CN112537545A - Winding film rewinding process and anti-falling stretching winding film - Google Patents
Winding film rewinding process and anti-falling stretching winding film Download PDFInfo
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- CN112537545A CN112537545A CN202011451425.6A CN202011451425A CN112537545A CN 112537545 A CN112537545 A CN 112537545A CN 202011451425 A CN202011451425 A CN 202011451425A CN 112537545 A CN112537545 A CN 112537545A
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- China
- Prior art keywords
- winding
- film
- winding film
- stretching
- rewinding process
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
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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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
-
- 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
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H37/00—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Abstract
The invention discloses a winding film rewinding process and an anti-falling stretching winding film, and belongs to the technical field of packaging film production. The rewinding process of the winding film comprises a folding process, a pre-stretching process and a swinging process; folding the winding film with the edges of the left side and the right side within the range of 0-100mm into double layers, thinning the winding film by the pre-stretching process, and eccentrically rolling the pre-stretched winding film by the swinging process. Through above-mentioned rewinding technology, the tight winding membrane of rolling mother is cut the rolling again and is become a plurality of soft son book, and the product has bigger back space that contracts in the son book, and the edge is the bilayer in every layer of winding membrane in the son book simultaneously, and the stress intensity at edge is bigger, therefore the winding membrane that finally obtains should not damage, prevents falling the performance and also improves greatly.
Description
Technical Field
The invention belongs to the technical field of packaging film production, and particularly relates to a winding film rewinding process and an anti-falling stretching winding film.
Background
The winding film is also called as a stretched film, and is a film material for industrial production, which is obtained by heating and melting raw materials, then carrying out casting or co-extrusion, and carrying out processes such as rolling and the like.
The winding film is usually made of thin material, and the film can be broken even if slightly collided and scraped in the using process, so that great waste can be caused; in some industries with rough use methods and use environments, the waste rate of the winding film can reach more than 10 percent, and the production cost of enterprises is greatly increased; the increase of the thickness of the winding film can reduce the probability of film breakage to a certain extent, but the increase of the thickness of the winding film can increase the production cost of the winding film, and meanwhile, the winding film with larger thickness is difficult to recycle and degrade, and can cause larger pollution to the environment.
Starting from the production, winding and other processes of the winding film, the mechanical strength of the winding film is improved, and the anti-falling performance, the breaking tensile strength and the like of the winding film can be fundamentally improved. For example, in chinese patent application CN201710173079.1 (a drop-resistant PE wrap film and a method for manufacturing the same), a wrap film is obtained by a three-layer process, and the upper end of the molten material in the die head is clamped and pulled upward by arranging a clamping and stretching device in the process of winding the wrap film, so that the end face toughness of the wrap film can be improved, and the end face damage caused by collision can be prevented, so that the drop-resistant performance and the fracture stretching rate are greatly improved. However, the method in the patent of the invention needs to improve production raw materials, production equipment, production process and the like, needs to completely update the production process of an enterprise, brings higher improvement cost for the enterprise, and is difficult to realize.
In addition, the winding film obtained by winding film production enterprises in the prior art is usually a relatively flat mother roll after winding is completed, the edge of the mother roll is neat, and the adhesion force between two layers of winding films in the roll is large. When directly taking female book to use, neat edge is very easy impaired, and then causes the destruction to the winding membrane, and the volume of contracting of winding membrane is little in female book simultaneously, and the breakage rate can increase. Therefore, in the actual production, the mother roll after being rolled can be reprocessed, the original winding film production line is not changed, and extra production cost is not brought to enterprises; but also can improve the performance of the winding film and meet the use requirements of customers.
Rewinding the mother roll, namely rewinding the wound film mother roll after the mother roll is wound, improving the shape of the whole wound film and increasing the retraction space of the whole wound film by adopting a specific rewinding process, obtaining the anti-falling stretch film with good anti-falling performance and good fracture stretch performance, and reducing the waste rate of the wound film in the use process.
Therefore, the development of the process for rewinding the winding film to improve the properties of the winding film such as falling resistance, breaking strength and the like has positive practical significance.
Disclosure of Invention
The invention aims to solve the technical problems that the winding film in the prior art is poor in anti-falling performance, complex in improvement process, difficult to realize and the like.
