KR101090415B1 - Separable Inner Ply Multi Wall Kraft Paper Bag and Method for Preparing the Same - Google Patents

Abstract

The present invention relates to an endothelial detachable multi-layer bag and a method of manufacturing the same. The multi-layer bag of the present invention includes a bag body consisting of a cylindrical kraft paper shell and a synthetic film inner shell of the whole film, and the lower end of the synthetic resin endothelial is sealed by heat sealing. As a multi-layer bag having a fused portion, the lower end of the bag is sealed in a known manner,

The endothelial separation line is characterized in that the longitudinal cut line is provided at the center of the synthetic resin endothelial fusion portion. The multi-layer bag of the present invention can be easily removed from the perforation line when the user separates the inner endothelium containing the contents from the bag after opening only the top of the bag. It can fundamentally block contaminants, such as, from getting into food.

Bag, synthetic resin film, kraft paper, sealing, welding, sewing

Description

Separable Inner Ply Multi Wall Kraft Paper Bag and Method for Preparing the Same}

In general, two to five ply paper bags have been used as a bag for storing contents such as sugar, powdered coffee, flour, and chemicals, one of which is moisture to completely block moisture. A multi-layered bag composed of an inlay or a synthetic resin film capable of blocking has been used. As the outer shell material, paper or paper such as kraft paper is used, and as the inner shell material, a multilayer bag composed of a moisture blocking polypropylene film and a low density polyethylene (LDPE) film is used. The present invention relates to a multi-layer bag for use in storing perishable contents such as sugar, coffee, milling, chemicals and the like.

Packaging bags for food raw materials, such as sugar and milling, are usually multi-layer bags consisting of a kraft paper outer shell and a synthetic resin film inner shell. Sugar, milling, coffee powder, etc. stored in the multi-layer bag of such a configuration is transported to a food manufacturing plant such as fruit juice or candy or confectionery and mixed with food additives. For example, the sugar bag is transferred into the food manufacturing plant as it is. When the sugar is added to the raw material mixer and mixed, foreign matters such as dust, which may come off from the paper material such as kraft paper constituting the outer shell of the multi-layer bag, may be introduced during food manufacturing and contaminate the food. To prevent this, the procedure of removing the skin and then mixing only the inner skin with the contents into the factory is inevitable. In other words, before the sugar bag is put into the food process, it is necessary to go through the process of tearing the outer shell of kraft paper. In this case, the conventional multi-layer bag is because the endothelial and the outer shell is coupled by the sewing unit at the bottom of the bag, the consumer was able to separate the endothelial from the outer shell only by tearing off the upper side as well as the sewing thread cotton. However, this process has to raise the problem that needs to be improved because there is a problem that the process is cumbersome and time-consuming to separate the skin and the endothelium manually.

Conventional technology that can solve this problem is the Republic of Korea Patent Publication No. 10-2008-0040476 "double bag and its manufacturing method". In the above-described line art, an example is disclosed in which the end portion of the whole film and the seam that is sewn-coupled to the envelope is naturally detached when the contents are filled in the bag.

The upper end of the double cell bag of the line technology is the inner skin (synthetic resin film) and the outer skin (woven paper) is bonded by a hot melt adhesive portion, the bottom of the double cell bag is a film end and woven paper end, the sealing line and the seam line. Here, the endothelium is sealed by heat fusion at the sealing line and is joined together with the envelope at the seam. The upper and lower portions of the double bag is coupled to the sewing portion, the lower sewing portion in the final finishing process when manufacturing the bag, the upper sewing portion is sewn after filling the contents. The seam is sewn by sewing along the seam line with a cotton thread with a clip tape and a Fila coat at the end of the bag.

The line technology double bag is manufactured in a state where the lower part is sealed and the upper part is opened, and then supplied to the consumer, and the sugar, milling or coffee powder is filled, and the upper part is sealed by sewing or the like. do. When the contents are transported to the place of use, the consumer tears open the top sewing thread of the bag and then opens the contents from the bag.

