CN111493590A

CN111493590A - Supporting device for infant carrier, manufacturing method thereof and infant carrier

Info

Publication number: CN111493590A
Application number: CN201910096817.6A
Authority: CN
Inventors: 郭征文
Original assignee: Wonderland Switzerland AG
Current assignee: Wonderland Switzerland AG
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2020-08-07

Abstract

The invention provides a supporting device for an infant carrier, a manufacturing method thereof and the infant carrier. The supporting device for the infant carrier is a polypropylene foaming material product formed by chemically foaming polypropylene and rubber, the strength of the product can be further improved by adding the rubber into the polypropylene, and the high-elasticity rubber can be filled between the polypropylene materials, so that the surface smoothness of the obtained product is high; by adopting the chemical foaming mode, the rubber can be filled with more gas generated in the chemical foaming after being melted, namely, more gas enters the mixture of the polypropylene and the rubber, so that the foaming ratio is large, and the weight of the obtained product can be greatly reduced.

Description

Supporting device for infant carrier, manufacturing method thereof and infant carrier

Technical Field

The present invention relates to the technical field of carriers, and in particular, to a supporting device for an infant carrier, a method for manufacturing the supporting device, and an infant carrier having the supporting device.

Background

The infant carrier is an apparatus for carrying infants and young children, such as a baby carriage, a baby dining chair, a baby crib, a basket, a safety chair, a baby rocking chair, a baby-embracing belt, and the like. With the continuous improvement of living standard of people, infant carrier widely gets into ordinary people's family. Infant carriers are available for infants, toddlers to sleep, eat, or sit comfortably, and because of the great convenience provided to caregivers, caregivers tend to place infants, whether at home or in other settings, within the infant carrier.

Because of the safety and comfort of infants and young children and the cost of carriers, infant carriers are generally composed of plastic parts and non-plastic parts, the plastic parts of infant carriers commonly used in the market at present, such as supporting devices for supporting in some infant carriers, are usually made of polypropylene (PP) resin materials, and the polypropylene resin materials are formed by single injection molding, so that the materials have high density and heavy weight and are very inconvenient to carry and move. For another common material, foamed polypropylene (EPP), although the weight can be reduced, the foamed polypropylene material has large particles, the surface of the manufactured product is rough and not smooth, and meanwhile, the strength of the product is not enough to meet the use requirement of the infant carrier, so that in many foamed polypropylene products, when the foamed polypropylene product is molded, a reinforcing part for improving the strength is fixed in a mold cavity of an injection molding machine, the reinforcing part and the foamed polypropylene are in an integrated structure, so that the strength of the foamed polypropylene product is improved, the difficulty of the molding process is undoubtedly increased in the mode, the production cost is also increased, the problem of rough appearance of the product is not solved, and the strength of the product is improved by adding the reinforcing part, but the weight of the product is also increased.

Therefore, there is a need to provide a new child carrier and a manufacturing method thereof, which is easy to carry and satisfies the requirements of strength and appearance, starting from the structure or manufacturing method of the child carrier.

Disclosure of Invention

The present invention provides a supporting device for a child carrier, a method for manufacturing the same, and a child carrier, wherein the supporting device and the child carrier are light in weight so as to be convenient for carrying and carrying, and can satisfy the requirements of strength and appearance at the same time.

In order to achieve the above object, one aspect of the present invention provides a supporting device for an infant carrier, wherein the supporting device for an infant carrier is a polypropylene foam product, and the polypropylene foam product is formed by chemically foaming polypropylene and rubber. The supporting device for the infant carrier is a polypropylene foaming material product formed by chemically foaming polypropylene and rubber, the strength of the product can be further improved by adding the rubber into the polypropylene, and the high-elasticity rubber can be filled between the polypropylene materials, so that the surface smoothness of the obtained product is high; by adopting the chemical foaming mode, the rubber can be filled with more gas generated in the chemical foaming after being melted, namely, more gas enters the mixture of the polypropylene and the rubber, so that the foaming ratio is large, and the weight of the obtained product can be greatly reduced.

The present invention provides a baby carrier with a supporting device for supporting a baby, wherein the supporting device is a polypropylene foam product, and the polypropylene foam product is formed by chemically foaming polypropylene and rubber. The supporting device mainly plays a role in supporting the infant carrier, the weight of the supporting device accounts for most of the weight of the infant carrier, and the strength of the supporting device also plays a role in determining the infant carrier, so that when the supporting device is high in strength and light in weight, the infant carrier with the same overall size is also high in strength and light in weight.

In another aspect, the present invention provides a method for manufacturing a supporting device for a child carrier, comprising the steps of:

(a) mixing polypropylene, rubber and foaming agent used in chemical foaming to form a mixture;

(b) melting the mixed mixture; and

(c) the melted compounded material is injected into a mold.

