Stirring type cosmetic bottle
By designing the stirring element and limiting structure of the stirring cosmetic bottle, the problem of uneven application caused by the sedimentation of makeup materials in the lip gloss bottle is solved, achieving convenient stirring and even application of makeup materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO JIELI COSMETIC PACKAGING CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-05-12
AI Technical Summary
The lip gloss in existing lip gloss bottles is prone to settling due to its viscous texture, resulting in layering and uneven application. It is also difficult to pick up enough product using the existing brush head, and the ingredient ratio is uneven, which affects the application effect.
Design a stirring cosmetic bottle that includes a stirring component with axial and rotational stirring functions. By pressing or rotating the cap, the stirring component can be driven to achieve reciprocating and rotational stirring of the cosmetics. Combined with a limiting structure and elastic components, it can be made easy to operate.
It enables convenient mixing of makeup materials, improves the evenness of mixing and the application effect, and simplifies the usage process.
Smart Images
Figure CN224219665U_ABST
Abstract
Description
Technical Field
[0001] This technical solution relates to the field of cosmetic tools technology, specifically a stirring cosmetic bottle. Background Technology
[0002] A cosmetic bottle is a container specifically designed to hold liquid or gel-based makeup products (such as lip gloss). It is sealed to prevent the lip gloss from drying out, leaking, or spoiling. It typically includes a bottle body, a cap, and a built-in application brush.
[0003] For example, Chinese patent CN111012022A discloses a sealed lip gloss bottle, which includes a bottle body, an outer cap at the top of the bottle body, an inner cap inside the outer cap, a bristle rod vertically arranged inside the bottle body, the upper end of the bristle rod being connected to the inner cap, a connecting hole at the bottom of the bristle rod, and a bristle head on the connecting hole. The bristle head is an arc-shaped brush head that conforms to the shape of the lips, so as to accurately outline the lip shape and evenly apply the lip gloss.
[0004] The aforementioned lip gloss bottles are filled with lip gloss and other cosmetic balms. Because of their viscous texture, lip gloss is prone to settling. After settling, it will separate into layers, stick to the bottle wall, and have an uneven texture. This makes it difficult to pick up enough lip gloss with just the brush, and the proportion of lip gloss components picked up is uneven. When applying it later, it is easy to have defects such as uneven application and patchy color, resulting in poor application effect and affecting the makeup experience. It is also difficult to fully and quickly stir the lip gloss in the bottle, making it inconvenient to use. Summary of the Invention
[0005] This technical solution addresses the problem of inconvenient use caused by the difficulty in stirring lip gloss within the bottle by providing a stirring-type cosmetic bottle.
[0006] The purpose of this technical solution is achieved as follows:
[0007] A stirring cosmetic bottle includes a bottle body having a cavity for containing cosmetic ingredients, characterized in that it further includes:
[0008] A stirring component is movably installed inside the material cavity. The stirring component includes a telescopic section extending spirally about its axial direction and an agitating section disposed on the telescopic section. One end of the telescopic section abuts against the inner wall of the material cavity.
[0009] The cover includes an outer cover and a pressure cap that slides on the outer cover, the pressure cap being provided with a brush rod, the front end of the brush rod extending through to the stirring element;
[0010] An elastic element is disposed between the outer cover and the pressure cap, and the elastic force of the elastic element causes the pressure cap to tend to move outward relative to the outer cover;
[0011] A limiting structure is provided between the brush rod and the stirring component. When the pressure cap is pressed to push the brush rod, the brush rod pushes the stirring component axially through the limiting structure, thereby forcing the telescopic section to compress axially.
[0012] Through the above technical solution, when a stirring cosmetic bottle is in normal use, pressing the cap causes the brush rod to axially push the stirring component in the material chamber downward through the limiting structure, causing the telescopic section on the stirring component to undergo axial compression deformation. The telescopic section directly stirs the lip gloss in the bottle in a vertical direction relative to the stirring section. After releasing the cap, the elastic element pushes the cap and brush rod back to their original positions, and the telescopic section also rebounds and stirs the makeup again in the opposite direction. This reciprocating operation realizes the reciprocating up-and-down stirring of the makeup, thereby achieving convenient stirring of the makeup. The operation of stirring makeup is more convenient and easy to use.
