CN113712835B

CN113712835B - Cleansing oil containing astaxanthin liposome and preparation method thereof

Info

Publication number: CN113712835B
Application number: CN202111160648.1A
Authority: CN
Inventors: 池水兴; 许晓婷
Original assignee: Qianyan Cosmetics Technology Shanghai Co ltd
Current assignee: Qianyan Cosmetics Technology Shanghai Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2023-06-23
Anticipated expiration: 2041-09-30
Also published as: CN113712835A

Abstract

The invention discloses cleansing oil containing astaxanthin liposome, which comprises liposome, astaxanthin and a preparation with high skin affinity, and the preparation method of the cleansing oil provided by the invention comprises the following steps: s1, weighing the raw materials according to the formula amount; s2, mixing the cetyl alcohol ethyl caproate, squalane, pentaerythritol tetra (di-tert-butyl hydroxy hydrocinnamate), polyglycerol-6 dicaprate, polyglycerol-2 caprate, liposome and dopamine at 45-60 ℃ to obtain a phase A; s3, mixing astaxanthin with the A phase to obtain the B phase, and coating the B phase with a preparation with high skin affinity to obtain the cleansing oil with multi-level face cleaning effect, wherein the step S3 adopts the following equipment: the matched processing equipment provided by the invention has strong practicability and can ensure the quality of the cleansing oil obtained by processing.

Description

Cleansing oil containing astaxanthin liposome and preparation method thereof

Technical Field

The invention relates to the technical field of makeup removing oil manufacture, in particular to makeup removing oil containing astaxanthin liposome and a preparation method thereof.

Background

The cleaning is the first step of skin care, so that the cleaning and cleansing of makeup is of great significance, not only is makeup on the surface of skin removed and dirt in pores removed, but also the skin can keep acid-base balance, the stratum corneum is softened, and the metabolism capability is enhanced. The cleansing in the narrow sense can only remove dirt on the skin surface, cannot clean deeply, and can influence the skin to absorb skin care products. Some people need to remove heavy makeup and greasiness on the face before the early 20 th century, but some infant oil or other grease is generally used, the idea of removing the makeup by oil-soluble oil is good, the makeup can be well removed, but the new greasiness is troublesome to clean, and a large amount of grease can block skin pores. Until 1960, the majordomo planted in japan witnessed the actor to remove the heavy makeup with grease during the work, however, the grease is not easy to clean, so that the component of an emulsifying agent is added into the makeup removing oil, the oil can be easily combined with the makeup and greasy dirt on the skin, and the dirt on the skin can be completely removed during the flushing in a water emulsifying mode.

The existing cleansing oil cannot clean oil dirt on the face of the skin and has poor practicability. Therefore, it is necessary to design a cleansing oil containing astaxanthin liposome and a preparation method thereof.

Disclosure of Invention

The invention aims to provide cleansing oil containing astaxanthin liposome and a preparation method thereof, which are used for solving the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme:

the cleansing oil containing astaxanthin liposome comprises the following components in parts by mass: 50 to 85 parts of cetyl alcohol ethyl caproate, 5 to 35 parts of squalane, 0.03 to 0.1 part of pentaerythritol tetra (di-tert-butyl hydroxy hydrocinnamate), 1.5 to 4 parts of polyglycerol-6 dicaprate, 5.5 to 8.5 parts of polyglycerol-2 caprate, 70 to 100 parts of liposome, 0.1 to 1 part of astaxanthin, 0.02 to 0.07 part of dopamine and 0.3 to 2 parts of high skin affinity preparation.

The addition of dopamine can exert the special effect of self-assembly of oxidation during use, provide good film forming effect, and also prolong the effective action time of easily-oxidized components such as astaxanthin in the cleansing oil.

Furthermore, the high skin affinity preparation is targeting functional substances and bacterial cellulose according to the mass ratio of 30-50: 1. The bacterial cellulose has high water absorption efficiency, and can be well dispersed in the hexacyclic stone component negative ions in the preparation with high skin affinity, so that the skin is cleaned and the deep water is supplied.

