CN102729560A - Foaming sheet material for packaging - Google Patents
Foaming sheet material for packaging Download PDFInfo
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- CN102729560A CN102729560A CN2012100978890A CN201210097889A CN102729560A CN 102729560 A CN102729560 A CN 102729560A CN 2012100978890 A CN2012100978890 A CN 2012100978890A CN 201210097889 A CN201210097889 A CN 201210097889A CN 102729560 A CN102729560 A CN 102729560A
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Abstract
The invention provides a foaming sheet material for packaging, which has a thickness ranging from 0.3 mm to 5 mm. The foaming sheet material is formed by laminating a resin layer with polyolefin system resin as the basic resin on at least one face of a polyolefin system resin foaming layer through co-extrusion. The foaming sheet material is characterized in that the bending modulus of the polyolefin system resin as the basic resin in the resin layer is below 600MPa. Five to forty weight percent of filling agents with an average particle diameter ranging from 2 mu m to 50 mu m are dispersed in the resin layer. The basis weight of the resin layer is 0.5-10g per m2. The ratio of the average particle diameter (D) (mu m) of the filling agents to the basis weight (B)(g/m2) of the resin layer is 1-12. Therefore, the foaming sheet material which has excellent flexibility, excellent buffering performances seldom damages a body to be packaged and can stably perform packaging. Even when a body to be packaged and having a coating film or a protective film on the surface is maintained in a high-temperature condition for long, the foaming sheet material can effectively prevent the surface of the body from being damaged.
Description
Technical field
The present invention relates to packing and use foam sheet, more in detail, relate to as precision equipment, tame electrical article, electronic component, automobile and use foam sheet with packing of using of the bale packing materials/packaging material of various article such as part.
Background technology
The foamed polyolefin resin sheet material because soft, resiliency is excellent and have water proofing property, moisture resistance, thermal insulation, so useful as the raw material of various padded coamings, packaging material always.
As this foam sheet, for example known have a foamed polyolefin resin sheet material of putting down in writing in TOHKEMY 2005-74771 communique or the japanese kokai publication hei 7-242285 communique.
In recent years; These resin foamed sheets contain conductivity additive or anti-live agent in resin; Be difficult to adhere to dust and have flexibility and resiliency,, be suitable for being utilized as the bale packing materials/packaging material of precision equipment, tame electrical article etc. so be difficult to damage the pack body.
But; Recently; In the surface-protective sheet that has carried out the precision equipment that application is handled, tame electrical article etc., when peeling off this protection sheet material, often produce bad order on the surface of products to be packaged; Particularly wait in outdoor keeping and follow under the situation that temperature rises particularly significantly, report has the situation of the outward appearance of infringement products to be packaged.
This phenomenon is not limited to surface-protective sheet; Even under the situation that above-mentioned existing foamed polyolefin resin sheet material is utilized as packaging material, confirmed to occur unwelcome pattern or spot equally or a part taken place to be coated with film component undesirable surface such as appear in one's mind on the surface bad on the surface of this pack body.
Therefore, the strong request exploitation does not produce this pack surface bad packaging material, bale packing materials, but present situation is the result who is not met as yet.
Summary of the invention
The present invention makes in view of above-mentioned actual conditions; Its problem is to provide a kind of packing to use foam sheet, and its flexibility and resiliency are excellent, is difficult to damage the surface of pack body; And can protect the pack body not to be hit; And, even, also can prevent the surperficial bad of these pack bodies effectively having under the situation of the pack body of coated film or diaphragm etc. for a long time and then on keeping surface under the high-temperature.
Inventors of the present application to solve the above problem and conducted intensive studies, the results found that existing packing bales during the period of package materials, packing materials and the surface of the surface of the package tightly coating film adhesion, continuous surface contact state for a long time, and when the temperature is rising during changes in the external environment, causing the phenomenon of so-called evaporation, coating film on the surface of most of the solvent component release, etc., thereby increasing the solvent concentration in the surface coating film , the coating film surface and penetrated in the package undesirable patterns appear on the surface or spots, or to generate a part of the coating composition rises to the surface and so on.The result who further inquires into obtains following opinion; This phenomenon mainly causes because of the surface contact state of the coated film on the surface of the surface of said bale packing materials and pack body; If can prevent or suppress this surface contact state, then can suppress above-mentioned Evaporation Phenomenon, obtain desirable bundling body.The present invention utilizes above-mentioned opinion and realizes.
That is,, following invention is provided according to the application.
< 1>a kind of packing is used foam sheet, and its thickness is 0.3～5mm, comes out through co-extrusion to be that the resin bed of substrate resin forms with the polyolefin-based resins, to it is characterized in that range upon range of at the single face at least of foamed polyolefin resin layer,
Bending modulus as the polyolefin-based resins of the substrate resin of this resin bed is below the 600MPa, and in this resin bed, cooperating the average grain diameter that is dispersed with 5～40 weight % is the filler of 2～50 μ m, and the basic weight of this resin bed is 0.5～10g/m
2, and the average grain diameter of filler (D) [μ m] is with respect to basic weight (the B) [g/m of this resin bed
2] ratio (D/B) be 1～12.