[0013] Preferably, the limiting structure includes guide protrusions and limiting parts. The inner wall of the stirring section is provided with a plurality of guide protrusions along the circumferential direction, and a limiting groove is formed between adjacent guide protrusions. The limiting parts protrude from the outer wall of the brush rod.
[0014] The limiting groove extends through the side opposite to the telescopic section, and the side of the limiting groove opposite to the through end has an abutting surface. The limiting part is fitted into the through end of the limiting groove one by one, and the limiting part can abut against the abutting surface.
[0015] With the above technical solution, the snap-fit parts are all embedded into the corresponding snap-fit grooves through the through end of the snap-fit grooves. The snap-fit parts slide freely along the axial direction of the snap-fit grooves. During the pressing operation, the snap-fit parts slide downwards along the grooves until the snap-fit parts abut against the abutting surface, thereby transmitting the pushing force to the stirring component and realizing the compression of the telescopic section.
[0016] Preferably, the number of the limiting slots is greater than the number of limiting portions, and the limiting portions can be fitted into different limiting slots.
[0017] Through the above technical solution, the limiting part can arbitrarily select multiple limiting slots at various distribution positions for fitting, so that when the brush rod is inserted into the cavity of the stirring component, there is no need for precise angle alignment, reducing the assembly alignment accuracy requirements and improving the insertion efficiency and ease of operation of the brush rod and the stirring component.
[0018] Preferably, the stirring component is a hollow tube with an internal cavity. The stirring component also includes an agitation section disposed on the telescopic section. The agitation section includes a main rib and several agitation ribs disposed on the outside of the main rib. The main rib has a material passage hole, and the inner wall of the cavity corresponding to the main rib is provided with the guide protrusion.
[0019] Through the above technical solution, the stirring section and the telescopic section vertically stir the makeup in the material cavity in sections. The inner wall of the cavity corresponding to the main rib of the stirring section has the above-mentioned guide strips. The brush rod is inserted into the cavity, and the main rib provides a stable base for fitting. The material passage hole forms a dynamic flow channel during the stirring process of the stirring component, which promotes the flow and exchange of makeup and reduces the dead corner stagnation in the material cavity.
[0020] Preferably, the stirring rib is an annular protrusion, and multiple annular protrusions are arranged at intervals along the axial direction of the main rib.
[0021] Through the above technical solution, multiple annular protruding stirring components rotate to form multi-level annular shear surfaces, which continuously squeeze and stir the makeup material in the material cavity, causing the makeup material to be squeezed and replaced in the gaps between the annular protrusions, further enhancing the dispersion effect of the lip gloss and optimizing the mixing uniformity.
[0022] Preferably, the extending direction of the stirring rib is spirally arranged relative to the main rib.
[0023] Through the above technical solution, the spiral arc-shaped stirring ribs form a continuous spiral shear surface during the stirring process, which expands the stirring effect of the stirring component on the paste, and forms a vortex extrusion and axial flow effect in the material cavity, thus optimizing the stirring uniformity.
[0024] Preferably, the outer wall of the agitator is provided with a plurality of recessed grooves, and the agitator forms a gap with the cavity wall of the material chamber through the recessed grooves.
[0025] Through the above technical solution, when the agitator rotates and moves axially, the recessed groove forms a dynamic gap channel with the material cavity wall, which promotes the flow of the material along the recessed groove, thereby promoting the flow and exchange of the material and further reducing the dead corner stagnation in the material cavity.
[0026] Preferably, the outer cover has a mounting cavity, the pressure cap is fitted into the opening end of the mounting cavity, the pressure cap is fitted with a mounting sleeve, the mounting sleeve is fixed to the outer cover by a snap-fit structure, the outer edge of the pressure cap has a fixing part protruding, and the pressure cap is restricted from falling out by the fixing part abutting against the mounting sleeve.
[0027] The above technical solution involves embedding one end of the pressure cap with a fixing part through the opening end of the mounting cavity, and then mounting the mounting sleeve onto the pressure cap. The mounting sleeve is fixed to the outer cover through a snap-fit structure, and the fixing part is restricted from axial dislodgement by the inner edge of the mounting sleeve, thereby realizing the installation of the pressure cap and improving the overall integrity of the component.
