TW200301684A - Heat treated profile extruded hook - Google Patents

Abstract

A method for forming a unitary polymeric projection or fastener comprising a thin, strong flexible backing, and a multiplicity of thin spaced hook members projecting from the upper surface of the unitary backing the method generally including extruding a thermoplastic resin through a die plate which die plate is shaped to form a base layer and spaced ridges, ribs or hook elements projecting above a surface of the base layer. When the die forms the spaced ridges or ribs the cross sectional shape of the hook members are formed by the die plate while the initial hook member thickness is formed by transversely cutting the ridges at spaced locations along their lengths to form discrete cut portions of the ridges. Subsequently longitudinal stretching of the backing layer (in the direction of the ridges on the machine direction) separates these cut portions of the ridges, which cut portion then form spaced apart hook members. The extruded hook members or cut rib hook members are then heat treated resulting in shrinkage of at least a portion of at least the hook head portion thickness by from 5 to 90 percent, preferably 30 to 90 percent.

Description

Tune 301684 ⑴ 玖, description of the invention (the description of the invention should state: H at the time of the invention, the agency < technical field, prior art, content, 'embodiment, and simple description of the drawings') Hooks (J 100p fasteners) molded hook fasteners. There are a variety of methods known in the prior art to form hook materials for hook and loop fasteners. One of the first manufacturing methods for forming hooks Including weaving loops of monofilament into fibers or thin

The film is viewed or the like, and then the filament loop is cut to form a hook. These monofilament loops are also heated to form a lead structure, such as disclosed in U.S. Patent Nos. 4,290,174, 3,138,841 or 4,454,183. These knitted hooks are generally quite durable and suitable for repeated use. However, it is generally quite expensive and rough to the touch. For use in disposable clothing and the like, it is generally desirable to provide a cheap and less abrasive hook. For these and similar applications, J., the solution is generally to use the continuous extrusion method of forming the lining and hook elements at the same time, or the hook element ^ price ^ τ < For the direct extrusion molding of the hook element, see, for example, U.S. Patent No. 5,3, 15,740, in which the hook element must be accounted for, & μ ^

The mesh lining is continuously tapered to the fishing tip so that the hook element can be called out from the molding surface. In this way, the individual hooks are bound to be bound only in a single direction ν 般, and the strength of the heads of the hook elements is also limited. The direct molding and the use of molding are, for example, proposed in US Patent No. 4,894,060. Another — method, which can form hook elements without such restrictions. The extrusion die forms a basic hook section instead of forming the hook element into the opposite shape of the cavity on the wedge surface. The die head extrudes the film and the rib structure simultaneously. Then cut the ribs through the transverse direction, and then stretch the ribs, ~ universal stretch extrusion -6- 200301684

(2)

Bars are made, and individual hook elements are formed by the ribs. The lining is extended, but the cross-section of the cutting ribs remains essentially unchanged. This separates the individual cut sections of the ribs from each other in the extension direction in which the dispersed fishing element is formed. Another way is to use this same type of extrusion method to shape the cross section of the rib structure to form discrete hook elements. For this extrusion, the basic hook cross-section or profile is limited only by the shape of the die head, and can be formed to extend in both directions, and has a hook head that does not need to be tapered to be removed from the molding surface. This is extremely advantageous for hook structures that provide higher performance and are more versatile in function. However, the limitation of this manufacturing method is to form a hook structure that is extremely narrow in the extrusion direction or the cutting direction of the ribs. It is difficult to cut the formed ribs at very closely spaced intervals at a commercially acceptable manufacturing speed. In addition, when the intervals of the cutting lengths are extremely close, the previously cut portions of the ribs have a tendency to fuse due to the heat generated by the cutting operation. Therefore, there is a need to improve this method to produce a narrower hook profile and to form a narrower hook profile at a commercially acceptable manufacturing speed.

SUMMARY OF THE INVENTION The present invention provides a preferred method for forming a single polymeric hook fastener. The hook fastener includes a thin, strong and flexible lining, and a plurality of thin and spaced apart protrusions from the upper surface of the single lining. Hook element. The method of the present invention can generally be used to form upstanding thin protrusions that may or may not be fishing elements that protrude upward from the surface of a single film liner of at least a uniaxially oriented polymer. The fishing elements each include a stem portion attached to the lining at one end and a head at the end opposite the lining of the stem portion. The head can also extend from the side of the stem part or be completely omitted to form another 200301684 which can be other forms besides the hook element

(3) Category crying. For the Jun element, it is preferred that the head protrude beyond the stem portion on at least one of the two opposite sides. At least the hook head is heat-treated to reduce the thickness of the hook head ' and thereby reduce or eliminate molecular orientation in the machine direction in at least the head. In general, hook elements suitable for use in the method of the present invention have a height dimension measured from the top surface of the liner of less than 5000 microns before and after processing. The stem and head generally have a thickness dimension of less than 1500 microns in a first direction parallel to the surface of the lining. The stem portions each have a width dimension in the range of 50 to 500 microns in a second direction that is generally at right angles to the first direction and parallel to the surface of the lining, and each of the head portions has a width dimension larger than that of the stem portion by 50. And a width dimension in the first direction between 2000 microns and a total width below 5000 microns. Generally there are at least 10 'to 20 to 200 preferred hook elements per square centimeter of substrate. Fasteners are preferably manufactured using novel forms of known methods of manufacturing hook fasteners as described in, for example, U.S. Patent Nos. 3,266313, 3,557,413, 4,001,366, 4,056,593, 4,189,809, and 4,894,060 or 6,209,177. The preferred method generally involves wiping the thermoplastic resin through a template, which is formed into ridges, ribs, or hook elements that form a substrate layer and space between the substrate layers and project above the surface of the substrate layer. These ridges generally form a cross-sectional shape of a desired protrusion (which is preferably a Jun element) to be manufactured. When the die forms spaced ridges or ribs, the cross-sectional shape of the hook element is formed by the template, and the initial thickness of the hook element is formed by horizontally cutting the ridges at spaced locations along its length to form the discrete cut portions of the ridge And formed. Next, the longitudinal stretching of the lining layer (in the direction of the ridges in the machine direction) separates these cut portions of the ridge 'and this cut portion then forms spaced-apart hook elements. 200301684

