WO2003010055A1 - Sac en papier - Google Patents

Sac en papier Download PDF

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Publication number
WO2003010055A1
WO2003010055A1 PCT/KR2002/001258 KR0201258W WO03010055A1 WO 2003010055 A1 WO2003010055 A1 WO 2003010055A1 KR 0201258 W KR0201258 W KR 0201258W WO 03010055 A1 WO03010055 A1 WO 03010055A1
Authority
WO
WIPO (PCT)
Prior art keywords
sack
paper
fiber
ply
mmp
Prior art date
Application number
PCT/KR2002/001258
Other languages
English (en)
Inventor
Ku-Hwa Choi
Bong-Jin Bang
Original Assignee
Shinduck Ind. Co.,Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from KR2020010022226U external-priority patent/KR200251649Y1/ko
Priority claimed from KR2020010027327U external-priority patent/KR200254965Y1/ko
Application filed by Shinduck Ind. Co.,Ltd filed Critical Shinduck Ind. Co.,Ltd
Publication of WO2003010055A1 publication Critical patent/WO2003010055A1/fr

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00Layered products comprising a layer of paper or cardboard
    • B32B29/002Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00Layered products comprising a layer of paper or cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00Layered products comprising a layer of paper or cardboard
    • B32B29/002Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D31/00Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30Multi-ply
    • D21H27/38Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
    • B32B2250/26All layers being made of paper or paperboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00Condition, form or state of the layers or laminate
    • B32B2305/38Meshes, lattices or nets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00Animal or vegetable based
    • B32B2317/12Paper, e.g. cardboard
    • B32B2317/122Kraft paper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/40Closed containers
    • B32B2439/46Bags
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00Packaging equipment or accessories not otherwise provided for
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10Packing paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30Multi-ply
    • D21H27/32Multi-ply with materials applied between the sheets
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30Multi-ply
    • D21H27/32Multi-ply with materials applied between the sheets
    • D21H27/34Continuous materials, e.g. filaments, sheets, nets

