CN107374828B - Hole-forming mesh cage and method for producing film by using same - Google Patents
Hole-forming mesh cage and method for producing film by using same Download PDFInfo
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- CN107374828B CN107374828B CN201710506741.0A CN201710506741A CN107374828B CN 107374828 B CN107374828 B CN 107374828B CN 201710506741 A CN201710506741 A CN 201710506741A CN 107374828 B CN107374828 B CN 107374828B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
- A61F13/5121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations characterised by the vertical shape of the apertures, e.g. three dimensional apertures, e.g. macro-apertures
- A61F13/5122—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations characterised by the vertical shape of the apertures, e.g. three dimensional apertures, e.g. macro-apertures and comprising secondary apertures, e.g. macro-apertures in combination with microapertures
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Manufacturing & Machinery (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention discloses a perforated forming cylinder mould and a method for producing a film by adopting the perforated forming cylinder mould, wherein the method for producing the film comprises the following steps: the method comprises the steps that a polyolefin mixture is melted and extruded by a screw extruder and flows out through a T-shaped die head to form a casting film, when the formed casting film reaches the opening forming mesh cage, the vacuum pump operates to enable air inside the forming drum to be sucked out, internal and external pressure difference is formed on the internal and external surfaces of the casting film, the casting film forms an opening thin film with funnel-shaped small holes, the hole pattern of the small holes is consistent with that of through holes in the opening forming mesh cage, meanwhile, perforating needles of the opening forming mesh cage pierce the casting film, and the casting film forms funnel-shaped large holes. After the perforated forming mesh cage and the production method are adopted, the cast film can simultaneously form big holes and small holes, the winding equipment, the unwinding equipment and the transportation link are omitted, and the perforated forming mesh cage has the advantages of reducing the cost, improving the production efficiency and preventing the secondary pollution of materials.
Description
Technical Field
The invention relates to the field of production of perforated films, in particular to a perforated forming mesh cage and a method for producing a film by adopting the same.
Background
Apertured films are widely used in the facing layers of sanitary napkins and pantiliners, also known as dry mesh. However, the apertured film has the disadvantages of plastic feel, poor flexibility, slow absorption speed and the like, and in order to improve the disadvantages, CN200620057798.4 proposes an apertured film structure, wherein capillary holes extending from a first surface of the film to a second surface of the film form convex film corners on the second surface of the film, and simultaneously, micropores with larger aperture areas are formed on the second surface of the film to the first surface, and the second surface of the film is used as a use front surface which is in contact with human skin when the film is applied. The corner bulges of the film can enable the reverse side of the film to form unsmooth 'suede' which is used as the front side of the hygienic product, so that the contact elasticity of the film product and the skin can be increased, the use comfort is improved, and the small holes and the large holes coexist, and the absorption speed is increased. Application No.: CN200380101939.7 also refers to this film, and in order to keep the small holes from collapsing and closing when the large holes are formed, a thermal insulation device is used to protect the small holes when the large holes are formed. However, in the prior art, an off-line secondary punching mode is adopted, as shown in fig. 1 and 2, firstly, a casting film 1 passes through a vacuum punching device 1' consisting of a punching forming cylinder mould, a cylinder mould supporting cavity and a vacuum pump, a punching film 11 with a small hole structure is formed under the action of internal and external pressure difference, and then the film is wound. The apertured film 11 with the small holes is unreeled by an unreeling device and is secondarily perforated by a mechanical perforating device 12 to form the large holes, so that the apertured film 2 with the small holes and the large holes is formed by rolling. So adopt the secondary mode of punching, mainly because at the course of processing the aperture, need inhale brokenly at high temperature vacuum, trompil film 2 after the shaping is stereotyped slower, needs longer process to solidify the design, just can keep aperture fine hair not squashed the deformation at mechanical punching in-process, and is closed, otherwise can influence the absorptivity and the sense of touch of trompil film. However, in the production method, due to secondary processing, the perforated film 11 needs to be formed, then is wound, transported to mechanical perforation forming equipment and then is unwound, so that the energy consumption is high, secondary pollution to materials is easily caused in the transportation process, and more materials are wasted.
Disclosure of Invention
The invention aims to overcome the defects of the existing perforating device and provides a perforating forming mesh cage capable of simultaneously forming a perforated film with a small-hole structure and a large-hole structure and a method for producing the perforated film by adopting the same.