(4) The extruded hook element or the cutting rib hook element is then heat treated to produce a shrinkage of at least a part of the thickness of the hook head from 5 to 90 percent, and preferably 30 to 90 percent. In an alternative embodiment, the heat treatment is continued to shrink at least a portion of the stem portion of the hook element as well. The resulting heat-treated protrusions (preferably hooks) are essentially upright or rigid so that they do not sag towards the substrate layer or penetrate through fibers or similar substrates.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention has been further explained with reference to the accompanying drawings, wherein in several drawings, similar element numbers indicate similar parts, and among them: FIG. 1 schematically illustrates a method of manufacturing the hook fastener part of FIG. 4. . Figures 2 and 3 illustrate the structure of a bar at various stages in its processing in the method illustrated in Figure 1. Figure 4 is an enlarged perspective view of a hook fastener.

5a and 5b are respectively an enlarged partial side view and an end view of a hook element in the hook fastener portion of FIG. 4. FIG. Figures 6a and 6b are the drawings of Figure 5a and 5b after the limited heat treatment of the fishing element, respectively. Figures 7a and 7b are diagrams of Figures 5a and 5b after heat treatment of the entire hook element, respectively. 8 and 9 are enlarged partial cross-sectional views of alternative embodiments which can be used for the hook portion in the hook fastener portion according to the present invention. Fig. 10 is an alternative embodiment of an individual extruded hook element which can be heat treated according to the method of the present invention. 200301684 (5) Fig. 11 is a cross-sectional view of an alternative hook element which has been completely heat-treated according to the present invention. Figure 12 is a cross-sectional view of a heat-treated hook element according to the present invention. Figure 13 is a cross-sectional view of a fully heat-treated hook element according to the present invention. Figure 14 is a cross-sectional view of a fully heat-treated hook element according to the present invention

Referring now to Figure 4, element number 10 generally indicates a portion of a polymeric hook fastener that can be manufactured or heat treated in accordance with the present invention. The hook fastener portion 10 includes a thin, strong and flexible film-like lining 11 having substantially parallel upper and lower main surfaces 12 and 13, and a plurality of protrusions from at least the upper surface 12 of the lining 11. Between spaced hook elements 1 4. The liner may have a planar surface or surface features that may be required for tear resistance or reinforcement. As can be seen most clearly in FIG. 5, the hook elements 14 each include a branch portion 15 attached to the lining 11 at one end, which has a tapered section 16 widening toward the lining 11 to increase its contact with the lining 1. The hook fixing and breaking strength of the joint 1 are better, and the head portion 17 of the branch portion 15 is opposite to the end of the lining 11 1. The side surfaces 3 4 of the head portion 17 may be flush with the side surfaces 35 of the stem portion 15 on two opposite sides. The head 17 has hook engaging portions or arms 36, 37 which protrude beyond the stem portion 15 on one or both sides 38. The hook element shown in Figs. 5a and 5b has a rounded surface 18 opposed to the stem portion 15 to help the head 17 enter between the loops in the loop fastener portion. The head 17 also has a laterally cylindrical concave surface portion 19 at the junction between the stem portion 15 and the surface of the head 17 protruding above the lining 11. -10- 200301684

⑹ Referring to Figs. 5a and 5b, there is shown a single representative small hook element 14 in which the size is indicated by the element number between the size arrows. The height dimension is 20. The stems and heads 15 and 17 have the same thickness dimension 21 as shown in the figure, and the head 17 has a width dimension 23 and an arm droop 24. The stem portion has a width dimension 22 at the bottom thereof before being expanded 16 to the substrate film 11. 8 and 9 illustrate many alternative shapes of hook elements that can be used in alternative embodiments of hook elements that can be heat treated in accordance with the method of the present invention.

Two of them. The hook element 25 illustrated in FIG. 8 is different from the hook element 14 of FIG. 5 in that its head 26 protrudes farther from its stem portion 27 on the opposite side, and is substantially uniform in thickness, so that It can be bent more easily and combined with or separated from the loop on the loop fastener part.

