CN107289816B - Bulletproof helmet and preparation method thereof - Google Patents
Bulletproof helmet and preparation method thereof Download PDFInfo
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- CN107289816B CN107289816B CN201610974476.4A CN201610974476A CN107289816B CN 107289816 B CN107289816 B CN 107289816B CN 201610974476 A CN201610974476 A CN 201610974476A CN 107289816 B CN107289816 B CN 107289816B
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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
- F41H1/00—Personal protection gear
- F41H1/04—Protection helmets
Abstract
The invention relates to a bulletproof helmet, wherein a helmet shell is formed by pressing a plurality of layers of non-woven cloth round sheets of ultra-high molecular weight polyethylene fibers or films. The invention also relates to a preparation method of the bulletproof helmet.
Description
The application claims priority of Chinese patent application with application number 201610678263.7 and name of bulletproof helmet and preparation method thereof, which is submitted to China national intellectual property agency at 8 and 16 of 2016.
Technical Field
The invention relates to the technical field of bulletproof, in particular to a bulletproof helmet and a preparation method thereof.
Background
Currently, traditional bulletproof helmets are often prepared by the following production process: 1. firstly, cutting Polyethylene (PE) or aramid laid cloth according to a set shape, wherein a petal shape and a fan wheel shape are mostly adopted (see figure 1); 2. then stacking the cut pieces, and staggering a certain angle between each layer of cut pieces; 3. and (3) hot-press molding the finally laid bulletproof helmet blank (see figure 2) by adopting a mold.
However, the traditional fiber laid cloth cutting and laying damages the integrity, continuity and orthogonal structure of the unidirectional sheet to a certain extent, thereby affecting the diffusion speed of the shock wave and reducing the bulletproof performance of the bulletproof helmet.
On the other hand, conventional ultra-high molecular weight polyethylene (UHMWPE) fiber laid fabrics are generally made by embedding UHMWPE fibers in a unidirectional arrangement in a thermoplastic resin matrix, namely: arranging a plurality of UHMWPE fibers in order along one direction through a warping process such as uniform, parallel, straightening and the like, bonding the fibers by using thermoplastic resin to prepare unidirectional cloth, sequentially and crosswise laying at least two layers of multi-layer unidirectional cloth according to 0-degree or 90-degree, and bonding the unidirectional cloth of each layer by using thermoplastic resin to prepare the weft-free cloth by hot pressing.
Thermoplastic resin is used in the process of preparing unidirectional cloth from UHMWPE fibers, preparing non-woven cloth from the unidirectional cloth and pressing the non-woven cloth into the bulletproof helmet, a large amount of thermoplastic resin in the bulletproof helmet can cause the damage of a middle bullet part to rapidly expand when a bullet is ejected into the UHMWPE bulletproof helmet, large-area layering and obvious cracking can occur between the UHMWPE non-woven cloth layers, and the bulge height in the helmet caused by bullet impact is large.
In the process of preparing unidirectional cloth from UHMWPE fibers, the UHMWPE fiber sizing process is complex, the production efficiency is low, each UHMWPE fiber is an independent unit, the fiber warping process is complex, the production cost is high, defects such as broken filaments, twisting, winding and knotting, uneven arrangement and the like are easily caused in the technical processes of warping, gluing and the like, and the defects can prevent the weft-free cloth from effectively transmitting external force, so that the weft-free cloth elastic resistance is reduced.
Therefore, it is very significant to study the helmets prepared without damaging the integrity, continuity and orthogonality of the laid cloth, and it is expected that the bulletproof performance of the helmets can be greatly improved.
On the other hand, the aim of lightening bulletproof helmets while maintaining considerable bulletproof performance is also sought after in the field of bulletproof helmets.
Disclosure of Invention
In one aspect, the invention provides a ballistic resistant helmet, the shell of which can be compression molded from a plurality of layers of ultra-high molecular weight polyethylene fibers or films of a weft-free circular sheet.
