A pet sheet having a cold resistance effect

Abstract

The application provides a PET sheet with cold resistance effect, relates to the technical field of PET sheets, and comprises a three-part structure, namely, a middle layer, two base layers and two protective layers. The middle layer is used for forming an inner cavity in the PET sheet. The middle layer comprises a partition frame, the inside of the partition frame is integrally formed with a cross frame, the inside of the cross frame is provided with an auxiliary frame, the auxiliary frame comprises two cross support sheets, the inside of both ends of the support sheet is processed with a ventilation hole, the base layer comprises a base sheet, the surfaces of the two base sheets are respectively fixed with the partition frame and the top end and the bottom end of the cross frame, and the cross frame and the support strip divide the inside of the cross frame into four cavities. The technical key points are as follows: the auxiliary frame is used for supporting in the cavity, the air in the cavity flows in the ventilation hole, when the PET sheet is in a cold environment, the pressure in the cavity is reduced, the deformation amount of the protective layer and the base layer is reduced when the protective layer and the base layer are deformed under the air pressure of the outside world, and the surface flatness of the protective layer is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of PET sheet, and specifically relates to a PET sheet with cold resistance. BACKGROUND

[0002] The PET sheet is greatly favored by consumers due to excellent environmental protection performance such as excellent toughness, high strength, high transparency, recyclability and non-harmful gas production during combustion. The PET sheet has excellent transparency and smoothness, excellent surface decoration performance, high mechanical strength, good oxygen and water vapor barrier properties, and can be used for packaging of food, medicine and medical devices. The PET sheet has good creep resistance, fatigue resistance, wear resistance and dimensional stability, small abrasion and high hardness, and has the largest toughness among thermoplastic plastics. In addition, the PET sheet has good electrical insulation performance and is less affected by temperature, but has poor resistance to corona and is not resistant to hot water immersion and alkali.

[0003] The existing Chinese patent document with the publication number CN216183478U discloses a cold-resistant PET sheet which comprises a first base layer, a second base layer and an intermediate layer made of cold-resistant PET. The structure is stable and has high strength. The cold-resistant PET has more stable structure and performance under low temperature conditions compared with ordinary PET materials, and can meet the use requirements of the PET sheet in extremely cold environments. The intermediate layer is composed of a plurality of horizontal and vertical strips, and a plurality of cavities are uniformly distributed in the sheet, which reduces the mass of the sheet, provides space for deformation of the sheet, and improves the heat preservation performance of the sheet.

[0004] However, in the process of implementing the above technical solution, it is found that the above technical solution has the following technical problems:

[0005] The existing PET sheet uses an intermediate layer to form cavities in the sheet to improve the heat preservation performance of the sheet. However, the PET sheet may be cold shrunk in a cold environment, which causes the internal structure of the PET sheet to be unstable. When the gas in the cavity expands and shrinks, the flatness of the surface of the PET sheet is affected. SUMMARY

[0006] In order to overcome the existing deficiencies, the application provides a PET sheet with cold resistance. The cavity is supported by the auxiliary frame, the air in the cavity flows through the air hole, the volume of the air decreases when the PET sheet is in a cold environment, the pressure in the cavity decreases, the protective layer and the base layer are deformed inward under the pressure of the external air, the deformation amount is reduced, the flatness of the surface of the protective layer is ensured, and the problem that the existing PET sheet is cold shrunk in a cold environment, the internal structure of the PET sheet is unstable, and the flatness of the surface of the PET sheet is affected when the gas in the cavity expands and shrinks is solved.

[0007] The technical scheme adopted by the embodiment of the present application to solve the technical problem is:

[0008] A PET sheet with cold resistance effect, comprising a three-part structure, namely, a middle layer, two base layers and two protective layers, the middle layer is used to form an inner cavity in the PET sheet, the middle layer comprises a partition frame, and a cross frame is integrally formed in the inside of the partition frame;

[0009] The two base layers are symmetrically arranged above and below, and the two base layers seal the top and bottom of the middle layer;

[0010] The two protective layers are symmetrically arranged above and below, and the two protective layers protect the surface of the base layer;

[0011] The inside of the cross frame is provided with an auxiliary frame, the auxiliary frame comprises two cross support pieces, and air holes are formed in the inside of the two ends of the support piece.