The hook element 30 illustrated in FIG. 9 is different from the hook element 14 of FIG. 5 in that its head 31 protrudes from only one side of its branch portion 32, and therefore, when it is protruded from the head 31 When peeling off, a significantly larger peeling force is generated than when peeling in a direction in which the head 31 protrudes. Fig. 1 schematically illustrates a method for forming a first embodiment of a hook-and-loop fastener portion such as that of Fig. 4. Generally speaking, this method includes first extruding a strip 50 of thermoplastic resin shown in FIG. 2 from an extruder 51 through a die 52, which has, for example, A cutout having a substrate 53 and elongated ribs 54 (which have a cross-sectional shape of a hook portion or element to be formed) spaced between and spaced above the upper surface of the substrate layer 53 is cut out. Pull the strip 50 around the roller 5 5 through the cold tank 5 6 filled with cooling liquid (for example, water), and then use the cutter 5 8 to pull the rib -11-200301684

5 4 (but not the substrate layer 5 3) is cut laterally or cut at spaced positions along its length to form a dispersed portion 57 having a rib 54 having a length approximately equal to the desired thickness of the fishing portion to be formed, As shown in Figure 3. If necessary, the strip may be stretched before cutting to provide further molecular orientation to the rib-forming polymer and / or reduce the size of the rib and the resulting fishing element formed by slitting the rib. The cutter 58 can be cut using any conventional device such as a reciprocating or rotating blade, laser, or water jet, however, it is more difficult to cut with a blade oriented at an angle of about 60 to 80 degrees relative to the length of the rib 54. After the ribs 54 are cut, the substrate 5 3 of the strip 50 is stretched longitudinally at a stretch ratio of at least 2 to 1, and it is better to stretch at a ratio of about 4 to 1 at different surface speeds. Driven first pair of nip rollers 60 and 61 and second pair of nip rollers

Stretching between 6 2 and 6 3 is preferred. If necessary, the strip 50 may be stretched laterally to provide a biaxial orientation to the substrate 5 J. It is preferable to heat the mule 6 1 to heat the substrate 53 before stretching, and to cool the roller 62 so that the stretched substrate 53 is stable. There are two spaces stretched between the cutting portions 57 of the ribs 54, which in turn become the hook portions or ring members 14 that complete the hook fastener portions. The formed hook element is then heat treated to utilize a non-contact heat source 64. The temperature and duration of heating should be chosen to cause a reduction in shrinkage or thickness of at least the head from 5 to 90 percent. Non-contact heating sources include radiators, heat, flames, UV, microwave or focused IR > heat lamps. Figure 6 shows that the hook element in Figure 5 is heat treated to reduce the thickness 2 1 ′ of the fishing face 17. Other dimensions of the hook element will also change, which is roughly the result of immortal quality. Height 2 〇, generally slightly increased ’and head width -12-200301684 β 豳 Read Buy

2 3 ′ and arm droop 2 4 · Increase. The stem and the head now have a non-uniform thickness due to incomplete heat treatment along the entire hook element 1 4 ', and a thickness dimension 2Γ that tapers from the substrate to the head. In general, the untreated portion has a uniform thickness equivalent to the original thickness 21, and the portion that has been substantially completely heat treated will have a uniform thickness 2 Γ including a transition region separating the untreated and treated portions. In this specific embodiment, the incomplete heat treatment also causes a change in the thickness of the hook head 2 Γ from the tip of the arm to the portion of the arm adjacent to the stem 15 '. All other numbered elements in Figs. 6a and 6b correspond to the numbered elements in Figs. 5a and 5b.

The reduction in the thickness of the hook element is caused by the relaxation of the molecular orientation caused by at least the melt flow of the hook head and / or the branch part in the machine direction (which roughly corresponds to the thickness direction). In addition, when there is molecular orientation induced by stretching, such as when the ribs are stretched longitudinally before cutting, a further reduction in thickness occurs. Melt-induced molecular orientation occurs by melt extrusion when a polymer under pressure and shear forces is forced through a die orifice. The rib or ridge forming portion of the die produces a molecular orientation in the formed rib. This molecular orientation extends longitudinally or in the machine direction along the ribs or ridges. When cutting ribs or ridges, the molecular orientation extends approximately within the thickness dimension of the cutting rib or cutting hook element, however, the molecular orientation may extend at an angle from about 0 to 45 degrees to the thickness of the hook element. The initial molecular orientation in the hook element is generally at least 10 percent, preferably 20 to 100 percent (defined below). When the hook element is heat-treated according to the present invention, the molecular orientation of the hook element is reduced, and the thickness dimension of the hook element is reduced. The amount of thickness reduction mainly depends on the amount of molecular orientation of the hook element extending in the machine direction or hook thickness dimension. Hot place -13-200301684 (9)

The physical conditions, such as processing time, temperature, and the nature of the heat source, will also affect the reduction in thickness of the hook element. When the heat treatment is performed, the reduction in the thickness of the hook element or protrusion extends from the top of the hook head or the protrusion to the stem portion, or from the protrusion down to the substrate until the thickness of the entire hook element is reduced. In general, when the stem and hook head are both completely heat-treated or partially heat-treated to the same degree, the thickness reduction in both is substantially the same. When only a part of the hook head and / or the hook head and the branch part is heat-treated, the thickness increases from the heat-treated part (generally the head part) above to the substantially unheat-treated part of the branch part, or The transition area of the stem part and part of the hook head, which has a substantially unreduced thickness. When the thickness dimension shrinks, the width of the treated part will generally increase, while the height of the overall hook element slightly increases and the arm sagging increases. The end result is a hook thickness that cannot be manufactured economically and directly using conventional methods or that cannot be manufactured at all. The heat-treated protrusions (usually hook heads) and optionally treated stems are also characterized by a molecular orientation value of less than 10%, and preferably less than 5%, in which the substrate film layer orientation is substantially unchanged. reduce. Generally speaking, the orientation of the hook element branches or protrusions adjacent to the substrate film layer will be more than 10%, and more preferably 20% or more. Fig. 7 is a schematic diagram of the hook element of the hook of Fig. 5, wherein the entire hook element is heat-treated. In this case, both the hook head portion 1 7 " and the stem portion 1 5 " shrink in the thickness direction, while the width dimensions 23 "and 22" and the arm sag 24 "have a relative increase. In this case, the branch Both the rod and the head have a substantially uniform thickness dimension 2 factory, which is lower than the initial hook element width dimension 21. Due to the reduced thickness in the branch part, the tapered section 16 is generally higher than the original Conical14-200301684

(ίο) Section 1 6 big.

