I tried to get image for invoice email template. I used below code. Just i'm getting magento placeholder image in email template.

<td>
        <?php 
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        $product_id = $_item->getOrderItem()->getProduct();
        $product = $objectManager->get('Magento\Catalog\Model\Product')->load($product_id);

        $_imagehelper = $objectManager->get('Magento\Catalog\Helper\Image');
        $image_url = $_imagehelper->init($product, 'cart_page_product_thumbnail')->getUrl();

        ?>
          <img src="<?php echo $image_url; ?>" alt="<?php echo $product->getName(); ?>" />
    </td>

Please help to solve this solution.

Thank you.

I am trying to get product images for invoice email template. I used below code. But I am only getting Magento placeholder image in email template.

<td>
    <?php 
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $product_id = $_item->getOrderItem()->getProduct();
    $product = $objectManager->get('Magento\Catalog\Model\Product')->load($product_id);

    $_imagehelper = $objectManager->get('Magento\Catalog\Helper\Image');
    $image_url = $_imagehelper->init($product, 'cart_page_product_thumbnail')->getUrl();

    ?>
      <img src="<?php echo $image_url; ?>" alt="<?php echo $product->getName(); ?>" />
</td>