CN101376270A - Method for producing easy-tear type polypropylene packaging film - Google Patents
Method for producing easy-tear type polypropylene packaging film Download PDFInfo
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- CN101376270A CN101376270A CNA2008101960597A CN200810196059A CN101376270A CN 101376270 A CN101376270 A CN 101376270A CN A2008101960597 A CNA2008101960597 A CN A2008101960597A CN 200810196059 A CN200810196059 A CN 200810196059A CN 101376270 A CN101376270 A CN 101376270A
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Abstract
The invention discloses a method for manufacturing an easy-to-tear type polypropylene packaging film. The method comprises the following steps: (1) taking a polypropylene thin film meeting the sanitary requirement as a raw material, stretching in a single direction, and specifically, heating the polypropylene thin film to 100DEG C to 160 DEG C, with the stretching ratio being 1.1 to 5, so as to obtain a film material after the positioning stretching; and (2) conducting the temperature reduction treatment for the film material after the positioning stretching, specifically reducing the temperature of the film material after the positioning stretching to the environmental temperature. A packaging bag manufactured through the invention has the advantages of easy tearing, and smooth tearing part, when the packaging bag is torn in the stretching direction.
Description
Technical field
The invention belongs to the plastics package technical field, be specifically related to a kind of manufacture method of easy-tear type polypropylene packaging film.
Background technology
Traditional polypropylene packing bag adopts the polypropylene screen of omnidirectional stretching to make as hot sealing layer mostly, perhaps adopts biaxial stretch-formed polypropylene screen to make as former material.
The packaging bag of adopting the polypropylene screen of omnidirectional stretching directly to make as hot sealing layer, its shortcoming is to tear weak effect, is difficult to tear out breach according to a certain direction, has let alone in line.
The packaging bag of adopting biaxial stretch-formed polypropylene screen to make as hot sealing layer, its shortcoming are that cost is higher, and be biaxial stretch-formed owing to having adopted in addition, reduced the mechanical performance and the physical property of film material.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of easy-tear type polypropylene packaging film.
Realize the manufacture method of a kind of easy-tear type polypropylene packaging film of the object of the invention, have following steps:
1. being raw material with the polypropylene film that meets hygienic requirements, it being carried out unidirectional orientation stretch, specifically is to stretch after polypropylene film is heated to 100 ℃ to 160 ℃, and draw ratio is 1.1 to 5, obtains the film material behind the orientation stretching;
2. to the processing of lowering the temperature of the film material behind the orientation stretching, specifically be that temperature quenching with the film material behind the orientation stretching is to environment temperature.
In the technique scheme, according to identical draw direction, 1. and 2. secondary or three times of repeating step.
In the technique scheme, 1. and 2. repeating step after secondary or three times, carries out sided corona treatment to the film material that stretches, and makes film material surface tension greater than 38 dyne, be preferably greater than and equal 40 dyne and, thereby obtain the easy-tear type polypropylene packaging film of forming smaller or equal to 42 dyne.
In the technique scheme, above-mentioned steps 1. in, stretch after preferably polypropylene film being heated to 120 ℃ to 150 ℃, stretch after further preferably polypropylene film being heated to 120 ℃ to 140 ℃; Preferably 1.5 to 3 of draw ratio.
In the technique scheme, above-mentioned steps 2. in, preferably with the temperature quenching of the film material behind the orientation stretching to subzero 15 ℃ to 30 ℃ above freezing, further preferably quenching to 5 ℃ to 25 ℃.
In the technique scheme, the thickness of described easy-tear type polypropylene packaging film is 40 μ m to 100 μ m preferably.
Sided corona treatment is that a kind of electric shock is handled, and it makes object surfaces have higher tack.Its principle be utilize the high-frequency high voltage processed frosting corona discharge " high-frequency ac voltage up to 5000-15000V/m2 ", and the generation low temperature plasma, make frosting produce radical reaction and to make polymer send out ox crosslinked. surperficial roughening and increase its to polar solvent wetting recall-these gas ions are by electric shock and penetrate into object surfaces and destroy its molecular structure, and then with processed surface molecular oxidation and polarization, ion electric shock erosion surface, so that the adhesive ability of increment surface.
