Production process of vacuum insulation panel

Abstract

The present application relates to a kind of production process of vacuum insulation board, including microfiber making, microfiber core material making and microfiber core material baking→microfiber core material bagging→vacuum sealing→vacuum plate flattening→folding edge→product resting→product detection→packing etc., before bagging, using gluing device to the edge of multilayer structure microfiber core material is bonded in multiple points;The production process of vacuum insulation board of the present application uses waste heat residue in the production of steel and manganese iron as raw material to make microfiber, adds starch and sepiolite in the process of making microfiber core material, forms by washing method, relatively simple production process, lower cost, the microfiber core material made has very good thermal insulation;Before bagging, using gluing device to the edge of multilayer structure microfiber core material is bonded in multiple points, avoids the trouble of manual sewing, the integrity of microfiber core material is better, also reduces the workload of worker, improves work efficiency, with good application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of thermal insulation materials, and particularly relates to a production process of a vacuum insulation plate. BACKGROUND

[0002] The vacuum insulation plate is a kind of thermal insulation material, has the characteristics of light weight, good heat insulation, environmental protection, bendability and the like, and has a relatively high cost, and is widely applied in the fields of household appliances, buildings, ships and the like. The vacuum insulation plate is composed of a core material and a gas barrier film bag, and the heat insulation is determined by the thermal conductivity of the core material and the vacuum degree in the gas barrier film bag. The core material is usually made of mineral wool, foaming material and the like with high porosity and low thermal conductivity. In order to improve the sealing property of the gas barrier film bag, the gas barrier film bag is usually made of multi-layer composite material. The more the layers are, the better the sealing property is, and the longer the service life is.

[0003] The core material has different costs due to different materials and processes. Overall, the production cost of the vacuum insulation plate is always high, and some places in the preparation process are temporarily difficult to be replaced by automatic machines, for example, when the core material made of mineral wool is prepared, after the multi-layer stacked mineral wool is cut, in order to make the core material as a whole more easily loaded into the gas barrier film bag, prevent the misalignment of each piece of the core material, and enhance the integrity, the multi-point sewing is required to be performed on the edge of the mineral wool by manual work, and then the mineral wool is loaded into the gas barrier film bag, and finally the vacuum is extracted, the opening is sealed, and the finished product is obtained. The sewing process generally requires one or two workers to sew the core material from both sides, and at least the sewing is performed at the four corners of the core material (generally six sewing points including the four corners and the two long edge midpoints), the needle threading is required, one round is wound, the knot is tied, and then the thread is cut; this step is one of the bottlenecks of the production efficiency, and there is no suitable automatic machine to complete it, and the work efficiency is determined by the proficiency of the workers.

[0004] In order to further reduce the production cost of the production process of the vacuum insulation plate and improve the production efficiency, it is necessary to further optimize the preparation and processing process of the core material. SUMMARY

[0005] The application aims to provide a production process of a vacuum insulation plate which can use industrial solid waste as raw material, has good product heat insulation and higher production efficiency.

[0006] In order to solve the above technical problems, the application discloses a production process of a vacuum insulation plate, which comprises the following steps:

[0007] S1. Microfiber manufacturing: using waste heat slag in steel and manganese iron production as raw material, using energy-saving electric furnace to warm, adding 10-20% of silica, high-temperature melting, and centrifugal spinning to make microfiber;

[0008] S2. Microfiber core material manufacturing: Take 80 parts by weight of microfiber as the main raw material, add 10-20 parts by weight of glass fiber, add 3-5 parts by weight of starch, and then add 3-6 parts by weight of sepiolite. Stir well with water, shape into a plate by means of a washing method, dry, stack multiple microfiber layers, cut, and obtain the microfiber core material;

[0009] S3. Microfiber core material baking → microfiber core material bagging → vacuum sealing → vacuum plate flattening → edge folding → product standing → product detection → packaging.

[0010] Preferably, in the microfiber core material, the microfiber with a diameter of 4-6 NM is not less than 60 WT%, the total content of slag balls is less than 25%, and the content of slag balls with a particle size of more than 0.5 mm is less than 0.06 WT%.

[0011] Preferably, in S3, before bagging, a glue injection device is used to bond the edges of the multi-layer microfiber core material at multiple points.

[0012] Preferably, the glue injection device comprises a glue supply device and a glue injection needle tube arranged at the bottom of the glue supply device. The glue injection needle tube comprises a tube body and a tip. The tip is a closed sharp part. One side or both sides of the tube body wall are provided with glue outlets. The length from the lower end of the tip to the lower end of the glue outlet is 0.7-1.2 times the thickness of a microfiber layer.

