CN103806326A - Liquid packaging body paper board and preparation method thereof - Google Patents
Liquid packaging body paper board and preparation method thereof Download PDFInfo
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- CN103806326A CN103806326A CN201410048593.9A CN201410048593A CN103806326A CN 103806326 A CN103806326 A CN 103806326A CN 201410048593 A CN201410048593 A CN 201410048593A CN 103806326 A CN103806326 A CN 103806326A
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Abstract
The invention provides a liquid packaging body paper board and a preparation method thereof. The liquid packaging body paper board consists of a backing paper layer, a core paper layer, a surface paper layer and a coating layer which are stacked in sequence, wherein the backing paper layer is prepared from the following raw materials in percentage by weight: 80-100 percent of unbleached sulfate pulp and 0-20 percent of non-dried chemical broad-leaf fresh pulp; the core paper layer is prepared from the following raw materials in percentage by weight: 10-20 percent of non-dried chemical broad-leaf fresh pulp, 50-80 percent of unbleached sulfate pulp and 5-30 percent of mechanical pulp; the surface paper layer is prepared from the following raw materials in percentage by weight: 20-80 percent of non-dried chemical broad-leaf fresh pulp and 20-80 percent of chemical needle-leaf pulp. Compared with the prior art, the liquid packaging body paper board has the advantages that the non-dried chemical broad-leaf fresh pulp is added into paper pulp of the backing paper layer, the core paper layer and the surface paper layer, and due to the specific high intensity and high stiffness as well as the high fiber bonding strength of the non-dried fresh pulp, the stiffness and the intensity of the liquid packaging body paper board are improved under a condition that the amount is fixed and is not increased; the liquid packaging body paper board has less-damage performance.
Description
Technical field
The invention belongs to soft package paper technical field, relate in particular to a kind of flexible package punch base board and preparation method thereof.
Background technology
Along with social progress, improving constantly of living standards of the people, masses' consumption idea is being constantly updated, in addition gigantic and vigorous environmental protection campaign in global range, make to there are materials few, discarded object is low, the flexible package demand that is easy to reclaiming increases day by day, flexible package industrial expansion, inevitable demand is more packed base board, China's flexible package punch base board major part also depends on import at present, therefore, the further production of research and exploration flexible package punch base board, make China produce voluntarily flexible package punch base board, it is the important topic that domestic paper-making industry is faced.
Flexible packing container for liquid have cost low, economize on resources, be convenient to reclaim, regeneration, and the advantage such as can degrade voluntarily, and it is good to have machining property, can adapt to the large production of high speed machineization, is easy to printing, is beneficial to preservation, nontoxic advantage when use.Flexible packing container for liquid generally forms by seven layers, is respectively polyethylene (two-layer), aluminium foil, polyethylene, base board, printing-ink and polyethylene (or wax layer) from the inside to the outside.
Commodity packaging to play protection commodity, prevent qualitative change, the effect of ensuring the quality of products, through printing after commodity packaging to play beautify commodity, explanation commodity and publicity commodity effect.Commodity will pass through the links such as packing, transportation, sale in the whole process of circulation, require packaging material will have characteristic corresponding thereto in each link.Base board, as the main body of liquid soft package material, accounts for 80% of whole packaging material, and therefore the performance of base board has important impact to the performance of liquid soft package material.
Liquid soft package material to the performance requirement of base board is: the mechanical strength that (1) is higher and suitable strength ratio in length and breadth; The base board starch adhesive of producing now is generally used chemical pulp, and core slurry useization machine slurry, to guarantee that base board has good mechanical strength; (2) higher deflection; The flexible packing material of various shapes, all requires carton to have certain counter-bending ability after packing liquid material, can keep original shape separately, and the deflection of cardboard is except with its thickness, tightness with quantitatively have substantial connection, also relevant with the coefficient of elasticity of slurry; (3) higher compressive resistance etc.