[0012] In a possible implementation, the base layer comprises a base sheet, and the partition frame and the cross frame are fixedly installed between the two groups of base sheets to isolate the space between the two base sheets from the outside space.

[0013] In a possible implementation, the width of the cross frame is the same as the width of the partition frame, the cross frame and the support strip divide the inside of the cross frame into four cavities, and one end of the support piece is fixedly connected with the inner wall of the cavity.

[0014] In a possible implementation, the top end and the bottom end of the partition frame are fixedly connected with anti-skid strips, the anti-skid strips are recessedly connected in the inside of the base sheet, and a rib is formed on the opposite surface of the base sheet.

[0015] In a possible implementation, the outer wall and the inner wall of the top and bottom of the partition frame are fixedly connected with support strips, and the top end of the support strip is fixedly connected with a plurality of traction strips.

[0016] In a possible implementation, the base sheet is formed on the surface of the support strip, the traction strip extends into the inside of the base sheet and forms a recessed groove in the inside of the base sheet.

[0017] In a possible implementation, the top end of the traction strip is flush with the surface of the base sheet, and the traction strip is located on both sides of the rib.

[0018] In a possible implementation, the protective layer comprises a protective sheet, the protective sheet is formed on the surface of the base sheet and closely adheres to the base sheet.

[0019] In a possible implementation, the rib is recessed in the inside of the protective sheet, and a mark strip is formed on the surface of the protective sheet, and the mark strip on the top is located directly above the partition frame.

[0020] The beneficial effects of the present application are:

[0021] Firstly, in the scheme, the air inside the cavity is circulated inside the air hole by using the auxiliary frame to support in the cavity, when the PET sheet is in a cold environment, the air volume becomes smaller, the pressure inside the cavity decreases, and the deformation amount of the protective layer and the base layer under the external air pressure is reduced, which is beneficial to ensure the flatness of the surface of the protective layer.

[0022] Secondly, in the scheme, the ribs formed on the surface of the substrate make the protrusions formed inside the protective sheet fixed on the surface of the substrate, and the marking strips are formed on the surface of the protective sheet, when the surface of the protective sheet is deformed, the deformation area can be isolated by using the plurality of marking strips, the judgment of whether the surface of the PET sheet is flat or not is reduced, and the overall flatness of the PET sheet can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 is an exploded view of the present application;

[0025] Figure 3 is a schematic diagram of the structure of the auxiliary frame of the present application;

[0026] Figure 4 is a sectional view of the substrate of the present application;

[0027] Figure 5 is an enlarged schematic view of part A of the present application. Figure 4

[0028] BRIEF DESCRIPTION OF DRAWINGS: 1, protective layer; 11, protective sheet; 12, marking strip; 2, base layer; 21, substrate; 22, rib; 23, recessed groove; 3, intermediate layer; 31, support strip; 32, partition frame; 33, cross; 34, auxiliary frame; 341, air hole; 342, support sheet; 35, traction strip; 36, anti-skid strip. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the present application is to solve the problems in the above background art, and the general idea is as follows:

[0030] Embodiment 1:

[0031] This embodiment introduces a specific structure of a PET sheet with cold resistance effect, which is specifically described in the specification of the present application. Figures 1-5 ​As shown, including intermediate layer 3, two base layers 2 and two protective layers 1, the intermediate layer 3 comprises a partition frame 32, the inside of the partition frame 32 is integrally formed with a cross 33, the inside of the cross 33 is provided with an auxiliary frame 34, the auxiliary frame 34 comprises two cross-shaped support sheets 342, the inside of both ends of the support sheet 342 is processed with a breathable hole 341;

[0032] Among them, the intermediate layer 3 is used to form an inner cavity inside the PET sheet, the two base layers 2 are arranged symmetrically up and down, the two protective layers 1 are arranged symmetrically up and down, the two base layers 2 seal the top and bottom of the intermediate layer 3, and the two protective layers 1 protect the surface of the base layer 2;

[0033] Secondly, the width of the cross 33 is the same as the width of the partition frame 32, the cross 33 and the support strip 31 divide the inside of the partition frame 32 into four cavities, one end of the support sheet 342 is fixedly connected with the inner wall of the cavity, the base layer 2 comprises a base sheet 21, the surfaces of the two base sheets 21 are fixedly connected with the top and bottom ends of the partition frame 32 and the cross 33 respectively, the space between the two base sheets 21 can be isolated from the outside space, so that the air in the cavity can perform the heat preservation function;