[0013] Preferably, the glue outlet is a group of through holes arranged vertically. The through holes are arranged vertically at equal distances or the distance between the through holes increases from top to bottom.

[0014] Preferably, the glue outlet is a strip-shaped opening arranged along the length direction of the tube body.

[0015] Preferably, the glue supply device comprises a glue barrel with a piston. The piston is connected to a motor through a screw rod. The motor controls the lifting of the piston. The glue barrel is provided with a glue injection control button. Each time the glue injection control button is pressed, the motor drives the piston to advance a certain distance, and a fixed amount of glue flows out of the glue injection needle tube.

[0016] Preferably, the glue supply device comprises a syringe and a glue tank. The syringe comprises a syringe barrel and a piston rod inserted into the syringe barrel. The piston rod is provided with a spring for lifting the piston rod to reset. The lower part of the syringe barrel is in communication with the bottom of the glue tank through a hose with a one-way valve. When the piston rod is pressed manually, the glue in the syringe flows out through the glue injection needle tube. When the piston rod is released, the piston rod is lifted to reset under the action of the spring. In this process, the glue in the glue tank flows out from the hose to refill the syringe.

[0017] Preferably, the glue injection needle tube of the glue injection device is inserted into the microfiber core material and performs oblique glue injection on the edges of the microfiber core material. The glue injection direction forms an angle of 30-75° with the horizontal direction.

[0018] Preferably, the glue injection needle tube is provided with a protective sleeve and a movable sleeve, the movable sleeve is movably sleeved on the upper part of the tube body, and the movable sleeve is used for plugging part of the glue outlet to adapt to micro-fiber core materials of different thicknesses; the protective sleeve is used for temporarily protecting the tube body and the end of the glue injection needle tube, and the protective sleeve is removed during use.

[0019] The production process of the vacuum heat insulation plate uses waste heat slag in steel and manganese iron production as raw material to make micro-fiber, adds starch and sepiolite in the process of making the micro-fiber core material, and is formed by the washing method, so that the production process is relatively simple, the cost is low, the micro-fiber core material has good heat insulation, and the edge of the multi-layer structure of the micro-fiber core material is bonded by the glue injection device before being bagged, so that the trouble of manual sewing is avoided, the integrity of the micro-fiber core material is better, the workload of workers is reduced, the work efficiency is improved, and the application prospect is good. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of a glue injection device.

[0021] Figure 2 It is a structure schematic view of a glue injection needle tube inserted into a micro-fiber core material for glue injection.

[0022] Figure 3 It is a structure schematic view of another glue injection device.

[0023] The reference signs in the drawings are as follows: A-micro-fiber core material, A1-micro-fiber embryo layer, B-glue, 1-glue supply device, 11-glue cylinder, 12-screw rod, 13-motor, 14-glue injection control button, 15-piston, 16-sleeve rod, 101-glue tank, 102-injection cylinder, 103-piston rod, 104-spring, 105-hose, 106-one-way valve, 107-gap, 108-upper end of the piston rod, 2-glue injection needle tube, 21-tube body, 22-end, 23-through hole, 3-protective sleeve, 4-movable sleeve. EMBODIMENT

[0024] The application will be further described in detail by examples, so that those skilled in the art can implement the application according to the description.

[0025] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof. EMBODIMENT

[0026] A production process of a vacuum heat insulation plate comprises the following steps:

[0027] S1. Microfiber production: using waste heat slag in steel and manganese iron production as raw material, using energy-saving electric furnace to warm up, adding 10-20% silica, high temperature melting, centrifugal cotton to make microfiber;

[0028] S2. Microfiber core material production: taking 80 parts by weight of microfiber as the main raw material, adding 10-20 parts by weight of glass fiber, adding 3-5 parts by weight of starch, and adding 3-6 parts by weight of sepiolite, stirring uniformly with water, forming into a plate by washing, drying, stacking multiple microfiber layers, cutting to obtain a microfiber core material;

[0029] S3. Microfiber core material baking → microfiber core material bagging → vacuum sealing → vacuum plate flattening → edge folding → product standing → product detection → packaging.

[0030] In the microfiber core material, the microfiber with a diameter of 4-6 NM is not less than 60 WT%, the total content of slag ball is 25% or less, and the content of slag ball with a particle size of 0.5 mm or more is 0.06 WT% or less.