In one embodiment, if the laid fabric is a ultra-high molecular weight polyethylene film-based laid fabric, the laid fabric may have an areal density of 60 to 120g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the If the laid fabric is a ultra-high molecular weight polyethylene fiber-based laid fabric, the areal density of the laid fabric may be 120-160g/m 2 。
In another embodiment, if the laid fabric is based on ultra high molecular weight polyethylene filmThe surface density of the helmet can be 4.0-8.0Kg/m 2 Preferably, the helmet can be formed by pressing 50-90 layers of ultra-high molecular weight polyethylene film weft-free cloth round sheets; if the laid fabric is a super high molecular weight polyethylene fiber based laid fabric, the helmet may have an areal density of 6.0 to 9.0Kg/m 2 Preferably, the helmet can be formed by pressing 60-70 layers of ultra-high molecular weight polyethylene fiber laid round sheets.
In yet another embodiment, the ultra-high molecular weight polyethylene film may have a breaking strength greater than 27g/D, a tensile modulus greater than 1600g/D, and an elongation at break less than 2.5%; the breaking strength of the ultra-high molecular weight polyethylene fiber can be more than 37g/D, the tensile modulus can be more than 1200g/D, and the breaking elongation can be less than 4.0%.
In one embodiment, the non-woven cloth can be prepared by crisscross lamination and laying of more than 2 ultra-high molecular weight polyethylene films, and connecting modes such as gluing, hot pressing or binding yarns; preferably, these ultra-high molecular weight polyethylene films may be laid up in stacks at non-zero angles. In a preferred embodiment, the laid fabric may be made of 4 ultra-high molecular weight polyethylene films laid in a crisscross pattern, for example, in a double transverse and double longitudinal layer and connected by gluing, hot pressing or binding yarns.
In another embodiment, the ballistic resistant helmet can further comprise a polycarbonate reinforced interior lining.
The invention also provides a preparation method of the bulletproof helmet, which can comprise the following steps:
(1) Cutting: cutting the weft-free cloth of the ultra-high molecular weight polyethylene fiber or film into round sheets and laminating;
(2) Preparing a helmet blank: laminating the non-woven circular sheets obtained in the step (1) in a mould for cold pressing to obtain a helmet blank;
(3) Preform preparation: placing the helmet blank in a pre-forming die, gradually forming the helmet blank, and gradually trimming redundant materials on the outer edge of the blank;
(4) Preparing a formed part: placing the preformed piece obtained in the step (3) into a forming die, shaping the preformed piece into a helmet, cooling, and taking out to obtain a semi-finished helmet; and
(5) Trimming, spraying paint, suspending and the like on the semi-finished helmet to obtain a finished helmet;
wherein the female mold used in steps (2) and (3) is petal-shaped, the outer surface of the male mold and the inner surface of the female mold are smooth, and the molds used in these two steps are identical except that the mold size used in step (3) is 70% -90% of the mold size used in step (2).
In another embodiment, if the laid fabric is a ultra high molecular weight polyethylene film laid fabric, the helmet may have an areal density of 4.0 to 8.0Kg/m 2 Preferably, the helmet can be formed by pressing 50-90 layers of ultra-high molecular weight polyethylene film weft-free cloth round sheets; if the weft-free cloth is ultra-high molecular weight polyethylene fiber weft-free cloth, the surface density of the helmet can be 6.0-9.0Kg/m 2 Preferably, the helmet can be formed by pressing 60-70 layers of ultra-high molecular weight polyethylene fiber laid round sheets.
In yet another embodiment, the ultra-high molecular weight polyethylene film may have a breaking strength greater than 27g/D, a tensile modulus greater than 1600g/D, and an elongation at break less than 2.5%; the breaking strength of the ultra-high molecular weight polyethylene fiber can be more than 37g/D, the tensile modulus can be more than 1200g/D, and the breaking elongation can be less than 4.0%.