[0034] Further, in order to reduce the shrinkage of the air in the cavity of the PET sheet in a cold environment, wrinkles appear on the surface of the surface of the protective layer 1, the two support sheets 342 are supported between the two base sheets 21, which can prevent the surface of the protective layer 1 from being concave inward, and the air in the cavity can be communicated with each other through the breathable hole 341;

[0035] In some examples, the outer wall and the inner wall of the top and the bottom of the partition frame 32 are fixedly connected with the support strip 31, and the top end of the support strip 31 is fixedly connected with a plurality of traction strips 35.

[0036] Among them, after the base sheet 21 is fixed with the partition frame 32, the base sheet 21 can be formed on the surface of the support strip 31, the traction strip 35 extends into the inside of the base sheet 21 and forms a sunken groove 23 in the inside of the base sheet 21, the sunken groove 23 and the traction strip 35 limit the base sheet 21 and the partition frame 32 from being separated from each other, which is beneficial to improve the structural strength of the partition frame 32 and the base sheet 21 after being connected;

[0037] Secondly, the top end of the traction strip 35 is flush with the surface of the base sheet 21, and the traction strip 35 is located on both sides of the rib 22, when the protective sheet 11 is processed on the surface of the base sheet 21, the surface of the protective sheet 11 can avoid being concave and uneven due to the gap between the traction strip 35 and the inner wall of the sunken groove 23, and the non-slip strip 36 can be formed on the surface of the protective sheet 11 without affecting the formation of the mark strip 12.

[0038] By adopting the above technical scheme:

[0039] The design seals the space between the partition frame 32 and the base sheet 21 by arranging the base sheet 21 on the top and bottom of the partition frame 32, divides the inside of the partition frame 32 into four cavities by arranging the cross frame 33 inside the partition frame 32, and supports the base sheet 21 between the top and bottom by the auxiliary frame 34 inside the cavities, thereby ensuring the overall structural strength of the PET sheet;

[0040] At the same time, the air inside the cavity can flow through the air holes 341 machined inside the both ends of the support sheet 342, so that the auxiliary frame 34 can flow inside the cavity on the premise of exercising the supporting function, and when the PET sheet is in a cold environment, the air volume becomes smaller, the pressure inside the cavity decreases, and the deformation amount of the protective layer 1 and the base layer 2 is reduced when the protective layer 1 and the base layer 2 are deformed due to the external air pressure, which is beneficial to the elastic reset of the protective layer 1 and the base layer 2, and at the same time reduces the wrinkle degree of the surface of the protective layer 1 and the base layer 2 after reset, which is beneficial to ensuring the flatness of the surface of the protective layer 1.

[0041] Embodiment 2:

[0042] Based on embodiment 1, this embodiment introduces the specific structure of the intermediate layer 3 and the protective layer 1, and the top and bottom of the partition frame 32 are fixedly connected with the anti-skid strips 36;

[0043] Among them, the anti-skid strips 36 are recessedly connected inside the base sheet 21, and the opposite surface of the base sheet 21 is formed with 22, which can prevent the base sheet 21 from sliding left and right relative to the partition frame 32, and at the same time, with the cooperation of the traction strip 35 and the base sheet 21, the base sheet 21 can be prevented from being disconnected with the partition frame 32;

[0044] Secondly, the protective layer 1 includes a protective sheet 11, which is formed on the surface of the base sheet 21 and closely adheres to the base sheet 21, and when the rib 22 is recessed into the protective sheet 11, the corresponding protrusion can be extruded in the protective sheet 11, so that the mark strip 12 is formed on the surface of the protective sheet 11, and at this time, the mark strip 12 on the top is located directly above the partition frame 32, and when the PET sheet is in a cold environment, the deformation of the surface of the protective sheet 11 can be prevented by the multiple mark strips 12.

