CN1258467C - Paper sack - Google Patents

Paper sack Download PDF

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Publication number
CN1258467C
CN1258467C CNB028148363A CN02814836A CN1258467C CN 1258467 C CN1258467 C CN 1258467C CN B028148363 A CNB028148363 A CN B028148363A CN 02814836 A CN02814836 A CN 02814836A CN 1258467 C CN1258467 C CN 1258467C
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CN
China
Prior art keywords
paper
paper bag
type
sack
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB028148363A
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Chinese (zh)
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CN1535232A (en
Inventor
崔久和
方奉镇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHINDUCK IND CO Ltd
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SHINDUCK IND CO Ltd
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Filing date
Publication date
Priority claimed from KR2020010022226U external-priority patent/KR200251649Y1/en
Priority claimed from KR2020010027327U external-priority patent/KR200254965Y1/en
Application filed by SHINDUCK IND CO Ltd filed Critical SHINDUCK IND CO Ltd
Publication of CN1535232A publication Critical patent/CN1535232A/en
Application granted granted Critical
Publication of CN1258467C publication Critical patent/CN1258467C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered 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
    • B32B29/005—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/26—All layers being made of paper or paperboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/38—Meshes, lattices or nets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B32B2317/122—Kraft paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/32—Multi-ply with materials applied between the sheets
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/32—Multi-ply with materials applied between the sheets
    • D21H27/34—Continuous materials, e.g. filaments, sheets, nets

Abstract

A paper sack of novel constitution for packing heavyweight materials is manufactured with the dual medium paper (DMP) or modified medium paper (MMP) manufactured by inserting synthetic fiber and the like between two plies of medium paper in the form of nets, and then pasting them with a water-soluble binder. The sack for packing heavyweight materials is composed of one sheet of kraft paper for the outer ply, one or two plies of paper selected from the group consisting of medium paper, DMP and MMP for the intermediate ply, and one sheet of paper selected from the group consisting of DMP, MMP, BKP and kraft paper for the inner ply.

Description

Paper bag
Technical field
The present invention relates to be used to pack the paper bag of the new structure of big weight of material, relate in particular to the paper bag of packing the new structure of cement, sugar, flour, feed etc. by core paper (medium paper), twin-core paper and improved core paper being used to of making.
Background technology
The traditional paper bag that is used to pack heavy weight material such as cement, sugar, flour, feed etc. is to make in three or four layers the mode that forms paper bag by overlapping many craft papeies, described craft paper be by 100% former paper pulp processing or with former paper pulp with 20% or still less the waste paper of weight mix and process.For making double-deck paper bag, use special expansible paper, Clupack (U.S. Clupack company) for example, extrusion coating paper or other similar paper.Although common craft paper is good not as special paper intensity, however kraft paper bag may prevent from by the sack that is constructed to three to four layers in loading and unloading or transportation, to break, in storage by stop air by and moistureproof, prevent that thus its content from degenerating.
One of shortcoming of common paper bag is that it is difficult to mate with the air pressure of supply ventilating fan and the feed rate of content in packaging process.In some cases, air is not discharged smoothly from paper bag, produces dust and/or air pocket thus in paper bag, described dust and/or air pocket then cause packing to give short measure or bag breakage.Especially, if air remains in the sack since with the temperature of cement cement when vat is packed into the sack greatly about 70 ℃ because the inside and outside temperature difference of sack, the phenomenon of condensation vapor can take place.Such condensation vapor is one of reason of cement hardening.
For addressing these problems, it is a kind of by insert the sack that the film of synthetic resin that has breather port is made the method for its heat-sealing then between the layer of craft paper that registration number is that the Korean Utility Model of 1985-1644 has disclosed.If such sack long storage time can degenerate content owing to saturating wetting.For addressing this problem, registration number is that the Korean Utility Model of 1996-7485 has disclosed a kind of paper bag, and wherein polyethylene foil is laminated on the craft paper.In this example, this sack lacks flexibility, and the result causes inside that more air pocket is arranged, and when in transit by drop or when storing in the winter time, described sack is easy to break because of collision.Therefore, the above-mentioned sack that discloses is unactual at present uses.What is worse, in the prior art, with paper and film separately be difficulty thereby paper bag can not recycle, and the noxious gas that produces when the film refuse is processed causes environmental pollution, described noxious gas is difficult to degrade biologically.