Drawings
Fig. 1 is a schematic diagram of the shape of a wind impeller of a laid fabric cut-piece in a prior art bulletproof helmet manufacturing method, and the wind impeller structures of 0o, 15o, 30o and 45o are sequentially arranged from left to right.
Fig. 2 is a schematic diagram of a helmet blank in a prior art ballistic resistant helmet manufacturing process.
Fig. 3 is a schematic view of a UHMWPE laid circular sheet according to one embodiment of the invention.
Fig. 4 is a schematic view of a male mold and a female mold (left: male mold left; right: female mold front) used in the helmet blank preparation and preform preparation process steps according to an embodiment of the present invention.
Fig. 5 is a schematic view of a male mold and a female mold (left: male mold; right: female mold) used in the process step of producing a molded article according to an embodiment of the present invention.
Detailed Description
The helmet shell of the bulletproof helmet can be formed by pressing a plurality of layers of non-woven cloth round sheets of ultra-high molecular weight polyethylene fibers or films. As used herein, "circular sheet" or "wafer" refers to a sheet that is circular in shape and does not include any marks on its entire surface that would compromise its circular integrity, such as cut-out notches or the like.
The method directly cuts the non-woven cloth into the circular sheet, so that the complicated operation that the non-woven cloth needs to be cut into petal shapes or fan blade shapes in the traditional bulletproof helmet preparation is simplified, and the method is more critical to effectively ensure the integrity and continuity of the non-woven cloth material. The latter point is very important for bulletproof helmets because when bullets are shot into the bulletproof helmet with very high impulse, the discontinuous points in the helmet can cause damage to the middle bullet part not to spread around rapidly, thus possibly penetrating the helmet and causing life hazards. In order to reduce the discontinuous points of the fan blade wheel shape or petal-shaped laid fabric as much as possible in the prior art, each layer of cutting pieces are always required to be staggered for lamination by a certain angle, but the lamination mode is very complicated, and the adverse effect of the discontinuous points is reduced to a certain extent. The invention solves the problem of the bulletproof technician for many years fundamentally by directly pressing and forming the non-woven fabric wafer lamination.
In a preferred embodiment, the UHMWPE film laid fabric of the invention can be obtained by stacking more than 2 UHMWPE films and connecting the UHMWPE films by gluing, hot pressing or binding yarns; preferably, the polyethylene films may be laid up in a non-angular stack. As described in the background section, such a laid fabric obtained directly from UHMWPE film, rather than a unidirectional fabric made from UHMWPE fibers and thermoplastic resin, more effectively guarantees the integrity and continuity of the UHMWPE material and avoids the problem of affecting the ballistic performance of the finished ballistic helmet due to the presence of the thermoplastic resin. Of course, the invention is equally applicable to bulletproof helmets pressed from UHMWPE fiber laid cloth.
If UHMWPE film laid cloth is used, the resulting bulletproof helmet can have an areal density of 4.0-8.0Kg/m 2 Preferably 6.0Kg/m 2 . With reference to this areal density and considering the final ballistic performance (e.g., 1.1g simulated fragment V50 value), 50-90 layers of UHMWPE film laid round sheet may be compression molded. Specifically, according to the GA 293-2012 standard, the surface area of the helmet is certain: the surface area of the medium-sized naked helmet is 0.125m 2 The surface area of the large-size naked helmet is 0.13m 2 . The areal density of the helmet is therefore of course the smaller the better, so that the weight of the helmet can be made lighter. However, in order to ensure ballistic performance and that the helmet should have a certain rigidity, the helmet must also have a certain weight. In the invention, the UHMWPE film weftless fabric is used for preparing the helmet, the surface density is controlled to be 4.0-8.0Kg/m 2 On the premise of ensuring the anti-elastic performance, the helmet is successfully lightened as much as possible. For example, the weight of a large helmet is about 780g, the weight of a medium helmet is about 750g, and the V50 value of 1.1g of the simulated fragment can reach 650m/s.
