A holding device containing two materials

Abstract

A holding device (50) comprising a base (52) and a plurality of holding elements (54), wherein the holding device (50) includes a first thermoplastic material having a flexural modulus of 200 to 4500 MPa and a second material. The second material is selected from the group consisting of a second thermoplastic material whose flexural modulus differs from that of the first thermoplastic material by at least 10% and / or at least 100 MPa, a non-thermoplastic material present in a content strictly greater than 1 mass% of the total composition of the holding device, a mineral filler and / or plant filler whose content is 30 mass% or less of the total composition of the holding device, and combinations thereof.

Description

Technical Field

[0001] The present disclosure relates to the field of holding devices, and more particularly to holding devices including a plurality of holding elements and intended to cooperate with opposing portions such as hooks and / or loops.

Background Art

[0002] Particularly in the field of hygiene, holding devices such as hooks that cooperate with loop-side opposing portions forming the application area of the holding device are used.

[0003] Disposable diapers generally consist of an absorbent central portion having a front portion forming a belt with two front ear portions and a rear portion forming a belt with two rear ear portions at both ends thereof, by which the diaper can be fixed to the wearer of the disposable diaper. Each rear ear portion is generally provided with a holding device (e.g., a hook), and this holding device cooperates with an application area arranged on the front belt. This application area is generally referred to as a "comfort strip" in the field of hygiene or is identified by the expression "landing zone".

[0004] In France, 3.5 billion disposable diapers are consumed every year.

[0005] Disposable diapers take hundreds of years to decompose naturally in landfill sites.

[0006] Incineration is an inefficient method considering the amount of liquid that has to be evaporated.

[0007] Recycling can be a viable solution to avoid wasting materials extracted from the environment, but recycling is also complex. It is necessary to remove urine and feces from used disposable diapers, and then separate and sort the various materials constituting the diapers.

[0008] Composting can be a viable solution. In fact, used disposable diapers contain approximately 75% biodegradable material (urine, feces, cellulose). However, the diaper retaining devices, front strips, and chassis are generally made from polypropylene, which is not compostable.

[0009] Furthermore, the global shortage of raw materials has led to the rationalization of raw material production, resulting in shortages of very specific materials in many areas, particularly in the manufacture of small products of a few millimeters or less, such as hooks for holding devices.

[0010] Therefore, the ongoing need for retention devices and the rationalization of materials available on the market necessitate finding solutions to continue manufacturing retention devices without incurring significant cost increases, while taking into account substantial increases in energy and raw material costs, as well as existing manufacturing methods.

[0011] Furthermore, materials available on the market are increasingly derived from external or internal recycling routes, such as pre-consumer and / or post-consumer materials. These materials are often degraded or severely degraded and therefore cannot be directly used in the manufacture of holding devices. The availability of such materials also creates a need to improve their quality. [Overview of the Initiative] [Problems that the invention aims to solve]

[0012] This disclosure aims to overcome at least some of these shortcomings. [Means for solving the problem]

[0013] For this purpose, this disclosure relates to a retaining device. This retaining device is - A base portion that extends in the longitudinal direction and has an upper surface and a lower surface, - Multiple retaining elements extending from the upper surface of the base, each having a rod, Equipped with, The holding device is formed from a first thermoplastic material and a second material, primarily having a flexural modulus of 200 MPa to 4500 MPa, measured in mass percentage, particularly in accordance with the ISO 178:2019 standard. The second ingredient is, - A second thermoplastic material having a flexural modulus that is at least 10% and / or at least 100 MPa different from the flexural modulus of a first thermoplastic material, - Non-thermoplastic materials present in a content strictly greater than 1% by mass of the total composition of the holding device, particularly 1.1% by mass or more, and especially 1.2% by mass or more, - Mineral fillers and / or plant fillers whose content is 30% by mass or less of the total composition of the holding device, - These combinations, It is selected from the group consisting of the following.

[0014] Depending on the composition of the holding device, it can be composted in an industrial environment according to, for example, EN 13432:2000, or be based on compostable materials, and / or be biomass-derived according to, for example, EN 16785-1:2016 and ASTM D 6866:2022, and furthermore, at the end of its lifespan, it can be processed through at least one of an industrial composting route and a recycling route.

[0015] Depending on the composition of the holding device, the holding device can be made from recycled materials such as pre-consumer materials and / or post-consumer materials.

[0016] Depending on the composition of the retaining device, it is possible to continue manufacturing the retaining element without fundamentally changing at least one of the current manufacturing lines for such retaining devices and / or the manufacturing methods for such retaining devices, and / or to obtain a retaining device having performance at least equivalent to or better than that of the prior art.

[0017] Surprisingly, due to the composition of the holding device, it has a molding temperature range acceptable in at least one of the current production lines and the current production methods of such holding devices, while being easy to mold, especially at least one of mold molding, demolding, and calendering is easy, and / or it is possible to obtain a preform for forming the holding device.

[0018] As is generally understood, the mass percentage of the first thermoplastic material is greater than the mass percentage of each material constituting the second material.

[0019] As a non-limiting example, the mass percentage of the first thermoplastic material can be 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more based on the total mass of the holding device.

[0020] According to Section 2.1177 of EN ISO 472:2013 standard, a thermoplastic material is a material that can be repeatedly softened by heating and can be hardened by cooling within a characteristic temperature range of this plastic material, and can be shaped by plasticity, extrusion, or forming in a mold in the softened state.

[0021] It is understood that the first thermoplastic material and / or the second thermoplastic material are materials having thermoplastic behavior. However, these thermoplastic materials can contain non-thermoplastic materials in an amount such that the behavior of the material remains thermoplastic behavior.

[0022] Mineral fillers and / or vegetable fillers are relatively inert solid materials, and are added especially to modify at least one of the resistance of the material, especially the formability of the material, the stability of the material, and the processing characteristics (e.g., molding) of the material, and / or to reduce the manufacturing cost.

[0023] As a non-limiting example, the filler can be in the form of powder or fiber.

[0024] The content of the mineral filler and / or the plant filler can be 0.5% by mass or more, particularly 1% by mass or more, 2% by mass or more, 5% by mass or more of the total composition of the holding device, and / or can be 25% by mass or less, particularly 20% by mass or less of the total composition of the holding device.

[0025] In some embodiments, the first thermoplastic material can have a flexural modulus of 800 MPa or more, particularly greater than 1200 MPa, particularly greater than 1800 MPa, and / or can have a flexural modulus of 4000 MPa or less, particularly less than 3000 MPa, particularly less than 2400 MPa. Therefore, the effects of the present invention, particularly recycling, can be more effectively exerted within these ranges.

[0026] In some embodiments, the first thermoplastic material can have a flexural modulus of 800 MPa or more, particularly greater than 1000 MPa, particularly greater than 1200 MPa, and / or can have a flexural modulus of 4000 MPa or less, particularly less than 3000 MPa, particularly less than 2400 MPa. Therefore, the effects of the present invention, particularly recycling, can be more effectively exerted within these ranges.

