CN100338309C - Molding base paper and molded paper vessel produced from it - Google Patents
Molding base paper and molded paper vessel produced from it Download PDFInfo
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- CN100338309C CN100338309C CNB2005101126135A CN200510112613A CN100338309C CN 100338309 C CN100338309 C CN 100338309C CN B2005101126135 A CNB2005101126135 A CN B2005101126135A CN 200510112613 A CN200510112613 A CN 200510112613A CN 100338309 C CN100338309 C CN 100338309C
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Abstract
A molding base paper used for forming paper vessels such as a cup or tray for foods and various industrial products is disclosed which satisfies the following conditions (1) to (4): (1) a tensile strength (JIS-P 8113) of at least 2.0 kN/m, (2) an elongation at break (JIS-P 8113) of at least 1.5 %, (3) a critical compression stress, defined by the following formula, in the range of 1 to 10 MPa: <DF>critical compression stress = A/B </DF> wherein A represents the compression strength determined by JIS-P 8126, and B represents the area of loaded part of the test piece in the determination of the compression strength, and (4) an amount of the compression deformation, caused by applying compression stress of 20 kgf/cm<2> in thickness direction, of at least 10 %. <>The paper vessels are prepared by controlling the water content of the molding base paper at 10 to 20 % and then drawing the molding base paper at 100 to 150 DEG C.
Description
The present invention is that application number is 01141644.0, the applying date is September 29 calendar year 2001, denomination of invention is divided an application for " molding base paper and by the molded paper container of its production ".
Technical field
The present invention relates to molding base paper, it can be used as the material of the various packing containers that are used for industrial products etc.It is fresh-keeping that this container also can be used for food such as meat, vegetables and fish and various processed food such as lunch, non-staple food, frozen food, cake and noodles.Especially, the molding base paper that the present invention relates to when abandoning, only to cause the low environment burden and be particularly suitable for compression moulding.
Background technology
Plastic containers are in a large number as the packaging material of food containers or various industrial products, because their moldings easily, they can be mass-produced, and their production cost is low.
The example of widely used plastic containers is for by making polystyrene bead molding foaming or the foamed styrene container by polystyrene sheet material moulding foaming is obtained; Polypropylene containers, polyethylene terephthalate container and polyvinyl chloride container.
Yet the problem that these plastic containers exist is: when they were dropped, environment will bear heavy burden.In other words, when these plastic containers were embedded in the ground, they almost forever residued in the ground and can not decompose.In addition, when they were burned, Yin Qigao burned a calorie meeting and damages incinerator; They are not easy completing combustion, particularly when burning polyvinyl chloride, can form the hydrogen chloride gas of severe corrosive.
Under these situations, consider environmental problem, recycle and economize on resources, need replace plastic containers by only the causing the low environment burden and only have the low caloric recyclable and biodegradable container that burns of pulp preparation at present.
For only by paper pulp or mainly comprise and the three-dimensional shaped bodies of the material preparation of paper pulp used paper pulp moulded container.
Moulded paper pulp product has been widely used as packing container.The method production of moulded paper pulp product by comprising the steps: preparation has the clean mould corresponding to the concaver structure and the convex body structure of predetermined container shape, is preparing paper on this clean mould under suction and is being dried with pulp.By the method, can make the starting slurry forming materials by required form.Therefore, the container that obtains by the method has the shape that can select in suitable wide region.Yet it is consuming time and have a low problem of productivity ratio to produce this paper pulp moulded articles.
In addition, be difficult to give enough resistances to water of this type of paper pulp moulded container and oil resistivity, it is required that these performances normally are used for the pallet container of food.This technology can increase production cost.
Be to produce the mechanograph that mainly constitutes except that paper pulp moulded articles, adopt wherein the substrate that will be mainly constitutes by paper pulp such as the method for cardboard compression moulding under heating by paper pulp.
In the method, the substrate that will have line of weakness is positioned between formpiston and the former, compacting under heating then.
This compression moulding method has very high productivity ratio, because this mechanograph can obtain by a pressing operation.
Yet mainly the substrate that is made of paper pulp has bad tensile property, extensibility and the elasticity that is different from resin and metal usually.Therefore, when when obtaining to have certain depth such as 40mm or darker pallet and press deeply, this substrate can not bear this stretching and can break.
Therefore, when common cardboard or its analog during as base material, only can be produced kiver, promptly have the papery plate of depth as shallow to 20mm.Therefore, the shape of the mechanograph that obtains in the prior art is restricted.
In addition, even when container did not break, folding line became inhomogeneous at the line of weakness place, so vessel surface is not easy to polish.In case the edge from the top of pallet side wall level and the outside pallet that stretches is inhomogeneous, then when with the pallet cover upper cover or with film or the sealing of its analog, sealing can reduce.In addition, the breakdown point at the folding line place causes the pallet intensity decreases.
The method that addresses these problems has been proposed.For example, Japan Patent (being designated hereinafter simply as " JP ") spy opens flat 5-286023 and discloses a kind of method, wherein will be by providing a lot of waveform sweeps on the paper material so that its extensile corrugated paper is suppressed in mould under heating; The flat 6-134898 of TOHKEMY discloses a kind of method, wherein will have complete convex-concave surface so that its extendible paper material is wetting, compacting under heating then; The flat 7-214705 of TOHKEMY discloses a kind of method, wherein with two or more wetting body paper by adhesive lamination, and make the laminated product of acquisition wrinkling, compression moulding then.
Yet, in above-mentioned all methods, all be to make substrate wrinkling in advance and make it extensible thus, but make it have press processability like this, then with its compacting.Therefore, must carry out wrinkling step, carry out pressing step then, simultaneously wrinkle still remains in the container of compacting, so can damage the outward appearance of container and make the undercapacity of container.
The flat 7-315358 of TOHKEMY discloses a kind of method, and wherein corrugated paper is pressed under heating in metal die.In the method, corrugated sheet as base material, is absorbed the distortion that causes because of compacting by its notching construction so to a certain extent.
Yet, when using common substrate such as cardboard, can not use this with the method for corrugated sheet as substrate.In addition, can not remove the pleat trace that causes by compacting fully.
The flat 6-239334 of TOHKEMY discloses a kind of method, wherein paper pulp fiber is flooded with olefin resin, and so the sheet material that has extendability by this mixture acquisition is suppressed sheet material then.The flat 10-8393 of TOHKEMY discloses a kind of method, wherein has the mixture acquisition of the sheet material of improved extendability by thermoplastic resin fibre and paper pulp fiber, then with sheet material compacting under heating.
Yet, but these methods are by making the substrate that mainly comprises paper have press processability to wherein adding thermoplastic resin.Give the substrate press processability but these lists of references are unexposed by the physical property of control body paper with by the mode of structure certain layer structure.In addition, use a large amount of thermoplastic resins can cause recuperability to reduce and increase the serious problems of environmental pressure when abandoning.
There is following defective in the substrate that obtains by said method: when when its mechanograph that compacting obtains under pressurization is had the sweep of gross distortion, the inhomogeneities of wrinkle is serious and can not remove by compacting at sweep.Therefore mouldability is poor.
When the noodles that this container are used for food containing water, beverage, soup and band soup, and during other various uses, use the sidewall molded plastic container higher than the sidewall of tray-like container and cup-like containers.
Summary of the invention
An object of the present invention is to provide a kind of body paper of suitable compression moulding.This body paper mainly comprises slurry, and it has such mouldability, and promptly this base material is not easy to break and can not form inhomogeneities on the fine wrinkle part of office, folding part in the compression moulding step, and has high production rate.
Another object of the present invention provides the paper container, and this paper container can be by extension production (deep drawn container), and can be used as quite dark pallet and cup, as has the degree of depth of 40mm or darker, also is provided for producing their method.
Another object of the present invention provides the paper container of producing by the deep drawn method, this container weight light and in its housing and bottom swelling not, also have high rigidity simultaneously.
For achieving the above object, the invention provides a kind of molding base paper that satisfies following condition (1) to (4):
(1) TENSILE STRENGTH (JIS-P 8113) 2.0kN/m at least,
(2) extension at break (JIS-P 8113) at least 1.5%,
(3) critical compressive stress (by following formula definition) is 1 to 10MPa:
Critical compressive stress=A/B
Wherein A represents the compressive strength by JIS-P 8126 definition, B be illustrated in the load part of measuring the test pieces in the compression moulding intensity area and
(4) by in thickness direction, applying 20kgf/cm
2The compressive deformation amount that compression stress causes is at least 10%.
The present invention also provides has density 0.7 to 0.9g/cm
3High-density layer and have density and be lower than 0.7g/cm
3Low-density layer, and have total basic weight 100 to 500g/cm
2With gross density 0.4 to 0.7g/cm
3Molding base paper.Wherein low-density layer mainly is made up of at least a paper pulp that is selected from mechanical pulp, crimped fibre and the mercerization paper pulp.
Description of drawings
Fig. 1 is for describing the flow chart that how to pass through the blank sheet material 3 of a pair of mould 1,2 molded paper.Figure 1A provides blank sheet material is positioned over state on the former before compacting.Figure 1B provides the state of Paper moulded product on the concave part that is positioned over former after the compacting.
Fig. 2 is the perspective view of paper pallet, and it describes the shape of an example of paper container.
Fig. 3 is the perspective view of paper pallet, and it describes the shape of another different examples of paper container.
Fig. 4 is a cross-sectional view of taking from the paper pallet of b-b line among a-a line among Fig. 2 or Fig. 3, wherein provides the circular cone joint angle (φ) and the radius of curvature of curve.
Fig. 5 is the perspective view with pallet of round bottom.
Fig. 6 is the cross-sectional view of paper pallet, wherein provides the projection floor space (S3) of pallet.
Fig. 7 is the cross-sectional view with paper pallet of round bottom, wherein provides the actual floor space (S4) of pallet.
Fig. 8 is the plane of blank sheet material, wherein forms line of weakness in both sides.
Fig. 9 provides the perspective view of the mold container that uses the blank sheet material of describing among Fig. 8.
Figure 10 describes the perspective view of the rectangular mould container that obtains of taking from different angles in embodiment 3-1.
Figure 11 is described in the perspective view of the square mold container that obtains among the embodiment 3-2.
