CN216285096U

CN216285096U - Food contact material migration experiment preprocessing device

Info

Publication number: CN216285096U
Application number: CN202122728668.6U
Authority: CN
Inventors: 胡云; 邹勇平; 周元元; 王帅; 卢伟; 杨�嘉
Original assignee: Yangzhou Food And Drug Inspection And Testing Center
Current assignee: Yangzhou Food And Drug Inspection And Testing Center
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-04-12
Anticipated expiration: 2031-11-09

Abstract

The utility model relates to a pretreatment device for a migration experiment of a food contact material, which belongs to the technical field of food contact material detection, and comprises a barrel, wherein a top cover is arranged at the top of the barrel, the barrel is in sealed connection with the top cover, the barrel comprises an inner barrel and an outer barrel, a heat-insulating layer is arranged between the inner barrel and the outer barrel, and a temperature control heater is arranged between the bottom of the inner barrel and the bottom of the outer barrel; the section of an inner cavity of the inner cylinder is circular, a piston is arranged in the inner cylinder in a matched mode, a piston rod of the piston upwards penetrates through the top cover, a first handle is arranged at the top of the piston rod, a core rod penetrating through the piston rod and the piston is arranged in the center of the piston rod, and the core rod is in dynamic sealing connection with the piston rod; the lower end of the core rod is connected with a pressing claw for pressing a sample, the upper end of the core rod is connected with a second handle, and the side face of the cylinder body is positioned below the piston and is provided with a control valve for exhausting and supplementing liquid. The device can ensure that the migratory substances in the food contact material can be effectively collected, provides guarantee for subsequent accurate detection, and can be used in migration experiments of various food contact materials.

Description

Food contact material migration experiment preprocessing device

Technical Field

The utility model relates to a pretreatment device for a migration experiment of food contact materials, in particular to a pretreatment device for a migration experiment of food contact materials such as straws, chopsticks, spoons, knives, forks and the like.

Background

Contaminants may be present in food products from a variety of sources, one of the major sources of these contaminants being food contact materials, such as: impurities contained in raw materials or additives for producing food contact materials; certain amounts of additives and processing aids are added during the manufacturing process in order to improve the physicochemical properties of the food contact material; the degradation products of the monomers, additives and processing aids for manufacturing the food contact material are generated under the exposure of high temperature, high radiation and microwave; novel compounds formed after prolonged contact of food contact materials with food; the recyclable material is used to produce food contact material, endogenous contaminants produced during the recycling process. These contaminants can migrate into the food product by diffusion and permeation, and present a considerable potential hazard to human health.

The method for evaluating the safety of food contact materials by using a migration experiment is a method which is universal at home and abroad at present. In the current national food safety standard GB5009.156-2016 general rule for food contact material and product migration test pretreatment methods, a migration test cell method is to load a preheated or precooled food simulation liquid and a sample into a migration test cell, then place the migration test cell into a thermostatic device for a certain period of time, and detect the migrated substances in the food simulation liquid by using analytical instruments such as a gas chromatography, a gas chromatography-tandem mass spectrometry, a liquid chromatography-tandem mass spectrometry, and the like so as to evaluate the safety of the food contact material.

In the Chinese patent database, a food contact material migration testing device is disclosed, and the application numbers thereof are as follows: 202022176185.5, respectively; publication No.: CN 213749493U; the publication date is as follows: 2021.07.20, respectively; the device comprises a glass container, a top cover matched with the glass container, a screw rod in threaded connection with the top cover, a connecting mechanism for connecting the top cover and the glass container, a pressing plate arranged on the end part of the screw rod and a grabbing mechanism, wherein the grabbing mechanism comprises a plurality of top columns arranged on the pressing plate, suckers matched with the top columns and a control assembly for controlling the top columns to move up and down; when the food contact material is required to be pressed down by the pressing plate, the top column can be extended out, the sucking disc is prevented from being adsorbed on the food contact material, and the contact area between the food contact material and the simulated solvent is ensured; after the test is completed, the top column is retracted into the pressing plate, the pressing plate is moved downwards, the sucking disc is adsorbed on the top surface of the food contact material, and then the pressing plate is moved upwards to take out the food contact material. The disadvantages are that: although the device has a simple structure, the interference factors are large in the test process, and the volatile matters cannot be normally collected and tested, so that the accuracy of the test result is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pretreatment device for a migration experiment of a food contact material, which can comprehensively pretreat the food contact material, ensure that migrants in the food contact material can be effectively collected, and provide guarantee for accurate detection of subsequent analysis instruments such as a gas chromatograph, a gas chromatograph-tandem mass spectrum, a liquid chromatograph-tandem mass spectrum and the like.