[0027] In some embodiments, the second thermoplastic material can have a flexural modulus of 800 MPa or more, particularly greater than 1200 MPa, particularly greater than 1500 MPa, and / or can have a flexural modulus of 4000 MPa or less, particularly less than 3000 MPa, particularly less than 2500 MPa, and more particularly less than 2000 MPa. Therefore, the effects of the present invention, particularly recycling, can be more effectively exerted within these ranges, and the gripping performance with the loop corresponding portion is improved.

[0028] In some embodiments, the flexural modulus of the first thermoplastic material can be made greater than that of the second thermoplastic material. This allows the effects of the present invention to be more effectively demonstrated within these ranges, improving the gripping performance with the loop-corresponding portion. In some embodiments, the flexural modulus of the first thermoplastic material can be made less than that of the second thermoplastic material. Therefore, the resulting holding device has the advantage of being even more economical.

[0029] In some embodiments, the first thermoplastic material may have a number-average molecular weight of 20,000 g / mol or more.

[0030] The number-average molecular weight can be measured by high-temperature SEC (an acronym for "Size Exclusion Chromatography").

[0031] In some embodiments, the non-thermoplastic material may include at least one of a plasticizer, a flow promoter, a lubricant, and a stabilizer.

[0032] In some embodiments, the non-thermoplastic material may include at least one of a molding agent, a mold release agent, and a processing aid.

[0033] Plasticizers are compounds that reduce the softening range of a material, making it easier to mold.

[0034] Flow accelerators are compounds that reduce the viscosity of a material.

[0035] A lubricant is a compound that reduces friction between a material itself or a surface it comes into contact with during the processing of that material (e.g., molding).

[0036] Stabilizers are compounds that enhance the stability of materials over time and / or in various environments.

[0037] In some embodiments, a non-thermoplastic material can simultaneously have several effects, such as the effect of at least one of a plasticizer, a flow promoter, a lubricant, and a processing aid.

[0038] In some embodiments, the second material may include a non-thermoplastic material having a molecular weight at least 10% lower than the number-average molecular weight of the first thermoplastic material and / or 15,000 g / mol or less.

[0039] In some embodiments, the second thermoplastic material can simultaneously have several effects, such as the effect of at least one of a plasticizer, a flow promoter, a lubricant, and a processing aid.

[0040] In some embodiments, the first thermoplastic material and / or the second thermoplastic material may have an MFR of 1 g / 10 min or more, for example 2 g / 10 min or more, particularly 10 g / 10 min or more, particularly 15 g / 10 min or more, and / or 300 g / 10 min or less, particularly 200 g / 10 min or less, particularly 170 g / 10 min or less, even more particularly 100 g / 10 min or less, and even more particularly less than 70 g / 10 min. Thus, the effects of the present invention can be more effectively exerted within these ranges, and the material has sufficient fluidity to form the retaining element according to the present invention (i.e., enter the molding cavity) and not merely spread on the surface of the molding tool (outside the molding cavity). This fluidity is particularly sufficient to produce retaining elements with a height of less than 350 microns and / or bases with a thickness of less than 120 micrometers, particularly less than 100 micrometers.

[0041] MFR is the mass melt flow rate of a thermoplastic material, measured according to ISO 1133-1:2022 and / or ISO 1133-2:2011, and is measured at the typical molding temperature of the material under consideration, for example, 230°C / 2.16kg or 190°C / 2.16kg.

[0042] In some embodiments, the second material, in particular the second thermoplastic material, may have an MFR that differs from that of the first thermoplastic material by at least 10%, particularly at least 15%, and / or by at least 5 g / 10 min, particularly at least 10 g / 10 min.

[0043] In some embodiments, the second material may include a non-thermoplastic material. The non-thermoplastic material may be in liquid form, or in an intermediate form between liquid and solid, particularly in wax form, at temperatures of 150°C or less, especially 100°C or less, and especially at room temperature (around 25°C).

[0044] In some embodiments, the non-thermoplastic material is measured at a processing temperature, e.g., molding temperature, according to ASTM D445-21E02, and has a thickness of 700 mm. 2 It can have a viscosity of less than / s (dynamic viscosity).

[0045] The processing temperature, especially the molding temperature, is 80°C or higher, particularly 95°C or higher, and / or 250°C or lower, particularly 225°C or lower, particularly 200°C or lower.

[0046] In some embodiments, the non-thermoplastic material may have a viscosity of 500 mPas·s or less, as measured at the processing temperature, for example, the molding temperature, according to ASTM D445-21E02.

[0047] The processing temperature, especially the molding temperature, is 80°C or higher, particularly 95°C or higher, and / or 250°C or lower, particularly 225°C or lower, particularly 200°C or lower.

[0048] As a non-limiting example, the first thermoplastic material and / or the second thermoplastic material may include at least one of the following thermoplastic materials: - Polyolefins, especially polypropylene (PP) and / or polyethylene (PE) (particularly bio-sourced polyethylene (Bio-PE)), and / or copolymers thereof; - Polyesters, especially polyethylene terephthalate (PET) (e.g., bio-sourced polyethylene terephthalate (Bio-PET)), biodegradable polyesters, polyhydroxyalkanoates (PHA), polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate cobutylene adipate (PBSA), poly(polybutylene succinate) (PES), poly(trimethylene succinate) (PTS), poly(tetramethylene adipate-coterephthalate) (PTAT), polycaprolactone (PCL), and at least one of thermoplastic starch (TPS); - Polyamides (PA) (especially bio-sourced polyamides (Bio-PA)), and / or casein derivatives; - A mixture of two or more of these thermoplastic materials.

[0049] In some embodiments, the holding device may not contain a coloring agent, such as a TiO2-based coloring agent.

[0050] In some embodiments, the second material may contain mineral fillers and / or plant fillers, such as colorants including TiO2-based colorants, in an amount of 1.5% by mass or less, and especially 1% by mass or less.

[0051] In some embodiments, the first thermoplastic material may be a first material based on a first polyolefin material, such as a first polypropylene, and the second material may include a second thermoplastic material, the second thermoplastic material being a second polyolefin material, such as a second polypropylene.

[0052] In some embodiments, the ratio of the mass percentage of the second thermoplastic material to the mass percentage of the first thermoplastic material can be 0.3 or more, particularly 0.45 or more, and / or 0.7 or less, particularly 0.60 or less.

[0053] In some embodiments, the MFR of the first thermoplastic material can be 10 g / 10 min or more, particularly 15 g / 10 min or more, and / or 30 g / 10 min or less, particularly 25 g / 10 min or less.

[0054] In some embodiments, the MFR of the first thermoplastic material can be 25 g / 10 min or more, particularly 35 g / 10 min or more, and / or 45 g / 10 min or less, particularly 40 g / 10 min or less.

