CN103042798A - Method for manufacturing laminated packaging material - Google Patents
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- CN103042798A CN103042798A CN2012105946256A CN201210594625A CN103042798A CN 103042798 A CN103042798 A CN 103042798A CN 2012105946256 A CN2012105946256 A CN 2012105946256A CN 201210594625 A CN201210594625 A CN 201210594625A CN 103042798 A CN103042798 A CN 103042798A
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Abstract
The invention provides a method for manufacturing laminated packaging material. The method for manufacturing the laminated packaging material comprises the following steps: step 1, pressing crease lines and stamping open holes in a core layer; step 2, extruding laminated thermoplastic material on the outer side surface of the core layer to form an outermost layer; step 3, extruding laminated thermoplastic material on the inner side surface of the core layer to form an intermediate layer and combining a blocking layer with the inner side surface of the core layer through the intermediate layer at the same time; step 4, extruding laminated thermoplastic material on the blocking layer to form an adhesive layer; and step 5, extruding laminated thermoplastic material on the adhesive layer to form the innermost layer. In the step 5, the thermoplastic material of the innermost layer is formed by the blending metallocene catalyst polymerized linear low density polyethylene (MLLDPE) and low density polyethylene (LDPE). According to the invention, during the process of manufacturing a packaging container by the laminated packaging material manufactured by using the method, heat seal can be quickly performed on the longitudinal sealing part, so as to obtain the packaging container with good sealing strength, the manufactured packaging container has a high qualification rate, and the liquid food can be preserved for a long time.
Description
Technical field
The present invention relates to a kind of method of making laminate wrapping material, relate in particular to the method that a kind of manufacturing is used for the packaging material of packaging liquid food.
Background technology
At present, the disposable disposal type packing container that is used for liquid food, brick is arranged, square, triangle, cross section is hexagonal octahedral bodily form, the shapes such as pillow-like, usually the laminate wrapping material of making these packing containers comprises the successively thermoplastic outermost layer of lamination, sandwich layer, the thermoplastic intermediate layer, the barrier layer, adhesive phase and thermoplastic innermost layer also have the low density polyethylene (LDPE) (LDPE) that adopts high-pressure process to produce/printer's ink layer/paper (fiber) base layer/LDPE/ aluminium foil AL/LDPE/LDPE, LDPE/ printer's ink layer/paper base layer/LDPE/LDPE, printer's ink layer/LDPE/ paper base layer/LDPE/LDPE, laminate wrapping material such as LDPE/ printer's ink layer/paper base layer/sandwich constructions such as LDPE/ aluminium/polyester (PET).The food liquid that these packing containers can be packed has fresh milk, yoghurt, fruit juice etc.
Core material commonly used has paper, brown paper or hardboard etc., barrier material commonly used has aluminium foil, metal/inorganic oxide film, ethylene-vinyl alcohol copolymer (EVOH), nylon etc., thermoplastic outermost layer commonly used, the intermediate layer, the low density polyethylene (LDPE) (LDPE) that the useful high-pressure process of the material of innermost layer is produced, LLDPE (LLDPE), by the thermoplastics such as ethyleneα-olefincopolymer (mLLDPE) of metalloscene catalyst catalytic polymerization, adhesive commonly used has polyurethane binder, Polyester Polyurethane Adhesive, the polyether-polyurethane adhesive, acrylic adhesive, polyester binder, polyamide binder, the polyvinyl acetate ester adhesive, epoxy adhesive, rubber adhesive etc.
The effect of each layer of packaging material is: the thermoplastic outermost layer can stop effectively that extraneous moisture, pollution or other magazines enter in the packaging material; Sandwich layer can the supporting package container; Thermoplastic intermediate layer and barrier layer can prevent effectively that food liquid from entering into sandwich layer, and starvation, sunlight make not light leak, air tight of packing container simultaneously, particularly do not leak oxygen, guarantee that the food liquid taste does not run off; The thermoplastic innermost layer directly contacts with food liquid, prevents that food liquid is to the infiltration of other each layers of packaging material when guaranteeing the food liquid quality; Adhesive phase adds the adhesion strength between high containment and the thermoplastic innermost layer.