Figure 12 is described in the perspective view of the circular mold container that obtains among the embodiment 3-3.
Figure 13 is described in the perspective view of the circular mold container that obtains among the embodiment 4.
The specific embodiment
The natural pulp fiber that is used to form molding base paper of the present invention is, for example xylon (chemical pulp and mechanical pulp), non-wood fiber and waste paper pulp.They can be chosen on demand suitably.
Xylon comprises the fiber from coniferous tree and broad leaf tree.In these xylons, chemical pulp comprises by the kraft pulp that uses NaOH and vulcanized sodium to produce in boiling wood chip step, and the sulfite pulp by using sulfurous acid and bisulfites to produce.These paper pulp can be not bleaching or bleaching.
These kraft pulps comprise needle kraft pulp and broad-leaved kraft pulp.Whether according to paper pulp is bleaching or unbleached, these paper pulp can be categorized as bleached kraft pulp such as needle bleached kraft pulp (NBKP) and broad-leaved bleached kraft pulp (LBKP), and bleached kraft pulp such as needle bleached kraft pulp (NUKP) and broad-leaved bleached kraft pulp (LUKP) not not.
Mechanical pulp comprises the ground wood pulp (GP) that obtains by with wood grinder grinding round log, and passes through the correct grinding ground wood pulp (RGP) of correct grinding from the waste wood acquisition of sawmill, and passes through heating and finish grind the hot groundwood pulp (TMP) that wood chip obtains.
In those mechanical pulps, consider the bulkiness (bulkiness) and the intensity of resulting sheet, preferred TMP.TMP also comprises by depress C-TMP that correct grinding obtains and the BC-TMP that handles acquisition by other bleaching adding behind the chemical treatment wood chip.
By the stock quality of molding base paper, the consumption of TMP is generally 10 to 100%, and more preferably 20 to 80%.
In those xylon paper pulp, by the extensibility and the intensity that long stapled those xylon paper pulp are suitable for improving body paper that has of coniferous tree such as pine tree, larch, cdear, fir and Japanese cypress acquisition.
Also the staple fibre paper pulp that is obtained by broad leaf tree such as birch, beech, maple, elm and chestnut can be mixed use with the long fiber tree, otherwise damaging effect of the present invention gets final product.
Can be used for non-wood fiber of the present invention and comprise bast fiber, as paper grade (stock) mulberry tree, paper grade (stock) dwarf thicket, ganpi, flax, hemp, mestha, ramie, jute and janapan; Seed fiber such as cotton and cotton linters; Leaf fiber such as abaca, sisal hemp and Spanish grass (Esparto); And fasciated fiber such as bamboo, straw, straw and bagasse.
Paper grade (stock) mulberry tree, paper grade (stock) dwarf thicket, mestha, abaca, sisal hemp, cotton and cotton linters are particularly preferred, because they have long fiber and can improve the extensibility and the intensity of body paper of the present invention.
Non-wood fiber can be by the mode boiling identical with xylon.
Can be used for secondary stock of the present invention and comprise, for example useless corrugated paper and useless magazine paper.Useless corrugated paper is particularly preferred, because they can improve the extensibility and the intensity of the scraps of paper.
These paper pulp fibers can use separately or use with its two or more mixture.
If necessary, can be with synthetic resin fiber and these mixed with fibers, however damaging effect of the present invention gets final product.Here available synthetic resin fiber is, for example polyethylene fiber, polypropylene fibre, polyamide fiber, pet fiber and polybutylene terephthalate (PBT) fiber.Yet, consider the recovery of molding base paper and reduce environmental pressure that the amount of the synthetic resin fiber that will use should be as far as possible little.For example, if use, its suitable amounts is by the total fiber in the molding base paper, is at the most 10%.
Molding base paper by above-mentioned paper pulp fiber preparation preferably has TENSILE STRENGTH (JIS-P 8113) 2.0kN/m at least.This molding base paper preferably has extension at break (JIS-P 8113) at least 1.5%, and more preferably at least 2.0%.When this molding base paper had TENSILE STRENGTH and is lower than 2.0kN/m or extension at break and is lower than 1.5%, low and this body paper of the tensility of body paper can break when compression moulding.
The performance of body paper can be controlled in these scopes by known method, the example of described method is: wherein preparation has in the body paper of multilayer and these layers the method that one deck at least is made of NBKP, or to the method that wherein adds enhancement additive.
When pressing mold has sweep when bigger curvature (or) of high deformation, must in the compression moulding step, absorb deformation by form folding fine wrinkle at sweep.In the case, the fine wrinkle part folds at in-plane and rolls the formation uneven surface, then this uneven surface is compressed by being compressed on thickness direction.Therefore, be obtaining higher mouldability, preferably critical compressive stress (measuring by following formula) is controlled at 1 to 10MPa, in preferred 3 to the 9MPa scopes, is 10% or higher in the compression ratio of thickness direction, preferred 15% or higher.In the case, term " compression ratio " is meant when applying 20kgf/cm
2Compression ratio during compression stress on thickness direction.
Critical compressive stress=A/B
Wherein A represents the compression stress by JIS-P 8126 mensuration, and B is illustrated in the area of the load part of measuring the test piece in the compressive strength.
When critical compressive stress during greater than 10MPa, wrinkling part is not easy to roll.When compression ratio was lower than 10%, it is not enough that the compression moulding of wrinkling part becomes.Therefore, in these cases, can not obtain good mouldability.
For the compression ratio with critical compressive stress and thickness direction is controlled in the above-mentioned scope, it is low that the density of molding base paper should keep.For this reason, preferred hard paper pulp fibres.Usually, with the paper pulp fiber making beating, obtain the scraps of paper (that is, usually mechanical external force being imposed on the paper pulp) thus so that the honeycomb wall fibrillation of fiber with uniform shapes.Yet, in the present invention, should control the making beating operation gentlier, to keep the hardness of fiber.For example, preferred control making beating degree, make the freedom (Tappi T-227 Canadian standard) of chemical pulp should be 500mlcsf at least, the freedom of mechanical pulp should be 180mlcsf at least, the freedom of hemp paper-pulp and mestha should be 500mlcsf at least, and the freedom of useless ripple paper pulp should be 500mlcsf at least.For with the paper pulp fiber making beating, use beater, jordan mill, cydariform refiner, collar plate shape refiner etc.
Blowing agent can be added in the molding base paper to reduce its density, only otherwise damaging effect of the present invention gets final product.
Can will contain the thermal expansion microcapsules of low boiling point solvent as blowing agent.These microcapsules are the particle form of average diameter 10 to 30 μ m, and these microcapsules are by heating extremely about 4 to 5 times of diameter expansion, volumetric expansion to about 50 to 100 times 80-200 ℃ following short time of low temperature.Each microcapsules includes the volatile organic solvent (swelling agent) that covers with thermoplastic resin (copolymer that comprises vinylidene chloride, acrylonitrile, acrylate etc.) as iso-butane, pentane, benzinum, hexane, low boiling halogenated hydrocarbons or methyl-monosilane.When these capsules being heated to temperature when being higher than the polymer softening point, this polymer film begins to soften, and the vapour pressure of wherein contained swelling agent raises film is expanded, and causes capsule to expand thus.Blowing agent added in the pulp and in heating of producing molding base paper and drying steps, foam, maybe when the molding base paper that contains blowing agent by this blowing agent foaming when having the water of high temperature.In addition, lightweight pigment such as shirasu balloon can be added in the pulp to reduce the density of body paper in the step of preparation body paper.
The chemical reagent that can be used for production body paper of the present invention is sizing agent, enhancement additive and tightness improver (yield improver) etc., and they are identical with those chemical reagent that are generally used for papermaking.If necessary, can use them.
Here, sizing agent such as alkyl ketene dimer, styrene/acrylic resin and rosin in spendable sizing agent comprises.Strength additive and tightness improver comprise: organic compound, as polyacrylamide resin, polyamide epichlorohydrin resin, polyethylene imine resin and its derivative, poly(ethylene oxide), polyamine, polyamide, polyamide polyamine and its derivative, CATION and amphoteric starch, oxidized starch, carboxymethylated starch, plant gum and polyvinyl alcohol; Inorganic compound such as aluminum sulfate, alumina sol, colloidal silica and bentonite.They can be suitable mixed form use.
These additives can be by spraying between ply of paper in the papermaking step or adding by in paper-making process or after the papermaking it being applied to the lip-deep mode of body paper.
In the process of papermaking of the present invention, can use filler.These fillers comprise inorganic filler such as talcum, kaolin, calcined kaolin, clay, diatomite, powdered whiting, magnesium carbonate, aluminium hydroxide, titanium dioxide, magnesium sulfate, silica, alumino-silicate and high mountain range scholar; And organic synthesis filler such as granules of polystyrene and urea/formaldehyde resin particle.They can be suitable mixed form use.
In addition, can suitably use paper making additive such as dyestuff, pH regulator agent, slime-control agent, defoamer and thickener according to purposes.
In papermaking process of the present invention, pH can choose to about 6-8 (neutral paper process) scope in about 4.5 (acid papermaking methods) as required.
Molding base paper of the present invention by conventional method by the pulp preparation that comprises above-mentioned initial substance and chemical reagent.Paper machine is not had special restriction, can use the paper machine of conventional paper machine such as fourdrinier machine, cylinder mould machine, tanmo paper machine, oblique net paper machine or appropriate combination type.
These scraps of paper can or pass through the drier drying with common multi-cylinder drier drying, Yankee drier.This drier there is not particular restriction.
Molding base paper of the present invention can be constituted or be can be the multi-ply paper that comprises two-layer above sandwich construction by individual layer.This multi-ply paper can be easy to obtain by multiple paper process.
So the body paper that obtains has basic weight preferred 100 to 500g/m
2, more preferably 200 to 400g/m
2When basic weight is lower than 100g/m
2The time, the layered product that obtains after the compression moulding can not have enough intensity.On the contrary, be higher than 500g/m when basic weight
2, the mouldability of wrinkling part can reduce irrelevantly.
