CN101733926A - Method and equipment for producing shrinkable film by using stretching device with constant volume conical vessel - Google Patents
Method and equipment for producing shrinkable film by using stretching device with constant volume conical vessel Download PDFInfo
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- CN101733926A CN101733926A CN200810175837A CN200810175837A CN101733926A CN 101733926 A CN101733926 A CN 101733926A CN 200810175837 A CN200810175837 A CN 200810175837A CN 200810175837 A CN200810175837 A CN 200810175837A CN 101733926 A CN101733926 A CN 101733926A
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- constant volume
- conical vessel
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Abstract
The invention discloses a method and equipment for producing a shrinkable film by using a stretching device with a constant volume conical vessel. Linear polyethylene or polypropylene or the mixture thereof are extruded into a thick-pipe film through an extruder; the thick-pipe film enters the stretching device to be heated and then stretched longitudinally and transversely to obtain a second bubble when passing through the constant volume conical vessel of which the temperature is controlled by a built-in electrical heating plate or circulating hot oil; and the second bubble is transversely blown by introducing compressed air when being stretched and obtains a stretched film under the drive of a traction roller. In the method and device, the constant volume conical vessel can support and stabilize the second bubble; different blow-up ratios can be obtained by adjusting a ratio of a diameter of a big end to a diameter of a small end of the constant volume conical vessel so as to produce a polyolefine shrinkable film with different bidirectional shrinkage factors; the shrinkable film obtained by the method can substitute for conventional PE and PVC shrinkable films; the thickness of the shrinkable film is reduced by over 30 percent; and the transparency is also superior to that of the conventional shrinkable films.
Description
Technical field
The present invention relates to a kind of production method that is used to produce the TPO shrinkable film, particularly a kind of method of producing shrinkable film with constant volume type periosteum taper constant volume device stretching device; The invention still further relates in the production process employed with constant volume type periosteum taper constant volume device stretching device.
Background technology
In the production technology of existing disclosed employing periosteum method biaxial tension device (double bubble orientation) extrusion film, stretch near the first thick periosteum that extruder is extruded is heated to fusing point near material, periosteum is to carry out under the state that supports not having during this stretching.Therefore, the thickness of oriented film is generally all below 30 microns, thickness later film because of deadweight can cause can't film forming or the non-constant of the thickness uniformity.In addition, existing stretching device can only be produced and laterally propel the price of than greater than 4 film, for less than 4 the ratio that propels the price of, because envelope is difficult to stablely, causes the excessive or broken bubble of thickness deviation and can't produce during stretching.
Summary of the invention
The objective of the invention is to provide a kind of can regulate the biaxial tension ratio arbitrarily as required, obtains the method and apparatus with constant volume type periosteum taper constant volume device stretching device production shrinkable film of the polyolefin shrink films of different two-way shrinkage factors.
The object of the present invention is achieved like this: a kind of method of producing shrinkable film with constant volume type conical vessel stretching device, linear polyethylene or polypropylene or both mixtures are extruded thick periosteum through extruder, claim first envelope again, thick periosteum enters stretching device under the traction of carry-over pinch rolls, obtained second envelope by the vertical and horizontal stretching when deciding conical vessel through the thick periosteum process after the heating of the thermal treatment zone, the temperature of taper constant volume device is by in-built electrical heating plate or the control of interior logical circulating hot oil, lead to compressed air during stretching in second envelope and envelope is laterally propelled the price of the film of second envelope after obtaining stretching under the traction of carry-over pinch rolls.The temperature of conical vessel is 90-130 ℃.
A kind of constant volume type conical vessel stretching device comprises the thermal treatment zone, and conical vessel is installed in the port of export of the thermal treatment zone, and the cooling water ring is installed in major diameter one end of conical vessel, is provided with carry-over pinch rolls at conical vessel one end.Be provided with electric heating sheets or circulating hot oil device in the taper constant volume device.
Be provided with cooling vane in cooling water ring exit.
The method and apparatus of producing shrinkable film with constant volume type periosteum taper constant volume device stretching device provided by the invention, owing to adopt taper constant volume device, being compressed the film that air propels the price of is limited in the constant volume device, can obtain different blow-up ratios by the outside diameter of regulating taper constant volume device with the ratio of end diameter, thereby produce the polyolefin shrink films of different two-way shrinkage factors.The effect of taper constant volume device is to prevent to steep the unlimited drum of Guan Xiangyi direction greatly until breaking.Because the second bubble pipe and constant volume device inwall are close to,, can only become gradually greatly with the diameter of awl tube and become big, thereby control the thickness evenness of film because the effect of gravity can not along the circumferential direction be moved by the film of inflation.The shrink film that obtains by this method can replace traditional PE and PVC shrink film, and thickness reduces more than 30% than traditional shrink, and transparency also is much better than traditional shrink.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention.
The specific embodiment
As shown in Figure 1, the present invention includes the thermal treatment zone 1, taper constant volume device 2 is installed in the port of export of the thermal treatment zone 1, cooling water ring 3 is installed in major diameter one end of taper constant volume device 2, be provided with cooling vane 4 in cooling water ring 3 exits, being provided with carry-over pinch rolls 6, the second bubble pipes 5 at taper constant volume device 2 one ends is close on the inwall of taper constant volume device 2.Be provided with electric heating sheets or circulating hot oil device in the taper constant volume device 2.
Among the present invention is the conical vessel of a constant volume at conic mandrel bar 2, and its big end is equipped with cooling water ring 3, and cooling water ring 3 is contained on the rotation winder by support.
The effect of taper constant volume device 2 is:
1, control and keep the shape of second envelope and stable, the outside diameter of taper constant volume device is exactly a blow-up ratio with the ratio of end diameter.