The purpose of the utility model is realized as follows: a pretreatment device for a migration experiment of a food contact material comprises a barrel, wherein a top cover is arranged at the top of the barrel, the barrel and the top cover are connected in a sealing manner, the barrel comprises an inner barrel and an outer barrel, a heat insulation layer is arranged between the inner barrel and the outer barrel, and a temperature control heater is arranged between the bottom of the inner barrel and the bottom of the outer barrel; the section of the inner cavity of the inner cylinder is circular, a piston is arranged in the inner cylinder in a matched mode, a piston rod of the piston upwards penetrates through the top cover, a first handle is arranged at the top of the piston rod, the piston rod is of a hollow structure, a core rod penetrating through the piston rod and the piston is arranged in the center of the piston rod, and the core rod is in dynamic sealing connection with the piston rod; the lower end of the core rod is connected with a pressing claw for pressing a sample, the upper end of the core rod is connected with a second handle, and the side face of the cylinder body is positioned below the piston and is provided with a control valve for exhausting and supplementing liquid.

When the device uses, open the top cap, upwards take out piston and pressure claw, put into the inner tube with food contact material, insert the piston in the inner tube, cover the top cap, push down the sample through pressing the claw, heat or cool off food contact material through temperature controller, make it accord with the experiment temperature requirement. When the temperature of the food contact material reaches the experimental temperature, the food simulation liquid with the same temperature as the experimental temperature is added into the inner cylinder through the outer connecting pipe of the control valve until the food contact material is completely immersed in the food simulation liquid, and the added food simulation liquid is observed and controlled through the liquid level meter, so that the food simulation liquid has a certain liquid level. After a certain experimental time, the operation is stopped, the piston is taken out, and the food simulation liquid is extracted from the control valve to carry out subsequent analysis experiment of the transferee instrument. Or the food simulation liquid is not added into the inner cylinder, so that the gas components diffused and volatilized in the food contact material are directly extracted from the control valve for analysis after the food contact material passes through a certain experiment time at a certain experiment temperature. The food contact material contains various migrant substances, the arrangement of the piston and the controllable one-way valve enables the complete extraction of the gas migrant substances diffused and volatilized in the food contact material to be possible, the effective collection, analysis and detection of all volatile components in the migrant substances are facilitated, and the liquid supplementing can be carried out through the control valve. Compared with the prior art, the method can comprehensively pretreat the food contact material, ensures that the migratory matters in the food contact material can be completely and effectively collected, and provides guarantee for accurate analysis and detection of subsequent analytical instruments such as gas chromatography, gas chromatography-tandem mass spectrometry, liquid chromatography-tandem mass spectrometry and the like. The migration test device can be used in migration tests of various food contact materials, and can ensure that the test result is more accurate.

In order to facilitate the disassembly and assembly of the piston, the upper part of the inner cylinder is in a conical shape which is gradually reduced from top to bottom, and the lower part of the inner cylinder is in a cylinder shape with the same diameter. The conical structure can facilitate the entry of the piston and has a guiding function.

In order to facilitate observation of the liquid level and make liquid supplement when necessary, a liquid level meter is arranged outside the outer cylinder.

As a further improvement of the utility model, the bottom in the inner cylinder is provided with a plurality of upward point-shaped or strip-shaped bulges. The supporting function of the bulge device can ensure the full contact between the food contact material and the simulation liquid.

Further, an exhaust safety valve is arranged above the piston on the cylinder. When the air pressure in the inner cylinder rises, the piston can be jacked upwards, and when the piston crosses the position of the exhaust safety valve, the exhaust can be carried out through the exhaust safety valve, so that the safety problem is avoided. The exhaust safety valve may be a check valve that exhausts air to the outside under pressure.

