JPH04500100A - Improved pinned roller and method for producing fibrillated film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Improved pinned roller and method for producing fibrillated film Background of the invention FIELD OF THE INVENTION This invention relates to improved production of fibrillated material webs, and more particularly to Producing fibrillated film from polyolefin resin for filter materials Related to pinned rollers suitable for building. Furthermore, the present invention is disclosed in U.S. Patent No. , 880,173, which relates to improvements in the method and apparatus of That disclosure is incorporated herein by reference.

Polyolefins to produce films with a network of interconnected fibers It is well known to fibrillate resin films. This process is for film Stretching the film to orient the polymer chains or crystal structure in the direction of travel and various methods for splitting the film and creating a fiber network structure. the oriented film. Especially the orientation , achieved by stretching the web using rollers rotating at different surface speeds. be done. Methods for impacting oriented films include liquid jets such as water. or gas jets, blades, bottles, teeth, laser beams, Twisting of the oriented film, embossing of the oriented film, and fusing before orientation. May include film embossing. Prior U.S. Patent No. 3,880,173 No. 1,442,593, as well as the corresponding British Patent No. 1,442,593, clearly but limitedly It is a filter material for filtering cigarette smoke rather than cellulose acetate. Fibrillated polyolefin membranes are an alternative to Tate-class filter materials. Related to obtaining film materials. The polyolefin material described is polyolefin material. Propylene, polyethylene or mixtures thereof or propylene and ethylene Contains a copolymer and optionally a diacid to facilitate production of thin fiber strands. A finely divided whitening agent such as titanium chloride may be included.

According to the fibrillation method described in U.S. Pat. No. 3,880,173, polio The lefin raw materials are heated, mixed and extruded into thin films. film is swollen and longitudinally slit to form a film that is smoothed; They are stacked in multiple thin film layers approximately 10-15 microns thick. This multiple layer The film is passed through an oven at elevated temperature, during which it is passed over rollers at different speeds. The film is stretched to orient the molecular structure in the longitudinal direction. and oriented The film passes over a rotating roller with a plurality of protruding bins.

The pinned roller rotates at a surface speed higher than the linear speed of the web. Therefore low A pin protruding from the roller contacts the overlapping layers moving at a relatively low speed and splits them.

The result is a fibrillated material that is an internal connection of fibers with free ends. A web is produced. and the fibrillated material is a fibrillated film. A stuffer box with a crimping device is installed in the usual manner to create a crimp during the process. The polyolefin tow is thereby formed. to crimp is the production of a wavy shape in the fiber caused by rapid deceleration of the advancing fiber. secondary curl, which corresponds to the wrinkle-forming effect when the fiber is folded within it. Contains limp.

For the formation of filters for smoking articles, secondary crimps in particular are often subjected to tension, etc. The polyolefin is removed from the tow by washing and the tow blooms. The filtrate is formed into a fluff-like aggregate, and the filtration process is carried out using a conventional filter rod making machine. Formed into a luta rod. binders such as vinyl acetate, by known methods. It can be included in tow to form a filter rod.

One problem with known fibrillated polyolefin materials is that they retains filtration properties comparable to cellulose acetate filters, but The problem is that it does not have the low mass necessary to reduce the manufacturing cost (1st place).There are also other problems. The reason is that the existing tow has a network structure of uniform quality. This is Phil This is the case in the use of tartow materials where relatively short lengths of tow are used.

Yet another problem is that existing equipment for the production of fibrillated reticular fMJs is Creating the interconnected fiber network consumes considerable power and produces considerable noise. is to occur.

Furthermore, despite years of development efforts, the Fibrillation provides the advantages and benefits of regular cellulose acetate filters The commercial use of filters for smoking articles containing polyolefin materials has not been realized. do not have.

Therefore, rather than cellulose acetate, it is preferable to use Furthermore, it is particularly effective, easy, and inexpensive to use as a filter tow material. Vine, a filter with a homogeneous tissue strand network structure, applied for filtration of cigarette smoke. For the production of brilled tow materials, the film of materials based on polyolefin resins is There is a continuing need for apparatus and methods for fibrillation.

Summary of the invention The object of the invention is its use as a filter tow material, especially as a tobacco warehouse smoking article. Improved filtration rate per unit weight of fibrillated material for use in Producing an improved fibrillated polyolefin film network with The objective is to provide equipment and methods for building.