< 2>use foam sheet like above-mentioned 1 described packing, it is characterized in that, the confficient of static friction of this resin aspect is more than 0.5.
< 3>using foam sheet like above-mentioned 1 or 2 described packings, it is characterized in that, is low density polyethylene (LDPE) as the polyolefin-based resins of the substrate resin of this resin bed.
< 4>use foam sheet like each described packing in above-mentioned 1～3, it is characterized in that the polyolefin-based resins that forms this foaming layer is a low density polyethylene (LDPE).
<5>Use foam sheet like each described packing in above-mentioned 1～4, it is characterized in that, it is 15～90kg/m that this packing is used the apparent density of foam sheet
3
< 6>use foam sheet like each described packing in above-mentioned 1～5, it is characterized in that this filler is a talcum.
< 7>use foam sheet like each described packing in above-mentioned 1～5, it is characterized in that this filler is a calcium carbonate.
Packing of the present invention with foam sheet because flexibility and resiliency are excellent; Therefore be difficult to damage the surface of pack body; Can protect the pack body not to be hit; And, even, also can effectively prevent the surperficial bad of these pack bodies having under the situation of the pack body of coated film or diaphragm etc. for a long time and then on keeping surface under the high-temperature.
Description of drawings
Fig. 1 is the profile of expression packing of the present invention with a structure example of foam sheet;
Fig. 2 is the key diagram of coetrusion.
Symbol description:
1 packing is used foam sheet
2 foamed polyolefin resin layers
3 polyolefin-based resins layers
A first extruder
B second extruder
11 foaming layers form uses resin
12 resin beds form uses resin
13 blowing agent hand-holes
The specific embodiment
The present invention relates to use foam sheet through the co-extrusion range upon range of packing that with the polyolefin-based resins is the resin bed of substrate resin forms of coming out at the single face at least of foamed polyolefin resin layer; It is characterized in that; Its thickness is 0.3～5mm; Bending modulus as the polyolefin-based resins of the substrate resin of this resin bed is below the 600MPa, and the average grain diameter of in this resin bed, disperseing to be combined with 5～40 weight % is the filler of 2～50 μ m, and the basic weight of this resin bed is 0.5～10g/m
2, and the average grain diameter of filler (D) [μ m] is with respect to basic weight (the B) [g/m of this resin bed
2] ratio (D/B) be 1～12.
Below, successively packing of the present invention is described with foam sheet.
With profile the structure example of packing of the present invention with foam sheet is shown among Fig. 1.This packing with foam sheet 1 through constituting at the range upon range of polyolefin-based resins layer 3 that contains filler of the single face at least of foamed polyolefin resin layer 2.At this,, can certainly be formed on the range upon range of structure in two sides according to actual conditions so that range upon range of the example of polyolefin-based resins layer 3 is arranged is that the center is narrated at single face.
Packing of the present invention with foam sheet in, disperse to cooperate the filler of average grain diameter 2～50 μ m of 5～40 weight % at the single face at least of foaming layer, the basic weight of this resin bed is 0.5～10g/m
2, and the average grain diameter of filler (D) [μ m] is with respect to basic weight (the B) [g/m of this resin bed
2] ratio (D/B) be that 1～12 specific resin bed forms through coetrusion, thus, under the most of of filler or the state that all covered, because of the existence of this filler is formed with a plurality of fine concavo-convex at resin layer surface by polyolefin-based resins.
The packing that is made up of existing foamed polyolefin resin sheet material etc. is with himself softness of foam sheet; And its surface is also soft, therefore, is considered to when packing, follow the shape of packed article; And then pack the areal deformation with foam sheet, thereby both become the face state of contact.
Packing of the present invention with foam sheet through be formed with on its surface a plurality of because of filler produce fine concavo-convex; Thus when packing packed article with foam sheet by packing; Packing becomes with foam sheet and packed article puts state of contact in fact; Therefore, think and to suppress above-mentioned the sort of Evaporation Phenomenon, and it is bad to suppress packed article generation surface.
In addition, owing to filler is covered by polyolefin-based resins, so filler can not damage the surface of packed article yet.
Narrate with the polyolefin resin layer 3 of foam sheet 1 constituting packing of the present invention; As the material that constitutes this polyolefin-based resins layer 3; In order not damage the surface of pack body; Need to use bending modulus, be preferably below the 450MPa, more preferably the high resin of flexibility below the 300MPa as below the 600MPa.Its lower limit is roughly about 10MPa.When bending modulus is too high, pack surperficial hardening, and then skid easily, therefore, damage the surface of packed article easily with respect to packed article with foam sheet.As this resin, enumerate polyethylene-based resin, polypropylene-based resin and their two or more mixtures etc.As above-mentioned polyethylene-based resin, enumerate high density polyethylene (HDPE), low density polyethylene (LDPE), straight chain shape low density polyethylene (LDPE), this material and their the two or more mixtures that surpasses 50 moles of % in the copolymer ethene composition of ethene and comonomer of ethylene-vinyl acetate copolymer.In addition, as polypropylene-based resin, enumerate Noblen, propylene-ethylene copolymers, propene-1-butene copolymer, propylene series copolymer and their two or more mixtures such as propylene-ethylene-butene copolymer.In said polyolefins is in the resin, and the viewpoint of the flexibilities such as surface protection excellent performance of and pack body low from case hardness is preferably used polyethylene-based resin, especially preferably used low density polyethylene (LDPE).