In order to achieve the above purpose, the solution of the invention is:
a perforated forming net cage is a cylindrical metal body, a peripheral wall of the net cage is provided with a plurality of through holes, the outer surface of the peripheral wall is provided with a plurality of perforating needles, the thickness of the peripheral wall is 0.5mm to 1.2mm, and the number of the through holes is 20 to 1600/cm 2 The area of the single through hole is 0.03mm 2 ~2.5mm 2 The number of the perforating needles is 3 to 50/cm 2 Said single punch pin baseThe area of the part is 0.4mm 2 ~5mm 2 And the area of the bottom of the single perforating needle is at least more than 2 times of the area of the single through hole.
The through holes are connected through ribs, and the ribs are provided with line protrusions or point protrusions protruding outwards.
The height of the line bulge or the point bulge is 0.02mm to 0.2mm.
The outer surface of the peripheral wall has a plurality of raised regions and recessed regions.
The height difference between the convex area and the concave area ranges from 0.5mm to 2mm.
The through holes are arranged on the convex area and the concave area.
The raised area is provided with the perforating needle.
The height of the perforating needle is 0.5 mm-5 mm.
A method of producing a film comprising the steps of: melting and extruding the polyolefin mixture through a screw extruder, and enabling the polyolefin mixture to flow out through a T-shaped die head to form a casting film, wherein the casting film is wound through the open pore forming cylinder mould which is fixed on a forming drum connected with a vacuum pump; the forming drum has a vacuum suction opening area located at one side of the forming drum; the vacuum pump operation makes the inside air of forming drum be sucked out, and when the curtain coating membrane reachd the vacuum suction mouth region, the internal and external pressure differential is formed to the internal and external surface of curtain coating membrane, and curtain coating membrane formation infundibulate aperture, the pass of aperture with the aperture of the through-hole on the trompil shaping cylinder mould unanimous, simultaneously the punching needle of trompil shaping cylinder mould puncture curtain coating membrane, the curtain coating membrane formation infundibulate macropore to curtain coating membrane formation has macropore and the trompil film of aperture.
The temperature of the casting film at the inlet of the vacuum suction port area is 70-350 ℃.
The vacuum degree of the forming drum is 0.01MPa to 0.1MPa.
After the hole forming cylinder mould and the production method are adopted, the casting film is formed after the polyolefin mixture is melted, the surface has certain temperature when reaching the vacuum suction port area, and the vacuum pump sucks air in the forming drum out, so that the casting film forms small holes which are consistent with the hole pattern of the hole forming cylinder mould through holes in the vacuum suction port area due to the action of the internal and external pressure difference. Meanwhile, the casting film is in contact with the perforating needle on the surface of the opening forming mesh cage, the perforating needle easily punctures the casting film with certain temperature to form a large hole with the opening direction opposite to that of the small hole, so that the small hole and the large hole of the opening film are quickly and synchronously formed on the opening forming mesh cage. Compared with secondary punching, the production method saves winding equipment, unwinding equipment and transportation links, can also save energy consumption, reduce cost, improve production efficiency and prevent secondary pollution of materials, reduces the extrusion of secondary winding on the hole pattern due to the simultaneous forming of the small hole and the large hole, effectively improves the hole pattern keeping of the small hole and the large hole, and prevents the hole pattern from being closed, thereby reducing the risks of side leakage and back leakage caused by the slow absorption speed of body fluid due to the closing of the hole patterns of the small hole and the large hole.
Drawings
FIG. 1 is a flow chart of a conventional production process of an open-pore membrane having a structure of small and large pores 1;
FIG. 2 is a flow chart 2 for producing a conventional apertured film having both small and large aperture structures;
FIG. 3 is a production flow chart of example 1 of the present invention;
FIG. 4 is an enlarged view of a portion of the apertured formed cylinder mould according to example 1 of the present invention;
FIG. 5 is a top view of an apertured film produced in accordance with example 1 of the present invention;
FIG. 6 is a cross-sectional view of an open-cell film produced in example 1 of the present invention;
FIG. 7 is a cross-sectional view of an open-cell film produced in example 2 of the present invention;
FIG. 8 is a production flow chart of example 3 of the present invention;
FIG. 9 is an enlarged view of a portion of the apertured formed cylinder mould according to example 3 of the present invention;
FIG. 10 is a top view of an apertured film produced in accordance with example 3 of the present invention;
FIG. 11 is a cross-sectional view of an apertured film produced in accordance with example 3 of the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in figures 3 to 11, the invention discloses a hole forming cage A which is a cylindrical metal body, the peripheral wall of the cage A is provided with a plurality of through holes A1, the outer surface of the peripheral wall is provided with a plurality of punching needles A2, the thickness of the peripheral wall is 0.5mm to 1.2mm, and the number of the through holes A1 is 20 to 1600/cm 2 The area of the single through hole A1 is 0.03mm 2 ~2.5mm 2 The number of the perforating needles A2 is 3 to 50/cm 2 The area of the bottom of the single perforating needle A2 is 0.4mm 2 ~5mm 2 And the area of the bottom of each A2 perforating needle is at least 2 times of the area of each through hole, and the height of each perforating needle ranges from 0.5mm to 5mm. .
