Microporous laminated high-speed evaporation refrigeration garment and preparation method thereof

Abstract

A microporous laminated high-speed evaporation refrigeration garment comprises an inner layer, a water absorption layer, an evaporation high-speed moisture-permeable layer and a welding layer which are sequentially arranged from inside to outside, the welding layer is arranged on the peripheral edge of the evaporation high-speed moisture-permeable layer and the inner side partial area, the welding layer is welded to the inner layer, and a containing space is formed between the inner layer and the evaporation high-speed moisture-permeable layer. The water absorbing layer is arranged in the accommodating space; a water adding opening is further formed in the evaporation high-speed moisture permeable layer, and the water adding opening is communicated with the containing space; in addition, the evaporation high-speed moisture permeable layer is made of coating cloth or impregnated cloth with a micropore structure. In addition, the invention further discloses a preparation method of the microporous laminated high-speed evaporation refrigeration garment. According to the refrigerating garment, the structural design that the evaporation high-speed moisture-permeable layer of a micropore structure is adopted and the welding layer is arranged on the outer side is adopted, the cooling effect of the refrigerating garment is 3-5 times better than that of traditional refrigerating garments, the cooling effect is greatly improved, practicability is high, and high popularization significance is achieved.

Description

Technical Field

[0001] The invention relates to a refrigeration garment, in particular to a microporous laminated high-speed evaporation refrigeration garment and a preparation method thereof. Background Art

[0002] With the significant increase in global temperatures, summer temperatures have become hotter, bringing inconvenience to people's work and life, especially for construction workers, sanitation workers, traffic police and other outdoor workers. Without good heatstroke prevention measures, it is easy to affect the health of workers, thereby affecting work efficiency. To solve the above problems, various structures of cooling clothes are currently on the market. Water evaporation is a natural phenomenon. The process of water evaporating into steam absorbs heat and cools down. Using water evaporation to cool down the human body to make wearable products was first proposed by a British patent. There are also many domestic patents for using water evaporation to cool down cooling clothing. For example, Chinese patent CN204232340 is a cooling clothing, which includes an outer layer, a middle water-absorbing layer and an inner waterproof layer. The water in the middle water-absorbing layer will evaporate slowly at high temperature to take away heat and make the human body feel cool, with good heat dissipation effect and good comfort. Because this kind of outer layer is moisture permeable, the user experience is poor. For this reason, some cooling suits currently use a breathable, waterproof polymer film on the outer layer; the inner layer is then welded and fused with the moisture-impermeable outer layer; and the outer film is relied upon to permeate moisture and cool down.

[0003] However, this kind of outer film usually uses the hydrophilic hygroscopic principle of hydrophilic base to cool down, that is, to transfer water vapor from one side with high concentration and pressure to the other side, evaporate and dry. The prerequisite is concentration difference or pressure difference. Since the film itself has no pores, moisture permeability is mainly achieved through its water properties. Relying on the difference in vapor pressure inside and outside the clothes, the vapor is transferred from the high pressure area to the low pressure area to achieve the moisture permeability function. Its cooling effect is not good in actual use. According to the test standard ASTM E96-BW, the moisture permeability of the plastic does not exceed 4000g / m2 / 24h. It has been found that if it is under a standard atmospheric pressure, the summer ambient temperature is known to be 30℃, the water evaporation rate is 4000g / m2 / 24 hours, and the latent heat of vaporization of water is about 2428kJ / kg at 30℃. Evaporation rate 4000g / m2 / 24h converted to mass flow per second: E = 4kg / m2 / day24×3600s / day≈0.0000463kg / m2 / sEvaporation heat dissipation power: Qevap = L×E = 2428000J / kg×0.0000463kg / m2 / s≈112.4W / m2Assume that the convection heat transfer coefficient h = 25W / (m^2·℃); heat balance equation: Qevap = h×(Ta-Ts)Qevap = h×(Ta-Ts)Solving the equation, we get the temperature reduction: Ta-Ts = Qevap / h = 112.420 / 25≈4.5℃. Theoretically, the temperature can only be reduced by 4.5°C, while the actual temperature reduction is only 2 to 3℃, which cannot achieve a real cooling effect. Summary of the invention

[0004] To this end, the purpose of the present invention is to provide a microporous laminated high-speed evaporative refrigeration clothing and a preparation method thereof to solve the problems in the background technology.