Another object of the invention is to provide a fibrillated film with improved uniformity. Impact modification of oriented polyolefin materials to form a textured structure. The objective is to provide improved devices and methods.

According to the invention, an improved roller with a bottle protruding from its surface (with a bottle) is provided. roller) to split the film into a network of fibrillated strands. In order to advance the oriented polyolefin film material to impact A method of using such a roller with a bottle is provided. The present invention generally comprises rollers. -It is related to

This roller has multiple substantially uniformly sized bins clearly defined around the roller surface. The bins are arranged in a tangential pattern and their bins are more tangentially related than the roller surface. Projecting at a range of angles. Furthermore, the present invention provides a progressing film. impact in an advantageous manner, resulting in substantially improved uniformity and even more random distribution. free end and amazingly improved unit weight when formed into filter material. Such bottled rows for making fibrillated materials with filtration properties per volume. Regarding how to use ra.

With a special pattern at regular intervals on the surface of the bin, and also with the direction of rotation of the rollers. further in the opposite direction at an angle ranging from about 40 degrees to about 75 degrees to the tangent to the roller. The diameter of the bottle is about 0.2 mm to 0.8 mm, and the number of bottles per inch is about 15 to about 1. Using a binned roller with bins protruding from the surface with a pin density of 0.00 We found that it is possible to obtain a surprisingly improved fiber network structure by I put it out.

The pin pattern of the present invention includes a plurality of rows of bins, each row of which has a staggered spacing (s have bins arranged in a pace-staggered relationship, i.e. they are It is made to extend across the surface of the roller. The double row of bottles is a - through putter. spaced preferably equidistantly around the circumference of the roller surface to provide It is. In a preferred embodiment, the diameter of the bottle is approximately 190 mm and the protrusion length of the bottle is approximately 190 mm. There are 90 double rows spaced around the rollers with approximately 1.0 mm (bin The protrusion length is measured from the tip of the bottle at right angles to the tangent to the roll surface).

The density of the bins in each row (ppi) is about 25 to about 34 bottles per inch; More preferably, the offset across the two rows is about 25 ppi.

In one embodiment, the rows of bins are rolled in a line that is oblique to a line parallel to the roller axis. - extends across the surface of the column, with immediately adjacent rows slanting in opposite directions . In other embodiments, the rows extend in a line parallel to the axis of the rollers, but in a straight pattern. directly adjacent, spaced rows of sinusoids with a sinusoidal pattern in contrast to the curves are arranged either in phase or out of phase across the roll, and the waveform is approximately It has a wavelength of 15 mm to about 40 mm and an amplitude of about 2.0 mm to about 6.0 mm.

An advantageous bin pattern is that the oriented unfibrillated film is rolled on binned rollers. when placed in contact with the rollers at an arc of approximately 20 to 45 degrees The relative linear velocity between the surface and the advancing film (known as the fibrillation ratio) 1.6:l to about 3.4:1. It has also been found to provide brilled materials. The fibrillation ratio is determined by the following formula: be justified. : Linear speed of roller (m/m1n) Fibrillation ratio = □ Unfibrillated through rollers Film linear velocity (m/m1n) The improved properties of the resulting fibrillated material are particularly Cellulose acetate tow is suitable as a filter material. filter length using traditional filter rod manufacturing equipment used to make For the fibrillated polyolefin material made according to the present invention formed in Improved toe yield (observed from yieldl). Toe yield is Obtained from the following formula: Pressure drop (mm W G) Toweild”X100% Net weight of fiber in rod (mg) Net weight is measured in milligrams for a given filter rod length . The pressure drop is at a flow rate of 1,050 m1 per minute through the net weight of the rod. It is measured in millimeters. A large toe field means that the free end will run more. dam, and the filtration performance per net weight of the fiber strand network is more This corresponds to a more efficient use of polyolefin materials.

An advantage of the present invention is that when contacting the advancing non-fibrillated film, the motor Pin perforation provided by rollers that can be driven more evenly by It is in the point that the turn can provide. The motor is also a traditional known bottled roller Less power consumption and less noise. These advantages are due to the staggered bins of the present invention. The pattern contacts the arcuate region of the advancing oriented fibrillated film. A brief description of the drawing that is believed to be the result of a programmed sequential method. These and other objects and advantages of the present invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings. , it will become clear. Note that the same reference symbols in the figures indicate the same parts.

FIG. 1 is a side perspective view of a roller with bins of the present invention. FIG. 2 is a perspective view of the roller of FIG. 1. FIG.