2, prevent that second envelope 5 from infinitely rousing greatly until breaking to a direction.
3, because the second bubble pipe 5 is close to constant volume device inwall,, can only becomes gradually greatly with the diameter of awl tube and become big, thereby control the thickness evenness of film because the effect of gravity can not along the circumferential direction be moved by the film of inflation.
The effect of cooling water ring 3 is the rapid cooling shapings of the second bubble pipe film that make through being stretched behind the taper constant volume device.
The effect of cooling vane 4 is to accelerate cooling velocity.
The present invention is applicable to upper blowing method and lower blowing method production film, can use various (LLDPE linear polyethylenes) and PP (polypropylene) to stretch, laterally blow-up ratio is 2-7, longitudinal stretching is than being 3-7, can produce the co-extrusion film of individual layer and multilayer (3 layers, 5 layers), as LLDPE/LLDPE/LLDPE or PP/LLDPE/PP.Wherein each layer can be the blend of single raw material or two or more raw materials, and the film thickness scope that obtains is between the 0.01-0.1 millimeter.
The course of work of the present invention is as follows: linear polyethylene or polypropylene or both mixtures are extruded thick periosteum through extruder, thick periosteum i.e. first envelope, thick periosteum is stretched by vertical and horizontal through taper constant volume device 2 after through the thermal treatment zone 1 heating, the temperature of taper constant volume device 2 is by built-in heating plate or the control of inner loop deep fat, the temperature of taper constant volume device is 80-130 ℃, lead to compressed air during stretching in second envelope and envelope is laterally propelled the price of the film of second envelope 5 after the traction of carry-over pinch rolls 6 obtains stretching.
Claims (5)
1. method of producing shrinkable film with constant volume type conical vessel stretching device, it is characterized in that: linear polyethylene or polypropylene or both mixtures are extruded thick periosteum through extruder, claim first envelope again, thick periosteum enters stretching device under the traction of carry-over pinch rolls, obtained second envelope by the vertical and horizontal stretching when passing through taper constant volume device through the thick periosteum after the heating of the thermal treatment zone, the temperature of taper constant volume device is by built-in electric heating sheets or circulating hot oil control, lead to compressed air during stretching in second envelope and envelope is laterally propelled the price of the film of second envelope after obtaining stretching under the traction of carry-over pinch rolls.
2. method of producing shrinkable film with constant volume type conical vessel stretching device according to claim 1, it is characterized in that: the temperature of taper constant volume device is 80-130 ℃.
3. constant volume type conical vessel stretching device, comprise the thermal treatment zone (1), it is characterized in that: taper constant volume device (2) is installed in the port of export of the thermal treatment zone (1), and cooling water ring (3) is installed in major diameter one end of taper constant volume device (2), is provided with carry-over pinch rolls (6) at conical vessel (2) one ends.
4. constant volume type taper constant volume device stretching device according to claim 3 is characterized in that: be provided with electric heating sheets or circulating hot oil device in the taper constant volume device (2).
5. constant volume type taper constant volume device stretching device according to claim 3 is characterized in that: be provided with cooling vane (4) in cooling water ring (3) exit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810175837A CN101733926A (en) | 2008-11-05 | 2008-11-05 | Method and equipment for producing shrinkable film by using stretching device with constant volume conical vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810175837A CN101733926A (en) | 2008-11-05 | 2008-11-05 | Method and equipment for producing shrinkable film by using stretching device with constant volume conical vessel |
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| CN101733926A true CN101733926A (en) | 2010-06-16 |
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| CN200810175837A Pending CN101733926A (en) | 2008-11-05 | 2008-11-05 | Method and equipment for producing shrinkable film by using stretching device with constant volume conical vessel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102039673A (en) * | 2010-10-18 | 2011-05-04 | 界首市天鸿包装材料有限公司 | Film bubble stabilizer |
| CN106182791A (en) * | 2016-07-08 | 2016-12-07 | 安徽致达包装有限公司 | A kind of POF heat shrink films preparation method for tobacco smoke packaging |
| CN109093997A (en) * | 2018-10-25 | 2018-12-28 | 刘宝龙 | A kind of continous way vertically and horizontally film stretching apparatus |
| CN109774034A (en) * | 2019-02-28 | 2019-05-21 | 黄山至德新材料科技有限公司 | A kind of production technology of POF heat shrink films cooling device and POF heat shrink films |
| CN112873817A (en) * | 2020-12-24 | 2021-06-01 | 重庆瑞霆塑胶有限公司 | Film cooling forming device for film blowing machine |
-
2008
- 2008-11-05 CN CN200810175837A patent/CN101733926A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102039673A (en) * | 2010-10-18 | 2011-05-04 | 界首市天鸿包装材料有限公司 | Film bubble stabilizer |
| CN106182791A (en) * | 2016-07-08 | 2016-12-07 | 安徽致达包装有限公司 | A kind of POF heat shrink films preparation method for tobacco smoke packaging |
| CN109093997A (en) * | 2018-10-25 | 2018-12-28 | 刘宝龙 | A kind of continous way vertically and horizontally film stretching apparatus |
| CN109093997B (en) * | 2018-10-25 | 2021-03-09 | 刘宝龙 | Continuous longitudinal and transverse film stretching equipment |
| CN109774034A (en) * | 2019-02-28 | 2019-05-21 | 黄山至德新材料科技有限公司 | A kind of production technology of POF heat shrink films cooling device and POF heat shrink films |
| CN112873817A (en) * | 2020-12-24 | 2021-06-01 | 重庆瑞霆塑胶有限公司 | Film cooling forming device for film blowing machine |
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Open date: 20100616 |