By adopting the manufacturing method of the invention, the gas generated by decomposing the foaming agent in the foaming process can be quickly sprayed and released by injection molding of the polypropylene and the rubber, thereby reducing the influence of gas escape on the foaming effect and reducing the generation of surface defects of the molded product.

Drawings

Fig. 1 is a perspective view of an embodiment of a child carrier according to the present invention.

Fig. 2 is a perspective view of another embodiment of the child carrier of the present invention.

Fig. 3 is a partial perspective view of the child carrier shown in fig. 2.

Fig. 4 is a partial bottom view of fig. 3.

Fig. 5 is a perspective view of another embodiment of a child carrier according to the present invention.

Fig. 6 is a partial perspective view of the child carrier of fig. 5.

Fig. 7 is a perspective view of another embodiment of the child carrier of the present invention.

Fig. 8 is a flow chart of the forming process of the supporting device for infant carrier of the present invention.

FIG. 9 is a schematic view of a supporting device for a child carrier according to the present invention.

FIG. 10 is a schematic view showing the temperature distribution of the material tube of the supporting device for a child carrier according to the present invention.

Description of the element reference numerals

100 baby carriage, 1 handrail, 2 seat plate, 3 crus backrest, 4 foot pedals, 5 locking mechanism, 6 bottom tube, 7a rear wheel set, 7b front wheel set, 8 screw component, 9 supporting back tube, 10U-shaped handle tube, 11 folding component, 12 rear U-shaped ceiling tube, 13 front U-shaped ceiling tube, 14 front connecting tube, 15U-shaped backrest ceiling tube and 16 through hole;

200 safety chair, 21 body, 211 side wall, 212 back board, 2121 through hole, 22 handle component, 23 base, 231 fixing part;

300 lifting baskets, 31 bottom plates, 311 through holes, 32 fixing frames and 33 lifting basket components;

400 baby dining chair, 41 chair body, 411 backrest part, 412 seat plate part, 42 calf backrest, 43 footboard, 44 dinner plate, 45 support frame body, 451 front foot frame, 452 rear foot frame, 453 upper support frame and 46 folding mechanism;

500, forming a polypropylene foaming material product, mixing polypropylene and rubber to form a mixture S01, melting the mixed mixture S02, introducing gas under a certain pressure, injecting the melted mixture S03 into a mold, cooling the mixture S04, injecting the melted mixture S into the mold, opening the mold S05, and taking out a finished product;

600 injection molding machine, 61 charging basket, 611 charging nozzle, 62 material pipe, 621 screw, 622 nozzle, 63 heating ring, 64 mould;

the temperature distribution of the 700 material pipe is T1, T2, T3, T4 and T5 which are temperature values.

Detailed Description

The technical solutions of the present invention are further illustrated by the following specific embodiments, but the present invention is not limited thereto.

The invention provides a supporting device for an infant carrier, which is a polypropylene foam material product formed by chemically foaming polypropylene and rubber. The supporting device for the infant carrier manufactured by the method is light in weight, high in strength and smooth in appearance. The supporting device for the infant carrier can also be provided with a body part, the body part is provided with a through hole, the through hole can be used for mounting or allowing a safety belt to penetrate through, and the supporting device for the infant carrier has extremely high strength at the through hole and can be used without additional components for increasing the strength. The polypropylene accounts for 50-99%, further 60-95%, and further 80-95% of the sum of the weight of the polypropylene and the weight of the rubber. More specifically, it may be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 99%. The rubber is one or more of nitrile rubber, hydrogenated nitrile rubber, silicon rubber, fluororubber, ethylene propylene rubber, fluorosilicone rubber and styrene butadiene rubber. The foaming ratio of the polypropylene and the rubber after chemical foaming molding is 500-3000%, namely the foaming ratio of the supporting device for the infant carrier is 500-3000%, so that the weight is greatly reduced.

The supporting device for the infant carrier provided by the invention can be applied to the infant carrier. The infant carrier generally includes a non-plastic part and a plastic part, wherein the non-plastic part is a non-plastic product, further, the non-plastic part is at least one selected from a metal part, a rubber part and a fiber part, and the metal part is a metal product and generally includes a bearing rod, a fixing rod, a screw assembly and the like in the infant carrier. The rubber member is a rubber product having elasticity, and generally includes a tire in a child car, an elastic band connecting wheels, and the like. The fiber member is a fiber product, and generally includes fabric products such as a seat belt and a sunshade in a child carrier. The supporting device is a polypropylene foaming material product which is formed by chemically foaming polypropylene and rubber, so that a cellular structure is formed in the product, and the weight of the infant carrier is greatly reduced.