Definitions

  • the present invention relates to a paper sack of novel constitution for packing heavyweight material, and more particularly to a paper sack of novel constitution manufactured from medium paper, dual medium paper and modified medium paper for packing cement, sugar, flour, feed, etc.
  • a conventional paper sack for packing heavyweight material such as cement, sugar, flour, feed and the like is manufactured by overlapping multiple sheets of kraft paper, processed from 100% virgin pulp or processed by mixing virgin pulp with 20% or less by weight of waste paper, into three or four-ply.
  • a special expansible paper such as Clupack (U.S.A., Clupack Inc.), composite paper or the like is used.
  • Clupack U.S.A., Clupack Inc.
  • common kraft paper is not as strong as the special paper, it is possible for a kraft paper sack to prevent breakage at the time of loading/unloading or during transportation, moisture permeation by blocking air transmission therethrough during storage, and thus deteriorating its contents therein, by constructing a three to four ply sack.
  • the Korean Utility Model Registration No. 1985-1644 discloses a sack manufactured by interposing a synthetic resin film formed with vents between plies of kraft paper and then heat-sealing them. Such a sack with vents causes deterioration of the contents therein due to moisture permeation if it is preserved for a prolonged time.
  • the Korean Utility Model Registration No. 1996-7485 discloses a sack manufactured with a paper sheet in which a polyethylene film is laminated on kraft paper. In this case, the sack lacks flexibility and thus causes more air pockets therein, and the sack is likely to be broken from impact when dropped during transportation or storage during the winter season.
  • the disclosed sacks are not practically used at present.
  • the Korean Patent Registration No. 1985-457 discloses composite paper for manufacturing sacks by applying a binder of print ink, which allows oxidative polymerization, in the form of a stripe onto the kraft paper surface such as in printing, and then is combined with another kraft paper.
  • the Korean Patent Publication No. 1999-73142 discloses a method for manufacturing a sack by interposing and attaching polyethylene fiber nets between two plies of kraft paper using a water- soluble adhesive to reinforce the sack.
  • the sack in accordance with the invention is manufactured with newly constructed medium paper.
  • medium paper has been used only for corrugated board.
  • the present invention is directed towards a sack manufactured with medium paper, dual medium paper (DMP) and modified medium paper (MMP).
  • the sack of the present invention is characterized in that the medium paper, DMP and MMP are used as the outer, intermediate and inner plies of the sack, along with common Icraft paper and B Icraft paper. That is, in a three or four-ply sack composed of outer, intermediate and inner plies, the outer ply consists of common kraft paper or MMP of the invention, the intermediate ply consists of MMP, DMP of the invention and/or common medium paper, and the inner ply is selected from either common kraft paper, B kraft paper, or DMP and MMP. In a two-ply sack composed of only outer and inner plies, the outer ply consists of common kraft paper or MMP, and the inner ply consists of DMP of the invention.
  • the dual medium paper of the invention is manufactured by overlapping two sheets of medium paper using a water-soluble binder, and the MMP of the invention is manufactured from the mixture of long-fiber pulp whose length-weighted average is about 2.4mm with short-fiber pulp whose length- weighted average is about 1.6mm, refined from waste paper in advance using a fractionator.
  • An effective amount of known paper-strengthening agent may be added to the MMP of the invention.
  • the medium paper used for the corrugated cardboard is manufactured with the short- fiber pulp of the repulped paper
  • the long-fiber pulp drafted from waste paper is used to manufacture newspaper and the like.
  • the raw pulp of medium paper is manufactured by mixing 30wt% or less of long-fiber pulp with the short-fiber pulp.
  • the common kraft paper (KP) is manufactured in accordance with a known manner with 100% virgin pulp or by mixing the virgin pulp with 50wt% or less of the long-fiber pulp.
  • the B kraft paper (BKP) is of lower quality than the common kraft paper and manufactured by mixing 10 ⁇ 50wt% of virgin pulp with 50 ⁇ 90wt% of long-fiber pulp.
  • the medium paper made from the repulped paper is essentially made of short-fiber, the paper can not be used to manufacture a sack for packing heavyweight materials that requires greater strength.
  • a sack made of medium paper there has never been found in any case a sack made of medium paper.
  • the medium paper is used instead of kraft paper for the intermediate ply of the sack, rather it is possible to manufacture a sack of better performance than that of the existing kraft paper sack due to the greater thiclcness and stiffness of the medium paper without any problem during the packing of contents, transportation and storage.
  • common kraft paper sacks may often slide or shift to one side when stacked one above another due to the formation of bulge on the central portion of the sack after packing it with heavyweight material such as cement, since the common Icraft paper sack is strong but not very rigid.
  • the sack in accordance with the present invention is of good rigidity and stiffness, it is possible to fill the sack with cement with the sack remaining in almost exact box form during air-packing, much like a brick after filling. Accordingly, it is possible to prevent sliding and shifting of the sacks to one side and also to maintain a stable state of loading, when packed with heavyweight material such as cement and stored stacked one above another.