The density of this molding base paper is preferably 0.4 suitably to 0.7g/m
2, more preferably 0.50 to 0.65g/m
2
As mentioned above, the paper that satisfies condition of the present invention (1) to (4) can pass through method for preparing.For making the abundant balance of intensity, elongation, hardness and compressibility, molding base paper is suitable to using high-density layer and low-density layer in conjunction with preparation.
Molding base paper of the present invention is preferably multi-ply paper, wherein low-density layer is used as the intermediate layer and with high-density layer and clamps the skin in this intermediate layer.Construct body paper in this way, the gained body paper becomes loose and has high rigidity, and low-density layer and high-density layer can be made of two-layer or multilayer respectively.
The proper density of high-density layer that is used for the molding base paper of multi-ply paper form is 0.7 to 0.9g/cm
2, preferred 0.75 to 0.85g/cm
2High-density layer preferably mainly is made of kraft pulp or high-quality waste paper.By constructing body paper in this way, the intensity of gained body paper, elongation, hardness and compressibility are by abundant balance.
The proper density of low-density layer that is used for the molding base paper of multi-ply paper form is lower than 0.7g/cm
2, preferably be lower than 0.2 to 0.6g/cm
2
The hardness of paper, cardboard or its analog is expressed as follows (the supposition sheet material is a cantilever):
S＝E·I/B·W＝E·T
3/12·W
Wherein E represents Young's modulus (MPa), and I represents how much moment (N.cm of inertia
2), B represents the width (mm) of sample, and W represents the weight (kg) of sample, and T represents sample thickness (mm).
That is to say, can think the cube proportional of hardness S and Young's modulus and sheet thickness.
For the hardness of sheet material with sandwich construction such as cardboard, as A.T.Luey at Tappi Nov.1963, Vol.46, report among the No.11: the hardness number in each layer is measured by the Young's modulus of each layer and how much moments of inertia.Then, calculate the hardness number summation of each layer to determine the hardness of total sheet material.Consider that based on this hardness is with uprising from the distance of paper mid-depth elongated (or in other words paper thickening).Therefore, the intermediate layer is desirably loose.Because hardness is by (thickness) 3 * (Young's modulus) expression, therefore outer field Young's modulus is high more, and is effective more to the improvement of hardness.
Therefore, the proper density in intermediate layer is 0.2 to 0.6g/cm
3, preferred 0.3 to 0.5g/cm
3Density when the intermediate layer is lower than 0.2g/cm
3The time, interlaminar strength seriously reduces.Otherwise, when this density surpasses 0.6g/cm
3The time, the density of total body paper can not be controlled in 0.4 to 0.7g/cm
3
In the present invention, outer field density should be 0.7 to 0.9g/cm
3When outer field density is lower than 0.7g/cm
3The time, outer field Young's modulus is low and can not expect hardness of the present invention is improved to some extent.On the contrary, surpass 0.9g/cm when density
3The time, the tension that the outer field surface of body paper becomes.Therefore, in the step of preparation paper, be difficult to obtain to have the layer of higher density basically, in addition, but can not obtain suitable compactibility.
Although the various paper pulp that are used to form high-density layer are not had particular restriction, by being specially suitable to coniferous tree paper pulp such as NUKP and the NBKP slurry that obtains of highly pulling an oar for keeping its hardness.Be to obtain effect of the present invention, outer (high-density layer) basic weight is 15 to 100g/m suitably
2When this basic weight is lower than 15g/m
2The time, the layer and the Hard copy body that are difficult to obtain to have high Young's modulus are difficult to make.On the contrary, surpass 100g/m when outer basic weight
2The time, the basic weight of low-density layer reduces relatively, the result, and the density of total body paper raises, and makes to be difficult to this density is controlled at 0.4 to 0.7g/cm
3In the scope.
In the present invention, common cardboard is similar with producing, and the multilayer body paper is produced with the multilayer combination model.For example, will be equivalent to tens of g/m
2The paper pulp continuous laminating of butt weight form wet-sheet to the papermaking wire-cloth of about 10 positions.
Particularly, at first be used to form the about 40g/m of formation on the papermaking wire-cloth part of ply of paper
2Pulp layer is as skin.Then with its dehydration and be transferred on the felt.Then, repeat mode same as described above and in another papermaking wire-cloth part, form ply of paper as the intermediate layer.So the intermediate layer with aequum places on the skin.At last, form other ply of paper, obtain molding base paper of the present invention thus.
The present invention is used to form the paper pulp of low-density layer for to have freedom (according to Canadian standard JIS-P 8121) 200 to 650ml under the disassociation state again, preferred 250 to 550ml paper pulp.When freedom was lower than 200ml, this paper pulp fiber can not effectively dewater, so extruded sheet has compact texture.This fact causes production low-density ply of paper configurations difficult.On the contrary, when freedom surpassed 650ml, the density of sheet material was low excessively, therefore caused layering in compression step, caused the balloon-like swelling in paper technology.
The paper pulp that has freedom 200 to 650ml under disassociation state again can be adjusted to Canadian standard 250 to 700ml, no matter use which kind of paper pulp as initial substance.The freedom of the paper pulp of measuring by the body paper that dissociates again for determine by have at short notice good operating characteristics the necessary pulp property that obtains of product be effective.More preferably, by total paper pulp, contain 50% or higher mechanical pulp, mercerization paper pulp and crimped fibre in any.
The paper pulp material that is used to form low-density layer is mainly and can makes the low-density ply of paper paper pulp material of foaming easily.Particularly, these paper pulp are mechanical pulp.Mechanical pulp by with timber (particularly pine) Mechanical Crushing, makes its disassociation obtain usually then.Can use GP, TMP, RGP etc.Wherein, TMP and RGP are preferred.Especially, the paper pulp by acquisitions such as pine, southern pine tree, Douglas firs is preferred for obtaining the low-density ply of paper.In addition, when using them, density only slightly reduces in the compression moulding step.Also can use non-wooden material such as mestha, reed, bamboo and bagasse (having removed the crushing sugarcane of sucrose).Paper pulp by the part chemical treatment obtains also can be included in the mechanical pulp as the paper pulp that obtains by machinery crushing in the presence of chemistry and bleached pulp.
In addition, have the paper pulp material such as mercerized pulp and the crimped fibre that are used to prepare low-density layer that reduce density by chemical treatment, also can preferably use.
In the present invention, above-mentioned paper pulp is mainly used in the formation low-density layer.They can reach with the paper pulp by the common wood preparation by the suitable mixture form of the chemical pulp of various non-wooden materials such as mestha, reed, bamboo and bagasse preparation and use.
Effectively, the outermost layer that forms paper sheets at least one surface of all above-mentioned molding base papers (hereinafter referred to as " be full of cracks prevents layer "), to prevent in the deep drawn process, on the gained vessel surface, forming be full of cracks with extension at break (at least one direction of MD and CD direction) at least 5% (JIS-P 8113).
The mechanograph of producing by deep stretching process in molding step is than the mechanograph of producing by shallow drawing process, easier stretching, extension.Especially, the ply of paper that forms the mechanograph outside is compared with forming inboard ply of paper, and its extension degree is higher.Therefore, the outside should have higher extension at break.Outer field extension at break preferably at least 6%, more preferably 7% or higher.
Can be used for forming outermost paper pulp and be aforesaid those.In the xylon slurry, by the extensibility and the intensity that long stapled those paper pulp are fit to improve paper sheets that has of coniferous tree such as pine tree, larch, cdear, fir and Japanese cypress acquisition.
In non-wood, paper grade (stock) mulberry tree, paper grade (stock) dwarf thicket, mestha, abaca, sisal hemp, cotton and cotton linters are preferred, because they have long fiber, and they can improve the extensibility and the intensity of paper sheets.
The chemical reagent that can be used for papermaking is the conventional chemical reagent that is used to prepare molding base paper of the present invention.They can be selected from sizing agent, enhancement additive, tightness improver, mineral filler, organic sclerosis filler, dyestuff, pH regulator agent, slime-control agent, defoamer and thickener suitably.
Be used for chapping and prevent that the paper sheets that the high fracture of having of layer stretches from can be prepared as follows by the slurry that contains above-mentioned initial substance and chemical reagent: will be used to compress rotation is arranged at the l Water Paper paper machine by the boundless thick rubber strip device of nip rolls dryer roll parts.L Water Paper is passed through between drier and belt.By the belt that shrinks aforementioned stretching, extension paper is shunk.The method is called the Clupak method.In other method, the scraps of paper are peeled off from pressure roller, cylinder drier or the Yankee drier of paper machine or processing machine with scraper, form wrinkle thus.This method is called " crepe paper method ".This crepe paper method can be carried out with various devices such as doctor blade device by variety of way, depends on the position of wrinkle.For example, in two stress methods, wrinkle is set, it is extended the roller of this paper by the band groove of drier intermediate member in length and width then with the blade in the compression section of paper machine.
Among the present invention, the scraps of paper that prevent layer that are used to chap that obtain in said method not only can be single sheet, and can be the compoboards with two-layer or multilayer.
The basic weight of the scraps of paper that being used to form chaps prevents layer is preferably 40 to 300g/m
2, more preferably 50 to 150g/m
2When the basic weight of these scraps of paper is lower than 40/m
2The time, the TENSILE STRENGTH of the scraps of paper is not enough and these scraps of paper break in molding step easily, on the contrary, and when surpassing 300g/m
2The time, by preventing that as be full of cracks the density of the molding base paper that the scraps of paper lamination of layer obtains from raising, and so can reduce the mouldability of the wrinkling part of moulding article irrelevantly with this.
Chap the scraps of paper that prevent layer by being used to form of this method acquisition can be by adhesive and molding base paper lamination.Laminating method there is not particular restriction.This lamination can carry out by the following method: wet laminating, wherein aqueous binders such as synthetic resin, starch or PVA are applied on the body paper, and then be full of cracks is prevented that layer is pressed onto on the body paper by nip rolls; The hot melt laminating wherein will be applied to by the hot-melt adhesive of heat fused on the body paper, then be full of cracks be prevented that layer is pressed onto on the body paper by nip rolls; Or the extruding layer platen press, thermoplastic resin that wherein will be by heat fused such as polyethylene or polypropylene are applied on the body paper with form of film, then be full of cracks are prevented that layer is pressed onto on the body paper by nip rolls.