[0031] After sample detection, the thermal conductivity of the prepared microfiber core material is between 0.005-0.008 W / (m·K), which can achieve the performance index type II of the current industry implementation standard of vacuum insulation board production process (《Building vacuum insulation board production process》JG / T438, Table 4.1.1) Embodiment

[0032] As shown in Figures 1-2 S3, before bagging, a glue injection device is used to bond the edges of the multi-layer microfiber core material A at multiple points, more specifically, the glue injection device is used to bond the multiple upper and lower stacked microfiber layers A1 near the edges with glue that can solidify in a relatively short time (glue that solidifies too quickly can easily block the glue outlet).

[0033] The glue injection device includes a glue supply device 1 and a glue injection needle tube 2 arranged at the bottom of the glue supply device. The glue injection needle tube includes a tube body 21 and an end head 22. The end head is a closed sharp part. One side or both sides of the tube body wall are provided with glue outlets. The length from the lower end of the end head to the lower end of the glue outlet is the thickness of one microfiber layer, so that the lower end of the glue outlet is located at the connection between the two lowermost microfiber layers, which can form effective bonding and reduce the amount of glue used.

[0034] The glue outlet is a group of vertically arranged through holes 23, and the distance between the through holes increases from top to bottom. Generally, when the glue injection needle tube is inserted into the microfiber core material, the thickness of the microfiber embryo layer in the inserted part changes, and the closer to the upper layer, the greater the deformation. The distance between the through holes increases from top to bottom (the hole distance is adaptively adjusted), so that when the glue injection needle tube is inserted into the microfiber core material, each through hole corresponds to the connection between two microfiber embryo layers, enhancing the connection effect and ensuring the integrity of the microfiber core material.

[0035] The glue supply device includes a glue cylinder 11 with a piston 15, and the piston is connected with a motor 13 through a screw rod 12. Specifically, the piston 15 is provided with a sleeve rod 16, the screw rod 12 is threadedly connected with the sleeve rod 16, and the motor controls the lifting of the piston. The glue cylinder is provided with a glue injection control button 14. Each time the glue injection control button 14 is pressed, the motor 13 drives the piston to advance by a distance, and the glue injection needle tube flows out a fixed amount of glue B. When the glue cylinder 11 is filled with glue, the glue can be filled by sucking the glue through the glue injection needle tube. The electrically controlled glue supply device is convenient and efficient, but the cost is relatively high. If it is made wireless, a battery pack and the like need to be added, and the weight is relatively large, so that the worker needs to exert more force when holding and using.

[0036] The glue injection needle tube of the glue injection device is inserted into the microfiber core material and performs oblique glue injection on the edge of the microfiber core material A. The glue injection direction forms an angle of 30-75° with the horizontal direction. If the glue injection needle tube is vertically inserted into the microfiber core material, the glue B solidifies to form a support due to the multiple vertically arranged adhesive solidification points (the glue injection amount may also form an adhesive solidification strip), which is not conducive to the uniform compression of the microfiber core material during vacuumizing after bagging, and the adhesive part may leave obvious convex points on the bag body. When the glue injection needle tube is obliquely inserted, the adhesive solidification points can be staggered in the vertical direction, so that the adhesive solidification points are not easy to form obvious supports, and the surface of the bag body is more flat. The use of glue adhesion instead of rope binding is faster, more efficient, and has better connection effect (if the rope is not tightly bound, the microfiber embryo layer may still move).

[0037] The glue injection needle tube 2 is provided with a protective sleeve 3 and a movable sleeve 4. The movable sleeve 4 is movably sleeved on the upper part of the tube body, and is used to block part of the glue outlet to adapt to microfiber core materials of different thicknesses. The protective sleeve 3 is used to temporarily protect the tube body and the end of the glue injection needle tube, and is removed during use. The protective sleeve can prevent the glue in the glue injection needle tube from solidifying and the glue outlet from being blocked, and the movable sleeve can control the glue outlet position and area of the glue outlet to adapt to core materials of different thicknesses, for example, when a relatively thin microfiber core material is encountered, the movable sleeve is appropriately moved downward.

[0038] When in use, remove the protective sleeve 3. If the thickness of the microfiber core material A changes, adjust the position of the movable sleeve 4 accordingly. The worker holds the glue cylinder 11 and inserts the glue injection needle 2 at an angle into the edge of the microfiber core material A. Press the glue injection control button 14, and the glue injection needle 2 will discharge a certain amount of glue B into the microfiber core material A. The amount of glue discharged each time can be adjusted by controlling the stepping amount of the motor. Example

