CN107375036B

CN107375036B - Soothing massage oil containing ginger root oil and preparation method thereof

Info

Publication number: CN107375036B
Application number: CN201710726357.1A
Authority: CN
Inventors: 陈曦
Original assignee: Wuhan Twink Life Health Industry Co ltd
Current assignee: Hubei Yuelai Bioengineering Co.,Ltd.
Priority date: 2017-08-22
Filing date: 2017-08-22
Publication date: 2020-09-29
Anticipated expiration: 2037-08-22
Also published as: CN107375036A

Abstract

The invention discloses a relieving massage oil containing ginger root oil and a preparation method thereof, wherein the relieving massage oil containing the ginger root oil comprises the following components in parts by weight: 5-15 parts of olive fruit oil, 5-15 parts of ginger root oil, 5-15 parts of squalane, 25-83.5 parts of mineral oil, 0.5-10 parts of hydrogenated almond oil, 0.5-10 parts of sweet almond oil and 0.5-10 parts of grape seed oil. The preparation method provided by the invention maximizes the effect of the ginger root oil through the synergistic cooperation of the components, can realize uniform mixing of the components, and can realize that the proportion of the components is basically unchanged in the preparation process.

Description

Soothing massage oil containing ginger root oil and preparation method thereof

Technical Field

The invention relates to the technical field of medicines. More specifically, the invention relates to a soothing massage oil containing ginger root oil and a preparation method thereof.

Background

The massage is a physical therapy method which is based on the theory of viscera and meridians of traditional Chinese medicine, combines the anatomical and pathological diagnosis of western medicine, and acts on specific parts of the body surface by hand to regulate the physiological and pathological conditions of the body so as to achieve the purpose of physical therapy. The massage oil combines massage manipulation to achieve the conditioning of various diseases or relieve pressure and the like, which is a current popular trend, but the massage oil products on the market are not good and good, so that many fake products exist, special people such as children and puerperae are not easy to contact unknown massage oil, the variety of the massage oil is various, and the massage oil capable of effectively relieving the symptoms of patients is few and few.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

The invention also aims to provide the relieving massage oil containing the ginger root oil and the preparation method thereof, the effect of the ginger root oil is maximized through the synergistic cooperation of all the components, meanwhile, the preparation method can realize the uniform mixing of all the components, the mixture ratio of all the components is basically not changed in the preparation process, and the stability of the prepared massage oil is ensured.

To achieve these objects and other advantages in accordance with the present invention, there is provided a soothing massage oil containing ginger root oil, comprising the following components in parts by weight: 5-15 parts of olive fruit oil, 5-15 parts of ginger root oil, 5-15 parts of squalane, 25-83.5 parts of mineral oil, 0.5-10 parts of hydrogenated almond oil, 0.5-10 parts of sweet almond oil and 0.5-10 parts of grape seed oil.

Preferably, the composition comprises the following components in parts by weight: 7-12 parts of olive fruit oil, 8-14 parts of ginger root oil, 7-12 parts of squalane, 38-72 parts of mineral oil, 2-8 parts of hydrogenated almond oil, 2-8 parts of sweet almond oil and 2-8 parts of grape seed oil.

Preferably, the composition comprises the following components in parts by weight: 8.7-10.5 parts of olive oil, 9.2-10.9 parts of ginger root oil, 8.7-10.5 parts of squalane, 47.1-61.4 parts of mineral oil, 4-7 parts of hydrogenated almond oil, 4-7 parts of sweet almond oil and 4-7 parts of grape seed oil.

Preferably, natural pigments are also included.