Because mostly the paper pulp of existing packaging material base board is to be made up of change machine wood pulp after drying and the chemical wood pulp of bleaching, and dried fiber bonding strength is bad, for keeping deflection and the intensity of base board, cause the quantitatively often higher of base board, fiber environmental pressure is also larger, the present invention consider to provide a kind of equal quantitatively under, there is the flexible package punch base board of higher stiffness and higher-strength.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of flexible package punch base board, and this packing base board has higher deflection and intensity.
The invention provides a kind of flexible package punch base board, be made up of the ground paper layer superposeing successively, core paper layer, facial tissue layer and coating, described ground paper layer is made up of the unbleached kraft pulp of 80～100wt% and the fresh slurry of undried chemical broad-leaved of 0～20wt%; Described core paper layer is made up of the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt%; Described facial tissue layer is made up of the fresh slurry of undried chemical broad-leaved of 20～80wt% and the chemical needle slurry of 20～80wt%.
Preferably, the weight of described ground paper layer is 10～30% of flexible package punch base board weight.
Preferably, the weight of described core paper layer is 35～55% of flexible package punch base board weight.
Preferably, the weight of described facial tissue layer is 15～45% of flexible package punch base board weight.
Preferably, the weight of described coating is 7～16% of flexible package punch base board weight.
Preferably, described coating comprises precoated shet and finishing coat; Described precoated shet is between facial tissue layer and finishing coat.
Preferably, described finishing coat comprise in china clay, talcum powder and the titanium dioxide of calcium carbonate, 30～70 weight portions of 30～70 weight portions one or more, SA styrene-acrylic latex, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion of 13～20 weight portions.
Preferably, described coating also comprises core coating; Described core coating is between precoated shet and finishing coat.
Preferably, described precoated shet and core coating are composed of the following components independently of one another: in the calcium carbonate of 30～70 weight portions, china clay, talcum powder and the titanium dioxide of 30～70 weight portions one or more, 13～20 weight portion SBR carboxylic styrene butadiene latexs, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion.
The present invention also provides a kind of preparation method of flexible package punch base board, comprises the following steps:
After the unbleached kraft pulp of 80～100wt% is mixed with the fresh slurry of undried chemical broad-leaved of 0～20wt%, pass into the bottom head box of folded net paper machine;
After the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt% are mixed, pass into the sandwich layer head box of folded net paper machine;
After the fresh slurry of undried chemical broad-leaved of 20～80wt% is mixed with the chemical needle slurry of 20～80wt%, pass into the surface layer head box of folded net paper machine;
Through folded net paper machine three cascade net moulding, obtain thering is ground paper layer, the body paper of core paper layer and facial tissue layer;
After described body paper is dried for the first time, Coating, then after being dried for the second time, obtain flexible package punch base board.
The invention provides a kind of flexible package punch base board and preparation method thereof, this flexible package punch base board is made up of the ground paper layer superposeing successively, core paper layer, facial tissue layer and coating, and described ground paper layer is made up of the unbleached kraft pulp of 80～100wt% and the fresh slurry of undried chemical broad-leaved of 0～20wt%; Described core paper layer is made up of the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt%; Described facial tissue layer is made up of the fresh slurry of undried chemical broad-leaved of 20～80wt% and the chemical needle slurry of 20～80wt%.Compared with prior art, the present invention all adds the fresh slurry of undried chemical broad-leaved in the paper pulp of ground paper layer, core paper layer and facial tissue layer, utilize the feature of the not dry peculiar high strength of fresh slurry and high-stiffness, the bond strength of dry fresh slurry is not higher yet simultaneously, thereby make flexible package punch base board in the situation that quantitatively not increasing, increase deflection and intensity, and there is few crushing performance.
Experimental result shows, it is vertical/horizontal that flexible package punch base board deflection of the present invention can reach 6.7mN.m/3.1mN.m(), interfacial bonding strength can reach 190J/m
2, folding strength can reach 268 times/201 times (vertical/horizontal).
Accompanying drawing explanation
Fig. 1 is flexible package punch base board cross-sectional structure schematic diagram of the present invention.