[0005] To achieve the above purpose, the present invention mainly adopts the following technical solutions:

[0006] A microporous laminated high-speed evaporative refrigeration clothing, characterized in that it includes an inner layer, a water-absorbing layer, an evaporative high-speed breathable layer and a welding layer arranged in sequence from the inside to the outside, wherein the welding layer is arranged on the outer peripheral edge and the inner part of the evaporative high-speed breathable layer, wherein the welding layer in the edge area is used for outer edge sealing, and the welding layer in the inner part of the area is used for positioning the water-absorbing layer to prevent the water-absorbing layer from shifting. The welding layer is welded to the inner layer to form a containing space between the inner layer and the evaporative high-speed breathable layer, and the water-absorbing layer is arranged in the containing space; the evaporative high-speed breathable layer is also provided with a water inlet, which is connected to the containing space; in addition, the evaporative high-speed breathable layer is made of a coated fabric or a dipped fabric with a microporous structure.

[0007] Furthermore, a via group is provided at the outer edge and the inner part of the evaporation high-speed moisture permeable layer corresponding to the position of the welding layer, and the bottom surface of the welding layer passes through the via group to be welded to the inner layer.

[0008] Furthermore, the via hole group is provided with more than two rows, and the via holes in the inner and outer rows are staggered.

[0009] Furthermore, a plurality of hollow holes penetrating inside and outside are provided, and the inner layer of the edge of the hollow hole is welded to the welding layer for sealing.

[0010] Furthermore, the coating material on the evaporative high-speed moisture permeable layer is PTFE or TPU.

[0011] Furthermore, the welding layer includes a first welding layer and a second welding layer, wherein the second welding layer is arranged on the outer peripheral edge of the evaporation high-speed moisture permeable layer, and the first welding layer is arranged on the inner part of the evaporation high-speed moisture permeable layer. The second welding layer is used for sealing the outer edge, and the first welding layer is used for positioning the water absorbing layer on the inner side to prevent the water absorbing layer from shifting.

[0012] A method for preparing a microporous laminated high-speed evaporative refrigeration garment comprises the following steps:

[0013] Step 1: Cutting: cutting out the inner layer, the water absorption layer, the evaporation high-speed breathable layer and the welding layer, punching through holes in the water absorption layer, and punching a hole group at the outer edge of the evaporation high-speed breathable layer and at the position corresponding to the through holes of the water absorption layer;

[0014] Step 2: stacking: stacking the inner layer, water absorption layer, evaporation high-speed moisture permeable layer and welding layer on the mold from bottom to top and accurately positioning them on the mold;

[0015] Step 3: welding, using welding equipment to weld the stacked fabric layers, so that part of the bottom surface of the welding layer passes through the via group and is fused and connected with the inner layer; part of the bottom surface area of ​​the welding layer passes through the via group and the through hole of the water absorption layer and is fused and connected with the inner layer;

[0016] Step 4: Remove the excess welding layer and remove the excess part on the outside of the welding layer.

[0017] Furthermore, a step of processing hollow holes is included between step three and step four; in step one, the welding layer is a whole piece structure, through holes are first processed on the water absorption layer, and a via group is processed on the evaporation high-speed moisture permeable layer corresponding to the through hole position, and in step three, the bottom surface of the welding layer passes through the via group and the through hole and is welded to the inner layer; and then a hollow hole that passes through the inside and outside is processed corresponding to the through hole position after welding.

[0018] Furthermore, a welding area and a non-welding area are provided on the welding layer, and a process line is provided between the welding area and the non-welding area; the welding area is provided corresponding to the via group; in step four, the welding layer of the non-welding area is removed along the process line.

[0019] Furthermore, the process line is composed of a plurality of spaced through holes, and the non-welding area can be torn off along the process line.

