CN1297386C - Method for producing two-way stretching polypropylene film for cigarette by pipe soaking method - Google Patents
Method for producing two-way stretching polypropylene film for cigarette by pipe soaking method Download PDFInfo
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- CN1297386C CN1297386C CNB031024556A CN03102455A CN1297386C CN 1297386 C CN1297386 C CN 1297386C CN B031024556 A CNB031024556 A CN B031024556A CN 03102455 A CN03102455 A CN 03102455A CN 1297386 C CN1297386 C CN 1297386C
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- oriented polypropylene
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- -1 polypropylene Polymers 0.000 title abstract description 10
- 239000004743 Polypropylene Substances 0.000 title abstract description 9
- 229920001155 polypropylene Polymers 0.000 title abstract description 9
- 238000002791 soaking Methods 0.000 title abstract 2
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 238000010791 quenching Methods 0.000 claims abstract description 4
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 29
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 22
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 19
- 208000006735 Periostitis Diseases 0.000 claims description 18
- 210000003460 periosteum Anatomy 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 239000011265 semifinished product Substances 0.000 claims description 2
- 238000004513 sizing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 12
- 239000011347 resin Substances 0.000 abstract description 10
- 229920005989 resin Polymers 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 7
- 230000000171 quenching effect Effects 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 27
- 239000000047 product Substances 0.000 description 21
- 230000002457 bidirectional effect Effects 0.000 description 5
- 238000003556 assay Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004596 additive masterbatch Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229920006300 shrink film Polymers 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention discloses a method for producing two-way stretching polypropylene films for cigarettes by a pipe soaking method, which comprises the following working procedures: polypropylene resin and functional mother material are mixed according to a specific proportion; a primary pipe film is extruded on an extrusion machine by a coextrusion mould head for quenching the primary pipe film; then, the primary pipe film is preheated in a preheating baking oven with the temperature of 260 DEG C to 400 DEG C; transverse blowing inflation and longitudinal stretch are carried out in the baking oven with the temperature of 510 DEG C to 300 DEG C; the stretching temperature is from 135 DEG C to 150 DEG C; the primary pipe film has the longitudinal stretching time of 6.5 to 8.0 and the transverse stretching time of 5.0 to 8.0; a bubble film is cooled with a vane, coiled, cut, coiled again and cut again. Compared with the existing film producing technique for two-way stretching polypropylene cigarettes by a horizontal drawing method, the producing technology of the present invention has the advantages of small apparatus occupation area and little investment; a product has high heat contractility and satisfies a film requirement for cigarettes.
Description
Technical field
The present invention relates to a kind of bubble pipe method of utilizing and produce the method for Biaxially oriented polypropylene cigarette with film.
Background technology
The Biaxially oriented polypropylene that containers of cigarettes is used is packed thin always adopt " horizontal sheet process's biaxial tension technology " and is produced, and promptly makes film by the stretching on the both direction in length and breadth, and this production technology equipment investment is big, and floor space is wide.
" bubble pipe method " production technology is called " periosteum method " again, be used to the production of polyethylene kind heat shrink films, its technological process comprises the steps: that raw material mixes, extrudes just periosteum in circular co-extrusion die head, first periosteum is carried out quenching make its crystallization, carry out preheating in preheating oven, carry out horizontal inflation and longitudinal stretching, cooling, rolling in drawing oven, cut and promptly obtain finished product by extruder.It is little that this technology has equipment investment, the material therefor modulus is little, flexible big, the advantage that the product shrinkage factor is high, but this technology speed of production is low, and draw ratio is less, the product thickness lack of homogeneity, the film thickness fluctuation is often more than ± 10%, so can't be used to produce Biaxially oriented polypropylene cigarette film at present.
Because it is harsh that cigarette requires with thin film technique, be used to produce cigarette and will solve following technical problem with bidirectional stretching polypropylene film if will steep pipe method production technology: (1) film product thickness fluctuation requires in ± 6%.(2) film should have suitable shrinkage factor.(3) product of rolling does not have wrinkle.(4) product has suitable Young's modulus.
