CN112304160A - Reduce sunken shellproof picture peg structure - Google Patents

Reduce sunken shellproof picture peg structure Download PDF

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Publication number
CN112304160A
CN112304160A CN202011250457.XA CN202011250457A CN112304160A CN 112304160 A CN112304160 A CN 112304160A CN 202011250457 A CN202011250457 A CN 202011250457A CN 112304160 A CN112304160 A CN 112304160A
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CN
China
Prior art keywords
bulletproof
fiber
layer
composite material
bulletproof fiber
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Pending
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CN202011250457.XA
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Chinese (zh)
Inventor
纪波印
徐永红
丁旭
阮永强
陶锴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Ankey New Material Technology Co ltd
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Jiangsu Ankey New Material Technology Co ltd
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Priority to CN202011250457.XA priority Critical patent/CN112304160A/en
Publication of CN112304160A publication Critical patent/CN112304160A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0414—Layered armour containing ceramic material
    • F41H5/0428—Ceramic layers in combination with additional layers made of fibres, fabrics or plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment
    • B32B2571/02—Protective equipment defensive, e.g. armour plates, anti-ballistic clothing

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

A bulletproof flashboard structure capable of reducing recess is formed by compounding a carbon ceramic sheet and a back plate through an interface adhesive; the back plate is a bulletproof fiber composite material lamination, the bulletproof fiber composite material lamination is formed by folding bulletproof fiber materials together in a single layer, and each layer is compounded through an interface adhesive; the bulletproof fiber material single layer is prepared by coating high-strength fibers arranged in a single orientation by interface adhesive; the back plate is a bulletproof fiber composite material lamination, and breaks through the situation that a plurality of weftless cloth sheets are laminated together in the prior art, the bulletproof fiber composite material lamination is realized by folding a single bulletproof fiber material layer, and the whole back plate is a whole piece of fiber single-layer cloth combined by an adhesive, so that the fiber length is effectively increased, the shearing force between the single bulletproof fiber material layers is increased, the rigidity is improved, blunt injuries are reduced, and depressions are reduced.