The heat treatment is generally performed at a temperature close to or higher than the melting temperature of the polymer. When the heat is significantly higher than the polymer melting temperature, the processing time is reduced to minimize any actual melting of the polymer at the hook head or the top of the protrusion. The heat treatment is performed for a time sufficient to cause a reduction in the thickness of the hook head and / or the stem, but it does not cause significant deformation of the lining or melt flow at the tip of the hook head or protrusion. Heat treatment also rounds the edges of the hook heads, which improves the feel in clothing applications.

Unexpectedly, it has been found that for high-performance micro-hooks combined with certain low-cost or low-loft loop fabrics, this heat treatment substantially improves the micro-hook-to-loop fabric combination. A particularly good novel miniature hook element that can be manufactured using the method of the present invention has been found, wherein the hook element has a height of less than 1000 microns, preferably from 300 to 800 microns, and at least one thickness from 50 to 200 microns, with a thickness of 5 A head of 0 to 180 micrometers is preferred. Other dimensions of this modified miniature hook include a stem width as defined above from 50 to 500 microns, a head width from 100 to 800 microns, and a drooping arm from 50 to 700 microns, preferably 100 to 500 microns, And at least 50 hooks per square centimeter, with a preferred hook density from about 70 to 150 hooks. This novel micro-hook section exhibits improved overall performance for a variety of low bulk loop fabrics. Suitable polymeric materials that can be used to make the hook fastener portion include thermoplastic resins, including polyolefins such as polypropylene and polyethylene, polyvinyl chloride, polyvinyl chloride, nylon, polyesters such as polyethylene terephthalate, etc. And its copolymers and blends. The resin is preferably polypropylene, polyethylene, polypropylene-polyethylene copolymer or a blend thereof. -15- 200301684 〇i) The lining of the fastener must be thick enough so that it can be attached to the substrate using desired methods such as sonic welding, thermal bonding, stitching or adhesives (including pressure-sensitive adhesives or hot melt adhesives) , And make the sticks firmly fixed, and provide tear resistance when the fastener is peeled apart. However, when using fasteners on disposable clothing, the 'liner should not be so thick that it is stiffer than needed. Generally speaking, the lining has a Gurley stiffness of 10 to 2000, preferably 10 to 200, so that when alone or laminated to other carrier lining structures such as non-woven, woven or film-type linings Material (this carrier liner should also be soft enough to be used in disposable absorbent articles) when it is perceived to be soft. The optimal lining thickness will vary depending on the resin used to make the hook fastener part, but it will generally be between 20 microns and 1000 microns, and for softer linings, the thickness will be 20 to 200 microns. good. U.S. Patent No. 6,209,177 describes another method of extruding a hook element from a die ' which results in a hook-and-loop portion such as that shown in FIG. Each element includes a stem portion 41 protruding from the surface of the lining material 42 and a fishing head 43 protruding laterally from the end of the stem portion 41 in at least one direction. The thickness of the hook element 40 which is perpendicular to the protruding direction of the hook head 43 of the hook element 40 gradually increases from the top of the fishing head 43 to the end of the substrate which rises from the stem portion 41. For these hook elements 40 ', as opposed to the cutting ribs and the drawing lining substrate, each of the hook elements 40 is formed independently of each other and integrally molded with the surface of the lining substrate 42. The bright resin is extruded through the template. However, in this method, the die face including the spot die face is vertically reciprocated by sliding up and down in contact with each other. The polymer flow is interrupted to the die element forming the ridge . Filial piety in extrusion molding. Medium 'molten resin continues to form the substrate, and at the same time the ascending / descending element rises -16- (12) (12) 200301684 and the downward movement interrupts the flow to the rib section, resulting in a plurality of self-lining materials and the substrate 42 extending continuously Separate the vertical line of the hook element 40. Test Method 1 3 5 Degree Peel Test A 1 3 5 degree peel test is used to measure the amount of force required to peel a sample of the mechanical fastener hook material from a sample of the ring fastener material. Using a double-sided tape, a ring test material sheet of: 1 cm x 12.7 cm was firmly placed on a steel sheet of 51 cm x i2.7 cm. Place the ring material on the board so that the transverse direction of the ring material is parallel to the long dimension of the board. Cut out the .9 · cm × 2.5 cm strips of the mechanical fastener to be tested, where the long dimension is in the machine direction of the base material. Attach a paper guide of 2.5 cm to the smooth side of one end of the bar. Then place the hook strip in the center of the loop so that there is a contact area of 1.9 cm x 2.5 cm between the strip and the loop material, and the leading edge of the strip is along the length of the plate. The lamination of the strip and the ring material was then manually rolled twice in each direction using a 1000 g roller at a rate of approximately 30.5 cm per minute. The sample was then placed in a 5 ° peel-off rack. The cracker was placed in the bottom jaw of the InstronTM Model 122 tensile tester. Place the loose end of the paper guide in the jaw above the tensile tester. A chart recorder using a sliding beam speed of 3 0.5 cm per minute and a chart speed set at 50.8 cm per minute was used to record the peel force when the hook bar was peeled from the loop material at a constant angle of 135 degrees. Record the four highest academic averages in grams. Record the force required to remove the mechanical fastener strip from the loop material in grams / 2.54 cm width. Perform a minimum of 10 tests and average the combination of each hook and loop. -17 · 200301684 〇3) Use two different paint ring materials to measure the performance of mechanical fastener hook materials. The loop material "A" is a non-woven loop similar to that described in Example 1 of U.S. Patent No. 5,616,394, purchased from 3M Company KN-1971. The loop material "B" refers to a knitted loop manufactured in accordance with XML-1-01-16 of US patent 5,605,729, which is described in Example 1 in Chinese. The ring test material is derived from the material's edge. Please obtain it after unrolling and discarding several circles to expose the "new" material. Female 7 The loop test material that the subject arrived at was in a relatively compressed state, and it was before any significant re-fluffing of the loop would occur. The dimensions of the example fishing materials were measured using a Leica microscope equipped with a free thermal # lens with a magnification of about 25 X. The sample is placed on a stage movable in the χ-y direction 'and measured by moving the stage to the nearest micrometer. Repeat a minimum of three times for A inch and average. With reference to the examples and comparative implementations, the fishing angles are roughly depicted in Figs. 5, 6, 7, 11, 12, 2, 3, and 14; 20 indications, arm dips are indicated by distance 24, and hook thicknesses are indicated by distance 2 1. Molecular orientation and crystallization