FIG. 3 is an enlarged side cross-sectional view taken along line 3--3 of FIG.

FIG. 4 is a front view of a roller in a second embodiment of the present invention.

FIG. 5 is a partial front view of a roller according to a third embodiment of the present invention.

FIG. 6 shows a roller of the invention contacting a polyolefin film according to the invention. It is a schematic diagram.

day of the year As illustrated in FIGS. 1-5, examples of the invention include an arc of the roller surface 12. contact with the film 20 of unfibrillated material advancing on the compacting and splitting the material to thereby form a fibrillated film 22; It includes a pinned roller 10 that is applied to.

With respect to FIG. 1, the roller IO is approximately 190 mm in diameter and approximately 115 mm in length.

Approximately 100mm surface width includes bottle 16, and progresses from approximately 50mm to 90mm be wide enough to contact the entire width of the film. tilted to the axis of roller 10 a pair of parallel lines 15a and 15b extending across the surface of roller 10 on In the row 14, the bins 16 are spaced apart in a staggered relationship and Immediately adjacent rows are slanted in opposite directions, creating a chevron shape.

In FIG. 1, they are arranged in a staggered relationship along two parallel lines 15. Only column 14 is shown to represent bin 16. The pattern is roller 10 In the case of a roller that repeats itself around the surface of and is about 190 mm in diameter preferably corresponds to a total of 180 lines in bin 16, with 90 pairs of equally spaced columns. stomach.

As shown in detail in FIG. 2, the centers of the two parallel lines 15a and 15b are , corresponding to the two parallel lines of bin 16, approximately 0.05 inches (1.27 m The distance between the oppositely inclined rows 17 and 18, which are spaced 0 m), is Approximately 0.1 inch (2.54 mm) at the closest edge and approximately 0.1 inch at the farthest edge. It is 375 inches (9.53 mm). Chevron pattern slopes oppositely The intersection of the rows occurs outside the roller surface 12 and forms an angle of approximately 4.0 degrees. be.

In FIGS. 2, 4, and 5, the centers of the parallel lines 15 are shown as solid lines, and the The bins 16 are represented by vertical dashes. In one embodiment, the pin density The degree is about 25 lines per inch, and they are arranged in a staggered relationship between two parallel lines. It is.

In connection with FIG. 4, another example of a bin pattern is shown, in which The rows 14 of bins 16 are arranged in a sinusoidal pattern intersecting a line parallel to the axis of the rollers 12 and immediately adjacent rows of bins are also in phase and arranged in a sinusoidal pattern. about 1.12 inch (28,45 mm) frequency and 0.12.5 inch (3,175 mm) An amplitude of mm) is used. In this embodiment, the centers 15a and 1 of the parallel sine lines are The distance between 5b is approximately 0.05 inch (1,27 mm) and the bin density of the row is 1 Approximately 25 bottles per inch. The distance between adjacent columns 14a and 14b is Measure around the circumferential surface of the cell from corresponding zero amplitude to zero amplitude position, approximately ．． It is 63mm.

FIG. 5 shows a second alternative embodiment of a sine bin pattern. In this example, Bin 1 Immediately adjacent parallel rows 14 of 6 are 180 degrees out of phase and approximately 1.12 inches apart. (28°45mm) and amplitude of 0.125 inch (3,175mm). It is held and placed. Parallel in a pair of staggered rows 14 of each bin 16 The distance between the centers L5a and 15b of the sine line is approximately 0.05 inch (1.27 mm) and the bin density is approximately 25 bins per inch. Directly adjacent column 14a and 14b is the corresponding zero amplitude to zero amplitude around the circumferential surface of the roll. It is measured up to the position of , which is approximately 6.63 mm.

With reference to FIG. 3, the bin 16 is oriented tangent to the roller 10 from the surface 12 At an angle of approximately 60 degrees, it is directed at angle A in the direction opposite to the direction of rotation of the roller. It's protruding, like it's sticking out. The protrusion length of the bottle 16 is from the tangent to the roll surface. Measure vertically to the tip of the bottle and it will be approximately 1. 'omm, and the diameter of the bottle is approximately 0.483 It is mm.

With reference to FIG. It is possible to incorporate it into conventional equipment for the purpose of integration. unfibrillated and oriented The film 20 advances at a selected speed, e.g. The speed is in the range of 50m. Roller 10 rotates in the same direction as film 20 However, since the speed is fast, the film 20 is scratched by the bottle 16. The film 2o is placed in the bin 1 to form a fibrillated film 22. It will split at 6. Preferred fibrillation ratios range from about 1.2 to about 2.8. more preferably from about 1.8 to about 2.2.