[0028] Preferably, the cap is rotatably disposed relative to the bottle body, and the outer cap has a plurality of snap-fit protrusions distributed circumferentially along the inner wall. A snap-fit groove is formed between adjacent snap-fit protrusions. The fixing part has a corresponding snap-fit part protruding out. The snap-fit parts are fitted into the snap-fit grooves one by one. The outer cap drives the pressure cap and the brush rod to rotate. The brush rod is used to drive the stirring component to rotate in the material chamber.
[0029] Through the above technical solution, the rotation of the outer cap can drive the pressure cap to rotate synchronously, and the pressure cap drives the brush rod to rotate. The limiting part on the outer wall of the brush rod and the limiting groove are linked through the interlocking relationship. The limiting part pushes against the wall of the limiting groove to form circumferential transmission, driving the stirring component to rotate together with the brush rod in the material cavity. During the rotation of the stirring component, the lip gloss in the bottle is mechanically stirred. The brush head at the front end of the brush rod continuously contacts the stirred paste during the rotation, achieving synchronous and uniform dipping. This design adds a rotational stirring function on the basis of axial stirring, forming a dual stirring effect and improving the ease of use.
[0030] The key and beneficial technical effects of this technical solution compared to existing technologies are:
[0031] 1. This technical solution achieves the reciprocating mixing function of the mixing component by pressing or releasing the cap. The cap moves the mixing component through the limiting structure between the brush rod and the mixing component. The telescopic section of the mixing component is axially compressed for one mixing, and extends in the opposite direction for a second mixing when the cap is released. This makes the mixing operation of the makeup more convenient and easy to use.
[0032] 2. This technical solution uses a single-sided through-hole to limit the groove. The limiting part is embedded in the limiting groove through the through-hole. When pressed, the axial thrust is transmitted through the contact surface to ensure the transmission of thrust to the stirring component and realize the pushing of the stirring component.
[0033] 2. This technical solution uses the linkage between the brush rod and the stirring component through the fitting of the limiting part in the limiting groove, so that the stirring component is driven to rotate synchronously when the cover is rotated to perform mechanical stirring. At the same time, the brush head evenly picks up the cream during rotation, realizing the stirring and picking functions simultaneously. The dual stirring combination further improves the uniformity of the makeup mixture. Attached Figure Description
[0034] Figure 1 This is a schematic diagram of the overall structure of this embodiment;
[0035] Figure 2 This is a partial structural diagram of the bottle in Example 1 with the bottle body partially obscured;
[0036] Figure 3 This is a partial structural diagram of the cover and brush rod in Example 1;
[0037] Figure 4 This is a partial cross-sectional view of the stirring component in Example 1;
[0038] Figure 5 This is one of the partial cross-sectional schematic diagrams of Example 1;
[0039] Figure 6 This is the second partial cross-sectional view of Example 1;
[0040] Figure 7 This is a schematic diagram of the overall structure of the stirring component in Example 2.
[0041] Reference numerals: 1. Bottle body; 2. Cap; 21. Outer cap; 22. Press cap; 3. Material chamber; 4. Brush rod; 5. Recessed groove; 6. Stirring component; 61. Telescopic section; 62. Agitating section; 621. Main rib; 622. Agitating rib; 6221. Annular protrusion; 7. Guide protrusion; 8. Limiting groove; 9. Limiting part; 10. Cavity; 11. Elastic component; 12. Abutment surface; 13. Mounting cavity; 14. Fixing part; 15. Mounting sleeve; 16. Snap-fit protrusion; 17. Snap-fit groove; 18. Snap-fit part; 19. Material passage hole; 20. Brush head. Detailed Implementation
[0042] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.
[0043] Example:
[0044] See Figure 1 A stirring cosmetic bottle, which is cylindrical in shape, includes a bottle body 1 and a cap body 2. The bottle body 1 and the cap body 2 are arranged along the axial direction. The bottle body 1 has a material cavity 3 for containing cosmetic materials. The cap body 2 includes an outer cap 21 and a pressure cap 22. The outer cap 21 is threadedly connected to the bottle body 1. The pressure cap 22 is embedded inside the outer cap 21, and the top of the pressure cap 22 protrudes from the outer cap 21.
