CN110901032A - Blown film with increased strength - Google Patents
Blown film with increased strength Download PDFInfo
- Publication number
- CN110901032A CN110901032A CN201911141927.6A CN201911141927A CN110901032A CN 110901032 A CN110901032 A CN 110901032A CN 201911141927 A CN201911141927 A CN 201911141927A CN 110901032 A CN110901032 A CN 110901032A
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- China
- Prior art keywords
- film
- tubular film
- strength
- trend
- half surface
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a blow molding film with increased strength, which is formed by folding and flattening a blow molding extruded tubular film and then hot-pressing the film; the method is characterized in that: before the tubular film is folded and flattened, the linear trend of the advancing direction of the tubular film is changed into a spiral trend, and the spiral trend of the front half surface and the spiral trend of the rear half surface of the tubular film form a crossed net structure during hot pressing. According to the blown film with the strength increased, after the tubular film extruded by the blow molding die head is rotated, the tubular film generates a spiral trend in the advancing process, and then the front half surface and the rear half surface of the tubular film are subjected to hot pressing to form a cross-woven net-shaped structure, so that the longitudinal strength and the transverse strength of the co-extruded film formed by blow molding can be greatly improved without increasing the material thickness or changing the material type; the strength of the blown film of the invention in the longitudinal and transverse directions can reach 2-10 times of the strength of the film formed by the common plastic blowing process.
Description
Technical Field
The invention relates to the field of blown films, in particular to a blown film with increased strength.
Background
The blow molding multi-layer co-extruded film is widely applied to the packaging industry, the chemical industry, the automobile industry, the medical industry, agriculture and the like due to the various combinability and the superiority of cost performance, however, the longitudinal and transverse strength of the blow molding co-extruded film product is always much lower than that of film products of other processes, when the film product needs higher strength and toughness, the currently common adoption means is to directly increase the thickness of the film or use a material with higher strength for replacement, and the material with higher strength is also more expensive.
Disclosure of Invention
In order to solve the technical problems, the invention provides a blown film with increased strength, wherein after a tubular film extruded by a blow molding die head rotates, the tubular film generates a spiral trend in the advancing process, and then the front half surface and the rear half surface of the tubular film are subjected to hot pressing to form an interwoven net-shaped structure, so that the material is not increased or changed, and the longitudinal and transverse strength of the blown co-extruded film is greatly increased.
The technical scheme adopted by the invention for solving the technical problems is as follows: a blow molding film with increased strength is formed by hot pressing a blow molding extruded tubular film after being folded flat; the method is characterized in that: before the tubular film is folded and flattened, the linear trend of the advancing direction of the tubular film is changed into a spiral trend, and the spiral trend of the front half surface and the spiral trend of the rear half surface of the tubular film form a crossed net structure during hot pressing.
Furthermore, the included angle between the spiral trend of the front half surface and the spiral trend of the rear half surface of the crossed reticular structure in the advancing direction is 1-179 degrees.
Furthermore, one end of the tubular film close to the extrusion is fixed, and the other end of the tubular film close to the folding and flattening is rotated, so that the spiral trend is realized.
Further, the tubular film is a single-layer film or a multi-layer co-extruded film.
The invention has the advantages that: according to the blown film with the strength increased, after the tubular film extruded by the blow molding die head is rotated, the tubular film generates a spiral trend in the advancing process, and then the front half surface and the rear half surface of the tubular film are subjected to hot pressing to form a cross-woven net-shaped structure, so that the longitudinal strength and the transverse strength of the co-extruded film formed by blow molding can be greatly improved without increasing the material thickness or changing the material type; the strength of the blown film of the invention in the longitudinal and transverse directions can reach 2 to 10 times of the strength of the common blown film made of the same material.
Drawings
FIG. 1 is a schematic illustration of the preparation of an enhanced strength blown film of the examples.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Examples
As shown in fig. 1, the present embodiment provides a blown film with increased strength, which is formed by hot pressing a blown extruded tubular film after being folded flat; the method is characterized in that: before the tubular film is folded and flattened, the linear trend 1 of the advancing direction of the tubular film is changed into a spiral trend 2, and the spiral trend 2A of the front half surface and the spiral trend 2B of the rear half surface of the tubular film form a crossed net structure during hot pressing.
In the reinforced blown film of this embodiment, the angle α between the spiral direction 2A of the front half and the spiral direction 2B of the back half of the crossed net structure in the direction of travel is 1 to 179 degrees.
In the reinforced blown film of this embodiment, the tubular film is stationary near the extruded end and rotated near the flattened end to achieve a helical profile.
In one embodiment of the present invention, the tubular film is a single layer film or a multilayer coextruded film.
According to the blown film with the strength increased, after the tubular film extruded by the blow molding die head rotates, the tubular film generates a spiral trend in the advancing process, and then the tubular film is folded to be flat, so that the front half surface and the rear half surface of the tubular film are subjected to hot pressing to form an interwoven mesh structure, the thickness of materials is not increased, the types of the materials are not changed, and the longitudinal strength and the transverse strength of the blown film can be greatly improved; the strength of the blown film of the embodiment in the longitudinal and transverse directions can reach 2 to 10 times of the strength of the common blown film made of the same material.
The strength-enhanced blown film of the embodiment has the advantages that the longitudinal strength and the transverse strength are greatly improved, wherein the tearing strength is obvious, the common blown film has no strength in the longitudinal direction and can be directly and automatically cracked or easily torn after a damaged point appears, and the blown film made of the same material of the embodiment can not be automatically cracked in any direction and is not easy to tear after any part of the blown film is damaged.
The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent transformations fall within the protection scope of the present invention.
Claims (4)
1. A blow molding film with increased strength is formed by hot pressing a blow molding extruded tubular film after being folded flat; the method is characterized in that: before the tubular film is folded and flattened, the linear trend of the advancing direction of the tubular film is changed into a spiral trend, and the spiral trend of the front half surface and the spiral trend of the rear half surface of the tubular film form a crossed net structure during hot pressing.
2. A reinforced blown film according to claim 1 wherein: the included angle between the trend of the front half surface and the trend of the rear half surface of the crossed reticular structure in the advancing direction is 1-179 degrees.
3. An increased strength blown film according to claim 2 wherein: the tubular film is fixed at one end close to the extrusion and rotates at one end close to the folding flat end, so that the spiral trend is realized.
4. An increased strength blown film according to claim 1 or 3 wherein: the tubular film is a single-layer film or a multi-layer co-extruded film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911141927.6A CN110901032A (en) | 2019-11-20 | 2019-11-20 | Blown film with increased strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911141927.6A CN110901032A (en) | 2019-11-20 | 2019-11-20 | Blown film with increased strength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110901032A true CN110901032A (en) | 2020-03-24 |
Family
ID=69818220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911141927.6A Pending CN110901032A (en) | 2019-11-20 | 2019-11-20 | Blown film with increased strength |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110901032A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109501220A (en) * | 2018-10-31 | 2019-03-22 | 汕头市明星机械实业有限公司 | A kind of oblique pull membrane production equipment |
-
2019
- 2019-11-20 CN CN201911141927.6A patent/CN110901032A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109501220A (en) * | 2018-10-31 | 2019-03-22 | 汕头市明星机械实业有限公司 | A kind of oblique pull membrane production equipment |
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