By the way, according to the said line technique, the film end part which is an end part of an inner skin especially has a characteristic located inward of the woven paper end part which is an end part of an outer skin. As a result, the endothelial end region extending outside the seam becomes narrower, that is, only the end of the film end is bitten by the seam, and when the contents are filled and expanded in the seam, the endothelial film made of synthetic resin film that is bitten outside the seam by this expansion force. As the end is pulled in, the end of the endothelial that has been bitten by the seam is torn off, so that the endothelial is separated from the bag body.

However, the arrangement of the double-cylinder bag of this structure is important to the sealing line and the seam of the bottom line of the film, in consideration of the difference in elongation of the woven paper and the film is required to make the film formed about 7mm shorter than the woven paper. For example, if the seam is formed 12 mm away from the end of the bag (the sewing machine), the seam is seamed 5 mm from the end of the film, which is later torn off and separated from the woven paper. By the way, the line technology may be caused when the end of the synthetic resin film is sewn more than 5mm wide due to a change in the working environment, that is, the temperature or tension, and there is a problem that the endothelial is not broken and defective products are generated.

Therefore, in the multi-layer bag composed of the inner skin for protecting the inside of the contents and the outer skin to protect the outer surface of the contents, it is possible to manufacture by a relatively simple process, while being able to easily separate the inner skin from the skin after opening only the top of the bag. There is a need for providing a multi-layer bag that can easily separate the endothelium. Therefore, in the present invention, even when the manufacture of the multi-layer bag, even without the difficulty of adjusting the length of the endothelial and endothelial, even without the process of fitting the endothelial end bite to the seam, even if the outer skin and the endothelial are sewn together and sewn together, the contents are easily contained from the bag The present invention provides a multi-layer bag and a method of manufacturing the same for improving the problem of the conventional multi-layer bag described above.

In the present invention, the endothelial seam at the bottom of the bag is torn off, whereby the endothelial contents (wherein the endothelial contents is named endothelial body filled with contents) are separated from the bag body, instead of being fused as a sealing means (sealing). The part is split so that the endothelial contents are separated from the bag body. An object of the present invention is achieved by forming the endothelial bottom sealing fusion portion of the multi-layer bag half cut. The endothelial detachable multi-layer bag of the present invention is provided with an inner skin of a tube-like outer skin and a synthetic resin film which are laminated on both ends of sheet-like kraft paper, and the top of the bag is adhesively adhered and adhered by hot melt and adhesive, The lower end of the bag is sealed at the fusion by heat sealing with the lower end of the endothelial, and the lower end of the endothelium is sealed together with a closed method such as sewing together with the bottom of the outer skin.

In the endothelial detachable multilayer bag provided according to the present invention, the outer shell made of a tubular form and the endothelial of a tubular form are cut to the same length to form a bag. Usually, the endothelial film is cut together while the outer shell and the endothelial are overlapped. Due to its elasticity, it may be formed slightly shorter than the outer shell.

The outer shell according to the present invention is a paper made of kraft paper, and may be preferably composed of one ply (one ply) to four ply (four ply) kraft paper. In particular, in the case of 1 ply, woven paper made of polypropylene woven fabric and paper may be used. In addition, as the outermost shell, multiple papers prepared by laminating virgin pulp and recycled pulp may be used. Such woven paper or multiple paper forms are well known.

In order to facilitate the sealing process, it is preferable to use a film made of polyethylene resin, for example, a synthetic resin film such as LDPE (Low Density Polyethylene) or LLDPE (Linear Low Density Polyethylene), having a thickness of 60 to 150 μm. It may be, especially considering the ease of temperature control during heat fusion and the robustness and cost-effectiveness of the contents storage, it is preferable that the thickness of 80 ~ 100㎛. At this time, the endothelial fusion width is preferably 5 ~ 10mm. In the longitudinal center of the fusion zone, there is a perforation line formed by the pressing roller. The perforation line is cut in half, so that the endothelial fusion section is cut at the perforation line by holding the upper end of the endothelial body containing the contents and removing it from the bag. Can be separated.