[0045] See Figure 3 and Figure 5 The outer cover 21 is provided with an installation cavity 13, which extends through the side opposite to the connection position of the bottle body 1. An installation sleeve 15 is fitted on the outer side of the pressure cap 22. The cross-sectional dimensions of the installation sleeve 15 are adapted to the channel interface of the installation cavity 13. The installation sleeve 15 and the outer cover 21 are connected by a snap-fit structure. In this embodiment, the snap-fit structure can be provided with an annular groove 1 and a protruding ring 1 around the outer peripheral wall of the installation sleeve 15, and an annular groove 2 and a protruding ring 2 around the inner peripheral wall of the installation cavity 13. The installation sleeve 15 is inserted into the installation cavity 13 from the through end. When installed in the designated position, the annular groove 1 and the protruding ring 2 are engaged, and the protruding ring 1 is correspondingly engaged in the annular groove 2, thereby restricting the installation sleeve 15 from being dislodged from the installation cavity 13 axially.
[0046] The pressure cap 22 has a fixing part 14, which protrudes from the outer edge of the pressure cap 22. The end face of the fixing part 14 near the mounting sleeve 15 abuts against the corresponding side of the mounting sleeve 15, thereby preventing the pressure cap 22 from detaching. The pressure cap 22 is slidably disposed on the outer cover 21. Several snap-fit protrusions 16 are distributed circumferentially along the inner wall of the mounting cavity 13. The length direction of each snap-fit protrusion 16 is consistent with the sliding direction of the pressure cap 22. A snap-fit groove 17 is formed between each adjacent snap-fit protrusion 16, and each snap-fit groove 17 passes through the opening end of the mounting cavity 13. The fixing part 14 Several snap-fit parts 18 protrude along the outer peripheral wall, the number of which is less than or equal to the number of snap-fit slots 17. To further explain, the number of snap-fit parts 18 is less than the number of snap-fit slots 17. The distribution position of all snap-fit parts 18 can correspond one-to-one with the distribution position of multiple sets (located at different circumferential angles) of snap-fit slots 17, so that multiple snap-fit parts 18 can be simultaneously embedded in any set of snap-fit slots 17 without the need for precise alignment of a single position, thus improving installation efficiency. While ensuring that the pressure cover 22 can slide relative to the sliding cover, it also ensures that the pressure cover 22 and the outer cover 21 can rotate synchronously.
[0047] It also includes a brush rod 4, one rear end of which is embedded in the cap 22, and the other front end has a brush head 20. The brush head 20 extends toward the bottle body 1 and into the material cavity 3. The material of the brush head 20 can be flexible bristles or other absorbent materials. An elastic element 11 is provided between the cap 22 and the outer cap 21. The elastic element 11 is preferably a return spring. One end of the elastic element 11 abuts against the outer cap 21 (the bottom of the mounting cavity 13), and the other end abuts against the brush rod 4 and the cap 22. Based on the relative stability of the outer cap 21 and the sliding movement of the cap 22, the elastic force of the elastic element 11 pushes the brush rod 4 and the cap 22 to slide outward. In the natural state (not pressed), when the elastic element 11 pushes the brush rod 4 and the cap 22 to the extreme position, the fixing part 14 on the cap 22 abuts against the mounting sleeve 15. At this time, the end of the cap 22 protrudes from the outer cap 21, forming a position that can be pressed by the user.
[0048] See Figure 2 , Figure 4 and Figure 6 It also includes a stirring component 6, which is cylindrical in shape and is a hollow tube with an internal cavity 10. The stirring component 6 is installed in the material cavity 3. The installation method shown in this embodiment can be achieved by inserting the stirring component 6 through the opening of the material cavity 3 and then installing the bottle cap when the bottle body 1 has a detachable bottle cap.