If UHMWPE fiber laid cloth is used, the resulting bulletproof helmet can have an areal density of 6.0-9.0Kg/m 2 Preferably 8.0Kg/m 2 Also with reference to this areal density and taking into account the final ballistic performance, a 60-70 layer UHMWPE fiber laid round sheet may be compression molded.
In one embodiment, the UHMWPE film can have a breaking strength greater than 27g/D, a tensile modulus greater than 1600g/D, and an elongation at break less than 2.5%. In one embodiment, the UHMWPE fibers can have a breaking strength of greater than 37g/D, a tensile modulus of greater than 1200g/D, and an elongation at break of less than 4.0%.
The UHMWPE films used in the present invention can have an areal density of 70-110g/m 2 Whereas the surface density of the UHMWPE fibres may be 120-160g/m 2 The high-strength high-modulus light material can greatly reduce the weight of the bulletproof helmet prepared by the bulletproof helmet under the premise of keeping the bulletproof capability. The preparation process of the invention is also suitable for aramid fiber of light material.
The present inventors have studied to find that: according to the stress wave propagation mechanism, the stress wave propagates faster in the fiber with small bending degree than in the fiber with large bending degree, and the faster the stress wave is transmitted, the more energy is transmitted in unit time, the better the energy absorption effect is, so the unidirectional fabric of the orthogonal structure has better anti-elastic performance. In a preferred embodiment of the invention, the UHMWPE film laid fabric may be obtained from 4 UHMWPE films laid in a crisscross pattern, for example in a double transverse and double longitudinal layer and connected by gluing, hot pressing or binding yarns. The orthogonal structure of the unidirectional cloth can ensure the bulletproof effect to the greatest extent. As for the connection means such as gluing, hot pressing or binding yarns, this is a conventional connection means in the art, and may be selected by those skilled in the art according to actual needs.
The bulletproof helmet shell of the invention can be formed by pressing a plurality of layers of non-woven cloth round sheets of ultra-high molecular weight polyethylene fibers or films. Namely, the laid cloth is directly cut into circular sheets by a cutter, for example, a disc with the diameter of 550mm as shown in figure 3, and then the disc is directly laminated and pressed into a shape.
As described above, the laid fabric is directly cut into round sheets and directly laminated, so that complex shapes such as fan blade wheel shapes or petal shapes in the prior art and complicated operations of staggering each layer of cut pieces for a certain angle to place are avoided, and more importantly, the integrity, continuity and orthogonal structure of the laid fabric are not damaged, so that the diffusion speed of shock waves is not influenced, and the bulletproof performance of the helmet is effectively ensured.
However, when the laid cloth is not cut into a petal shape of the impeller, since the spherical surface area is minimum, more wrinkles are inevitably generated. To this end, the present invention effectively eliminates the wrinkling problem by handling 3 specific process steps of a laid circular sheet stack:
I. preparing a helmet blank: laminating the circular sheets of the weft-free cloth in a mould for cold pressing to obtain a helmet blank;
II, preparing a preform: placing the helmet blank in a pre-forming die, gradually forming the helmet blank, and gradually trimming redundant materials on the outer edge of the blank;
III, preparing a formed part: putting the preformed piece into a forming die, shaping the preformed piece into a helmet, cooling, and taking out to obtain a semi-finished helmet;
wherein the female mold used in step I and II is petal-shaped, the outer surface of the male mold and the inner surface of the female mold are smooth, and the molds used in both steps are identical except that the mold used in step II is 70% -90% of the mold used in step I; the mould used in step III may be a conventional mould used in the prior art for manufacturing bulletproof helmets, such as a setting mould in national standards.
Specifically, the preformed male mold used in step II may be 60-80mm smaller than the blank male mold used in step I, the preformed female mold may be 30-50mm smaller than the blank female mold, and the preformed male mold may be 50-65mm smaller than the blank male mold.