According to another aspect of the present invention, there is provided a method for preparing an endothelial detachable multi-layer bag, including a bag-like shell cut into the same length using a known umbilical cord and a bag-shaped intermediate having a tube-shaped shell (only the upper end of the bag is enveloped). And an unfinished bag with adhesive endothelial adhesive). Next, the bag intermediate is moved to a sealing process, and sealing is performed at a position set in a predetermined distance from the bottom of the bag. In this case, the sealing is set at an arbitrary setting position at the bottom of the bag intermediate to define 4 to 5 heat bars. The temperature is gradually raised while passing, and the sealing is completed to form an endothelial fusion. The heating bar consists of a pair installed up and down, and the overlapped portion of the endothelial is melted and fused as the bottom of the bag intermediate passes between the heating bars. The heating bar temperature is set higher gradually as the bag intermediate proceeds. Thus, the bag-shaped intermediate body in which the fusion is formed passes through the final heating bar, and immediately passes through the press roller (impress roller) to form a cut line in the middle of the fusion. The press roller has a triangular protruding blade in the middle of the roller, and a hard rubber pad roller under the press roller. The bag intermediate body passes between the upper press roller and the pad roller, and the center of the fusion is pressed by the protruding edge Is formed. As described above, the bag formed with the perforated line is transferred to the next sealing process, and the lower end thereof is sealed. Known suture means may be sutured in a manner selected from sewing type, capping type, pinchback type, easy-open type, faceted valve bag type. Top closure is done separately after the contents are filled in the multilayer bag.

In one embodiment of the present invention, the endothelial fusion sealing temperature of the polyethylene-based resin material is 180 ~ 250 ℃, preferably 200 ~ 230 ℃ is suitable, in step of increasing the temperature of the heating bar in step backward Sealing is performed. If the temperature is 180 ° C. or lower, the fusion is not evenly formed, and if the temperature is higher than 250 ° C., the film is excessively melted, resulting in a problem of unsatisfactory cutting line formation. For example, when the outer shell structure of the bag is two layers, and five heating bars are present, the first heating bar temperature is generally 200 ° C., and the heating bar temperature is sequentially raised so that the fifth heating bar temperature is 230 ° C.

The multi-layer bag of the present invention having the above-described configuration, after the user only opens the top of the bag, it is easy to remove only the endothelial contents from the bag body at the perforation line and move it into the food workshop, so that contaminants such as dust derived from the outer skin paper are easily removed. It can fundamentally block the incorporation into food, and it is effective to keep the indoor environment of the food manufacturing site more clean. In addition, the present invention, the endothelial detachable multi-layer bag does not require a difficult procedure such as matching the gap between the heat sealing part and the sewing part in comparison with the double bag of the prior art in the manufacturing process, the manufacturing process is not only simple, convenient, but also the manufacturing cost Has the effect of reducing. In addition, in the case of the conventional double bag, there is a restriction that the bottom portion is to be sewn only by sewing type, but in the present invention, the endothelial detachable multi-layer bag is sewn in addition to the sewing type, the rod type, the pinchback type, the easy-open type, and the faceted valve back type. You can broaden your choice to the type you want.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1a is a perspective view showing the state of use of the present invention open-type multi-layer bag,

1B is an exploded perspective view of the present invention sewing type endothelial detachable multilayer bag.

Figure 2 is a schematic diagram of a multilayer bag drawn in an unfolded state in order to explain the configuration of the endothelial detachable multilayer bag according to an embodiment of the present invention.

