Temperature-resistant plastic round bars

Abstract

A heat-resistant plastic round strip consists of a soft inner core (1) and a rigid outer layer (2). The soft inner core and the rigid outer layer are co-extruded into concentric round strips using two extruders. The soft inner core and the rigid outer layer can be made of PVC (polyvinyl chloride) plastic. The Shore hardness of the soft inner core is 50-85 HA (at room temperature). The Shore hardness of the rigid outer layer is 75-105 HA (at room temperature). The clip made of the heat-resistant plastic round strip will not soften and be pulled out of the frame's slot at the highest operating temperature (air temperature 40 degrees Celsius, direct sunlight), ensuring safe use.

Description

Technical Field

[0001] This utility model relates to a heat-resistant plastic round strip for use with clips. The heat-resistant plastic round strip is a plastic extrusion product, mainly used for connecting the edges of tent and membrane structure tarpaulins. It belongs to the field of tent manufacturing. Background Technology

[0002] Existing large tents and membrane structure houses all use a structure where the perimeter is connected to the frame using clips. A clip is a strip-shaped connector made of plastic round bars wrapped with tent fabric and heat-sealed together, fused to the edge of the tent fabric to connect the tent fabric and the frame. In current technology, due to price considerations, the plastic round bars are generally made of PVC (polyvinyl chloride). Due to usage requirements, soft PVC is used for these plastic round bars. Because of the environmental limitations of tents and membrane structure houses, in hot summers, the plastic round bars inside the clips soften due to sunlight and ambient temperature. When the temperature is very high, the clips, due to the softening of the plastic round bars, can be pulled out of their slots in the frame, causing the tent fabric and frame to separate. This seriously affects the safety of using tents and membrane structure houses. Currently, there is no good solution to this problem. Summary of the Invention

[0003] The purpose of this invention is to design a heat-resistant plastic round strip to ensure that the strip will not be pulled out of the frame's slot due to softening in hot environments, thus preventing the tarpaulin from separating from the frame.

[0004] Technical solution: To achieve the above-mentioned utility model objective, the following technical solution is adopted: Two plastics with different hardness are made into concentric circular strips, with a soft inner core and a hard outer layer, thus forming a heat-resistant plastic circular strip.

[0005] The Shore hardness of the soft inner core is 50-85HA (at room temperature).

[0006] The Shore hardness of the hard outer layer is 75-105 HA (at room temperature).

[0007] This utility model has the following advantages: because the heat-resistant plastic round strip has a hard outer layer that does not soften at high temperatures, the clip will not be pulled out of the slot of the frame due to the softening of the plastic round strip, thus ensuring safe use; because the outer layer material of the heat-resistant plastic round strip has the same melting temperature as the original PVC material round strip material, it does not change the bonding temperature between the clip and the fabric during the production of the clip. Attached Figure Description

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0009] Appendix Figure 1 This is a cross-sectional view of the temperature-resistant plastic round bar of this utility model.

[0010] In the diagram: 1. Soft inner core, 2. Hard outer layer. Detailed Implementation

[0011] The present invention will be further illustrated by the following embodiments.

[0012] Example: A heat-resistant plastic round bar consists of a soft inner core (1) and a rigid outer layer (2). In this embodiment, the soft inner core (1) and the rigid outer layer (2) are made of PVC (polyvinyl chloride) plastic. The heat-resistant plastic round bar, consisting of the soft inner core (1) and the rigid outer layer (2), is produced by co-extrusion using two extruders. The soft inner core (1) has a Shore hardness of 65-75 HA (room temperature); the rigid outer layer (2) has a Shore hardness of 85-95 HA (room temperature). The clip made of the heat-resistant plastic round bar will not soften and be pulled out of the slot of the frame at the highest operating temperature (air temperature 40 degrees Celsius, direct sunlight).

[0013] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. All equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and concept of this utility model, should be covered within the protection scope of this utility model.

Claims

1. A heat-resistant plastic round bar, made of two plastic materials with different hardness, characterized in that... The concentric strip is made of two types of plastic, a soft inner core and a hard outer layer.

2. The temperature resistant plastic round rod according to claim 1, wherein The soft inner core has a Shore hardness of 50-85 HA (room temperature environment).

3. The temperature resistant plastic round rod according to claim 1, wherein The hard outer layer has a Shore hardness of 75-105 HA (room temperature environment).

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