  • the binders used for manufacturing dual medium paper(DMP) in accordance with the invention are water-soluble.
  • the DMP of the invention is for manufacturing a sack use in packing heavyweight materials, and is reinforced by attaching one sheet of medium paper with the binder applied onto another sheet of medium paper, or by inserting and attaching synthetic fiber or the like in the form of a net between the two sheets of the medium paper, so as to improve its strength.
  • the water-soluble binder is a synthetic resin adhesive composed of ethylenevinylacetate (EVA), polyvinylalcohol (PVA) and/or acryl emulsion.
  • EVA ethylenevinylacetate
  • PVA polyvinylalcohol
  • acryl emulsion acryl emulsion
  • softener, polyzol, starch and the like that serves to improve its physical properties will be added as required.
  • polypropylene (PP) or polyester (PE) fiber is preferred.
  • PP polypropylene
  • PE polyester
  • the reinforcing fiber is in the form of a net attached horizontally and vertically or obliquely.
  • the composition of a binder such as the composition of a coating binder with 70wt% of water-soluble acryl emulsion, 29wt% of EVA and lwt% of softener is applied on the upper paper with a paint roller.
  • the fiber net is put and attached on the lower paper moving on a roller, and then the lower paper is laminated with the upper paper while passing through two press rollers.
  • the binder may also be applied on the upper paper only so as to be attached with the lower paper without any fiber net.
  • the attached DMP is dried while passing through four to six heat rollers and finally wound on a winding roller.
  • the water-soluble binder requires a plurality of drying rollers due to low drying rate.
  • the MMP in accordance with the invention is manufactured from raw pulp of 0 to 70wt%, preferably 40 to 65wt% of short-fiber pulp with 30 to 100wt%, preferably 35 to 60wt% of long-fiber pulp, more preferably 20wt% or less of the virgin pulp instead of the long-fiber pulp.
  • the medium paper for example, the one made by adding over 70wt% of short-fiber pulp to the long-fiber pulp, is also used along with the Icraft paper, the DMP or MMP of the invention, and thereby constitutes one component of the sack in accordance with the invention.
  • the medium paper is entirely used to manufacture the sack, breakage might occur in the sack due to its lower strength. Accordingly, it is necessary to use the kraft paper, and the DMP or MMP of the invention for the outer and inner plies.
  • the loss of strength of common medium paper can be complemented if l ⁇ 2wt% of paper-strengthening agent is added to the raw pulp when making the medium paper, it is not possible to manufacture a sack for packing heavyweight material with the medium paper only in any case.
  • the thickness is represented as weight per unit area with respect to raw pulp.
  • the weight per unit area is about 90 ⁇ 120g/m 2
  • the tensile strength (KS M7014) is about 7.1-7.5 kgf/15mm and 3.6-4.0 kgf 15mm in longitudinal and transverse directions, respectively
  • disruptive strength (KS M7016) is in the range of 100 ⁇ 120g and 110 ⁇ 124g in longitudinal and transverse directions, respectively, when measured at 20+2 °C in temperature and 65+2% relative humidity.
  • the paper-strengthening agent generally used in the paper industry can also be used in the present invention, for example, the paper-strengthening agent of epoxy resin ⁇ KYMEN 5571 (trademark, Korea Hercules), FINEX-737 (trademark, Taekwang Chemical), TOREZ P-1012 (trademark, Kukdo Chemical), S-6181 (trademark, LyGio Korea), EPOMJNE-WS (trademark, Woojin Industry) ⁇ , or the paper-strengthening agent of quaternary ammonium compound ⁇ Coltide CQS (trade name, USA CRODA INC.) ⁇ , etc.
  • epoxy resin ⁇ KYMEN 5571 (trademark, Korea Hercules), FINEX-737 (trademark, Taekwang Chemical), TOREZ P-1012 (trademark, Kukdo Chemical), S-6181 (trademark, LyGio Korea), EPOMJNE-WS (trademark, Woojin Industry) ⁇
  • the invention is characterized by a sack manufactured using common medium paper and the modified medium paper, care should be taken when selecting such paper to use as a component of the sack. That is, the common medium paper cannot be used as the outer or the inner ply for the sack. However, it is possible for it to be used as the intermediate ply for the sack only when used along with common kraft paper, B kraft paper, DMP or MMP of outer and inner plies. For example, when the common Icraft paper is used as the outer ply and the MMP is used as the inner ply for the sack, one or two sheets of common medium paper can be used as the intermediate ply for the sack.
  • the DMP of the invention cannot be used as the outer ply for the sack due to its rough surface and two sheets of DMP cannot be used at once due to its thickness. It is possible to use only one sheet of DMP serving both as an intermediate ply and an inner ply due to its rigidity and stiffness for the two-ply sack.
  • the sack in accordance with the invention can be manufactured in various types, for example, sewing type, adhesive type, pinch bag type, easy-open type, pasted valve bag type and so on, depending on the purpose of use.
  • sewing type sack for cement another important factor is a sewing process to seal the top and bottom openings of the sack.
  • the most advantageous results are obtained by the method of sewing to assist the air to be smoothly discharged, in which No. 25 or 26 needles are employed, 37 to 39 stitches are applied and No. 6 to 15 of twisted cotton thread is used.