Registration number is that the Korean Patent of 1985-457 has disclosed the extrusion coating paper that is used to make sack, make in the method for sack at it, use the seal China ink adhesives that allows oxidative polymerization, print black adhesives and be formed on the craft paper surface with the form of band, such as being printed on the craft paper surface, combine with another craft paper then.It is a kind of by utilizing water-soluble binder to insert in the middle of two-layer craft paper and the sticking polyethylene fleece is made the method for sack to reinforce sack that publication number is that the Korean Patent of 1999-73142 has disclosed.
Although these prior aries improve to some extent compared with technology more early, it still has problems, such as because bottom the sack and the low bag breakage that causes of intensity of the suture at top.Especially, air is discharged unsatisfactorily when cement is put into sack, the inner air pocket that forms of sack then cause underweight.Further, the air that retains in the sack makes its content degenerate (for example hardening of cement) bag breakage.Thus, these sacks are because these shortcomings can not become the substitute of the sack of making according to the previous patent that discloses.
Summary of the invention
One of purpose of the present invention is to provide a kind of novel sack that is used to pack big weight of material.
Another object of the present invention is to provide a kind of sack that is used to pack big weight of material that utilizes core paper to make, described core paper only was used to corrugated board originally, and described sack makes that breaking through the restriction of core paper aspect recycling becomes possibility.
The present invention also has a purpose to be to provide a kind of sack that is used to pack big weight of material, and described sack is the same with kraft paper bag good even be better than kraft paper bag cargo-carring aspect stable at aspect of performance.
The present invention also has a purpose to be to provide a kind of sack of being made by core paper, and described sack can reduce faulty goods, and for example the product of underweight reaches and reduce environmental pollution, for example dust when the powder product of packing as cement.
The present invention also has a purpose to be to provide a kind of sack of being made by core paper that is used to pack big weight of material, because the low-moisture permeability of sack, and the content in the sack even under long-time situation of preserving, also be difficult for degenerating.
The present invention also has a purpose to be to provide a kind of sack of being made by core paper, and described sack has low damaged risk or few environmental pollution in transportation, unloading and storing process.
The present invention also has a purpose to be to provide a kind of use to be the sack that rigidity and rigid novel core paper are made when making sack, and described sack can prevent to slide when piling up, and the slip during this accumulation is the feature of the paper bag made of common craft paper.
For reaching above-mentioned purpose of the present invention, make with novel core paper according to sack of the present invention.Up to the present, core paper also only is used to make corrugated board.
Target of the present invention is the sack of making of core paper, double-deck core paper (DMP) and improved core paper (MMP).To be core paper, DMP and MMP be used as outer, the centre and the internal layer of paper bag with common craft paper and B craft paper to the feature of sack of the present invention.Promptly, by three or four layers of paper bag that skin, interlayer and internal layer are formed, skin is made up of common craft paper or MMP of the present invention, and interlayer is made up of MMP of the present invention, DMP and/or common core paper, internal layer or select from common craft paper, B craft paper is perhaps selected from DMP and MMP.In the two-layer paper bag of only being made up of outer and internal layer, skin is made up of common craft paper or MMP, and internal layer is made up of DMP of the present invention.
Twin-core paper of the present invention is by making of overlapping two core papers of water-soluble binder, MMP of the present invention, is refined from waste paper with fractionator for the long fibered pulp of 2.4mm and length-weighted average are that the chopped fiber paper pulp of 1.6mm mixes and makes in advance by length-weighted average (length-weighted average).The known paper intensity reinforcing agent of effective dose can be added on MMP of the present invention.