Summary of the invention
The problems referred to above that exist with the production technology of film at existing Biaxially oriented polypropylene cigarette and the characteristics of bubble pipe method production technology, the object of the present invention is to provide a kind of pipe method of steeping to produce the method for Biaxially oriented polypropylene cigarette with film, adopt production method of the present invention to produce the suitable cigarette bidirectional stretching polypropylene film of performance on the less bubble pipe method process equipment of investment, this film uses on cigarette package and can obtain satisfied packing effect.
For the bidirectional stretching polypropylene film that bubble pipe method is produced reaches the requirement of cigarette packaging film, at pp material with poly different, need be to the prescription of raw material, reach manufacturing condition and method is improved.
The Biaxially oriented polypropylene cigarette that bubble pipe method of the present invention is produced comprises following technical process (the related percentage composition of following formula for a product is weight percentage) with film:
(1) being mixed of acrylic resin and functional master batch, wherein raw materials used the and weight content of the top layer A of film is: COPP 90%～100%, antiseized masterbatch 0%～10%; Composition and weight content that sandwich layer B is contained are: HOPP 53%～100%, increase very masterbatch 0%～35%, smooth master batch 0%～7%, antistatic additive 0%～5%; Composition and weight content that top layer C is contained are: COPP 85%～100%, antiseized masterbatch 0%～15%;
The raw material of the top layer A that (2) will be mixed, sandwich layer B and top layer C is delivered to three extruders and is extruded, and becomes periosteum just by triple extrusion die head again, and is sent to baking oven after sizing plug and water quench typing;
(3) periosteum preheating in temperature is 260 ℃～430 ℃ preheating oven just, in being 530 ℃～300 ℃ drawing ovens, temperature carries out horizontal inflation and longitudinal stretching then, the draft temperature of periosteum is 135 ℃～150 ℃, become the film of predetermined thickness, its longitudinal stretching multiple is 6.5～8.0 times, and the cross directional stretch multiple is 5.0～8.0 times;
(4) film is carried out the vane cooling;
(5) be with on stretching drive roll and rolling carry-over pinch rolls that flannelette stretches and rolling;
(6) film after the rolling is cut on cutting machine immediately, the rewinding on rewinding machine of the semi-finished product after cutting is cut and is got product.
The preferable weight content of above-mentioned top layer A is COPP 94%～98%, antiseized masterbatch 2%～6%.
The preferable weight content of above-mentioned sandwich layer B is HOPP 72%～79%, increases and endure masterbatch 18%～25%, smooth master batch 1%～3%, antistatic additive 2%～3%.
The preferable weight content of above-mentioned top layer C is COPP 96%～99%, antiseized masterbatch 1%～4%.
Above-mentioned preheating oven (1 district-4 district) and drawing oven (5 districts-8 district) preferred temperature are: 1 district: 300 ± 20 ℃; 2 districts: 330 ± 20 ℃; 3 districts: 360 ± 20 ℃; 4 districts: 390 ± 20 ℃; 5 districts: 510 ± 20 ℃; 6 districts: 460 ± 20 ℃; 7 districts: 360 ± 20 ℃; 8 districts: 320 ± 20 ℃.
In order to improve the rolling quality, when rolling, can open the rolling niproll.
Smooth for guaranteeing change of lap, the rolling niproll that closes when preparing change of lap is opened the rolling niproll after having changed.
Employing bubble pipe method provided by the invention is produced Biaxially oriented polypropylene cigarette thin-film technique, by to the screening of raw material and to the improvement of drawing process and rolling method, make and to produce satisfactory bidirectional stretching polypropylene film taking up an area of on the bubble pipe method equipment little, that equipment investment is little, not only can satisfy the cigarette requirement of packing, and compare with film with the Biaxially oriented polypropylene cigarette that existing horizontal sheet process produces, has higher heat-shrinkable, make that film and packed article are more fit, when being used for cigarette in packet, obtain better packing effect.So bubble pipe method provided by the invention is produced cigarette and is compared with thin-film technique with traditional horizontal sheet process's Biaxially oriented polypropylene cigarette with the technology of Biaxially oriented polypropylene cigarette film, have the advantages that floor space is little, equipment investment is little, and product has higher heat-shrinkable, all in claimed range, product does not have wrinkle for the thickness fluctuation of product, shrinkage factor, Young's modulus.
The specific embodiment
Below in conjunction with specific embodiment bubble pipe method Biaxially oriented polypropylene cigarette of the present invention is described further with film production process.