The infant carrier can be applied to all infant carriers which comprise plastic parts and need to be carried or moved. The categories include, but are not limited to, strollers, safety chairs, baby dining chairs, hand baskets, cribs, baby bouncers. The related baby carriage, safety chair, baby dining chair, lifting basket, baby crib and baby rocking chair are all infant carriers available in the market at present, and the structure is generally known by the personnel in the industry.

When the infant carrier is a baby carriage, the handrails, the seat board, the calf rest and the pedal of the baby carriage are usually plastic parts, wherein the seat board forms a supporting device which is made of polypropylene foam materials, and the seat board is provided with through holes which are arranged along the vertical direction. It should be noted that, depending on different requirements, the stroller does not necessarily have the armrest, the seat plate, the crus rest, and the footrest at the same time, for example, the stroller only includes the armrest, the seat plate, and the footrest, but does not have the crus rest.

The infant carrier may be a stroller 100 as shown in fig. 1, a frame structure of the stroller 100 is composed of a bottom tube 6, a front connection tube 14 and a U-shaped handle tube 10, the bottom tube 6 and the front connection tube 14 are fixed by a screw assembly 8, the front connection tube 14 and the U-shaped handle tube 10 are pivoted, the U-shaped handle tube 10 is provided with two locking mechanisms 5 and a folding member 11, each locking mechanism 5 is arranged at a pivot joint of the front connection tube 14 and the U-shaped handle tube 10, the folding member 11 is arranged at a middle portion of the U-shaped handle tube 10, and the stroller is folded and unfolded by cooperation of the two locking mechanisms 5 and the folding member 11. The bottom tube 6 is provided with a rear wheel set 7a, the lower end of the front connecting tube 14 is provided with a front wheel set 7b, and the baby carriage can slide through the two wheel sets. The U-shaped handlebar tube 10 is provided with a front U-shaped ceiling tube 13, a rear U-shaped ceiling tube 12, a support back tube 9 and a U-shaped backrest tube 15, the front U-shaped ceiling tube 13 and the rear U-shaped ceiling tube 12 are pivoted on a first side part of the U-shaped handlebar tube 10, and a ceiling cloth (not shown) can be arranged between the two U-shaped ceiling tubes for shading sun or rain. The supporting back tube 9 and the U-shaped backrest shed tube 15 are fixedly arranged on the second side portion of the U-shaped handlebar tube 10 opposite to the first side portion, the seat plate 2 for a baby to sit is fixedly arranged on the lower portion of the supporting back tube 9, the U-shaped backrest shed tube 15 can be provided with backrest shed cloth (not shown in the figure) for shading sun or rain, the handrail 1 for the baby to sit on is arranged in front of the seat plate 2, the through hole 16 for ventilation is formed in the seat plate 2 along the vertical direction, the calf rest 3 for the baby to sit on is fixedly arranged on the seat plate 2, and the pedal plate 4 is arranged below the calf rest 3. The handrail 1, the seat board 2, the shank rest 3 and the pedal 4 of the baby carriage are all plastic parts, the two locking mechanisms 5, the bottom pipe 6, the screw component 8, the supporting back pipe 9, the U-shaped handlebar pipe 10, the front connecting pipe 14, the folding part 11, the rear U-shaped ceiling pipe 12, the front U-shaped ceiling pipe 13 and the U-shaped backrest ceiling pipe 15 are metal parts, the tires of the front wheel set 7b and the rear wheel set 7a are rubber parts, and the ceiling cloth and the backrest ceiling cloth are fiber parts. Meanwhile, the seat plate 2 is a polypropylene foam material product, which is formed by chemically foaming polypropylene and rubber, and the strength of the seat plate 2 at the through hole 16 is also extremely high, so that the seat plate can be used without additional components for increasing the strength.

When the infant carrier is a safety chair, the base of the safety chair, the backrest plate and the side walls of the body are all plastic parts, wherein the body forms a supporting device which is a polypropylene foaming material product, and the body is provided with a through hole for the safety belt to penetrate through.

The infant carrier may be an infant safety chair 200 as shown in fig. 2 to 4, the infant safety chair 200 includes a body 21 and a base 23, the body 21 and the base 23 are detachably connected, the connection structure may be a structure generally recognized by those skilled in the art and used for the detachable connection between components, for example, a fastening mechanism may be disposed between the body 21 and the base 23, so as to facilitate the detachment between the body 21 and the base 23. The base 23 is provided with a fixing part 231, and the fixing part 231 is provided with an ISO FIX connector to be inserted into an ISOFIX interface of the automobile seat, so that the base 23 and the automobile seat are fixed. The body 21 has a backrest 212 and two side walls 211, and the backrest 212 and the two side walls 211 together form a seating space for seating a baby. The backrest plate 212 has a through hole 2121 through which a seat belt passes. The safety chair 200 further comprises a lifting handle assembly 22, wherein the lifting handle assembly 22 is in an inverted U-shaped body, two ends of the lifting handle assembly 22 are pivoted on the outer surfaces of the two side walls 211, and the lifting handle assembly 21 can swing relative to the safety chair, so that the safety chair can be flexibly and conveniently taken down from the base 23 through the lifting handle assembly 22 to be transferred. The body 21, the handle assembly 22 and the base 23 of the safety chair 200 may all be plastic parts, and the engaging mechanism may be rubber parts. Furthermore, the body 21 is a polypropylene foam product formed by chemically foaming polypropylene and rubber, and the strength of the backrest plate 212 at the through hole 2121 is very high, so that no additional component for increasing the strength is required.