The core paper that is used for corrugated board is with the chopped fiber paper pulp manufacturing of recycled writing paper, the long fibered pulp that refines from waste paper be used to frame news paper and similar paper.
In the present invention, the former paper pulp of core paper is made by 30wt% or long fibered pulp are still less mixed with chopped fiber paper pulp.Common craft paper (KP) is made according to known manner, and known manner is promptly mixed with 50wt% or long fibered pulp still less with 100% former paper pulp or with former paper pulp.At last, B craft paper (BKP) mixes with the long fibered pulp of 50～90wt% by the former paper pulp with 10～50wt% to be made, and its quality is lower than common craft paper.
Be known that core paper can not be used to make the high-intensity sack that requires that is used for packing big weight of material owing to come down to make with chopped fiber with the core paper of recycled writing paper manufacturing.Also do not find the example of useful core paper manufacturing sack.Yet, and think unlike some people, if core paper is used to the interlayer that replaces craft paper to make sack then because its intensity is low breaking of sack may be taken place, be bigger thickness and intensity on the contrary, thereby can make the sack that in packing content thing, transportation and storing process, has better performance compared with existing kraft paper bag without any problem ground owing to core paper.For example; in the time of one pile one; because the central part at sack can form jut having packed big weight of material such as cement after, common kraft paper bag can often slide or move on to one side, though because common kraft paper bag firm be not unusual rigidity.
But, owing to have good rigidity according to sack of the present invention, with the cement filling bag period of the day from 11 p.m. to 1 a.m, the almost ideal box-shape when sack can remain on empty package, after filling the spitting image of a fragment of brick.Thus, when bag packaging big weight of material such as cement and one pile one ground when storing, can prevent sliding stop and move on to one side, and can keep stable loading condition.
The adhesives that is used to make twin-core paper (DMP) according to the present invention is water miscible.DMP of the present invention is used to make the sack of the big weight of material of packing, by using adhesives that a core paper is pasted on another core paper, or strengthen by the net that between two core papers, inserts and paste the material of plastic wire or similar syntheticfibres, to improve its intensity.
In the present invention, water-soluble binder is a synthetic resin adhesive, is made up of ethylene vinyl acetate (EVA), polyvinyl alcohol (PVA) and/or acryloyl emulsion.And for improving its physical property, soften flux, polyzol, starch and analogue can add on request.
Concerning enhancing fiber of the present invention, mainly use polypropylene (PP) or polyester (PE) fiber, but also can use straw fiber or paper fiber.The parallel of enhancing property fiber and the space between the warp be 5mm to 30mm, it can suitably be adjusted according to the needs that manufacture a product.In this sack, enhancing property fiber is with the form on even keel of net and vertically or on the bias is stuck.
For making according to twin-core paper of the present invention, paint the composite of roller with adhesives, for example use the binders for coatings composite of the soften flux of the EVA of water soluble propene's acyl emulsion, 29wt% of 70wt% (percentage by weight) and 1wt% to be applicable on the upper paper.Fleece is placed and is pasted on the lower floor's paper that moves on the roller, and lower floor's paper is being laminated on by two compression roller period of the day from 11 p.m. to 1 a.m with upper paper then.Adhesives also can only be used on the upper paper, so that upper paper and lower floor's paper are pasted together under without any fibroreticulate situation.Next, the DMP that has pasted is dried in the process by four to six heated rollers, finally is wrapped in to twine on the roller.
According to MMP of the present invention is by 0 to 70wt% former paper pulp, preferred 40 to 65wt% chopped fiber paper pulp, make to the long fibered pulps of 100wt%, preferred 35 to 60wt% long fibered pulp with 30, more preferably replace long fibered pulp with 20wt% or former paper pulp still less.
Core paper for example, surpasses by adding to long fibered pulp that 70% chopped fiber paper pulp makes, and also uses with craft paper, DMP or MMP of the present invention, therefore also becomes the component part according to sack of the present invention.