  • cement is filled into a sack together with the air at the pressure of 7kg/cn .
  • the air is discharged through the stitch holes. If the stitch holes are too smooth without any nap, the cement dust is discharged to the outside together with the air and thus pollutes the sack surface and the air in the working environment.
  • the stitch holes are basically smooth and low in air resistance for the kraft paper, it is not easy to prevent cement dust from being discharged. Therefore it raises dust or creates air pockets during packing, which in turn causes underweight or breakage of the sack or the deterioration of its contents therein. Since the temperature of the inside of the sack is around 70 ° C when the cement from the silo is added to the sack, some air exists within the sack such as in the form of air pockets and the like, a large temperature gap between the inside and the outside of the sack may cause vapor condensation. It can be one of the reasons that the cement hardens in the sack.
  • a unique effect of the sack in accordance with the invention is that the sack makes it possible to significantly reduce the amount of raised cement dust compared with the 4-ply kraft paper sack.
  • the present invention can also reduce loss of products by preventing cement hardening during prolonged storage. That is, the medium paper according to the invention is composed of short fiber and has greater thickness, thereby creating a nap around the stitches that serves as a filter, so that the nap allows air to easily pass through but not the cement powder.
  • the angled shape of the medium paper sack creates a vortex in the sack when the air is discharged to the outside, which helps the cement powder to die down so as to reduce the amount of raised dust.
  • the sliding of the stacked sack can be prevented, and safety can be secured with the reduction of accidents.
  • FIG. 1 is a front-sectional view of a conventional 4-ply kraft paper sack
  • FIG. 2 is a cross-sectional view of a laminated structure of the dual medium paper of the example 1 according to the present invention
  • FIG. 3 is a cross-sectional view of a laminated structure of the dual medium paper of the example 2 according to the present invention
  • FIG. 4 is a front-sectional view of the structure of a 2-ply sack of the example 3 according to the present invention.
  • FIG. 5 is a cross-sectional view of the sack shown in Fig. 4;
  • FIG. 6 is a front-sectional view of the structure of a 3 -ply sack of the example 4 according to the present invention.
  • FIG. 7 is a cross-sectional view of the sack shown in Fig. 6;
  • FIG. 8 is a front-sectional view of the structure of a 4-ply sack of the example 5 according to the present invention.
  • FIG. 9 is a cross-sectional view of the sack shown in Fig. 8.
  • FIG. 10 is a front-sectional view of the structure of a 3 -ply sack of the example 6 according to the present invention.
  • FIG. 11 is a cross-sectional view of the sack shown in Fig. 10;
  • FIG. 12 is a front-sectional view of the structure of a 3-ply sack of the example 7 according to the present invention.
  • FIG. 13 is a cross-sectional view of the sack shown in Fig. 12;
  • FIG. 14 is a front-sectional view of the structure of a 4-ply sack of the example 8 according to the present invention.
  • FIG. 15 is a cross-sectional view of the sack shown in Fig. 14.
  • FIG. 16 is a front-sectional view of the structure of a 3-ply sack of the example 9 according to the present invention.
  • FIG. 17 is a cross-sectional view of the sack shown in Fig. 16;
  • Fig. 18 is a front-sectional view of the structure of a 4-ply sack of the example 10 according to the present invention.
  • Fig. 19 is a cross-sectional view of the sack shown in Fig. 18.
  • MMP modified medium paper
  • Fig. 1 is a front-sectional view to illustrate the structure of a conventional 4-ply kraft paper sack, in which structure four plies of common kraft paper 3 a are overlapped to construct a sack.
  • Fig. 2 is an embodiment to illustrate a laminated structure of the dual medium paper in accordance with the invention, showing the structure of DMP 20 configured by stacking a medium paper layer 2a, a binder layer 2b, a synthetic resin thread layer 2c, a binder layer 2d and a medium paper layer 2e one after another.
  • the composition of the binder is of 70wt% of water-soluble acryl emulsion, 29wt% of EVA and lwt% of softener.
  • Fig. 3 is an embodiment to illustrate another structure of the dual medium paper in accordance with the invention, showing the structure of the DMP configured by stacking a medium paper layer 2a, a binder layer 2b and a medium paper layer 2e one after another.
  • the binder is of the same composition as that of the example 1.
  • Figs. 4 and 5 illustrate an embodiment of a two-ply sack in accordance with the invention, which is composed of one sheet of common kraft paper for the outer ply 3 a, one sheet of dual medium paper in accordance with the example 1 for both intermediate and inner plies 20.
  • Figs. 6 and 7 are an embodiment to illustrate a three-ply sack in accordance with the invention, which is composed of one sheet of common kraft paper for the outer ply 3 a, one sheet of dual medium paper in accordance with the example 2 for the intermediate ply 21, and one sheet of the B kraft for the inner ply 3b.
  • Fig. 8 is a front-sectional view to illustrate an embodiment of a four-ply sack in accordance with the invention
  • Fig. 9 is a cross-sectional view of the sack shown in Fig. 8, depicting the sack composed of one sheet of common kraft paper for the outer ply 13 a, two sheets of common medium paper for the intermediate ply 12a and one sheet of MMP for the inner ply 12b.