When the infant carrier is a basket, the bottom plate and the basket assembly of the basket can be plastic parts, the fixing frame can be metal or plastic parts, the bottom plate forms a supporting device which is a polypropylene foaming material product, and the bottom plate is provided with a through hole which is formed in the vertical direction. According to different requirements, the side surface of the lifting basket can also be provided with a baffle and forms a box body with the bottom plate of the lifting basket.

The infant carrier may be a basket 300 as shown in fig. 5, the basket 300 includes a bottom plate 31 and a fixing frame 32 mounted and fixed on the bottom plate 31, the bottom plate 31 and the fixing frame 32 enclose an area for an infant to lie on, and a basket assembly 33 is fixed on the fixing frame 32 to facilitate moving the basket 300. Further, as shown in fig. 5 and 6, the bottom plate 31 is provided with a through hole 311 for ventilation in the vertical direction. The bottom plate 31 is a polypropylene foam product, which is formed by chemically foaming polypropylene and rubber, and the strength of the bottom plate 31 at the through hole 311 is also extremely high, so that the bottom plate can be used without additional components for increasing the strength.

When the infant carrier is a baby dining chair, the seat body, the calf rest, the pedal plate and the dinner plate of the baby dining chair are plastic parts. The seat body forms a supporting device which is a polypropylene foaming material product, and the seat body is provided with a back plate and a seat plate part, and the seat plate part is provided with a through hole which is arranged along the vertical direction. It should be noted that, according to different requirements, the baby dining chair does not necessarily have a backrest, a seat portion, a crus rest, a footrest and a tray, for example, the baby dining chair only includes a seat body and a tray but does not have a crus rest and a footrest.

The infant carrier may be a baby dining chair 400 as shown in fig. 7, which comprises a seat body 41, a supporting frame 45 and a folding mechanism 46, wherein the seat body 41 is mounted on the supporting frame 45, and the supporting frame 45 is pivotally connected by the folding mechanism 46. The supporting frame 45 includes a front frame 451, a rear frame 452, and an upper supporting frame 453, the front frame 451 and the rear frame 452 are pivotally connected to each other through a folding mechanism 46, the front frame 451 is hollow, and the upper supporting frame 453 penetrates through the folding mechanism 46 and is telescopically disposed in the front frame 451. The seat body 41 includes a backrest 411 and a seat plate 412, the backrest 411 and the seat plate 412 are mounted on an upper support frame 453, and both of them constitute a seating area for an infant to sit, a lower leg rest 42 is mounted at the front end of the seat plate 412, a footrest 43 is mounted at the lower end of the lower leg rest 42 to support the infant's feet, a tray 44 is further mounted on the seat plate 412, the lower leg rest 42 and the tray 44 are pivoted together at the front end of the seat plate 412, and the seat plate 412 has a through hole (not shown) formed in the vertical direction. When the infant dining chair 400 is folded, the front leg frame 451 and the rear leg frame 452 are pivoted together, and the seat portion 412 is pivoted upward to fold the support frame 45 in the front-back direction and the height direction. The backrest 411, the seat portion 412, the lower leg rest 42, the footrest 43, the folding mechanism 46 and the tray 44 of the seat body 41 of the baby dining chair 400 are plastic components, and further, the seat body 41 is made of polypropylene foam material and is formed by chemically foaming polypropylene and rubber, and the strength of the seat portion 412 at the through hole is very high, so that the use can be satisfied without additional components for increasing the strength.

When the infant carrier is a baby crib, the baby crib is provided with a bottom plate, the bottom plate forms a supporting device, and the bottom plate is provided with a through hole which is arranged along the vertical direction and can be used for ventilation. The bottom plate of the crib is made of polypropylene foaming material products, the bottom plate is formed by chemically foaming polypropylene and rubber, the strength of the bottom plate at the through hole is extremely high, and the crib can be used without additional components for increasing the strength. It should be noted that, according to different requirements, the side of the crib can also be provided with a baffle plate and form an accommodating cavity for accommodating the baby together with the bottom plate of the crib.