[0055] In some embodiments, the MFR of the second thermoplastic material can be 50 g / 10 min or more, particularly 55 g / 10 min or more, and / or 70 g / 10 min or less, particularly 65 g / 10 min or less.

[0056] In some embodiments, the MFR of the second material thermoplastic can be 10 g / 10 min or more, particularly 15 g / 10 min or more, and / or 40 g / 10 min or less, particularly 35 g / 10 min or less.

[0057] In some embodiments, the flexural modulus of the first thermoplastic material can be 1900 MPa or more, particularly 2000 MPa or more, and / or 2500 MPa or less, particularly 2300 MPa or less.

[0058] In some embodiments, the flexural modulus of the first thermoplastic material can be 1300 MPa or more, particularly 1500 MPa or more, and / or 2000 MPa or less, particularly 1900 MPa or less.

[0059] In some embodiments, the flexural modulus of the second thermoplastic material can be 1500 MPa or more, particularly 1700 MPa or more, and / or 2400 MPa or less, particularly 2000 MPa or less, for example strictly 2000 MPa or less.

[0060] In some embodiments, the flexural modulus of the second thermoplastic material can be 1100 MPa or more, particularly 1300 MPa or more, and / or 1800 MPa or less, particularly 1700 MPa or less.

[0061] In some embodiments, the first thermoplastic material may be polyester-based, and the second material may include a non-thermoplastic material present in an amount of 1.5% by mass or more, particularly 2% by mass or more, particularly 5% by mass or more, and / or 25% by mass or less, particularly 20% by mass or less, particularly 18% by mass or less, more precisely 15% by mass or less, and possibly 13% by mass or less, of the total composition of the retaining device.

[0062] In some embodiments, the MFR of the first polyester thermoplastic material can be 10 g / 10 min or more, particularly 20 g / 10 min or more, and / or 50 g / 10 min or less, particularly 40 g / 10 min or less.

[0063] In some embodiments, the non-thermoplastic material may have a molecular weight of 250 g / mol or more, particularly 300 g / mol or more, and / or 19,000 g / mol or less, particularly 15,000 g / mol or less, particularly 10,000 g / mol or less, even more particularly 800 g / mol or less, and possibly 550 g / mol or less.

[0064] In some embodiments, the ratio of the mass percentage of the second material to the mass percentage of the first thermoplastic material can be 0.02 or more, particularly 0.05 or more, particularly 0.1 or more, and / or 0.30 or less, particularly 0.25 or less, particularly 0.24 or less.

[0065] In some embodiments, the non-thermoplastic material can be based on at least one of fatty acid derivatives (e.g., fatty acid esters and / or fatty acid amides), citrates, polyalkylene glycols, and azelaic acid, and in particular can be at least one of oils, waxes, and flakes.

[0066] In some embodiments, the first thermoplastic material may be based on a first polyester, and the second material may include a second thermoplastic material, the second thermoplastic material may be based on a second polyester.

[0067] In some embodiments, the MFR of the first thermoplastic material can be 15 g / 10 min or more, particularly 25 g / 10 min or more, and / or 55 g / 10 min or less, particularly 45 g / 10 min or less.

[0068] In some embodiments, the MFR of the second thermoplastic material can be 25 g / 10 min or less, particularly 15 g / 10 min or less, particularly 10 g / 10 min or less, and / or 0.5 g / 10 min or more.

[0069] In some embodiments, the flexural modulus of the first thermoplastic material can be 1500 MPa or more, particularly 2500 MPa or more, particularly 3000 MPa or more, and / or 4500 MPa or less, particularly 4000 MPa or less.

[0070] In some embodiments, the tensile modulus of the second thermoplastic material can be 2500 MPa or less, particularly 1500 MPa or less, particularly 1200 MPa or less, and possibly 800 MPa or less, and / or 15 MPa or more, particularly 50 MPa or more, and particularly 100 MPa or more.

[0071] The tensile modulus is measured according to ISO 527-1:2019 and / or ISO 527-2:2012.

[0072] In some embodiments, the ratio of the mass percentage of the second thermoplastic material, for example, the second polyester of the second thermoplastic material, to the mass percentage of the first thermoplastic material, for example, the first polyester of the first thermoplastic material, can be 0.20 or more, particularly 0.30 or more, particularly 0.35 or more, and / or 0.70 or less, particularly 0.60 or less, particularly 0.55 or less.

[0073] In some embodiments, the polyester of the first thermoplastic material and the polyester of the second thermoplastic material may have different names. For example, one may be a PLA-based polyester and the other a PBAT-based polyester, or vice versa. Alternatively, for example, one may be based on at least one of PET, Bio-PET, biodegradable polyester, PHA, PLA, PBAT, PBS, PBS A, PES, PTS, PTAT, PCL, and TPS, and the other may be based on a second thermoplastic material selected from this same list and having a different name.

[0074] In some embodiments, the second material may include a non-thermoplastic material present in an amount of 1.5% by mass or more, particularly 2% by mass or more, particularly 4% by mass or more, and / or 15% by mass or less, particularly 12% by mass or less, particularly 10% by mass or less, of the total composition of the holding device.

[0075] In some embodiments, the second material may include mineral fillers and / or plant fillers whose content is 25% by mass or less, particularly 20% by mass or less, and / or 5% by mass or more, particularly 10% by mass or more, particularly 13% by mass or more, of the total composition of the retaining device.

[0076] In some embodiments, the holding device is 200 g / m². 2 The following, in particular, 150g / cm³ 2 The following, in particular, 120g / cm³ 2 It can have the following mass:

[0077] In some embodiments, the retaining element may have a height of 120 μm or more and / or 400 μm or less.

[0078] In some embodiments, the base can have a thickness of 25 μm or more, particularly 40 μm or more, and / or 150 μm or less, particularly 100 μm or less.

[0079] In some embodiments, the rod of the retaining element has a first dimension along the MD direction and a second dimension along the CD direction, and the ratio of the first dimension to the second dimension is greater than 0.7, particularly greater than 0.8, particularly greater than 0.9, and / or less than 1.3, particularly less than 1.2, particularly less than 1.1. Thus, by using such a ratio for the rod of the retaining element, the effects of the present invention are further demonstrated, particularly with respect to grip.

[0080] The thickness of the base is measured between the top and bottom surfaces, in a direction perpendicular to both the top and bottom surfaces. The top surface of the base may be flat or approximately flat. The bottom surface of the base may be flat or approximately flat.

[0081] In some embodiments, each retaining element may comprise a rod with a head at its tip, each rod having a lower end connected to a base and an upper end on the opposite side from which the head extends.

[0082] The head generally extends from the upper end of the rod. The head may have at least one portion extending outward from the upper end of the rod to define a gripping portion or lobe adapted to engage with at least one of the fibers, loops, and complementary retaining elements to produce a self-gripping connection. Thus, the head usually has a maximum cross-section that is strictly larger than the cross-sectional area of ​​the upper end of the rod.