The production method for producing the film by adopting the perforated forming net cage A comprises the following production steps: melting and extruding a polyolefin mixture through a screw extruder, and enabling the polyolefin mixture to flow out through a T-shaped die head B to form a casting film 1, wherein the casting film 1 is wound around the open pore forming cylinder mould A, and the open pore forming cylinder mould A is fixed on a forming drum C connected with a vacuum pump; the forming drum C has a vacuum suction opening area C1 located at one side of the forming drum; the vacuum pump operation makes the inside air of forming drum C sucked out, when curtain coating membrane 1 reachd vacuum suction mouth region C1, the internal and external pressure difference of internal and external surface formation of curtain coating membrane 1, curtain coating membrane 1 forms infundibulate aperture 21, the pass of aperture 21 with the aperture of the last through-hole A1 of trompil shaping cylinder mould A unanimous, simultaneously trompil shaping cylinder mould A's perforating needle A2 puncture curtain coating membrane 1, curtain coating membrane 1 forms infundibulate macropore 22 to curtain coating membrane 1 forms trompil film 2 that has macropore 22 and aperture 21.
Example 1:
as shown in FIGS. 3 to 6, the cast film 1 was produced by melt-extruding through a screw extruder and flowing out through a T-die B using 45% LDPE 100AC,45% LLDPE 7050 and 10% functional master batch as raw materials. The apertured forming cylinder mould a is fixed on a forming drum C connected with a vacuum pump. The hole forming cylinder mould A is a cylindrical metal body, the peripheral wall of the cylinder mould A is provided with a plurality of through holes A1, and the periphery of the cylinder mould A is provided with a plurality of through holes A1The outer surface of the wall is provided with a plurality of perforating needles A2; the number of the through holes A1 is 800/cm 2 The area of a single through hole A1 is 0.15mm 2 The number of the perforating needles A2 is 25/cm 2 The area of the bottom of the single perforating needle A2 is 2.5mm 2 The height of a single perforating needle A2 is 2.5cm, the area of the bottom of the single perforating needle A2 is 16.67 times of the area of a single through hole A1, and the perforating needle A2 is fixed on the peripheral wall of the open-pore forming cylinder mould A in an embedding or plug-in mode; the forming drum C is a vacuum cylindrical supporting cavity, and a vacuum suction port area C1 positioned on one side of the forming drum C is arranged on the forming drum C. When the vacuum pump is operated, air in the forming drum C is sucked, when the casting film 1 with a certain temperature reaches the vacuum suction port area C1, the formed internal and external pressure difference sucks the surface of the casting film 1 into the funnel-shaped small holes 21, and meanwhile, the perforating needles A2 on the surface of the perforating forming net cage A pierce the casting film 1 to form the funnel-shaped large holes 22, so that the perforating film 2 with the large holes 22 and the small holes 21 is formed. Wherein: the temperature of the casting film 1 at the inlet of the vacuum suction area C1 is 70 to 350 ℃, preferably 200 ℃, and the vacuum degree of the forming drum is 0.01MPa to 0.1MPa, preferably 0.08MPa.
After the trepanning forming mesh cage A and the production method are adopted, the surface of the casting film 1 has certain temperature when reaching the vacuum suction port area, so that the casting film 1 can easily form a small hole 21 consistent with the hole pattern of the through hole A1 in the vacuum suction port area due to the action of internal and external pressure difference, and the punching needle A2 on the surface of the trepanning forming mesh cage A can easily puncture the casting film 1 with certain temperature to form a large hole 22 with the trepanning direction opposite to that of the small hole 21, so that the large hole 22 and the small hole 21 of the trepanning film 2 can be quickly and synchronously formed on the trepanning forming mesh cage A, the cost and the energy consumption are reduced, the production efficiency is improved, and secondary pollution of materials is prevented. Meanwhile, the large holes 22 and the small holes 21 are formed simultaneously, so that the extrusion of secondary rolling to the hole patterns of the small holes 21 is reduced, the hole pattern retention of the small holes 21 and the large holes 22 is effectively improved, the hole pattern closing is prevented, the low body fluid absorption speed caused by the closing of the small holes 21 and the large holes 22 is reduced, and the risks of side leakage and back leakage are easily caused.