[0020] In summary, the present invention is provided with an ice silk inner layer with good thermal conductivity, a middle water-absorbing layer with good water absorption, and an evaporation high-speed moisture-permeable layer with good air permeability. The evaporation high-speed moisture-permeable layer adopts a coated fabric or a dipped fabric with a microporous structure, so that the fabric can maintain waterproofness and can be highly moisture-permeable, allowing water vapor to be directly discharged to the outside through the film micropores; the evaporation high-speed moisture-permeable layer is directly exposed to the air by welding the small area welding layer to the inner layer, and the moisture in the water-absorbing layer is converted into water vapor and evaporated from the evaporation high-speed moisture-permeable layer at a high speed, while absorbing a large amount of heat, thereby reducing the temperature to the maximum extent, and conducting the cold source to the skin through the inner layer of ice silk, thereby achieving a good cooling effect on the human body. The present invention is highly practical and has a strong promotional significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 and Figure 2 It is a schematic diagram of the front and back structures of the finished product of the microporous laminated high-speed evaporative refrigeration clothing of the present invention;

[0022] Figure 3 and Figure 4 for Figure 1 Schematic diagram of the press-fit welding of the front and rear areas of the mid-cooling suit;

[0023] Figure 5 for Figure 1 A schematic diagram of the cross-sectional structure of the preparation process of the refrigeration zone in FIG.

[0024] Figure 6 for Figure 5 One of the schematic diagrams of the structure of each layer in the middle front area;

[0025] Figure 7 for Figure 1 Another implementation structure in;

[0026] Figure 8 and Fig. 9 Schematic diagram of two different styles: short sleeves and long sleeves. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] like Figures 1 to 6As shown, it is a first embodiment of a microporous laminated high-speed evaporative refrigeration clothing provided by the present invention. In this embodiment, the microporous laminated high-speed evaporative refrigeration clothing is a vest type, such as Figure 8 , Fig. 9 As shown, it can also be a short-sleeved, long-sleeved style, or other wearing styles, and the specific style is not limited here.

[0029] The microporous laminated high-speed evaporative refrigeration clothing includes a back area and two front areas. In this embodiment, the two front areas are connected to the back area through a cloth layer 80. The front area and the back area are both provided with a refrigeration zone, and the refrigeration zone includes an inner layer 10, a water absorption layer 20, an evaporation high-speed breathable layer 30 and a welding layer 40 arranged in sequence from the inside to the outside. The water absorption layer 20 is arranged between the inner layer 10 and the evaporation high-speed breathable layer 30, and the welding layer 40 is arranged outside the evaporation high-speed breathable layer 30, and the welding layer 40 is welded to the inner layer 40, so that a closed accommodation space is formed between the inner layer 10 and the evaporation high-speed breathable layer 30. In addition, the refrigeration zone is also provided with a plurality of hollow holes 60 that penetrate inside and outside, and the edges of the hollow holes 60 are welded by the inner layer 10 and the welding layer 40 for sealing. The design of the hollow holes 60 can keep the clothes transparent inside and outside.

[0030] In this embodiment, the inner layer 10 is a composite cloth, which includes an inner cloth layer 11 and an outer moisture-impermeable film 12, and the moisture-impermeable film 12 is composited on the cloth layer 11. More specifically, the cloth layer 11 is ice silk cloth, and the moisture-impermeable film 12 is a TPU waterproof film. Among them, the ice silk cloth has good thermal conductivity and can quickly absorb body heat. The TPU waterproof film can prevent moisture from contacting the skin, and it can be fused with the welding layer 40 and seal the moisture in a certain interval. It should be noted that the cloth layer 11 and the moisture-impermeable film 12 can also be other materials that can achieve the same effect, and are not limited to the ice silk cloth and TPU waterproof film mentioned above.

[0031] The material of the water-absorbing layer 20 is a water-absorbing material. In this embodiment, the water-absorbing layer 20 is SAF super absorbent cotton or PVA water-absorbing cloth; it can absorb water several dozen times its own weight, and lock the water with the support force after the welding layer 40 and the inner layer 10 are fused, so that the water is evenly distributed in all parts of the clothes. It can be understood that in other embodiments, the water-absorbing layer 20 can also be other water-absorbing materials, and is not limited to the examples in this embodiment. In this embodiment, the water-absorbing layer 20 is provided with a through hole 21 at the position corresponding to the hollow hole 60.