The orientation and crystallinity of hook materials in the examples and comparative examples were measured using X-ray diffraction technology. A Bruker microdiffractometer (Bruker AXS, Madison, Wisconsin) was used, and HiSTARTM 2-dimensional detector records were collected to collect teachings using copper Kα radiation and scattered radiation.婊 七 Wo number Su. The diffractometer is equipped with a graphite monochromatic light emitter for incident incident light and a 200-micron pinhole penetrating ancient medium ^, a countersunk hole straight instrument. X-ray source consists of 50 volts -18- 200301684

(14) Rigaku RU200 (Rigaku USA, Danvers, MA) rotating anode and copper I & operating at (kV) and 100 milliamps (mA). Data was collected using transmission geometry. The center of the detector was at 0 degrees (2Θ) and the distance from the sample to the detector was 6 cm. The specimen is obtained by cutting a thin section of the hook material in the machine direction after removing the hook arm. The incident beam is orthogonal to the plane of the cutting slice 'and is therefore parallel to the transverse direction of the extruded substrate. Use laser pointer and digital camera alignment system to measure three different positions. The measurement is performed near the center of the head 17, near the midpoint of the stem portion 丨 5, and as close as possible to the bottom of the stem portion i5 which is only slightly higher than the surface 丨 2 of the lining 11. Accumulate data for 3600 seconds and use gaDDStm software (Bruker AXS, Madison,

Wisconsin) corrects detector sensitivity and spatial linearity. The crystal index was calculated as the ratio of the area of the crystalline peak to the area of the total front (crystalline + amorphous) in the scattering angle range of 6 to 32 degrees (2 Θ). A value of 1 represents 100% crystallinity and a value of 0 corresponds to a completely amorphous material (0% crystallinity). The molecular orientation percentage is calculated from the radial trace of the two-dimensional diffraction data. It is assumed that the background and the intensity of the amorphous are linear between the positions (A) and (C) defined by the following, and the positions of our 2 61 are linear. For each element, the background and non-Japanese intensity in the trace (b) are interpolated and subtracted from the trace to produce (B,). Trace (B,) (Figure Oscillation Intensity Pattern in the absence of Orientation or in the presence of a Better Orientation

/ 、 It has a certain strength. The size of the crystal ratio without a better orientation is defined by the minimum value in the case of Zhen i I q. The magnitude of the orientation crystallization ratio is defined by the strength exceeding the minimum value of the Zhentangu pattern. The percentage of orientation is calculated by integrating the individual components of Gamma # ’from the trace (β’). Trace (A): 3 times before the edge of the same scene and the intensity of the amorphous; along the radial direction 12.4-12.8 -19- 200301684

Degree (20), 0.5 degree step size. Trace (B): random and oriented crystalline ratio, background scattering, and amorphous strength; 13.8-14.8 degrees (20) along the χ radial direction, 0.5-degree step size. Trace (C): trailing background edge and amorphous intensity; 15.4 to 15.8 degrees (20) along the χ radial direction, 0.5 degree step size. Trace (B '): The random and oriented crystallization ratio obtained by subtracting the amorphous and background intensity from the trace (B). Center of scattering angle of trace (Α) · (12 · 4 to 12.8) degrees = 12.6 degrees 20 Center of trace (B): (13.8 to 14.8) degrees = 14.3 degrees 20 Center of trace (C): (15 · 4 To 15.8) degrees = 15.6 degrees 20 interpolation constant = (14 · 3-12 · 6) / (15 · 6-12 · 6) = 0.57 for each array element [i]: intensity (not quality + back *) [ i] = [(C [i]-A [i]) * 0.57] + A [i]

Bf [i] = B [i] -intensity (non-% quality + back f) [i] The graph of B '[i] versus [i]: B' (random) [i] = the smallest of the oscillation patterns The value of the intensity value B, (orientation) [i] = B- [i]-B 丨 (random) [i] uses the Simpson integration technique and the area below to calculate the percentage of orientation material.