The good effect that the present invention has:
(1) in the inventive method, step 1. in, be raw material with the polypropylene film that meets hygienic requirements, it is carried out unidirectional orientation stretches, specifically be to stretch after polypropylene film is heated to 100 ℃ to 160 ℃, draw ratio is 1.1 to 5, obtains the film material behind the orientation stretching; Because polypropylene film has been carried out the unidirectional orientation stretching, the orientation of its strand is rearranged from disorder to order according to draw direction, in the direction that does not obtain stretching, its mechanical performance, physical property remain unchanged substantially, obtaining the direction of orientation stretching, bigger variation has taken place in mechanical performance, physical property, and tearing strength reduces significantly, tearing notch is linearly along draw direction, tears easily and advantage that tearing notch is more regular thereby have; In addition, heating parameters wherein and draw ratio all are the preferable parameters that obtains in practice;
Step 2. in, to the processing of lowering the temperature of the film material behind the orientation stretching, specifically be temperature quenching with the film material behind the orientation stretching to indoor environment temperature, this cooling treatment process is the strand arrangement architecture that obtains behind the stable pulling, the strand after preventing to stretch recoils to disordered state; According to the easy-tear type polypropylene packaging film that the inventive method obtains, have and tear easily and advantage that tearing notch is more regular.
(2) in the inventive method, according to identical draw direction, 1. and 2. secondary or three times of repeating step, because one-off drawing is handled and the regularity that is difficult to guarantee the strand rearrangement is handled in cooling, so preferably repetition simple tension and cooling by secondary or three times, obtaining the comparatively regular easy-tear type polypropylene packaging film of strand, guarantee that the easy-tear type polypropylene packaging film that finally obtains has to tear easily and advantage that tearing notch is more regular.
(3) in the inventive method, stretch after preferably polypropylene film being heated to 120 ℃ to 150 ℃, draw ratio is 1.5 to 3, stretch after further preferably polypropylene film being heated to 120 ℃ to 140 ℃, this kind temperature is convenient to macromolecular rearrangement, in addition between polyacrylic softening point and melting point, draw ratio in conjunction with 1.5 to 3 has effectively guaranteed drawing effect.
(4) in the inventive method, preferably with the temperature quenching of the film material behind the orientation stretching to subzero 15 ℃ to above freezing 30 ℃ with the processing of lowering the temperature, further preferably quenching to 5 ℃ to 30 ℃, quenching is to this temperature, the one, comparatively near environment temperature, be convenient to select for use suitable cooling fluid cooling, but after packaging film is cooled to this scope, for the strand arrangement architecture that obtains behind the stable pulling, it is comparatively favourable that the strand after preventing to stretch recoils to disordered state.
(5) in the inventive method, the film material that stretches is carried out sided corona treatment, make film material surface tension greater than 38 dyne, preferably surface tension is more than or equal to 40 dyne and smaller or equal to 42 dyne, thereby guarantee that film material surface has good surface properties, makes it have adhesion preferably with other film material compound tense.
The specific embodiment
(embodiment 1)
Present embodiment is a kind of manufacture method of easy-tear type polypropylene packaging film, has following steps:
1. one-off drawing: with the polypropylene film that meets hygienic requirements is raw material, it is carried out unidirectional orientation stretches, specifically be with polypropylene film through being connected with the warm-up mill surface of deep fat, stretch after being heated to 130 ± 3 ℃, draw ratio is 3, obtains the film material behind the orientation stretching;
2. once cooling: to processings of lowering the temperature of the film material behind the orientation stretching, specifically be to make the film material behind the orientation stretching pass through the chill roll surface that is connected with running water, make its temperature quenching to 25 ± 3 ℃.