Example 2:
Example 3:
as shown in FIGS. 8 to 11, 25% of LDPE 100AC,65% of LLDPE 7050 and 10% of functional masterbatch were used as raw materials, and upon production, they were melt-extruded through a screw extruder and flowed out through a T-die B to form a casting film 1. Fixing a hole forming net cage A on a forming drum C connected with a vacuum pump, wherein the hole forming net cage A is a cylindrical metal body, the peripheral wall of the hole forming net cage A is provided with a plurality of through holes A1, and the outer surface of the peripheral wall of the hole forming net cage A is provided with a plurality of punching needles A2; and the outer surface of the peripheral wall of the open-pore forming net cage A is provided with a convex area A3 and a concave area A4, and the height difference between the convex area A3 and the concave area A4 is 0.5 mm-2mm, preferably 1mm. The raised area A3 is provided with through holes A1 with the same size as the depressed area A4, the perforating needles A2 are positioned on the raised area A3, and the number of the through holes A1 is 250/cm 2 The area of a single through hole A1 is 0.5mm 2 The number of the perforating needles A2 is 50/cm 2 The area of the bottom of the single perforating needle A2 is 1.5mm 2 The height of a single perforating needle A2 is 3.5cm, the area of the bottom of the single perforating needle A2 is 3 times of the area of a single through hole A1, and the perforating needle A2 is fixed on a convex area A3 of the open-pore forming cylinder mould A in an embedding or plug-in mode; the forming drum C is a vacuum cylindrical supporting cavity, and a vacuum suction port area C1 positioned on one side of the forming drum C is arranged on the forming drum C. While the vacuum pump is running, the building drum CInside air is sucked out, when the curtain coating membrane that has the uniform temperature reachs vacuum suction mouth regional C1, the internal and external pressure difference that forms absorbs and breaks into funnel-shaped aperture 21 with curtain coating membrane 1 surface, curtain coating membrane 1 can adsorb in the surface of trompil shaping cylinder mould A simultaneously, because the existence of protruding region A3 and the depressed region A3 on trompil shaping cylinder mould A surface, curtain coating membrane 1 that has the uniform temperature can be stereotyped for concave-convex structure after the cooling, and trompil shaping cylinder mould A2 on surface punctures curtain coating membrane 1, form funnel-shaped macropore 22, thereby form trompil film 2 that has concave-convex structure and macropore 22, aperture 21, macropore 21 is located trompil film 2's concave part 24 of concave-convex structure. Wherein: the casting film 1 at the inlet of the vacuum suction area C1 has a temperature of 70 to 350 ℃, preferably 180 ℃, and the vacuum degree of the forming drum C is 0.01MPa to 0.1MPa, preferably 0.05MPa.
After the opening forming cylinder mould A and the production method are adopted, the surface of the opening forming cylinder mould A is provided with the convex area A3 and the concave area A3, so that the casting film 1 with a certain temperature can be shaped into a concave-convex structure after being cooled, and the concave part 24 is provided with the big holes 22. Embodiment 3 not only realizes the rapid and synchronous production of the concave-convex structure, the big holes and the small holes on the perforated molding net cage A, reduces the cost and the energy consumption, improves the production efficiency and prevents the secondary pollution of materials; meanwhile, when the apertured film 2 is applied to the surface layer of the sanitary towel or the protective pad, the concave-convex structure of the apertured film 2 is beneficial to the permeation and absorption of body fluid and the storage of small blood clots, the small blood clots are prevented from being in direct contact with the skin, the dryness performance is improved, the concave part 24 of the apertured film 2 is provided with the large holes 22, the permeation speed of the body fluid is further improved, and the occurrence of poor absorption conditions such as side leakage and back leakage is effectively prevented.