The invention also provides a preparation method of the relieving massage oil containing ginger root oil, which comprises the following steps:

the method comprises the following steps: olive fruit oil, ginger root oil, squalane, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil are respectively decolorized and filtered by activated clay for later use;

step two: the mixing container is of a square structure, the inner side walls and the bottom edges of the mixing container are provided with air blowing devices, the air blowing directions of the air blowing devices are perpendicular to the center of the mixing container, a suspended space is formed inside the mixing container by reasonably setting the air blowing size of the air blowing devices, all the components are uniformly mixed in the suspended space, all the components are not stuck to the inner wall of the mixing container, the air blowing devices continuously blow air, and the air blowing temperature is controlled according to the temperature required by the mixing container;

step three: respectively heating olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil to 50-60 ℃, then accurately adding the heated olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil into a mixing container in proportion to form a mixture A, respectively adding each component of the mixture A into the mixing container through different feed inlets, and controlling the respective adding speeds to control the simultaneous feeding of the components to be finished, wherein the temperature in the mixing container is 50-60 ℃;

step four: respectively heating ginger root oil and squalane to 50-60 ℃, respectively adding the mixture A into a mixing container through different feed inlets after the mixture A is uniformly mixed, and simultaneously finishing feeding to form a mixture B;

step five: after the mixture B is uniformly mixed, preserving the heat for 18-30 minutes;

step six: controlling the temperature of the blast device to raise the mixing temperature of the mixture B to 80-90 ℃, and then preserving the heat for 30-40 minutes;

step seven: controlling the temperature of the blast device to be reduced to 48-55 ℃, adding pigments through different feed inlets, and uniformly mixing;

step eight: and after controlling the temperature of the blast device to be continuously reduced to 25-35 ℃, closing the blast device arranged on the bottom edge of the mixing container, and discharging and subpackaging the mixture B from a discharge hole below the mixing container.

Preferably, the blowing device blows the charged gas to be inert gas, and blowing is carried out before charging so that the mixing container is always filled with the inert gas.

Preferably, the inner side wall and the bottom edge of the mixing container are coated with oil-repellent layers, each component is fed through a feeder and a feeding pipe which are provided with scales when being fed, and the inner walls of the feeder and the feeding pipe are coated with the oil-repellent layers.

Ginger root oil: improving common cold, phlegm, sore throat, flatulence, vomiting, nausea, dyspepsia, arthritis, rheumatalgia, bruise, sprain, dislocation, estrus, and treating sexual impotence, and is suitable for puerperal care. Improve the blood color of the skin, promote blood circulation and remove blood stasis. Stimulating heart, relieving neurasthenia, mental fatigue, dizziness, and activating collaterals. It is also especially helpful for the state of excessive moisture or body fluid in the body, such as influenza, excessive phlegm and nasal discharge, and can also relieve sore throat and tonsillitis, although it is warm oil, it can suppress the tsutsutsugami caused by excessive dampness, promote the activity of sweat gland, and another important function is to regulate irregular menstruation caused by cold, regulate and stabilize digestive system, promote gastric secretion, and produce good effects on the following problems, such as inappetence, digestive ache, flatulence, diarrhea and scurvy, even when feeling regurgitation, migraine, motion sickness; its analgesic properties can relieve arthritis, rheumatalgia, cramps, sprains, muscle spasms, especially lower back pain; stimulating circulation, relieving angina pectoris, and improving chilblain, blood cholesterol and varicosis; has been regarded as an aphrodisiac for a long time, is valuable in the aspect of treatment incapacity, and can also be used for postpartum care to eliminate accumulated blood clots; maintaining vision, improving hearing, and making sense organs sharp.

Squalane: the squalene extracted from the liver of deep sea shark is hydrogenated to obtain hydrocarbon oil with excellent performance, so the oil is named as deep sea shark liver oil. Scientific research finds that squalane is rare animal oil with high chemical stability and excellent use feeling, has better affinity to the skin, does not cause allergy and irritation, and can accelerate other active ingredients in the formula to permeate into the skin; has low polarity and moderate spreadability, and is pure, colorless and odorless; it also can inhibit the growth of mold. Skin care value of squalane: the skin care product strengthens and repairs the epidermis, effectively forms a natural protective film and helps balance between the skin and sebum. Squalane is a lipid closest to sebum of human body, has strong affinity, can be integrated with the sebum membrane of human body, and forms a natural barrier on the skin surface. And the squalane can also inhibit the peroxidation of skin lipid, can effectively permeate into the skin, can promote the proliferation of skin basal cells, and has obvious physiological effects of delaying skin aging and improving and eliminating chloasma. Squalane can also open skin pores, promote blood microcirculation, promote cell metabolism and help repair damaged cells.