Need to prove; The bending modulus of substrate resin is a benchmark with JIS K7171 (1994); Being to use the test film of thickness 2mm * width 25mm * length 40mm, is being the value the condition of 2mm/min under measured for the radius R 2 of 5.0mm, supporting station for 2.0mm, test speed apart from 30mm, pressure head radius R 1 between span.
Basic weight B [the g/m of polyolefin-based resins layer 3
2] be preferably 0.5～10g/m
2, 0.7～5g/m more preferably
2This resin bed as thin as a wafer can through after the coetrusion manufacturing stated.Under the too small situation of the basic weight B of polyolefin-based resins layer 3; Even coetrusion; Make film resin layer itself during fabrication and also become difficulty, on the other hand, when the basic weight B of polyolefin-based resins layer 3 is excessive; Insufficient with purposes possibility light weight, the flexibility of foam sheet 1 because of packing, the expense of raw materials when making packing with foam sheet 1 also improves.
The adjustment of basic weight B forms through adjustment resin bed when the extruding foaming that carries out foam sheet is shaped and carries out with the spray volume of resin melt and the speed of drawing of foam sheet.The basic weight of said polyolefins resin 3 can be obtained through following method.
When making packing with foam sheet 1; The spray volume X of the polyolefin-based resins layer 3 in judging the extruding foaming condition [kg/ hour], the packing that obtains can obtain the basic weight [g/m of polyolefin-based resins layer 3 through following (1) formula with under the width W [m] of foam sheet 1, the situation of packing length L with the time per unit of foam sheet 1 (=pack the speed of drawing with foam sheet) [m/ hour] that obtains
2].
Basic weight [g/m
2]=(1000X/ (L * W)) ... (1)
In polyolefin-based resins layer 3, cooperate filler,, use average grain diameter to be preferably 2～50 μ m, the filler of 3～20 μ m more preferably as this filler.When average grain diameter is too small, be difficult on the surface of resin bed to form fine concavo-convex, thereby be difficult to realize the purpose expected, when average grain diameter was excessive, filler was a large amount of outstanding from the surface of resin bed, possibly damage the surface of packed article.In addition because the absolute number of the filler that exists tails off in the resin bed, so the concavo-convex overstriking on surface, packing with foam sheet with contact above the packed article essence, therefore, can not realize preventing the surperficial bad purpose that this is expected of pack material.
It should be noted that the present invention is based on the average particle diameter is measured by a laser diffraction scattering particle size distribution, relative to the total cumulative volume of the particle volume (cumulative volume) is 50% particle diameter (volume average particle diameter: d50).
The use level of filler is with respect to substrate resin 100 weight portions of polyolefin-based resins layer 3, be preferably 5～40 weight %, more preferably 10～30 weight %, be preferably 15～25 weight % especially.If the use level of filler is very few, then be difficult to the purpose that realizes that the present invention expects, if the use level of filler is too much, then be difficult to make the resin bed elongation during fabrication, make system film resin layer itself become difficult.
As filler, one of can use in inorganic filler or the organic filler.As inorganic filler; Can use the common inorganic particle as filler such as talcum, calcium carbonate, silica, mica, titanium oxide; As organic filler, can use polymeric microspheres such as crosslinked particulate of phenylethylene resin series or the crosslinked particulate of acrylic resin.Wherein, because hardness is low, be difficult to damage the surface of packed article especially, and length-width ratio is also less in the filler of soft, so especially preferably use talcum, calcium carbonate.
In addition, in the present invention, with the average grain diameter (D) [μ m] of filler basic weight (B) [g/m with respect to polyolefin-based resins layer 3
2] ratio (D/B) preferably be made as 1～12, more preferably 2～10, be preferably 3～8 especially.If D/B ratio is too small, then can not form fine concavo-convexly at resin layer surface, be difficult to the purpose that realizes that the present invention expects; If D/B ratio is excessive; Then the absolute number owing to the filler that exists in the resin bed tails off relatively, thus be difficult to realize preventing the purpose that surperficial bad this present invention expected of pack material, and; Because filler is outstanding from resin layer surface easily, therefore also be difficult to realize not damage the purpose that this present invention of surface of packed article is expected.
Secondly, packing of the present invention is narrated with the foamed polyolefin resin layer 2 of foam sheet 1.
