges, thereby manufacturing the bags.
The tear string-positioning members 16 will be described below in greater detail. As shown in
Figures 17 through 19, the two pipes 14, 15 are arranged so as to be clamped by a front plate 21 and a rear plate 22 and fastened by means of a fixing bolt 23. A bolt 24 with an axial hole 25 is screwed into the front plate 21 so as to pass between the pipes 14, 15.
A tear string B-1 is inserted through the hole 25 of the bolt 24, passed between the pipes 14, 15 and led from a receiving hole 17 formed in the rear plate 22.
A puncher 26, which is provided on the downstream side of the separating rollers 10,11 has the function of applying the transverse grooves 6 to the previously overlapped laminated films 3-1,3-2 in order to form the tab D.
The side notches 5,5' constituting the tab D are formed by the cutting means 20 simultaneously with the cutting of the continuous bag body A.
From the above description, it will be appreciated that in order to remove the contents of the bag body
A, pulling the tab D formed in the heat sealed edge 4 around the peripheral edge of the bag body A causes the tear string B to tear through the laminated film 3 forming the upper surface of the bag body A to open the bag. Accordingly, it is possible to obtain the effect that the bag body A can be easily and surely opened along the tear string B.
Moreover, when manufacturing continuously bag bodies A of the above type, the continuous laminated films 3-1, 3-2 are vertically separated by means of the separating rollers 10, 11, respectively, and the tear string B is led into the space therebetween from the tear string-positioning member 16 and is sandwiched between the upper and lower laminated films 3-1,3-2 and then bonded to the upper lamin ated film 3-1 by means of the heat-bonding means 18, thereby allowing the bag bodies A two be manufactured continuously.
Claims (2)
1. An apparatus for bonding a tear string to an inner surface of a bag body comprising: separating rollers for separating vertically an upper continuous laminated film which will be the upper surface of said bag body from a lower continuous laminated film which will be the lower surface of said bag body; a tear string-positioning member slidably disposed laterally between said upper and lower continuous laminated films; a tear-string-receiving hole formed in said tear string-positioning member; and a heat bonding means for bonding said tear string to the upper surface of said bag body, located on the downstream side of said tear stringpositioning member.
2. Apparatus for bonding a tear string to the inner surface of a bag body substantially as hereinbefore described with reference to Figures 16 to 20 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08609735A GB2172545B (en) | 1983-02-18 | 1986-04-22 | Apparatus for the manufacture of an easy-to-open synthetic resin bag |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08304532A GB2135651B (en) | 1983-02-18 | 1983-02-18 | Easy-to-open synthetic resin bag and apparatus for the manufacture thereof |
| GB08609735A GB2172545B (en) | 1983-02-18 | 1986-04-22 | Apparatus for the manufacture of an easy-to-open synthetic resin bag |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8609735D0 GB8609735D0 (en) | 1986-05-29 |
| GB2172545A true GB2172545A (en) | 1986-09-24 |
| GB2172545B GB2172545B (en) | 1988-01-20 |
Family
ID=26285269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08609735A Expired GB2172545B (en) | 1983-02-18 | 1986-04-22 | Apparatus for the manufacture of an easy-to-open synthetic resin bag |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2172545B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0372215A1 (en) * | 1988-11-04 | 1990-06-13 | Avery Etichette Italia S.P.A. | Glued Hermetically sealed envelope with opening device |
| FR2686572A1 (en) * | 1991-05-29 | 1993-07-30 | Pruvost Bernadette | Re-closable sachet with facilitated (easy) opening, or else re-closable packaging sachet with facilitated opening |
| WO1995030601A1 (en) * | 1994-05-05 | 1995-11-16 | Sales S.P.A. | Opening device for flexible containers, container provided with such a device and application method thereof |
| EP1916198A1 (en) | 2006-10-23 | 2008-04-30 | Packs Co., Ltd. | Packing bag made of resin |
| WO2011121337A3 (en) * | 2010-03-30 | 2012-05-10 | Cadbury Holdings Limited | Packaging |
| WO2015101446A1 (en) * | 2013-12-30 | 2015-07-09 | Tetra Laval Holdings & Finance S.A. | Packaging container with opening device and method for manufacturing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1120701A (en) * | 1964-10-26 | 1968-07-24 | Dow Chemical Co | Method for incorporating a tear string in a web |
-
1986
- 1986-04-22 GB GB08609735A patent/GB2172545B/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1120701A (en) * | 1964-10-26 | 1968-07-24 | Dow Chemical Co | Method for incorporating a tear string in a web |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0372215A1 (en) * | 1988-11-04 | 1990-06-13 | Avery Etichette Italia S.P.A. | Glued Hermetically sealed envelope with opening device |
| FR2686572A1 (en) * | 1991-05-29 | 1993-07-30 | Pruvost Bernadette | Re-closable sachet with facilitated (easy) opening, or else re-closable packaging sachet with facilitated opening |
| WO1995030601A1 (en) * | 1994-05-05 | 1995-11-16 | Sales S.P.A. | Opening device for flexible containers, container provided with such a device and application method thereof |
| AU689899B2 (en) * | 1994-05-05 | 1998-04-09 | Sales S.P.A. | Opening device for flexible containers, container provided with such a device and application method thereof |
| US5836697A (en) * | 1994-05-05 | 1998-11-17 | Sales S.P.A. | Opening device for flexible containers, container provided with such a device and application method thereof |
| CN1076306C (en) * | 1994-05-05 | 2001-12-19 | 沙利斯股份公司 | Opening and closing device for flexible containers and container with such device and adhere method therefor |
| EP1916198A1 (en) | 2006-10-23 | 2008-04-30 | Packs Co., Ltd. | Packing bag made of resin |
| WO2011121337A3 (en) * | 2010-03-30 | 2012-05-10 | Cadbury Holdings Limited | Packaging |
| US20130224346A1 (en) * | 2010-03-30 | 2013-08-29 | Cadbury Holdings Limited | Packaging |
| AU2011234211B2 (en) * | 2010-03-30 | 2014-08-14 | Mondelez Uk Holdings & Services Limited | Packaging |
| AU2011234211C1 (en) * | 2010-03-30 | 2015-03-05 | Mondelez Uk Holdings & Services Limited | Packaging |
| US9902541B2 (en) * | 2010-03-30 | 2018-02-27 | Mondelez Uk Holdings & Services Limited | Packaging |
| WO2015101446A1 (en) * | 2013-12-30 | 2015-07-09 | Tetra Laval Holdings & Finance S.A. | Packaging container with opening device and method for manufacturing the same |
| CN105849003A (en) * | 2013-12-30 | 2016-08-10 | 利乐拉瓦尔集团及财务有限公司 | Packaging container with opening device and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2172545B (en) | 1988-01-20 |
| GB8609735D0 (en) | 1986-05-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20030217 |