[0032] The evaporative high-speed moisture permeable layer 30 is a fabric that can block liquid water while allowing water vapor to pass through. It can be a coated fabric or a dipped fabric with a microporous structure, which allows the fabric to maintain waterproofness while being able to quickly permeate moisture, allowing water vapor to directly pass through the film micropores to the outside. The coated fabric is polyester fabric or nylon fabric or other fabric, and its coating is 0.005mm to 0.03mm PTFE or TPU.

[0033] The pore size of the micropores of the coated fabric used in this embodiment can reach between 100 and 500 nanometers under the control of the stretching ratio, and the porosity can reach more than 85%. The diameter of a water vapor molecule is 0.0004 micrometers, while the diameter of the light mist with a small diameter in rainwater is 20 micrometers, and the diameter of drizzle is as high as 400 micrometers. The size of the micropores is only one ten-thousandth of the smallest water droplet, but they are about 700 times larger than the volume of a unit water molecule. Therefore, the microporous membrane can allow water vapor to pass directly through the micropores of the film to the outside world while being waterproof. In addition, this embodiment uses a coated fabric or a dipped fabric with a microporous structure to maximize the moisture permeability of the fabric. The theoretical moisture permeability of the microporous structure coated fabric can reach 12000g / m2 / 24h. The theoretical calculation is as follows: If it is under a standard atmospheric pressure, it is known that the summer ambient temperature is set to 30°C, the water evaporation rate is 12000 grams / square meter / 24 hours, and the latent heat of vaporization of water is about 2428kJ / kg at 30°C. Evaporation rate 12000 g / m2 / 24 hours converted to mass flow per second: E = 12 kg / m2 / day24 × 3600 s / day ≈ 0.0001389 kg / m2 / sEvaporation heat dissipation power: Qevap = L × E = 2428000 J / kg ×

[0034] 0.0001389kg / m2 / s≈337.2W / m2Assume that the convection heat transfer coefficient is h=25W / (m^2·℃); Heat balance equation: Qevap=h×(Ta-Ts)Qevap=h×(Ta-Ts)Solving the equation, we get the lowered temperature: Ta-Ts

[0035] =Qevap / h=337.2 / 25≈13.5℃. As can be seen from the above, the temperature can be reduced by 13.5℃ in theory, and the actual temperature reduction is also above 8℃, which is much better than the cooling effect of traditional cooling clothes.

[0036] A via group is provided on the evaporation high-speed moisture permeable layer 30 at a position corresponding to the through hole 21 of the water absorbing layer 20, and the via group includes a plurality of vias 32. In this embodiment, there are more than two via groups, and the vias 32 on the inner and outer sides are staggered. In addition, a via group is also provided at the edge of the evaporation high-speed moisture permeable layer 30, and the via group is distributed along the edge. In this embodiment, there are more than two rows of via groups arranged inside and outside, and the vias 32 on the inner and outer sides are staggered.

[0037] The evaporation high-speed moisture permeable layer 30 is also provided with a water inlet 33, and a sealable sealing strip or zipper is provided on the water inlet 33. In this embodiment, three water inlets 33 are provided, which are respectively located on the back area and the two front areas.

[0038] The welding layer 40 is a thermoplastic material with good weldability and can be welded with the inner layer 10. In this embodiment, the material of the welding layer 40 is TPU film or TPU composite cloth. It can be understood that the welding layer 40 can also be other film materials with the same function. The welding layer 40 includes a first welding layer 41 and a second welding layer 42. In this embodiment, the first welding layer 41 is arranged in an annular shape, and the second welding layer 42 is arranged in a strip shape. The first welding layer 41 is arranged at the corresponding position of the hollow hole 60, and the second welding layer 42 is arranged at the outer edge sealing position. In addition, when it is not necessary to open the hollow hole 60 in other embodiments, the first welding layer 41 is a circular or other non-annular structure, which is used to weld with the inner layer and position the water absorbing layer 20 to avoid displacement of the water absorbing layer 20.