Among the present invention,, enumerate polyethylene-based resin, polypropylene-based resin and this two or more mixture etc. as the polyolefin-based resins that is used for foamed polyolefin resin layer 2.As above-mentioned polyethylene-based resin, enumerate high density polyethylene (HDPE), low density polyethylene (LDPE), straight chain shape low density polyethylene (LDPE), this material and these the two or more mixtures that surpasses 50 moles of % in the copolymer ethene composition of ethene and comonomer of ethylene-vinyl acetate copolymer.In addition, as polypropylene-based resin, enumerate propylene series copolymer and these two or more mixtures such as Noblen, propylene-ethylene copolymers, propene-1-butene copolymer, propylene-ethylene-butene copolymer.Said polyolefins is in the resin, considers from the viewpoint of flexibilities such as case hardness is low, preferably uses polyethylene-based resin, especially preferably uses low density polyethylene (LDPE).
Just packing is with regard to the thickness of foam sheet integral body; Resiliency that is not hit with the protection packed article from the superficial injury that prevents the packed article that external factor is brought and the excellent angle of balance between the packing easness, be preferably 0.3～5mm, more preferably 0.5～3mm, be preferably 0.5～2mm especially.
Packing is tried to achieve with the thickness of foam sheet 1 as follows, and every separated 10cm will carry out arithmetic mean at the thickness of each measurement point with measurement thickness such as miniature instrument on packing with the width of foam sheet 1, thereby tries to achieve the thickness of packing with foam sheet 1.
Packing is preferably 15～90kg/m with the apparent density of foam sheet 1
3, 17～60kg/m more preferably
3Under the too small situation of density, possibly stably make just unusual difficulty of good foam sheet such as outward appearance itself, and under excessive situation, according to purposes and maybe resiliency not enough.
Need to prove that this packing is tried to achieve with the apparent density of foam sheet 1 as follows, that is, use and cannot wait packing of trying to achieve to remove through water to survey measured weight of packing in advance with foam sheet 1 with the volume of foam sheet 1, and with unit conversion one-tenth [kg/m
3], try to achieve the apparent density of packing thus with foam sheet 1.
Next, packing of the present invention is narrated with the manufacturing approach of foam sheet 1.Packing of the present invention is for example made through coextrusion foam forming method shown in Figure 2 with foam sheet 1.Particularly; Supplying with foaming layer to the first extruder A forms with polyolefin-based resins 11; Dissolve down mixingly in heating, after this resin melt is pressed into blowing agent, further carrying out mixingly from blowing agent hand-hole 13, process the foaming layer formation that contains blowing agent and use the resin melt.On the other hand, supply with resin bed to the second extruder B and form, dissolve mixingly in heating down, be pressed into as required and further carry out behind the volatility plasticizer mixingly, adjust resin bed formation and uses the resin melt with polyolefin-based resins 12 and filler.In mould, carry out range upon range of with the foaming layer formation of resin melt and the blowing agent that contains the first extruder A with the resin melt this resin bed formation; From being attached to the mould coextrusion of extruder outlet, obtain the single face at least of foamed polyolefin resin layer range upon range of the packing of polyolefin-based resins layer use foam sheet.Through adopting above-mentioned coextrusion foam forming method; The polyolefin-based resins layer of foamed polyolefin resin layer and film excellent in adhesion; Even high filling filler and film as thin as a wafer; Breaking of resin bed etc. can not taken place, can be obtained the resin bed that the surface has the micro concavo-convex that forms because of filler reliably by the state that substrate resin covers with filler yet.
Making the employed blowing agent of foamed polyolefin resin layer of the present invention, for example to enumerate organic system physical blowing agent, nitrogen, carbon dioxide etc. such as chlorinated hydrocabons such as aliphatic hydrocarbons such as propane, normal butane, iso-butane, pentane, isopentane, n-hexane, isohexane, cyclohexane, chloromethanes, chloroethanes inorganic be physical blowing agent.Above-mentioned physical blowing agent can mix two or more uses.
The addition of above-mentioned blowing agent is according to the kind of blowing agent, as the adjustment that suits of the apparent density of the foamed polyolefin resin layer of purpose; For example using under the situation of organic system physical blowing agents such as butane as blowing agent, every substrate resin 100 weight portions of the addition of organic system physical blowing agent are preferably 3～30 weight portions, 4～20 weight portions more preferably.
In addition, when making packing of the present invention,, the foamed polyolefin resin layer adds bladder regulator in forming with resin usually with foam sheet.As bladder regulator, can use any of present normally used inorganic system, organic system.As inorganic be bladder regulator, can enumerate slaine, sodium chloride, aluminium hydroxide, talcum, zeolite, silica, calcium carbonate, sodium acid carbonate of boric acid such as Firebrake ZB, antifungin, borax etc.In addition; As the organic system bladder regulator; Use 2,2-di-2-ethylhexylphosphine oxide (4, the 6-tert-butyl-phenyl) sodium phosphate, Sodium Benzoate, calcium benzoate, aluminum benzoate, odium stearate, other citric acid and sodium acid carbonate, the alkali salt of citric acid and the material that sodium acid carbonate combines.These bladder regulators also can mix two or more uses.
