KR20150079515A - Manufacturing method of waterproof bag and waterproof bag made by the same - Google Patents

Abstract

The present invention relates to a waterproof bag manufacturing method comprising the steps of: a) squeezing a film or films onto one face or both faces of a bag; b) thermally squeezing a surplus film of both ends of a bag fabric parallel to a bag proceeding direction after folding the films inward; c) cutting the thermally squeezed bag; and d) sewing one end of the cut portion. A waterproof film or waterproof films are adhered onto one face or both faces of the bag and then cut, then the remaining surplus film is folded toward the bag fabric and then is thermally squeezed to dramatically reduce the occurrence of defective products, and there is an advantage of preventing breakage of the bag through squeezing of the surplus film. In addition, a deoxidized composition is input to a film manufacturing composition to further improve the waterproof function, thereby preventing the contents from being denatured.

Description

Technical Field [0001] The present invention relates to a method for manufacturing a waterproof bag and a waterproof bag manufactured from the same,

More particularly, the present invention relates to a method of manufacturing a round bag for packaging cereals, agricultural products, and articles, a waterproof bag, and a waterproof bag manufactured from the same by adhering a waterproof film to the surface of the bag, .

In general, plastic bags are used to contain contents such as chemical fertilizers, soils, organic matter, cereals, feed for livestock, mortar, and calcium hydroxide. Such plastic bags can be mass-produced at low cost, And it is manufactured in various forms in order to completely protect the contents from moisture and other external environment factors.

Since the lower end of the bag body is sealed with a seam, the waterproof property of the bag is lowered due to the needle hole formed at the time of sewing, and the lower end of the bag body is double- There has been a problem that loss of the main body of the bag occurs.

 Another conventional technique is a method of sewing a lower end portion of a bag for wrapping a fabric or a film in the form of a polyethylene filament and thermally fusing a sealing material of a two-layer structure composed of a polyethylene woven layer or a film layer and a heat- . However, there is a problem that the heat-seal adhesive layer is not effectively formed as a seam line portion when the sealing material is adhered, which reduces the effect of the sewing and increases the manufacturing cost.

In order to solve such a problem, Korean Patent Registration No. 10-1039654 discloses a method for manufacturing a bag using a double waterproof sheet which is formed by laminating a woven fabric sheet and a paper sheet together to form a woven laminated sheet and partially bonding and forming a synthetic resin film thereon . However, even if the bag is manufactured as a sheet-like sheet type, a surplus synthetic resin film formed on both ends of the bag is left in the molding process, and a process for removing the surplus synthetic resin film is further required. When the bag is removed using a physical method, , There is a disadvantage that it is difficult to apply to the automated process due to a high defect rate due to the fact that the tension formed on the supplied base bag is not always constant and the bag is cut together with the film.

Korean Patent No. 10-1039654 (June 08, 2011)

In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems in that a waterproof film is adhered to one side or both sides of a bag, and then the remaining surplus film is folded toward the fabric side and then thermally pressed to reduce defective products, A method for manufacturing a waterproof bag is provided.

Another object of the present invention is to provide a method for manufacturing a waterproof bag which further improves the waterproof function by introducing a deoxygenating composition into a composition for producing a film.

Another object of the present invention is to provide a waterproof bag manufactured by any one of the above manufacturing methods.

It is still another object of the present invention to provide a waterproof bag manufacturing apparatus capable of manufacturing a waterproof bag by applying the manufacturing method.

The present invention relates to a method for manufacturing a waterproof bag and a waterproof bag manufactured therefrom.

One aspect of the present invention is a waterproof sanitary ware including a base bag having an opening at an upper portion thereof and a storage space therein and a film formed on an outer surface of the base bag, And a waterproof bag provided with a closed portion folded inwardly of the base bag.