The film 20 is controlled within a range of about 20 degrees to about 45 degrees, preferably about 37 degrees. Only the selected arc length that is in contact with the roller 10. The guide roller 24 is a film 20 can be used to control the amount and tension of contact arc length. The film 20 is If it does not rest on the head of bottle 16, at least some part of the film is fibrillated. the roller 10 so as to contact the surface 12 of the roller 10 as the rolled structure is formed. -Apply with sufficient tension to lO. necessary to achieve this Typical tension amounts range from about 800 bonds to about 1000 bonds (350k gf to about 450 kgf).

The method and apparatus of the present invention will be further described in connection with the following examples.

叉”L example Each of the following examples illustrates the production of fibrillated polyolefin materials according to the present invention. vinegar. A polyolefin film was made from the following mixture:

92% polypropylene homopolymer, melt index 1. 8 (23 0℃, 2. 16, gf).

7% low density polyethylene, melt index 1.0 (190℃, 2.16 kgf); and 1% polypropylene (same type as above) masterbatch, 25% titanium dioxide (rutile grade, microcrystalline structure, ultra-micronized quality).

A known blown film was used to mix these materials and produce a 35μ thick film. Extruded using film technology.

The film is then cut into six substantially equal width pieces and stacked to give an 8:1 spread. Stretching ratio, longitudinally oriented, thickness 12.4μ and toe denier approximately 50m Films were made with widths ranging from m to about 80 mm. Inventive oriented film around the arc of the outer circumference of the fibrillating roller with a bottle, and the fibrillating roller is threaded in the usual way. Texturing stuffer for crimping fibrillated film Passed it through the box.

Table 1 shows processing parameters for film advancement, film and roller with bin. Processing parameters for contact, characteristics of bottled rollers, fib after crimping The evaluation results of lylled materials are shown. In each example, the bottle with bottle used The diameter of the roller is 190 mm on the roller surface, and the scratching angle of the bottle is (corresponds to the tangent line). ) was 60 degrees.

of the 180 bins in pairs to form 90 double row bins with spaced staggered relationships. There were rows and the diameter of the bottle was 0.4826 mm.

The fibrillated material is then passed through conventional filter rod manufacturing equipment, e.g. model KDF-2 (manufactured by Heuniwelkekowa, Hamburg, Germany) With this device, the tow is formed on the filter rod using a Formed into bloomed fluffy aggregates with damping properties and filtered It was processed into a filter rod with a circumference of 24.55 mm and a length of 66 mm. It was.

In the example, three different binned rollers, referenced in the drawings, are used: Figure 2 shows oppositely tilted rows; Figure 4 shows in-phase sine rows; and Figure 5 shows different A sine sequence of phase. The identified pattern is partially visible in Figures 2, 4, or 5. Although only the diagram is shown, it should be understood that the repetition on the roller surface is It is.

acupuncture Table 2 shows the evaluation of filter materials made from the fibrillated materials of the examples. Show the results. The low and high yield values are the minimum and maximum points of the performance curve, respectively. This performance curve corresponds to the torque point for uniformly sized filter rods. C) A comparison of the relative pressure drop with respect to the change in net weight of the material. All these These examples are based on fibrillated polyolefins obtained by prior known methods and equipment. More than an infiltration rod, and even better than a regular cellulose acetate filter. Existing materials such as cellulose acetate have yields ranging from about 35% to about 7%. It provides a tow yield that shows a significant improvement of 2% but more than 5%.

The drive current for a roller with a sinusoidal pin arrangement (Example 2) has oppositely inclined rows. The drive current of the roller (Example 1) is more uniform and constant. It was confirmed that This suggests that the use of fibrillated rolls with sinusoidal bins This shows that even more uniform fibrillation can be achieved. along the longitudinal direction of the shaft. Therefore, the fibrillated tow bands produced according to Example 1 and Example 2 In the test, Example 2 showed lower fibrillation zone, i.e. film, compared to Example 1. It was found that there were fewer areas where bottle penetration did not occur. this is an improvement This is confirmation of fibrillation.

Variation of processing parameters in binned rollers with oppositely inclined rows Considering the effects, the possibility of manufacturing high yield tow was recognized.