The addition of above-mentioned bladder regulator for example is preferably 0.5～10 weight portion, 1～8 weight portion more preferably with respect to substrate resin 100 weight portions.In addition, bladder regulator preferably uses as masterbatch.
In addition, when making packing of the present invention and use foam sheet, also can add hydrocarbon based compounds such as propane as the volatility plasticizer, normal butane, iso-butane in resin as required in the formation of polyolefin-based resins layer.With regard to these hydrocarbon based compounds; Because resin bed is a film as thin as a wafer; So irrelevant with foaming, can resin bed be formed with the resin plasticizing, resin bed is formed the temperature that is reduced to the foaming that does not hinder foaming layer with the resin temperature of resin; And, under this low resin temperature, also can give the extensibility that resin bed is followed foaming layer.Consequently, though resin bed is difficult to elongation when usually filler is high filling, bubble structure and the system film that can not destroy foaming layer be the resin bed of film as thin as a wafer.Hydrocarbon based compound in the polyolefin-based resins layer is the almost volatilization through the heat in when extruding in extruding, therefore, compares common plasticizers such as the Liquid Paraffin that remains in easily in the resin bed or fatty acid ester, and the rerum naturas such as rigidity of resin bed are reduced.
The addition of volatility plasticizer is according to as the kind of the polyolefin-based resins of the substrate resin of resin bed or the addition of filler, the suitable adjustment such as thickness of resin bed, is about 5 weight portions～50 weight portions with respect to total 100 weight portions of substrate resin and filler.
Packing of the present invention is preferably given anti-charging property with foam sheet 1.Under this situation,, can give fully anti-charging property through anti-live agent is only added in the resin bed.Need to prove, as this anti-live agent, preferred polymer electrolyte anti-live agent.
As the concrete example of above-mentioned polymer electrolyte anti-live agent, enumerate: be selected from one or more the mixture in the quaternary ammonium salts such as ionomers such as polyethylene glycol oxide, PPOX, polyethylene glycol, polyethers, polyesteramide, polyether ester amides, ethylene-methacrylic acid copolymer, polyethylene glycol acrylate based copolymer; Or two or more copolymer; And then in copolymer of other resins such as they and polypropylene etc.; Have polar group in the strand and can make inorganic salts or the organic protic acid salt of low-molecular-weight forms the resin of complex compound or solvation, also can make formation complex compound such as inorganic salts or organic protic acid salt or make its solvation.
The use level of polymer electrolyte anti-live agent is with respect to 100 weight portions of the vinyl copolymer with above-mentioned flexibility, be preferably 5～70 weight portions, more preferably 10～50 weight portions, be preferably 10～40 weight portions especially.
In addition, when making packing of the present invention, can suit to use the employed known various additives of manufacturing foamed polyolefin resin body with foam sheet 1.As this additive, enumerate for example antioxidant, heat stabilizer, weather resisting agent, ultraviolet screener, fire retardant, inorganic filler, anti-shrinking medium, colouring agent etc.
As stated, packing of the present invention,, can stably be packed so be difficult to damage the pack body because flexibility and resiliency are excellent with foam sheet.And, even at high temperature long-term keeping surface has under the situation of pack body of coated film or diaphragm etc., owing to do not connect airtight the contact condition that keeps appropriate with the surface of packed article, so can effectively prevent the surface contamination of these pack bodies.
[embodiment]
Below, more specify packing of the present invention through embodiment and comparative example and use foam sheet.
[embodiment 1]
As first extruder that is used to form the foamed polyolefin resin layer; Use will possess the tandem extruder that the extruder of diameter 90mm extruder and the diameter 120mm of blowing agent inlet links; As second extruder that is used to form the polyolefin-based resins layer, use the extruder of diameter 50mm, L/D=46 (L is diameter as length, D).In addition, at the extruder outlet of first extruder and second extruder, use the annular die of diameter 94mm for the coextrusion of carrying out foam sheet.
For forming the foamed polyolefin resin layer; (bending modulus: 205MPa, MFR (melt turnover)=0.4g/10 minute, Sumitomo Chemical system: trade name " ス ミ カ セ Application F-102 ") 100 weight portions cooperate the bladder regulator masterbatch of 3 weight portions with respect to low density polyethylene (LDPE); Its raw material input port to the extruder of diameter 90mm is supplied with; Add hot milling, process and be modulated to about 200 ℃ melting resin mixture.In this melting resin mixture, use physical blowing agent (the butane mixed foaming agents of normal butane 70 weight % and iso-butane 30 weight %); Being that the mode of 30 weight portions is pressed into respect to low density polyethylene (LDPE) 100 weight portions; Then its extruder to the diameter 120mm in the downstream of the extruder that is linked to above-mentioned diameter 90mm is supplied with, the resin melt is used in the foamed polyolefin resin layer formation that obtains 108 ℃.