Yet if entirely make sack with core paper, because the intensity of core paper is low, breakage may take place in sack.Thus, be necessary to use craft paper and DMP of the present invention, MMP as skin and nexine.Although the disappearance of the intensity of common craft paper can compensate by when making core paper the paper intensity reinforcing agent of 1～2wt% being added on former paper pulp, in any case only the sack of packing big weight of material with the core paper manufacturing is impossible.
Usually, concerning wrapper, its thickness is represented with the weight with respect to the unit area of former paper pulp.Concerning MMP of the present invention, when being that 20 ± 2 ℃ and relative humidity are when measuring under 65 ± 2% the condition in temperature, the weight of unit area approximately is 90～120g/m 2, tensile strength (KSM7014) is approximately 7.1～7.5kgf (kgf)/15mm and 3.6～4.0kgf/15mm respectively on vertical and horizontal, and resistanee to rupture (KS M7016) is respectively 100～120g and 110～124g on vertical and horizontal.
The paper intensity reinforcing agent that is generally used for paper industry also can be used for the present invention, for example, epoxy resin paper intensity reinforcing agent { KYMEN 5571 (trade marks, Korea Hercules (Korea S Hercules company)), FINEX-737 (trade mark, Taekwang Chemical (Taekwang chemical company)), TOREZ P-1012 (trade mark, Kukdo Chemical (Kukdo chemical company)), S-6181 (trade mark, LyGio Korea (LyGio Korean company)), EPOMINE-WS (trade mark, Woojin Industry (Woojin industry)) }, paper intensity reinforcing agent of quaternary ammonium compound { Coltide CQS (trading company, USA CRODA INC. (U.S. CRODA company)) } etc.
Although characteristics of the present invention are to use common core paper and improved core paper to make sack, care should be used to still when such paper of selecting as the component part of sack.That is, common core paper can not be as the skin and the internal layer of sack.But only when when common craft paper, B craft paper, DMP or MMP are used as skin and internal layer, common core paper can be used as the interlayer of sack.For example, when common craft paper as the skin of sack and MMP during as the internal layer of sack, one or two common craft paper can be used as the interlayer of sack.DMP of the present invention can not be used as the skin of sack owing to its rough surface, two DMP are because its thickness can not be as the skin of sack simultaneously.Because rigidity and the hardness of DMP can be only with interlayer and the internal layer of a DMP as two-layer sack.
Can be according to sack of the present invention according to all kinds manufacturing, for example, stitched type, adhesion type is mediated the sack type, easily opens sack type or the like, decides according to application target.
Be used for the process of the stitched type sack of cement in manufacturing, another key factor is the sewing process of the opening of the top of envelope and bottom.According to the present invention, by obtaining best result, use 25 or No. 26 pins in this method to sew up the steady method of discharging of additional air, be suitable for 37 to 39 stitch, use two cotton threads 6 to No. 15.
Usually, cement and pressure are 7kg/cm 2Air be filled in the sack together.At this moment, air is discharged from by the stitch hole.Do not have fine, soft fur, cement dust to be discharged to the outside with air if the stitch hole is too level and smooth, the result can pollute the air of sack surface and working environment.
Because the stitch hole is level and smooth basically concerning craft paper, be low to the resistance of air, prevent that it is very difficult that cement dust is discharged from.Therefore it produces dust or air pocket in packaging process, this so that cause the breakage of underweight or sack or the content of sack to degenerate again.Owing to when cement temperature the sack when packing sack into from vat is approximately 70 ℃, have some air in sack, for example with the form or the similar form of air pocket, the temperature difference between sack is inside and outside can cause condensation vapor.This can be one of reason of hardening of cement in the sack.