According to one embodiment of the invention, in step I, a circular sheet of laid-up fabric is laminated at ambient temperature and a pressure of 1-10MPa and cold-pressed in a female mold in the shape of petals (see fig. 4, which shows a male mold and a female mold used in the examples of the present application) for 5-60 seconds, resulting in a helmet blank. The master mold shown in fig. 4 has 6 petal openings, but this is merely exemplary and one skilled in the art can adjust the number of petal openings according to specific needs.
In step II, according to one embodiment of the invention, the helmet blank is placed in a preforming mould (the shape of which can also be seen in fig. 4), the helmet blank is gradually formed for 1-30 minutes at a temperature of 60-120 ℃ and a pressure of 1MPa-15MPa, and the blank is gradually trimmed of excess material on its outer edges. Where "step-wise" means that the temperature and pressure of the step are generally increased step-wise, e.g. the temperature may be increased in a linear fashion and the pressure may be increased step-wise (e.g. from atmospheric pressure to 1MPa, a step-wise pressure of 0.1-0.2-0.3 … … 0.9.9-1.0 MPa may be used). Of course, the pressure can also be applied directly in one step.
According to one embodiment of the present invention, in step III, the preform obtained in step II is placed in a molding die (refer to fig. 5, which shows a male die and a female die used in the examples of the present application), the preform is helmet-set at a temperature of 110 to 150 ℃ and a pressure of 10MPa to 30MPa for 5 to 60 minutes, and cold-molded at a temperature of 10 to 40 ℃ and a pressure of 10MPa to 30MPa for 1 to 30 minutes and then taken out, to obtain a semi-finished helmet product having a circular arc transition from the top to the lower edge of the helmet, a circular arc transition at the ears on both sides of the helmet, and a certain height gradient from the front and rear lower edges of the helmet.
Optionally, the temperature change process of steps I, II and III described above may both be performed in a linear fashion, while the pressure change process may be performed once or in a stepwise fashion.
In summary, by using the petal-shaped master molds for the helmet blanks and preforms in steps I, II and III, and in particular in steps I and II, as described above, and by gradually heating and pressurizing as much as possible in step II, these measures are focused on ensuring easy removal of wrinkles in the round sheet. Specifically, the petal-shaped female die used in the steps I and II can enable part of folds of the wafer to be extruded to the edges of petals as much as possible, so that the folds are conveniently sheared and removed. The three-step pressing process of steps I, II and III can effectively avoid deformation or displacement of the UHMWPE thermoplastic resin due to flow after being heated. In fact, the prior art generally adopts a one-step pressing process of hot pressing and then cold pressing, but because the main die of the helmet is generally spherical, the top stress of the helmet is obviously larger than the periphery of the helmet in the pressing process, so that the periphery of the helmet formed by one-step pressing is often not compact enough, and the bulletproof effect is reduced. The three-step pressing process of the invention effectively solves the defect of the prior art.
In accordance with the present invention, in one embodiment, the ballistic resistant helmet can further comprise a polycarbonate reinforced interior lining.
The invention also provides a preparation method of the bulletproof helmet, which can comprise the following steps:
(1) Cutting: cutting the weft-free cloth of the ultra-high molecular weight polyethylene fiber or film into round sheets and laminating;
(2) Preparing a helmet blank: laminating the non-woven circular sheets obtained in the step (1) in a mould for cold pressing to obtain a helmet blank;
(3) Preform preparation: placing the helmet blank in a pre-forming die, gradually forming the helmet blank, and gradually trimming redundant materials on the outer edge of the blank;
(4) Preparing a formed part: placing the preformed piece obtained in the step (3) into a forming die, shaping the preformed piece into a helmet, cooling, and taking out to obtain a semi-finished helmet; and
(5) Trimming, spraying paint, suspending and the like on the semi-finished helmet to obtain a finished helmet;
wherein the female mold used in steps (2) and (3) is petal-shaped, the outer surface of the male mold and the inner surface of the female mold are smooth, and the molds used in the two steps are identical except that the mold used in step (3) is 70% -90% of the mold used in step (2); the mould used in step (4) may be a conventional mould used in the prior art for the manufacture of bulletproof helmets, such as a setting mould in national standards.