On the other hand; For forming the polyolefin-based resins layer; (Sumitomo Chemical system: trade name " ス ミ カ セ Application F-102 ") 100 weight portions cooperate talcum (Ishihara Sangyo Kaisha, Ltd.'s system: trade name " Ha イ Off エ ラ one #12 ": 20 weight portions average grain diameter 6.7 μ m) as filler with respect to low density polyethylene (LDPE); Its raw material input port to second extruder of diameter 50mm is supplied with; Heat and dissolve, process and be modulated to about 200 ℃ melting resin mixture, in this melting resin mixture being that the mode of 30 weight portions is pressed into the mixed butanes (normal butane 70 weight % and iso-butane 30 weight %) as the volatility plasticizer with respect to melting resin mixture 100 weight portions; Then resin temperature is adjusted into 110 ℃, obtains resin bed formation and use the resin melt.
The above-mentioned foaming layer formation that obtains is supplied with in the mould of interflow with the resin melt with resin melt and resin bed formation; Form with resin melt/foaming layer formation with the resin melt/resin bed formation is carried out range upon range of with the mode of resin melt to become resin bed successively; From the annular die coextrusion; Take out the extrusion foaming body of tubular along the cylinder of cooling usefulness, cut, the packing of the present invention that obtains the range upon range of bonding resin bed on the two sides of foaming layer is used foam sheet.
This packing is shown in table 1 and table 2 with bending modulus, the average grain diameter D of filler, basic weight B, average thickness, the D/B of the substrate resin of the apparent density of foam sheet, thickness, resin bed.Need to prove that basic weight B is the basic weight of the resin bed of every single face.In addition, average thickness becomes [μ m] to obtain through basic weight B divided by the density (the loading mean value of the density of polyolefin-based resins and the density of filler) of resin bed and with unit conversion.
[table 1]
" ス ミ カ Application F-102 " is Sumitomo Chemical society system ldpe resin (MFR:0.4g/10 minute);
" ス ミ カ セ-L GA401 " is Sumitomo Chemical society system straight chain shape ldpe resin (MFR:3g/10 minute);
" ノ バ テ Star Network HJ362N " is Japanese polyethylene society system high-density polyethylene resin (MFR:5.0g/10 minute);
" Ha イ Off イ ラ #12 " is Ishihara Sangyo Kaisha, Ltd.'s system talcum;
" ソ Off ト Application 2200 " is shiraishi calcium Co., Ltd. system calcium carbonate;
" ホ ワ イ ト Application SB is blue or green " is shiraishi calcium Co., Ltd. system calcium carbonate;
" BF300 " is shiraishi calcium Co., Ltd. system calcium carbonate.
[table 2]
Need to prove that this packing forms spray volume with the resin melt, reaches to pack with the speed of drawing of foam sheet and carry out through the adjustment resin bed with the adjustment of the basic weight of foam sheet.
Trade name " Ha イ Off イ ラ one #12 "), the bladder regulator masterbatch that forms of the natrium citricum of 5.9 weight portions in addition, bladder regulator uses talcum (Ishihara Sangyo Kaisha, Ltd.'s system: that cooperates 11.8 weight portions with respect to low density polyethylene (LDPE) 100 weight portions.
In addition, with regard to the average grain diameter of filler, using Shimadzu Scisakusho Ltd's system laser diffraction formula particle size distribution measurement device: SALD-2100, is 50% o'clock particle diameter (volume average particle size: d50) be average grain diameter with the accumulative total volume.
[embodiment 2]
Packing among the embodiment 1 is made as 1.02mm with the thickness of foam sheet, the basic weight of resin bed is made as 0.9g/m
2, in addition identical with embodiment 1, use foam sheet thereby obtain packing of the present invention.
This packing with the average grain diameter D of the bending modulus of the substrate resin of the apparent density of foam sheet, thickness, resin bed, filler, basic weight B, average thickness, D/B shown in table 1 and table 2.
[embodiment 3]
Packing among the embodiment 1 is made as 1.08mm with the thickness of foam sheet, replaces talcum and use calcium carbonate (shiraishi calcium Co., Ltd. system: trade name " ホ ワ イ ト Application SB is blue or green " as filler; Average grain diameter 4.7 μ m), the basic weight of resin bed is made as 0.9g/m
2, in addition identical with embodiment 1, use foam sheet thereby obtain packing of the present invention.
This packing with the average grain diameter D of the bending modulus of the substrate resin of the apparent density of foam sheet, thickness, resin bed, filler, basic weight B, average thickness, D/B shown in table 1 and table 2.
[embodiment 4]
Packing among the embodiment 1 is made as 1.08mm with the thickness of foam sheet, forms resin as resin bed and use straight chain shape ldpe resin (Sumitomo Chemical society system: trade name " ス ミ カ セ Application-L GA401 "; Bending modulus 420MPa; MFR:3g/10 minute) and replace talcum and use calcium carbonate (shiraishi calcium Co., Ltd. system: trade name " ホ ワ イ ト Application SB is blue or green " as filler; Average grain diameter 4.7 μ m), the basic weight of resin bed is made as 0.9g/m
2, in addition identical with embodiment 1, use foam sheet thereby obtain packing of the present invention.