Still further, the targeting function: according to the mass ratio of 1: 8-13: 2-5, mixing the tetrahydropyrimidine carboxylic acid, water and hexacyclic stone micro powder, carrying out heat preservation and vibration at 40-55 ℃, and heating to 100 ℃ to remove water.

The tetrahydropyrimidine carboxylic acid used in the invention can play a role of chemical transmitter in cells, has a stable protection effect on cells in a reverse environment, can stabilize the structure of enzyme proteins in organisms, has a skin-activating and anti-aging function, can provide good moisturizing and whitening functions, has extremely strong water molecule complexing capability, and can complex four to five skin free water molecules by one tetrahydropyrimidine carboxylic acid molecule, so that skin fine bubble free water is structured and continuously locks moisture. The hexacyclic ring stone has the functions of resisting aging, eliminating free radical in human body, releasing far infrared ray, inducing resonance of facial cell atoms and molecules after penetrating into face, inducing thermal reaction by friction heat between molecules, expanding deep subcutaneous layer, accelerating blood circulation, eliminating vascular accumulation, eliminating harmful matter and oil dirt, activating tissue cell, preventing aging and strengthening immunity. Negative ions generated by the hexacyclic ring stone can also improve the balance of facial microcirculation, promote metabolism of human bodies and have various health care effects.

According to the invention, the tetrahydromethylpyrimidine carboxylic acid is compounded with the hexacyclic stone micro powder, so that the targeted cleaning effect on facial skin is achieved, a large amount of anions are generated by the hexacyclic stone in the processes of heat preservation, vibration, heating and dehydration, and the hexacyclic stone micro powder is cooperated with the tetrahydromethylpyrimidine carboxylic acid, and can be used for cleaning and removing deep oil dirt under the action of facial warmth while keeping water.

Further, the grain size of the hexacyclic fine stone powder is 100-250 mu m. The small-particle-size hexacyclic stone micropowder better fits the use of the face (the average face skin is 50-150 mu m), provides proper and sufficient negative ions, and has the effects of cleaning the face and improving microcirculation.

According to the technical scheme, the preparation method comprises the following preparation steps:

s1, weighing the raw materials according to the formula amount;

s2, mixing the cetyl alcohol ethyl caproate, squalane, pentaerythritol tetra (di-tert-butyl hydroxy hydrocinnamate), polyglycerol-6 dicaprate, polyglycerol-2 caprate, liposome and dopamine at 45-60 ℃ to obtain a phase A;

s3, mixing the astaxanthin with the phase A to obtain phase B, and coating the phase B with the preparation with high skin affinity to obtain the cleansing oil containing the astaxanthin liposome.

According to the technical scheme, the following equipment is adopted in the step S3: including processing shell (1), processing shell (1) comprises interconnect's semicircle shell (11) and arc shell (12), hydraulic pump (61) are installed to the top inner wall of semicircle shell (11), the inside of processing shell (1) is through welded fastening has spliced pole (3), gyration cylinder (4) are installed to the one end of spliced pole (3), gyration cylinder (4) are two of stacking from top to bottom, and the output of two gyration cylinders (4) is connected with branch (41) respectively, the one end of branch (41) has roll-in post (42) through bearing swing joint, the through-hole has been seted up to the outer wall of roll-in post (42), and the inside of through-hole is filled with astaxanthin, the top of gyration cylinder (4) is connected with column cap (31), the diameter of column cap (31) is the same with spliced pole (3), pouring head (421) are installed to the bottom of roll-in post (42).

According to the technical scheme, the one end of roll-in post is through welded fastening there being the motor, the output shaft of motor has the clamp plate of pacifying through the coupling joint, the nail form tooth is evenly installed to one side of pacifying the clamp plate, pacify the shape and the arc shell looks adaptation of clamp plate, pacify clamp plate and roll-in post through bearing swing joint.