Embodiment 1
Raw material in this example is, top layer A is a COPP, and shared percentage composition is 90%, antiseized masterbatch, and shared percentage composition is 10%; Sandwich layer HOPP content is 55%, increase very that the shared percentage composition of masterbatch is 35%, smooth/shared percentage composition of antistatic additive masterbatch is respectively 5%; Top layer C material therefor and content are identical with top layer A.
Pp material and masterbatch pressed drop into mixing tank after the proportion speed weighing and mixed 15 minutes, deliver to storage tank then, deliver to extruder respectively through pipeline and be extruded into periosteum just through triple extrusion die head, used extruder is respectively: the A layer is φ 50 extruders, and screw slenderness ratio is 30: 1; The B layer is φ 100 extruders, and screw slenderness ratio is 30: 1; The C layer is φ 50 extruders, and screw slenderness ratio is 30: 1; It is 180 ℃～200 ℃ that extrusion temperature is respectively A floor extruder 1 district to 6 district temperature, 190 ℃ of resin melt temperatures; B floor extruder 1 district to 9 district temperature is 210 ℃～240 ℃, 230 ℃ of resin melt temperatures, and C floor extruder 1 district to 6 district temperature is 180 ℃～200 ℃, 190 ℃ of resin melt temperatures.Periosteum preheating in the baking oven preheating zone just, wherein 1 district to 4 district temperature is respectively 300 ℃, 335 ℃, 360 ℃, 390 ℃, stretching at the baking oven drawing zone then, drawing zone is respectively distinguished temperature and is respectively: 500 ℃, 460 ℃, 360 ℃, 300 ℃, the draft temperature of periosteum is 138 ℃, the longitudinal stretching multiple is 7.5 times, and the cross directional stretch multiple is 6.5 times; Vacuolar membrane is carried out vane cooling, and fixedly the vane cooling water temperature is reduced to below 18 ℃, carries out rolling then, through cutting, cut once more after the rewinding finished product, product is tested.
The Biaxially oriented polypropylene cigarette of gained with the product quality of film is
| Sequence number | Interventions Requested unit | Unit | Assay | ||
| 1 | Thickness | Mean value | μm | 21.9 | |
| Maximum | μm | 22.6 | |||
| Minimum of a value | μm | 21.0 | |||
| 2 | Hot strength | Vertically | MPa | 223 | |
| Laterally | MPa | 187 | |||
| 3 | Elongation at break | Vertically | ％ | 100 | |
| Laterally | ％ | 106 | |||
| 4 | Percent thermal shrinkage | Vertically | ％ | 5.77 | |
| Laterally | ％ | 11.60 | |||
| 5 | Coefficient of friction (quiet/moving) | In/in | 0.15/0.12 | ||
| Outward/outer | 0.14/0.12 | ||||
| 6 | Mist degree | ％ | 1.5 | ||
| 7 | Glossiness | ％ | 90.4 | ||
| 8 | Young's modulus | Vertically | N/mm2 | 3057 | |
| Laterally | 3187 | ||||
| 9 | Heat seal strength | N/15mm | 2.61 | ||
| 10 | The electrostatic attenuation rate | In | ％ | 2.74(15.82mv) | |
| Outward | ％ | 2.48(15.84mv) | |||
Embodiment 2
Raw material in this example is, top layer A COPP content is 95%, antiseized masterbatch percentage composition is 5%; HOPP content is 78%, increases very that the masterbatch percentage composition is 18%, the smooth master batch percentage composition is 4% among the sandwich layer B; The COPP percentage composition is 85% among the C of top layer, antiseized masterbatch percentage composition is 15%.