[0049] The mixing component 6 includes an integrally connected telescopic section 61 and a stirring section 62. The telescopic section 61 has a structure similar to a spring and extends spirally along the axial direction. The telescopic section 61 is installed closer to the bottom of the material chamber 3 than the stirring section 62. The stirring section 62 includes a main rib 621 and a stirring rib 622. The stirring rib 622 is configured with a plurality of annular protrusions 6221. The plurality of annular protrusions 6221 are arranged at intervals along the axial direction of the main rib 621. The main body has a material passage hole 19. The outer wall of the mixing component 6 is provided with a plurality of recessed grooves 5, so that the recessed grooves 5 on the outer wall of the stirring rib 622 and the annular protrusions 6221 form gaps with the cavity wall of the material chamber 3. These gaps and the material passage hole 19 on the main rib 621 together form a channel for the flow of cosmetic materials.
[0050] The brush rod 4 passes through the cavity 10 of the stirring component 6. A limiting structure is provided between the brush rod 4 and the stirring component 6. The limiting structure includes guide protrusions 7 and limiting parts 9. Several limiting parts 9 protrude along the outer peripheral wall of the brush rod 4. Several guide protrusions 7 are distributed circumferentially along the inner wall of the cavity 10. The length direction of each guide protrusion 7 is consistent with the insertion direction of the brush rod 4. A limiting groove 8 is formed between each adjacent guide protrusion 7. Each limiting groove 8 is through to the side facing the installation direction of the brush rod 4. Each limiting groove 8 has an abutment surface 12 on the side opposite to the through end. The number of limiting parts 9 is less than or equal to the number of limiting grooves 8. The distribution position of all limiting parts 9 can correspond one-to-one with the distribution position of multiple sets (located at different circumferential angles) of limiting grooves 8, so that multiple limiting parts 9 can be embedded in any set of limiting grooves 8 at the same time without the need for precise alignment of a single position, which improves the installation efficiency and ensures that the brush rod 4 and the stirring component 6 can rotate synchronously.
[0051] During operation, pressing the cap 22 causes it to slide downward relative to the outer cap 21, simultaneously moving the brush rod 4 downward. Since the limiting part 9 of the brush rod 4 abuts against the corresponding contact surface 12, this contact action pushes the stirring component 6 downward. One end of the telescopic section 61 abuts against the inner wall of the material cavity 3. The downward movement compresses the telescopic section 61, causing axial compression. Multiple annular protrusions 6221 on the stirring section 62 then displace, causing the makeup material to be squeezed and displaced within the gaps between the annular protrusions 6221, achieving single-pass stirring of the makeup material. After releasing the pressing force, the elastic element 11 pushes the brush rod 4 and cap 22 back to their original positions. At this time, the compression section extends and resets, and in conjunction with the annular protrusions 6221, it moves in the opposite direction, stirring the makeup material again. By repeatedly pressing, multiple reciprocating stirrings along the axial (vertical) direction of the material cavity 3 can be achieved.
[0052] The outer cover 21 can also be rotated. The outer cover 21 drives the pressure cover 22 to rotate through the engagement of the snap-fit part 18 and the snap-fit groove 17. The pressure cover 22 drives the brush rod 4 connected to it to rotate synchronously. The brush rod 4 drives the stirring part 6 to rotate in the material cavity 3 through the engagement of the limiting groove 8 and the limiting part 9, thereby realizing rotary stirring. The degree of stirring and mixing of rotary stirring is less than that of axial stirring, which further improves the degree of mixing of the cosmetic.
[0053] The specific work process of this plan is as follows:
[0054] This technical solution involves pressing the cap 22, causing the brush rod 4 to push against the contact surface 10 of the inner wall of the limiting groove 8 through the limiting part 9. This axially pushes the stirring element 6 in the material chamber 3 downward, causing the telescopic section 61 on the stirring element 6 to undergo axial compression deformation. The telescopic section 61 and the stirring section 62 vertically stir the lip gloss in the bottle. After releasing the cap 22, the elastic element 11 pushes the cap 22 and the brush rod 4 back to their original positions. The telescopic section 61 also rebounds and stirs the makeup again in the opposite direction. This process is repeated, and the stirring element 6 stirs the makeup up and down repeatedly, achieving thorough stirring. This makes the stirring operation of the makeup more convenient and easy to use.