Wherein the base bag can be made of fibers comprising any one or a mixture thereof selected from polyethylene, polypropylene, polyamide, polyacryl and rayon, the film being made of polyethylene, polypropylene, polyamide, Rayon, or a mixture thereof.

In another aspect of the present invention, 1 to 5 parts by weight of any one or two or more additives selected from a surfactant, a light stabilizer, an antioxidant, a non-slip agent, an antirust agent and a dehumidifying agent is added to 100 parts by weight of the resin constituting the base bag or film And the like.

Another embodiment of the present invention is a method for producing a film, which comprises mixing 100 parts by weight of the resin constituting the film with one or two or more metals or metals selected from aluminum, magnesium, zinc, copper, iron, tin, cobalt, manganese, And 0.05 to 1 part by weight of a compound.

Another aspect of the present invention is

A base bag winding roller in which a base bag is stored;

A hopper in which raw materials of the film formed on one side or both sides of the base bag are stored;

An extruder for extruding the raw material stored in the hopper to the surface of the base bag;

A guide roller for guiding the base bag or film to the pressing roller;

Pressing the film onto one side or both sides of the base bag, heating the pressing roller;

A folding unit for folding the surplus film at both ends parallel to the advancing direction of the bag in the bag passing through the pressing roller, in the inward direction of the bag, And

A take-up roller for winding up the bag through the folding mouth;

To a waterproof bag manufacturing apparatus. At this time, the pressing roller may be heated to 200 to 300 ° C, and the folding cup may be heated to 150 to 250 ° C.

Another aspect of the present invention is

a) pressing a first film having a width greater than the width of the base bag on one side of the base bag;

b) folding a surplus film formed over both ends of the base bag in the first film so that an end of the surplus film is positioned inside the base bag;

c) pressing a second film having a width smaller than the width of the base stock to the back surface of the base stock;

d) cutting the base bag having the first film and the second film attached on both sides thereof, respectively; And

and e) sewing the cut portion of the base bag.

The waterproof bag according to the present invention has a waterproof film adhered to one side or both sides of the bag and is cut, and the remaining surplus film is folded toward the bag cloth and thermally compressed to reduce the generation of defective products. And it is advantageous to prevent breakage of the magazine by pressing the surplus film. In addition, the deoxygenating composition can be added to the composition for film production to further improve the waterproof function and prevent denaturation of the contents.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a bag manufacturing apparatus according to an embodiment of the present invention; FIG.
FIG. 2 is a perspective view illustrating a method for pressing a surplus film according to an embodiment of the present invention. FIG.
Figure 3 is a front view of a turret manufactured in accordance with one embodiment of the present invention.
FIG. 4 is a cut-away perspective view of a bag manufactured according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of manufacturing a waterproof sanitary napkin according to the present invention and a waterproof sanitary napkin fabricated therefrom will be described in detail with reference to the accompanying drawings. The following drawings are provided as an example so that a person skilled in the art can sufficiently convey the idea of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the drawings presented below may be exaggerated in order to clarify the spirit of the present invention. Also, like reference numerals designate like elements throughout the specification.

Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may unnecessarily blur are omitted.

The waterproof bag according to the present invention comprises a base bag having an opening at an upper portion thereof and a storage space therein, and a waterproof bag including a film formed on an outer surface of the base bag, And a surplus film may be formed by folding the inside of the base bag to form a pressed finishing portion.

3 is a view showing the finished portion 21 and the sewing yarn 22 of the manufactured turret 30. The finished turret is sewed with the lower end through a turret maker, By sewing, it is possible to prevent desorption of the finishing portion.

The finishing portion 21 is formed by thermocompression bonding the surplus film that has not been adhered to the base bag through the folding mouth in the process of manufacturing the waterproof bag, and at the same time, it is formed on both sides along the longitudinal direction of the waterproof bag. . The length of the width formed according to the pressing process of the film can be determined by the finishing portion, and the present invention is not limited to this, but it is preferable to maintain about 1 to 10 mm.