A roller with oppositely inclined rows is arranged with a roller with a sinusoidal row in phase. Considering the effect of switching, high yield tows can be manufactured with low power consumption and low noise. It was recognized that

By combining rollers with oppositely inclined rows with rollers with sinusoidal rows in different phases. Considering the effect of switching, it was recognized that there is a possibility of producing high yield tow.

Considering the influence of the sine pin pattern for in-phase and different-phase sine pin patterns, High yield tow while having the advantages of low power consumption and low noise by using The possibility of manufacturing was recognized.

It goes without saying that one skilled in the art will realize that the invention may be practiced otherwise than as specifically described. Nor. The examples are presented for purposes of illustration and not for purposes of limitation. Therefore the book The invention is limited only by the following claims.

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Claims (1)

[Claims] 1. Apparatus for use in fibrillating polyolefin web materials Leave it behind. a rotor having a cylindrical surface and adapted to rotate about a ring line in a first direction; roller (10); from the cylindrical surface of the roller (10) opposite to the first direction; protrude at an angle (A) of about 20 to 80 degrees to the tangent of the roller in the direction It comprises a number of protruding pins (16), said pins (16) having a diameter of about 0.5 mm to about 2 mm. ．． The pin protrusion length is in the range of 0 mm, the diameter is approximately 0.2 to 0.8 mm, and said pins (16) are spaced around the cylindrical surface of said roller (10); They are arranged in a number of rows (14) with each row (14) having a diameter of 1 inch per inch. each having about 25 to about 34 pins, which extend across the surface of said roller (10). Discrepancies spaced apart in adjacent pairs of lines (15a, 15b) extending through the cut A device characterized by being in a relationship. 2. A row (14) of pins (16) is arranged around the cylindrical surface of said roller (10). 2. Apparatus according to claim 1, wherein the apparatus is arranged substantially equidistantly apart. 3. The adjacent pair of lines (15a, 15b) are substantially straight, and A number of spaced rows (14) are aligned with respect to a line parallel to the axis of the rollers. extending across the roller surface on an inclined line such that immediately adjacent rows (1718) 3. A device according to claim 2, which is oppositely inclined. 4. The adjacent pair of lines (15a, 15b) is substantially sinusoidal. The device according to item 2. 5. The sinusoidal curve (15a, 15b) has a wavelength of about 20 to about 80 mm and a wavelength of about 0. 5. The device of claim 4, having an amplitude of 1 to about 4.0 mm. 6 The sinusoidal curves (15a, 15b) have a wavelength of about 28.45 mm and a wavelength of about 3.1 6. The device according to claim 5, having an amplitude of 75 mm. 7. Directly adjacent sine rows (14) have different phases, according to claim 4. equipment. 8. Claim in which the directly adjacent sine columns (14) have a phase difference of 180 degrees. The device according to item 7. 9. The roller (10) has a diameter of approximately 190 mm, and the 90 rows (14) have a diameter of approximately 190 mm. An apparatus according to claim 1. 10 Adjacent parallel lines (15a, 15b) in row (14) are approximately 1.27 mm apart 10. The apparatus of claim 9, wherein the apparatus is arranged at: 11 Immediately adjacent oppositely sloped rows (17, 18) whose nearest neighbors are approximately 2.0 mm, with a spacing of approximately 12.0 mm at the farthest point. Place. 12. The pin (16) protrudes from the roller surface at an angle (A) of approximately 60 degrees and is approximately 0. The device of claim 1 having a diameter of 483 mm and a protrusion length of approximately 1.0 mm. Place. 13 Used to fibrillate oriented polyolefin film (20) an apparatus having a cylindrical surface and rotating about its axis in a first direction; a roller (10) adapted to; the cylindrical surface of the roller (10); from about 20 to about a tangent to the roller in a direction opposite to the first direction. comprising a number of pins (16) projecting at an angle (A) of 80 degrees; said pins (16); The protrusion length is in the range of about 0.5 mm to about 2.0 mm, about 0.2 to 0.8 m m, and further said pin (16) is attached to the cylindrical surface of said roller (10). They are arranged in a number of rows (14) spaced around the circumference, each row (1 4) has about 25 to about 34 pins per inch, which are connected to the roller (1 0) in adjacent pairs of lines (15a, 15b) extending across the surface of The oriented film is advanced at the first speed (V). , the film (20) is placed at an arc length (B) of about 20 degrees to about 45 degrees on the roller surface. means for contacting said roller (10) over said roller; The ratio of the surface linear velocity of the roller to the first velocity of the film is from about 1.8:1 to about 2. Means of rotating the roller about its axis so that it is 2:1 A device featuring: 14 A row (14) of pins (16) is arranged around the cylindrical surface of said roller (10). 