It can be seen that steps (2), (3) and (4) actually correspond to steps I, II and III, respectively, as previously described, so the description above for steps I, II and III applies to steps (2), (3) and (4), respectively.
For a better understanding of the present invention, reference will now be made to the following examples which are, however, by no means to be construed as limiting the invention, in connection with the accompanying drawings.
Example 1
Medium size ballistic helmets were prepared using UHMWPE films according to the following procedure:
(1) Cutting: first 4 UHMWPE films are overlapped in a crisscrossed (i.e. 0 °/90 ° angle) manner and the surface of at least one monolayer is coated with polyurethane emulsion adhesive, thereby producing a laid fabric. The UHMWPE film has a breaking strength of about 30g/D, a tensile modulus of about 1700g/D, an elongation at break of about 2.2%, and an areal density of the resulting laid fabric of about 100g/m 2 。
The UHMWPE laid fabric was cut into 550mm diameter disks and 60 such disks were directly laminated.
(2) Preparing a helmet blank: placing the UHMWPE weft-free cloth wafer lamination obtained in the step (1) in a petal-shaped female die shown in figure 4 at the room temperature of 20 ℃, raising the pressure to about 4MPa at one time, and carrying out cold pressing on the wafer lamination for 15 seconds by using a male die under the pressure to obtain a helmet blank.
(3) Preform preparation: the helmet blank was placed in a preform mold (the shape is shown in fig. 4, the size is 80% of the blank mold), the helmet blank was molded stepwise by linearly increasing the temperature to 80 ℃ and the pressure to 11MPa once by a temperature control system for 8 minutes, and the excess material on the outer edge of the blank was trimmed stepwise in the process to prepare a preform.
(4) Preparing a formed part: and (3) placing the preformed piece obtained in the step (3) into a forming die (shown in figure 5), linearly increasing the temperature to 130 ℃ through a temperature control system, pressurizing the pressure to 23MPa for one time, shaping the preformed piece into a helmet for 20 minutes, then reducing the temperature to 20 ℃, continuing cold press molding under the pressure of 23MPa for 10 minutes, and taking out the preformed piece, thereby obtaining a semi-finished product of the helmet, wherein the arc transition is formed from the top of the helmet to the lower edge, the arc transition is formed at the ears at the two sides of the helmet, and the front and rear lower edges of the helmet have a certain height gradient.
(5) The semi-finished helmet is trimmed, painted, hung and the like to obtain the finished helmet.
The resultant helmet has a bare weight of about 750g and an areal density of about 6.0Kg/m 2 And 1.1g of the simulated fragment V50 test value was 650m/s.
Example two
A large size ballistic resistant helmet was prepared using UHMWPE film according to the following procedure:
(1) Cutting: first 4 UHMWPE films were overlapped in a crisscrossed (i.e. 0 °/90 ° angle) manner and the surface of at least one monolayer was coated with kraton d1161 glue, thereby producing a laid fabric. The UHMWPE film has a breaking strength of about 27g/D, a tensile modulus of about 1600g/D, an elongation at break of about 2.3%, and an areal density of the resulting laid fabric of about 80g/m 2 。
The UHMWPE laid fabric was cut into 550mm diameter disks and 81 such disks were directly laminated.
(2) Preparing a helmet blank: placing the UHMWPE laid fabric wafer laminate obtained in the step (1) in a petal-shaped female die shown in figure 4 at the room temperature of 20 ℃, raising the pressure to about 10MPa at one time, and carrying out cold pressing on the wafer laminate for 15 seconds by using a male die under the pressure to obtain a helmet blank.