The invention at least comprises the following beneficial effects:

1. all the components of the invention are natural oil and fat, are all from natural animals and plants, avoid adding synthetic oil and fat, and are mild and non-irritant.

2. The massage oil disclosed by the invention is suitable for a wide range of people, can be suitable for puerperae, women with irregular menstruation and people with low libido, and can also be suitable for people with cold body, skin aging, obstructed channels and collaterals, high working pressure and the like.

3. The massage oil disclosed by the invention has the advantages that the main component of the massage oil is ginger root oil, the effect of the ginger root oil is obvious, but the massage oil has certain irritation when being directly used, and the unique effects of the massage oil, such as menstruation conditioning, libido promotion and the like, cannot be completely exerted, so that the squalane is added, the stability is high, the skin affinity is strong, and the massage oil is matched with the ginger root oil, so that the effects of the ginger root oil and the squalane can be maintained, and the synergistic effect can be realized.

4. The common massage oil is not suitable for sensitive people such as pregnant women, children and the like, but the massage oil can adapt to different sensitive people under the mutual cooperation of the components.

5. When the massage oil is prepared, various raw materials are added separately and simultaneously, so that the mixing uniformity of all components can be ensured, the situation that all components are blocked or remained at a feeding hole due to different viscosity and different flow rate of different components which are added from the same feeding hole can be avoided.

6. When the massage oil is prepared, the components are decolored, filtered and heated in advance and then mixed, so that the mixing efficiency of the components can be improved, the pigments and impurities of the components can be removed, the required pigments are uniformly added after the mixing is finished, and the stability of the massage oil can be ensured.

7. When the massage oil is prepared, the whole process is carried out under the protection of inert gas such as nitrogen, so that the efficacy of each component is not affected, the stability of the massage oil is improved, and the massage oil is ensured to exert the maximum efficacy.

8. When the massage oil is prepared, the components which are accurately measured are coated with the oil-dispersing layer on the inner wall of the device in the whole process that the components flow through the feeding pipe and enter the mixing container from the feeding hole, so that the components which are mixed can be accurately added according to the required adding amount, no loss is generated in the feeding process, the combination proportion of the mixed components can be controlled, and the proper mixing ratio is verified by an inventor through a large number of experiments.

9. When the massage oil is prepared, the mixing temperature is controlled by blowing air, the temperature of the whole mixing device is uniform, the mixing is better, meanwhile, a roughly suspended space is formed by blowing air, the components can be guaranteed not to be attached to the inner wall of a mixing container when being mixed, the trouble of cleaning the mixing container is avoided, on the other hand, the phenomenon that the mixture ratio of the mixed components is changed to a certain extent due to different adhesive forces of the different components to the inner wall of the mixing container can be avoided, the components can be subjected to convection mixing by blowing air, and an additional stirring device is not needed.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.

Example 1

The soothing massage oil comprises the following components in parts by weight:

15 parts of olive fruit oil, 15 parts of ginger root oil, 15 parts of squalane, 25 parts of mineral oil, 10 parts of hydrogenated almond oil, 10 parts of sweet almond oil, 10 parts of grape seed oil and 0.01 part of CI 4700 pigment.

The preparation method comprises the following steps:

step two: the mixing container is of a square structure, the inner side walls and the bottom edges of the mixing container are provided with air blowing devices, the air blowing directions of the air blowing devices are perpendicular to the center of the mixing container, a suspended space is formed inside the mixing container by reasonably setting the air blowing size of the air blowing devices, all the components are uniformly mixed in the suspended space, all the components are not stuck to the inner wall of the mixing container, the air blowing device continuously blows air, the air blowing temperature is controlled according to the temperature required by the mixing container, and the air blowing is inert nitrogen;