In order to solve the technical problem, the invention discloses a winding film rewinding process, which comprises the following steps:
(1) and (3) folding edges: carrying out edge folding treatment on the winding film in the mother roll;
(2) pre-stretching: pre-stretching the edge-folded winding film through a plurality of rollers with different rotating speeds to thin the winding film;
(3) swinging: and (3) eccentrically rolling the pre-stretched winding film to obtain sub-rolls with wavy edges on the left and right sides of the product, namely the anti-falling stretching winding film.
Further, in the process of folding, the winding film in the mother roll passes through a folding clamp, so that the left and right side edges of the winding film in the mother roll are folded into double layers within the range of 0-100mm of each side edge.
Further, in the prestretching process, prestretching the folded winding film through 4 rollers, wherein the rotation speed ratio of the 4 rollers is 1: 1-5: 1-5: 1-5; preferably, the rotation speed ratio is 1:1.5: 1: 2. the cylinder that the rotational speed is different can stretch the processing to the winding membrane of winding on the cylinder, because the winding membrane is tensile material, and the rotational speed is different, and different length direction's winding membrane can receive the pulling force to stretch the winding membrane, consequently the winding membrane can the attenuate. In actual production, the rotating speed ratio between the rollers can be selected according to the performance requirements of the required products so as to obtain winding films with different thinning degrees. The film discharging linear speed of the anti-falling stretch winding film is 0-1500m/min, and the rotating speed of the roller is adjusted according to the film discharging linear speed and the actual production condition.
Further, the thickness of the winding film after the pre-stretching is 1/10-1, preferably 1/3-1/2 of the thickness of the winding film before the pre-stretching.
Furthermore, in the swinging process, an eccentric disc is arranged on the winding force arm of the sub-roll, and the motor drives the eccentric disc to drive the winding force arm to swing so as to perform left-right eccentric winding on the pre-stretched winding film. In actual production, the degree of left-right eccentricity can be selected according to the performance requirement of the required anti-falling winding stretch film, so that the swing amplitude of the wavy edge of the sub-roll obtained after rewinding can be adjusted.
Furthermore, each mother roll is subjected to a rewinding process to obtain a plurality of sub rolls.
Further, the product has 1-50 swings, preferably 10-30 swings, in each sub-roll.
Further, in each sub-roll, the swing amplitude of the wavy edges at the two ends of the product is 0-300 mm.
The invention also claims an anti-falling stretching winding film obtained by the winding film rewinding process.
Compared with the existing products, the rewinding process of the winding film and the obtained anti-falling stretching winding film have the following advantages:
(1) the winding film rewinding process is simple to operate, large processing operation equipment is not needed, and higher production cost cannot be brought to enterprises;
(2) the winding film rewinding process is suitable for rewinding operation of winding film parent rolls with different specifications and sizes, and is wide in application range;
(3) the rewinding process of the winding film can improve the process parameters in the folding, pre-stretching and swinging processes according to the performance requirements of the final product so as to obtain the anti-falling and stretching winding film products with different performances, can be customized according to the requirements of customers, and is more flexible to operate;
(4) the anti-falling stretching winding film obtained by the winding film rewinding process is soft in winding, so that the retraction space is larger, and the damage of the winding film can be reduced;
(5) the anti-falling stretching winding film obtained by the winding film rewinding process has the hems at the edge, so that the stress strength of the edge is greatly increased, the breakage resistance is greatly improved, and the anti-falling performance is better.
Drawings
FIG. 1: a process flow chart of a winding film rewinding process.
Detailed Description
The technical solution of the present invention will be described in detail by the following specific examples.
Example 1
A winding film rewinding process comprises the following processes:
(1) and (3) folding edges: feeding the tightly wound and compacted winding film mother roll obtained by winding through the winding film production process into a folding clamp, and folding the winding film in the mother roll to enable the edges of the left side and the right side of the winding film in a mother roll product to be folded into double layers within the range of 0-100mm of each edge;
the thickness of the edge of the folded winding film is increased, so that the stress strength of the edge of the winding film is increased, the mechanical strength of the winding film is improved, and the winding film is not easy to damage;
(2) pre-stretching: passing the wound film subjected to edge folding treatment through 4 rollers with different rotating speeds, and performing 3-section pre-stretching on the wound film subjected to edge folding treatment, so as to thin the wound film; after pre-stretching, the thickness of the winding film is 1/3-1/2 of the thickness of the winding film before pre-stretching;
specifically, in 4 rollers with different rotating speeds, the rotating speeds of the 4 rollers are 100rpm, 150rpm and 200rpm in sequence according to the pre-stretching process sequence, namely the rotating speed ratio of the 4 rollers is 1:1.5:1.5: 2.