[0055] Example 2:
[0056] See Figure 7 A stirring cosmetic bottle, which differs from Embodiment 1 in that the extending direction of the stirring rib 622 is an arc shape with a spiral arrangement relative to the main rib 621, and its spiral direction is opposite to the spiral direction of the telescopic section 61.
[0057] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.
Claims
1. A stirring cosmetic bottle, comprising a bottle body (1) having a cavity (3) for containing cosmetic materials, characterized in that, Also includes: A stirring component (6) is movably installed in the material cavity (3). The stirring component (6) includes a telescopic section (61) extending spirally around its axis and an agitating section (62) disposed in the telescopic section (61). One end of the telescopic section (61) abuts against the inner wall of the material cavity (3). The cover (2) includes an outer cover (21) and a pressure cap (22) that slides on the outer cover (21), the pressure cap (22) being provided with a brush rod (4), the front end of the brush rod (4) extending to the stirring member (6); An elastic element (11) is disposed between the outer cover (21) and the pressure cap (22), the elastic force of the elastic element (11) causing the pressure cap (22) to tend to move out relative to the outer cover (21); A limiting structure is provided between the brush rod (4) and the stirring section (62). When the pressure cap (22) is pressed to push the brush rod, the brush rod (4) pushes the stirring section (62) axially through the limiting structure, which is used to force the telescopic section (61) to compress axially.
2. The stirring cosmetic bottle according to claim 1, characterized in that: The limiting structure includes guide protrusions (7) and limiting parts (9). The inner wall of the stirring section (62) is provided with a plurality of guide protrusions (7) along the circumferential direction. A limiting groove (8) is formed between adjacent guide protrusions (7). The limiting parts (9) protrude from the outer wall of the brush rod (4). The limiting groove (8) extends through the side away from the telescopic section (61), and the side of the limiting groove (8) opposite to the through end has an abutment surface (12). The limiting part (9) is fitted into the through end of the limiting groove (8) one by one, and the limiting part (9) can abut against the abutment surface (12).
3. A stirring cosmetic bottle according to claim 2, characterized in that: The number of the limiting slots (8) is greater than the number of limiting parts (9), and the limiting parts (9) can be fitted to different limiting slots (8).
4. A stirring cosmetic bottle according to claim 2, characterized in that: The stirring component (6) is a hollow tube with an internal cavity (10). The stirring section (62) includes a main rib (621) and several stirring ribs (622) arranged on the outside of the main rib (621). The main rib (621) has a material passage hole (19). The main rib (621) is provided with the guide protrusion (7) near the inner wall of the cavity (10).
5. A stirring cosmetic bottle according to claim 4, characterized in that: The stirring rib (622) is an annular protrusion (6221), and multiple annular protrusions (6221) are arranged at intervals along the axial direction of the main rib (621).
6. A stirring cosmetic bottle according to claim 4, characterized in that: The extension direction of the stirring rib (622) is spirally arranged relative to the main rib (621).
7. A stirring cosmetic bottle according to claim 4, characterized in that: The outer walls of the telescopic section (61) and the stirring rib (622) are provided with a number of recessed grooves (5), and the recessed grooves (5) form gaps with respect to the cavity wall of the material cavity (3).
8. A stirring cosmetic bottle according to claim 1, characterized in that: The outer cover (21) is provided with an installation cavity (13), and the pressure cap (22) is fitted into the opening end of the installation cavity (13). The pressure cap (22) is fitted with an installation sleeve (15), and the installation sleeve (15) is fixed to the outer cover (21) by a snap-fit structure. The outer edge of the pressure cap (22) has a fixing part (14) protruding, and the pressure cap (22) is restricted from falling out by the fixing part (14) and the installation sleeve (15).
9. A stirring cosmetic bottle according to claim 8, characterized in that: The cap (2) is rotatably disposed relative to the bottle (1). The outer cap (21) has a plurality of snap-fit protrusions (16) distributed circumferentially along the inner wall. A snap-fit groove (17) is formed between adjacent snap-fit protrusions (16). The fixing part (14) has a corresponding snap-fit part (18). The snap-fit part (18) is fitted into the snap-fit groove (17) one by one. The outer cap (21) drives the pressure cap (22) and the brush rod (4) to rotate. The brush rod (4) is used to drive the stirring component (6) to rotate in the material chamber (3).