According to the technical scheme, the coating hole has evenly been seted up to one side of arc shell, one side of spliced pole is through welded fastening has the holding tank, one side of holding tank corresponds installs flexible cover, one side of flexible cover contacts with the inner wall of arc shell, the spout has been seted up to the top periphery circle department of spliced pole to be the annular, the inside slip of spout is provided with the arc baffle, and is connected with the spring between two arc baffles, be provided with high skin affinity preparation in the holding tank, the upper and lower both sides of arc baffle contact with spliced pole and column head, the top of arc baffle contacts with the arc baffle.

According to the above technical solution, the step S3 includes:

s1-1, starting a hydraulic pump (61) to enable an A phase in a storage cavity (6) to be pumped into a spray head (62), and enabling the A phase to slowly flow down along a semicircular shell (11);

s1-2, rotating a rotary cylinder (4) to enable a rolling column (42) to roll along the outer wall of a semicircular shell (11), rolling the phase A, and enabling astaxanthin in the through hole to be mixed with the phase A to obtain phase B;

s1-3, starting a motor (43) to enable an output shaft of the motor to rotate, driving the angle of the pressing plate (2) to change, and enabling the spike-shaped teeth (21) to drive the B phase to slide onto the arc-shaped shell (12);

s1-4, starting a rotary cylinder (4) to enable a supporting rod (41) to swing up and down, extruding an arc-shaped baffle plate (32) downwards, increasing the pressure in a containing groove (5), extruding a high-skin-affinity preparation from a flexible sleeve (51) into a coating hole (121), and coating the preparation on a B phase.

According to the technical scheme, the filter screen is arranged on the inner wall of the accommodating groove.

According to the technical scheme, the distance between the rolling column and the semicircular shell is two centimeters.

According to the technical scheme, the polyurethane lubricating coating is uniformly coated on the surface of the arc-shaped shell.

According to the technical scheme, the rolling column is made of elastic rubber.

Compared with the prior art, the invention has the following beneficial effects: the cleansing oil provided by the invention has the effect of cleaning the face in multiple layers, the practicability of matched processing equipment is high, the quality of the cleansing oil obtained by processing can be ensured, the coating of the A-phase coated astaxanthin and the preparation with high skin affinity is combined, and the working efficiency is improved.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of a partial structure of the present invention;

in the figure: 1. processing the shell; 11. a semicircular shell; 12. an arc-shaped shell; 121. coating the holes; 2. a pressing plate; 21. spike-like teeth; 3. a middle column; 31. column head; 32. an arc baffle; 33. a chute; 34. a spring; 4. a revolving cylinder; 41. a support rod; 42. a roller press column; 43. a motor; 5. a receiving groove; 51. a flexible sleeve; 52. a filter screen; 6. a storage chamber; 61. a hydraulic pump; 62. a spray head; 421. and (3) a perfusion head.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-3, the present invention provides the following technical solutions: a cleansing oil containing astaxanthin liposome comprises liposome, astaxanthin, and high skin affinity preparation, wherein the skin comprises epidermis layer, horny layer, and transparent layer, and can clean oil dirt of skin for multiple times during use to strengthen active substances; the cleansing oil provided by the invention accords with the standard GB/T35914 (I type).

Specifically, the composition comprises the following components in parts by weight: 50 to 85 parts of cetyl alcohol ethyl caproate, 5 to 35 parts of squalane, 0.03 to 0.1 part of pentaerythritol tetra (di-tert-butyl hydroxy hydrocinnamate), 1.5 to 4 parts of polyglycerol-6 dicaprate, 5.5 to 8.5 parts of polyglycerol-2 caprate, 70 to 100 parts of liposome, 0.1 to 1 part of astaxanthin, 0.02 to 0.07 part of dopamine and 0.3 to 2 parts of high skin affinity preparation.

Furthermore, the high skin affinity preparation is targeting functional substances and bacterial cellulose according to the mass ratio of 30-50: 1.

Further, the grain size of the hexacyclic fine stone powder is 100-250 mu m.