The film material that obtains after the processing of once lowering the temperature is detected, its thickness is 70 μ m, and the elongation at break on the draw direction is 125%, and the elongation at break on the draw direction is not 480%, pull-off force on the draw direction is 16N/15mm, and the pull-off force on the draw direction is not 16N/15mm yet.Concrete parameter in the present embodiment is referring to table 1.
(embodiment 2 to embodiment 6)
Embodiment 2 to embodiment 6 is substantially the same manner as Example 1, difference is: each embodiment among the embodiment 2 to embodiment 6, the easy-tear type polypropylene packaging film that obtains is at last detected, its various performance parameters is: the temperature of polypropylene film heating is different, draw ratio is also slightly different, in addition, the temperature of its quenching is also different, and concrete parameter is referring to table 1.
Table 1
The polypropylene packaging film that the foregoing description 1 to embodiment 6 obtains is at last torn test, and its tearing notch is linearly along draw direction basically, is a kind of easy-tear type polypropylene packaging film.
(embodiment 7)
Present embodiment is a kind of manufacture method of easy-tear type polypropylene packaging film, has following steps:
1. one-off drawing: with the polypropylene film that meets hygienic requirements is raw material, it is carried out unidirectional orientation stretches, specifically be with polypropylene film through being connected with the warm-up mill surface of deep fat, stretch after being heated to 130 ± 3 ℃, draw ratio is 3, obtains the film material behind the orientation stretching;
2. once cooling: to processings of lowering the temperature of the film material behind the orientation stretching, specifically be to make the film material behind the orientation stretching pass through the chill roll surface that is connected with running water, make its temperature quenching to 25 ± 3 ℃.
3. succeeding stretch: it is carried out unidirectional orientation stretches, specifically be with polypropylene film through being connected with the warm-up mill surface of deep fat, stretch after being heated to 130 ± 3 ℃, draw ratio is 3, obtains the film material behind the orientation stretching;
4. reducing temperature twice: to the processing of lowering the temperature of the film material behind the orientation stretching, specifically be to make film material behind the orientation stretching, make its temperature quenching to 26 ± 3 ℃ through being connected with the chill roll surface of running water.
5. stretch for three times: it is carried out unidirectional orientation stretches, it is carried out unidirectional orientation stretch, specifically be with polypropylene film through being connected with the warm-up mill surface of deep fat, stretch after being heated to 130 ± 3 ℃, draw ratio is 3, obtains the film material behind the orientation stretching;
6. three coolings: to processings of lowering the temperature of the film material behind the orientation stretching, specifically be to make the film material behind the orientation stretching pass through the chill roll surface that is connected with running water, make its temperature quenching to 27 ± 3 ℃.
7. sided corona treatment: the film material that stretches is carried out sided corona treatment, make film material surface tension reach 39 dyne, thereby obtain the easy-tear type polypropylene packaging film of forming.
The easy-tear type polypropylene packaging film that obtains after the sided corona treatment is detected, its thickness is 70 μ m, elongation at break on the draw direction is 30%, the elongation at break on the draw direction is not 490%, pull-off force on the draw direction is 15N/15mm, and the pull-off force on the draw direction is not 15N/15mm yet.Concrete parameter in the present embodiment is referring to table 2.
(embodiment 8 to embodiment 12)
Embodiment 8 to embodiment 12 is substantially the same manner as Example 1, difference is: each embodiment among the embodiment 8 to embodiment 12, with the temperature of polypropylene film heating, draw ratio, the temperature of quenching and sided corona treatment result are all different, and concrete parameter is referring to table 2.
Table 2
The polypropylene packaging film that the foregoing description 7 to embodiment 12 obtains is at last torn test, and its tearing notch is straight line along draw direction, is a kind of easy-tear type polypropylene packaging film.