If necessary, can on the one or both sides of molding base paper of the present invention, form and comprise the pigment coated of pigment and adhesive.By forming coating, can make the surface of molding base paper have high impressionability.
In addition, can form printed layers by common printing machine by using printing ink such as dye ink or pigment ink.
The pigment that is used to form coating can be selected from known pigment such as calcium carbonate, kaolin, clay, talcum, titanium dioxide and plastic pigment suitably.
The adhesive that is used to form coating can be selected oneself suitably and be known adhesive such as starch, casein and SBR latex and polyvinyl alcohol.
Coating can be single or multiple lift, and the coating total amount is suitably about 20 to 30g/m
2
In the time will forming this coating, the layer that is right after below coating preferably has high freedom and smooth surface.
This coating can form with the apparatus for coating that is selected from various known devices suitably.Also can on coating, further form printed layers.
If necessary, can on one or two surface of molding base paper of the present invention, form waterproof membrane, to prevent that this paper is by liquid infiltration or seepage.Waterproofing membrane can directly form on body paper, or forms on coating or printed layers as required.
This waterproofing membrane can form by the coating water-repellent paint or by lamination synthetic resin.The method that is used to form waterproofing membrane can be chosen suitably according to condition.
Impose on the coating of its waterproof is comprised: emulsion such as micro-crystallization paraffin and paraffinic waxes; Latex such as SBR latex and polyvinylidene chloride latex; But the polyolefin emulsion of synthetic resin emulsion such as emulsion acrylic resin self-emulsifying and polyethylene and ethylene copolymers resin emulsion.The device that is used to be coated with water-repellent paint is not had particular restriction, can from conventional drawdown rod, air knife doctor knife coater, roll coater, scraper-type doctor knife coater, basket formula roller and starching press (size press), choose suitably.Coating is preferably 1.0 to 20.0g/m in dried coating total amount
2Coating can be single or multiple lift.
Being formed at the lip-deep synthetic resin layer of body paper can be made of following resin: vistanex such as polyethylene, polypropylene and polymethylpentene; Saturated polyester resin such as polyethylene terephthalate and polybutylene terephthalate (PBT); Polyamide such as nylon; The ethylene/vinyl alcohol copolymer; Polystyrene resin; And polyacrylonitrile resin.Can with this body paper with a kind of in these synthetic resin or its two or more mix lamination or coating, form waterproofing membrane thus.Method to the lamination synthetic resin layer does not have particular restriction, usually can be from wet lamination, hot melt lamination, extrude lamination, dried lamination and the lamination methods and choose suitably.
When stretching by compression under very high pressure, the line of weakness part that will form folding wrinkle as the molding base paper upper edge of vessel surface can produce colour inhomogeneous.This colour inhomogeneous outward appearance of seriously damaging product reduces its commercial value thus.
Pigment is added in the synthetic resin layer effectively head it off.
The amount of pigment in synthetic resin layer is preferably 3 to 40wt%.When it is lower than 30wt%, can not obtain fully to shelter colour inhomogeneous effect.On the contrary, when this consumption during greater than 40wt%, the physics of synthetic resin and chemical property reduce, and make the stable synthetic resin layer difficulty of formation on body paper.
Particularly, the molten film width of cloth (neck-in) that contracts appears on the T-die head, but and because the coating of synthetic resin layer is not enough part lacks synthetic resin layer.
When the synthetic resin that uses as vistanex and pigment during as titanium dioxide, the amount of titanium dioxide is preferably 5 to 10wt%, basic weight is preferably 15 to 60g/m
2
Above-mentioned water-repellent paint or synthetic resin can be biodegradable thermoplastic resin.
Biodegradable thermoplastic resin there is not particular restriction, as long as they have the biodegradable identical or higher with paper.They comprise aliphatic polyester such as 3-butyric ester/3-hydroxyl pentanoate copolymer, 3-hydroxybutyric acid ester polymer and polycaprolactone; Poly-glycolide such as PLA; Polyvinyl alcohol; Polyvinyl alcohol/composites of starch; With cellulose derivative such as cellulose ethanoate.Synthetic and/or natural resin can use separately or with its form of mixtures.
In those biodegradable thermoplastic resins, particularly preferred those are aliphatic polyesters among the present invention.Its highly processable when biodegradable aliphatic polyester and body paper lamination, and obtain having excellent water-resistance of product.
Biodegradable or not biodegradable resin and additive can be added in these thermoplastic resins, to improve its biodegradable and physical property.When adding not biodegradable resin and additive, its addition is not more than the amount of thermoplastic resin suitably.When the former during greater than the latter, the biodegradable of pallet or container itself is presented adverse effect.
Below, the compression moulding of molding base paper is described.
＜molding methods 〉
The moisture of control body paper
Molding base paper of the present invention can be by so-called extension production, and wherein mold pressing goes out to be used for the blank sheet material of container from body paper, carves this sheet material in necessity part with line, and each blank sheet material is placed between the formpiston and former of press under heating.In the method, should control the moisture of molding base paper in advance.
The moisture of body paper should be 10 to 20%, and is preferred 11 to 17%, and most preferably 12 to 15%.Here term " moisture of body paper " is meant the wt% of water, presses the baking dry weight basis of total paper pulp in the molding base paper.
When the moisture of body paper remains in this preferable range, with body paper plasticising to improve its mouldability and during molding, to reduce breaking of ply of paper.As a result, obtain container by stretching and have the higher degree of depth, smoothness and good outward appearance, and high rigidity.
When the moisture of body paper is lower than 10%, can not obtain to have the mouldability of enough hardness.On the other hand, when moisture surpassed 20%, this molding base paper bubbled and original paper layer is peeled off, and in addition, because the moisture height, so dry the needs for a long time, productivity ratio is lowered unfriendly as a result.
The moisture of body paper can be controlled by the following method: before compression moulding water is imposed on the body paper immediately, or in paper-making process paper is taken out the wetting and method that this paper is carried and stored in back from drier under its moisture condition of maintenance.
Molding methods
Step based on the blank sheet production mold container that is made of molding base paper sheet material of the present invention will be described below.
According to the present invention, stretch with a pair of press die.As shown in Figure 1, a pair of press die is a formpiston (convex mold) 1, and it is equivalent to the shape of the inner surface that will obtain for concave surface form and having, and female mold (negative mold) 2, and it is for convex form and have the shape that is equivalent to mold outer surface.In Fig. 1, convex mold 1 moves towards negative mold downwards, compresses blank sheet material thus.In the case, the direction of mould motion (comprising the mould relative motion) is not had particular restriction, and be conspicuous those skilled in the art.For ease of explanation, convex mold is called mold, negative mold is called bed die, and moves the situation of compressing blank sheet material thus with reference to mold wherein to bed die and be described.
Heating-up temperature in the molding step should make the temperature of heating molding base paper be preferably 100 to 150 ℃, more preferably 110 to 140 ℃.When the temperature of heating molding base paper when being lower than 100 ℃, molding needs long-time, reduce productivity ratio thus, on the contrary, when this temperature is higher than 150 ℃, this body paper bubble especially easily (when it has high-moisture).
Can by in the press that molding base paper is positioned over heating to control it under above-mentioned predetermined temperature.
In other method, moisture molding base paper with electromagnetic wave such as heating using microwave, is put into press then.
To from mould, take out by the container of blank sheet molding.Although the container that takes out can carry out air drying, preferably elevated temperature vessel is remained in the scheduled time in the cooling die so that its cooling from mould.
This hot pressing die is made of well known materials such as aluminium, aluminium alloy, brass, iron, stainless steel or pottery.
This mould can be by any hydraulic press, cylinder and cam mechanically actuated.Gap between mold and the bed die can be by hydraulic pressure or air pressure method control.This pressure can be by the THICKNESS CONTROL of computer according to mechanograph, or by regulating the stopper Position Control.In cam machinery, this intermittently can be controlled according to the cam face of design in advance and the decrease speed of mould.
In compression moulding, pressure is preferably 10 to 100kgf/cm
2When this pressure is lower than 10kgf/cm
2The time, the compressive deformation deficiency in the second portion, on the other hand, when this pressure surpasses 100kgf/cm
2The time, this ply of paper breaks irrelevantly at folded part.
Consider mouldability and machinability, be preferably 2 to 30 seconds the pressing time in the compression moulding step.
The shape of＜container 〉
Container of the present invention is opening on top usually, and has flange or chimb (Fig. 2,3 and 5) above that.This flange can be curled.
The plan view of container can be square, rectangle, circle, ellipse or similar pattern.When it was rectangle, it is circular that the corner is generally.
Fig. 2 and Fig. 3 have provided the example by the container of the present invention of extension preparation.Fig. 2 has provided elliptical vessel.Fig. 3 has provided rectangular vessel.
This container has the bottom and the upwardly extending sidewall from the bottom.The bottom is generally the plane.In Fig. 2 and 3, from flat upright sidewall and the bottom out of plumb of making progress, but outward-dipping, or in other words it is tapered.When this sidewall and bottom vertical, container can not be piled up singly.
Fig. 4 is the viewgraph of cross-section along the container of b-b line among a-a line or Fig. 3 among Fig. 2.In the case, Fig. 2 is identical with the viewgraph of cross-section of the container shown in Fig. 3.
Among Fig. 4, bottom cone angle (φ) is served as reasons and the definite angle of the sidewall in the container.Preferred 95 to 130 ° of cone angle.Radius of curvature at the container edge of being determined by bottom and sidewall is provided by (r) among Fig. 4.
In paper container of the present invention, the corner between bottom and the sidewall is folding but curling.When radius of curvature hour, this paper particularly breaks at four angle edges easily at edge, in addition, is increased in the wrinkle of the edge between the sidewall easily.
When radius of curvature is big, can not obtain dark container by stretching, and the service efficiency of material is low.When flat area is, for example during 10cm * 10cm, radius of curvature is preferably about 0.5 to 2cm.Radius of curvature should accurately be measured according to bottom area.When the value that radius of curvature (r) is obtained divided by the square root of floor space (S1) is preferably approximately 0.05 to 0.2cm the time, can obtain the not damaged dark container of paper by stretching.