Bf [i] = total crystalline area (random + orientation) = area (¾sum)

Bf (orientation) [i] = orientation crystalline area = area (orientation) B '(st machine) [i] = random crystalline area = area (random) orientation material% = (area (orientation) / area (total *)) X 100 Comparative Example C 1 -20 · 200301684

(16) Use the device shown in Figure 1 to make the base material of the mechanical fastener hook material. Polypropylene / polyethylene was extruded using a 6.35 cm single screw extruder (24: 1 L / D) with a barrel temperature distribution of 177 ° C-232 ° C-246 ° C and a die temperature of approximately 235 ° C Impact copolymer (SrC7-644) was extruded vertically downward through a die with a cut made by an electronic discharge machine. After forming with the die, the extrudate was placed in a water tank at a width of 6.1 meters. The speed per minute was maintained at about 100 ° C with cold water. The base material was then passed through a cutting station where the ribs were cut transversely at an angle of 23 degrees measured from the transverse direction of the base material (but not the base material). Layer). The cutting interval is 3.05 micrometers. After cutting the ribs, the substrate of the base material is stretched longitudinally between the first pair of nip rollers and the first pair of nip rollers at a stretch ratio of about 4.1 · 1 The individual hooks are further separated to about 8 hooks / cm. There are about 10 rows of ribs or cut hooks per cm. The upper roller of the first pair of nip rollers is heated to 143t and stretched to soften the base material. The general outline of this Jun is drawn from Figure 5. Example 1 t The base material of Comparative Example C1 was passed at a speed of 90 m / min. 36 △ knife see "under the axe burner Aerogen (Altoon Hampshire, υκ) (the gap between the 虮 to the film is 8 mm), and make the base material on its hook example 2 non-contact heat treatment. Flame work i] Jinping π hemp & human flame power is M 耳 joules / hour. The side branch of the Kekeqian β-cedar film is supported, held on and held on an approximately quenching roller. Therefore, <heat treated> am, The service pattern is depicted in Figures 6a and 6b. The performance of the hook material 5 ^ # 枓 基 枓 on the non-woven loop material "A" was measured using the 135 ° test. -Ao-approximately 63% larger than Example C1. -21- 200301684

(17) Example 2

The base material of Comparative Example C1 was subjected to a non-contact heat treatment on its hook side by passing the base material at a speed of 2.1 m / min under a group of 6-1000 watt 1-micron wavelength infrared bulbs. The distance between the hook and the bulb is about 2.5 cm. The smooth substrate film side of the base was supported on a quench roll maintained at about 66 ° C. The general shape of the resulting heat-treated hook is depicted in Figures 7a and 7b. The performance of the hook material base material on the nonwoven loop material "A" was measured using a peel test, and the results are shown in Table 1 below. The 135 ° peeling force of the heat-treated base material was approximately 206% greater than that of the comparative example C 1 without heat treatment. Comparative Example C2 The base material of the mechanical fastener hook material was manufactured as in Comparative Example C1, except that the base material was extruded at a speed of 9.1 meters per minute to increase the amount of molecular orientation induced by melt flow in the extrudate. . The general shape of this hook is depicted in FIG. 5. Example 3

The base material of Comparative Example C2 was subjected to non-contact heat treatment on its hook side by passing the base material under a group of 6-2000 watt 1 micron wavelength infrared lamps at a speed of 3.0 m / min. The distance between the hook and the bulb is about 1.6 cm. The smooth substrate film side of the base was supported on a quench roll maintained at about 66 ° C. The peel test was used to measure the performance of the hook material base material on the non-woven loop material "A". The results are shown in Table 1 below. The 135 ° peel force of the heat-treated base material was about 37% greater than that of the comparative example C2 without heat treatment. Comparative Example C 3 The base material for manufacturing mechanical fastener hook materials is the same as Comparative Example C 1 except that there are 16 rows of hooks per centimeter, and the openings in the die are formed after heat treatment-22 · 200301684 (is) The shape shown in Figure 11 is produced. Example 4 The base material of Comparative Example c3 was passed through a group of 3-4500 watt 3 micron infrared light bulbs at a speed of 10.0 meters per minute, and the base material was subjected to non-contact heat treatment on its hook side to produce such materials A hook element having a hook head portion 7 7, a stem portion 75, and a substrate 7 3 shown in FIG. 11. The distance between the hook and the bulb is about 2.5 cm. The smooth substrate film side of the base was supported on a chilled roll maintained at about 66 ° C. The performance of the hook material base material on the non-woven loop material "A" was measured using a 135 ° peel test, and the results are shown in the following table. The peeling force of the heat-treated base material was lower than that of the comparative example C 3 + # 254% which was not heat-treated. Example 5 The base material of Comparative Example C3 was perforated under the perforated metal plate at 25.0 m / min, and the base material was subjected to non-contact potential treatment on the hook side thereof to produce a substrate having a substantially 1 Shaped hook element shown in 1 1. The temperature provided by the 15 kw electric heater was approximately 185. The heat of 〇 First, the roll is blown at a speed of about 33 m / min through the perforations in the metal plate on the fishing side of Keke. The hook distance is about 46 cm. Make the base material smooth on the substrate 7 Squeeze rollers at approximately 149 ° C. After the heat treatment, the base material was cooled by keeping the base lightly quenched at 5 7 ′ ′ ^. The test of 丨 3 was used to measure the performance of the fishing material scraping off a branch of base material on the non-woven ring material "A", which is π in the following table i. 〜 ~ The peeling force of the processed material is about 136% greater than that of Example C3 without heat treatment. Office ...