Fig. 1 shows a kind of common method of making laminate wrapping material, machine guiding core layer coiled material 1 moves ahead by the pressure roller of punching press platform 2, process hole and the required impression of FOLD AND PACK material of the required usefulness of packing container opening device, continue to guide the sandwich layer coiled material 11 of perforate forward, arrive laminating bench 5, extruder 3 squeezes out thermoplastic intermediate layer coiled material and guides it to and reaches laminating bench 5 herein, barrier layer coiled material 4 is directed to laminating bench 5 simultaneously, 5 pairs of three-layer coil materials of laminating bench carry out lamination, in its roll gap center core layer, thermoplastic intermediate layer and barrier layer are pressed together, and the thermoplastic intermediate layer is between sandwich layer and barrier layer, become thus laminate 111. guide layer pressing plates 111 and arrive next stage laminating bench 6, herein by coextruding and coat the opposite side with thermoplastic innermost layer 7 paint laminates 111 barrier layers, in the roll gap of laminating bench 6, laminate 111 and thermoplastic innermost layer 7 are pressed together, form thus the inboard laminated material 1111 that is coated with the thermoplastic innermost layer, by extrusion coated thermoplastic outermost layer in the i.e. outside coating of sandwich layer opposite side, so far obtain the used laminate wrapping material of packing container afterwards.Certainly, the outermost coating of thermoplastic might not be placed on final step to be carried out, and also can according to circumstances apply in suitable before step.
The packing container of the laminate wrapping material Production and Packaging food liquid that available said method is made.In order to prevent that packaged food liquid from suffering secondary pollution, the production process of whole packing container is all carried out under aseptic condition: first laminate wrapping material is shaped to cylindric, and at the vertical sealing-in formation of side tube, then in the horizontal sealing-in of tube one end, form top or the bottom of packing container, fill afterwards required food liquid, at last the residue of tube is held horizontal sealing-in, make bottom or the top of packing container.By cutting transverse packed zone, can form single independently packing container, and with these independently packing container deliver in the final folding and shaped device and be converted into net shape, such as brick type or other shapes.Laminate wrapping material longitudinal sealing, transverse sealing time in forming the packing container process can have influence on production efficiency, the qualification rate of intensity effect packing container of longitudinal sealing, transverse sealing and guaranteeing the quality the time of food liquid.
Chinese invention patent application prospectus CN1337914A discloses a kind of paper container package material, at least the constituting layer that comprises thermoplastic outermost layer, papery base layer, barrier layer and thermoplastic innermost layer are arranged and with each constituting layer by the said sequence lamination, be characterised in that: the thermoplastic innermost layer comprises the LLDPE with narrow molecular weight distribution at least, has following performance parameter: averag density 0.900-0.915,88-103 ℃ of peak value fusing point, melt flow index 5-20, expansion ratio (SR) 1.4-1.6 and bed thickness 20-50 micron.These packaging material are so that be easy to pouring package packing container and rapid heat-seal, obtain the container of more firm stronger sealing, this material can be used for realizing being independent of in-built food temperature excellent sealing and thereby keep the ability that in-built product never degenerates and guarantees the quality, but, this packaging material are in the extruding layer compression technology of manufacture process, serious necking phenomenon can occur in molten condition during from the die head film extrusion of extruder in the thermoplastic innermost layer, be that the extrusion die dual-side can shrink to the centre, edge thickness is uneven even the phenomenon of breach occurs, the both sides, barrier layer can not be capped or cladding thickness inhomogeneous, in order to prevent that flaw from appearring in the finished product packing material, three kinds of solutions are arranged usually, a kind of is to do the die head of extruder wider than the width on papery base layer and barrier layer, the defective part in extrusion die both sides is not covered on the barrier layer, and cooling forming excises again in follow-up lamination operation; Another kind be with the width on papery base layer and barrier layer do wider, extrude lamination after, the flaw part of excision packaging material both sides obtains qualified packaging material; Moreover reduce necking phenomenon by increase thermoplastic innermost layer thickness and damage.These three kinds of solutions all need extruder die head than wide many of the width on papery base layer and barrier layer, need more heat heating and melting thermoplastic, cause energy waste, and after lamination is finished, also will excise the flaw part of packaging material both sides, cause waste of raw materials.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of making laminate wrapping material, when extruding lamination thermoplastic innermost layer in manufacture process serious necking phenomenon can not occur, can not cause the serious energy and waste of raw materials, and the energy rapid heat-seal obtained the good packing container of sealing intensity when the laminate wrapping material of the method manufacturing was made packing container.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is: a kind of method of making laminate wrapping material comprises the steps:
Step 1 is suppressed crease line and is stamped out open hole at sandwich layer;
Step 2 is extruded the lamination thermoplastic at the sandwich layer lateral surface and is formed outermost layer;
Step 3 is extruded the lamination thermoplastic at the sandwich layer medial surface and is formed the intermediate layer, and the barrier layer is compounded on the sandwich layer medial surface by the intermediate layer simultaneously;
Step 4 is extruded the lamination thermoplastic and is formed adhesive phase on the barrier layer;
Step 5 is extruded the lamination thermoplastic at adhesive phase and is formed innermost layer;
In above-mentioned steps 5, the LLDPE (MLLDPE) of blend metalloscene catalyst polymerization and low density polyethylene (LDPE) (LDPE) form the thermoplastic of described innermost layer, wherein,
The LLDPE of described metalloscene catalyst polymerization (mLLDPE) has following parameter: averag density be 0.88g/cm3～0.925g/cm3, melt flow index (190 ℃, 2.16kg) for 5g/10min～20g/10min, peak value fusing point be that 85 ℃～130 ℃, expansion ratio are 1.2～1.8; Described low density polyethylene (LDPE) (LDPE) has following parameter: averag density is 0.90g/cm
3～0.925g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～110 ℃, expansion ratio are 1.2～1.8.