Effect according to the uniqueness of sack of the present invention is that described sack is compared the quantity that can significantly reduce the cement dust of generation with 4 layers of craft paper sack.The present invention also can reduce product losses by preventing the sclerosis of cement in long-time storage.That is, form by chopped fiber and bigger thickness arranged, around stitch, produced fine, soft fur thus as filter according to core paper of the present invention, described fine, soft fur allow air smoothly by and do not allow finished ground cement to pass through smoothly.In addition, because the shape at the one-tenth angle of core paper bag produces whirlpool in bag when air is discharged to the outside, thereby can help finished ground cement to stop to reduce the quantity of the dust of kicking up gradually like this.Further, can prevent the slip of the sack piled up, the minimizing accident guarantees safety.
Brief Description Of Drawings
These and other features of the present invention, aspect and advantage will be by following explanation, appended claim and accompanying drawings and easy to understand.In the accompanying drawings, viewgraph of cross-section is made along the x wire of the central part of sack, and wherein label is indicated from most external to each the most inboard part.
Fig. 1 is the front sectional elevation of four layers of kraft paper bag of tradition;
Fig. 2 is the viewgraph of cross-section according to the stepped construction of the twin-core paper of embodiments of the invention 1;
Fig. 3 is the viewgraph of cross-section according to the stepped construction of the twin-core paper of embodiments of the invention 2;
Fig. 4 is the front sectional elevation according to the structure of two layers of sack of embodiments of the invention 3;
Fig. 5 is the viewgraph of cross-section of sack shown in Figure 4;
Fig. 6 is the front sectional elevation according to the structure of three layers of sack of embodiments of the invention 4;
Fig. 7 is the viewgraph of cross-section of sack shown in Figure 6;
Fig. 8 is the front sectional elevation according to the structure of four layers of sack of embodiments of the invention 5;
Fig. 9 is the viewgraph of cross-section of sack shown in Figure 8;
Figure 10 is the front sectional elevation according to the structure of three layers of sack of embodiments of the invention 6;
Figure 11 is the viewgraph of cross-section of sack shown in Figure 10;
Figure 12 is the front sectional elevation according to the structure of three layers of sack of embodiments of the invention 7;
Figure 13 is the viewgraph of cross-section of sack shown in Figure 12;
Figure 14 is the front sectional elevation according to the structure of four layers of sack of embodiments of the invention 8;
Figure 15 is the viewgraph of cross-section of sack shown in Figure 14;
Figure 16 is the front sectional elevation according to the structure of three layers of sack of embodiments of the invention 9;
Figure 17 is the viewgraph of cross-section of sack shown in Figure 16;
Figure 18 is the front sectional elevation according to the structure of four layers of sack of embodiments of the invention 10;
Figure 19 is the viewgraph of cross-section of sack shown in Figure 180.
Preferred forms of the present invention
Describe the preferred embodiments of the present invention below with reference to accompanying drawings in detail.In an embodiment of the present invention, the manufacturing of improved core paper (MMP) is based on the manufacture method of the common core paper of tradition, and still, the blending ratio of each several part is then deferred to the present invention.
Comparative example 1 (prior art)
Fig. 1 is the front sectional elevation of the structure of four layers of kraft paper bag of explanation tradition, and wherein four layers of common craft paper 3a are stacked to constitute sack.
Embodiment 1
Fig. 2 explanation shows the structure of DMP 20 according to the laminated structure of twin-core paper of the present invention, is about to core paper layer 2a, adhesive phase 2b, synthetic resin line layer 2c, adhesive phase 2d and core paper layer 2e one deck and connects the accumulation of one deck ground.The component of adhesives is 70wt% water soluble propene acyl emulsion, the EVA of 29wt% and the soften flux of 1wt%.
Embodiment 2
Fig. 3 explanation shows the structure of DMP according to the another kind of structure of twin-core paper of the present invention, is about to core paper layer 2a, adhesive phase 2b and core paper layer 2e one deck and connects the accumulation of one deck ground.The same among the component of adhesives and the embodiment 1.
Embodiment 3
Fig. 4 and Fig. 5 explanation are according to the embodiment of double-deck paper bag of the present invention, and it is made up of a common craft paper as outer 3a, the twin-core paper as centre and internal layer 20 according to embodiment 1.