The preparation method of the cleansing oil containing astaxanthin liposome comprises the following preparation steps:

s1, weighing the raw materials according to the formula amount;

The process of step S3 employs the following equipment: the shrimp rolling machine comprises a machining shell (1), wherein the machining shell (1) is composed of a semicircular shell (11) and an arc-shaped shell (12) which are connected with each other, a hydraulic pump (61) is arranged on the inner wall of the top of the semicircular shell (11), a middle column (3) is fixedly arranged in the machining shell (1) through welding, a rotary cylinder (4) is arranged at one end of the middle column (3), the rotary cylinders (4) are two vertically stacked, the output ends of the two rotary cylinders (4) are respectively connected with a supporting rod (41), one end of each supporting rod (41) is movably connected with a rolling column (42) through a bearing, a through hole is formed in the outer wall of each rolling column (42), astaxanthin is filled in the through hole, a column head (31) is connected with the top of each rotary cylinder (4), the diameter of each column head (31) is the same as that of the middle column (3), and a filling head (421) is arranged at the bottom of each rolling column (42) and drives the supporting rods (41) to swing when the shrimp rolling column is used, so that the rolling column (42) can slowly mix astaxanthin with a high-viscosity phase A pumped by the hydraulic pump, and the astaxanthin can slowly permeate the rolling layer to form a rolling layer with the rolling layer when the shrimp rolling layer is mixed with the astaxanthin;

one end of the roller press column 42 is fixedly provided with a motor 43 through welding, an output shaft of the motor 43 is connected with a pressing plate 2 through a coupling, one side of the pressing plate 2 is uniformly provided with nail-shaped teeth 21, the shape of the pressing plate 2 is matched with that of the arc-shaped shell 12, the pressing plate 2 is movably connected with the roller press column 42 through a bearing, the motor 43 is started to enable the nail-shaped teeth 21 to be in contact with the A phase, the A phase is displaced by the nail-shaped teeth 21, the A phase can be stamped with a plurality of holes through the nail-shaped teeth 21, and the A phase can be thinned through reciprocating displacement of the pressing plate 2, so that the mixing is more sufficient;

a coating hole 121 is uniformly formed in one side of the arc-shaped shell 12, a containing groove 5 is fixedly formed in one side of the middle column 3 through welding, a flexible sleeve 51 is correspondingly arranged on one side of the containing groove 5, one side of the flexible sleeve 51 is contacted with the inner wall of the arc-shaped shell 12, a sliding groove 33 is formed in the peripheral circle of the top of the middle column 3, an arc-shaped baffle 32 is slidably arranged in the sliding groove 33, a spring 34 is connected between the two arc-shaped baffles 32, a high skin affinity preparation is arranged in the containing groove 5, the upper side and the lower side of the arc-shaped baffle 32 are contacted with the middle column 3 and the column head 31, the top of the arc-shaped baffle 32 is contacted with the arc-shaped baffle 32, the chamber pressure of the middle column 3 can be adjusted by utilizing the reciprocating rotation of the supporting rod 41, the arc-shaped baffle 32 is close to the middle when the arc-shaped baffle 32 is rotated downwards, so that the arc-shaped baffle 32 is compressed, the skin affinity preparation in the containing groove 5 is extruded into the flexible sleeve 51 by the pressure, and the supply of the high skin affinity preparation and the extrusion of the phase A are synchronously carried out, and the mixing effect is better;

the step S3 includes:

s1-4, starting a rotary cylinder (4) to enable a supporting rod (41) to swing up and down, extruding an arc-shaped baffle plate (32) downwards to enable the pressure in a containing groove (5) to be increased, extruding a high-skin-affinity preparation into a coating hole (121) from a flexible sleeve (51) to coat the high-skin-affinity preparation on a B phase, forming the A phase by using the process, mixing astaxanthin with the A phase and mixing the high-skin-affinity preparation, and enabling three processes to be carried out in one station, so that insufficient mixing caused by oxidation of the A phase is prevented, and astaxanthin is better contained;

the inner wall of the accommodating groove 5 is provided with a filter screen 52, and the filter screen 52 can prevent the filling liquid in the accommodating groove from flowing back while penetrating into the air;

the distance between the roller 42 and the semicircular shell 11 is two centimeters, and the two centimeters are the suggested thickness of the A phase;

the surface of the arc-shaped shell is uniformly coated with a polyurethane lubricating coating, so that the sliding smooth performance of the arc-shaped shell is improved, and the service life of the arc-shaped shell is prolonged;

the roller press column is made of elastic rubber, so that the roller press column has higher elastic deformation capability, and the roller press column is flexible to use.