Among the present invention, melt flow index is measured according to 190 ℃, the condition determination of 2.16kg in the GB/T3682-2000 melt flow index assay method.Expansion ratio be illustrated in GB/T3682-2000 melt flow index assay method under the identical condition determination (namely 190 ℃, 2.16kg), the cross sectional dimensions ratio of the cross sectional dimensions of the extrudate of measured depanning and die orifice.The peak value fusing point is obtained by differential scanning calorimetry, if two or more peak value refers to first peak value.Low density polyethylene (LDPE) (LDPE) can be LLDPE (LLDPE), also can be non-linear low density polyethylene (LDPE), just can satisfy requirement of the present invention as long as have above-mentioned performance parameter.
As a kind of improvement of technique scheme, wherein, the LLDPE of described metalloscene catalyst polymerization (mLLDPE) has following parameter: averag density is 0.90g/cm
3～0.915g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 88 ℃～120 ℃, expansion ratio are 1.4～1.6.
As further improvement in the technical proposal, wherein, the averag density of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 0.905g/cm
3～0.910g/cm
3,, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 93 ℃～103 ℃, expansion ratio are 1.4～1.6.
As further improvement in the technical proposal, wherein, described low density polyethylene (LDPE) (LDPE) has following parameter: averag density is 0.910g/cm
3～0.92g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～110 ℃, expansion ratio are 1.4～1.6.
As further improvement in the technical proposal, wherein, the averag density of described low density polyethylene (LDPE) (LDPE) is 0.915g/cm
3～0.920g/cm
3,, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 93 ℃～103 ℃, expansion ratio are 1.4～1.6.
As further improvement in the technical proposal, wherein, the weight percentage (wt) of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 50%～80%, and the weight percentage (wt) of described low density polyethylene (LDPE) (LDPE) is 20%～50%.
As further improvement in the technical proposal, wherein, the weight percentage (wt) of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 60%～75%, and the weight percentage (wt) of described low density polyethylene (LDPE) (LDPE) is 25%～40%.
As further improvement in the technical proposal, wherein, the weight percentage (wt) of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 70%, and the weight percentage (wt) of described low density polyethylene (LDPE) (LDPE) is 30%.
The present invention compared with prior art, use the thermoplastic innermost layer of the laminate wrapping material of the inventive method manufacturing to adopt LLDPE (MLLDPE) and the low density polyethylene (LDPE) (LDPE) with the polymerization of particular characteristic parameter metalloscene catalyst, in the extruding layer compression technology of manufacture process, the thermoplastic innermost layer has obtained largely reducing in the necking phenomenon of molten condition during from the die head film extrusion of extruder, the energy and waste of raw materials phenomenon have largely inhibition, and the energy rapid heat-seal obtains the good packing container of sealing intensity when using laminate wrapping material of the present invention to make packing container.
Figure of description
Fig. 1 is a kind of schematic diagram of making the laminate wrapping material method.
Fig. 2 is the cross sectional representation of a kind of laminate wrapping material of the present invention.
The specific embodiment
As shown in Figure 2, a kind of laminate wrapping material of the inventive method manufacturing comprises thermoplastic outermost layer 21, sandwich layer 22, thermoplastic intermediate layer 23, barrier layer 24, adhesive phase 25 and thermoplastic innermost layer 26 from outside to inside successively.