[0083] In some embodiments, the head has a thickness of 20 μm or more, particularly 40 μm or more, and / or 150 μm or less, particularly 70 μm or less, and even more particularly 60 μm or less.

[0084] In some embodiments, the head has a thickness of 120 μm or more, particularly 150 μm or more, and / or 550 μm or less, particularly 500 μm or less, and even more particularly 480 μm or less.

[0085] As a non-limiting example, in a first direction, e.g., the MD direction (an acronym for "Machine Direction"), the rod has a minimum width and the head has a maximum width, and the ratio of the minimum width of the rod to the maximum width of the head is 0.5 or greater, particularly 0.55 or greater, particularly 0.6 or greater, and / or 1.0 or less, particularly 0.95 or less, particularly 0.90 or less.

[0086] As a non-restrictive example, particularly in a second direction perpendicular to the first direction, such as the CD direction (an acronym for "Cross Direction"), the rod has a minimum width and the head has a maximum width, and the ratio of the minimum width of the rod to the maximum width of the head is 0.35 or greater, particularly 0.4 or greater, particularly 0.45 or greater, and / or 1.0 or less, particularly 0.8 or less, particularly 0.70 or less, particularly 0.65 or less.

[0087] As a non-restrictive example, particularly in a second direction perpendicular to the first direction, the rod has a minimum width and the head has a maximum width, and the ratio of the minimum width of the rod to the maximum width of the head is 0.90 or greater, particularly 0.95 or greater, and / or 1.1 or less, particularly 1.05 or less.

[0088] In some embodiments, the rod has a height of 150 μm or more, particularly 200 μm or more, and / or 330 μm or less, particularly 300 μm or less.

[0089] In some embodiments, the ratio of the thickness of the head to the height of the rod is 0.05 or more, particularly 0.1 or more, and / or 0.7 or less, particularly 0.3 or less, and in some cases 0.25 or less.

[0090] In some embodiments, in a first direction, for example, the MD direction, the rod has a proximal portion located on the base side and a distal portion located on the head side, and the width of the rod in the proximal portion can be greater than the width of the rod in the distal portion.

[0091] In some embodiments, particularly in a second direction perpendicular to the first direction, such as the CD direction, the rod has a proximal portion located towards the base and a distal portion located towards the head, and the width of the rod in the proximal portion can be greater than the width of the rod in the distal portion.

[0092] In some embodiments, the retaining element may have at least one plane of symmetry perpendicular to the plane formed by the base and passing through the center of the rod and / or the center of the head.

[0093] In some embodiments, the retaining element may have a single plane of symmetry perpendicular to the plane formed by the base and passing through the center of the rod and / or the center of the head.

[0094] In some embodiments, the retaining element may have at least two planes of symmetry perpendicular to the plane formed by the base and passing through the center of the rod and / or the center of the head, and in particular the two planes of symmetry of the retaining element may be orthogonal to each other.

[0095] In some embodiments, the retaining element can typically be made from a preform (not shown) obtained by molding, particularly by continuous or discontinuous injection molding, or by extrusion molding. This preform includes at least one rod and optionally one head, the upper end of the rod and / or head of the preform being deformed. This deformation is typically carried out by calendering (e.g., hot calendering), for example, in one or two calendering steps.

[0096] In some embodiments, the retaining element can typically be integrally formed with the base, and in particular, the rod and head of the retaining element may be integrally formed with the base. In some embodiments, the material composition of the retaining element and / or the base may be uniformly distributed in each of the retaining element (including the rod and / or head) and / or the base.

[0097] In some embodiments, the first thermoplastic material does not have to include an elastomer material and / or a thermoplastic elastomer, i.e., a material as defined in the ISO 18064 standard of April 2022. In other words, the first thermoplastic material can be a non-elastomer material and / or a non-elastomer thermoplastic material, or an elastomer material and / or an elastomer thermoplastic material that meets the ISO 18064 standard of April 2022. Thus, such features reduce the manufacturing cost of such devices.

[0098] In some embodiments, the second thermoplastic material does not have to include an elastomer material and / or a thermoplastic elastomer, i.e., a material as defined in the ISO 18064 standard of April 2022. In other words, the second thermoplastic material can be a non-elastomer material and / or a non-elastomer thermoplastic material, or an elastomer material and / or an elastomer thermoplastic material that meets the ISO 18064 standard of April 2022. Thus, such features reduce the manufacturing cost of such devices.

[0099] In some embodiments, the retaining device is manufactured by extruding a material, thereby forming an extruded retaining device. Such a retaining device has an MD direction and a CD direction that crosses the MD direction.

[0100] In some embodiments, each retaining element includes a rod, which can be manufactured by molding. That is, the rod is manufactured directly by extrusion or has a surface manufactured directly by extrusion and at least one calendering step for forming (or deforming) a head. In other words, the rod does not include cutting and / or stretching steps, which are steps that may weaken the product and, in particular, may cause a “spiral break” in which the retaining device easily breaks during winding and / or unwinding. In some cases, the rod may have two opposing flat surfaces, in particular two opposing flat surfaces perpendicular to the MD direction and / or CD direction.

[0101] In some embodiments, the retaining element and the base may consist of the first thermoplastic material and the second material, in terms of mass percentage, primarily comprising and being formed from the first thermoplastic material and the second material.

[0102] In some embodiments, the rod and head of the retaining element, as well as the base, may consist primarily of the first thermoplastic material and the second material, in terms of mass percentage, and in particular, the rod and head of the retaining element, as well as the base, may be made of these materials in such a way that they are formed from the first thermoplastic material and the second material.

[0103] In some embodiments, the retaining elements can be arranged in rows and columns, which may be aligned or staggered. More specifically, each retaining element may be arranged to align in the lateral direction CD and / or the machine direction MD, or it may be offset to form a staggered or honeycomb pattern. In this case, two consecutive rows or two consecutive columns are offset by a pitch in the lateral and / or machine direction, respectively, corresponding to half the lateral spacing and / or half the machine direction spacing.

[0104] In some embodiments, each retaining element may have a head thickness which is the distance between the upper end of the rod and the upper end of the retaining element, measured perpendicular to the base.

[0105] In some embodiments, each retaining element may have a grip height which is the distance between the lower end and the upper end of the head, measured perpendicular to the base, and the grip height of the head is greater than or equal to the thickness of the head.

[0106] In some embodiments, the retaining element can have an engagement height (hook height) of typically 30 μm or more, particularly 40 μm or more, and / or 120 μm or less, particularly 70 μm or less, particularly 60 μm or less.

[0107] In some embodiments, the retaining element can have an engagement height (hook height) of typically 150 μm or more, particularly 200 μm or more, and / or 650 μm or less, particularly 550 μm or less, particularly 500 μm or less, particularly 370 μm or less.