Pp material and masterbatch pressed drop into mixing tank after the proportion speed weighing and mixed 15 minutes, deliver to storage tank then, deliver to extruder respectively through pipeline and be extruded into periosteum just through triple extrusion die head, used extruder is respectively: the A layer is φ 50 extruders, and screw slenderness ratio is 30: 1; The B layer is φ 100 extruders, and screw slenderness ratio is 30: 1; The C layer is φ 50 extruders, screw slenderness ratio be 30: 1 extrusion temperatures to be respectively A floor extruder 1 district to 6 district temperature be 180 ℃～200 ℃, 190 ℃ of resin melt temperatures; B floor extruder 1 district to 9 district temperature is 210 ℃～240 ℃, 230 ℃ of resin melt temperatures, and C floor extruder 1 district to 6 district temperature is 180 ℃～200 ℃, 190 ℃ of resin melt temperatures.Just periosteum is respectively distinguished temperature and is respectively under 290 ℃, 310 ℃, 350 ℃, the 380 ℃ conditions after the preheating and is respectively 510 ℃, 445 ℃, 380 ℃, 310 ℃ baking oven drawing zone in 5 to 8 district's temperature and stretches in the baking oven preheating zone, the draft temperature of periosteum is 146 ℃, the longitudinal stretching multiple is 6.9 times, and the cross directional stretch multiple is 5.5 times; Vacuolar membrane is carried out vane cooling, and fixedly the vane cooling water temperature is reduced to below 18 ℃, carries out rolling then, through cutting, cut once more after the rewinding finished product, product is tested.
The Biaxially oriented polypropylene cigarette of gained with the product quality of film is
| Sequence number | Interventions Requested unit | Unit | Assay | |
| 1 | Thickness | Mean value | μm | 22.2 |
| Maximum | μm | 23.2 | ||
| Minimum of a value | μm | 21.3 | ||
| 2 | Hot strength | Vertically | MPa | 242 |
| Laterally | MPa | 223 | ||
| 3 | Elongation at break | Vertically | ％ | 91 |
| Laterally | ％ | 107 | ||
| 4 | Percent thermal shrinkage | Vertically | ％ | 8.88 |
| Laterally | ％ | 14.26 | ||
| 5 | Coefficient of friction (quiet/moving) | In/in | 0.23/0.20 | |
| Outward/outer | 0.23/0.19 | |||
| 6 | Mist degree | ％ | 1.6 | |
| 7 | Glossiness | ％ | 89.3 | |
| 8 | Young's modulus | Vertically | N/mm 2 | 3325 |
| Laterally | 3345 | |||
| 9 | Heat seal strength | N/15mm | 2.16 | |
| 10 | The electrostatic attenuation rate | In | ％ | 2.22 |
| Outward | ％ | 1.78 | ||
Embodiment 3
Raw material in this example is that the COPP content of top layer A is 100%; The shared weight percentage of HOPP is 95% among the sandwich layer B, and increasing very, the shared weight percentage of masterbatch is 5%; The shared weight percentage of COPP is 99% among the C of top layer, and the shared weight percentage of antiseized masterbatch is 1%.
Pp material and masterbatch pressed drop into mixing tank after the proportion speed weighing and mixed 15 minutes, deliver to storage tank then, deliver to extruder respectively through pipeline and become by periosteum through triple extrusion die head, used extruder is respectively: the A layer is φ 50 extruders, and screw slenderness ratio is 30: 1; The B layer is φ 100 extruders, and screw slenderness ratio is 30: 1; The C layer is φ 50 extruders, and screw slenderness ratio is 30: 1; It is 180 ℃～200 ℃ that extrusion temperature is respectively A floor extruder 1 district to 6 district temperature, 190 ℃ of resin melt temperatures; B floor extruder 1 district to 9 district temperature is 210 ℃～240 ℃, 230 ℃ of resin melt temperatures, and C floor extruder 1 district to 6 district temperature is 180 ℃～200 ℃, 190 ℃ of resin melt temperatures.Just periosteum temperature in the baking oven preheating zone is stretching at the baking oven drawing zone respectively after the preheating under 320 ℃, 350 ℃, 380 ℃, the 410 ℃ conditions, the drawing zone temperature is followed successively by 530 ℃, 475 ℃, 340 ℃, 335 ℃, the draft temperature of periosteum is 149 ℃, the longitudinal stretching multiple is 8.0 times, and the cross directional stretch multiple is 8.0 times; Vacuolar membrane is carried out vane cooling, and fixedly the vane cooling water temperature is reduced to below 18 ℃, carries out rolling then, through cutting, cut once more after the rewinding finished product, product is tested.