Embodiment 4
Fig. 6 and 7 is explanation embodiment according to three layers of sack of the present invention, and it is by a common craft paper as outer 3a, forming as the twin-core paper of interlayer 21 with as the B craft paper of internal layer 3b according to embodiment 2.
Embodiment 5
Fig. 8 is the front sectional elevation of explanation according to the embodiment of four layers of sack of the present invention, Fig. 9 is the viewgraph of cross-section of sack shown in Figure 8, and described sack is made up of a common craft paper as outer 13a, two common core papers and MMP as internal layer 12b as interlayer 12a.Internal layer 12b among this embodiment uses by the long fibered pulp of 60wt% and the chopped fiber paper pulp of 40wt% are mixed the MMP manufacturing that obtains.
Embodiment 6
Figure 10 is the front sectional elevation of explanation according to another embodiment of three layers of sack of the present invention, Figure 11 is the viewgraph of cross-section of sack shown in Figure 10, and described sack is made up of a common craft paper as outer 13a, a common core paper that comprises the paper intensity reinforcing agent and the B craft paper as internal layer 13b as interlayer 12c.Interlayer 12c among this embodiment is by the chopped fiber paper pulp of the long fibered pulp of 20wt% and 78wt% and the epoxy resin paper intensity reinforcing agent of 2wt% are mixed the core paper of making that comprises the paper intensity reinforcing agent.
Embodiment 7
Figure 12 is the front sectional elevation of explanation according to another embodiment of three layers of sack of the present invention, Figure 13 is the viewgraph of cross-section of sack shown in Figure 12, and described sack is made up of a common craft paper as outer 13a, a common core paper and the common craft paper as internal layer 13a as interlayer 12a.
Embodiment 8
Figure 14 is the front sectional elevation of explanation according to another embodiment of four layers of sack of the present invention, Figure 15 is the viewgraph of cross-section of sack shown in Figure 14, and described sack is made up of a MMP as outer 12d, two-layer common core paper and MMP as internal layer 12e as interlayer 12a.Outer 12d among this embodiment mixes the MMP that makes by the former paper pulp with the long fibered pulp of 80wt% and 20wt%, and internal layer 12e is the MMP that comprises the paper intensity reinforcing agent that makes by with the epoxy resin paper intensity reinforcing agent mixing of the chopped fiber paper pulp of the long fibered pulp of 30wt% and 69wt% and 1wt% +
Embodiment 9
Figure 16 is the front sectional elevation of explanation according to another embodiment of three layers of sack of the present invention, and Figure 17 is the viewgraph of cross-section of sack shown in Figure 16, and described sack is entirely by as outer, interlayer and internal layer 12f, and the MMP of 12f and 12f forms.MMP among this embodiment is by the long fibered pulp manufacturing of 100wt%.
Embodiment 10
Figure 18 is the front sectional elevation of explanation according to another embodiment of four layers of sack of the present invention, Figure 19 is the viewgraph of cross-section of sack shown in Figure 180, and described sack is made up of a common craft paper as outer 13a, two MMP and common craft papeies as internal layer 13a as interlayer 12b.Interlayer 12b among this embodiment is by the long fibered pulp of 40wt% and the chopped fiber paper pulp of 60wt% are mixed the MMP that makes.
The label 4 and 14 that also is not described in the above-mentioned example is sewing parts of sack.
Following table 1 is illustrated in four layers of kraft paper bag of tradition in the process of the various sacks of loading and unloading and according to the percentum of the generation sack breakage of sack of the present invention.The percentum of sack breakage is meant the ratio that takes place to sack breakage in the time of load-carrying vehicle loading and unloading associated materials from the time of packing corresponding material.The percentum of sack breakage is to be loaded into 1325 sacks of a joint railway carriage and to reprint 600 sacks of a truck and the result is on average obtained by measurement.