[0045] The specific production and processing steps are as follows:

[0046] S1: Fix the cross frame 33 in the center of the partition frame 32, divide the inside of the partition frame 32 into four cavities by the cross frame 33, and arrange the auxiliary frame 34 inside the cavity, and make the air inside the cavity flow through the air holes 341 machined inside the both ends of the support sheet 342;

[0047] S2: processing the substrate 21 at the top and bottom of the partition frame 32, so that the substrate 21 is shaped on the surface of the support strip 31, the traction strip 35 extends into the interior of the substrate 21 and forms a recessed groove 23 in the interior of the substrate 21, and the recessed groove 23 and the traction strip 35 limit the mutual separation of the substrate 21 and the partition frame 32;

[0048] S3: extending the anti-skid strip 36 into the interior of the substrate 21, shaping the rib 22 on the surface of the substrate 21, and shaping the protrusion in the interior of the protective sheet 11 fixed on the surface of the substrate 21 by means of the rib 22, and forming the marking strip 12 on the surface of the protective sheet 11.

[0049] By adopting the above technical scheme:

[0050] The above design shapes the rib 22 on the surface of the substrate 21, shapes the protrusion in the interior of the protective sheet 11 fixed on the surface of the substrate 21, and forms the marking strip 12 on the surface of the protective sheet 11, so that when the PET sheet is in a cold environment and the surface of the protective sheet 11 deforms, the multiple marking strips 12 can be used to isolate the deformation area, avoid the contrast between multiple deformation areas after the elastic reset of the surface of the protective sheet 11, reduce the judgment of whether the surface of the PET sheet is flat, and ensure that the PET sheet is generally flat, which is simple and effective.

[0051] Finally, it should be noted that: obviously, the above examples are only examples for clearly illustrating the present application, and are not limitations on the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A PET sheet having a cold resistance effect, characterized by, Include: The intermediate layer (3) is used to form an inner cavity inside the PET sheet, and the intermediate layer (3) comprises a partition frame (32), and the inside of the partition frame (32) is integrally formed with a cross frame (33); two base layers (2) are symmetrically arranged above and below, which seal the top and bottom of the intermediate layer (3); Two protective layers (1) are symmetrically arranged above and below, which protect the surface of the base layer (2); Wherein, the inside of the cross frame (33) is provided with an auxiliary frame (34), the auxiliary frame (34) comprises two cross support sheets (342), and the inside of both ends of the support sheet (342) is provided with a breathable hole (341).

2. The PET sheet having an anti-cold effect according to claim 1, characterized by: The base layer (2) comprises a base sheet (21), and the partition frame (32) and the cross frame (33) are fixedly installed between the two groups of base sheets (21), so as to isolate the space between the two base sheets (21) from the outside space.

3. The PET sheet having an anti-cold effect according to claim 2, characterized by: The outer wall and the inner wall of the top and the bottom of the partition frame (32) are fixedly connected with a support strip (31), and the top end of the support strip (31) is fixedly connected with a plurality of traction strips (35).

4. The PET sheet having an anti-cold effect according to claim 3, characterized by: The top end and the bottom end of the partition frame (32) are fixedly connected with an anti-skid strip (36), the anti-skid strip (36) is connected in the inside of the base sheet (21), and the opposite surface of the base sheet (21) is formed with a rib (22).

5. The PET sheet having an anti-cold effect according to claim 4, characterized by: The width of the cross frame (33) is the same as the width of the partition frame (32), the cross frame (33) and the support strip (31) divide the inside of the cross frame (33) into four cavities, and one end of the support sheet (342) is fixedly connected with the inner wall of the cavity.

6. The PET sheet having an anti-cold effect according to claim 5, characterized by: The base sheet (21) is formed on the surface of the support strip (31), the traction strip (35) extends into the inside of the base sheet (21) and forms a sunken groove (23) in the inside of the base sheet (21).

7. The PET sheet having an anti-cold effect according to claim 6, characterized by: The top end of the traction strip (35) is flush with the surface of the base sheet (21), and the traction strip (35) is located on both sides of the rib (22).

8. The PET sheet having an anti-cold effect according to claim 7, characterized by: The protective layer (1) comprises a protective sheet (11), the protective sheet (11) is formed on the surface of the base sheet (21) and tightly adheres to the base sheet (21).

9. The PET sheet having an anti-cold effect according to claim 8, characterized by: The rib (22) is sunken in the inside of the protective sheet (11), and the surface of the protective sheet (11) is formed with a mark strip (12), and the top mark strip (12) is located directly above the partition frame (32).

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