3A and 3B are schematic views of the umbilical cord 100 of the present invention. FIG. 3 (a) is a left side view of the umbilical cord 100, and FIG. 3 (b) is a plan view of the umbilical cord 100. 3A and 3B, the umbilical cord 100 is a multi-layer bag intermediate supply unit 10, a line-up unit 20, a sealing unit 50, an exhaust unit 60, and a sewing unit 70. consist of. The supply unit 10 is composed of an automatic supply device for supplying the zone intermediates one by one, and the line-up unit 20 is provided with an alignment guard 21 and a transfer belt 22. Sealing unit 50 is a pair of five heating bars (53, 54, 55, 56, 57) consisting of two upper and lower, one row, the end of the pressing roller 51 and the corresponding pad roller 52 ) Is installed in pairs up and down. The conveyance belt 58 is installed to hold the bag intermediate along the side line of the heating bar of the sealing unit 50 to proceed to the next step. 3 (c) and (d) are enlarged views showing the structure of the press roller 51, (c) is a side view of the press roller 51, and (d) is a view of the press roller 51. The top view is shown. A triangular protrusion blade 501 is formed in the center of the push roller 51 made of metal. Reference numeral 71 is a sewing machine.

Figure 4 (a) to (d) is a partial cross-sectional view and a schematic flow chart for explaining the process of forming a cut line after heat-sealing the lower end portion of the endothelial separation type multi-layer bag sealing process according to an embodiment of the present invention,

5 (a) and 5 (b) are schematic plan views and side cross-sectional views for explaining a state after the endothelial and the outer skin are sewn and bonded to the lower end of the endothelial detachable multilayer bag according to an embodiment of the present invention.

As shown, the multi-layer bag 30 provided in accordance with one aspect of the present invention, with reference to FIGS. 1A-2, has an outer shell 32 and an inner shell 34, and the inner shell 34 has an outer shell ( 32) the cutting line 343 is present in the fusion portion 342, which is a sealing portion at the lower end of the inner shell 34 of the multilayer bag 30, as a means for solving the problem. It has structural features. Thus, the present invention is meaningful in that the conventional multi-layer bag structure, in particular, improved the endothelial sealing structure of the lower portion.

Figure 1a is a perspective view showing the use state of the easy-open type of the bottom closure method of an embodiment of the present invention multi-layer bag 20, the bottom of the multi-layer bag 20 is wrapped by an over-tape 45 to be bonded and sealed. The guard tape 46 and the extraction piece 47 for extracting the guard tape 46 are coupled to the overtape 45. 1B is an exploded perspective view of the sewing type endothelial detachable multi-layer bag 30 of the present invention, in which a sewing portion 40 composed of a clip coat 42, a pilar coat 43, and a cotton thread 44 is formed. It is shown in part.

The top of the multi-layer bag 30 of the present invention, that is, the bottom of the upper seam 37 of Figure 2 is provided with an adhesive portion 347, the outer shell 32 and the endothelial 34 at the portion indicated by the adhesive portion 347 is hot melt The adhesive and the adhesive gradually bond and adhere to each other. This is to attach the top portion of the outer shell 32 and the endothelial 34 in the form of dots so as to easily open the inlet of the multi-layer bag 30 when filling the contents. Hot-melt adhesion and adhesive adhesion by an adhesive are performed in ratio of 1: 2. That is, when 3-4 hot melt adhesive points are, about 6-8 adhesive adhesive points are about. For example, when the middle three are hot-melt-bonded, it is a formula which joins 3 and 4 to the left and right sides by an adhesive, respectively. This can prevent the synthetic film and paper from being pushed. In other words, if the whole is melted with a hot melt, it is difficult to tear, and if only the adhesive is applied, the inner skin and the outer skin may be pushed out. When the hot melt and the adhesive are used together, the above phenomenon may be prevented. The multi-layer bag 30 is folded at the fold line (324, 325), both ends of the outer joint portion (322, 323) can be formed into a tube-shaped bag by overlapping and bonded with an adhesive. In the example shown in FIG. 2, the endothelium 34 is shown as a tubular film. The lower end of the multi-layer bag 30 of the present invention has a double sealing structure of the fusion unit 342 and the sewing unit 40. The lower end of the endothelial 34 is fused and sealed at the fusion portion 342, which is located inward about 20 to 30 mm from the end, and the lower end thereof is sewn with a sewing machine at the lower seam 36. As such, the lower end portion 344 of the lower end portion 344 of the fusion portion 342 at the lower end of the endothelium 34 is sealed together with the end portion of the outer shell 32 in a sewing type or easy-open type.