Table 1
Embodiment *Bag configuration Damaged percentum (%)
Embodiment 3 KP+DMP 0.06
Embodiment 4 KP+DMP+BKP 0.05
Embodiment 5 KP+MP+MP+MMP 0.09
Embodiment 6 KP+MP ++BKP 0.15
Embodiment 7 KP+MP+KP 0.15
Embodiment 8 MMP+MP+MP+MMP + 0.09
Embodiment 9 MMP+MMP+MMP 0.13
Embodiment 10 KP+MMP+MMP+KP 0.07
Comparative example 1 KP+KP+KP+KP 0.1
*KP: common craft paper
MP: core paper
MP +: core paper+paper intensity reinforcing agent
DMP: twin-core paper
MMP: improved core paper
MMP +: improved core paper+paper intensity reinforcing agent
The BKP:B craft paper
As appreciable, compare the percentum that has improved the paper bag breakage with four layers of kraft paper bag of tradition (comparative example 1) according to paper bag of the present invention from table 1.
With reference to The above results, although can expect that the intensity of intensity ratio craft paper of common core paper is low, have more according to of the present invention that heavy gauge and high-intensity improved core paper have better hardness and rigidity, this so that produced the enhancement effect of the percentum of the minimizing sack breakage when sack is used to pack big weight of material again.
In addition, be better than traditional kraft paper bag aspect the physical property, when packing cement, guaranteeing easier discharge sack of air and the easier sack that is filled into of cement thus according to sack of the present invention.As a result, dust and air pocket will reduce significantly, improve the breakage of cargo-carring stability and minimizing sack thus.
This can see by the following fact: because the dust in packaging process still less, working environment keeps clean, capacity rating is improved, and on average needs 2.1 seconds because 42kg cement is filled into traditional kraft paper bag, and on average only needs 1.7 seconds when being filled into according to sack of the present invention.These features of the present invention are considered to be in the result that the stitch hole forms fine, soft fur on every side.According to the observation of carrying out with microscope, fine, soft fur covers half of stitch hole usually, in case packaging operation begins, fine, soft fur just allows air to pass through by stoping cement dust as filter.
As mentioned above, have to use according to sack of the present invention and save cost and prevent the effect that content degenerates from improvement environment, capacity rating and resource circulation.
The present invention is described in detail.Yet, should be appreciated that above-mentioned detailed description that has shown the preferred embodiments of the present invention and specific embodiment only are that mode with explanation provides, describe in detail thus, various changes and modifications within the spirit and scope of the present invention are apparent to those skilled in the art.

Claims (16)

1. one kind three to four layers paper bag, has skin, interlayer and internal layer, it is characterized in that, described skin and described internal layer are craft papeies, described interlayer is made of one or two core papers, and described core paper is that 0 to 70wt% chopped fiber paper pulp and 30 to 100wt% long fibered pulp are made by the total amount with respect to described former paper pulp.
2. paper bag as claimed in claim 1 is characterized in that, described core paper is that 0 to 40wt% chopped fiber paper pulp and 60 to 100wt% long fibered pulp are made by the total amount with respect to described former paper pulp.
3. paper bag as claimed in claim 2 is characterized in that described core paper is made by the long fibered pulp of 100wt%.
4. as the described paper bag of one of claim 1-3, it is characterized in that described core paper further comprises the epoxy resin of 1～2wt% or the paper intensity reinforcing agent that quaternary ammonium compound constitutes.
5. as the described paper bag of one of claim 1-3, it is characterized in that described core paper is that 20 ± 2 ℃ and relative humidity are when measuring under 65 ± 2% the condition in temperature, has 90～120g/m 2The weight of per unit area, the machine direction tensile strength of 7.1～7.5kgf/15mm and the cross direction tensile strength of 3.6～4.0kgf/15mm, vertical resistanee to rupture of 100～120g and the horizontal resistanee to rupture of 110～124g.