In the present invention, except said vesse, can obtain non-flat container with approximate flat and approximate flat sidewall.For example, as shown in Figure 5, but production hemispherical container.The part of the container bottom that available another pressurization machinery will be as shown in Figure 5 behind the molding is turned in the container, can place this container is stable like this.
＜bottom area 〉
When being positioned over container on the plane surface, the area of bottom (S1) is the area of the part that contacts with this plane surface of container.When bottom area is not easy to measure, can use projection floor space S3 or actual floor space S4 ((A) and (B) explanation by the following method).
(A) when sidewall is almost the plane, the projection floor space is for by the area of the part that centers on the rectangular sidewall crestal line in limit and the line that draws from intersecting of the line of bottom planar surface extension.This projection bottom area S3 provides in Fig. 6.Fig. 6 is the viewgraph of cross-section that is similar to Fig. 4.
(B) the inside cube volume of mensuration container.Measure the aperture area S2 at container top place.Actual floor space S4 measures according to formula: V=(S4+S2) * H/2.
In the case, S2 is that as shown in Figure 7, it is and the similar viewgraph of cross-section of Fig. 4 by the area of the periphery of vessel port side encirclement.
＜container height 〉
The paper container that obtains by stretching among the present invention is quite dark.The degree of depth (height of container) is according to the area decision of container bottom.
In other words, the paper container that obtains by stretching among the present invention is characterised in that and satisfies following formula:
0.2≤H(S1)
1/2 (1)
Wherein S1 represents the floor space of container, and H represents its height.
S1 is for as described above.If necessary, above-mentioned S3 or S4 value can be used as bottom area S1.
By height H being preferably 0.3 to 1.2 divided by the numerical value that the square root of floor space obtains according to formula (1).Particularly, when this numerical value be 0.4 or when higher, container can be the cup form.
When this numerical value is lower than 0.2, mean to obtain enough stretchings.The container that obtains is not suitable for splendid attire to have the material of high-moisture or is used for liquid.In addition, in the case, this sidewall is for the effect deficiency of the hardness that improves container.
When this numerical value greater than 1.2 the time, to such an extent as to the container that obtains by deep drawn can not keep body paper not break in molding step too deeply.
When this container does not have in fact when flat, formula (2) preferably should satisfy the relation between height H and the aperture area S2:
0.15≤H(S2)
1/2 (2)
Identical among the shape of container and Fig. 5.Identical among S2 in Fig. 5 and Fig. 7.
The wall of＜mold container 〉
The container that has above-mentioned shape and actual required hardness for acquisition prevents that simultaneously its bending area from breaking, and must will have low-density and the high-intensity molding base paper material as chamber wall formed by stretching.For obtaining this body paper, it is preferred containing the mechanical pulp that residues in lignin wherein in a large number.The amount of mechanical pulp in whole paper can be measured by measuring the Kappa number according to JIS P-8211.
That is to say that the Kappa number that is used to form whole paper pulp of container of the present invention is preferably 40 to 160.
Molding base paper of the present invention contains natural pulp as major constituent, and its mouldability is better than conventional molding base paper.
The following examples further specify the present invention, and these embodiment do not limit the present invention in any way scope.Except as otherwise noted, umber is pressed solid weight meter.
＜embodiment 1-1 〉
Use disk refiner, commercial NBKP is pulled an oar to 550mlcsf (Tappi T-227, Canadian standard), loose TMP pulls an oar to 300mlcsf with heavily fortified point, and commercial NUKP is pulled an oar to 550mlcsf.
By these raw materials, prepare by three layers in conjunction with paper machine with multilayer, i.e. ground floor 40g/m
2NBKP, second layer 250g/m
2TMP and the 3rd layer of 40g/m
2The cardboard that NUKP forms.This cardboard is used as molding base paper.
Compressive deformation on the TENSILE STRENGTH of this cardboard, extension at break, critical compressive stress and the thickness direction is measured by the following method.
The body paper that so obtains is used to form pallet, and assesses its mouldability.
＜embodiment 1-2 〉
Consisting of of raw material: pull an oar to the commercial LBKP of 500mlcsf with disk refiner for 80 parts, pull an oar to commercial NBKP and 10 parts of blowing microcapsule (trade names: Matsumoto Microsphere F-30D of 500mlcsf for 20 parts, be Matsumoto Yushi Seiyaku Co., the product of Ltd.).
Has basic weight 150g/m by this raw material with the experiment machine preparation of making hand-made paper
2The scraps of paper, be dried to 110 ℃ with rotary drier then.This hand-made paper is assessed as molding base paper and by the mode identical with embodiment 1-1.
＜embodiment 1-3 〉
Commercial NBKP is pulled an oar to 600mlcsf with disk refiner.Has basic weight 260g/m by this raw material with the experiment machine preparation of making hand-made paper
2The scraps of paper, be dried to 110 ℃ with rotary drier then.This hand-made paper is assessed as molding base paper and by the mode identical with embodiment 1-1.
＜embodiment 1-4 〉
TMP pulls an oar to 300mlcsf with disk refiner with pine.Has basic weight 280g/m by this raw material with the experiment machine preparation of making hand-made paper
2The scraps of paper, be dried to 110 ℃ with rotary drier then.This hand-made paper is assessed as molding base paper and by the mode identical with embodiment 1-1.
＜comparative example 1-1 〉
With the hard loose TMP disassociation of 50 weight portion crimped fibres (product of Weyerhaeuser Co.) and 50 weight portions and under not pulling an oar, be mixed together, obtain raw material thus.Has basic weight 290g/m by this raw material with the experiment machine preparation of making hand-made paper
2The scraps of paper, be dried to 110 ℃ with rotary drier then.This hand-made paper is assessed as molding base paper and by the mode identical with embodiment 1-1.
＜comparative example 1-2 〉
Assessment is undertaken by the mode identical with embodiment 1-1, and different is with producing filter paper (trade name: standard filter paper No.2 with molding base paper; The product of Advantech Toyo (KK); Basic weight: 125g/m
2) replace.
＜comparative example 1-3 〉
Assessment is undertaken by the mode identical with embodiment 1-1, and different is with molding base paper K lining (trade name: NRK 280, Oji Paper Co., Ltd. product, basic weight: 280g/m
2) replace.
＜comparative example 1-4 〉
Assessment is undertaken by the mode identical with embodiment 1-1, and different is with the body paper (product of Shin-Fuji Seishi (KK) of molding base paper to be used for cup; Basic weight: 290g/m
2) replace.
(appraisal procedure)
(1) TENSILE STRENGTH
Will be by under 23 ℃ and 50%RH condition, keeping at least 24 hours in test piece that flow direction and transverse cuts test paper obtain to width 15mm and length 250mm respectively to control its moisture.Use Strograph M2 tester (Toyo Seiki Seisaku-sho, the product of Ltd.) under pulling speed 20mm/min, to measure the TENSILE STRENGTH of this test piece according to JIS-P 8113 then.
(2) extension at break
Will be by under 23 ℃ and 50%RH condition, keeping at least 24 hours in test piece that flow direction and transverse cuts test paper obtain to width 15mm and length 250mm respectively to control its moisture.Use Strograph M2 tester (Toyo Seiki Seisaku-sho, the product of Ltd.) under pulling speed 20mm/min, to measure the extension at break of this test piece according to JIS-P 8113 then.
(3) critical compressive stress
Will be by under 23 ℃ and 50%RH condition, keeping at least 24 hours in test piece that flow direction and transverse cuts test paper obtain to width 12.7mm and length 152.4mm respectively to control its moisture.Then, measure the compressive strength A of test piece according to JIS-P 8126 with digital rings crushing tester X-1104 (product of (KK) Orientech).In addition, in measuring the compressive strength step, measure the area B of test piece load part.Critical compressive stress calculates according to following formula:
Critical compressive stress=A/B
Wherein the unit of critical compressive stress is MPa, and the unit of compressive strength is N, and the area of test piece load part calculates according to following formula:
(thickness of test piece) (mm) * 152.4mm
Wherein the thickness of test piece according to JIS-P 8118 by at least 24 hours the sample determination that contains moisture of control under 23 ℃ and 50%RH condition.
(4) compressive deformation
With the control at least 24 hours under 23 ℃ and 50%RH condition of the moisture of 50mm * 50mm test piece.Be to draw stress one inflection curves, with each test piece with Strograph M2 tester (ToyoSeiki Seisaku-sho, the product of Ltd.) at thickness direction with compression speed 1.0mm/min lower compression, thus at compression stress 20kgf/cm
2Following mensuration compression (deformation).
(5) mouldability
Molding base paper is depicted 24 lines form the blank sheet material of molding, as shown in Figure 8.Should comprise compression pressure 35kgf/cm with mould and plasticator by the blank sheet material
2, be molded as pallet under 150 ℃ of compression temperatures and 5 seconds the condition of compression time, the pallet of formation (having the about 20cm of main shaft, countershaft 14cm and highly about 4cm) is as shown in Figure 9.
Mouldability is according to following three standard tests:
Zero: the product that sheet material can be molded as pallet shape and acquisition has smooth surface.
△: although this sheet material mouldable be the pallet shape, the product that obtains has rough surface in folding wrinkling part especially.
*: blank sheet material breaks in molding step, causes preparing the mechanograph of pallet shape.
Test result as shown in Table 1 and Table 2.