The Biaxially oriented polypropylene cigarette of gained with the product quality of film is
| Sequence number | Interventions Requested unit | Unit | Assay | ||
| 1 | Thickness | Mean value | μm | 22.3 | |
| Maximum | μm | 23.4 | |||
| Minimum of a value | μm | 21.6 | |||
| 2 | Hot strength | Vertically | MPa | 227 | |
| Laterally | MPa | 221 | |||
| 3 | Elongation at break | Vertically | ％ | 100 | |
| Laterally | ％ | 111 | |||
| 4 | Percent thermal shrinkage | Vertically | ％ | 5.65 | |
| Laterally | ％ | 12.75 | |||
| 5 | Coefficient of friction (quiet/moving) | In/in | 0.18/0.16 | |
| Outward/outer | 0.18/0.15 | |||
| 6 | Mist degree | ％ | 2.1 | |
| 7 | Glossiness | ％ | 83.9 | |
| 8 | Young's modulus | Vertically | N/mm 2 | 3047 |
| Laterally | 3162 | |||
| 9 | Heat seal strength | N/15mm | 2.80 | |
| 10 | The electrostatic attenuation rate | In | ％ | 1.92 |
| Outward | ％ | 1.41 | ||
By properties of product as can be known, adopt the physical and mechanical properties of the bidirectional stretching polypropylene film that production technology of the present invention produces all can satisfy the requirement of cigarette packaging film.
Claims (7)
1, a kind of pipe method of steeping is produced the method for Biaxially oriented polypropylene cigarette with film, comprises following operation successively:
(1) being mixed of acrylic resin and functional master batch, wherein raw materials used the and weight content of the top layer A of film is: COPP 90%-100%, antiseized masterbatch 0%-10%; Composition and weight content that sandwich layer B is contained are: HOPP 53%-100%, increase very masterbatch 0%-35%, smooth master batch 0%-7%, antistatic additive 0%-5%; Composition and weight content that top layer C is contained are: COPP 85%-100%, antiseized masterbatch 0%-15%;
The raw material of the top layer A that (2) will be mixed, sandwich layer B and top layer C is delivered to three extruders and is extruded, and becomes periosteum just by triple extrusion die head again, and is sent to baking oven after sizing plug and water quench typing;
(3) periosteum preheating in temperature is 260 ℃-430 ℃ preheating oven just, in being 530 ℃ of-300 ℃ of drawing ovens, temperature carries out horizontal inflation and longitudinal stretching then, the draft temperature of periosteum is 135 ℃-150 ℃, make it become the film of predetermined thickness, its longitudinal stretching multiple is 6.5-8.0 times, and the cross directional stretch multiple is 5.0-8.0 times;
(4) film is carried out the vane cooling;
(5) on being with the draw roll of flannelette, drive roll and wind-up roll carry out rolling;
(6) film after the rolling is cut on cutting machine immediately, the rewinding on rewinding machine of the semi-finished product after cutting, cut again.
2, bubble pipe method as claimed in claim 1 is produced the method for Biaxially oriented polypropylene cigarette with film, and it is characterized in that: the weight content of described top layer A is COPP 94%-98%, antiseized masterbatch 2%-6%.
3, bubble pipe method as claimed in claim 1 is produced the method for Biaxially oriented polypropylene cigarette with film, it is characterized in that: the weight content of described sandwich layer B is HOPP 72%-79%, increases and endure masterbatch 18%-25%, smooth master batch 1%-3%, antistatic additive 2%-3%.
4, bubble pipe method as claimed in claim 1 is produced the method for Biaxially oriented polypropylene cigarette with film, and it is characterized in that: the weight content of described top layer C is COPP 96%-99%, antiseized masterbatch 1%-4%.
5, bubble pipe method as claimed in claim 1 is produced the method for Biaxially oriented polypropylene cigarette with film, and it is characterized in that: in operation 3, preheating oven 1 district-4 district's temperature is respectively: 300 ± 20 ℃, 330 ± 20 ℃, 360 ± 20 ℃, 390 ± 20 ℃; Drawing oven 5 districts-8 district's temperature is respectively: 510 ± 20 ℃, 460 ± 20 ℃, 360 ± 20 ℃, 320 ± 20 ℃.
6, bubble pipe method as claimed in claim 1 is produced the method for Biaxially oriented polypropylene cigarette with film, and it is characterized in that: in operation 5, niproll is open during rolling.