[0108] In some embodiments, the retaining element can typically be adapted or formed so that the retaining device cooperates with the loop to achieve contact closure.

[0109] Generally speaking, two types of self-gripping connections can be distinguished: one in which a retaining element cooperates with other retaining elements of the same type / properties, i.e., creating a mechanical connection in at least one form of fiber, filament, and loop; and another in which a retaining element cooperates with a surface to create an adhesive connection (Gecko type), i.e., a connection utilizing van der Waals forces. This second type of connection can sometimes be considered a so-called self-gripping connection, but such retaining elements that utilize van der Waals forces have entirely different behaviors and characteristics from retaining elements that utilize mechanical connections. In fact, in the case of retaining elements that utilize van der Waals forces, only the top surface of the head is responsible for adhesion to the receiving surface, whereas in the case of retaining elements for mechanical attachment, adhesion is performed not by the top surface of the head, but by the bottom surface of the head and the rod. For example, the retaining device according to the present invention is suitable only for applications that provide mechanical connections.

[0110] In some embodiments, the holding device is 1 cm 2 The elements may include numbers that are 10 or greater, especially 50 or greater, especially 125 or greater, especially 200 or greater, and / or 700 or less, especially 550 or less, especially 450 or less, and possibly 315 or less.

[0111] In some embodiments, the retaining device may have a peel strength of 2N or more, particularly 3N or more, which is measured according to the methods described in the remainder of this specification.

[0112] (Method for measuring peel resistance)

[0113] To measure the peeling performance against overfeeding, the 180° open-circuit resistance of assembled comfort hook / strip pairs is measured. For example, 80 g / m 2A strip of hooks, 15 mm wide and 25.4 mm long, assembled on a paper support (25.4 mm wide), is pressed onto a 50 mm x 50 mm comfort strip sample using a single 2 kg roller. At this time, the relative orientation of the product is the same as that used in diapers. Then, to simulate the closing of a diaper, especially one with elastic ears, a 1 kg tensile force is applied to the hook support for 10 seconds. Next, the paper supporting the hooks is inserted into the movable upper jaw of a traction frame, for example, a 1 / M type traction frame from MTS Systems equipped with a 100 N load cell, and the comfort strip is inserted into the lower jaw. The distance between the two chucks is 50 mm. Next, to measure the release force, the top of the frame is moved parallel from bottom to top at a speed of 305 mm / min. Then, the maximum force output by the machine is recorded, and, if necessary, the energy value corresponding to the area under the surface of the test curve obtained during the first 13 mm movement of the tension frame is recorded. If the product width differs from 15 mm, the obtained values ​​are recalculated to be proportional to 15 mm.

[0114] In some embodiments, the holding device may have a shear strength of 35 N or more, particularly 45 N or more, which is measured according to the methods described in the remainder of this specification.

[0115] (Method for measuring shear strength)

[0116] To measure the shear performance against overfeeding, a 50mm x 50mm comfort strip sample is taken and bonded to a rigid plate, such as a metal rigid plate, using double-sided adhesive tape.

[0117] For example, 250g / m 2The operator inserts a 15mm wide, 25.4mm long strip of hooks, assembled on a paper support, into the comfort strip, taking into account its relative orientation on the product layer, and applies pressure with their thumb for 3 seconds.

[0118] Next, to simulate the closing of a diaper, particularly one with elastic ear loops, a tensile force of 1 kg is applied to the hook support for 5 seconds.

[0119] The metal plate supporting the comfort strip is inserted into the movable upper chuck of a 1 / M type tension frame manufactured by MTS Systems, for example, equipped with a 100N load cell.

[0120] Next, insert the paper supporting the hook into the fixed lower chuck.

[0121] The direction of frame movement is the same as the direction of a 1kg tensile force. The distance between the two chucks is 76mm. Next, to measure the release force, the top of the frame is moved parallel to the top at a constant speed of 305mm / min. The test is carried out until the loop and hook engagement is completely disengaged. The maximum force value is then recorded on the resulting curve. If the width of the product differs from 15mm, the obtained value is recalculated to be proportional to 15mm.

[0122] This disclosure also relates to a laminated assembly comprising the retaining device and nonwoven web as defined above.

[0123] As a non-limiting example, nonwoven webs can be manufactured using dry-laid, wet-laid, or spun-laid (melt / extrusion process) techniques and consolidated by mechanical, thermal, chemical, and / or adhesive bonding.

[0124] For example, the web is made from a solidified cardraid nonwoven fabric, particularly a spunlace nonwoven fabric, which is solidified by hydrobonding.

[0125] Nonwoven webs can be made from a variety of synthetic and / or natural materials. Exemplary natural materials include cellulose fibers such as cotton, jute, and linen, and may also include regenerated cellulose fibers such as rayon or viscose. Natural fibers for nonwoven materials can be processed using various methods, such as carding. Exemplary synthetic materials include, but are not limited to, synthetic plastic polymers known to form fibers, including polyolefins such as polyethylene, polypropylene, and polybutylene; polyamides such as polyamide 6, polyamide 6.6, polyamide 10, and polyamide 12; polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polylactic acid; polycarbonates; polystyrene; thermoplastic elastomers; vinyl polymers; polyurethanes; and mixtures and copolymers thereof. For example, the nonwoven may be spunbond, spunmelt, carded, SMS, SMMS, SS, SSS, SSMMS, SSMMMS, air-through, or other types of nonwovens. For example, the nonwoven fabric may include various combinations of spunbond "S" layers and meltblown "M" layers. These examples are not intended to be limiting.

[0126] This disclosure also relates to a method for manufacturing the holding device as defined above. This method is - A step of providing a first thermoplastic material and a second material having a flexural modulus of 200 MPa or more and 4500 MPa or less, The second ingredient is, - A second thermoplastic material having a flexural modulus that is at least 10% and / or at least 100 MPa different from that of the first thermoplastic material, - Non-thermoplastic materials present in a content strictly greater than 1 mass% of the total composition of the holding device, - Mineral fillers and / or plant fillers whose content is 30% by mass or less of the total composition of the holding device, - These combinations, The steps include providing a first thermoplastic material and a second material selected from the group consisting of, - A step of mixing a first thermoplastic material and a second material, - The step of forming a holding device from a mixture of a first thermoplastic material and a second material, Includes.

[0127] In some embodiments, the step of mixing the first thermoplastic material and the second material is performed inline, for example, in an extruder and / or in a dosing device located at the inlet of the extruder.

[0128] In some embodiments, this method involves, after the step of mixing a first thermoplastic material and a second material, - A step of packaging a mixture of the first thermoplastic material and the second material for transport, - The steps of unpacking a mixture of the first thermoplastic material and the second material to form a holding device, Includes.

[0129] In some embodiments, the step of forming a retaining device includes a substep of deforming a preform of a retaining element.