Table 1
| Molding base paper | Basic weight (g/m 2) | |
| Embodiment 1-1 | NBKP/TMP/NUKP | 336 |
| Embodiment 1-2 | The LBKP+NBKP+ blowing agent | 156 |
| Embodiment 1-3 | NBKP hand-made paper | 255 |
| Embodiment 1-4 | TMP hand-made paper | 282 |
| Comparative example 1-1 | Crimped fibre/TMP | 290 |
| Comparative example 1-2 | The No.2 filter paper | 132 |
| Comparative example 1-3 | NRK 280 | 274 |
| Comparative example 1-4 | The body paper that is used for cup | 289 |
Table 1 (continuing)
| Thickness (mm) | Density | The basic weight of each layer | The density of each layer | |
| Embodiment 1-1 | 0.642 | 0.52 | NBKP | 0.70 |
| TMP | 0.48 | |||
| NUKP | 0.70 | |||
| Embodiment 1-2 | 0.997 | 0.16 | ||
| Embodiment 1-3 | 0.493 | 0.52 | ||
| Embodiment 1-4 | 0.970 | 0.29 | ||
| Comparative example 1-1 | 1.040 | 0.28 | ||
| Comparative example 1-2 | 0.281 | 0.47 | ||
| Comparative example 1-3 | 0.335 | 0.82 | ||
| Comparative example 1-4 | 0.327 | 0.88 |
Table 2
| TENSILE STRENGTH (kN/m) | Extension at break (%) | Critical compressive stress (MPa) | Compressive deformation (%) | Mouldability | ||||
| MD | CD | MD | CD | MD | CD | |||
| Embodiment 1-1 | 19.7 | 9.4 | 2.4 | 5.7 | 7.8 | 5.7 | 17 | ○ |
| Embodiment 1-2 | 2.4 | 2.8 | 1.1 | 74 | ○ | |||
| Embodiment 1-3 | 7.3 | 4.4 | 3.5 | 11 | ○ | |||
| Embodiment 1-4 | 6.4 | 2.7 | 1.7 | 20 | ○ | |||
| Comparative example 1-1 | 6.2 | 3.4 | 1.4 | 3.0 | 1.9 | 1.4 | 36 | × |
| Comparative example 1-2 | 3.4 | 1.7 | 1.4 | 3.3 | 3.7 | 2.6 | 22 | × |
| Comparative example 1-3 | 16.8 | 7.3 | 2.4 | 6.5 | 14.8 | 11.0 | 10 | △ |
| Comparative example 1-4 | 23.1 | 9.9 | 2.6 | 8.3 | 15.8 | 11.6 | 8.4 | △ |
Apparent from table 1 and 2, molding base paper sheet of the present invention has good mouldability, because they do not chap, and its folding wrinkling part can not become inhomogeneous in molding step.
＜embodiment 2-1 〉
Following three kinds of paper pulp (1) to (3) are mixed under the on-line velocity 300m/min in the following order with the directed paper machine of the experiment of Kumagai Riki Kogyo, prepare mixed paper thus.
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) has the commercial pine TMP of 350mlcsf, 180g/m
2
(3) has the commercial NBKP of 450mlcsf, 50g/m
2
(these raw materials are pulled an oar to the predetermined free degree with the high dense disk refiner type of KRK of Kimagai Riki Kogyo)
In this lamination, 2.0% starch aqueous dispersion (product of OLN510:Oji Corn Starch) is sprayed on the surface (felt one side) of layer, it is 1.0g/m that quantity for spray should make the solid on it
2These layers are combined together to form laminate.
The wet laminate that so forms is positioned between single plastics canvas (product of Shikishima Canvas Co.), and is used for calender (product of Yuri Roll Machine) and under clamp pressure 10kg/cm, suppresses with speed 30m/min.
Then, this sheet material is used for iron plate type cylinder heat drier drying.
The moisture of sheet material 20% and the condition of 65%RH under control, and handle under clamp pressure 20kg/cm with speed 20m/min with calender (product of Yuri RoruKikai).8.0%PVA (Kuraray POVAL PVA-KL 118:Kuraray Co., the product of Ltd.) is applied on the sheet material with hand, and coating weight is 2.0g/m
2Then, this sheet material is being handled under clamp pressure 20kg/cm with speed 20m/min under 120 ℃ with calender (product of Yuri Roll Machine), obtained molding base paper thus.
The moisture of this molding base paper 20% and the condition of 65%RH under control, measure its basic weight, thickness, density and Z intensity Taber hardness then.
In addition, the polypropylene film that will have thickness 40 μ m is depressed into by the melt extruding layer on the surface of molding base paper, obtains to be used to produce the sheet material of molding base paper container thus.
Mold pressing goes out the blank sheet material of an ellipse from this sheet material.As shown in Figure 8, be provided at the blank sheet material that both sides all have line of weakness 10 with radial.
With the blank sheet material that so obtains with test plasticator (product of Dai-Ichi Koki) at 130 ℃ at 35kg/cm
2Be used to form hot pressing in a pair of mold of ellipse pallet and the bed die down, obtain to have the paper container (referring to Fig. 9) of the about 20cm of main shaft, the about 14cm of countershaft and the about 4cm of the degree of depth thus.
Will be by to (the Oji Ace A of 7% starch in water; The product of Oji Corn Starch Co.) gel liquid that obtains 70 ℃ of following gelations is cooled to environment temperature, and is used to replace food.This gel liquid of 250g is added in the molded paper container.The paper container that confirms to contain this gel liquid container body and bottom obviously not the shape of swelling and container normal after, the opening edge of container is covered and puts into refrigerator with polyethylene film.After leaving standstill 12 hours under 5 ℃, the container body of molded paper container and the swelling degree of bottom are judged by the following method with this container.
＜embodiment 2-2 〉
Prepare in conjunction with paper by the mode identical with embodiment 2-1, different is: use three kinds of paper pulp given below, make dry back form 9.0g/m on the surface with manual being applied to of Mayer rod coating liquid given below
2Priming coat and 10.0g/m
2Finishing coat and with this laminated paper under 105 ℃ in hot air dryer (product of Advantech KK) dry 60 seconds.
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) the pine TMP/ with 300mlcsf has the commercial NBKP (70/30) of 150mlcsf, in conjunction with freedom: 280mlcsf, 230g/m
2
(3) has the commercial NBKP of 450mlcsf, 50g/m
2
[coating composition]
Coating materials: kaolin (Ultrawhite 90:Engelheart Co. product)/calcium carbonate (Brilliant 15:Shiraishi Kogyo product)/titanium dioxide (TCA333:Tokemu product)=50/35/15 and latex (L1410:Asahi Chemical Industry Co., Ltd. product)=15/5 (weight portion of solid; Below suitable equally).
Priming coat: kaolin (Kaobright:Thiele Co. product)/calcium carbonate (Softon 2200:Bihoku-Funka product)=50/50 and latex (0668:JSR product)/urea starch phosphate (MS4600:Nihon Shokuhin Kako Co., Ltd. product)=15/5.
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
＜embodiment 2-3 〉
Prepare in conjunction with paper by the mode identical with embodiment 1, different is: use three kinds of paper pulp given below:
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) have the paper pulp that the mercerising of 300mlcsf handles/the have commercial NBKP (70/30) of 150mlcsf, in conjunction with freedom: 250mlcsf, 200g/m
2
(3) has the commercial NBKP of 450mlcsf, 50g/m
2
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
＜embodiment 2-4 〉
Prepare in conjunction with paper by the mode identical with embodiment 1, different is: use three kinds of paper pulp given below:
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) the commercial NBKP/ with 150mlcsf has the crimped fibre (Weyerhauser) (70/30) of 750mlcsf, in conjunction with freedom: 300mlcsf, 160g/m
2
(3) has the commercial NBKP of 450mlcsf, 40g/m
2
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
＜embodiment 2-5 〉
Prepare in conjunction with paper by the mode identical with embodiment 2-1, different is: use three kinds of paper pulp given below:
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) has the mestha TMP of 350mlcsf, 185g/m
2
(3) has the commercial NBKP of 380mlcsf, 50g/m
2
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
＜reference example 2-1 〉
Prepare paper by the mode identical with embodiment 2-1, different is only to use a kind of paper pulp given below to form only one deck:
(1) has the commercial NBKP of 450mlcsf, 350g/m
2
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
＜reference example 2-2 〉
Prepare paper by the mode identical with embodiment 2-1, the different two kinds of paper pulp given below that are to use form two-layer:
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) has the radiation TMP of 350mlcsf, 250g/m
2
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
＜reference example 2-3 〉
Prepare paper by the mode identical with embodiment 1, different is only to use a kind of paper pulp given below to form only one deck:
(1) has the commercial NBKP of 450mlcsf, 360g/m
2
Prepare molding base paper and molded paper container by the mode identical with embodiment 2-1.Measure and assess and undertaken by mode same as described above.
Mensuration in top embodiment and the comparative example and assessment result provide in table 3 and 4.
Appraisal procedure is as follows:
[density of each ply of paper]
These layers are separated from each other by the splitting method of describing in the interlaminar strength test in conjunction with cardboard according to JIS P 8139, and measure the thickness and the basic weight (g/m of its each layer
2).
Because each peel ply is a fine hair shape and thicker than actual (real) thickness because of napping, therefore the thickness for each peel ply of calibration calculates correlation factor according to following formula, and calculates the density of this layer:
Correction factor=(the unbroken layer thickness before peeling off)/(gross thickness of the layer after peeling off)
The splitting method peel ply of describing in the interlaminar strength test of adopting according to JIS P 8139 at laminated paper board at need, this was flooded 1 hour in 60 ℃ water in conjunction with samples of sheets, then this sample is divided into superficial layer, intermediate layer and back layer by peeling off.With the equivalent layer drying that so obtains, and measure the thickness and the basic weight (g/m of its each layer
2).Then, thus proofread and correct the thickness of each layer and calculate the density of this layer by the calculation correction factor as mentioned above.
[evaluation of main body swelling speed]
Measure the main body middle part circumference of paper pallet.Calculate the poor of circumference of in normal condition, measuring before the test and the circumference of measuring after 12 hours, calculate the swelling speed of main body then.
Main body swelling speed (%)=[(circumference at main body middle part after 12 hours)-(circumference at main body middle part before the evaluation test)]/(circumference at main body middle part before the evaluation test)
Main body swelling speed is higher than 3.0% be evaluated as * *, main body swelling speed at 1.5 to 3.0% scope inner evaluations is *, main body swelling speed is lower than 1.5% and is evaluated as zero.
Table 3
| Embodiment No. | Molding methods | Layer | The paper pulp combination | Total basic weight (g/m 2) |
| 2-1 | Compacting | Top layer | NBKP | 310 |
| The intermediate layer | TMP | |||
| Backing layer | NBKP | |||
| 2-2 | Compacting | Top layer | NBKP | 310 |
| The intermediate layer | N material TMP+NBKP | |||
| Backing layer | NBKP | |||
| 2-3 | Compacting | Top layer | NBKP | 310 |
| The intermediate layer | Paper pulp+NBKP that mercerising is handled | |||
| Backing layer | NBKP | |||
| 2-4 | Compacting | Top layer | NBKP | 260 |
| The intermediate layer | NBPK+CF | |||
| Backing layer | NBKP | |||
| 2-5 | Compacting | Top layer | NBKP | 260 |
| The intermediate layer | Mestha TMP | |||
| Backing layer | NBKP |
Annotate: " N material " is meant pine and cypress tree material.