* 38 FIG. 4 shows a cross-sectional view of the bag according to the present invention, in which the film is thermally pressed on the upper and lower sides of the bag 10. In FIG. 4, the bag is not shown in detail but is made of two layers, and the upper and lower films are thermocompression bonded to each bag.

More specifically, the base bag may be fabricated by a method known in the art, and may be a film, a nonwoven fabric, or a fibrous weft yarn and a warp yarn cut into a thin band shape It is possible to have a fabric (fabric) in a lattice structure. In this case, when the base bag is woven in the form of a fabric, the weft, the warp of the warp, and the shape of the cross section can be freely changed according to the purpose and form of the bag.

The material of the film or the fabric constituting the base bag is not limited, but may preferably include any one selected from polyethylene, polypropylene, polyamide, polyacryl, and rayon, or a mixture thereof, preferably polyethylene Woven in the form of a fabric woven with terephthalate or polypropylene fiber can prevent penetration of moisture and water and is excellent in impact resistance, scratch resistance and chemical resistance, and is easy to manufacture.

In addition, flexibility can be added when the weft and weft yarns are woven in a lattice structure, and when carrying the contents such as grain or ice, the shape of the bag is naturally deformed according to the movement of the weft, The possibility of breakage of the turret due to pressure can be reduced.

The film is adhered to one side or both sides of the bag so as to prevent infiltration of water, moisture, dust or other foreign matter, and the physical properties of the film are not changed even if a certain amount of heat or pressure is applied to a portion where a drawing or a print is printed, So that separation between the bag and the film does not occur even during the altar or sewing.

The film is not limited to a material, but is preferably produced by uniaxially or biaxially stretching one or a mixture thereof selected from polyethylene, polypropylene, polyamide, polyacryl, and rayon, more preferably poly Use of propylene is preferable because it has excellent print sharpness and excellent flexibility and strength.

As described above, the waterproof bag according to the present invention having the finishing portions formed on both sides along the longitudinal direction of the bag by thermally pressing the surplus film can easily and quickly thermally compress the surplus film in the middle of the manufacturing process, There is an advantage that there is no waste of time and labor due to cutting. Also, since the film is formed on the outside, moisture and water can be prevented from penetrating into the inside of the bag, so that the bag itself can be prevented from being damaged, thereby preventing discoloration and alteration of the contents. Also, because of the flexibility, the shape of the bag can be naturally deformed even when the contents contained in the bag are moved or external pressure is applied during transportation or circulation, so that the bag can be prevented from being damaged due to a sudden change of state, So that it is possible to save manufacturing cost by eliminating the need for an additional adhesive. In addition, since the film layer reinforces the strength of the bag itself by supporting the base bag, there is an advantage that the bag can be prevented from being damaged or ruptured due to external pressure, impact, or load of the contents during transportation.

The waterproof bag according to the present invention

a) squeezing the film on one or both sides of the bag;

b) folding the surplus film at both ends of the bag fabric parallel to the direction of the bag in the inward direction of the bag, followed by thermocompression;

c) cutting the thermocompressed turf; And

d) sewing one of the cuts;

. ≪ / RTI >

First, in step a), the film is squeezed on one side or both sides of the bag. The film may be squeezed through a press roller while supplying the rolled film together with the roll in the same manner as a general laminate film production method. However, the hopper for storing the polymer film raw material and the raw material of the film are extruded or sprayed onto the surface of the base cloth The extruder can be used to squeeze the base bag.

In detail, a base bag is wound on a take-up roller as shown in FIG. 1, and is guided to a press roller through a guide roller, and a pair of hoppers and an extruder are provided thereon to spray a film material onto one surface of a base bag, To thermocompress the film on one side of the base bag. In the same manner, a film can be further formed on one side of the base bag on which no film is formed. At this time, however, the pressing roller 102 maintains the heated state so that the film and the bag can be adhered even without an adhesive. At this time, one or more of the hopper and the extruder may be provided, and the hopper and the extruder may be freely added or subtracted according to the structure and the shape of the formed film.