4 schematically illustrates a process of forming a heat fusion and cut line 343 of a sealing process according to an embodiment of the present invention. FIG. 4 (d) shows the flow passing through the heating bars 53, 54, 55, 56, 57 and the press roller 51 while the multi-layer bag 30 is transferred by a transfer belt to form a heat fusion and a cutting line. 4 (a) to (c) schematically show a state in which the structure of the lower portion of the multi-layer bag 30 is changed in the sealing process through a section cut in the line AA.

Referring to FIG. 4, in accordance with the present invention, the lower end of the intermediate layer of the multi-layer bag 30 having the tubular outer shell 32 and the tubular inner shell 34 cut to the same length is shown in FIG. 4A. As shown in, the endothelial 34 and the outer shell 32 are not coupled and the ends remain open. The turret intermediate is passed through the heating bars 53, 54, 55, 56, 57 through the endothelial fusion 342 seated on the transfer belt 58 (not shown), as shown at the top of FIG. 4 (d). And then supplied in line-up unit 20 of FIG. The heating bar is, for example, a metal having a high thermal conductivity such as copper, and is heated in the endothelial fusion portion 342 of the multi-layer bag 30 carried on the conveyance belt 58, thereby being shown in FIG. As described above, the overlapped portion of the synthetic resin material is melted and sealed.

According to an embodiment of the present invention, the pressing roller 51 provided at a position continuous with the heating bars 53, 54, 55, 56, 57 is engaged with the lower pad roller 52 while rotating, thereby passing the multi-layer bag ( The center of the endothelial fusion portion 342 of 30 is pressed by the protruding blade 501. The fusion line 342, which is not cured by pressing, is pressed and a cut line 343 is formed in the center thereof. Accordingly, the endothelial fusion portion 342 melt-bonded by heat may be cut along the cut line 343 formed by the protruding edge 501. Thus, as shown in (c) of FIG. 4, the lower end of the endothelial 32 may be separated into an endothelial lower end 344 of the left side and an endothelial body portion 345 of the right side with respect to the perforation line 343.

Next, as shown in FIG. 5, the lower end of the multi-layer bag 30 is sewn by the sewing unit 40 to be coupled to the endothelial 32 and the outer shell 34 while simultaneously sealing the lower end of the outer shell 34. have. FIG. 5B is a schematic cross-sectional view of the plan view of FIG. 5A taken along line A-A. As can be seen intuitively in Figure 5 (b), the endothelial lower end portion 344 is coupled to the outer shell 34 at the same time in the sewing portion 40, but the endothelial body portion 345 is separated by the perforation line 343 ) Is in a state in which only half of the shell 34 is engaged with at least the bottom of the bag.

Although the lower end of the multi-layer bag 30 is an example of a sewing type is shown in Figure 5, as is well known in the art, the rod type, pinchback type, easy-open type, faceted valve back type, etc. Those skilled in the art will readily appreciate that the suture may be processed in a number of ways.

Although the present invention has been described through specific embodiments, various modifications are possible to those skilled in the art by referring to and combining various features described herein. Therefore, it should be pointed out that the scope of the present invention should not be limited to the described embodiments, but should be interpreted by the appended claims.

As described above, the multi-layer bag according to the present invention and its manufacturing method is not only widely available in the bag for storing food additives, such as sugar, milling, coffee powder, and the like, but also in the field of manufacture of coffee powder, Chemicals and the like can be stored in a completely enclosed state, which is a very useful invention in the art.