Thermoplastic innermost layer 26 comprises LLDPE (MLLDPE) and the low density polyethylene (LDPE) (LDPE) of metalloscene catalyst polymerization, wherein, the LLDPE of metalloscene catalyst polymerization (mLLDPE) has following parameter: averag density is 0.88g/cm
3～0.925g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～130 ℃, expansion ratio are 1.2～1.8; Low density polyethylene (LDPE) (LDPE) has following parameter: averag density is 0.90g/cm
3～0.925g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～110 ℃, expansion ratio are 1.2～1.8, low density polyethylene (LDPE) (LDPE) can be LLDPE, also can be non-LLDPE.The weight percentage (wt) of the LLDPE of metalloscene catalyst polymerization (mLLDPE) is 50%～80%, and the weight percentage (wt) of low density polyethylene (LDPE) (LDPE) is 20%～50%.
Sandwich layer 22 is the coiled material of paper substrates, behind the lateral surface printed patterns, after indentation roller is suppressed crease line and is stamped out open hole, form thermoplastic outermost layer 21 in the outside of sandwich layer 22 by the extruding layer compression technology with low-density polyethylene material, continue to guide the sandwich layer coiled material of impression perforate forward, arrive laminating bench, extruder squeezes out the low-density polyethylene film as thermoplastic intermediate layer 23 herein, aluminum foil coiled material as barrier layer 24 is directed to laminating bench simultaneously, it is compound that laminating bench carries out lamination to trilaminate material, at its roll gap center core layer 22 medial surfaces, thermoplastic intermediate layer 23 and barrier layer 24 are pressed together, then, polyvinyl acetate ester adhesive extruding layer is being pressed onto barrier layer 24 formation adhesive phases 25.
With above-mentioned conventional material with extrude the multilayer material that laminating method makes thermoplastic outermost layer 21/ sandwich layer 22/ thermoplastic intermediate layer 23/ aluminium foil layer, 24/ adhesive phase 25, then LLDPE (mLLDPE) and the low density polyethylene (LDPE) of distinguishing weight percentage (wt) the blend metalloscene catalyst polymerization in the according to the form below 1 obtain blend, respectively take bed thickness as 20,22,25,30 microns blend extruding layer is pressed onto and forms thermoplastic innermost layer 26 on the adhesive phase 25 of this multilayer material, when this blend is extruded the formation film from the extruder die orifice, the film both sides do not form breach, edge thickness is substantially even, dual-side can shrink to the centre very little, these multilayer material both sides are capped even thickness, the laminate wrapping material that obtains is on bottle placer in the pouring in liquid food process, can reliably finish fast the packing container longitudinal sealing, transverse sealing, the qualification rate of the packing container of making is high, and the time of guaranteeing the quality of food liquid is long.
When the LLDPE (mLLDPE) of blend metalloscene catalyst polymerization and low density polyethylene (LDPE) obtain blend, can adopt the particle Direct Uniform with both materials to mix, also can adopt bi-material mixed after again melting stir, carry out granulation again and obtain the blend particle, the mixture homogeneity of rear a kind of mode is a kind of better than front.
Adhesive phase 25 and thermoplastic innermost layer 26 can adopt two-layer co-extrusion mode to be laminated on the aluminium foil on barrier layer 24, can simplify technique like this, and adhesive phase 25 and thermoplastic innermost layer 26 interlayer adhesions are good.
Table 1:
Claims (10)
1. a method of making laminate wrapping material comprises the steps:
Step 1 is suppressed crease line and is stamped out open hole at sandwich layer (22);
Step 2 is extruded the lamination thermoplastic at sandwich layer (22) lateral surface and is formed outermost layer (21);
Step 3 is extruded the lamination thermoplastic at sandwich layer (22) medial surface and is formed intermediate layer (23), and barrier layer (24) are compounded on sandwich layer (22) medial surface by intermediate layer (23) simultaneously;
Step 4, (24) are extruded the lamination thermoplastic and are formed adhesive phase (25) on the barrier layer;
Step 5 is extruded the lamination thermoplastic at adhesive phase (25) and is formed innermost layer (26);
In above-mentioned steps 5, the LLDPE (MLLDPE) of blend metalloscene catalyst polymerization and low density polyethylene (LDPE) (LDPE) form the thermoplastic of innermost layer (26), wherein,
The LLDPE of described metalloscene catalyst polymerization (mLLDPE) has following parameter: averag density is 0.88g/cm
3～0.925g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～130 ℃, expansion ratio are 1.2～1.8;
Described low density polyethylene (LDPE) (LDPE) has following parameter: averag density is 0.90g/cm
3～0.925g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～110 ℃, expansion ratio are 1.2～1.8.