[0039] like Figure 3 As shown, similar to Embodiment 2, the difference is that the glue supply device includes a syringe and a glue container 101. The syringe includes a syringe barrel 102 and a piston rod 103 inserted into the syringe barrel. The piston rod is provided with a spring 104 for pulling the piston rod back to its original position. The lower part of the syringe barrel 102 is connected to the bottom of the glue container 101 through a hose 105 with a one-way valve 106. When the piston rod 103 is manually pressed, the glue in the syringe is discharged through the glue injection needle tube. When the piston rod 103 is released, the piston rod is lifted back to its original position under the action of the spring 104. During this process, the glue in the glue container 101 flows out from the hose 105 to refill the syringe barrel 102. When the piston rod is manually pressed, due to the action of the one-way valve 106, the glue can only be discharged through the glue injection needle tube. In this embodiment, there is a gap 107 between the syringe and the glue container, allowing a hand to fit through, so that the syringe 102 can act as a handle; the width of the upper end 108 of the piston rod is greater than the inner diameter of the syringe, and the distance between the upper end of the piston rod and the upper end of the syringe is fixed, so that the piston rod moves the same distance each time it is pressed, and the amount of glue extruded each time is stable. The manual glue supply device is relatively laborious, but it is convenient to use and maintain, and has low cost.

[0040] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A production process of a vacuum insulation panel, characterized by, It comprises the following steps: S1. Microfiber production: using waste heat slag in steel and manganese iron production as raw material, using energy-saving electric furnace to warm up, adding 10-20% silica, high temperature melting, centrifugal cotton to make microfiber; S2. Microfiber core material production: taking 80 parts by weight of microfiber as the main raw material, adding 10-20 parts by weight of glass fiber, adding 3-5 parts by weight of starch, and adding 3-6 parts by weight of sepiolite, stirring uniformly with water, forming into a plate by washing, drying, stacking multiple microfiber layers, cutting to obtain a microfiber core material; S3. Microfiber core material baking → microfiber core material bagging → vacuum sealing → vacuum plate flattening → edge folding → product standing → product detection → packaging; In S3, before bagging, a glue injection device is used to bond the edges of the multi-layer microfiber core material at multiple points; The glue injection device comprises a glue supply device and a glue injection needle tube arranged at the bottom of the glue supply device, the glue injection needle tube comprises a tube body and a tip, the tip is a closed sharp part, one side or both sides of the tube body wall are provided with glue outlets; the length from the lower end of the tip to the lower end of the glue outlet is 0.7-1.2 times the thickness of a microfiber layer; The glue injection needle tube of the glue injection device is inserted into the microfiber core material and obliquely injects glue into the edges of the microfiber core material.

2. The production process of a vacuum insulation panel according to claim 1, characterized in that, In the microfiber core material, the content of microfibers with a diameter of 4-6 NM is not less than 60 WT%, the total content of slag balls is less than 25%, and the content of slag balls with a particle size of more than 0.5 mm is less than 0.06 WT%.

3. The production process of a vacuum insulation panel according to claim 1, characterized in that, The glue outlet is a group of through holes arranged vertically, the through holes are arranged vertically at equal intervals or the distance between the through holes increases from top to bottom.

4. The production process of a vacuum insulation panel according to claim 1, characterized in that, The glue outlet is a strip-shaped opening arranged along the length direction of the tube body.

5. The production process of a vacuum insulation panel according to any one of claims 3-4, characterized in that, The glue supply device comprises a glue barrel with a piston, the piston is connected to a motor through a screw rod, the motor controls the lifting of the piston; a glue injection control button is arranged on the glue barrel, each time the glue injection control button is pressed, the motor drives the piston to advance a certain distance, and a fixed amount of glue flows out of the glue injection needle tube.

6. The production process of a vacuum insulation panel according to any one of claims 3-4, characterized in that, The glue supply device comprises a syringe and a glue tank, the syringe comprises a syringe barrel and a piston rod inserted into the syringe barrel, a spring for lifting the piston rod to reset is arranged on the piston rod; the lower part of the syringe barrel is in communication with the bottom of the glue tank through a hose with a one-way valve; when the piston rod is pressed manually, the glue in the syringe flows out through the glue injection needle tube, and when the piston rod is released, the piston rod is lifted to reset under the action of the spring, during which the glue in the glue tank flows out from the hose to refill the syringe barrel.

7. The production process of a vacuum insulation panel according to claim 1, characterized in that, The glue injection direction of the glue injection needle tube of the glue injection device forms an angle of 30-75° with the horizontal direction.

8. The production process of a vacuum insulation panel according to claim 1, characterized in that, A protective sleeve and a movable sleeve are arranged on the glue injection needle tube, the movable sleeve is movably sleeved on the upper part of the tube body, and the movable sleeve is used to block part of the glue outlets to adapt to microfiber core materials with different thicknesses; the protective sleeve is used to temporarily protect the tube body and the tip of the glue injection needle tube, and the protective sleeve is removed during use.

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