Furthermore, the control valve is a controllable one-way valve, the controllable one-way valve comprises a hollow valve body and an outer joint, the valve body is in threaded connection with the inner barrel, a valve ball, a spring and a spring seat with holes are arranged in the valve body, a valve face is arranged in the valve body corresponding to the valve ball, the spring is arranged between the valve ball and the spring seat with holes, and the controllable one-way valve is correspondingly closed or opened when the valve ball contacts or separates from the valve face; the valve ball is positioned on one outward side of the cylinder body; the outer joint is in threaded connection with the valve body, the center of the outer joint is provided with the ejector pin, when the outer joint is unscrewed, the ejector pin is separated from the valve ball, and when the outer joint is screwed, the ejector pin inwards jacks the valve ball. When carrying out food contact material migration experiment preliminary treatment, can be to the inner tube in fluid infusion through the control valve, also can outwards take out the inner tube through the control valve in gaseous assay and detection, at ordinary times, also can dismantle the external joint, controllable check valve realizes sealing by oneself for gas in the migration experiment is sealed in the inner tube completely.

In order to ensure that the pressing of the pressing claw does not affect the sufficient contact between the food contact material and the simulation liquid, the pressing claw is in a grid shape.

In order to further ensure the use reliability of the device and improve the safety, the side surface of the upper part of the outer barrel is provided with a lower lug, the side surface of the top cover is correspondingly provided with an upper lug, the upper lug is in threaded connection with a connecting column, and the connecting column penetrates through the upper lug and locks the upper lug and the lower lug through a nut. The structure can prevent the piston from collapsing upwards under the pushing of air pressure to hurt people.

In order to further reduce the escape of gas, a sealing ring with an inverted U-shaped section is embedded in the lower side edge of the top cover, and the sealing ring is sealed between the upper end face of the cylinder and the top cover.

Drawings

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

Fig. 2 is a partially enlarged view of a in fig. 1.

In the figure, 1 electric plug interface, 2 temperature control probe, 3 inner cylinder, 4 press claw, 5 liquid level meter, 6 heat preservation layer, 7 outer cylinder, 8 lower lug, 9 connecting column, 10 upper lug, 11 nut, 12 handle II, 13 core rod, 14 handle I, 15 top cover, 16 piston rod, 17 sealing ring, 18 piston, 19 safety valve, 20 control valve, 20a perforated spring seat, 20b spring, 20c valve body, 20d valve ball, 20e valve face, 21 outer joint, 21a thimble, 22 connecting pipe, 23 bulge and 24 temperature control heater.

Detailed Description

As shown in the figure, the pretreatment device for the migration experiment of the food contact material comprises a barrel, wherein a top cover 15 is arranged at the top of the barrel, the barrel is hermetically connected with the top cover 15, the barrel comprises an inner barrel 3 and an outer barrel 7, a heat insulation layer 6 is arranged between the inner barrel 3 and the outer barrel 7, and a temperature control heater 24 is arranged between the bottom of the inner barrel 3 and the bottom of the outer barrel 7; the barrel is provided with an electric plug interface 1, the outer wall of the inner barrel 3 is provided with a temperature control probe 2, and a temperature control heater 24 is controlled by detecting the temperature of the inner barrel 3, so that the inner barrel 3 is kept at a set temperature; the section of the inner cavity of the inner cylinder 3 is circular, a piston 18 is arranged in the inner cylinder 3 in a matched mode, a piston rod 16 of the piston 18 upwards penetrates through a top cover 15, a first handle 14 is arranged at the top of the piston rod 16, the piston rod 16 is of a hollow structure, a core rod 13 penetrating through the piston rod 16 and the piston 18 is arranged in the center of the piston rod 16, and the core rod 13 is in dynamic sealing connection with the piston rod 16; the lower end of the core rod 13 is connected with a pressure claw 4 for pressing down a sample, the upper end of the core rod 13 is connected with a second handle 12, and a control valve 20 for exhausting and supplementing liquid is arranged below the piston 18 on the side surface of the cylinder.