The heating temperature of the pressing roller 103 is preferably 200 to 300 占 폚, more preferably 230 to 280 占 폚, so that it is possible to prevent the bag from being wrinkled or curled during the manufacturing process due to low thermal deformation.

Also, in the step a), the supply speed of the bag and the film may be 10 to 40 m / min.

When the film is squeezed on one side or both sides of the turret via the pressing roller, the surplus film remaining on both ends of the turret cloth parallel to the advancing direction of the turret in step b) is folded inward in the turret and thermocompression is performed.

The thermocompression is a step for neatly and effectively removing the remaining excess film adhering to the surface of the bag without the additional firing or cutting process. The thermocompression bonding can be performed through a 'C' shaped folding unit as shown in FIG.

The folding unit may be made of a material that is the same as or different from the material of the compression roller after the excess film is folded back into the bag and thermocompression is performed. In addition, the folding mouth can be thermocompression-bonded in a heated state. The heating temperature of the folding mouth can be freely adjusted according to the glass transition temperature of the film, but is preferably in the range of 150 to 200 ° C.

When the surplus film is folded inward through the folding mouth to thermocompression, the thermocompressed turret can be cut as in step c). The cutting in the step c) is not limited to the cutting method, the cutting apparatus, and the size of the cut bag, and is freely changeable according to the use of the manufactured bag. In addition, the thermocompressed turret may be wound around a cutter for convenience of the process.

The bag cut at a predetermined size through step c) may be manufactured by sewing one end of the bag through a sewing machine as in step d). This can be easily carried out through a bag making machine used for manufacturing a bag containing ordinary grains, ice, and the like. The sewed one end serves as a lower end portion, the upper end portion which is opened is filled with grains and the like, By sewing through the sewing machine, the bag becomes a sealed bag.

In addition, the bag according to the present invention may further comprise one or more additives 1 to 3 selected from surfactants, light stabilizers, antioxidants, non-slip agents, rust inhibitors and dehumidifiers in 100 weight parts of the resin constituting each of the bag fabrics or films, 5 parts by weight.

In order to further improve the heat resistance and the impact resistance, the bag according to the present invention is preferably selected from aluminum, magnesium, zinc, copper, iron, tin, cobalt, manganese, sodium chloride, potassium chloride and calcium chloride And may further contain 0.05 to 1 part by weight of any one or two or more metals or metal compounds.

The film constituting the outer layer of the bag can be produced by using a heat-resistant resin, but has a problem of processing and high cost. Also, when the Young's modulus is low, the tensile strength is low and cracks may occur in the film itself. The above metal or metal compound is intended to overcome this disadvantage and to improve the heat resistance and impact resistance, and does not limit the shape such as the particle shape or the ion shape. However, in the case of the particle form, it is preferable that the film is nano-sized in order to maintain the transparency of the film, preferably 1 to 100 nm, while the transparency of the produced film is maintained while exhibiting desired heat resistance and impact resistance, Do.

When the metal or metal compound is added in an amount of less than 0.05 part by weight, the heat resistance and impact resistance required in the present invention may not be sufficiently exhibited. If the amount is more than 1 part by weight, transparency of the film decreases, The mechanical properties of the film may be greatly reduced.

The bag according to the present invention may further include 0.05 to 1 part by weight of a phase transition material with respect to 100 parts by weight of the resin constituting the film in order to improve the storage property of the material contained therein.