Description

Reduce sunken shellproof picture peg structure
Technical Field
The invention relates to the technical field of bulletproof structures, in particular to a bulletproof flashboard structure capable of reducing sag.
Background
The existing bulletproof structure is generally formed by stacking a ceramic panel and a plurality of layers of single bulletproof materials, and each layer of bulletproof material is tightly combined together, thereby playing a bulletproof role. At present, the effective length of the fiber in the fiber back plate in the existing traditional bulletproof flashboard is only the length and the width of the plate, the short fiber structure increases the section layering probability of the back plate, so that the back plate does not have multiple anti-strike capability, after being impacted by bullets, shrapnel and the like at high speed, the generated incident shock wave and the reflected wave generated at the back bullet surface are repeatedly superposed, the back plate has poor anti-sinking effect, and in case of continuous shooting by gangsters, the life safety of a fighter can be seriously threatened;
the backface signature is the depth of the compression set impression left on the backface material in the torso mold after the bullet is stopped by body armor or ballistic inserts. Wherein, the NIJ0101.06 standard of the American society of justice requires that the depth of the back lining depression is less than or equal to 44 mm; the lower the value of the backface signature, the less trauma to the individual and, therefore, the lower the backface signature should be while ensuring penetration resistance of the ballistic material. Therefore, it is highly desirable to develop a bulletproof plate that is light in weight, thin in thickness, and effective in reducing the depth of the undercut of the backing.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a bulletproof flashboard structure with reduced recess, wherein the bulletproof flashboard structure is formed by compounding a carbon ceramic sheet and a back plate through an interface adhesive;
the back plate is a bulletproof fiber composite material lamination, the bulletproof fiber composite material lamination is formed by folding bulletproof fiber materials together in a single layer, and each layer is compounded through an interface adhesive; the bulletproof fiber material single layer is prepared by gluing high-strength fibers arranged in a single orientation by an interface adhesive.
Preferably, the bulletproof gate structure further comprises an outer shell covering the exterior of the bulletproof gate.
Preferably, the bulletproof fiber composite material lamination is formed by folding one end of a bulletproof fiber material single layer towards the other end for multiple times in a clockwise or anticlockwise direction.
Preferably, the bulletproof fiber composite material lamination is formed by folding one end of a bulletproof fiber material single layer to the other end for multiple times in a clockwise direction and a counterclockwise direction in sequence.
Preferably, the high strength fiber is at least one of aramid fiber, ultra-high molecular weight polyethylene fiber, or PBO fiber.
Preferably, the interface adhesive is at least one of a TPU hot melt adhesive film, a PO, a PV, an EVA hot melt adhesive film, an epoxy adhesive, a phenolic resin and a styrene block copolymer elastomer.
Preferably, the back of the bulletproof inserting plate is compounded with a honeycomb structure layer through an interface adhesive, and the honeycomb structure layer is composed of a thermoplastic honeycomb plate and foamed epoxy resin filled in pores of the thermoplastic honeycomb plate.
Has the advantages that: the back plate is a bulletproof fiber composite material lamination, and breaks through the situation that a plurality of weftless cloth sheets are laminated together in the prior art, the bulletproof fiber composite material lamination is realized by a single bulletproof fiber material layer in a folding mode, the whole back plate is a whole piece of fiber single-layer cloth and is combined by an adhesive, the fiber length is effectively increased, the shearing force between the single bulletproof fiber material layers is increased, the rigidity is improved, blunt injuries are reduced, and depressions are reduced; in addition, the carbon ceramic sheet has better thermal shock resistance, the material is prevented from becoming soft gradually after the temperature of the elastic contact surface of the ceramic rises, and the impact back bulge is increased, so that the penetration depth of the warhead is reduced by increasing the fiber length, and the injury to a human body is reduced.
Drawings
FIG. 1 is a schematic structural view of a sag reduction ballistic panel construction of the present invention;
FIG. 2 is a schematic illustration of the folding of the ballistic resistant fibrous composite laminate of examples 1 and 2;
figure 3 is a schematic fold of the ballistic resistant fibrous composite laminate of example 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A bulletproof flashboard structure capable of reducing recess is characterized in that a bulletproof flashboard structure 1 is formed by compounding a carbon ceramic sheet 11 and a back plate 12 through an interface adhesive; the exterior of the bulletproof flashboard 1 is also wrapped with a shell 2;
the back plate 12 is a bulletproof fiber composite material lamination, the bulletproof fiber composite material lamination is formed by folding the width direction end of a bulletproof fiber material single layer 121 towards the other end for multiple times in a clockwise or anticlockwise direction, and each layer is compounded by an interface adhesive 122; the bulletproof fiber material single layer is prepared by gluing high-strength fibers arranged in a single orientation by an interface adhesive.
In the above technical scheme, the high-strength fibers are ultra-high molecular weight polyethylene fibers.
In the above technical scheme, the interface adhesive is a TPU hot melt adhesive film.
In the technical scheme, the back of the bulletproof flashboard is compounded with a honeycomb structure layer 3 through an interface adhesive, and the honeycomb structure layer is composed of a thermoplastic honeycomb board and foamed epoxy resin filled in pores of the thermoplastic honeycomb board.
Example 2
A bulletproof flashboard structure capable of reducing recess is characterized in that a bulletproof flashboard structure 1 is formed by compounding a carbon ceramic sheet 11 and a back plate 12 through an interface adhesive; the exterior of the bulletproof flashboard 1 is also wrapped with a shell 2;
the back plate 12 is a bulletproof fiber composite material lamination, the bulletproof fiber composite material lamination is formed by folding the length direction end of a bulletproof fiber material single layer 121 towards the other end for multiple times in a clockwise or anticlockwise direction, and each layer is compounded by an interface adhesive 122; the bulletproof fiber material single layer is prepared by gluing high-strength fibers arranged in a single orientation by an interface adhesive.