6. paper bag as claimed in claim 4 is characterized in that, described core paper is that 20 ± 2 ℃ and relative humidity are when measuring under 65 ± 2% the condition in temperature, has 90～120g/m 2The weight of per unit area, the machine direction tensile strength of 7.1～7.5kgf/15mm and the cross direction tensile strength of 3.6～4.0kgf/15mm, vertical resistanee to rupture of 100～120g and the horizontal resistanee to rupture of 110～124g.
7. as the described paper bag of one of claim 1-3, it is characterized in that described paper bag is according to from by stitched type, adhesion type, kneading paper bag type, easily open paper bag type and paste one type of manufacturing selecting the group that valve paper bag type formed.
8. paper bag as claimed in claim 4 is characterized in that, described paper bag is according to from by stitched type, adhesion type, kneading paper bag type, easily open paper bag type and paste one type of manufacturing selecting the group that valve paper bag type formed.
9. paper bag as claimed in claim 5 is characterized in that, described paper bag is according to from by stitched type, adhesion type, kneading paper bag type, easily open paper bag type and paste one type of manufacturing selecting the group that valve paper bag type formed.
10. paper bag as claimed in claim 6 is characterized in that, described paper bag is according to from by stitched type, adhesion type, kneading paper bag type, easily open paper bag type and paste one type of manufacturing selecting the group that valve paper bag type formed.
11. one kind three to four layers paper bag, has skin, interlayer and internal layer, it is characterized in that, described skin is craft paper or improved core paper, described improved core paper is that 0 to 40wt% chopped fiber paper pulp and 60 to 100wt% long fibered pulp are made by the total amount with respect to described former paper pulp, and described interlayer is made of one or two core papers, and described internal layer is B craft paper or described improved core paper.
12. a double-ply paper bag has skin and internal layer, it is characterized in that, described skin is a craft paper, and described internal layer is by core paper is stacked and twin-core paper that form constitutes with two with water-soluble binder.
13. paper bag as claimed in claim 12 is characterized in that, described water-soluble binder is the adhesive composition of selecting from the group that ethylene vinyl acetate, polyvinyl alcohol and acryloyl emulsion are formed.
14. paper bag as claimed in claim 13 is characterized in that, described water-soluble binder layer further comprises one deck fortifying fibre, and this fortifying fibre is selected from the group that mekralon, poly-ester fibres, straw fiber and paper fiber are formed.
15., it is characterized in that described paper bag is according to from by stitched type, adhesion type, kneading paper bag type, easily open paper bag type and paste one type of manufacturing selecting the group that valve paper bag type formed as the described paper bag of one of claim 12 to 14.
16. one kind three layers paper bag has skin, interlayer and internal layer is characterized in that, described skin and internal layer are craft papeies, and described interlayer is by by constituting two bonding twin-core paper that form of core paper.
CNB028148363A 2001-07-23 2002-07-03 Paper sack Expired - Fee Related CN1258467C (en)

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KR2020010022226U KR200251649Y1 (en) 2001-07-23 2001-07-23 Combined medium paper for kraft paper bag and the bag thereof
KR200122226U 2001-07-23
KR2020010027327U KR200254965Y1 (en) 2001-09-06 2001-09-06 Combined paper bag
KR200127327U 2001-09-06

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EP2449176B1 (en) 2009-07-03 2016-09-28 Dow Global Technologies LLC Sack paper with vapour barrier
DE102010016864B4 (en) * 2010-05-10 2018-09-27 Papierfabrik Julius Schulte Söhne GmbH & Co. KG Fibrous core paper, process for its preparation and its use
IT1402440B1 (en) * 2010-11-02 2013-09-13 Fiorini Ind Packaging Srl BAG IN COMPOSITE MATERIAL AND METHOD FOR ITS MANUFACTURE
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CN103373015B (en) * 2012-04-28 2017-09-15 上海杰事杰新材料(集团)股份有限公司 A kind of straw/PP fabric laminated light composite boards and preparation method thereof
CN104369964A (en) * 2014-11-13 2015-02-25 常熟市梅李镇香园稻米专业合作社 High-tenacity rice jute bag
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