The phase-change material (PCM) is a thermal storage material used to control the temperature change. By using a chemical bond to store or discharge heat, the material contained in the metal can be stored at a certain temperature . Examples of the phase transition material usable in the present invention include fatty acids such as caprylic acid (CH ₃ (CH ₂ ) ₆ COOH), Glauber's salt, manganese nitrate hexahydrate _{, Mn (NO 3) 2 H} 2 O), nitride oxide of manganese tetrahydrate (manganese nitrate hexahydrate, Mn (NO 3) 2 H 2 O), nitride of zinc hexahydrate _{(zinc nitrate hexahydrate, Zn 2 (} NO 3) 2 · 6H ₂ O). However, the present invention is not limited thereto, and other phase transition materials may be used.

The phase change material may be mixed in the form of a polymer when the film is prepared, but it is more preferable to inject the phase change material in the form of a microcapsule having an outer shell of an inorganic material. In addition, since the phase transition material in the microcapsule form has a high hardness, the frictional coefficient of the bag manufactured is greatly increased, and slippage of the bag can be prevented even when the bag according to the present invention is stacked.

 The wall-forming material constituting the outer shell is preferably a precursor-type inorganic material capable of forming a capsule with high hardness. As the wall-forming material, any one or two or more materials selected from silica, titania, zirconia, zinc oxide nanoparticles, and the like may be included. Among them, considering the high strength and easiness of encapsulation, titania, zirconia Is preferred.

The microcapsules are prepared by dispersing a phase transition material, which is the content of the microcapsules, in a production method commonly practiced by a person skilled in the art, that is, in a dispersion medium having emulsification safety, and then stirring the emulsion dispersion to produce a capsule film. The resulting capsule film can be completed by adding a curing agent or a reactive agent to cure the cured film.

1 is a perspective view of a manufacturing apparatus for a waterproof cannon according to an embodiment of the present invention. The bag manufacturing process (1) according to an embodiment of the present invention includes a base bag rewinding A first hopper 105a and a second hopper 105b for storing the raw material of the film formed on one or both sides of the base bag and a roller 101. The hopper 105b is provided at a lower end of the hopper, A first extruder 106a and a second extruder 106b for extruding or injecting the base bag into a pressurizing roller 102 and a guide roller 103 for guiding the base bag to the press roller 102, The rewinding rollers 107 that wind the reel through the folding openings 104a and 104b for folding the surplus film left on both ends of the base bag to the inside of the bag and attaching them to the bag,It should. In Fig. 1, only the winding roller is shown, but the bag cutting apparatus and the sewing apparatus are not shown, and the cutting apparatus and the sewing apparatus are possible with the bag manufacturing apparatus and the manufacturing method which are generally used by those skilled in the art.

A film formed by the first hopper 105a and the first extruder 106a is referred to as a first film and a film formed by the second hopper 105b and the second extruder 106b is referred to as a second film It is called.

The hopper 105a, 105b is filled with a mixture of raw materials of the film, and the raw material is not limited in shape, but is preferably in a liquid phase. In addition, a stirring device (not shown) such as a screw or a heating device (not shown) may be further provided therein to uniformly mix the raw materials of the film.

The extruders 106a and 106b are for spraying the film raw material in order to form a film on one side of the base bag and apply it as a base bag. The spraying method is not limited to the apparatus, but a spraying method having a spray nozzle is most preferable. In the case of forming the film by the spraying method, as compared with the conventional method in which a plate-shaped film is separately manufactured and equipped with a rolling roll, the film can be formed and pressed at the same time through the pressing roller without having to provide a rolling roll There are side effects such as equipment simplification and energy saving.

Also, as shown in FIG. 1, the folding openings 104a and 104b can adjust the position of the base bag according to the shape of the film formed on the surface of the base bag, the length of the excess film, and the shape of the extruder. 3, the width of the film formed on the surface of the base can be larger or smaller than the width of the turret, so that the width of the first film is equal to the width of the turret, , The folding mouth is formed only at the position 104b, and is formed at the same position even if the widths of the first and second films are both larger than the bag.

Further, if the width of the first film is larger than the width of the turret, if the width of the second film is smaller than the turret, the folding opening may be formed only at the position 104a. The width of the film may be d 0.5 to 5 mm based on the width d of the waterproof bag to be manufactured.