[0039] The inner layer 10, the water absorption layer 20, the evaporation high-speed moisture permeable layer 30 and the welding layer 40 are stacked in sequence from bottom to top and accurately positioned, and the bottom surface of the first welding layer 41 passes through the through hole 32 of the evaporation high-speed moisture permeable layer 30 and is welded and fused with the inner layer 10, and the bottom surface of the second welding layer 42 is welded and fused with the inner layer 10 through the through hole 32 on the side of the evaporation high-speed moisture permeable layer 30. The second welding layer 42 is also welded and fused with the inner layer 10 extending outside the evaporation high-speed moisture permeable layer 30 to form a closed area, and the second welding layer outside the closed area can be connected to other fabric layers. In this embodiment, the welding layer 40 is only provided at the connection with the inner layer 10, so that the evaporation high-speed moisture permeable layer 30 is exposed to the air, and high-speed water evaporation is performed to the maximum extent, thereby achieving the best cooling effect.

[0040] like Figure 7 As shown, the sides of the back area and the front area can also be connected by a connecting buckle 70, and the connecting buckle 70 is a conventional adjustable buckle. The connecting buckle 70 includes a bayonet end and an insertion end, and the bayonet end and the insertion end are respectively arranged on the sides of the back area and the front area, and the insertion end is embedded in the bayonet end. The user can connect the back and the front side through the connecting buckle, and can adjust the tightness, so that the scope of application is wider. In addition, a fan (not shown) can also be arranged on the microporous laminated high-speed evaporative refrigeration suit, and the air outlet of the fan corresponds to between the skin and the inner layer 10 to blow away the sweat on the skin. Further, the fan is arranged on the back of the refrigeration suit, and more preferably, two fans are arranged, respectively located on the two side areas below the back.

[0041] In addition, the present invention also discloses a method for preparing a microporous laminated high-speed evaporative refrigeration clothing, which specifically comprises the following steps:

[0042] Step 1: cutting, cutting out the inner layer 10, the water absorption layer 20, the evaporation high-speed moisture permeable layer 30 and the whole piece welding layer 40a, and punching holes 21 on the water absorption layer 20, punching a hole group 32 on the evaporation high-speed moisture permeable layer 30, setting a welding area 41a and a non-welding area 42a on the welding layer 40a, and separating the welding area 41a from the non-welding area 42a by a process line 43a, wherein the welding area 41a is set corresponding to the hole group 32, and the width dimension is slightly larger than the area where the hole group 32 is set. In this embodiment, the process line is formed by a plurality of spaced holes to form an easy-tear line, and after welding is completed, the excess welding layer can be easily removed through the process line.

[0043] Step 2: stacking: stack the inner layer 10, the water absorbing layer 20, the evaporation high-speed moisture permeable layer 30 and the welding layer 40 in sequence from bottom to top and accurately position them on the mold.

[0044] Step 3: welding: welding the stacked fabric layers using welding equipment, so that the welding layer 40a is fused and connected with the inner layer 10 through the via group 32. In this embodiment, the welding equipment may be a high-frequency welding machine. It is understandable that in other embodiments, it may also be an existing conventional equipment such as an ultrasonic welding machine, a hot press welding machine, etc.

[0045] Step 4: Remove the non-welding area 42a, and remove the welding layer 40a of the non-welding area 42a along the process line 43a to expose the evaporation high-speed moisture permeable layer 30.

[0046] Step 5: Open the hollow hole 60, and open the hollow hole 60 at the position corresponding to the hollow hole 60 after welding. In this embodiment, in order to facilitate processing and reduce processing costs, the hollow hole 60 is processed after welding. It can be understood that in other embodiments, holes can be opened first on all layers corresponding to the position of the hollow hole 60, and then aligned welding can be performed.

[0047] Step 6: Post-processing: seal the edges of the clothes or connect the parts to form a complete garment according to the style requirements.

[0048] In summary, the present invention is provided with an ice silk inner layer with good thermal conductivity, a middle water-absorbing layer with good water absorption, and an evaporation high-speed moisture permeable layer 30 with good air permeability. The evaporation high-speed moisture permeable layer 30 is welded to the inner layer 10 through a small area welding layer 40, so that a space for accommodating the water-absorbing layer 20 is formed between the evaporation high-speed moisture permeable layer 30 and the inner layer 10. The moisture in the water-absorbing layer 20 is converted into water vapor and evaporates at a high speed from the evaporation high-speed moisture permeable layer 30, while absorbing a large amount of heat, thereby minimizing the temperature, and conducting the cold source to the skin through the inner layer of ice silk, thereby achieving a good cooling effect on the human body. The evaporation high-speed moisture permeable layer 30 of the present invention adopts a breathable and moisture-impermeable fabric with micropores, so that the cooling effect of the refrigeration clothing is 3-5 times better than that of the traditional structure, greatly improving the cooling effect. The present invention is highly practical and has a strong promotional significance.