Figure 1a is a perspective view showing the state of use of the present invention open-type multi-layer bag,

1B is an exploded perspective view of the present invention sewing type endothelial detachable multilayer bag.

Figure 2 is a schematic view of the multilayer bag drawn in an unfolded state in order to explain the configuration of the endothelial detachable multilayer bag according to an embodiment of the present invention.

3 (a) is a left side view of the umbilical cord 100.

Figure 3 (b) is a plan view of the present invention bag 100.

Figure 4 (a) to (d) is a partial cross-sectional view and a schematic flow chart for explaining the process of cutting after heat-sealing the lower end portion of the endothelial separation multi-layer bag according to an embodiment of the present invention.

Figure 5 (a) and (b) is a schematic plan view and side cross-sectional view for explaining the state after the sewing portion is coupled to the lower end of the endothelial detachable multi-layer bag according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: umbilical cord 20: easy-open type multilayer bag (invention)

30: Sewing type multi-layer bag (invention) 32: Outer shell (kraft paper)

34: inner skin (synthetic resin) 36: lower seam

37: upper seam 322, 323: outer sheath

324, 325: fold line 342: fusion

343: perforation line 344: lower endothelial

345: endothelial body portion 347: adhesive bonding

42: clip tape 43: pilate coat

44: cotton thread 45: overtape

50: sealing unit 51: push roller

52: pad roller 53-57: heating bar

70: sewing unit 501: protruding blade

Claims (13)

It consists of 1 ~ 4 layers of cylindrical kraft paper outer shell and synthetic resin inner shell of whole film, and the lower part is sealed by one method selected from sewing type, rod type type, pinchback type, easy-open type, and faceted valve bag type. In the multilayer bag, The synthetic resin endothelial lower end portion has a fusion sealed by heat sealing above the end portion, characterized in that the longitudinal cut line is provided in the center of the fusion, endothelial separation multi-layer bag. delete The endothelial detachable multilayer bag according to claim 1, wherein the kraft paper envelope is composed of woven paper or multilayer paper of kraft paper and polypropylene woven fabric. The endothelial separation multi-layer bag of claim 1, wherein the synthetic resin endothelial fusion portion has a width of 5 to 10 mm. The endothelial separation multi-layer bag of claim 1, wherein the synthetic resin endothelium is a synthetic resin film made of low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) having a thickness of 80 to 100 µm. The method according to claim 1, wherein the multi-layer bag is bonded to each other by gradually bonding and adhering the upper shell and the inner skin with a hot melt adhesive and an adhesive, characterized in that the ratio of the adhesive point by the hot melt adhesive point and the adhesive is 1: 2, Endothelial detachable multilayer bag. The endothelial detachable multi-layer bag according to any one of claims 1 to 3, wherein the multi-layer bag is formed by sealing the lower end of the sewing type or the easy-open type. Manufacturing a bag intermediate having a tube-shaped kraft paper outer shell and a film-like synthetic resin inner shell cut into the same length using a umbilical cord; Transferring the bag intermediate to a sealing step to determine a welding part at a predetermined setting position at the bottom of the bag intermediate, and sealing by heating the step by step while heating the welding part through four to five heating bars; A step of forming a perforation line in the longitudinal direction at the center of the endothelial fusion by passing the pressing intermediate roller in which the sealing is completed and the endothelial fusion is formed; The method of manufacturing an endothelial detachable multi-layer bag characterized in that the step of transferring the multi-layer bag formed by the perforated line to the bottom sealing process to seal the bottom. The method according to claim 8, wherein the arbitrary setting position of the fusion portion is characterized in that the part located 20 to 30mm inward from the bottom end of the synthetic resin endothelial, endothelial separation multi-layer bag manufacturing method. The method of claim 8, wherein the sealing is performed at a sealing temperature of the heating bar at 180 to 250 ° C., but raising the sealing temperature step by step. The method of claim 8, wherein the multi-stage bag closure process is a sewing type or an easy-open type. delete delete

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