(3) Swinging: the pre-stretched winding film is eccentrically rolled, specifically, an eccentric disc is arranged on a rolling force arm of the eccentric rolling, and the eccentric disc is driven by a motor to drive the rolling force arm to swing so as to eccentrically roll the pre-stretched winding film left and right.
The sub rolls obtained after the rewinding process are the anti-falling stretch film, and each mother roll can obtain a plurality of sub rolls after the rewinding process; in the finally obtained sub-roll, the two sides of the product present wavy edges, and the swing amplitude is 0-300mm, so that the thickness of the product within 300mm of the edges is only half of that of the product at the center in the sub-roll product. If the collision happens, the sub-rolls have larger retraction space, and the damage of the winding film product can be reduced.
When high-speed rolling is adopted, the thickness of the raised grains generated at the edge of each sub-roll can reach 2-3mm, so that a large amount of deformation space is formed at the edge of the product, and the whole roll of the product can have 10-30 swing amplitudes.
In the embodiment 1, the mother roll is an original winding film which is wound compactly, the specification is 30 Kg/roll, the size of the conventional winding film is 500mm in width, 500m in length and 20um in thickness, after the winding film is subjected to rewinding process treatment, a plurality of sub rolls with small specifications are obtained after slitting and rewinding, and after the winding film in the sub rolls is subjected to edge folding, pre-stretching and swinging treatment, the sub rolls obtained by rewinding are softer, so that the retraction space of the sub rolls in the use process is larger, and the capability of resisting external damage is stronger.
The rewinding process can be carried out on the mother rolls with different specifications by selecting the edge folding tools, the rollers, the winding mechanisms and the like with different specifications and sizes to obtain small rolls with soft structures, and the small rolls have good anti-falling performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (9)
1. A winding film rewinding process is characterized in that: the method comprises the following steps:
(1) and (3) folding edges: carrying out edge folding treatment on the winding film in the mother roll;
(2) pre-stretching: pre-stretching the edge-folded winding film through a plurality of rollers with different rotating speeds to thin the winding film;
(3) swinging: and (3) eccentrically rolling the pre-stretched winding film to obtain sub-rolls with wavy edges on the left and right sides of the product, namely the anti-falling stretching winding film.
2. The wound film rewinding process as claimed in claim 1, characterized in that: in the process of folding, the winding film in the mother roll passes through a folding clamp, so that the left and right edges of the winding film in the mother roll are folded into double layers within the range of 0-100mm of each edge.
3. The wound film rewinding process as claimed in claim 1, characterized in that: in the prestretching process, prestretching the folded winding film through 4 rollers, wherein the rotation speed ratio of the 4 rollers is 1: 1-5: 1-5: 1-5.
4. The wound film rewinding process as claimed in claim 1, characterized in that: the thickness of the wound film after pre-stretching was 1/10-1 of the thickness of the wound film before pre-stretching.
5. The wound film rewinding process as claimed in claim 1, characterized in that: in the swinging process, an eccentric disc is arranged on the winding force arm of the sub-roll, and the motor drives the eccentric disc to drive the winding force arm to swing so as to perform left-right eccentric winding on the pre-stretched winding film.
6. The wound film rewinding process as claimed in claim 1, characterized in that: and each mother roll is subjected to rewinding process to obtain a plurality of sub rolls.
7. The wound film rewinding process as claimed in claim 6, characterized in that: in each sub-roll, the product has 1-50 swings.
8. The wound film rewinding process of claim 7, wherein: in each sub-roll, the swing amplitude of the wavy edges at the two ends of the product is 0-300 mm.
9. A drop-resistant stretch wrap film obtained by the wrap film rewinding process of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011451425.6A CN112537545B (en) | 2020-12-09 | 2020-12-09 | Winding film rewinding process and anti-falling stretching winding film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011451425.6A CN112537545B (en) | 2020-12-09 | 2020-12-09 | Winding film rewinding process and anti-falling stretching winding film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112537545A true CN112537545A (en) | 2021-03-23 |
| CN112537545B CN112537545B (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011451425.6A Active CN112537545B (en) | 2020-12-09 | 2020-12-09 | Winding film rewinding process and anti-falling stretching winding film |
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| CN112537545B (en) | 2022-08-16 |
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