7, bubble pipe method as claimed in claim 1 is produced the method for Biaxially oriented polypropylene cigarette with film, it is characterized in that: in operation 5, the niproll that closes earlier during change of lap has changed and has opened the niproll rolling after rolling up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031024556A CN1297386C (en) | 2003-01-27 | 2003-01-27 | Method for producing two-way stretching polypropylene film for cigarette by pipe soaking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031024556A CN1297386C (en) | 2003-01-27 | 2003-01-27 | Method for producing two-way stretching polypropylene film for cigarette by pipe soaking method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1425549A CN1425549A (en) | 2003-06-25 |
| CN1297386C true CN1297386C (en) | 2007-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031024556A Expired - Fee Related CN1297386C (en) | 2003-01-27 | 2003-01-27 | Method for producing two-way stretching polypropylene film for cigarette by pipe soaking method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544416A (en) * | 2010-12-08 | 2012-07-04 | 重庆纽米新材料科技有限责任公司 | Multilayer polyolefin battery diaphragm and preparation method thereof |
| CN103059763B (en) * | 2012-04-27 | 2015-03-25 | 李波 | Bidirectional stretching polypropylene film for hot binding compounding, and its preparation method |
| CN105196668A (en) * | 2015-10-22 | 2015-12-30 | 金田集团（桐城）塑业有限公司 | High-transparency shallow screen printing film and preparation method thereof |
| CN106182835A (en) * | 2016-06-30 | 2016-12-07 | 桐城市华猫软膜有限公司 | A kind of processing method of heat shrink films |
| CN106585013B (en) * | 2016-12-09 | 2018-03-13 | 聚银塑料包装制品（深圳）有限公司 | Polyolefin biaxial tension electrostatic film and preparation method thereof |
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|---|---|---|---|---|
| US4390385A (en) * | 1980-05-23 | 1983-06-28 | W. R. Grace & Co., Cryovac Div. | Heat sealable, multi-ply polypropylene film |
| US4925728A (en) * | 1986-09-13 | 1990-05-15 | Hoechst Aktiengesellschaft | Multilayer film suitable as a release sheet in the production of decorative laminate panels |
| US4963418A (en) * | 1985-07-31 | 1990-10-16 | Toyo Boseki Kabushiki Kaisha | Thermo-shrinkable polyester type film and tube and processing method for preparing the tube |
| US5306559A (en) * | 1992-06-05 | 1994-04-26 | Courtaulds Films (Holdings) Ltd. | Polymeric films |
| CN1259099A (en) * | 1997-06-10 | 2000-07-05 | 美孚石油公司 | Uniaxially shrinkable biaxially oriented polypropylene film and method for use as tobacco pack overwrap |
| CN1329981A (en) * | 2001-05-02 | 2002-01-09 | 海南现代企业股份有限公司 | biaxially oriented polypropylene cigarette shrink film and manufacturing method thereof |
| CN1385295A (en) * | 2002-06-03 | 2002-12-18 | 汕头市江鸿塑胶设备有限公司 | Method and equipment for producing bidirectional stretching plastic film |
-
2003
- 2003-01-27 CN CNB031024556A patent/CN1297386C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4390385A (en) * | 1980-05-23 | 1983-06-28 | W. R. Grace & Co., Cryovac Div. | Heat sealable, multi-ply polypropylene film |
| US4963418A (en) * | 1985-07-31 | 1990-10-16 | Toyo Boseki Kabushiki Kaisha | Thermo-shrinkable polyester type film and tube and processing method for preparing the tube |
| US4925728A (en) * | 1986-09-13 | 1990-05-15 | Hoechst Aktiengesellschaft | Multilayer film suitable as a release sheet in the production of decorative laminate panels |
| US5306559A (en) * | 1992-06-05 | 1994-04-26 | Courtaulds Films (Holdings) Ltd. | Polymeric films |
| CN1259099A (en) * | 1997-06-10 | 2000-07-05 | 美孚石油公司 | Uniaxially shrinkable biaxially oriented polypropylene film and method for use as tobacco pack overwrap |
| CN1329981A (en) * | 2001-05-02 | 2002-01-09 | 海南现代企业股份有限公司 | biaxially oriented polypropylene cigarette shrink film and manufacturing method thereof |
| CN1385295A (en) * | 2002-06-03 | 2002-12-18 | 汕头市江鸿塑胶设备有限公司 | Method and equipment for producing bidirectional stretching plastic film |
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| CN1425549A (en) | 2003-06-25 |
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