Jt compares with Example C4 -23-(19) 200301684 as in Comparative Example c. The opening in the die is cut to form the base material before cutting.

1 Manufacture of mechanical fasteners Hook material base material as shown in Figure 14 (interval after heat treatment is 267 microns. Except for and after pulling through the base material of the comparative example to move meters / divided a group of 3-4500 watts 3 micron wavelength The speed of the infrared light bulb is generated by non-contact heat treatment on the side of the hook. The base material is at 90 °. The distance between the hook and the bulb is about 25 cm. The film side support of the hook element is maintained at about The test of the smooth substrate on the step roller measures the performance of the hook material base material on the non-woven loop material "A ^ 135. The release material" B ", the results are shown below. The ring-knitted material was heat-treated. The stripping force of the material is about 112% greater than that of the comparatively wide range without heat treatment, and when using the ring material "b", it is larger than C4, which is larger than that of Example C5. Base material of fastener hook, except for using high density polyethylene resin (D450 4 5 MI, 0942 density, mixed with 2% MB50 Shi Xi _ / pp masterbatch (D〇w-Xinjiang §) processing aids) Chevron philips), and form an extrudate at a melting temperature of approximately 238 °. In the die The opening was formed to produce the outer shape 80 as depicted in Figure 12. After the extrudate was chilled and the ribs were cut, the base was oriented in the machine direction 3.5: 1. Example 7 The base of Comparative Example C 5 was passed The material passes under a group of 6-2000 watt 1 micron infrared light bulbs at a speed of 40 meters per minute, so that the base material is subjected to non-contact heat treatment on its fishing side, resulting in hooks substantially as shown in FIG. 13-24 -200301684

(20) Element 85. The distance between the hook and the bulb is about 1.6 cm. Make the base smooth. The substrate film side is supported on a chilled roll maintained at about 66 ° C. The performance of the hook material base material on the non-woven loop material "A" was measured using a 135 ° peel test, and the results are shown in Table 1 below. The peeling force of the heat-treated base material was about 15 1% larger than that of Comparative Example C 5 without heat treatment. Table 1 Hook material Hook width Jun height Arm hanging hook thickness Peeling force ring Peeling force ring (μιη) (Mm) (μιη) (μιη) "Α" (gram) "B" (gram) C1 536 573 217 340 202 663 582 301 85 329 172 180 638 Vertical C4 611 819 262 257 382 541 6 774 992 399 154 811 716 C5 448 500 143 341 186 _ Suspect 7 547 526 174 201 466 Series ·

Comparative Examples C 2 and 3 were measured to show changes in molecular orientation and crystallinity due to the heat treatment of the base material of the present invention. The results are shown in Table 2 below. When heat is applied to the alignment hook element, the molecular orientation decreases greatly from the top toward the substrate, and the crystallinity increases due to the annealing effect. -25-200301684

(21) Table 2 Crystal index of fishing material (top) Molecular orientation% (top) Molecular orientation% (body) Molecular orientation% (substrate) C2 0.30 36.3 52.0 85.6 3 0.39 0.0 0.0 80.4 Illustration of symbolic representation of the drawing 10 Hook fastener Sections 11, 42 12 13 14, 14 ', 25, 30, 40, 80, 85, 90 15, 15, 15 ", 27, 32, 41, 75 16, 16" 17, 17', 17 ,, 26 , 31, 43, 77 18 19 20 &gt; 20f 21, 21, 21 "?? χ

MM U ^ U 24, 24 *, 24 ,, lining Upper surface Lower surface Hook element Branch part Conical section Head Rounded surface Transverse cylindrical concave surface part Height dimension Thickness dimension Width arm

34 Side of head 35 Side of branch -26-200301684

36, 37 Hook coupling part or arm 38 Side 50 Strip 51 Extruder 52 Die head 53, 73 Base material 54 Rib 55 Roller 56 Cooling groove 57 Dispersion part 58 Cut-off device 60, 61, 62, 63 Clip light 64 Non-contact heat source

-27-

Claims (1)