When the infant carrier is an infant rocking chair, the infant rocking chair is provided with a chair body, the chair body forms a supporting device, and the chair body is provided with a through hole which is arranged along the vertical direction and can be used for ventilation. The chair body of the baby rocking chair is made of polypropylene foaming material products, the chair body is formed by chemically foaming polypropylene and rubber, the strength of the chair body at the through hole is extremely high, and the baby rocking chair can be used without additional components for increasing the strength. It should be noted that, according to different requirements, the two sides of the baby rocking chair may be provided with armrests, and the armrests may also be plastic parts.

The invention also provides a manufacturing method of the supporting device for the infant carrier, which comprises the following steps:

(a) mixing polypropylene, rubber and a foaming agent to form a mixture;

(b) melting the mixed mixture; and

(c) the melted mixture is injected into a mold.

The supporting device for the infant carrier is light, high in strength and smooth in appearance.

Further, the manufacturing method may further include: (d) cooling the melted mixture injected into the mold; (e) the mold is opened and the finished product is removed.

Through the injection molding of polypropylene and rubber, the gas generated by the decomposition of the foaming agent in the foaming process can be quickly sprayed and released, thereby reducing the influence of the escape of the gas on the foaming effect and reducing the generation of surface defects of the molded product.

The supporting device for infant carrier is formed by chemically foaming polypropylene and rubber, and as shown in a flow chart of forming a polypropylene foam material product shown in fig. 8, a flow chart 500 of forming the polypropylene foam material product sequentially comprises:

step S01 mixing polypropylene, rubber and foaming agent used in chemical foaming to form a mixture;

step S02 melting the mixed mixture;

step S03 of injecting the melted mixture into a mold;

step S04, cooling the melted mixture injected into the mold; and

step S05 opens the mold and takes out the finished product.

After the step S01 of mixing the polypropylene, the rubber, and the foaming agent to form a compounded material, the step S02 melts the mixed compounded material, and then S03 injects the melted compounded material into a mold through an injection molding machine.

Step S01 mixing polypropylene, rubber, and a foaming agent to form a mixture: the mixing is carried out by mixing polypropylene, rubber and foaming agent in a charging basket of an injection molding machine. The polypropylene resin has the advantages of corrosion resistance, good strength and rigidity, high melt index and uniform dispersion with rubber.

Step S02 melts the mixed mixture: the melting is that the mixed material mixed in the charging basket enters a material pipe of the injection molding machine from a charging nozzle of the charging basket, is sheared under the action of a screw in the material pipe and is melted by utilizing the frictional heat of the screw.

Step S03, injecting the melted mixture into a mold: the injection is to inject the melted material melted in the step S02 into the mold through the nozzle of the material pipe. Furthermore, the nozzle is preferably a closed nozzle which can be closed after the injection is finished, thereby effectively preventing flash and foaming from being premature and preventing bubbles injected into the plastic of the mold from returning to the material pipe.

Furthermore, the heating ring is arranged outside the material pipe, the temperature of the material pipe is controlled by the heating ring to rise from the material nozzle to the nozzle and then fall, namely, the temperature of the middle temperature of the material pipe is low at the two high ends, the temperature of the middle part of the material pipe is high, the mixture can be better melted in the material pipe, the temperature of the part, close to the material pipe, of the material pipe is low, and the phenomenon that the foaming effect of the forming in the mold is influenced due to the fact that the foaming in the material pipe is too fast can be avoided. The temperature of the material pipe close to one end of the nozzle can be 190-220 ℃, and the temperature of the material pipe close to one end of the nozzle can be 165-185 ℃. Preferably, as shown in fig. 6, the temperature of the material tube is divided into five sections from the material nozzle to the shooting nozzle, which are T5, T4, T3, T2 and T1, and preferably, the heating ring controls the temperature values to be 170 ℃, 180 ℃, 210 ℃ and 200 ℃ in sequence, and the temperature of each section can allow an error of ± 5 ℃. Furthermore, the injection speed of the injection mold is 200-250 g/s, preferably 220g/s, so as to avoid the early expansion of the small molecule gas dissolved in the molten material, and the gas is expanded from the inside to the outside of the molten material after being injected into the mold, so that the plastic foaming part obtains uniform foaming distribution and a hard surface, namely, better strength and rigidity are obtained.

Step S04 cooling the melted mixture injected into the mold: the cooling is to cool the melted mixture injected into the mold, and the cooling mode can cool the melted mixture injected into the mold naturally at room temperature or can cool the mixture quickly by reducing the temperature of the mold. The temperature of the mold is lowered so that the mold is cooled below room temperature by being placed under cooling water before the molten material is injected.

Step S05 opens the mold and takes out the finished product: and opening the mold after molding, and taking out the mold to obtain the polypropylene foaming material product, wherein the foaming ratio of the polypropylene foaming material product is 500-3000%, and the weight of the product obtained after molding is far less than that of the polypropylene product under the same volume.