[0049] The above descriptions are only some of the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A microporous laminated high-speed evaporative refrigeration clothing, characterized in that: The invention comprises an inner layer, a water absorption layer, an evaporation high-speed breathable layer and a welding layer which are sequentially arranged from the inside to the outside. The welding layer is arranged on the outer peripheral edge and the inner part of the evaporation high-speed breathable layer. The welding layer is welded to the inner layer to form a containing space between the inner layer and the evaporation high-speed breathable layer. The water absorption layer is arranged in the containing space. A water inlet is also arranged on the evaporation high-speed breathable layer, and the water inlet is connected to the containing space. In addition, the evaporation high-speed breathable layer is made of a coated cloth or a dipped cloth with a microporous structure.

2. The microporous laminated high-speed evaporative refrigeration clothing according to claim 1, characterized in that: A via group is arranged at the outer edge and the inner part of the evaporation high-speed moisture permeable layer corresponding to the position of the welding layer, and the bottom surface of the welding layer passes through the via group and is welded to the inner layer.

3. The microporous laminated high-speed evaporative refrigeration clothing according to claim 2, characterized in that: The via hole group is provided with more than two rows, and the via holes in the inner and outer rows are staggered.

4. The microporous laminated high-speed evaporative refrigeration clothing according to claim 1, characterized in that: A plurality of hollow holes penetrating inside and outside are also provided, and the inner layer of the edge of the hollow hole is welded to the welding layer for sealing.

5. The microporous laminated high-speed evaporative refrigeration clothing according to claim 1, characterized in that: The coating material on the evaporation high-speed moisture permeable layer is PTFE or TPU.

6. The microporous laminated high-speed evaporative refrigeration clothing according to claim 1, characterized in that: The welding layer comprises a first welding layer and a second welding layer, wherein the second welding layer is arranged on the outer peripheral edge of the evaporation high-speed moisture permeable layer, and the first welding layer is arranged on the inner part of the evaporation high-speed moisture permeable layer.

7. A method for preparing a microporous laminated high-speed evaporative refrigeration garment, characterized in that: The steps include: Step 1: Cutting: cutting out the inner layer, the water absorption layer, the evaporation high-speed breathable layer and the welding layer, punching through holes in the water absorption layer, and punching a hole group at the outer edge of the evaporation high-speed breathable layer and at the position corresponding to the through holes of the water absorption layer; Step 2: stacking the inner layer, the water absorption layer, the evaporation high-speed moisture permeable layer and the welding layer on the mold in sequence from bottom to top; Step 3: welding, using welding equipment to weld the stacked fabric layers, so that part of the bottom surface of the welding layer passes through the via group and is fused and connected with the inner layer; part of the bottom surface area of ​​the welding layer passes through the via group and the through hole of the water absorption layer and is fused and connected with the inner layer; Step 4: Remove the excess welding layer and remove the excess part on the outside of the welding layer.

8. The method for preparing the microporous laminated high-speed evaporative refrigeration clothing according to claim 7, characterized in that: A step of processing hollow holes is also included between step three and step four; in step one, the welding layer is a whole piece structure, through holes are first processed on the water absorption layer, and a through hole group is processed on the evaporation high-speed moisture permeable layer corresponding to the through hole position, and in step three, the bottom surface of the welding layer passes through the hole group and the through hole and is welded to the corresponding inner layer; and then a hollow hole that penetrates inside and outside is processed at the corresponding through hole position after welding.

9. The method for preparing the microporous laminated high-speed evaporative refrigeration clothing according to claim 7, characterized in that: The welding layer is provided with a welding area and a non-welding area, and a process line is provided between the welding area and the non-welding area; the welding area is provided corresponding to the via group; in step four, the welding layer of the non-welding area is removed along the process line.

10. The method for preparing the microporous laminated high-speed evaporative refrigeration clothing according to claim 9, characterized in that: The process line is composed of a plurality of spaced through holes, and the non-welding area can be torn off along the process line.

Images