In order to facilitate the disassembly and assembly of the piston 18, the upper part of the inner cylinder 3 is in a conical shape which is gradually reduced from top to bottom, and the lower part of the inner cylinder 3 is in a cylinder shape with the same diameter. The conical structure can facilitate the entry of the piston 18 and has a guiding function. The outer cylinder 7 is externally provided with a liquid level meter 5. The inner bottom of the inner cylinder 3 is provided with a plurality of upward point-shaped or strip-shaped bulges 23. The support of the projections 23 ensures adequate contact between the food contact material and the simulant.

An exhaust safety valve 19 is provided on the cylinder above the piston 18. When the air pressure in the inner cylinder 3 rises, the piston 18 can be jacked upwards, and when the piston 18 passes the position of the exhaust safety valve 19, the exhaust safety valve 19 can exhaust air, so that the safety problem is avoided. The exhaust relief valve 19 is a check valve that exhausts air under pressure.

The control valve 20 is a controllable one-way valve, the controllable one-way valve comprises a hollow valve body 20c and an outer joint 21, the valve body 20c is in threaded connection with the inner barrel 3, a valve ball 20d, a spring 20b and a perforated spring seat 20a are arranged in the valve body 20c, a valve face 20e is arranged in the valve body 20c and corresponds to the valve ball 20d, the spring 20b is arranged between the valve ball 20d and the perforated spring seat 20a, and when the valve ball 20d contacts or is separated from the valve face 20e, the controllable one-way valve is correspondingly closed or opened; the valve ball 20d is positioned on the outward side of the cylinder body; the outer joint 21 is connected with the valve body 20c through threads, the center of the outer joint 21 is provided with an ejector pin 21a, when the outer joint 21 is unscrewed, the ejector pin 21a is separated from the valve ball 20d, and when the outer joint 21 is screwed, the ejector pin 21a pushes the valve ball 20d inwards. The outer joint 21 links to each other with connecting pipe 22, when carrying out food contact material migration experiment preliminary treatment, can be to inner tube 3 internal fluid infusion through connecting pipe 22, control valve 20, also can outwards take out the inner tube 3 internal gas through connecting pipe 22, control valve 20 and carry out chemical examination and detection, at ordinary times, also can demolish outer joint 21, and controllable check valve realizes sealing by oneself for gas in the migration experiment is totally enclosed in inner tube 3.

In order to ensure that the pressing of the pressing claw 4 does not affect the sufficient contact between the food contact material and the simulation liquid, the pressing claw 4 is in a grid shape.

In order to further ensure the use reliability of the device and improve the safety, the side surface of the upper part of the outer cylinder 7 is provided with a lower lug 8, the side surface of the top cover 15 is correspondingly provided with an upper lug 10, the upper lug 8 is in threaded connection with a connecting column 9, and the connecting column 9 penetrates through the upper lug 10 and locks the upper lug 10 and the lower lug 8 through a nut 11. This configuration prevents the piston 18 from collapsing upward under pneumatic pressure to injure a person.

In order to further reduce the gas escape, the lower side edge of the top cover 15 is embedded with a sealing ring 17 with an inverted U-shaped section, and the sealing ring 17 is sealed between the upper end surface of the cylinder and the top cover 15.

When the device uses, open top cap 15, upwards take out piston 18 and pressure claw 4, then put into inner tube 3 with food contact material sample, insert piston 18 in inner tube 3, cover top cap 15, push down the sample through pressure claw 4, heat or cool off food simulation liquid through temperature control heater 24, make its temperature requirement that accords with the experiment, then will add the food simulation liquid unanimous with the experiment temperature to inner tube 3 through control valve 20 and connecting pipe 22, make food simulation liquid submerge food contact material completely, observe and control the food simulation liquid that adds through level gauge 5, and guarantee that it has certain liquid level, after certain experimental time, the experiment stops, take out piston 18, extract food simulation liquid through control valve 20 and carry out the analysis and inspection. The volatile migrating components that diffuse in the food contact material at a given test temperature and test time can also be directly extracted for analytical detection by control valve 20. The food contact material contains a plurality of migrants, and the arrangement of the piston 18 and the controllable one-way valve 20 makes the complete extraction of volatile migration components possible, so that the effective collection of all volatile components in the migrants is facilitated, and the liquid supplementing can be carried out through the control valve 20. Compared with the prior art, the method can comprehensively pretreat the food contact material, ensures that the migratory matters in the food contact material can be completely and effectively collected, and provides guarantee for accurate analysis and detection of subsequent analytical instruments such as gas chromatography, gas chromatography-tandem mass spectrometry, liquid chromatography-tandem mass spectrometry and the like. The migration test device can be used in migration tests of various food contact materials, and can ensure that the test result is more accurate.