Further description of the manufacturing method is provided in conjunction with the apparatus used in the manufacturing process, as shown in FIG. 9, which is a schematic diagram of an injection molding machine. The injection molding machine 600 includes a barrel 61, a material pipe 62 connected to a nozzle 611 of the barrel 61, a rotatable screw 621 disposed in the material pipe 62, a heating ring 63 disposed outside the material pipe 62, and a nozzle 622 of the material pipe 62 disposed corresponding to the mold 64. Plastics and foaming agent are mixed in a charging basket 61, the mixed mixture enters a material pipe 62 from a material nozzle 611 of a charging basket 1, a heating ring 63 outside the material pipe 62 controls the temperature of the material pipe 62 to increase and then decrease from the material nozzle 611 to a nozzle 622, the temperature of the material pipe 62 is divided into five sections from the material nozzle 611 to the nozzle 622, and the heating ring 63 controls temperature values to be 170 ℃ (T5), 180 ℃ (T4), 210 ℃ (T3), 210 ℃ (T2) and 200 ℃ (T1) in sequence (as shown in FIG. 10). The mixture is sheared under the action of the screw 621 in the material pipe 62 and is melted by the heat generated by friction of the screw 621 and the heating condition of the heating ring 63, the melted material is injected into the mold 64 through the injection nozzle 622 of the material pipe 62, and the plastic foaming part is obtained after the molding through natural cooling at room temperature or quick cooling by reducing the temperature of the mold 64.

The supporting device for a child carrier, the child carrier, and the method for manufacturing the supporting device for a child carrier according to the present invention will be described in detail with reference to specific embodiments.

Example 1

An infant safety chair 200 with a structure as shown in fig. 2, the infant safety chair 200 includes a body 21 and a base 23, the body 21 is detachably connected with the base 23, and the connection structure can be a structure generally recognized by those skilled in the art and can be used for detachable connection between components. The base 23 is provided with a fixing part 231, and the fixing part 231 is provided with an ISO FIX connector to be inserted into an ISOFIX interface of the automobile seat, so that the base 23 and the automobile seat are fixed. The body 21 has a backrest 212 and two side walls 211, and the backrest 212 and the two side walls 211 together form a seating space for seating a baby. The backrest plate 212 has a through hole 2121 through which a seat belt passes. The safety chair 200 further comprises a lifting handle assembly 22, wherein the lifting handle assembly 22 is in an inverted U-shaped body, two ends of the lifting handle assembly 22 are pivoted on the outer surfaces of the two side walls 211, and the lifting handle assembly 21 can swing relative to the safety chair, so that the safety chair can be flexibly and conveniently taken down from the base 23 through the lifting handle assembly 22 to be transferred. The handle assembly 22 and the base 23 are formed by ordinary polypropylene injection molding (the same as the molding process of comparative example 1), and the body 21 is a polypropylene foam material product formed by chemically foaming polypropylene and rubber.

The handle assembly and the base are all manufactured by adopting a general molding process on the market at present, and the specific molding process of the body is as follows: mixing the hydrogenated nitrile rubber with the weight percentage of 95 percent and the polypropylene with the weight percentage of 5 percent in a charging basket of an injection molding machine, and sodium bicarbonate which accounts for 3 percent of the weight of the polypropylene is added for mixing, the mixed mixture enters the material pipe from the material nozzle of the charging basket, the heating ring outside the material pipe controls the temperature of the material pipe to firstly rise and then fall from the material nozzle to the direction of the closed nozzle, the temperature of the material pipe is divided into five sections from the material nozzle to the injection nozzle, the temperature values of the heating ring are controlled to be 170 ℃, 180 ℃, 210 ℃ and 200 ℃ in sequence, the mixture is sheared under the action of a screw rod in the material pipe and is melted under the conditions of frictional heat of the screw rod and heating of the heating ring, and the nitrogen is also fused in the melting material, the melted melting material is injected into the mould at 220g/s through the injection nozzle of the material pipe, the nitrogen in the material is decompressed and then escapes from the melted material, and the body can be obtained by natural cooling at room temperature, and the foaming ratio is 1500%.