Table 3 (continuing)
| Embodiment No. | Basic weight (the g/m of each layer 2) | Density (the g/cm of unbroken layer 3) | Density (the g/cm of each layer 3) | Hardness (g.cm) | The main body swelling |
| 2-1 | 50 | 0.55 | 0.80 | 410 | ○ |
| 200 | 0.50 | ||||
| 50 | 0.80 | ||||
| 2-2 | 50 | 0.60 | 0.80 | 375 | ○ |
| 200 | 0.52 | ||||
| 50 | 0.80 | ||||
| 2-3 | 50 | 0.60 | 0.80 | 360 | ○ |
| 200 | 0.52 | ||||
| 50 | 0.80 | ||||
| 2-4 | 50 | 0.55 | 0.80 | 285 | ○ |
| 160 | 0.50 | ||||
| 40 | 0.80 | ||||
| 2-5 | 50 | 0.55 | 0.80 | 410 | ○ |
| 185 | 0.50 | ||||
| 50 | 0.80 |
Table 4
| Reference example No. | Molding methods | Layer | The paper pulp combination | Total basic weight (g/m 2) |
| 2-1 | Compacting | Top layer | NBKP | 360 |
| The intermediate layer | Do not have | |||
| Backing layer | Do not have | |||
| 2-2 | Compacting | Top layer | NBKP | 260 |
| The intermediate layer | NBKP | |||
| Backing layer | Do not have | |||
| 2-3 | Compacting | Top layer | NBKP | 370 |
| The intermediate layer | Do not have | |||
| Backing layer | Do not have |
Table 4 (continuing)
| Reference example No. | Basic weight (the g/m of each layer 2) | Density (the g/cm of unbroken layer 3) | Density (the g/cm of each layer 3) | Hardness (g.cm) | The main body swelling |
| 2-1 | 350 | 0.80 | 0.80 | 200 | × |
| Do not have | Do not have | ||||
| Do not have | Do not have | ||||
| 2-2 | 50 | 0.80 | 0.80 | 150 | × |
| 200 | 0.80 | ||||
| Do not have | Do not have | ||||
| 2-3 | 360 | 0.80 | 0.80 | 210 | × |
| Do not have | Do not have | ||||
| Do not have | Do not have |
＜embodiment 3-1 〉
The molding base paper that will obtain by the mode identical with embodiment 2-1 is 12% with steam treatment to control its moisture.Extrude an oval blank sheet material from blank body paper patrix.And this sheet material is provided with radial delineation line in both sides, as shown in Figure 8.
With the blank sheet material that so obtains be used to form the paper pallet a pair of up and down between the mould with test plasticator (product of Dai-Ichi Koki) under 130 ℃ at 35kg/cm
2Under add hot pressing, obtain to have height 4cm thus and have length 18.6cm and the paper pallet that is almost rectangular aperture of width 12.6cm, as shown in figure 10.This pallet also has the wide edge of a 0.7cm.So have crooked sidewall and the bending area between sidewall and bottom by the pallet container that obtains that stretches.
The pallet that obtains has 115 ° of cone angles (φ), radius of curvature (r) 2cm and floor space (S1) 72cm
2Therefore, H/ (S1)
1/2Be 0.47, r/ (S1)
1/2Be 0.24 and H/ (S1)
1/2Be 0.26.
The swellbility of the tray main body that obtains by stretching is according to mensuration as described below.
＜embodiment 3-2 〉
Obtain molding base paper by the mode identical with embodiment 2-2.Obtain blank sheet material by the mode identical, be not both with embodiment 3-1: this blank sheet material be shaped as squarish, its angle is circular, adopts a pair of mould up and down that is used to form square container, the moisture of blank sheet material be 15% and molding temperature be 140 ℃.
So, obtain to be almost square pallet by stretching, as shown in figure 11.This pallet has the opening that is almost rectangle of height 2.8cm and each side length 8cm of opening.This pallet also has the bending area between the wide edge of a 1cm, a crooked sidewall and this sidewall and the bottom.
The pallet that obtains has 113 ° of cone angles (φ), radius of curvature (r) 1.3cm and floor space (S1) 20cm
2Therefore, H/ (S1)
1/2Be 0.62, r/ (S1)
1/2Be 0.29 and H/ (S1)
1/2Be 0.35.
To estimating by the mode identical with embodiment 3-1 by the tray main body that obtains that stretches.
＜embodiment 3-3 〉
Prepare in conjunction with paper by the mode identical with embodiment 3-1, different is: use three kinds of paper pulp given below:
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) the hard loose TMP/ with 350mlcsf has the commercial LBKP (70/30) of 350mlcsf, in conjunction with after freedom: 350mlcsf, 200g/m
2
(3) has the commercial NBKP of 380mlcsf, 50g/m
2
Prepare molding base paper by the mode identical with embodiment 3-1.Under 20 ℃ and 65%RH, behind the control moisture, measure basic weight, thickness and the density of paper.
The surface (inner surface of container) of body paper by mode identical with embodiment 3-1 and the polypropylene film lamination with thickness 40 μ m, is obtained to be used to form the blank sheet material of container thus.
Then, should the blank sheet material by the mode molding identical with embodiment 1, different is: this blank sheet material is for circular, and mechanograph is bowl-shape, the moisture of blank sheet material be 13% and molding temperature be 120 ℃.So the bowl that obtains by stretching has the opening of height 5.5cm and diameter 12cm, as shown in figure 12.This pallet also has the bending area between the wide edge of a 0.8cm, a crooked sidewall and this sidewall and the bottom.
The pallet that obtains has 114 ° of cone angles (φ), radius of curvature (r) 1cm and floor space (S1) 28cm
2Therefore, H/ (S1)
1/2Be 1.03, r/ (S1)
1/2Be 0.19 and H/ (S1)
1/2Be 0.52.
The assessment result of embodiment 3-1 to 3-3 provides in table 5.
Table 5
| Embodiment No. | Layer | The paper pulp combination | Total basic weight (g/m 2) |
| 3-1 | Top layer | NBKP | 310 |
| The intermediate layer | TMP | ||
| Backing layer | NBKP | ||
| 3-2 | Top layer | NBKP | 330 |
| The intermediate layer | N material TMP+NBKP | ||
| Backing layer | NBKP | ||
| 3-3 | Top layer | NBKP | 310 |
| The intermediate layer | N material TMP+LBKP | ||
| Backing layer | NBKP |
Table 5 (continuing)
| Embodiment No. | Basic weight (the g/m of each layer 2) | Density (the g/cm of unbroken layer 3) | Density (the g/cm of each layer 3) | The main body swelling | Extension at break (MD/CD) (%) |
| 3-1 | 50 | 0.55 | 0.80 | ○ | 3.4/6.9 |
| 200 | 0.50 | ||||
| 50 | 0.80 | ||||
| 3-2 | 50 | 0.60 | 0.80 | ○ | 2.9/6.3 |
| 200 | 0.52 | ||||
| 50 | 0.80 | ||||
| 3-3 | 50 | 0.60 | 0.80 | ○ | 2.4/5.2 |
| 200 | 0.52 | ||||
| 50 | 0.72 |
＜embodiment 4-1〉(outer influence on body paper)
Use the collar plate shape refiner, commercial NBKP is pulled an oar to 550mlcsf (Tappi T-227, Canadian standard), and the loose TMP of heavily fortified point is pulled an oar to 300mlcsf.By these raw materials, prepare by two-layer in conjunction with paper machine with multilayer, i.e. ground floor 40g/m
2NBKP and second layer 250g/m
2The paper carrier that TMP forms.Stretching brown paper (Oji Paper Co., Ltd., basic weight: 75g/m with bleaching
2) impose on the paper carrier as outer layer sheet, obtain molding base paper thus.Carry out combination as follows: with 20g/m
2(by solid) EVA Emulsion Adhesive (trade name: Vinisol 1412KAI:Daido Kasei product) impose on the TMP laminar surface of cardboard with the Mayer rod.The stretching brown paper that to bleach with the hand roller immediately is pressed on the undried coating then.After under 110 ℃ dry 20 seconds, the molding base paper that so obtains is carried out following test, with hot air dryer to measure its extension at break and mouldability.
In the case, do not have outer field multilayer body paper and have structure as lower floor.
| The paper pulp kind | Density (g/m 3) | Basic weight (g/m 2) | |
| Top layer | NBKP | 0.70 | 40 |
| Backing layer | TMP | 0.48 | 250 |
| Total layer | - | 0.50 | 290 |
＜embodiment 4-2 〉
Prepare and assess molding base paper by the mode identical with embodiment 4-1, different is: will impose on skin on the paper carrier with bag of cement with unbleached stretching brown paper (Oji Paper Co., Ltd., basic weight: 83g/m
2) replace.
＜embodiment 4-3 〉
Prepare and assess molding base paper by the mode identical with embodiment 4-1, different is: will contain 180g/m
2Paper carrier the second layer and to impose on the stretching brown paper that the skin on the paper carrier uses with adhesive tape and replace.
(appraisal procedure)
(1) extension at break
Will be by under 23 ℃ and 50%RH condition, keeping at least 24 hours in blank test piece that flow direction and transverse cuts test paper obtain to width 15mm and length 250mm respectively to control its humidity.Use Strograph M2 tester (Toyo Seiki Seisaku-sho, the product of Ltd.) under pulling speed 20mm/min, to measure the TENSILE STRENGTH of this test piece according to JIS-P 8113 then.