(3) Preform preparation: the helmet blank was placed in a preform mold (the shape is 80% of the blank mold as shown in fig. 4), the temperature was linearly raised to 110 ℃ by a temperature control system, and the helmet blank was molded stepwise for 8 minutes during the increase of the pressure to 7MPa in a stepwise manner (i.e., from atmospheric pressure to 3MPa in 2 minutes, from 3MPa to 6MPa in 3 minutes to 6MPa, and from 6MPa to 7MPa in 7 minutes to 8 minutes), and the excess material on the outer edge of the blank was trimmed stepwise during this process, to produce a preform.
(4) Preparing a formed part: and (3) placing the preformed piece obtained in the step (3) into a forming die (shown in figure 5), linearly raising the temperature to 125 ℃ through a temperature control system, pressurizing the pressure to 20MPa for one time, shaping the preformed piece into a helmet for 40 minutes, then reducing the temperature to 16 ℃ and the pressure to 18MPa, cold-pressing and shaping for 20 minutes, and then taking out the helmet, thereby obtaining a semi-finished product of the helmet, wherein the arc transition is formed from the top of the helmet to the lower edge, the arc transition is formed from the two side ears of the helmet, and the front and rear lower edges of the helmet have a certain height gradient.
The resultant helmet has a bare weight of about 845g and an areal density of about 6.5Kg/m 2 And 1.1g of the simulated fragment V50 test value was 650m/s.
The following table sets forth a comparison of the performance of the helmet of the present invention with prior art helmets. It can be seen that the helmet of the present invention achieves a higher ballistic effect while reducing weight.
Claims (9)
1. A bulletproof helmet comprises a helmet shell, and is characterized in that the helmet shell is formed by pressing a plurality of layers of non-woven cloth round sheets of ultra-high molecular weight polyethylene fibers or films, the whole surface of the round sheets does not comprise any trace which damages the integrity of the round surfaces of the round sheets,
the preparation method comprises the following steps of,
(1) Cutting: cutting the weft-free cloth of the ultra-high molecular weight polyethylene fiber or film into round sheets and laminating;
(2) Preparing a helmet blank: laminating the non-woven circular sheets obtained in the step (1) in a mould for cold pressing to obtain a helmet blank;
(3) Preform preparation: placing the helmet blank in a pre-forming die, gradually forming the helmet blank, and gradually trimming redundant materials on the outer edge of the blank;
(4) Preparing a formed part: placing the preformed piece obtained in the step (3) into a forming die, shaping the preformed piece into a helmet, cooling, and taking out to obtain a semi-finished helmet; and
(5) Trimming, spraying paint and hanging the semi-finished helmet to obtain the finished helmet;
wherein the female mold used in step (2) and step (3) is petal-shaped, the outer surface of the male mold and the inner surface of the female mold are smooth, and the molds used in step (2) and step (3) are identical except that the mold used in step (3) is 70% -90% of the mold used in step (2),
the cold pressing temperature, the cold pressing pressure and the cold pressing time in the step (2) are respectively normal temperature, 1-10MPa and 5-60 seconds; the preforming temperature, pressure and time of the step (3) are respectively 60-120 ℃, 1-15 MPa and 1-30 minutes; the preparation temperature, pressure and time of the molded part in the step (4) are respectively 110-150 ℃, 10-30 MPa and 5-60 minutes, and the cold press molding temperature, pressure and time are respectively 10-40 ℃, 10-30 MPa and 1-30 minutes.
2. The bulletproof helmet according to claim 1, wherein if the laid fabric is a laid fabric of an ultra-high molecular weight polyethylene film, the laid fabric has an areal density of 60 to 120g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the If the weft-free cloth is the weft-free cloth of ultra-high molecular weight polyethylene fiber, the surface density of the weft-free cloth is 120-160g/m 2 。
3. Bulletproof helmet according to claim 1, characterized in that if the laid fabric is a laid fabric of ultra high molecular weight polyethylene film, the areal density of the helmet is 4.0-8.0Kg/m 2 If the weft-free cloth is ultra-high molecular weight polyethylene fiber weft-free cloth, the surface density of the helmet is 6.0-9.0Kg/m 2 。
4. The ballistic helmet of claim 1 wherein if the laid fabric is a ultra high molecular weight polyethylene film laid fabric, the helmet is formed by pressing 50-90 ultra high molecular weight polyethylene film laid fabric round sheet; if the weft-free cloth is the weft-free cloth of the ultra-high molecular weight polyethylene fiber, the helmet is formed by pressing 60-70 layers of ultra-high molecular weight polyethylene fiber weft-free cloth round sheets.