Comparative example 1

An infant safety chair 200 with a structure as shown in fig. 2, the infant safety chair 200 includes a body 21 and a base 23, the body 21 is detachably connected with the base 23, and the connection structure can be a structure generally recognized by those skilled in the art and can be used for detachable connection between components. The base 23 is provided with a fixing part 231, and the fixing part 231 is provided with an ISO FIX connector to be inserted into an ISOFIX interface of the automobile seat, so that the base 23 and the automobile seat are fixed. The body 21 has a backrest 212 and two side walls 211, and the backrest 212 and the two side walls 211 together form a seating space for seating a baby. The backrest plate 212 has a through hole 2121 through which a seat belt passes. The safety chair 200 further comprises a lifting handle assembly 22, wherein the lifting handle assembly 22 is in an inverted U-shaped body, two ends of the lifting handle assembly 22 are pivoted on the outer surfaces of the two side walls 211, and the lifting handle assembly 21 can swing relative to the safety chair, so that the safety chair can be flexibly and conveniently taken down from the base 23 through the lifting handle assembly 22 to be transferred. The body 21, the handle assembly 22 and the base 23 are all formed by injection molding of polypropylene.

The shaping of body, carrying handle subassembly and base specifically does: polypropylene is stirred in a charging basket of an injection molding machine, stirred materials enter a material pipe from a charging nozzle of the charging basket, a heating ring outside the material pipe controls the temperature of the material pipe to rise and then fall from the charging nozzle to a closed injection nozzle, the temperature of the material pipe is divided into five sections from the charging nozzle to the injection nozzle, the heating ring controls the temperature values to be 170 ℃, 180 ℃, 210 ℃ and 200 ℃ in sequence, a mixed material is sheared under the action of a screw rod in the material pipe and is melted by utilizing the frictional heat of the screw rod and the heating condition of the heating ring, the melted materials are injected into a mold at 220g/s through the injection nozzle of the material pipe, and the body, the handle assembly and the base can be obtained through natural cooling at room temperature.

Comparative example 2

An infant safety chair 200 with a structure as shown in fig. 2, the infant safety chair 200 includes a body 21 and a base 23, the body 21 is detachably connected with the base 23, and the connection structure can be a structure generally recognized by those skilled in the art and can be used for detachable connection between components. The base 23 is provided with a fixing part 231, and the fixing part 231 is provided with an ISO FIX connector to be inserted into an ISOFIX interface of the automobile seat, so that the base 23 and the automobile seat are fixed. The body 21 has a backrest 212 and two side walls 211, and the backrest 212 and the two side walls 211 together form a seating space for seating a baby. The backrest plate 212 has a through hole 2121 through which a seat belt passes. The safety chair 200 further comprises a lifting handle assembly 22, wherein the lifting handle assembly 22 is in an inverted U-shaped body, two ends of the lifting handle assembly 22 are pivoted on the outer surfaces of the two side walls 211, and the lifting handle assembly 21 can swing relative to the safety chair, so that the safety chair can be flexibly and conveniently taken down from the base 23 through the lifting handle assembly 22 to be transferred. The handle assembly 22 and the base 23 are formed by injection molding of common polypropylene (the same as the molding process of comparative example 1), and the body 21 is a product of a common polypropylene foam material, which is formed by foaming polypropylene and a foaming agent.

The foaming forming process of the body comprises the following steps: polypropylene and a sodium bicarbonate foaming agent accounting for 3 percent of the weight of the polypropylene are mixed in a charging basket of an injection molding machine, the mixed mixture enters a material pipe from a material nozzle of the charging basket, a heating ring outside the material pipe controls the temperature of the material pipe to rise and then fall from the material nozzle to a closed injection nozzle, the temperature of the material pipe is divided into five sections from the material nozzle to the injection nozzle, the heating ring controls the temperature values to be 170 ℃, 180 ℃, 210 ℃ and 200 ℃ in sequence, the mixture is sheared under the action of a screw rod in the material pipe and is melted by utilizing the frictional heat of the screw rod and the heating condition of the heating ring, the melted material is injected into a mold at 220g/s through the injection nozzle of the material pipe, and the body can be obtained through natural cooling at room temperature.

The appearance of the bodies obtained in example 1 and comparative examples 1 to 2 was observed, and the following strength test was performed.

The strength test method comprises the following steps: the infant safety chair and body prepared according to various embodiments are tested for lateral impact in a backward riding manner by using a prosthesis of a young child (Q1) according to the R129 regulation of the european Economic Commission of economies of life (ECE), and all the test conditions are performed according to the test conditions defined by the R129 regulation, which will not be described herein again.

The test results are shown in table 1 below, wherein the Head injury index (HPC 15) is calculated by using the reading values of a plurality of sensors through a calculation formula provided by the R129 rule, and the Head Resultant Acceleration (HRA) is obtained by adding the values measured by using the three-axis acceleration sensors provided on the Head, and is a key observation item for observing the strength and the shock absorption function of the infant safety chair, the body, and the headrest prepared from the foam material, wherein the smaller the values measured by the Head injury index and the Head resultant acceleration are, the better the protection effect of the infant safety chair, the body, and the headrest is, and the protection and shock absorption properties of the foam material are evaluated through the two values.