The device can realize automatic control through a control device, for example, a timer can realize the working time of 0 hour to 10 days, and automatically reduces the temperature to the set temperature after the test is finished. The control panel of the control device is preset with selectable migration experiment conditions, the required migration experiment time and temperature can be selected according to the most extreme contact time and temperature, and the experiment temperature and time can be set according to the expected use conditions.

The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. The utility model provides a food contact material migration experiment preprocessing device, includes the barrel, and the barrel top is equipped with the top cap, sealing connection, its characterized in that between barrel and the top cap: the barrel comprises an inner barrel and an outer barrel, a heat-insulating layer is arranged between the inner barrel and the outer barrel, and a temperature control heater is arranged between the bottom of the inner barrel and the bottom of the outer barrel; the section of the inner cavity of the inner cylinder is circular, a piston is arranged in the inner cylinder in a matched mode, a piston rod of the piston upwards penetrates through the top cover, a first handle is arranged at the top of the piston rod, the piston rod is of a hollow structure, a core rod penetrating through the piston rod and the piston is arranged in the center of the piston rod, and the core rod is in dynamic sealing connection with the piston rod; the lower end of the core rod is connected with a pressing claw for pressing a sample, the upper end of the core rod is connected with a second handle, and the side face of the cylinder body is positioned below the piston and is provided with a control valve for exhausting and supplementing liquid.

2. The pretreatment device for migration experiment of food contact material according to claim 1, wherein: the upper part of the inner cylinder is in a conical shape which is gradually reduced from top to bottom, and the lower part of the inner cylinder is in a cylinder shape with the same diameter.

3. The pretreatment device for migration experiment of food contact material according to claim 1, wherein: and a liquid level meter is arranged outside the outer barrel.

4. The pretreatment device for migration experiment of food contact material according to any one of claims 1 to 3, wherein: the inner bottom of the inner cylinder is provided with a plurality of upward point-shaped or strip-shaped bulges.

5. The pretreatment device for migration experiment of food contact material according to any one of claims 1 to 3, wherein: and an exhaust safety valve is arranged above the piston on the cylinder body.

6. The pretreatment device for migration experiment of food contact material according to claim 5, wherein: the exhaust safety valve is a one-way valve which exhausts air outwards under the action of pressure.

7. The pretreatment device for migration experiment of food contact material according to any one of claims 1 to 3, wherein: the control valve is a controllable one-way valve, the controllable one-way valve comprises a hollow valve body and an outer joint, the valve body is in threaded connection with the inner barrel, a valve ball, a spring and a spring seat with holes are arranged in the valve body, a valve face is arranged in the valve body corresponding to the valve ball, the spring is arranged between the valve ball and the spring seat with holes, and the controllable one-way valve is correspondingly closed or opened when the valve ball contacts or separates from the valve face; the valve ball is positioned on one outward side of the cylinder body; the outer joint is in threaded connection with the valve body, the center of the outer joint is provided with the ejector pin, when the outer joint is unscrewed, the ejector pin is separated from the valve ball, and when the outer joint is screwed, the ejector pin inwards jacks the valve ball.

8. The pretreatment device for migration experiment of food contact material according to any one of claims 1 to 3, wherein: the pressing claw is in a grid shape.

9. The pretreatment device for migration experiment of food contact material according to any one of claims 1 to 3, wherein: the side surface of the upper part of the outer barrel is provided with a lower lug, the side surface of the top cover is correspondingly provided with an upper lug, the upper lug is in threaded connection with a connecting column, and the connecting column penetrates through the upper lug and locks the upper lug and the lower lug through a nut.

10. The pretreatment device for migration experiment of food contact material according to claim 9, wherein: and a sealing ring with an inverted U-shaped section is embedded at the lower side edge of the top cover and is sealed between the upper end surface of the cylinder and the top cover.