14. The apparatus of claim 13, wherein the apparatus is substantially equally spaced. 15 Adjacent pairs of lines (15a, 15b) are substantially straight and parallel. In addition, a number of spaced rows (14) are arranged parallel to the axis of the roller. The immediately adjacent row (1 14. Apparatus according to claim 13, wherein 7, 18) are oppositely inclined. 16 Immediately adjacent, oppositely slanted rows (17, 18) at their nearest points approximately 2. 54 mm, and separated by about 9.53 mm at the farthest point. equipment. 17 A pin (16) protrudes from the roller surface at an angle (A) of about 60 degrees, and Claim 1 having a diameter of 0.483 mm and a pin protrusion length of about 1.0 mm. The device according to item 6. 18 The pin density is about 25 pins per inch, the contact arc (B) is about 37 degrees, and 18. The device of claim 17, wherein the fibrillation ratio is 2.2:1. 19 The pin density is about 34 pins per inch, the contact arc (B) is about 37 degrees, and 18. The device of claim 17, wherein the fibrillation ratio is 1.8:1. 20 The pin density is approximately 34 pins per inch, the contact arc (B) is approximately 30 degrees, and 18. The device of claim 17, wherein the fibrillation ratio is 1.8:1. 21 The pin density is about 25 per inch, the contact arc (B) is about 30 degrees, and 18. The device of claim 17, wherein the fibrillation ratio is 2.2:1. 22. Claim No. 2, wherein the adjacent pairs of lines (15a, 15b) are substantially sinusoidal curves. The device according to item 14. 23 The sinusoidal curve (15a, 15b) has a wavelength of about 20 to about 80 mm and a wavelength of about 0. 23. The apparatus of claim 22, having an amplitude of 1 to about 4.0 mm. 24 The sinusoidal curves (15a, 15b) have a wavelength of about 28.65 mm and a wavelength of about 3. 24. The device according to claim 23, having an amplitude of 175 mm. 25. Claim 24, wherein directly adjacent sine columns (14) have different phases. equipment. 26. Claim No. 2, wherein immediately adjacent columns (14) are 180 degrees out of phase. The device according to item 25. 27 A pin (16) protrudes from the roller surface at an angle (A) of about 60 degrees, and Claim 23 having a diameter of 0.483 mm and a protrusion length of about 10 mm. Apparatus described in section. 28 The pin density is about 25 pins per inch, the contact arc (B) is about 37 degrees, and 28. The device of claim 27, wherein the fibrillation ratio is 1.8:1. 29 The pin density is about 25 pins per inch, the contact arc (B) is about 37 degrees, and and the fibrillation ratio is 2.0:1, and the directly adjacent sinusoidal rows (14) are 180 28. The apparatus of claim 27, having different phases of . 30 rollers (10) have a diameter of approximately 190 mm, and multiple rows (14) of 90 14. The device of claim 13, having a column. 31 Adjacent pairs of lines (15a, 15b) are spaced apart by approximately 1.27 mm. The device according to item 30. 32 having a cylindrical surface and rotating about its axis in the first direction The non-fibrillated polymers are then passed over the roller (10) Polyolefin fibrillated from oriented film of lyolefin material In a method of forming a film material (20), from the cylindrical surface to a tangent to the roller in a direction opposite to the first direction; , having a number of pins (16) projecting at an angle (A) of about 20 to 80 degrees, said pins The protrusion length of the pin (16) is approximately 0.2 mm or approximately 0.5 mm to approximately 2.0 mm. The pin (16) has a diameter of 0.8 mm from the circle of the roller (10). arranged in a number of rows (14) spaced around the cylindrical surface, each row (14) has a pin density of about 25 to about 34 pins per inch; In adjacent pairs of lines (15a, 15b) extending across the surface of the roller (10) providing said rollers (10) in spaced apart staggered relationship; rotating the roller (10) about its axis at a controlled speed; The film (20) is advanced at the first speed (V) and the film (20) is moved by the roller. Contact the roller (10) on an arc (B) of about 30 to about 37 degrees on the surface; The surface speed ratio of the roller in the direction of film travel to the first speed is approximately 1.8:1 to about 2.2:1. 33 Fibrillated polyolef produced by the method according to claim 32 In film.