The specific embodiment
The invention provides a kind of flexible package punch base board, be made up of the ground paper layer superposeing successively, core paper layer, facial tissue layer and coating, described ground paper layer is made up of the unbleached kraft pulp of 80～100wt% and the fresh slurry of undried chemical broad-leaved of 0～20wt%; Described core paper layer is made up of the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt%; Described facial tissue layer is made up of the fresh slurry of undried chemical broad-leaved of 20～80wt% and the chemical needle slurry of 20～80wt%.
The present invention does not have special restriction to the source of all raw materials, for commercially available.
Flexible package punch base board is made up of the ground paper layer superposeing successively, core paper layer, facial tissue layer and coating.The grammes per square metre of flexible package punch base board generally can be more than 170GSM, and wherein, the weight of described ground paper layer is preferably 10～30% of flexible package punch base board weight, and more preferably 10%～20%.
According to the present invention, described ground paper layer is made up of the unbleached kraft pulp of 80～100wt% and the fresh slurry of undried chemical broad-leaved of 0～20wt%.Described not bleached kraft pulp is not bleached kraft pulp well known to those skilled in the art, there is no special restriction, is preferably not bleached sulphate needle slurry in the present invention; The content of described not bleached kraft pulp is preferably 90～100wt%; The content of the fresh slurry of described undried chemical broad-leaved is preferably 0～10wt%.
Core paper layer is between ground paper layer and facial tissue layer, and in the present invention, the weight of described core paper layer is preferably 35～55% of flexible package punch base board weight, and more preferably 40～55%, then be preferably 50～55%.
Described core paper layer is made up of the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt%.Wherein, the content of the fresh slurry of described undried chemical broad-leaved is preferably 10～15wt%; Described unbleached kraft pulp is unbleached kraft pulp well known to those skilled in the art, there is no special restriction, is preferably and does not float sulfate needle slurry in the present invention; In core paper layer, the content of unbleached kraft pulp is preferably 60～80wt%, more preferably 65～75wt%; The content of described mechanical pulp is preferably 10～30wt%, more preferably 15～25wt%.
According to the present invention, described facial tissue layer is between core paper layer and coating, and the weight of described facial tissue layer is preferably flexible package punch base board weight 15～45%, and more preferably 20～30%.
Described facial tissue layer is made up of the fresh slurry of undried chemical broad-leaved of 20～80wt% and the chemical needle slurry of 20～80wt%.Wherein, the content of the fresh slurry of described undried chemical broad-leaved is preferably 30～70wt%, more preferably 40～60wt%; The content of described chemical needle slurry is preferably 30～70wt%, more preferably 40～60wt%.
The present invention all adds the fresh slurry of undried chemical broad-leaved in the paper pulp of ground paper layer, core paper layer and facial tissue layer, utilize the feature of the not dry peculiar high strength of fresh slurry and high-stiffness, the bond strength of dry fresh slurry is not higher yet simultaneously, thereby make flexible package punch base board in the situation that quantitatively not increasing, increase deflection and intensity, and there is few crushing performance.
Described coating is positioned at the one side that facial tissue layer does not contact with core paper layer, and the weight of described coating is preferably 7～16% of flexible package punch base board weight, and more preferably 10～15%.
Described coating is coating well known to those skilled in the art, there is no special restriction.In the present invention, described coating preferably includes precoated shet and finishing coat, and described precoated shet is between facial tissue layer and finishing coat.Now, the weight of described precoated shet is preferably 4～12% of flexible package punch base board weight, and more preferably 7～10%; The weight of described finishing coat is preferably 3～12%, and more preferably 5～8%.
Described precoated shet preferably include in china clay, talcum powder and the titanium dioxide of calcium carbonate, 30～70 weight portions of 30～70 weight portions one or more, 13～20 weight portion SBR carboxylic styrene butadiene latexs, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion.Wherein, described calcium carbonate is preferably 50～70 weight portions; The content of one or more in china clay, talcum powder and titanium dioxide is preferably 30～50 weight portions, more preferably 30～40 weight portions; Described SBR carboxylic styrene butadiene latex is preferably 15～20 weight portions; Described water repellent agent is water repellent agent well known to those skilled in the art, there is no special restriction, and its content is preferably 0.4～0.5 weight portion; Described lubricant is lubricant well known to those skilled in the art, there is no special restriction, and its content is preferably 0.2～0.4 weight portion.In the present invention, described precoated shet preferably also comprises defoamer; The content of described defoamer is preferably 0.01～0.1 weight portion, more preferably 0.01～0.05 weight portion, then be preferably 0.03～0.04 weight portion.