Example 1

The cleansing oil containing astaxanthin liposome comprises the following components in parts by mass: 50 parts of cetyl ethyl hexanoate, 5 parts of squalane, 0.03 part of pentaerythritol tetrakis (di-tert-butylhydroxyhydrocinnamate), 1.5 parts of polyglycerol-6-dicaprate, 5.5 parts of polyglycerol-2-decanoate, 70 parts of liposomes, 0.1 part of astaxanthin, 0.02 part of dopamine, 0.3 part of a high skin affinity preparation.

The high skin affinity preparation is prepared from a targeting functional substance and bacterial cellulose according to a mass ratio of 30: 1.

The targeting function: according to the mass ratio of 1:8:2, mixing the tetrahydropyrimidine carboxylic acid, water and the hexacyclic fine powder, carrying out heat preservation and vibration at 40 ℃, and heating to 100 ℃ to remove water.

The grain diameter of the hexacyclic fine stone powder is 100-250 mu m.

Example 2

The cleansing oil containing astaxanthin liposome comprises the following components in parts by mass: 85 parts of cetyl ethyl hexanoate, 35 parts of squalane, 0.1 part of pentaerythritol tetrakis (di-tert-butylhydroxyhydrocinnamate), 4 parts of polyglycerol-6-dicaprate, 8.5 parts of polyglycerol-2-decanoate, 100 parts of liposome, 1 part of astaxanthin, 0.07 part of dopamine and 2 parts of a high skin affinity preparation.

The high skin affinity preparation is prepared from a targeting functional substance and bacterial cellulose according to a mass ratio of 50: 1.

The targeting function: according to the mass ratio of 1:13:5, mixing the tetrahydropyrimidine carboxylic acid, water and the hexacyclic fine powder, carrying out heat preservation and vibration at 55 ℃, and heating to 100 ℃ to remove water.

The grain diameter of the hexacyclic fine stone powder is 100-250 mu m.

Example 3

The cleansing oil containing astaxanthin liposome comprises the following components in parts by mass: 75 parts of cetyl ethyl hexanoate, 25 parts of squalane, 0.08 part of pentaerythritol tetrakis (di-tert-butylhydroxyhydrocinnamate), 3 parts of polyglycerol-6 dicaprate, 7.5 parts of polyglycerol-2 decanoate, 90 parts of liposomes, 0.7 part of astaxanthin, 0.06 part of dopamine, 1.2 parts of a high skin affinity preparation.

The high skin affinity preparation is prepared from a targeting functional substance and bacterial cellulose according to a mass ratio of 40: 1.

The targeting function: according to the mass ratio of 1:10: and 3, mixing the tetrahydropyrimidine carboxylic acid, water and the hexacyclic fine powder, performing heat preservation and vibration at 50 ℃, and heating to 100 ℃ to remove water.

The grain diameter of the hexacyclic fine stone powder is 100-250 mu m.

Comparative example 1 was essentially identical to the protocol of example 1, except for the lack of a high skin affinity formulation.

Comparative example 2 is essentially identical to the protocol of example 1, with the exception of the lack of dopamine.