step three: respectively heating olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil to 60 ℃, then accurately adding the heated olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil into a mixing container in proportion to form a mixture A, respectively adding each component of the mixture A into the mixing container through different feeding ports, and controlling the speed of each component to be added to complete the simultaneous feeding of the components, wherein the temperature in the mixing container is 60 ℃;

step four: respectively heating ginger root oil and squalane to 60 ℃, respectively adding the mixture A into a mixing container through different feed inlets after the mixture A is uniformly mixed, and simultaneously finishing feeding to form a mixture B;

step five: after the mixture B is uniformly mixed, preserving the heat for 30 minutes;

step six: controlling the temperature of the blast device to raise the mixing temperature of the mixture B to 90 ℃, and then preserving the heat for 40 minutes;

step seven: controlling the temperature of the blast device to be reduced to 55 ℃, adding pigments through different feed inlets, and uniformly mixing;

step eight: and after controlling the temperature of the blast device to be continuously reduced to 35 ℃, closing the blast device arranged on the bottom edge of the mixing container, and discharging and subpackaging the mixture B from a discharge hole below the mixing container.

Example 2

The soothing massage oil comprises the following components in parts by weight:

5 parts of olive fruit oil, 5 parts of ginger root oil, 5 parts of squalane, 83.5 parts of mineral oil, 0.5 part of hydrogenated almond oil, 0.5 part of sweet almond oil, 0.5 part of grape seed oil and 0.01 part of CI 4700 pigment.

The preparation method comprises the following steps:

step three: respectively heating olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil to 50 ℃, then accurately adding the heated olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil into a mixing container in proportion to form a mixture A, respectively adding each component of the mixture A into the mixing container through different feeding ports, and controlling the speed of each component to be added to complete the simultaneous feeding of the components, wherein the temperature in the mixing container is 50 ℃;

step four: respectively heating ginger root oil and squalane to 50 ℃, respectively adding the mixture A into a mixing container through different feed inlets after the mixture A is uniformly mixed, and simultaneously finishing feeding to form a mixture B;

step five: after the mixture B is uniformly mixed, preserving the heat for 18 minutes;

step six: controlling the temperature of the blast device to raise the mixing temperature of the mixture B to 80 ℃, and then preserving the temperature for 30 minutes;

step seven: controlling the temperature of the blast device to be reduced to 48 ℃, adding pigments through different feed inlets, and uniformly mixing;

step eight: and after controlling the temperature of the blast device to be continuously reduced to 25 ℃, closing the blast device arranged on the bottom edge of the mixing container, and discharging and subpackaging the mixture B from a discharge hole below the mixing container.

Example 3

The soothing massage oil comprises the following components in parts by weight:

10 parts of olive fruit oil, 10 parts of ginger root oil, 10 parts of squalane, 65 parts of mineral oil, 5 parts of hydrogenated almond oil, 5 parts of sweet almond oil, 5 parts of grape seed oil and 0.01 part of CI 4700 pigment.

The preparation method comprises the following steps:

step three: respectively heating olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil to 55 ℃, then accurately adding the heated olive fruit oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil into a mixing container in proportion to form a mixture A, respectively adding each component of the mixture A into the mixing container through different feed inlets, and controlling the respective adding speeds to control the simultaneous feeding of the components to be finished, wherein the temperature in the mixing container is 55 ℃;

step four: respectively heating ginger root oil and squalane to 55 ℃, respectively adding the mixture A into a mixing container through different feed inlets after the mixture A is uniformly mixed, and simultaneously finishing feeding to form a mixture B;

step five: after the mixture B is uniformly mixed, keeping the temperature for 25 minutes;

step six: controlling the temperature of the blast device to raise the mixing temperature of the mixture B to 85 ℃, and then keeping the temperature for 35 minutes;

step seven: controlling the temperature of the blast device to be reduced to 50 ℃, adding pigments through different feed inlets, and uniformly mixing;

step eight: and after controlling the temperature of the blast device to be continuously reduced to 30 ℃, closing the blast device arranged on the bottom edge of the mixing container, and discharging and subpackaging the mixture B from a discharge hole below the mixing container.