Described finishing coat preferably include in china clay, talcum powder and the titanium dioxide of calcium carbonate, 30～70 weight portions of 30～70 weight portions one or more, SA styrene-acrylic latex and/or SBR carboxylic styrene butadiene latex, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion of 13～20 weight portions; More preferably comprise in china clay, talcum powder and the titanium dioxide of calcium carbonate, 30～70 weight portions of 30～70 weight portions one or more, SA styrene-acrylic latex, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion of 13～20 weight portions.Wherein, described calcium carbonate is preferably 50～70 weight portions; The content of one or more in china clay, talcum powder and titanium dioxide is preferably 30～50 weight portions, more preferably 30～40 weight portions; Described SA styrene-acrylic latex is preferably 15～20 weight portions; Described water repellent agent is water repellent agent well known to those skilled in the art, there is no special restriction, and its content is preferably 0.4～0.5 weight portion; Described lubricant is lubricant well known to those skilled in the art, there is no special restriction, and its content is preferably 0.2～0.4 weight portion.In the present invention, described finishing coat preferably also comprises defoamer; The content of described defoamer is preferably 0.01～0.1 weight portion, more preferably 0.01～0.05 weight portion, then be preferably 0.03～0.04 weight portion.
According to the present invention, between described precoated shet and finishing coat, preferably also comprise core coating, as shown in Figure 1, wherein B is that ground paper layer, M are that core paper layer, T are that facial tissue layer, TC1 are that precoated shet, TC2 are that core coating, TC3 are finishing coat to the cross sectional representation of this flexible package punch base board.Now, the weight of described precoated shet is preferably 4～6% of flexible package punch base board weight; The weight of described core coating is preferably 4～6% of flexible package punch base board; The weight of described finishing coat is preferably 3～12%, and more preferably 5～8%.
Described core coating preferably include in china clay, talcum powder and the titanium dioxide of calcium carbonate, 30～70 weight portions of 30～70 weight portions one or more, 13～20 weight portion SBR carboxylic styrene butadiene latexs, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion.Wherein, described calcium carbonate is preferably 50～70 weight portions; The content of one or more in china clay, talcum powder and titanium dioxide is preferably 30～50 weight portions, more preferably 30～40 weight portions; Described SBR carboxylic styrene butadiene latex is preferably 15～20 weight portions; Described water repellent agent is water repellent agent well known to those skilled in the art, there is no special restriction, and its content is preferably 0.4～0.5 weight portion; Described lubricant is lubricant well known to those skilled in the art, there is no special restriction, and its content is preferably 0.2～0.4 weight portion.In the present invention, described core coating preferably also comprises defoamer; The content of described defoamer is preferably 0.01～0.1 weight portion, more preferably 0.01～0.05 weight portion, then be preferably 0.03～0.04 weight portion.
Because all adopting, ground paper layer and core paper layer do not float natural color pulp, and higher to facial tissue layer and the desired covering of coating, to avoid or to reduce the color spot phenomenon in flexible package punch base board front, guarantee that it has good printing performance.The present invention adds talcum powder and titanium dioxide in coating, makes coating have higher refractive index and higher covering performance, thereby has improved the printing performance of flexible package punch base board; The present invention adds SA styrene-acrylic latex in finishing coat, makes finishing coat have good retention of whiteness and lower smell, guarantees the requirement of flexible package punch base board to smell; In precoated shet and core coating, add and there is higher-strength SBR carboxylic styrene butadiene latex, make coating there is good flexibility, also make its anti-tensile and compression strength be improved, reduced flexible package punch base board and produce the possibility of alligatoring in follow-up filling formation process.