This packing is shown in table 1 and table 2 with bending modulus, the average grain diameter D of filler, basic weight B, average thickness, the D/B of the substrate resin of the apparent density of foam sheet, thickness, resin bed.
[embodiment 5]
Packing among the embodiment 1 is made as 2.05mm with the thickness of foam sheet, replaces talcum and use calcium carbonate (shiraishi calcium Co., Ltd. system: trade name " BF300 " as filler; Average grain diameter 21.7 μ m), the basic weight of resin bed is made as 4.5g/m
2, in addition identical with embodiment 1, use foam sheet thereby obtain packing of the present invention.
This packing is shown in table 1 and table 2 with bending modulus, the average grain diameter D of filler, basic weight B, average thickness, the D/B of the substrate resin of the apparent density of foam sheet, thickness, resin bed.
[comparative example 1]
Packing among the embodiment 1 is made as 1.06mm with the thickness of foam sheet, in resin bed, does not add filler, in addition identical with embodiment 1, thus the packing that obtains comparative example is used foam sheet.
This packing is shown in table 1 and table 2 with bending modulus, the average grain diameter D of filler, basic weight B, average thickness, the D/B of the substrate resin of the apparent density of foam sheet, thickness, resin bed.
[comparative example 2]
Packing among the embodiment 1 is made as 1.03mm with the thickness of foam sheet, replaces talcum and use calcium carbonate (shiraishi calcium Co., Ltd. system: trade name " BF300 " as filler; Average grain diameter 21.7 μ m), in addition identical with embodiment 1, thus the packing that obtains comparative example is used foam sheet.
The bending modulus of the substrate resin of the apparent density of this foam sheet, thickness, resin bed, the average grain diameter D of filler, basic weight B, average thickness, D/B are shown in table 1 and table 2.
[comparative example 3]
Packing among the embodiment 1 is made as 2.08mm with the thickness of foam sheet, replaces talcum and use calcium carbonate (shiraishi calcium Co., Ltd. system: trade name " ソ Off ト Application 2200 " as filler; Average grain diameter 2.1 μ m), basic weight is made as 4.5g/m
2, in addition identical with embodiment 1, thus the packing that obtains comparative example is used foam sheet.
This packing is shown in table 1 and table 2 with bending modulus, the average grain diameter D of filler, basic weight B, average thickness, the D/B of the substrate resin of the apparent density of foam sheet, thickness, resin bed.
[comparative example 4]
It is that polyvinyl resin replaces being the polyvinyl resin of bending modulus 820MPa (Japanese polyethylene society system: trade name " ノ バ テ Star HJ362N that resin bed among the embodiment 1 is formed resin; MFR:5.0g/10 minute), in addition identical with embodiment 1, thus the packing that obtains comparative example is used foam sheet.
This packing is shown in table 1 and table 2 with bending modulus, the average grain diameter D of filler, basic weight B, average thickness, the D/B of the substrate resin of the apparent density of foam sheet, thickness, resin bed.
[as the evaluation test of packaging material]
Secondly, use foam sheet, measure its confficient of static friction for the packing of the foregoing description 1～5, comparative example 1～4.In addition, from resiliency, antisitic defect performance and the prima facie viewpoint of packed article, estimated characteristic as its packaging material.Its result is shown in table 2.
Need to prove that evaluation method and metewand are following.
< confficient of static friction >
According to method of tilting in JIS P 8147 regulations; Use the confficient of static friction measuring machine " TYPE:HEIDON-10 " of new eastern science Co., Ltd. system; (200g, 35mm * 70mm) go up the fixing sample of estimating switch to 8mm/ second with the speed change-over switch, the measuring stationary coefficient of friction to the pressure head on the plane.Need to prove that this confficient of static friction is the confficient of static friction on flat corrosion resistant plate (SU S304) surface with respect to surface smoothing.
< resiliency >
In that (size: 100mm * 150mm) goes up the counterweight of hanging 200g, and it is highly fallen from 500mm, adheres to collision injury and estimates the shock-absorbing capacity of packing with foam sheet through having or not by the polypropylene board of estimating the sample packing.
Zero: no collision injury
*: collision injury is arranged
< antisitic defect performance >
In the box abrasion tester of Japan Industrial Co., Ltd of science system, will estimate sample and place polypropylene board (on size: the 50mm * 55mm), and then to apply 10gf/cm
2Load, carry out wear test with the condition of reciprocal width distance 10mm, reciprocal time 100 times, estimate the antisitic defect performance of packing through the surface abrasion status of the polypropylene board after the test with foam sheet.
Zero: do not have scratch
*: scratch is arranged
< packed article superficiality >
To polypropylene board (surface of size: the 65mm * 115mm) propylene of filming successively is that priming paint/propylene is that coating/urethanes is a cleaning agent, 23 ℃ dry 48 hours down.Carry at the application face of polypropylene board after dry at once and comment on the valency sample, apply 24gf/cm above that equably
2Load, in 60 ℃ baking oven, place after 120 hours, remove and estimate sample, clean its surface state of visualization with ethanol with having removed the application face of estimating the polypropylene board of sample.