[0130] This disclosure further relates to absorbent articles such as baby diapers and adult diapers. The absorbent article includes an upper sheet, a lower sheet, an absorbent core positioned between the two sheets, the upper sheet and the lower sheet, and at least one retaining device as defined above.

[0131] In some embodiments, the absorbent article comprises at least complementary retaining elements. These complementary retaining elements are arranged and configured to cooperate with retaining elements of a retaining device to achieve closure of the absorbent article and / or assembly of one or more subassemblies of the absorbent article, particularly temporary assembly.

[0132] Other features and advantages of the purposes of this disclosure will become apparent from the following description of embodiments shown as non-limiting examples, with reference to the accompanying drawings. [Brief explanation of the drawing]

[0133] [Figure 1] This is a schematic cross-sectional view of a molding apparatus for forming a holding device. [Figure 2] This is a flowchart showing the steps in the manufacturing method of a holding device. [Figure 3] This is a schematic perspective view of the retaining element according to the first embodiment. [Figure 4] This is a schematic perspective view of the retaining element according to the second embodiment. [Modes for carrying out the invention]

[0134] The present invention will be explained by examples (Examples 1 to 6) and comparative examples (Comparative Examples 1 to 4).

[0135] (Example 1)

[0136] Example 1 is a mixture of two types of polypropylene and a mineral filler.

[0137] The first thermoplastic material is a first polypropylene with an MFR (230°C / 2.16kg) of 20g / 10min and a flexural modulus of 2200MPa.

[0138] The second material is a mixture of a second thermoplastic material, namely a second polypropylene with an MFR (230°C / 2.16kg) of 60g / 10min and a flexural modulus of 1800MPa, and a mineral filler, namely a TiO2-based colorant.

[0139] The mass composition is 64.2% of the first polypropylene, 35% of the second polypropylene, and 0.8% of the colorant.

[0140] (Example 2)

[0141] Example 2 is a mixture of two types of polypropylene and a mineral filler.

[0142] The first thermoplastic material is a first polypropylene with an MFR (230°C / 2.16kg) of 40g / 10min and a flexural modulus of 1700MPa.

[0143] The second material is a mixture of a second thermoplastic material, namely a second polypropylene with an MFR (230°C / 2.16kg) of 25g / 10min and a flexural modulus of 1500MPa, and a mineral filler, namely a TiO2-based colorant.

[0144] The mass composition is 65% first polypropylene, 34% second polypropylene, and 1% colorant.

[0145] (Example 3)

[0146] Example 3 is a mixture of PLA and a plasticizer.

[0147] The first thermoplastic material is PLA with an MFR (190°C / 2.16kg) of 30g / 10min and a flexural modulus of 3400MPa.

[0148] The second material is a non-thermoplastic material, specifically a plasticizer based on citrate ester with a molecular weight of less than 600 g / mol. The plasticizer further possesses lubricating and flow-promoting effects.

[0149] The mass composition is 85% to 90% PLA and 10% to 15% plasticizer.

[0150] (Example 4)

[0151] Example 4 is a mixture of PLA and a plasticizer.

[0152] The first thermoplastic material is PLA with an MFR (190°C / 2.16kg) of 30g / 10min and a flexural modulus of 3400MPa.

[0153] The second material is a non-thermoplastic material, specifically a plasticizer based on citrate ester with a molecular weight of less than 600 g / mol. The plasticizer further possesses lubricating and flow-promoting effects.

[0154] The mass composition is 80% to 85% PLA and 15% to 20% plasticizer.

[0155] (Example 5)

[0156] Example 5 is a mixture of PLA and a plasticizer.

[0157] The first thermoplastic material is PLA with an MFR (190°C / 2.16kg) of 35g / 10min, a flexural modulus of 3600MPa, and a number-average molecular weight of approximately 44000g / mol.

[0158] The second material is a mixture of the second thermoplastic material, a non-thermoplastic material, and a mineral filler.

[0159] The second thermoplastic material is a mixture of PLA and PBAT with an MFR (190°C / 2.16kg) of 3-5g / 10min and a tensile modulus of 185-420MPa.

[0160] The non-thermoplastic material is a mixture of a lubricant and a flow accelerator, each having a molecular weight of 1100 g / mol or less. For example, the lubricant includes a processing aid and a slip agent, the slip agent being particularly based on fatty acid derivatives, such as fatty acid amides.

[0161] The mineral filler is talc.

[0162] The mass composition is 52% (±2%) of PLA, 23% (±2%) of a second thermoplastic material, approximately 2.5% of lubricant, approximately 6% of flow enhancer, and approximately 16% of talc.

[0163] (Comparative Example 1)

[0164] Comparative Example 1 is made of polypropylene with an MFR (230℃ / 2.16kg) of 35g / 10min and a flexural modulus of 1600MPa.

[0165] (Comparative Example 2)

[0166] Comparative Example 2 is made of polypropylene with an MFR (230℃ / 2.16kg) of 100g / 10min and a flexural modulus of 1500MPa.

[0167] (Comparative Example 3)

[0168] Comparative Example 3 consists of PLA with an MFR (190℃ / 2.16kg) of 30g / 10min and a flexural modulus of 3400MPa.

[0169] (Example 6)

[0170] Example 6 is a mixture of two types of polypropylene and a mineral filler.

[0171] The first thermoplastic material is a first polypropylene with an MFR (230°C / 2.16kg) of 35g / 10min and a flexural modulus of 1210MPa.

[0172] The second material is a mixture of a second thermoplastic material, namely a second polypropylene with an MFR (230°C / 2.16kg) of 60g / 10min and a flexural modulus of 1800MPa, and a mineral filler, namely a TiO2-based colorant.

[0173] The mass composition is 79.2% of the first polypropylene, 20% of the second polypropylene, and 0.8% of a TiO2-based colorant.

[0174] (Comparative Example 4)

[0175] Comparative Example 4 is made of polypropylene with an MFR (230℃ / 2.16kg) of 35g / 10min and a flexural modulus of 1210MPa.

[0176] <Formation of a holding device>

[0177] Figure 1 shows a schematic cross-sectional view of a molding apparatus 10 for forming a retaining device. The molding apparatus 10 includes an endless (closed on itself) molding strip 12, which has an inner surface 14, an outer surface 16, and a plurality of through cavities 18 extending from the outer surface 16 to the inner surface 14.

[0178] The molding strip 12 is stretched over means for rotating the molding strip 12, such as two rotary drive rollers 20, 22. One of the rotary drive rollers 20 of the molding strip 12 may function as a molding support 24.

[0179] The molding support 24 includes a molding surface 26 intended to contact the inner surface 14 of the molding strip 12. The inner surface 14 of the molding strip 12 contacts the rotational drive roller 20 of the molding strip 12.