5. The ballistic resistant helmet of claim 1 wherein the ultra high molecular weight polyethylene film has a breaking strength greater than 27g/D, a tensile modulus greater than 1600g/D, and an elongation at break less than 2.5%; the breaking strength of the ultra-high molecular weight polyethylene fiber is more than 37g/D, the tensile modulus is more than 1200g/D, and the breaking elongation is less than 4.0%.
6. The bulletproof helmet according to any one of claims 1 to 5, wherein the laid cloth is obtained by stacking and laying 2 or more ultra-high molecular weight polyethylene films and connecting them by gluing, hot pressing or binding yarns.
7. Ballistic helmet according to any one of claims 1-5, wherein the laid fabric is produced from 4 ultra high molecular weight polyethylene films stacked in crisscross and connected by gluing, hot pressing or binding yarns.
8. The bulletproof helmet according to claim 7, wherein the weftless fabric is obtained by laying 4 ultra-high molecular weight polyethylene films in a double transverse double longitudinal layer and bonding, hot pressing or binding yarn connection mode.
9. The ballistic resistant helmet according to any one of claims 1-5, wherein the ballistic resistant helmet further comprises a polycarbonate reinforced lining panel.
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| CN108253844B (en) * | 2018-02-01 | 2020-03-27 | 军事科学院系统工程研究院军需工程技术研究所 | Automatic manufacturing method of bulletproof helmet |
| CN111113945A (en) * | 2019-12-17 | 2020-05-08 | 湖南中泰特种装备有限责任公司 | Method for manufacturing PE helmet |
| CN113618819A (en) * | 2021-07-23 | 2021-11-09 | 江西联创电声有限公司 | Cutting template of helmet body and method for preparing helmet body |
| CN113895053B (en) * | 2021-10-14 | 2024-03-08 | 西安康本材料有限公司 | Multi-curved-surface bulletproof helmet forming method |
| CN114619683A (en) * | 2022-01-26 | 2022-06-14 | 湖北爱骑士体育用品有限公司 | Safety helmet forming process and safety helmet |
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| CN102528998A (en) * | 2011-12-16 | 2012-07-04 | 宁波荣溢化纤科技有限公司 | Preparation method of ultra high molecular weight polyethylene bulletproof helmet |
| CN205439455U (en) * | 2013-06-20 | 2016-08-10 | 郑州中远防务材料有限公司 | One -way cloth, no latitude cloth and do not have fabric article of latitude |
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| DE502005004897D1 (en) * | 2005-02-04 | 2008-09-11 | Egon Busch | METHOD FOR PRODUCING A BALLISTIC PROTECTIVE TANK |
| US20110023202A1 (en) * | 2009-08-03 | 2011-02-03 | E.I. Du Pont De Nemours And Company | Method For Making a Composite Laminate |
| US20140250555A1 (en) * | 2013-03-05 | 2014-09-11 | Richard A. Carlson | Ballistic material with structural stays |
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| CN102528998A (en) * | 2011-12-16 | 2012-07-04 | 宁波荣溢化纤科技有限公司 | Preparation method of ultra high molecular weight polyethylene bulletproof helmet |
| CN205439455U (en) * | 2013-06-20 | 2016-08-10 | 郑州中远防务材料有限公司 | One -way cloth, no latitude cloth and do not have fabric article of latitude |
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| CN107289816A (en) | 2017-10-24 |
| CN207351295U (en) | 2018-05-11 |
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