2. a kind of method of making laminate wrapping material according to claim 1, it is characterized in that: the LLDPE of described metalloscene catalyst polymerization (mLLDPE) has following parameter: averag density is 0.90g/cm
3～0.915g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 88 ℃～120 ℃, expansion ratio are 1.4～1.6.
3. a kind of method of making laminate wrapping material according to claim 1, it is characterized in that: the averag density of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 0.905g/cm
3～0.910g/cm
3,, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 93 ℃～103 ℃, expansion ratio are 1.4～1.6.
4. a kind of method of making laminate wrapping material according to claim 1, it is characterized in that: described low density polyethylene (LDPE) (LDPE) has following parameter: averag density is 0.910g/cm
3～0.92g/cm
3, melt flow index (190 ℃, 2.16kg) is that 5g/10min～20g/10min, peak value fusing point are that 85 ℃～110 ℃, expansion ratio are 1.4～1.6.
5. a kind of laminate wrapping material according to claim 1, it is characterized in that: the averag density of described low density polyethylene (LDPE) (LDPE) is 0.915g/cm
3～0.920g/cm
3, melt flow index (190 ℃, 2.16kg) be 5g/10min～20g/10min, peak value fusing point be 93 ℃～103 ℃,, expansion ratio is 1.4～1.6.
6. a kind of method of making laminate wrapping material according to claim 1, it is characterized in that: described low density polyethylene (LDPE) (LDPE) is LLDPE (LLDPE).
7. a kind of method of making laminate wrapping material according to claim 1, it is characterized in that: described low density polyethylene (LDPE) (LDPE) is non-linear low density polyethylene (LDPE).
8. each described a kind of method of making laminate wrapping material in 7 according to claim 1, it is characterized in that: the weight percentage (wt) of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 50%～80%, and the weight percentage (wt) of described low density polyethylene (LDPE) (LDPE) is 20%～50%.
9. each described a kind of method of making laminate wrapping material in 7 according to claim 1, it is characterized in that: the weight percentage (wt) of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 60%～75%, and the weight percentage (wt) of described low density polyethylene (LDPE) (LDPE) is 25%～40%.
10. each described a kind of method of making laminate wrapping material in 7 according to claim 1, it is characterized in that: the weight percentage (wt) of the LLDPE of described metalloscene catalyst polymerization (mLLDPE) is 70%, and the weight percentage (wt) of described low density polyethylene (LDPE) (LDPE) is 30%.
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| CN2012105946256A CN103042798A (en) | 2012-12-31 | 2012-12-31 | Method for manufacturing laminated packaging material |
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| CN2012105946256A CN103042798A (en) | 2012-12-31 | 2012-12-31 | Method for manufacturing laminated packaging material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104309259A (en) * | 2014-10-29 | 2015-01-28 | 彭小玲 | Method for manufacturing sheet-shaped packaging materials |
| CN104999757A (en) * | 2015-08-04 | 2015-10-28 | 厉善君 | Aseptic packaging material and aseptic packaging container for edible liquor |
| US11273617B2 (en) | 2016-10-17 | 2022-03-15 | Sig Technology Ag | Sheetlike composite, in particular for the production of dimensionally stable foodstuff containers, having a first bending resistance which is less than a further bending resistance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337914A (en) * | 1999-01-27 | 2002-02-27 | 泰特拉-勒维尔金融控股公司 | Laminated packaging material for paper container |
| CN1652934A (en) * | 2002-05-07 | 2005-08-10 | 利乐拉瓦尔集团及财务有限公司 | Packaging laminate, method for its manufacturing and packaging container manufactured from the packaging laminate |
-
2012
- 2012-12-31 CN CN2012105946256A patent/CN103042798A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337914A (en) * | 1999-01-27 | 2002-02-27 | 泰特拉-勒维尔金融控股公司 | Laminated packaging material for paper container |
| CN1652934A (en) * | 2002-05-07 | 2005-08-10 | 利乐拉瓦尔集团及财务有限公司 | Packaging laminate, method for its manufacturing and packaging container manufactured from the packaging laminate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104309259A (en) * | 2014-10-29 | 2015-01-28 | 彭小玲 | Method for manufacturing sheet-shaped packaging materials |
| CN104999757A (en) * | 2015-08-04 | 2015-10-28 | 厉善君 | Aseptic packaging material and aseptic packaging container for edible liquor |
| US11273617B2 (en) | 2016-10-17 | 2022-03-15 | Sig Technology Ag | Sheetlike composite, in particular for the production of dimensionally stable foodstuff containers, having a first bending resistance which is less than a further bending resistance |
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