The present invention also provides a kind of preparation method of aforesaid liquid packing base board, comprises the following steps:
After the unbleached kraft pulp of 80～100wt% is mixed with the fresh slurry of undried chemical broad-leaved of 0～20wt%, pass into the bottom head box of folded net paper machine;
After the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt% are mixed, pass into the sandwich layer head box of folded net paper machine;
After the fresh slurry of undried chemical broad-leaved of 20～80wt% is mixed with the chemical needle slurry of 20～80wt%, pass into the surface layer head box of folded net paper machine;
Through folded net paper machine three cascade net moulding, obtain thering is ground paper layer, the body paper of core paper layer and facial tissue layer;
After described body paper is dried for the first time, Coating, then after being dried for the second time, obtain flexible package punch base board.
Wherein, the paper pulp in described bottom head box forms ground paper layer; Paper pulp in sandwich layer head box forms core paper layer; Paper pulp forming surface ply of paper in surface layer head box; Described ground paper layer, core paper layer, facial tissue layer are all same as above identical with coating, do not repeat them here.
Experimental result shows, it is vertical/horizontal that flexible package punch base board deflection of the present invention can reach 6.7mN.m/3.1mN.m(), interfacial bonding strength can reach 190J/m
2, folding strength can reach 268 times/201 times (vertical/horizontal).
In order to further illustrate the present invention, below in conjunction with embodiment, a kind of flexible package punch base board provided by the invention and preparation method thereof is described in detail.
In following examples, reagent used is commercially available.
Embodiment 1
Facial tissue layer is quantitatively 42g/m
2, the chemical bleaching needle pulpboard of the employing 50wt% fresh slurry of undried chemical bleaching broad-leaved and 50wt%; Core paper layer is quantitatively 115g/m
2, adopt the fresh slurry of the undried chemical bleaching broad-leaved of 10wt%, 70wt% not to float the chemical machinery pulpboard of sulfate needle pulpboard and 20wt%; Ground paper layer is quantitatively 21g/m
2, adopt 100wt% not float sulfate needle slurry; Above-mentioned pulpboard is mixed by said components through pulper size degradation respectively, screening, after fiberizer making beating, the fresh slurry coming with Pulping Line is after mixed stock tank mixes, enter respectively surface layer head box, sandwich layer head box and the bottom head box of folded net paper machine, again after folded net paper machine three cascade net moulding, obtain thering is facial tissue layer, the body paper of core paper layer and ground paper layer;
Body paper, after paper machine carries out front dry (dry for the first time), is coated with precoated shet, core coating and finishing coat successively on the surface of facial tissue layer, and the coating weight of precoated shet and core coating is 10g/m
2, constituent is: the SBR carboxylic styrene butadiene latex of the calcium carbonate of 70 weight portions, the china clay of 30 weight portions, 20 weight portions, the water repellent agent of 0.5 weight portion, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion; The coating weight of finishing coat is 12g/m
2, constituent is: the SBR carboxylic styrene butadiene latex of the calcium carbonate of 70 weight portions, the china clay of 30 weight portions, 20 weight portions, the water repellent agent of 0.5 weight portion, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion; Then carry out rear dry (dry for the second time), enter paper machine reeling end, by batching, multiple to turn that packing obtains be quantitatively 210g/m
2flexible package punch base board.
Physical property to the flexible package punch base board obtaining in embodiment 1 detects, and obtains in table 1.