200301684 Scope of patent application 1. A single hook fastener that can be flexibly elastically polymerized, comprising a substrate having substantially parallel upper and lower major surfaces, each square centimeter having at least 50 intervals protruding from the upper surface of the substrate An open hook element having a height measured from the upper surface of less than 1000 micrometers, each including a stem portion attached to the substrate at one end, and opposite to the substrate at the stem portion The distal head, at least the head has a thickness from 50 to 200 microns in a first direction substantially parallel to the surface of the lining. 2. The single hook fastener according to item 1 of the patent application scope, wherein the stem portion has a second direction in a range of 50 to 500 micrometers which is substantially at right angles to the first direction and parallel to the surface of the lining The width of the head is larger than that of the stem portion and the total width in the second direction is from 100 to 800 microns, and the arm has a droop from 50 to 700 microns. 3. The single hook fastener according to item 2 of the scope of patent application, wherein the spring thickness of the head is from 50 to 800 μm and the sagging of the arm is from 100 to 500 μm. 4. The single hook fastener according to item 1 of the patent application scope, which has hook elements spaced between 70 and 150 per square centimeter. ‘5. A single hook fastener according to item 1 of the scope of the patent application, wherein the polymeric material is a thermoplastic resin, and the hook head has rounded corners. 6. A single hook fastener according to item 5 of the patent application scope, wherein the substrate has a substantially uniform thickness between the upper and lower surfaces between 30 and 200 microns. 200301684 7. A single hook fastener according to item 6 of the patent application, wherein the polymeric material includes polyethylene, polypropylene, polypropylene-polyethylenefluorene copolymer, or a blend thereof. 8. A single hook fastener according to item 1 of the patent application scope, wherein at least the head has a molecular orientation of less than 10 percent. &gt; 9. A single hook fastener according to item 8 of the scope of patent application, wherein the bottom of the hook element adjacent to the substrate has a molecular orientation of at least 10%. 10. The single hook fastener according to item 2 of the patent application scope, wherein the thickness of the hook portion φ is smaller than the thickness of the stem portion below the hook portion. 11. The single hook fastener according to item 2 of the patent application scope, wherein the thickness of the hook portion is substantially the same as the thickness of the stem portion below the hook portion. 12. A single hook fastener according to item 10 of the application, wherein the hook portion has an arm extending beyond the stem portion, and the thickness of the hook portion arm varies from the tip of the hook portion arm to the adjacent branch of the hook portion arm The part of the pole. 13. —A method for forming a single fastener, comprising the steps of extruding a thermoplastic resin in a machine direction through a cavity having a continuous substrate portion cavity and φ one or more ridge cavities extending from the cavity of the substrate portion cavity. A template that is sufficient to induce melt flow molecular orientation in a polymer flowing through at least the spine cavity, self-extruding the thermoplastic resin through the spine cavity to form protrusions, and The thickness of the material, heat treatment at temperature and time. 14. The method for forming a single fastener according to item 13 of the scope of patent application, wherein the protrusion is a hook-shaped protrusion with a stem portion and a head. 200301684 Application: Boxing Garden Recitation 15. The method for forming a single hook fastener according to item 13 of the scope of the patent application, wherein the formed hook is tied to the hook head enough to shrink at least a part of the hook portion from 5 to 9 0% temperature and time heating. 16. The method for forming a single hook fastener according to item 14 of the scope of patent application, wherein the hook portion is formed by extruding continuous ridges having the shape of a hook element, cutting the ridges and then stretching the substrate layer to make individual The cutting ridges are separated into discrete hook portions. 17. The method for forming a single hook fastener according to item 15 of the scope of patent application, wherein at least a part of the hook head is contracted by at least 30%. 18. The method for forming a single hook fastener according to item 15 of the scope of patent application, wherein the head and the stem part are at least partially contracted by 30%. 19. A resilient and flexible polymeric resin fastener comprising a substrate having substantially parallel upper and lower major surfaces, the substrate having upstanding protrusions spaced from and protruding from the upper surface of the substrate, wherein the The protrusions on the upper part have a molecular orientation of less than 10% and the adjacent film has a molecular orientation of more than 10%. 20. The fastener according to item 19 of the patent application scope, wherein the protrusion comprises a hook element having a stem portion and a hook head, wherein the hook element has a height measured from the upper surface of less than 5000 microns Each of which includes a stem portion attached to the substrate at one end, and a head portion at the end of the stem portion opposite the substrate, at least the head portion having a distance from 50 to 1500 microns approximately parallel to the The thickness in the first direction of the surface of the lining. 200301684 21. The hook fastener according to claim 20, wherein the branch portion has a range of 50 to 500 micrometers in a second direction that is substantially perpendicular to the first direction and parallel to the surface of the lining. Width; the head has a greater width than the stem portion and the total in the second direction. The width is from 100 to 5000 microns. w 22. The fastener according to item 21 of the scope of patent application, wherein the hook elements are arranged at a density of at least 10 per square centimeter. 23. The fastener according to item 20 of the scope of patent application, which has hook elements spaced between 20 and 200 per square centimeter. 24. The fastener according to item 20 of the patent application, wherein the polymer material is a thermoplastic resin. 25. The fastener according to item 24 of the scope of patent application, wherein the substrate has a substantially uniform thickness between 30 and 200 microns between the upper and lower surfaces. 26. The fastener according to item 25 of the patent application scope, wherein the polymeric material comprises polyethylene, polypropylene, polypropylene-polyethylene copolymer or a blend thereof. φ 27. A single hook fastener according to item 17 of the scope of patent application, wherein the thickness of the hook portion is smaller than the thickness of the stem portion below the hook portion. 28. A single hook fastener according to item 17 of the patent application, wherein the thickness of the hook portion is substantially the same as the thickness of the stem portion below the hook portion. 29. A single hook fastener according to item 17 of the scope of patent application, wherein the hook portion has an arm extending beyond the branch portion, and the thickness of the hook portion arm varies from the tip of the hook portion arm to the abutment of the hook portion arm. Parts of branches.