[0180] The molding apparatus 10 further includes a device 28 for supplying (distributing) plastic material 30 into the cavity 18 of the molding strip 12. In Figure 1, the device 28 for supplying material such as plastic material 30 (i.e., a mixture of the first thermoplastic material and the second material) is located on the outer surface 16 side of the molding strip 12 (opposite the molding support 26). That is, the plastic material 30 is supplied into the cavity 18 of the molding strip when the inner surface 14 of the molding strip 12 is in contact with the molding surface 26 of the molding support 24.

[0181] For example, the supply device 28 can be a head for injecting plastic material. The head for injecting plastic material has an opening whose lateral width is less than or equal to the lateral width of the molding strip 12.

[0182] In Figure 1, the supply device 28 is positioned at a certain distance from the outer surface 16 of the molding strip 12 so as to form a gap 32 between the molding strip 12 and the supply device 28.

[0183] When the plastic material 30 is supplied into the cavity 18 of the molding strip 12, the base 34 is also formed on the outer surface 16 of the molding strip 12. As a result, when the base 34 is removed from the mold, a ribbon 36 is formed, which includes a base 34 with multiple retaining elements 38 or multiple retaining element preforms formed on it.

[0184] The molding apparatus 10 also includes a release roller 40. The release roller 40 can be configured to separate the base 34 of the ribbon 36 from the molding strip 12, for example, by the action of the tension of the ribbon 36 and the change in its direction of travel. The release roller 40 may be a suction roller or may have a rubber coating.

[0185] It should be noted that the molding apparatus 10 may include a device for removing excess plastic material, such as a scraper 42. In the example in Figure 1, the scraper 42 is located on the inner surface 14 side of the molding strip 12 and downstream of the molding support 24 in the direction of movement of the molding strip 12. Therefore, it is understood that the scraper 42 is located downstream of the supply device 28.

[0186] Compositions for Examples 1-5 and Comparative Examples 1-3 were prepared, and holding devices were formed in the molding apparatus 10.

[0187] It is understood that the molding apparatus 10 is provided as an example. Other apparatus may be used to form the retaining devices from the compositions of Examples 1-5 and Comparative Examples 1-3.

[0188] As a non-limiting example, Figure 2 shows a method for manufacturing a holding device 100. This method 100 includes the steps of: providing a first thermoplastic material 110 and a second material 120; mixing the first thermoplastic material 110 and the second material 120 140; and forming a holding device from the mixture of the first thermoplastic material and the second material 150.

[0189] The mixture of the first thermoplastic material and the second material is shown in Figure 1 as the plastic material 30 coming out of the supply device 28.

[0190] Between the mixing step 140 and the forming step 150, the mixture can be conditioned (160) to transport the mixture of the first thermoplastic material and the second material. After the mixture of the first thermoplastic material and the second material reaches its destination, the mixture can be unconditioned (170) and the forming step 150 can be carried out.

[0191] Alternatively, the mixing of the first thermoplastic material and the second material may be performed in-line. That is, the step 130 of supplying the first thermoplastic material 110 and the second material 120, and the step 140 of mixing the first thermoplastic material 110 and the second material 120, can be performed, for example, in equipment directly connected to the supply device 28.

[0192] Figures 3 and 4 are partial perspective views of the two holding devices 50.

[0193] In Figures 3 and 4, common elements are identified by the same reference numerals.

[0194] Furthermore, the MD and CD directions are also shown as non-limiting examples.

[0195] The holding device 50 comprises a base 52 having an upper and lower surface, and a plurality of holding elements 54 extending from the upper surface of the base 52. Figures 3 and 4 show a single holding element 54.

[0196] The retaining element comprises a rod 56 extending from the upper surface of the base 52 and having a head 58 at its tip. The rod includes a lower end connected to the base 52 and an upper end on the opposite side from which the head 58 extends.

[0197] The head 58 may have at least one portion extending outward from the upper end of the rod. This portion is for defining a gripping portion or lobe adapted to engage with fibers and / or loops and / or complementary retaining elements to produce a self-gripping connection. Thus, the head 58 typically has a maximum cross-section that is strictly larger than the cross-sectional area of ​​the upper end of the rod 56.

[0198] The thickness and height are measured in a direction perpendicular to the top and / or bottom surface of the base, for example, perpendicular to the plane formed by the MD and CD directions, and the width is measured in a plane parallel to the top and / or bottom surface, for example, parallel to the plane formed by the MD and CD directions.

[0199] The base 52 has a thickness E52 measured between the upper and lower surfaces of the base 52, the retaining element 54 has a height H54, the rod 56 has a height H56 and a width L56, and the head has a thickness E58 and two widths L58 and l58. The width L58 is the maximum width of the head 58.

[0200] The engagement height (hook height) Ha is shown in Figure 4.

[0201] Table 1 shows the results of measurements of peel strength and shear strength for hook-type retaining devices. The peel strength and shear strength values ​​are reported for retaining devices with a width of 15 mm.

[0202] [Table 1]

[0203] The peel strength and shear strength values ​​for Comparative Example 3 could not be measured. This is because this material, namely injection-molded grade PLA, cannot be molded on its own. The molding of the retaining device was partial, and the molding cavity was not completely filled due to the high viscosity of the material. In this case, raising the molding temperature to fluidize the material is not possible due to the heat sensitivity of the compostable material. Furthermore, due to the high flexural modulus, demolding of the retaining element and / or preform is extremely difficult, leading to breakage of the retaining element or excessive deformation of the rod. Therefore, it is impossible to obtain satisfactory retaining elements and / or preforms, especially in the manufacture of retaining elements with a height of less than 350 microns and / or retaining elements with a thickness of less than 120 micrometers, particularly those with a base of less than 100 micrometers.

[0204] The peel strength and shear strength values ​​for Comparative Example 4 could not be measured. This is because this material, which contains only polypropylene, cannot be molded. The molding of the retaining device is partial, and the molding cavity is not completely filled due to the high viscosity of the material. Therefore, it is impossible to obtain satisfactory retaining elements and / or preforms, especially in the manufacture of retaining elements with a height of less than 350 microns and / or retaining elements with a thickness of less than 120 micrometers, particularly a base thickness of less than 100 micrometers.

[0205] Compare the values ​​of Examples 1, 2, and 6 with the values ​​of Comparative Examples 1, 2, and 4. Compare the values ​​of Examples 3 to 5 with the values ​​of Comparative Example 3. More specifically, compare the value of Example 1 with the value of Comparative Example 1. Compare the value of Example 6 with the value of Comparative Example 4.

[0206] For Examples 1 and 2, and Comparative Examples 1 and 2, peel strength and shear strength were measured for a holding device with a width of 15 mm.

[0207] In Example 3, peel strength and shear strength were measured for a holding device with a width of 19 mm. The peel strength was 3.6 ± 1.5 N, which is equivalent to 2.8 ± 1.2 N for a width of 15 mm. The shear strength was 76 ± 20 N, which is equivalent to 60 ± 16 N for a width of 15 mm.