Obviously, the above embodiment of the present invention only is for example of the present invention clearly is described, and is not to be qualification to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And these belong to conspicuous variation or the change that connotation of the present invention extends out and still belong to protection scope of the present invention.
Claims (10)
1, a kind of manufacture method of easy-tear type polypropylene packaging film has following steps:
1. being raw material with the polypropylene film that meets hygienic requirements, it being carried out unidirectional orientation stretch, specifically is to stretch after polypropylene film is heated to 100 ℃ to 160 ℃, and draw ratio is 1.1 to 5, obtains the film material behind the orientation stretching;
2. to the processing of lowering the temperature of the film material behind the orientation stretching, specifically be that temperature quenching with the film material behind the orientation stretching is to environment temperature.
2, the manufacture method of easy-tear type polypropylene packaging film according to claim 1 is characterized in that: according to identical draw direction, and 1. and 2. secondary or three times of repeating step.
3, the manufacture method of easy-tear type polypropylene packaging film according to claim 2,1. and 2. it is characterized in that: repeating step is after secondary or three times, the film material that stretches is carried out sided corona treatment, make film material surface tension greater than 38 dyne, thereby obtain the easy-tear type polypropylene packaging film of forming.
4, the manufacture method of easy-tear type polypropylene packaging film according to claim 3 is characterized in that: the film material that stretches is carried out sided corona treatment, make film material surface tension more than or equal to 40 dyne and smaller or equal to 42 dyne.
5, according to the manufacture method of the described easy-tear type polypropylene packaging film of one of claim 1 to 4, it is characterized in that: above-mentioned steps 1. in, stretch after polypropylene film is heated to 120 ℃ to 150 ℃, draw ratio is 1.5 to 3.
6, the manufacture method of easy-tear type polypropylene packaging film according to claim 5 is characterized in that: above-mentioned steps 1. in, stretch after polypropylene film is heated to 120 ℃ to 140 ℃.
7, according to the manufacture method of the described easy-tear type polypropylene packaging film of one of claim 1 to 4, it is characterized in that: above-mentioned steps 2. in, with the temperature quenching of the film material behind the orientation stretching to subzero 15 ℃ to 30 ℃ above freezing.
8, the manufacture method of easy-tear type polypropylene packaging film according to claim 7 is characterized in that: above-mentioned steps 2. in, with the temperature quenching to 5 of the film material behind the orientation stretching ℃ to 25 ℃.
9, the manufacture method of easy-tear type polypropylene packaging film according to claim 1 is characterized in that: the thickness of described easy-tear type polypropylene packaging film is 40 μ m to 100 μ m; The elongation at break of described easy-tear type polypropylene packaging film on draw direction be smaller or equal to 200%, and the elongation at break on draw direction not is more than or equal to 400%.
10, the manufacture method of easy-tear type polypropylene packaging film according to claim 9 is characterized in that: the elongation at break of described easy-tear type polypropylene packaging film on draw direction is smaller or equal to 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810196059.7A CN101376270B (en) | 2008-09-12 | 2008-09-12 | A kind of manufacture method of easy-tear type polypropylene packaging film |
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| CN200810196059.7A CN101376270B (en) | 2008-09-12 | 2008-09-12 | A kind of manufacture method of easy-tear type polypropylene packaging film |
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| CN101376270A true CN101376270A (en) | 2009-03-04 |
| CN101376270B CN101376270B (en) | 2016-04-20 |
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Owner name: ZHEJIANG GOLDSTONE PACKAGE CO., LTD. Free format text: FORMER OWNER: SUN GUOJIN Effective date: 20090410 |
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Effective date of registration: 20090410 Address after: Zhejiang Province, Wenzhou City, Yueqing Province North white elephant town Baita Wang Industrial Zone, zip code: 325600 Applicant after: Zhejiang Goldstone Packing Co., Ltd. Address before: Postal code 53, elephant Tower South, North elephant Town, Zhejiang, Yueqing: 325600 Applicant before: Sun Guojin |
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