TABLE 1 test results of example 1 and comparative examples 1-2

As can be seen from Table 1, the supporting device for infant carriers according to the present invention and the supporting device for infant carriers manufactured by the manufacturing method of the present invention, as a new polypropylene foaming product, compared with a single polypropylene forming product and a common foaming polypropylene product, the polypropylene foaming product has smoother appearance, and when being used as a main material of a baby safety chair, a body and a headrest, the acceleration of the vehicle platform at the impact moment is larger, the head injury index and the head resultant acceleration are smaller, which means that the new polypropylene foaming product has higher strength, can improve the head protection capability of the baby safety chair to the user, effectively reduce the damage to the head of the user when the vehicle is impacted, greatly improve the practicability and the usability, meanwhile, the novel polypropylene foamed product is formed by chemically foaming polypropylene and rubber, and is lighter in weight compared with a single polypropylene formed product.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications and alterations to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles disclosed herein.

Claims

1. The supporting device for the infant carrier is characterized by being a polypropylene foam material product, wherein the polypropylene foam material product is formed by chemically foaming polypropylene and rubber.

2. The supporting device for infant carrier as claimed in claim 1, further comprising a body, wherein the body has a through hole.

3. The supporting device for a child carrier according to claim 1, wherein a foaming ratio of the polypropylene and the rubber after chemical foaming is 500 to 3000%.

4. The supporting device for a child carrier according to claim 1, wherein the foaming agent used for the chemical foaming is at least one of an inorganic foaming agent and an organic foaming agent.

5. The support device for a child carrier of claim 4, wherein the inorganic foaming agent is selected from one or more of sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, and ammonium nitrate.

6. The support device for a child carrier according to claim 4, wherein the organic foaming agent is one or more selected from the group consisting of citric acid, succinic acid, oleic acid, and oxybenzenesulfonic acid hydrazide.

7. The infant carrier is characterized by comprising a supporting device with a supporting function, wherein the supporting device is a polypropylene foam material product, and the polypropylene foam material product is formed by chemically foaming polypropylene and rubber.

8. A child carrier as claimed in claim 7, wherein the child carrier is a stroller having a seat plate forming the support means, the seat plate having a through hole therein which is vertically open.

9. A child carrier as claimed in claim 7, wherein the child carrier is a safety seat having a body forming the support means, the body having a through hole for a harness to pass through.

10. A child carrier as claimed in claim 7, wherein the child carrier is a baby dining chair having a seat body forming the support means, the seat body having a backrest plate and a seat plate portion with a through hole extending in a vertical direction.

11. The child carrier of claim 7, wherein the child carrier is a basket having a bottom panel forming the support means, the bottom panel having a through hole formed therein in a vertical direction.

12. A child carrier as claimed in claim 7, wherein the child carrier is a crib having a base plate forming the support means, the base plate having a through hole formed therein in a vertical direction.

13. A child carrier as claimed in claim 7, wherein the child carrier is a baby rocking chair having a chair body forming the support means, the chair body having a through hole formed therein in a vertical direction.

14. The method of manufacturing a supporting device for a child carrier as claimed in any one of claims 1 to 6, comprising the steps of:

(a) mixing the polypropylene, the rubber and a foaming agent used for the chemical foaming to form a mixture;

(b) melting the mixed mixture; and

(c) injecting the melted mixture into a mold.

15. The method of claim 14 wherein step (a) further comprises mixing the polypropylene, the rubber, and the foaming agent into a barrel of an injection molding machine.

16. The method of manufacturing a support device for a child carrier according to claim 14, wherein the step (b) further comprises feeding the mixed material from the barrel into a tube of the injection molding machine from a nozzle of the barrel, and shearing and melting the mixed material by a screw in the tube.

17. The method of claim 16, wherein step (c) further comprises injecting the melted mixture through a nozzle of the tube into a mold.

18. The method of claim 14, wherein the injection speed of the step (c) injection mold is 200-250 g/s.

19. The method of making a support device for a child carrier of claim 17, wherein said nozzle is a locking nozzle.

20. The method of claim 17, wherein step (b) further comprises: and arranging a heating ring outside the material pipe, wherein the heating ring controls the temperature of the material pipe to rise from the material nozzle to the nozzle and then fall.

21. The method of manufacturing a supporting device for a child carrier according to claim 20, wherein the heating ring controls the temperature of the material tube to be divided into five sections in a direction from the material nozzle to the nozzle, the five sections being 170 ℃, 180 ℃, 210 ℃, and 200 ℃ in this order.

22. The method of claim 14 further comprising:

(d) cooling the melted mixture injected into the mold.

23. The method of claim 22, further comprising the step of, after said step (d):

(e) the mold is opened and the finished product is removed.

24. The method of manufacturing a supporting device for a child carrier as claimed in claim 23, wherein the foaming ratio of the finished product is 500-3000%.