  • the inner ply 12b in the present example is manufactured with the MMP by mixing 60wt% of long-fiber pulp with 40wt% of short-fiber pulp.
  • FIG. 10 is a front-sectional view to illustrate another embodiment of a three-ply sack in accordance with the invention
  • Fig. 11 is a cross-sectional view of the sack shown in Fig. 10, depicting the sack composed of one sheet of common I ⁇ aft paper for the outer ply 13 a, one sheet of medium paper containing paper-strengthening agent for the intermediate ply 12c and one sheet of B kraft paper for the inner ply 13b.
  • the intermediate ply 12c in this example is the medium paper containing paper-strengthening agent manufactured by mixing 20wt% of long-fiber pulp with 78wt% of short-fiber pulp and 2wt% of paper-strengthening agent of epoxy resin.
  • Fig. 12 is a front-sectional view to illustrate yet another embodiment of a three-ply sack in accordance with the invention
  • Fig.13 is a cross-sectional view of the sack shown in Fig.12, depicting the sack composed of one sheet of common kraft paper for the outer ply 13 a, one sheet of common medium paper for the intermediate ply 12a and one sheet of common kraft paper for the inner ply 13 a.
  • Fig. 14 is a front-sectional view to illustrate another embodiment of a four-ply sack in accordance with the invention
  • Fig.15 is a cross-sectional view of the sack shown in Fig. 14, depicting the sack composed of one sheet of MMP for the outer ply 12d, two plies of common medium paper for the intermediate ply 12a and one sheet of MMP for the inner ply 12e.
  • the outer ply 12d in this example is the MMP manufactured by mixing 80wt% of long-fiber pulp with 20wt% of virgin pulp
  • the inner ply 12e is the MMP + containing paper-strengthening agent manufactured by mixing 30wt% of long-fiber pulp with 69wt% of short-fiber pulp and lwt% of paper- strengthening agent of epoxy resin.
  • Fig.16 is a front-sectional view to illustrate still another embodiment of a three-ply sack in accordance with the invention
  • Fig. 17 is a cross-sectional view of the sack shown in Fig.16, depicting the sack composed entirely of MMP for all of outer, intermediate and inner plies 12f, 12f and 12f.
  • the MMP of the present example is manufactured from 100wt% of long-fiber pulp.
  • Fig. 18 is a front-sectional view to illustrate yet another embodiment of a four-ply sack in accordance with the invention
  • Fig.19 is a cross-sectional view of the sack shown in Fig.18, depicting the sack composed of one sheet of common kraft paper for the outer ply 13 a, two sheets of MMP for the intermediate ply 12b and one sheet of common kraft paper for the inner ply
  • the intermediate ply 12b in the present example is manufactured with the MMP by mixing
  • the following table 1 shows the percentage of sack breakage that occurred in the conventional four-ply kraft paper sack and the sacks in accordance with the invention, in loading and unloading of respective sacks.
  • the percentage of sack breakage is the rate in which sack breakage occurs from the time of packing of the corresponding material to the time of loading/unloading to/off the freight vehicle.
  • the percentage of sack breakage was measured and averaged for 1,325 sacks that were loaded into one freight car and for 600 sacks that were loaded into one freight truck.
  • the sack in accordance with the invention improves the percentage of sack breakage, compared with the conventional four-ply kraft paper sack (comparative example 1).
  • the common medium paper has lower strength than that of the kraft paper
  • the modified medium paper of greater thickness and high strength in accordance with the invention results in better stiffness and rigidity, which in turn creates a synergistic effect in reducing the percentage of sack breakage when the sack is used for packing heavyweight material.
  • the sack in accordance with the invention is better than the conventional kraft paper sacks with respect to physical properties, thereby ensuring easy discharge of air out of the sack and filling of cement into the sack, during the packing of the cement. As a result, dust and air pockets would be significantly reduced, thereby improving the stability of loading and reducing sack breakage.
  • the sack in accordance with the present invention has the effect of improving from working environment, productivity, and recycling of resources to cost saving along with the prevention of the deterioration of the contents therein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Bag Frames (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un sac en papier d'un genre nouveau, servant à emballer des matériaux lourds, produit à l'aide de papier à deux supports (DMP) ou de papier à support modifié (MMP), fabriqué par insertion de fibres synthétiques et similaires entre deux feuilles intermédiaires de papier, sous forme de filets, puis par collage desdites fibres avec un liant soluble dans l'eau. Le sac destiné à emballer des matériaux lourds comprend une feuille de papier kraft pour la feuille extérieure, une ou deux feuilles intermédiaires de papier sélectionnées dans le groupe composé du papier support, du DMP et du MMP pour la feuille intermédiaire et une feuille de papier sélectionné dans le groupe composé du DMP, du MMP, du BKP et du papier kraft pour la feuille intermédiaire intérieure.
PCT/KR2002/001258 2001-07-23 2002-07-03 Sac en papier WO2003010055A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR2020010022226U KR200251649Y1 (ko) 2001-07-23 2001-07-23 포대제조용 합지 및 합지포대
KR2001-22226U 2001-07-23
KR2020010027327U KR200254965Y1 (ko) 2001-09-06 2001-09-06 중포장용 지대
KR2001-27327U 2001-09-06