Comparative example 1

The soothing massage oil comprises the following components in parts by weight:

10 parts of olive fruit oil, 10 parts of squalane, 65 parts of mineral oil, 5 parts of hydrogenated almond oil, 5 parts of sweet almond oil, 5 parts of grape seed oil and 0.01 part of CI 4700 pigment.

The preparation method comprises the following steps:

the method comprises the following steps: olive fruit oil, squalane, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil are respectively decolorized and filtered by activated clay for later use;

step four: heating squalane to 55 ℃, respectively adding the mixture A into a mixing container through different feed inlets after the mixture A is uniformly mixed, and simultaneously finishing feeding to form a mixture B;

Comparative example 2

The soothing massage oil comprises the following components in parts by weight:

10 parts of olive fruit oil, 10 parts of ginger root oil, 65 parts of mineral oil, 5 parts of hydrogenated almond oil, 5 parts of sweet almond oil, 5 parts of grape seed oil and 0.01 part of CI 4700 pigment.

The preparation method comprises the following steps:

the method comprises the following steps: olive fruit oil, ginger root oil, mineral oil, hydrogenated almond oil, sweet almond oil and grape seed oil are respectively decolorized and filtered by activated clay for later use;

step four: heating ginger root oil to 55 ℃, respectively adding the mixture A into a mixing container through different feed inlets after the mixture A is uniformly mixed, and simultaneously finishing feeding to form a mixture B;

To verify the safety and efficacy of the massage oil of the present invention, the following comparative tests were performed in detail:

first, anaphylaxis test

The five massage oils of example 1, example 2, example 3, comparative example 1 and comparative example 2 were directly applied to the inner sides of the arms of volunteers who were randomly selected from groups of different ages and different sexes, and each massage oil corresponded to 30 volunteers. After 48 hours of observation, the volunteers were examined for the presence or absence of any adverse reactions such as itching, allergy, etc.

Experiments prove that 6 volunteers in the comparative example 2 have uncomfortable reactions with different degrees, and all the volunteers in the examples 1, 2, 3 and 1 have no uncomfortable reactions, so that the massage oil disclosed by the invention is safe and reliable, has no stimulation, cannot cause allergic reactions of the skin, and meanwhile, the massage oil containing the ginger root oil without the squalane has certain stimulation and can cause allergic reactions with certain degrees.

Second, the efficacy of relieving

Patients of different age groups and different sexes are randomly selected, five kinds of massage oil in the embodiment and the comparative example are adopted for massage, each kind of massage oil corresponds to 50 volunteer patients, then the feeling of the treatment effect is scored to be the highest 100 points, and then the average value is taken, and the result is shown in the following table 1:

	relieving pain	Promoting blood circulation to remove blood stasis	Absorption effect
				Example 1	90.72	93.13	87.67
Example 2	88.33	92.39	88.34
				Example 3	89.90	94.27	91.57
Comparative example 1	84.45	86.06	88.23
				Comparative example 2	85.49	90.35	83.89

As can be seen from the above Table 1, the effects of examples 1 to 3 of the present invention are better than the effects of relieving pain and promoting blood circulation to remove blood stasis of comparative examples 1 and 2, but the absorption effect is obviously poor compared with comparative example 2, which shows that squalane can promote the skin to absorb ginger root oil.

Third, efficacy of irregular menstruation

Female patients of different age groups are randomly selected, five kinds of massage oil in examples and comparative examples are used for massaging the lower abdomen, each kind of massage oil corresponds to 30 volunteer patients, the massage is performed for three months, the massage is performed once in the morning and at the evening every day, the massage time is 30 minutes, and the corresponding effect results are as shown in the following table 2:

	significant number of effective people	Number of effective persons	Total effective rate
				Example 1	25	5	100％
Example 2	27	3	100％
				Example 3	25	5	100％
Comparative example 1	0	13	43％
				Comparative example 2	12	10	73％

Because the massage oil containing ginger root oil without squalane has certain irritation, the female patients with irregular menstruation can be tested for sensitivity on the inner arm, and if no anaphylaxis exists, the massage treatment is carried out, otherwise, the next volunteer is replaced. As can be seen from table 2 above, the massage oil of the present invention has 100% therapeutic effect on female irregular menstruation and significant effectiveness approaching 90% compared to the massage oils of comparative examples 1 and 2, and thus is a gospel for women.