Embodiment 2
Facial tissue layer is quantitatively 42g/m
2, the chemical bleaching needle pulpboard of the employing 50wt% fresh slurry of undried chemical bleaching broad-leaved and 50wt%; Core paper layer is quantitatively 115g/m
2, adopt the fresh slurry of the undried chemical bleaching broad-leaved of 10wt%, 70wt% not to float the chemical machinery pulpboard of sulfate needle pulpboard and 20wt%; Ground paper layer is quantitatively 21g/m
2, adopt 100wt% not float sulfate needle slurry; Above-mentioned pulpboard is mixed by said components through pulper size degradation respectively, screening, after fiberizer making beating, the fresh slurry coming with Pulping Line is after mixed stock tank mixes, enter respectively surface layer head box, sandwich layer head box and the bottom head box of folded net paper machine, again after folded net paper machine three cascade net moulding, obtain thering is facial tissue layer, the body paper of core paper layer and ground paper layer;
Body paper, after paper machine carries out front dry (dry for the first time), is coated with precoated shet, core coating and finishing coat successively on the surface of facial tissue layer, and the coating weight of precoated shet and core coating is 10g/m
2, constituent is: the SBR carboxylic styrene butadiene latex of the titanium dioxide of the calcium carbonate of 70 weight portions, the china clay of 20 weight portions, 5 weight portions, the talcum powder of 5 weight portions, 20 weight portions, water repellent agent, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion of 0.5 weight portion; The coating weight of finishing coat is 12g/m
2, constituent is: the SBR carboxylic styrene butadiene latex of the titanium dioxide of the calcium carbonate of 70 weight portions, the china clay of 15 weight portions, 10 weight portions, the talcum powder of 5 weight portions, 20 weight portions, water repellent agent, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion of 0.5 weight portion; Then carry out rear dry (dry for the second time), enter paper machine reeling end, by batching, multiple to turn that packing obtains be quantitatively 210g/m
2flexible package punch base board.
Physical property to the flexible package punch base board obtaining in embodiment 2 detects, and obtains in table 1.
Embodiment 3
Facial tissue layer is quantitatively 42g/m
2, the chemical bleaching needle pulpboard of the employing 50wt% fresh slurry of undried chemical bleaching broad-leaved and 50wt%; Core paper layer is quantitatively 115g/m
2, adopt the fresh slurry of the undried chemical bleaching broad-leaved of 10wt%, 70wt% not to float the chemical machinery pulpboard of sulfate needle pulpboard and 20wt%; Ground paper layer is quantitatively 21g/m
2, adopt 100wt% not float sulfate needle slurry; Above-mentioned pulpboard is mixed by said components through pulper size degradation respectively, screening, after fiberizer making beating, the fresh slurry coming with Pulping Line is after mixed stock tank mixes, enter respectively surface layer head box, sandwich layer head box and the bottom head box of folded net paper machine, again after folded net paper machine three cascade net moulding, obtain thering is facial tissue layer, the body paper of core paper layer and ground paper layer;
Body paper, after paper machine carries out front dry (dry for the first time), is coated with precoated shet, core coating and finishing coat successively on the surface of facial tissue layer, and the coating weight of precoated shet and core coating is 10g/m
2, constituent is: the SBR carboxylic styrene butadiene latex of the titanium dioxide of the calcium carbonate of 70 weight portions, the china clay of 20 weight portions, 5 weight portions, the talcum powder of 5 weight portions, 20 weight portions, water repellent agent, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion of 0.5 weight portion; The coating weight of finishing coat is 12g/m
2, constituent is: the SA styrene-acrylic latex of the titanium dioxide of the calcium carbonate of 70 weight portions, the china clay of 15 weight portions, 10 weight portions, the talcum powder of 5 weight portions, 20 weight portions, water repellent agent, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion of 0.5 weight portion; Then carry out rear dry (dry for the second time), enter paper machine reeling end, by batching, multiple to turn that packing obtains be quantitatively 210g/m
2flexible package punch base board.
Physical property to the flexible package punch base board obtaining in embodiment 3 detects, and obtains in table 1.