(2) mouldability
With sheet material by being 12% to control its humidity with steam treatment.Extrude annular blank sheet material from this sheet material patrix.The blank sheet material that so obtains is tested plasticator (product of Dai-Ichi Koki) at 130 ℃ and 35kgf/cm a pair of the using between the mould up and down that is used to form cup shape pallet
2Following hot pressing obtains to have the cup shape container at the annular end of the annular opening of height 7cm, diameter 12cm and diameter 6cm thus.This container also has the bending area between the wide edge of a 0.8cm, a crooked sidewall and this sidewall and the bottom.Molding is that the such mode of container outer surface is carried out by the outer layer surface of the sheet material that makes formation.Mouldability is according to following assessment:
Zero: sheet material can be molded as cup, each moulding article skin do not break and each molded article surface smooth.
△: sheet material is mouldable to be cup, but the skin of cup breaks.
*: blank sheet material breaks in molding step, and causing can not molded cups.
Assessment result provides in table 6.
| Embodiment 4-1 | Embodiment 4-2 | Embodiment 4-3 | ||
| Outer layer sheet | Kind | The stretching brown paper of bleaching | Bag of cement is with unbleached stretching brown paper | Adhesive tape stretching brown paper |
| Basic weight (g/m 2) | 75 | 83 | 73 | |
| Density (g/m 3) | 0.72 | 0.60 | 0.68 | |
| Extension at break (%) MD CD | 9.0 7.9 | 6.5 7.9 | 7.4 8.9 | |
| Basic weight (the g/m of body paper 2) | 292 | 292 | 225 | |
| Total body paper | Basic weight (g/m 2) | 387 | 396 | 320 |
| Density (g/m 3) | 0.56 | 0.54 | 0.60 | |
| Mouldability | ○ | ○ | ○ | |
Apparent from table 6, molding base paper mouldability of the present invention is good because even when dark molding formation cup or its analog, the paper superficies are not broken or break in molding step yet.
＜embodiment 5-1 〉
Obtain molding base paper by the mode identical with embodiment 2-1.
[measuring outer density]
These layers are separated from each other by the splitting method of describing in the interlaminar strength test in conjunction with cardboard according to JIS P 8139, and measure the thickness and the basic weight (g/m of its each layer
2).
Because each peel ply is a fine hair shape and thicker than actual (real) thickness because of napping, therefore is to calibrate the thickness of each peel ply according to the following formula calculation correction factor, and calculates the density of this layer:
Correction factor=(the unbroken layer thickness before peeling off)/(gross thickness of the layer after peeling off)
The splitting method peel ply of describing in the interlaminar strength test of passing through according to JIS P 8139 at laminated paper board at need, this was flooded 1 hour in 60 ℃ water in conjunction with samples of sheets, then this sample is divided into superficial layer, intermediate layer and back layer by peeling off.With the equivalent layer drying that so obtains, and measure the thickness and the basic weight (g/m of its each layer
2).Then, thereby proofread and correct the thickness of each layer, and calculate the density of this layer by the calculation correction factor as mentioned above.
[extruding layer platen press]
With Lab-plastomill (Toyo Seiki Co., Ltd. product) titanium dioxide is added in the polypropylene, the content that makes titanium dioxide is 10wt%.The mixture that obtains is imposed on the synthetic resin layer that forms thickness 30 μ m on the body paper surface by melt extrusion method.So, obtain to be used to form the body paper of container.
Mold pressing goes out the blank sheet material of an ellipse from this sheet material.As shown in Figure 8, should depict radial line of weakness by the blank sheet material.
Use test plasticator (product of Dai-Ichi Koki) at 130 ℃ and 35kg/cm the blank sheet material that so obtains
2Hot pressing in a pair of mold that is used to form the ellipse container and bed die down, acquisition has the paper container of the about 20cm of main shaft, the about 14cm of countershaft and the about 4cm of the degree of depth thus, as shown in Figure 9.
＜embodiment 5-2 〉
Prepare molding base paper and molded paper container by the mode identical with embodiment 5-1, different is: (1) becomes 8wt% with the content of titanium dioxide, and forms the synthetic resin layer with thickness 40 μ m to (3) three kinds of paper pulp below using:
(1) has the commercial NBKP of 450mlcsf, 50g/m
2
(2) the pine TMP/ with 300mlcsf has the commercial NBKP (70/30) of 150mlcsf, in conjunction with after freedom: 280mlcsf, 200g/m
2
(3) has the commercial NBKP of 450mlcsf, 50g/m
2
＜reference example 5-1 〉
Prepare molding base paper and molded paper container by the mode identical with embodiment 5-1, different is only uses polypropylene (product of SunAllomer:MSS) and forms the synthetic resin layer with thickness 30 μ m without titanium dioxide.
The mold container that obtains in embodiment and reference example is assessed as follows:
＜surperficial appraisal procedure 〉
Edge sampling to each mold container.Test its part (at vertical 20mm) with little aberration gauge R-30 (Nippon DenshokuKokyo).Measure aberration with 10.Spot diameter is 0.6mm.When R value (maximum with minimum of a value poor) is 10 or when higher, the result represents that with x when it was lower than at 10, the result was by zero expression.
Table 7
| Body paper | Synthetic resin | TiO 2 (wt％) | The surface | |||
| Basic weight | Density (skin) | Density (whole layer) | ||||
| g/m 2 | g/cm 3 | g/cm 3 | ||||
| Embodiment 5-1 | 250 | 0.80 | 0.50 | | 10 | ○ |
| Embodiment 5-2 | 300 | 0.80 | 0.60 | PP | 8 | ○ |
| Reference example 1 | 250 | 0.80 | 0.50 | PP | 0 | × |
＜embodiment 6-1 〉
Obtain molding base paper by the mode identical with embodiment 2-1.(trade name: Bionolle, Showa Highpolymer Co. Ltd.) extrude by melt and impose on this body paper surface the sheet material that forms thus as the molding base paper container will to have the aliphatic polyester of thickness 40 μ m.
Mold pressing goes out the blank sheet material of an ellipse from this sheet material.As shown in Figure 8, should depict radial line of weakness by the blank sheet material.
Use test plasticator (product of Dai-Ichi Koki) at 130 ℃ and 35kg/cm the blank sheet material that so obtains
2Hot pressing in being used to form a pair of upper and lower mould of ellipse container down, acquisition has the paper container of the about 20cm of main shaft, the about 14cm of countershaft and the about 4cm of the degree of depth thus, as shown in Figure 9.
＜reference example 6-1 〉
Prepare the molded paper container by the mode identical with embodiment 6-1, different is to replace with polypropylene to impose on the lip-deep aliphatic polyester of molding base paper to form laminated product.
Mensuration and assessment result in the foregoing description and the comparative example provide in table 8.
Appraisal procedure is as follows:
[biodegradable]
This molded paper container is embedded in the farmland 6 months, takes out and observe its degree of decomposition then.
Table 8
| Laminated resin | Keep the state after 6 months in the ground | |
| Embodiment 6-1 | Aliphatic polyester | This container only keeps a small amount of paper fiber, but does not have its primitive form |
| Reference example 6-1 | Polypropylene | Paper partly decomposes and laminated paper keeps fully |
Apparent from last table 8, use biodegradable resin to alleviate environmental pressure as the skin of substrate of the present invention.
Claims (14)
1, a kind of molding base paper comprises high-density layer and low-density layer, and wherein said high-density layer has density 0.7 to 0.9g/cm
3And described low-density layer has density and is lower than 0.7g/cm
3, described body paper has basic weight 100 to 500g/cm
2With density 0.4 to 0.7g/cm
3
2, according to the molding base paper of claim 1, wherein said low-density layer mainly comprises the paper pulp that is selected from mechanical pulp, crimped fibre and mercerization paper pulp.
3, according to the molding base paper of claim 2, wherein said low-density layer mainly is made up of mechanical pulp.
4, according to the molding base paper of claim 3, wherein said mechanical pulp is a thermomechanical pulp.
5,, further be included in the be full of cracks that its at least one surface has extension at break at least 5% and prevent layer according to any one molding base paper of claim 1 to 4.
6, according to the molding base paper of claim 5, wherein said extension at break is at least 6%.
7, according to the molding base paper of claim 5, wherein said be full of cracks prevents that layer has basic weight at least 50 to 150g/m
2
8,, further be included in its at least one lip-deep synthetic resin layer according to the molding base paper of claim 5.
9, molding base paper according to Claim 8, wherein said synthetic resin are selected from polyethylene, polypropylene, polymethylpentene, polyethylene terephthalate, polybutylene terephthalate (PBT), polyamide, ethylene/vinyl alcohol copolymer, polystyrene resin and polyacrylonitrile resin.
10, molding base paper according to Claim 8, wherein said synthetic resin are the biodegradable thermoplastic resin that is selected from 3-butyric ester/3-hydroxyl pentanoate copolymer, 3-hydroxybutyric acid ester polymer, polycaprolactone, poly-glycolide, polyvinyl alcohol, polyvinyl alcohol/composites of starch and cellulose derivative.
11, molding base paper according to Claim 8, wherein said synthetic resin further comprises pigment.
12, according to the molding base paper of claim 11, wherein said pigment is selected from calcium carbonate, kaolin, clay, talcum, titanium dioxide and plastics.
13, a kind of molded paper container is by formed by stretching according to each molding base paper of claim 1 to 12.
14, according to the molded paper container of claim 13, it satisfies following formula:
0.15≤H(S2)
1/2
Wherein S2 is the aperture area of container top, and H represents height.
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|---|---|---|---|
| JP341167/2000 | 2000-10-03 | ||
| JP2000341167 | 2000-10-03 | ||
| JP323065/2000 | 2000-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01141644A Division CN1351213A (en) | 2000-10-03 | 2001-09-29 | Moulded paper and moulded paper container therefrom |
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| CN100338309C true CN100338309C (en) | 2007-09-19 |
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| CN104015451A (en) * | 2014-06-09 | 2014-09-03 | 比勒鲁迪克斯那斯公司 | Carton board |
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| CA2930029A1 (en) * | 2013-12-04 | 2015-06-11 | Billerudkorsnas Ab | Sealable package and production thereof |
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|---|---|---|---|---|
| CN104015451A (en) * | 2014-06-09 | 2014-09-03 | 比勒鲁迪克斯那斯公司 | Carton board |
| CN104015451B (en) * | 2014-06-09 | 2019-11-22 | 比勒鲁迪克斯那斯公司 | Carton board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1763313A (en) | 2006-04-26 |
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