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WO2003010055A1 true WO2003010055A1 (fr) 2003-02-06

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PCT/KR2002/001258 WO2003010055A1 (fr) 2001-07-23 2002-07-03 Sac en papier

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EP1818451A1 (fr) * 2006-02-08 2007-08-15 Mondi Packaging Frantschach GmbH Papier d'emballage et sac en papier préparé à base de ce papier et procédé de fabrication de ce papier d'emballage
WO2011000942A1 (fr) * 2009-07-03 2011-01-06 Billerud Ab Papier à sac avec barrière de vapeur
EP2447060A1 (fr) * 2010-11-02 2012-05-02 SACART S.p.a. Sac fabriqué en matériau composite et son procédé de fabrication
US9527260B2 (en) 2012-01-26 2016-12-27 Dow Global Technologies Llc Sack paper with vapour barrier
EP3184694A1 (fr) * 2015-12-21 2017-06-28 BillerudKorsnäs AB Sac en papier étanche à la pluie

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CN100460289C (zh) * 2005-08-25 2009-02-11 泓齐科技有限公司 一种木质容器的制造方法
DE102010016864B4 (de) * 2010-05-10 2018-09-27 Papierfabrik Julius Schulte Söhne GmbH & Co. KG Faserstoffhaltiges Kernpapier, Verfahren zu dessen Herstellung und dessen Verwendung
CN103373015B (zh) * 2012-04-28 2017-09-15 上海杰事杰新材料(集团)股份有限公司 一种麦秆/pp织物层压轻质复合板材及其制备方法
CN104369964A (zh) * 2014-11-13 2015-02-25 常熟市梅李镇香园稻米专业合作社 韧性强的大米麻袋
CN107174154A (zh) * 2017-06-07 2017-09-19 合肥励仙电力工程有限公司 一种冲散型湿厕纸及其制造方法
CN108532370A (zh) * 2018-04-04 2018-09-14 东莞顺裕纸业有限公司 一种高强度牛皮纸及其制备方法

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JP3037009U (ja) * 1996-10-18 1997-05-06 トチセン化成工業株式会社 微粉末包装用袋材
JPH11171200A (ja) * 1997-12-15 1999-06-29 Etsuo Kobayashi 収穫物等の保管収納用具

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US4521910A (en) * 1984-04-19 1985-06-04 St. Regis Corporation Multiwall cooler bag
JP3037009U (ja) * 1996-10-18 1997-05-06 トチセン化成工業株式会社 微粉末包装用袋材
JPH11171200A (ja) * 1997-12-15 1999-06-29 Etsuo Kobayashi 収穫物等の保管収納用具

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818451A1 (fr) * 2006-02-08 2007-08-15 Mondi Packaging Frantschach GmbH Papier d'emballage et sac en papier préparé à base de ce papier et procédé de fabrication de ce papier d'emballage
WO2011000942A1 (fr) * 2009-07-03 2011-01-06 Billerud Ab Papier à sac avec barrière de vapeur
US8603597B2 (en) 2009-07-03 2013-12-10 Dow Global Technologies, Llc. Sack paper with vapour barrier
EP2447060A1 (fr) * 2010-11-02 2012-05-02 SACART S.p.a. Sac fabriqué en matériau composite et son procédé de fabrication
ITAN20100188A1 (it) * 2010-11-02 2012-05-03 Fiorini Ind Packaging Srl Sacco in materiale composito e metodo per la sua fabbricazione
WO2012059946A1 (fr) * 2010-11-02 2012-05-10 Sacart S.P.A Sac réalisé en un matériau composite et procédé pour sa fabrication
US9527260B2 (en) 2012-01-26 2016-12-27 Dow Global Technologies Llc Sack paper with vapour barrier
EP3184694A1 (fr) * 2015-12-21 2017-06-28 BillerudKorsnäs AB Sac en papier étanche à la pluie
WO2017108910A1 (fr) * 2015-12-21 2017-06-29 Billerudkorsnäs Ab Sac en papier imperméable

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CN1535232A (zh) 2004-10-06

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