[0208] For Example 4, peel strength and shear strength were measured for a holding device with a width of 19 mm. The peel strength value was 2.6 ± 1.2 N, which is equivalent to 2.1 ± 1.0 N when converted to a value for a width of 15 mm. The shear strength value was 60 ± 20 N, which is equivalent to 47 ± 16 N when converted to a value for a width of 15 mm.

[0209] In Example 5, peel strength and shear strength were measured for a holding device with a width of 22 mm. The peel strength value was 3.2 ± 1.4 N, which is equivalent to 2.2 ± 1.0 N for a width of 15 mm. The shear strength value was 93 ± 13 N, which is equivalent to 63 ± 9 N for a width of 15 mm.

[0210] As can be seen from the above, the peel strength values ​​of Examples 1, 2, and 6 are the same as or even higher than the values ​​of Comparative Examples 1, 2, and 4. The same applies to the shear strength values.

[0211] It should be noted that Examples 3 to 5 should be compared with Comparative Example 3. However, although the peel strength values ​​of Examples 3 to 5 are lower than those of Comparative Examples 1 and 2, they are satisfactory for their intended applications. The shear strength values ​​are lower than or equivalent to those of Comparative Examples 1 and 2.

[0212] According to Examples 1 to 6, satisfactory holding devices can be obtained. That is, these holding devices are compostable in an industrial environment or based on compostable materials, for example, according to the EN 13432:2000 standard, and / or are biomass-derived according to at least one of the EN 16785-1:2016 standard and ASTM D 6866:2022 standard, and / or at the end of their lifespan, at least one of an industrial composting route and a recycling route can always be considered.

[0213] By comparing Example 6 with Comparative Example 4, it can be confirmed that the average performance of the retaining elements (average peel and / or average shear) has improved. At the same time, the economic benefits may also improve, which is achieved, in particular, by avoiding a single, demanding, and highly specialized source of material, and further by using (selecting) a wide range of less specific or less demanding first and second materials as defined above.

[0214] While this disclosure has been described with reference to specific exemplary embodiments, it is evident that various modifications and changes can be made to these embodiments without departing from the general scope of the invention as defined by the claims. Furthermore, individual features of the various embodiments described above can be combined in additional embodiments. Therefore, this description and drawings should be considered illustrative rather than restrictive.

Claims

1. A holding device (50), A base portion (52) extending in the longitudinal direction and having an upper surface and a lower surface, A plurality of retaining elements (54) extending from the upper surface of the base (52), each having a rod (56), Equipped with, The holding device (50) is formed from a first thermoplastic material having a flexural modulus of 200 MPa or more and 4500 MPa or less, measured in mass percent, particularly in accordance with ISO 178:2019 standard, and a second material. The second material described above is - A second thermoplastic material having a flexural modulus that is at least 10% and / or at least 100 MPa different from the flexural modulus of the first thermoplastic material, - A non-thermoplastic material present in a content that is strictly greater than 1% by mass of the total composition of the holding device, particularly 1.1% by mass or more, and particularly 1.2% by mass or more, - A plant-based filler whose content is 30% by mass or less of the total composition of the holding device, - These combinations, Selected from the group consisting of, Holding device (50).

2. The holding device (50) according to claim 1, wherein the first thermoplastic material has a flexural modulus of 800 MPa or more and 4000 MPa or less.

3. The first thermoplastic material has a number average molecular weight of 20,000 g / mol or more, as described in the holding device (50) according to claim 1 or claim 2.

4. The holding device (50) according to claim 3, wherein the second material comprises a non-thermoplastic material having a molecular weight at least 10% lower than the number average molecular weight of the first thermoplastic material and / or 15,000 g / mol or less.

5. The holding device (50) according to any one of claims 1 to 4, wherein the first thermoplastic material has an MFR of 1 g / 10 min or more, particularly 10 g / 10 min or more, particularly 15 g / 10 min or more, and / or 300 g / 10 min or less, particularly 200 g / 10 min or less, particularly 170 g / 10 min or less.

6. The holding device (50) according to claim 5, wherein the second material, in particular the second thermoplastic material, has an MFR that is at least 10% and / or at least 5 g / 10 min different from the MFR of the first thermoplastic material.

7. The non-thermoplastic material has a molecular weight of 250 g / mol or more, particularly 300 g / mol or more, and / or 19,000 g / mol or less, particularly 15,000 g / mol or less, particularly 10,000 g / mol or less, even more particularly 800 g / mol or less, and in some cases 550 g / mol or less, according to any one of claims 1 to 6, the holding device (50).

8. A retaining device (50) according to any one of claims 1 to 7, wherein the first thermoplastic material is polyester-based, and the second material comprises a non-thermoplastic material present in an amount of 1.5% by mass or more, particularly 2% by mass or more, particularly 5% by mass or more, and / or less than 2% by mass or equal to 5% by mass of the total composition of the retaining device, particularly 20% by mass or less, particularly 18% by mass or less, more precisely 15% by mass or less, and in some cases 13% by mass or less of the total composition of the retaining device.

9. The holding device (50) according to any one of claims 1 to 8, wherein the ratio of the mass percentage of the second material to the mass percentage of the first thermoplastic material is 0.02 or more, particularly 0.05 or more, particularly 0.1 or more, and / or 0.30 or less, particularly 0.25 or less, particularly 0.24 or less.

10. The holding device (50) according to any one of claims 1 to 9, wherein the first thermoplastic material is a first material based on a first polyolefin material, for example, a first polypropylene, and the second material includes the second thermoplastic material, the second thermoplastic material being a second polyolefin material, for example, a second polypropylene.

11. The holding device (50) according to claim 10, wherein the ratio of the mass percentage of the second material to the mass percentage of the first thermoplastic material may be 0.3 or more, particularly 0.45 or more, and / or 0.7 or less, particularly 0.60 or less.

12. A holding device (50) according to any one of claims 1 to 9, wherein the first thermoplastic material is based on a first polyester, and the second material comprises the second thermoplastic material, the second thermoplastic material being based on a second polyester.

13. The ratio of the mass percentage of the second thermoplastic material, for example, the second polyester of the second thermoplastic material, to the mass percentage of the first thermoplastic material, for example, the first polyester of the first thermoplastic material, can be 0.20 or more, particularly 0.30 or more, particularly 0.35 or more, and / or 0.70 or less, particularly 0.60 or less, particularly 0.55 or less, the holding device (50) according to claim 12.

14. Each holding element (54) comprises a rod (56) having a head (58) at its tip, and in a first direction, for example, the MD direction, the rod (56) has a proximal portion located on the base (52) side and a distal portion located on the head (58) side, and the width of the rod at the proximal portion can be made greater than the width of the rod at the distal portion, the holding device (50) according to any one of claims 1 to 13.

15. The holding device (50) according to any one of claims 1 to 14, wherein the second material comprises a mineral filler.

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