Claims (10)
1. An trompil shaping cylinder mould which characterized in that: the metal body is cylindrical, a peripheral wall of the metal body is provided with a plurality of through holes, a plurality of punching needles are arranged on the outer surface of the peripheral wall, the thickness of the peripheral wall ranges from 0.5mm to 1.2mm, and the number of the through holes ranges from 20 to 1600/cm 2 The area of the single through hole is 0.03mm 2 ~2.5mm 2 The number of the perforating needles is 3 to 50/cm 2 The area of the bottom of the single perforating needle is 0.4mm 2 ~5mm 2 The area of the bottom of each single perforating needle is at least more than 2 times of the area of each single through hole; the method for producing the film by adopting the perforated forming cylinder mould comprises the following production steps: melting and extruding the polyolefin mixture by a screw extruder, and allowing the polyolefin mixture to flow out of a T-shaped die head to form a casting film, wherein the casting film is wound around the open pore forming cylinder mould which is fixed on a forming drum connected with a vacuum pump; the forming drum has a vacuum suction opening area located at one side of the forming drum; the vacuum pump operation makes the inside air of forming drum be sucked out, and when the curtain coating membrane reachd the vacuum suction mouth region, the internal and external pressure differential is formed to the internal and external surface of curtain coating membrane, and curtain coating membrane formation infundibulate aperture, the pass of aperture with the aperture of the through-hole on the trompil shaping cylinder mould unanimous, simultaneously the punching needle of trompil shaping cylinder mould puncture curtain coating membrane, the curtain coating membrane formation infundibulate macropore to curtain coating membrane formation has macropore and the trompil film of aperture.
2. The open-celled profiled cylinder mould as defined in claim 1 wherein: the through holes are connected through ribs, and the ribs are provided with line protrusions or point protrusions protruding outwards.
3. The open-celled profiled cylinder mould as defined in claim 2 wherein: the height of the line bulge or the point bulge is 0.02mm to 0.2mm.
4. The open-celled profiled cylinder mould as defined in claim 1 wherein: the outer surface of the peripheral wall has a plurality of raised regions and recessed regions.
5. The apertured formed cage of claim 4, wherein: the height difference between the convex area and the concave area is 0.5 mm-2mm.
6. The open-celled profiled cylinder mould as defined in claim 4 or 5 wherein: the through holes are arranged on the convex area and the concave area.
7. The apertured formed cage of claim 4, wherein: the raised area is provided with the perforating needle.
8. The open-celled profiled cylinder mould as defined in claim 1 or 7 wherein: the height of the perforating needle is 0.5 mm-5 mm.
9. The open-celled profiled cylinder mould as defined in claim 1 wherein: the temperature of the casting film at the inlet of the vacuum suction port area is 70-350 ℃.
10. The open-celled profiled cage as recited in claim 1, wherein: the vacuum degree of the forming drum is 0.01MPa to 0.1MPa.
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| CN201710506741.0A CN107374828B (en) | 2017-06-28 | 2017-06-28 | Hole-forming mesh cage and method for producing film by using same |
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| CN201710506741.0A CN107374828B (en) | 2017-06-28 | 2017-06-28 | Hole-forming mesh cage and method for producing film by using same |
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| CN108357184A (en) * | 2018-01-12 | 2018-08-03 | 厦门延江新材料股份有限公司 | A kind of preparation method of composite membrane |
| CN108773092A (en) * | 2018-04-27 | 2018-11-09 | 厦门延江新材料股份有限公司 | A kind of production method of composite membrane |
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| CN101400839A (en) * | 2006-07-14 | 2009-04-01 | 弗莱斯纳有限责任公司 | Apparatus for producing textiles, nonwoven substances, spunbonded fabrics, paper materials and/or perforated films |
| CN1943530A (en) * | 2006-11-13 | 2007-04-11 | 蔡子辛 | Composite punching film and its producing method |
| CN202186964U (en) * | 2011-07-29 | 2012-04-11 | 苏州斯迪克电子胶粘材料有限公司 | Hot melt adhesive double-sided adhesive tape |
| CN104981337A (en) * | 2012-12-05 | 2015-10-14 | 屈德加薄膜产品股份有限公司 | Method for providing micro-aberrations on a film |
| CN106064490A (en) * | 2016-07-07 | 2016-11-02 | 厦门延江新材料股份有限公司 | The production method of a kind of perforated film and true hole perforating device thereof |
| CN106319763A (en) * | 2016-08-25 | 2017-01-11 | 厦门延江新材料股份有限公司 | Perforated non-woven cloth and preparation method thereof |
| CN207785370U (en) * | 2017-06-28 | 2018-08-31 | 厦门延江新材料股份有限公司 | Trepanning is molded cylinder mould |
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