FIG. 2 is a perspective view showing a folding mouth which is a feature of the present invention. The folded film can be folded into the bag as it passes through the folding mouth 104 as described above. 2, the excess film folded inwardly of the bag can be defined as a finishing portion 21. [ In addition, although the shape of the folding mouth is not limited in its shape and size, it is preferable to have a groove in the form of a " C " or horseshoe so that the surplus film can be flexibly folded inside the bag, Cm and the height of the groove is 0.1 to 1 cm.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The physical properties of the following examples and comparative examples were measured as follows.

(Specification of turret)

KS T 1071 (Fabric Sieve).

(Drop test)

The bag containing the contents according to KS T 1307 (nylon-covered rubber yarn) was dropped horizontally 10 times at a dropping height of 120 cm. At this time, whether or not the content was leaking was observed.

(Whether it is peeling)

In order to test the bond strength between the bag and the film, it was measured by the thermal bonding strength test in KS M 7132 (polyethylene film bag). When the film was peeled at the maximum load of 13.73N or more, N, it is indicated by x.

(Leak test)

It was measured by KS M 7132 (polyethylene film bag) water leakage test method. Water was added to about 1/3 of the length of the open pouch and left for 1 minute. Then, it was checked whether water droplets fell from the bottom of the pouch, &Quot; & cir & ", and " x "

(Measurement of thermal change)

A 1 L sized ice pack was placed in the bag, the bag was sealed, the bag was placed in a constant temperature and humidity chamber at a temperature of 40 ° C, and left for 30 minutes. After 30 minutes, the bag was taken out and the degree of thawing of the ice pack was measured. When there was little change,? Was judged as?, When? 500 ml was dissolved?

(Example 1)

The film was homopolypropylene (manufactured by Samsung Total Co., Ltd.) having a Tm of 173 ° C and thermocompression-bonded to a surface of an 8 × 8 inch base bag woven with PET having a weight average molecular weight of 30,000 by a compression roller heated at 200 ° C. . The physical properties of the manufactured bag were measured and are shown in Table 1 below.

(Example 2)

A bag was manufactured in the same manner as in Example 1, except that 0.5 part by weight of magnesium particles having an average particle diameter of 0.3 탆 was added to the film and the bag material resin, based on 100 parts by weight of each resin. The physical properties of the manufactured bag were measured and are shown in Table 1 below.

(Example 3)

Except that 0.5 part by weight of a phase transition material capsule having an average particle diameter of 0.5 占 퐉 and an inner phase transition material containing manganese nitrate hexahydrate as an internal phase transition material and zirconia as an internal phase transition material was added to each of the resin and 100 parts by weight of the resin. The bag was manufactured in the same manner. The physical properties of the manufactured bag were measured and are shown in Table 1 below.

(Example 4)

A bag was prepared in the same manner as in Example 3, except that 0.5 part by weight of magnesium particles having an average particle size of 0.3 占 퐉 was added to 100 parts by weight of each resin. The physical properties of the manufactured bag were measured and are shown in Table 1 below.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: Bag production process
101: Base roll lifting roller
102: Compression roller
103: guide roller
104a and 104b:
105a, 105b: hopper
106a, 106b: extruder
107: take-up roller
10: Pouches
20: Film
21:
22: Sewing thread

Claims (2)

a) pressing a first film having a width greater than the width of the base bag on one side of the base bag;
b) folding a surplus film formed over both ends of the base bag in the first film so that an end of the surplus film is positioned inside the base bag;
c) pressing a second film having a width smaller than the width of the base stock to the back surface of the base stock;
d) cutting the base bag having the first film and the second film attached on both sides thereof, respectively; And
and e) sewing the cut portion of the base bag. A waterproof bag manufactured by the manufacturing method of the waterproof bag of claim 1.

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