The cleansing oil prepared according to the formulas of examples 1-3 and comparative examples 1 and 2 was evaluated for use effect, the number of persons involved in the evaluation was 20, the average of each item was shown in the following table, and the results are shown in the following table

From the above table, the cleansing oil provided by the invention has stable and good trial effect, and can be used in different degrees when the cleansing oil lacks a preparation with high skin affinity and dopamine components.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The cleansing oil containing astaxanthin liposome is characterized by comprising the following components in parts by weight: 50 to 85 parts of cetyl alcohol ethyl caproate, 5 to 35 parts of squalane, 0.03 to 0.1 part of pentaerythritol tetra (di-tert-butyl hydroxy hydrocinnamate), 1.5 to 4 parts of polyglycerol-6 dicaprate, 5.5 to 8.5 parts of polyglycerol-2 caprate, 70 to 100 parts of liposome, 0.1 to 1 part of astaxanthin, 0.02 to 0.07 part of dopamine and 0.3 to 2 parts of high skin affinity preparation;

the high skin affinity preparation is targeting functional substances and bacterial cellulose according to the mass ratio of 30-50: 1, a composition of matter of formula 1;

the targeting function: according to the mass ratio of 1: 8-13: 2-5, mixing the tetrahydropyrimidine carboxylic acid, water and hexacyclic stone micro powder, carrying out heat preservation and vibration at 40-55 ℃, and heating to 100 ℃ to remove water;

the grain diameter of the hexacyclic fine stone powder is 100-250 mu m;

the preparation method comprises the following steps:

s1, weighing the raw materials according to the formula amount;

s3, mixing astaxanthin with the phase A to obtain phase B, and coating the phase B with a preparation with high skin affinity to obtain cleansing oil containing astaxanthin liposome;

the step S3 adopts the following equipment: the novel hydraulic pump is characterized by comprising a processing shell (1), wherein the processing shell (1) is composed of a semicircular shell (11) and an arc-shaped shell (12) which are connected with each other, a hydraulic pump (61) is installed on the inner wall of the top of the semicircular shell (11), a middle column (3) is fixedly welded in the processing shell (1), a rotary cylinder (4) is installed at one end of the middle column (3), the rotary cylinders (4) are vertically stacked, the output ends of the two rotary cylinders (4) are respectively connected with a supporting rod (41), one end of each supporting rod (41) is movably connected with a rolling column (42) through a bearing, a through hole is formed in the outer wall of each rolling column (42), astaxanthin is filled in the through hole, a column head (31) is connected with the top of each rotary cylinder (4), the diameter of each column head (31) is identical to that of the middle column (3), and a filling head (421) is installed at the bottom of each rolling column (42);

one end of the rolling column (42) is fixedly provided with a motor (43) through welding, an output shaft of the motor (43) is connected with a pressing plate (2) through a coupler, nail-shaped teeth (21) are uniformly arranged on one side of the pressing plate (2), the shape of the pressing plate (2) is matched with that of the arc-shaped shell (12), and the pressing plate (2) is movably connected with the rolling column (42) through a bearing;

coating holes (121) are uniformly formed in one side of the arc-shaped shell (12), a containing groove (5) is fixedly formed in one side of the middle column (3) through welding, a flexible sleeve (51) is correspondingly arranged on one side of the containing groove (5), one side of the flexible sleeve (51) is contacted with the inner wall of the arc-shaped shell (12), a sliding groove (33) is formed in the peripheral circle of the top of the middle column (3), an arc-shaped baffle (32) is arranged in the sliding groove (33) in a sliding mode, a spring (34) is connected between the two arc-shaped baffles (32), a high skin affinity preparation is arranged in the containing groove (5), the upper side and the lower side of the arc-shaped baffle (32) are contacted with the middle column (3) and the column head (31), and the top of the arc-shaped baffle (32) is contacted with the arc-shaped baffle (32).

The specific steps in the step S3 are as follows:

s1-4, starting a rotary cylinder (4) to enable a supporting rod (41) to swing up and down, extruding an arc-shaped baffle plate (32) downwards to enable the pressure in a containing groove (5) to be increased, extruding a high-skin-affinity preparation from a flexible sleeve (51) into a coating hole (121) to enable the preparation to be coated on a B phase;

a filter screen (52) is arranged on the inner wall of the accommodating groove (5); the distance between the rolling column (42) and the semicircular shell (11) is 2cm; the surface of the arc-shaped shell is uniformly coated with a polyurethane lubricating coating; the roller press column is made of elastic rubber.