Fourth, efficacy of promoting libido

Patients of different ages are randomly selected, five kinds of massage oil in the examples and the comparative examples are tried, each kind of massage oil corresponds to 30 volunteer patients, and after two months, corresponding efficacy results are shown in the following table 3:

	significant number of effective people	Number of effective persons	Total effective rate
				Example 1	13	10	77％
Example 2	10	8	60％
				Example 3	12	11	77％
Comparative example 1	0	7	23％
				Comparative example 2	3	10	43％

The test also was conducted with a sensitivity test. As can be seen from table 3 above, the massage oil of the present invention has a certain therapeutic effect on increasing the patient's libido, compared to the massage oils of comparative examples 1 and 2.

Fifth, efficacy of postpartum recovery

Randomly selecting puerpera of different ages, massaging the abdomen by using five kinds of massage oil in the embodiment and the comparative example after production, wherein each kind of massage oil corresponds to 30 volunteer patients, insisting on massaging once in the morning and at night every day, the massage time is 30 minutes, then observing the time required for complete recovery of uterus after production, and the corresponding efficacy results are as shown in the following table 4:

	example 1	Example 2	Example 3	Comparative example 1	Comparative example 2
						Recovery time (week)	4.8	4.7	4.3	5.8	5.4

The test also was conducted with a sensitivity test. As can be seen from the above table 4, the massage oil of the present invention can significantly shorten the time for recovering the uterus after being used by the puerpera, and meanwhile, the components of the massage oil of the present invention are all the naturally extracted oils, which have no side effect on the body and do not cause other uncomfortable reactions of the puerpera.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims

1. The soothing massage oil containing ginger root oil is characterized by comprising the following components in parts by weight: 5-15 parts of olive fruit oil, 5-15 parts of ginger root oil, 5-15 parts of squalane, 25-83.5 parts of mineral oil, 0.5-10 parts of hydrogenated almond oil, 0.5-10 parts of sweet almond oil and 0.5-10 parts of grape seed oil.

2. The soothing massage oil containing ginger root oil as claimed in claim 1, comprising the following components in parts by weight: 7-12 parts of olive fruit oil, 8-14 parts of ginger root oil, 7-12 parts of squalane, 38-72 parts of mineral oil, 2-8 parts of hydrogenated almond oil, 2-8 parts of sweet almond oil and 2-8 parts of grape seed oil.

3. The soothing massage oil containing ginger root oil as claimed in claim 1, comprising the following components in parts by weight: 8.7-10.5 parts of olive oil, 9.2-10.9 parts of ginger root oil, 8.7-10.5 parts of squalane, 47.1-61.4 parts of mineral oil, 4-7 parts of hydrogenated almond oil, 4-7 parts of sweet almond oil and 4-7 parts of grape seed oil.

4. A soothing massage oil containing ginger root oil as claimed in any one of claims 1 to 3, further comprising a natural pigment.

5. A method of preparing a soothing massage oil containing ginger root oil as claimed in claim 4, comprising the steps of:

step seven: controlling the temperature of the blast device, cooling to 48-55 ℃, adding natural pigments through different feed inlets, and uniformly mixing;

6. A process for preparing a soothing massage oil containing ginger root oil as claimed in claim 5, wherein the air blown by the blowing means is inert gas and the mixing vessel is always filled with inert gas by blowing before feeding.

7. A process for preparing a soothing massage oil containing ginger root oil as claimed in claim 5, wherein the inner side wall and bottom edge of said mixing container are coated with oil-repellent layer, the components are fed through a scaled feeder and feeding tube, and the inner walls of the feeder and feeding tube are coated with oil-repellent layer.