In the above technical scheme, the high-strength fibers are ultra-high molecular weight polyethylene fibers.
In the above technical scheme, the interface adhesive is a TPU hot melt adhesive film.
In the technical scheme, the back of the bulletproof flashboard is compounded with a honeycomb structure layer 3 through an interface adhesive, and the honeycomb structure layer is composed of a thermoplastic honeycomb board and foamed epoxy resin filled in pores of the thermoplastic honeycomb board.
Example 3
A bulletproof flashboard structure capable of reducing recess is characterized in that a bulletproof flashboard structure 1 is formed by compounding a carbon ceramic sheet 11 and a back plate 12 through an interface adhesive; the exterior of the bulletproof flashboard 1 is also wrapped with a shell 2;
the back plate 12 is a bulletproof fiber composite material lamination, the bulletproof fiber composite material lamination is formed by sequentially folding the width direction end of a bulletproof fiber material single layer 121 to the other end in a clockwise direction and a counterclockwise direction for multiple times, and each layer is compounded by an interface adhesive 122; the bulletproof fiber material single layer is prepared by coating high-strength fibers in single orientation arrangement by interface adhesive.
In the above technical scheme, the high-strength fibers are ultra-high molecular weight polyethylene fibers.
In the above technical scheme, the interface adhesive is phenolic resin.
In the technical scheme, the back of the bulletproof flashboard is compounded with a honeycomb structure layer 3 through an interface adhesive, and the honeycomb structure layer is composed of a thermoplastic honeycomb board and foamed epoxy resin filled in pores of the thermoplastic honeycomb board.
Performance verification
Ballistic impact tests were performed on examples 1, 2, and comparative examples, and the experimental data are shown in table 1.
The bulletproof inserting plate in the comparative examples 1 and 2 is compounded by the method in the example 1, and the difference is that the bulletproof fiber composite material lamination in the comparative examples 1 and 2 is formed by laminating a plurality of bulletproof fiber material single layers, the two adjacent bulletproof fiber material single layers are only compounded by an interface adhesive, and the back of the bulletproof inserting plate in the comparative example 2 is not compounded with a honeycomb structure layer;
TABLE 1
Figure BDA0002771419020000051
The data in table 1 show that the bulletproof fiber composite material lamination is realized by folding the bulletproof fiber material single layer, the whole back plate is a whole piece of fiber single layer cloth and is combined by the adhesive, the fiber length is effectively increased, the shearing force between the bulletproof fiber material single layers is increased, the rigidity is improved, blunt trauma is reduced, depression is reduced, and the bulletproof inserting plate has the capacity of defending multiple bullets.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A bulletproof flashboard structure capable of reducing recess is characterized in that the bulletproof flashboard structure is formed by compounding a carbon ceramic sheet and a back plate through an interface adhesive;
the back plate is a bulletproof fiber composite material lamination, the bulletproof fiber composite material lamination is formed by folding bulletproof fiber materials together in a single layer, and each layer is compounded through an interface adhesive; the bulletproof fiber material single layer is prepared by gluing high-strength fibers arranged in a single orientation by an interface adhesive.
2. A reduced sag ballistic insert panel structure according to claim 1, wherein: the bulletproof flashboard structure further comprises a shell covering the bulletproof flashboard.
3. A reduced sag ballistic insert panel structure according to claim 1, wherein: the bulletproof fiber composite material lamination is formed by folding one end of a bulletproof fiber material single layer towards the other end for multiple times in a clockwise or anticlockwise direction.
4. A reduced sag ballistic insert panel structure according to claim 1, wherein: the bulletproof fiber composite material lamination is formed by sequentially folding one end of a bulletproof fiber material single layer towards the other end in clockwise and anticlockwise directions for multiple times.
5. A reduced sag ballistic insert panel structure according to claim 1, wherein: the high-strength fiber is at least one of aramid fiber, ultra-high molecular weight polyethylene fiber or PBO fiber.
6. A reduced sag ballistic insert panel structure according to claim 1, wherein: the interface adhesive is at least one of TPU hot melt adhesive film, PO, PV, EVA hot melt adhesive film, epoxy adhesive, phenolic resin and styrene block copolymer elastomer.
7. A reduced sag ballistic insert panel structure according to claim 1, wherein: the back of the bulletproof flashboard is compounded with a honeycomb structure layer through an interface adhesive, and the honeycomb structure layer is composed of a thermoplastic honeycomb board and foamed epoxy resin filled in pores of the thermoplastic honeycomb board.
8. A ballistic resistant panel construction with reduced sag according to claim 3 or 4, wherein: one end of the bulletproof fiber material single layer is the length end or the width end of the bulletproof fiber material single layer.
CN202011250457.XA 2020-11-11 2020-11-11 Reduce sunken shellproof picture peg structure Pending CN112304160A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114603862A (en) * 2022-02-16 2022-06-10 上海浩魁材料科技有限公司 Novel composite concave reducing sheet for bulletproof flashboard and preparation method thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110090444A (en) * 2010-02-04 2011-08-10 국방과학연구소 The bullet-proof material of multilayer structure continued seamlessly and a method to manufacture the said material and protective clothing with the said material
CN104677195A (en) * 2015-02-11 2015-06-03 浙江美盾防护技术有限公司 Chest insertion board
CN106767171A (en) * 2017-01-16 2017-05-31 江苏安卡新材料科技有限公司 A kind of bulletproof composite sheet material and preparation method thereof
KR20180035322A (en) * 2016-09-29 2018-04-06 코오롱인더스트리 주식회사 Aramid paper composite for bulletproof pannel and bulletproof pannel comprising thereof
CN108151588A (en) * 2018-02-01 2018-06-12 山东中恒景新碳纤维科技发展有限公司 A kind of honeycomb barrier structure bulletproof flashboards and preparation method thereof
CN109029116A (en) * 2018-09-14 2018-12-18 江苏安卡新材料科技有限公司 A kind of carbon pottery bulletproof flashboards
CN109373819A (en) * 2018-12-06 2019-02-22 长沙盾甲新材料科技有限公司 High-strength polyurethane/fiber/ceramic structure armour
CN214892876U (en) * 2020-11-11 2021-11-26 江苏安卡新材料科技有限公司 Reduce sunken shellproof picture peg structure