Comparative example 1
Facial tissue layer is quantitatively 42g/m
2, adopt the chemical bleaching broad-leaved pulpboard of 50wt% and the chemical bleaching needle pulpboard of 50wt%; Core paper layer is quantitatively 115g/m
2, adopt the chemical bleaching broad-leaved pulpboard of 10wt%, the chemical machinery pulpboard that 70wt% does not float sulfate needle pulpboard and 20wt%; Ground paper layer is quantitatively 21g/m
2, adopt 100wt% not float sulfate needle slurry; Above-mentioned pulpboard is mixed by said components through pulper size degradation respectively, screening, after fiberizer making beating, enter respectively surface layer head box, sandwich layer head box and the bottom head box of folded net paper machine, again after folded net paper machine three cascade net moulding, obtain thering is facial tissue layer, the body paper of core paper layer and ground paper layer;
Body paper, after paper machine carries out front dry (dry for the first time), is coated with precoated shet, core coating and finishing coat successively on the surface of facial tissue layer, and the coating weight of precoated shet and core coating is 10g/m
2, constituent is: the SA styrene-acrylic latex of the calcium carbonate of 70 weight portions, the china clay of 30 weight portions, 20 weight portions, the water repellent agent of 0.5 weight portion, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion; The coating weight of finishing coat is 12g/m
2, constituent is: the SA styrene-acrylic latex of the calcium carbonate of 70 weight portions, the china clay of 30 weight portions, 20 weight portions, the water repellent agent of 0.5 weight portion, the lubricant of 0.2 weight portion and the defoamer of 0.035 weight portion; Then carry out rear dry (dry for the second time), enter paper machine reeling end, by batching, multiple to turn that packing obtains be quantitatively 210g/m
2flexible package punch base board.
Physical property to the flexible package punch base board obtaining in comparative example 1 detects, and obtains in table 1.
The physical property testing result of table 1 flexible package punch base board
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a flexible package punch base board, is characterized in that, is made up of the ground paper layer superposeing successively, core paper layer, facial tissue layer and coating, and described ground paper layer is made up of the unbleached kraft pulp of 80～100wt% and the fresh slurry of undried chemical broad-leaved of 0～20wt%; Described core paper layer is made up of the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt%; Described facial tissue layer is made up of the fresh slurry of undried chemical broad-leaved of 20～80wt% and the chemical needle slurry of 20～80wt%.
2. flexible package punch base board according to claim 1, is characterized in that, the weight of described ground paper layer is 10～30% of flexible package punch base board weight.
3. flexible package punch base board according to claim 1, is characterized in that, the weight of described core paper layer is 35～55% of flexible package punch base board weight.
4. flexible package punch base board according to claim 1, is characterized in that, the weight of described facial tissue layer is 15～45% of flexible package punch base board weight.
5. flexible package punch base board according to claim 1, is characterized in that, the weight of described coating is 7～16% of flexible package punch base board weight.
6. flexible package punch base board according to claim 1, is characterized in that, described coating comprises precoated shet and finishing coat; Described precoated shet is between facial tissue layer and finishing coat.
7. flexible package punch base board according to claim 6, it is characterized in that, described finishing coat comprise in china clay, talcum powder and the titanium dioxide of calcium carbonate, 30～70 weight portions of 30～70 weight portions one or more, SA styrene-acrylic latex, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion of 13～20 weight portions.
8. flexible package punch base board according to claim 7, is characterized in that, described coating also comprises core coating; Described core coating is between precoated shet and finishing coat.
9. flexible package punch base board according to claim 8, it is characterized in that, described precoated shet and core coating are composed of the following components independently of one another: in the calcium carbonate of 30～70 weight portions, china clay, talcum powder and the titanium dioxide of 30～70 weight portions one or more, 13～20 weight portion SBR carboxylic styrene butadiene latexs, the water repellent agent of 0.2～0.5 weight portion and the lubricant of 0.1～0.5 weight portion.
10. a preparation method for flexible package punch base board, is characterized in that, comprises the following steps:
After the unbleached kraft pulp of 80～100wt% is mixed with the fresh slurry of undried chemical broad-leaved of 0～20wt%, pass into the bottom head box of folded net paper machine;
After the fresh slurry of undried chemical broad-leaved, the unbleached kraft pulp of 50～80wt% and the mechanical pulp of 5～30wt% of 10～20wt% are mixed, pass into the sandwich layer head box of folded net paper machine;
After the fresh slurry of undried chemical broad-leaved of 20～80wt% is mixed with the chemical needle slurry of 20～80wt%, pass into the surface layer head box of folded net paper machine;
Through folded net paper machine three cascade net moulding, obtain thering is ground paper layer, the body paper of core paper layer and facial tissue layer;
After described body paper is dried for the first time, Coating, then after being dried for the second time, obtain flexible package punch base board.
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