Zero: it is bad not have the surface
*: spottiness pattern surperficial bad
Claims (7)
1. a packing is used foam sheet, and its thickness is 0.3～5mm, comes out through co-extrusion to be that the resin bed of substrate resin forms with the polyolefin-based resins, to it is characterized in that range upon range of at the single face at least of foamed polyolefin resin layer,
Bending modulus as the polyolefin-based resins of the substrate resin of this resin bed is below the 600MPa, and in this resin bed, cooperating the average grain diameter that is dispersed with 5～40 weight % is the filler of 2～50 μ m, and the basic weight of this resin bed is 0.5～10g/m
2, and the average grain diameter of filler (D) [μ m] is with respect to basic weight (the B) [g/m of this resin bed
2] ratio (D/B) be 1～12.
2. packing as claimed in claim 1 is used foam sheet, it is characterized in that,
The confficient of static friction of this resin aspect is more than 0.5.
3. according to claim 1 or claim 2 packing is used foam sheet, it is characterized in that,
Polyolefin-based resins as the substrate resin of this resin bed is a low density polyethylene (LDPE).
4. use foam sheet like each described packing in the claim 1～3, it is characterized in that,
The polyolefin-based resins that forms this foaming layer is a low density polyethylene (LDPE).
5. use foam sheet like each described packing in the claim 1～4, it is characterized in that,
It is 15～90kg/m that this packing is used the apparent density of foam sheet
3
6. use foam sheet like each described packing in the claim 1～5, it is characterized in that,
This filler is a talcum.
7. use foam sheet like each described packing in the claim 1～5, it is characterized in that,
This filler is a calcium carbonate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011085819A JP5694832B2 (en) | 2011-04-07 | 2011-04-07 | Foam sheet for packaging |
| JP2011-085819 | 2011-04-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102729560A true CN102729560A (en) | 2012-10-17 |
| CN102729560B CN102729560B (en) | 2016-05-18 |
Family
ID=46986186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210097889.0A Active CN102729560B (en) | 2011-04-07 | 2012-04-05 | Packaging foam sheet |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5694832B2 (en) |
| CN (1) | CN102729560B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113518710A (en) * | 2019-03-28 | 2021-10-19 | 积水化成品工业株式会社 | Laminated foam sheet |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3551449B1 (en) * | 2016-12-09 | 2021-05-26 | 3M Innovative Properties Company | Article comprising multilayer film |
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|---|---|---|---|---|
| JPS62216726A (en) * | 1986-03-19 | 1987-09-24 | Mitsubishi Plastics Ind Ltd | Shrinkage packaging film |
| CN1461279A (en) * | 2001-03-14 | 2003-12-10 | 索尼株式会社 | Packaging buffer material |
| CN1986618A (en) * | 2005-12-22 | 2007-06-27 | 株式会社Jsp | Polyethylene resin laminated foam |
| JP2008308695A (en) * | 2002-10-08 | 2008-12-25 | Jsp Corp | Foamed sheet |
| JP2010247529A (en) * | 2009-03-25 | 2010-11-04 | Jsp Corp | Laminated polyethylene resin foamed sheet |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3976574B2 (en) * | 2002-01-29 | 2007-09-19 | 株式会社ジェイエスピー | Polyolefin resin laminated foam sheet and method for producing the same |
| JP2003268147A (en) * | 2002-03-19 | 2003-09-25 | Sekisui Film Kk | Foamed film |
| JP2004284315A (en) * | 2003-03-25 | 2004-10-14 | Toppan Printing Co Ltd | Easily peelable packaging material and easily peelable packaging bag using the packaging material |
| JP4493000B2 (en) * | 2003-08-29 | 2010-06-30 | 株式会社ジェイエスピー | Polyolefin resin foam sheet |
| JP5557309B2 (en) * | 2009-06-25 | 2014-07-23 | 株式会社ジェイエスピー | Polyolefin resin foam sheet |
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2011
- 2011-04-07 JP JP2011085819A patent/JP5694832B2/en active Active
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2012
- 2012-04-05 CN CN201210097889.0A patent/CN102729560B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62216726A (en) * | 1986-03-19 | 1987-09-24 | Mitsubishi Plastics Ind Ltd | Shrinkage packaging film |
| CN1461279A (en) * | 2001-03-14 | 2003-12-10 | 索尼株式会社 | Packaging buffer material |
| JP2008308695A (en) * | 2002-10-08 | 2008-12-25 | Jsp Corp | Foamed sheet |
| CN1986618A (en) * | 2005-12-22 | 2007-06-27 | 株式会社Jsp | Polyethylene resin laminated foam |
| JP2010247529A (en) * | 2009-03-25 | 2010-11-04 | Jsp Corp | Laminated polyethylene resin foamed sheet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113518710A (en) * | 2019-03-28 | 2021-10-19 | 积水化成品工业株式会社 | Laminated foam sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5694832B2 (en) | 2015-04-01 |
| CN102729560B (en) | 2016-05-18 |
| JP2012218279A (en) | 2012-11-12 |
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