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110090444A (en) * 2010-02-04 2011-08-10 국방과학연구소 The bullet-proof material of multilayer structure continued seamlessly and a method to manufacture the said material and protective clothing with the said material
CN104677195A (en) * 2015-02-11 2015-06-03 浙江美盾防护技术有限公司 Chest insertion board
KR20180035322A (en) * 2016-09-29 2018-04-06 코오롱인더스트리 주식회사 Aramid paper composite for bulletproof pannel and bulletproof pannel comprising thereof
CN106767171A (en) * 2017-01-16 2017-05-31 江苏安卡新材料科技有限公司 A kind of bulletproof composite sheet material and preparation method thereof
CN108151588A (en) * 2018-02-01 2018-06-12 山东中恒景新碳纤维科技发展有限公司 A kind of honeycomb barrier structure bulletproof flashboards and preparation method thereof
CN109029116A (en) * 2018-09-14 2018-12-18 江苏安卡新材料科技有限公司 A kind of carbon pottery bulletproof flashboards
CN109373819A (en) * 2018-12-06 2019-02-22 长沙盾甲新材料科技有限公司 High-strength polyurethane/fiber/ceramic structure armour
CN214892876U (en) * 2020-11-11 2021-11-26 江苏安卡新材料科技有限公司 Reduce sunken shellproof picture peg structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114603862A (en) * 2022-02-16 2022-06-10 上海浩魁材料科技有限公司 Novel composite concave reducing sheet for bulletproof flashboard and preparation method thereof
CN114603862B (en) * 2022-02-16 2024-03-26 上海浩魁材料科技有限公司 Novel composite concave reducing sheet for bulletproof plugboard and preparation method thereof

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